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US 10,221,538 B2Granted
Helical pile leads and extensions
AssigneeHubbell Incorporated
InventorsAlan James Lutenegger, Gary Leonard Seider
Life of this patent
Estimating the term…
Abstract
The present disclosure provides helical pile leads and extensions with closely spaced perimeter shear helical plates that develop a cylindrical failure surface between the perimeter shear helical plates and soil as the helical pile is rotated into the ground, mobilizing soil-to-soil shear strength, and thus increasing the stability, stiffness and load capacity of the helical pile.
Claims17
A helical pile, comprising:
- a lead having a lead shaft with an end portion, a head portion configured to connect to an extension, and at least one load bearing helical plate attached at the end portion of the lead shaft;
- and
- an extension having an extension shaft with an end portion configured to connect to the head portion of the lead, a head portion, and a plurality of perimeter shear helical plates each having the same diameter that is less than a diameter of the at least one load bearing helical plate, the plurality of perimeter shear helical plates being attached to the extension shaft, each perimeter shear helical plate having a leading edge and a trailing edge separated from the leading edge a distance substantially equal to a pitch of the helical plate;
- wherein the plurality of perimeter shear helical plates on the extension shaft are spaced apart on the extension shaft a distance of less than three times the diameter of the perimeter shear helical plates so as to facilitate the creation of a cylindrical failure surface between the plurality of perimeter shear helical plates and soil when the helical pile extension is driven into the ground;
- and
- wherein the perimeter shear helical plate on the extension shaft closest to the lead is spaced from the at least one load bearing helical plate a distance that promotes the individual load bearing capacity of the at least one load bearing helical plate.
3 more elements
A helical pile, comprising:
- a lead having,
- a lead shaft with an end portion and a head portion, wherein the head portion is configured to connect to an extension;
- at least one load bearing helical plate attached at the end portion of the lead shaft;
- and
- a plurality of perimeter shear helical plates each having the same diameter that is less than a diameter of the at least one load bearing helical plate, the plurality of perimeter shear helical plates being attached to the lead shaft, each perimeter shear helical plate having a leading edge and a trailing edge separated from the leading edge a distance substantially equal to a pitch of the helical plate;
- wherein the plurality of perimeter shear helical plates on the lead shaft are spaced apart on the lead shaft a distance of less than three times the diameter of the perimeter shear helical plates so as to facilitate the creation of a cylindrical failure surface between the plurality of perimeter shear helical plates and soil when the helical pile is driven into the ground;
- and
- wherein the perimeter shear helical plate closest to the at least one load bearing plate is spaced from the at least one load bearing helical plate a distance that promotes the individual load bearing capacity of the at least one load bearing helical plate;
- and
- an extension having,
- an extension shaft with an end portion configured to connect to the head portion of the lead, and a head portion;
- a plurality of perimeter shear helical plates each having the same diameter that is less than a diameter of the at least one load bearing helical plate, the plurality of perimeter shear helical plates being attached to the extension shaft, each perimeter shear helical plate having a leading edge and a trailing edge separated from the leading edge a distance substantially equal to a pitch of the helical plate;
- wherein the plurality of perimeter shear helical plates on the extension shaft are spaced apart on the extension shaft a distance of less than three times the diameter of the perimeter shear helical plates so as to facilitate the creation of a cylindrical failure surface between the plurality of perimeter shear helical plates and soil when the helical pile extension is driven into the ground.
10 more elements
Dependencies are inferred from the claim text.