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Bank Station Capacity Upgrade - Impact Assessment

Owner:
Client:
Service:
Assessment of impact on existing cast-iron and precast concrete tunnel linings (in total approximately 300 assets.) including empirical and finite element calculations.
Estimated cost: Commencement:
January 01, 2013
Completion date:
Ongoing
Location:
London
London
EC3V 3LA
United Kingdom
Technical data:
Geology description:

The geology comprises London Clay formation overlain by Quaternary superficial deposits comprising river terrace deposits and alluvium which are generally overlain by made ground.

Geology types:
Activity:
Categories:
Bid cost: Final cost:
£563.8 million GBP
Service areas:
Construction methods:
Tunneling under:
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. A staged, risk-based approach was used to efficiently assess the affected existing assets and determine an appropriate mitigation and monitoring scheme. Empirical methods and complex numerical models were used at the different stages of the assessment, to understand the risk to the existing railway and how they could best be managed while minimizing disruption to the station and its users.

Existing escalator at Bank Station
FEA model of existing (blue) and new (red and pink) SCL tunnels