ALEXANDRIA, Va., Aug. 18 -- United States Patent no. 12,709,856, issued on Aug. 18.
"Post-tensioned helical anchors simultaneously spin-drilled and grouted and method therefor" was invented by Allan P. Henderson (Bakersfield, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An assembly and method of simultaneously spin drilling and pressure grouting a helical anchor into the ground vertically, horizontally or at an inclined angle create a continuous grouting configuration inside and outside the helical anchor for its entire depth in the ground. The helical anchor is configured to be partially or completely removed as desired and can be provided at its upper end with a tensioning element to post tension ...