JPH07327308A - Split wire and prefabricated wire string for full prefabricated stringing work - Google Patents

Abstract

PURPOSE:To protect the surface of a wire against scratch due to contact with a split wire, when a prefabricated wire string is wound around a wire drum or rewound therefrom, by forming the outer periphery of the split wire of an elastic material. CONSTITUTION:The split wire 12A comprises a wire rope 15 of normal stranded steel wire coated with an elastic material 21 except the vicinity of ege parts 16 at the opposite ends thereof. Such structure of split wire 12A can be realized easily by extruding the elastic material 21, e.g. rubber, over the wire rope 15 to produce a coated wire rope, cutting the coated wire rope at a predetermined length and stripping the coating at the opposite ends thereof, thereby forming the annular parts 16. When the split wire is connected in series with a prefabricated wire and a prefabricated wire string is wound around a wire drum or rewound therefrom, the surface of the wire is protected against scratch clue to contact with the split wire.

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. The thickness of the split wire 12 'is determined in consideration of the safety factor in consideration of the maximum wire tension in the wire-drawing work. For example, a steel core aluminum stranded wire to which the completely prefabricated overhead wire construction method is applied. (ACSR) 610mm ² (outer diameter 34.2m
m) or 810 mm ² (outer diameter 38.4 mm), an outer diameter of 16 mm to 22 mm was used.

[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. Moreover, since the diameter of the split wire 12 'is considerably smaller than the diameter of the electric wire 6 as described above, when the prefabricated electric wire is wound around the electric wire drum 19 as shown in FIG.
Since it is impossible to wind the thick electric wire 6 and the thin split wire 12 ′ together in an array, and a step is generated between the electric wire 6 and the split wire 12 ′, a step drop of the electric wire 6 easily occurs. There is also the problem of doing. Due to this step drop, when the prefabricated electric wire is sent out from the electric wire drum 19 at the time of wire extension, a situation may occur in which the electric wire 6 and the split wire 12 ′ are entangled with each other, making it impossible to send out the wire. In FIG. 8, 19a indicates an electric drum drum, and 19b indicates an electric drum collar.

The present invention has been made in view of the above circumstances, and there is no fear that the surface of the electric wire wound around the electric wire drum will be scratched by the split wire, and that the electric wire will be dropped on the electric wire drum. Further, it is an object of the present invention to provide a split wire for a complete prefabricated overhead wire construction method and a prefabricated wire ream using the split wire, in which there is no possibility that the wire cannot be fed from the wire drum.

[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 the wire rope made of steel stranded wire is coated with elastic material on the outer periphery except for both ends. Here, the complete prefabricated overhead wire construction method refers to a prefabricated overhead wire method in which a compression type detention clamp is crimped to both ends of an electric wire that has been cut to a predetermined length, and the wire is extended using a prefabricated electric wire wound around an electric wire drum.

The split wire for the complete prefabricated overhead wire construction method according to claim 2 is characterized in that at least both ends of a metal stranded wire whose outer layer portion is aluminum are crimped with a compression type clamp having a connecting portion with a compression type straining clamp. And

A third aspect of the present invention is the split wire according to the first or second aspect, wherein the outer diameter is the same as the outer diameter of the electric wire to be installed.

A prefabricated wire system for a complete prefabricated overhead wire method according to claim 4 is a prefabricated wire system used for a complete prefabricated overhead wire method when a plurality of tension 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 an electric wire that is sized in accordance with the span length of each tension section, in a continuous manner through the split wire according to claim 1, 2, or 3. It is characterized by being connected.

[0011]

According to the first aspect of the present invention, since the outer circumference of the split wire is made of an elastic material, when the prefabricated electric wire is wound around the electric wire drum or extended, the surface of the electric wire is scratched by the contact between the electric wire and the split wire. There is no fear.

In the second aspect of the present invention, the split wire itself is composed of a stranded metal wire having at least an outer layer part made of aluminum, and the surface thereof is the same soft aluminum or aluminum alloy as the electric wire,
Similarly, there is no risk of scratches on the surface of the wire due to contact between the wire and the split wire.

According to the third aspect of the present invention, since the outer diameter of the split wire is the same as that of the electric wire, the electric wire and the split wire can be wound around one electric wire drum in an aligned manner without causing a step, and the electric wire can be prevented from falling. Can be prevented. Therefore, there is no possibility that the electric wire cannot be sent out from the electric wire drum.

[0014]

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 12A according to an embodiment of the present invention. The split wire 12A has a structure in which the outer periphery of the wire rope 15 made of a normal steel stranded wire is covered with an elastic material 21 except for the vicinity of the ring portions 16 provided at both ends thereof. Although rubber or the like is suitable as the material of the elastic material 21, a resin having elasticity can also be used. The outer diameter of the split wire 12A, that is, the outer diameter of the elastic member 21 is the same as the outer diameter of the electric wire 6 which is a steel core aluminum stranded wire to be erected. Note that reference numeral 18 is a compression processing portion such as an eye clamp. The length of the split wire 12A is, as described above with reference to FIG. 3, the lengths L ₁ and L of the tension insulator string 3.
₂ and the dimension L ₃ between the left and right support points of the tension plate 2a of the steel tower arm 2 are set. However, it is conceivable to adjust the length appropriately depending on the workability. The split wire 12A is manufactured by extruding an elastic material 21 such as rubber on the wire rope 15 to obtain a covered wire rope, cutting the covered wire rope into a predetermined length, and stripping the covering at both ends of the covered wire rope. It can be easily realized by forming the portion 16. Also, in place of this extrusion coating, cover the wire rope with a rubber heat shrink tube,
A method of heat-shrinking and coating can also be applied. In this case, the heat-shrinkable tube can be coated in several times until the required outer diameter is reached.

FIG. 5 shows a split wire 12B according to an embodiment of the present invention. This split wire 12B is a steel-core aluminum stranded wire (ACS) that has the necessary strength as a split wire.
R) 22 has a connecting portion 2 with the compression type strain clamp 5 at both ends.
The structure is such that a compression type clamp 23 having 3a is crimped. Reference numeral 22a indicates a steel core of the steel core aluminum stranded wire 22, and 22b indicates an aluminum wire portion. The outer diameter of the ACSR 22 is the same as the outer diameter of the electric wire 6. The compression type clamp 2
Although the strength performance of No. 3 is determined in consideration of the maximum wire drawing tension, the structure is a compression type of a 2-body type structure, which is generally used for retaining ACSR, and is a combination of a steel clamp and an aluminum clamp. Although a clamp can be used, a compression type clamp having a 1-body type structure that collectively compresses the steel core and the aluminum wire portion of ACSR is preferable. The material of the compression type clamp 23 is preferably aluminum, aluminum alloy or the like so as not to damage the electric wire 6. When the maximum wire drawing tension is low, a hard aluminum stranded wire without a steel core may be used instead of ACSR.

The split wires 12A and 12B are shown in FIG.
As described above, the prefabricated electric wires 11 in which the compression type detention clamps 5 are crimped to both ends of the electric wire 6 that is sized according to the span lengths of a plurality of tension sections existing in one extended wire section are continuously connected. Are connected to each other to form the prefabricated wire ream 13. That is, as shown in FIG. 6, the prefabricated electric wire ream 13 of the present invention connects the split wire 12A or 12B to the compression type detention clamps 5 at both ends of each prefabricated electric wire 11, and divides the wire-split wire-electric wire- It is composed of split wires to electric wires that are continuously connected at the factory and wound up on a single electric wire drum. As shown in the figure, the split wires 12A and 12B have substantially the same diameter as the outer diameter of the electric wire 6 which is ACSR (steel core aluminum stranded wire). When this prefabricated wire ream 13 is wound around the wire drum at the time of manufacturing, the wire 6 and the split wires 12A and 12B have the same diameter, so that there is no step between them and therefore, the wire 6 does not drop. When the wire is extended, the wire 6 and the split wire 12A or 12B are not entangled with each other when the prefabricated wire string 13 is sent out from the wire drum.

As a structure for connecting the split wire to the compression type detention clamp, the split wire 1 shown in FIG. 4 is used.
In 2A, instead of the ring portion 16, it is also possible to adopt another connecting structure such as a compression type clamp. Also,
The compression type clamp in the split wire 12B shown in FIG. 5 is not limited to the structure shown.

[0018]

According to the first aspect of the present invention, since the outer circumference of the split wire is made of an elastic material, when the prefabricated wire string in which the prefabricated electric wire and the split wire are connected in a continuous manner is wound on the wire drum or extended. There is no risk of scratches on the surface of the wire due to the contact between the wire and the split wire.

According to the second aspect of the invention, the split wire itself is composed of a stranded metal wire having at least an outer layer portion of aluminum, and the surface is the same soft aluminum or aluminum alloy as the electric wire. There is no risk of scratches on the surface of the wire due to contact.

According to the invention of claim 3, since the outer diameter of the split wire is the same as that of the electric wire, the electric wire and the split wire can be wound in line on one electric wire drum, and the step of the electric wire on the electric wire drum can be wound. It is possible to prevent the drop. Therefore, there is no possibility that the electric wire cannot be sent out from the electric wire drum.

[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 figure (a) is a side view, and the figure (b) is a cross-sectional view.

5A and 5B show a split wire according to another embodiment of the present invention, wherein FIG. 5A is a side view and FIG. 5B is a cross-sectional view.

FIG. 6 is a partially cut side view showing an embodiment of a prefabricated electric wire string according to the present invention.

FIG. 7 shows a conventional split wire, which is shown in FIG.
(B) is a side view of a different example.

FIG. 8 is a diagram illustrating a problem of a conventional split wire.

[Explanation of symbols]

1 Steel Tower 2 Steel Tower Arm 3 Tensile Insulator Chain 5 Compression Type Detention Clamp 6 Electric Wire 11 Prefabricated Wire 12, 12A, 12B Split Wire 13 Prefabricated Wire Chain 15 Wire Rope 21 Elastic Material 22 Steel Core Aluminum Stranded Wire (At least Outer Layer is Aluminum A certain metal stranded wire) 23 Compression type clamp 23a Connection part

Claims (4)

[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 the completely prefabricated overhead wire construction method, characterized in that the above is covered with an elastic material. 2. A split wire used for a complete prefabricated overhead wire construction method when a plurality of tension-resistant section spans exist in one extended section, at least both ends of a metal stranded wire whose outer layer part is aluminum. , A split wire for a complete prefabricated overhead wire construction method, characterized in that a compression type clamp having a connecting portion with a compression type strain clamp is crimped. 3. The split wire for the completely prefabricated overhead wire construction method according to claim 1, wherein the outer diameter is the same as the outer diameter of the electric wire to be installed. 4. A prefabricated cable ream used in a complete prefabricated overhead wire construction method when a plurality of tension-bearing section spans are present in one extended wire section, and a fixed length according to each tension-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, 2, or 3.