Western Harbour Tunnel, Sydney, NSW, Australia
Aurecon is transforming Sydney Harbour, replacing dredging with TBM tunnel engineering to deliver a faster, safer and more sustainable second harbour crossing.
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The Seaford Rail Extension Project involves the construction of 5.7 kilometres of dual electrified track on Adelaide’s southern suburban railway line.
Aurecon was engaged to design the 1.2 kilometre Onkaparinga Valley Bridge which is an elevated rail bridge, and a key element of the rail extension.
Aurecon was responsible for the concept through to detailed design which included a complex geotechnical assessment in liquefiable soils, piled foundations, piers and superstructure.
Our role also included lighting and provision of earthing and bonding, along with noise assessment of the entire route. The bridge is an incrementally launched, post-tensioned, box girder bridge with multiple 52 metre spans.
The unusual articulation accommodated the complex behaviour of rail track associated with long ballasted deck bridges. The abutment and launch bay structures were employed as the main anchors against massive braking and earthquake loads.
Aurecon’s preferred design required fewer piers, with a single span across the river and confinement of construction equipment away from the sensitive valley floor. A launched medium span bridge proved the most cost-effective design and minimised environmental impacts compared with a conventional super tee option.
The project was delivered for the South Australian Department of Planning, Transport and Infrastructure with construction commencing in 2011 and completion in 2013.
Aurecon is transforming Sydney Harbour, replacing dredging with TBM tunnel engineering to deliver a faster, safer and more sustainable second harbour crossing.
Aurecon's active transport design expertise supports TfNSW to create a seamless, unobtrusive, step-free ramp and cycleway across Sydney Harbour Bridge.
Aurecon's expertise in tunnel systems helps design the replacement of the Burnley Tunnel's low-voltage cables to keep the city's busiest road links moving.
