Cable bolt
AssigneeGarford Pty Ltd
InventorNeville Hedrick
Life of this patent
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Abstract
A cable bolt is provided that is suited to stabilize rock surfaces, particularly to withstand loads placed on the cable bolt when tensioned to stabilize rock surfaces of coal mines. The cable bolt comprises a tendon composed of a plurality of strands, the tendon having a plurality of pre-formed bulbous portions. The bulbous portions house rigid elements, such as a ball bearing, which are inserted after the bulbous portions are formed. When the cable bolt is tensioned or stressed, the load placed on the bulbous portion will be resisted by the rigid element housed within the bulbous portion, thereby preventing the bulbous portion from collapsing.
Claims19
A cable bolt comprising a tendon composed of a plurality of strands, the tendon having a plurality of bulbous portions, wherein all the strands in each bulbous portion are spaced apart from one another substantially about the periphery of each bulbous portion, and a plurality of rigid elements, wherein the bulbous portions house the rigid elements, such that there is minimal clearance between an outermost surface of the rigid element and a broadest part of a cavity of the bulbous portion.
A cable bolt when used to stabilize a rock surface against collapse in hard rock mining, the cable bolt comprising a tendon composed of a plurality of strands, the tendons having a plurality of bulbous portions, wherein all the strands in each bulbous portion are spaced apart from one another substantially about the periphery of each bulbous portion, and a plurality of rigid elements, wherein the bulbous portions house the rigid elements.
A cable bolt when used to stabilize a coal face against collapse in coal mining, the cable bolt comprising a tendon composed of a plurality of strands, the tendons having a plurality of bulbous portions, wherein all the strands in each bulbous portion are spaced apart from one another substantially about the periphery of each bulbous portion, and a plurality of rigid elements, wherein the bulbous portions house the rigid elements.
A method of forming a cable bolt including a tendon composed of a plurality of strands, the tendon having a plurality of pre-formed bulbous portions, wherein all the strands in each bulbous portion are spaced apart from one another substantially about the periphery of each bulbous portion forming a cavity, the method comprising the steps of:
- a) prising apart two of the strands of each pre-formed bulbous portion;
- b) inserting a rigid element into the cavity of the pre-formed bulbous portion;
- and
- c) releasing the prised apart strands such that an inherent tension in the prised apart strands encourages the strands to return to the original configuration of the pre-formed bulbous portion.
A cable bolt comprising a tendon composed of a plurality of strands, the tendons having a plurality of pre-formed bulbous portions, wherein all the strands in each pre-formed bulbous portion are spaced apart from one another substantially around the periphery of each pre-formed bulbous portion, and a plurality of rigid elements, wherein the rigid elements are inserted into the pre-formed bulbous portion and housed therein.
A method of forming a cable bolt including a tendon composed of a plurality of strands, the method comprising the steps of:
- a) forming a plurality of bulbous portions within the strands of the tendon, with each bulbous portion including a cavity therein;
- b) prising apart two of the strands of each of the plurality of bulbous portions;
- c) inserting a rigid element into the cavity of each bulbous portion;
- and
- d) releasing the prised apart strands such that an inherent tension in the prised apart strands encourages the strands to return to the original configuration of the bulbous portion, such that each rigid element remains housed within the cavity of each of the plurality of bulbous portions.
Dependencies are inferred from the claim text.