Toronto, ON
Strachan Avenue Grade Separation Overpass

This overpass is one of the grade separations for the Georgetown South (GTS) Project which will provide infrastructure improvements to meet existing GO Transit ridership demand and future growth. This project lowered a rail corridor connecting Toronto’s Union Station to Pearson International Airport, allowing a major road thoroughfare to pass overhead. The grade separation required extensive steel structural support. Strachan Avenue has been raised at most by two metres to pass over the existing rail corridor.

Our Role

Walters role was to provide the detailing, supply, fabrication and installation of the temporary and permanent struts, as well as architectural covers on the ends of each strut between three new concrete walls at the newly recessed rail line at Strachan Ave. We redesigned the covers to make them erectable along with the ability to be opened up by the client in the future for regular inspection.

Facts & Figures

  • Estimated Tonnage: 1,600 tonnes

  • 181 permanent struts each weighing roughly 5000 kg and measuring 18.2 meters in length

  • 116 temporary struts each weighing roughly 3000 kg

  • 242 architectural covers were installed to cap each end of the struts.

Overcoming Challenges

It was a challenge to pre-fabricate a strut that would fit onsite taking into consideration concrete tolerances. We fabricated an embed that was carefully positioned and surveyed, then fabricated the strut to fit between the two embeds. The strut was locked into position. The architectural cover needed to be constructed in such a way that it could be strong enough to be shipped/assembled on site in pieces, yet be able to drain water to protect the end connection of the strut.