Hobson Bay Tunnel Project, New Zealand

Watercare Services awarded McConnell Dowell, in joint venture, the construction of the Hobson Bay Tunnel Project located in Auckland, New Zealand. The project was to replace a 90 year old sewage pipe that crosses the Bay, on Auckland's waterfront Tamaki Drive. The tunnel offers greater sewerage capacity to cater for projected population growth in the area and prevents wastewater overflows into both the Bay and Waitemata Harbour basin. The replacement of the existing wastewater pipe also opens up the Bay for recreational boating. The project scope consists of a 3 km long, 3.8 m internal diameter tunnel which is driven approximately 30 m below the bay floor; construction of three shafts of approximately 35 m to 40 m in depth (23 m, 8 m & 10 m internal diameters); surface reticulation/connection works; and demolition of the existing sewer pipeline that crosses the Bay. This project uses a Tunnel Boring Machine by Lovat of Canada, and construction techniques are designed for a combined firm rock and soft substrate. The 23 m diameter shaft includes considerable mechanical and electrical works (the supply and installation of six 1MVA pumps), while all three shafts also require a significant amount of concrete works. McConnell Dowell has worked closely with Watercare Services to develop a stakeholder management plan to ensure bay users were not impacted during the construction of the new tunnel - especially during the demolition of the existing sewer line. Construction of the ...



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