Helical Pile
BRIEF CASE FACTS
Client:
Toronto Transit Commission (TTC)
G.C.:
Earthline Foundations & Shoring
Geotechnical:
GeoPro Consulting Ltd
Structural:
Morrison Hershfield
Piles:
60 Chance Helical Piles
Loadings:
Compression Load: 445 kN (100 kips)
Tension Load: 290 kN (65 kips)
Challenges:
TTC Queensway Track Rehabilitation
Toronto, ON, Canada
In 2017, the Toronto Transit Commission (TTC) rebuilt a 3 km length of track and overhead contact systems (OCS) from the Humber Loop to Parkside Drive in Toronto. For a majority of the project, caissons were a feasible design. The soil conditions changed to a deep, soft sand material with a high water table between Windemere Avenue and Parkside Drive, which made drilling caissons problematic. As an alternative, EBS Geostructural proposed the design and installation of CHANCE® Helical Piles to support the OCS poles. After design review, EBS was awarded the contract to design and install helical piles to support (15) OCS poles. Four (4) helical piles per pole base were designed to resist the compression, tension, overturning, and lateral loads to support the OCS.
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