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News » Canada » FCC and OHL complete Toronto subway extension » published 20 Dec 2017

FCC and OHL complete Toronto subway extension

FCC and OHL have been granted the ‘substantial performance certificate for their $404m tunnel and station project as part of the $3.2bn Toronto-York Spadina subway extension.

The Toronto Transit Commission’s award of the certificate marks the joint venture’s last contractual milestone and a final step towards achieving contract completion of the joint venture’s first Canadian transit infrastructure project. It has built the project’s northern tunnels and Highway 407 Station & Bus Terminal.

The station and adjoining bus terminal together form a transit hub along the Northwest segment of the Toronto Transit Commission’s Yonge-University line. The station is an underground reinforced concrete multi-level structure. Adjacent the station is a one-storey, three-winged, steel framed bus terminal with an 18-bay capacity for York Region and GO Transit buses. A 600-space commuter parking lot and 30-space passenger pick-up and drop off area form the final part of the site plan. 

The second core component of the project is the Northern tunnels contract including 3.85km of twin 6m-diameter tunnels, mined by tunnel boring machines (TBMs). The work has also involved a 200m sequential excavation method (SEM) tunnel, two reinforced concrete box crossover structures, four emergency exit buildings and three cross passages to connect the tunnels.

During the tunneling phase, the rate of mining on average was 21m per day, reaching a one-day maximum of 46.5m. In particular, tunnelling beneath sensitive buildings at York University was completed while only causing 3mm of settlement at the surface.

Completion of the 200m SEM hand-mined tunnel is also considered to be a great accomplishment, because of careful consideration was required due to the tunnel passage beneath existing power transmission corridors and major gas pipelines.  It marked Canada’s first use of the technique.



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This article was published on 20 Dec 2017 (last updated on 20 Dec 2017).

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