Bruce Highway Safety Package, Pineapple Hill, near Maryborough

This $13m project for the Department of Transport & Main Roads (TMR) involved upgrading the busy Bruce Highway to provide a 1m central median, pavement widening and strengthening and multiple overtaking lanes. The works were mostly undertaken under live traffic and were located at a number of highway sections between 12 and 20 kms  south of Maryborough.

Key scope of works:

  • Road widening and reconstruction
  • Upgrade intersection works
  • Extensive cut to fill earthworks
  • Pavements (including heavy duty CTB), bitumen & asphalt (including deep-lift AC), kerb & channel, guardrail
  • CTB sidetrack construction around multi-cell 2100*2100 box culvert
  • Some specific key quantities included:
    • 20,000 tonne of asphalt
    • 20,000 m3 of road base
    • 7,300m3 of 400mm deep rock blanket subgrade treatment
    • Multiple pipe and box culverts, up to 2.1 x 2.1 box  units
    • 1300 m of guardrail

 Notable aspects of the project:

  • Heavy, high-speed traffic environment – up to 12,000 vehicles per day, with 20% heavy vehicles
  • Extensive detailed traffic and construction staging planning and execution were required
  • Very poor ground conditions were overcome with rock mattresses, “Combigrid” reinforcing and extra depth pavement materials
  • A two-lane sidetrack with 12x 900 dia pipes and suitable for the heavy highway traffic was enacted at the largest culvert location
  • Management of weather impacts was a constant requirement, with consistent rain events throughout the works, especially during the AC works – and included effectively managing the effects of Cyclone Debbie in late March 2017, to successfully mitigate time and cost effects
  • All local stakeholders were satisfied with the minimal disruptions, including the commercial enterprises within the extent of the contract, who were not impeded by the construction and for whom better access was provided at no extra cost to the client
  • A number of value engineering options were identified by SGQ, including the following adopted measures:
    • Introducing a method to enable the guardrail to be readily installed through 250mm of deep-lift asphalt
    • The adoption of “Combigrid” over unsuitable ground sections.
    • Asphalt pavement night-works were introduced to expedite the program
  • Collaborative working was required with TMR, on the run, to address various construction and design issues, including the persistent wet weather and in ensuring best possible final ride quality
  • Positive relationships prevailed between the constructor and client teams throughout