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Infrastructure Rehabilitation

Helical Pile Anchoring

Helical anchors can be utilized for construction over poor soils. This bridge located in Wolfeboro, New Hampshire was founded on 24 piles.

Helical piers are work well for geotechnical projects requiring a fast means of supporting compressive or tensile loads. Helical piles are quite versatile and can be used for various applications and loading requirements.

Common Benefits of Helical Piers:

  • Rapid installation
  • Little to no vibrations generated
  • Immediate loading capability
  • Torque monitoring during installations
  • All weather installations
  • Minimal disruption to work area

Helical piles consist of a steel shaft fabricated from either a solid square steel bar or tubular steel. One or more circular helical plates are welded on the shaft. These plates can vary in diameter from 6” to 16” and have a thickness of 3/8” or 1/2” depending upon the soil and the application. For a helical pile installation, the first piece consists of this lead section. The intention of the work is to advance this first piece through the poor soils and anchor it into the better soils below.

This technology can be used in several manners. First of all, a helical pile can be used to support foundations over poor soils. It is an effective alternative to traditional pile driving, especially when construction takes place in a heavily populated area. Pile driving is a major nuisance to areas immediately around the job area, whereas helical piles are essentially vibration-free and minimally impact the work site.

Buildings founded upon poor soil will excessively settle, causing unwanted cosmetic and potentially structural damage as well. In some cases, helical piles can be used to support a settling foundation and possibly even lift the foundation too.

Helical piles also work very well to retain soil. They are commonly used as tiebacks and soil nails in earth retention applications. As an alternative to grouted tiebacks, helical piles can be immediately loaded after installation. They can also have a higher rate of installation in favorable soils. Helical piers should only be designed by a licensed professional engineer.  

Contact us to see how we can help with your project.