Following the extensive damage to the existing ‘Bridge 11’ at 126kP on Rio Tinto’s Deepdale Line in Pannawonica during the February 2009 floods, Calibre Global was engaged to replace the bridge. Atlantic Civil was engaged to design and supervise the construction of two 20-metre span Super-Cor steel arches and wire wall, whilst NRW-NYRL JV were awarded the construction contract.
The arches are the largest buried corrugated steel arches installed to date in Australia and have the capacity to sustain a flood of similar magnitude that damaged the original bridge. The upstream and downstream facing arches contained cobblestones in galvanised wire frames as part of the mechanically stabilised earth retaining wall system.
Adding to the complexity of the project, there was a requirement to preserve an existing pool and maintain and open waterway during the construction process.
The total on-site time was 120 days, which included tracklaying. In addition to this, the arches were positioned to enable the temporary bypass rail embankment to be removed before the onset of the 2009 / 2010 wet season.
The project was completed within eight months of agreeing the design solution to rectifying the damaged bridge.
Mining Photography was engaged by Atlantic Civil to capture this fast paced project using time-lapse photography. The resulting video is shown below.