Oct. 13 - from Enbridge Centre, 18th floor
Building new Walterdale Bridge like assembling puzzle made with 125-tonne pieces
Constructing the new Walterdale Bridge is like tuning a harp, or building a bicycle wheel. Sort of.
On this bridge — what the city calls its most complex infrastructure project to date — it’s easier to use analogies. The physics involved might make engineering students shudder.
Think of it: steel cables thicker than your fist stretched by several inches as crews poured the concrete deck. Steel arches bent into a target shape as the cables were tightened one by one, like tightening spokes to shape a bike wheel.
Korean steel fabricators — widely criticized for delivering a year behind schedule — didn’t just deliver 125-tonne puzzle pieces, they delivered 42 pieces deliberately misshapen so the forces within the bridge could form it into the right geometry.
Only the lower segments are being welded together to avoid forcing workers to weld 40 metres in the air.
“At the end of the day, it all gets painted. It’s all going to be white,” said Teplitsky. But “if you look hard, you will still see them.”