Mill Pond Estates

Mill Pond Estates

Shotcrete: Low Cost and Overcoming Hillside Access Issues

This 12,000 sq. ft. project involved temporary hillside shoring for a developer in Tillsonburg.

  • The project was completed during winter months with winter protection of panels and concrete and special measures by HC Matcon designed for winter conditions.
  • The shotcrete shoring solution was both low cost and viable due to the hillside access issues. The final building is designed to take the hillside load through concrete shear walls and footings.
  • Soil nail walls do not involve stressing the anchors, while HC Matcon practices the Vancouver method of Shotcrete shoring which used strict panel sequences with post tensioning of anchors to reduce movement.
  • Total station monitoring can track vertical and horizontal movement of the typical Shotcrete shoring wall by fixing targets to the shoring wall as it is constructed. Work proceeds in 5-6 Ft. vertical lifts, so a project schedule is typically the height of cut, divided by 5 in weeks.

Client: Mill Pond Estates
Location: Tillsonburg, Ontario

Paruk Residence

Paruk Residence

Overcoming Poor Soil-Bearing Capacity

The Paruk Residence is a high end two story structure, located at 24 York Valley Crescent in North York, Ontario, just north of the Don River. A geotechnical investigation performed by Patriot Engineering revealed very poor soil bearing capacity, unsuitable for a slab-on-grade or strip footing foundation.

  • The floor slab was designed as a structural slab supported on grade beams resting on helical pier foundations. The helical piers were 2-7/8 inch diameter, 55 ksi minimum yield strength, galvanized, and supplied by Ideal Group.
  • The helical piers were designed for a maximum 30 kips working load, which was achieved at a torque resistance of approximately 9,000 ft. lbs. Using a 17,000 ft. lbs. McMillen drive unit, 94 piers were installed in 3 days.

HCM also did the excavation, perimeter shotcrete shoring and U/S stone placement c/w geotextile, which helped construction access and provided a clean surface for the concrete form work contractor.

Client: HC Matcon
Location: Toronto, Ontario