international
construction
january-february 2014
DRILLING
58
Unconventional drilling
hammer, the pressure is also reduced to ambient pressure as it is
an open system.
Christina Salmonson, area manager at Bilfinger Spezialtiefbau,
said, “With the Wassara drills, there is no sediment and dust
thrown into the air compared to the air-powered drills, and
instead the cuttings are flushed out in the water, which we pump
away for treatment. But we are working in clay so it gets messy – it
is always wet and now we are down to sea level.”
That is where the Grindex dewatering pumps come in. “We
are currently handling about two million litres of water a week,”
In the horizontal
directional drilling
(HDD) field,
Vermeer has
introduced a new
addition to its
Navigator family
– the D220x300
Navigator HDD
Ms Salmonson said. “The project will require around 2,000 holes
to be drilled for pile driving operations. We are always measuring
the ground water level, and the Grindex dewatering pumps are
working hard to remove excess water.”
When the works are complete, the new tunnel and the existing
main line track will be fully covered. Construction of this section
started in January 2010 and is scheduled for completion in 2014.
There is more technology on drilling equipment than ever before,
targeting a variety of challenges faced by contractors. With more
and more focus on protecting the environment – particularly in
urban areas – from emissions, dust and noise, it will be interesting
to see how manufacturers integrate new technology that tackles
these issues in the coming year.
iC
Bauer Maschinen subsidiary, Klemm Bohrtechnik, celebrated
its 50th anniversary in the autumn of 2013. The company is a
Bauer centre of excellence for the development, manufacture
and sale of anchor drilling rigs, engines and accessories.
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