JP3349497B2 - Wound optical cable line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound optical cable line in which an optical cable is wound and laid on an overhead ground wire or a transmission line, and more particularly, to a structure of a connection portion of an optical cable and its vicinity. is there.

[0002]

2. Description of the Related Art Conventionally, in order to construct a wrapped optical cable line, an optical cable is wound around an overhead ground wire for several spans, and a surplus optical cable is circulated by a steel tower for connecting the optical cable to a suitable length. Then, the optical fiber is fusion-spliced, the connection portion is stored in a connection box, and the connection box is fixed to a steel tower.
The looped optical cable is stored as a spare length when the fusion splicing of the optical fiber fails.

[0003]

In the conventional wrapping type optical cable transmission line, since the optical cable is wrapped and stored in a steel tower to which the optical cable is connected, a troublesome work for wheel wrapping is required, and the wrapped optical cable is installed in the steel tower. Fixing brackets are required to fix the unit. Further, since the optical cable is fixed to an overhead ground wire causing vibration such as lateral vibration and a steel tower as a stationary body, bending vibration is repeatedly applied by the vibration of the overhead ground wire, and there is a possibility of being damaged. In particular, damage is likely to occur at the point where the optical cable branches from the overhead ground wire to the steel tower side.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a winding type optical cable line which does not require the optical cable to be looped at a connection point of the optical cable, and in which the optical cable is hardly damaged. It is in.

[0005]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a winding type optical cable line in which an optical cable is wound and laid on an overhead ground wire or a transmission line. Introducing the end into the closure, storing the connection portion and excess length of the optical fiber core wire in the closure, and attaching this closure to an overhead ground wire, an overhead ground wire tower bypass or a transmission line jumper wire, At the point where the optical cable branches off from the overhead ground wire or transmission line for connection, the overhead ground wire or transmission line and the optical cable are gripped by a cushioned clamp provided with a cushion layer inside the clamp body. Things.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIG. 1 shows an embodiment of the present invention. In the figure, 10 is a steel tower, 12 is an overhead ground wire, 14 is a retaining clamp for fastening the overhead ground wire 12 to the steel tower 10, and 16 is an optical cable wrapped around the overhead ground wire 12. Optical cable 16, steel tower
It is wrapped around an overhead ground wire 12 over several spans on both sides of 10 and laid, and connection is made at the position of the tower 10.

[0007] A steel tower bypass line 18 (wire) is attached to the overhead ground wire 12 by a fixing bracket 20 so as to pass below the arm of the steel tower 10. A closure 22 is attached to the middle of the steel tower bypass route 18 by a suspension fitting 24. The end of the optical cable 16 is branched off from the overhead ground wire 12 near the fixing bracket 20, wound around the steel tower bypass line 18, and introduced into the closure 22.

As shown in FIG. 2, the closure 22 includes a two-part cylindrical housing 26, a plurality of extra-length storage cases 28 stored in the housing 26, and two ends of the housing 26. It is composed of an installed seal member 30 and the like. The optical cable 16 passes through the seal member 30 and is introduced into the closure 22.
In the closure 22, an optical fiber 32 whose sheath is peeled off and exposed is connected, and an extra connection length between the connection portion and the optical fiber 32 is stored in an extra length storage case.
The closure 22 has a watertight structure by connecting the split housing 26 with a fastening member (not shown).

On the other hand, where the optical cable 16 wound around the overhead ground wire 12 branches from the overhead ground wire 12,
And the optical cable 16 are gripped by the clamp with cushion. As shown in FIG. 3, the cushioned clamp 34 is provided with a cushion layer 38 formed of an elastic material such as rubber or foamed plastic inside a clamp body 36.

In this embodiment, as described above, the closure 22 for storing the extra connection length of the optical fiber 32 of the optical cable 16 is used.
Since the optical cable 16 is used, it is not necessary to loop the optical cable 16, so that the workability is improved and the fixing bracket for the rounded optical cable can be omitted. In addition, the closure 22
Instead, since the optical cable 16 near the connection point vibrates with the overhead ground wire 12 as a whole, since the optical cable 16 is attached to the tower detour 18 that vibrates together with the overhead ground wire 12, the factor of the bending strain is reduced. Further, at the point where the optical cable 16 branches from the overhead ground wire 12, the overhead ground wire 12 and the optical cable 16
Is held by the cushioned clamp 34, so that the optical cable 16 is less likely to be damaged when the overhead ground wire 12 vibrates.

[Embodiment 2] FIG. 4 shows another embodiment of the present invention. In the figure, 10 is a steel tower, 40 is an insulator series fixed to the arm of the steel tower 10, 42 is a retaining clamp attached to the tip of the insulator series 40, 44 is a transmission line secured to the retaining clamp 42, and 46 is two A jumper wire 16 for electrically connecting the anchoring clamps 42, 42 is an optical cable wrapped around a transmission line 44 and laid. The optical cable 16 is wrapped around the transmission line 44 over several spans on both sides of the tower 10 and laid.
The connection is made at the position of.

The closure 22 is attached to the middle of the jumper wire 46 by the suspension fitting 24. The end of the optical cable 16 is branched off from the transmission line 44 near the anchoring clamp 42, wound around a jumper wire 46, and introduced into the closure 22. The closure 22 is the same as that used in the first embodiment. At the point where the optical cable 16 wound around the transmission line 44 branches off from the transmission line 44, the transmission line 44 and the optical cable
16 is gripped by a cushioned clamp. The structure of the cushioned clamp 34 is the same as that used in the first embodiment.

In this embodiment, an optical cable 16 is connected to a transmission line 44.
This is a case in which the wrapping is laid around. Since the overhead ground wire is thinner than the transmission line, the projected area increase rate when the optical cable is wound is large, and the wind pressure load increase rate is large.
Steel towers often need to be reinforced. On the other hand, when the optical cable 16 is wound around the transmission line 44 as in the present embodiment, since the outer diameter of the transmission line 44 is much larger than the outer diameter of the optical cable 16, the projected area increase rate due to the winding of the optical cable 16 is small. Since it is small, and thus the wind pressure load increase rate is small, there is an advantage that it is not necessary to reinforce the tower. conventionally,
It was necessary to fix the looped optical cable to the tower, and there was a risk of ground fault between the transmission line and the tower via the optical cable, and there was a risk that the sheath of the optical cable might be damaged by tracking. Has been considered undesirable, but as in this embodiment,
If the closure 22 is fixed to the jumper wire 46 having the same potential as the power transmission line 44, the above-mentioned problem can be solved. Further, similarly to the first embodiment, the factor of bending strain applied to the optical cable 16 is reduced. Further, the use of the cushioned clamp 34 makes it difficult for the optical cable 16 to be damaged as in the first embodiment.

[Embodiment 3] FIG. 5 shows still another embodiment of the present invention. In this embodiment, the optical cable 16 is wound around the overhead ground wire 12 and laid. However, the difference from the first embodiment is that the closure 22 is directly attached to the overhead ground wire 12, The extra length storage box 48 for storing the extra length of the optical cable 16 is attached. The other parts are the same as those of the first embodiment of FIG. 1, and the same parts are denoted by the same reference numerals.

To connect the closure 22 directly to the overhead ground wire 12 as shown in FIG. 5, the optical cable 16 is connected on the steel tower 10 using the closure 22 as shown in FIG. Attach one of 22 to overhead ground wire 12,
Further, the extra length storage box 48 may be attached to the overhead ground wire 12, and the extra length of one optical cable 16 may be stored therein. In this embodiment, the steel tower bypass 18 as used in FIG. 1 is not required, and the closure 22 is directly attached to the overhead ground wire 12, so that the bending strain applied to the optical cable 16 due to the vibration of the overhead ground wire 12 is further reduced. Can be reduced.

[0016]

As described above, according to the present invention, the connection portion and the extra length of the optical fiber core of the optical cable are housed in the closure, and the closure is connected to the overhead ground line, the bypass line of the overhead ground line or the transmission line. Since the optical cable is mounted on the jumper wire of the electric wire, it is not necessary to loop the optical cable, which is conventionally required. Also, since the closure moves together with the overhead ground wire, the overhead wire tower detour or the transmission line jumper wire, the bending distortion of the optical cable when the overhead ground wire, overhead wire tower detour or the transmission line jumper wire vibrates. Can be reduced. Furthermore, at the point where the optical cable diverges from the overhead ground wire or the transmission line, the overhead ground line or the transmission line and the optical cable are gripped with a cushioned clamp. Damage can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view of the closure used in FIG.

3 (a) is a side view, FIG. 3 (b) is a front view, and FIG. 3 (c) is a C of FIG. 1 (b) of the clamp with cushion used in FIG.
-C sectional drawing.

FIG. 4 is a side view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

FIG. 6 is a perspective view showing a process of configuring the embodiment of FIG. 5;

[Explanation of symbols]

 10: Steel tower 12: Overhead ground wire 16: Optical cable 18: Steel tower detour 20: Fixing bracket 22: Closure 34: Cushioned clamp 36: Clamp body 38: Cushion layer 42: Termination clamp 44: Transmission line 46: Jumper wire

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadashi Ujino 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Yoshiyuki Kamata 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa (56) References JP-A-61-93411 (JP, A) JP-A-2-156207 (JP, A) JP-A-3-192309 (JP, A) JP-A-9-127343 ( JP, A) JP-A-7-79512 (JP, A) JP-A-8-172716 (JP, A) JP-A-56-103921 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H02G 15/08 G02B 6/44 G02B 6/46 H02G 1/02

Claims (1)

(57) [Claims] In a wound optical cable line in which an optical cable is wound and laid around an overhead ground wire or a transmission line, an end of the optical cable is introduced into a closure at a connection point of the optical cable, and an optical fiber is inserted into the closure. While storing the connection part and extra length of the core wire, this closure is attached to the overhead ground wire, the tower bypass of the overhead ground wire or the jumper wire of the transmission line, and the optical cable is branched from the overhead ground line or the transmission line for connection. Wherein the overhead ground wire or the transmission line and the optical cable are gripped by a clamp with a cushion provided with a cushion layer inside the clamp body.