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Woronora Bridge. Sydney. Australia

Client
Roads and Maritime Services (RMS, formerly RTA)
Sector
Transport
Services
Engineering ExpertiseInfrastructure Construction
Duration
December 1998-March 2001

Woronora Bridge. Sydney. Australia

Woronora Bridge

Woronora Bridge. Sydney. Australia

Woronora Bridge

Woronora Bridge. Sydney. Australia

Woronora Bridge

Woronora Bridge. Sydney. Australia

Woronora Bridge

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.

Project facts

A number of innovations were developed during the bridge construction:

Development and installation of precast concrete deck ribs to stabilise the superstructure webs during casting of concrete

Development of dual purpose bearings as laminated rubber bearings in lieu of pot bearings (used, not only for launching, but also for permanent bridge support). This engineering approach had never before been achieved on a bridge construction of this size, scale and load regime.

Development of a two-stage casting yard in lieu of the normal single-stage casting yard.

Defining the launch geometry so that the bridge could be cast on a circular curve.