Underground Infrastructure - May 2023 - 34

Rehab Technology
grout is pumped around them to hold
them in place.
" Those options are a little more onerous
because they disturb the environment, "
said Osborne. " To do that, we
have to excavate and have big equipment
to get them in, and we worry about damage
to the environment from concrete,
mixing and things like that. The less you
disturb the environment the better, and
we can go in the existing opening without
a lot of that going on. "
While Osborne referred to the surrounding
infrastructure environment,
the natural environment also had to be
taken into consideration. The culvert
has creek beds situated at both exits, and
Fisheries and Oceans Canada had concerns
around which products would be
used for the rehabilitation, according to
IMC Distributors.
" There is a lot of wildlife in the area, "
said Karli Logan, IMC president. " These
are ANSI/NSF 61 certified, where some
of the other systems aren't considered as
environmentally friendly as this particular
system is. "
The application team leader checks the coverage of the robotic application system mid-pass.
Alternatives
Since complete replacement of the culvert
would have significantly disrupted
pedestrian and road traffic, trenchless
techniques were selected to avoid the
need for extensive excavation.
" It's a major arterial roadway in York
Region, " Waldron said of King Road. " In
York Region there's a general policy that
we do not close roads for construction,
and a culvert job such as this would require
a lot longer period of work - having
to do it in two parts, as in getting the
one side of the road and then the other
side of the road. "
At the location of the culvert, King
Road has two lanes of vehicular traffic -
which includes an average daily amount
34 MAY 2023 | UndergroundInfrastructure.com
of 26,700 cars annually - with tapering
left turn lanes, sidewalks and guide rails
on both sides, Zhu said. The top of the
culvert is more than 10 feet below the
road surface.
Alternatives to the Nukote products
typically include cement mortar linings
of varying design thicknesses, or curedin-place
pipe lining.
" Those are pretty much, in this application,
the two types of things we
compete with traditionally, " Osborne
explained.
Other methods include pulled-inplace.
That involves rigid liners, designed
from plastic or rubber, and with
a certain engineered thickness, being
pulled-in-place in one piece and then
Because of that certification, these
products are acceptable for use in potable
water lines. Fisheries and Oceans
Canada was concerned about damage
to aquatic life upstream or downstream
of the work site, Osborne stressed, and
the project profile notes the organization
reviewed and approved the Nukote
products.
Feasible alternatives evaluated for
this project included sliplining a corrugated
steel pipe liner or a high-density
polyethylene liner, but both would have
required installing an overflow pipe via
microtunneling to meet the Ministry of
Transportation of Ontario's highway
drainage design criteria.
" The spray liner solution at King Road
was the most cost-effective alternative
and had a shorter duration of construction
than other evaluated solutions, " said
Shu Zhu, senior project manager for York
Region-Capital Planning and Delivery.
Application
The onsite work took roughly a month

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