Underwater equipment shore-based distribution box sea cable splicing device and splicing method

Abstract

The application provides an underwater equipment shore-based distribution box submarine cable splicing device and a splicing method in the field of marine communication engineering, which comprises a submarine cable, a beach manhole, a shore-based distribution box, a jumper cable, a land optical cable and a land cable, the submarine cable extends to the shore-based distribution box through one end of the beach manhole, the jumper cable in the shore-based distribution box extends to the beach manhole, the jumper cable is connected with the land optical cable and the land cable respectively, and the land optical cable and the land cable extend out from the other end of the beach manhole. The application meets the requirements of single-point multi-root sea and land cable centralized access and reliable switching, reduces the requirements for construction operation space and land occupation, has strong adaptability to the construction site environment, conveniently maintains and overhauls the multiple cables, avoids using too much manpower and construction tools, provides good protection for the shore-based distribution box, prolongs the service life of the shore-based distribution box, and is more convenient to maintain and repair.

Description

Technical Field

[0001] This invention relates to the field of marine communication engineering, specifically to a device and method for splicing submarine cables to shore-based power distribution boxes for underwater equipment. Background Technology

[0002] Generally, submarine cables are switched with land cables after landing. At this time, a waterline well is usually set up near the landing point for the construction, maintenance and protection of the switching parts of the submarine and land cables. These waterline wells are usually built with brick and concrete materials, with a standard well opening at the top for construction workers to enter and exit. The well is normally covered with a cover, which can be removed when entry is needed. The cables are laid flat inside the well. Its structure is simple and widely used. However, for complex underwater equipment, the system contains a large number of submarine and land cable interchanges, and the interchange process has high requirements. In order to improve the reliability of the project, reduce the land requirements for submarine cable landing and interchange, and facilitate daily maintenance after equipment delivery, all the above interchange work must be completed in a specially designed shore-based distribution box. This results in many submarine cables needing to land at the same location and needing to be interchanged with land cables in a relatively narrow area. If the traditional waterline well method is still used, it will not only fail to meet the land area restriction requirements, but also significantly increase the construction area and raise the requirements for the working environment. It will also be detrimental to the subsequent maintenance and protection of the submarine and land cable interchange parts.

[0003] Furthermore, a keyword search of existing patents and literature revealed no information related to the main content of this invention, indicating that further development and research are needed in this technical field in China, and there is currently no content available for comparative analysis. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a submarine cable splicing device and method for a shore-based power distribution box for underwater equipment.

[0005] According to the present invention, a submarine cable splicing device for a shore-based power distribution box for underwater equipment includes a submarine cable, a shore manhole, a shore-based power distribution box, a jumper cable, a land optical cable, and a land cable. The submarine cable extends through one end of the shore manhole into the shore-based power distribution box, and the jumper cable in the shore-based power distribution box extends into the shore manhole. The jumper cable connects the land optical cable and the land cable respectively, and the land optical cable and the land cable extend from the other end of the shore manhole.

[0006] In some embodiments, the bottom of the shore-based distribution box is provided with a cable-passing cover plate, and a watertight sealing installation joint is provided between the submarine cable and the cable-passing cover plate. The terrestrial optical cable and the terrestrial cable are respectively provided with watertight joints between them and the cable-passing cover plate.

[0007] In some embodiments, a watertight encapsulation installation joint is connected to the submarine cable. A tapered rubber is provided on the submarine cable located on one side of the watertight encapsulation installation joint. The internal optical fibers of the submarine cable located on the other side of the watertight encapsulation installation joint are respectively connected to a rigid sealant and a nylon braided sleeve. A soft sealant is connected to the outside of the rigid sealant and the nylon braided sleeve.

[0008] In some embodiments, the shore-based power distribution box is equipped with data processing equipment and fiber optic adapters. The submarine cable uses a single-core fiber optic cable for data processing, and after being integrated by the data processing equipment, the submarine cable outputs a two-core fiber optic cable to the fiber optic adapter.

[0009] In some embodiments, a cable storage rack is provided in the manhole on the shore. The cable storage rack includes a cable storage rack stand and pins. Pins are distributed on the cable storage rack stand, and the cable storage rack stand is divided into multiple areas by the pins.

[0010] The submarine cable is wrapped around one side of the cable storage rack, while the bridging cable, terrestrial optical cable, and terrestrial cable are wrapped around the other side of the cable storage rack.

[0011] In some embodiments, the shore-based distribution box is connected to a shore-based distribution box base, and the shore-based distribution box base is provided with a conduit for wiring to enter the manhole on the shore.

[0012] In some embodiments, the manhole access conduit on the shore is connected to the submarine cable, the terrestrial optical cable, and the terrestrial cable, respectively.

[0013] In some embodiments, the manhole is equipped with a manhole route conduit, through which submarine cables, terrestrial optical cables, and terrestrial electrical cables enter the manhole.

[0014] In some embodiments, the end of the submarine cable not connected to the manhole on the shore is secured by a net sleeve.

[0015] A splicing method for a submarine cable splicing device for a shore-based power distribution box of underwater equipment includes the following steps:

[0016] S1. Lay the underwater portion of the submarine cable in accordance with national standards;

[0017] S2. After the submarine cable lands, it is anchored with a mesh sleeve.

[0018] S3. Strip the outer sheath and armored steel wire layer of the submarine cable in the manhole and the distribution box on the shore. After stripping the cable, make a waterproof sheath at this location by rubber vulcanization.

[0019] S4. Pass the vulcanized submarine cable through the manhole route and through the conduit hole into the manhole. Hang the submarine cable in the corresponding position on the cable storage rack in the manhole. Pass one end of the shore-based distribution box through the conduit into the manhole and lead the submarine cable out from the opening above the base of the shore-based distribution box for use.

[0020] S5. Referring to step S above, bring the jumper optical cable, land optical cable and land cable into the other side of the manhole on the shore and lead them out from the opening above the base of the corresponding shore-based distribution box for later use.

[0021] S6. Hoist the shore-based distribution box onto the shore-based distribution box base, remove the cable cover plate of the shore-based distribution box, and sequentially lead out the submarine cable, jumper cable, land optical cable and land cable from the cable cover plate of the shore-based distribution box.

[0022] S7. Fabrication of Watertight Encapsulation Installation Joints: First, strip the inner sheath of the submarine cable and install the watertight encapsulation installation joint. All internal optical fibers of the submarine cable should be sheathed, leaving sufficient length for joint fabrication. Encapsulate the internal optical fibers of the submarine cable with hard sealant up to the inner cavity / area. After the hard sealant has cured, install nylon braided sleeves on the outside of the internal optical fibers of the submarine cable up to the cured area of ​​the hard sealant, and then encapsulate with soft sealant. Next, vulcanize a layer of tapered rubber on the watertight encapsulation installation joint and the outside of the submarine cable. Install the fasteners onto the watertight encapsulation installation joint using sealing washers.

[0023] S8. Introduce the crossover optical cable, terrestrial optical cable and terrestrial cable from the watertight joints corresponding to the cable guide cover of the shore-based distribution box;

[0024] S9. Connect the submarine cable to the data processing equipment in the form of a single-core optical fiber. After data integration, output the data in the form of a two-core optical fiber and connect it to the designated position of the optical fiber adapter. The downstream shore-based power distribution box sends its data to its adjacent upstream shore-based power distribution box through the land optical cable or the cross-link optical cable. Connect the data to the designated position of the optical fiber adapter in the form of a single-core optical fiber. The optical fiber transferred from the downstream and the optical fiber output from the data processing equipment are output in parallel through the optical fiber adapter and are connected to the upstream land optical cable or the cross-link optical cable.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) While meeting the requirements for centralized access and reliable transfer of multiple submarine and terrestrial cables at a single point, this invention reduces the demand for construction work space and land area, and has a strong adaptability to the construction site environment.

[0027] (2) This invention allows for convenient maintenance and repair of multiple cables at the same time, while avoiding the need for excessive manpower and construction equipment;

[0028] (3) This invention also provides better protection for the shore-based power distribution box, extends its service life, and makes maintenance more convenient;

[0029] (4) The system of the present invention retains only one main route, which reduces the amount of construction work and makes it easy to protect and maintain. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a flowchart of the construction operation of the present invention.

[0032] Figure 2 This is a schematic diagram of the "one-to-two" beach manhole and construction procedures of the present invention.

[0033] Figure 3 This is a structural diagram of the "one-to-two" beach manhole of the present invention;

[0034] Figure 4 yes Figure 3 A schematic diagram of a partial structure;

[0035] Figure 5 This is a schematic diagram of the storage of submarine and terrestrial cables according to the present invention.

[0036] Figure 6 This is a structural diagram of the cable storage rack of the present invention.

[0037] Figure 7 This is a schematic diagram of the cable entry connector structure and sealing installation of the present invention.

[0038] Figure 8 This is a schematic diagram of the serial signal connection of the present invention.

[0039] Numbering on the map:

[0040] 1. Hybrid fiber optic submarine cable; 2. Submarine cable anchoring mesh sleeve; 3. Shoreline manhole; 4. Shoreline manhole routing conduit; 5. Shoreline manhole cable storage rack; 6. Shoreline manhole entry conduit; 7. Shore-based distribution box base; 8. Shore-based distribution box; 9. Jumper fiber optic cable; 10. Land fiber optic cable; 11. Land cable; 12. Shoreline distribution box cable guide cover; 13. Watertight potting installation joint; 14. Watertight joint; 15. Cable storage rack support frame; 16. Cable storage rack pin; 17. Internal fiber optic cable of submarine cable; 18. Hard sealant; 19. Nylon braided sleeve; 20. Soft sealant; 21. Conical rubber; 22. Sealing gasket; 23. Fastener; 24. Data processing equipment; 25. Fiber optic adapter frame. Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0042] Example 1

[0043] According to the present invention, a submarine cable splicing device for a shore-based power distribution box for underwater equipment includes a submarine cable 1, a shore manhole 3, a shore-based power distribution box 8, a jumper cable 9, a land optical cable 10, and a land cable 11. The submarine cable 1 extends through one end of the shore manhole 3 into the shore-based power distribution box 8. The jumper cable 9 in the shore-based power distribution box 8 extends into the shore manhole 3, and the jumper cable 9 connects the land optical cable 10 and the land cable 11 respectively. The land optical cable 10 and the land cable 11 extend from the other end of the shore manhole 3.

[0044] The end of the submarine cable 1 that is not connected to the manhole 3 is fixed by a net sleeve 2. The manhole 3 is equipped with a manhole route conduit 4, through which the submarine cable 1, the land optical cable 10, and the land cable 11 enter the manhole 3. The manhole 3 is equipped with a cable storage rack 5, which includes a cable storage rack frame 15 and pins 16. The cable storage rack frame 15 is divided into multiple areas by the pins 16. The submarine cable 1 is wrapped around one side of the cable storage rack frame 15, and the bridging cable 9, the land optical cable 10, and the land cable 11 are wrapped around the other side of the cable storage rack frame 15.

[0045] Submarine cable 1, terrestrial optical cable 10, and terrestrial cable 11 are respectively connected to the shore-based distribution box 8 through the manhole 3 on the shore. They are then connected to the base 7 of the shore-based distribution box 8, and the base 7 is equipped with a conduit 6 for entering the manhole. Preferably, the conduit 6 is connected one-to-one with each of the submarine cable 1, terrestrial optical cable 10, and terrestrial cable 11. The bottom of the shore-based distribution box 8 is equipped with a cable-passing cover 12, and a watertight sealing joint 13 is provided between the submarine cable 1 and the cable-passing cover 12. Preferably, the submarine cable 1 is connected to a watertight encapsulated installation joint 13. A tapered rubber 21 is provided on one side of the submarine cable 1 located on the watertight encapsulated installation joint 13. On the other side of the watertight encapsulated installation joint 13, the internal optical fibers 17 of the submarine cable 1 are respectively connected to a rigid sealant 18 and a nylon braided sleeve 19. A soft sealant 20 is connected to the outside of the rigid sealant 18 and the nylon braided sleeve 19. Watertight joints 14 are provided between the terrestrial optical cable 10 and the terrestrial cable 11 and the cable guide cover 12 of the shore-based distribution box. The shore-based distribution box 8 is equipped with a data processing device 24 and an optical fiber adapter 25. The submarine cable 1 uses the data processing device 24 as a single-core optical fiber. After being integrated by the data processing device 24, the submarine cable 1 outputs as a two-core optical fiber and connects to the optical fiber adapter 25.

[0046] More specifically, such as Figure 5-6In the schematic diagram of the storage of submarine and land cables and the cable rack structure shown, the cable rack 5 in the manhole on the shore adopts a vertical cantilever frame structure. Different storage areas for cables of different specifications are set on both sides of the cable rack frame 15. The heavier submarine cable 1 with a larger bending radius and the lighter crossover optical cable 9, land optical cable 10 and land cable 11 with a smaller bending radius are stored separately. At the same time, the individual cables are separated by pins 16 to avoid confusion and tangling between adjacent cables during construction operations.

[0047] exist Figure 7 In the schematic diagram of the cable entry connector structure and sealing installation shown, the inner sheath of the submarine cable 1 is first stripped and the watertight potting installation connector 13 is installed. All the internal optical fibers 17 of the submarine cable 1 are sheathed and sufficient length is reserved for the joint. The watertight potting installation connector 13 is placed in the position shown in the figure, and hard sealant 18 is poured into its interior to 2 / 3 of the inner cavity. After the hard sealant 18 has cured, nylon braided sleeve 19 is installed on the outside of the main cable core wire to the cured part of the hard sealant 18, and then soft sealant 20 is poured in. Then, a layer of conical rubber 21 is vulcanized on the outside of the watertight potting installation connector 13 and the submarine cable 1, and the sealing gasket 22 and fastener 23 are assembled as shown in the figure.

[0048] exist Figure 8 The schematic diagram of the serial signal connection shows the serial connection relationship between two shore-based power distribution boxes 8, which are configured as one to two. Each of their submarine cables 1 enters the interior of the shore-based power distribution box 8 through the cable guide 12, and then connects to the data processing equipment 24 via single-core optical fibers. After data integration, the data is output via two-core optical fibers and connected to a designated position on the fiber optic adapter 25. Simultaneously, the downstream shore-based power distribution box 8 sends its data to its adjacent upstream shore-based power distribution box 8 via a terrestrial optical cable 10 or a bridging optical cable 9, and then connects to a designated position on the fiber optic adapter 25 via two single-core optical fibers from each distribution box. The number of downstream incoming optical fibers is 2×n, and the two optical fibers output from the current data processing equipment 24 are output in parallel through the fiber optic adapter 25 and connected to the upstream terrestrial optical cable 10 or bridging optical cable 9. This ensures that each distributed power distribution box 8 is connected to the computer room via an independent optical fiber and transmits signals back.

[0049] Example 2

[0050] The present invention also provides a splicing method for a submarine cable splicing device for a shore-based power distribution box of underwater equipment, comprising the following steps:

[0051] S1. Lay the underwater section of submarine cable 1 in accordance with national standards;

[0052] S2 and submarine cable 1 are anchored with netting 2 after landing;

[0053] S3. Strip the outer sheath and armored steel wire layer of the submarine cable 1 in the beach manhole 3 and the shore-based distribution box 8. After stripping the cable, make a waterproof sheath at this location by rubber vulcanization.

[0054] S4. Pass the vulcanized submarine cable 1 through the manhole 4 through the hole in the manhole 3 and hang the submarine cable 1 at the corresponding position in the cable storage rack 5 of the manhole. Pass one end of the shore-based distribution box 8 through the manhole entry pipe 6 and lead the submarine cable 1 out from the opening above the base 7 of the shore-based distribution box for use.

[0055] S5. Referring to step S4 above, bring the jumper optical cable 9, the land optical cable 10 and the land cable 11 from the other side of the beach manhole 3 and bring them out from the opening above the corresponding shore-based distribution box base 7 for later use.

[0056] S6. Hoist the shore-based distribution box 8 onto the shore-based distribution box base 7, remove the cable-through cover 12 of the shore-based distribution box, and sequentially lead out the submarine cable 1, the jumper cable 9, the land optical cable 10 and the land cable 11 from the cable-through cover 12 of the shore-based distribution box.

[0057] S7. Fabrication of Watertight Encapsulation Installation Joint 13: First, strip the inner sheath of the submarine cable 1 and install the watertight encapsulation installation joint 13. All the internal optical fibers 17 of the submarine cable are sheathed and sufficient length is reserved for joint fabrication. Hard sealant 18 is injected into the internal optical fibers 17 of the submarine cable up to 2 / 3 of the inner cavity. After the hard sealant 18 has cured, nylon braided sleeve 19 is installed on the outside of the internal optical fibers 17 of the submarine cable up to the cured hard sealant 18. Then, soft sealant 20 is injected. Then, a layer of conical rubber 21 is vulcanized on the watertight encapsulation installation joint 13 and the outside of the submarine cable 1. Fasteners 23 are installed on the watertight encapsulation installation joint 13 through sealing washers 22.

[0058] S8. The bridging optical cable 9, the land optical cable 10 and the land cable 11 are respectively introduced from the watertight joint 14 corresponding to the cable cover plate 12 of the shore-based distribution box.

[0059] S9. Connect the submarine cable 1 to the data processing equipment 24 in the form of a single-core optical fiber. After data integration, output the data in the form of a two-core optical fiber and connect it to the designated position of the optical fiber adapter 25. The downstream shore-based power distribution box 8 sends its data to its adjacent upstream shore-based power distribution box 8 through the land optical cable 10 or the cross-link optical cable 9. Connect the data in the form of a single-core optical fiber to the designated position of the optical fiber adapter 25. The optical fiber transferred from the downstream and the optical fiber output from the data processing equipment 24 are output in parallel through the optical fiber adapter 25 and are connected to the upstream land optical cable 10 or the cross-link optical cable 9.

[0060] More specifically, in Figure 1-4The construction operation flow and process diagram and the shore manhole structure diagram show that, in the basic engineering construction stage, the first step is to select the project site, choosing an area with good drainage and convenient cable laying to avoid long-term water accumulation inside the manhole and base, which would make maintenance and operation difficult and increase the risk of equipment failure. The first step involves laying the underwater portion of the submarine cable 1 according to national standards. The number of cables laid depends on the actual project situation; in this example, there are four cables. Due to the close spacing between them, a multi-cable-in-the-ditch construction method can be adopted, with a 2-3 times water depth margin reserved at one end of the cable. The second step involves considering factors such as the low stability of the seabed in some areas. After the submarine cable 1 lands, each cable 1 can be anchored with a net sleeve 2 according to relevant national standards to ensure stable and reliable fixation. The third step involves calculating and marking the point where the submarine cable 1 enters the shore manhole 3, and stripping the outer sheath and armor steel of the submarine cable 1 from this point to the shore-based distribution box 8. After stripping the cable, ensure the inner sheath is not damaged. After stripping, apply a waterproof sheath to this area using rubber vulcanization. Proceed to step four: insert the four vulcanized submarine cables 1 sequentially through the manhole 4 into the manhole 3. Ensure the vulcanization is done inside the manhole 3, and hang the cables 1 loosely on the cable rack 5 in the manhole from the inside out. Connect one end of the cable to the shore-based distribution box 8 through the main body of the manhole 3. The pre-installed manhole access conduit 6 on the distribution box base 7 will be used to guide the submarine cable 1 from the opening above the distribution box base 7. Note that only one submarine cable 1 will be run through each manhole access conduit 6. Next, proceed to step five: introduce the bridging optical cable 9, terrestrial optical cable 10, and terrestrial cable 11 from the other side of the manhole 3. Following the same method as the submarine cable 1 installation in the previous step, guide them from the opening above the corresponding shore-based distribution box base 7. Note that only one optical cable will be run through each manhole access conduit 6. This completes the basic construction phase. The next phase can begin after the shore-based distribution box 8 and other equipment and construction machinery arrive on site. Proceed to step six: Carefully place the cable in the trench in the middle of the distribution box base 7. Then, using hoisting, install the shore-based distribution box 8 to its base 7. Remove the cable-passing cover 12 inside the distribution box. With the cooperation of two groups of workers working on the cable storage rack 5 and the distribution box 8, sequentially lead the cable out from the cable-passing cover 12 at the bottom of the distribution box 8, leaving sufficient slack. Ensure the cables do not tangle. After cable laying, take necessary sealing and securing measures at each cable-passing hole. Proceed to step seven, refer to... Figure 7In accordance with the requirements of cable splicing technology, the watertight sealing installation joint 13 between the submarine cable 1 and the cable guide cover 12 of the shore-based distribution box was fabricated on-site, and the installation of the submarine cable 1 and the shore-based distribution box 8 was completed; the terrestrial optical cables 91011 were introduced from the corresponding watertight joints 14 of the cable guide cover 12 of the shore-based distribution box, and then the fabrication of all fiber optic interfaces and terminals in the cabin was completed; proceed to process eight, referring to Figure 8 After completing the serial connection and testing of the optical fiber and power supply core wires, and confirming that everything is working properly, conduct full system line testing.

[0061] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for splicing a shore-based power distribution box sea cable of an underwater equipment, characterized in that, The underwater equipment shore-based power distribution box submarine cable splicing device includes a submarine cable (1), a shore manhole (3), a shore-based power distribution box (8), a jumper cable (9), a land optical cable (10), and a land cable (11). The submarine cable (1) extends through one end of the shore manhole (3) into the shore-based power distribution box (8). The jumper cable (9) in the shore-based power distribution box (8) extends into the shore manhole (3), and the jumper cable (9) connects the land optical cable (10) and the land cable (11) respectively. The land optical cable (10) and the land cable (11) extend from the other end of the shore manhole (3). The connection method includes the following steps: S1. Complete the laying of the underwater section of the submarine cable (1); S2 and submarine cable (1) are anchored with netting (2) after landing; S3. Remove the outer sheath and armored steel wire layer from the submarine cable (1) in the manhole (3) on the shore and the distribution box (8) on the shore. After the cable stripping is completed, a waterproof sheath is made at this location by rubber vulcanization. S4. Pass the vulcanized submarine cable (1) through the hole in the manhole pipe (4) and enter the manhole (3) in the manhole. Hang the submarine cable (1) at the corresponding position of the cable storage rack (5) in the manhole. Pass one end of the shore-based distribution box (8) through the manhole entry pipe (6) and lead the submarine cable (1) out from the opening above the base (7) of the shore-based distribution box for use. S5. Referring to step S4 above, bring the jumper cable (9), land optical cable (10) and land cable (11) into the other side of the manhole (3) on the shore and bring them out from the opening above the corresponding shore distribution box base (7) for later use. S6. Hoist the shore-based distribution box (8) onto the shore-based distribution box base (7), remove the cable-through cover plate (12) of the shore-based distribution box, and lead out the submarine cable (1), the jumper cable (9), the land optical cable (10) and the land cable (11) from the cable-through cover plate (12) of the shore-based distribution box in sequence. S7. Fabricate the watertight sealing installation joint (13) for the submarine cable (1). S8. The jumper cable (9), the land optical cable (10) and the land cable (11) are respectively introduced from the watertight joint (14) corresponding to the cable cover plate (12) of the shore-based distribution box; S9. Connect the submarine cable (1) to the data processing equipment (24) in the form of a single-core optical fiber. After data integration is completed, output the data in the form of a two-core optical fiber and connect it to the designated position of the optical fiber adapter (25). The downstream shore-based power distribution box (8) sends its data to the adjacent upstream shore-based power distribution box (8) through the land optical cable (10) or the jumper cable (9). Connect the data in the form of a single-core optical fiber to the designated position of the optical fiber adapter (25). The optical fiber transferred in from the downstream and the optical fiber output from the data processing equipment (24) are output in parallel through the optical fiber adapter (25) and are transferred with the upstream land optical cable (10) or the jumper cable (9).

2. The splicing method of the subsea equipment onshore distribution box submarine cable splicing device according to claim 1, characterized in that, The bottom of the shore-based distribution box (8) is provided with a shore-based distribution box cable guide plate (12), and a watertight potting installation joint (13) is provided between the submarine cable (1) and the shore-based distribution box cable guide plate (12). The land optical cable (10) and the land cable (11) are respectively provided with watertight joints (14) between them and the shore-based distribution box cable guide plate (12).

3. The splicing method of the subsea equipment onshore distribution box submarine cable splicing device according to claim 2, characterized in that, The submarine cable (1) is connected to the watertight potting installation joint (13). The submarine cable (1) located on one side of the watertight potting installation joint (13) is provided with a tapered rubber (21). The submarine cable (1) located on the other side of the watertight potting installation joint (13) has internal optical fibers (17) connected to hard sealant (18) and nylon braided sleeve (19) respectively. The hard sealant (18) and the nylon braided sleeve (19) are connected to soft sealant (20) on the outside.

4. The splicing method of the subsea equipment onshore distribution box submarine cable splicing device according to claim 1, characterized in that, The shore-based power distribution box (8) is equipped with a data processing device (24) and an optical fiber adapter (25). The submarine cable (1) is connected to the data processing device (24) in the form of a single-core optical fiber. After being integrated by the data processing device (24), the submarine cable (1) is output to the optical fiber adapter (25) in the form of a two-core optical fiber.

5. The splicing method of the subsea equipment onshore power distribution box submarine cable splicing device according to claim 1, characterized in that, The manhole (3) is equipped with a manhole cable storage rack (5). The manhole cable storage rack (5) includes a cable storage rack support (15) and pins (16). The pins (16) are distributed on the cable storage rack support (15). The cable storage rack support (15) is divided into multiple areas by the pins (16). The submarine cable (1) is wound around one side of the cable storage frame (15), and the jumper cable (9), the land optical cable (10) and the land cable (11) are respectively wound around the other side of the cable storage frame (15).

6. The splicing method of the subsea equipment onshore distribution box submarine cable splicing device according to claim 1, characterized in that, The shore-based power distribution box (8) is connected to the shore-based power distribution box base (7), and the shore-based power distribution box base (7) is provided with a shore-based manhole access cable conduit (6).

7. The splicing method of the shore-based power distribution box sea cable splicing device for underwater equipment according to claim 6, characterized in that, The manhole access conduit (6) on the shore is connected to the submarine cable (1), the land optical cable (10) and the land cable (11) respectively.

8. The splicing method of the shore-based power distribution box sea cable splicing device for underwater equipment according to claim 1, characterized in that, The beach manhole (3) is equipped with a manhole route conduit (4), and the submarine cable (1), the land optical cable (10) and the land cable (11) enter the beach manhole (3) through the manhole route conduit (4).

9. The splicing method of the shore-based power distribution box sea cable splicing device for underwater equipment according to claim 1, characterized in that, The end of the submarine cable (1) that is not connected to the manhole (3) on the shore is fixed by the net sleeve (2).

10. The splicing method of the shore-based power distribution box sea cable splicing device for underwater equipment according to claim 1, characterized in that, The specific method for fabricating the watertight sealing installation joint (13) of the submarine cable (1) in S7 is as follows: First, strip the inner sheath of the submarine cable (1) and install the watertight potting installation joint (13). Install the sheath on all the internal optical fibers (17) of the submarine cable and leave enough length to make the joint. Pour hard sealant (18) into the internal optical fibers (17) of the submarine cable to 2 / 3 of the inner cavity. After the hard sealant (18) has cured, install nylon braided sleeve (19) on the outside of the internal optical fibers (17) of the submarine cable to the cured part of the hard sealant (18), and then pour soft sealant (20). Then, vulcanize a layer of conical rubber (21) on the watertight potting installation joint (13) and the outside of the submarine cable (1). Install the fastener (23) on the watertight potting installation joint (13) through the sealing gasket (22).

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