Thames Tideway Tunnel - C405 Main Works West - Conveyor System MNTL-B

Tender description

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: a. tunnels: 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. b. Worksites: 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. Section 4: Scope of Works BMBJV scope of works on the Tideway project has been increased to include the construction of a connection tunnel between the CARRR shaft and the precast Main Tunnel B constructed by the Central Team. The design of the Connection Tunnel is being undertaken in an expedited manner to mitigate impacts on the overall project programme and scope under the original works that are ongoing. The connection tunnel will be constructed in the following phases: a) 55m 6.1m OD Pilot Tunnel drive. b) 55m 7.5m OD Enlargement Tunnel which includes the removal of the Pilot Tunnel.. BMBJV require a Subcontractor to provide a quotation to install and maintain a conveyor system which will undertake the transport of spoil from the internal shed bin to the external site bin. BMBJV aim to engage a Conveyor Subcontractor based on this ITT and subsequent quotation. The scope of the subcontract will be: A. Installation of sizer for SFRC Shotcrete / SFRC concrete / Grout / Clay and River terrace deposits will also be put through the sizer. B. Installation of chain conveyor (running from sizer inside the shed to conveyor outside the shed). C. Conveyor running approx. 100m to the external bin. D. Conveyor to take spoil from the 100m conveyor into the external muck bin. The Subcontractor shall comply with the requirements set out in the Works Information and BMB procedures. Additional information: BMB JV Sites (CARRR) BMB-JV Tideway West, Carnwath Road Riverside, Carnwath Road, London Borough of Hammersmith & Fulham, SW6 3HR