Work Description:
- Expansion of the London Northern Line Underground network, with a 3.2 km extension of the line and 2 new stations (Battersea and Nine Elms):
- Secondary lining for Type 1 tunnels: Tunnels (constant section) connecting the new branches to the existing line loop at both Kennington Green and Kennington Park.
- Secondary lining for Type 2 tunnels: TBM launch shafts (TBM launch chambers), with a significant variable section gradient (trumpet sections) at Battersea Station.
Work Carried Out:
- On-site construction and concreting of the secondary lining over the primary lining in SCL tunnels (Sprayed Concrete Lining).
- Tunnels at Kennington: Tunnels spanning 280 m with secondary lining, constant section, and junctions with shafts.
- TBM launch shafts at Battersea: Tunnels spanning 154 m with secondary lining and variable sections (truncated).
- Design, manufacture and supply of a special custom-made tunnel lining formwork carriage by the TecoZam Design Department.
- Specialized on-site execution, from concrete pumping operations to the final form removal operations of the tunnel carriage.
Singular Own Resources:
- Design, manufacture and supply of a customized solution for tunnel formwork carriage system adaptable to both constant sections and variable sections with an intelligent design and easy adaptation and installation.
- FLO (Ferrovial & Laing O'Rourke) and TecoZam simplified the tunnel geometry and alignment to optimize and improve the final design of the Battersea launch shafts.
- Expert and professional labor and supervision to carry out the operations in the complete concreting cycles.
Relevant Performance:
- Leading secondary lining performance in the UK, concreting a tunnel section every 24 hours (in 12 hour shifts).
- Average of 1 concreting per day, i.e. 12 meters of concrete pouring every 24 hours for constant sections.
- Average of 1 concreting every 2 days for variable sections, including reconfiguration of the tunnel formwork carriage and complete concreting.
- Costs and program reduction due to the early completion of the scopes.
On-site construction and concreting of the secondary lining over the primary lining in SCL tunnels (Sprayed Concrete Lining).
