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

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 • ISO/DRT 11690; Parts 1,2 & 3: Acoustics-Recommended practice for the design of low noise workplaces containing machinery. • Noise at Work Regulations 1989 (refer to regulation12). • Section 2 HSW/HS (G) 88, Hand-arm vibration; • BS 6841:1987; Measurement and evaluation of human exposure to whole body mechanical vibration and repeated shock. • BS 6842: 1987; Measurement and evaluation of human exposure to vibration transmitted to the hand. PT235 PT234.1 PT234.2 PT234.3 BORED TUNNEL TEMPORARY FACILITIES The Contractor shall provide, operate and maintain for the duration of tunnelling construction a temporary ventilation system, which conforms to the Health and Safety requirements. The equipment shall be adequate to maintain sufficient supply of fresh air in underground work areas. a) Mechanical ventilation systems shall not be removed without the acceptance of the Project Manager. b) As a minimum, when the excavations are occupied by workers, the ventilation system shall be designed to deliver fresh air at a volumetric flow rate equal to 20mtrs per minute times the cross-sectional area of the tunnel. A higher volumetric flow rate shall be provided if necessary c) Power to the main ventilation system shall not be interrupted in the event of an alarm of the air monitoring system. d) Advance of the ventilation system shall be made a regular part of the normal tunnel excavation cycle. e) Temporary Tunnel Lighting System: The Contractor shall provide a temporary lighting system in the tunnel which conforms to the requirements of BS6164:2001“Code of practice for safety in tunnelling in the construction industry”. Lighting in the tunnel shall extend the full length of the tunnel and not be less than that required for safe working and access. An alternative source of power and emergency lighting system shall be provided to allow emergency securing operations and safe evacuation in the event of a primary power failure. An adequate number of hand lamps shall be located at key points underground. f) Temporary Personnel Walkway: The Contractor shall provide walking access in the tunnel at all times. This shall have a firm, level, slip- resistant and continuous surface and shall be suitable for use in emergencies. g) Temporary Locomotive Track: The track should be properly supported and secured against displacement in the tunnel. The entire length of the track shall be examined not less than once a week and the results of this inspection shall be forwarded to the Project Manager. Defects shall be recorded and remedial action will be promptly implemented when identified. h) Temporary Pumping: Provide intermediate pumping stations and reserve pumping capacity at the any point of the tunnel as required to remove groundwater inflows and construction water. i) Fire Extinguishers: Fire extinguishers shall be provided at a minimum every 500 metres of the running tunnels. They shall be maintained in accordance with the manufacturer’s recommendations. Smoking Policy There shall be no smoking in the tunnel. Breathing Sets Thames Water Utilities Limited August 2008 Page 26 of 38
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 Approved emergency breathing apparatus or approved oxygen self-rescuers as appropriate shall be provided and kept with all persons visiting or working in the tunnel for the duration of their time in the tunnel. All such equipment shall be regularly maintained in accordance with the manufacturers recommendations, records shall be kept in the Contractors site office and made available for inspection by the Project Manager. PT236 PT236.1 PT236.2 PT237 PT237.1 PT237.2 PT237.3 PT237.4 PT238 PT238.1 TUNNEL BORING MACHINE MAINTENANCE. The Contractor shall monitor and analyse lubricants in critical areas of the tunnelling equipment on a weekly basis. This shall be performed by an Independent Laboratory to identify the presence of any pollutants. Critical areas shall include all major sealing systems, main bearing, final drive gear, hydraulic systems and motor gear boxes. The results of the analysis shall be forwarded to the Project Manager upon receipt together with any proposals for remedial action where pollutants have been identified. The Contractor shall forward to the Project Manager within 3 months of contract award details of proposals for the routine periodic preventative maintenance programme that shall be adopted during the tunnelling operation. A nominated person shall be responsible for ensuring compliance with all preventative maintenance procedures. GENERAL TUNNELLING CONSTRUCTION REQUIREMENTS Perform tunnel construction to minimize movement of ground in advance of, around and above the tunnel; to control water and water inflow and attendant soil transport; and to minimize settlement, subsidence and heave of the ground surface, structures, and utilities above and close to the tunnel for ground conditions that are to be encountered as described in the Works Information and Site Information. Conduct tunnelling operations in a controlled manner so that settlement action levels are not reached. Unstable Conditions Procedures: Whenever there is a condition likely to endanger the excavation or adjacent structures, notify the Project Manager immediately and perform work on a 24-hour a day basis, including weekends and holidays, until such condition is resolved and eliminated. Briefings are to be given to mining gangs prior to tunnelling on the procedure for dealing with unstable conditions. Maintain clean working conditions inside the tunnel by continuously and promptly performing housekeeping to remove muck and grout spills, rubbish and other debris. A driving parameters check sheet shall be provided daily to the mining crews to allow the drive to be controlled and monitored. ELECTRONIC DATA ACQUISITION, VISUALISATION AND REPORTING SYSTEM (DAVARS) The Contractor shall supply a computer-based Data Acquisition and Visualisation System’ DAVARS which can be used for the preparation and distribution of reports, This system shall fulfil the following main specifications. Extent and scope of DAVARS The DAVARS shall handle data and digital pictures, as minimum but not limited to, of: • The Tunnel Boring Machine (TBM), • The tunnel mucking system, • The reporting system, as agreed with the Project manager for Ring Reports and Shift Reports Thames Water Utilities Limited August 2008 Page 27 of 38
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