JPH0713390Y2 - Cable detention end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable, in particular, a cable anchoring end used in a slack suppressing overhead power transmission line.

[Technical background of the invention and its problems] Conventionally, as an overhead transmission line, a steel-core aluminum stranded wire having a structure in which aluminum or an aluminum alloy wire is twisted around the outer periphery of a steel-core stranded wire that is a tension member ACSR) is frequently used.

Then, such a cable pulling end part of ACSR exposes the steel core stranded wire by stripping the cable and compresses and fixes this steel core stranded wire with a steel compression clamp having corrugated folds on the outer surface, An aluminum compression clamp is fitted over the steel compression clamp to the aluminum or aluminum alloy stranded wire, and these are integrally compressed and fixed.

However, at the cable retaining end of the ACSR having such a structure, not only is it time-consuming to perform the compression connection between the steel core and the steel clamp, but also when water enters the retaining clamp from the outside, the tension member is There has been a problem that a steel wire such as a galvanized steel wire that constitutes the same is easily corroded.

Furthermore, in recent years, Kevlar (trade name), which has a remarkably small weight and linear expansion coefficient, and FRP with a reinforcing element such as carbon fiber or glass fiber have been used as tension members instead of steel cores to suppress sag especially at high temperatures. Although a slack suppressing type twisted wire has been developed, when a tension member is compressed and connected with a steel clamp in such a twisted wire, the tension member is damaged by the strong compression force and gripped by the steel clamp. There is a problem that the force is greatly reduced, and at present, an effective retracting end portion for such a cable has not yet been devised.

[Object of the Invention] The present invention has been made in order to solve these problems, and is effective for retracting a cable having a tension member made of a wire material in which fibers are bonded with resin, and the operation is simple and cost-effective. The purpose is to provide a cheap cable towed end.

[Summary of the Invention] That is, the cable retracting end of the present invention exposes the tension member by stripping a cable having a tension member made of a wire material formed by joining fibers with a resin.
This exposed tension member is inserted into a hard sleeve with irregularities formed on the inner and outer peripheral surfaces, these are solidified together with a curable resin, and a compression clamp is fitted from the hard sleeve onto the cable. It is characterized by being compressed and fixed from the outside.

Examples of the tension member used in the cable squeezing end portion of the present invention include those made of a wire material such as Kevlar (trade name), FRP having a fiber such as carbon fiber or glass fiber as a reinforcing element.

Among the above FRPs, commercially available products include, for example, CF compose using carbon fiber as a reinforcing element and a heat-resistant epoxy resin as a binder, and Kevlar compose using Kevlar fiber as a reinforcing element and unsaturated polyester resin as a binder (whichever Also manufactured by Tokyo Steel Co., Ltd., etc.

[Embodiment of the Invention] An embodiment of the present invention shown in the drawings will be described below.

The drawing is a vertical cross-sectional view showing an essential part of an embodiment of the present invention.

In this figure, reference numeral 1 indicates an overhead power transmission line, and this overhead power transmission line 1 is formed by twisting a plurality of aluminum strands 3 around the outer periphery of a tension member 2 formed by twisting a plurality of CF composes. There is.

In this overhead power transmission line 1, the aluminum stranded wire 3 is cut off at its end to expose the tension member 2, and the exposed portion of the tension member 2 is a spiral or ring shape formed by compression molding on the inner and outer circumferences of the anchorage side. Fold 4
It is inserted in the insertion hole of the steel clamp 5 having.

A curable resin 6 such as an epoxy resin is filled and solidified between the tension member 2 and the steel clamp 5, and the steel clamp 5 and the tension member 2 are integrally fixed via the curable resin 6. ing.

Further, an eye-shaped aluminum clamp 7 is fitted and compression-fixed on the outer side of the steel clamp 5 connected and fixed to the tension member 2 in this manner, straddling the end of the aluminum stranded wire 3. .

Then, the steel clamp 5 and the tension member 2 are integrally cured by the curable resin 6, and the inner surface of the aluminum clamp 7 is connected to the stranded aluminum wire 3 by compression, and the sectional waveform of the steel clamp 5 is also formed. By digging into the valley portion of the fold 4, the tension member 2 and the aluminum clamp 7 are firmly connected via the curable resin 6 and the steel clamp 5. In the figure, reference numeral 8 indicates a hang ear.

In the cable retracting end portion of this embodiment configured as described above, due to the anchor effect of the pleats 4 on the inner surface of the steel clamp 5, the tension member 2 has the resin of the hardening element and the hardening resin 6 integrated with each other. Therefore, the steel clamp 5 and the tension member 2 are firmly joined to each other. Since the work of compressing the steel clamp 5 is not required, the working time can be shortened, the labor can be saved, and the cost can be reduced. Further, although the aluminum clamp 7 compresses, its force is indirectly applied to the tension member 2 via the steel clamp 5 and the curable resin 6, so that the tension member 2 may not be damaged by it. It is extremely small, and there is no risk of a reduction in gripping force. Sufficient connection strength can be obtained.

Further, since the tension member 2 of the overhead stranded wire 1 is made of non-metal, even if water enters the clamp from the outside, the tension member 2 will not be corroded.

Therefore, unlike the conventional ACSR, it is not necessary to inject the rust preventive mixture into the steel core, and the cost can be reduced accordingly.

In the above embodiments, an example in which the present invention is applied to an eye-type detention clamp has been described, but the present invention is not limited to such an embodiment, and it can be applied to a gold wheel passing type detention clamp or a straight sleeve. Can be similarly applied.

[Effects of the Invention] As is clear from the above description, in the cable squeezing end portion of the present invention, the cable having the tension member made of the wire material in which the fibers are bonded with resin is stripped off to expose the tension member. Since the exposed tension member is inserted into a hard sleeve having irregularities formed on the inner peripheral surface and the outer peripheral surface and integrally solidified with a curable resin, these are compressed and fixed by a compression clamp from the outside. The cable having the above-mentioned tension member can be securely held with a large gripping force, and further, the working time can be shortened, the labor can be saved, and the cost can be reduced.

[Brief description of drawings]

 The drawings are cross-sectional views of the essential portions of an embodiment of the present invention. 2 ... Tension member 3 ... Aluminum stranded wire 4 ... Fold 5 ... Steel clamp 6 ... Curable resin 7 ... Aluminum clamp

Claims (3)

[Scope of utility model registration request] 1. A cable having a tension member made of a wire material formed by binding fibers with a resin is stepped off to expose the tension member, and the exposed tension member is provided with irregularities on an inner peripheral surface and an outer peripheral surface. Inserted into a hard sleeve that has been hardened, and these are solidified together with a curable resin, and a compression clamp is fitted from the hard sleeve onto the cable, and compressed and fixed from the outside thereof. Department. 2. The cable retracting end portion according to claim 1, wherein the cable is a stranded wire of aluminum or aluminum alloy. 3. The cable retracting end portion according to claim 1 or 2, wherein the hard sleeve is a steel sleeve.