COUPLED DRIVE RODS FOR INSTALLING GROUND ANCHORS

摘要

Ground anchors are installed by drive rods or gads connected in end to end relation by sleeves or couplers which accommodate sliding of adjacent rod ends into abutting relation under impact or compression loads and which retain the rods in connected string relation under tension loads. The sleeves have smooth rolled internal rope type threads in their end portions separated by a slide chamber receiving mating threads on end portions of adjacent rods which are threaded through and beyond the internal threads into the slide chamber. The rods slide in the sleeves and ends of adjoining rods will abut under compression loads and separate under tension loads while still being retained in end to end relation. A string of drive rods is successively built up to be impacted successively from ground level.