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

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT300 d) The guidance system must be fully operational whenever the TBM is advancing. PT316 PT317 PT318 PT318.1 PT318.2 PT318.3 PT318.4 PT318.5 PT318.6 PT318.7 PT318.8 PT319 APPLICABLE CODES AND REGULATIONS The TBM and its components shall meet all applicable codes and regulations, and all requirements posed by the electric power suppliers and any other agency that has jurisdiction. TAIL SEAL GREASE INJECTION Tail Seal grease injections shall be automatic and continuous to ensure effective filling between the brushes. Injection of grease shall be in accordance with the TBM manufacturer’s written requirements, and shall be a positive distribution system to ensure even distribution of grease, details of which shall be made available to the Engineer. Tail Seal grease shall be fireproof. OTHER FEATURES Provide the TBM with probe hole and grouting drilling capability such that the probe and grout holes can be maintained a minimum of 20 metres ahead of the TBM cutterhead. The probing ports shall be fitted with suitable glands and valves to withstand the pressures envisioned. Provide method to test for the presence of hazardous or explosive gas in accordance with Health and Safety regulations requirements. Particular attention should be taken for the potential for migration of contaminated material from the Abbey Mills Site details of are given in Schedule 6 of the Works Information and the Factual Site Investigation Reports issued as part of the Contract All electrical power, control and safety systems shall have a minimum moisture ingress protection rating of NEMA 12. All cables in the tunnel shall be LSF (Low Smoke and Fume) or LSOH (Low Smoke Zero Halogen) sheathed. If the TBM has a high voltage transformer this shall have an over temperature alarm and shall include all safety devices as required by the regulatory authorities. Provide an environmental monitoring system that detects levels of potentially hazardous gases. Systems shall be arranged with adjustable limits and shall have a first level warning signal and a second level with automatic shut off of tunnelling equipment in accordance with Health and Safety Regulations requirements. Gases to be monitored shall include methane, oxygen, hydrogen sulphide, carbon dioxide and carbon monoxide and other gases, mists and fumes. The Contractor shall supply Calibration Test Certificates for gas detection system, pressure cells in excavation chamber and screw conveyor, TBM guidance system and grout pressure gauges. Certificates to be updated in accordance with the manufacturers recommendations. In order to provide a clean environment for placing of the invert segment plate, the Contractor shall take appropriate measures to keep the shield area free from water and spoil material. Pumping facilities in the shield area of the TBM shall be designed to allow sufficient space for the equipment proposed. The TBM shall be designed to withstand the full overburden pressure and anticipated hydrostatic pressures. Only TBM synthetic hydraulic oils HFDU (biodegradable, fire resistant, polyesters) shall be used. All oils must be approved by the TBM manufacturer. FIRE PREVENTION – TBM AND BACKUP The TBM shall be provided with the following minimum systems of fire prevention but not limited to: Thames Water Utilities Limited August 2008 Page 8 of 15
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT300 PT320 PT320.1 a) Emergency Plunger buttons at suitable locations to activate a fire alarm. b) Hand held extinguishers provided with colour coded covers in suitable locations. c) A means of rapidly shutting off fresh air ventilation to the tunnel face, after the area has been evacuated. d) Conveyor belting, rubber covered rollers and other similar parts to be manufactured in materials that reduce the fire and toxic fume risk (Health and Safety regulations approved). e) Fire suppression system –manually operated TBM FACTORY TESTING The Contractor shall submit, at least 30 days prior to the commencement of any factory tests, a test schedule and program for the TBM and back-up system. The Contractor shall allow for attendance by the Engineer at the factory tests. PT320.2 The TBM shall be tested in accordance with the manufacturers recommendations and a certificate of confirmation of compliance with the requirements of this Section, together with a copy of the test results, shall be signed by the Contractor and the TBM manufacturer and shall be forwarded to the Engineer prior to the TBM being delivered to the Worksite. PT320.3 The test shall include a demonstration mock up of the concrete segment erection system, using the precast concrete segments as proposed for the project. PT321 PT321.1 PT321.2 PT322 PT322.1 PT322.2 QUALITY ASSURANCE TBM Manufacturer: The proposed TBM manufacturer shall be a recognised commercial TBM manufacturer with no less than 5 years of successful experience in the design and manufacture of TBMs of the type proposed by the Contractor. For this project the Contractor shall use only qualified and experienced person in the following key positions:- Contract Manager, Construction Agent, TBM Mechanical Foreman and Electrical Foreman and TBM Operators. The Contractor shall submit with his tender return the names and CVs of those key persons he proposes to use on this project. TUNNEL HEALTH AND SAFETY ASSURANCE As part of the Contractor’s Safety program the Contractor shall produce a Tunnel Specific Safety Statement detailing the precautions to be implemented to protect personnel working in the tunnel from the construction methodology risks associated with tunnelling at the designed gradients and long section. These shall include: a) Risk of runaway trains and derailments b) Tunnel inundations c) Control of water and standby provisions d) Temporary Tunnel Ventilation System e) Emergency evacuation of tunnel f) Fire precautions. g) Management of rail and pedestrian movements in the tunnel. h) Tunnel Interventions for routine maintenance and unplanned events Bored Tunnel Temporary Facilities Thames Water Utilities Limited August 2008 Page 9 of 15
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080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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