Johnson Street Bridge
Location: Victoria, BC Contract Value: $63M
Subsequent to Somerset Engineering performing the erection engineering for the installation scheme of this bascule bridge, PCL awarded the structural steel and mechanical machinery erection to KWH Constructors. Located in Victoria, BC, the bridge is a single leaf, modified trunnion type, bascule bridge with a 50’ diameter ring with mounted turning rack and pinion systems. It is amongst the largest bascule leafs in the world. The drive machinery and the structural steel were set to very tight tolerances on site, with 3D alignment dimensions of a few microns. The ring support wheels and equalizers were installed first. The span counterweight box was then set on falsework, with the two circle track sections spliced to them one at a time using a large capacity floating crane. The main roadway leaf was erected in one piece during a weekend closure using the same barge crane. Sidewalks and bicycle lanes were erected separately. Other items KWH installed included the main machinery, CPU, room, stairs, handrail, platforms and a separate pedestrian bridge.
