The Forest Hill Timber Bridge Replacement Project was awarded to Doval by Queensland Rail as a Design and Construct project. The project involved replacing the old timber rail bridge with a concrete bridge of increased width and length.
From the onset the major factor dictating the successful completion of the project was the requirement to complete the majority of works during a 48 hour track closure, and in so doing ensure minimal delays to train movements.
Doval engaged BG&E as the Designers for the project and they were heavily involved in ensuring that the 48 hour shut down was achievable, as well as providing key considerations for the quickest and most efficient ways of constructing and installing key precast components during the erection of the bridge.
Another challenge posed by the project was the requirement to install 8 No. 30m deep bored piles only several metres from the existing operational bridge structure.
This extreme depth was required from a design perspective to ensure adequate bearing was achieved by socketing the piles into existing bedrock. The installation of these piles was made even more difficult by some unanticipated geotechnical conditions involving fissured clays.
The installation of the bridge was successfully achieved during the prescribed 48hr window much to the satisfaction of the Client. The contract was also completed without safety or environmental incident despite significant risks being posed by the nature of the works.
Forest Hill Timber Bridge Replacement at 88.220km Main Line
Forest Hill, Qld