Trenchless Technology

Fall Canada 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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W W W.T R E N C H L E S S T EC H N O LO GY.C O M/C A N A DA 19 The final pullback along Niagara Street was extremely narrow, requir- ing extensive analysis including street level lidar scanning and 3-D modelling to determine the impact to residents, powerlines and existing infrastructure with the final design requiring both horizontal and verti- cal radius. Challenges from the Start The CRD is on Vancouver Island and, as such, all equipment was brought over on ferries and barges, which created significant logistics issues throughout the project , par- ticularly with the heavier pieces. The HDD portion of the project was completed in one and a half months avoiding the primary tourist season and obvious disruptions to the com- munity that finishing mid- summer would have in this tourist area. James Bay, where the 940-m long pipe was laid before pullback to McLoughlin Point , is a densely pop - ulated neighborhood in Victoria. It also has an active marina that in- cludes a cruise ship terminal where cruise ships port on route to Alaska and beyond. The neighborhood is well established and one of the oldest in the city, not designed for a large- scale pipeline construction project , especially over a scheduled 60-week duration. If residents and visitors to the popular tourist destination were unaware of the impressive con- struction project happening in their midst , it was due to extensive project planning by Michels and its partners. The team effort included the installation of sound wall protec- tion that was designed to look like natural vegetation , limited work- ing hours and strict adherence to the traffic management plan and working with the Anglers Club that shared the boat ramp and provided the only site access to the Ogden Point HDD site. Local sea lions and otters were often curious visitors to the site that went right to the high tide mark . Michels assembled the 78 sec- tions of 12-m long pipe down Ni- agara Street , turning the 6- to 8-m wide, house-lined urban street into a securely fenced construction zone occupied by a single point welding station with all the support and test- ing equipment required to assemble and manage the sections. The road was shut down for approximately one month in order to accommodate multiple sections for pipe makeup and preparation. In order to mini- mize impacts to the schools and lo - cal business cross streets remained open. Michels assembled the pipe into three separate sections and then on the last week welded the sections together and made one continuous section for pipe pull . A highlight of the project was how residents were engaged in the project when the pipe was strung down the street . A Victoria artist got permis- sion to paint an underwater scene on it . The colorful painting included an octopus, starfish, crab and fish, as well as a note of thanks to the resi- dents of St . James and Victoria who endured the inconvenience of the project shutting down several roads. The original plan was to have ex- ternally coated pipe, but the design and specifications were changed and the 42-in. pipe was internally coated. This allowed for the British Colum- bia artist to complete her work as well have a kids day where they could come out and put a hand painting on the pipe. Final pipe pullback required four sidebooms and six cranes to lift the massive section 1.35 million pound section on a compound curve into position for pullback. The pullback required three days with no work at night to minimize impacts on the resi- dents. The pipe reached the McLough- lin Point side on April 19, 2018. Story compiled by Trenchless Technology Canada staff with information from Michels Canada and the Capital Regional District. The undersea forcemain will convey wastewater from Oak Bay, and areas in Saanich and Victoria via the Clover Point Pump Station and the Clover Forcemain to the McLoughlin Point Wastewater Treatment Plant.

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