JPS60189716A - Formation of lead-out part at steel tower position of optical cable laid in overhead earth wire - Google Patents

Abstract

PURPOSE:To detect and obtain information from an optional steel tower part through a sensor, etc., by disconnecting the overhead earth wire of a jumper part, replacing a right- and a left-side optical cable with a long-sized cable and providing an excessive-length part, and leading and connecting the cable in and to an optical cable connection box through a watertight connection part. CONSTITUTION:The overhead earth wire 2 is extended among >=3 steel towers and jumper parts 2A of the overhead earth wire 2 are formed between steel towers. The overhead earth wire 2 of the jumper part 2A of, for example, a steel tower 1A is cut at its nearly center part and existent optical cables 9 are led out from the right and left overhead earth wires 2 to insert new optical cables 12 with extra length respectively. Then, the metallic pipe 8 of the overhead earth wire 2 and an end part of a protection pipe which is set up are connected mutually through a watertight structure part and a protection pipe 8 and the extra-length part of the optical cable 12 inserted into it are led in the optical fiber cable connection box 3C to form a lead-out part at the steel tower position of the optical fiber.

Description

Detailed Description of the Invention The present invention provides an overhead ground line in which an overhead ground wire is stretched across three or more steel towers, and a jumper portion of the overhead ground wire is formed in a portion of the tower located in the middle. The present invention relates to a method for forming an optical cable lead-out portion for pulling out an optical cable installed in the overhead ground wire from the inside of the overhead ground wire to the outside at the jumper portion (steel tower portion).

Optical cables can transmit information over large distances, as well as have low loss and
It has many advantages not found in conventional communication cables using electrical conductors, such as being non-inductive and an insulator. Therefore, in recent years, optical fiber transmission systems, which incorporate optical cables into power transmission line networks and perform various data transmissions, have been put into practical use. In this case, optical cable composite overhead ground wires, in which optical cables are combined with overhead ground wires, have been attracting attention because they can simplify the system and are advantageous in terms of economy and maintenance. be.

Generally, as shown in Figure 1, an overhead ground wire that is a combination of optical cables has three junction boxes (sections) for optical cables, one for each several towers, one for each tower.
There are two jumpers for an overhead ground wire having junction boxes 3A and 3B, and various sensors 6 such as a lightning detector, a reclining direction sensor, an anemometer, a thermometer, an I
A TV or the like is installed, and various information obtained by these is transferred to the optical cable combined in the overhead ground wire 2 through the optical cable connection boxes 3A and 3B, and data is transmitted by the optical cable.

However, in the overhead ground line shown in Figure 1,
In a steel tower where only a jumper part 2A is formed, for example, in a steel tower IA, there is no optical cable junction box 3, so even if a sensor is installed near the steel tower IAA to detect various information, it is not possible to Data transmission cannot be carried out on the optical cable line within the ground line 2, which causes inconvenience.

The present invention has been made in view of the above-mentioned points, and the present invention has been made in the jumper section of the overhead ground wire in a steel tower section that does not have an optical cable junction box, by pulling out the optical cable outside from within the overhead ground wire of the jumper section, and connecting the optical cable to the outside. In other words, the optical cable in the overhead ground wire is pulled out at the tower location so that it can be introduced into the junction box, and in other words, various information can be detected from any tower part by sensors etc. as necessary and obtained as needed. The present invention provides a method for forming a part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In an existing railway line as shown in FIG. To explain the procedure for pulling out the optical cable from the overhead ground wire 2 yen and forming the pull-out part as shown in Figure 2, first, the two jumper parts of the tower IA shown in Figure 3 ((A)) are connected. Figure 3 shows approximately the center part (→
Cut as shown. Note that 4 is a retaining clamp for supporting the overhead ground wire 2 to the steel tower via a tension support (not shown). Next, as shown in FIG. 4, if the optical cable 9 is already laid and accommodated in the metal pipe 8 at the center of the overhead ground wire 2 made of stranded wires 10, the steel towers 1 at both ends shown in FIG. At the same time as disconnecting the existing optical cable 9 at the junction box (section) 3A, 3B,
2, and pull out the existing optical cable 9 from inside the right overhead ground wire 2 and the left overhead ground wire 2 at each end of the two jumper sections. Next, a new optical cable 12 that is longer than the optical cable 9 that was pulled out is inserted into the empty metal pipe 8 of each of the overhead ground wires 2, and one end of the optical cable 12 is connected to the jumper section of the overhead ground wire 2. An extra length portion 12A having a desired length is provided by two people by extending it to the outside as shown in FIG. 3(c).

Next, as shown in FIG. 3), the extra length 12A of the optical cable 12 is inserted into the protective pipe 13A of the separately prepared drawer protection tube 13, and then the metal pipe 8 of the overhead ground wire 2 and the protective As shown in FIG. 5 or 6, the ends of the pipes 13A are mutually connected to the watertight structure 11 to form a watertight connection part 14, and the protection pipe 13A and the optical cable 120 inserted therein are connected to each other to form a watertight connection part 14.
The extra length portion 12A is introduced into an optical cable connection box 3C installed at an appropriate location on the tower to form a pull-out portion at the tower location of the optical cable laid within the overhead ground wire as shown in FIG.

In other words, the two jumpers at the tower IA shown in Figure 1 are converted into two jumpers who introduce the optical cable in the overhead ground wire z to the optical cable junction box 3C as shown in Figure 2. . Therefore, the above optical cable connection box 3C
In addition, by sending the information detected by the sensor 6 through the signal line 7, it is now possible to transmit various information such as weather observation data in the vicinity of the steel tower 'IA' on the optical cable line, which was previously possible. Become.

In addition, in FIG. 7 (FIG. 2), when the sensor 6 emits an optical signal and the signal line 7 is an optical cable, the optical cable 12 and the signal line 7 are directly connected. However, if the sensor 6 emits an electric signal and the signal line 7 is an electric wire, an electric-to-optical converter is provided in the optical cable junction box 3C, and the signal line 7 is connected via this electric-to-optical converter. and the optical cable 12 are indirectly connected. In addition, electricity-
An optical converter is installed at the bottom of the tower, and the optical cable is separately lowered from the optical cable connection box 3C to the bottom of the tower, and the signal line 7
may be lowered to the bottom of the tower, and both may be connected by an electrical-to-optical converter.

Further, although the protection pipe 13A in the above embodiment is covered with the eel protection pipe 13, it may be a hard metal pipe or the like that does not have the eel protection pipe 13.

Here, the above-mentioned method of the embodiment is for a line in which the optical cable 9 is already combined in the metal pipe 8 at the center of the overhead ground wire 2. Therefore, in the method of the above-mentioned embodiment, the third After the process shown in Figure (b), the overhead ground wire 2
Although the existing optical cable 9 is pulled out from inside, the present invention can also be applied to a line as shown in FIG. 1 where an optical cable is not integrated within the metal pipe 8 of the overhead ground wire 2.

That is, in the case of an overhead ground line in which an optical cable is not combined in the metal pipe 8 of the overhead ground wire 2, a lead wire 9 is generally installed in the metal pipe 8 of the overhead ground wire 2 shown in FIG. 4 instead of the optical cable. is inserted in advance, so in the case of such a line, after the process shown in FIG. The lead wire 9 is pulled out from each cut end of the person, and the optical cable 12 to be laid is drawn into the metal pipe 8 of the overhead ground wire 2.Then, the tip of the optical cable 12 is connected as in the previous embodiment. In other words, as shown in FIG. 3(C), each jumper section is extended from the cut ends of the two members to the outside to provide an extra length section 12A of a desired length. Through the same procedure and process, a drawer part as shown in FIG. 7 is finally formed.

Note that if the lead wire 9 is not inserted into the metal pipe 8 of the overhead ground wire 2, the step of inserting the lead wire 9 into the metal pipe 8 is performed after the step shown in FIG. 3(b). After that, the same procedures and steps as described above are carried out.

As described above, according to the method of the present invention, it is possible to collect various information by installing power in the jumper part and the tower part of the overhead ground wire, and connecting the optical cable 12 in the overhead ground wire 2 to the phosphorescent cable junction box 3. It can be converted into a jumper section with a structure that is connected to the installation, and it can be used to detect weather observation data and other various information at any tower section as needed, and transmit it to the optical cable in the overhead ground wire. This enables smooth data transmission. In addition, since the length of the extra length 12A of the optical cable extending to the outside from the cut ends of the two jumpers can be freely selected, the installation location of the optical cable junction box 3 can be determined arbitrarily. , and the metal pipe 8 exposed from within the overhead ground wire 2 and the protective pipe 13A introduced into the optical cable junction box 3 are connected in a watertight manner.
This allows the extra length 12A of the optical cable to be reliably kept in a state where there is no possibility of foreign matter or water entering.

[Brief explanation of the drawing]

Fig. 1 is a simplified side view showing an existing overhead ground line, and Fig. 2 is a simplified side view showing a state in which an optical cable pull-out part is formed by applying the method of the present invention to a part of the jumper part of the line in Fig. 1. , Fig. 3 (a) to d) are explanatory diagrams showing the steps of the method of the present invention, Fig. 4 is a cross-sectional view showing an example of an overhead ground wire to which the method of the present invention is applied, and the tJcS diagram is A partially cutaway side view showing an example of a watertight connection between a metal pipe exposed from inside the overhead ground wire and a protection pipe introduced into an optical cable junction box. Figure 6 shows the same connection as Figure 5. FIG. 7 is a partially cutaway side view showing another example of the part, and FIG. 7 is a schematic perspective view showing a structural example of the optical cable lead-out part formed by the method of the present invention. 1... Steel tower, 2... Overhead ground wire, 2A.
...Jumper section, 3A, 3B, 3C...
Optical cable connection box, 8...Metal pipe, 12.
...Optical cable, 12A...Extra length, 1
3A...Protection pipe. Figure 3 (a) Figure 5

Claims (1)

[Claims] An overhead ground wire (2) is stretched across three or more steel towers (1), and a jumper section (2 people) of the overhead ground wire (2) is formed on the tower located in the middle. In the ground line, there is a step of cutting the overhead ground wire (2) of the jumper part (2'A) at approximately the center thereof, and cutting inside the metal pipe (8) of the overhead ground wire (2) on each side of the cut. Optical cable (
12) and extending one end of each optical cable (12) inserted into the metal pipe (8) from the jumper section (2 people) of the cut overhead ground wire (2) to the outside. A process of making the extra length part (12A) come out and providing an appropriate length of the extra length part (12A), and a process of making the extra length part (12A) separately prepared.
3A), a step of connecting the metal pipe (8) of the overhead ground wire (2) and the protection pipe (13A) in an airtight state, and a step of inserting the metal pipe (13A) into the protection pipe (13A) and the protection pipe (13A). A method for forming a lead-out portion of an optical cable installed in an overhead ground wire at a pylon location, the method comprising the step of introducing an optical cable (12), which has been installed, into an optical cable connection box (3C).