Due to weak, unstable soil, a house and garage needed to be supported on a deep foundation. No geotechnical report existed so piles had to respond to a torque specification of 6,000 ft. lbs. This ensured that the pilings would reach a suitable bearing strata (around 20′) that could support the load.
Project Summary:
- Helical Pile Type: 2 7/8″ .276 (Sch.80) Round Shaft Ideal
- # of Helical Piles: 51
- Location: Nantucket, MA
- Installation Depth: 20’
- Equipment Used: Caterpillar
- Challenge/Unique Aspect: Deep foundations were necessary in this area of Nantucket Island. Helical piles were selected as a neighbor friendly alternative to timber. In addition, helicals react to the shear strength of the soil and, through torque values, indicate where the piles need to be terminated.
- General Contractor: Gencorelli Engineering
