MIG0332A
Cyntech’s end grew to the point where they added a company
to their work.
“Before site work commenced, the scope was increased
to include the supply and installation of driven piles where
appropriate. To execute the driven pile work, Cyntech teamed
up with Keller Foundations,” said Hindbo. “Later, we added a
third option – a composite, cast-in-place pipe pile design; for
these, Cyntech fabricated the central shafts – large-diameter
steel pipe sections – and Keller completed the field installations,
including the drilling, the placement of concrete and
the setting of the prefabricated central shaft. The pile cut-off
and capping works for all piling types were completed by
Cyntech.”
In the end, Cyntech and Keller had clearly put in a massive
effort.
“The final count of completed structures in our scope was
115, founded on 1,209 helical, 272 driven steel pipe and 84
cast-in-place pipe piles,” said Hindbo.
Challenges
Once the project got moving, Cyntech encountered some
difficulties. According to Hindbo, soil conditions had a high
degree of variability. This included highly weathered bedrock
showing up at different depths, and even the occasional “bottomless”
“Also, due to the late route realignment, the geotechnical
information on which we initially designed piles and planned
our work was based on boreholes discovered to be kilometers
away from the actual structure locations,” said Hindbo. “This
meant a subcontract with Golder to perform geotechnical
innovation in
geotechnical
instrumentation
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investigations, and because of the tight schedule, we were
often installing foundations at structures only days after
the boreholes were drilled. We had a handful of different
pre-engineered piling solutions to work with the various subsurface
conditions – this was the only way we could keep the
crews moving so closely on the heels of Golder.”
Further issues arose surrounding climate, as can be
expected while working through a Canadian winter.
“Although difficult to measure the exact impact, delays
were caused by the snowy winter,” said Hindbo. “For the Red
Deer area, December 2013 and January 2014 hold the records
for having the most snow on the ground since they started
keeping records in 1939. Removing new and drifted snow tied
up significant resources, which impacted the productivity of
all crews in the field.”
The challenges pressed Cyntech and its partners, as there
was a time constraint on the project.
“Running late with the construction schedule was not an
option as, due to environmental concerns, most locations
were only accessible with frozen-ground conditions,” said
Hindbo.
Despite these obstacles and plan alterations, Cyntech
and Keller were able to progress on schedule. In total,
Cyntech had five helical pile crews, each with an excavatormounted
hydraulic drive unit and ancillary equipment. The
output torque capabilities ranged from 150,000 to 300,000
ft-lbs. Keller, meanwhile, contributed two crews using
Liebherr LRH 100 pile driving rigs ( for the driven pipe piles)
and two more with Watson 3100 drill rigs for the cast-inplace
pipe piles.
PROJECT SPOTLIGHT
CONTINUED ON PAGE 41
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