MAYFIELD BERTH NO. 5 REFURBISHMENT
Dec 08 – Apr 09
Major Projects Group (CMA Corp) was contracted to BMD Group to undertake the demolition and removal of the main wharf, hardstand and western wharf from the former BHP site in Mayfield, NSW. The western wharf is a reinforced concrete structure which spans approximately 80m of the Hunter river. It is suspended over the water with steel and concrete piles.
SCOPE OF WORK
The scope included the demolition and removal of the dolphins and associated structures, the loading, transport and disposal of all concrete, timber, steel and rubbish, and the provision of environmental controls, such as a 400m floating turbidity boom.
Working over and around water;
Complex project requiring the coordination of barges, cutters, excavators and cranes to work in sync; and
Heavy crane lifts.
The demolition of the dolphins and associated structures was under– taken by a 300t Crane situated on the existing hard stand with the assistance of two work boats. The concrete segments were removed methodically, slung in a pre-calculated position to ensure secure lifting.
In addition, a 35t excavator and concrete cutting equipment were used to remove the concrete slabs, walkways, pipework and cable trays. Piles were cut at the soffit of the pile caps. The crane rail beams on the main wharf were hammered using two excavators.
Specialist concrete cutters core drilled the main wharf to enable lifting of the wharf deck off the piles. The suspended slab was rigged to the 300t Crawler Crane via slings through pre-drilled core holes. Cutters road sawed into suspended slab section for lifting by the 300t Crane.
The large rubber fenders were removed and recycled locally. Detailed demolition methods were used to ensure accurate site preparation to enable the new wharf construction.
A team averaging 12 employees, working with concrete cutters, crane drivers and a coxswain, have reclaimed in excess of 138 tonnes of steel and reinforcing. All 4000 tonnes of hammered concrete was compacted by BMD for use on site.
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