Warringah Freeway Upgrade - Construction engineering

EIC Activities’ construction engineering team is supporting the CPB Contractors project team to deliver the temporary works associated with the construction of the Falcon Street shared user bridge as a part of the Warringah Freeway Upgrade project in Sydney, NSW.

EIC Activities is leading the detailed design delivery for the temporary works associated with the staged construction of the shared user bridge.

The temporary works designs include the transverse restraint, longitudinal restraint, torsional restraint and temporary propping for all stages of construction.

About the bridge

The Falcon Street shared user bridge is a steel box girder bridge with a cast-in-situ concrete deck consisting of six girders with a total length of approximately 230m.

The first girder to be installed was a central span being Girder 3 on 10th June 2024 with an approximate weight of 110t and lifted using a 750t mobile crane.

Subsequent installation of girders will work their way out from Girder 3 towards the abutments at each end.

The bridge construction methodology requires the bridge to be fully constructed prior to the installation of the permanent bearings.

EIC Activities designed transverse, torsional, and vertical restraints providing stabilisation to the shared user bridge at all stages of erection and allowing for the longitudinal expansion of the curved bridge.

A pair of steel outrigger arms stressed together through the permanent concrete pier extended above the capital with retractable arms to meet the webs of the girder for ease of installation.

About the project

CPB Contractors was selected by the NSW Government to deliver the Warringah Freeway Upgrade project in a 70:30 joint venture with DT Infrastructure.

The Warringah Freeway upgrade is key to a city-shaping network of roads that will reduce congestion in Sydney, as population and transport demand grows. The project will improve traffic flow, simplify the complex road corridor, and create better connections.

The project includes:

• upgrading four kilometres of the Warringah Freeway between North Sydney and Naremburn
• improving interchanges with Falcon Street, including a new northbound on ramp at High Street
• improved public transport links, with a continuous southbound bus lane from Miller Street to the Sydney Harbour Bridge
• around 2.5 kilometres of new and upgraded cycleways and pedestrian paths, integrated with public transport networks.
• Construction commenced in 2022 and is expected to take approximately five years to complete, subject to the detailed design and construction program.