Patent ID: 9045878
Filing Date: 2015-06-02
Classification: E02D,E04C,E04H

Abstract:
1. A post-tensioned concrete foundation for supporting on its upper surface a tall tower or a structure subject to heavy load and high upset forces, said foundation comprising: a generally horizontal concrete foundation cap for supporting a tall tower or other structure from an upper surface and having a lower surface engaged with a ground surface; and a plurality of generally vertical post-tensioned hollow bar helical anchors circumferentially spaced from one another, each of said hollow bar helical anchors including at least one hollow bar helical anchor pipe extending downwardly from said concrete foundation cap lower surface into surrounding soil underneath said concrete foundation cap, and a tensioning element coupled to an upper end of said at least one hollow bar helical anchor pipe and extending through the concrete foundation cap, an upper end of each of said tensioning elements terminating above said concrete foundation cap upper surface, said tensioning elements pulling said cap downwardly and pulling the at least one hollow bar helical anchor pipe of each hollow bar helical anchor upwardly to post tension said foundation cap and said hollow bar helical anchors.