Patent ID: 7533505
Filing Date: 2009-05-19
Classification: E02D,E04H,F03D,Y02E

Abstract:
1. A pile anchor foundation for supporting a heavy load from a ground surface comprising a concrete foundation cap having a bottom surface engaged with said ground surface and an upper surface supporting a heavy load connected rigidly thereto and a plurality of elongated pile anchors depending from said cap, each of said pile anchors including cementitious material extending into underlying soil a substantial vertical depth below said foundation cap, a void or a gap at an upper end of each pile anchor between said cementitious material of each said pile anchor and a bottom surface of said cap, each of said pile anchors further including a tension member anchored thereto and extending upwardly through said respective void or gap and said cap, a lower end of each tension member being anchored in said pile anchor, an upper end of each tension member including a post tensioning assembly which engages an upper surface of said cap to pull said cap downwardly, an upper portion of each tension member being movable in relation to said pile anchor and said cap to enable stretching of said tension member when the post tensioning assembly on the upper end thereof is tightened downwardly against the cap so that said upper end of the pile anchor moves upwardly into said void or gap and said cap is pulled downwardly and compresses underlying soil forming said ground surface, said cap bearing on the underlying compressed soil to withstand overturning and uplifting forces exerted on said cap by said heavy load connected to said cap.