JPH05224029A - Suspension type connection box for optical cable wound with aerial power transmission line - Google Patents

Abstract

PURPOSE:To protect the connection part of an optical cable securely in safety by providing a fitting part for a suspension support on the upper part of an optical cable excessive-length housing part and suspending and supporting the optical cable on a support part for the aerial power transmission line. CONSTITUTION:A case main body 15 is provided integrally with the optical cable excessive length housing part 21 having an annular recessed groove 19 wherein the end part of the optical cable is looped and housed, an optical cable protection tube fixation part 23 which is positioned on both sides above the housing part 21, and the fitting part 25 for the suspension support positioned above the housing part 21. The excessive-length part of the optical cable 27 drawn in the main body 15 is looped and housed in the recessed groove 19 of the housing part 21. Then a connection part housing box 17 is fitted to the front surface of the housing part 21 with a bolt 37. The optical cable leading-in part 39 of the housing box 17 is positioned on the recessed groove 19 while the housing box 17 is fitted to the housing part 21. Consequently, the end part of the optical fiber 27 in the recessed groove 19 can be led in the housing box 17 reasonably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension type connection box for accommodating a connection portion of an optical cable wound around an overhead power transmission line.

[0002]

2. Description of the Related Art Conventionally, as a method of laying an optical cable for optical communication along an overhead power transmission line, a method of storing the optical cable inside the overhead ground wire and a method of winding the optical cable around the outer circumference of the overhead ground wire And are common. In both cases, the overhead ground wire at ground potential is used, so when connecting the optical cable on the way, fix the connection box directly to the tower and store the optical cable connection part in it. There is.

[0003]

On the other hand, recently, in a DC overhead power transmission line or the like, it has been considered to wind an optical cable around an overhead power transmission line instead of an overhead ground line. When laying an optical cable around an overhead power transmission line where a voltage is applied, fixing the connection box of the optical cable directly to the tower is
The transmission voltage is applied to the optical cable between the overhead power transmission line and the junction box, which is dangerous.

In order to prevent a voltage from being applied to the optical cable, it is conceivable to fix a rod-shaped insulator on a steel tower and install an optical cable connection box at the tip of the rod-shaped insulator.
This method has a drawback that the supporting structure of the optical cable connection box becomes large and the cost becomes high.

[0005]

In view of the above problems, the present invention provides a suspension type connection box suitable for accommodating a connection portion of an optical cable wound around an overhead power transmission line. The structure is such that the attachment part to the suspension support is integrated with the upper part of the optical cable extra length storage part that has an annular groove to store the end part of the optical cable wound around the overhead power transmission line in a loop shape. And a case main body provided on the front side of the extra cable length storage section of the case main body, and an optical cable connection section storage box detachably attached with the optical cable introduction section positioned on the annular groove. It is what

[0006]

This connection box can be easily suspended and supported by mounting the mounting portion provided on the upper portion of the optical cable extra length storage portion to the lower portion of the suspension clamp or the like (suspension support) of the overhead power transmission line. As a result, the junction box has the same potential as the overhead power transmission line, and no voltage is applied to the optical cable.

When connecting an optical cable wound around an overhead power transmission line, the end of the optical cable is pulled in with the storage box for the optical cable connection section removed from the case body, and the extra length is stored as the extra length storage section. Store in a loop. After that, the connection part storage box is attached to the case main body, the end part of the optical cable is pulled into the case main body, and the coating is stripped in the same manner as a normal optical cable to connect the optical fibers.

The connecting part storage box is detachable and is attached to the front of the extra length storage part of the case body.
This is to downsize the whole and to reduce the wind pressure load.
Further, the optical cable introduction part of the connection part storage box is positioned on the annular groove of the extra length storage part in order to allow the end part of the optical cable to be easily introduced into the removable connection part storage box. ..

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 6 show an embodiment of the suspension type connection box according to the present invention, and FIGS. 7 and 8 show the use state thereof. FIG. 1 is a suspension clamp for the connection box 11 of this embodiment.
FIG. 2 is a front view showing a state of being suspended and supported by 13, FIG. 2 is a partially cutaway front view showing an internal structure of the connection box 11, FIG. 3 is a side view of the connection box 11, and FIG. FIG. 5 is a front view of the case main body 15 of FIG. 5, FIG. 5 is a sectional view taken along the line AA of FIG. 4, and FIG.

The connection box 11 is composed of a case body 15 as shown in FIGS. 4 to 6, and an optical cable connection part storage box 17 mounted on the front surface thereof as shown in FIGS. 1 to 3.

The case body 15 has an optical cable extra length storage portion 21 having an annular groove 19 for storing the end portion of the optical cable in a loop shape, and an optical cable protection tube fixed on both upper sides of the optical cable extra length storage portion 21. The part (23) and the attachment part (25) to the suspension support located at the upper part of the optical cable extra length storage part (21) are integrally provided. The optical cable connection section storage box 17 is detachably attached to the front surface of the extra length storage section 21, and when the optical cable 27 is stored in the extra length storage section 21, it is removed from the connection section storage box 17.

The optical cable 27 has a protective tube 29 as shown in FIG.
Through the case body 15. The protective tube 29 has a gourd-shaped cross section, has a hole through which the optical cable 27 is inserted on one side, and a tensile strength member 31 is embedded on the other side. The end portion of the protection tube 29 is clamped and fixed to the protection tube fixing portion 23 of the case body 15 by the clamp piece 33, and the end portion of the strength member 31 is fixed to the case body 15 by the tightening piece 35.

The optical cable 27 drawn into the case body 15
The extra length of the is rolled into a loop and the annular groove of the extra length storage 21
Stored in 19. After that, the connection part storage box 17 is attached to the front surface of the extra length storage part 21 by the bolts 37. The optical cable introduction part 39 of the connection part storage box 17 is located on the annular groove 19 in a state where the connection part storage box 17 is attached to the extra length storage part 21. Therefore, the end portion of the optical cable 27 in the annular groove 19 can be pulled into the connection portion storage box 17 without difficulty. In FIG. 2, the optical cable introducing portion 39 is visible only in the lower left portion of the connection portion storage box 17, but the optical cable introducing portion is also provided in the lower right portion. The structure of the connection part storage box 17 is substantially symmetrical.

The optical cable 27 drawn into the connection part storage box 17 is stripped of its coating and separated into an optical fiber 41 and a tension member 43, the optical fiber 41 is connected, and the tension member 43 is fixed by a grip fitting 45. To do.

The connection part storage box 17 is the box body.
After the connection work of the optical cable 27 is completed inside, the lid 49 is covered, and the lid 49 is fixed to the box body 47 by the bolt nuts 51. As a result, the inside of the connection part storage box 17 is kept airtight and watertight.

Thereafter, in order to protect the extra length of the optical cable 27, the upper cover 53 is attached to the upper portion of the case body 15 with bolts 55.
And a semicircular lower cover 57 is fixed to the lower half portion of the extra length storage portion 21 with bolts 59.

The above is the structure and assembly method of the connection box 11.
As shown in FIG. 1, the connection box 11 is usually used by suspending and supporting the lower part of the suspension clamp 13 by a connecting fitting 61. 7 and 8 show the usage state. FIG. 7 shows the case where the junction box 11 is supported by the tension portion of the overhead power transmission line, and FIG. 8 shows the case where it is supported by the suspension portion.

In FIGS. 7 and 8, 63 is an overhead power transmission line, 65 is a tension clamp, 67 is a tension insulator line, 69 is a jumper line, 71 is a suspension insulator line, 13 is a suspension clamp, and 27 is an overhead power line. An optical cable wound around the 63 in a spiral shape,
29 is an optical cable protection tube, 73 is a fixture for the optical cable protection tube 29, and 11 is a connection box.

[0019]

Since the connection box according to the present invention has the above-mentioned structure, it can be easily suspended and supported by the tension portion or the suspension portion of the overhead power transmission line, and the connection portion of the optical cable can be safely and reliably provided. Can be protected. Further, since it is extremely compact, the wind pressure resistance is small, and since it is a suspension support system, it is not necessary to make the support structure so large, and the cost is low.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a junction box according to an embodiment of the present invention is attached to a suspension clamp.

FIG. 2 is a partially cutaway front view of the junction box of FIG.

FIG. 3 is a side view of the junction box shown in FIG.

FIG. 4 is a front view of a case body forming the connection box of FIG.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a side view taken along the line BB of FIG.

FIG. 7 is a front view showing a state in which the junction box of FIG. 1 is attached to a tension resistant portion of an overhead power transmission line.

FIG. 8 is a front view showing a state in which the connection box of FIG. 1 is attached to a suspended portion of an overhead power transmission line.

[Explanation of symbols]

11: Suspended connection box 13: Suspended clamp 15: Case main body 17: Optical cable connection section storage box 19: Annular groove 21: Optical cable extra length storage section 23: Protective tube fixing section 25: Suspended support mounting section 27: Optical cable 29: Optical cable protection tube 31: Tensile member 33: Clamp piece 35: Tightening piece 39: Optical cable introduction section 41: Optical fiber 43: Tension member 47: Box body 49: Lid body 53: Upper cover 57: Lower cover 63: Imaginary power line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadashi Ujino 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. An attachment portion to a suspension support is integrally provided on an upper portion of an optical cable extra length storage portion having an annular groove for storing an end portion of an optical cable wound around an overhead power transmission line in a loop shape. And an optical cable connection part storage box that is removably attached to the front of the extra cable length storage part of the case main body, with the optical cable introduction part positioned on the annular groove. Suspended type connection box for laying optical cables wound around overhead power lines.