Tottenham Court Road Station Upgrade Execution

Owner
Immersed Tube
Client
Halcrow
Cost
£480 million GBP
Timeframe
March 2011 — January 2016
Services performed
Design of SCL tunnels and access shafts linked to both Central and Northern line. Supervision during construction.
Description
The major upgrade to the LU Tottenham Court Road Station has been proposed to relieve congestion, achieve step-free access and modernise the station. The major elements of the station upgrade comprised a new enlarged sub-surface ticket hall, a fire-fighting access / emergency escape shaft linked to both Central and Northern lines, a triple escalator barrel, and concourses to the Northern and Central lines. In the latter concourse two new overbridges were included to lead to the platforms via new stairs and lifts. For the tunnelling works, a particularly challenging part was to design and construct the two SCL overbridges over the operational Central line.
Geology
London Clay formation
Location
Cut & Cover

Highlights

  • First sprayed concrete lined overbridges over operational platform tunnels
  • Concourse Tunnel excavated as multiple stage side drift tunnel
SCL side drift tunnel

SCL side drift tunnel

Aerial view of the construction site

Aerial view of the construction site

Sprayed Waterproofing Membrane

Sprayed Waterproofing Membrane

SCL Crosspassage

SCL Crosspassage

SCL Tunnel, overbridging operational Central Line Tunnel

SCL Tunnel, overbridging operational Central Line Tunnel

SCL Excavation through existing Structure

SCL Excavation through existing Structure