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Flagstaff Road Landslip

Client: Banana Shire Council

Infrastructure

Roads

Contract

Construct Only

Location

Isla Gorge National Park, QLD

Value

$1.3 million

Timing

November 2014 – March 2015

Overview

Following failure of previous wall repairs, CMC was contracted to cut further into the hill and implement an alternative solution to the faulty gabion basket repairs. CMC’s solution moved the road 15 metres laterally to within a major escarpment, deviating the existing roadway through a 200-metre portion onto new pavement, before reconnecting it with the existing road.

Construction of this new solution involved the construction of new concrete lined drains and channels, upgrading exiting road furniture, unbound and bound pavements and bituminous spray sealing. The project also involved utilising spoil from the excavation of a gully along the road to raise the existing roadway by four metres to reduce the removal and transportation of spoil offsite.

Highlights

Sustainable Impact: CMC worked to create a more natural drainage structure by altering the original scope from shotcrete lined catch drains over the escarpment to rock lined channels, chutes, and berms flowing into existing structures. This helped to preserve the delicate Isla Gorge National Park area in which the project was undertaken.

Collaboration: Effective collaboration between CMC and Queensland Parks and Wildlife Services identified acceptable native species for revegetation efforts.

Economic: The projected was completed two weeks ahead of schedule.

Safety: CMC identified that the rock stratum within the excavation site was highly variable in nature, therefore blasting as an excavation method would have created an unnecessary risk to site safety.

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