Client: City of Greater Sudbury
Location: Sudbury, Ontario
Size: 450 mm corrugated steel pipe approximately 55 m long

JLR was retained by the City of Sudbury to provide consulting services for the rehabilitation or replacement of an existing 450 mm corrugated steel pipe approximately 55 m long. The upstream end of the pipe is located at a catch basin along Edgewater Road while the downstream end outlets to Long Lake. The area between these points is steeply sloped, with several retaining walls and a gas main, posing significant constraints for any excavation activities.

The existing CSP pipe had a slope ranging from approximately 28% to 32%, and the bottom of the pipe was deteriorated. Due to this failure, a portion of the ground had collapsed near a retaining wall, where interlock bricks are located. JLR conducted a site visit with the City to explore repair or replacement options. Several preliminary options had been proposed including a combination of slip-lining a section of the pipe and replacing the rest, along with installing a maintenance hole to reduce the pipe’s slope. However, the challenge was to excavate and install a pipe given the constraints.

After brainstorming and considering the constraints, JLR suggested using the fold and form lining technique for the entire pipe. This method did not require any excavation or disturbances to the existing retaining walls, gas main, or trees. However, it posed a challenge at the downstream end due to the proximity to the lake. The contractor had to use a floating dock to bring the winch onsite for pulling the liner. The dock was launched from Moxam’s Landing, a public boat launch about 13 km from the project site. With a 9.9 hp motor, reaching the project site on the floating dock took approximately one hour and a half.

JLR performed hydraulic checks for post-lining to ensure the increased flow velocity did not introduce any adverse effects at the outlet.

EcoPipe Folded PVC Liner, meeting ASTM1504 standards, was used. The liner was steamed onsite at around 200°F to make it pliable and slip through the existing pipe. Once in place, the liner was plugged at both ends and inflated/expanded with pressure of 4-6 psi and at a desired temperature of 205-210°F. After desired expansion, the pipe was allowed to cool down to a target temperature of 90°F before releasing the pressure. Once cooled, the liner was cut out at both ends and CCTV was performed for quality assurance. This liner has an expected service life of at least 50 years

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