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but it had been used for very few projects
of this magnitude and complexity.
To verify system performance and
allow for timely adjustments during
construction, Monir’s comprehensive
monitoring system consisted of three
borehole inclinometers, 60 precision
survey targets on the adjacent highrise
buildings and more than 400 survey
targets on every other individual soil nail.
The monitoring program resulted in
cost and time savings for the owner –
and peace of mind for a cutting-edge
support system.
For the RC Harris Water Treatment
Plant project in 2008 in Scarborough,
Ont., the contractor had to meet stringent
movement criteria across an expansion
joint between the building’s exterior
footing and the holding tank behind it,
Ford recalled, if the joint expanded too
much, water could be released from
the tank, which would be devastating.
“We proposed installing extensometers
inside the tank” across that
critical joint, Ford said.
Since the tank could only be
decommissioned for a short 48-hour
window to allow for the installation,
extensive planning and co-ordination
were essential. The monitoring program
was expanded to include extensometers
fixed to telescoping rods
and attached to the first row of columns
and the foundation wall. The
gauges were remotely monitored after
the tanks were re-commissioned,
sending an email alert to the appropriate
people if movements exceeded
the allowable limits.
“It gave the design team more
freedom in terms of the support
systems they were going to put in
place,” Ford said.
For Toronto’s Union Station
revitalization and expansion project,
which began in 2011 and is ongoing,
a second basement needed to be
added without changing the historical
structure’s outward appearance. To
accomplish this, the foundation
columns that support the viaduct
structure, which carries all train traffic
and more than 250,000 daily station
users, had to be cut and extended
below the existing foundation.
It was critical that this complicated
“dig-down” solution be monitored at
all times to safeguard the public, trains
and structures. Monir developed an
innovative system of monitoring that
included up to eight precisely located
automated total stations to ensure
that track movement was negligible
throughout the column cutting and
extension. Its specialized team of
technicians and surveyors monitored
target readings and correlated
the data to the jacking and loadtransferring
processes. This strict
real-time monitoring, which required
an exceptionally high tolerance of 0.3
millimetre accuracy, may be the most
extensive and innovative program of
its kind in Canada.
Detecting early instability
Public safety as well as worker safety
is always an important consideration
when selecting what type of monitoring
to use, Ford says, and it can also be a
project’s primary objective. In 2017, the
company was hired by Alterra Power
Corporation to monitor a rockslide
area in the B.C. interior, where its realtime
monitoring enabled crews to
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