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19 09/13

Road Remediation work resumes at the Eastern Dorrigo Way

After a week”s time off to give way to the rally race that finished on Sunday, Specialised Geo is now back to work at the Eastern Dorrigo Way to fix two more landslip sites in the area. The road remediation work on a 1.2 km site on the downhill side of the Eastern Dorrigo Way was awarded to the team in 2012 by the Coffs Harbour City Council in consultation with the Regional Geotechnical Services.

The project aims to use slope stabilisation techniques to counter the effects of erosion in sections of roads in 6 major sites within the area ,and to decrease if not to alleviate, disruption to local traffic.

Of the four sites that have been completed, Specialised Geo considered the works on Site 3 as challenging but manageable. With the team”s expertise, cantilevered retaining wall and various technical processes were utilised to complete the works in this site, including a footing and 3 lifts, of note just under 650 tonne of backfill aggregate.

DTH and TOP hammer drilling practices and methodical approach were applied by the Specialised Geo team in Sites 1, 2 and 3. In Site 3, the team used self sacrificing drill bits and self grouting, serious drill. Grout meters were also obtained. Down-the-hole drilling was a steady process and anchors were manually installed and grouted. For this work, the team used 32 and 38mm anchors, hollow steel and glass fibre anchors, Une fois que la roulette est place filature, la petite balle est lancee a partir de la direction de la roue. negating the use of Tremmie or grout lines secured to the bar. An adaptor that was made up in the Specialised Geo work shop was used to insert the grout. Kwik spacers were used on the bar.

Specialised Geo”s past experiences were well-utilised in Site 2 as well, where it used a pre-made grout mix from Holcim and had to impress upon them a pristine bowl. The method used was very efficient, very quick and cost-effective, and a standard practice considering the remoteness of the area.

The work, although very physical and demanding in nature, is considered by the Specialised Geo team as the least demanding of all its works

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because it goes into building good working and consulting relationship with the Coffs Harbour City Council, the Regional Geo Consultancy, Traffic management and the Mid Coast Traffic Services, which provided the plans for all excavation and extreme single lane situations.

Specialised Geo team is aiming to complete the works on two more sites in 1 to 2 months.

Take a peek into some of the images of the Specialised Geo team in action…

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