Largest circular precast weir wall chamber installed

The CPM Group has supplied the UK’s largest circular precast weir wall chamber to the prestigious Erith Park development, as part of the £60m phase 2 programme of drainage and enabling works. Ground worker and civil contractor, O’Keefe Construction took delivery of the precast weir wall chamber in June after the off-site solution was made at CPM’s Pollington works in Yorkshire following their new production facility that was built last year. The precast concrete weir wall chamber was delivered with a hydro-brake® fitted, complete with a preformed base and inlet holes that were formed prior to delivery to suit the site’s exact requirements. Once the weir wall was lifted into place, the connecting pipework was installed, saving O’Keefe installation time and benefitting from the open excavation being closed quicker. The weir wall was needed in such a large chamber (3660mm) due to the head and flow rate requirements, which were 4.81m head and a flow rate of 174 litres per second and a precast option was needed due to the pressure on the stainless steel hydro-brake® inside the chamber.

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