Piling Specification

Derby City Council Derby Multi-Sports Sports Arena Specification for Piling Works S-SP-005 Issue | 24 February 2012

Ove Arup & Partners Ltd 3rd Floor The Frontage Queen Street Nottingham NG1 2BL United Kingdom www.arup.com

Job number

218212-00

Document Verification Derby Multi-Sports Multi Arena

Job title

Job number

218212 218212-00 Document title

Specification for Piling Works

File reference

4--06-07 Document ref

S-SP-005

Revision

Date

Filename

S-SP-005 005 Specification for Piling Works.docx

Issue

24 Feb 2012

Description

Issued for Stage D

Name

Prepared by

Checked by

Approved by

J Roberts

Mike Wood

John Read

Prepared by

Checked by

Approved by

Prepared by

Checked by

Approved by

Prepared by

Checked by

Approved by

Signature Filename Description

Name Signature Filename Description

Name Signature Filename Description

Name Signature Issue Document Verification with Document

S-SP-005 | Issue | 24 February 2012 M:\218000\218212-00 DERBY MULTI-SPORTS ARENA\4 INTERNAL DATA\4-05 SPECIF IFICATIONS\4-06-07 STRUCTURAL\S-SP-005 SPECIFICATION FOR PILING WORKS.DOCX

Derby City Council

Derby Multi-Sports Arena Specification for Piling Works

Contents Page

SPECIFICATION

1

B1

Specification requirements for piling and embedded retaining walls 2

B1.2

Project Specification

2

B2

Driven pre-cast concrete piles

9

B2.2


9

B3

Bored cast-in-place piles

10

B3.2


10

B4 Piles constructed using continuous flight augers or displacement augers 11 B4.2


11

B5

Driven cast-in-place piles

12

B5.2


12

B6

Steel bearing piles

13

B7

Timber piles

13

B8

Diaphragm walls and barrettes

13

B9

Secant pile walls

13

B10

Contiguous pile walls

13

B11

King post walls

13

B12

Steel sheet piles

13

B13

Integrity testing

14

B13.2


14

B14

Dynamic and rapid load testing of piles

15

B15

Static load testing of piles

16

B15.2


16

B16

Piles with sleeves and/or coatings

18

B17

Instrumentation for piles and embedded retaining walls

18

B18

Support fluid

18

B19

General requirements for concrete and steel reinforcement

18

B19.11 Form for specification of designed concrete B19.12 Other particular technical requirements

S-SP-005 | Issue | 24 February 2012 M:\218000\218212-00 DERBY MULTI-SPORTS ARENA\4 INTERNAL DATA\4-05 SPECIFICATIONS\4-06-07 STRUCTURAL\S-SP-005 SPECIFICATION FOR PILING WORKS.DOCX

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Derby City Council



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Derby City Council


SPECIFICATION The Specification shall be the specification section only of the ICE Specification for Piling and Embedded Retaining Walls 2nd Edition, published by Thomas Telford Ltd in 2007, with information, amendments and particular requirements as set out in this Project Specification. Where there is conflict with the ICE Specification for Piling and Embedded Retaining Walls, the Contract Documents, published standards and/or codes of practice, the requirements of this Project Specification shall take precedence over other requirements.


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Derby City Council


B1 Specification requirements for piling and embedded retaining walls B1.2 Project Specification (a) Role of the Engineer The role of the Engineer shall be undertaken by the Contract Administrator. For the purposes of this document the term ‘Main Contractor’ shall apply to the principle design and build contractor appointed for the construction of the project. The term ‘Contractor’ shall apply to the sub-contractor(s) appointed by the Main Contractor to undertake the piling works.

(b) Location and description of the site Refer to Main Contract documents. A description of the site and its ground conditions are included in the following documents and other site data: •

Geotechnical Engineering Limited (GEL). Phase 1 Geo-Environmental Desk Study, Pride Park, Derby, for the proposed Outdoor Sports Hub (Multi-sports Arena). GEL Report No. 25759/01, dated 5 August 2011.

•

Geotechnical Engineering Limited (GEL). Derby Multi-sports Arena, Factual Report on Ground Investigation.

In summary, the site is a former landfill which sits on River Terrace Deposits which form a Secondary A Aquifer. At depth, the solid geology consists of the Mercia Mudstone which is designated as a Secondary B aquifer. The River Derwent flows immediately to the south and east of the site. A bentonite cut-off wall was constructed in the 1990’s to prevent migration of contaminated groundwater from Pride Park into the River Derwent. It is reported that radioactive waste was deposited between 1961 and 1966, in trenches, in advance of the landfill waste fill front. The majority of the radioactive waste reportedly consisted of materials slightly contaminated with Uranium, emitting alpha radiation; a relatively non-penetrating form of radiation. The Geotechnical Engineering Desk Study reports that an investigation in 1993, undertaken by Sir Owen Williams & Partners failed to find any radioactive materials. It is understood that the recent ground investigation by GEL also failed to identify any radioactive materials.

(c) Nature of the works The Works comprise the design and construction of piles through the landfill to support the whole of the building and ground floor slab. The Tender stage drawings are based on approximately 650 No. Piles with an assumed indicative capacity of 750kN and an assumed diameter of 450mm. The design of the piles and the selection of piling system, load capacity and pile arrangement shall be the responsibility of the Contractor. This specification allows for a range of pile


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Derby City Council


types. However, the Contractor is free to propose any pile type but must provide full justification for the selection of his chosen option with the tender return. The Contractor will need to consider the impact of negative skin friction. The design and construction of the piles must take full account of all necessary measures to prevent pollution of controlled waters (refer to the Environment Agency guidance “Piling and penetrative ground improvement, methods on land affected by contamination: a guidance on pollution prevention”, National Groundwater and Contaminated land Centre Report NC/99/73, Dated 2001. The Contractor shall ensure that the pile design and construction fully complied with the requirements of the Local Planning Authority and the Planning Conditions, and provide method statements and works proposals as required to demonstrate this to the satisfaction of all stakeholders to the planning process. The Contractor shall provide a tender design with his tender return.

(d) Working area Refer to Main Contract documents.

(e) Sequence of the works and other works proceeding at the same time Refer to Main Contract documents.

(f) Contract drawings The Tender Drawings (as revised) for the building substructure are: Drawing No.

Drawing Title

S-001

General Notes

S-090

Foundation General Arrangement – Pilecap and Ground Beam

S-200

Foundation Details – Sheet 1

S-201

Foundation Details – Sheet 2

Reference should also be made to drawings for other below ground items such as drainage and incoming services. The Piling General arrangement drawing is based on 450mm diameter piles with an indicative capacity (compression) of 750kN. The number of piles and sizes of pile caps shown are indicative and have been produced prior to receipt of ground investigation data. The quantum may change depending on the pile size and load capacity selected by the Contractor.

(g) Office and other facilities for the Engineer Refer to Main Contract documents.


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Derby City Council


(h) Submission of information (in addition to Table B1.1) The information which shall be submitted at the stated stages of the Works Contract is listed in Table B1.1 of the Specification. In addition, the Tenderer shall submit the following details with his tender: 1. Proposals to deal with noise and vibration, an assessment of vibration characteristics for the different piling operations and how they will attenuate with distance. 2. Details of method of achieving penetration of the ground given its nature as a former landfill site. 3.

Details of method of location and avoidance of critical services.

4. The anticipated time required for installation of the piles from commencement of site works to completion. 5.

Evidence of experience of this type of work.

6. Proposed methods for control of the piling and/or retaining wall works in terms of checks on enactment of the design, including the setting out. 7.

Details of the equipment to determine the depth and verticality.

8. Details of the method of transporting and placing concrete in piles. For CFA piles, explanation as to how a positive concrete pressure will be maintained at all times. 9. Typical pile record sheets. Confirmation that a complete record sheet will be produced for every pile. 10.

Details of how the specified casting level tolerance will be achieved.

11. Details of the action that would be taken to stabilise an excavation if for any reason the completion to the excavation of the concreting is delayed or prevented. 12. For CFA piles - Details of rig power expressed as torque capacity in tonne metres at rotation speed greater than 10 r.p.m., together with confirmation that the proposed configuration of rig and auger types are not susceptible to flighting for the pile diameters and soil conditions under consideration. 13. The pile design basis and calculations for elements that are specified in Clause B1.4 to be Contractor designed.

(i) Responsibility for design, including any division of responsibility Option 2 - Contractor design of piles is specified. The Contractor shall confirm that the ground investigation information provided is adequate for his construction. If he is concerned about its adequacy, his tender should list his concerns. Design responsibility

Contractors Engineer


Contractor

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Derby City Council


(Novated) 1. Design of foundation layout, concrete sections and reinforcement detailing instructions for pilecaps and substructure (reinforcement details are by Contractor)

2. Choice of piling method

3. Design of piles to carry specified loadings and all detailing and reinforcement of piles

(j) Design standards and criteria for the piles or walls including design life Pile design to be in accordance with British Standard BS EN 1536 (where applicable) and BS EN 1997. The design life is 60 years.

(k) Constraints on design Refer to Main Contract documents.

(l) Working platform and commencing surface level Refer to Main Contract documents. The Contractor shall provide details of any additional requirements to the Main Contractor.

(m) Schedule of Specified Working Loads or Representative Actions The Piling General arrangement drawing is based on 450mm diameter piles with an indicative capacity (compression) of 750kN. The number of piles and sizes of pile caps shown are indicative and have been produced prior to receipt of ground investigation data. The quantum may change depending on the pile size and load capacity selected by the Contractor. Any deviations from the above load capacities and indicative pile dimensions are to be highlighted by the Contractor in the tender return.

(n) Pile or wall element dimensions The Contractor is to provide details.

(o) Preliminary piles and trial bores/drives/panels The use of trial bores/drives/ is not specified but is permitted at locations subject to prior approval by the Contract Administrator. The Contractor shall state in his Tender whether he proposes to use trial bores/drives. Where trial bores are proposed they shall be backfilled with concrete. The Contractor shall state in his tender whether he proposes to construct and load preliminary test piles to verify the design.


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Derby City Council


(p) Performance criteria for the structure to be supported on the piles or by the wall Refer to Main Contract documents.

(q) Performance criteria for piles under test or wall elements during service (see Tables B1.2, B1.3)

tbc

Contractor to advise

750 $

tbc $

2.5/3 *

tbc $

5mm

8mm #

Minimum or maximum pile diameter or dimensions of crosssection (mm)

Minimum pile length from cut-off level to toe (m)

Permitted settlement at DVL + ½ SWL (mm)

Permitted settlement at DVL (mm)

Design Verification Load (DVL), (kN)

Minimum factor of safety

Pile designation

Specified Working Load (SWL) (kN)

Permitted types – Performance Specification Section No

Pile Ref No

Table B1.2 - Performance specification criteria for piles

tbc

tbc $

* The minimum factor of safety shall be 2.5 for compressive loads and 3.0 for tension loads. # The load settlement performance shall be approximately linear. $ Design loads and pile details are to be confirmed by the Contractor on completion of detailed design.

(r) Sampling and testing of materials (other than concrete) None specified.

(s) Permissible damage criteria for existing critical structures or services All services within and without the site area shall be maintained in a serviceable condition and measures must be taken to ensure that piling operations do not cause damage or disrupt their continued operation.

(t) Additional temporary works plant and duration of loading for which the working platform should be designed Refer to Main Contract documents and main Contractor.

(u) Site datum and site grid Refer to Main Contract documents.

(v) Restrictions on permissible working hours Refer to Main Contract documents.


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Derby City Council


(w) Restrictions on noise and vibration levels Refer to Main Contract documents.

(x) Site Investigation including geotechnical and geoenvironmental information, and the need for further Site Investigation The following Desk Study and ground investigation data is included in the main Contract Documents: •

Geotechnical Engineering Limited (GEL). Phase 1 Geo-Environmental Desk Study, Pride Park, Derby, for the proposed Outdoor Sports Hub (Multi-sports Arena). GEL Report No. 25759/01, dated 5 August 2011.

•

Geotechnical Engineering Limited (GEL). Derby Multi-sports Arena, Factual Report on Ground Investigation.

The Contractor shall confirm in his Tender return that the site investigation information provided is adequate for his design and / or construction. If he is concerned about its adequacy, his tender should list his concerns and include proposals for any additional ground investigation.

(y) Disposal of excavated material and trimmed excess pile and wall material 1. Spoil generated from the site will require disposal in accordance with the Environmental Protection Act 1990, the Landfill (England and Wales) Regulations 2005 (as amended), the Hazardous Waste Regulations 2005, the Waste Management Licensing Regulations 1994 and any other relevant statutory instrument and guidance. 2. All material removed from site must be adequately described including reference to the appropriate codes in the European Waste Catalogue. Appropriate documentation shall be retained, and be available for inspection, that demonstrates the nature of the material to be disposed of including chemical analysis where appropriate. Copies of the relevant documentation may be requested by the Engineer 3. The Contractor is responsible for carrying out representative chemical analysis of the waste material before the material is removed from site if such analysis is necessary. The Contractor shall determine if existing information is adequate and representative and undertake additional analysis where appropriate. 4. The Contractor is responsible for registering the site with the Environment Agency as producing hazardous waste, where appropriate.

(z) Other particular technical requirements Quality management system: The Contractor is required to work to a Quality Management system established in accordance with BS EN ISO 9001:2000. Details shall be provided prior to commencement of work on site.


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Amendment to Table B1.4: Table B1.4 is amended as follows: Plan position for piles/walls with cut-off level below commencing surface and constructed with a guide wall to be 25mm + 13.3mm for every 1m below cut-off level. Addition to B1.15 Supervision and control of the works: The Contractor shall provide a qualified full time supervising engineer competent in piling works of the nature of this contract. The supervising engineer will be responsible for ensuring that all aspects of the specification are satisfied during the works and will also be responsible for issuing the Engineer with piling records. The piling contractor shall not remove the supervising engineer from site without obtaining written permission from the Engineer. The CV of the supervising engineer shall be submitted to the Engineer for approval at least 14 days prior to commencing the Works.

(aa) Special requirements for retaining walls Not applicable.

(bb) Loads on walls and excavation depths Not applicable.

(cc) Water retention function and degree of retention for retaining wall in both temporary and permanent condition Not applicable.

(dd) Design external groundwater level for the water retention system and for water tightness inspections Not applicable.

(ee) Design water retention Grade for permanent overall system and the role of the retaining wall as a system component Not applicable.

(ff) Programme for watertightness inspections Not applicable.

(gg) Permissible limits on ground movement during wall installation Not applicable.


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B2 Driven pre-cast concrete piles B2.2 Project Specification (a) Penetration depth or depth or toe level To be confirmed by the Contractor.

(b) Driving resistance or dynamic evaluation of set To be confirmed by the Contractor.

(c) Uplift/lateral displacement trials Requirement to be confirmed by Contractor.

(d) Pre-boring or jetting or other means of easing pile driveability Requirement to be confirmed by Contractor.

(e) Detailed requirements for driving records No additional requirements specified.

(f) Pile shoes (where required) Contractor to advise.

(g) Types of prestressing tendon Prestressing tendons shall be either wire or stress relieved seven-wire strand complying with BS 5896.

(h) Marking of piles Each pile shall be clearly marked with the date of casting, a unique reference number, the principal dimensions and a thin band at least half way round each pile at 0.25m intervals from the toe for a distance at least 2m in excess of expected depth within the ground when driven.

(i) Other particular technical requirements Grout Grout shall be made from ordinary Portland cement and water only in accordance with Clause B19.10.


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B3 Bored cast-in-place piles B3.2 Project Specification (a) Support fluid The use of support fluid is permitted. If the Contractor considers it necessary to use support fluid his tender should provide details.

(b) Base or shaft grouting Not required.

(c) Pile shaft and base inspection by CCTV and or sampling/probing (see Clause B3.5.8) Not required.

(d) Details of permanent casings The Contractor is to assess the need for permanent casing and detail requirements in his submission.

(e) Inspection of underreams Not applicable.

(f) Other particular technical requirements None specified.


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B4 Piles constructed using continuous flight augers or displacement augers B4.2 Project Specification (a) Permitted pile types The following pile types are permitted: continuous flight auger (CFA) piles displacement auger (DA) piles

(b) Whether splitting of augers shall be permitted Splitting of augers is not permitted.

(c) Whether concrete supply is to be controlled by pressure or volume (Clause B4.4.5.3) Either of the methods below may be used: Method 1 – Control of concrete by measuring concrete pressure shall be used, or Method 2 – Control of concrete by measuring volume above ground shall be used.

(d) Detailed requirements for monitoring records Records to be kept for raking piles and level of top of reinforcement cage for continuous flight auger concrete or grout piles.

(e) Other particular technical requirements None.


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Derby City Council


B5 Driven cast-in-place piles B5.2 Project Specification (a) Penetration or depth or toe level To be confirmed by the Contractor.

(b) Driving resistance or dynamic evaluation or set To be confirmed by the Contractor.

(c) Uplift/lateral displacement trials Requirements to be confirmed by the Contractor.

(d) Pre-boring or jetting or other means of easing pile driving Requirements to be confirmed by the Contractor.

(e) Detailed requirements for driving records None.

(f) Types and quality of pile shoes Requirements to be confirmed by the Contractor.

(g) Sampling and testing of pile materials Requirements to be confirmed by the Contractor.

(h) Other particular technical requirements Requirements to be confirmed by the Contractor.


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B6 Steel bearing piles Not used.

B7 Timber piles Not used.

B8 Diaphragm walls and barrettes Not used.

B9 Secant pile walls Not used.

B10 Contiguous pile walls Not used.

B11 King post walls Not used.

B12 Steel sheet piles Not used.


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Derby City Council


B13 Integrity testing B13.2


(a) The method of test to be carried out Pile testing shall be carried out by either: •

impulse method

•

sonic echo, transient dynamic steady state vibration method

•

transient dynamic response (frequency response) method, with simulations and impedance profiles to be carried out on piles having anomalous test results

(b) The number, type and location of elements to be tested For CFA piles all working piles shall be integrity tested. For other types of piles the Contractor shall submit proposals.

(c) The stages in the programme of works when a phase of integrity testing is to be carried out Testing shall be undertaken after the pile has been trimmed. Testing of each pile shall take place within 28 days of casting of that pile and all testing shall be completed within 14 days of casting of the last pile.

(d) Where cross hole sonic logging is used, the following shall be specified: the number and location of elements to be tested, the number and location and length of ducts to be placed, the depth over which the testing is required and the depth interval that shall not be greater than 0.25m Not applicable.

(e) The time after testing at which the results and findings shall be available to the Engineer, if different from the requirements of Clause B13.8 Preliminary test results shall be made available within 24 hours in accordance with Clause B13.8 of the Specification.

(f) The number of days to elapse between casting and integrity testing Piles shall not be tested within 7 days after casting the pile.


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(g) Preparation of concrete surface of test element for testing using the vibration method Subject to specialist integrity testing firm's recommendations.

(h) Other particular technical requirements None.

B14 Dynamic and rapid load testing of piles Not used.


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Derby City Council


B15 Static load testing of piles B15.2


a) Type of pile One static load test shall be undertaken on each type of pile and at a rate of 1 test per 100 piles or every part of.

b) Type of test For working test piles the test shall be the multi-cyclic maintained proof load test to DVL + 50% SWL in accordance with Section B15.13. For preliminary test piles the test shall be the multi-cyclic maintained proof load test to DVL + 50% SWL followed by an extended maintained proof load test to DVL + 200% SWL in accordance with Section B15.13. The Contractor shall state in his tender whether he proposes to undertake static load tests on preliminary piles to verify his design.

c) Loads to be applied and procedure to be adopted in testing preliminary piles, including maximum reaction capacity Procedure as above Section B15.2(b).

d) Loads to be applied and procedure to be adopted in prooftesting of working piles, including maximum reaction capacity Procedure as above Section B15.2(b).

(e) Whether test is to be compression or tension and number of loading cycles Load testing is to be compression.

(f) Special materials to be used in construction or preliminary test piles where appropriate None.

(g) Special construction detail requirements for test piles, including requirements for additional reinforcement, increased concrete strength, sampling or in-situ testing Location of preliminary and selection of working test piles shall be specified by the Engineer following receipt of pile construction records.


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(h) Special requirement for pile-testing equipment and arrangement, including requirements for any pile instrumentation None.

(i) Pile installation criteria None.

(j) Time interval between pile installation and testing The time interval between pile installation and commencement of load testing shall be a minimum of 7 days.

(k) Removal of Temporary Works All tension piles are to be trimmed to ground level and all temporary works are to be removed from the site within 14 days of completion of all testing.

(l) Whether interpretation is required and extent of interpretation The Contractor shall interpret the results in accordance with Clauses B15.15.3 and B15.15.2 as required.

(m) Additional records or information required from the load test No additional records required.

(n) Displacement transducer stem level To be advised by the Contractor.

(o) Cut off level for test To be advised by the Contractor in accordance with the design.

(p) Details of works to be carried out to the test pile cap or head at the completion of a test Not required.

(q) Special requirements for the application of a lateral load to a pile detailed in accordance with the expected loading (the principles of loading and other relevant data may be adapted from the Specification clauses which follow) Not required.

(r) Other particular technical requirements None.


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Derby City Council


B16 Piles with sleeves and/or coatings Not used.

B17 Instrumentation for piles and embedded retaining walls Not used.

B18 Support fluid Not used.

B19 General requirements for concrete and steel reinforcement B19.11 Form for specification of designed concrete The concrete designation shall be determined by the Contractor in accordance with the design. The Design Concrete (DC) class shall be determined by the Contractor in accordance with BRE Special Digest 1.

B19.12 Other particular technical requirements (a) Concrete designation (Table B19.4) The concrete mixes shall be determined by the Contractor in accordance with the design and the design concrete classification.

(b) Composition of concrete (Clause B19.2.2) Types of cement and combination: Wherever practicable, the use of secondary cementitious materials (fly ash and ggbs) shall be maximised within practical limits, thus CEM I, II-S, IIA-V and SRPC cements and combinations should not be used unless technically justified. Aggregate: Where used, coarse RCA shall comply with clause 4.3 of BS 8500-2: 2006. RA and fine RCA shall not be used.


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(c) Designed or prescribed mixes (Clause B19.2.2) The concrete shall be supplied as designed concrete in accordance with Table B19.4 and BS 8500.

(d) Consistence testing (Clause B19.2.4) Concrete consistence shall be measured by the slump or flow table test as appropriate for the level of consistence required.

(e) Water (Clause B19.4.3) Water from non-potable sources shall be tested for compliance with BS EN 1008.

(f) Non-ferrous reinforcement (Clause B19.9.6) Not required unless indicated on drawings.

(g) Bond length of, and cover to reinforcement Nominal cover to reinforcement and bond length shall be as shown on the drawings.


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Piling Specification

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