Twenty Gothic, Toronto / Monarch Construction

situation:

Twenty Gothic is an upscale, mid-rise condominium residence located steps away from a subway station, local shops and restaurants. It’s also across the street from High Park, where acres of parkland and playing fields are a year-round attraction. The building foundation however was actually going to span the tracks of the subway, which meant that there was no choice but to isolate the entire building from the subway.

assessment:

The location and construction of the building was such that it could not be isolated at the foundation, as is normally done with this type of isolation system. Instead, the building was isolated above the parking garage. The level of isolation required was extreme as the subway runs right under the building.

solution:

Our solution consisted of mounting the entire structure on natural rubber vibration isolation pads ensure that vibration energy from the connected subway tunnel does not transmit into the condominium, and lateral support isolators around the perimeter for resistance to seismic loads.

Aercoustics worked with Reid Jones Christopherson, the structural engineer, to incorporate the isolation system into the transfer beam structure that spans the subway tracks. Aercoustics helped size the transfer beams to optimize the vibration reduction, and designed and specified the isolation pads. The pads are 12″ thick, and each one weighs several hundred pounds.