JPH0926533A - Leakage coaxial cable with pipe for passing optical unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the disconnection of a pipe for passing optical fibers and a leakage coaxial cable and to suppress the vibration by a wind pressure by successively arranging the leakage coaxial cable, a supporting wire and the pipe for passing an optical unit from below to above. SOLUTION: The leakage coaxial cable (LCX cable) 2, the supporting wire 1 and the pipe 3 for passing the optical unit are successively arranged from below to above and are commonly covered with a plastic sheath 5. At this time, the supporting wire 1, the LCX cable 2 and the pipe 3 are so arranged that their respective centers exist on the same straight line. Namely, the leakage coaxial cable with the pipe for passing the optical unit is arranged with the pipe 3 in the upper part of the supporting wire 1 and the leakage coaxial cable 2 in the lower part of the supporting wire 1, respectively, and therefore, the fixing of the supporting wire 1 and the pipe 3 by stopping studs and the member which is not supported is only the leakage coaxial cable 2. the cable is hardly oscillated even if the cable receives the strong wind pressure and the easy sepn. of the leakage coaxial cable 2 is possible as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a place where ground waves are hard to reach, such as in a subway tunnel or an automobile tunnel.
Or, near a railroad track, for leaky coaxial cables used to secure wireless communication with moving bodies of trains and automobiles,
The present invention relates to a leaky coaxial cable with an optical unit transmitting pipe in which an optical unit transmitting pipe for transmitting an optical fiber for communication is combined.

[0002]

2. Description of the Related Art An optical unit transmission pipe for transmitting an optical fiber for communication is integrally formed with a leaky coaxial cable (LCX cable) laid in a subway tunnel, an automobile tunnel, or near a railway line. When converted to LC
This is convenient because it is not necessary to lay an optical unit transmission pipe when installing or adding a communication line using an optical fiber in a subway tunnel or an automobile tunnel after laying the X cable. For this reason, the conventional LC
An LCX cable with a pipe has been developed in which a pipe for transmitting an optical unit is integrated with the X cable from the beginning.
Conventionally, there have been the following technologies related to this.

.. As shown in FIG. 3, LCX cable A
And a supporting wire C supporting the cable A, a pipe D for transmitting an optical fiber is arranged, and these are commonly covered with a sheath E of plastic or the like, and LC with a pipe is provided.
X cable G (Self-supporting aerial cable of Kaikaihei 1-155214). . As shown in FIG. 4, an LC having a support line C arranged on the upper side thereof
A pipe D for transmitting an optical fiber is arranged under the X cable A, and a sheath E made of plastic or the like is attached to the pipe D.
A common LCX cable G with a pipe.

[0004] As shown in FIG. 5, L is provided below the support line C.
A CX cable A is arranged, a pipe D for transmitting an optical fiber is arranged below the CX cable A, and these are fixed with a fixing piece F at a predetermined interval to form an LCX cable G with a pipe (actual open flat plate 2). -13211 self-supporting optical cable). . Although not shown in the drawings, there is also a pipe-equipped LCX cable in which the support line C, the LCX cable A, and the pipe D are put together by a lashing wire (spiral bind wire).

[0005]

When the LCX cable G with a pipe as described above is used for wireless communication of a train, for example, the cable G is used in consideration of the electric field strength and the site.
It will be laid near the train track as shown in.
In this case, the cable G laid near the line receives a large wind pressure each time the train passes, and the wind pressure causes vibration. However, if this vibration is large, the metallic material inside the cable G causes fatigue failure. It is important to prevent the cable G from vibrating as much as possible even if it receives wind pressure.

However, in the LCX cable G with a pipe shown in FIGS. 3 to 5, since the support line C is at the uppermost part and the LCX cable A and the pipe D are below the support line C, a hanging metal fitting K (a metal fitting for hanging the cable G). Since only the support line C is held by, the other LCX cable A and pipe D
When a train passes by, it is subject to the wind pressure and sways greatly, and the above problems are likely to occur.

In the LCX cable G with a pipe, the LCX
When connecting cable A to another cable, LCX
When the cable A and the pipe D are individually branched, it is necessary to separate the LCX cable A and the pipe D. However, the cable G of FIGS. 3 to 5 has the following problems with respect to this disconnecting work.

[0008] In the cable G of FIG. 3, when the pipe D is separated, the pipe D is connected to the support line C and the LCX cable A.
Since it is located between and, the joints H and I on both the upper and lower sides of the pipe D must be cut, and workability is poor. Moreover, since the LCX cable A is also disconnected when the pipe D is disconnected, it is necessary to connect the separated LCX cable A to the support line C by some means.

[0009] In the cable G of FIG. 4, when disconnecting the LCX cable A, since the LCX cable A is between the support line C and the pipe D, the joints H and I on both upper and lower sides of the LCX cable A must be cut. The workability is not good. Moreover, since the pipe D is also disconnected when the LCX cable A is disconnected, it is necessary to connect the separated pipe D to the support line C by some means.

[0010] In the cable G of FIG. 5, when the fixing piece F is cut, both the LCX cable A and the pipe D are separated from the support line C, so it is not convenient to disconnect only one of them. This is also the case for the cable bundled with the lashing wire described above.

It is an object of the present invention to easily install or expand an optical fiber, to easily disconnect a pipe for transmitting an optical fiber and a leaky simultaneous cable, and to provide a pipe for transmitting an optical unit in which vibration due to wind pressure does not easily occur. It is to provide a leaky coaxial cable.

[0012]

As shown in FIG. 1, a leaky coaxial cable with an optical unit transmitting pipe according to the present invention has a support wire 1, a leaky coaxial cable 2 and an optical unit transmitting pipe 3 which are commonly covered. The leaky coaxial cable with a pipe for transmitting an optical unit is characterized in that a leaky coaxial cable 2, a supporting wire 1, and a pipe 3 for transmitting an optical unit are sequentially arranged from the bottom to the top.

[0013]

In the leaky coaxial cable with a pipe for transmitting an optical unit according to the present invention, since the pipe 3 is arranged above the support line 1 and the leaky coaxial cable 2 is arranged below the support line 1, the support line 1 and the pipe are arranged. Since 3 can be fixed with a stopper and only the leaky coaxial cable 2 is not supported, even if it is installed near the railroad track of a train that receives strong wind pressure, the cable is less likely to shake compared to the conventional one, and it is Fatigue failure is less likely to occur. Further, the leaky coaxial cable 2 can be easily separated only by disconnecting the connecting portion 15 between the leaky coaxial cable 2 and the supporting wire 1, and the connecting portion 16 between the pipe 3 and the supporting wire 1 can be easily separated.
The pipe 3 can be easily separated simply by disconnecting.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of a leaky coaxial cable with a pipe for transmitting an optical unit of the present invention will be described in detail with reference to FIGS. In the figure, 2 is a leaky coaxial cable (LCX cable), 1 is a support line, 3 is a pipe for transmitting an optical unit, these are arranged in order from bottom to top, and are commonly covered with a plastic sheath 5. ing. At this time, the support line 1, the LCX cable 2, and the pipe 3
Are arranged such that their centers are located on the same straight line.

The support wire 1 is also called a suspension wire or a messenger wire, and for this, for example, a stranded wire of galvanized steel wire is used.

The LCX cable 2 includes a central conductor 10, an inner insulator 11 formed by spirally forming a square polyethylene string in a spiral shape, an outer insulator 12 such as a polyethylene pipe, and a metal in order from the central portion toward the outer peripheral side. The outer conductor 13 is made of.

As shown by the broken line in FIG. 2, the outer conductor 13 has a plurality of slit-shaped slots (grooves) 14 formed in the circumferential wall in the circumferential direction, for example, obliquely and at even intervals. The signal transmitted from the center conductor 10 to the center conductor 10 is leaked to the outside.

The pipe 3 for transmitting the optical unit is arranged immediately above the LCX cable 2 (immediately above the support line 1), and the pipe 3 is used so that the optical fiber is fed under pressure together with compressed air or the like. It is hollow, and plastic pipes such as polyethylene pipes are used for it.

[0019]

Example of use of the present invention The leaky coaxial cable with a pipe for transmitting an optical unit of the present invention is laid along the longitudinal direction in an underground cavern or tunnel as in the conventional case. At this time, as shown in FIG. 2, the supporting wire 1 above the LCX cable 2 and an arbitrary portion in the longitudinal direction of the pipe 3 are supported by the hanging metal fitting 20 and are hung.

[0020]

The leaky coaxial cable with a pipe for transmitting an optical unit of the present invention has the following effects. . Since the support wire 1 and the pipe 3 are located above the leaky coaxial cable 2 in this order, the support wire 1 and the pipe 3 are supported by the hanging metal fitting 20 as shown in FIG. Vibration is suppressed, leading to prevention of fatigue damage to the leaky coaxial cable. . Since the leaky coaxial cable 2 is arranged at the lowermost stage, the leaky coaxial cable 2 can be easily separated by disconnecting the connecting portion 15 between the support line 1 and the leaky coaxial cable 2. . Since the pipe 3 is arranged at the uppermost end, the support line 1
The pipe 3 can be easily separated by disconnecting the connecting portion 16 of the pipe 3 and the pipe 3.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a leaky coaxial cable with a pipe for transmitting an optical unit of the present invention.

FIG. 2 is a perspective view showing an embodiment of a leaky coaxial cable with a pipe for transmitting an optical unit of the present invention.

FIG. 3 is a perspective view showing a first example of a conventional leaky coaxial cable with a pipe for transmitting an optical unit.

FIG. 4 is a perspective view showing a second example of a conventional leaky coaxial cable with a pipe for transmitting an optical unit.

FIG. 5 is a side view showing a third example of a conventional leaky coaxial cable with a pipe for transmitting an optical unit.

FIG. 6 is a schematic view showing an example of use of a leaky coaxial cable with a pipe for transmitting an optical unit.

[Explanation of symbols]

 1 Support line 2 Leaky coaxial cable 3 Pipe for transmitting optical unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Yubara 2-4-24 Shibata, Kita-ku, Osaka City, Osaka Prefecture West Japan Railway Company (72) Inventor Yosuke Ikeda 2-chome, Shibata, Kita-ku, Osaka City, Osaka Prefecture 4-24 West Nishi Passenger Railway Co., Ltd. (72) Inventor Kaku Hirano 2-4-24 Shibata Kita-ku, Osaka City, Osaka Prefecture West Nishi Passenger Railroad Co., Ltd.

Claims (1)

[Claims] 1. A leaky coaxial cable with a pipe for transmitting an optical unit, comprising a support wire (1), a leaky coaxial cable (2), and a pipe (3) for transmitting an optical unit, which is a common coating. ), A supporting wire (1), and a pipe (3) for transmitting an optical unit are sequentially arranged from the bottom to the top, and a leaky coaxial cable with a pipe for transmitting an optical unit.