A residential complex sits at the mouth of a municipal drainage culvert that feeds into an adjacent river. Runoff from a large storm had scoured the soil and undermined the retaining wall protecting the foundations of the residential complex. The City of Stamford was asked to address this issue and requested 26 helical piles be installed around the retaining wall footing.
Project Summary:
- Helical Pile Type: 2 1/4″ Square Shaft
- # of Helical Piles: 26
- Location: Stamford, CT
- Equipment Used: Kubota Excavator w/ 6K Drive Head and a shear pinn indicator.
- Challenge/Unique Aspect: The soil had been assumed to consist of heavy cobbles and dense sand; therefore, the 2 1/4″ Square Shaft pile was chosen to withstand the possible obstructions and high torque values required. Access would not allow any equipment for driven piles. Terrain and tree obstructions require the use of a tight-turning radius excavator that could traverse the terrain. The piles were placed throughout the riverbed and inside the residential complex.
