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DOCK DIVE: Birse Construction is tunnelling under historic docks as part of a £14.8M wastewater scheme in Birkenhead, Merseyside. The firm is using a Lovat TBM to drive a 2.1m diameter, 178m long tunnel beneath the Alfred Dock to connect two, 28m deep and 4.5m diameter shafts forming part of the Lower Mersey Basin project for North West Water. As well as the tunnel, the company is involved in construction of a pumping station and extensive modifications to an existing screening ...

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