ZUGGLIED FUER EINEN FELSBOLZEN ODER DERGLEICHEN

摘要

A tension member for use as a rock anchor or the like has a plurality of steel wires embedded in a tubular member with a central bore and formed of a hardenable plastics material, such as a synthetic resin. The outer surface of the tubular member is profiled such as in the manner of a screw thread so that an anchor member can be threaded on to the tubular member. The steel wires are arranged symmetrically around the axis of the tubular member for carrying the load transmitted by the tension member. If there is a displacement of the rock anchored by the tension member then both the tension and shearing stresses acting on the wires can cause individual wires to be displaced from the tubular member into its central bore. As a result, the flexibility of the tension member is increased and the most highly stressed wires can move out of the tubular member into its central bore.