| 摘要 |
The invention provides a grouted rock bolt which includes, an elongate body of a suitable steel material having, a first distal end and an opposed second 5 proximal end, a threaded portion at the second end, a first end portion extending from the first end of the body which is adapted with a first plurality of integrally formed anchors, at least one integrally formed anchor on the body, between the threaded portion and the first end portion, a first stem portion between the first end portion and the at least one integrally formed 10 anchor, wherein the first stem portion has a smooth cylindrical surface; wherein each integrally formed anchor is a flattened formation that exceeds the diameter of the body and which defines a plane; and wherein each integrally formed anchor is adapted to be harder than the stem portion. - 1/2 3cFIGR I B' |
