JPH08149635A - Split wire and prefabricated electric wire stub for fully prefabricated wire layout method - Google Patents

Abstract

PURPOSE: To prevent the surface of an electric wire wound around a wire drum from being scratched by split wires by putting an elastic tube having a slit over the full length of the tube in the length direction around the outer periphery of a wire rope except both end sections of the rope. CONSTITUTION: A prefabricated electric wire stub 13 is formed by alternately connection prefabricated electric wires 11 and split wires 12 to each other in such a way that each split wire 12 is connected to compressed anchoring clamps 5 at both ends of each prefabricated cable 11 and the formed stub 13 is wound around one cable drum. Each split wire 12 is constituted by putting an elastic tube which has a slit 21 over the full length in the length direction so that the side section of the slit 21 can be opened around the outer periphery of the wire rope 15 except the vicinities of annular sections 16 at both end sections of the rope 15. When the chain 13 is wound around the cable drum or extended, therefore, the surface of an electric wire 6 is not scratched by the split wires 12 even when the wires 12 are brought into contact with the wire 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split wire used when a plurality of tension-bearing section spans are present in one wire extension section and when an overhead power transmission line is erected by a complete prefabricated overhead wire construction method. The present invention relates to a prefabricated electric wire system.

[0002]

2. Description of the Related Art In recent years, a prefabricated overhead wire construction method has been used for the purpose of labor saving of overhead wire work. In this prefabricated overhead wire construction method, the distance between the wire support points in the section where the wire is to be erected is precisely measured, and the length of the wire required for the relevant overhead wire section is accurately determined by taking into account the length of the tension insulator and the specified sag. Calculate and mark each required wire length at the time of wire production and wind it up on the wire drum, cut the wire to the required wire length at the construction site, and crimp compression type detention clamps to both ends of the wire. After extending this wire through the wire car, the compression type detention clamps at both ends are connected to the tension-resistant insulator string attached to the tower arm, thus completing the overhead wire work. In addition, a prefabricated overhead wire construction method in which the prefabricated electric wire, in which the electric wire has been cut to a fixed length in advance at the factory and the compression type strain clamps have been crimped on both ends, has been wound up on the electric wire drum, and which is being extended while sending out the prefabricated electric wire from the electric wire drum at the construction site. Has been adopted.

Further, as a completely prefabricated overhead wire construction method adopted in the case of an overhead power transmission line such as that shown in FIG. 1, as shown in FIG. 2, a plurality of extension sections are stretched as a single extended section. A complete prefabricated overhead wire construction method for spans in tension-bearing sections is drawing attention. 1 and 2 are common to the present invention and the conventional example. In both figures, 1 is a tower, 2
Is a steel tower arm, 3 is a tension insulator string, 4 is a suspension insulator string, 5 is a compression type detention clamp, and 6 is an electric wire. The AB section in the figure is the span of one steel tower span with no suspended steel tower in the middle, and the BC section is the span of multiple steel tower spans (two spans in the figure) with suspended steel towers in the middle. . Also,
Reference numeral 7 is a wire car for wire drawing, 8 is a wire for wire drawing, and 9 is a wire rope on the wire drawing car side. This completely prefabricated overhead wire construction method is
A plurality of prefabricated electric wires 11 manufactured corresponding to a plurality of tension-bearing section diameters present in the extended wire section are referred to as electric wire-split wire-electric wire-split wire-electric wire ... The prefabricated cable station 13 connected in the factory in a continuous form is used.
3 is wound around one electric wire drum and brought to the construction site, one extension section including a plurality of tension section spans is continuously extended, and compression type of both ends of the prefabricated electric wire 11 between the tension section diameters After connecting the detention clamp 5 to the predetermined tension insulator string 3,
This is a method of removing the split wire 12. According to this completely prefabricated overhead wire construction method, prefabricated electric wires between a plurality of tension-bearing section diameters can be extended at one time, which greatly simplifies the work at the construction site. As shown in FIG. 3, the length of the split wire 12 in the above-mentioned prefabricated wire ream 13 is 3
L ₁ and L ₂ and the dimension L ₃ between the left and right support points of the tension plate 2 a of the steel tower arm 2 are set. However, it is conceivable to adjust the length appropriately depending on the workability. Therefore, at the end of the wire extension, all the compression type detention clamps 5 at both ends of the prefabricated electric wire 11 between the tension-resistant sections are in positions where they can be immediately connected to the tension-resistant insulator stations 3.

In the conventional completely prefabricated electric wire, as a split wire for connecting the prefabricated electric wires 11 to each other, as shown in FIG.
As shown in (a) and (b), a wire rope 15 made of a simple steel stranded wire is provided with ring portions 16 formed at both ends of the wire rope 15 in consideration of connection with a compression type strain clamp body or a connecting metal fitting. The split wire 12 'was used. The ring portion is formed by a tongue process 17 as shown in FIG. 7A or a compression process 18 such as an eye clamp.

[0005]

In the above-mentioned conventional completely prefabricated electric wire, the electric wire 6 and the split wire 12 'are wound around one electric wire drum as described above. The surface of the steel-core aluminum stranded wire is softer than that of steel, so the wire 6 and split wire 12 'contact and rub against each other during winding on the wire drum or wire drawing, and the surface of the wire 6 is scratched. There is a problem that will occur.

The present invention has been made in view of the above circumstances, and a split wire for a complete prefabricated overhead wire construction method and a prefabricated electric wire using the split wire, in which there is no fear that the split wire will scratch the surface of the wire wound around the wire drum. The purpose is to provide reams.

[0007]

A split wire for a completely prefabricated overhead wire construction method according to claim 1, which solves the above problems, is a complete prefabricated overhead wire in the case where a plurality of tension section spans are present in one extended section. A split wire used in the construction method, characterized in that an elastic material tube having slits is fitted over the entire length of the wire rope made of steel stranded wire excluding both ends.

The prefabricated cable ream for the complete prefabricated overhead wire construction method according to claim 3 is a prefabricated cable ream used for the complete prefabricated overhead wire construction method when a plurality of tension-bearing section spans are present in one extension section. , A plurality of prefabricated electric wires in which compression type detention clamps are crimped to both ends of the electric wires that are sized according to the span length of each tension section are connected in series through the split wire according to claim 1 or 2. Is characterized by.

[0009]

According to the first aspect of the present invention, since the elastic material tube is attached to the outer periphery of the wire rope made of the steel stranded wire, when the prefabricated electric wire is wound on the electric wire drum or is extended,
There is no possibility that the surface of the electric wire will be scratched by the contact between the electric wire and the split wire. The elastic tube has a slit over its entire length, so it can be attached to and detached from the wire rope. Therefore, the elastic material tube can be removed when the split wire is unwound from the electric wire drum, and it is possible to prevent the elastic material tube from hindering the airborne work performed by the worker riding on the split wire near the steel tower.
The split wire can be used repeatedly.

[0010]

EXAMPLES Examples of the split wire for the complete prefabricated overhead wire construction method of the present invention and the prefabricated electric wire series using the split wire will be described below with reference to FIGS. It should be noted that the same parts as the conventional ones will be described with the same reference numerals. FIG. 4 shows a split wire 12 according to an embodiment of the present invention. This split wire 12
Is an elastic material that has slits 21 along the entire length in the length direction on the outer circumference except for the vicinity of the ring portions 16 provided at both ends of the wire rope 15 made of a normal steel stranded wire and can open the side portions. It is a structure in which the tube 22 is attached. In addition,
Reference numeral 18 is a compression processing portion such as an eye clamp. Further, the length of the split wire 12 is, as described above with reference to FIG. 3, the lengths L ₁ and L _{2 of} the tension-resistant insulator string 3 and the dimension between the left and right support points of the tension plate 2a of the steel tower arm 2. It is set to the sum of the L _3. However, it is conceivable to adjust the length appropriately depending on the workability.

A specific embodiment of the elastic material tube 22 is shown in FIGS. This elastic material tube 2
2A is a slit 21A in which both edges are simply abutted with each other by simply making a notch in the entire length of a corrugated tube having a closed annular cross section made of an elastic material such as rubber or resin having elasticity. In this elastic material tube 22A,
By using the corrugated tube, an appropriate rigidity required for easy attachment / detachment to the wire rope 15 and an appropriate rigidity required for maintaining a normally closed state, and
It also has flexibility suitable for wrapping around an electric wire drum.

Another embodiment of the elastic material tube 22 is shown in FIGS. This elastic material tube 22B
Has a flat wall thickness without waves, and the slit 21B has a structure in which both circumferential edges are overlapped with each other. That is, the slit 22B has a lap shape. This wrap shape allows the wire rope 15 to have an appropriate rigidity necessary for being easily attached to and detached from the wire rope 15, and an appropriate rigidity necessary for maintaining a normally closed state, and a flexibility suitable for winding the wire drum. I try to combine it with sex.

The above elastic material tube 22A or 22B
As described with reference to FIG. 2, the split wire 12 having the compressive detention clamp 5 is provided at both ends of the electric wire 6 that is sized according to the plurality of span lengths of the tension-resistant sections existing in one extended section.
It is used for connecting the prefabricated electric wires 11 crimped with each other in a continuous manner to form a prefabricated electric wire ream 13. That is, as shown in FIG. 7, the prefabricated wire ream 13 of the present invention connects the split wire 12 to the compression-type detention clamps 5 at both ends of each prefabricated wire 11 and connects the wire to the split wire to the wire to the split wire. ~ It is constructed by connecting one continuous line at the factory in the form of an electric wire, and is wound on one electric wire drum.

The split wire 12 is the wire rope 1
Since the elastic material tube 22 is attached to the outer periphery of 5,
When the prefabricated wire ream 13 is wound around the wire drum or extended, there is no possibility that the surface of the wire 6 will be scratched by the contact between the wire 6 and the split wire 12.

By the way, when the split wire 12 reaches the tower 1 as the overhead wire progresses, the worker splits the wire 12.
Although the work is carried out by riding on the air, the elastic material tube 22 is loose between the wire rope 15 and the elastic material tube 22 while the elastic material tube 22 is still attached, and the elastic material tube 22 moves above the wire rope 15. Since it can rotate freely, it is dangerous for an operator who rides on the split wire 12 to work. However, since the elastic material tube 22 has the slits 21 in the length direction over the entire length, when the split wire 12 is paid out from the electric wire drum, the wire rope 15
It can be easily removed from the machine without the risk problems described above. Further, since the split wire 12 is repeatedly used, the elastic material tube 22 is connected to the wire rope 1
Although it is inconvenient if the split wire 12 is removed from the wire 5, the elastic material tube 22 having the slit 21 over the entire length can be easily attached to the wire rope 15, so that the split wire 12 can be repeatedly used.

As a structure for connecting the split wire 12 to the compression type detention clamp 5, it is possible to employ another connection structure such as a compression type clamp instead of the ring portion 16.

[0017]

According to the present invention, since the elastic material tube is fitted around the outer circumference of the wire rope made of steel stranded wire, the prefabricated electric wire series in which the prefabricated electric wire and the split wire are connected in one continuous line is used. When winding on a drum or drawing a wire,
There is no possibility that the surface of the electric wire will be scratched by the contact between the electric wire and the split wire. Also, the elastic material tube has a slit over the entire length and can be attached to and detached from the wire rope,
The elastic material tube can be removed when the split wire is unwound from the electric wire drum. Therefore, it is possible to avoid the elastic material tube from interfering with the airborne work performed by the worker on the split wire near the steel tower. Also,
Since the elastic material tube can be easily attached to the wire rope, the split wire can be used repeatedly.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an overhead power transmission line adopting a completely prefabricated overhead wire construction method.

FIG. 2 is a diagram illustrating a procedure of a completely prefabricated overhead wire construction method for performing an overhead wire according to the aspect of FIG.

FIG. 3 is a detailed plan view of a wire retaining portion in FIG.

FIG. 4 shows a split wire according to an embodiment of the present invention,
The same figure (a) is a front view and the same figure (b) is A-A of the same figure (a).
It is sectional drawing.

5A and 5B show an embodiment of an elastic material tube for the split wire, in which FIG. 5A is a front view and FIG.
Is a left side view of FIG.

6A and 6B show another embodiment of the elastic material tube in the split wire, wherein FIG. 6A is a front view and FIG.
Is a left side view of FIG.

FIG. 7 is a partially cut side view showing an embodiment of a prefabricated electric wire string according to the present invention.

FIG. 8 shows a conventional split wire, which is shown in FIG.
(B) is a front view of a different example.

[Explanation of symbols]

 1 Steel Tower 2 Steel Tower Arm 3 Tensile Insulator Chain 5 Compression Type Straining Clamp 6 Electric Wire 11 Prefabricated Wire 12 Split Wire 13 Prefabricated Wire Chain 15 Wire Rope 21, 21A, 21B Slit 22, 22A, 22B Elastic Material Tube

Claims (3)

[Claims] 1. A split wire used in a completely prefabricated overhead wire construction method when a plurality of tension-bearing section spans exist within one extended wire section, the outer circumference excluding both ends of a wire rope made of stranded steel wire. A split wire for a completely prefabricated overhead wire construction method, in which an elastic material tube having a slit is fitted over the entire length in the longitudinal direction. 2. The split wire for the complete prefabricated overhead wire construction method according to claim 1, wherein the slit portion of the elastic material tube has a lap shape in which both circumferential edges overlap each other. 3. A prefabricated cable ream used in a complete prefabricated overhead wire construction method when a plurality of tension-resistant section spans are present in one extended wire section, and a fixed length according to each stretch-resistant section span length. A plurality of prefabricated electric wires in which compression type detention clamps are crimped to both ends of the electric wire are connected in series through the split wire according to claim 1 or 2.