McConnell Dowell to complete major watermain

30 January 2017

Auckland water and wastewater services provider Watercare has awarded McConnell Dowell the Design & Build contract to construct Hunua 4 Section 11, the last section of a major new 32km long water main stretching from South Auckland to the city.

The Design and Construct contract is for the installation of approximately 3.5km of 1.6m diameter steel pipe between Newmarket and Khyber Pass, one of the busiest commercial areas in Auckland.

Due to the site constraints including challenging geotechnical conditions, multiple stakeholders and major arterial roads, the pipeline will be installed largely using a pipejacking methodology, in which a tunnel boring machine ‘drills’ under the ground and segments of pipe are pushed (jacked) in behind it as it moves forward. Once completed, the pipe jacks will be the longest ever completed in New Zealand.

McConnell Dowell’s solution was to propose an alternative route to that originally expected by Watercare and methods of construction that significantly reduce the construction impacts on local people, businesses and other stakeholders. Using the latest, state-of-the-art technologies, the team will install the pipe using trenchless methods almost entirely below and within the road or motorway corridor. The route of Section 11 travels along Ranfurly Road then beneath Manukau Rd, under the Southern Motorway and beneath Khyber Pass Rd to the Burleigh St water storage tanks. The route also disconnects the work from the City Rail Link project, which will be underway nearby in Eden Terrace, and avoids potential impacts on culturally or environmentally significant areas.

Phase One (Design Development) is due to start in early 2017 with construction due to commence in 2018.

About Hunua 4

The Hunua 4 water main is one of the largest bulk water supply pipelines in Auckland at up to 1.9 metres in diameter. When completed it will travel from Manukau, through Mangere and Onehunga, One Tree Hill, Greenlane, Epsom and Newmarket, joining the network in Khyber Pass.

As demand for water grows in Auckland, it will ensure sufficient capacity in the network to continue an uninterrupted, high-quality water supply. The pipeline will also offer resilience if there was ever a natural disaster and will allow maintenance without major disruption to supply.

See more about the Hunua 4 Watermain Project, 4 Watermain Project.aspx




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