Fibreglass Valve Chambers
Valve chambers are required to be installed underground alongside pump stations in earthquake liquefaction zones in Christchurch. They protect the valve equipment yet provide access for servicing. Earthquakes largely destroyed the wastewater network of Christchurch, and these valve chambers were an integral part of the re-build.
The flanged underground valve chamber was designed to withstand the large liquefaction loads imposed by the devastating shallow earthquakes. The valve chambers are anchored to both an underground concrete slab and the fibreglass pump station, restricting differential movement in the event of an earthquake.
To date installations have withstood dozens of smaller aftershocks without damage.