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US 6,309,143 B1Granted
Composite pile with tapering lower portion and method for driving pile into granular soil
OwnerStanley Merjan, John Doughertyinventors
Life of this patent
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Abstract
A pile consisting of a tapered bottom section of polygon-shaped steel tubing and a top cylindrical section of steel tubing spliced together to form a composite pile, which, after being driven, is filled with concrete.
Claims27
In a pile having
- (a) a hollow uniformly tapered bottom load-bearing portion for extended engagement with the soil into which the pile is to be driven and to be filled with concrete after driving and
- (b) a hollow straight upper load-bearing portion, the improvement in which the said hollow tapered portion has a cross-section, taken perpendicular to a longitudinal axis, which is a convex polygon having at least four sides, said sides being substantially equal in length, said hollow straight portion has a cross-section, taken perpendicular to a longitudinal axis, which is circular, the very top end of said hollow tapered portion being formed to a circular cross section of substantially the same diameter as, and matching with, the cross-section of said hollow straight portion and the bottom end of said hollow straight portion being butt-welded to said top of the hollow tapered portion so that the load transfer from the top of the pile to the bottom is made by continuous bearing of said hollow straight upper portion and said hollow tapered bottom portion.
A process which comprises the steps of driving a pile having
- (a) a hollow uniformly tapered bottom load-bearing portion for extended engagement with the soil into which the pile is to be driven and to be filled with concrete after driving and
- (b) a hollow straight upper load-bearing portion, wherein, said hollow tapered portion has a cross-section taken perpendicular to a longitudinal axis of said tapered bottom portion, which is a convex polygon having at least four sides, said sides being substantially equal in length, said hollow straight portion has a cross-section, taken perpendicular to a longitudinal axis, which is circular, the very top end of said hollow tapered portion being formed to a circular cross section of substantially the same diameter as, and matching with, the cross-section of said hollow straight portion and the bottom end of said hollow straight portion being butt-welded to said top of the hollow tapered portion so that the load transfer from the top of the pile to the bottom is made by continuous bearing of said hollow straight upper portion and said hollowed tapered bottom portion into granular soil by hammer blows transmitted to the top of said tapered bottom portion and then filling said hollow portions with concrete.
Dependencies are inferred from the claim text.