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Concrete In Australia : September 2008
PROJECT REPORT ????????? Townsville Queensland ??????? Toll Holdings ???????????????? Toll Holdings ??????? Structural Systems Townsville Rail Facility Rectification Structural Systems have constructed various container pavements throughout Australia, with the Townsville Rail Facility being one of the largest of these projects. The 50,000m2 rail facility was originally completed in May 2005, with all external hardstand pavements originally constructed with Asphalt. certification of works of the completed works. Due to the nature of works and the need for the facility to become operational prior to the Christmas freight surge, it was decided construction would be done in two phases. Two thirds of the facility was to be built prior to Christmas, with construction starting in the middle of September 2006, with 16 pours complete by the end of November. The initial channel was in use during December, allowing the client enough access to manage the freight logistics during this period. The second phase was done during February 2007, and completed over a three week period. Structural Systems were able to install the post-tensioning to ensure a four-pour per week cycle, effectively completing 50, 000m2 of concrete hardstand within a 10 week period. Due to problems with the hardstand after the original construction phase, including wearing failure of the surface, large areas of the facility became inoperable, thus the clients new facility could not handle the required traffic as planned. It was decided in May 2006, only 1 year after operation, that the entire surface required replacement. After consultation with Structural Systems, Toll Holdings decided a Post tensioned hardstand to be the most cost effective and durable solution. The Hardstand area consisted of three ‘640m long channel’ running parallel to the existing rail lines. Each slab was approximately 25m wide x 80m long, thus the entire facility was constructed in 24 No. pours. Structural Systems scope of works included Post tensioning design and documentation of the hardstands, installation of Post tensioning and conventional reinforcement, and The success of this project has resulted in Toll also constructing a 15,000m2 upgrade to the Rockhampton Rail Facility, again with the assistance of Structural Systems, and it is expected Toll will continue to construct facilities using post tensioned concrete slabs, due to the efficiency of design, speed of construction and long term durability of the hardstand, which dramatically reduces long term maintenance and rectification, as was experienced with the original asphalt solution. 34 Concrete in Australia Vol 34 No 3