Rock anchor assembly
First Claim
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1. A rock anchor which includesa multi-strand cable;
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Abstract
A rock anchor includes an elongate element. A transverse dimension of a portion of the elongate element is enlarged. The transverse dimension is reducible on the application of a suitable force applied to the enlarged portion. The invention extends to a tensioning device for use with the rock anchor and to a yielding anchor assembly which includes the rock anchor and the tensioning device.
33 Citations
10 Claims
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1. A rock anchor which includes
a multi-strand cable; - and
a sleeve of a yielding material received over a part of at least one strand of the cable with other strands surrounding the sleeve radially to enlarge a transverse dimension of a portion of the cable, the transverse dimension being reducible on the application of a suitable force applied to the sleeve. - View Dependent Claims (2, 3)
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4. A tensioning device for use with a rock anchor, the device including
a jaw assembly having a plurality of discrete jaws which define a passage through which a cable of the rock anchor can pass, the jaws each having a tapered outer surface; -
a clamping means for urging the jaws into gripping relationship with the cable, the clamping means defining a tapered seat which is complementary to the tapered outer surfaces of the jaws; a tensioning member carried on the clamping means for effecting tensioning of the cable; and an adjustment means, arranged on the clamping means, for adjusting the position of the jaw assembly relative to the tapered seat thereby to adjust a transverse dimension of the passage. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A yielding anchor assembly which includes
an elongate element; -
an enlarging means carried on at least a portion of the elongate element for enlarging a transverse dimension of said portion of the elongate element, said transverse dimension being reducible on the application of a suitable force applied to the enlarging means; and a tensioning device for tensioning the elongate element, the tensioning device defining a passage through which the elongate element slips when said suitable tension is exceeded, the passage being dimensioned so that when the tension is exceeded, the suitable force is applied to the enlarging means to reduce the transverse dimension and to permit the portion to be drawn through the passage.
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Specification