As a result of the devastating Queensland floods of January 2011, the Jellicoe Street Bridge (over Gowrie Creek) in Toowoomba was damaged to such an extent that it was un-trafficable.  Brandon & Associates were responsible for the replacement bridge design and associated structural analysis, working closely with Toowoomba Regional Council.  The original bridge was a precast concrete structure consisting of a 3 x 7m spans.  A new single 24m span bridge was designed for the crossing to increase the clear waterway area under the bridge and remove the piers within the main stream, avoiding future damage from large objects such as tanks/trees.

After conducting an initial structural assessment of the flood-damaged bridge, cost estimates were prepared for Toowoomba Regional Council to assist with application for NDRRA funding.  In addition to this, Brandon & Associates was responsible for the relevant authority applications, coordination of services relocation, structural design of the bridge structure and civil design of roadworks, drainage, guardrail and pedestrian access.

Due to the high-profile nature of the project, representatives from three consultants, plus the contractor were involved in collaboratively managing and delivering the project.  Brandon & Associates was heavily involved from design to completion, having a hand in the preparation of contract and tender documentation, tender assessment and award, contract administration and supervision during construction.  Effective community consultation and liaison with stakeholders was key to ensuring the project’s success.

Being one of the city’s major thoroughfares, Brandon & Associates were tasked with creating an innovative solution to safeguard against the threat of similar natural disasters.  Lifting the existing trunk water main and relocating this within the bridge infrastructure and increasing the cross-sectional flow area of the creek achieved this.  The new bridge structure was also designed to be single span, rather than 3-span, which maximised the creek’s cross-sectional flow area.  The project was delivered under a Risk Assessment Maximum Price (RAMP) contractual arrangement.


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