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Holborn Station Capacity Upgrade

Owner:
Client:
Service:
Feasibility study and conceptual design.
Estimated cost: Commencement:
April 01, 2014
Completion date:
Ongoing
Location:
Kingsway
London
WC2B 6AA
United Kingdom
Technical data:
Geology description:

London Clay and Lambeth Group formation, which may contain water-bearing sand channels.

Geology types:
Activity:
Categories:
Bid cost: Final cost:
£150 million GBP
Service areas:
Construction methods:
Tunneling under:
Description

Holborn is a London Underground station in central London. It is served by the Central and Piccadilly lines. Demand for both lines at Holborn is high. The principal design challenges are the close proximity of the proposed tunnels to existing operational tunnels, complex tunnel geometry and alignments, limited clearance to existing buildings, restricted work sites and strict settlement criteria. The lining system is a double shell lining with both linings considered part of the permanent load bearing structure.

3D visualisation of existing Holborn underground station
Archive photo of heading of escalator tunnel (1931)