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Holborn Station Capacity Upgrade
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| Service: | Feasibility study and conceptual design.
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| Estimated cost: | Commencement: | April 01, 2014
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Completion date: | Ongoing
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| Location: | Kingsway London WC2B 6AA |
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| Geology description: | London Clay and Lambeth Group formation, which may contain water-bearing sand channels. |
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| Bid cost: | Final cost: | £150 million GBP
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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.
