Railway Interchange 2019

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Pedestrian Tunnel Installation under CN Mainlines in 44 hours - Collaboration between CN and Metrolinx (Room 101 D)

24 Sep 19
2:00 PM - 2:30 PM

Tracks: AREMA Technical Sessions By Date- Passenger & Tranist, AREMA Technical Sessions By Functional Group- Passenger & Tranist, Technical Sessions By Day- Tuesday

Canadian National Railway and Metrolinx completed a pedestrian tunnel installation under two (2) mainline tracks with no injury and ahead of schedule in a 48-hour workblock in 2018. The pedestrian tunnel is a cast-in-place concrete structure and it was casted within an excavated launch pit area. A horizontal jacking methodology was implemented to advance the tunnel installation in order to mitigate impacts on train operations. The cast in place tunnel section was advanced into final position by utilizing two – 100 ton telescopic cylindrical jacks acting in tandem mounted on a specialized sled jacking assembly. The jacking assembly was positioned on 1” (25mm) steel jacking plates. The tunnel section was advanced a total distance of 57’ (17.5m) until it reached its final destination underneath the two (2) mainline tracks. This paper will discuss planning, design and construction of the tunnel installation under two (2) CN mainline tracks during a consecutive 44-hr weekend work block. *Missed this Session or want to view it again? Stop by the VirtualAREMA kiosk located in the Registration area to purchase this product today!