A collaborative approach to a sewer rehabilitation project

With a technically challenging sewer rehabilitation project to be completed, Hastings District Council sought a collaborative approach that would bring together the design team and construction company to achieve the best possible result. The outcome was the successful installation of some 2,400 metres of PVC sewer pipe via open cut trench, HDD and pipe bursting techniques in and around public streets and private homes in Havelock North.

This included a section of 44 metres of 300mm pipe with an invert of 5.7 depth metres and a pipeline route under a shared public driveway close to private homes. RESTRAIN? threaded joint SN16 PVC pipe manufactured in 1-metre lengths was used for this section and assembled inside the manhole prior to pulling into place with the HDD rig.

This paper reviews the project completed in July 2009 and looks at the installation process, selection of materials and impacts of the construction on the surrounding environs.