Engineers used a tunnel liner plate developed by Armtec to minimize construction complexity for a project to rehabilitate a concrete box culvert in Ontario in 2019. “Each plate is corrugated, curved and punched and then bolted together to form the design geometry,” explained Heba Ahmed, director of business development with Armtec.
The Shamrock Lake Concrete Culvert Rehabilitation project in northern Ontario faced a number of structural design challenges and required an alternative solution to bring the old structure back to life.
The cast-in-place concrete box culvert constructed in 1938 16 metres below Highway 11 and located 31.5 kilometres north of Nipigon, Ont. was failing and needed to be rehabilitated in order to maintain vehicular access on the stretch of highway above it.
The project was the subject of an Ontario Good Roads Association webinar held recently.The owner for the project was Northwestern Region MTO, the engineer was Hatch and the contractor was Teranorth Construction.Armtec’s Tunnel Liner Plate was selected for the rehabilitation. It is designed specifically for lining soft ground tunnels and relining existing conduits under highways and railroads.
“It is ideal for rehabilitating existing culverts because it can be constructed from the inside,” explained Heba Ahmed, director of business development with Armtec.“It’s available in different thicknesses which is dictated depending on the load demands. The plate itself me can be easily carried.
“Each plate is corrugated, curved and punched and then bolted together to form the design geometry.”