JP2003032863A - Wire spacer and aerial wire branching structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire spacer which has a polymer wire spacer and, even if an aerial wire branching structure using the wire spacer is used along a coast, etc., can avoid salt contamination effectively, and to provide an aerial wire branching structure having the wire spacer. SOLUTION: A plurality of supporters 7 supporting branch wires 24 are formed on a polymer spacer main part 11 of a wire spacer 1 in a longitudinal direction at prescribed intervals, and a plurality of protective covers 3 made of ordinary temperature expanding rubber having an elongation of 300-1000% are provided between the supporters 7. With such a constitution, the plurality of branch wires 24 branched from a main wire 23 are supported by the plurality of respective supporters 7 and, as the plurality of protective covers 3 are provided between the supporters 7 respectively, even if the wire spacer 1 is used along a coast, etc., contamination by salt, etc., can be avoided effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire spacer and an aerial branching structure of an electric wire, and more particularly to an electric wire spacer and an aerial branching structure of an electric wire which are preferably used for salt resistance.

[0002]

2. Description of the Related Art In the vicinity of road intersections, electric poles cannot be installed due to conditions such as permission to occupy the road.
Therefore, in the case of an electric wire that is laid horizontally, T
An aerial branch structure is adopted in which the branch line is branched from the main line by performing mold branching. As such an aerial branching structure, for example, in Japanese Unexamined Patent Publication No. 2000-278846, a messenger wire in which a polymer wire spacer is interposed midway in the length direction is stretched below the main wire, and the wire It has been proposed that the spacer body of the spacer for use has a branch line branched from the main line supported by a ring member provided on the spacer body via a clamp.

According to such an aerial branch structure, it is possible to support the branch line in an insulated state from the messenger wire without using a tension insulator or an edge-pin insulator, thereby simplifying the structure. Can be planned.

On the other hand, when the electric wire spacer is used in a coastal area or the like, it is known to attach a cylindrical protective cover to both ends of the spacer main body of the electric wire spacer in order to prevent contamination by salt. Has been.

[0005]

However, Japanese Patent Laid-Open No. 2000-2000
In the case where the aerial branching structure of the electric wire described in -278846 is used in a coastal area or the like, a spacer main body while supporting a plurality of branch wires even if a tubular protective cover is attached to both ends of the spacer main body. However, there is a problem in that it is not possible to effectively prevent the fouling due to salt content.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an aerial branching structure of an electric wire using a polymer electric wire spacer,
An object of the present invention is to provide an electric wire spacer capable of effectively preventing contamination due to salt even when used in coastal areas, and an aerial branching structure of an electric wire including the electric wire spacer.

[0007]

In order to achieve the above object, the invention according to claim 1 is such that a support portion for supporting an electric wire is provided in a predetermined direction along a longitudinal direction on a spacer body made of a polymer. A plurality of protective covers are formed at intervals, and a plurality of protective covers are provided between the support portions.

According to this structure, the plurality of support portions can support the branch line branched from the main line, and a plurality of protective covers are provided between the support portions. Therefore, even when it is used in a coastal area or the like, the plurality of protective covers provided between the respective support portions can effectively prevent stains due to salt and the like.

The invention described in claim 2 is the same as claim 1.
In the invention described in (1), the protective cover includes a fixing portion fixed to an outer peripheral surface of the spacer body, and a cover portion that is arranged to face the outer peripheral surface of the spacer body with a predetermined gap therebetween. Two protective covers are provided between the portions, and the two protective covers are arranged so that the cover portions do not face each other along the longitudinal direction of the spacer body.

For example, when two protective covers are arranged between the support parts so that the cover parts are opposed to each other along the longitudinal direction of the spacer body, the two cover parts may be opposed to each other.
If rainwater containing salt or the like directly invades, the spacer main body is contaminated over most of the longitudinal direction between the support portions.

According to this structure, however, two protective covers are arranged between the supporting parts so that the cover parts do not face each other along the longitudinal direction of the spacer body, that is, the fixing parts are fixed to each other. Are facing each other, or one is covered and the other is fixed so that even if rainwater containing salt directly enters one cover, the other cover will It is possible to prevent contamination between the supporting portions.

The invention described in claim 3 is the same as claim 1
Alternatively, in the invention described in 2, the protective cover is 3
It is characterized in that it is formed of a room-temperature stretchable rubber having an elongation of 100 to 1000% as a member separate from the spacer body.

In this electric wire spacer, since a plurality of protective covers are provided between the respective support portions, for example, when such a plurality of protective covers are integrally molded with the spacer body, a dedicated large mold is used. Therefore, there is a problem that the cost is increased.

However, if the protective cover is formed as a member separate from the spacer body by the normal-temperature stretchable rubber having an elongation of 300 to 1000% as in this structure, the spacer body is stretched in the extended state. After inserting from the longitudinal direction, if necessary, an adhesive is applied to the interface and the stretching is released, so that this protective cover can be easily pressure-bonded and fixed to any position between the support portions of the spacer body. . Therefore, for example, compared to the case where the spacer body and the protective cover are integrally molded,
A large dedicated mold is not required, and the cost can be reduced. Furthermore, even after the protective cover is attached, it can be attached to another position in the spacer body by extending it again, so that it is possible to always realize a modified use in accordance with the actual use.

The invention described in claim 4 is the same as that of claim 1.
The invention according to any one of claims 1 to 3, wherein the cover portion of the protective cover has an inner cover portion that surrounds the spacer body with a predetermined gap, and a predetermined gap around the inner cover portion. It is characterized in that it is provided with an outer cover portion that covers apart.

According to this structure, since the cover portion of the protective cover is formed as a double structure of the inner cover portion and the outer cover portion, the creepage distance required for insulation is increased and, for example, a typhoon or the like. By this, it is possible to effectively prevent the infiltration of rainwater containing salt and the like sprayed from various angles into the cover portion.

The invention described in claim 5 is the same as claim 1.
The invention according to any one of claims 1 to 4 is characterized in that the cover portion of the protective cover has a depth of 30 to 60 mm along the longitudinal direction of the spacer body.

If the depth of the cover of the protective cover is too shallow, it is not possible to effectively prevent the infiltration of rainwater containing salt and the like into the cover, which increases leakage current and damages the insulation wire coating ( It is said to be tracking). On the other hand, if the depth of the cover portion is too deep, the protective cover becomes large and it is difficult to provide a plurality of protective covers between the support portions.

However, according to this structure, since the depth of the cover is 30 to 60 mm, it is possible to effectively prevent the infiltration of rainwater containing salt and the like into the cover while maintaining good performance between the support portions. It is possible to provide a plurality of them.

Further, the invention according to claim 6 is an aerial branch structure of an electric wire in which a branch line is branched in the air from a main line of the electric wire, and in the lengthwise direction below the main line. A messenger wire in which the electric wire spacer according to any one of claims 1 to 5 is interposed, and the electric wire spacer supports a branch line branched from the main line. It has a feature.

[0021] In such an aerial branching structure, since the electric wire spacers that can effectively prevent the contamination due to salt and the like are used, they can be favorably used in coastal areas and the like.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an embodiment of the electric wire spacer of the present invention.

In FIG. 1, the electric wire spacer 1 is
Preferably, in an aerial branching structure of an electric wire, which will be described later, it is attached in the middle of a messenger wire, and is provided with a protective cover 3 which is formed of a polymer spacer 2 and is formed as a separate member.

The polymer spacer 2 is made of a solid cylindrical FRP core material 4, two metal support fittings 5 into which both ends of the core material 4 are inserted and fixed, and the core material 4. And a supporting portion 7 (each support) that supports a plurality of (three) branch lines 24 (see FIGS. 3 and 4), which will be described later, provided in the middle of the core material 4 in the longitudinal direction. When distinguishing the parts 7, the supporting parts 7a and 7b
And a supporting portion 7c. ) Is provided.

Each of the support fittings 5 has a tubular portion 8 into which both ends of the core material 4 are inserted. With the both end portions of the core material 4 inserted in the tubular portion 8, the tubular portion 8 is inserted. Is crimped and fixed to the tubular portion 8 of each support fitting 5 by being caulked with a die or the like.

Although not shown in FIG. 1, both ends of the covering material 6 are also crimped and fixed at the open end of the tubular portion 8 of each support fitting 5.

Each of the support fittings 5 has a substantially U-shaped connecting portion 9 which is continuous with the tubular portion 8. A fixed line thimble is inserted into the connecting portion 9 so that one end thereof is pinned. Bolt 1
0 is inserted.

The covering material 6 is made of silicone rubber, and is formed so as to directly cover the periphery of the core material 4 in the longitudinal direction. The core body 4 coated with the coating material 6 constitutes the spacer body 11.

The support portion 7 is made of a synthetic resin such as epoxy resin and has a bobbin shape consisting of two ring members having a substantially concave cross section, and is spaced around the core material 4 in the spacer body 11 at substantially equal intervals in the longitudinal direction. Multiple (three) are provided.

The protective cover 3 has an elongation of 300 to 1000%, more preferably 500 to 800%, and tracking resistance (for example, IEC60587-3.5 kV or higher judgments A and B both passed or higher), For example,
As shown in FIG. 2, a fixing part 12 having a small-diameter tubular shape and a fixing part 12 made of normal-temperature elastic rubber such as silicone rubber.
And a cover portion 1 having a larger diameter double tubular structure
3 and 3 are integrally formed.

The fixing portion 12 can be stretched to have an opening diameter larger than the diameter of the support portion 7 of the polymer spacer 2 and the like. The spacer body 11 is formed into a tubular shape having a diameter such that it can be pressure-bonded and fixed to the outer peripheral surface of the covering material 6.

Further, the cover portion 13 includes a base end portion 16 whose diameter is expanded from the fixed portion 12, and an inner cover 14 and an outer cover 15 which extend continuously from the base end portion 16 and are opened at the free end portion. The inner cover 14 is integrally formed, and in a state where the fixing portion 12 is pressure-bonded and fixed to the surface of the covering material 6, the inner cover 14 covers the outer peripheral surface of the covering material 6 at predetermined intervals, and the outer cover 15 is The inner cover 14 is formed as a double cylindrical structure so as to cover the inner cover 14 with a predetermined space.

As described above, since the cover portion 13 is formed as a double-cylindrical structure of the inner cover portion 14 and the outer cover portion 15, for example, salt and the like sprayed from various angles by a typhoon or the like. It is possible to effectively prevent intrusion of rainwater including the water into the cover portion 13, and it is possible to increase the creepage distance, which is advantageous for insulation.

The length (depth) L of the inner cover portion 14 and the outer cover portion 15 along the longitudinal direction of the spacer body 11 is formed so that the outer cover portion 15 is slightly longer than the inner cover portion 14. Has been done, both 3
It is selected in the range of 0 to 60 mm.

If the depth of the cover 13 is too shallow, it is not possible to effectively prevent the infiltration of rainwater containing salt or the like into the cover 13, and the leakage current increases to damage the insulated wire. On the other hand, if the cover 13 is too deep,
The protective cover 3 becomes large in size, and it becomes difficult to provide a plurality (two) between the support portions 7 as described later, but in this way, the depth of the cover portion 13 is 30 to 60 m.
By selecting in the range of m, two can be favorably provided between the support parts 7 while effectively preventing the infiltration of rainwater containing salt and the like into the cover part 13.

Incidentally, in FIG. 2, the inner cover portion 14
The outer cover portion 15 is formed deeper than the inner cover portion 14 in the depth range of 30 to 60 mm.
In the range of 60 mm, the outer cover portion 15 may be formed shallower than the depth of the inner cover portion 14, and preferably, in the range of 30 to 60 mm, the outer cover portion 15 is formed with respect to the depth of the inner cover portion 14. The depth of the portion 15 is formed to be substantially equal to or deeper than that.

The protective cover 3 is inserted into the spacer body 11 from one end of the polymer spacer 2 in the longitudinal direction in a state where the fixing portion 12 is stretched so that its opening becomes wide, for example. Depending on the arrangement, after passing through the support portions 7 and the like, an adhesive is applied to the interface and the stretching is released, so that the spacer body 11 is crimped and fixed between the support portions 7 and both end portions. ing. More specifically, the spacer body 1
1 between the support fitting 5 and the support portion 7a, between the support portion 7a and the support portion 7b, between the support portion 7b and the support portion 7c, and between the support portion 7c and the other support fitting 5. Two protective covers 3 are provided in each of the four sections between them, and as shown in FIG. 1, two adjacent protective covers 3 in each section are such that their fixing portions 12 face each other. It is arranged.

As described above, in the electric wire spacer 1,
Since two protective covers 3 are provided between the respective support portions 7, for example, two such protective covers 3 are provided.
In the case of integrally molding with the spacer main body 11, there is a problem that a large dedicated mold or the like is required, which leads to an increase in cost.
By the room temperature elastic rubber having 0 to 1000% elongation,
If formed as a separate member from the spacer body 11, the protective cover 3 is stretched and then inserted from the longitudinal direction of the spacer body 11 and then the stretching is released. The protective cover 3 can be easily pressure-bonded and fixed to any position. Therefore, for example, as compared with the case where the spacer body 11 and the protective cover 3 are integrally molded, a large dedicated mold or the like is not required, and the cost can be reduced. Furthermore, even after the protective cover 3 is attached, it can be attached to another position in the spacer body 11 by stretching it again, so that it is always suitable for actual use.
Modified use can be realized.

Further, for example, when the two protective covers 3 are arranged between the support portions 7 so that the cover portions 13 face each other along the longitudinal direction of the spacer body 11, the two cover portions 13 face each other. When the rainwater containing salt or the like directly infiltrates, the spacer body 11 is contaminated over most of the longitudinal direction between the support portions 7, but as shown in FIG. If the fixed portions 12 of the two protective covers 3 are arranged so as to face each other between the two, even if rainwater containing salt or the like directly enters one cover portion 13, the other cover portion 13 supports the rainwater. Contamination between the parts 7 can be prevented.

In this electric wire spacer 1, the three supporting portions 7 can support the branch line 24 branched from the main line 23, which will be described later, and two supporting lines 7 are provided while the supporting portions 7 are provided. Since the protective covers 3 are respectively provided, even when the protective covers 3 are used in the coastal area, the two protective covers 3 provided between the respective supporting portions 7 can effectively prevent the stains due to salt and the like.

Therefore, such a wire spacer 1
Is a wire spacer to be inserted in the middle of a messenger wire in a so-called aerial T-shaped branch structure in which a messenger wire is stretched below a plurality of main lines and a plurality of branch lines are respectively supported by the messenger wire. Can be preferably used.

Next, an aerial T-shaped branch structure in which the electric wire spacer 1 is used will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, this aerial T-shaped branch structure is mainly used for aerial installation of horizontally laid electric wires in places where it is not possible to install utility poles due to conditions such as road intersections, such as near road intersections. It is applied to make a T-shaped branch at.

In FIG. 3, this T-shaped branch structure has three main lines 23 horizontally laid between two utility poles 21 and 22 and three branch lines 24 corresponding to each main line 23. The branch wire 24 is branched and wired toward the utility pole 20. In this branch structure, first, the branch lines 24 are respectively branched from the three main lines 23 by a known method, and the utility poles 2 are provided below the main lines 23.
A messenger wire 25 in which the above-mentioned electric wire spacer 1 is interposed is stretched in the middle of the length direction between 1 and 22.

To interpose the wire spacer 1 on the messenger wire 25, the messenger wire 25 is attached to each connecting portion 9 of one wire spacer 1 prepared in advance, as shown in FIG. . More specifically, a flexible elongated strap-like retention grip 26.
This pulling grip 26 by using
A thimble for a branch line may be inserted into the connecting portion 9 of the above, and the thimble may be connected to the fixing bolt 10 that is inserted and wound around the messenger wire 25. The detention grip 26 is usually made of steel wire.

Then, as shown in FIG. 3, the messenger wire 25 in which the electric wire spacer 1 is interposed is connected to the utility poles 21 and 22 below the main line 23.
Messenger wire 25
The branch lines 24 branched from the main line 23 are respectively supported by the respective support portions 7 of the electric wire spacer 1 in FIG. In addition,
Messenger wire 25 between power poles 21 and 22
In order to stretch the wire, a known method may be appropriately used.

The main line 2 is attached to each supporting portion 7 of the electric wire spacer 1.
In order to support the respective branch lines 24 branched from 3, the winding grip 27 may be used as shown in FIG. That is, in order to support each branch line 24 on each support part 7 by the winding grip 27, first, the winding grip 27 is wound around each support part 7, and then the winding grip 27 is wound in the middle of each branch line 24. Just do it.

In such an aerial T-shaped branch structure, since the above-mentioned electric wire spacer 1 is used, the three supporting portions 7 of one electric wire spacer 1 are branched from the three main wires 23. While being able to support each of the three branch lines 24, the two protective covers 3 are respectively provided while the respective supporting portions 7 are provided, even when used in a coastal area or the like, By the two protective covers 3 provided between the respective support portions 7, it is possible to effectively prevent stains due to salt and the like.

In the above description, in the aerial T-shaped branch structure, the messenger wire 25 in which the electric wire spacer 1 is interposed is stretched in the horizontal direction. However, for example, the electric wire spacer 1 is used. The messenger wire 25 in which is inserted may be stretched in the vertical direction. FIG. 5 is a side view showing an embodiment of the electric wire spacer 1 which is interposed when the messenger wire 25 is vertically stretched.

That is, as shown in FIG. 5, also in the electric wire spacer 1, two protective covers 3 are provided at both ends of the spacer body 11 and two protective covers 3 are also provided between the support portions 7. However, in order to prevent the intrusion of rainwater, all of these protective covers 3 are arranged in the longitudinal direction of the spacer body 11 such that the opening of the cover portion 13 faces downward, that is, Between the support portions 7, one fixed portion 12 of the two protective covers 3 and the other cover portion 13 are arranged so as to face each other.

[0051]

As described above, according to the invention described in claim 1, even when it is used in a coastal area or the like, it is possible to effectively prevent stains due to salt and the like.

According to the second aspect of the present invention, even if rainwater containing salt directly enters one of the cover portions,
Contamination between the supporting parts can be prevented by the other cover part.

According to the third aspect of the invention, it is possible to reduce the cost, and it is possible to always realize the modified use in accordance with the actual use.

According to the fourth aspect of the present invention, it is possible to effectively prevent intrusion of rainwater containing salt and the like sprayed from various angles into the cover portion due to a typhoon or the like. It is possible to prevent the stains from being caused.

According to the fifth aspect of the present invention, while effectively preventing rainwater containing salt and the like from entering the cover portion,
Plural pieces can be favorably provided between the respective support portions.

According to the sixth aspect of the present invention, since the electric wire spacer that can effectively prevent the stain due to the salt content is used, it can be favorably used in the coastal area and the like.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment (a usage mode in a horizontal direction) of an electric wire spacer of the present invention.

FIG. 2 is a side sectional view of a main part in FIG.

FIG. 3 is an overall configuration diagram showing an embodiment of an aerial T-shaped branch structure.

FIG. 4 is a perspective view showing a main part of the aerial T-shaped branch structure in FIG.

FIG. 5 is a side view showing another embodiment (a usage pattern in a vertical direction) of the electric wire spacer of the present invention.

[Explanation of symbols]

1 Electric wire spacer 3 protective cover 7 Support 11 Spacer body 12 Fixed part 13 Cover 14 Inner cover 15 Outer cover part 23 main lines 24 branch lines 25 messenger wire

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5G331 AA06 BA01 BC09 CA04 CA05                       CA06 DA03 EA17                 5G333 AA13 AB02 AB18 AB28 CA01                       CB15 CC09 DA03 DA11                 5G367 HA01 HC01 HH02

Claims (6)

[Claims] 1. A polymeric spacer body is provided with a plurality of supporting portions for supporting electric wires at predetermined intervals along the longitudinal direction, and a plurality of protective portions are provided between the supporting portions. A spacer for electric wires, characterized in that a cover is provided. 2. The protective cover includes a fixing portion fixed to an outer peripheral surface of the spacer body, and a cover portion arranged to face the outer peripheral surface of the spacer body at a predetermined distance. Two protective covers are provided between the two, and the two protective covers are arranged so that the cover portions do not face each other along the longitudinal direction of the spacer body. Item 1. The electric wire spacer according to Item 1. 3. The protective cover is 300-1000%
By a room-temperature elastic rubber having an elongation of, is formed as a separate member from the spacer body,
The electric wire spacer according to claim 1. 4. The inner cover portion that covers the periphery of the spacer body at a predetermined interval, and the outer cover that covers the periphery of the inner cover portion at a predetermined interval, in the cover portion of the protective cover. The electric wire spacer according to any one of claims 1 to 3, further comprising a portion. 5. The depth of the cover portion of the protective cover along the longitudinal direction of the spacer body is 30 to 60 mm.
The electric wire spacer according to any one of claims 1 to 4, wherein 6. An aerial branch structure of an electric wire in which a branch line is branched in the air from a main line of the electric wire, wherein the branch line is below the main line and in the middle of its length direction.
A messenger wire in which the electric wire spacer according to any one of claims 1 to 5 is interposed, which is stretched, and a branch line branched from a main line is supported by the electric wire spacer. The aerial branching structure of the electric wire.