Ear to the Ground - Spring 2013 - (Page 17)
B Y L AW R E N C E A R C A N D, P. E N G , P R E S I D E N T, T 2 U T I L I T Y E N G I N E E R S I N C .
ECLRT AND SUE
Natural Transit Partners
ubway or LRT… While the battle
raged on between the various
layers of government about the
Eglinton Crosstown LRT (ECLRT) project one thing was clear—subsurface
utility engineering (SUE) mapping services were going to be a key aspect
towards the success of the project.
The ECLRT project is one of the
largest major infrastructure projects
in the province and around the country. It is designed to improve commuter
S P R I N G 13
transportation across an EW corridor
along Eglinton Avenue. The project
started as a TTC initiative and is now
being run as a Metrolinx project. The
current plan calls for combination
of both below grade tunnels and at
grade lines, along with numerous stations—see www.thecrosstown.ca for
From early stages of the project
the TTC/Metrolinx recognized that
although this was a major transportation project it was also an equally large
utility infrastructure project. Based on
the successes they achieved on other
projects, such as the TTC Union Station
2nd Platform expansion project, they
decided early on that a comprehensive SUE mapping investigation would
be completed during the preliminary
design stage of the project that would
assist with the overall design and
coordination of the project. ECLRT is
not the only major transit project using
SUE to help manage utility items. The
Ottawa LRT, Edmonton LRT, York VIVA
BRT, Durham Hwy 2 BRT are other
large profile transit projects gaining
success by using SUE.
for the Project
The first stage in the process was the
collection of records information from
all utilities within the project areas.
Requests were sent to all utility companies to provide records information,
including the City of Toronto. A special
trip was made to the City of Toronto
vault to review record drawings for the
area. All information was compiled and
used to provide with data for field staff.
The next stage was the actual collection of field data. There are a number of different mapping technologies
that can be used for mapping utilities.
Three of the more prominent techniques
were used for this project—electromagnetic pipe and cable locate equipment;
ground penetrating radar; and CCTV
cameras with sondes. The various technologies were used to mark out the horizontal location of utilities on the ground.
The marks were then surveyed and
based on the professional engineer’s
judgment of the field data and records
information the horizontal location was
placed onto the Microstation drawing.
Confined-space entry techniques
were used to gather invert and chamber dimension data at key locations.
There are several large diameter trunk
sewers running through the project
area that will act as a critical control
for the overall depth and location of
the new tunnels.
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Ear to the Ground - Spring 2013