KR100533219B1 - Optical fiber joint box for submarine telecommunication cable - Google Patents

Abstract

According to the present invention, since the optical cable connection portion and the junction are distributed in the cylindrical junction box in the longitudinal direction and the outer diameter of the junction box is made compact, the outer diameter of the junction box does not increase as a whole due to the outer diameter of the junction box. As it is not large, excessive external force due to tide flow rate and water pressure due to depth are not increased, and safety can be secured throughout the installation route of submarine cables.

Description

Submarine telecommunication cable {Optical fiber joint box for submarine telecommunication cable}

The present invention relates to a submarine communication optical cable connection box which attracts and arranges a connection gown in an optical cable junction box housed in a general optical hybrid power cable such as a submarine cable or a subsea optical composite cable and three joint sheath cables and a subsea optical fiber cable. Many islands are scattered, and as part of the power supply to these islands, namely, the Rural Electrification Project, since 1979, all the power and telecommunication complex cables laid between the land and the islands are laid out by foreign technology. It is operated by domestic technicians.

1 to 3 show a seabed power cable is laid, Figure 4 shows a submarine optical cable produced in Korea. As shown in the figure, the cable is laid in a narrow space between three or four power cables, and the cable is laid as a long length cable without a connection in the middle. If the manufacturing plant is located on the beach, it is possible to produce the optical cable up to 100 to 250 km long jangjang because it is produced and tested and shipped to the site after winding the coils to the barge in continuous operation without connection. In Korea, since all wire manufacturing plants are located on land, communication cables of more than 2 km long cannot be produced, and power cables have never been manufactured.

Therefore, domestic cable manufacturers also place submarine cable manufacturing facilities on the beach and replace existing cables with optical hybrid power cables with state-of-the-art optical communication cables. Since the cable construction is carried out at the same time, it can reduce the cost of construction, meet the explosive increase in communication demand between the land and the island, and meet the demand of the high-speed Internet, as well as provide high-quality electric power and save foreign currency. If construction length should be short during construction or sudden accident occurs, connection construction must be done. In particular, in the submarine cable, when the outer diameter of the connection point is locally increased, the installation work is difficult, and excessive problems are caused because excessive external force is applied by the flow rate of the algae and the water pressure is increased by the depth. The reason why the outer diameter of the connection point in the submarine cable is large is largely because the optical cable needs to be retained in the junction box after the optical cable is interconnected, so that the connection point becomes local because the outer diameter of the optical cable is larger than the cable outer diameter. In the past, as a method of attracting optical cable joints, the receiving member of the connecting cable was arranged on the outer periphery of the optical cable connecting portion. In this case, the size of the outer diameter of the optical cable connecting portion including the cable holder is inevitable.

An object of the present invention is to disperse the optical cable connecting portion and the connecting gown in the cylindrical junction box in the longitudinal direction and to compact the outer diameter of the connecting box so that the outer diameter of the connecting box does not become large due to the outer diameter of the connecting box, and thus the connecting box Since this is not locally large, it is to provide a subsea communication optical cable junction box that does not increase the excessive external force due to the tide flow rate and the water pressure due to the depth, and does not affect the entire installation route of the submarine cable.

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In the submarine communication optical cable junction box according to the present invention, an aluminum tube of two optical cables, each of which is inserted in the junction box corner cover and peeled off for interconnection, is fixed to the aluminum tube holder by an aluminum tube fixing saddle, and the optical cable The center line tension member from the interconnection is interconnected by the tension member connection sleeve inside the junction box, and the optical connection protection sleeve insertion slot having a plurality of optical connection protection sleeve insertion grooves formed in the longitudinal direction on the inner circumferential surface of the junction box The optical connection protection sleeve that is seated in the plug holder bracket is fixed by the plug holder bracket fixing bolts, and the optical fiber wires from the two different optical cables are fusion-spliced so that the thickness of the wiring connection is not increased, and the optical connector is placed thereon. With protective sleeve fitted Each optical fiber wire is inserted into the optical connection protection sleeve insertion groove and is fixed to the inner center of the junction box. Each of the optical fiber wires from the two different optical cables is bundled into a bundle of optical fibers in a state of being bundled by a PVC tube to form an interior of the junction box. It is fixed to the left and right by the optical fiber fixing hanger, it is characterized in that the waterproof compound is applied to the inside of the cover of the junction box. Hereinafter, the present invention will be described in detail.

The submarine communication optical cable junction box 12 according to the present invention has a long cylindrical shape and has a cover 12A that can be opened and closed at the top, and is formed to open and close the cover. As shown in Fig. 5, the cover 12A of the junction box is opened and the cables entered through both junction box edge covers 18 are connected. Insert the aluminum tube 1 of the cable into both sides of the junction box 12 and cut it in consideration of the length of the junction length. First, the aluminum tube 1 in the junction box 12 is cut into the aluminum tube holder 9. In order to fix it, the aluminum tube 1 covering the optical fiber 15 is cut out and the outer shell is left to the length of the connecting graft so that the aluminum tube 1 can be fixed with the aluminum tube anchors 8. At this time, it should be noted that care should be taken not to bend the aluminum tube 1 or to damage the optical fiber 15.

The nylon tape and swirling tape are cut from the cutout of the aluminum tube 1, leaving about 5 mm, and the scotch tape 19 is wound thereon. The aluminum tube 1 is fixed to the aluminum tube holder 9 in the junction box 12 so as not to move with the aluminum tube holders 8. In addition, the centerline tension members 3 from both cables are brought into contact with each other, and a metal tension member connection sleeve 5 is inserted thereon, and is pressed to connect each other.

Next, in order to process the optical fiber 15 in the junction box 12, the outer shell of the aluminum tube 1 coated on the optical fiber 15 is peeled off from the end. At this time, it is obvious that care must be taken not to damage the internal optical fiber 15.

Then, the optical fiber wire 17 of the optical fiber 15 is divided, and each of the divided optical fiber wires 17 is peeled off the silicone coating and lubricated, and then the optical connection protective sleeve 11, which is a wire protection silicone tube, is melted before welding. Insert it. The optical connection protection sleeve 11 is inserted in accordance with the color of the optical fiber element wire 17. In addition, since the optical connection protection sleeve 11 has a heat shrinkage action, the optical connection protection sleeve 11 is applied to the fusion splicing point and the optical fiber element wire 17 which has been peeled off by applying heat.

For fusion splicing, the optical fiber 15 to be fusion spliced is stripped by a length of 30 to 50 mm using a wire stripper or a material, and a length suitable for splicing by using an optical fiber cutter, that is, a cutter. In this case, the cutting surface should be cut at right angles to the longitudinal axis, and it should be noted that dirt should not be stained.

Subsequently, after aligning and confirming both optical fibers 15 to the optical fiber fusion splicer (not shown), if both optical fibers 15 are in a good state, the optical fiber fusion spliced connection will not become large. After that, the center of the optical connection protective sleeve 11, which is fitted in advance, is positioned at the optical fiber connection point 20 and heat shrinked.

In addition, the optical connection protective sleeve mounting bracket 4 is detached from the optical connection protection sleeve mounting bracket holder 6, and the optical connection protection sleeve 11, which has been fused, is inserted into the optical connection protection sleeve insertion groove 13. At this time, the optical connection protective sleeve 11 is inserted into both ends of the optical connection protection sleeve insertion groove 13 so as to come out about 5 mm to make it easier to pull out and insert.

After inserting the optical connection protective sleeves 11, in which the fusion of the optical fiber wires 17 is completed, into the optical connection protection sleeve insertion grooves, one by one, the optical connection protection sleeve insertion slots 4 and the optical connection protection sleeve insertion bracket holders 6 ) To the inner center of the junction box (12).

At this time, in order to prevent the breakage of the optical fiber element wires 17, the optical fiber fixing hangers of the left and right sides of the junction box 12 are formed by forming the optical fiber once in a bundle by the pre-inserted PVC tube 2. 7) Hang on and fix the dispersion.

When the operation is completed as described above, the waterproof compound is applied to the inside of the junction box cover 12A to prevent moisture penetration, and the junction box cover 12A is closed.

On the junction box 12, the adhesive aluminum tape is wound twice with a 1/2 ram, and on the outermost stainless steel case 21, the adhesive hydrothermal side tube 22 is heated and shrunk to be subjected to secondary waterproofing. After the internal waterproofing of the junction box 12 is completed, the junction box 12 is stored in an outer case not shown.

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Therefore, the present invention distributes the optical cable connection portion and the connecting gown in the cylindrical junction box in the longitudinal direction and makes the outer diameter of the junction box compact, so that the outer diameter of the junction box does not become large as a whole due to the connection length, Since it is not locally large, it is possible to ensure safety throughout the cable route laid on the seabed by receiving excessive external force due to the flow rate of the bird and the water pressure caused by the depth of the sea. It will be apparent to those skilled in the art that various modifications and variations are possible within the scope of the invention, and such modifications and variations belong to the appended claims.

1 is a view showing a general 22 KV CV subsea optical composite power cable (double wire sheath).

Figure 2 shows a typical 22 KV CV subsea optical composite power cable (single wire sheath).

Figure 3 shows a typical 600V CV optical composite power cable (three core cavity sheath).

4 is a view showing a general subsea (sea) fiber optic cable.

5 is a view showing the optical cable connection diagram of the present invention.

6 is a view showing the interior of the optical connection enclosure of the present invention.

-Explanation of symbols for the main parts of the drawings-

DESCRIPTION OF SYMBOLS 1 Aluminum tube 2 PVC tube 3 Tension member 4 Optical connection protective sleeve mounting bracket 5 Tension member connection sleeve 6 Optical connection protection sleeve mounting long cylinder holder 7 Optical fiber holder 8 Aluminum tube fixing saddle 9 Aluminum tube Fixing stand 10: Waterproof spacer 11: Optical connection protection sleeve 12: Junction box 12A: Cover 13: Optical connection protection sleeve insertion groove 14: Optical connection protection sleeve insertion Longitudinal support base bolt 15: Optical fiber 16: Optical fiber one-time turnover 17: Optical fiber Element wire 18: junction box edge cover 19: Scotch tape 20: optical fiber connection point 21: stainless outer case 22: adhesive heat shrink tube

Claims (1)

On both sides, the aluminum tube of the two fiber optic cables, which are fitted in the junction box corner cover and peeled off for interconnection, is secured to the aluminum tube holder by an aluminum tube fixing saddle, and the centerline tension member from the fiber cable is tension member inside the junction box. Optical connection protective sleeve interconnected by a connection sleeve, wherein the optical connection protective sleeve is provided with a plurality of optical connection protective sleeve insertion grooves in the longitudinal direction on the outer peripheral surface of the junction box, the optical connection protective sleeve with the optical connection protective sleeve mounted It is fixed by the plug holder fixing bolts, and each optical fiber wires from the two different optical cables are fusion-spliced, so that the thickness of the connection portion is not increased, and the optical connection protective sleeve insertion groove is inserted in the state where the optical connection protection sleeve is fitted thereon. Are inserted into each It is fixed to the inner center of the box, each of the optical fiber wires from the two different optical cables are formed as a single-fiber optical fiber in a bundle bundled by a PVC tube, and is fixed to the optical fiber hanger on the left and right inside the junction box, Submarine communication optical cable junction box characterized in that the waterproofing compound is applied to the inside of the cover of the junction box.