Description of the goods or services required
The Thames Tideway Tunnel project (the Project) will control CSO discharges by intercepting and diverting combined sewage flows into a new storage and transfer tunnel. The main tunnel will run from Acton Storm Tanks in west London to Abbey Mills Pumping Station in the east, where it will connect to the Lee Tunnel, which will transfer the combined sewage to Beckton Sewage Treatment Works for treatment. The Project extends from Acton Storm Tanks in west London, to Abbey Mills Pumping Station in east London. The Project includes associated works at Beckton STW, Shad Thames Pumping Station and Bekesbourne Street.
The geographic layout of the Project and local authorities through which it passes is shown in Figure 1.
The Project comprises:
i. a main tunnel which will capture and store combined sewage from CSOs along its route and transfer it to Abbey Mills Pumping Station, from where the Lee Tunnel will transfer it for treatment at Beckton Sewage Treatment Works
ii. 11 connection tunnels, which will link flows from CSOs to the main tunnel.
i. five main tunnel Worksites (drive and/or reception sites)
ii. 16 CSO Worksites
iii. two System modification Worksites Thames Tideway Tunnel
iv. works at Beckton Sewage Treatment works.
The Main Works West - Contract 405: all works from and including
the Acton Storm Tanks shaft to and including the Carnwath Road
Riverside shaft, as well as the Frogmore connection tunnel from
Carnwath Road Riverside shaft to King George’s Park shaft.
Supply of Rail Turnouts and Crossovers
BMB would like three options to be priced:
Provide a price for the supply only of the modules disassembled and in parts to the Carnwath Road site.
Provide a price to supply the modules disassembled and in parts to the Carnwath Road site with the supplier providing on site surface assistance with the assembly of the Turnouts and Crossovers.
In addition to Option 2 provide a price with assisting fitment of each module in the tunnel. BMB will lift the modules down the shaft and transport them into their desired location in the tunnel. All prices returned shall clearly state day rates for fitters.
Please note Option 3 requires fitters to have TSTS and 6151 accreditation.
• The crossing has been designed to run parallel with the tunnel gradient. The drawings attached to this ITT will be updated in due course but will give sufficient information at this time to price effectively.
• Durbar plate shall be used beneath crossing sections and open mesh on straight sections. Open mesh will be used on the inside of track and on the ramps.
• Pandrol fastenings will be required for beams on straight sections these will be supplied by BMB to the successful supplier.
• BMB will supply the rail Turnouts and straight rails directly to the supplier from BMB’s rail supplier.
• As a clear and separate line return a price for conducting a trial assembly of each module all fitment together off site. When modules are assembled BMB should be given the opportunity to inspect the completed works.
• A lifting frame will be used to lift modules when required. A design will be provided in due course by BMB and then the supplier will price the supply of the lifting frame in accordance with the design.