Trenchless Technology

DEC 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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40 T R E N C H L E S S T EC H N O LO GY D EC E M B E R 2018 S T R U C T U R A L LY R E H A B I L I TAT I N G its first watermain with cured-in-place lining (CIPP) in 2002, the City of Toronto has invested in the technology each year since. The City has grown the program to become the largest CIPP lining program in North America, rehabilitating more than 25 miles (40 km) a year. Historically the City has focussed the program on projects that lay in residential, commercial or industrial areas in the City. One instance of this less traditional location was the rehabilitation of a watermain that had failed under the Mimico Creek in Etobicoke. The watermain in need of repair was a 12-in. (300- mm) cast iron watermain that had failed due to a longitudinal crack. This watermain was critical to the surrounding distribution network as it was one of a few to feed the southwest portion of the City. The crack itself had formed in a section located in a bank beside the creek. When the main failed it washed out the surrounding soil and gabion baskets, exposing the watermain to the elements. Due to the severity of the break and location an emergency repair was difficult. Instead the watermain was isolated and shutdown until it could be fully rehabilitated. Due to the limited access, difficult site conditions and severity of the break the City, along with its consulting engineer WSP, decided that the best solution was to structurally rehabilitate the pipe with CIPP lining. The project was designated as an emergency repair and contracted out to Fer- Pal Construction Ltd. to be completed in July and August of 2018. Aqua-Pipe was selected as the product to be installed. Before construction could occur, an environmental assessment was required as the area was deemed environmentally sensitive. While BY GEOFF BRITNELL Investing in CIPP Fer-Pal Uses Internal Repair, Aqua-Pipe CIPP Liner to Rehabilitate Critical Watermain in An Environmentally Sensitive Area The watermain in need of repair was a 12-in. (300-mm) cast iron watermain that had failed due to a longitudinal crack. This watermain was critical to the surrounding distribution network as it was one of a few to feed the southwest portion of the City.

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