Tuesday, June 12, 2012

First twin tunnels section completed for TTC subway extension

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First twin tunnels section completed for TTC subway extension TTC

The first 1.6 kilometers (one mile) of twin tunnels for the Toronto Transit Commission Toronto-York Spadina Subway Extension (TYSSE) in Canada has been completed.

The new tunnels represent one complete section of the twin tunnels that will connect the future Sheppard West and Finch West Stations. The tunnel boring machines (TBMs) named "Holey" and "Moley" bored the tunnels.

"Holey" broke through the headwall at the Keele Street extraction shaft on May 1, completing the first tunnelling milestone for the project. "Moley" broke through on June 4, completing the second tunnel for this section. The extraction shaft, where the TBMs arrived, is located in the center of Keele Street, just south of Finch Avenue West. Both TBMs are now being dismantled and moved to the second launch site and will bore the next section of tunnel between Sheppard West Station and Downsview Station.

The TYSSE project is an 8.6-kilometer (5.3-mile) extension of the Toronto Transit Commission's Yonge-University-Spadina subway line from its present terminus at Downsview Station to the Vaughan Metropolitan Centre at Highway 7. It will have six new stations, including one at York University. The expansion of the subway will bring the line into York Region, the fastest-growing region in the Greater Toronto Area over the past 10 years.

The TYSSE project is targeted for completion by the end of 2015.

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