JP2009219321A - Horizontal branched spacer and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal branch spacer of which both ends are not required to be grounded. <P>SOLUTION: The horizontal branch spacer 10 mounted between messenger wires in order to support an electric wire horizontally branched has a surface made of an insulating material 22, and includes: a spacer body 20 formed by installing an iron core 21 extending in the axial direction inside thereof; and a pair of gripping fittings 30 which are mounted at both ends of the spacer body 20 so as to be electrically conductive to the iron core 21, and to which the messenger wires are connected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a horizontal branch spacer for supporting a wire branched horizontally from a wire spanned between poles of a utility pole, and a method for manufacturing the horizontal branch spacer.

  Conventionally, as shown in FIG. 9, when branching the electric wire 1 spanned between the utility poles 2, both ends are suspended by messenger wires 11 made of galvanized steel wire, The electric wire 3 branched by the horizontal branch spacer 110 installed between them is supported.

FIG. 10 is a view showing a configuration of a conventionally used horizontal branch spacer 110, and FIG. 11 is an enlarged view showing an end portion of the horizontal branch spacer 110. As shown in FIG. As shown in FIGS. 10 and 11, a conventional horizontal branch spacer 110 is used to hold a rod-shaped member 120 made of FRP (fiber reinforced plastic) and an electric wire 3 attached to the rod-shaped member 120 at an appropriate interval. It is comprised from the bobbin 123 and the holding | grip metal fitting 130 attached to the both ends of the rod-shaped member 120 (for example, refer patent document 1 and 2).
JP 2003-32863 A JP 2000-278846 A

  By the way, when the electric wire 1 is damaged due to an accident or the like, electricity may flow through the messenger wire 11 that supports the horizontal branch spacer 110, so the messenger wire 11 must also be grounded. Since the horizontal branch spacer 110 is made of FRP in which the rod-shaped member 120 is an insulator, the gripping metal fittings 130 attached to both ends thereof are not electrically connected. As shown in FIG. It is necessary to ground 12 to the wire 11, which requires time and labor for grounding work.

  The present invention has been made in view of the above problems, and an object of the present invention is to ground only one of the messenger wires among the messenger wires that support the horizontal branch spacer.

  The horizontal branching spacer of the present invention is a horizontal branching spacer that is attached between messenger wires to support a horizontal branching electric wire, and has a bar-like conductive material that has a surface made of a nonconductive material and extends in the axial direction. And a pair of gripping fittings attached to both ends of the spacer body so as to be electrically connected to the conductive material and connected to the messenger wire. .

In the horizontal branch spacer, the insulating material may be made of a fiber reinforced resin.
Further, the rod-shaped conductive material may be an iron rod, and the core member protrudes from both ends of the spacer body, and the gripping bracket grips the protruding portion of the core member. May be.
Further, the protruding portion of the core member and the gripping metal fitting may be provided with screw portions that are screwed together.

  Further, the horizontal branch spacer manufacturing method of the present invention is the above-described horizontal branch spacer manufacturing method, wherein a cylindrical member made of the fiber reinforced resin is manufactured by a pultrusion molding method, and the cylindrical member is formed inside the cylindrical member. An iron bar is inserted, and the pair of gripping metal fittings are attached so as to be electrically connected to both ends of the iron bar.

  According to the present invention, since the gripping hardware to which the messenger wire is connected is attached so as to be electrically connected to both ends of the core of the spacer body, if one messenger wire is grounded, the other messenger wire Can be grounded, and the cost for grounding work can be reduced.

Hereinafter, an embodiment of the horizontal branch spacer of the present embodiment will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing the configuration of the horizontal branch spacer 10 of the present embodiment, and FIG. 2 is a cross-sectional view showing the configuration of the end of the horizontal branch spacer 10 of the present embodiment. FIG. 2 shows only one end portion, but the other end portion has the same configuration. As shown in FIGS. 1 and 2, the horizontal branch spacer 10 of the present embodiment includes a spacer body 20 including an iron core 21 extending in the axial direction and a cylindrical insulating material 22 surrounding the iron core 21. And gripping metal fittings 30 attached to both ends of the spacer body 20. The gripping metal 30 is galvanized on the surface to prevent corrosion.

The insulating material 22 is made of, for example, FRP (fiber reinforced plastic) in which glass fibers are mixed in an epoxy resin, and has high insulation properties and excellent rigidity. In order to protect the insulating material 22, for example, a coating 24 made of silicone rubber is applied to the outer peripheral surface of the insulating material 22.
The iron core 21 has such a length that ends thereof protrude from both ends of the spacer body 20, and a thread 21 </ b> A is formed in a portion protruding from the end of the spacer body 20. In addition, a hole 31 having a thread 30 </ b> A on the inner peripheral surface is formed at the end of the gripping metal 30 on the side connected to the spacer body 20. The gripping metal fitting 30 is connected to the iron core 21 by being crimped from the outer peripheral side in a state where the screw threads 30A formed in the hole 31 and the screw threads 21A at both ends of the iron core 21 are screwed together. Thereby, the connection intensity | strength of the holding | grip metal fitting 30 and the iron core 21 is improving.

  FIG. 3 is a diagram illustrating a state in which the electric wire 3 branched by the horizontal branch spacer 10 of the present embodiment is supported. As shown in the figure, the horizontal branching spacer 10 is supported by connecting the holding metal fittings 30 at both ends thereof to the messenger wire 11 extending from the utility pole. The electric wire 3 branched from the electric wire 1 spanned between the utility poles 2 is supported from below by the bobbin 23 of the horizontal branch spacer 10. A ground electrode 12 is connected to the messenger wire 11 extending from the holding fitting 30 at one end of the horizontal branch spacer 10. According to the horizontal branch spacer 10 of the present embodiment, since the holding fittings 30 attached to both ends by the iron core 21 are electrically connected to each other, the horizontal branch spacer can be obtained simply by connecting the ground electrode 12 to one messenger wire 11. The messenger wires 11 attached to the both ends of 10 can be grounded.

Hereinafter, the manufacturing method of said horizontal branch spacer 10 is demonstrated.
FIG. 4 is a diagram illustrating a process of manufacturing the cylindrical insulating material 22 constituting the spacer body 20. In this embodiment, the pultrusion method described below is adopted as a method for hollow-molding FRP in order to manufacture the insulating material 22.

  First, as shown in FIG. 4, the glass fiber 50 fed out from the bobbin 40 on which the glass fiber is wound is immersed in a liquid epoxy resin 51. The glass fiber 50 is cooled as described later, and is fed out from the bobbin 42 by feeding the end portion of the cured FRP 53 by the feed roll 42.

  Next, as shown in FIG. 5, the glass fiber 50 infiltrated with the epoxy resin 51 is passed through a die 41 and molded. A circular hole 41A is formed in the die 41, and a molding die 43 is disposed at the center of the hole 41A. The glass fiber 50 into which the epoxy resin 51 has permeated is formed into a cylindrical shape by passing through the circular hole 41A. The die 41 is heated to a high temperature, and the epoxy resin 51 is cured in a state of being formed into a cylindrical shape. Even after passing through the die 41, the epoxy resin 51 is heated, gelled, and cured to produce a cylindrical FRP 53. And the insulating material 22 can be manufactured by cut | disconnecting FRP53 for every predetermined length.

  Next, inside the insulating material 22 manufactured as described above, the iron core 21 having the thread 21 </ b> A formed at both ends is provided, and the portions where the screws 30 </ b> A at both ends are formed are both end surfaces of the insulating material 22. Insert so that it protrudes from.

Next, a primer is applied to the surface of the insulating material 22, and the applied primer is dried.
Next, the bobbin 23 is attached to the surface of the insulating material 22 with a predetermined interval.
Next, silicone rubber 24 is coated on the outer peripheral surface of the insulating material 22. At this time, if there is a gap between the insulating material 22 and the iron core 21, the silicone rubber 24 enters the gap, so the insulating material 22 and the iron core 21 are integrated.

Next, the screw 21 </ b> A formed at both ends of the iron core 21 and the screw 30 </ b> A formed in the hole 31 of the gripping metal 30 are screwed together, and the gripping metal 30 is attached to both ends of the iron core 21. . And it clamps from the outer peripheral side of the holding | grip metal fitting 30, and the rotation prevention of the holding | grip metal fitting 30 and the iron core 21 is performed. At this time, if the hollow FRP insulator 22 is pressure-bonded from the outside, the FRP may be damaged. In the present embodiment, as described above, the iron core 21 is protruded from both ends of the insulator 22, Since the holding metal fitting 30 is attached to the protruding portion and the holding metal fitting 30 is pressure-bonded, it is possible to prevent the FRP from being damaged.
The horizontal branch spacer 10 of this embodiment can be manufactured by the above process.

  Here, since it confirmed by experiment that the horizontal branching spacer 10 of this embodiment was equipped with sufficient performance, it demonstrates below. In this experiment, an S45C member having a diameter of 14 mm was used as the iron core 21, an FRP member formed in a cylindrical shape having an outer diameter of 28 mm and an inner diameter of 15.1 mm was used as the insulating material 22, and a SS400 hardware was used as the holding metal fitting 30. The horizontal branch spacer 10 was manufactured using this, and the following test items were examined using the horizontal branch spacer 10 as a test body. FIG. 6 is a table showing the test items examined. As shown in the figure, for electrical performance, AC water injection withstand voltage, lightning impulse withstand voltage, artificial fouling experiment (in equivalent fog), artificial fouling experiment (leakage current), and steep wave voltage test, and mechanical performance, Tensile load resistance, tensile failure load, bending load resistance, bending failure load, and vibration fatigue test were performed. The test methods are AC water injection withstand voltage, lightning impulse withstand voltage, tensile load withstand, and tensile breakdown load with JIS C3801, artificial fouling test (in equivalent fog) with JEC 0201, and artificial fouling test (leakage current). Were tested in accordance with IEC 61109 for power standard and steep wave voltage test.

FIG. 7 is a table showing test results. As shown in the figure, it was confirmed that the prepared test specimen had electrical performance and mechanical performance required as a horizontal branch spacer.
In particular, in the horizontal branch spacer 10 of the present embodiment, since the iron core 21 is penetrated inside, there is a risk that the insulation performance may be impaired. It was confirmed that sufficient insulation performance was secured.

  According to the horizontal branching spacer 10 of the present embodiment described above, the iron core 21 penetrates the spacer body 20, and the gripping metal fittings 30 at both ends are conducted by the iron core 21, so that only the grounding metal fitting 30 on one side is grounded. Thus, the messenger wire 11 connected to both ends can be grounded.

  Further, the thread 21A is formed at both ends of the iron core 21, and the hole 31 having the thread 30A formed in the inner periphery is provided in the gripping metal 30, and these threads are screwed together. And the iron core 21 are pressure-bonded to each other, so that the holding fitting 30 and the iron core 21 are firmly connected.

  Further, since the end portion of the iron core 21 is protruded from the spacer body 20 and the protruding portion is held by the gripping metal fitting 30, it is possible to prevent the insulating material 22 from being damaged when the gripping metal fitting 30 is crimped. .

  Further, the FRP can be easily formed into a cylindrical shape by using a pultrusion method when manufacturing the insulating material 22.

  In the above-described embodiment, the screw 21A is provided at both ends of the iron core 21, and the hole 31 in which the screw 30A is formed on the inner peripheral surface is provided in the gripping metal 30, and these screws 21A and 30A are attached. These iron cores 21 and the gripping metal fittings 30 are connected by screwing and further pressing the gripping metal fittings 30 to the iron cores 21, but the connection method between the gripping metal fittings and the iron cores is limited to this. Absent. FIG. 8 is a diagram illustrating another method of connecting the iron core 21 and the holding metal fitting 60. In the method shown in the figure, a hole 60 </ b> A through which the iron core 21 can penetrate is provided in the gripping metal 30, the iron core 21 is passed through the hole 60 </ b> A, and the gripping metal 30 and the iron core 21 are welded. Also by such a method, the holding metal fitting 60 and the iron core 21 can be electrically connected and can be firmly connected.

  Moreover, in this embodiment, although the thread 21A and 30A screwed together is provided in the iron core 21 and the holding metal fitting 30, if the iron core 21 and the holding metal fitting 30 can be connected firmly, it will be. It is not always necessary to provide a thread.

  In the present embodiment, the iron core 21 is used for the spacer body 20 in order to electrically connect the both ends of the horizontal branch spacer 10. However, the present invention is not limited to this. Any material having rigidity can be used. In this embodiment, an epoxy resin mixed with glass fibers is used as the insulating material. However, the present invention is not limited to this, and any material having insulating properties and predetermined strength can be used.

It is a figure which shows the horizontal branch spacer of this embodiment. It is a figure which shows the edge part of the horizontal branch spacer of this embodiment. It is a figure which shows the state in which the horizontal branch spacer of this embodiment was attached. It is a figure for demonstrating the method of forming FRP in cylindrical shape. It is a figure which shows the structure of the dice | dies which shape | mold FRP into a cylindrical shape. It is a table | surface which shows the test item of the test done using the horizontal branch spacer of this embodiment as a test body. It is a table | surface which shows the test result of the test done using the horizontal branch spacer of this embodiment as a test body. It is a figure which shows another connection method of a spacer main body and a holding metal fitting. It is a figure which shows the state in which the conventional horizontal branch spacer was attached. It is a figure which shows the horizontal branch spacer used conventionally. It is a figure which shows the edge part of the horizontal branch spacer used conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric wire 2 Electric pole 3 (Branched) electric wire 10 Horizontal branch spacer 20 Spacer main body 21 Iron core 21A Screw 22 Insulation material 23 Bobbin 24 Cover 30, 60 Grip 30A Screw 31 Hole 40 Bobbin 41 Die 42 Feeding roll 43 Molding Base 50 Glass Fiber 51 Epoxy Resin

Claims (6)

A horizontal branch spacer attached between messenger wires to support horizontally branching wires,
A spacer body, the surface of which is made of a non-conductive material, and a rod-shaped conductive material extending in the axial direction is provided inside;
A horizontal branching spacer comprising: a pair of gripping fittings attached to both ends of the spacer body so as to be electrically connected to the conductive material and connected to the messenger wire. The horizontal branch spacer according to claim 1,
The horizontal branch spacer, wherein the non-conductive material is made of a fiber reinforced resin. The horizontal branch spacer according to claim 2,
The horizontal branch spacer, wherein the bar-like conductive material is an iron bar. A horizontal branch spacer according to any one of claims 1 to 3,
The core material protrudes from both ends of the spacer body,
The horizontal branch spacer, wherein the gripping metal grips a protruding portion of the core material. The horizontal branch spacer according to claim 4,
The horizontal branching spacer according to claim 1, wherein the protruding portion of the core member and the holding metal fitting are provided with screw portions that are screwed together. It is a manufacturing method of the horizontal branch spacer of Claim 3, Comprising:
A tubular member made of the fiber reinforced resin is produced by a pultrusion method,
Insert the iron bar inside the tubular member,
A method of manufacturing a horizontal branch spacer, wherein the pair of gripping metal fittings are attached to both ends of the iron bar so as to be electrically connected.

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