080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow
080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow
080731 6LYG A1 Particular Tunnelling Specification ... - SCATnow
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Lee Tunnel, Contract No. <strong>6LYG</strong>/<strong>A1</strong><br />
PT – <strong>Particular</strong> <strong>Tunnelling</strong> <strong>Specification</strong> - PT300<br />
PT300<br />
PT301<br />
PT301.1<br />
PT301.2<br />
PT301.3<br />
PT302<br />
PT303<br />
PT303.1<br />
PT303.2<br />
PT303.3<br />
PT303.4<br />
PT303.5<br />
CONSTRUCTION OF THE 3.05m DIAMETER CONNECTOR TUNNEL AT<br />
ABBEY MILLS : SPECIFICATION FOR THE TUNNEL BORING MACHINE AND<br />
TUNNEL CONSTRUCTION<br />
SUMMARY<br />
The work of this Section includes, but is not limited to, providing all labour,<br />
materials, tools, equipment, and incidentals necessary for a tunnel boring<br />
machine and tunnel construction, in accordance with the Contract Documents.<br />
The work of this Section includes, but is not limited to, the following activities:<br />
a) Tunnel Boring Machine includes, but is not limited to: design, manufacture,<br />
furnish, maintain and testing of a tunnel boring machine for the express<br />
purpose of constructing TBM excavated tunnels.<br />
b) Boring Tunnel includes, but is not limited to: mining of tunnels, installation of<br />
precast segment tunnel lining, temporary tunnel facilities, geotechnical<br />
monitoring, control of ground loss, settlement and heave, and removal and<br />
disposal of excavated material.<br />
c) As-Built Tunnel Survey<br />
This is a performance specification. The Contractor shall be responsible for the<br />
selection and complete design of the tunnel boring machine and tunnel<br />
construction systems. The Contract Documents provide parameters and design<br />
criteria for this portion of the Work.<br />
REFERENCE STANDARDS<br />
See PT204 in “<strong>Specification</strong> for New Tunnel Boring Machine and Tunnel<br />
Construction”.<br />
DEFINITIONS<br />
TBM excavation: The construction of underground tunnels by mechanical means<br />
using a tunnel boring machine.<br />
Segmental tunnel lining: Precast concrete segments that are bolted together<br />
inside the TBM tail shield to form a gasketed, watertight tunnel lining ring. The<br />
lining shall be designed to withstand both handling loads and all ground and<br />
water loads. Refer to PT400 for the detailed <strong>Specification</strong> requirements the<br />
design and supply of the Tunnel Linings.<br />
TBM: As used in this Section, the term TBM means the total system of the tunnel<br />
boring machine including trailing gear and appurtenant support equipment,<br />
materials and any items of plant which are necessary for the sustaining of TBM<br />
excavation operations all to be designed in accordance with the requirements of<br />
this Section. The TBM shall have the ability to apply a sustained and controlled<br />
pressure on the tunnel face within a pressure bulkhead located behind the face<br />
to form a plenum under pressure with the remainder of the tunnel maintained at<br />
atmospheric pressure.<br />
EPBM: An Earth Pressure Balanced TBM with a pressure bulkhead located<br />
behind the face to form a plenum under pressure. Conditioners can be injected<br />
into the plenum to control the quality of the excavated material through a screw<br />
conveyor in closed mode and belt conveyor in open mode.<br />
SPBM: A Slurry Pressure Balanced TBM utilizing a controlled dense slurry in a<br />
pressure chamber in the head of the machine to stabilize the face and minimize<br />
settlement. The resultant slurry, with excavated material, is removed to the Slurry<br />
Separation plant by pumping.<br />
Thames Water Utilities Limited August 2008<br />
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