Abstract: A method for restressing and locking HHL anchor, comprising a bearing plate placed between a gripping wedge and ground, a bearing shell is mounted over and connects with a jack, a load cell and a nut in series, a jack rod is inserted within the jack and has its lower end threaded inside for engaging with the gripping wedge and then determines the tension of the strands, characterized by providing a tension rod with a lower threaded end outside engaging with the bore of gripping wedge and a upper polygonal convexity fitted with a polygonal concavity of an extension rod having a upper polygonal end and inserted within the upper portion of the jack, operating the jack and jack rod for forcing the gripping wedge upwards for restressing said tension strands, and then, while maintaining the wedge in the restressed position, using a wrench for turning the extension rod as well as the tension rod downwards until the end of the tension rod touches the surface of the bearing plate for obtaining 100% restressing of the

Abstract: Disclosed herein an improved ground anchor with recoverable steel rods which is characterized by the design of a socket having a plurality of tapered holes for fixing of steel rods from the top and two semi-conical wedges at the bottom of each hole to fix the steel rods by frictional force. The fixing holes are designed with external wall having tensile strength smaller than that of the steel rods so that application of any normal extractor to pull out the steel rods will distort and break the external wall of the holes first, the friction among the semi-conical wedges and steel rods will be overcome consequently, and thus the steel rods can be extracted and recovered easily. It is further characterized by the design of swingable arms, each with a left cutting edge in a form of slightly turning outward for cutting earth in order to ease its extension, and a recession at the external curved surface to reduce friction between the swingable arm and the earth.

Abstract: This invention relates to an improved ground anchor. It comprises a drill bit, an anchor head to which a plurality of swingable arms are pivoted, a double thread nut, a connecting rod with an enlarged rear end, and a socket from which a plurality of steel rods extend rearwardly. It greatly facilitates the work of ground anchorage of a surface structure.