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Dawson Highway, Calliope Range Deviation


PROJECT OVERVIEW

The Dawson Highway connects the industrial centre of Gladstone to the Leichhardt Highway and provides a direct link to southern capital cities.

CMC was awarded the contract to construct a new 4.5 kilometre, four lane road through the Calliope Range near Biloela, approximately 60 kilometres south-west of Gladstone.

SCOPE

The scope of work largely included bulk earthworks, pavement construction, challenging tie-ins that were over one kilometre and grade separated by up to 2.5 metres under live traffic, Super-T girder bridge with insitu post tensioned central headstock, major retaining walls, and concrete barriers. A major challenge for the team was drilling and blasting through rock with excavations within 25 metres of a high pressure gas main.

HIGHLIGHTS & OUTCOMES

Successfully maintained a safe and stable batter slope through complex fractured rock strata, while preserving the proposed aesthetic appearance of the uniform shotcrete design.

Constructed temporary side tracks to enable safe construction of tie-ins and
maintain traffic flows on the Dawson Highway.

Developed a blast design that enabled all hard rock to be drilled, blasted and excavated safely within 25 metres of a major high pressure gas main.

Performed work within an environmentally sensitive natural vegetation reserve.

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