Gladstone to Monto Road Floodway Restorations

Gladstone to Monto Road Floodway Restorations, Qld (2020 – 2021) 

This $20m project for the Department of Transport & Main Roads (TMR) involved reconstructing multiple large floodways and their approaches, along a stretch of the Gladstone to Monto Road between Many Peaks and Kalpowar, NW of Monto. It entailed extensive earthworks, unbound gravel, foam-bitumen and concrete pavements and multiple large box culverts.

Scope of Work

  • Construction (& later removal) of four side-tracks to divert traffic temporarily
  • Earthworks for new road embankments and floodway approaches
  • Reconstruct nine concrete causeways
  • In-situ Foam-Bitumen Stabilisation (FBS) of floodway approach pavements
  • Two-coat seal works
  • On-site quarry pit & concrete batch plant
  • On-site water sources, utilising creeks and bores
  • Satellite internet established for site office
  • Extensive revegetation works
  • Some specific key quantities included:
    • 80,000 m3 of road excavations
    • 14,000 m3 of imported A1/A2 embankments
    • 5,200m3 Type 2.1 gravel (boutique grading for FBS)
    • 15,800m2 FBS pavements (lime & C170 bitumen)
    • 1 km of concrete road pavements 
    • 5,100 m3+ of site-batched reinforced concrete
    • 350 No. 2.44 x 1.5 x 1.2m reinforced concrete box culverts
    • 2,100 No. fish-baffles to culverts & wingwalls
    • Extensive ¼ to. and ½ to. rock armouring to prevent scour

Notable Aspects

  • Multi-site project works under traffic
  • Significant earthworks component
  • Relatively remote location with no internet/power/water/phone
  • Tight time-frame contract with NDRRA funding
  • Major concrete pavements and RCBC drainage works
  • Foam-Bitumen Stabilisation works
  • Established and operated on-site quarry, batch-plant and water-sources, including achieving all relevant approvals in a timely manner
  • Sensitive environmental/cultural heritage issues successfully managed
  • Extensive stakeholder & community liaison & management was required
  • This included working constructively with TMR, Gladstone/North Burnett Regional Council, local farmers (including in respect of earthworks supply and disposal), HQ Plantations (regarding their logging trucks traversing the sites), the Boyne Burnett Inland Rail Trail group and motorists
  • Positive, productive relationships were maintained between all construction delivery team members (SGQ, TMR and TMR’s Administrator, McMurtrie Consulting Engineers).
  • Value engineering options identified by SGQ included the following adopted measures:
    • Connection of concrete Floodways 12 and 13 – the original design left the short 70m gap between the two as flexible pavement, which would have been difficult to maintain
    • Removal of prime seal treatments at each site and replacement with C170 & 2% cutter followed by S2S PMB 2 coat seals

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