Thames Tideway Tunnel - C405 Main Works West - Slipforming to Shaft at Carnwath Road

Descriptions

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. Scope of the subcontract works: Specific requirements BMBJV (Contractor) require a specialist Subcontractor to undertake the construction of the shaft secondary lining slipform works, Price to be based on the following scope information found here within: Construction Details The shaft slipform details are •Wall thickness is 600 mm thick. •Slipform will commence at +61.797m •Slipform will complete at +92.155m •Shaft dia pre slipform 26.225m •Shaft dia post slipform 25.025m (0/-25mm) Included within the scope BMB also require the design, supply, operate, supervise, assembly and disassembly of sliding formwork including costs of steel shutter, decks, specialist equipment and all necessary specialist engineering and operating staff to complete the works. Also include for method of placement of concrete and all associated equipment required.