Location
Toronto, Ontario
Expertise
Transportation
Bridges
Bridge Rehabilitation & Retrofit
Infrastructure
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The City of Toronto retained Associated Engineering to carry out detailed site inspection, preliminary and detailed design, tender package preparation, construction inspection, and contract administration services for the Don River Blvd. Bridge rehabilitation.
The bridge comprised a 24 metre single span CPCI girder bridge originally built in 1963. The superstructure, designed under the previous standards was found to not meet the current bridge design code. Through a geotechnical investigation, it was determined the capacity of existing substructure was not sufficient to take the load of a similar concrete superstructure and specified live load. Through a life-cycle cost analysis, a composite steel plate girder option utilizing the existing abutments was recommended and selected by the City to limit loading demands on existing substructure and minimize construction cost. Significant savings were achieved with use of existing pile foundations. The deck design included 90 millimetre thick partial depth precast deck panels, which helped to expedite construction. Semi-integral abutments were adopted in the new design to eliminate the existing and leaking joint seals.
Client
City of Toronto
Project Highlights
$2.1 million
Construction cost
24 metres
Bridge span
2021
Completed
Associated Engineering also carried out a hydraulic study (HEC-RAS) including a climate change sensitivity analysis. It was found the existing bridge elevation is under flood plain. An open light weight railing system was selected to improve hydraulic performance of railing during extreme flood event. Mesh facing was added to barrier for public safety in discussion with the City.
An electric subconsultant was retained to complete relocation designs of two high-voltage (70kV+) hydro poles to facilitate girder erection. Associated coordinated with subconsultant and Toronto-Hydro to secured timely approval for the relocation work.
The project construction continued through the winter of 2021 and was completed in May 2022.
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