WGA Transport Capability Statement

Our Experience—Transport

Geelong Road Bridge Rehabilitation—$5m CIVIL, GEOTECHNICAL AND STRUCTURAL

Mount Emu Creek Bridge Rehabilitation—$2m CIVIL AND STRUCTURAL

Calder River and Ford River Bridge Inspections and Upgrades— $8m CIVIL, GEOTECHNICAL, STRUCTURAL AND TRAFFIC WGA undertook Level 2 assessments of two 11.5m regional bridges in Cape Otway on the Great Ocean Road, which were nearing the end of their design lives. In addition WGA carried out a road safety audit for the roads leading to and after the bridges. Both bridges' timber deck and girders were found to have insufficient capacity to support the bridge’s 75% SM1600 loading, an Australian Standard for vehicle masses up to 120t. The superstructure was inadequate to resist braking loads, and had excessive pile settlement under vertical loading. A full replacement was recommended for both bridges.

Spout Creek Bridge— $10m CIVIL, GEOTECHNICAL AND STRUCTURAL

WGA was engaged to undertake detailed design of the Geelong Road Bridge over Kororoit Creek, a high priority bridge upgrade. The scope included assessment of the bridge inspection report, and development of a design solution for deck strengthening, barrier upgrades and bearing replacement works, all of which had to consider construction staging under live traffic environments, other access constraints and whole of life costs. The complexities came from the required change to bridge articulation following the removal of the stepped joints. This in turn required the piers and their foundations to be assessed for the new movements they will experience. The bearing reset required a complete understanding of the current bridge position and what the change in articulation will mean to them. Our performance on the project and commitment to client engagement led the client to invite WGA to tender for additional road works projects.

WGA provided a load assessment to 75% SM1600 loading for Mount Emu Creek bridge which crosses over the creek on Princes Highway in Panmure. The loading equates to vehicles of 120t, and required structural strengthening to achieve. WGA’s scope included design of the roads, bridge structure and road safety barriers, which was achieved by assessing the existing bridge’s condition to identify areas requiring rehabilitation and improvement. The design prioritised safety to construct and traffic staging, as the road could not be closed during construction. The result is a robust, sustainable design that caters for future traffic loading and safe pedestrian and cyclist movements.

Spout Creek is a two-lane 15m wide road bridge on the Great Ocean Road, originally constructed in 1953 and widened in 1972. Regional Roads Victoria engaged WGA to undertake condition investigations of the bridge, then develop design and construction options to increase the bridge load rating to meet 75% compliance with the SM1600 traffic loading standard. WGA completed load bearing assessments using historical condition assessment reports and drawings. Several rehabilitation options were developed which were then considered for constructibility and developed in partnership with the client and contractor. The key challenge was ensuring the proposed design allowed this popular tourist route to remain open during construction. Once a shortlist of rehabilitation options was reached, WGA undertook geotechnical investigations to assess the abutment and wingwall foundation bearing capacity, abutment and wingwall backfill strength parameters, approach barrier foundation parameters including lateral load and vertical load assessments, and shear and pull-out capacities of the existing rock anchor dowel bars. WGA also completed an Australian Road Research Board (ARRB) Level 2 Condition Assessment of the existing bridge structure.

Birkenhead Bridge Re-decking— $3.73m PAVEMENTS AND STRUCTURAL

The Birkenhead Bridge over the Port River is an iconic piece of infrastructure and a State Heritage item. One of only a handful of bascule (opening) bridges in Australia, it has provided a critical connection between Port Adelaide and Birkenhead since opening in 1940, carrying approximately 15,000 vehicles a day. Engaged by the Department for Infrastructure and Transport, WGA undertook the design of a new lightweight FRP roadway decking for the bascule spans of the bridge, a first for bascule bridges in Australia. The design incorporated innovative wearing surfaces fused to the FRP during the manufacture process. The decking was subject to rigorous testing, ensuring its integrity during bridge openings in hot weather events.

TRANSPORT CAPABILITY STATEMENT

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