JPS6116748Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compression type retaining clamp for an overhead ground wire that encloses an optical fiber for information transmission, and more particularly to a means for protecting the lead-out portion of an optical fiber cable.

In recent years, in the field of overhead power transmission, as the capacity of power transmission increases, power generation and substation facilities become larger and more remote, and communication lines for transmitting information tend to be multiplexed.

In order to cope with this increase in information capacity, it is possible to encapsulate an optical fiber cable that is not susceptible to radio wave interference and can handle multiple lines in the overhead ground wire, thereby eliminating the need to install a separate communication cable.

FIG. 1 is a cross-sectional view showing an example of this optical fiber-containing overhead ground wire, and 21 is a metal wire or composite wire 22 such as a plurality of aluminum or aluminum alloy wires, aluminum-coated steel wires, or galvanized steel wires. An optical fiber cable 23 is enclosed in the center of the stranded wire instead of a wire, thereby forming an optical fiber-containing overhead ground wire 20.

In the present invention, an optical fiber cable (hereinafter referred to as an optical cable) is a wire that has one or more optical communication fibers (glass fibers) as a core and is coated with synthetic resin or the like, or If necessary, cover the cable with a metal pipe or cushioning material on the outside of this line (first
(see figure).

In a detention tower having such an optical fiber-containing overhead ground wire 20, as shown in an example in FIG. 2
At the same time, the ends of the optical cables 23, 23 pulled out from the retaining clamps 1, 1 are connected to the optical fiber cable joint box 25.

When the optical cable 23 is pulled out from the retaining clamp 1 in this manner, the optical cable is weak in strength and may be damaged by collision with other foreign objects, lightning damage, etc.

The present invention aims to provide an appropriate structure for the optical fiber-containing overhead ground wire retaining clamp, which has the above-mentioned problems, and is designed to prevent damage to the optical cable, especially at the part where the optical cable is pulled out from the retaining clamp. The purpose is to provide protective equipment.

As shown in an embodiment in FIGS. 3 and 4, the present invention provides a steel clamp 2 having a hole 30 for drawing out an optical fiber cable, which connects the terminal end of an overhead ground wire by compression, and It consists of an aluminum clamp 3 that covers the outer periphery and connects to the jumper wire.
The steel clamp 2 connects the optical fiber cable 23 protruding from the end of the ground wire to the hole 3.
0, an insertion hole 5 with a screw 6 is provided at the outlet of the hole side of the through hole 4, and an optical fiber cable base 7 is screwed into the insertion hole 5. The optical fiber cable base 7 is
As shown in an embodiment in FIG. 5, a flange consisting of a pipe portion 10 of a predetermined length through which an optical fiber cable 23 pulled out to a flange portion 9 in contact with the inner surface of the insertion hole 5 is guided. a protective pipe 8, a tapered sleeve 11 whose end surface 33 on the small hole side is in contact with the flange portion 9, a restraining sleeve 12 with a crack inserted into the tapered inner surface of the tapered sleeve 11, and a washer in contact with the end surface of the restraining sleeve 12. 13, and a threaded fitting 14 configured to press the rear end of the holding sleeve 12 through the washer 13 by screwing into the thread 6 on the inner surface of the insertion hole 5. This is a retaining clamp for overhead ground wires.

The optical fiber-containing overhead ground wire using the tie clamp according to the present invention is not limited to the structure shown in FIG.

Fig. 3 shows an embodiment of the present invention, Fig. 3 is a side view showing the whole of the dead-end clamp, Fig. 2 is a side view showing the protective core bar shown in Fig. 2, and Fig. 3 is a side view showing the terminal part of the overhead ground wire. In the figure, the terminal part of the overhead ground wire 20 with optical fiber is stripped in a step as shown in Fig. 2, leaving the central optical cable 23, and the protective core bar 15 shown in Fig. 2 is inserted between the optical cable 23 and the stranded wire 21 as shown in Fig. 2 to prevent damage to the optical cable, and after it is inserted into the steel sleeve part 18 of the steel clamp 2, the outer surface of the steel sleeve 18 is compressed to connect it. The aluminum clamp 3 is placed on the compressed steel sleeve part 18, and the outer surface is compressed to fix the aluminum clamp 3 and the steel clamp 2. A jumper socket 27 to which a jumper wire is compressed is connected to the branch part 19 of the aluminum clamp 3 by a bolt.

The steel clamp 2 is provided with a through hole 4 that guides the optical cable 23 from the back of the wire insertion hole of the steel sleeve portion 18 to the cavity 30, and an optical fiber cable base 7 is provided at the exit of the cavity side. An insertion hole 5 is provided which is fitted and screwed. Insertion hole 5
A female thread 6 is provided on the inner surface of the outlet side, into which a cap 7 is screwed.

FIG. 5 is a diagram showing this optical cable base 7.
Figure A is a vertical cross-sectional view showing the state assembled into a steel clamp, Figure B is a right side view of the base, Figure C is the washer with the bushing shown in Figure A, Figure D is the same tapered sleeve, and Figure E is the same with the split. The restraining sleeve and FIG.

In the figure, the insertion hole 5 of the steel clamp 2 has three steps with diameters gradually decreasing toward the inner part. The optical cable cap 7 includes, from the back, a washer 16 with a bushing, a washer 17, a protective pipe 8 with a flange, a tapered sleeve 11, a restraining sleeve 12 with a crack, a washer 13, and a screw fitting 14.
is located. Each part has a structure as shown in Figures B to F, and has the following functions.

The washer 16 with bushing is as shown in Fig.
It has a bushing part 31, is inserted in contact with the innermost part of the insertion hole 5, and guides the optical cable 23.
A washer 17 is placed in contact with this, and the flange portion 9 of the flanged protection pipe 8 is applied. The washer 16 with bushing and the washer 17 are for stably placing the flange portion 9 against the back surface of the insertion hole 5, but they are not necessarily necessary, and the flange portion 9 may be placed directly against the back surface of the insertion hole 5. It's fine, or you can use only one of the washers.

As shown in Figure F, the flanged protection pipe 8 is used to guide and protect the optical cable through which it is passed, and has a predetermined length, that is, the length necessary to protect the optical cable from obstacles, foreign objects, lightning damage, etc. It has a pipe section 10 and is bent along its passage. This protective pipe 8 is made of a metal pipe such as aluminum, aluminum alloy, or galvanized iron. For example, the pipe is cut to a predetermined length, and the flange portion 9 is easily formed on site using a suitable flange forming tool. Can be molded and easily created.

Next, the tapered sleeve 11 has a tapered portion 32 on its inner surface, and is placed over the protective pipe 8 so that its end surface 33 on the side of the small hole is in contact with the flange portion 9 of the protective pipe 8.

The cracked restraining sleeve 12 to be inserted into the tapered portion 32 has a tapered portion 34 having the same taper as the tapered portion 32 of the tapered sleeve 11 on the outer surface, as shown in Fig. E, and has one crack 35.
has been established. As a result, when the restraining sleeve 12 is inserted and pushed into the tapered sleeve 11,
The crack 35 is closed, and the protective pipe 8 can be firmly gripped.

Next, the screw fitting 14 slides and supports the outer surface of the tapered sleeve 11, as shown in FIGS.
This pressing is performed by screwing the external thread 6' of the screw-in fitting 14 into the internal thread 6 of the insertion hole 5 of the steel clamp 2. 36 is a nut that fits into the screw 6';
This is for fixing the screw fitting 14. In addition,
The washer 13 facilitates the rotation of the screw-in fitting 14 during screwing.

With this configuration, the flanged protection pipe 8 that protects the optical cable 23 pulled out from the retaining clamp 1 can be firmly fixed to the steel clamp 2.

Next, the shape of the steel clamp 2 used in the compression type retaining clamp of the present invention may be of the usual type, for example, as shown in FIG. Can be done. 2
9 is a clevis part, which is connected to the steel tower.

In this case, if it is troublesome or difficult to provide the threaded insertion hole 5 for inserting the optical cable base in the steel clamp 2 having a complicated shape,
For example, by forming the steel clamp 2 into a split type as shown in FIG. 4, cutting of the insertion hole 5 in the split parts becomes easy, and manufacturing can be facilitated.

FIG. 4 is a diagram showing an example of a split type steel clamp according to another embodiment of the present invention, where A is a top view and B is a side view. In the figure, the same reference numerals as in FIG. 3 indicate the same parts. In the figure, steel clamp 2
is divided on the outside of the threaded insertion hole 5, and by connecting the U-shaped fitting 38 with the bolt 37,
Holes 30 are formed.

39 is connected to the steel tower at the clevis.

As mentioned above, the retaining clamp of the present invention is
In the compression type detention clamp, the steel clamp 2
The optical cable base comprises a through hole 4 for guiding the optical cable 23 as described above, and a threaded insertion hole 5 at the exit of the hole side, and an optical cable base 7 is screwed into the insertion hole 5. 7 includes the above-mentioned flanged protection pipe 8, tapered sleeve 11, cracked restraining sleeve 12, washer 13, and screw fitting 14.
The optical cable 23 protruding from the compressed end of the optical fiber-containing overhead ground wire is pulled out without force through the through hole 4 and the flanged protection pipe 8 that follows it, and the optical cable 23 is guided through the through hole 4. The protective pipe 8 includes the above-mentioned taper sleeve 11, restraining sleeve 12, and washer 1.
3. Since the screw fitting 14 is firmly fixed to the threaded insertion hole 5 of the steel clevis 2, the optical cable pulled out from the retaining clamp is protected by the protection pipe 8 from collisions with obstacles, foreign objects, lightning damage, etc. This has the advantage of not damaging the optical cable and providing a very safe and suitable fiber optic overhead ground wire tie clamp.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of an optical fiber-containing overhead ground wire. FIG. 2 is a side view showing an example of a stop tower with an optical fiber-containing overhead ground wire attached thereto. Figure 3 is a diagram showing an embodiment of the present invention, where Figure A is a side view showing the entire retaining clamp, Figure B shows the protective mandrel shown in Figure A, and Figure C also shows the terminal part of the overhead ground wire. FIG. FIG. 4 is a diagram showing an example of a split type steel clamp according to another embodiment of the present invention, where A is a top view and B is a side view.
Figure 5 is a diagram showing a fiber optic cable cap according to an embodiment of the present invention. Figure A is a cross-sectional view showing the state assembled into a steel clevis, Figure B is a right side view of the base, and Figure C is a diagram of Figure A. Figure 2 is a longitudinal cross-sectional view showing a tapered sleeve, Figure E is a vertical cross-sectional view and cross-sectional view showing a restraining sleeve with cracks, and Figure F is a vertical cross-sectional view showing a protective pipe with a flange. It is. 1... Compression type retaining clamp, 2... Steel clamp, 3... Aluminum clamp, 4... Through hole, 5...
...Insertion hole, 6, 6'...Screw, 7...Optical fiber cable base, 8...Protection pipe with flange, 9...Flange part, 10...Pipe part, 11
... Taper sleeve, 12 ... Holding sleeve,
13... Washer, 14... Screw-in fitting, 1
5... core metal, 16... washer with butting, 17...
...Washer, 18... Steel sleeve part, 19... Branch part, 20... Overhead ground wire with optical fiber, 21...
...Twisted wire, 22...Metal wire or composite wire, 23...Optical fiber cable, 28...U-shaped clevis,
29, 39...clevis part, 30...hole, 33...
Small hole side end surface, 38...U-shaped fitting.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) As shown in the drawing, a steel clamp 2 having a hole 30 for pulling out an optical fiber cable and connecting the end portion of an overhead ground wire by compression, and the steel clamp 2
The steel clamp 2
is equipped with a through hole 4 for guiding the optical fiber cable 23 sticking out from the end of the ground wire into the hole 30, and an insertion hole with a screw 6 is provided at the hole side exit of the through hole 4. 5, the insertion hole 5
A fiber optic cable cap 7 is screwed into the fiber optic cable cap 7.
A flanged protection pipe 8 includes a flange portion 9 in contact with the inner surface of the insertion hole 5 and a pipe portion 10 of a predetermined length through which the pulled out optical fiber cable 23 is guided. A tapered sleeve 11 in contact with the hole side end surface 33, a restraining sleeve 12 with a crack inserted into the tapered inner surface of the tapered sleeve 11, and a washer 1 in contact with the end surface of the restraining sleeve 12.
3, and a screw-in metal fitting 14 configured to press the rear end of the holding sleeve 12 through the washer 13 by screwing into the screw 6 on the inner surface of the insertion hole 5. Retaining clamp for overhead ground wire. (2) The optical fiber-containing overhead ground wire retaining clamp according to claim (1), wherein the steel clamp 2 is divided on the outside of the threaded insertion hole 5 and connected by bolts. (3) Claims for Utility Model Registration in which a protective mandrel 15 is inserted between the optical fiber cable 23 and the stranded wire 21 at the terminal end of the overhead ground wire which is compressively connected to the steel sleeve portion 18 of the steel clamp 2. A retaining clamp for an overhead ground wire containing optical fiber as described in paragraph (1) or (2). (4) Utility model registration claims paragraphs (1) and (2) in which a washer 16 with a bushing and/or a washer 17 is provided between the inner surface of the insertion hole 5 and the flange portion 9 of the flanged protection pipe 8 Retaining clamp for overhead ground wire with optical fiber as described in paragraph or paragraph (3).