BRIEF CASE FACTS
Alston Associates Inc.
30 Chance Helical Piles
180 kN (40 kips)
Limited access, existing structures
Toronto, ON, Canada
A parking structure ramp needed to be constructed between two existing buildings. Support of the existing structure was necessary while the soil beneath the foundations was removed and the foundations extended deeper.
EBS Geostructural installed Chance® Helical Piles to provide support once soil beneath the foundation was removed.
Pile and lagging was not an option as it could not be constructed within specification of zero clearance from outside of footing Soil profile consisted of a layer of fill and then to a native silty clay
Conventional underpinning was determined to be too costly as depth of the new foundations was 4-5 meters below existing foundation. Access was limited due to the existing structures in close proximity. Vibrations during construction had to be minimized due to the condition of the surrounding structures.
EBS Geostructural was chosen to install Chance® Helical Piers for this project.
No vibration during installation
More cost effective solutions than traditional technologies.
Helical pier shaft encased by a steel casing to provide lateral support once soil beneath foundation was removed (approximately 4.6 meters (15 feet) below the underside of footings.
Loads: 180 kN (40 kips) per helical pile
Length: 8.0 to 11.0 m (26 to 35 ft)</p>