Home' Work Boat World : October 2015 Contents Pacific Marine Group, based in Townsville, Australia, has
almost completed demolition of two berths in the Port of
Townsville (Berths 6 and 7).
The berths were originally constructed in 1910, and have
progressively been upgraded over the years, until they reached the
end of their useful life and a decision to demolish was made.
The project involves removal and recycling of around 580 piles,
both steel and concrete, and up to 15,000 tonnes of concrete deck
and beams. The reinforced concrete is being crushed and separated
into steel and concrete. The concrete is then crushed and recycled
into roadbase and the steel rebar recycled.
PMG also has to dredge around 70,000m3 of seabed to -12 .7
metres lowest astronomical tide (LAT), which must be disposed of
on land. PMG believes there will be a much stronger demand for
this type of dredging in future after the recent government
regulation changes banning disposal at sea in Australia’s Great
Barrier Reef Marine Park of capital dredge spoil. The job also
involves decontamination and removal from site of an entire
shiploader and overhead conveyor structure.
As of August 2015, all of the wharf structure and shiploader had
been removed, the only works remaining being the dredging,
which is ongoing.
PMG's new marine facility in Townsville has been heavily
utilised to support the project. All barges have been set up at the
facility, all demolition materials have been u nloaded across the
in-house barge ramp, and all vessels and crew have been supported
by the management and maintenance crews at the facility. The
facility has 20,000m2 of waterfront hardstand, a 200-tonne crane
capacity wharf, barge ramp, as well as fully equipped workshops
able to deliver fabrication and fitting services, blast and paint,
electrical, com mercial diving services, as well as complete barge
loading and seafastening services.
Plant utilised for the berth demolition project includes the
crane barge ‘Sheerlegs’ fitted with a 70-tonne American pedestal
crane and 3.0m3 clam shell dredging bucket, tug ‘Sailfish’, barges
‘PMG121’ and ‘PMG181’, which have been fitted with spuds, and
barges ‘PMG120’, ‘PMG123’ and ‘PMG150’, which have been
fitted with hungry boards for rubble transport and dredge spoil
transport. Also involved are pushboats ‘Grunter1’ and
150- and 70-tonne crawler cranes, ICE415
Vibrohammer and a number of excavators running hydraulic
shears and rock breaking attachments.
Some new equipme nt has been designed and built in house,
including a number of rubble barges that fit between rows of
piles, and a pile tipping frame to increase safety and efficiency
associated with getting extracted piles from a vertical to horizontal
position for loading onto barges for removal off site.
The job is due for completion in early 2016.
Early progress on a berth dismantling
Removal of the piles
PORT OF TOWNSVILLE
BERTHS 6 AND 7
MARINE PROJECTS WORLD
48 October 2015 WORK BOAT WORLD
48 MP TOWNSVILLE:Layout 1 14/9/15 1:50 PM Page 48
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