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Customer: Auckland Council Healthy Waters Contract: Construct Location: Henderson, Auckland   |
Fast Facts
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With a carefully designed tunnelling methodology and construction program to minimise impacts, we successfully delivered the Corban Reserve Stormwater Upgrade in Auckland. The new facilities allow for future growth in the area and protect and enhance the local ecology.
This was an environmentally and socially complex project, with homes, schools, native flora and fauna, and parklands intertwined with our worksites.
Shaft locations for the tunnelling were chosen to reduce the number required, and their size was designed to limit noise and vibration. Even so, all three shafts were located a few metres from residential properties, which meant regular and proactive communications about upcoming works.
The new 713 m long stormwater pipeline was installed in a single drive between Border Road and Imperial Place using a customised 2100 mm diameter micro tunnel boring machine (MTBM). This was the same MTBM that we'd used on the successful St Marys Bay project in 2020.
A second 240 m long, 450 mm diameter pipeline was installed using horizontal directional drilling, from a temporary shaft between the main Border Road/Murillo Place and the heart of Murillo Reserve.
Fish baffles were installed inside the pipeline to enable native eels, fish, and other freshwater species to travel up and down the pipeline, and around the network.
Once the new pipeline works had been completed our team decommissioned the old stormwater pipe.
The team also constructed three new footbridges at Border Road Esplanade, Murillo Reserve, and between Imperial Place and Spode Place. Several walkways and native planting were installed within Border Road Esplanade and Murillo Reserve, beautifying the area.
