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Weston Tunnel - Phase 3 Grade Separation
Client:  Metrolinx / GO Transit
Prime Consultant:  AECOM Canada
Value:  $215 million

KO Constructors (JV of Kenaidan Contracting Ltd. & Obayashi Canada Ltd.)

The Georgetown South Weston Tunnel Phase 3 Grade Separation contract was part of the new Air Rail Link between Toronto's Union Station and Toronto Pearson International Airport. Located between Weston Rd. and Lawrence Ave., the contract consisted of lowering the rail corridor, constructing a concrete structure, with ballast and base slabs, retaining walls, and walls supported by struts, including a concrete covered portion between King St. and Church St. Track capacity was also increased to allow for the future expansion of 3 additional tracks.

The scope of the tunnel work consisted of a 185 m tunnel, 3 m in diameter, 20 m below King St., as well as a cast-in-place manhole shaft. The tunneling operation for the 3,000 mm super pipe will be achieved using a tunnel boring machine (TBM). Work under this contract is largely restricted due to the limited area available around the CN and CP corridor. Construction will be carried out in close proximity to significant buildings, as well as existing water mains, sewers, fibre optic works and live railways. This contract also included relocation of existing utilities, installation of a new King St. storm sewer, and the replacement of the existing sanitary sewer along Rosemount Ave. Precise scheduling was a key factor to allow for undisrupted GO/CP Rail Trains. This project placed 114,000 m3 of concrete during its 36-month schedule.

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