Hydraulink optimises pipe safety for McConnell Dowell’s Watercare record length project
New Zealand construction leader McConnell Dowell Constructors Ltd has selected the quality hydraulic hose, fittings and 24/7 service backup of Hydraulink to optimise the safety of New Zealand’s longest pipe jacking project. The Hunua 4 watermain project, commissioned and managed by Watercare Services Ltd, is a 31km pipeline through South and Central Auckland to help meet growing demand, increase the system’s capacity, ensure uninterrupted supply, and provide resilience to natural disasters. Watercare, an Auckland Council-controlled organisation, engaged McConnell Dowell to design and construct Section 11, the final section of the pipeline, from Market Road to the Khyber Pass Reservoir. A strong emphasis was placed on minimising disruption to communities along the pipeline route. Using mainly micro-tunnelling methods, McConnell Dowell constructed a 3.5km watermain using a tunnel boring machine (TBM) to drive and install 2,500mm ID jacking pipes between six shafts, before lining the tunnel with a 1,575mm OD steel pipe. The pipe jacks are the longest ever completed in New Zealand. McConnell Dowell recently (July 2020) celebrated the completion of the second drive of Section 11. McConnell Dowell’s TBM broke through at Khyber Pass Rd, setting a record of 1,216 metres for the longest single drive in the southern hemisphere by a TBM greater than 3 metres diameter. McConnell Dowell utilised a world-class TBM from Germany – a 55-tonne Herrenknecht – to excavate the 3m diameter tunnel required. To minimise community disruption, 80% of the pipeline construction was trenchless, and McConnell Dowell selected an alternative pipeline route that moved construction away from residential areas and ecologically sensitive sites. Hydraulink has more than 400 service outlets throughout New Zealand, Australia, and Pacific Islands, which bring essential hydraulic hose, fittings and safety-compliant and traceable service expertise to industries requiring prompt, quality 24/7 service either on or off site. Hydraulic hoses are like […]