WestConnex: Stage 3B – Rozelle Interchange is the final stage of WestConnex. This project delivers an underground motorway linking the M4-M5 Link Tunnels to the City West Link and Victoria Road.

It removes cars from Victoria Road by providing a bypass between Iron Cove Bridge and Anzac Bridge. It connects to the future Western Harbour Tunnel and includes 10 hectares of new public open space. BG&E provided structural, civil, and construction engineering services. Specifically, our team designed the temporary civil and structural components to allow site access, establishment, and tunnelling.

Some of the key elements in our scope of work included

• Three site compounds at Rozelle, City West Link, and Iron Cove Link.
• All temporary drainage and water quality requirements.
• Two new intersections and staging requirements from City West Link into the Rozelle site compound.
• Temporary flood modelling for the Rozelle site compound.
• Three declines to tunnel portals, including structural design of:
• the retaining elements and the geometry for the 60 metre ramp into the decline portal to a depth of eight metres,
• a 154 metre ramp into the decline portal to a depth 14.5 metres, and
• a 100 metre ramp into the decline portal to a depth of 13 metres.
• Foundations for three acoustic sheds for noise attenuation of construction activities.
• City West Link temporary staging structures.
• Two span plank road bridge with a high skew and horizontal curves used to support traffic on the temporary ramps to divert traffic for the staged demolition and construction of the Victoria Road bridge.
• An eight span steel pedestrian bridge to provide temporary pedestrian access around the demolition and construction works at City West Link.

Achieving practical completion in late 2023, a key highlight of the project was the delivery of beneficial urban design outcomes – including returning 10 hectares of parkland to the local community, new and upgraded pedestrian and cyclist infrastructure, and connectivity between Annandale, Lilyfield, and the Bays Precinct.