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Concrete In Australia : March 2008
Existing seawall prior to reclamation works. Summary of deck unit statistics. Location No of deck units Depth (mm) Lineal metres (m) Weight (t) Jetty 1073 L15 drive platform 171 Berth 4 396 Total 1640 800 450 500 25,278 2052 5138 32,468 23,700 1100 3000 27,800 over-the-top construction techniques. The reclamation work was awarded as a separate contract to BMD Group. This involved the relocation of 358 No. 5t Hanbars and 1246 No. 11.5t Hanbars and the manufacture and placement of 524 No. new 11.5t Hanbars. All rock armour was reused and fi ll material for the reclamation was sourced locally on site. The reclamation works were completed in April 2007, with much of the work being undertaken during the wet season. As the works involved the removal of rock armour and Hanbars from the existing seawall, there was a period of time during which the existing facilities were potentially exposed. Project risk mitigation strategies included a rapid construction program and partial construction of the new seawall in front of the existing seawall to provide some degree of protection prior to removal and relocation of the existing armouring. Bund 5A under construction. The effects of different wave conditions occurring at different parts of the site were considered, allowing the Hanbar size and density to be reviewed for different locations. The results of the physical modelling demonstrated that, in comparison with the existing seawall, the new seawall could be constructed with a reduced placement density of 5t and 11.5t Hanbars and still achieve the required immunity. Even though the length of seawall was slightly increased, it was possible to reuse the majority of existing rock armour and Hanbars with only a minimal number of new units required. Construction issues The contract for OL3 Offshore was awarded to John Holland, which is constructing the wharf and jetty using traditional Concluding remarks The DBCT 7X Project is not only a major project involving interfaces and interaction between multiple contractors but also has the complexities associated with brownfield work resulting in challenges to the designer and contractors alike. The project is ongoing with construction scheduled for completion late this year. Acknowledgements The design of the concrete structures presented in this paper result from the combined efforts of a team of structural engineers and drafters from Connell Hatch with input from the terminal owner (BBI) and terminal operator (DBCT Pty Ltd). The author gratefully acknowledges the roles of all parties and the permission of BBI to publish this paper. Concrete in Australia Vol 34 No 1 49