JPH07250418A - Anchor end part for stranded wire - Google Patents

Abstract

PURPOSE:To provide an end part for anchoring a stranded wire, having a tension member principally composed of carbon fiber, with sufficient tensile strength and high workability. CONSTITUTION:A stranded wire 6 is stripped stepwise at the end part thereof to expose a tension member 7 which is then inserted into a slit forming part 13 of a steel clamp 9 having four slits in the longitudinal direction. An aluminum or aluminum alloy sleeve 14 is then applied thereto including the strand layer 8 of a metal wire for conduction and compressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a towed end of a twisted wire, and more particularly to a towed end of a twisted wire having a tension member mainly composed of carbon fiber used in a sag suppressing overhead transmission line. Regarding the department.

[0002]

2. Description of the Related Art In recent years, a slack suppressing type twisted electric wire which suppresses slack particularly at high temperature has been developed by using a wire member which is made of a lightweight carbon fiber having a small coefficient of thermal expansion and reinforced with resin as a tension member. ,Attention has been paid.

However, in such a twisted electric wire, a steel sleeve is placed on the tension member when the wire is held in the tension clamp, as in the case of a conventional twisted electric wire using a steel core twisted wire as a tension member. When directly compressed and connected, the resin-bonded carbon fiber is damaged by the strong compressive force of the steel sleeve, causing crushing and cracking,
There is a problem in that the gripping force of the steel sleeve is greatly reduced and sufficient tensile strength cannot be obtained.

Therefore, in order to eliminate such inconvenience, a compression connection portion of a stranded electric wire as shown in FIGS. 5 and 6 has been proposed.

That is, in the compression connection portion shown in FIGS. 5 and 6, aluminum or aluminum is formed around the center wire 1 formed by twisting strands of a hard steel wire and a carbon fiber compounded with resin. A twisted electric wire provided with a twisted layer 2 of a conductive metal wire such as an aluminum alloy wire is stripped off and the center layer 1 is exposed. A metal buffer layer 3 such as an aluminum sleeve is provided on the exposed center layer 1, and a steel sleeve 5 integrally extended from a strain clamp 4 is fitted and compression-fixed on the outside thereof. .

In any case, since the compressive force when compressing the steel sleeve 5 is buffered by the metal buffer layer 3 and the surface pressure applied to the center layer 1 is reduced, the center layer 1 is not crushed or cracked. Therefore, the steel sleeve 5 exerts a sufficient gripping force, and the entire connecting portion exhibits a predetermined high tensile strength.

[0007]

However, in the compression connection portion having such a structure, since the metal buffer layer 3 must be provided on the central layer 1, it takes time and labor, and the workability is improved. There was room.

The present invention has been made in consideration of such a point, and a twisted wire having a tension member mainly composed of carbon fiber can be retained with good workability and sufficient tensile strength. The purpose of the present invention is to provide a retracted end of a combined electric wire.

[0009]

DISCLOSURE OF THE INVENTION The present invention relates to a retracted end portion of a twisted electric wire formed by twisting a conductive metal wire around a tension member mainly composed of carbon fiber,
The tension member exposed by stripping off the end portion of the twisted electric wire is inserted into a hard sleeve having a plurality of slit-shaped notches in the length direction, and the conductive metal of the twisted electric wire is provided outside thereof. It is characterized in that a metal sleeve is fitted over the line and compressed and fixed.

In the present invention, a greater effect can be obtained particularly when the twisted electric wire is a twisted electric wire in which the tension member is made of resin-reinforced carbon fiber in which carbon fibers are joined with resin. .

Further, in the present invention, the compression shape of the metal sleeve is a substantially regular hexagonal shape, and in that case, the compression force acts uniformly on the hard sleeve in the central direction,
Moreover, in order to maintain the strength of the hard sleeve, the four slit-shaped notches of the hard sleeve are at positions corresponding to the compression surface of the metal sleeve, and the adjacent slit-shaped notches are almost circumferentially formed. It is desirable that they are arranged at the intervals of 60 degrees and approximately 120 degrees.

Further, as the hard sleeve of the present invention,
A steel sleeve is preferable from the viewpoint of strength, and as a metal sleeve that is fitted and compressed and fixed on the outer side of the sleeve, when the conductive metal wire of the twisted electric wire is aluminum or aluminum alloy wire, electrolytic corrosion is prevented. From the viewpoint of prevention, it is desirable to use a sleeve made of aluminum or aluminum alloy.

[0013]

In the retracted end portion of the twisted wire of the present invention, the tension member exposed after being stepped off is inserted into the hard sleeve in which a plurality of slit-shaped notches in the length direction are formed, and the outside Since the metal sleeve is fitted and compression-fixed to the metal sleeve, the compression force when compressing the metal sleeve acts on the hard sleeve to close the slit-shaped notch, and as a result, the compression force is absorbed or relaxed. The force applied to the tension member is greatly reduced. Therefore, the carbon fiber forming the tension member is not broken or crushed, and the metal sleeve exerts a sufficient gripping force, so that it has a high tensile strength as a whole.

In addition, in forming, since the hard sleeve having the slit-shaped notch is not directly compressed but can be connected and fixed by compressing only the outer metal sleeve, only one compression work is required. Since the carbon fiber is not damaged even if the metal buffer layer is not provided unlike the conventional case, the working time can be shortened and the labor can be saved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a retracted end portion of a twisted electric wire according to the present invention.

In the figure, reference numeral 6 denotes an aluminum or aluminum alloy wire around the outer circumference of a tension member 7 formed by twisting a plurality of resin-reinforced carbon fibers obtained by bonding carbon fibers with a resin such as heat-resistant epoxy resin. 3 shows a stranded electric wire provided with a stranded layer 8 of a conductive metal wire, the end of which is stripped off and the tension member 7 is exposed. Then, the exposed tension member 7 is inserted into an eye-shaped steel clamp 9 having a slit-shaped notch as shown below. That is, as shown in FIGS. 2 and 3, the steel clamp 9 is provided with a spiral or ring-shaped concavo-convex portion 11 on the outer periphery of the central portion which is connected to the eye-shaped end portion 10, and at the end on the pulling side. Four slit-shaped notches 12 are formed in the lengthwise direction, and the tension member 7 is inserted into the slit forming portions 13. Here, in the steel clamp 9, four slit-shaped notches 1
The positions of the two slits are preferably equal to 60 ° and 120 ° in the circumferential direction, rather than being equidistantly arranged in the circumferential direction, that is, at intervals of 90 °.

Further, an aluminum or aluminum alloy sleeve 14 is fitted over the twisted layer 8 of the conductive metal wire on the outside of the tension member 7 fitted with the steel clamp 9 as described above. It is fixed by being compressed into a regular hexagonal shape from the outside.

The formation of such a towed end is performed by the following procedure. First, the end portion of the twisted electric wire 6 is stripped off to expose the tension member 7 made of a resin-reinforced carbon fiber, the exposed portion is inserted into the slit forming portion 13 of the steel clamp 9, and then the aluminum is provided outside the slit forming portion 13. Alternatively, the aluminum alloy sleeve 14 is fitted. Then
This aluminum or aluminum alloy sleeve 1
4 is compressed into a regular hexagonal shape from the outside, and the aluminum or aluminum alloy sleeve 14 is fixed on the steel clamp 9 and the twisted electric wire 6.

At the towed end of the twisted wire thus formed, four lengthwise slits are formed on the outer periphery of the tension member 7 exposed by stripping off the end of the twisted wire 6. The steel clamp 9 in which the portion 12 is formed is fitted, and the aluminum or aluminum alloy sleeve 14 is fitted and compressed and fixed on the outer side thereof. Therefore, the aluminum or aluminum alloy sleeve 1
The compressive force at the time of compressing 4 is the notch 1 of the steel clamp 9.
By closing 2 the absorption is relaxed and the force applied to the tension member 7 is greatly reduced. In particular, as shown in FIG. 3, the four slit-shaped notches 12 are made of aluminum or aluminum when the adjacent slit-shaped notches 12 are provided at positions of 60 degrees and 120 degrees in the circumferential direction. By arranging the slit-shaped notch 12 at a position corresponding to the compression surface with respect to the alloy sleeve 14, the compressive force acts uniformly on the slit forming portion 13 of the steel clamp 9 in the central direction, so that each slit The notches 12 are uniformly closed to absorb and relax the compression force most effectively.
Therefore, the resin-reinforced carbon fiber forming the tension member 7 is not damaged, and the aluminum or aluminum alloy sleeve 14 exerts sufficient gripping force. In particular, as described above, the steel clamp 9 is used.
When the unevenness 11 is provided on the surface, a stronger gripping force can be obtained, so that it has a high tensile strength as a whole, and by using this, highly reliable detention can be performed.

Further, since the steel clamp 9 is not directly compressed and is fixed by compressing only the outer aluminum or aluminum alloy sleeve 14, only one compression work is required, and the work time is shortened. And labor saving can be achieved. In the above embodiment, the example in which the slit member 13 of the steel clamp 9 is directly fitted on the tension member 7 has been described, but the present invention is not limited to such an embodiment and is suitable. The steel clamp 9 may be fitted through such a buffer layer, and although the workability is slightly lowered, a towed end portion having high tensile strength can be obtained. Examples of the buffer layer include those formed by winding a non-woven fabric around the tension member 7 or die-casting a metal such as zinc. Further, although the above-mentioned embodiment is an example in which the present invention is applied to a twisted electric wire having a tension member 7 in which a plurality of resin-reinforced carbon fibers are twisted, a tension member made of only carbon fiber or a carbon fiber It can be similarly applied to a stranded electric wire having a tension member formed by compounding a hard steel wire with a resin. Further, the present invention is not limited to the eye type retention clamp used in the above-described embodiment, but can be applied to a passing wheel type retention clamp and a straight sleeve.

[0022]

As described above, in the twisted wire detention end portion of the present invention, a plurality of lengthwise slit-like cutouts are formed on the tension member exposed by stripping the step. Since the sleeve is fitted and the metal sleeve is fitted to the outside and fixed by compression, the compressive force when compressing the metal sleeve is absorbed and relaxed, and the force applied to the tension member is reduced.

Therefore, the carbon fiber forming the tension member is not damaged and the metal sleeve exerts a sufficient gripping force, so that it has a high tensile strength as a whole. Moreover, only one compression operation is required for forming the carbon fiber, and since the carbon fiber is not damaged without providing a metal buffer layer as in the conventional case, work time can be shortened and labor can be saved. Can be planned.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a twisted wire retracting end portion of the present invention.

FIG. 2 is a front view showing a steel clamp used in the embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a transverse cross-sectional view showing a compressed state of the steel clamp when the aluminum or aluminum alloy sleeve is compressed in the embodiment.

FIG. 5 is a vertical cross-sectional view showing an example of a drawn end portion of a conventional twisted electric wire.

FIG. 6 is a vertical cross-sectional view showing another example of the drawn end portion of the conventional twisted electric wire.

[Explanation of symbols]

6 ………… Twisted electric wire 7 ………… Tension member 8 ………… Twisted layer of conductive metal wire 9 ………… Steel clamp 12 ………… Slit notch 14 ………… Aluminum or aluminum alloy sleeve

Front Page Continuation (71) Applicant 000002255 Showa Densen Electric Co., Ltd. 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture (72) Inventor Shuji Tachisaki 7-2-1 Nakayama, Aoba-ku, Sendai City, Miyagi Prefecture Tohoku Electric Power Technology Research Institute (72) Inventor Shigeru Tosaka 3-7-1, Ichibancho, Aoba-ku, Sendai-shi, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor, Yasue Sato, Aoba-ku, Sendai-shi, Miyagi 3-7-1, Machi Tohoku Electric Power Co., Inc. (72) Inventor Hiroshi Kimura 5707 Shishikura, Dejima-mura, Shinji-gun, Ibaraki Tokyo Research Institute Co., Ltd. (72) Inventor Hiroshi Tajima Minami-Shinagawa, Shinagawa-ku, Tokyo 5-19 No. 19 Sanwa Techchi Co., Ltd. (72) Inventor Haruki Usuda 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Electric Cable Co., Ltd. (72) Inventor Masakazu Kojima Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Sakae Oda 2-1-1 No. 1 Showa Electric Wire & Cable Co., Ltd.

Claims (5)

[Claims] 1. An end portion of a twisted electric wire is stripped and exposed at a retracted end portion of a twisted electric wire formed by twisting conductive metal wires around a tension member mainly composed of carbon fiber. The tension member is inserted into a hard sleeve having a plurality of slit-shaped notches in the lengthwise direction, and the outer side of the tension member is fitted onto the conductive metal wire of the twisted electric wire and the metal sleeve is fitted and compressed. Storing end of the characteristic twisted wire. 2. The retracted end portion of a stranded electric wire according to claim 1, wherein the tension member is made of resin-reinforced carbon fiber obtained by bonding carbon fibers with resin. 3. The cross section of the metal sleeve is compressed into a substantially hexagonal shape, and the slit-shaped notch portion of the hard sleeve is
Four of them are positions corresponding to the compression surface of the metal sleeve, and the adjacent slit-shaped notches are arranged at positions at intervals of approximately 60 degrees and approximately 120 degrees in the circumferential direction. The twisted wire retracting end portion according to claim 1 or 2. 4. The towed end of the twisted wire according to claim 1, wherein the hard sleeve is a steel sleeve. 5. The retracted end portion of the twisted wire according to claim 1, wherein the conductive metal wire and the metal sleeve of the twisted wire are made of aluminum or an aluminum alloy.