Toronto-York Spadina Subway Extension – Southern Tunnels


Toronto-York Spadina Subway Extension – Southern Tunnels


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This project $90 million project for the Toronto Transit Commission was awarded in November 2010 with a completion date of Sept. 30, 2013. The project, to extend an existing subway line northward and into York, included approximately 5,400 m (17,700 ft) of tunnel using two owner-supplied Caterpillar (Lovat) EPB TBMs. The bore diameter was 6.1 m (20 ft) with a finished diameter of 5.4m (17.7 ft). The invert varied from 20 to 30 m below surface. Soils included clay, sand, silts and mixed face conditions. Also included in the project was four hand-mined cross passages, 4.2 m (14 ft) diameter and approximately 9.1 m (30 ft) long, and three hand-mined connections to EEB shafts, 4.2m (14 ft) diameter, as well as placement of invert and walkway concrete in tunnels. At press time, all excavation was complete with final clean out under way in advance of handover to the owner.

Tunnel Designers/Administrators included Hatch, Delcan and Morrison Herschfield. Armtec served as segment manufacturer. Other subcontractors included Verdi Alliance (Concrete), Smith & Long (Electrical), Groundforce (Tunnel Spoil Removal), Salit Steel (Rebar), and AME (Geotechnical Monitoring).

Key Project Personnel: Project Manager: Jeff Reid; Project Engineer: Adam Gould; General Superintendant: Sean Gamble; HSE Advisor: Steve Brophy; Contract Administrator/Coordinator: Josh Campbell.


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