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  Innovative Pedestrian Tunnels Construction Methods Beneath the Railway Corridor - 55-Hour Shutdown

  Kenaidan has completed construction of a number of pedestrian tunnels at various transit stations throughout the Greater Toronto Area. Recently, pre-cast tunnel construction took place at the Guildwood GO, Aurora GO, and Maple GO stations, where our teams meticulously planned a 55-hour shutdown period to complete the tunnel installations beneath the railway corridors.Typically, pre-cast tunnel segments, weighing approximately 34 tons each, are offloaded from trucks and lowered onto a steel frame known as a ‘grillage’ sitting at the bottom of a pit. From there, segments are adjusted into their final position, secured, and backfilled. Once the tunnels are completed, the tracks and platforms are then fully reinstated in time for resumption of train traffic.At the Guildwood GO Station, an innovative installation method was implemented to address the scope of work. Instead of the typical method, the pre-cast segments were pre-assembled on a temporary steel grillage and bolted together to form a complete tunnel prior to the shutdown timeframe.Once the shutdown period began, the team worked meticulously around the clock to complete all tasks associated with the installation. The fully assembled tunnels were then hydraulically jacked into place, grouted, and backfilled. The timelines were extremely tight, and work continued right down to the wire before re-opening the tracks for train service.Next, it was time for the Aurora and Maple site team to execute their installation shutdown weekend. The approach for this project followed the typical installation method. Despite facing challenging site conditions, cold temperatures, and snowy weather, the Aurora and Maple team met their strict timeframe and resumption of train service began as scheduled.Detailed preparation and specific work plans for each installation ensured that everything ran smoothly and according to schedule. The preparation work prior to the installation included: receiving and setting pre-cast segments, post-tensioning, waterproofing, and insulation. Each installation method presented various challenges to the teams, including: difficult site conditions, limited work areas, confined spaces, and environmental conditions.

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