Patent ID: 7886490
Filing Date: 2011-02-15
Classification: E02D,E04C

Abstract:
1. A strand placed in a bore hole provided in a wall or roof surface and gripped by a wedge in a tensioned state so as to apply a tensile force to the wall or roof surface, the strand comprising: a pipe-shaped member made of metal; and a plurality of metal wires arranged on the outer periphery of the pipe-shaped member, wherein the metal wires are arranged to surround the pipe-shaped member on the cross section of the pipe-shaped member, wherein the total distance between the wires is 0.2 mm or more, and is smaller than an outer diameter of the pipe-shaped member, and wherein the strand has flexibility such that the pipe-shaped member is not squashed even when the strand is bent with a bending diameter that is 12 times a diameter of an envelope circle of the strand.