Auckland Council’s Healthy Waters department awarded McConnell Dowell the St Marys Bay and Masefield Beach Water Quality Improvement Project – one of the first of several projects that will reduce the number of overflows in Auckland from 100 per year on average to 20.
The project will include the installation of nearly 2 km of new pipeline, with approximately 1,120 m of the alignment to be tunnelled using a new Herrenknecht microtunnel boring machine.
The 1.8 m ID reinforced concrete pipes will be jacked into place, while the final 25 per cent of the pipeline will be constructed from high-density polyethylene and will form the outfall, which will be joined offsite and lowered into place on the seabed in a controlled sink.
Only 25 per cent of the pipelines will be installed using traditional dig and lay methods.
McConnell Dowell Managing Director New Zealand and the Pacific Islands Fraser Wyllie said the use of trenchless technology will reduce disruption to both the land and nearby stakeholders.
“McConnell Dowell has considerable expertise in this area having constructed all of the largest marine outfalls in New Zealand,” he said.
“We are proud to be able to help improve water quality in our harbours and beaches and help provide a better life to communities.”
Construction is set to commence in January next year and is tabled for completion in late 2021.
For more information visit the McConnell Dowell website.
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