Trenchless Technology

DEC 2018

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32 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 AS ONE OF CANADA'S O L D E S T C I T I E S, Montreal is looking to get an under- ground upgrade. In 2018 alone, the City of Montreal set aside CAD $1.1 billion to repair and update aging roads, water mains and sewers. The need for new utility infrastruc- ture is borne out by the numbers: The average age of water mains in Montre- al is 61 years — at least 20 years older than in other large Canadian cities. An average of 19 breaks occur for ev- ery 100 km of watermains in the city. Montreal has responded by stepping up replacements and new construc- tion: In 2006, only 16 km of water mains were replaced annually, but by 2016 this had increased to 389 km. Sewer systems are similarly over- taxed and aging rapidly. In total about CAD $348 million is being de- voted to upgrading antiquated water and sewer systems, with a further $210 million earmarked for specific projects. Small Diameter Tunneling Ramps Up The influx of Canadian dollars is re- sulting in new utility tunnel construc- tion across the city. Some of these proj- ects will be utilizing new technology for the area, as well. For example, Con- tract A-335-4 involves the installation of a new 750-mm diameter wastewater line that will require the first-ever pipe jacking tunnel in rock below the city. The new line will require a 415-m long crossing from a valve chamber at Haut-Anjou Boulevard under High- ways 40 and 25 to a valve chamber at Louis-H. La Fontaine Boulevard. Located between 6 to 8 m below the surface, the tunnel runs through lime- stone with possible hard intrusions, ranging in rock strength from 50 to 165 MPa UCS. Tunneling was to begin in August 2018 with local contractor Nella Drilling using a small diameter (1.67 m) hard rock boring machine manufactured by The Robbins Com- pany known as a Rockhead Gripper Shield. Larger projects have also been re- cently completed. In November 2015, a 3-m diameter Robbins Double Shield TBM completed the Rosemont tun- nel, a 4-km long tunnel through lime- stone bedrock. The water tunnel was designed to add a buffer into the city 's system as needed during peak seasons. The new line utilizes the modernized Rosemont Reservoir, a large structure for potable water built in 1962 but de- commissioned 20 years later. Tunneling at Rue Jarry Another recent new water line is the Rue Jarry Water Transmission tunnel . The City of Montreal commis- sioned the 4.2-km tunnel below Jarry Street and 24th Avenue following a sequence of events. Large portions Digging Montreal A Renewed Focus on Upgrading Aging Utilities Has Led to a Tunneling Uptick

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