Piling Specification


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Durkan Ltd

Specification for Piling and Associated Works Union Road, Clapham, London SW4 131979

MAY 2013

RSK GENERAL NOTES Project No.:

131979

Title:

Specification for Piling and Associated Works

Client:

Durkan Ltd

Date:

May 2013

Office:

Hemel Hempstead

Status:

Final

Author

Charlotte Edis

Signature

Technical reviewer

Paul Murphy

Signature

Date:

August 2012

Project manager

Paul Murphy

Date:

August 2012

Signature Date:

May 2013

RSK LDE (RSK) has prepared this report for the sole use of the client, showing reasonable skill and care, for the intended purposes as stated in the agreement under which this work was completed. The report may not be relied upon by any other party without the express agreement of the client and RSK. No other warranty, expressed or implied, is made as to the professional advice included in this report. Where any data supplied by the client or from other sources have been used, it has been assumed that the information is correct. No responsibility can be accepted by RSK for inaccuracies in the data supplied by any other party. The conclusions and recommendations in this report are based on the assumption that all relevant information has been supplied by those bodies from whom it was requested. No part of this report may be copied or duplicated without the express permission of RSK and the party for whom it was prepared. Where field investigations have been carried out, these have been restricted to a level of detail required to achieve the stated objectives of the work. This work has been undertaken in accordance with the quality management system of RSK LDE.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

CONTENTS INDEX .....................................................................................................................................................1 A DEFINITIONS, STANDARDS AND REGULATIONS ......................................................................4 A.1 THE CONTRACTOR, THE TENDERER, THE SUBCONTRACTOR, THE CONSULTING ENGINEER...............................................................................................................................4 A.2 BRITISH STANDARDS AND BS CODES OF PRACTICE: .....................................................4 A.3 APPROVAL: .............................................................................................................................4 A.4 CONSTRUCTION REGULATIONS:.........................................................................................4 B SCOPE OF WORKS AND GENERAL SPECIFICATION................................................................5 B.1 SCOPE OF THE WORKS: .......................................................................................................5 B.2 TYPES OF PILE; GENERAL DESCRIPTION:.........................................................................5 B.3 SITE AND GROUND CONDITIONS: .......................................................................................5 B.4 MANMADE OBSTRUCTIONS: ................................................................................................5 B.5 MINOR NATURAL OBSTRUCTIONS: .....................................................................................5 B.6 GROUND LEVEL: ....................................................................................................................5 B.7 CUT OFF LEVEL:.....................................................................................................................6 B.8 TRIMMING: ..............................................................................................................................6 B.9 BORE CASING:........................................................................................................................6 B.10 POSITIONAL TOLERANCES: .................................................................................................6 B.11 TOLERANCE FOR PRECAST CONCRETE PILES: ...............................................................7 B.12 CONTINUOUS FLIGHT AUGER PILES: .................................................................................7 B.13 REINFORCEMENT (PROJECTION): ......................................................................................7 B.14 COVER TO REINFORCEMENT: .............................................................................................7 B.15 WORKMANSHIP AND SUPERVISION:...................................................................................7 B.16 TENDER:..................................................................................................................................7 B.17 PILE LENGTH FOR PAYMENT: ..............................................................................................8 C SCOPE OF WORKS AND SITE SPECIFIC SPECIFICATION........................................................9 C.1 ACCESS:..................................................................................................................................9 C.2 INFORMATION: .......................................................................................................................9 C.3 PILE TYPE AND NUMBER: .....................................................................................................9 C.4 FACTOR OF SAFETY:.............................................................................................................9 C.5 DEPTH OF MADE GROUND:..................................................................................................9 C.6 CUT-OFF LEVEL:.....................................................................................................................9 C.7 LOADINGS: ..............................................................................................................................9 C.8 SETTLEMENT:.......................................................................................................................10 C.9 MINIMUM SIZE AND LENGTH OF REINFORCEMENT: ......................................................10 C.10 MINIMUM PERCENTAGE OF REINFORCEMENT:..............................................................10 C.11 CONFIRMATION OF DESIGN BY PILE TEST:.....................................................................10 C.12 NUMBER OF VISITS:.............................................................................................................10 C.13 CONTACT FOR SITE VISIT: .................................................................................................10 D DESIGN ..........................................................................................................................................11 D.1 PILE LAYOUT: .......................................................................................................................11 D.2 SUBCONTRACTOR'S DESIGN RESPONSIBILITY: .............................................................11 D.3 FACTOR OF SAFETY:...........................................................................................................11 Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

E

F

G

H I

D.4 DESIGN OF REINFORCEMENT: ..........................................................................................11 D.5 DESIGN OF CONCRETE MIX: ..............................................................................................11 D.6 SETTLEMENT:.......................................................................................................................11 D.7 APPROVAL OF DESIGN: ......................................................................................................12 MATERIALS...................................................................................................................................13 E.1 STANDARDS AND QUALITY: ...............................................................................................13 E.2 CONCRETE MIX: ...................................................................................................................13 E.3 CONCRETE TO BE PLACED UNDER WATER: ...................................................................13 E.4 ADMIXTURES FOR CONCRETE: .........................................................................................13 E.5 READY MIXED CONCRETE: ................................................................................................13 E.6 CONCRETE COMPLIANCE: .................................................................................................13 E.7 REINFORCEMENT: ...............................................................................................................14 E.8 STORAGE AND HANDLING OF MATERIALS: .....................................................................14 E.9 INSPECTION OF MATERIALS: .............................................................................................14 PROGRAMME AND METHOD ......................................................................................................15 F.1 PROGRAMME:.......................................................................................................................15 F.2 METHOD: ...............................................................................................................................15 F.3 APPROVAL: ...........................................................................................................................15 TESTING PROCEDURES AND STANDARDS .............................................................................16 G.1 GENERAL: .............................................................................................................................16 G.2 PRELIMINARY AND /OR WORKING PILE LOAD TESTS: ...................................................16 G.3 INTEGRITY PILE TESTING:..................................................................................................16 G.4 ACCEPTABLE TEST RESULTS:...........................................................................................16 G.5 UNSATISFACTORY PILE TEST RESULTS: .........................................................................17 G.6 PREPARATION OF PILE HEAD FOR TESTING: .................................................................17 G.7 TEST LOAD AND LOAD MEASUREMENT:..........................................................................17 G.8 TEST LOAD REACTION:.......................................................................................................17 G.9 MEASURING PILE MOVEMENTS:........................................................................................17 G.10 LOADING PROCEDURE: ......................................................................................................18 G.11 RECORD OF PILE TEST DATA: ...........................................................................................19 CARE AND PROTECTION ............................................................................................................21 H.1 ADJACENT PROPERTY AND EXISTING SERVICES:.........................................................21 SITE PRACTICE ............................................................................................................................22 I.1 SUPERVISION: ......................................................................................................................22 I.2 SAFETY:.................................................................................................................................22 I.3 PILING RECORDS:................................................................................................................22 I.4 SETTING OUT: ......................................................................................................................23 I.5 EXCAVATION: .......................................................................................................................23 I.6 SPOIL ARISING FROM BORINGS:.......................................................................................23 I.7 SOIL SAMPLES: ....................................................................................................................23 I.8 CHANGE IN SUB-SOIL AND ANY OTHER CONDITIONS: ..................................................23 I.9 INGRESS OF WATER: ..........................................................................................................23 I.10 BENTONITE: ..........................................................................................................................24 I.11 INSPECTION:.........................................................................................................................24 I.12 CONCRETING: ......................................................................................................................24 I.13 CONTINUOUS FLIGHT AUGER PILES: ...............................................................................24

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

I.14 COLD WEATHER CONCRETING: ........................................................................................24 I.15 CONCRETE TESTING:..........................................................................................................25 I.16 UNFILLED BORES:................................................................................................................25 I.17 PRECAST CONCRETE PILES: .............................................................................................25 I.18 DAMAGED SHELLS OR LINERS: .........................................................................................25 I.19 LENGTHENING STEEL PILES:.............................................................................................25 I.20 LENGTHENING CONCRETE DRIVEN PILES: .....................................................................25 I.21 DRIVING:................................................................................................................................26 I.22 PILE SUPPORT DURING DRIVING: .....................................................................................26 I.23 CLOSENESS OF PILES: .......................................................................................................26 I.24 PREBORING: .........................................................................................................................26 I.25 JETTING:................................................................................................................................26 I.26 RISEN PILES: ........................................................................................................................26 I.27 TRIMMING: ............................................................................................................................26 I.28 CLEARING UP: ......................................................................................................................27 APPENDIX A ........................................................................................................................................28 APPENDIX B ........................................................................................................................................30

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

INDEX A. DEFINITIONS, STANDARDS AND REGULATIONS A.1 A.2 A.3 A.4

THE CONTRACTOR, THE TENDERER, THE SUBCONTRACTOR, THE CONSULTING ENGINEER. BRITISH STANDARDS AND BS CODES OF PRACTICE APPROVAL APPROVAL CONSTRUCTION REGULATIONS

B. SCOPE OF WORKS AND SPECIFICATION - GENERAL B.1 B.2 B.3 B.4 B.5 B.6 B.7 B.8 B.9 B.10 B.11 B.12 B.13 B.14 B.15 B.16 B.17

SCOPE OF WORKS TYPES OF PILE: GENERAL DESCRIPTION SITE AND GROUND CONDITIONS MANMADE OBSTRUCTIONS MINOR NATURAL OBSTRUCTIONS GROUND LEVEL CUT OFF LEVEL TRIMMING BORE CASING POSITIONAL TOLERANCES TOLERANCES FOR PRECAST CONCRETE PILES CONTINUOUS FLIGHT AUGER PILES REINFORCEMENT (PROJECTION) COVER TO REINFORCEMENT WORKMANSHIP AND SUPERVISION TENDER PILE LENGTH FOR PAYMENT

C. SCOPE OF WORKS SPECIFICATION - SITE SPECIFIC C.1 C.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9 C.10 C.11 C.12 C.13

ACCESS INFORMATION PILE TYPE AND NUMBER FACTOR OF SAFETY DEPTH OF MADE GROUND CUT-OFF LEVEL LOADINGS SETTLEMENT MINIMUM SIZE AND LENGTH OF REINFORCEMENT MINIMUM PERCENTAGE OF REINFORCEMENT CONFIRMATION OF DESIGN OF PILE TEST NUMBER OF VISITS CONTACT FOR TECHNICAL MATTERS

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

C.14 C.15

CONTACT FOR CONTRACTUAL MATTERS CONTACT FOR SITE VISIT

D.1 D.2 D.3 D.4 D.5 D.6 D.7

PILE LAYOUT SUBCONTRACTOR'S DESIGN RESPONSIBILITY FACTOR OF SAFETY DESIGN OF REINFORCEMENT DESIGN OF CONCRETE MIX SETTLEMENT APPROVAL OF DESIGN

E.1 E.2 E.3 E.4 E.5 E.6 E.7 E.8 E.9

STANDARDS AND QUALITY CONCRETE MIX CONCRETE TO BE PLACED UNDER WATER ADMIXTURES FOR CONCRETE READY MIX CONCRETE CONCRETE COMPLIANCE REINFORCEMENT STORAGE AND HANDLING OF MATERIALS INSPECTION OF MATERIALS

D. DESIGN

E. MATERIALS

F. PROGRAMME AND METHOD F.1 F.2 F.3

PROGRAMME METHOD APPROVAL

G. TESTING PROCEDURES AND STANDARDS G.1 G.2 G.3 G.4 G.5 G.6 G.7 G.8 G.9 G.10 G.11

GENERAL PRELIMINARY AND/OR WORKING PILE LOAD TESTS INTEGRITY PILE TESTING ACCEPTABLE TEST RESULTS UNSATISFACTORY PILE TEST RESULTS PREPARATION OF PILE HEAD FOR TESTING TEST LOAD AND LOAD MEASUREMENT TEST LOAD REACTION MEASURING PILE MOVEMENTS LOADING PROCEDURE RECORD OF PILE TEST DATA

H. CARE AND PROTECTION H.1

ADJACENT PROPERTY AND EXISTING SERVICES

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

I. SITE PRACTICE I.1 SUPERVISION I.2 SAFETY I.3 PILING RECORDS I.4 SETTING OUT I.5 EXCAVATION I.6 SPOIL ARISING FROM BORINGS I.7 SOIL SAMPLES I.8 CHANGE IN SUB-SOIL AND ANY OTHER CONDITIONS I.9 INGRESS OF WATER I.10 BENTONITE I.11 INSPECTION I.12 CONCRETING I.13 CONTINUOUS FLIGHT AUGER PILES I.14 COLD WEATHER CONCRETING I.15 CONCRETE TESTING I.16 UNFILLED BORES I.17 PRECAST CONCRETE PILES I.18 DAMAGED SHELLS OR LINERS I.19 LENGTHENING STEEL PILES I.20 LENGTHENING CONCRETE DRIVEN PILES I.21 DRIVING I.22 PILE SUPPORT DURING DRIVING I.23 CLOSENESS OF PILES I.24 PREBORING I.25 JETTING I.26 RISEN PILES I.27 TRIMMING I.28 CLEARING UP APPENDIX A PILING RECORD SHEET APPENDIX B TENDER SUMMARY SHEETS

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

A

DEFINITIONS, REGULATIONS

STANDARDS

A.1

THE CONTRACTOR, THE TENDERER, THE SUBCONTRACTOR, THE CONSULTING ENGINEER.

AND

"The Contractor" is Durkan Ltd. "The Tenderer" is the person or firm tendering for piling at the Contractor's invitation. "The Subcontractor" is the person or firm appointed by the contractor to carry out the piling work. "The Consulting Engineer" (C.E.) is RSK Land & Development Engineering Ltd.

A.2

BRITISH STANDARDS AND BS CODES OF PRACTICE: All materials, workmanship, design and practice must be in accordance with the appropriate current British Standard or BS Code of Practice, and in particular with BS 8004 and BS 5228 Pt4 Vibration from driven piles. In those instances where this specification requires a higher standard, this is indicated in the text and takes precedence over the relevant British Standard or BS Code of Practice. For the purpose of this Clause, "current" means the edition current ten days before the date of the Contractor's Invitation to tender, with any supplements, addenda and amendments that applied at that time.

A.3

APPROVAL: The terms "approved" refer to approvals given in writing by the Contractor or the C.E..

A.4

CONSTRUCTION REGULATIONS: The Subcontractor must carry out all work in accordance with the requirements of the Health and Safety at Work, etc Act, 1974, and any other relevant legislation including the regulations of any authority competent to deal with matters of safety, health and welfare applicable to his work. He must also comply with the Contractor's general policy in these matters as instructed by the Contractor's authorised representative.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

B

SCOPE OF WORKS SPECIFICATION

B.1

SCOPE OF THE WORKS:

AND

GENERAL

The Subcontractor is responsible for designing the piles, for providing his calculations for approval, for supplying labour, materials and plant to install piles and for providing test facilities and carrying out tests to the Contractor's satisfaction. The Tenderer is to supply details of his piling method, basic design calculations and specification of materials with his Tender.

B.2

TYPES OF PILE; GENERAL DESCRIPTION: a)

b)

B.3

"Driven piles" include permanent loadbearing piles, as follows: - Precast concrete piles; - Cast in place piles formed by close-ended driven steel tubes. - Cast in place piles formed by open-ended steel tubes without enlarged bases. "Bored piles" are concrete piles cast in place in bores excavated by auger, grab or shell bit.

SITE AND GROUND CONDITIONS: The Tenderer must visit and inspect the site to satisfy himself of the accuracy and adequacy of any Soil or Borehole Report made available to him by the Contractor. He will be deemed to have made allowance in his Tender for such Reports and all viable features of the site, including any relevant features or conditions outside the site boundary.

B.4

MANMADE OBSTRUCTIONS: The Contractor will break up and remove any surface finishes, underbuildings, foundations, disused manholes and concrete associated drains or service ducts which will affect the piling.

B.5

MINOR NATURAL OBSTRUCTIONS: The piling method proposed by the Tenderer must be suitable for the ground conditions indicated and able to overcome minor natural obstructions such as cobbles or small boulders.

B.6

GROUND LEVEL: Unless otherwise indicated the Tenderer should assume that piling would be carried out at existing ground level. Should any piling platforms etc be required then this

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

should be notified at the time of Tender ref. Clause B.16.b

B.7

CUT OFF LEVEL: The cut-off level shown on the drawings is the level to which the completed pile will be trimmed. Ground levels will normally be raised to at least the pile cut-off levels before piling commences. Where the trimmed level of any pile is below natural or reduced ground level when the pile is being formed, the depth of excavation to the trimmed level will be measured as a credit item for unconcreted shaft. Generally, cast in place piles must be concreted to 300mm above cut-off level within a tolerance of ± 150mm. If the Tenderer considers this impracticable (for instance, in the case of CFA piles) he is to indicate so in his Tender. If concrete piles are to be cast in place with a cut-off level at or above working surface level, the Subcontractor must finish them to the highest practicable level. If this is below the height specified above, the Contractor will carry out the remaining concrete work, but the Tenderer should indicate in his Tender the likely extent of this work. The Subcontractor must ensure that the correct length of reinforcement projects above cutoff level.

B.8

TRIMMING: Pile trimming will be carried out with due care by others, using suitable power tools. Trimming may not commence until the time lapse specified by the Piling Contractor has been achieved. Trimming to commence with a 25mm deep chase cut out all around the side of the pile then breaking out from the top. If the concrete at cut-off level is found to be unsound, trimming will be continued until sound concrete is encountered across the full cross section of the pile, which the Contractor will then make a good to cut-off level and counter-charge to the Subcontractor.

B.9

BORE CASING: When boring through non-cohesive, soft cohesive or water bearing strata, or any other material which is liable to collapse, the Subcontractor must use temporary casing or other suitable techniques to stabilise the shaft walls. Such temporary casing must extend far enough below such strata to seal off adequately the unstable areas. Open bored piles must always incorporate a length of casing set firmly in the ground at the top of the bore. This temporary casing must not be less than 2 metres in length and may be extracted as soon as the concrete has been placed. By agreement with the C.E. casings may be omitted in ground where there is no likelihood of collapse, contamination to concrete or difficulty in checking the centre of the bore.

B.10 POSITIONAL TOLERANCES: The centre of the head of each pile at piling platform level, measured with respect to the permanent setting out points must be within 75mm of its specified position. Piles intended to be vertical must not be out of plumb by more than 1 in 75. Raking piles must not deviate from their specified rake by more than 1 in 25 where raking up to 1 in 6, and 1 in 15 where raking more than 1 in 6. Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

If the above tolerances are exceeded, the Subcontractor must inform the Contractor and the C.E. as quickly as possible. The forcible correction of piles outside the tolerance will not be permitted.

B.11 TOLERANCE FOR PRECAST CONCRETE PILES: The cross sectional dimensions may not deviate by more than +6mm or -3mm from those specified. No face of a pile may deviate by more than 6mm under a 3m straight edge.

B.12 CONTINUOUS FLIGHT AUGER PILES: If the Subcontractor is instructed to install CFA piles, the following clauses of this Specification will not apply. B.9, I.11, I.16 to I.22 inclusive and I.26. The following Clauses are amended: Clause I.5: omit "exposed to the atmosphere, or," and the whole of paragraph 2. Clause I.12: omit "after the bore has been inspected," and the whole of the sentence "In no circumstances.......... hours".

B.13 REINFORCEMENT (PROJECTION): The length of reinforcement left projecting from piles must be within + 200mm or – 0mm of the specified dimension.

B.14 COVER TO REINFORCEMENT: For cast insitu uncased concrete piles, the Subcontractor must maintain a minimum cover of 75mm, and for precast or permanently cased concrete piles 40mm. His proposals for achieving this cover must be submitted for approval before commencement of the work.

B.15 WORKMANSHIP AND SUPERVISION: It is the responsibility of the Subcontractor to achieve workmanship of the quality necessary to implement the specified and approved design in the actual conditions encountered. To this end, he must ensure that the work is directly supervised at all times by a competent person with appropriate experience and training.

B.16 TENDER: The Tenderer is to include the following within his Tender: a) The attached summary sheets duly completed. b) An indication of any special requirements needed, such as a hardcore carpet over the working area, access roads, storage space, etc. c) All rates needed to determine the costs of extra length of pile or reduced length of pile different from those assumed in the Tender. Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

d) e)

If continuous flight auger piling is proposed, for carrying out integrity testing on piles as specified in clause G.3. If enlarged bases are proposed, the cost of such enlargement.

B.17 PILE LENGTH FOR PAYMENT: For the purpose of payment, the length of each pile will be the distance from the working ground level from which the pile is being formed to the bottom of the permanent or temporary casing (where used) or to the toe of the pile. Payment over and above such length of pile for enlarged bases will only be made if they are indicated in the Tenderer's design proposals and priced in the Tender.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

C

SCOPE OF WORKS AND SITE SPECIFIC SPECIFICATION Schedule for the development at:

4- 14 Union Point, 342 – 344 Clapham Road, Clapham, SW9

C.1

ACCESS: From Union Point and Clapham Road.

C.2

INFORMATION: Drawings: Refer to RSK’s Structural Issue Sheet. Site Investigation: CARD Geotechnics Geotechnical Interpretative Report, dated December 2003, RSK Environment Ltd Supplementary Geoenvironmental Investigation letter

report (ref: 371057 – L02 (00)), RSK Environment Ltd Interpretative Geotechnical Review letter report (ref: 371057 – 01 (00)).

C.3

PILE TYPE AND NUMBER: CFA pile and refer to RSK Structural drawings for pile numbers.

C.4

FACTOR OF SAFETY: 2.5 or 3 (Testing regime to be agreed with LA) (Also refer to Appendix B)

C.5

DEPTH OF MADE GROUND: Refer to Site Investigation report.

C.6

CUT-OFF LEVEL: Refer to RSK Structural Drawings.

C.7

LOADINGS: Refer to RSK Structural Drawings

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

C.8

SETTLEMENT: Refer to clause D.6

C.9

MINIMUM SIZE AND LENGTH OF REINFORCEMENT: 6 B12 min. for short length piles only and 4 B16 min. for pile depths of 6m or greater, with B8 helical binders. Typically the min length of reinforcement is depth of fill plus 2m, but should be increased in compliance with design requirements for tension anchorage due to heave etc.

C.10 MINIMUM PERCENTAGE OF REINFORCEMENT: Typically the minimum percentage of reinforcement in the piles subject to tension will be 2 High Yield (fy = 500 N/mm ) 0.45% of the gross cross-sectional area. For piles subject to compression this will be 0.4% of the gross cross sectional area for either type of steel.

C.11 CONFIRMATION OF DESIGN BY PILE TEST: The Tenderer must state the method and the unit cost of carrying out preliminary and working pile tests based on the following approximate number of tests: Preliminary Refer to RSK Structural Drawings, and should agreed with LA. Working Pile 1: 100 (should be agreed with LA).

C.12

NUMBER OF VISITS:

CONTACT FOR TECHNICAL MATTERS: Paul Murphy RSK Land & Development Engineering Ltd Tel: 01442 437578 Fax: 01442 437550 CONTACT FOR CONTRACTUAL MATTERS: Alex Neate Tel: 020 8357 4519 Fax: 020 8357 5050 M: 07718 118276

C.13 CONTACT FOR SITE VISIT: Alex Neate

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

D

DESIGN

D.1

PILE LAYOUT: Generally the pile layout will be determined in advance and shown in the Tender drawings. However, if this is not the case, the Tender documents will include a drawing showing the location and value of forces and moments to be carried by the piles. The Tenderer (subsequently the Subcontractor) will be responsible for determining an economical and satisfactory arrangement of piles, as well as for designing the piles.

D.2

SUBCONTRACTOR'S DESIGN RESPONSIBILITY: The Subcontractor will be responsible for the design of piles adequate in cross section and length to satisfy local conditions, loading criteria and specified factors of safety. His responsibility includes the choice of the appropriate method, sequence of operations and equipment, bearing in mind ground conditions, cavities and water in the ground, and making due allowance for any heave, lifting or lateral displacement. If his design includes precast concrete piles, he must include lifting holes or eyes to withstand handling, driving and service stresses.

D.3

FACTOR OF SAFETY: The factor of safety is the ultimate load bearing capacity of the piles as defined in Section G divided by the maximum value of combined dead and live loading. Where piles are in a group, the safe working load of any pile or piles in the group will be reduced if necessary so that the factor of safety of the group as a whole is not less than 2.

D.4

DESIGN OF REINFORCEMENT: Reinforcement cages must be robust enough to prevent permanent distortion during handling, and to maintain position and cover during concreting. Welding of joints and welding procedures must be carried out in accordance with BS 5135. The reinforcement for concrete piles cast in place must be designed so that the vertical bars project above cut off level either by 600mm or by the length of a full tension lap, whichever is greater.

D.5

DESIGN OF CONCRETE MIX: The concrete mix must be appropriate and compatible with all other criteria determining and dependent on the design. The workability must be specified.

D.6

SETTLEMENT: Settlement of any pile must not exceed 6mm under working load. If ground conditions, loadings and other criteria indicate a design in which settlement is likely to exceed 6mm, all relevant information, including the anticipated settlement must be included with the design

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

proposal. Alternative designs using modified criteria may also be submitted.

D.7

APPROVAL OF DESIGN: Before starting to install piles the Subcontractor must submit his pile designs, concrete mix designs, calculations and drawings to the C.E. for his approval and that of the officer responsible for statutory approval. Such approval does not relieve the Subcontractor of his responsibility for the work.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

E

MATERIALS

E.1

STANDARDS AND QUALITY: a)

All materials (cement, pulverised fuel ash, ground. granulated blast furnace slag, fine and coarse aggregate, steel reinforcement, steel plate and steel section) must comply with the appropriate British Standard. b) Ready mixed concrete must comply with quality scheme for ready mixed concrete (QSRMC). c) Water must be clean and free of harmful matter or solute. d) Materials used for temporary casings must not adversely affect the permanent works.

E.2

CONCRETE MIX: Concrete to comply with BS 8500 and BRE Special Digest 1 Design Guide. The site class is DC2 as defined in the Site Investigation. The minimum 28-day strength when tested in 2 accordance with Section G must be 30 N/mm .

E.3

CONCRETE TO BE PLACED UNDER WATER: 3

The cement content must not be less than 380 kg/m ; the fine aggregate shall represent between 45% and 50% if the weight of total aggregate, and the slump suitable for the method of placing the mix. The proposed method of working must be agreed beforehand. If the Subcontractor wishes to use special admixtures rather than increased cement content for under water placing, the admixture and its method of use must be approved beforehand.

E.4

ADMIXTURES FOR CONCRETE: The C.E. before use must approve the nature and quantity of any admixtures. This includes any admixtures used in truck washing or reactivation of unused concrete by the supplier.

E.5

READY MIXED CONCRETE: If the Subcontractor uses ready mixed concrete, he must retain the delivery ticket for each load used in the works for inspection by the C.E.

E.6

CONCRETE COMPLIANCE: Compliance will be assessed on the basis of BS EN 206-1 Clause 8.4. In particular, compliance with the specific characteristic compressive strength will be assumed if the conditions given in both a) and b) below are met: a)

The average strength determined from any group of 4 consecutive test

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

2

results exceeds the specified characteristic strength by 3N/mm . b)

The strength determined from any test result is not less than the specified 2 characteristic strength minus 3N/mm .

A "test result" is defined as the average strength of two test cubes crushed at 28 days. The C.E. is entitled to require evidence of compliance with all other details of the approved mix design.

E.7

REINFORCEMENT: The Subcontractor must take all precautions necessary to ensure that reinforcement is delivered and remains clean and free of contamination from mud, oil or any other material which would affect its bond with the concrete.

E.8

STORAGE AND HANDLING OF MATERIALS: The Subcontractor must ensure that reinforcement and materials for concrete are stored in accordance with BS 8110.

E.9

INSPECTION OF MATERIALS: The Subcontractor must afford to the Contractor and C.E. reasonable opportunity and facilities to inspect constituent materials at source, specified items during manufacture and construction, to take any samples or to make any tests.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

F

PROGRAMME AND METHOD

F.1

PROGRAMME: The Contractor will indicate the programme of site works and preferred sequence of working in his Invitation to tender. The Tenderer is to state in his Tender whether he can achieve the required programme, and what notice is required to book the piling rig.

F.2

METHOD: The Tenderer must show clearly in his Tender which method of piling he proposes and whether it is compatible with the sequence indicated by the Contractor. Any suggestion for an alternative sequence will be considered. If necessary, he must indicate measures to deal with difficult ground conditions, and include proposals for preventing heave and lateral displacement, and for avoiding damage to previously installed piles.

F.3

APPROVAL: The Subcontractor may start work on site only when his proposed method and working sequence have been approved by the C.E. Such approval does not relieve the Subcontractor of his responsibility for the work.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

G

TESTING STANDARDS

G.1

GENERAL:

PROCEDURES

AND

The Subcontractor is to provide all material plant, equipment, labour and technical staff for carrying out the tests described below to the satisfaction of the Contractor, C.E. and Building Inspector.

G.2

PRELIMINARY AND /OR WORKING PILE LOAD TESTS: The C.E. after consulting with the NHBC/LA will give instructions for the types and numbers of tests he requires. As a general guide the following will apply: a) For augured piles designed to a factor of safety of 2.0 the C.E. will probably require working pile tests at a rate of 1 test per 100 piles, or a preliminary pile test and a working pile test. He is unlikely to require tests on augured piles designed to a factor of safety of 2.5. b) For driven piles designed to a factor of safety of 2.5 the C.E will probably require working pile tests at a rate of 1 test per 100 piles, or a preliminary pile test and a working pile test. He is unlikely to require tests on driven piles designed to a factor of safety of 3. Any preliminary pile tests will be carried out before any working piles are installed. This will entail constructing and curing additional piles, solely for testing. For working pile tests, the C.E. may select any accessible pile or piles. Such tests will take place during the piling period and as far as possible be arranged so as to minimise interference with construction. No pile will be tested until calculations and cube tests show that the strength of concrete in the pile has reached at least twice the maximum stress to which it will be subjected in the test.

G.3

INTEGRITY PILE TESTING: The company selected to carryout the integrity testing must be approved by the C.E. prior to work commencing. The minimum number of continuous Flight Auger piles to be tested will be 25% of all piles or a minimum of 40 piles whichever is greater, subject to L.A/NHBC requirements.

G.4

ACCEPTABLE TEST RESULTS: Settlement of a working pile under test must not exceed 6mm under working load, or 12mm under one and a half times working load. Any test pile will be deemed to have reached its ultimate load when settlement exceeds 50mm or 10% of the equivalent diameter of the pile base whichever is the smaller.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

Settlement under a preliminary pile test must fall between the one and a half times working load criterion above the ultimate load settlement. Changes to these criteria may only be made with the agreement of the C.E.

G.5

UNSATISFACTORY PILE TEST RESULTS: The Subcontractor will bear the cost of any pile tests repeated because either a preliminary or a working pile failed to meet the required standard. He will also be responsible for the cost of any redesign, labour, material and plant in this connection.

G.6

PREPARATION OF PILE HEAD FOR TESTING: Trim the head of the pile back to sound concrete (or to just above cut-off level in the case of a working pile) and cap it with concrete of a strength at least that of the pile. The C.E. must approve the method of obtaining high early strength in the cap. The pile cap must be concentric with the pile, just large enough to cover the pile, and must project at least 150mm clear of the ground below. The top of the pile cap must be smooth and level, and covered with a mild steel plate of thickness and size suitable for spreading the jack load to the concrete. If the pile is of a large enough diameter, and subject to the C.E.'s approval, the steel plate may be mounted directly on the trimmed pile head and bedded on a high strength mortar.

G.7

TEST LOAD AND LOAD MEASUREMENT: Load preliminary pile to twice working load or as specified by the C.E. Load working piles selected for testing to 1.5 times working load. Apply the test load by a hydraulic jack; measure the load by a load cell or proving ring and check it by a pressure gauge. All equipment must have been recently calibrated.

G.8

TEST LOAD REACTION: The reaction to the hydraulic jack may be an arrangement of kentledge of sufficient weight for the purpose, and constructed so as not to exceed safe bearing on the supporting ground. It must allow safe access to the measuring equipment at the head of the pile. The test assembly must be capable of sustaining safely the test load and a margin of at least 20%. The distance from the edge of the test pile to the nearest part of the crib supporting the kentledge stack in contact with the ground must be at least 1.3m. The Subcontractor must obtain from the C.E. before work commences for any proposed alternative method of providing the reaction (such as tension piles). The centre to centre spacing of vertical reaction piles (including working piles used as reaction piles) from a test pile must be three times the diameter of the test pile, or three times the diameter of the reaction piles, or 2m, whichever is the greatest.

G.9

MEASURING PILE MOVEMENTS: Measure any vertical displacement of the pile under test load by either of the following methods:

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

a) Dial gauges graduated to at least 0.1mm and capable of measuring at least 50mm of movement. Provide at least two such dial gauges, and suspend them from rigid horizontal rails attached to two stout uprights which are firmly embedded in the ground at lest 2m from the centre of the pile and well clear of supports to the kentledge. b) A precise optical level may be used to read directly from a suitable scale fixed to the vertical side of the pile. Establish a reference datum to ensure that the level is not disturbed for the duration of the test. Protect the entire measuring assembly from frost, rain and the heat of the sun, and from any other disturbance, such as wind, which might affect the reliability of measurements. Check the height of the supporting rail from a remote datum by means of an optical level from time to time to ensure it has not been disturbed.

G.10 LOADING PROCEDURE: Apply and remove the test load in the increments and in not less than the corresponding periods indicated in the following table:

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

Percentage of

Minimum time for

working load

holding load:

25

30min

) )

) )

50

30min

75

30min

) )

) )

100

1h

75

10min

) )

) )

50

10min

25

10min

)working )

) )

0

1h

) pile test )

) )

100

6h

125

1h

) )

) )

150

6h

125

10min

) )

) )

100

10min

75

10min

) )

) )

50

10min

) )

) )

25

10min

0

1h

) )preliminary

100

30min

)pile test

150

30min

)

175

30min

)

200

1h

)

175

10min

)

150

10min

)

125

10min

)

100

10min

)

75

10min

)

50

10min

)

25

10min

0

1h

Extend the minimum times in the table until the rate of settlement is 0.25mm per hour or less and decreasing. Record readings of time and settlement at each load increment, at 15 minute intervals for 1 hour, at 30 minute intervals between 1 hour and 4 hours and at 1 hour intervals between 4 hours and 6 hours after the application of the load increment.

G.11 RECORD OF PILE TEST DATA: Submit a summary of the pile test data to the C.E. within 24 hours of the completion of any test, and a full report within 7 days giving the following information: a)

General details: Site name and address

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

Project reference Proposed structure Names of interested parties b) Details Test Pile in accordance with the requirements of Clause I.3. For concrete piles include also the mix details, reinforcement, cube test results and casting dates for pile and cap. c)

Installation details in accordance with Clause I.3. Include also details for unexpected circumstances and difficulties, and the start and finish of each operation during driving, installation and testing. Record delays and their cause. For concrete piles, include the method of installation, method of placing the concrete, volume of concrete placed, and the level of concrete before and after the extraction of any casing. For driven piles, include details of the support of pile and hammer, the type, size and weight of hammer, the type and condition of dolly and packing before and after driving, redrive check (time interval and number of blows to produce 25mm penetration), condition of pile head after driving, a record of any use of a follower, preboring or jetting, any lengthening, and details of temporary casing.

d)

Details of load tests Dates and times The method of load measurement, and whether it was a test of a preliminary pile or a proof load test of a working pile. A plan of the test rig showing relevant positions and distances. Kentledge weight or details of reaction piles, etc. The jack capacity.

e)

Results for load tests Present the test results in tabular form and graphically by load/time, settlement/time and settlement/load graphs. Record ground heave and any effects on adjacent structures.

f)

Details of integrity tests Testing method Pile numbers Relevant dates & time tested

g)

Results of integrity tests Present these in a tabular form including a copy of the actual output trace(s) together with a summary of the results and conclusion.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

H

CARE AND PROTECTION

H.1

ADJACENT PROPERTY AND EXISTING SERVICES: The Subcontractor must take care not to damage adjacent property or any existing overhead or underground services. He must put right any damage that he causes. Where the Contractor has information on the location of existing service or underground structures of adjacent property this information will be made available to the Subcontractor on request.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

I

SITE PRACTICE

I.1

SUPERVISION: The Subcontractor must ensure that he as a competent supervisor constantly in charge of the works.

I.2

SAFETY: The Subcontractor must protect open bores, tubes etc properly at all times. They must not be left open overnight but be backfilled. If this is not possible, the Subcontractor may approach the C.E. to request permission to leave any boreholes and tubes open and to agree a means of ensuring that there is no danger to site operatives or the public.

I.3

PILING RECORDS: The Subcontractor must keep daily records showing the following information, as appropriate, for each pile. He must give these records to the C.E. by noon on the next day. -

Pile reference number and diameter

-

Pile type

-

Ground level at pile position

-

Date driven or bored

-

Record or strata encountered (bored piles)

-

Date concreted (cast in place and precast piles)

-

Concrete mix and concrete volume placed

-

Hammer Type, weight and drop (driven piles)

-

Driving record (driven piles

-

Penetration per 100 blows or set in blows per 25mm (driven piles)

-

Depth of bore (cast in place piles) or length in the ground (driven piles)

-

Depth concrete (cast in place piles)

-

Ground water level in bore (cast in place piles)

-

Length and details of reinforcement

-

Length and depth of any temporary or permanent casing (bored piles)

-

Details of any obstructions encountered

-

Details of any unexpected boring or driving conditions or delays encountered

-

Position and level of head of pile

-

Level check for pile heave (driven piles)

-

Plumbness (driven piles and bored piles under 750mm dia)

-

Soil samples taken from bore

-

Name of the person who inspected and accepted the bore (cast in place piles)

A specimen Piling Record Sheet is shown in Appendix A.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

I.4

SETTING OUT: The Contractor will establish permanent survey control points not more than 50m apart he will supply an "angle bible" based on these points for setting out each pile position. The Subcontractor must construct each pile in the correct position as shown on the drawings and within the tolerances quoted in clauses B7 and B10. The Subcontractor must check the setting out of each pile with reference to the main survey control points described above, as the work proceeds. The Contractor will fix at least one soundly based temporary benchmark in the vicinity of the work. This will be used to ensure that the top of each pile is constructed to the correct level within the tolerances quoted in Clause B6.

I.5

EXCAVATION: The Subcontractor must excavate for the piles as rapidly as possible in order to minimise the time during which the excavated face is exposed to the atmosphere, or disturbed. When he has finished boring, he must clean the bore to remove loose and disturbed soil and expose a dry base of undisturbed material.

I.6

SPOIL ARISING FROM BORINGS: The Subcontractor must deposit all spoil from piling bores where it will not hamper the boring operations. The Contractor will remove it from the edge of the working area at reasonable intervals.

I.7

SOIL SAMPLES: The Subcontractor must provide at least 4 No. 100mm diameter undisturbed soil samples from various bores for strength testing where the piling technique permits. The C.E. will agree the locations and depths at which the samples are to be taken. The Subcontractor will seal, label, store and transport them as soon as practicable to a laboratory (previously approved by the Contractor) for testing. He must send one copy of the test report to the Contractor without delay.

I.8

CHANGE IN SUB-SOIL AND ANY OTHER CONDITIONS: If sub-soil conditions prove to be substantially different during the boring of a pile from those of other piles in the vicinity, the Subcontractor must notify the C.E. immediately. If such changes in ground conditions could adversely affect the pile as installed, the Subcontractor must submit proposals for suitable precautions to the C.E. for his approval before work proceeds. If any conditions relating to the piling operation are significantly different form those that could reasonably have been envisaged, the Subcontractor must likewise notify the C.E. immediately.

I.9

INGRESS OF WATER: The Subcontractor must keep the pile bores free of water at all times and make every effort to seal the bore against the ingress of water. If and when the C.E. agrees that the exclusion of water is impractical, the Subcontractor must ensure that the water level in the bore be

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

maintained at or above the standing level of subsoil water. Water arising from pile bores must not be discharged freely over the working area but must be conducted by the Subcontractor to points of discharge agreed with the Contractor.

I.10

BENTONITE: The C.E.'s approval to the use of this material must be obtained before use.

I.11

INSPECTION: The C.E. will inspect pile bores and casings for their full length both before and after the installation of any reinforcement and before concreting to ensure that the bore is clean and satisfactory in all respects. The Subcontractor is to provide all the apparatus necessary for the inspection.

I.12

CONCRETING: The Subcontractor must place the concrete as soon as possible after the bore has been inspected, and complete in one operation. If a delay occurs during concreting, the maximum allowable delay in completing a partly concreted pile is 1 Hr. The Subcontractor must notify the C.E. of any such delay immediately. In no circumstances may an uncased bore stand open for longer than 24 hours. Concrete must be placed continuously in such a way as to avoid segregation of the mix and displacement of the reinforcement. If the method of construction entails the withdrawal of temporary casings, the Subcontractor must do this in a way that will prevent the formation of voids, the inclusion of foreign matter in the concrete, any reduction of cross section or any damage in the finished pile. He must not withdraw temporary casings after the concrete contained in the casings has taken its initial set. No concrete may be placed in a bore that contains water, without the C.E.'s specific agreement or if the continuous flight auger method is being used. Concrete may only be placed under water by tremie pipe or through the centre of the auger.

I.13

CONTINUOUS FLIGHT AUGER PILES: The Subcontractor must maintain and monitor a continuous head of concrete to avoid separation as the auger is withdrawn. If the monitoring method includes a printout the Subcontractor must provide a copy of this weekly for the C.E..

I.14

COLD WEATHER CONCRETING: In the case of precast concrete piles concreting must not be carried out in an ambient o temperature below 2 C unless appropriate precautions are taken. In the case of piles cast in place, concreting may take place at any ambient temperature o provided the temperatures of the concrete when placed is not below 5 C and the o temperature of the concrete is not allowed to fall below 2 C before it has reached a strength 2 of 5N/mm . The top of the pile, including projecting reinforcement must be covered and

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

insulated against heat loss. The Subcontractor must agree with the C.E. the details and methods to be adopted to ensure these temperatures and strength requirements are met. Any concrete damaged by frost must be cut out and replaced with sound material at the Subcontractor's expense.

I.15

CONCRETE TESTING: Regardless of the source of supply, concrete for precast and cast in place piles must be sampled by taking one set of test cubes on each day that concreting takes place. The Subcontractor must take these cubes at varying times on successive days and have them cured and tested in an approved testing laboratory in accordance with BS EN 12390-3. Each set shall contain not fewer than 3 cubes, one as an indicator for testing at 7 days and two for testing for compliance at 28 days. The means of two results at 28 days shall be taken as the test result for compliance purposes. The Subcontractor will send one copy of each test certificate to the C.E. without delay.

I.16

UNFILLED BORES: Where piles finish below working surface level, the Contractor will fill the remaining empty bore with sand or other approved granular material as a safety measure. The Subcontractor is responsible for advising the Contractor when this operation can be carried out.

I.17

PRECAST CONCRETE PILES: The Subcontractor must ensure that these have reached the specified characteristic strength before starting to drive. He must support, handle and pitch them so as to ensure that the imposed stresses do not damage or overstress the pile. He must store and transport them firmly supported to avoid excessive bending stresses. He must arrange for each pile to be marked permanently in a suitable place with its identity, length and date of casting.

I.18

DAMAGED SHELLS OR LINERS: Pre-cast concrete shells or steel liners in which concrete is to be placed must be free of damage before being installed, and must be driven without damage.

I.19

LENGTHENING STEEL PILES: The Subcontractor may lengthen piles only when his detailed proposals have been approved by the C.E. All welding must be to BS EN 1011-1 & BS EN 1011-2.

I.20

LENGTHENING CONCRETE DRIVEN PILES: The Subcontractor may lengthen piles only when his detailed proposals have been approved by the C.E. He may not assume driving, until the new concrete has reached the

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

specified characteristic strength, which shall be assessed from test cubes cured under conditions similar to those on site.

I.21

DRIVING: The Subcontractor must notify the Contractor and the C.E. at least 24 hours beforehand that he intends to start driving. The C.E. must approve the set, depth, sequence and manner of driving.

I.22

PILE SUPPORT DURING DRIVING: The Subcontractor must ensure that at all stages during driving the pile is adequately supported and restrained by means of leaders, trestles, temporary supports or other suitable arrangements to maintain it in position and alignment and to prevent buckling, damage or overstressing.

I.23

CLOSENESS OF PILES: No pile or pile casing may be driven so close to an unfilled pile bore or to an uncased concrete pile in which the concrete has been in place for less than 24 hours, that it causes damage or distortion.

I.24

PREBORING: Preboring may be carried out only in accordance with the specification and on the instructions of the C.E, including instructions on the depth.

I.25

JETTING: This may be carried out only after the C.E. has approved the detailed proposals. In no circumstances may the last 3 metres of penetration be jetted.

I.26

RISEN PILES: The Subcontractor must re-drive any pre-cast concrete or steel tube piles which have risen as a result of subsequent driving nearby to achieve the original depth or set, unless the C.E. finds this unnecessary. If cast in place piles rise as a result of driving nearby, the C.E. will instruct the Subcontractor on the measures to take.

I.27

TRIMMING: The Contractor will trim piles back to cut off level.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

I.28

CLEARING UP: As soon as possible after completion the Sub-contractor must remove all his plant, equipment, materials and rubbish from the site.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

APPENDIX A PILING RECORD SHEET

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

PILING RECORD SHEET PILING CONTRACTOR.......................................................................... PROJECT BUILDING AREA/BLOCK NO..........................................................… PILE TYPE...........................................................................

PILE NO…........................................................ DATE…......................................... INSPECTION

CONCRETING

EXCAVATION/DRIVING DATE OF PRE-CASTING......................................................................... CUT OFF LEVEL (AOD).......................................................................... SUPPLIER............................................................................................... DRIVING/BORING STARTED................................................................

SHAFT DIAMETER/SIZE........................................................................

NO OF LOADS IF READY MIXED........................................................

DRIVING/BORING FINISHED................................................................

SHAFT LENGTH....................................................................................... VOLUME POURED..................................................................................

HAMMER TYPE........................................................................................ WEIGHT.................................................................................................

_______________________________________________________

DROP.......................................................................................................

CEMENT GRADE.....................................................................................

SET OF DRIVEN/PILE CASING (mm)

SOIL STRENGTH AT BOTTOM

CEMENT CONTENT...............................................................................

PILE/CASING VERTICALITY................IN............................................

OF SHAFT BY VANE TEST....................................................................

CEMENT TYPE:

CLEANLINESS......................................................................................

PC/SR/...........................................................................

CONDITION OF BOTTOM......................................................................

SLUMP

CASING LENGTH LEFT IN....................................................................

(mm)................................W/C......................................................

TOP CASING LEVEL (AOD)................................................................... GROUND LEVEL (AOD)

DEPTH OF SURFACE OF WATER

UNDISTURBED 100MM SAMPLE

STANDING IN BORE...............................................................................

TAKEN FROM SHAFT BOTTOM

YES/NO

REINFORCING CAGE LENGTH............................................................

CONCRETE LEVEL BEFORE TRIMMING (AOD)................................................................................... LEVEL OF TOP OF CAGE (AOD).......................................................... DROP OF CONCRETE ON REMOVAL OF CASING...........................................................................

DIFFICULTIES ENCOUNTERED:

ACTURAL, POSITION OF CENTRE LINE: AT SHAFT BOTTOM

ENG-2

REMARKS: __ AT GROUND LEVEL

APPROX NORTH

SIGNED................................................................................................... JOB STATUS............................................................................................. COMPANY............................................................................

INSPECTED BY:...................................................................

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

APPENDIX B TENER SUMMARY SHEETS

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

RSK LDE LIMITED

SECTION:

DEPARTMENT

PREP BY:

SHEET NO:

DATE:

CHECKED BY: DATE:

A

B

Contractor Tendering: Piling Method: Piling Type (Loading) Capacity kN Number Pile Diameter mm Ave Pile Length m Max Pile Length m Total Pile Length m Concrete Grade, cement type, min cement content & w/c ratio D.5, E2 Reinforcement & Cover C10, D4 & B14 Factor of Safety Employed D.3 Are you submitting Design Calculations? No. of visits to suit Clients Phases of construction Anticipated Clients Start Date Dates Rig available to start on Site Anticipated Duration to pilings Operations (Working Weeks) Piling Cost? (£) On/Off Site Cost (£) Are you offering Fixed Price Contract? Prices Fixed/Firm Until? Obstruction Cost? (£/m) Pile Type (Loading) Additional Boring Cost? (£/m) Empty Boring Cost? (£/m) Credit for Unconcreted Length (£/m) Credit for Short Boring (£/m) Cost and Length of temporary Casing (£/m) B.9 Cost of Sleeving or coating (where req'd) (£/m) D.2 Cost of preboring (when required) Cost of raking pile and max rake (When required)

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

C

D

RSK LDE LIMITED PHASE: DEPARTMENT

PREP BY:

DATE:

SHEET NO: CHECKED BY: DATE:

Working Platform requirements B6

Rate for preliminary Pile Test? (£) * Rate for Working pile Test? (£) * Vane Testing Cost I.7 U100 Samples cost I.7 Integrity Testing (Min 25% or 40 Piles) * Has concrete testing been included (Ref. I.15) Top of Concrete Level B.7 Does Tender comply with this Piling Specification? If not list non complaint Clauses The following are normal NHBC requirements on Piling and Pile Testing and should be verified with the NHBC for the contract before the tenderer is approved Piles designed to a factor of safety of 2 will require working pile tests at a rate of 1 per 100 piles or a preliminary pile test and one working pile test. Piles designed to a factor of safety 2.5 will not require testing if they are augered type piles. If they are driven piles then working pile test at a rate of 1 per 100 piles or a preliminary pile test and one working pile test will be required. All piles designed to a factor of safety of 3.0 will not require any preliminary or working pile tests. Where any piles are constructed by the Continuous Flight Auger method 25% or a minimum of 40 piles whichever is greater will require integrity pile testing. When open bored piles are employed then 4 to 6 U100 samples are required to justify the soils design criteria. All the above are general requirements and will be modified should problems be encountered during the piling operations.

* Type of test necessary, based upon Piling Method employed.

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

RSK LDE LIMITED 18 FROGMORE ROAD, Hemel Hempstead, HERTS, HP3 9RT SUMMARY OF PILING QUOTES Date: CONTRACTOR Type of pile Pile diameter (mm) Max possible length (m) Factor of safety No. of piles Ave. pile length (m) Total length (m) Concrete Grade Sulphates class Mix spec Reinf. + Cage Links + Spacing Cover to reinf. Temp. casting l'gth. (m) Sleeving Designed for tension Load Test Integrity test Conc. cube test U100 test Total Cost Breakdown

Overall cost/m pile (£) Remarks

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

-

POSSIBLE PILING CONTRACTORS FOR THIS CONTRACT

1. Rock and Alluvium Ltd SBC House, Restmore Way Wallington, Surrey SM6 7AH Tel: 020 8255 2088 Fax: 020 8241 6934

2. Simplex Foundations Ltd Pyebridge Industrial Estate, Main Road Pyebridge, Nr Alfreton, DE55 4NX Tel: 01773 606 006 Fax: 01773 606 106

3. Roger Bullivant Ltd Walton Road, Drakelow, Burton on Trent DE15 9UA Tel: 01283 511115 Fax: 01283 511866

5. Keller Ltd Oxford Road, Ryton on Dunsmore, Coventry CV8 3EG Tel: 024 76511266 Fax: 024 76305230

6. Amec Group Ltd Construction Services - Piling PO Box 4, Cold Meece, Swynnerton, Stone, Staffordshire ST15 0QX Tel: 01753 612500 Fax: 01753 612787 7. Bachy Soletanche Ltd Prospect Place Units 2 and 5 Mill Lane, ALTON Hants, GU34 2SX Tel: 01420 594700 Fax: 01420 86971

4. Van Elle Piling Ltd Kirkby Lane, Pinxton Nottinghamshire, NG16 6JA Tel: 01773 580580 Fax: 01773 862100

Durkan Ltd Specification for Piling and Associated Works 131979 PIL (01)

8. Piling Solutions Ltd Old School Hall, Well Street Bury St. Edmunds, IP33 1EQ Tel: 01284 766 333 Fax: 01284 749 930