Construction crews are utilizing a powerful roadheader machine to excavate the future King-Bathurst station for the Ontario Line subway. The sequential excavation method is being employed, taking advantage of the natural strength of the surrounding earth.
Work on the future King-Bathurst station as part of the Ontario Line has reached a new stage deep below the surface. According to a LinkedIn update by Ontario Transit Group, a joint venture between Ferrovial Construction and Vinci Construction Grands Projets, the construction team is employing a sequential excavation method, leveraging the natural strength of the surrounding earth to efficiently dig underground.
Specifically, they are utilizing a roadheader machine, equipped with a rotating cutter head and pivoting arm, granting flexibility in shaping the tunnels and caverns required during this phase of excavation.This roadheader machine, as reported by Metrolinx, is a formidable piece of equipment, measuring 22 meters in length, weighing 115 tonnes, and capable of processing 1,000 tonnes of material daily. Its operation lies in the sequential excavation method. The machine's versatility stems from its computer-guided rotating cutter head, featuring tungsten carbide teeth, allowing it to navigate through various rock formations. Roadheaders are also fitted with gathering arms that transport the excavated rock to a conveyor belt system at the machine's tail, simultaneously loading a truck. Furthermore, the crawler track enables the machine to advance during excavation. 'As segments of tunnel are excavated, temporary support systems are implemented such as concrete and rock bolts, maintaining the tunnel's shape as work progresses,' Metrolinx explains. 'The flexibility and maneuverability enable it to operate in smaller, more confined areas to create underground space for the Ontario Line's future stations.'Upon completion, the Ontario Line will be a 15.6-kilometer subway line featuring 15 new stations. It will traverse from Exhibition Place, through downtown Toronto, and ultimately connect with the Eglinton Crosstown LRT at Don Mills Road
ONTARIO LINE KING-BATHURST STATION ROADHEADER MACHINE SEQUENTIAL EXCAVATION TORONTO SUBWAY
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