Last April, following heavy rainfall in the previous days, a galvanized corrugated steel culvert (GCSP) located under Highway 25 collapsed. A crater 7 m deep by 9 m wide was formed in the central strip of the highway, at the edge of the northbound passing lane. Highway 25 was then closed in both directions at Highway 339. To ensure the safety of motorists, a bypass road had to be set up at Exit 44 leading to Saint-Roch-de-l’Achigan.
In order to carry out this emergency repair, the Government of Québec decided to award a private contract with L.A. Hébert, a contractor recognized for the quality of its work. The consulting engineering firm CIMA+ quickly assessed the possible materials for this project, concluding that the high-density polyethylene large-diameter pipe was the best, if not the only, valid alternative for the replacement of this culvert. To complete the work, the pipe diameter was increased to 3355 mm (132 in). Nine pipes totalling 105 metres were installed and welded in place to ensure a perfect seal.
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