Birkdale B Catchment Upgrade
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Service: Trenchless Pipe Construction
Cost: $5.6M
Started: Jan 2010
Completed: Jun 2011
Client: North Shore City Council
Engineer: SKM-Opus
The Project was centred on the horizontal directional drilled installation of 1,036 metres of gravity sewer.  The associated commissioning works included manhole installation and several shorter pipeline installations.
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Setting New Standards

  • When completed it was the longest horizontal direction drilled installation of pipe in New Zealand.
  • First installation of FPVC pipe in New Zealand.
  • Drilling at depths up to 30 meters and grades as low as 0.5%.

Project Scope

  • Install 1,036 metres of product pipe through a pre-reamed 900mm bore.
  • Variable geological conditions encountered; ranging from hard sandstone to soft silts & clays.
  • Grades ranging between 0.5% and 2.0% were achieved using specialist locating equipment, tooling and software.
  • 24 meter deep manhole construction completed to check borehole alignment through deepest section.
  • First installation of Fusible PVC in New Zealand.
  • Due to restricted space conditions, pipe string was welded in five sections before being welded together during pipe pull.
  • Extremely sensitive environmental conditions.
  • Due to the size of the project there were numerous stakeholders.

Project Outcomes

  • A high standard of drilling was achieved; this is to date the longest horizontal directionally drilled pipe line in New Zealand.
  • This was the first installation of a fusible PVC pipe in New Zealand.  The benefits of installing this product over HDPE were enormous and contributed to the success of the project.
  • The project won a Contractors Federation Environmental award.  This showed the dedication the team had with respect to protecting the environment throughout the project.