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Finch West LRT - Hwy 400 Bridge

Months of prefabrication work, intricate scheduling and the assistance of a self-propelled modular transporter with about two-dozen axles, allowed construction crews in Toronto to quickly replace a pair of vital bridge decks over the course of two busy weekends. The P3 consortium (Mosaic Transit Group) responsible for the new Finch West Light Rail Transit project, swapped out the bridge decks that carry Highway 400 over Finch Avenue at the north end of Toronto. The team took care of the southbound bridge between June 12 and 15, and completed the other half of the rapid bridge replacement (RBR) work June 19 to 22. The RBR method cuts down drastically on road closure times — an important feature along the busy north/south-running highway. 

The replacement work created few disruptions for commuters, construction crews have been preparing for the closures for months, prefabricating the new bridge decks on temporary structures adjacent to the highway. Once the pre-built bridge decks were ready, crews positioned a self-propelled modular transporter (SPMT) below the old southbound deck, cut away the supports and removed the mass of concrete and steel. The Mammoet SPMT then lifted the new deck, weighing approximately 1,500 tonnes, into place, where it was secured, reconnecting the highway. A week later the Moasic team repeated the process for the matching six-lane northbound 30m by 40m section. 

The complex bridge work is an essential part of Ontario’s Finch West LRT project, as the new rail line will run along Finch Avenue under Hwy. 400. It is one of several early stages of work on the light rail line that will eventually span 11km and include 18 stops.

Construction on the $2.5 billion project is expected to run through 2023.


Project Details

Location: Toronto, ON

Business Area: Bridges & Girders

Product: CPCI Girders

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