Weston Tunnel Grade Separation

The contract was part of the new Union Pearson Express between Toronto’s Union Station and Toronto Pearson International Airport. Track capacity was increased to allow for four additional tracks. 

Located between Weston Rd. and Lawrence Ave., the contract consisted of lowering the rail corridor, constructing a 1.2 km long 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. 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. This project placed 71,000 m3 of concrete during its 36-month schedule.

Work was largely restricted due to the limited area available around the CN and CP Corridor, and close proximity to significant buildings, as well as existing water mains, sewers, fibre optic works and live railways. The 3m diameter storm sewer pipe installation was achieved using a tunnel boring machine. Scope also included relocation of existing utilities 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.

Winner of the 2016 Ontario Concrete Award for Specialty Concrete and the 2014 Ontario Builders Award – Top Project Category 5.