Between the two individual sheet pile pits, a steel pipe was ‘pipe rammed’ at a depth of 3m by a specialist subcontractor. The reason for pipe ramming was to create a duct under the footpath, shoulder of the road and the large number of existing services above the rammed pipe which would have made traditional pipe installation methods tricky.

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The Southern Relief was then diverted by means of bypass pumping, the pipeline broke into and a new in-situ concrete Diversion Chamber and Pump Station was built, along with associated pipework.

 

Hunter Civil worked on this project under careful supervision by CPB Contractors who are the head contractor for the new large-scale multi-sport complex project in Christchurch.