Multiple-point anchored rock bolt
AssigneeNcm Innovations (Pvt) Ltd
InventorsMartin CAWOOD, Paolo Ettore PASTORINO, Phillipus VAN DER MERWE, Samuel DU PLESSIS
Life of this patent
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Abstract
A rock bolt includes an elongate metallic body having a first end and an opposed second end, a threaded portion at the second end, for attaching thereto and locating thereon, a nut and a bearing plate, a mechanical anchor at, or at least partially located on, a first end portion of the body and a first resistive anchor, located between the threaded portion and the mechanical anchor.
Claims17
A rock bolt for being grouted in a borehole in a rock which includes an elongate body of a suitable steel material having a first distal end and an opposed second proximal end, a threaded portion at the second end, a mechanical anchor or a composite anchor at, or at least partially located on, a first end portion of the body, a second anchor integrally formed on the body, between the threaded portion and the mechanical or composite anchor, a first stem portion between the mechanical or composite anchor and the second anchor, and a second stem portion between the second anchor and the threaded portion, wherein the first and second stem portions have a smooth cylindrical surface, and wherein the second anchor is adapted to exceed the diameter of the body in at least one radial direction to be locally anchored in a grouted borehole and is adapted to be harder than the stem portions.
A rock bolt which includes an elongate cylindrical body having a first end and an opposed second end, a threaded portion at the second end for attaching thereto, and locating thereon, a nut and a bearing plate, a mechanical anchor at, or at least partially located on, a first end portion of the body and a first resistive anchor, located between the threaded portion and the mechanical anchor.
Dependencies are inferred from the claim text.