Acrow Provides Long-span Modular Steel Replacement for Thessalon River Bridge in Ontario


Acrow recently announced that one of its long-span modular steel Delta bridges was installed as a permanent replacement for the aging single-lane Thessalon River Bridge on Highway 638 in Rydal Bank, Ontario. After evaluating other options, it was decided a wider 2-lane replacement was needed, and Acrow’s solution was selected to enable the best project outcome. The bridge was provided to the Ontario Ministry of Transportation (MTO) through project contractor The Miller Group.

The replacement project posed several challenges. Although situated in a remote area, the bridge provides access for emergency vehicles, so a short construction time was considered critical, with a maximum 15-day closure of the bridge permitted. In addition, the work site had an extremely limited footprint. Steep slopes on both sides of the east bridge approach prohibited its use as a temporary laydown area, so components were shipped to a nearby quarry pit where, after sorting, they were transported by truck to the construction site. Because timing was so vital, a fleet of 22 trucks was used to ensure a coordinated, efficient offloading of bridging materials.

The long-span Delta solution has a length of 67.5 m and a curb-to-curb width of 7.35 m to accommodate 2 lanes of traffic, plus a cantilevered footwalk on one side. The bridge has been designed with the capacity for 2 lanes of standard CL-625-ONT (64 t) and pedestrian loading and was provided with an epoxy aggregate anti-skid coating.

“Acrow’s cost-effective Delta system provided the perfect solution to this project with extremely limited access and a tight installation timeframe,” said Betul Oliver, Acrow Canada’s Business Development manager, Eastern Canada. “The speed of installation avoided the need for a detour structure, and kept the project on schedule and within budget.”

Source: Acrow

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