Ministry of Transportation, British Columbia, Canada
Kiewit / Flatiron JV
McNary Bergeron worked closely with the Contractor to develop the demolition scheme for the Port Mann Bridge. McB then designed the cable stay system, the temporary steel tower, the connections to the existing steel arch, and the erection manuals for the demolition system.
Total Contract Value
$1.93 billion (USD)
2012 - 2014
Construction Method and Specifications
The demolition of the Port Mann Bridge Main Span closely follows the original construction method used in 1964, except in reverse. This system uses a 200' tall temporary stay tower on the bridge deck above each of the main piers and temporary stay cables to support the center arch as it is cut and removed piece by piece from the middle working back towards each pier. A series of temporary stay cables are installed, stressed, and eventually removed as the demolition work progresses. The stay system is composed of PT strand and heavy lift strand jacks that allow for precise adjustment of the stay forces during demolition. Extensive engineering work is required to confirm stability of the structure at every stage of de-construction.