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> - PT100<br />
PT100<br />
PT100.1<br />
PT100.2<br />
PT100.3<br />
PT100.4<br />
PARTICULAR TUNNELLING SPECIFICATION - INTRODUCTION<br />
So far as the <strong>Specification</strong> for <strong>Tunnelling</strong> may conflict, or be inconsistent, the<br />
specifications shall prevail in the following order of precedence:<br />
• <strong>Particular</strong> <strong>Tunnelling</strong> <strong>Specification</strong><br />
• <strong>Specification</strong> for <strong>Tunnelling</strong> (BTS/ICE 2000)<br />
• <strong>Particular</strong> Civil <strong>Specification</strong><br />
• CESWI<br />
Clause numbers for 'tunnelling' specifications are prefixed with a 'PT', i.e.<br />
PT112.1.4 etc. For consistency, the 'PT' prefix shall be deemed to apply also to<br />
all sections and clauses in the <strong>Specification</strong> for <strong>Tunnelling</strong>.<br />
Clauses for the main tunnel 7200mm diameter are prefixed PT2XX, the 3.05 ID<br />
Abbey Mills Connector Tunnel “TBM and <strong>Tunnelling</strong>” PT3XX, for the precast<br />
concrete segmental tunnel linings PT4XX, for the EPDM gaskets to the precast<br />
concrete segmental tunnel linings PT5XX and for the segmental shaft linnings<br />
PT6XX.<br />
This <strong>Specification</strong> for <strong>Tunnelling</strong> covers all <strong>Tunnelling</strong> Works and Segmentally<br />
lined Shafts within the scope of Works for this Project .<br />
PT100.5 Diaphragm Walls are specified in the <strong>Particular</strong> Civil <strong>Specification</strong>:-PC 3.15.<br />
PT100.6<br />
PT100.7<br />
The Contractor shall refer to the <strong>Particular</strong> Civil <strong>Specification</strong> for the requirements<br />
for all structures not specifically referenced in this specification.<br />
The Lee Tunnel is a long tunnel drive predominantly in flint laden chalk at high<br />
water pressures as described in the Geotechnical Baseline Report. The tunnel<br />
route prevents any direct access to the TBM from the surface. For this reason TW<br />
considers that the design, performance & operation of the TBM is one of the<br />
major risk mitigations on the Lee Tunnel.<br />
This specification should be considered as a MINIMUM requirement.<br />
Thames Water Utilities Limited August 2008<br />
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