Bank Station Capacity Upgrade - Pile Interceptions

Owner
London Underground
Client
Dragados S.A.
Cost
£563.8 million GBP
Timeframe
August 2013 — ongoing
Services performed
Design of tunnels where they intercept with existing building foundation piles (i.e. at four building locations).
Description
Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. The capacity upgrade includes the construction of 540 metres of running tunnel intercepting with existing foundation piles at four no. building locations. A bespoke solution was developed for each of the buildings and the building impact was assessed in detail.
Geology
The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.
Location
London, GB

Highlights

  • Interception with 4 no., minimum 1.5 m diameter, end bearing piles
  • Interception with 1 no., 0.9 m diameter reinforced concrete friction pile
  • Interception with multiple smaller concrete friction piles.

Running tunnel intercepting with existing foundation piles

Exposure of pile during running tunnel construction