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Concrete In Australia : June 2008
PROJECT REPORT ????????? Alfords Point, Sydney ??????? Roads & Traffic Authority, NSW ??????????? Abigroup ??????????? Maunsell Australia Alfords Point Bridge Duplication VSL Australia has just completed its works on the Alfords Point Bridge Duplication project in the south of Sydney. The new bridge is intended to relieve traffic congestion on Alfords Point Road increasing the existing 3 lanes that are operated in a tidal flow arrangement to 6 lanes as well as a pedestrian walkway The project was managed by the RTA, designed with the assistance of Maunsell and was constructed by Abigroup Contractors. The new bridge consists of a 445m long double cell box section that was constructed using an incremental launch technique. VSL’s scope involved the supply and installation of both permanent and temporary ground anchors to the abutments, supply and installation of post tensioning (169 tonnes strand), as well as the supply, installation and operation of the launching system including stress bar and associated components for the launching nose and end launching frames. VSL also supplied the elastomeric bearings to the project through its international partnership arrangements. Construction of the bridge deck commenced in mid 2007 and the last segment was cast and launched into place by VSL in March 2008. The construction of the bridge deck was broken into 23 segments, with a typical pour, stress and launch cycle of around 1 week. Each bridge deck segment contained twelve nine strand launching prestress tendons that coupled the segment to the previous segments. Stressing and launching of the bridge was carried out on the same day with stressing being carried out in the morning and launching in the afternoon. The VSL supplied launching system comprised of 2 sets of 330t braking jacks with 670t pushing jacks located on 31*15.2mm strand bundles. Oil delivery came via 2 control pumps that were backed up by 4 booster pumps. Each launch operation took approximately 5 hours to complete. 34 Concrete in Australia Vol 34 No 2