JPH09215141A - Method for winding electric wire for prefabricated trolley wire on drum and prefabricated stringing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of the manufacture by making it possible to manufacture a wire for a plurality of strain spans continuously without cutting it for each strain span and to reduce a transportation cost by lessening the number of drums using coupled drums, in manufacturing an electric wire for a prefabricated trolley wire. SOLUTION: Precise measured marks 7A, 7B, 7C are stamped at near both ends and the midpoint on a continuous electric wire 6 to be stringed in a plurality of strain spans. Coupled drums are used; a plurality of drums 1A, 1B are coupled in such a manner that they can be detached and an extra-length storing part 16 is provided at the coupled part. The electric wire 6 above is wound onto the coupled drums so that an electric wire for a strain span corresponds to a drum and the wire around the precise measured mark 7B at the midpoint is stored with an extra slacking length in the extra-length storing part 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of winding an electric wire for a prefabricated overhead wire and a prefabricated overhead wire construction method.

[0002]

2. Description of the Related Art Conventionally, a prefabricated overhead wire construction method for overhead power lines has been performed as follows. That is, at the factory, wind the electric wire with the precision scale mark around the drum and carry it to the construction site,
This wire is pulled out from the drum and passed through the wire-drawing car. At that time, the wire extension is temporarily stopped when the precision measuring mark passes through the wire drawing car, the required length is corrected and measured with the precision measuring mark as a reference, the wire is cut, and the pulling clamp is attached to the cutting end. Work to compress and fix. After the drawing clamp is attached, the wire drawing is restarted, and after the drawing is completed, the drawing clamp is attached to the tension tower through the insulator string.

However, this construction method is troublesome because the electric wire is cut and the pulling clamp is attached at the exit side of the wire drawing vehicle, that is, where the tension is applied. Therefore, recently, an extension car has been developed that allows a compression clamp fixed to the end of the wire to pass through.A so-called completely prefabricated overhead wire construction method, in which the tension clamps are compressed and fixed to both ends of the wire before the overhead wire construction, is considered. Has been done.

The completely prefabricated overhead wire construction method currently under study employs the following method in order to attach the retention clamps to both ends of the electric wire of one tension section at the preparatory stage before drawing the wire. That is, at the factory, an electric wire with a precision scale mark is wound on a drum as shown in FIG. 5 and shipped. This drum 1 is provided with a partition flange 5 between the flanges 3 and 4 at both ends of the body 2 and near the one flange 3, and the one flange 3 and the partition flange 5 are provided.
The winding start end side of the electric wire 6 is wound for a required length between the two, and the subsequent electric wire 6 is wound between the partition flange 5 and the other flange 4.

At the construction site, the winding start end side of the electric wire 6 from the drum loaded in the state shown in FIG.
Unwind until the precision measuring mark 7A appears, correct the measuring scale based on the precision measuring mark 7A, cut the wire, compress the strain clamp, and unwind until the precision measuring mark 7B appears on the winding end side of the wire 6 as well. The wire is cut and the strain clamp is compressed. After that, the electric wire 6 is pulled out from the winding end end side, and a wire drawing operation is performed through a wire drawing wheel of a pulling clamp passing type. As a result, no work is required on the exit side of the wire drawing vehicle, and safe and efficient wire drawing work can be performed.

[0006]

The electric wire for an overhead power transmission line normally has a unit of 1000 m to 2000 m per drum, but in the above-mentioned complete prefabricated overhead wire construction method, one tension section is one.
If it is a drum and one tension section is 300 to 600 m, it is necessary to manufacture short electric wires in a large number of times, which is inefficient in manufacturing, and the number of drums is increased by 2 to 3 times. There is a problem that the transportation cost will also increase significantly.

[0007]

[Means for Solving the Problems] As shown in FIG.
Assuming that the section is 1 tension section, and that 1 section of B section follows, the wire of length A + B is obtained rather than manufacturing the wire for section A and the wire for section B separately. It is more efficient to manufacture 6 continuously. Therefore, in the present invention, a precision measuring mark, which serves as a reference for determining the position of the retracting clamp, is attached near both ends and in the middle of a continuous electric wire that is extended in a plurality of tension-resistant sections, and the electric wires can be separated by a plurality of drums. Is wound around a connecting drum having an extra length storage portion connected to the connecting drum so that one tension section corresponds to one drum, and an electric wire near an intermediate precision measuring mark is connected to the connecting drum. It is characterized in that the extra length storage portion is stored with an extra length.

[0008]

The electric wire wound on the connecting drum is continuous, but is wound on another drum for each tension section, and the winding end of the previous tension section is wound on the next tension section. It is the beginning. In the vicinity of the boundary between the tension sections, for example, an intermediate precision scale mark is attached as shown in FIG. At the time of overhead line construction, the connecting drum is separated, the electric wire stored in the extra length storage section is pulled out, the correct measuring scale is taken based on the intermediate precision measuring mark, and the electric wire is cut. As a result, the electric wire can be cut into each tension-resistant section, so that the tension clamps are compressed at both ends of each electric wire. After preparing the electric wire with the pulling clamp for each tension-resistant section in this way, prefabricated overhead wire is performed.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a cross-sectional view showing a method of winding a prefabricated overhead wire for a drum according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a connecting drum used therein. The connecting drum 9 is composed of two drums 1A and 1B which can be separated and combined. Each of the drums 1A and 1B has notches 10 and 11 for pulling out electric wires formed in the flanges 3 and 4, and an inner cylinder portion 12 and an outer cylinder portion 13 are projected outside the one flange 3 so that the outer cylinder portion 13 has It has a structure in which a large number of bolt holes 14 are formed.

The inner diameter of the outer cylindrical portion 13 is slightly larger than the outer diameter of the other collar 4, and when the two drums 1A and 1B are aligned and abutted on the same axis, as shown in FIG. The collar 4 enters the outer cylindrical portion 13 of the drum 1B. In this state, the two drums 1A and 1B can be connected by screwing the bolt 15 from the outer circumference. In the connected state, an extra length storage portion 16 for the electric wire is formed between the collar 4 of the first drum 1A and the collar 3 of the second drum 1B.

The method of winding the electric wire for prefabricated overhead wire of the present invention using the connecting drum 9 and the prefabricated overhead wire method will be described below. When manufacturing the electric wire, first, the first drum 1A is set in the winding device, and the electric wire for the section A in FIG. 1 is manufactured and wound. At this time, as shown in FIG. 2, the winding start end side of the electric wire 6 is pulled out to the outside of the collar 3 by a length required for compression of the tension clamp and is fixed to the collar 3. A precision scale mark 7A is attached near the winding start end of the electric wire 6.

When the production of the electric wire 6 for the section A is completed and the intermediate precision measuring mark 7B comes, the winding is stopped and the length required for the correction measuring at the construction site, the cutting of the electric wire, and the retracting clamp compression. Only pull the wire 6 out of the collar 4. Electric wire 6 is a collar 4
At the portion that passes through the notch 11 (see FIG. 3) of the electric wire 6
Is fixed to the collar 4 so that the slack on the outside is not transmitted to the inside of the drum 1A.

Next, the second drum 1B is set in the same winding device, the winding start portion (intermediate portion) of the electric wire 6 is fixed to the outer surface of the collar 3, and the electric wire 6 is drawn into the drum 1B from the notch 10. After that, the two drums 1A and 1B are butted against each other on the same axis and connected by the bolt 15. At this time, the intermediate extra length portion of the electric wire 6 is stored in the extra length storage portion 16 between the two drums 1A and 1B. Electric wire 6 in the extra length storage 16
Since it is only stored loosely, it is preferable to put a cushioning material or the like in the extra length storage portion 16 so as not to be damaged by vibration or the like during transportation.

After connecting the first and second drums 1A and 1B, the electric wire 6 for the section B is manufactured and wound on the second drum 1B. After that, the winding end is fixed to the inner surface of the collar 4 of the drum, and the drum winding is completed. A precision scale mark 7C is also attached near the winding end of the electric wire 6.

After that, it is packed in the state shown in FIG. 2 and transported to the construction site, where the overhead line work is performed in the following order. First, the package is unpacked, the bolt 15 connecting the two drums 1A and 1B is removed, and the two drums 1A and 1B are separated. As a result, the intermediate surplus length portion of the electric wire 1 comes out, so that the electric wire 6 is cut by performing the correction measurement with the intermediate precision measurement mark 7B as a reference. This allows two drums 1A,
1B completely separates, so each drum 1A, 1
Strain clamps are compressed and fixed to both ends of the electric wire 6 wound around B. This completes the preparation of the prefabricated overhead wire, after which the first drum 1A and the second drum 1B
Perform the overhead line work in this order.

In the above-mentioned embodiment, the bolts are screwed in from the outside of the outer cylindrical portion in the radial direction of the flange to connect the two drums, but the connecting structure of the drums is not limited to this. As shown in FIG. 4, an inner concave and outer convex portion 17 may be formed near the outer circumferences of the collars 3 and 4, and a bolt 15 may be inserted through the convex portion 17 in the axial direction and tightened with a nut 18. Further, in the above embodiment, the case where two drums are connected has been described, but it is also possible to connect three or more drums, and in that case, the same procedure as in the above embodiment may be followed.

[0017]

As described above, according to the present invention, when manufacturing an electric wire for a completely prefabricated overhead wire, a plurality of tensile strength sections are continuously manufactured without dividing the electric wire for each tensile strength section. Therefore, the manufacturing efficiency is significantly improved. In addition, since a connected drum in which a plurality of drums are connected is used, the overall size is reduced, the number of drums is reduced, and the transportation cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the development of an electric wire that connects two tension sections.

FIG. 2 is a sectional view showing a method for winding a prefabricated overhead wire according to an embodiment of the present invention on a drum.

FIG. 3 is an exploded perspective view of a connection drum used in the drum winding method of FIG.

FIG. 4 is a cross-sectional view showing another example of the connecting drum used in the present invention.

FIG. 5 is a cross-sectional view showing a conventional method for winding a wire for a prefabricated overhead wire on a drum.

[Explanation of symbols]

 1A, 1B: Drum 2: Body 3, 4: Collar 6: Electric wire 7A, 7B, 7C: Precision scale mark 9: Connection drum 10, 11: Notch 12: Inner cylinder part 13: Outer cylinder part 14: Bolt hole 15 : Bolt 16: Extra length storage

Claims (2)

[Claims] 1. A plurality of drums can be separated from each other by attaching a precision measuring mark, which serves as a reference for determining the position of a tension clamp, to the vicinity of both ends and the middle of a continuous electric wire that is extended over a plurality of tension sections. Is wound around a connecting drum having an extra length storage portion connected to the connecting drum so that one tension section corresponds to one drum, and an electric wire near an intermediate precision measuring mark is connected to the connecting drum. A method of winding an electric wire for a prefabricated overhead wire, which is characterized in that an extra length is stored in an extra length storage portion. 2. A prefabricated overhead wire is carried by transporting a connecting drum wound with an electric wire by the method according to claim 1 to an overhead wire construction site and separating the connecting drum and the electric wire for each tension section at the overhead wire construction site. A prefabricated overhead wire construction method characterized in that