Owner
London Underground
Client
Halcrow
Cost
£480 million GBP
Timeframe
August 2007
— January 2010
Services performed
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.
Description
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.
Geology
London Clay Formation (over-consolidated, very stiff to hard clay)
Location
London, UK
Highlights
- First time application of sprayed concrete lined overbridge
- First large tunnel construction job under UK's Crossrail Act
- First use of spray applied waterproofing membrane for London's infrastructure
Installation of steel transfer beam
General arrangement of sprayed concrete overbridge.
Removal of existing backfilled structure
Northern line concourse tunnel with cross passages
Overview of new tunnel works
Excavation and support of Northern line concourse tunnel