JP3378701B2 - Leaky coaxial cable with pipe for optical unit transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a place where terrestrial waves are difficult to reach, such as in a subway tunnel or a car tunnel.
Or near such a railway track, the leaky coaxial cable used to ensure <br/> wireless communication with a mobile trains and automobiles, light sending unit for through transmission optical fiber for communication Spoken The present invention relates to a leaky coaxial cable with a pipe for transmitting an optical unit in which the pipes are combined. 2. Description of the Related Art An optical unit for transmitting a communication optical fiber to a leaky coaxial cable (LCX cable) laid in a subway tunnel, an automobile tunnel, or near a railway track. If the pipe is integrated, LC
When a communication line using an optical fiber is newly installed or added in a subway tunnel or a car tunnel after the X cable is laid, it is convenient since it is not necessary to newly lay the optical unit transmission pipe. For this reason, conventional LC
An LCX cable with a pipe in which a pipe for transmitting an optical unit is integrated from the X cable from the beginning has been developed.
Conventionally, there have been the following related technologies. [0003] As shown in FIG. 3, a pipe D for transmitting an optical fiber is disposed between an LCX cable A and a support line C supporting the cable A, and these are commonly covered with a sheath E made of plastic or the like. LCX cable G with pipe
(Self-supporting overhead cable of Japanese Utility Model Laid-Open No. 1-155214). . As shown in FIG. 4, an LC having a support line C disposed thereon
At the lower part of the X cable A, a pipe D for transmitting an optical fiber is arranged, and these are connected to a sheath E made of plastic or the like.
And LCX cable G with a pipe. [0004] As shown in FIG. 5, the LCX cable A is disposed below the support line C, the pipe D for transmitting the optical fiber is disposed below the LCX cable A, and these are fixed at predetermined intervals by fixing pieces F. And an LCX cable G with a pipe (a self-supporting optical cable of Japanese Utility Model Laid-Open No. 2-13211). . In addition, although not shown, there is also an LCX cable with a pipe in which the support wire C, the LCX cable A, and the pipe D are collectively combined with a lashing wire (spiral bind wire). When the LCX cable G with a pipe as described above is used, for example, for wireless communication of a train, the cable G is connected with the cable G in FIG.
As shown in the figure, it will be laid near the train tracks.
In this case, the cable G laid in the vicinity of the track receives a large wind pressure every time the train passes and vibrates due to the wind pressure. If the vibration is large, the metal material inside the cable G causes fatigue fracture. It is important that the cable G does not vibrate 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, the support wire C is located at the top, and the LCX cable A and the pipe D are located below the support wire C. Therefore, the hanging bracket K (bracket for hanging the cable G) Since only the support wire C is held by the LCX cable A and the pipe D
Is greatly affected by the wind pressure when passing through the train, and the above problem is likely to occur. In the LCX cable G with a pipe, LCX
When connecting cable A to another cable, LCX
When the cable A and the pipe D are individually branched, the LCX cable A and the pipe D need to be separated. However, the cable G shown in FIGS. 3 to 5 has the following problem with respect to the disconnecting operation. [0008] In the cable G of FIG. 3, when the pipe D is cut off, the pipe D is connected to the support line C and the LCX cable A.
Therefore, the joint portions H and I on both the upper and lower sides of the pipe D must be cut, and the workability is not good. Moreover, when the pipe D is cut off, the LCX cable A is also cut off. Therefore, 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 the LCX cable A is cut off, since the LCX cable A is located between the support line C and the pipe D, the joint portions H and I on the upper and lower sides of the LCX cable A must be cut. The workability is not good. Moreover, when the LCX cable A is disconnected, the pipe D is also disconnected. Therefore, it is also 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. Therefore, it is inconvenient to disconnect only one of them. This is also the case for the cable bundled with the lashing wires described above. An object of the present invention is to provide an optical unit transmission pipe which makes it easy to newly install or add an optical fiber, to easily disconnect a pipe for transmitting an optical fiber or a cable for simultaneous leakage, and to prevent vibration due to wind pressure. It is to provide a leaky coaxial cable. As shown in FIG. 1, a leaky coaxial cable with a pipe for transmitting an optical unit according to the present invention comprises a support line 1, a leaky coaxial cable 2, and a pipe 3 for transmitting an optical unit. In a leaky coaxial cable with an optical unit transmission pipe covered in common, a leaky coaxial cable 2, a support line 1, and an optical unit transmission pipe 3 are sequentially arranged from the bottom upward to be covered in common, and the support line 1 is provided. And light unit sent
Both the common pipe 3 and the hanging pipe 20 are supported by
Place the pipe 3 for unit transmission on the support wire 1
The Buru 2 suspended by the lower support wire 1 is also of the a. [0013] [act] In the optical unit feed-class piped leaky coaxial cable of the present invention, the upper part of the pipe 3 is support wire 1, leakage coaxial cable 2 are respectively disposed below the support wire 1, supporting lifting line 1
And the pipe 3 are both supported by the suspending fittings 20, and the light
Place the pipe 3 for unit transmission on the support wire 1
Since the Buru 2 suspended in the lower support line 1, not being supported lifting the Ru leakage coaxial cable 2 Dakedea. For this reason, even if the cable is laid near the track of a train subjected to a strong wind pressure, the cable is less likely to sway and the fatigue damage due to vibration is less likely to occur as compared with the conventional one. Further, the leaky coaxial cable 2 can be easily separated simply by disconnecting the joint 15 between the leaky coaxial cable 2 and the support wire 1, and the joint 1 between the pipe 3 and the support wire 1 can be easily separated.
The pipe 3 can be easily separated simply by separating the pipe 6. An embodiment of a leaky coaxial cable with a pipe for transmitting an optical unit according to the present invention will be described in detail with reference to FIGS. 2 is a leaky coaxial cable (LCX cable), 1 is a support wire, 3 is a pipe for transmitting an optical unit, these are sequentially arranged from the bottom to the top, and are commonly covered with a plastic sheath 5. ing. At this time, the support wire 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 example, a stranded wire of galvanized steel wire is used. The LCX cable 2 includes a center conductor 10, an inner insulator 11 formed of a rectangular polyethylene string in a spiral shape, an outer insulator 12 such as a polyethylene pipe, a metal, and the like. Made of an external conductor 13 made of aluminum. [0017] As the peripheral wall of the outer conductor 13 is shown in broken lines in FIG. 2, are large number formed slits shaped slot (groove) 14 with and uniformly spaced on the swash Me in the circumferential direction, the slot The signal transmitted from 14 to the central conductor 10 is leaked to the outside. The pipe 3 for transmitting the optical unit is disposed directly above the LCX cable 2 (directly above the support line 1), and the pipe 3 is formed so that the optical fiber is fed later with compressed air or the like. It is hollow, and a plastic pipe such as a polyethylene pipe is used for it. Example of use of the present invention A leaky coaxial cable with a pipe for transmitting an optical unit according to the present invention is laid along a longitudinal direction in an underground cave or a tunnel similarly to the conventional one. At this time, as shown in FIG. 2, an arbitrary position in the longitudinal direction of the support line 1 and the pipe 3 above the LCX cable 2 is supported and suspended by the suspension fitting 20. According to the leaky coaxial cable with the pipe for transmitting the optical unit of the present invention, the following effects can be obtained. . The support line 1 and the pipe 3, the leaky coaxial cable 2 in this order upward near is, the support wire 1 and the pipe 3 is supported by the hanging bracket 20 as shown in FIG. 2, the optical unit sending the generic
Pipe 3 on support wire 1 and leaky coaxial cable 2 on support wire
Since suspended in the first lower is the vibration leakage coaxial cable 2 by wind pressure suppression leads to prevention of fatigue failure of the leaky coaxial cable. . Since the leaky coaxial cable 2 is arranged at the lowermost stage, the connecting portion 15 between the support wire 1 and the leaky coaxial cable 2 can be separated to easily separate 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 separating the connecting portion 16 of the pipe 3.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a leaky coaxial cable with a pipe for transmitting an optical unit according to the present invention. FIG. 2 is a perspective view showing an embodiment of a leaky coaxial cable with an optical unit transmission pipe 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 diagram showing an example of use of a leaky coaxial cable with an optical unit transmission pipe. [Description of Signs] 1 support wire 2 leaky coaxial cable 3 pipe for transmitting optical unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yubara 2-4-2, Shibata, Kita-ku, Osaka-shi, Osaka Inside West Japan Railway Company (72) Inventor Yosuke Ikeda 2--4, Shibata, Kita-ku, Osaka, Osaka No. 24 West Japan Railway Company (72) Inventor Kaku Hirano 2-4-2 Shibata Kita-ku Osaka-shi, Osaka West Japan Railway Company (56) References JP-A-7-106845 (JP, A (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 6/44 H01B 7/18 H01B 11/18 H01B 11/22

Claims (1)

(57) Claims 1. A leak with a pipe for transmitting an optical unit, wherein the supporting line (1), the leaky coaxial cable (2), and the pipe for transmitting the optical unit (3) are commonly coated. In a coaxial cable, a leaky coaxial cable (2), a support line (1), and a pipe (3) for transmitting an optical unit are sequentially arranged from the bottom upward.
And a common covering, and the support wire (1) and the optical unit
Supporting both the Ip (3) and the hanging bracket (20),
Leak the pipe (3) for unit transmission over the support wire (1).
Hang the leaky coaxial cable (2) under the support wire (1)
A leaky coaxial cable with an optical unit transmission pipe.