Abstract: A cable bolt has a multi-strand cable, and a sleeve having at least one open end. The sleeve has an outer surface and an inner surface. The outer surface of the sleeve is at least partially threaded. An end portion of the multi-strand cable is disposed inside the sleeve. A bonding material is disposed between the inner surface of the sleeve and an outer surface of the end portion of the multi-strand cable. The bonding material bonds the sleeve to the multi-strand cable.

Abstract: A load-measuring coupling device for rock anchors comprises a body having a threaded section for receiving a bearing plate and a nut, and a hollow section having a threaded hole to allow a threaded rock anchor head to be fitted thereinto. The body has a central blind hole extending from the threaded section for receiving a strain gauge lengthwise therein, to sense the axial stretch induced in the gauge due to applied loads on the rock anchor head. The strain gauges are attached to a connector located at the threaded section, which permits the transmission of the strain gauge signal to a reader unit. The coupling device is attached to the rock anchor and the assembly is inserted in a hole in a mine. The rock anchor can be pre-tensioned with a shear pin in the hollow section or a jamming nut in the threaded section.

Abstract: A cable bolt has a multi-strand cable, and a sleeve having at least one open end. The sleeve has an outer surface and an inner surface. The outer surface of the sleeve is at least partially threaded. An end portion of the multi-strand cable is disposed inside the sleeve. A bonding material is disposed between the inner surface of the sleeve and an outer surface of the end portion of the multi-strand cable. The bonding material bonds the sleeve to the multi-strand cable.