Rock anchor bolt
AssigneeCape Town Iron and Steel Works (PTY) Limited
InventorKenneth Douglas Kynoch
Life of this patent
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Abstract
A rock anchor bolt (18) comprising an elongated rod (10, 12, 14, 16, 18) which is provided over its outer surface with at least one (11), two (13), three, (17) or four (15) axially extending grooves. The rod (10, 12, 14, 16, 18), is preferably twisted over its length and provided over one of its ends (22) with screw threads (23) in order to receive a cooperating nut (25).
Claims11
A rock anchor bolt adapted for use with a settable material which is provided in a preformed hole, said bolt comprising an elongated metal rod which in transverse cross section defines a circle and which is provided over the outer surface with at least one axially extending groove formed therein, the groove providing an extended surface area for cooperating with the settable material in the preformed hole, at least part of the rod bearing the groove being twisted about its longitudinal axis, said outer surface of the elongated rod including at least one circumferential outer section having a curvature corresponding to that of said circle, whereby the insertion of said elongated rod into said preformed hole facilitates the mixing of the settable material in said preformed hole.
A rock anchor bolt adapted for use with a settable material which is provided in a preformed hole, said bolt comprising an elongated metal rod which in transverse cross section defines a circle and which is provided over its outer surface with four axially extending grooves formed therein, which are arranged symmetrically about the rod, and which extend over the entire length of the rod, the rod being twisted about its longitudinal axis over its entire length, the grooves providing an extended surface area for cooperating with the settable material in the preformed hole, and the outer surface including circumferential outer sections, each having a curvature corresponding to that of said circle, whereby the insertion of the elongated rod into said preformed hole facilitates the mixing of the settable material in said preformed hole.
Dependencies are inferred from the claim text.