Published Date: 27 April 2020
Tender Status: active
Tender Opening Date: 27 April 2020
Tender Closing Date: 4 May 2020
Award Date: n/a
Contract Start Date: n/a
Contract End Date: n/a
Contract is suitable for SMEs: Yes
Contract is suitable for VCSEs: No
Official Journal of the European Union (OJEU) Contract Type: Works
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 Works
The Hammersmith Pumping Station (HAMPS) Inlet Channel forms part of a live sewage pumping station infrastructure. It will remain operational throughout the duration of the project. This is a gravity-fed storm relief pumping station, with no physical or mechanical means of isolating the two sewers entering the Inlet Channel wet weather, thus all works are weather-dependent.
In order to ensure safety of the working teams, BMB have implemented a series of real-time catchment sewer monitoring along with computer modelling and weather forecast modelling tools which form part of the safe system of works (more details can be provided on request). Within the Inlet Channel, two temporary weir walls were installed, which are interconnected with a series of flumes to divert the flows through the works area (referred to as dry zone), effectively creating a cofferdam within the sewer environment
BMB JV are required to construct 4no elements of additional benching structures within the HAMPS Inlet Channel (highlighted in Figure 2), as follows:
1. Benching constructed on top of the base slab - 8m log, 2m wide (at base) with the outer face sloping towards the north wall at 45o, 750mm high. The subcontractor is to design, supply and install the formwork for this element. B16 dowels and face tension reinforcement bars (at 150mm c/c) will be supplied by BMB but will need cutting / bending and fixing by the subcontractor - no reinforcement drg is available at this stage but it is envisaged to have less than 100mm B16 bars.
2. Mass section of mass benching on top of the existing wall benching - upstream of the temporary weir wall. The section will have curved faces - BMB will provide the formwork design and polystyrene Cordeck infill panels made to required shape - (combination of RDM / Cordeck formwork) - the Subcontractor to provide the remainder materials for the formwork and assemble it.
3. Mass section of mass benching on top of the existing wall benching - upstream of the temporary weir wall. The section will have curved faces - BMB will provide the formwork design and polystyrene Cordeck infill panels made to required shape - (combination of RDM / Cordeck formwork) - the Subcontractor to provide the remainder materials for the formwork and assemble it.
4. Bullnose' mass benching installed on top of the existing slab, against the wall section between the two sewer portals. This section will be curved in multiple directions - BMB will provide the formwork design and polystyrene Cordeck infill panels made to required shape - (combination of RDM / Cordeck formwork) - the Subcontractor to provide the remainder materials for the formwork and assemble it.
Please note that entry upstream of the upstream temporary weir wall (items 2 and 3) is only possible during the safe tide window (+/- 2hrs from the low tide at Hammersmith) - a spreadsheet with exact tides for May and July was attached for reference. As north wall benching (item 1) is not restricted to low tide working, the Subcontractor's programme should allow for overlapping the activities such the low tide window is used for the upstream works and the remainder of the shift can be used for constructing Item 1 benching as well as all enabling works.
Returned quotations will be evaluated by BMB JV's (BAM Nuttall, Morgan Sindall PLC & Balfour Beatty) Procurement team in conjunction with our design and engineering teams.
Quotations will be evaluated based on;
Cost
Timeliness of return
Adherence to and demonstration of understanding of the drawings and specifications provided at this point.
Provision of accurate product specifications to accompany the quotation.
Supplier experience of similar projects,evidence of this will be requested should the initial quotation be of interest.
Should the candidate supplier be shortlisted they will then be contacted directly by a member of the BMB Procurement Team within two weeks of shortlisting to discuss the requirement in detail.
BMB Joint Venture (BAM Nuttall, Morgan Sindall PLC & Balfour Beatty)
Hammersmith Site
Contact name: colin smith
Address: 130 Wilton Road
London
SW1V1LQ
UK
Telephone: 07976181302
Fax: n/a
Email: [email protected]
Price Range: n/a
