PROJECT SPOTLIGHT
MIG0332B
innovation in
geotechnical
instrumentation
“The mobility is really at the heart of the whole project,”
Marcoux said. “The schedule was developed around the
mobility plan and the maintenance of traffic. One of the
first things we looked at was how we were going to maintain
Monitoring Instruments
for Piling Projects & Deep Foundations
RST Instruments Ltd. is a world leader in the
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deep foundations. Since 1977, our customers
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The RST Instruments Ltd.
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The Permeation Grout Monitor System is a
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operators and engineers a “near-real-time” display
and recording of key grouting parameters to
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CANADA & USA: SALES + SERVICE + MANUFACTURING | 604 540 1100 | sales@rstinstruments.com | TOLL FREE: 1-800-665-5599
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RST Instruments Ltd., 11545 Kingston St., Maple Ridge, BC Canada V2X 0Z5
traffic through the Interchange. The project is divided into
five main traffic phases. The whole philosophy for us is that
we need to build new or temporary structures, then switch
traffic and demolish existing ones.”
Needless to say, the drilling demands of the project are
significant, with a total of 375 10- to 20-metre shafts to be
drilled, ranging in diameter from four to eight feet. Rebar
density varies between 200 and 250 kg/m3. There have been
notable successes. In 2017 alone, 110 shafts were driven, of
which 80 were completed within the first six months.
Petrifond Foundations is the main subcontractor. To drill
the shafts with a diameter of four feet or larger, they are
employing a variety of cranes: LS-218H, LS-128, LS-308 and
LS-108B, as well as the Casagrande B300 piling rig. In addi-tion,
they are using the ICE Model 44B vibratory pile driver
and APE 250 high-frequency vibratory pile driver, with ream-ers
and chisels for the rock and clamshell excavators to
remove spoil.
Ramsol Construction is also working on the site, using the
Casagrande B360XP hydraulic piling rig for 406mm-diameter
micropiles and the Casagrande C9 crawler drill with a down-the-
hole hammer.
“We’re driving a lot of rolled steel caissons under existing
structures because we want to build before we demolish,”
said Marcoux. Sealing difficulties caused by fine sand and silt
infiltration were solved by ensuring the caissons were sealed
properly into the bedrock.
Also, “it’s important to maintain the water pressure in the
shaft to keep the sand out,” he said. “The water level should
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