HS2 Main Works S1 & S2 - WP171 SCL Formwork
Published
Description
The scope for this package is the supply of SCL Formworks. SCS require lining shutters to construct cast insitu concrete tunnel secondary linings. The works will include: *Technical design *Design to British or European Standards. *Provision of calculations and drawings, including design of all temporary loads such as concrete pressure and uplift/floatation without penetrations through the shutter or waterproof membrane. *Provision of erection sequence /shop drawings *Manufacture and delivery of formwork to SCS jobsites, at multiple locations along the HS2 S1 and S2 contract. *Initial assembly of the system in the tunnel. *Buy-back of the system. The works are split in to 3no. separate packages: 1) Cross Passages a. Access limited to cross passage by openings in the TBM running tunnel of 2.850 x 1.900m b. Secondary lining invert will have previously been cast flat. c. Secondary lining thickness of ~250mm. d. Shutter internal dimensions ~2.7m high x 3.3m wide. e. Cast in a single pour. f. Cross passages varying in length from 5-5.8m. The shutter should be adaptable to suit this length, and the combined TBM horizontal driving tolerances from both bores g. Due to access limitations for mechanical lifting, the shutter should take into consideration UK manual handling legislation. h. Required for July 2022 2) Old Oak Common SCL Tunnels a. Secondary lining shutters to facilitate the construction of both the Upline and Down running tunnels concurrently (2no complete sets of panels and carriages required) b. Shutter internal dimensions ~10m diameter. c. Formwork to be adaptable for a range of profiles, with common arc sections and make up pieces. d. Cast in a single pour. e. Shutter suitable for pours ~10m in length. Adaptable for make-up pours f. Formwork to be carriage mounted and hydraulically operated. g. Secondary lining invert will have previously been cast flat. h. Secondary lining thickness of ~350mm i. Facing material suitable for up 20no. of pours, with no access to clean or oil, whilst still providing F2 finish. j. Required for April 2023 3) Euston SCL Tunnels a. Secondary lining shutters to facilitate the construction of i. both the Upline and Down Crossover tunnels concurrently (2no complete sets of panels and carriages required) ,internal dimensions ~10m diameter. ii. Cavern crossover of varying sizes (15m, 13m and 11m), formwork to be adaptable for a range of profiles with common arc sections and make up pieces where possible. b. Cast in a single pour. c. Shutter suitable for pours ~10m in length. Adaptable for make-up pours d. Formwork to be carriage mounted and hydraulically operated. e. Secondary lining invert will have previously been cast flat. f. Secondary lining thickness of ~350mm g. Facing material suitable for up 35no. of pours, with no access to clean or oil, whilst still providing F2 finish. h. Required for Jan 2024
Timeline
Award date
3 years ago
Publish date
2 years ago
Buyer information
High Speed Two (HS2) Ltd
- Contact:
- Procurement Team
- Email:
- procurement@scsrailways.co.uk
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