HOBAS Pipes jacked at Victoria Harbour, AUS

In Melbourne, HOBAS scored with high-quality Jacking Pipes De 427: Here, a HOBAS Sewer System was installed by means of jacking. The Victoria Harbour project was realized just meters away from the iconic and environmentally sensitive Yarra River. Having been polluted by contaminated stormwater for years before the government implemented an effective treatment system, the banks of the Yarra River still contain contaminated soil. Since this soil is quite expensive to dispose of, this was a critical point when it came to the choice of a suitable pipe and installation method. The general ground conditions were also quite problematic: Silty clay and wet sand required a non-porous pipe with a low coefficient of friction to ensure the jacking loads would not build up in case the sticky ground clamps around the pipe. The design engineers and installation contractors evaluated all alternatives and eventually opted for HOBAS Jacking Pipes De 427 SN 100000 with stainless steel couplings: Featuring the largest possible inner diameter in relation to their outer diameter, HOBAS Jacking Pipes kept the excavated soil to a minimum and were also optimal for the difficult soil thanks to their smooth and almost non-absorbing outer surface. Most of the 270 m long pipeline was installed in sections up to 7 m deep with a thrust force of approximately 80 kN, the longest drive was 76 m. Surprisingly enough, the tunnelling contractor encountered an unexpected obstacle during the jacking process: a large timber pile suddenly showed up along the alignment of the jacking track, and there was no other option than to jack the HOBAS Pipes straight through the middle of it. The sewer has been successfully completed, on time and within budget. The builders can now carry on with erecting the highly sought after, multi storey apartments that will deliver some of the most beautiful harbour views in Melbourne.