January/February 2023 - 72

allowing Eglinton Avenue to be
reopened earlier than planned. The
overall performance of the support of
excavation and TBM bridge during the
TBM lift was excellent, with negligible
movement detected during real time
monitoring of the shaft walls during
lifting and lowering of the TBMs, and
negligible settlement of the bridge
foundations after TBM traverse.
Main Station Excavation
The TBM and its carrier crossing Eglinton Avenue
The existing subway box, located in
the middle of the proposed traverse,
was constructed in the 1970s and
showed signs of corrosion and concrete
spalling in the section under Eglinton
Avenue. The existing subway structure
was also designed under an earlier
design code and as a result did not have
the spare capacity to support the
additional load from the TBM carrier. To
solve this concern, a temporary bridge
Station connection with twin light rail tunnels
was constructed to allow the TBM to
cross over the subway line, supported
on micropile foundations on either side
of the existing subway structure. This
allowed the TBM carrier to traverse
Eglinton Avenue without putting
additional stress on the existing
structure. The entire lift operation took
place overnight outside of the existing
subway operating hours, over just two
nights. It finished ahead of schedule,
In July 2015, the Eglinton LRT Station
contract was awarded to Crosslinx
Transit Solutions (EllisDon, Aecon, ACD
Dragados Infrastructure Canada and
SNC Lavalin). Construction of Cedarvale
Station required support of excavation
between the exit and launch shafts for
the three new station entrances, station
platform, concourses and air shafts, all
with varying and sometimes sloping
excavation depths ranging from 5-20 m
(16-65 ft) depth. To meet the staging
needs, various design and construction
strategies were employed including
temporary staging walls, buried tension
struts between adjacent excavations,
partial top-down construction to
support live traffic and other methods of
support around the 28 internal corners
were utilized. Support of excavation and
traffic deck installation for the main
72 * DEEP FOUNDATIONS * JAN/FEB 2023

January/February 2023

Table of Contents for the Digital Edition of January/February 2023

TOC
January/February 2023 - Intro
January/February 2023 - 1
January/February 2023 - 2
January/February 2023 - TOC
January/February 2023 - 4
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