GARDEN ISLAND LAND DEMOLITION AND WHARF DECK REMOVAL
Garden Island, NSW
Stage 1: Mar 19 – May 19; Stage 2: Aug 19 – Nov 19
The project involved a large, two stage removal of wharf infrastructure at the Garden Island naval base close to Potts Point, NSW. Major Projects Group partnered with Industrial Demolition Services (IDS) to provide machines, labour and expertise for this project.
The site was highly sensitive in nature, due to its proximity to an active naval base. Adding to the project’s complexity was the limited working space of the site and unpredictability of the surrounding marine environment.
SCOPE OF WORK
Stage one of the project saw the removal of a large two-story building from the site, the removal of the existing oil wharf and one third of the larger, cruiser wharf. Stage two of the project saw the remainder of the cruiser wharf removed.
Each wharf consisted of a steel reinforced concrete subbase and a second layer of concrete over the top. These layers needed to be removed independently in some cases because of heavy damaged due to corrosion.
Limited operating space;
Close proximity to unpredictable marine environment; and
Highly sensitive nature of the work site.
The project began with the strip out of the large two-story building on the site’s north side. Major Projects Group’s 33 tonne Liebherr LH-30 excavator was then used to tear down the structure and the materials were loaded onto trucks to be removed from site and recycled.
Work on the oil wharf then began with 2 x 2 meter sections being cut out of the wharf’s upper concrete layer. Holes were then drilled into each corner of the concrete sections and cables were used to sling them under an excavator. The concrete was then broken down and removed from site. The subbase layer was then removed in the same way. The two layers needed to be removed independently due to its poor structural condition.
The cruiser wharf demolition repeated the same process, but due to the better structural condition of the concrete slabs, an excavator bucket was able to lift both the upper layer and subbase together without the use of a sling. Excavators equipped with long reach booms were then able to remove the wooden wharf base.
Particular care needed to be taken throughout the entire process to make sure that no contaminated material was leaked into the sea. This was done by implementing strict material removal procedures, zoning off certain areas vulnerable to collapse and deploying floating barriers to catch any debris.
With the wharf demolished and material removed, the site was ready for the construction of the new wharf. Major Projects Group completed the project on time, with no major incidents or injuries.
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