— January 2010
Design of numerous temporary sprayed concrete lined shaft and tunnel structures, and the waterproofing system for the upgrade of the existing London Underground Tottenham Court Road Station.
Currently over 150,000 passengers use the station daily and with the completion of Crossrail in 2017, passenger numbers are expected to increase to over 200,000. The tunnels are of diameters between 4.0m and 11.0m and typically consist of a temporary sprayed concrete primary lining, a spray applied waterproofing membrane and a cast-in-place concrete secondary lining. Multiple transitions and interfaces to existing LU structures make for a challenging design and construction project under the busy streets of central London.
London Clay Formation (over-consolidated, very stiff to hard clay)