Helical Pile Association
The purpose of the Helical Pile Association is to advance helical pile and resistance piering technology within both the engineering community and construction industry as well as to provide homeowners a link to quality foundation repair solutions.
The HPA provides in-depth resources to help those within the industry become more accustomed to helical and resistance products and the advantages they can provide.
Through interaction with its members, the HPA also strives to provide continuing education on such important topics as new installation techniques, improving jobsite safety and many other issues that they may encounter on a daily basis.
The Helical Pile Association is partnered with the largest manufacturer of helical and resistance products in the world, A.B. CHANCE, a division of Hubbell Power Systems. A.B. CHANCE products are based on 100 years of earth anchoring research and development, by far the most experience in the industry.
The helical pile system is a segmented deep foundation system with helical bearing plates welded to a central shaft. Load is transferred from the shaft to the soil through helical bearing plates. As a result of their true helical shape, the helices do not auger into the soil but rather screw into it with minimal disturbance.
The first section, called the lead section, contains the helical plates. The lead section can consist of one to four helices. If required, additional helices can be added with the use of helical extensions.
Plain extensions are then added until the lead section penetrates the bearing strata and the necessary or appropriate torque is achieved. The true helix geometry of each steel bearing plate minimizes soil disturbance during installation.
The helical pile foundation is preferred over driven piles, drilled shafts, grouted tendons, auger-cast piles, belled piers and other deep foundation systems for a number of compelling reasons:
- Fast installation and immediate loading
- Eliminates high-mobilization costs associated with driven piles, drilled shafts or auger cast piles.
- Instant torque-to-capacity feedback for production control.
- Easily modified in the field.
- No need for concrete to cure.
- Uses common construction equipment easily fitted with hydraulically-driven torque motors.
- Easy to use in limited access sites, high water tables and weak surface soils.
The resistance pier system is a manufactured, two-stage product designed specifically to produce structural support strength. First, the pier pipe is driven to a firm bearing stratum; then the lift equipment is combined with a manifold system to lift the structure.
The Atlas Resistance® Pier System manufacturered by A.B. CHANCE provides measured support strength. Atlas Resistance® Piers are spaced at adequate centers where each pier is driven to a suitable stratum and then tested to a force greater than required to lift the structure.
This procedure effectively load tests each pier prior to lift and provides a measured Factor of Safety on each pier at lift.