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Pettigrew Hill stabilization

In September 2003, a landslip occurred at Pettigrew Hill, in Ipswich, Queensland — the site of a prominent water supply reservoir. Following this event, Ipswich Water called for expressions of interest for a design / construct contract to provide remediation and stabilization of the area, with the criteria to control, and reduce the potential for, any future slippage.

Concrib was subsequently engaged to design and construct a retaining wall system that addressed the engineering criteria. The solution offered was a three-tiered concrete crib wall system, with a total elevation rise of 12 metres, over a setback of 24 metres. The lower wall of 3.75 metres featured a curved face to match the local roadway. The mid wall was 1.75 metres in height, with the upper wall 3.73 metres in height. Total face area of the three walls was 295 square metres.

The walls were completed within time and budgetary constraints. Special consideration was given to drainage requirements in the reinstated fill, and this was achieved with the free draining nature of the Concrib concrete crib wall system.

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Pettigrew Hill stabilization
Pettigrew Hill stabilization
Pettigrew Hill stabilization
Pettigrew Hill stabilization

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