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

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT226.4 PT226.5 PT226.6 PT227 PT227.1 PT227.2 PT227.3 PT228 PT228.1 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. Only TBM synthetic hydraulic oils HFDU (biodegradable, fire resistant, polyesters) shall be used. All oils shall be approved by the TBM manufacturer. The Contractor shall provide foams, polymers, bentonite or other conditioners as required for stabilizing the tunnel face and maintaining the required pressure until discharge from the screw conveyor/slurry discharge pipes under all conditions described in the Works Information and Site Information. All conditioners shall be biodegradable, inert and conform with Environment Agency requirements in List 1 and 2 of the Groundwater Regulation 1998, unless otherwise agreed with the Project Manager. SPARE PARTS Spare parts or maintenance materials to be stored on site shall include all items with lead in times greater than two days including: a) Parts and materials listed in the TBM manufacturer’s recommended spares list and maintenance plan. b) One complete set of excavation tools (discs, rippers and other cutters. One set consists of a complete replacement of all tools on the cutter head. c) Hydraulic rams, hydraulic hoses and components. d) Seals, o-rings and gaskets. e) Electrical and Mechanical components. Major spare parts to be stored off-site. Have one spare main bearing assembly, seals(bull gear), and one spare main drive motor stored off-site and vested to Thames Water and available from the TBM manufacturer for prompt replacement of the corresponding parts provided with the TBM. These spares shall be identified and available for the duration of the TBM excavation. FIRE PREVENTION – TBM AND BACK-UP Subject to the conclusions of the hazard assessment, the TBM and back up systems shall be provided with: a) A fire hazard assessment, which will address all potential fire sources, shall be carried out to the acceptance of the Project Manager. b) The fire suppression system shall be compatible with the hazard assessment. c) Electrical cabinets shall be fitted with a manually operated fire suppression system. d) Emergency plunger buttons at suitable locations to activate a fire alarm. e) Hand held extinguishers provided with colour coded covers in suitable locations. f) A means of rapidly shutting off fresh air ventilation to the tunnel face, after the area has been evacuated. g) Permanent notices giving emergency procedures, in the event of fire, placed in suitable locations. h) Operators and training manuals for use by the Contractor. Thames Water Utilities Limited August 2008 Page 22 of 38
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 i) Hydraulic hoses shall comply with BS EN 853. / ISO 1436. The hose covers to be flame retardant and to conform to the requirements of USMSHA. j) Gas monitoring for oxygen deficiency, CO2, CO, H2S, NO2, SO2 and CH4 . k) Water mist screen to be positioned at the rear of the Back-Up System. l) Low density foam generators to be sited at high fire risk areas with automatic operation in the event of fire. m) Essential services shall be protected so that they remain operable during all tunnelling operations for a period of 1 hour. These essential Services are: i) Emergency power supplies. ii) All fire suppression systems. iii) TBM emergency lighting. iv) Environmental monitoring systems v) All controls and tunnel communications. vi) The security of the air supply and control systems to the man lock shall remain operable in all emergencies, particularly in the case of fire. PT229 PT229.1 PT229.2 PT229.3 PT230 PT230.1 PT230.2 PT230.3 PT230.4 TBM FACTORY TESTING The Contractor shall submit, at least 30 days prior to the commencement of any factory tests, a test schedule and programme for the TBM and back-up system. The Contractor shall allow in his bid for the direct expenses, travel, and accommodation for the attendance by the Project Manager at the factory tests. 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 Project Manager prior to the TBM being delivered to the Site. The test shall include a demonstration mock up of the concrete segment erection system, using the precast concrete segments as proposed for the project. QUALITY ASSURANCE The Contractor shall operate a Quality Management system in accordance with of ISO9001, 9002 & 9003 Quality Assurance Requirements. The Quality Management system shall include procedures for design, manufacturing, testing, commissioning and maintenance of the TBM. It shall provide the results of all specified tests and inspections to the Project Manager. Periodically during the manufacturer of the TBM the Employer may conduct compliance audits relating to the design and supply of the TBM. The Contractor shall provide suitably qualified staff to assist the audit team 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 his works the Contractor shall use only qualified and suitably experienced persons in the following key positions:- Contract Manager, Construction Agent, TBM Mechanical Foreman and Electrical Foreman and TBM Operators. The Contractor shall submit the names and CVs of those key persons he proposes to use on this project. The Contractor shall arrange for a Technical Representative from the TBM manufacturer or an approved independent specialist, who is experienced in the assembly, operation and repair of TBMs, to be present for the duration of the Thames Water Utilities Limited August 2008 Page 23 of 38
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