Patent ID: 6309143
Filing Date: 2001-10-30
Classification: E02D,Y10T

Abstract:
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.