Full project details
The Woronora River Bridge, when completed, was the largest incrementally launched bridge in the Southern Hemisphere with horizontal and vertical curves.
Innovative design and construction methods were used to complete this award-winning, four-lane 521m long superstructure and to overcome restricted site access and environmental, climatic and geotechnical challenges.
Rising 36m above river level, the bridge was constructed on a horizontal radius as well as a sag curve. It consists of a 4m deep post-tensioned concrete hollow box girder and features both longitudinal stressing of the box and transverse prestressing in the top slab. The superstructure was constructed in 19 segments without temporary piers, and it reached its final destination within an accuracy of 2mm.
In addition to the main concrete superstructure, a 3m wide shared pedestrian walkway and cycleway was suspended below the northern deck. Further work involved the construction of the bridge approaches, including earthworks, stormwater drainage, traffic signals, pedestrian walkways, property adjustments and landscaping.
The team had to overcome geological design issues, stability of high rock cuttings, ongoing design development and a 150-day delay due to extreme wet weather. Despite this, work was completed three months ahead of schedule.
The Woronora Bridge provided a much-needed link between the growth areas of Menai and the transport hub of Sutherland in southern Sydney, reducing traffic congestion and improving access for emergency services.