JPS62189906A - Termination of optical fiber cable combined with overhead grounding wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to the end of an original fiber cable, such as connecting the end of an optical fiber cable combined with an overhead ground wire to a connector installed on a steel tower. Regarding the construction method number of the department.

[Prior art and its problems]

Conventionally, various optical fiber composite overhead ground wires in which an original fiber cable is combined with an overhead ground wire have been proposed.

FIG. 3 shows an example of such an optical fiber composite overhead ground wire. Metal wires such as aluminum coated and steel wires 3.
... are twisted to form a twist a1m4... of 11d or more, and the optical fiber cable 5 is pushed through the protective vibe 2, and the above twisted wire J-4... connects the overhead ground wire. It consists of Further, the optical fiber cable 5 has a fourth
As shown in the figure, six metallic tension members such as steel wire or galvanized metal are twisted together with multiple optical fibers or core wires 7 (in some cases, dummy wires 8 are mixed). The sheath 9 is made of a synthetic resin such as nylon and is then ruptured all at once.

By the way, when carrying out work such as connecting the end of the original fiber cable 5 combined with such an overhead ground wire 4 to a connector installed on a steel tower, it is necessary to install a live wire near the above-mentioned overhead ground wire. If an overhead power transmission line exists in the state, a 4% current is induced in the metallic tension member 6 of the optical fiber cable 5, so that the optical fiber cable 5
There is a problem in that there is a risk that a worker may touch the metallic tension member 6 and receive an electric shock when handling the metallic tension member 6.

[Problem 'f: Means to solve]

Therefore, in this invention, a metal tension member in the original fiber cable is electrically connected to the overhead ground wire to bring the tension member to the same potential as the overhead ground wire, so that a person can connect to this tension member. It is designed to prevent electric shock even if touched, thereby improving the workability of connecting the ends of optical fiber cables, etc.

[Actual example]

FIG. 1 is for explaining a first example of the method according to the present invention, in which reference numeral 1 denotes an optical fiber composite ground leased line, 2
3 is a protective pipe, 3 is a metal wire, 4 is a twisted m/1!1.5 optical fiber cable, 6 is a metallic tension member, and 7 is an original fiber wire or core wire.

To connect the end of the original fiber cable 5 to a connector installed on a steel tower, for example, first connect the end of the overhead ground wire 1, which is strung together and tension-supported on the steel tower, as shown in FIG. Interject as indicated. Next, the aluminum protection pipe 2 at the opening and the tension member 6 are electrically connected using a conduction jig 10 to bring them both to the same potential.

The conduction jig 10 includes a metal gt clamp 11 such as a clip that grips the tension member 6 in a removable manner;
It consists of a second metal clamp 12 such as a clip that detachably holds the protective pipe 2, and a conductive wire 13 that connects these ml and the second clamp.

By connecting the two through the conduction jig 10 so that the tension member 6 and the maintenance pipe 2 have the same potential as shown in the upper d pipe, the visiting flow induced in the tension member 6 is reduced to the maintenance vibration. 2, flows to the twisted wire layer 4, and is grounded.

Next, in this state, work φ such as connection work of the original fiber wire or core wire 7 . . . of the tapped optical fiber cable 5 to a connector is performed. At this time, even if the worker touches the tension member 6, since the tension member 6 is in the state of grounding the ship, the worker will no longer be affected by the induced torrent, and this will prevent an accident. It is possible to carry out work on the 1/1iii section of the optical fiber cable, such as connection work, without fear of damage. After completing the work on the desired end of the optical fiber cable, the continuity jig 10 is removed.

FIG. 2 is for explaining another example of the method according to the invention. In this example, the second
This embodiment differs from the previous example in that the clamp 12 directly holds the stranded wire layer 4 in a removable manner so that the tension member 6 and the stranded wire layer 4 are directly electrically connected.

[Effect]

According to the method of the present invention, the conduction jig 10 causes the induced current induced in the tension member 6 to flow through the layer 4 and the twist # forming the aerial ground to the ground. The pressure disappears, so you won't feel it even if you touch it.
It is something that never goes away. Therefore, the original fiber cable and core wire 7...Mj! Various types of work on the ends of optical fiber cables, such as connection of the tension member 6 or maintenance and inspection of these connections, can be carried out safely and quickly. Also, clip type conduction jig 10? If used, the conduction work between the tension member 6 and the twisted wire no. 4 or the protection pipe 2 can be easily and quickly performed.

Note that when electrically connecting the tension member 67 with the protective vibrator 2 or the twisted wire layer 4, the electrically conductive jig 10 of the illustrated example is not necessarily used.
It is needless to say that there is no need to use an appropriate conductive wire to connect the tension member 6 and the tension pipe 2 or the stranded wire layer 4 as appropriate.

〔Effect of the invention〕

As explained above, in the method of the present invention, the metal tension member of the original fiber cable and the stranded gold bullion wire are electrically connected to each other, and then the end portion of the original fiber cable is constructed. Therefore, even if there is a live overhead power transmission line, induced voltage will not occur in the tension member, and therefore, the risk of workers touching the tension member fc and causing it to become overweight is reliably eliminated. This allows construction work to be carried out easily and quickly.

[Brief explanation of drawings]

8 and 2 are explanatory diagrams for explaining the method of constructing the end of an optical fiber cable to be combined with the aerial edge of this invention, and FIG. A schematic cross-sectional view showing an example of the ground line, Figure 4 is the 3rd
FIG. 8 is a schematic cross-sectional view of the optical fiber cable portion shown in FIG. ■・・・・Optical fiber composite overhead ground wire, 2・・・・・
・Protection pipe, 4...Twisted wire 41.5...
- Optical fiber cable, 6...Metallic tension member, 10...Continuity jig.

Claims (1)

[Claims] An overhead ground wire characterized in that work is carried out on the end of the optical fiber cable after the metal tension member in the optical fiber cable combined with the overhead ground wire is brought to the same electrical potential as the overhead ground wire. A construction method for the end of an optical fiber cable that can be combined into a fiber optic cable.