Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1996-05-01
1998-08-11
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
4052591, 4053022, E21D 2002
Patent
active
057918244
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national stage of PCT/EP 94/03730 filed 11 Nov. 1994 and based, in turn, on German National application G 93 17 336.9 filed 12 Nov. 1993 under the International Convention.
FIELD OF THE INVENTION
The invention relates to an injection cable bolt, particularly for mining, tunnelling and embankment construction, as well as for securing rock faces. More particularly, the invention relates to a cable bolt which basically consists of a cable made for instance of heavy duty synthetic or natural textile yarns having a high-pressure hose as a core, surrounded by a net-like support mesh, and which can be provided with a securing element and a sealing element formed by two segments which can be fit one over the other via conically shaped annular surfaces, as well as with a connection element outside the bore which is arranged in a sleeve surrounding the cable.
BACKGROUND OF THE INVENTION
A cable bolt of the type with which the invention is concerned is described in greater detail in German Patent 40 18 703. Such an injection cable bolt has the advantage of an adjusted bendability and consequently can be introduced into narrow, hollow spaces. Furthermore an additional advantage is that such bolts can have greater lengths and can be operated in an extremely simple and safe manner and can more easily be transported.
A drawback of these injection cable bolts is that the is bolt has a core surrounded by the cable and the cable is surrounded by a support grid, which is surrounded by a protective jacket of synthetic material.
It has been found that during injection the protective jacket makes sure that the injection material inside the jacket produces an intimate cementing in the cable, but that the delivery of the injection material over the entire length of the injection cable bolt is not possible to the desired extent. The protective jacket is an impediment for optimal injection. The support grid is tightly embedded in the cement closely to the cable within the jacket, but due to the lack of the widening possibility does not constitute an additional, independently supporting bracing element.
A further disadvantage of the injection cable bolt of the patent is that the connections of securing and connection elements at the opposite cable ends are very complicated and are not attuned to the traction forces to be transmitted through the cable. Also the sealing element provided for sealing the bore, which consists of two superimposable wedge elements, is in need of improvement, as shown by practice, since no active sealing of the two elements is insured solely due to their sliding on top of each other as a result of the pressure medium.
OBJECT OF THE INVENTION
It is therefore, it object of the invention to provide an injection cable bolt for mining, tunnelling and embankment construction, as well as for securing rock faces, which by avoiding the drawbacks of the art, can be used as a simple injection cable bolt, as well as an expandable bolt which makes an optimal injection possible and which can be produced in a simple and cost-effective manner.
SUMMARY OF THE INVENTION
This object is attained according to the invention in an injection cable bolt wherein the securing element is connected with the cable end by means of a shrinking hose. The segments of the sealing element are each constructed of two half-shells which can fit together, whereby the segment facing the bore opening is cylindrically shaped on the inside over its entire length, while the segment which is slid over it is cylindrically shaped on the outside, and the segment which is slid over has on the inside two conically shaped widened areas, pointing in opposite directions away from the cable. The that the sleeve, which can be rigidly connected with the cable end through the shrinking hose or by cementing, surrounds the connection element at least partially, and the connection element has a tube which can be inserted in the core. Alternatively a double-layered or multilayered securing elem
REFERENCES:
patent: 3494234 (1970-02-01), Jorge
patent: 4247223 (1981-01-01), Amakasu et al.
patent: 4664555 (1987-05-01), Herbst
patent: 4790129 (1988-12-01), Hutchins
patent: 4859118 (1989-08-01), Schaeffer
patent: 5586839 (1996-12-01), Gillespie
Dubno Herbert
Taylor Dennis L.
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