AIL products flex muscles in key bridge replacement.
The scope of this project was to install a Super•Cor® Box Culvert and MSE Structural Walls with Precast Panels. The structure crosses over Stringer Creek located at km 638.7 on the Alaska Highway about 5 km or so south of Toad River. It supports the main highway with a CL-625-ONT loading. Design life was 80 years.
The job at hand.
The associated MSE wing walls featured precast concrete panels. Cast-in-place work consisted of the footings, headwalls, coping, collar over the structure and splash wall inside the structure, casted on top of the footings inside. The highway was realigned onto the new crossing, then the existing String Creek Bridge was demolished.
Added protection designed in by AIL.
The structure is on cast-in-place footings over piles, has an inside span of 86.6 m with an inside rise of 31.4 m, and is 197 m long. The cover range is 757 mm to 972 mm, including asphaltic concrete pavement overlay with a depth of 100 mm. The splash wall is a unique feature. It was added because Stringer Creek moves a huge amount of water in big rain events and during snow-melt. The water typically carries large boulders, so the owner wanted the inside of the structure armoured with the concrete wall. The concrete visible in the picture is actually the top half of the splash wall, not the footings, which are buried.
Quick to install.
The structure took approximately 3 1/2 days to erect and torque.
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