in Canada. Lucas Theofilou, assistant superintendent at Dufferin Construc- tion, the project’s general contractor, notes that the 2205-grade steel used in its construction is a duplex grade not usually seen a bridge such as this. The material was chosen for its aesthetics and longevity: duplex stain- less steel resists corrosion and requires less maintenance. The crane tasked with hoisting the colossal spans into place is equally impressive: it can reach upwards of 130 feet and has the capacity to lift almost 900 tonnes. Its operation is so specialized it always travels with its own union-certified operator as well as the many transport truckloads needed to carry its parts, which are typically assembled over a seven-day period. It was quite a sight to see the enor- mous crane hoisting the bridge’s 130-tonne stainless steel north span when it was put in place, overnight, last July. But the crane’s biggest impact has been on the project’s timing: it eliminated the prep work that would otherwise have been needed using smaller cranes in the railway corridors. Its speed of operation prevented track closures, presenting a huge advantage to all stakeholders involved. PROJECT PROFILE: GARRISON CROSSING The fact that the bridge spans are to be located over existing railway corri- dors was one of the project’s biggest technical challenges from the get-go – both in its design and in its construc- tion. “Considerations were given to the protection, safety and the security of both the railway operations and the pedestrians and cyclists using the bridge,” notes Juan Sobrino, CEO at Pedelta, a structural engineering firm, and the project’s lead designer. “Dura- bility was an especially important issue to consider for this project over the The enormous crane hoisted the bridge’s 130-tonne north span into place overnight Builders' Digest Quarter 3 2018 | 41