KR20210000178A - Connection box for submarine communication cable - Google Patents

Abstract

Disclosed is a connection box which can stably impart mechanical stiffness. The connection box comprises: a connection unit having each of ends of cables connected thereto, and configured to connect the connected cables; and an external tensile unit disposed to be adjacent to the connection unit, and configured to fix at least a part of an exterior member formed to surround the cable in a bent state in a form which resists a tensile load acting in an axial direction of the cable.

Description

Connection box for submarine communication cable {CONNECTION BOX FOR SUBMARINE COMMUNICATION CABLE}

The present invention relates to a connection box for submarine communication cables for connection of cables installed underwater.

In general, the connection box is a device to physically connect the cable when it is required to extend the length or repair the cable, and functionally, it supplies power to various sensors buried in the water and transmits and receives the signals of each sensor. /Should be connected without compromising optical performance. In addition, although the junction box is assembled on land, it is often assembled on board (laying ship), and accordingly, high mechanical rigidity is required so that it can be safely installed without being damaged from various environments.

The junction box is a kind of connection point, and there is always a risk of moisture penetration into the junction box after installation underwater. If moisture penetrates into the junction box, the corrosion of the equipment is accelerated, and the electrical insulation performance is deteriorated by the moisture, causing failure and failure of the entire system. Since such an accident requires a disruption of the system operation and high maintenance costs, perfect watertight measures must be taken for the connecting components of the junction box to prevent this.

The junction box is an inner box that accommodates the connection point of the components to be connected (underwater cables, etc.), a protective molding part to protect the inner box from moisture penetration, and a tensile strength that can maintain the mechanical strength (tensile/breaking strength) of the components. It is composed of an external enclosure that can protect the assembly and its entirety from external environment and impact, and a bending limiting device to prevent excessive bending of components when handling the connection box.

Various cables and sensors installed underwater may not be able to install the desired points and points at once due to various technical problems or meteorological problems such as wind and waves during installation. Or, there is a situation where it is impossible to install at once due to the problem of the production length of the components to be installed. For this reason, the junction box becomes a core part that is absolutely necessary when installing underwater cables and sensors under the sea.

Also, military and civilian, in maritime defense and exploration/mining of marine resources, the burial of underwater cables tends to expand from a short distance to a long distance and from a small depth to a large depth. In this case, for components that are difficult to produce in long length due to the limitations of production facilities, the required length should be extended by using a junction box. In addition, in a movable (towing type) system other than a fixed installation type, the use environment is not stable, so the service life of cables and sensors is shortened, and the necessity of using a connection box continues to increase due to frequent accidents.

Basically, the junction box has a technical challenge of minimizing or having a diameter similar to that of its connection. If the volume or weight of the junction box increases, the handling property deteriorates, which can lead to unexpected accidents. In particular, if the weight or volume of the junction box increases, the probability of damage or accidents increases due to local concentration of the installation or operating drag. Therefore, it is required to develop a technology capable of maintaining mechanical stiffness even with a volume and length that is easy to handle and high tensile strength.

However, the connection box of the prior art uses a method of crimping the cable sheath steel wire in the longitudinal direction using a wedge-shaped part in order to secure mechanical rigidity against the tensile force. In this case, it has the disadvantage that it is not possible to reassemble the cable sheathed steel wire that has been fixed and released, and it is thicker than the cable diameter and the weight/volume to be connected to secure the required tensile force. Is being used.

In particular, when assembling the outer steel wire of the cable in a wedge type, a special crimping equipment is required, and even if pressure is applied evenly to the crimping plane with the crimping equipment, it is difficult to apply uniform pressure throughout the entire 360 degrees. Can be. Such a state is irregular and repeatedly or when subjected to high tension, the cable sheath steel wire portion in an incomplete crimp state is subjected to local stress, and breakage begins, and the system may be damaged.

The first object of the present invention is to provide a structure for assembling an armored steel wire for a cable capable of imparting mechanical stiffness to a connection box in a manner other than a method of assembling the external steel wire of a cable in a wedge-shaped manner to secure mechanical rigidity. Is in.

A second object of the present invention is to provide a structure of an inner casing sleeve capable of facilitating maintenance of an inner casing to which cables are connected.

A third object of the present invention is to provide a structure of a connection box capable of protecting an inner box from vibrations caused by a tensile load occurring in the axial direction of a cable.

In order to achieve the object of the present invention, a connection box for a submarine communication cable includes: a connection portion having ends of cables connected to each other, and configured to connect the connected cables; And an external tensioning part disposed adjacent to the connection part and configured to fix at least a part of an exterior member formed to surround the cable in a bent state in a form that resists tensile load acting in the axial direction of the cable. do.

The outer member includes a first arch portion bent in a form protruding toward the outside of the cable, and the outer tension portion has openings on both sides, and surrounds the cable and the outer member inserted through the opening. A housing formed so as to be; And an insert portion that is inserted into an empty space formed between the first arch portion and the cable, and is formed to fix the bent state of the first arch portion.

The external tension portion is inserted into a portion where the bending of the first arch portion begins among the empty space formed between the first arch portion and the inner surface of the housing, and fixes the bending state of the first arch portion together with the insert portion. It may further include a sheet portion formed so as to be.

The exterior member further includes a second arch portion extending from one end of the first arch portion and bent in a shape of a hook toward the inner surface of the housing, and the outer tension portion is between the second arch portion and the inner surface of the housing. An armoring portion may be further provided that is inserted into the formed empty space to fix the bent state of the second arch portion.

The second arch portion may be formed such that an end extending toward the inner surface of the housing is in contact with the inner surface of the housing.

The second arch portion may be formed such that an end extending toward the inner surface of the housing faces a direction opposite to a direction extending from one end of the first arch portion.

The external tensioning portion may further include a nut portion inserted through the opening and formed to pressurize the second arch portion toward the inside of the housing.

The external tension portion may further include a support portion disposed between the second arch portion and the nut portion and formed to support a load applied in the axial direction of the cable.

The connection unit may include an inner enclosure through which the cables are connected; And a first sleeve and a second sleeve formed to surround the inner casing and configured to be mutually coupled or separable, and configured to open and close the inner casing.

The first and second sleeves may be configured to be slidable along the axial direction of the cable on the outer surface of the inner case, respectively.

The connection part includes a molding part formed to seal the connection part of the inner case and the cable, and is formed on a space apart from the molding part and the external tension part, so that the slide movement of the first and second sleeves It may further include a hollow portion providing a space for.

The connection part further includes a watertight sleeve formed to surround an outer surface formed in the longitudinal direction of the first and second sleeves, and the molding part is coupled to an end of the watertight sleeve, and the first And it may be formed to seal the second sleeve.

The effects of the present invention obtained through the above-described solution are as follows.

First, the external tension part that imparts mechanical stiffness against the tensile load acting on the cable is formed so as to surround the cable so that at least a part of the outer member protecting the cable resists the tensile load acting in the axial direction of the cable connected to the connection part It is configured to be fixed in a bent state in the form of bending, and without the need for special crimping equipment to assemble the conventional cable's outer steel wire into a wedge shape, it has the mechanical stiffness that resists the tensile load acting on the cable on the junction box. It can be given stably.

Second, the first sleeve and the second sleeve formed to surround the inner case are configured to be mutually coupled or separated, so that the inside of the inner case can be easily checked by opening and closing the first and second sleeves in a situation where maintenance is required. I can.

Third, by the structure of the hollow part formed in the space between the molded part and the outer tension part that seals the connection part between the inner box and the cable, the cable is connected from vibration that may occur due to the tensile load occurring in the axial direction of the cable. The inner case can be stably protected, and a space in which the first and second sleeves can move when the first sleeve and the second sleeve are opened and closed is provided. In addition, the structure of the hollow portion may be used as a cooling space that suppresses the development of the high temperature of the molding mold in the horizontal direction in the forming process of the molding portion.

1 is a perspective view showing an example of a connection box according to the present invention.
Figure 2 is a cross-sectional view of the connection box shown in Figure 1;
3 is an enlarged view of the connection part shown in FIG. 1.
4A is a cross-sectional view showing a state in which the first sleeve and the second sleeve provided in the connection portion shown in FIG. 3 are separated and the inner case is opened.
4B is a cross-sectional view showing a state in which the inner case is closed by combining the first sleeve and the second sleeve provided in the connection portion shown in FIG. 3.
Figure 5 is a cross-sectional view showing an enlarged external tension portion shown in Figure 1;
6A and 6B are graphs showing CAE analysis modeling and results for the maximum tensile load analysis of a connection box in which a conventional exterior steel wire is compressed in a wedge shape, respectively.
7A and 7B are graphs showing CAE analysis modeling and results for the maximum tensile load analysis of the junction box of the present invention, respectively.
8 is a graph showing the results of a maximum tensile load test using an actual finished product of the junction box of the present invention.

Hereinafter, a connection box for a submarine communication cable according to the present invention will be described in more detail with reference to the drawings.

1 is a perspective view showing an example of a junction box 100 according to the present invention, and FIG. 2 is a cross-sectional view of the junction box 100 shown in FIG. For reference, FIG. 2 shows a state in which the cables 10 and 20 are not connected.

Referring to FIGS. 1 and 2, the junction box 100 may be structurally divided into two types: a type having a structure of “1 lead-in versus one withdrawal” and a shape having a structure of “1 lead-in vs. multiple withdrawal”. In addition, functionally, it can be classified into the form of "cable entry versus cable entry" and "cable entry versus non-cable exit such as sensors". In the present invention, structurally, "1 entry to 1 withdrawal" and functionally, "cable entry to cable withdrawal" type connection box 100 is targeted.

The connection box 100 includes a connection part 110 and an external tension part 120.

The connection part 110 is configured such that ends of cables 10 and 20 that are required to be connected are connected to each other, and connected cables 10 and 20 are connected. The cables 10 and 20 may be installed after line assembly on land for the purpose of extending the length of the cable or connecting the two cables 10 and 20 in the event of an accident, and generally during or after installation at sea. When a problem occurs between system operation, it is assembled and used on site as necessary. In addition, during underwater installation after assembly of the junction box 100, the product may receive a high tensile load due to the load of the installation equipment and an unexpected tidal environment. However, the junction box 100 of the present invention is capable of receiving a tensile load of at least 50 tons. It is configured to operate normally. Here, the tensile load is a load that tries to pull the member, and acts to stretch the member in the axial direction.

Here, the cables 10 and 20 may be formed of a power line for supplying power or an optical cable for transmission and reception of signals and data. In addition, the connection part 110 may include an inner case 111, a first sleeve 112 and a second sleeve 113.

The inner case 111 is formed so that the ends of the cables 10 and 20 are respectively connected to both sides, and the cables 10 and 20 are electrically or optically connected to each other as the cables 10 and 20 are connected. Made to be

The first sleeve 112 and the second sleeve 113 are formed to surround and protect the inner case 111, and are formed to selectively open and close the inner case 111. The opening and closing structure of the first and second sleeves 113 will be described later with reference to FIGS. 3 to 4B.

The external tension part 120 is disposed adjacent to the connection part 110 to which the ends of the cables 10 and 20 are connected, and is formed to surround the cables 10 and 20. At least part of the cables 10 and 20 are fixed in a bent state in a form that resists tensile load acting in the axial direction A of the cables 10 and 20. A more detailed description of the external tension unit 120 will be described later with reference to FIG. 5.

On the other hand, the junction box 100 is formed to surround the cables 10 and 20 at the front end of the cables 10 and 20 connected to the connection part 110, so that the cables 10 and 20 are bent. It may further include a bending limiting portion 140 to reduce the. Accordingly, when the cables 10 and 20 are installed, disconnection of the cables 10 and 20, which may occur due to excessive bending of the cables 10 and 20, can be prevented.

Hereinafter, the structure of the connection part 110 will be described in more detail with reference to FIGS. 3 to 4B together with FIGS. 1 and 2.

3 is an enlarged view of the connection part 110 shown in FIG. 1, and FIG. 4A is a first sleeve 112 and a second sleeve 113 provided in the connection part 110 shown in FIG. The inner case 111 is a cross-sectional view showing an open state, and FIG. 4B is a first sleeve 112 and a second sleeve 113 provided in the connection part 110 shown in FIG. 3 are combined to form the inner case 111 Is a cross-sectional view showing a closed state. For reference, FIGS. 4A and 4B show a state in which the cables 10 and 20 are not connected.

1 to 4B, the connection part 110 includes a first sleeve 112 and a second sleeve 113.

The first sleeve 112 and the second sleeve 113 are formed to surround the inner box 111 to which the cables 10 and 20 are connected, and are configured to be mutually coupled or separable, and the inner box 111 ) Is made to open and close. For example, the first and second sleeves 112 and 113 may be formed such that ends facing each other are engageable and fastened or separated to open or close the inner casing 111. In addition, although not shown in the drawing, the first and second sleeves 112 and 113 are composed of a magnetic unit formed such that an attractive force or a repulsive force that pushes the ends facing each other acts, so that the inner case 111 is required. It can be selectively opened and closed accordingly.

In addition, the first sleeve 112 and the second sleeve 113 may be configured to slide along the axial direction (A) of the cables 10 and 20 on the outer surface of the inner case 111, respectively. have. According to this configuration, as shown in FIG. 4A, the first sleeve 112 and the second sleeve 113 slide in a direction opposite to the direction in which the cables 10 and 20 are inserted into the inner case 111, respectively. Move to open the inner case 111 to the outside, and then again, as shown in Fig. 4b, slide in the direction in which the cables 10 and 20 are inserted into the inner case 111 to reopen the inner case 111 It can be wrapped and protected from the outside.

According to the structure in which the first and second sleeves 112 can be opened and closed, the first and second sleeves 112 and 113 are selectively opened and closed when maintenance of the cables 10 and 20 is required. ) Can be easily inspected.

Meanwhile, the connection box 100 may further include a hollow part 150, and the connection part 110 may include a molding part 115.

As shown in FIGS. 2 and 3, the molding part 115 may be formed to seal the connection part between the inner case 111 and the cables 10 and 20. For example, the molding part 115 may be made of a metal material, and may be formed through a molding process using a mold.

The hollow part 150 may be formed on a space spaced apart between the molding part 115 and the external tension part 120 to provide a space for the slide movement of the first and second sleeves 112 and 113. According to the structure of the hollow part 150, the cables 10 and 20 are electrically or optically connected from vibrations that may occur due to a tensile load occurring in the axial direction A of the cables 10 and 20. The inner enclosure 111 may be stably protected, and a space in which the first and second sleeves 112 and 113 can move when the first sleeve 112 and the second sleeve 113 are opened and closed may be provided. In addition, the hollow part 150 may be used as a cooling space for suppressing the development of the high temperature of the molding mold in the horizontal direction during the forming process of the molding part 115.

Meanwhile, the connection box 100 may further include an adjustment sleeve 130.

The adjustment sleeve 130 is disposed between the connection part 110 and the external tension part 120 and is formed to surround at least a part of the external tension part 120. For example, the adjustment sleeve 130 may be formed to surround at least a part of the external tension part 120 in an assembled state.

Here, the hollow part 150 may be formed inside the adjustment sleeve 130 as shown in FIG. 2.

In addition, as shown in FIG. 2, the connection box 100 protects the connection part 110 from external environment and shock, is assembled with the adjustment sleeve 130, and is physically connected to the external tension part 120. By further including the sleeve 160, it is possible to maintain rigidity without deformation or damage even under high mechanical tensile load. Here, the adjustment sleeve 130 may be connected and assembled with the outer sleeve 160 and the bending limiting portion 140 described with reference to FIGS. 1 and 2 to form the exterior of the connection box 100.

Meanwhile, the connection part 110 may further include a watertight sleeve 117.

The watertight sleeve 117 is formed to surround the outer surfaces formed in the longitudinal direction of the first and second sleeves 112 and 113. Here, the molding part 115 may be formed to be coupled to an end of the watertight sleeve 117 to seal the first and second sleeves 112 and 113 together with the watertight sleeve 117.

Hereinafter, the structure of the external tension unit 120 will be described in more detail with reference to FIG. 5 together with FIGS. 1 to 4B. Meanwhile, for convenience of explanation, the external tension unit 120 assembled to the cable 10 disposed on the left side of the connection box 100 will be described with reference to FIG. 1 as an example. The external tension part 120 described below may be equally applied to the external tension part 120 assembled to the cable 20 disposed on the right side of the connection box 100 with reference to FIG. 1.

5 is an enlarged cross-sectional view of the external tension unit 120 shown in FIG. 1.

Referring to FIG. 5, the external tension part 120 may include a housing 121 and an insert part 122.

The exterior member 11 may be formed of a metal material for mechanical rigidity, and may include a first arch portion 110a bent in a form protruding toward the outside of the cable 10. In addition, the maximum protruding point among the protruding portions of the first arch portion 110a may be formed to contact the inner surface of the housing 121.

The housing 121 has openings 121a on both sides, and is formed to surround the cable 10 and the exterior member 11 inserted through the openings 121a.

The insert portion 122 is inserted into an empty space formed between the first arch portion 110a and the cable 10, and is formed to fix the bent state of the first arch portion 110a. According to the configuration of the insert portion 122 and the first arch portion 110a, when a tensile load acts in the axial direction (A) of the cable 10, the first arch portion surrounding the outer surface of the cable 10 ( 110a) is supported by the insert portion 122 to stably maintain mechanical rigidity that resists deformation due to a tensile load acting on the cable 10. In addition, as shown in FIG. 5, the insert part 122 may have a ring shape by being formed to completely surround the cable.

Meanwhile, the external tension part 120 may further include a seat part 123.

The seat portion 123 is inserted into a portion of the empty space formed between the first arch portion 11a of the exterior member 11 and the inner surface of the housing 121 where bending of the first arch portion 11a starts. Thus, it is formed to fix the bent state of the first arch portion 11a together with the insert portion 122. For example, the seat portion 123 is disposed adjacent to the opening 121a of the housing 121 formed on the side into which the cable 10 is inserted into the external tension portion 120, and the insert portion 122 and the exterior member It is possible to fix the bent state of the first arch portion 11a with (11) therebetween. As shown, when a tensile load acts on the cable 10 in the axial direction (A), one side is supported by a stepped step formed in the opening 121a of the housing 121, and the other side It may be formed to be supported by the first arch portion 11a. In addition, the seat portion 123 may have a ring shape surrounding the outer member 11 similarly to the insert portion 122. In addition, the external tension unit 120 The shape of the housing 121 without the seat part 123 may be implemented in the shape of the seat part 123 to support the shape of the first arch part 11a.

In addition, the external tension part 120 may further include an armoring part 124.

First, the exterior member 11, together with the first arch portion 11a, extends from one end of the first arch portion 11a and is bent in a hook shape toward the inner surface of the housing 121 of the outer tension portion 120. A second arch portion 11b may be further provided.

In addition, the second arch portion 11b may be formed such that an end extending toward the inner surface of the housing 121 is in contact with the inner surface of the housing 121. Accordingly, when a tensile load is applied to the cable 10, the inner surface of the housing 121 in contact with the end of the second arch portion 11b can stably support the bent state of the second arch portion 11b. have. In addition, the second arch portion 11b may be formed such that an end extending toward the inner surface of the housing 121 faces in a direction opposite to a direction extending from one end of the first arch portion 11a. Accordingly, when a tensile load that acts in a direction opposite to the direction in which the cable 10 is connected to the connection part 110 occurs, it is possible to effectively resist deformation by the tensile load together with the armoring part 124 to be described later. .

The armoring portion 124 is inserted into an empty space formed between the second arch portion 11b and the inner surface of the housing 121 and is formed to fix the bent state of the second arch portion 11b. In addition, the armoring portion 124 may be formed to surround the outer member 11 similarly to the instrument portion 122 and the seat portion 123 to have a ring shape.

Meanwhile, the external tension part 120 may further include a nut part 125.

The nut part 125 is inserted through the opening 121a of the housing 121 formed on the side from which the cable 10 inserted into the external tension part 120 is drawn out, and is positioned adjacent to the inside of the housing 121 It is formed to pressurize the second arch portion (11b) of the exterior member (11). Accordingly, when a tensile load is applied to the cable 10, the bent state of the outer member 11 together with the second arch portion 11b can be maintained in a stable state inside the outer tensile portion 120. .

In addition, the external tension part 120 may further include a support part 126.

The support portion 126 is disposed between the second arch portion 11b and the nut portion 125, and may be formed to support a load applied in the axial direction A of the cable 10. For example, the support part 126 may form a thrust bearing and may be inserted between the nut part 125 and the second arch part 11b. Accordingly, even when a strong tensile load is generated in the cable 10, the bending shape of the second arch portion 11b and the first arch portion 11a can be stably maintained.

According to the configuration of the external tension part 120, the use of special crimping equipment required to assemble the external member 11 of the cable 10 in a wedge shape in the manufacturing process of the conventional connection box 100 is eliminated. It can be, and it is possible to stably impart mechanical stiffness to the connection box 100 to resist tensile loads acting on the cables 10 and 20.

On the other hand, the connection box 100 of the present invention may set the following basic requirements to expand the technology and limitations of the conventional connection box.

1. Maximum allowable power at the input terminal of the junction box (100): 750VDC, 10A

2. Outer diameter of junction box (100) (Outer diameter of cable (10, 20): 48mm or less): 130mm or less

3. Length of junction box (100) (outer sleeve (160) + bending limit (140) [left/right]): 1,500mm or less

4. Breaking tensile force (normal operation possible without disconnection of optical cables and power lines): 50 tons or more

5. Withstand voltage characteristic: No abnormality when 3.5kVAC is applied for 5 minutes

6. Enhancement of convenience and connection efficiency of the molding part 115 when connecting the junction box 100 and cables 10 and 20

7. Apply the test method and procedure of UJ QTS 200 (Universal Joint Qualification Test Specification 200) in the UK Cable & Wireless Marine (1998) when evaluating the performance of the cable assembly (cable (10, 20) + junction box (100))

In addition, the connection box 100 of the present invention may consider the following design points in order to satisfy the basic requirements.

1. The junction box 100 should be able to connect the number of cores of 16 optical fibers and 6 AWG concentric wires.

2. The change in optical loss of the junction box 100 should be 0.05dB per fusion point and 0.5dB or less per connecting point.

3. The junction box 100 applies the SZ method double steel wire fixing ring (part heat treatment) method for high tensile connection design.

4. The outer diameter of the junction box 100 should be about 130mm or less, the total length should be 1,500mm or less, and the breaking tensile force should be 50 tons or more.

On the other hand, the connection box 100 of the present invention secures high tensile strength performance, has a minimized outer diameter that is easy to handle, and is easy to assemble and maintain. The enclosure 100 is a female body structure, a watertight protective layer that is not destroyed even under water pressure of 1,000m, and seawater including salt so that it can accommodate up to 16 lines of 1KV-class power lines and optical cables for signal and data transmission. It is an alloy steel structure for mechanical structures that contains a certain amount of carbon in order to secure the overall mechanical rigidity of the device and the junction box 100, which are exposed to moisture that can inhibit or delay corrosion to ensure a long service life through appropriate post-treatment and painting. Can be configured.

In addition, the junction box 100 may be installed after pre-assembly on land for the purpose of extending the length of the cables 10 and 20 installed underwater or connecting the two cables 10 and 20 in case of an accident. As a result, it is assembled and used in the field as necessary when installing at sea or when a problem occurs between system operation after installation. During underwater installation after assembly of the junction box 100, the product may receive a high tensile load due to the load of the installation equipment and an unexpected tidal environment, but the junction box 100 of the present invention operates normally even under a tensile load of at least 50 tons. It is designed to do.

In addition, the junction box 100 of the present invention includes a connection of a power line for power supply and an optical cable connection for transmission and reception of signals and data, and has a complex structure that must maintain mechanical rigidity even at high tensile strength. In order to obtain high mechanical tensile strength, the external tension part 120 is designed so that the exterior members 11 of the cables 10 and 20 can be assembled in an arcuate structure. After the assembly work of the exterior member 11, a process design for connecting the inner enclosure 111 and arranging the molding process is performed. This is a watertight molding layer due to errors or impacts between operations when assembling the exterior member 11 after the molding process. This is because it can be damaged, and if it is installed underwater, it may cause an accident because it is difficult to find the damaged part in the process.

In addition, when the cables 10 and 20 are power lines, a sleeve-type joint is crimped to the power line conductor to obtain low connection resistance, and is protected with an insulating tube over the joint for line-to-line insulation. When the cables 10 and 20 are optical cables, the optical fiber is directly fused to maintain a low loss value so that there is no problem in the operation of the system, and the fusion point of the optical fiber is vulnerable to bending, so use a splint to protect it. The optical cable accommodates up to 16 lines so as to have a spare line in system operation, and an internal female body can be designed.

In addition, the connection space between the power line and the optical cable may be filled with appropriate jelly or oil in order to suppress moisture generation and prevent damage due to external impact. The connection between the power line and the optical cable and the enclosure filled with jelly or oil thereof is thoroughly protected from moisture. The straight section of the inner case 111 uses a pipe-shaped sleeve, and the sleeves at both ends and the bedding layers of the cables 10 and 20 connected to the inner case 111 form a watertight protective layer through molding. At this time, the pipe-shaped sleeve, the bedding layer of the cables 10 and 20, and the molding resin are made of the same series of materials. Through the design and manufacture of these components, the breaking strength of the junction box is 50 tons or more, the maximum operating depth is 1,000 m, and the outer diameter is 130 mm or less and the total length is 1,500 mm or less.

According to the configuration of the connection box 100 of the present invention, a total of 51 test items are satisfied according to the UJ QTS 200 (access box) evaluation standard internationally standardized as a performance evaluation method, thus significantly superior to the conventional technology level. The technical effects that were extended to the performance and effectively appeared are as follows.

First, compared to the prior art, the outer diameter of the junction box is 130mm or less, and the overall length is less than 1,500mm, and the minimization design is satisfied. In addition, the breaking tensile force satisfies the design confirmation of 50 tons or more without disconnection of both the optical and power lines. In addition, the withstand voltage characteristics are satisfied when 3.5kVAC is applied for 5 minutes. Next, the convenience of molding work and connection efficiency are enhanced when the connection box 100 and the cables 10 and 20 are connected compared to the prior art. In addition, if necessary for self-disassembly and internal inspection of the connection box 100, it is possible to check the connection state in the inner box 111 without disassembling the tensile assembly, and the connection box 100 can be reused.

For reference, a total of 51 test items according to the UJ QTS 200 (access box) evaluation standard standardized as an international performance evaluation method are as follows.

1. Length, 2. Outer Diameter, 3. Weight, 4. Breaking Strength, 5. Compressive Strength, 6, Repetitive Reverse Bending, 7. Water Pressure, 8. Seawater Inflow, 9. Torsion, 10. Filling Jelly Drop Characteristics, 11. Ultrasonic Inspection of Moldings, 12. Tensile Repeated Fatigue, 13. Cable Engine, 14. Sheave Laying and Lifting, 15. Operating Load, 16. Instant Load, 17. Salt Spray, 18. Temperature Environment, 19. Flower Passing, 20. Winding, 21. Impact strength, 22. Protective sleeve, buffer, steel wire assembly disassembly, 23. Junction box disassembly, 24. External steel wire fixing test, 25. Conductor resistance, 26. Insulation resistance, 27. Electrostatic capacity, 28. Withstand voltage characteristics , 29. Kingwire electrical continuity, 30. Kingwire electrical insulation, 31. Conductor continuity, 32. Tensile properties, 33. Heat resistance, 34. Outer sheath cold resistance, 35. Fiber optics, 36. Loss factor, 37. Bending factor , 38. Loss uniformity, 39. Loss difference by wavelength, 40. Color dispersion coefficient, 41. Zero dispersion wavelength, 42. Color dispersion slope, 43. Cut-off wavelength, 44. Mode field diameter, 45. Mode field concentric error, 46. Cladding diameter, 47. Cladding specific ratio, 48. Polarization mode dispersion, 49. Coating outer diameter, 50. Proof Test, 51. Temperature loss change.

Hereinafter, a manufacturing process of the connection box 100 of the present invention will be described with reference to FIGS. 1 to 5.

The manufacturing process of the connection box 100 is, first, the cables 10 and 20 constituting the connection box 100, the connection part 110, the external tension part 120, the adjustment sleeve 130, the bending limiting part 140 ), the outer sleeve 160 is prepared.

Next, the cables 10 and 20 and the exterior member 11 surrounding the cables 10 and 20 are fixedly connected to the external tension unit 120.

Thereafter, the ends of the cables 10 and 20 are connected to both sides of the connection part 110, respectively, to electrically or optically connect the cables 10 and 20.

Next, the molding part 115 is formed through a molding process using a mold to seal the connection part between the inner case 111 and the cables 10 and 20.

Finally, the adjusting sleeve 130, the bending limiting portion 140, and the outer sleeve 160 are assembled to complete the connection box 100.

In the connection box 100 completed through the manufacturing process, the first and second arch portions 11a and 11b form an exterior member 11 integrally, thereby providing rigidity that resists deformation against high tensile loads. In addition, watertightness can be achieved through the molding process of the molding unit 115, and the connection box 100 can be miniaturized.

Hereinafter, the maximum tensile load value of the present invention will be described with reference to FIGS. 6A to 7B.

6A and 6B are graphs showing CAE analysis modeling and the results for the maximum tensile load analysis of a connection box in which a conventional exterior steel wire is crimped in a wedge shape, respectively, and FIGS. 7A and 7B are respectively, the connection of the present invention. This is a graph showing CAE analysis modeling and the results for the maximum tensile load analysis of the housing 100.

6A and 6B, in the case of a connection box in which a conventional external steel wire is crimped in a wedge shape, when the tensile force change according to the displacement is analyzed as CAE (CAE-FE [1/4 model]), the maximum tensile load While this represents a value of 56.85 tons and does not exceed 60 tons, the junction box 100 of the present invention represents a value of 63.58 tons, as shown in Figs. 7A and 7B.

Hereinafter, the results of the maximum tensile load test using the actually manufactured finished product of the junction box of the present invention will be described with reference to FIG. 8.

8 is a graph showing the results of a maximum tensile load test using an actual finished product of the junction box of the present invention.

Referring to FIG. 8, the maximum tensile load test result for the actual finished product of the junction box 100 of the present invention was 65.2 tons, which was similar to the CAE analysis result, and the power line and optical cable were simultaneously at 65.2 tons without disconnection during the test. The fracture was confirmed through a test on the actual finished product.

10,20: cable 11: exterior member
11a: first arch portion 11b: second arch portion
100: connection box 110: connection part
111: inner case 112: first sleeve
113: second sleeve 115: molding part
117: watertight sleeve 120: external tension
121: housing 122: insert portion
123: seat portion 124: armoring portion
125: nut portion 126: support portion
130: adjustment sleeve 140: bending limiting portion
150: hollow 160: outer sleeve

Claims (12)

A connection portion having ends of the cables connected to each other and configured to connect the connected cables; And
An external tensioning portion disposed adjacent to the connection portion and configured to fix at least a portion of an exterior member formed to surround the cable in a bent state in a form that resists tensile load acting in the axial direction of the cable Connection box, characterized in that. The method of claim 1,
The exterior member includes a first arch portion bent in a shape protruding toward the outside of the cable,
The external tension part,
A housing having openings on both sides and formed to surround the cable and the exterior member inserted through the opening; And
And an insert portion that is inserted into an empty space formed between the first arch portion and the cable and is formed to fix the bent state of the first arch portion. The method of claim 2,
The external tension part,
A sheet that is inserted into a portion of the empty space formed between the first arch portion and the inner surface of the housing where the first arch portion begins to be bent, and is formed to fix the bending state of the first arch portion together with the insert portion Connection box, characterized in that it further comprises a portion. The method of claim 2,
The exterior member further includes a second arch portion extending from one end of the first arch portion and bent in a hook shape toward the inner surface of the housing,
The external tension part,
And an armoring unit that is inserted into an empty space formed between the second arch portion and the inner surface of the housing and is formed to fix the bent state of the second arch portion. The method of claim 4,
The second arch portion is a connection box, characterized in that formed so that the end extending toward the inner surface of the housing in contact with the inner surface of the housing. The method of claim 4,
The second arch portion, characterized in that the end portion extending toward the inner surface of the housing is formed to face in a direction opposite to a direction extending from one end of the first arch portion. The method of claim 4,
The external tension part,
And a nut portion inserted through the opening and formed to pressurize the second arch portion toward the inside of the housing. The method of claim 7,
The external tension part,
And a support portion disposed between the second arch portion and the nut portion and formed to support a load applied in the axial direction of the cable. The method of claim 1,
The connection part,
An inner enclosure through which the cables are connected; And
A connection box comprising a first sleeve and a second sleeve formed to surround the inner case, configured to be mutually coupled or detachable, and configured to open and close the inner case. The method of claim 9,
Wherein the first and second sleeves are configured to be slidable along an axial direction of the cable on an outer surface of the inner box, respectively. The method of claim 10,
The connection part includes a molding part formed to seal a connection part between the inner case and the cable,
And a hollow portion formed on a space spaced apart from the molding portion and the external tension portion to provide a space for the slide movement of the first and second sleeves. The method of claim 11,
The connection portion further includes a watertight sleeve formed to surround an outer surface formed in the longitudinal direction of the first and second sleeves,
The molded part is coupled to an end of the watertight sleeve, and is formed to seal the first and second sleeves together with the watertight sleeve.

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