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First sprayed concrete Crossrail tunnels complete

Crossrail this week revealed that the £14.5bn project’s first two sprayed concrete tunnels have been constructed under Finsbury Circus in the City of London.

The two, 4.5m diameter tunnels are temporary structures and will be used for compensation grouting, one of the ways that Crossrail plans to control potential ground movements caused by tunnelling.

The first sprayed concrete lining (SCL) tunnel measures 80m in length and the second is 100m long and they have been built as part of the construction of the new Liverpool Street Crossrail station.

The SCL technique will be used to build 12km of station platform tunnels, passages, access and grout tunnels along the Crossrail route where smaller, relatively short tunnels are needed.

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