WESTERN INTERCEPTOR STAGE 1 & 2A
Christchurch City Council
Open trench large diameter pipe installation
Christchurch City Council required 1959lm of 1600mm dia RCRRJ plasti-line gravity sewer to be installed over two stages as part of their upgrade of the sewer network.
March Construction adopted an open trench excavation utilising sheet piles and their hydraulic propping system which preloaded the ground before excavation to minimise any subsidence behind the sheets. Well point dewatering was installed along the entire length of the excavation to achieve a dry invert of the trench prior to the installation of the RCRRJ pipe.