Dr. Sauer & Partners' Elmar Feigl presents for Tunnelling Association of Canada

Tuesday, April 25th, 2023

On Thursday 27th April, Dr. Sauer & Partners’ Senior Tunnel Engineer in North America, Elmar Feigl will take to the stage as part of the TAC's (Tunnelling Association of Canada) series of monthly talks. He will present our work at Cedarvale Station on the Eglinton Crosstown Light Rail Line.

Cedarvale station was constructed as part of the Eglinton Crosstown Light Rail Line, under the operational Yonge-University Line Subway box of Toronto Transit Commission (TTC). The station was constructed as open-cut, which necessitated the underpinning of the existing TTC box to minimize the impact on the subway and allow its unhindered operation. Six mined galleries, each 4m wide by 2.75m high, were excavated sequentially (SEM), immediately under the existing box, to provide the required space for the installation of the main underpinning beams. This novel solution was executed successfully, providing quick access for the main excavation works to commence.

Through his presentation, Elmar will look at the detail behind the design and subsequent construction of this impressive project.

Completed Gallery 1A under TTC box

Completed Galleries 1A & 1B with whaler-beam above