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Roadbuilding | Engineering

October 1, 2007

North Arm Fraser River bridge marks a first for North America

Photo shows the finished Richmond half of the North Arm Fraser River bridge. This will be the first Extradosed bridge (a combination of balanced cantilevered and cable stay bridges) in North America. That’s engineer talk for a bridge that has to be high/wide enough for river traffic to pass under it, and low enough to provide clearance for the planes landing at YVR. The technical terms refer to the design and how it is built. First the columns are built, then sections are attached on one side of the column then the other so they’re balanced. Once the sections extend out far enough, a series of cables from the towers are attached to the bridge deck. The two sections should come together in November.

CANADA LINE RAPID TRANSIT

Photo shows the finished Richmond half of the North Arm Fraser River bridge. This will be the first Extradosed bridge (a combination of balanced cantilevered and cable stay bridges) in North America. That’s engineer talk for a bridge that has to be high/wide enough for river traffic to pass under it, and low enough to provide clearance for the planes landing at YVR. The technical terms refer to the design and how it is built. First the columns are built, then sections are attached on one side of the column then the other so they’re balanced. Once the sections extend out far enough, a series of cables from the towers are attached to the bridge deck. The two sections should come together in November.

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