May 22, 2008
Lighter, less expensive and more environmentally friendly than other bridge structures
VALUE ENGINEERING CASE STUDY
Built in response to an engineering challenge faced by Peter Kiewit Sons Co. Ltd., the Kemess Arch uses AIL’s exclusive Super-Cor with Encased Concrete technology to provide a bridge solution that is lighter, less expensive and more environmentally friendly than other bridge structures.
Spanning 20 m without disturbing the waterway
In April of 1997, Royal Oak Mines required a bridge to sustain the loads of 390-ton mine trucks crossing the Kemess Creek at a new open-pit mine deep in the British Columbia mountains. The Ministry of Environment insisted that the construction of the bridge leave the stream bed undisturbed, calling for a clear span of over 20 metres.
30% savings over precast concrete arch
Instead of a precast concrete arch, Peter Kiewit opted for a Super-Cor Steel Arch with encased concrete reinforcement and welded wire-mesh MSE Retaining Walls, both from AIL. The resulting Super-Cor bridge was designed and built faster than a concrete bridge. It met both engineering and environmental requirements with ease, and saved 30% over a conventional concrete arch solution.
Installed in a fraction of the time
The arch was installed in two weeks, with three weeks required for the completion of the wire walls and backfilling. Sections were bolted together and lifted into position and 15 encased concrete ribs were poured in a single day. The structure was completed on schedule and in full compliance with strict environmental regulations.