Port Mann Bridge Main Span Demolition

摘要

The original Port Mann Bridge (1964) is a three span tied arch with a main span of 1200' and side spans of 360'. The deep and fast flowing Fraser River with commercial shipping made temporary support in the water difficult to construct. Temporary towers and stay cables were instead used to de-construct the arch in cantilever working from mid-span back towards the piers. This procedure closely followed the original construction method, except in reverse.