Lined Reinforced Concrete Pipe Addresses Challenging Site Conditions

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Located in the West End of the National Capital Region (Ottawa), the North Kanata Trunk Sewer Phase 2 project consisted of the installation of a new trunk sewer. This project required the new sanitary trunk sewer to cross various jurisdictions including NCC Greenbelt, intersecting several major arterial roadways as well as a major railway line. The overall length of the trunk sewer was over 2 km. Additionally, the location of the new trunk sewer was also challenged with the potential of type 4 soils. This includes sensitive clays, granite bedrock and varying water table characteristics. The Environmental Site Assessment was conducted by Houle Chevrier Engineering for CH2M Hill, the focus was to assess the soil and groundwater chemical conditions at various borehole locations.

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The City of Ottawa selected to use PERFECT Pipe, manufactured by Con Cast Pipe, for this project.
PERFECT Pipe’s joint profile and coupler connection was a key characteristic that influenced the selection. PERFECT Pipe’s joint profile and coupler connection eliminates the requirement for man entry into the pipe to seal the joints with a cap strip. This results in reduced construction time and improves the quality of the sewer system. The advantage of PERFECT Pipe is that it mitigates any infiltration of contaminated ground-water that would exceed the Ministry of Environment Standard as well as the City of Ottawa’s discharge criteria by preventing infiltration. Majority of the project utilized a 1200 mm diameter PERFECT Pipe.

Con Cast Pipe also supplied standard 1350 mm diameter and 1800 mm diameter reinforced concrete pipe (RCP) with an Agru Sure-Grip liner (HDPE) that was cast into the RCP during the manufacturing process. The HDPE liner does require that the joint gaps be welded with an HDPE cap strip. Once installed, the pipe would also require additional labour to complete the welding of the joints. This is a typical requirement of reinforced concrete pipe, lined with HDPE. Con Cast Pipe also provided some logistical expertise to address a very limited staging area for this project.

Custom-designed shipping cradles were utilized in order to maximize delivery of the pipe per load to the job site. This allowed for minimal inventory to be kept on-site while ensuring that installation would not be delayed due to lack of inventory.

Both Bray Construction and Jacobs would like to thank Con Cast Pipe for their contributions to this project and for providing innovative solutions that addressed the challenges encountered on the North Kanata Trunk Sewer Phase 2 project.

Nick Bray, P.Eng.
Operations Manager, Sewer & Water
Louis Bray Construction

Marc Maisonneuve, EIT
Civil Engineer in Training
Jacobs Engineering Group

Precast Producer: CON CAST PIPE