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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20 T R E N C H L E S S T EC H N O LO GY C A N A DA FA L L 2018 I N R EC E N T Y E A RS, public agencies have become increas- ingly strategic about their approach to managing infrastructure – largely due to the realities of aging assets and tightening budgets. Infrastructure as- set management with an eye toward systematic rehabilitation and replace- ment is now the norm, and new and creative financing schemes are helping to ease the burden on rate-payers. The Region of Peel in Ontario, which provides drinking water and wastewa- ter services to approximately 1.4 mil - lion residents in Brampton, Caledon and Mississauga in the Greater Toronto Area, has taken an additional step. In an effort to optimize the performance of the wastewater collection system, maximize its useful life, and minimize life-cycle costs, the Region of Peel re- cently developed a new set of stan- dards for the design, construction, and rehabilitation of its sanitary sewers. The standards address four key areas: - Pipe material - Waterproofing and corrosion protection - Testing of the constructed pipe, and - Human access considerations One of the first projects to implement the new standards was the Twinning of the East Brampton Trunk Sewer. The new sewer was built with materials that would assure longevity of the built asset, and was internal pressure tested with water post construction to assure that it was leak-free. A leak-free sewer reduces treatment costs by eliminating extrane- ous water entering the sewer systems. Twinning of the East Brampton Trunk Sewer The Region of Peel Water and Waste- water Master Plan recognized the need to twin the existing trunk sewer due to capacity deficiency servicing exist- ing and future needs of Caledon and Brampton. The Region retained Associ- ated Engineering to provide engineering services for the preliminary and detailed design of the trunk sewer twinning. The resulting project to build a new parallel sewer included approximately 5.2 km of 1,500-, 1,650- and 1,800-mm ID sewer from near the intersection of Queen Street and Goreway Drive to south of the intersection of Highway 407 East and Steeles Avenue East. Construction of the twin sewer com- prised approximately 2.0 km of 1,800- mm ID pipe, 2.87 km of 1,500-mm ID pipe and 260 m of 1,650-ID pipe, in- stalled in 14 drives ranging from 95 m (312 ft) to 820 m (2,680 ft) in length. Of the 14 drives, five included some curved components, some with mul - tiple curves. Ward and Burke Microtunnelling Ltd., of Mississauga, Ontario, was se- lected as the microtunnelling contrac- tor for the $40 million project . Con- struction started in May 2017 with all tunnelling completed in April 2018. All internal pressure testing of the new sewers has been completed. "The Region of Peel had trialed pres- sure testing on a smaller project but this was the first time it had been done on a large- scale project and large diameter pipes. We had to ensure the gravity sew- er pipeline could withstand 50 psi inter- nal pressure after the tunnel process, so we worked with the pipe manufacturer, Decast, to test the pipe at their factory before we used it in the field," said Ward & Burke Director John Grennan. "All the lines were successfully tested signed off, and the client is happy." Part of the Region of Peel's new standard called for pipe to conform to AWWA C302 standards. It had been Ward & Burke's previous experience in working with the conventional Carnegie joint that the joint tended to separate as a result of microtunnelling activities, allowing dirt to enter into the joint gap and potentially affecting performance of the pipeline during pressure testing. To combat this, Ward & Burke worked with Decast to develop a new hybrid joint design that met the project re- quirements. Other than modifying the joint, the jacking pipe was built to spec- ifications commonly used on previous Ward & Burke microtunnelling projects. Corrosion resistance was achieved using a sulfate-resistant cement in the concrete pipe, although one section of the new sewer called for an HDPE lin- er cast into the pipe in an area where U N D E R P R E S S U R E By Jim Rush Ward & Burke Passes Test for East Brampton Sewer Project

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