This presentation will be delivered jointly by representatives from Dr. Sauer & Partners and STRABAG AG. The presentation will overview the project procurement, design and execution of the project.
The 180m long Highway 401/409 rail tunnel tunnels were excavated underneath North America’s busiest highway to increase the capacity of the existing rail corridor. The design, build and finance (DBF) contract was awarded in December 2017 to Toronto Tunnel Partners (TTP).
The final solution utilised two 10m high and 8.5m wide mined tunnels, fully pre-supported by 800mm diameter steel pipes installed from the two portals and an intermediate shaft.
This uniquely challenging project saw the new tunnels being excavated parallel to and less than 2m away from the existing tunnel and 2.5 to 4m below the 401/409 highways, whilst both assets remained operational throughout the project execution. The initial linings of the tunnels were almost in contact to fit inside the available corridor. The level of complexity of the project was enhanced by the very low mechanical properties of the soil and the numerous encountered obstructions.
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