Utilities & Nuclear

Thames Tideway (West), Hammersmith Pumping Station

The Thames Tideway Tunnel is London's answer to a Victorian sewer network that can no longer cope, and the Hammersmith Pumping Station forms part of its western section. TAG was brought onto the joint venture between BAM Nuttall, Morgan Sindall and Balfour Beatty to construct the interception chamber, a fibre-reinforced concrete structure that would sit at the heart of the new pumping infrastructure.

Over a contract running from April 2018 to February 2021, TAG's scope covered the capping beam, wailing beam, and both permanent and temporary props holding the excavation stable, followed by the west side slab, wet well slab, liner walls and internal walls that make up the chamber itself. Walkways to the vertical duct and new lintel beams completed the structural package.

Every one of those elements needed rebar installed to specification, including dowelling into the secant piled walls already in the ground, before blinding and permanent concrete could go in. It's precise, sequenced reinforced concrete work carried out deep in a live excavation in the middle of a residential London street.

Delivered under an NEC Option A & E contract worth £2.635m, the completed interception chamber now forms part of the infrastructure keeping London's river cleaner, one of the most technically demanding structures TAG has built for the capital's water network.

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