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US 6,468,003 B2Granted
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 includes a tapered bottom section of polygon-shaped steel tubing and a top cylindrical section of steel tubing spliced together with a transition ring to form a composite pile, which, after being driven, is filled with concrete.
Claims29
In a pile having
- (a) a hollow uniformly tapered bottom 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 pipe having a cross-section, taken perpendicular to a longitudinal axis, which is circular, the improvement in which the cross-section, taken perpendicular to a longitudinal axis of said tapered portion is a convex polygon having at least four sides, said sides being substantially equal in length, said tapered portion being connected to said pipe by a transition ring having a lower portion of polygonal cross-section fitting into the top of said tapered portion, said ring having an upper socket of circular cross-section into which said pipe is received.
Dependencies are inferred from the claim text.