080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT200 PT201 PT201.1 PT201.2 PT201.3 PT202 PT202.1 PT202.2 PT202.3 PT202.4 PT202.5 PT202.6 PT203 PT203.1 PT203.2 SPECIFICATION FOR NEW TUNNEL BORING MACHINE AND TUNNEL CONSTRUCTION – 7200mm MINIMUM NOMINAL INTERNAL DIAMETER FOR TUNNEL BETWEEN BECKTON STW AND ABBEY MILLS PS SUMMARY The work in this Section includes, but is not limited to, providing all labour, materials, tools, equipment, and incidentals necessary to construct a 7200mm minimum nominal ID finished tunnel (including a primary and secondary lining) in accordance with the Works Information and Site Information. The work in this Section includes, but is not limited to, the following activities: • The provision of a new Tunnel Boring Machine includes, but is not limited to: design, manufacture, supply, maintain and testing of a tunnel boring machine for the express purpose of constructing TBM excavated tunnels between Beckton and Abbey Mills. • Boring Tunnel includes, but is not limited to: mining of tunnels, installation of pre-cast concrete segmental tunnel lining, temporary tunnel facilities, geotechnical monitoring, control of ground loss, settlement and heave, and removal and disposal of excavated material. • As-Built Tunnel Survey This is a performance specification. The Contractor shall be responsible for the selection and complete design of the new tunnel boring machine and tunnel construction systems. The Works Information, Site Information and GBR provides parameters and design criteria for this element of the works. REFERENCE STANDARDS UK Health and Safety Regulations including but not limited to the Construction, Health, Safety and Welfare Regulation 1996, The Confined Spaces Regulations 1997 and the Approved Code of Practice H.S.E. Document L101. Joint Code of Practice for Risk Management of Tunnel Works in the UK published by the British Tunnelling Society/Association of British Insurers and the International Tunnelling Association/AITES Guidelines to Tunnelling Risk Management: ITA Working Group. BS6164: 2001 Code of Practice for Safety in Tunnelling in the Construction Industry. EFNARC (European Federation for Specialist Construction Chemicals and Concrete Systems) Specification and Guidelines for the use of Specialist Products for Soft Ground Tunnelling. This publication is located at the following internet address: http://www.efnarc.org/pdf/SGTSpec.pdf) BSEN 12336:2005 -Tunnel Machine Safety Requirements. The Groundwater Regulations 1998: “Protection of Groundwater Against Pollution Caused by Certain Substances” List One and List Two. DEFINITIONS TBM excavation: The construction of underground tunnels by mechanical means using a tunnel boring machine Segmental tunnel lining: Pre-cast concrete segments that are bolted together inside the TBM tail shield to form a gasketed, watertight tunnel lining ring. The lining shall be designed to withstand both handling loads and all ground and external hydrostatic and internal storm water loads. Thames Water Utilities Limited August 2008 Page 2 of 38
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT203.3 PT203.4 PT203.5 TBM: As used in this Section, the term New TBM means the total system of the tunnel boring machine including trailing gear and relevant support equipment, materials and any items of plant which are necessary for the sustaining of TBM excavation operations all to be designed in accordance with the requirements of this Section, all elements of the above shall be new. The TBM shall have the ability to apply a sustained and controlled pressure on the tunnel face within a pressure bulkhead located behind the face, to form a plenum under pressure with the remainder of the tunnel maintained at atmospheric pressure. EPBM: An Earth Pressure Balanced TBM with a pressure bulkhead located behind the face to form a plenum under pressure. Conditioners can be injected through the cutter head and into the plenum to control the quality of the excavated material through a screw conveyor in closed or open mode. For the construction of this tunnel the EPBM will operate in closed mode at all times, unless expressly agreed by the Project Manager. SPBM: A Slurry Pressure Balanced TBM utilising a controlled slurry in a pressure chamber in the head of the machine to stabilize the face and minimize settlement. The resultant slurry, with excavated material, is removed to the Slurry Separation plant by pumping. PT204 SUBMITTALS PT204.1 The following information shall be submitted to the Project Manager within 28 days of the award of Contract: a) TBM Manufacturer’s Name, Address, and Track Record in Production of similar TBMs. b) A detailed programme for the design, manufacture and assembly of the TBM including the place of manufacture and assembly. The Contractor shall arrange regular “Task Force” meetings with the Project Manager and the TBM Supplier to develop the TBM design, monitor the manufacture, ensure exchange of information, develop TBM transport and assembly requirements and meet programme dates. c) TBM Concept Plan and Drawings consisting of the following elements: i) General Arrangement Drawings from TBM manufacturer ii) Proposed TBM type including specifications to meet the minimum requirements set out in this document. iii) Statement on the technical assistance afforded by the TBM supplier to the Contractor during the assembly at the work site and during commissioning start up and learning curve until the TBM performance requirements have been achieved. iv) A statement setting out the training plan for the Contractors proposed TBM staff carried out by the in liaison with the Contractor. v) Statement of the technical assistance to be afforded by the TBM supplier during the assembly of the TBM. vi) Type of cutting tools, their wear resistance, expected wear rate and track record stating where they have been used on other projects. d) Preliminary Quality Plan The Preliminary Quality Plan shall indicate the approach and structure that the Quality Plan will take with respect to the design and supply of the TBM. e) All quality assurance and quality control procedures which are to be used in the design, manufacturing, commissioning and maintenance of the TBM. The preliminary plan shall cover such issues as, non-destructive testing plans, and of steel plate identification, weld testing and procedures. Thames Water Utilities Limited August 2008 Page 3 of 38
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080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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