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US 12,692,679 B2Granted
Concrete pier foundation with lateral shear reinforcing loops and methods of constructing the same
AssigneeTerracon Consultants, Inc.
InventorAllan P. Henderson
Life of this patent
Estimating the term…
Abstract
A concrete pier foundation having a plurality of sleeved tower anchor bolts embedded therein and a spiral loop encasement providing lateral shear reinforcement is provided. The spiral loop encasement surrounds at least a lower portion of the concrete pier and is formed by hoop steel wrapped around the perimeter of the tower anchor bolt cage. In proper soils or rock the spiral loop encasement can eliminate the need for corrugated metal pipes, reducing the cost and complexity of construction.
Claims18
A pier foundation comprising:
- a concrete pier formed in an excavation, the concrete pier including a plurality of sleeved anchor bolts embedded therein in an annular arrangement, the sleeved anchor bolts each having a lower end, and being secured together at their lower ends to form a bolt cage having an outer perimeter of the sleeved anchor bolts, the sleeved anchor bolts extending from adjacent a bottom of the pier foundation to above a top thereof, and a spiral loop flexible steel addition of an unrolled and windable continuous steel strand having opposing ends wrapped around the outer perimeter of the bolt cage and secured to the sleeved anchor bolts, individually, to provide lateral shear reinforcement to the pier foundation, and wherein the spiral loop flexible steel addition is wrapped around the outer perimeter of the bolt cage while the bolt cage is being lowered into the excavation, and
- the excavation including at least an annular area filled with concrete in which the bolt cage wrapped with the spiral loop flexible steel addition is embedded, with the opposing ends of the spiral loop flexible steel addition being embedded in the concrete, wherein the excavation is configured as an annular trench having a center area of undisturbed native soil, the annular area being defined by an inner wall and an outer wall of the annular trench.
A method of installing a laterally reinforced concrete pier foundation, said method comprising:
- excavating an annular trench having a center area of undisturbed native soil, an annular area being defined by an inner wall and an outer wall of the annular trench;
- assembling a tower anchor bolt cage having an outer perimeter including a plurality of sleeved anchor bolts in an annular arrangement, the sleeved anchor bolts each have a lower end and an upper end, and secured at their lower ends, the lower ends being adjacent a bottom of the laterally reinforced concrete pier foundation with the upper ends of the sleeved anchor bolts extending above a top of the laterally reinforced concrete pier foundation when the tower anchor bolt cage is placed within the annular trench;
- and
- wrapping the outer perimeter of the tower anchor bolt cage with, and individually securing the sleeved anchor bolts to, a spiral loop flexible steel addition of an unrolled and windable continuous steel strand having opposing ends over at least a lower end thereof to produce a wrapped tower anchor bolt cage and provide lateral shear reinforcement to the laterally reinforced concrete pier foundation;
- positioning the wrapped tower anchor bolt cage within the annular trench;
- and
- securing the wrapped tower anchor bolt cage with concrete after the wrapped tower anchor bolt cage is positioned within the annular trench with the lower ends of the sleeved anchor bolts at the bottom of the laterally reinforced concrete pier foundation, with the opposing ends being embedded in the concrete.
4 more elements
A pier foundation comprising:
- a concrete pier formed in an excavation, the concrete pier including a plurality of sleeved anchor bolts embedded therein in an annular arrangement, the sleeved anchor bolts each having a lower end, and being secured together at their lower ends to form a bolt cage having an outer perimeter of the sleeved anchor bolts, the sleeved anchor bolts extending from adjacent a bottom of the pier foundation to above a top thereof, and a spiral loop flexible steel addition of an unrolled and windable steel strand having opposing ends wrapped around the outer perimeter of the bolt cage and secured to the sleeved anchor bolts, individually, to provide lateral shear reinforcement to the pier foundation,
- the excavation being configured as an annular trench having a center area of undisturbed native soil, an annular area being defined by an inner wall and an outer wall of the annular trench, and
- the annular area being filled with concrete in which the bolt cage wrapped with the spiral loop flexible steel addition is embedded, with the opposing ends of the spiral loop flexible steel addition being embedded in the concrete.
Dependencies are inferred from the claim text.