The pipes, generally between 450 and 1,300 mm diameter, and buried 2-4 m underground, suffered significant structural damage in the 2011 earthquakes in Christchurch.
The pipes, located under streets in and around the Christchurch city centre and in nearby Lyttelton, carry wastewater and stormwater to the Bromley treatment plant.
MacDow Fletcher, a part of the Stronger Christchurch Infrastructure Rebuild Team (SCIRT), is undertaking repairs and rebuilds on approximately 5 km of brick barrel wastewater and 5.5 km of stormwater pipes.
MacDow Fletcher contractors will enter street manholes and then use robotic technology to move material into the pipelines.Article continues below…
A machine will line the pipes with a spiral-bound material to seal and strengthen them, and any collapsed sections will be excavated and replaced.
Rib Loc and Rota Loc technology will be utilised to install liners in round stormwater brick barrels.