Helical piles are a factory-manufactured, steel foundation system consisting of a central shaft with one or more helix-shaped bearing plates, commonly referred to as blades or flights, welded to the lead section.
Brackets are used at the tops of the piles for attachment to structures, either for new construction or retrofit applications. Helical piles are screwed into the ground with the application of torque.
Extension shafts, with or without additional helix blades, are used to extend the pile to competent load-bearing soils and to achieve design depth and capacity.
ADVANTAGES OF HELICAL PILES
For many applications, helical units may offer significant advantages over other systems. Some of these include:
- A wide range of allowable loads up to 500 tons.
- Adaptability to a variety of installation angles
- Lower cost than driven or drilled piles – do not go as deep to reach the same capacity
- .Immediate Load Carrying Capability
- Ease and speed of installation
- Minimal support equipment
- Suitability for low-headroom and other limited-access areas
- Easy pile cutoffs
- No concrete-related delays
- Little or no dependence on weather
- Little or no earthwork and spoil material (a particular advantage at contaminated sites)
- Installation in High Groundwater Conditions
- Minimal vibration and noise
- Easily removed and reused in temporary applications
- Very low mobilization and demobilization cost
- Environmentally friendly