Patent ID: 7789593
Filing Date: 2010-09-07
Classification: E21D

Abstract:
1. A grout pack restraining system, comprising: (a) at least one elongate element forming a ring to extend about and control circumferential expansion of a grout pack, the at least one elongate element having at least one self-expanding expansion zone adapted to permit a diameter of the ring to be increased under a radial force from a first diameter to a second diameter without material deformation of the at least one elongate element; and (b) wherein the at least one elongate element includes first and second opposing ends connected to each other in an overlapping configuration to form the at least one expansion zone, the first and second opposing ends being adapted to move relative to each other a predetermined distance during expansion of the ring from the first diameter to the second diameter and are connected to each other by at least one chain link arranged with its longitudinal axis inclined to that of the elongate element to provide a predetermined swaging force, thereby creating a predetermined frictional resistance to movement between the first and second opposing ends and providing a progressive yield of the grout pack.