Kilcoy Bridge Replacement, SE Qld

Kilcoy Bridge Replacement, SE Qld (2019 – 2020)

This $4.3m contract for the Department of Transport & Main Roads (TMR), saw SGQ replace an 85-year-old timber bridge over Kilcoy Creek on the eastern fringe of Kilcoy township with a new pre-stressed deck unit bridge, as part of the federal government’s Heavy Vehicle Safety and Productivity Program. The contract included two-way side-track construction to enable the main works and the necessary roadworks approaches. The bridge is situated on the 11,000 vehicle per day D’Aguilar Highway route, with a significant volume of heavy freight.

Scope of Work

  • Full bridge construction works
  • Entailing 28m long deck units and driven precast piles
  • Extensive concrete works additional to the bridge
  • Major side-tracking, including twin 2400 diameter culverts
  • Bridge approach roadworks and widenings
  • Turnaround facility, with carparking
  • Install improved safety measures

Notable Aspects

  • Detailed planning and project management requirements
  • Project completed early despite works shut down in Feb 20 due to high rainfall/local flooding
  • Detailed traffic & construction staging planning & execution
  • Work over and within the environmentally sensitive waterway of Kilcoy Creek
  • Including careful management of dewatering systems and temporary and permanent scour protection works
  • Platypus environment management & aquatic salvage of fish were required
  • Noise & vibration management were required, including for driven piles (adjacent township residences)
  • SGQ and TMR worked together to ensure limited interruptions to road users and minimized impacts upon local residents, businesses, freight companies, school buses, emergency services and community groups
  • SGQ worked very collaboratively and constructively with TMR throughout
  • Value engineering options identified by SGQ included the following adopted measures:


    • Overall logistics extensively refined & optimised to minimise costs & works duration
    • All aspects of side-track design and logistics were refined & optimised – minimising costs & works duration and enabling the retention of a large culturally significant tree, that was originally planned for removal
    • Pavement design changes to improve impervious material in the flood plain
    • Optimisation of creek scour protection to suit ever changing site conditions
    • Silky oak trees within the clearing zone were donated to Caboolture Wood Crafters & Jinibara 

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