INDUSTRY NEWS
Liebherr’s rotary drilling rig, LB 44, on a site in Dornbirn, Austria LRB 355, the newest piling and drilling rig from Liebherr,
in operation for the construction company Hilti & Jehle
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At the outset, the continuous flight auger (CFA) method
was used. However, due to the extent of the excavations,
it was finally decided to change to full displacement tools
for the drilling work. No less than 2,988 piles must be
inserted at depths of 28m and 29m for the foundation work
in Dornbirn, which started in the middle of March 2016
and should be completed over the summer. The ground
conditions present a special challenge. Although the soil
comprises mainly loam and peat, the work is made more
difficult through several layers of densely compacted gravel,
which are up to six metres thick.
Also in operation for Hilti & Jehle is the new high performance
piling and drilling rig LRB 355, which has been sold
for the first time worldwide. The 105-tonne machine with a
maximum height of 33.5m made its debut last autumn on a
building site at the exhibition grounds in Dornbirn, Austria.
Despite its dimensions, the deep foundation machine is easy
to transport with mounted leader, slide and ropes.
Due to the difficult soil conditions, and in order to avoid
any subsidence, a large number of concrete piles in various
forms had to be inserted at the job site in Dornbirn. In the
process, the LRB 355 proved its strengths for the first time
under tough conditions. In the past, various types of machinery
would have been necessary, but this new, multifunctional
machine can create different types of piles, depending on the
requirements and soil conditions.
PILING CANADA 71
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