Inspire : Public Works Sept Oct 2012
49 PROMOTION Kembla Watertech recently completed the rehabilitation of wastewater assets in Linley Point on the Sydney Harbour foreshore. This complex project was undertaken as part of the Sydney Water's SewerFix (Tidal Ingress) program, which provides solutions to salt water ingress into Sydney Water wastewater systems in a number of catchments across Sydney. Many of the wastewater pipes that were laid closer to tidal areas had saltwater ingress and were underwater due to tides. The saltwater caused the pipes to deteriorate (corrode) and was resulting in additional operating costs. In Linley Point, wastewater pipes were laid along the shoreline, with maintenance holes surrounded by water. Our project team closely examined the tide charts and planned the work depending on both high and low tides. Site appraisals, stakeholder meetings, and detailed environmental plans were also needed due to the high level of community and environmental risk associated with this work. The wastewater pipe were experiencing signi cant in ltration, so all the work had to be done at low tide, when the in ltration was reduced. Conversely, preparation work, like transporting equipment and machinery to site, had to be done at high tide via a barge. Sca olding was brought in on a barge at high tide and eight working platforms were set up around maintenance holes during low tide. Nearly 600 metres of 225 millimetre-diameter wastewater pipes were rehabilitated by the EX lining method. This system involves the expansion of a continuous coil of specially formulated PVC pipe to form a tight tting liner in the existing host pipe. EX Liner is manufactured exclusively for Kembla in Sydney, Australia. Wastewater junctions were repaired by the Tiger T method, which is a resin-impregnated T section for structural repair and sealing of pipe connections. Maintenance holes were rehabilitated inside and outside to prevent major in ltration. For more information about Kembla Watertech's products and services, please visit www.kemblawatertech.com.au The prince of tides 1 . Loading onto the working platform from the barge. 2. Working from the barge.
Public Works July Aug 2012
Public Works Nov Dec 2012