*Project led by Eric Gordon, Michael Meschino, Mike Hillcoat, David Thompson and Chongsong Yu while employed at a previous firm.
Zeidler Partnership Architects
GO Transit, a division of Metrolinx
30,000 m² (325,000 ft²)
Prime Consultant, Structural Engineering Consultant, Rehabilitation Consultant, Waterproofing Consultant
The revitalization of Canada’s busiest transportation hub, Toronto’s Union Station, is one of the highest priority developments under “The Big Move,” Metrolinx’s long-term integrated transit plan for the Greater Toronto region. Multiple projects at Union Station will increase the station’s capacity, improve passenger flow, allow more trains into the station, modernize the facility and rehabilitate heritage elements.
A new steel and glass atrium, designed as a massive light box, will replace the middle third of the train shed roof to allow in natural light. The rest of the existing Union Station train shed roof structure will be rehabilitated and become a green roof almost five acres in size.
In addition to structural, aesthetic and environmental upgrades, over 50 new stairs, elevators and escalators are being added to reduce passenger wait times and improve flow between track-level and the main station building.
Challenge: Crews need to cut new stair, elevator and escalator openings through the 100-year-old track slab, while the slab continues to support train traffic at track level and sits above pedestrians using the concourse level below.
Solution: An intricate finite-element analysis was performed to strategically locate the openings. The project team sought to minimize or eliminate temporary shoring and permanent reinforcement, and to examine the structural feasibility of cutting the new openings. The opening slab reinforcement design had to be continuously refined as opening sizes and locations were coordinated with the City of Toronto Concourse Expansion project.