completes the underpinning of the existing subway station.
A panel excavation sequence will then be carried out to
allow for the installation of a shotcrete wall with soil nails
to provide excavation support directly below the existing
subway station.
Shotcrete installation will advance for successive excavation
lifts until there is sufficient headroom available for
a low headroom jet grout drill rig. Vertical and inclined jet
grout columns will be installed to provide a continuous
water cut-off wall, connecting the secant walls on both the
east and west sides of the existing subway which were previously
installed during the surface work.
“The jet grout is being installed to ensure adequate water
cut-off and the shotcrete is to provide lateral support of the
soil,” said Morrisroe. The team will be using one of Keller’s
propriety drill rigs, the KB0, as the low-headroom jet grout
drilling rig.
Although the project is complex and logistically challenging,
Keller has maintained an exemplary safety record.
The client has given Keller the highest safety audit score
out of all contractors on the Crosstown line project, including
two scores of 98 per cent. The team received a letter of
recognition and a prize from CTS, praising Keller’s “outstanding
job” and thanking everyone for their commitment
to the company’s Life Saving Rules initiative.
The safety scores show that when it comes to complicated,
high-profile projects, Keller has the expertise,
flexibility and breadth of techniques to get the job
done safely.
COVER FEATURE
By the Numbers*
• The Eglinton Crosstown LRT will open as Line 5
Eglinton in 2021.
• It will have up to 25 stations and stops and link
passengers to 54 bus routes, three subway stations
and various GO transit lines.
• The line will get passengers to their destinations 60
per cent quicker than the existing subway, bus and
street car because the LRT travels at a faster speed.
• The projected ridership is 5,500 passengers per hour
in the peak direction by 2031.
• The capacity of the LRT line will be 15,000
passengers per hour per direction.
*Source: www.thecrosstown.ca
PILING CANADA 31
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