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Project Date
2015
PROJECT CATEGORY
Civil
Client Name
KPH Turcot
Montreal, QC

CN Ste-Ann-de-Bellevue
Tunnel

Project Services
  • Abatement
  • Demolition
  • Recycling
Project Date
2015
PROJECT CATEGORY
Civil
Client Name
KPH Turcot

CN Ste-Ann-de-Bellevue
Tunnel

Montreal, QC
Project Services
  • Abatement
  • Demolition
  • Recycling
Safe and Efficient Dismantling of CN Ste-Anne-de-Bellevue Tunnel
Dismantling of a Railway Tunnel as Part of the Turcot Interchange Reconstruction Project
Project Overview
Delsan-AIM was subcontracted by the KPH Turcot consortium to dismantle a railway tunnel as part of the Turcot Interchange Reconstruction, a major $3.7 billion civil infrastructure project in Montreal, Quebec. The tunnel was located beneath Boulevard Ste-Anne-de-Bellevue and was part of a critical Canadian National (CN) transportation corridor with four active railway tracks.

Due to the presence of active rail traffic and asbestos-containing fireproofing material, the project presented unique challenges requiring precise coordination and safety measures.
Dismantling Strategy and Execution
Tunnel Exposure and Structural Assessment
  • The tunnel was initially exposed to facilitate the dismantling process.
  • The original structure consisted of a 30 ft. high, 74 ft. wide, and 333 ft. long three-sided reinforced concrete box culvert with concrete footings.
  • A 54 ft. extension to the original tunnel had a different structure with reinforced concrete box girders spanning the railway tracks.

Hazardous Material Abatement
  • Asbestos-containing fireproofing material was identified on the ceiling of the main tunnel.
  • The material was safely removed using high-risk asbestos abatement procedures with excavators equipped with scarifiers.

Extension Dismantling
  • The tunnel extension was dismantled in sections:
  • Method: Saw-cutting and removal of box girders, slabs, and retaining walls.
  • Weight: Each box girder and slab weighed 85,000 lbs, with the heaviest lift reaching 114,000 lbs.
  • Equipment: A 500-ton mobile crane was used to lift and remove these heavy materials.

Original Structure Dismantling
  • The original tunnel was dismantled in nine sections, each weighing 1,100 tons.
  • Method: A gantry crane positioned over the tunnel, utilizing self-propelled modular transporters (SPMTs) to move sections to a laydown area.
  • Temporary Level Crossing: A crossing was built to position the gantry crane for efficient section removal.

Final Demolition
  • After asbestos abatement, large excavators were used to demolish the remaining structure.
  • Debris Removal: The debris was carefully shipped off-site for recycling.

Safety and Coordination
  • The project required precise coordination with CN operations to maintain train traffic and protect existing infrastructure.
  • Safety measures were paramount throughout the dismantling process to protect both workers and the surrounding community.

Project Outcome
Delsan-AIM successfully dismantled the CN Ste-Anne-de-Bellevue Tunnel as part of the Turcot Interchange Reconstruction project, adhering to stringent safety and environmental protocols. The work was completed on schedule, ensuring minimal disruption to rail traffic while preparing the site for future development.