The Tottenham Court Road Station is being upgraded to increase capacity so as to better accommodate current and future commuter needs. At the same time, the upgrade will minimize passenger journey time and improve the quality of access within the station. The upgrade will include a new concourse tunnel, escape tunnels, cross passages, interchange tunnel, and connector stub tunnels.
Gall Zeidler Consultants was responsible for conducting a Category 3 Independent Design Check of the Sprayed Concrete Lining / New Austrian Tunneling Method (SCL / NATM) for the project. This check included evaluating the geotechnical conditions and design parameters, construction sequences, excavation and support details, construction details, numerical analyses, waterproofing details, monitoring proposals and a review of the designer’s hazard and risk assessments.
London, United Kingdom
2008 – 2011
Concourse Tunnel, Cross Passages, Escape Tunnels, Stub Tunnels, Interchange Tunnel
Concourse Tunnel: 34.5 feet (10.5 meters) Wide, 35.5 feet (10.8 meters) High
Cross Passages: 16.5 feet (5 meters) Wide, 20 feet (6 meters) High
Escape Tunnels: 16.5 – 20 feet (5 – 6.5 meters) Wide, 19 – 20 feet (5.8 – 6 meters) High
Fill, Terrace Gravels, London Clay, Lambeth Group
Estimated US $176 Million
Halcrow Group Limited
London Underground, Ltd. (LUL)