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

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Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT217.5 PT217.6 PT217.7 PT217.8 PT217.9 a) Interlock to allow individual or group operation of shove rams for segment erection. This shall include safe switching between TBM operator and segment erector operator. b) Safe lifting alarms. c) Vacuum monitoring for segment lifting d) Return to pick up segment and automatic location and pick up of segments. Provide safe working areas as required to ensure for tunnelling personnel during the erection of the segments. The erector shall be fitted with a tapered single shear pin to locate into the central socket, within the segments. The pin shall be designed to impart the necessary cross joint closing force for the proposed gaskets, this shall be designed to transmit this force into the central section of the segment by a replaceable plastic sleeve to prevent damage to the segment. The erector shall be provided with 2 laser pencils that will align with dimples set into the segment intrados to ensure location of the shear pin into the segment. Operation of any functions using the erector remote control (pendant) shall be achieved only by simultaneous selection of an enabling button and the function button. The TBM segment erector shall be able to retrieve segments for replacement, if damage to a segment has been incurred whilst building the ring. PT217.10 The erector shall be provided with a means of safe transfer of power cables and hoses from static to rotation section by reel, or other approved system. PT217.11 The erector shall be provided with proportional control of main movements. PT217.12 The erector shall be provided with a pick up head with axial, rocking and slew movements. The rock movement shall be equal to about the “x” & “y” axis of the segments. PT217.13 All hand held electrical equipment, such as the pendant controls for the segment erector, shall be in a watertight enclosures and the control circuit protected by a Ground Fault Interrupter Circuit. PT217.14 The erector shall be equipped with an integral bearing and seal drive system rated for 10,000 hours. PT217.15 Vacuum erectors shall be tested prior to the commencement of every shift, by holding a segment plate for a minimum of 20 minutes without loss of suction. PT217.16 The vacuum system shall be fitted with a pressure sensing device that will detect loss of vacuum and prevent operation and lifting of segments, should vacuum fall below 0.8Bar. PT217.17 The Contractor shall provide a probe drill facility. PT217.18 The erector shall have mounting facilities to hold and direct a probe drill to align with angular ground treatment holes and probe holes within the TBM. PT217.19 The erector shall be provided with clockwise and anti clockwise rotational movements of ± 220º spaced equally about the invert of the tunnel. PT218 PT218.1 ERECTOR BRIDGE The Contractor shall provide details of the erector bridge that demonstrates that the design is such that the support of the TBM ancillary equipment shall bridge the segment lining installation and grouting areas such that the first bearing on to the newly built lining takes account of the grouting time and the designed rate of gain of the grout strength. The bridge shall run on rail track supported by brackets fastened into the tunnelling. Thames Water Utilities Limited August 2008 Page 14 of 38
Lee Tunnel, Contract No. 6LYG/A1 PT – Particular Tunnelling Specification - PT200 PT218.2 PT218.3 PT219 PT219.1 PT220 PT220.1 PT220.2 PT220.3 PT220.4 PT220.5 PT221 PT221.1 PT221.2 PT221.3 The erector bridge shall be provided with an articulated towing connection to the TBM with load indicating and interlocked features. These features shall include a link to the shove rams which will immediately stop the shove should excessive loads be transmitted to the towing connection. A platform shall be provided for proof grouting directly beyond the tailskin. SEGMENT MAGAZINE The segment magazine shall include the following features:- a) A minimum capacity of one ring. b) Be reversible for removal of damaged segments from the ring building area. c) The base of the magazine shall be designed such that there is adequate access for grouting to the invert plates. d) Control of the magazine functions shall be by a trained driver who shall be positioned at a fixed station with clear site of movements. e) The base structure shall be designed such to allow a clear access walkway to the TBM tail area. f) There shall be sufficient clearance from the tunnel invert to maintain and take oil samples from the segment feeder. TBM – LINING INTERFACE Concrete segments and associated items shall be designed for anticipated ground and water loads and environmental conditions on the completed tunnel. The Contractor shall ensure that the segments are compatible with its selected construction equipment, means, methods and procedures including, but not limited to alignment control, handling, erecting and grouting. Maximum ram thrust contact pressure at any point and any time on the lining system ram thrust shall not exceed 50% of the segment 28-day compressive strength. Thrust pads are to be designed such that they shall not damage gaskets or segments. Design thrust ram shoes to be consistent with the segment design and installation procedures, such that they do not introduce eccentric loads to the segments Design TBM system to allow complete backfill grouting of the annulus between the concrete segments and excavated surface, taking account of hydrostatic pressures and overburden loads. CONTROL AND INTERLOCKS The TBM cutter head shall be prevented from moving at any point during any maintenance or entry. An interlock should be provided from the control cabin to allow remote inching operation of the cutter head. The Contractor shall establish safety procedures, for acceptance by the Project Manager, which will include, among other issues, a procedure to ensure that all personnel have evacuated the cutter head and front chamber before any movement is undertaken. This provision is intended to assist cutter tool changes with local indexing of the cutter head. The cutter head drive shall have fail-safe braking system to prevent inadvertent movement. The shove rams shall be controlled from the main control cabin during the excavation cycle and from remote stations during the ring building cycle. An interlock shall be provided to prevent duplicate operation of the shove rams. All erector load-holding functions shall have a fail safe alarm system. Rotational drives shall be fitted with fail safe brakes. Thames Water Utilities Limited August 2008 Page 15 of 38
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080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow

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