MISSISSAUGA, ON

QEW Over Credit River

The existing concrete arch deck spans and floor beams of the QEW Bridge over the Credit River were deteriorated and required significant rehabilitation.

TRANSPORTATION

Completing the necessary rehabilitation works for the bridge would typically occupy traffic lanes using conventional construction methods.

Maintaining full traffic lanes across the structure during the rehabilitation works was critical for not increasing congestion on the QEW and was a mandated requirement for the project. Additionally, environmentally sensitive areas beneath the existing structure limited potential construction access.

The new structure was launched into place by incrementally building it from the existing structure’s west abutment. Once landing on the eastern pier of the existing arch bridge, the completed deck was jacked 5 metres vertically into its final position.

Entuitive was retained to develop a method of under deck support and an access plan that allowed full access to remediate the existing structure while maintaining full traffic on the bridge with limited disturbance to the wetlands beneath.

We developed a new “construction access deck” below the existing structure, supported on the tie beam between the arches. The “construction access deck” was a steel girder bridge with four 45-metre spans that allowed for the heavy construction equipment required for the bridge rehabilitation to access the work zones.