JP2777706B2 - Optical cable connection box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection box for an optical cable, and more particularly to a connection box for an optical cable housed together with a power cable connection in a repair box for an optical submarine power cable.

[0002]

2. Description of the Related Art When a submarine cable is damaged, a cable near the submarine cable is removed, a new cable is laid, and the cable is connected to an existing cable. The connection box used in this case is called a repair connection box.

[0003]

In the case of an optical composite submarine cable, since the power cable and the optical cable are housed in the same cable, when connecting the two, processing such as shifting the position of each cable connection box is performed. Required,
The work was extremely difficult. Therefore, it is conceivable to put the connection part between the power cable and the optical cable in one repair connection box.

At that time, the following is important. Make sure that the insulating compound filling the repair junction box does not enter the optical cable junction box. When a flood accident occurs in the cable section, water transmitted under the sheath of the optical cable should not reach the connection section of the optical fiber.

[0005]

Means for Solving the Problems As exemplified in FIG.
An end member 56 is attached to the end of the watertight container 54 in a watertight manner, and a connection portion 60 of an optical cable passing therethrough is connected to the container 54.
It is generally considered that the optical cable connection box is provided inside the optical cable connection box. It will be described later
As described above, the optical fiber 240 is
And the sheath 244
(See Fig. 3)
Use sex actively. A packing 66 between the end member 56 and the optical cable 24;
Is provided. Outside the end member 56, the sheath 244 of the optical cable is removed, and the heat-shrinkable tube 72 is put in a contracted state over the sheath removed portion and the sheath 244 on both sides thereof. A water-tight cover 74 is put over the optical cable 24 and the end of the container 54 where the heat shrink tube 72 is put. · The cover 74 over the optical cable 24 and the cover 74 which penetrates or <br/> while shrinking the heat shrinkable tube 76 Buseru. It also definitive inward from the end member 56, the end piece
56 and Oite between the optical fiber connecting unit 60, to remove the sheath 244 of the optical cable, toward the sheath removed portion and the sheath 244 adjacent thereto, put in a deflated state of heat shrinkable tube 78. Fill the cover 74 with the waterproof compound 82.

[0006]

[Operation] The heat-shrinkable tube 76 prevents the insulating compound 94 from entering the cover 74. Even if it does, it does not enter inside the end member 56 due to the waterproof compound 82 and the packing 66. Even if the cable portion is flooded into the optical cable 24 and enters the optical cable connection portion 50 along the inside of the sheath 244, the sheath 244 of the optical cable is removed outside the end member 56, and a heat-shrinkable tube is added thereto. 72
The water cannot go beyond this part because it is covered. Should even this portion there water can pass, definitive inward from end member 56, the light with the end piece 56
Fraud and mitigating risk sheath 244 of the optical cable is removed during the fiber connection portion 60, since the heat shrinkable tube 78 is pushed down, the water does not reach the connection portion 60. The stainless steel pipe 242 below the sheath 244 is removed.
Therefore, the heat-shrinkable tubes 72 and 78 are heat-shrinked.
Even when heated, there is no dominance of degradation (tight optical cable
If there is a plurality of resin under the sheath 244 as shown in FIG.
There is a high risk of thermal degradation of the coating.)

[0007]

FIG. 3A schematically shows an optical composite DC 500 kV submarine OF cable which is an example of a cable to which the present invention is applied. 10 is a cable conductor, 12 is an oil passage, 14 is a cable insulator, 16 is a lead sheath, and 18 is a reinforcing layer.

Reference numeral 20 denotes an anticorrosion layer, on which an intervening cord 22 and an optical cable 24 having the same thickness are provided. The optical cables 24 are arranged at equal intervals, for example, with a total of 16 optical cables 24 with the intervening string 22 interposed therebetween. The optical cable 24 is one in which, for example, one optical fiber 240 is loosely housed in a stainless steel pipe 242 and a polyethylene sheath 244 is applied, as shown in FIG. 26 is a seat bed layer, 28 is a galvanized iron wire, and these constitute an iron wire exterior. 3
Numeral 0 is a PP yarn sheath.

FIG. 2A shows an example of a connecting portion for repair between the above composite cable and the split cable. 11 is a cable conductor connection pipe, 15 is a reinforcement insulator. Reinforced insulator 1
5 with a spacer 32 (for heat dissipation) sandwiched between the inner protective tube 3
Put 4 on. The space between the end and the lead sheath 16 is treated by a leadwork 36, and the inside is filled with an insulating oil 38 to form a power cable connecting portion 40.

The end of the iron wire 28 is connected to a retaining ring 41.
And tied up with an iron wire 42 from above and fixed. On the folded part of the iron wire 28 of the left and right cables,
Two donut-shaped retaining plates 44 are applied to each. A long tension bolt 46 is passed through the retaining plate 44, and a nut 48 is tightened to fix the gap between the iron wire 28, the retaining plate 44 and the tension bolt 46.

On the reinforcing layer 18 on one side, for example, four optical cable connecting portions 50 are held by a holder 52 as shown in FIG. 2B. The optical cable connection unit 50 will be described later in detail.

An external protective tube 92 is placed over the optical cable connecting portion 50 and the power cable connecting portion 40 via a heat radiating spacer 90, and the end portion and each cable are water-tightly treated and the inside is insulated. The compound 94 is filled. The above is the description of the repair connection box.

FIG. 1 schematically shows only the optical cable connection portion 50. (A) is an overall explanatory view, (b) is a right side view thereof, (c) is a detailed explanatory view of the terminal, and (d) and (e) show reduced cross sections of D and E, respectively. If the total number of optical cables 24 is 16, for example, each optical cable connection unit 50 processes four cables. However, FIG. 1 shows a case where only one line is processed in order to avoid complication.

An end member 56 is attached to the end of the watertight container 54 of the optical cable connection portion 50 in a watertight manner, and the space between the end member 56 and the container 54 is sealed by an O-ring 57. One of the optical cables 24 is drawn into the container 54 through the end member 56. Within the optical cable connection 50 is a flat book-shaped tray 58. The optical fibers 240 are connected in the tray 58 so as to have an extra length. Numeral 60 denotes a connecting portion of the optical fiber 240, numeral 62 denotes a holder, and numeral 64 denotes a disk for making an extra length. Then, the other connected optical cable 24 is pulled out of the container 54 from the same side as the drawing side of the optical cable 24.

A packing 66 is provided where the optical cable 24 passes through the end member 56 (68 is a packing presser). Insert one end of a stainless steel pipe 70 into the surface of the packing presser 68 where the optical cable 24 passes,
Fix it. The optical cable 24 is a stainless steel pipe 7
Pass through 0. The optical cable 24 is protected by the stainless steel pipe 70, and the direction of the optical cable 24 on the outside from the end member 56 is determined.

Outside the end member 56, the sheath 244 of the optical cable 24 is removed, and the stainless steel pipe 24 is removed.
Expose 2 And the exposed stainless steel pipe 24
2 and sheath 244 on both sides thereof and stainless steel pipe 7
A heat-shrinkable tube 72 is placed over the end of the zero and shrunk.

Then, a watertight cover 74 (for example, made of PVC) is put over the optical cable 24 and the end of the container 54 where the heat shrink tube 72 is put. The base 740 of the cover 74 has a thick cylindrical shape and fits closely to the outside of the watertight container 54 and the end member 56. On the front surface (the right side in FIG. 1), thin protrusions 742 of the number of optical cables 24 (two in this example) are integrally formed. The tip 744 of the protruding portion 742 is further narrowed, and is in close contact with the optical cable 24 penetrating that portion. A heat-shrinkable tube 76 is put over the tip 744 of the cover 74 and the optical cable 24 penetrating the inside thereof to shrink.

Inside the end member 56, the sheath 244 of the optical cable 24 is removed to remove the stainless steel pipe 24.
Expose 2 And the exposed stainless steel pipe 24
The heat-shrinkable tube 78 is put over the sheath 2 and the sheath 244 adjacent to the tube 2 and contracted. The exposed stainless steel pipe 242 is pressed by the alignment member 80 (FIG. 1).
(E)). Then, from the alignment member 80 (left side in FIG. 1)
, The stainless steel pipe 242 is removed and the optical fiber
The bus 240 is exposed, and the optical fiber connection part 60 is formed. The cover 74 is filled with the waterproof compound 82. The above is the configuration of the optical cable connection unit 50.

[0019]

【The invention's effect】

(1) Even when housed together with the power cable connection section in one repair connection box, the insulating compound filled in the repair connection box does not enter the optical cable connection box. (2) Even if a water accident occurs in the cable portion and water flows under the sheath of the optical cable, the water does not reach the connection portion of the optical fiber.

[Brief description of the drawings]

1 (a) is a schematic explanatory view of an embodiment of the present invention, (b) is a right side view thereof, (c) is a detailed explanatory view of a terminal, and (d) and (e) are (c) FIG.

FIG. 2 is an explanatory view of a connection box for repairing an optical composite DC submarine OF cable using the optical cable connection section of the present invention.

FIG. 3 is an explanatory diagram of an optical composite DC submarine OF cable using the optical cable connection section of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable conductor 11 Cable conductor connection pipe 12 Oil passage 14 Cable insulator 15 Reinforcement insulator 16 Lead covering 18 Reinforcement layer 20 Corrosion prevention layer 22 Intermediate string 24 Optical cable 240 Optical fiber 242 Stainless steel pipe 244 Sheath 26 Seat floor layer 28 Iron wire 30 Exterior 32 Spacer 34 Protective tube 36 Lead work 38 Insulating oil 40 Power cable connection 41 Retaining ring 42 Iron wire 44 Retention plate 46 Tension bolt 48 Nut 50 Optical cable connection 54 Watertight container 56 End member 58 Book tray 60 Optical fiber connection 62 Holder 64 Disk 66 Packing 68 Packing presser 70 Stainless steel pipe 72 Heat shrink tube 74 Cover 740 Cover base 742 Projection 744 Tip 76 Heat shrink tube 78 Heat shrink tube 80 Alignment member 82 Waterproof Npaundo 90 spacer 92 outer protective tube 94 insulating compound

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoji Inohana 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Toshio Kobayashi 1-15-1, Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. (72) Inventor Yoshiaki Nakao 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Yoshiharu Nakamura 1-1-5-1 Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. (72) Invention Person Takashi Maruyama 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Toshiaki Hara 3-2-2 Nakanoshima, Kita-ku, Osaka-shi, Osaka Kansai Electric Power Company (72) Inventor Ryuji Miyafuji 3-2-2 Nakanoshima, Kita-ku, Osaka-shi, Osaka Kansai Electric Power Co., Inc. (72) Inventor Kazuki Terashima 6-15-1, Ginza, Chuo-ku, Tokyo Power supply Development Co., Ltd. (56) References Japanese Utility Model Showa 56-150910 (JP, U) Japanese Utility Model Showa 57-155514 (JP, U) Japanese Utility Model Showa 60-189007 (JP, U) (58) Fields surveyed (Int .Cl. ⁶ , DB name) G02B 6/24

Claims (1)

(57) [Claims] An end member (56) is attached to the end of the watertight container (54).
There is attached to the watertight, said end member 56, fiber-
Loosely store Iva 240 in stainless steel pipe 242
In the optical cable connection box in which the optical cable 24 provided with the sheath 244 penetrates and the connection portion 60 of the optical fiber 240 is provided in the container 54, the end member 56
A packing 66 is provided between the optical cable 24 and the optical cable 2 outside the end member 56.
4 is removed, the heat-shrinkable tube 72 is shrunk over the sheath-removed portion and the cable sheaths 244 on both sides thereof, and the optical cable 24 and the container are covered with the heat-shrinkable tube 72. Watertight cover 7 over the end of 54
4 is covered heat shrinkable tube 76 is covered in a state of being contracted toward the optical cable 24 and the cover 74 which penetrates the cover 74, definitive inwardly from said end member 56, the end member 56
The sheath 244 of the optical cable 24 is removed between the optical fiber connection portion 60 and the optical fiber connection portion 60, and the heat-shrinkable tube 78 is covered in a contracted state over the sheath-removed portion and the cable sheath 244 adjacent thereto. Optical cable connection box in which waterproof compound 82 is filled in 74