JPS6011524B2 - How to extend and tie up overhead ground wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for extending an overhead ground wire encapsulating optical fiber for information transmission and securing it to a steel tower.

In recent years, optical fiber cables (hereinafter referred to as optical cables) have been developed and used for communications.

Since this optical cable has a large information capacity and is not subject to electromagnetic transfer interference, it can be enclosed in an overhead ground wire and does not require the installation of a separate communication cable. FIG. 1 is a cross-sectional view showing an example of this optical fiber-containing overhead ground wire (hereinafter referred to as composite overhead ground wire), and 21 is a plurality of aluminum or aluminum alloy wires, aluminum-coated steel wires, or galvanized steel wires. The composite overhead ground wire 20 is composed of a twisted wire made of a metal wire such as a wire or a composite wire 22, and an optical cable 10 is enclosed in the center of the twisted wire instead of a bare wire.

In this explanation, optical fiber cable (optical cable)
means a wire with one or more optical communication fibers (glass fibers) as the core and coated with synthetic resin, or if necessary, a metal pipe or cushioning material on the outside of the wire. means a covered cable (see Figure 1).

Conventionally, to install a normal overhead ground wire, first connect a wire extension clamp to the end of the wire to extend the wire, then connect a pull fin clamp after the main wire by compression and tie it to the steel tower. Separate clamps and compression retention clamps were used.

However, when constructing a composite overhead ground wire, optical cable 10
In order to connect the terminal parts of the electric wires that have been exposed and stripped in stages to the respective clamps, a place to receive each exposed optical cable 10 and a protective means to prevent damage to the optical cables are required, making the structure complicated. In addition, the work from extending the wire to tying it down is laborious, takes a long time, and is therefore expensive.

The present invention was made to solve the above-mentioned problems, and by using a special shape that can be used as both a wire extension clamp and a drag crab clamp, a composite overhead ground wire can be created by simply replacing some parts. A method for extending and pulling composite overhead ground wires that can be easily carried out from wire extension to anchorage, and that simplifies tools, simplifies work, shortens time, and thus saves labor and overhead line costs. This is what we intend to provide.

As shown in the embodiments in FIGS. 2 to 6, the present invention comprises an aluminum sleeve 2 having a cylindrical portion 4 to which a jumper socket 3 is attached, and an end portion of a steel sleeve 1 inserted into the aluminum sleeve 2 which is tightened from the inside. A wire metal odor attachment part 5, a retainer metal odor attachment part 6, and a male screw 7 for attaching a wire extension cap are provided, and a wire insertion hole 8 is provided.
A steel sleeve 1 is provided with a through hole 9 for guiding the optical fiber cable 10 from the bottom to the terminal, and an optical fiber cable base 11 is attached to the outlet of the through hole 9. Twisted wires 2 of the terminal portion 19 of the stripped optical fiber-containing overhead ground wire 20
1 and the optical fiber cable 10, a protective mandrel 12 is placed between
The end portion 19 is compressed and connected to the steel sleeve 1, and then the aluminum sleeve 2 is placed over it and the wire extension cap 13 is screwed into the male screw 7 for attaching the tax record, and the aluminum sleeve 2 and After attaching the protector 14 to the steel sleeve and extending the wire, the protector 14 is removed, and the wire tension fitting 15 is attached to the continuous wire attachment part 5.
After attaching the wire extension cap 13 and applying tension to it, the wire extension cap 13 is removed, and the retainer fitting 1 is attached to the retainer attachment part 6.
6 is attached to a steel tower by connecting them with bolts and nuts, and then the wire tensioning fittings 15 are removed.

The composite overhead ground wire used in the present invention is not limited to the structure shown in FIG. FIG. 2 is a partially cutaway front view showing the state of the clamp during wire extension in the embodiment of the present invention.

In the figure, the main body of the clamp consists of a steel sleeve 1 and an aluminum sleeve 2, and a wire drawing cap 13 is screwed into and connected to a wire drawing cap attachment male thread 7 provided at the end of the steel sleeve 1. The aluminum sleeve 2 is placed over the steel sleeve to compress the outer periphery and make an electrical connection.The jumper socket 3 prevents the metal wheel from passing during wire extension, and is designed to be removable. A knotted part 4 is provided in the cylindrical part 4, and the jumper socket 3 is attached to the cylindrical part 4 with bolts and nuts 23 after the wire is drawn. The steel sleeve 1 includes a wire connecting portion 24 for inserting the wire into the wire insertion hole 8 and compressing the outer periphery, a cylindrical portion 25 that is subsequently inserted into the cylindrical portion 4 of the aluminum sleeve 2, a wire tension fitting mounting portion 5, The retainer attachment part 6 having bolt holes 42 and 42 and the male attachment screw 7 are provided at the end thereof.

A through hole 9 for guiding the optical cable 10 is provided at the center of the steel sleeve 1 from the bottom of the wire insertion hole 8 to the end thereof. First, to connect the steel sleeve 1, as shown in the figure, the terminal part of the composite overhead ground wire (electric wire) 20 is connected to the central optical cable 10 for a predetermined length (necessary to connect to the optical cable joint box on the steel tower). A sliding door-shaped protective mandrel 12 is inserted between the optical cable 10 and the stranded wire 21 to prevent damage to the optical cable when compressed, and the wire is inserted into the wire insertion hole 8. Insert it and compress the outer circumference. The optical cable 10 pulled out here is guided to the U-shaped connecting hole 57 of the wire extension cap 13 through the through hole 9, and then folded back as shown in FIG. It passes through the groove 44 on the outer periphery and is extended along the outer periphery of the aluminum sleeve 2. An optical fiber cable base 11 is provided at the exit of the through hole 9 to securely hold the optical cable 10 and protect the optical cable 10 during overhead line work and during subsequent use of the wire.

FIG. 5 is an enlarged view of the vicinity of the connection part of the wire extension cap 13 shown in FIG.
The left side view of FIG. 3 and FIG. 3 are top views, and the same reference numerals as in FIG.

As shown in Figure A, the outlet of the through hole 9 is provided with a stepped insertion hole 26 having, for example, a female thread 27' on a part of the inner surface.

Into the insertion hole 26, first insert a sleeve 28 with a tapered inner surface into the inner part, insert a sleeve 29 with a split outer surface with the same taper, and then insert a screw-in fitting that presses the rear end surface 30 of this sleeve 29. 31, and the male thread 27 provided on its outer surface is inserted into the female thread 2 of the insertion hole 26.
7', the optical cable 10 is firmly held by the split sleeve 29, so that it is firmly fixed to the steel sleeve 1 and protected by the optical cable base 11. Note that the optical cable base 11 is not limited to the structure shown in FIG. 5, but may have any structure as long as it is firmly fixed to the optical cable 10 by screwing at the exit of the through hole 9. The clamp assembled as shown in FIG. 2 can be used as a wire extension clamp for electric wires.

In this case, in order to facilitate passage of the fishing wheel and protect the compression part of the clamp, a protector is attached to the two aluminum sleeves.
4 is installed. The protector 14 includes a protective cover 32 made of, for example, a special steel plate, which is placed over the outer circumference of the aluminum sleeve 2, and a tapered tube 33, made of, for example, rubber or urethane, which is placed over the outer circumference of the electric wire 20 at the mouth of the aluminum sleeve 2. As shown in the figure, the tube 33 has one crack 34, and after covering two wires, it is attached with a bind wire 35. Further, the cover 32 is divided into two parts as shown in the figure, and after covering the aluminum sleeve 2, the cover 32 is attached vertically using the same binding wire 35. A rubber tape 36 is wrapped over the binding line 35 to protect it.
After attaching the protector 14, cover the outer periphery of the recessed wire tension attachment part 5 with a split protective collar 17 of approximately the same width to make the surface of the clamp flat, and attach the wire to the pin 37 of the wire extension cap 13. - (not shown) and wire 2
Extend line 0.

When the wire extension is completed, the protective collar 17 and protector 14 shown in FIG. 2 are removed, and a continuous wire fitting 15 as shown in FIG. 6 is attached to the wire tension fitting attachment part 5. Figure 6A is a side view of the tensioning fitting, and the front view is also a front view. It is attached and fixed.

U-shaped cable screws 40, 40 are attached to the bolt holes 39, 39, a wire 41 is hung thereon, and by pulling the wires, the electric wire is straightened to a predetermined degree of slack. The wire extension cap 13 is placed in a state where the tension of the wire is borne by the wire tension fitting 15.
Remove. Next, the retainer fitting 16 as shown in FIG. 4 is attached to the bolt holes 42, 42 of the retainer attachment part 6 of the steel sleeve 1 with bolts and nuts 43, 43, thereby forming a crab clamp.

FIG. 4 is a diagram showing an example of a retaining fitting, in which the figure A is a front view and the figure at the mouth is a top view.

The retaining fitting 16 has a hinge portion 45 at the other end, and is attached to the steel tower via the fitting 46. The wire extension cap 13 is connected to the steel sleeve 1 by a male mounting screw 7, but it has been dangerous to use a screw for many years to provide tension to the overhead wire, so instead, as described above, the retaining fitting 16 is connected to the steel sleeve 1 by using a bolt. Nut 43,4
By installing the line at 3, it can safely withstand the tension of the overhead line for many years. After attaching the retaining fitting 16 to the steel tower, attach the optical cable protection pipe 47 to the optical cable base 11 as shown in FIG.
8 using the male screw 7 for attaching the wire extension cap.

FIG. 7 is a diagram showing an example of the state of the hooked part after it has been secured to the steel tower according to the embodiment of the present invention, particularly details of the optical cable take-out part, where Figure A is a longitudinal cross-sectional view and Figure 7 is a top view. . In the figure, the same reference numerals as in FIGS. 2 and 4 indicate the same parts, respectively. The optical cable protection pipe 47 is for guiding and protecting the pulled out optical cable 10 through it.
It has a predetermined length, that is, the length necessary to protect the optical cable from obstacles, foreign objects, lightning strikes, etc.
8 is cut out. To attach the pipe 47 to the optical cable outlet, the screw fitting 31 (FIG. 5) of the optical cable base 11 is removed and fixed with a protective pipe fitting as shown in FIG. 7. The protective pipe mounting bracket includes, in order from the back, a washer 49 that contacts the rear end surface 30 of the sleeve 29 with a split, and a screw 48 at one end of the pipe 47.
A collar with a flange 50 screwed into it, a screw-in fitting 51
, sleeve 52 with a tapered outer surface, restraining sleeve 53 with a tapered inner surface, fixing nuts 54 and 55
The pipe 47 is fixed to the outlet of the through hole 9 of the steel sleeve.

Further, the protective cap 18 protects this protective pipe fitting. 56 is a cap fixing screw.

When the optical cable 10 pulled out from the through hole 9 is passed through the pipe 47 and fixed with the above-mentioned protective pipe fitting, the optical cable 10 is firmly held by the split sleeve 29 and the pipe 47 is firmly fixed. 47, so it is safe and undamaged.

The optical cable 10 pulled out from the pipe 47 is connected to, for example, an optical cable joint box (not shown) on a steel tower. Further, the jumper socket 3 is attached to the cylindrical portion 4 of the aluminum sleeve 2 with bolts and nuts 23.

In this way, the extension and retention of the composite overhead ground wire is completed. As described above, the wire stretching and retaining method of the present invention includes the above-described aluminum sleeve 2, the wire tension attachment part 5, the retainer attachment part 6, and the male screw 7 for attaching the wire extension cap. ,
In addition, a steel sleeve 1 is provided with a through hole 9 for guiding the optical fiber cable 10 and a cap 11 for the optical fiber cable is attached, and when the wire is being extended, the wire extending cap 13 is screwed into the male mounting screw 7. Then, after attaching the tension fitting 15 to the tension tension attachment part 5 and applying tension to it, attach the tension fitting 16 to the tension tension attachment part 6 at the time of tensioning. Since it is used as a clamp, the clamp body, which requires a troublesome compression connection, can be used both as a wire extension clamp and as a retention clamp. Only one compression connection of the wire is required, and it can be used for both purposes by simply replacing some parts. Therefore, from the extension of the composite overhead ground line to the tie-down,
It has the advantage of being easy to work with at the drum drawing station, simplifying the tools, simplifying the work, reducing time, and thus significantly reducing labor and overhead line costs.

Further, as described above, the present invention inserts the protective core 12 between the rattan wire 21 of the terminal portion 19 and the optical cable 10 when compressing the electric wire, so that the optical cable 10 is not damaged.
It has the effect of providing safety protection, and as mentioned above, the optical fiber cable base 1 is installed at the exit of the through hole 9 of the steel sleeve.
1, the optical cable 10 protruding from the steel sleeve 1 is firmly fixed to the steel sleeve 1 by the cap 11 and is protected, making it easy to use during overhead line work from wire extension to derailment and after installation. It has the effect of safely protecting the optical cable without damaging it.

In addition, the present invention provides a method for attaching the retainer fitting 1 to the retainer attachment part 6 when retaining the retainer.
6 is attached to the steel tower by connecting them with bolts and nuts, and since the tension is carried by the bolts rather than the screws, it is effective in safely withstanding the tension of overhead wires for many years.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of an optical fiber-containing overhead ground wire. FIG. 2 is a partially cutaway front view showing the state of the clamp during wire extension in the embodiment of the present invention. FIG. 3 is a top view of the wire extension cap shown in FIG. 2. Figure 4 is a diagram showing an example of the odor of the retainer used in the embodiment of the present invention. Figure A is a front view;
The mouth view is a top view. FIG. 5 is an enlarged view of the vicinity of the connection part of the cap for salmon wire shown in FIG. 2, where A is a longitudinal sectional view, the opening is a left side view of the cap, and C is a top view. 6th
The figures are views showing a wire tensioning fitting used in an embodiment of the present invention, in which figure A is a side view and figure A is a front view. FIG. 7 is a diagram showing an example of the state of the retaining part after being secured to the steel tower according to the embodiment of the present invention, particularly details of the optical cable take-out part;
The mouth view is a top view. 1... Steel sleeve, 2... Aluminum sleeve, 3... Jumper socket, 4
, 25... Cylindrical part, 5... Wire tension fitting attachment part, 6... Retainer odor attachment part, 7... Male thread for attaching wire extension cap, 7', 27' ...Female thread, 8...
...Wire insertion hole, 9...Through hole, 10...
Optical fiber cable, 11... Optical fiber cable base, 12... Protective mandrel, 13... Wire extension cap, 14... Protector, 15.
...Tension fittings, 16...Tension fittings, 17
...Divided protective collar, 18...Protective cap, 19...Terminal section, 20...Overhead ground wire with optical fiber (electrical wire), 21...・Twisted wire,
22...Metal edge or composite wire, 23,43...
・Bolts, nuts, 24...Electric wire connections, 26
...Insertion hole, 27...Female thread, 28...
... Sleeve with tapered inner surface, 29 ... Sleeve with tapered outer surface and split, 30 ... Rear end surface, 31 ... Screw-in fitting, 32 ... Protective cover, 33...7 tube with par, 4
7...Protective pipe. O diagram 2 diagram power 3 diagram O 4 diagram soup 5 diagram soup 6 diagram soup 7 diagram

Claims (1)

[Scope of Claims] 1. As shown in the drawings, an aluminum sleeve 2 has a cylindrical portion 4 to which a jumper socket 3 is attached, and a wire tension fitting attachment portion 5 is attached to the end of the steel sleeve 1 inserted from the inside from the inside.
, a retaining fitting attachment part 6 and a male screw 7 for attaching a wire extension cap are provided, and a through hole 9 is provided for guiding the optical fiber cable 10 from the bottom of the wire insertion hole 8 to the terminal, and an optical fiber is provided at the exit of the through hole 9. Using the steel sleeve 1 to which the cable cap 11 is attached, first, the optical fiber cable 10 is exposed and the steps are stripped between the twisted wires 21 of the terminal portion 19 of the optical fiber-containing overhead ground wire 20 and the optical fiber cable 10. Insert the protective mandrel 12 and compressively connect the end portion 19 to the steel sleeve 1, then cover it with the aluminum sleeve 2 and compressively connect it, screw the wire drawing cap 13 into the male mounting thread 7, Said aluminum sleeve 2
After attaching the protector 14 to the steel sleeve 1 and stretching the wire, remove the protector 14, attach the tension fitting 15 to the tension fitting attachment part 5, apply tension to it, and then An extension of an overhead ground wire containing optical fiber, characterized in that the cap 13 is removed, the tie fitting 16 is connected to the tie fitting attachment part 6 with a bottle and a nut, and then attached to the steel tower, and then the tension fitting 15 is removed. , detention method. 2 When extending the line, a split type protective collar 17 is attached to the cable tension fitting attachment part 5.
A method for extending and tying an overhead ground wire containing optical fiber according to claim 1.