Crossrail: A technical guide for developers |
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Contents 1
Introduc on
05
2
General Informa on about Crossrail assets
06
3
Engagement with Crossrail
07
4
Crossrail’s Standard Condi ons
11
5
Considera ons for complex development close to Crossrail assets completed or under Construc on
12
6
Noise and Vibra on
18
Appendix A Noise and Vibra on Assessment Summary
21
Appendix B Dra Monitoring Agreement (of CRL Assets)
31
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| Crossrail: A technical guide for developers
Varies
Exclusion zone 6.5m
3.5m
7m Crossrail running tunnel
3.5m
Figure 1 Crossrail Exclusion and Tolerance Zones
3.5m
Crossrail: A technical guide for developers |
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1 IntroducƟon 1.1
Crossrail is being constructed using powers granted by an Act of Parliament dated 2008. The route remains safeguarded under Direc ons issued by the Secretary of State for Transport to preserve the integrity of the railway assets into the future. Crossrail is being delivered by Crossrail Limited (CRL). CRL has the obliga on to ensure that the railway assets being built are properly cared for and in a fit state of order to deliver their func onal requirements upon comple on and handover to the railway operators. Crossrail’s design life is 120 years which is considerably longer than the planned lifespan of typical commercial, retail and residen al development and so Crossrail Safeguarding seeks to protect the railway both in the short term during its construc on and against possible risks long into the future. At the same me Crossrail recognises the significance of growth and regenera on catalysed by the railway construc on and it is the Safeguarding team’s policy to provide Safeguarding guidance to developers to help them realise their ambi ons without adversely affec ng the railway as far as reasonably possible.
1.2
The Safeguarding process requires local authori es to consult Crossrail Ltd (CRL) before determining planning applica ons that fall within certain limits of consulta on. This is to ensure that future developments do not create adverse impact on the tunnels or other underground infrastructure.1.3 The applicant/developer must be able to demonstrate to CRL that the founda ons of new development proposals do not adversely impact on Crossrail assets. New developments therefore should be designed to mi gate the possible effects of ground movement on the tunnels and other Crossrail infrastructure. New developments should also be resilient to the impact of ground-borne noise and vibra on caused by the opera ng railway
1.4
As part of the consulta on process, CRL can:a)
recommend that the Local Planning Authority (LPA) place condi ons on a planning permission which must be complied with/discharged before construc on of the approved development can commence on site, or;
b)
recommend that the LPA refuse the applica on.
1.5
In order to assist developers to design buildings to meet these objec ves, and to avoid the possibility of a recommenda on of refusal being made to the LPA, key informa on about Crossrail design criteria is set out in this document.
1.6
This document provides technical guidance to developers wishing to undertake works close to railway assets. It describes:
1.7
a)
the Planning condi ons that may typically be applied to safeguard the railway;
b)
the process for consulta on with Crossrail;
c)
details to be included in submission to demonstrate achievement of safeguarding;
d)
the most significant development interface risks and issues that might need to be managed during the development construc on;
e)
railway asset serviceability compliance criteria which should be adhered to;
f)
suitable methods for the assessment of transmission of groundborne noise & vibra on that may impact development
In this document the term Developer is used in a generic sense and refers to all par es involved in delivering development and who may be accountable or responsible for safeguarding Crossrail assets within the zone of influence of development works.
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| Crossrail: A technical guide for developers
2 General informaƟon about Crossrail assets 2.1
The outside diameter of the Crossrail running tunnels should be taken as 7.0m (see Figure 1 on page 4 ) The diameter of sta on and other tunnels such as cross passages, sha adits and crossovers, varies. The Developer should ask CRL’s Third Party Development Manager for further advice on this issue.
2.2
Crossrail box structures These include deep box sha s, cket halls, basements and box sta ons (e.g. Paddington sta on). Developers must consider the impact of their proposals on the structural integrity and long term operability of these assets. The Developer should seek advice from CRL’s Third Party Development Manager regarding the par cular constraints imposed by these structures.
2.3
Crossrail Design Life The railway is designed to achieve a 120 year design life which may well exceed the design life of building projects and thus the railway may see several development itera ons during its existence. Developers’ designs must also consider and demonstrate that the integrity and operability Crossrail assets will not be compromised as a consequence of future demoli on of the development.
2.4
Tunnel exclusion zone Developers should note that an exclusion zone exists around the tunnels (see Figure 1 on page 4) and founda ons or temporary works may not encroach into the Exclusion Zone unless otherwise agreed with CRL. The Developer must also make adequate allowance for the construc on tolerance of the proposed development founda ons in determining their proximity to the Crossrail tunnels. If there are constraints which prevent these limits being met, advice should be sought from CRL’s Third Party Development Manager. If a developer has entered into a separate development agreement with Crossrail, then the terms contained within that development agreement take precedence over this document.
2.5
Loads from development founda ons Development founda ons must be designed so that stresses induced in the Crossrail tunnel linings do not exceed acceptable levels. In general, this will be achieved if the overall loading imposed on the tunnels:
2.6
a)
does not exceed the exis ng ground overburden plus the loading from any exis ng development (as would be the case for redevelopment of an exis ng site), or;
b)
does not exceed the exis ng ground overburden plus 50kN/m2 imposed at ground level over the footprint of the development (as would be the case in development of a vacant site). The CRL tunnels have been designed to account for exis ng loads.
The Developer will be required to demonstrate that the impact of a construc on on Crossrail is acceptable and to cover any costs incurred by CRL in rela on to assessment of ’submissions to prove safeguarding of assets, instrumenta on, monitoring, con ngency plans and a endance at mee ngs.
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3 Engagement with Crossrail 3.1
The Developer is advised to consult CRL prior to submission for Planning, to maximise opportunity for understanding and considera on of project interface constraints and opportuni es, and the condi ons which Crossrail may seek to impose on development.
3.2
Crossrail’s principal point of contact is:
[email protected]
3.3
Alterna vely Crossrail can be contacted through its Helpdesk (contact number: 08345 602 3813). The Developer may then request consulta on with Crossrail’s Third Party Development Manager.
3.4
Crossrail expects developers to submit evidence demonstra ng their compliance with the requirements of this document and any relevant planning condi ons. Suitable evidence will enable Crossrail to issue a le er of no objec on to the planning authority endorsing acceptance for planning purposes.
3.5
The Developer is expected to enter into an agreement with CRL whereby it accepts that disclosure of released informa on regarding Crossrail assets close to development sites is con ngent on CRL’s receipt of wri en request and confirma on of the Developer’s acceptance of Crossrail’s terms and condi ons governing issue of informa on.
3.6
Crossrail reserves the right to charge developers for me and resource u lised in assessing development proposals, par cularly where specialist engineering resources have to be commissioned to advise. If charges are an cipated then these will be advised to the Developer beforehand. The Developer will be expected to provide its invoicing instruc ons and a commitment to reimburse Crossrail before costs are expended.
3.7
Submissions submi ed during the advancing stages of the development project should be structured to demonstrate progressive assurance, i.e. demonstra ng that the Crossrail Safeguarding objec ves set will be achieved and that the project can progress successfully to the next stage. A list of key deliverable components to meet Safeguarding compliance requirements is presented in Sec on 3.8. It is envisaged that components might principally be bound into submissions for the key project development stages, thus: • • •
A Conceptual design Submission A Detailed design (issue for construc on) Submission A Comple on (as-built) Submission
It is envisaged that submissions will also a)
b)
set out the compliance objec ves to be met to ensure that the development will not unduly affect Crossrail infrastructure; provide a stand-alone overview of the development interface, describing: • • •
d)
The scope of redevelopment and end use Proximity in respect of Crossrail; Narra ve to iden fy the key interface considera ons and assump ons;
include details of company names, registered addresses and key project personnel and contact details, for • • • • •
The Development Client; Structural and Geotechnical Engineers; Architect; Project Manager Contractor (Demoli on and Main Works Contracts and Ground Inves ga on Contractor
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| Crossrail: A technical guide for developers
e)
outline Project Programme including key milestones dates (accuracy commensurate with knowledge at planning stage of development);
f)
include Standards and References used.
Key Crossrail-Development interface deliverable components to demonstrate Safeguarding of CRL assets (also refer to Sec on 5 for further guidance on content of submissions)
Development PRE-PLANNING RIBA Phase Stage 1-3 Development to Concept Design Compliance Criteria
POST-PLANNING RIBA Stage 4 Technical Design (Final Design for ConstrucƟon Submission)
CONSTRUCTION RIBA Stage 5
COMPLETION RIBA Stage 6-7 Handover & Close Out
A.2.1 Detail Design amendments Statement and General Arrangement drawing plans & sec ons relating the spa al envelope of development to the posi on of Crossrail
A.3.1 Contractor’s Design spa al envelope amendments, including designed pile toe levels and pile posi ons to OS grid coordinates
A.4.1 As-built foundaon design details: pile grid coordinates and pile toe levels, rela ve to OS grid coordinates
Prelimin A
Evidence of Spa al Compliance (avoidance of Crossrail Exclusion Zone (Crossrail Line 1), and Tolerance Zone (Crossrail Line 2)
A.1.1 Concept Design Statement including General Arrangement drawing plans & sec ons rela ng the spa al envelope of development to the posi on of Crossrail
A.3.2 Method statements and details of site inves ga ons to prove the geology, demonstra ng considera on of loca on of Crossrail buried assets. B
C
Evidence that Surcharge Loading or transferred pile loads imposed on Crossrail assets is < 50kPa,
Evidence of Compliance with Crossrail Policy on mi ga on of Groundborne Noise & Vibra on
B.1.1 Concept Design Design load analysis report including schedule of founda on design loads and calcula ons before and a er development, demonstra ng compliance
C.1.1 Concept Design Groundborne N&V assessment report
B. 2.1 Detailed Design amendments report including schedule of founda on design loads and calcula ons demonstra ng compliance
B.3.1 Contractor’s B.4.1 Ou urn stateDesign amendments re- ment of confirmaon of adherence to port including schedule of revised founda on designed loads design loads and calcula ons, maintaining compliance
B.2.2 Category 2 or 3* Check Cer ficate verifying founda on design loads
B.3.2 Category 2 or 3* Check Cer ficate verifying founda on design loads
* level of prescribed check is dependent on severity of interface risk
* level of prescribed check is dependent on severity of interface risk
C.2.1 Designer’s Groundborne N&V assessment and design of mi ga on measures (if assump ons differ from Concept Design)
C.3.1 Evidence, if required, of assurance that any designed Groundborne N&V mi ga on measures have been constructed in accordance with specified requirements
Crossrail: A technical guide for developers |
D
Construc on Interface Management and Mi ga on of Concurrent 3rd Party Impacts
D.2.1 Evidence that Developer’s collocated works causing se lement are not scheduled concurrently with Crossrail works causing ground movement, se lement impact , that might have a compounded impact on 3rd party assets. If works concurrency is schedules are unavoidable then evidence of measures enforced to control sources of settlement D.2.2 Agreement to enter into shared access or shared workspace agreement or protocol to help mi gate Health & Safety and logis cal risks
E
Crossrail Se lement impact on Development < Damage Cat 2
D.1.3. Dra Construcon Logis cs Plan or Design & Access Statement
D.2.3. Updated Dra Construc on Logis cs Plan or Design & Access Statement
D.3.3. Updated Construc on Logis cs Plan, if significantly amended.
D.1.4 Dra Development Implementa on Programme
D.2.4 Updated Development Implementaon Programme
D.3.4 Updated Development Implementaon Programme
D.2.5 [where 3rd Par es’ assets are impacted by compounded ground movement from Development and Crossrail] Evidence of 3rd Par es’ acceptance of Developer’s assessment and mi ga on for compounded impact on assets.
D.3.5 If applicable, documented confirmaon of agreements to mi gate possible disturbance / damage to Crossrail monitoring equipment
E.1 Checked Dra Ground Movement Structural Impact Assessment to prove that predicted se lement impact from construcon of Crossrail < Damage Category 2, as defined in Crossrail Paper D12.
E.2 Final Ground Movement Structural Impact Assessment to prove that predicted se lement impact from construc on of Crossrail < Category 2
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F
| Crossrail: A technical guide for developers
Se lement impact from Development acceptable to Crossrail
F.1.1 Checked * Dra Ground Movement Impact Assessment, including details of technical assump ons to prove that predicted se lement impact on Crossrail assets from construc on of Development does not exceed prescribed asset and systems performance acceptance criteria. Include references, standards and guidelines used
F.2.1 Checked * Final Design Ground Movement Impact Assessment (aligned with Contractor’s installa on method statements) to prove that predicted se lement impact on Crossrail assets from construc on of Development does not exceed prescribed asset and systems performance acceptance criteria.
F.3.1 Checked Contractors’ Construc on Method statements demonstra ng compliance with se lement and vibra on acceptance requirements Contractor’s method statements Ground Inves ga ons planned near to Crossrail assets
Include details of GI undertaken to support assump ons. Include details of construc on sequences Include references, standards and guidelines used F.2.2 Category 2 or 3* Check Cer ficate for GMIA
F.3.2 Category 2 or 3* Check Cer ficate for GMIA
* level of prescribed check is dependent on severity of interface risk
* level of prescribed check is dependent on severity of interface risk
F.2.3 Monitoring Agreement F.1.4 Dra Tunnel Monitoring Plan, if necessary for control of ground movement impact on Crossrail assets
F.2.4 Updated Monitoring Plan
F.2.5. Developers Monitoring Plan (Reference Design) F.2.6 Monitoring Ac on Plan F.3.7 Monitoring Results Interpre ve Reports F.3.8 ERM and EERM Mee ng minutes F.4.9 Post-construc on CRL asset survey
F.2.9 Pre-commencement CRL asset condion survey G
Project Interface Coordina on & Risk Mi ga on
G.1.1 Design & Planning Interface Coordina on Mee ng Notes
G.2.1 Design & Planning Interface Coordina on Mee ng Notes
G.3.1 Construc on Interface Coordina on Mee ng Notes and Site Inspec on Notes
G.1.2 Interface Risk Register
G2.2 Updated Interface Risk Register
G.3.2 Updated Interface Risk Register
G.4.2 Close-out Interface Residual Risk Register
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H
Miscellaneous
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H.1.1 Confirma on of 3rd Party Developer Organisa on Details H.3.2 Evidence of Designer’s Warranty to Crossrail H.1.3 Crossrail issued Informa on Disclosure Agreement H.1.4. Agreements to recover fees in respect of services or informa on provided or novated to Developers, including Invoicing Instruc ons -
-
H.2.6. Check of the development maintenance regime to consider and de-risk ac vi es which might interfere with the opera on of the Crossrail sta on nearby.
H.3.5 Agreements to coordinate Construcon interface health & Safety, e.g. · Crane oversail · Shared access · Hoarding boundaries
-
H.4.6 Agreement of protocols to control any interference of planned maintenance ac vi es significantly affec ng the opera ng Crossrail
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4 Crossrail’s standard condiƟons 4.1
Crossrail have the right to be consulted on all development occurring within the Safeguarding Limits. Typically such development is referred to Crossrail by the Local Planning Authority for comment. Typically the following condi ons would be recommended to Planning Authori es in order to protect the Crossrail Project. Crossrail condiƟon for foundaƟon design, noise, vibraƟon and seƩlement C1
None of the development hereby permi ed shall be commenced un l detailed design and construc on method statements for all of the ground floor structures, founda ons and basements and for any other structures below ground level, including piling, any other temporary or permanent installa ons and for site inves ga ons, have been submi ed to and approved in wri ng by the Local Planning Authority which:(i)
Accommodate the loca on and of the Crossrail structures including temporary works,
(ii)
Accommodate ground movement arising from the construc on thereof,
(iii)
Mi gate the effects of noise and vibra on arising from the opera on of the Crossrail railway within the tunnels and other structures.
(iv)
Mi gate the effects on Crossrail, of ground movement arising from development
The development shall be carried out in all respects in accordance with the approved design and method statements. All structures and works comprised within the development hereby permi ed which are required by paragraphs 1(i), 1 (ii), 1 (iii) and 1(iv) of this condi on shall be completed, in their en rety, before any part of the building[s] hereby permi ed is/are occupied. Crossrail condiƟon – concurrent working C2
None of the development hereby permi ed shall be commenced un l a method statement has been submi ed to, and approved in wri ng, by the Local Planning Authority to include arrangements to secure that, during any period when concurrent construc on is taking place of both the permi ed development and of the Crossrail structures and tunnels in or adjacent to the site of the approved development, the construc on of the Crossrail structures and tunnels is not impeded.
C3
No works below ground level comprised within the permi ed development shall be carried out at any me (i)
when sprayed concrete lined tunnels or compensa on grou ng works are being undertaken in close proximity
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5 ConsideraƟons for complex development close to Crossrail assets completed or under construcƟon 5.1
Introduc on 5.1.1 The construc on of deep or complex founda ons close to Crossrail’s developing infrastructure may generate significant ground movements which, if unchecked, may adversely impact Crossrail’s buried assets. This addendum sets out deliverables which are addi onal to the CDS iden fied in Crossrail Informa on for Developers March 2012 (the Guide), and which serve to demonstrate how risk mi ga on will be undertaken to protect Crossrail’s assets in the interim period un l Crossrail is handed over to the future Operator. 5.1.2 Crossrail will review the deliverables and return an endorsement of “No Objec on” to the release of its Safeguarding planning condi ons, if it is reasonably sa sfied that compliance has been demonstrated
5.2
Compliance Criteria 5.2.1 If there is considered to be a significant risk of impact to Crossrail’s assets then developers are expected to provide evidence to demonstrate that their construc on impacts do not breach Crossrail systems compliance requirements, thus: a)
tunnel, box and sha below ground structures are not overstressed;
b)
above ground Crossrail structures are not loaded or relied upon for support (unless this has been agreed to by CRL);
c)
sta on and (other surface intercep ng infrastructure) comple on works (including reinstatement of Urban Realm), operability and serviceability is not compromised;
d)
waterproofing (par cularly of tunnel segment joints) is not impaired;
e)
minimum gauge clearance (between the tunnel lining and railway systems), is not infringed;
f)
predicted distor on of the track geometry resul ng from any movement of the tunnel lining, does not exceed the ‘No Mandated Requirement’ threshold described in Appendix A of the Network Rail Standard NR/L2/TRK/001/C01 or current Standard if replaced;
g)
as a guide the minimum predicted curvature induced by ground movements along the axis of the running tunnel in any plane should not reduce below a radius of 10km. This radius is considered the minimum not requiring poten al maintenance interven on (e.g. track adjustment) and applies across the whole of the Central sec on, except in the area of the Barbican estate between Farringdon and Liverpool St sta ons, where ghter constraints are required for the specialised track system in this area.
h)
(within influence of running tunnels) predicted ovalisa on (distor on) of the running tunnel and lining does not exceed more than ±10mm devia on from the theore cal detailed design profile. There may be scope to relax this limit pending the accuracy of tunnel construc on and dimensional tolerance available in the as-built profile;
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i)
(within influence of sta on pla orm tunnels) predicted ovalisa on (distor on) of pla orm tunnel linings does not exceed more than ±10mm devia on from the theore cal detailed design profile and tunnel intersec ons and connec ons are not stressed beyond structural limits, and predicted movements do not exceed the serviceability limits of any sensi ve equipment and systems (e.g. escalators) housed within the tunnels;
j)
Furthermore if railway systems are already installed then the predicted change in the ver cal dimension between the top of the rail and the overhead conductor, shall not exceed (+10mm, -2mm). Subject to acceptance by Crossrail there may be scope to relax the limit pending construc on tolerance le over in the as-built profile and systems installed. Limits on permissible distor on of sta on tunnel and sha linings are subject to movement tolerance of the systems (escalators etc.) within and will be considered on a case by case basis;
k)
The Developer’s below ground structures are detailed and constructed in a manner that ensures that Crossrail assets are not put at risk. Figure 2 illustrates risks to tunnels from piling in close proximity. Physical Impact
D
Bentonite Leakage
Induced Ovalling
Pile Loading
Soil Collapse
Basement ExcavaƟon
Overburden
0
Figure 2. An illustra on of poten al tunnel risks induced by large diameter piling in close proximity
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5.3
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Developer’s Ground Movement Impact Assessment 5.3.1 Pending dialogue with developer’s engineers, Crossrail will issue engineering details of affected assets to help Developers’ designers to assess the ground movement impact on Crossrail, in order to prove compliance and to develop risk mi ga on plans as necessary. The Developers’ competent engineers are free to choose their own methods of modelling and analysis provided that:
5.4
a)
methods and models are based on proven geotechnical engineering principles and prac ce for ascertaining the soil-structure interac on in London ground condi ons;
b)
methods account for the underlying geology and sequence of construc on of the development, the influence of temporary works such as temporary unloading and loading and dewatering, and the effect of incremental loading and unloading effects and;
c)
Crossrail gives its No Objec on to the proposed analysis strategy (basis and assump ons) prior to commencement of detailed analysis;
d)
‘Standards’ are complied with;
e)
if design tools are used (so ware packages etc.) then these have a proven track record in the UK industry;
f)
analysis takes into considera on site-specific constraints (e.g. other nearby structures), where these are likely to significantly influence impacts from the development;
g)
results are clearly presented to Crossrail, in a format that does not require further interpreta on to prove compliance.
Deliverables for the demonstra on of Crossrail Safeguarding 5.4.1 The Developer would be expected to submit a Development Impact Assessment for review to CRL, which shows that the Crossrail assets are suitably protected. The impact assessment will consider: a)
a narra ve describing the analysis basis and technical assump ons;
b)
a narra ve describing the detailed analysis, results and conclusions of the impact assessment, also explaining any significant effects resul ng from the construc on sequence;
c)
a register of interface risks including tabled recommenda ons (if required) for risk-based control measures, to contain significant risks to Crossrail’s assets, throughout the development programme, including such considera ons as unexploded ordnance (UXO) and transmission of groundborne vibra on. The register is to be issued ini ally and therea er it should be maintained and updated and be made available to Crossrail upon request; . NOTE: for all risks poten ally catastrophic to the construc on or opera on of Crossrail (e.g. discovery of a UXO),
d)
•
the Developer shall ensure provision in its emergency response planning to contact the Crossrail Helpdesk immediately (0345 602 3813) to enable Crossrail’s implementa on of its emergency response
•
the Developer shall alert contacted Emergency Services (including bomb disposal) to the presence of Crossrail buried assets nearby;
a commitment by the Developer (Client) to adopt designer’s recommenda ons (or valid reasons if Clients choose not to adopt recommenda ons);
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e)
a Category 3 Check Cer ficate (reduced to 2 or 1 at the discre on of Crossrail and pending risk), countersigned by a senior company representa ve of the Developer’s independent checker, which cer fies the accuracy and validity of the soil-structure interac on model, the ground movement impact assessment and results (taking into account the construc on strategy and site-specific constraints), as verified by the Checker’s competent specialists;
f)
construc on method statements and details as necessary to explain the construc on sequence; to demonstrate that it is consistent with the assessment engineer’s modelled assump ons, and to demonstrate that site planning for permanent and temporary works duly considers the protec on of Crossrail assets;
g)
the Monitoring Plan and Monitoring Response Ac on Plan (see 5.5)
h)
readiness Review note (see 5.5.10)
i)
a monitoring Close-out report explaining the extent of movement experienced by the Crossrail asset and demonstra ng that stable condi ons were reached following comple on.
k)
details / method statements of all site inves ga ons to be issued to Crossrail prior to commencement of works demonstra ng SI contractor’s awareness and due considera on of the loca on of Crossrail’s buried assets and significant assets of others.
Sec on 3.8 presents a generic list of deliverables, the final choice of which will depend on the development scope. It is recommended that a list of deliverables be agreed during consulta on with Crossrail’s 3rd Party Developments Manager. 5.4.2 Crossrail may charge for the me of specialist resources commissioned to review and advise it on the findings of the Developer’s Assessment. 5.5
Monitoring of Ground Movement 5.5.1 Pending the risks and impacts iden fied the Developer shall provide an asset Monitoring Plan prior to commencement of impac ng works. The Plan will verify that actual movements realised during construc on to aid the Developer’s control of ground movement. 5.5.2 The grounds for deploying monitoring and extent along which tunnels are to be monitored will depend on the significance and certainty of predicted ground movement impact. As a guide if it is decided to implement a monitoirng plan, it is suggested that 2mm predicted diametric or radial distor on be adopted as the lower limit of the monitored extent, for conven onal developments comprising conven onal demoli on and basement excava ons founded in well determined and understood ground, free of other risk factors, such as large subterranean assets/ structures in close proximity or geological features, etc, that might impair predic on accuracy. 5.5.3 The Monitoring Plan developed in consulta on with Crossrail shall include: a)
the Instrumenta on and Monitoring (I&M) scope, developed in consulta on with Crossrail and including performance requirements and layout of instrumenta on and an interface protocol for managing data transmission between the par es. Crossrail will provide guidance on constraints affec ng the choice and installa on of monitoring equipment installed in its assets. The scope shall consider the findings of the Developer’s ground movement analysis, state of comple on of the asset and construc on opera ons during monitoring and sensi vity to movement;
b)
a plan showing the tunnel, development and limits of predicted ground movement impact at tunnel axis level, superimposed on OS mapping and showing the monitored tunnel
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extents, dimensioned and referenced to mapped se ng out points; c)
the agreed monitoring schedule including the period and frequency of measurement readings for baseline calibra on for the construc on period and therea er. Monitoring frequency shall be governed by the severity of impact risk for each significant stage of construc on;
d)
the Stability Acceptance Criteria agreed between the Developer and CRL, defining when monitoring may cease a er comple on;
e)
the Monitoring Ac on Plan, including defined orders of movement for green, amber, red, black trigger response ac ons to mi gate adverse observed in-tunnel movement trends. The Developer will consult Crossrail to agree the green, amber, red and black (if affec ng opera onal track) movement trigger levels, and to advise response ac ons to arrest adverse in-tunnel movement trends which might otherwise have long term consequences on the opera on of the Crossrail asset. It is worth no ng that Crossrail in its construc on of tunnels and sha s assumed nominally 75%, 100% and 125% of the predicted movement for its green, amber and red trigger alerts respec vely;
f)
a communica on plan including template(s) for repor ng monitoring results and response ac ons and arrangements for Crossrail review and discussion of monitoring results;
g)
provisions for pre- and post-construc on visual inspec ons of the Crossrail asset to ascertain the condi on of the asset before and a er comple on of the developer’s works;
h)
provisions for a close-out report.
5.5.4 The Monitoring Plan shall be submi ed to Crossrail for review and acceptance prior to the start of construc on of the influen al development works. 5.5.5 Monitoring results shall: a)
Verify designer’s modelled predic ons for in-tunnel movements;
b)
Allow early detec on of aberrant movement trends;
c)
Inform the Developer’s risk-based Response Ac on Plan which is to be developed in conjunc on with Crossrail, and which informs Crossrail’s Emergency Response Plan which serves to protect of personnel present in the asset at the me.
5.5.6 Unless agreed otherwise the Developer shall fund the costs of installa on, implementa on and eventual removal of monitoring to protect the Crossrail asset from its construc on impact plus the costs of Crossrail personnel engaged in the review of monitoring results. 5.5.7 It is envisaged that, during Crossrail’ s construc on phase it will be most cost effec ve and most efficient if monitoring on Crossrail’s property is procured, installed and measured by Crossrail under terms set out in a Monitoring Agreement between the par es. 5.5.8 Monitoring equipment and methods shall be installed if required, calibrated, tested and baselined prior to commencement of impact on the assets. 5.5.9 Unless agreed otherwise the Developer shall regularly report monitoring results to Crossrail throughout the course of itrs works. Monitoirng results reports shall include 1.
Graphs and plots prepared to a format to be agreed with CRL for each monitored array as defined within the Monitoring Plan including:
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a)
the displaced cross-sec onal shape of the Crossrail Tunnels referenced to the baseline cross-sec onal shape as measured at the start of the monitoring of the Phase 2 Works to reflect differences from base readings
b)
the displaced cross-sec onal shape of the Crossrail Tunnels referenced to the previously reported cross-sec onal shape to reflect differences from previous readings
c)
changes in eas ng and northing grid coordinates for prisms on the le and right hand side extremi es of each tunnel referenced to baseline coordinates (plo ed against me)
d)
changes in ver cal height measured at the crown of the Crossrail Tunnels and at track slab level, referenced to the baseline levels (plo ed against me)
e)
changes in all the chord lengths extrapolated across the arrays (plo ed against me)
2.
A graph showing the accumulated radius of the Crossrail Tunnel curvature induced by ground movement along the length of each tunnel referenced to the baseline
3.
Graphs showing the accumulated displacement of monitored piles within the basement retaining walls referenced to the baseline
The Crossrail Safeguarding team will facilitate the interface engagement between the Developer and the wider Crossrail team to minimise delay. 5.5.10 The Developer shall provide evidence that it has undertaken a review prior to commencement of influen al works, which cer fies the readiness of systems installed to mi gate predicted impacts on Crossrail and procedures to establish and expedite correc ve ac ons in the event that monitoring shows breaches of trigger levels. 5.5.11 Groundborne Vibra on during construc on is a poten al risk for Crossrail par cularly during open faced construc on of its tunnels. For further guidance on assessment please see Sec on 4 of this document. Crossrail would object if developers’ proposals included percussion driven piling and other vibra on inducing methods, within 15m plan distance of its assets. Similarly Crossrail would be concerned if developers’ proposals were likely to induce significant vibra on in the vicinity, e.g. during demoli on and breaking out of buried obstruc ons. If significant vibra on is an cipated during construc on then the Developer is expected to propose details for acceptance of appropriate mi ga on . 5.6
Defect Surveys 5.6.1 Depending on the nature of risk imposed by the development construc on Crossrail may insist that pre- and post-construc on visual defects inspec ons of its impacted asset be undertaken jointly with the Developer’s representa ve. 5.6.2 The Method Statement for conduc ng in-tunnel defects surveys for the purposes of infrastructure protec on is contained in Document No. CRL1-XRL-N3-GMS-CR001-50001. Methods shall adhere to relevant LU Standards contained therein. 5.6.3 The Developer’s engineer will prepare annotated photographic inspec on reports which are to be agreed jointly with Crossrail and which will provide evidence of any change in the condi on of the asset as a result of construc on. 5.6.4 It is envisaged that defect surveys will be arranged and undertaken under terms set out in a Monitoring Agreement between the par es. 5. 5.6.5 The Developer should note that the lead me required to undertake surveys is dependent on Crossrail works contractors’ planned construc on ac vi es taking place in the assets concerned. Surveys will need to be med to minimise interference with scheduled in-tunnel works.
Crossrail: A technical guide for developers |
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6 Noise and vibraƟon 6.1
Opera on of Crossrail trains may cause vibra on and re-radiated noise to be transmi ed from the tunnels to the founda ons of the development. Therefore, founda ons should be designed so that the level of noise generated within the building by this vibra on remains within limits acceptable to the Developer without CRL having to install mi ga on measures within the tunnel.
6.2
Crossrail Line 1 is subject to a range of requirements including Undertakings and Assurances given during the Parliamentary passage of the Crossrail Bill through Parliament. There are also legal agreements which determine the degree of provision for controlling vibra on and ground borne noise in the opera on of Crossrail vehicles. These requirements apply in some respects system-wide although the design limits involved are specific to the class of use of the building (i.e. a general limit for residen al development). Addi onally, there are locally specific requirements for individual buildings.
6.3
In most areas where new development is proposed, it will either be planned to take place on the site of a previous building which will have already been the subject of a design limit for vibra on and groundborne noise according to its use, or be situated between other exis ng buildings to which a limit applies.
6.4
In the case of redevelopment of a site previously occupied by a building subject to an exis ng limit for vibra on and groundborne noise it does not automa cally follow that the likely level of vibra on and groundborne noise in the new building will meet Crossrail’s requirements, because the founda ons may differ in ways which increase the transmission of vibra on and groundborne noise into the building. Likewise, the proximity of an exis ng building to a newly developed site does not automa cally ensure that the limits will not be exceeded in the proposed new buildings, because of differences in founda ons, local geotechnical condi ons, differences in train speeds and other parameters.
6.5
The system-wide, use-specific limits to which CRL is subject are set out in Informa on Paper D10. In summary, the requirement is that the nominated undertaker will be required to design the permanent track support system so that the level of groundborne noise near the centre of any noise-sensi ve room is predicted in all reasonably foreseeable circumstances not to exceed the levels in Table 1 (page 10). Reasonable endeavours are required to adopt mi ga on measures that will further reduce any adverse environmental impacts to any residen al property in which the level of groundborne noise arising from the opera on of the Crossrail passenger service near the centre of any noise-sensi ve room is predicted to equal or exceed 35dB LAmax,S.
6.6
The nominated undertaker will also be required to design the permanent track system, in accordance with the guidance in the 1992 version of Bri sh Standard 6472 “Guide to evalua on of human exposure to vibra on in buildings (1 Hz to 80 Hz)”, so that opera onal vibra on arising from it at buildings iden fied in Table 1, expressed as vibra on dose value (VDV), is predicted in all reasonably foreseeable circumstances not to exceed the levels presented in Table 2 (page 10). Note that since the 1992 version is used the VDV values use weigh ng Wg for z-axis vibra on for guidance only. For further informa on, contact the CRL Third Party Development Manager.
6.7
The levels of vibra on at the tunnel wall caused by the passage of a single train travelling at 100 km/h and at 80 km/h are presented in Tables 1 and 2 in Appendix A. The same data are also presented in graphic format in Figures 1 to 4 in Appendix A. It should be noted that these data are based on conserva ve assump ons of track s ffness and should be used for guidance only. For further informa on, contact the CRL Third Party Development Manager.
6.8
With regard to vibra on, it is normally the case that where groundborne noise criteria are sa sfied, vibra on criteria are also sa sfied. The data in Appendix A relate to vibra on down to the 20Hz 1/3 octave band. In cases where a development involves par cular sensi vity to vibra on predic ons down to 1Hz may be required and further informa on should be sought from the CRL Third Party Development Manager.
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| Crossrail: A technical guide for developers
Table 1: Construc on1 and Opera onal Groundborne Noise Criteria Building
Level/Measure
Residen al buildings
40dB LAmax,S
Offices2
40dB
LAmax,S
Hotels2
40dB
LAmax,S
Theatres
25dB
LAmax,S
Large Auditoria/Concert Halls
25dB
LAmax,S
Sound recording studios
30dB
LAmax,S
Places of mee ng for religious worship3
35dB
LAmax,S
Courts, lecture theatres
35dB
LAmax,S
Small Auditoria/halls
35dB
LAmax,S
Hospitals, laboratories
A40dB
Libraries
40dB
LAmax,S
LAmax,S
Notes 1. Excluding the groundborne noise from the passage of the tunnel boring machine (TBM). 2. Significance criteria not included in the Scope and Methodology set out in Appendix A2, Vol. 5 of the Crossrail Environmental Statement, added here for clarifica on. 3. Meaning a place the principal use of which is for people to come together as a congrega on to worship God or do reverence to a deity.
Table 2: Construc on and Opera onal Vibra on Criteria In the Absence of Appreciable Exis ng Levels of Vibra on
Appreciable Exis ng Levels of Vibra on 1,2
VDV ms-1.75 Day me (07:00 – 23:00)
VDV ms-1.75 Night- me (23:00 – 07:00)
% increase in VDV
0.31
0.18
40
Notes: 1. Highest impact category used, day me or night- me. 2. There is an appreciable exis ng level of vibra on where day me and night- me vibra on dose values (VDVs) exceed 0.22 ms-1.75 and 0.13 ms-1.75 respec vely.
Appendix A
Appendix A Noise and VibraƟon Assessment Summary
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| Crossrail: A technical guide for developers
Appendix A
Crossrail Contract XR/K/680 Noise and Vibra on Assessment and Mi ga on Report No 075/14 Resilient Slab Track Tunnel Vibra on Predic ons Revision 3 March 1998
Crossrail Contract XR/K/680 Noise and Vibra on Assessment and Mi ga on Report No 075/14 Tunnel Vibra on Predic ons Issue and Revised Record Issue
Date
Originator
Checked
Approved
Descrip on
Status
1 1 1 1
11/06/96 10/07/96 31/07/96 16/03/98
RMTT RMTT RMTT RMTT
FLT JSP JSP FLT
RMTT RMTT RMTT RMTT
Report Report Report Report
1st Issue Revision 1 Revision 2 Revision 3
Rupert Taylor Ltd Consultants in Acous cs, Noise and Vibra on Spring Garden, Fairwarp, Nr Uckfield, East Sussex, TN22 3BG Telephone: 01825 712435 Fax: 01825 712542
Appendix A
Crossrail: A technical guide for developers |
Page 23
1
IntroducƟon
1.1
This report provides predic ons of the vibra on of the wall of the tunnels in the Crossrail central sec on, for use in the assessment of groundborne noise in adjacent buildings.
2
DescripƟon of the Model
2.1
The predic on model used for these predic ons employs an algorithm for the solu on of the wave equa on for the propaga on of waves in bars, plates and solids, using finite difference methods. The model computes vibra on of each element as a func on of me, which is then subjected to Discrete Fourier Transform using a standard Fast Fourier Transform algorithm. The bandwidth of the predic on results covers the 1/3 octave bands centred on 20Hz to 160Hz.
2.2
The model consists of a sec on of tunnel the length of one rail vehicle, connected end-to-end to create an infinitely long tunnel and train. In view of the fact that the length of a 12-car Crossrail train is 47 mes the tunnel diameter, the modelling of an infinitely long train is valid. The tunnel is modelled as a rolledup curved plate surrounded by soil. Each rail is modelled as a beam supported on periodic resilient supports. The train is represented by the unsprung masses of the wheels and associated equipment, the sprung bogie masses, the secondary suspension and the car body.
3
AssumpƟons
3.1
The following assump ons were made: Track
Vehicles
rail mass
56.4kg/m
per rail
rail s ffness
4.665MNm2
per rail
rail damping
0Ns/m
per rail
rail pad s ffness (dynamic)
25.6MN/m
per metre of rail
rail pad damping ( η )
0.1
dimensionless
Hertzian contact s ffness
1.2GN/m
per wheel
unsprung mass
835kg
per wheel
sprung mass
815kg
per wheel
primary suspension s ffness
1.3MN/m
per wheel
primary suspension damping
10kNs/m
per wheel
secondary suspension s ffness
117.5kN/m
per wheel
secondary suspension damping
11.651kNs/m
per wheel
body mass
5705kg
per wheel
Note: where the Crossrail design aim for groundborne noise of 40dB LAmax,S due to the passage of one Crossrail train cannot be met using baseplates having the dynamic s ffness and damping quoted above, a baseplate with a lower s ffness of 14MN/m per metre of rail may be considered.
3.2
The baseplate specifica on used in the above assump ons has a higher dynamic s ffness than CRL is currently proposing to adopt, in order to ensure that a conserva ve predic on of noise level is considered in the developer’s design.
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3.3
| Crossrail: A technical guide for developers
Appendix A
Tunnel Design The tunnel assump on was a 6m inside diameter tunnel with 300mm thick concrete linings.
3.4
Rail Roughness A roughness spectrum of 30dB re 1 micron in the 1/3 octave band centred on a wavelength of 2m, sloping at a rate of -15dB per decade to 0dB in the 1/3 octave band centred on 0.02m. This spectrum was used to represent the combined effects of wheel and rail roughness.
3.5
Soil The soil characteris cs used were those of London Clay.
4
PredicƟon Results
4.1
The results are presented in tabular form in Tables 1 and 2 for two train speeds of 80km/h and 100km/h respec vely, in terms of 1/3 octave spectra of radial tunnel wall velocity in decibels r.e. 1 nanometre per second, for 26 posi ons around the tunnel circumference. The same data are also plo ed in Figures 1 to 4.
5
ApplicaƟon of the Results
5.1
The results may be used for es ma ng the likely level of groundborne noise inside buildings above the tunnel alignment. For this purpose it is necessary to take account of the effect of vibra on propaga on through the soil, of coupling loss factor between the soil and the building, and the dynamic response of the building. A er applying correc ons for these effects, the results in terms of the root-mean-square (rms) velocity in 1/3 octave bands can be used to es mate the sound pressure level inside a typical room. In many cases, the rela onship between room sound pressure level and ‘rms’ velocity of the room surfaces is approximately equivalent to Lp= Lv –27dB, where Lp is the 1/3 octave band sound pressure level: Lv is the ‘rms’ vibra on velocity in dB re 1 nanometer per second.
5.2
Propaga on through the soil is a very complex phenomenon, since the vibra on is propagated in three ways — as shear, compression and surface waves, and as shown by the results given in this report, the source strength varies around the tunnel circumference. A worst-case approach would be to take the highest levels in the tunnel wall ‘visible’ to the receiving structure, and use a distance func on as follows:
Where Lt is the tunnel wall radial velocity for a tunnel of radius r0 and Lr is the soil radial velocity at distance r, both in dB re 1 nanometer/second, cs is the phase speed of compression waves in soil with loss factor η and is the angular frequency of each 1/3 octave band in radians per second. The coupling loss factor and building response generally have opposite sign and as a first order approxima on they may be assumed to cancel. In the case of piled founda ons, if r is taken to be the shortest distance to any part of the nearest pile, a worst-case es mate will be obtained. Any distance units may be used, provided they are consistent throughout. 5.3
The overall 1/3 octave spectrum may be converted to dB(A) by decibel addi on of the band levels a er applying the value of the ‘A-weigh ng’ curve of each band centre frequency.
5.4
To obtain a more precise predic on of groundborne noise levels in buildings, it is necessary to use numerical modelling methods based on finite-difference or finite-element techniques.
99
100
103
95
92
88
90
94
88
31.5
40
50
63
80
100
125
160
84
89
82
79
83
85
96
95
85
86
28
87
93
89
88
91
92
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96
84
85
42
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180
Degrees
82
93
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194
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Degrees
82
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222
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235
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249
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88
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263
89
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263
87
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97
94
277
88
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88
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277
87
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291
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305
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318
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84
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318
84
90
85
80
83
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88
332
84
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82
79
83
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332
84
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103
100
93
91
346
83
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102
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346
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360
88
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88
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91
90
360
Crossrail: A technical guide for developers |
89
89
86
90
92
103
93
94
25
91
14
92
0
20
Hz
Table 2 – 1/3 Octave band spectra of vibra onvelocity of tunnel circumference (0 degrees = crown), dB re 1 nanometre per second. Train speed: 100km/h
83
89
86
85
90
92
102
90
91
25
89
14
90
0
20
Hz
Table 1 – 1/3 Octave band spectra of vibra onvelocity of tunnel circumference (0 degrees = crown), dB re 1 nanometre per second. Train speed: 80km/h
Appendix A Page 25
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| Crossrail: A technical guide for developers
Figure 1 Distribu on of vibra on levels around tunnel circumference (0 degrees – crown) RST 80 km/h
Appendix A
Appendix A
Crossrail: A technical guide for developers |
Figure 2 Distribu on of vibra on levels around tunnel circumference (0 degrees – crown) RST 100 km/h
Page 27
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| Crossrail: A technical guide for developers
Appendix A
dB re 1 nm/s
Figure 3 Distribu on of vibra on levels around tunnel circumference – RST 80/km/h
Appendix A
Crossrail: A technical guide for developers |
dB re 1 nm/s
Figure 4 Distribu on of vibra on levels around tunnel circumference – RST 100/km/h
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| Crossrail: A technical guide for developers
Appendix A
Appendix B
Crossrail: A technical guide for developers |
Appendix B Monitoring Agreement Template (for monitoring of CRL assets)
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| Crossrail: A technical guide for developers
Appendix B
DRAFT GENERIC TEMPLATE, SUBJECT TO AGREEMENT Dated
2016
(1)
Crossrail Limited
(2)
[ insert Developer ]
Agreement
rela ng to the monitoring of Crossrail tunnels in connec on with the development of land and [insert development]
Appendix B
Crossrail: A technical guide for developers |
Page 33
PARTICULARS Date Agreed Stability Acceptance Criteria
Means the criteria for determining the cessa on of ground movement impact on the Crossrail Tunnels set out in the Tunnel Monitoring Plan
CRL
Means Crossrail Limited (company no. 04212657) whose registered office is at 25 Canada Square Canary Wharf London E14 5LQ
Crossrail
Means the proposed railway running from Maidenhead to Abbey Wood to be constructed pursuant to the Crossrail Act 2008 Crossrail
Crossrail Handover Date
Means the date on which CRL proposes to handover the Crossrail Tunnels to Transport for London or such other party as provided for under clause 4.9.
Crossrail Tunnels
Means the part of Crossrail comprising the eastbound and westbound running tunnels and adjoining infrastructure between [insert chainage extents of impacted Crossrail infrastructure] as shown on the Plan and which may experience diametric, radial or other distor on as a result of the Works as defined in Crossrail Safeguarding Guidance
Crossrail Safeguarding Guidance
Means the guidance note en tled Crossrail Informa on for Developers (December 2016) prepared by CRL which specifies minimum requirements of deliverables prepared by the Developer for the purpose of demonstra ng mi ga on of risks imposed by works in the vicinity of the Crossrail Tunnels
Developer
[ Insert Address ] including its successors in tle
Development
Means the comprehensive redevelopment of the Development Site: (a) as authorised by the planning permission granted by [insert Planning Authority] on [insert date] [insert Planning Applica on reference] and any further amendment, revision or varia on thereto; or (b) pursuant to any planning permission that may be granted for the redevelopment of the Development Site either by the [insert the Planning Authority], the Mayor of London or the Secretary of State (as applicable)
Development Period
Means the period of the Works the commencement of which shall be advised to CRL by the Developer but indica vely commencing on [insert date] and expiring at midnight [insert date] unless otherwise agreed in wri ng
Development Monitoring Plan
Means the component within the Monitoring Plan prepared by the Developer which specifies the requirements and the schedule for the monitoring of movement of the Development in so far as it might impact the Crossrail Tunnels and which has been approved by Crossrail and is a ached to this Agreement at Appendix [2]
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| Crossrail: A technical guide for developers
Appendix B
Development Site
Means the land and buildings at [insert development address] as registered under tle number [insert tle] at HM Land Registry as shown indica vely edged red on the Plan
Ground Movement Impact Assessment
Means the Category 3 (independent) check cer fied engineering assessment or assessments of ground movement impact on Crossrail affected assets an cipated as a consequence of the Works undertaken on behalf of the Developer and following at least the minimum requirements set out in Crossrail Safeguarding Guidance and which shall be based upon the principles contained within the preliminary ground movement impact assessment which has been approved by Crossrail and which is a ached to this Agreement at Appendix [insert]
Monitoring AcƟon Plan
Means the plan prepared on behalf of the Developer in accordance with the Crossrail Safeguarding Guidance iden fying the ac ons to be taken by the Developer in the event that the trigger levels referred to in the Tunnel Monitoring Plan are met and which has been accepted by Crossrail and is a ached to this Agreement at Appendix [insert] as revised from me to me in accordance with the terms of this agreement.
Monitoring Contractor
Means [insert the monitoring contractor and company number whose registered office is [insert company address] or such other monitoring contractor as may be appointed by CRL and no fied in wri ng to the Developer.
Monitoring Data
Means the measured ground movement data obtained from the Monitoring Equipment by CRL and the implementa on of the Tunnel Monitoring Plan by CRL
Monitoring Equipment
Means prisms and all other associated equipment required for the detec on, measuring, collec on and relaying of ground movement data in connec on with ground movement in the vicinity of and which may affect the Crossrail Tunnels which equipment is to be installed within the confines of the Crossrail Tunnels as specified in the Tunnel Monitoring Plan
Monitoring Plan
Means the strategy prepared on behalf of the Developer for monitoring and controlling ground movement which may be caused by the Works comprising the Development Monitoring Plan and the Tunnel Monitoring Plan as revised from me to me in accordance with the terms of this agreement.
Plan
Means the drawing a ached to this Agreement with reference number [insert number as appropriate]
Post-construcƟon Survey
Means a survey of the condi on of the Crossrail Tunnels following comple on of the Works the scope of which shall be in accordance with CRL’s Method Statement CRL1-XRL-N3-GMS-CR001-50001
Pre-construcƟon Survey
Means a survey of the condi on of the Crossrail Tunnels prior to commencement of the Phase 2 Works the scope of which shall be in accordance with CRL’s Method Statement CRL1-XRL-N3-GMS-CR001-50001
Pre-report
Means the report of the Pre-construc on Survey
Appendix B
Crossrail: A technical guide for developers |
Page 35
Post-report
Means the report of the Post-construc on Survey
Results Interpreted Monitoring Reports
Means reports compiled on behalf of the Developer at agreed intervals and detailing the interpreta on of Monitoring Data during and up to the period reported. As a minimum the reports shall contain 1.
A summary descrip on of development work progressed during the period reported
2.
A summary descrip on of ground movement occurring during the period reported as measured at surface and at depth and commentary comparing measured movements to predicted ground movement commensurate with the reported stage of works
3.
Graphs and plots prepared to a format to be agreed with Crossrail for each monitored array as defined within the Monitoring Plan including
a)
the displaced cross-sec onal shape of the tunnels referenced to the baseline cross-sec onal shape as measured at the start of Phase 2 monitoring to reflect differences from base readings
b) the displaced cross-sec onal shape of the tunnels referenced to the previously reported cross-sec onal shape to reflect differences from previous readings c)
changes in eas ng and northing grid coordinates for prisms on the le and right hand side extremi es of each tunnel referenced to baseline coordinates (plo ed against me)
d) changes in ver cal height measured at the crown of the tunnels and at track slab level, referenced to the baseline levels (plo ed against me) e) changes in all the chord lengths extrapolated across the arrays (plo ed against me)
Tunnel Monitoring Plan
4.
A Graph showing the accumulated radius of tunnel curvature induced by ground movement along the length of each tunnel referenced to the baseline
5.
Graphs showing the accumulated displacement of monitored piles within the basement retaining walls referenced to the baseline
Means the component within the Monitoring Plan prepared on behalf of the Developer based upon the findings of the preliminary ground movement impact assessment a ached at Appendix [insert] and prepared in accordance with Crossrail Safeguarding Guidance which specifies the requirements and the schedule for the monitoring from within the confines of the Crossrail Tunnels of any ground movement which may be caused by the carrying out of the Works and which is, together with a summary of such plan prepared by CRL, a ached at Appendix [insert]
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| Crossrail: A technical guide for developers
Appendix B
Working Day
Means any day of the week other than Saturday, Sunday or any public or bank holiday
Works
Means the works to be undertaken by or on behalf of the Developer for the purposes of the construc on of the Development on the Development Site and for the avoidance of doubt includes [insert descrip on of works being monitored]
THIS AGREEMENT is made on the date set out in the Par culars BETWEEN (1)
CRL; and
(2)
The Developer
BACKGROUND A.
The Developer is desirous of undertaking the Works .
B.
The Par es have agreed that it is in both their interests:
C.
•
that pre- and post-construc on condi on surveys be undertaken in respect of the Crossrail Tunnels;
•
that the Crossrail Tunnels are monitored for any signs of distor on during the Development Period in order to ensure that any ground movement and/or distor ons are within agreed limits such that the Crossrail Tunnels are not adversely affected by the Works
CRL has agreed to put in place and to maintain the Monitoring Equipment and to supply the Monitoring Data to the Developer and the Developer has agreed to reimburse CRL the reasonable and proper costs in rela on thereto as set out in this Agreement
OPERATIVE PROVISIONS 1.
INTERPRETATION
1.1
In this Agreement: 1.1.1 the clause headings do not affect its interpreta on; 1.1.2 unless otherwise indicated, references to clauses Schedules and Appendices are to clauses of and Schedules and Appendices to this Agreement and references in a Schedule or Appendix to a Part or paragraph are to a Part or paragraph of that Schedule or Appendix; 1.1.3 references to any statute or statutory provision include references to: 1.1.3.1
all Acts of Parliament and all other legisla on having legal effect in the United Kingdom; and
1.1.3.2
any subsequent statutes directly or indirectly amending, consolida ng, extending, replacing or re enac ng that statute and also include any orders, regula ons, instruments or other subordinate legisla on made under that statute;
1.1.4
“including” means “including, without limita on”;
1.1.5
where two or more people form a party to this Agreement, the obliga ons they undertake may be enforced against them all jointly or against each individually;
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1.1.6
if any provision is held to be illegal, invalid or unenforceable, the legality, validity and enforceability of the remainder of this Agreement is to be unaffected; and
1.1.7
all words impor ng the singular number only shall include the plural number and vice versa.
1.2
The Par culars form part of this Agreement and words and expressions set out in the Par culars are to be treated as defined terms in this Agreement
1.3
The par es to this Agreement do not intend that any of its terms will be enforceable by virtue of the Contracts (Rights of Third Par es) Act 1999 by any person not a party to it except a permi ed successor or assignee to the provisions hereof
2.
PRE-AND POST-CONSTRUCTION SURVEYS
2.1
Not less than six weeks before the commencement of the Phase 2 Works the Developer shall no fy CRL that it wishes to proceed with the Pre-construc on Survey and unless agreed otherwise beforehand the Developer shall not commence the Phase 2 Works un l the survey has been completed and agreed between the Par es in accordance with this clause 2
2.2
Not less than 2 months before the commencement of the Works the Developer shall no fy CRL that it wishes to proceed with the Pre-construc on Survey and unless agreed otherwise beforehand the Developer shall not commence the Works un l the survey has been completed and agreed between the Par es in accordance with this clause.
2.3
Within 10 Working days of receipt of the Pre-report pursuant to clause 2.2, CRL shall (ac ng reasonably) advise the Developer whether the survey is agreed or not
2.4
If CRL does not agree to the Pre-report it shall advise the Developer accordingly providing details as to why the Pre-report has not been agreed and the Developer shall, where it considers reasonable, make such changes as are required to sa sfy CRL’s reasonable concerns and re-submit the revised Pre-report to CRL for acceptance (such acceptance not to be unreasonably withheld or delayed)
2.5
Un l the Pre-construc on Survey is agreed Clauses 2.2 to 2.4 shall apply in rela on to any revised Prereport save that the period for response in clause 2.4 shall be five Working Days
2.6
Within 1 month of the later of Agreed Stability Acceptance Criteria being achieved and the end of the Development Period the Developer and CRL shall undertake the Post-construc on Survey and which may also be witnessed by CRL contractors and the Developer will send a copy to CRL for acceptance and clauses 2.3-2.5 shall apply (muta s mutandis) for the purposes of having the Post-report agreed
2.7
During the period between the comple on of the Pre-construc on Survey and the undertaking of the Post-construc on Survey the Developer or CRL (ac ng reasonably) may request further condi on surveys to be undertaken and following receipt of wri en no ce to that effect the Par es shall use their respec ve reasonable endeavours to undertake each survey and clauses 2.2 to 2.5 shall apply (muta s mutandis) for the purposes of having such interim surveys agreed
3.
DEVELOPER’S OBLIGATIONS
3.1
The Developer shall not commence the Works (or the relevant part thereof) un l it has submi ed the Ground Movement Impact Assessment to CRL and the same has been accepted by CRL in wri ng (such acceptance not to be unreasonably withheld or delayed)
3.2
Following submission of the Ground Movement Impact Assessment pursuant to clause 3.1, CRL (ac ng reasonably) may require the Monitoring Plan and/or Monitoring Ac on Plan to be revised to take account of any changes in an cipated ground movement iden fied by the Ground Movement Impact Assessment which have not already been addressed and resubmi ed to CRL for acceptance (such acceptance not to be unreasonably withheld or delayed)
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3.3
Prior to commencement of the Works the Developer shall submit to Crossrail for acceptance a proposed format for the Monitoring Results Interpreta on Report.
3.4
In the event that it is necessary to prepare and submit to CRL for acceptance any further Ground Movement Impact Assessments in respect of different phases of the Works or in the circumstances set out in clause
3.5
The Developer shall advise CRL in wri ng of any material changes to the design, method of construc on or sequence of construc on of the Works and where in CRL’s reasonable opinion any approved Ground Movement Impact assessment no longer reflects the an cipated ground movement then CRL shall advise the Developer accordingly and the Developer shall undertake a further Ground Movement Impact Assessment and submit the same to CRL for acceptance (such acceptance not to be unreasonably withheld or delayed) and clause 3.3 shall apply
3.6
The Developer shall use reasonable endeavours to implement and comply with the Development Monitoring Plan in accordance with the requirements set out in that plan during the Development Period
3.7
The Developer shall provide CRL with the Results Interpreted Monitoring Reports in respect of the Monitoring Data that the Developer receives from CRL under clause 4.1 on a fortnightly basis from commencement of the Works un l [amend as necessary ..e.g. comple on of load bearing piling and excava on of the proposed basement of the Development and therea er every 3 months during construc on of the shell and core of the Works] un l such me as the Stability Acceptance Criteria are reached or the end of the Development Period whichever is sooner
3.8
If reasonably required by CRL during the Development Period, the Developer shall a end mee ngs (at no more frequent than monthly intervals) to discuss the interpreted monitoring results from the Monitoring Plan
3.9
The Developer shall use reasonable endeavours to comply with the Monitoring Ac on Plan during the Development Period.
3.10
The Developer shall protect the Crossrail Tunnels (including taking measures reasonably s pulated by CRL) against physical damage and against distor on arising from an cipated ground movement, landslip, se lement or heave due to the carrying out of the Works
3.11
The Developer shall select such methods to be used for the execu on of the Works as shall (so far as is reasonably prac cable) minimise ground movement, landslip, se lement or heave to the Crossrail Tunnels and shall mi gate the impact of any ground movement, landslip, se lement or heave to Crossrail Tunnels caused by the Works so as to prevent so far as is reasonably possible any material adverse effect on Crossrail Tunnels and on the con nued safe construc on of the Crossrail Tunnels and shall supply details of its proposed methods to CRL together with plans and other related documenta on for reasonable comment and shall take full account of CRL’s reasonable comments
3.12
If during carrying out of the Works monitoring undertaken pursuant to the Tunnel Monitoring Plan indicates ground movement, landslip, se lement or heave or the movement of the Crossrail Tunnels as a result of the Works in excess of the predic ons accepted by CRL in the Ground Movement Impact Assessment either has occurred or may reasonably occur the Party undertaking such monitoring shall immediately no fy the other forthwith and the Developer shall: 3.12.1
(where such ground movement landslip se lement or heave or the movement of the Crossrail Tunnels has occurred) forthwith take all such reasonable measures as are appropriate in order to protect Crossrail Tunnels against the material effects of such ground movement landslip se lement heave or the movement and to prevent any further material ground movement landslip se lement or heave or movement of any Crossrail Tunnel (including as appropriate the suspension or accelera on of any relevant part of the Works or the implementa on of any other reasonable protec ve measures); and
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(whether or not such ground movement landslip se lement or heave or the movement of the Crossrail Tunnels has occurred) urgently ins gate such reasonable changes to the Works (including the suspension or accelera on of any Works) any building contractor’s working methods and/or its plant and equipment and/or take further measures pursuant to clause 4.2 in order to keep the ground movement, landslip, se lement or heave or the movement of Crossrail Tunnels within the limits of the predic ons accepted by CRL in the Ground Movement Impact Assessment
and in each case the Developer shall advise CRL of such measures or changes it proposes to undertake as soon as reasonably prac cable. 3.13
3.14
If notwithstanding the precau ons taken pursuant to this clause 3 repairs or other works are required to the Crossrail Tunnels at any me as a result of ground movement, landslip, se lement or heave or the movement of the Crossrail Tunnels (in excess of the predic ons accepted by Crossrail in the Ground Movement Impact Assessment) or other physical damage a ributable to the Works carried out by or on behalf of the Developer then:3.13.1
CRL shall no fy the Developer immediately it becomes aware of the need for such repair or other works and their es mated cost;
3.13.2
CRL may promptly carry out such repairs or other works (at the reasonable and proper expense of the Developer)
Clause 3.12 shall only apply to any repairs or other works as are required to the Crossrail Tunnels to remedy any damage caused by or as a consequence of the Works and which, in respect of such damage caused by ground movement, is iden fied immediately a er the movements exceeding predic ons within the Ground Movement Impact Assessment have occurred (and in any event during the Demoli on Period) or iden fied by the Post-Demoli on Survey The obliga ons of the Developer contained in clauses 3.9 to 3.11 (inclusive) shall expire and be of no further effect upon the achievement of the Agreed Stability Acceptance Criteria.
3.15
[Unless Cl 4.9 is exercised and upon reaching Crossrail Handover Date, 3.15.1
all obliga ons for implementa on of the Tunnel Monitoring Plan shall transfer from CRL and its contractors to the Developer and its contractors
3.15.2
the Developer shall procure all licenses and permissions from Transport for London or any other en ty that will be responsible for the opera on and maintenance of the Crossrail Tunnels and the Developer shall reimburse these en es for all their reasonable costs incurred in order to con nue implemen ng the Tunnel Monitoring Plan and to provide data and Monitoring Results Interpreta on reports to persons nominated to review and accept these on behalf of Transport for London or any other en ty that will be responsible for the opera on and maintenance of the Crossrail Tunnels]
4.
CRL’s OBLIGATIONS
4.1
CRL shall procure the implementa on of the Tunnel Monitoring Plan by the Monitoring Contractor throughout the Development Period in accordance with the requirements set out in that plan (which shall include, subject to clause 4.4, the installa on, maintenance and repair of the Monitoring Equipment and the obtaining of the Monitoring Data from the Monitoring Contractor) in consulta on with the Developer and in any event prior to the start of the Works.
4.2
Subject to clause 4.4, CRL shall procure that all Monitoring Data resul ng from automated monitoring is provided to the Developer in real- me through dedicated so ware [or insert format agreed]
4.3
Subject to clause 4.4, CRL shall enforce the terms of the contract it has with the Monitoring Contractor so as to ensure that the Monitoring Contractor properly maintains the Monitoring Equipment and keeps the same in good repair and working order from the installa on of the said Monitoring Equipment and
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throughout the Development Period and CRL shall be responsible for the cost of repairing or replacing any part of the Monitoring Equipment that is damaged by in-tunnel construc on or other ac vi es carried out by CRL and/or its contractors and opera on of Crossrail and CRL shall use reasonable endeavours to procure that such repair and/or replacement of the Monitoring Equipment shall be carried out as soon as reasonably prac cable 4.4
The Developer accepts that there may be occasions when in-tunnel construc on ac vi es may need to take priority over monitoring of the Crossrail Tunnels in accordance with this Agreement. During such periods of disrup on CRL will work with the Developer to obtain early warning of cri cal works so that con ngency plans can be made to reasonably reduce any period or periods during which monitoring may not be possible,
4.5
CRL shall not be responsible for or have any liability in connec on with the accuracy of the results of the Monitoring Data
4.6 4.7
[CRL shall give the Developer 6 months’ wri en no ce of the Crossrail Handover Date Subject to the exercising of Cl 4.9 and pursuant to 3.15, CRL shall facilitate discussions between the developer and Transport for London or any other en ty that will be responsible for the opera on and maintenance of the Crossrail Tunnels to enable as far as reasonable a seamless transfer of monitoring obliga ons from CRL to the Developer upon Handover.
4.8
[At any me prior to the Crossrail Handover Date CRL may wish to transfer its en re rights, obliga ons and liabili es under this Agreement and the appointment of the Monitoring Contractor by way of nova on or statutory transfer scheme to Transport for London or any other en ty that will be responsible for the opera on and maintenance of the Crossrail Tunnels and in the event of a nova on and upon giving the Developer no ce in wri ng of such inten on the Developer shall at no cost to it be required to enter into a deed of nova on in a form submi ed to it by CRL ]]
5.
COSTS
5.1
Subject to clause 5.5 and without prejudice to any right the Developer may have to seek reimbursement of such costs as part of any claim for compensa on pursuant to the Land Compensa on Act 1961 and the Compulsory Purchase Act 1965 (as amended) in connec on with the construc on of the Crossrail Tunnels or any future claim to compensa on, the Developer shall be responsible for CRL’s reasonable and properly incurred costs in connec on with the following: 5.1.1
[insert scopes e.g.] reviewing and agreeing the Ground Movement Impact Assessment, Developer’s Monitoring Plan, Tunnel Monitoring Plan and the Monitoring Ac on Plan up to a maximum of £[insert value];
5.1.2
facilita ng undertaking and agreement of the Pre-construc on Survey, and the Postconstruc on Survey and any other interim condi on surveys undertaken pursuant to clause [2.7] (except where any such interim condi on survey is requested by CRL and the survey report concludes or implies that the Crossrail Tunnels have not moved materially as a result of the Works) up to a maximum sum of £[3,000] per survey;
5.1.3
clause 4 including undertaking (or procuring the undertaking of) monitoring in accordance with the Tunnel Monitoring Plan including the supply, installa on, maintenance, repair, renewal and/or removal of the Monitoring Equipment and provision of the Monitoring Data to the Developer, the costs of CRL’s tunnel contractor’s site briefings and site induc on charges up to a maximum sum of £[insert accepted CRL Contractor’s monitoring quota on];
5.1.4
any costs incurred by CRL pursuant to clause 3.12; and
5.1.5
those ma ers that arise as a direct consequence of this Agreement and CRL’s obliga on to
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maintain the Monitoring Equipment upon the occurrence of the events set out in the [Risk Con ngency Es mate to cover eventuali es not accounted for in the CRL Contractor’s monitoring quota on] table of the Tunnel Monitoring Plan up to a maximum sum of £[insert es mate] 5.2
CRL will use reasonable endeavours to no fy the Developer in wri ng within five Working Days of any costs and expenses it occurs pursuant to clause 5.1 but for the avoidance of doubt any failure to do so by CRL shall not affect recovery of such costs under this clause
5.3
The Developer shall pay the costs set out at clause 5.1 above to CRL within 20 Working Days of receipt of valid VAT invoices made out to the Developer and payable to CRL
5.4
The obliga ons in this clause extend to reasonable and proper costs and disbursements assessed on a full indemnity basis and to any value added tax in respect of those costs and disbursements except to the extent that the CRL is able to recover that value added tax and in this regard CRL shall recover value added tax where it is recoverable and the Developer shall not be liable for such value added tax in such circumstances
5.5
Neither party shall be liable for any costs, liabili es, losses or expenses suffered or incurred by the other party to the extent that the same are incurred as a result of or in connec on with the other party’s negligence or breach of this Agreement
5.6
Each party shall at all mes take all reasonable steps to prevent and mi gate any cost, loss, claim or liability (whether indemnified or not) which it suffers as a result of the other party’s negligence or breach of this Agreement
5.7
Within 21 working days upon reaching the Handover date CRL shall reconcile all reasonable costs incurred against payments received in advance and shall return any monies not spent back to the Developer.
6.
INSURANCE
6.1
The Developer shall procure that pursuant to any building contract it enters with a contractor or contractors for the carrying out of the Works (other than for so strip or demoli on work) the contractor or contractors shall be obliged all mes during the carrying out of the Works to effect and maintain public liability insurance for an amount not less than £25,000,000 (twenty-five million pounds) in respect of each and every claim or series of claims for property damage, death or personal injury.
6.2
[The Developer shall use its reasonable endeavours to procure that pursuant to any appointment of a consultant appointed by it having a material design responsibility in respect of the Works such consultant shall be obliged to maintain professional indemnity cover in a sum not less than £5,000,000 (five million pounds) in respect of each and every claim or series of claims (subject to aggregate limits applying for all claims arising out of or in connec on with asbestos and pollu on/contamina on).]
6.3
Upon wri en request from CRL the Developer shall procure wri en evidence of the insurances referred to in clauses 6.1 and 6.2.
6.4
[CRL shall use its reasonable endeavours to procure that pursuant to any contract it enters into with the Monitoring Contractor or any other person for the carrying out of the monitoring contemplated in this Agreement such person shall be obliged to maintain professional indemnity cover in a sum not less than £5,000,000 (five million pounds) in respect of each and every claim or series of claims arising out of the one event
6.5
Upon wri en request from the Developer, CRL shall procure wri en evidence of the insurances referred to in clause 6.4.
7.
WARRANTY
7.1
[(if required) CRL shall procure the delivery by the Monitoring Contractor of a collateral warranty in the form a ached at Appendix 1 in favour of the Developer prior to the start of the Phase 2 Works.]
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8.
NOTICES
8.1
Any no ce served under this Agreement is to be:
Appendix B
8.1.1
in wri ng;
8.1.2
signed by an officer of the party serving the no ce or by its solicitors;
8.1.3
delivered by hand, first class post, pre-paid or recorded delivery or fax at the address of the party on whom it is served set out above or such other address which they may no fy in wri ng to the other par es at any me and:(a)
to the Developer at: [insert Development company and correspondence address] [Insert Developer’s Representa ve Contact details]
(b)
to CRL at: c/o 3rd Party Development Manager 25 Canada Square Canary Wharf London E14 5LQ Telephone Number: 0203 2299600 E-mail Address: geoff
[email protected] Marked for the a en on of the Geoff Rankin
8.2
If a no ce is received a er 4.00 pm on a working day, or on a day which is not a working day, it is to be treated as having been received on the next working day
8.3
Unless the me of actual receipt is proved, a no ce served by the following means is to be treated as having been received:
9.
8.3.1
if delivered by hand, at the me of delivery;
8.3.2
if sent by post, on the second working day a er pos ng; or
8.3.3
if sent by fax, at the me of transmission
APPROVALS Any discre on CRL may have under this Agreement is to be exercised reasonably and without undue delay and CRL shall give wri en reasons for its decisions if requested by the Developer, save that it is acknowledged by the Developer that CRL shall have sole and unfe ered discre on in respect of all decisions concerning the safety of the Crossrail Tunnels PROVIDED THAT in respect of any decisions proposed by CRL (including those pertaining to safety ma ers) CRL shall give the Developer the opportunity to comment on such proposed decisions and shall take into account any relevant comments of the Developer before making the relevant decision
10.
DISPUTES
10.1
If a dispute arises out of or in connec on with this agreement or the performance, validity or enforceability of it (other than a dispute rela ng to the safety and/or opera on of the Crossrail Tunnels in respect of which CRL shall have sole discre on) (“Dispute”) then the par es shall follow the procedure set out in this clause:
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10.1.1
either party shall give to the other wri en no ce of the Dispute, se ng out its nature and full par culars (“Dispute No ce”), together with relevant suppor ng documents. On service of the Dispute No ce, the 3rd Party Developments Manager of CRL and [] of the Developer shall a empt in good faith to resolve the Dispute;
10.1.2
if the 3rd Party Developments Manager of CRL and [] of the Developer are for any reason unable to resolve the Dispute within 15 days of service of the Dispute No ce, the Dispute shall be referred to the Chief Engineer of CRL and [of the Developer] who shall a empt in good faith to resolve it; and
10.1.3
if the Chief Engineer of CRL and of the Developer are for any reason unable to resolve the Dispute within 15 days of it being referred to them, the par es will a empt to se le it by media on in accordance with the CEDR Model Media on Procedure. Unless otherwise agreed between the par es, the mediator shall be nominated by CEDR Solve. To ini ate the media on, a party must serve no ce in wri ng (“ADR No ce”) to the other party to the Dispute, reques ng media on. A copy of the ADR No ce should be sent to CEDR Solve. The media on will start not later than 10 days a er the date of the ADR No ce
10.2
No party may commence any court proceedings under clause 10.3 in rela on to the whole or part of the Dispute un l 30 days a er service of the ADR No ce, provided that the right to issue proceedings is not prejudiced by a delay
10.3
If the Dispute is not resolved within 30 days a er service of the ADR No ce, or either party fails to par cipate or to con nue to par cipate in the media on before the expira on of the said period of 30 days, or the media on terminates before the expira on of the said period of 30 days, the Dispute shall be finally resolved by the courts of England and Wales
11.
ENFORCEMENT
11.1
This Agreement is to be governed by and interpreted in accordance with English law
11.2
Subject to clause 10, the courts of England are to have jurisdic on in rela on to any disputes between the par es arising out of or related to this Agreement
11.3
All addi ons, amendments and varia ons to this Agreement shall be binding only if in wri ng and signed by duly authorised representa ves by both par es
11.4
If any provision of this Agreement shall be held to be void, illegal, invalid or unenforceable in whole or in part under any enactment or rule of law, such provision or part shall to that extent be deemed not to form part of this Agreement but the legality, validity and enforceability of the remainder of this Agreement shall not be affected
11.5
No waiver by either Party or any default by the other Party in the performance of any of the provisions of this Agreement shall operate or be construed as a waiver of any other or further default whether of a like or different character. The failure to exercise or delay in exercising a right or remedy under this Agreement shall not cons tute a waiver or the right or remedy or a waiver of any other rights or remedies. No single or par al exercise of any right or remedy under this Agreement shall prevent any further exercise of the right or remedy or the exercise of any other right or remedy
11.6
The par es agree to keep the terms of this Agreement, the Development Monitoring Plan, the Tunnel Monitoring Plan, the Ground Movement Impact Assessment, Monitoring Data and any other commercial financial, technical or confiden al informa on disclosed before or a er the date of this Agreement confiden al
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EXECUTION CRL and the Developer have executed this Agreement under hand with effect from the date set out in the Par culars Signed by for and on behalf of Crossrail Limited: Signed by for and on behalf of [insert Developer]: Signed by for and on behalf [Developer]:
APPENDIX 1 Monitoring Contractor’s Collateral Warranty
APPENDIX 2 Developer’s Monitoring Plan Appendix 3 Tunnel Monitoring Plan
APPENDIX 4 Monitoring AcƟon Plan
APPENDIX 5 Preliminary Ground Movement Impact Assessment
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Crossrail Ltd is a fully owned subsidiary of Transport for London. Helpdesk E-mail Websites
0345 602 3813 (24-hours, 7-days a week)
[email protected] www.crossrail.co.uk
Crossrail Limited 25 Canada Square London E14 5LQ
