Westbrook Pedestrian Overpass Replacement is Complete

September 10, 2020

Graham is pleased to announce the completion of the Westbrook Pedestrian Overpass in Calgary AB. This project included the construction of a new bridge structure with cast in place access ramps, demolition of the existing bridge and upgraded streetlighting and landscaping. The existing overpass crossing Bow Trail between 33rd and 37th Street SW was constructed in 1970, at a time when accessibility standards were much lower than they are today. Approaching 50 years old, the original bridge was exhibiting significant deterioration and had numerous structural deficiencies.

During construction we worked together with our project partners to detail and complete the unique architectural elements that were envisioned for this pedestrian corridor. To obtain these exacting details, Graham identified alternative construction methods which included laser cut foam formwork to build the curbs which were constructed along a radius, on an angle, and with a rounded top – a combination that is indicative of the details that were included on this project.

An additional challenge on the project included the arch structure, which was a combination of steel arches designed to tie into precast ends and connected to a cast in place deck. Tight fabrication tolerances and coordination between multiple subtrades was required to ensure each element fit together seamlessly. A key factor in Graham meeting the challenge were the temporary works and shoring needed to assemble each element of the bridge structure on site. Graham also designed and fabricated the formwork for the conical pier sections as local suppliers were not able to provide the formwork in time to meet the project schedule. This approach provided both schedule and cost savings and resulted in a high quality finished product.

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