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Dustboss valuable
at mall demolition
In the US one of the Washington, D.C. area’s most
experienced demolition contractors has successfully
controlled extensive dust while taking down the old
Waterside Mall, a 4-storey, heavily reinforced concrete
structure totalling approximately 111,500m 3 . Crews
were able to suppress surface dust and airborne
particles with portable high performance misting
equipment, despite the crowded urban location
and close proximity to the local Metro station tunnel
entrance in what has been called a surgical demolition
project.
Engineers from Wrecking Corporation of America
knew that the densely populated area and close proximity
to remaining structures would require extraordinary
precautions. “The Metro station entrance has a
Buy well, crush
well, Downwell
A UK based demolition contractor has reaffirmed
its faith in Extec with the purchase of a new C-10+
track-mounted mobile crusher. Replacing an existing
C-10, the unit joins an Extec C-12, itself a replacement
for an earlier model, in the growing fleet of
Downwell Demolition.
The C-10+ was purchased to allow the company
to work efficiently on inner city sites, particularly
in and around London, where space is at a premium.
“I must admit I was nervous about taking on another
crusher in the present economic climate, but we are
lucky enough to have a combination of a very loyal
client base and a good business reputation, which
has enabled Downwell to continually expand. We
have plenty of work and projects on the books for
2009, and I am in no doubt that the Extec crushers
will play a big part in that continued success,” says
Downwell Demolition founder Matt Phillips.
The C-10+ was commissioned on site at the
Quantum House redevelopment in Croydon, Surrey,
a four-month contract to demolish and recycle a
seven storey office block. The C-10+ was then
sent to Kingsnorth Power Station in Kent where it
processed a mixture of concrete and slag on a seven
week contract. “Almost without exception, demolition
waste is now processed on site and left for future
46 PDi • Is s u e 1 - 2009 • Fe b - Ma r c h
way of creating a vacuum,” says Wrecking Corporation
of America executive vice president Terry Anderson.
“If the wind is blowing the wrong way, the dust gets
sucked right down. The site was also hemmed in on
three sides by structures that needed to be preserved,
so we had to do a very selective removal, while protecting
the entire surrounding area from the nuisance
and potential hazard of airborne dust.”
After researching possible solutions, Anderson
decided to rent a DustBoss DB-60. As the largest of
the suppression designs from Dust Control Technology,
the unit atomizes water droplets to the optimum
size for particle capture, launching them 60m or
more with a powerful 25 HP fan that generates nearly
850m 3 /min. With its built-in oscillation, the DB-60
Atlas Copco renovation in Mumbai
An Atlas Copco CC 2500 U was involved in the
renovation of the Wankhede Cricket Stadium in
development,” says Matt Phillips. “The two Extec
machines enable us to process all construction and
demolition waste into Type 1 or 6F2 very efficiently,
which makes them not only environmentally friendly
but also extremely cost effective.”
www.extec.eu
can effectively cover nearly 2,000m 2 with a fine,
dust-trapping mist.
The DB-60 is a fully automatic ducted fan
mounted on a wheeled carriage so it can be easily
located to accommodate wind direction or specific
work areas. The unit delivers adjustable elevation
from 0-50° and a 40° oscillation range, providing
crews with outstanding coverage.
“The droplet size is critical to effective suppression,”
says Dust Control Technology chief executive
Mumbai, India. The stadium needs to be renovated
for the 2011 Cricket World Cup finals.
Shri Ganesh Construction, a subcontractor
of Supreme Infrastructure India Pvt Ltd, Mumbai,
was carrying out the necessary demolition
works. The Mumbai Cricket Association decided
to demolish most of the northern and western
stands of the stadium and improve the drainage
of the ground. The capacity of the stadium will
be increased from 35,000 to 39,000 seats and
the entrance will be enlarged to make access
and departure of spectators safe and easy. The
main aim is to give every spectator a clear view
of the match apart from comfort and world class
facilities. Any corner of the stadium will have free
view of the ball crossing the boundary line.
Wankhede Stadium was built in 1975 and is
surrounded by residential buildings and skyscrapers
and the Mumbai western railway track passes
close to the stadium. Due to noise and vibration
levels the use of hydraulic breakers was prohibited.
The authorities instead accepted the use of
a CombiCutter for the demolition work.
officer Edwin Peterson. “Dust particles tend to be
in a fairly narrow size range, so the water should be
atomized to droplets near that same size for maximum
attraction. Our standard models produce droplets
from 50-200 microns, but all of our units are designed
to be easily customized for targeting specific particle
sizes or for cooling applications.”
The takedown
WCA began the project in November of 2007, and
the old structure did not go easily. “This was one of
the more difficult buildings we’ve taken down in some
time,” says Anderson. “We had to fight down every
step.” WCA employed a high-reach excavator for
the general demolition work, a 45t Komatsu PC400
with a 26m boom. Kinshofer dedicated shears with
360º rotation were used for cutting the approximate
5,000t of reinforcing.
Anderson’s crews also made extensive use of a
90t truck crane and wrecking ball. “It’s a technology
that virtually never breaks down,” he said. “And it
leaves a small carbon footprint.” WCA also used a 63t
Caterpillar 365 excavator to take down the structures,
along with three Hitachi 450 excavators with bucket
attachments and four Hitachi 330 excavators with a
variety of attachments that included concrete pulverisers
and demolition hammers.
WCA performed all concrete crushing and
recycling on-site, with an Extec C10 crusher used
to process approximately 53,500m 3 of material.
The crushed product was used for non-structural
fill and backfilling.
“By nature, concrete work generates a lot of
dust,” says Anderson. “We felt we had to take
strong measures for control on this project. The
DustBoss did such a good job that we decided to
purchase the unit.”
www.dustboss.com
About 7,000m 3 of reinforced concrete had
to be demolished within a project time of three
months. “I completed the job on time and am very
satisfied with the performance of the CombiCutter
CC 2500 U. I am happy with sales and service
support given by Atlas Copco,” says Shri Ganesh
Construction owner Phoolchand Jaiswal.
The CC 2500 was equipped with universal
jaws, which are fitted with teeth for breaking concrete
and with blades for steel cutting. All blades
and teeth are replaceable. It fits on carriers from
22-35t and weighs 2,640 kg. With maximum
oil flow of 250 l/min the cutter achieves opening
cycles of 3 sec and closing cycles of 2.8 sec.
www.atlascopco.com