Our Experience—Transport
Bridges We deliver comprehensive bridge design services across Australia, ensuring safe, functional, and cost-effective structures for any crossing—creeks, rivers, roads, freeways, and rail lines. Our expertise encompasses the entire bridge life cycle, from inspecting, maintaining, and strengthening existing and historical bridges, to planning, feasibility studies, concept design, and detailed design for new builds. Specialising in temporary works design, we consider construction methodologies from the earliest project stages. This holistic approach enables us to simplify complex challenges, collaborating closely with clients to deliver enduring infrastructure that serves communities for generations.
Karel Avenue Road Bridge over Freight Rail— $25m CIVIL AND STRUCTURAL Completed in 2021, WGA provided the detailed design for the widening of Karel Avenue to provide two lanes in each direction at the interchange with the Roe Highway. The project included the duplication of Karel Avenue bridge over the Roe Highway, a wider and longer bridge no. 1595A for Karel Avenue over the Thornlie to Cockburn rail line and a shared path underpass extension. Bridge no.1595A adopted a single span solution with no piers, which provides flexibility for the location of future rail lines and constitutes a safer option with regards to rail traffic. The structural solution chosen for the north bridge abutment is a soldier pile wall with a deadman anchor system. The wall comprises 900 mm diameter continuous flight auger (CFA) piles. A sprayed concrete wall is provided in between and in front of the piles at the north abutment. This wall provides soil retaining function and constitutes the facing of the abutment. The duplication of the existing bridge no. 1482 with the new bridge no. 1857 is achieved with a two-span structure of approximately 58 metres between abutments with a one-way cross fall. The new bridge accommodates two 3.5m wide traffic lanes and a 1.5m wide shoulder.
Majors Road Interchange Bridge Widening— $120m CIVIL, ELECTRICAL, HYDROGEOLOGY, PAVEMENTS, STORMWATER, STRUCTURAL, TEMPORARY WORKS, TRAFFIC AND WATER SENSITIVE URBAN DESIGN Majors Road carries approximately 13,200 vehicles per day and is an important arterial road providing a key connection between Lonsdale Road and Main South Road. Working with Acciona, WGA's scope as the lead designer included road alignment, drainage, pavements, earthworks, utilities, bridge structures, barriers, ITS structures, traffic modelling, traffic signals, road lighting and temporary works. A key part of the project was the widening of the existing Majors Road bridge. The two-lane composite steel-girder bridge was upgraded and modified to accommodate two lanes of traffic in each direction with dedicated right turns for access to the new interchange entry ramps. The project is all about improving access to the Southern Expressway and reducing travel time to and from the city.
O-Bahn Tunnel & Torrens Pedestrian Bridge— $160m CIVIL, DIGITAL, GEOTECHNICAL, HEAVY LIFTING, STRUCTURAL AND TEMPORARY WORKS
Part of the South Australian Government’s investment in building a stronger public transport network, the O-Bahn City Access Project included the creation of centrally aligned priority bus lanes along Hackney Road, and a dedicated 675m bus tunnel providing quicker, more reliable access for O-Bahn buses into the city. WGA led the structural design including: ● Geometric design for the tunnel, ramps and portal areas. ● Sheet pile walls, base slab and guideways constructed beneath the water table. ● Precast plank roof of the tunnel in Hackney Road, Dequetteville Terrace, Rundle Road and the Parklands.
● New section of First Creek Culvert. ● Tunnel drainage and pump stations.
WGA was the structural designer for the 78m long shared use path bridge across the Torrens River, located 15m downstream from the existing Hackney Road Bridge. The bridge comprises three continuous spans of 26m and was designed with integral abutments and piers to eliminate bearings and movement joints, reducing maintenance requirements.
The bridge pier comprises a V-shaped pier to match the existing which is supported on a large pad footing.
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TRANSPORT CAPABILITY STATEMENT
TRANSPORT CAPABILITY STATEMENT
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