Excavation Nearing its Final Stages at The One

Excavation on what will be Canada’s tallest building has progressed consistently since our last update four weeks ago. As one of Toronto’s most high profile development projects, The One by Mizrahi Developments will bring a 306-metre-tall Foster + Partners and Core Architects-designed building to one’s of the city’s busiest intersections. In May of this year, Michael Bros Excavation began work to create space for the building’s foundation, including one level of concourse retail and four levels of underground parking.

Three rows of tieback installation have been completed on the north, east and south sides of the site. These tiebacks serve to stabilize the below-grade caisson walls by anchoring them to the surrounding earth. Drilled holes and rebar are in place and waiting for grout work to begin on the final row of tiebacks, as the excavation heads towards its fifth and final underground level.

Diagonal raker beams along the north-west and south-west corners of the site serve to support the west side of the pit. These raker beams are more difficult to work around, as a result, excavation is roughly one level behind in this section. Before the raker beams can be removed, the new building’s foundation walls all have to be built close to and up against the west wall. Rakers are used when agreements to dig tieback anchors under adjacent properties cannot be secured with those landowners.

Excavation for the concourse retail level as well as the first 3 levels of underground parking is approximately what been completed to date. Based on the current pace, crews may reach foundation depth by the end of October. Construction plans indicate that the project will reach grade in the first quarter of 2019 from which point we can all begin watching Canada’s tallest building gradually rise into the sky.

Additional information and images can be found in our database file for the project, linked below. Want to get involved in the discussion? Check out the associated Forum threads, or leave a comment in the field provided at the bottom of this page.

October 4, 2018 12:25 pm | by Ryan Debergh