McIntosh Perry provided detail design services to the Ministry of Transportation (MTO) for rehabilitation of the Liverpool Road Underpasses, the superstructure replacement of the Brock Road Overhead over Canadian National Railway (CNR) and Metrolinx corridors and rehabilitation of three concrete culverts to achieve an extension of service life. The scope of work included the inspection and detailed condition survey of all sites, topographic survey, field investigation of site and review the available background information in order to establish the appropriate scope of work for each site.

The road and highway engineering work includes the superstructure replacement design within the tight site constraints created by an adjacent signalized intersection and nearby Highway 401 overpass, as well as complex staging to maintain both roadway and rail traffic through the construction. The Liverpool Road Underpasses required a rehabilitation, including concrete patch repair, parapet wall replacement, and expansion joint replacement. Construction staging was a key part with the structure used heavily by commuters accessing a nearby GO station. The three culverts all required similar rehabilitation, which included partial depth patch concrete repairs and crack injection to soffit and walls, and repair of poorly performing joints. The CNR Overhead at Brock Road requires a superstructure replacement, which will be replaced with a concrete deck on steel I-girder structure.

Major components of this project included: structural design, traffic staging design and detouring, coordination with rail authorities, and environmental mitigation.

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