Bridges

The new concourse at Redfern Station spans over ten platforms at the southern end of the station. It was constructed using super tees with a cast in-situ deck supported by piers founded at the platform level. The superstructure supports a trapezoidal steel frame that forms the canopy and walls of the concourse. Freyssinet developed an installation methodology that alleviated the need for cranage during railway possessions and allowed for installation of the steel canopy during full rail operation. Freyssinet's scope included design, supply, and operation of a system of carrier frames running on temporary tracks across the bridge deck. The carrier frames facilitated launching and installation of the structural steel canopy in ten segments, each weighing between approximately four and seven tonnes. The architectural design of the canopy steelwork resulted in each segment being unique in shape and size. This presented challenges for the design of the carrier frames and meant that they were required to be adaptable in order to support the segments in different locations during each phase of launching. The installation methodology was developed in order to accelerate the overall construction program for the Redfern Station Upgrade project. Implementation of a segmental launching methodology resulted in successful completion of the southern concourse canopy structure in a much shorter timeframe when compared with a traditional stick-built methodology.