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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> - PT200<br />

identify any trends in readings that demonstrate that ground movements are in<br />

accordance with predictions and control of the stability of Works.<br />

PT241.19 The Contractor shall observe, record and analyse the readings in a monitoring<br />

report to establish trends in movement and shall provide a copy of all recorded<br />

results to the Project Manager. He shall make available results to the Project<br />

Manager in accordance with an agreed programme.<br />

PT241.20 The format of reporting of monitoring results is to be agreed with the Project<br />

Manager prior to commencing construction activities. Typically it is to contain:<br />

a) Graphical representation of settlement of buildings/ground over time and<br />

annotated with tunnel / excavation progress.<br />

b) Excavation data including material excavated.<br />

c) Settlement and excavation data trends.<br />

PT241.21 Hard copy results of the settlement arrays or monitoring points are to be made<br />

available to the Project Manager on a daily basis when the tunnel face is within<br />

25m of the array and weekly thereafter in excel and pdf format.<br />

PT241.22 Monitoring of settlement, scheduled defects and defects arising during the<br />

course of the Works shall continue at agreed intervals for a period at least until<br />

the end of the defects date or other such time as agreed by the Project Manager.<br />

PT242<br />

PT242.1<br />

PT242.2<br />

PT243<br />

PT243.1<br />

PT243.2<br />

PT244<br />

PT244.1<br />

DEFECT AND CONDITION SURVEYS<br />

Pre and post construction defect surveys shall be carried out to a programme and<br />

methodology as submitted to and agreed with the Project Manager for all<br />

structures and key utilities identified as being within the 5mm settlement contour<br />

as shown on drawings <strong>6LYG</strong>-<strong>A1</strong>-02131 to 02141.<br />

The Northern Outfall Sewer (NOS)<br />

The Lee Tunnel alignment follows the route of the existing Northern Outfall Sewer<br />

(NOS) for approx 4.5kms. The Contractor shall carry out a visual Condition<br />

survey of the sewer as soon as practical after the award of Contract. Record<br />

drawings of the sewer are included in the Contract for information (Section 6).<br />

The survey shall be organised by the Project Manager in liaison with the Thames<br />

Water Operations Division who will provide all safety cover and review Method<br />

Statements for the survey as required by the Thames Water procedures for Entry<br />

into Confined Spaces and Live Sewers. The Contractor shall provide a Northern<br />

Outfall Sewer Condition Survey Report which shall be submitted to the Project<br />

Manager who, in liaison with the Contractor, will agree any protective measures<br />

to the NOS that will have to be carried out.<br />

TEMPORARY ELECTRICITY SUPPLY FOR TUNNEL CONSTRUCTION<br />

The Employer has agreed to make available a supply of electricity to the<br />

Contractor for the Construction of the Works. Details of the proposed supply are<br />

described in Schedule 3 Clause 4 of the Works Information. The Contractor shall<br />

confirm that the supply will be in accordance with his specific requirements. If the<br />

supply is insufficient the Contractor shall make his own arrangements for the<br />

provision of alternative additional power requirements.<br />

Emergency Generator: Supply an emergency standby generator of such capacity<br />

and configuration as to automatically and instantly come on line in the event of a<br />

power failure, without interruption, and to operate ventilation, lighting, pumping,<br />

communications and other critical systems.<br />

TREATMENT OF ARISINGS<br />

Spoil Processing requirements for Slurry TBM<br />

Thames Water Utilities Limited August 2008<br />

Page 34 of 38

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