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Concrete In Australia : March 2012
6 Concrete in Australia Vol 38 No 1 Production ramps up in road project precast facility Production is ramping up in the precast facility built specifically by the Hunter Expressway Alliance for the eastern section of the Hunter Expressway. e 13km eastern section includes 800m of high bridges through the Sugarloaf Ranges and is being delivered in an alliance contract with NSW Roads and Maritime Services (RMS), formerly known as Roads and Traffic Authority; iess; Parsons Brinckerhoff; and Hyder Consulting. e precast facility is producing 566 deck segments and 168 column segments for three bridges that will be constructed using the balanced cantilever method. Critical survey controls in the precast facility were required to manufacture the match cast segments, where each segment needs to match the segment before it. Within the building, each segment mould has its own survey control tower -- large diameter concrete columns, set up so surveyors can come in every morning and measure heights and positions to make sure moulds can be set to millimetre precision. Further within the shed, reinforcing steel awaits assembly in a jig before being lifted into the mould, along a production line progressing through a daily schedule of work. "Around 3pm each day, the concrete pouring will start into the two column segment moulds before moving onto the three deck segment moulds," said David Long, the alliance s manager for the precast yard. "With 566 deck segments and 168 column segments, this will be a constant process as the deck installation starts." e viaducts are being constructed using a balanced cantilever method. Sub- alliance partner VSL has carried out the assembly of the gantry and will supervise the building of the decks for the three twin viaducts. An aerial view of the precast facility built for the eastern section of the Hunter Expressway. Gold Members