This paper was first published in GE’s March 1968 issue
Part 2 of this paper was published in GE’s May 1968 issue
Ground anchors constitute a special application of prestressing in civil engineering, their use making it possible, for example, to excavate without bracing, to build retaining walls and other structures with economical anchorages, and to secure rock against movement. Rock and alluvium anchors, which are covered by the term “ground anchors,” consist of a prestressing cable fitted with a fixed anchorage, whose function is to hold the cable securely in the ground, and a movable anchor for tensioning the cable. A Swiss firm, Losinger & Co. S.A., have made a specialized study of the subject and as a result have produced the VSL anchors. The first application of the VSL rock anchor was ten years ago, though the alluvium anchor is a more recent development and was first put to use five years ago.