Helical piles are a form of prefabricated deep foundation. As hinted in its name, helical piles differ from other deep foundations and are most notable for having spiraling blades along their shafts, as opposed to having a relatively uniform shape like driven piles and micropiles.
Some other names for helical piles include helical piers, helical anchors, screw piles, and screw foundations. While there may be some minor differences in particular naming conventions, these names are often used interchangeably. At the very least, the principle between all of these remain the same.
The first item of the helical pile is called the lead; this is the piece that is first revolved right into the ground. The lead has multiple helical blades, also referred to as helical bearing plates, that can differ in size, form, and also number.
The shaft can come in either a circular or a square cross section shape and is typically hollow.
Screw piles, sometimes referred to as screw-piles, screw piers, screw anchors, screw foundations, helical piles, helical piers, or helical anchors are a steel screw-in piling and ground anchoring system used for building deep foundations.
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