A connection device for a submarine cable and a method of connecting the same

Abstract

The application belongs to the technical field of submarine cable and discloses a connecting device of submarine cable and a connecting method thereof, which comprises a junction box, first and second bite end discs, a connecting screw rod, an encapsulating box, a tearable cylindrical support and a rubber sleeve; the junction box is fixedly connected with copper stranded wire end heads on both sides; the first and second bite end discs are respectively bitten on the armored layers of the cables on both sides and are connected through the connecting screw rod; one end of the connecting screw rod is provided with a variable-diameter end head, which cooperates with inner and outer arc bosses on the end disc to form a wedge-shaped bite structure; when being screwed, the wedge-shaped bite structure can generate an axial self-locking force to realize anchoring of the armored layer; the encapsulating box is sleeved outside the connecting area and is filled with epoxy resin; the tearable cylindrical support is covered outside the encapsulating box and is disintegrated through the tearable support; and the rubber sleeve is shrunk and tightly attached to the encapsulating box and the cable outer sheath to form elastic sealing. The application has the advantages that high mechanical connecting strength and excellent sealing performance can be ensured, installation operation is simplified, and joint manufacturing time is shortened.

Description

Technical Field

[0001] This invention belongs to the field of submarine cable technology, and specifically relates to a connection device and connection method for submarine cables. Background Technology

[0002] Submarine cables (hereinafter referred to as "submarine cables") are core equipment in the process of offshore power transmission, and ensuring their stability during operation is of paramount importance to ensuring the normal operation of power equipment. Due to the limitations of submarine cable manufacturing technology, the length of a single submarine cable cannot meet the laying requirements, and joints must be used for connection. However, because joints do not have a mature manufacturing process and technology compared to the cable itself, their reliability is significantly lower than that of the cable itself. Therefore, improving the performance of submarine cable joints has become one of the key factors for the stable operation of submarine cables.

[0003] There are three main areas for improving the connection performance of submarine cable joints: sealing performance, mechanical connection strength, and installation speed. Currently, the desired goals can be achieved in terms of sealing performance and mechanical connection strength. However, due to the relatively complex connection structure, the required installation time is long, making efficient installation impossible. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a connection device and method for submarine cables. This connection device utilizes a connecting screw with a variable diameter end between a first and second engagement end plate, which, in conjunction with an engagement groove on the plate body having a specific arc-shaped concave-convex structure, achieves self-locking engagement and fixation between the engagement end plate and the armor layer. This ensures high mechanical connection strength while simplifying installation. Furthermore, by using an encapsulation box for epoxy resin potting outside the connection area, combined with a composite sealing structure consisting of a tear-away cylindrical support and a shrinkable rubber sleeve, the technical problem of simultaneously achieving good joint sealing, tensile strength, and installation efficiency is solved.

[0005] The objective of this invention is achieved through the following technical solutions: A connection device for a submarine cable includes a junction box, a first engagement end plate, a second engagement end plate, a connecting screw, an encapsulation box, a tear-off cylindrical support, and a rubber sleeve. The junction box securely connects the copper stranded ends of the submarine cables on both sides into a single unit. The first and second engagement end plates are respectively engaged with the armor layers of the submarine cable on both sides. Each of the first and second engagement end plates has a ring of screw holes, and a connecting screw is inserted through these screw holes to connect them as a whole. The front end of the connecting screw has a constant diameter, while the rear end has a diameter that gradually increases from the inside out. Engaging grooves are provided on the discs corresponding to the screw holes. Each engagement groove includes an outer arc boss and an inner arc boss located on the end face of the disc. The contact surface between the inner arc boss on the first engagement end plate and the front end of the connecting screw has a diameter that gradually decreases from the inside out, while the contact surface between the inner arc boss on the second engagement end plate and the rear end of the connecting screw has a diameter that gradually increases from the inside out. The encapsulation box is composed of two half-body sections that are fastened together. The encapsulation box encapsulates the ends of the submarine cables on both sides and fills them with injection molding through the injection port. The tear-off cylindrical bracket is fitted onto the outside of the submarine cable and the encapsulation box, and the rubber sleeve is wrapped around the outer wall of the tear-off cylindrical bracket.

[0006] The junction box includes two copper half-grooves, which fasten the overlapping ends of the copper stranded wires together and secure them by screwing in fasteners.

[0007] The contact surface between the inner arc boss and the end of the connecting screw has wavy grooves continuously distributed along the axial direction.

[0008] At least four connecting screws are provided between the first and second engagement end plates. Both ends of the connecting screws are threaded. When the connecting screws are tightened from the second engagement end plate toward the first engagement end plate, the front end of the connecting screw abuts against the inner arc boss on the first engagement end plate to engage the armor layer of the submarine cable on one side, and the tail end of the connecting screw abuts against the inner arc boss on the second engagement end plate to engage the armor layer of the submarine cable on the other side.

[0009] The inner arc boss is connected to the disk body by a hinge or a fixed connection.

[0010] The material injected into the packaging box is epoxy resin.

[0011] The tearable cylindrical support is composed of a cylindrical structure made of a continuous spiral plastic strip. The spirals of the plastic strip are tightly fitted together and have fusion points to form a whole. The tearable end of the plastic strip extends from the front end inside the tearable cylindrical support to the rear end and protrudes outward. By tearing the tearable end of the plastic strip, the tearable cylindrical support can be gradually disassembled and pulled out. After being detached from the support of the tearable cylindrical support, the rubber sleeve retracts and adheres tightly to the encapsulation box and the outer sheath of the submarine cable on both sides.

[0012] A connection method relating to a connection device for any of the aforementioned submarine cables includes the following steps: S1: Trim the ends of the submarine cables on both sides so that the copper stranded ends and armor layer of the submarine cables protrude from the end face. S2: The rubber sleeve is fitted onto the tear-off cylindrical bracket, and the tear-off cylindrical bracket is pre-fitted onto the end of the submarine cable on one side. S3: The first and second engagement end plates are respectively fitted onto the armor layer of the submarine cable on both sides; a connecting screw is pre-screwed into the disc body of the second engagement end plate; S4: Connect the ends of the copper stranded wires on both sides and fix them in place using a junction box; S5: Screw each of the connecting screws on the second engagement end plate into the screw holes on the first engagement end plate. The front end of the connecting screw presses against the inner arc boss on the first engagement end plate to engage the armor layer of the submarine cable on one side. The tail end of the connecting screw presses against the inner arc boss on the second engagement end plate to engage the armor layer of the submarine cable on the other side. S6: Set up a packaging box in the connection area and on both sides and fasten it. Then, inject epoxy resin into the enclosed cavity through the injection port of the packaging box and let it solidify. S7: Move the tear-off cylindrical bracket and the rubber sleeve located on one side to the position covering the packaging box, and then tear the plastic strip tear end of the tear-off cylindrical bracket to gradually disassemble and pull out the tear-off cylindrical bracket. After the rubber sleeve is separated from the support of the tear-off cylindrical bracket, it shrinks and sticks tightly to the packaging box and the outer sheath of the submarine cable on both sides to form a seal.

[0013] The advantages of this invention are: (1) The armor layers of the cables on both sides are engaged by the first and second engagement end plates respectively, and the wedge-shaped engagement structure formed by the variable diameter ends of the connecting screw and the inner and outer arc bosses on the end plates generates an axial self-locking force when the screw is tightened, which firmly clamps the armor layer. At the same time, the wave groove set on the inner arc boss increases the friction coefficient of the contact surface, further improving the anti-slip capability, effectively solving the problem of armor wire slippage or breakage caused by insufficient anchoring force in traditional joints, and ensuring that the joint can withstand the huge axial load during deep-sea laying and operation.

[0014] (2) This invention eliminates the complex processes of traditional lead sealing and welding. The armor layer can be fixed simply by tightening the connecting screws, making the operation convenient. At the same time, the installation of the rubber sleeve adopts a pre-fitted design with a tear-off bracket, eliminating the need for heat shrink or large compression equipment. During installation, the rubber sleeve automatically shrinks into place simply by removing the bracket. The entire installation process is clear and simple, significantly reducing the reliance on special tools and skilled workers, effectively shortening the joint fabrication and repair time, and meeting the needs of rapid response at sea. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the submarine cable in this invention; Figure 2 This is a schematic diagram of the connection between the ends of the submarine cable in this invention; Figure 3 For the present invention Figure 2 Detailed drawing at point A in the diagram; Figure 4 This is a schematic diagram of the assembly of the packaging box in this invention; Figure 5 This is a schematic diagram of the tear-off cylindrical support assembly at the joint position in this invention; Figure 6 This is a schematic diagram of the present invention showing how the tear-off cylindrical support is removed to allow the rubber sleeve to wrap around the packaging box. Figure 7 This is a perspective view of the tear-off cylindrical support in this invention; As shown in the figures, the markings in the figures are as follows: 1. Copper stranded wire; 2. Conductor shielding layer; 3. Insulation layer; 4. Insulation shielding layer; 5. Water-blocking buffer layer; 6. Metal sheath layer; 7. Inner sheath layer; 8. Armor layer; 9. Outer sheath; 10. Disc body; 11. Outer arc boss; 12. Inner arc boss; 13. Screw hole; 14. Connecting screw; 15. First engagement end plate; 16. Second engagement end plate; 17. Junction box; 18. Encapsulation box; 19. Injection port; 20. Tear-off cylindrical bracket; 21. Rubber sleeve. Detailed Implementation

[0016] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: Example: Figures 1-7 As shown, this embodiment specifically relates to a connection device for a submarine cable. The submarine cable, from the inside out, consists of a copper stranded wire 1, a conductor shielding layer 2, an insulation layer 3, an insulation shielding layer 4, a water-blocking buffer layer 5, a metal sheath layer 6, an inner sheath layer 7, an armor layer 8, and an outer sheath 9. The copper stranded wire 1 is composed of multiple copper wires twisted together, serving as the core channel for current transmission. The conductor shielding layer 2 (inner semi-conductive layer) uses a semi-conductive material (polyethylene containing carbon black) to eliminate electric field concentration caused by gaps between strands on the conductor surface, transforming the electric field from a "multi-faceted" to a "uniform cylindrical surface" distribution, thus preventing partial discharge. The insulation layer 3 uses XLPE cross-linked polyethylene for main insulation—the core barrier that withstands phase voltage. The insulation shielding layer 4 (outer semi-conductive layer) is used to ensure insulation... The electric field distribution is uniform on both the inner and outer sides of the layer to prevent interface discharge; the water-blocking buffer layer 5 (water-blocking strip) is a semi-conductive water-blocking strip (containing superabsorbent polymer resin SAP) for longitudinal water blocking and thermal expansion buffering; the metal sheath layer 6 is a lead alloy / aluminum sheath for radial waterproof barrier and short-circuit current path; the inner sheath layer 7 is PE / HDPE, serving as corrosion protection for the metal sheath layer 6 and as an armor lining; the armor layer 8 is a non-magnetic metal wire, which withstands the axial tensile force during laying (requiring a breaking force ≥1200kN), as well as external forces such as ocean current impact, anchor damage, and fishing net dragging during operation; the outer sheath 9 is made of PE / PP, polyethylene (PE) or polypropylene (PP) sheath, resisting seawater corrosion and marine organism attachment, and protecting the armor layer from direct wear.

[0017] like Figures 1-7 As shown, the connecting device includes a junction box 17, a first engagement end plate 15, a second engagement end plate 16, a connecting screw 14, a packaging box 18, a tear-off cylindrical bracket 20, and a rubber sleeve 21.

[0018] like Figure 2 , Figure 3 As shown, junction box 17 securely connects the ends of the copper stranded wires 1 of the submarine cables on both sides into a single unit. Specifically, junction box 17 includes two copper semi-grooves, which interlock the overlapping ends of the copper stranded wires 1 and secure them by screwing in fasteners. The inner wall of the copper semi-grooves may be provided with anti-slip textures or grooves to increase the contact area and gripping force with the copper stranded wires, ensuring the reliability of the conductive connection.

[0019] like Figure 2 , Figure 3As shown, the first engagement end plate 15 and the second engagement end plate 16 respectively engage with the armor layer 8 of the submarine cable on both sides. Each of the disc bodies 10 of the first engagement end plate 15 and the second engagement end plate 16 has a ring of screw holes 13, and the two end plates are connected as a whole by connecting screws 14 passing through the screw holes 13 of the two disc bodies 10. In this embodiment, four connecting screws 14 are provided between the first engagement end plate 15 and the second engagement end plate 16 (six or eight can be provided according to actual needs, preferably evenly distributed), and both ends of the connecting screws 14 are threaded. The front end of the connecting screw 14 is a fixed diameter end, and the tail end of the connecting screw 14 is a tapered end whose diameter gradually increases from the inside to the outside. It should be noted that the axial direction from the inside to the outside here refers to the direction from the joint area towards one side of the submarine cable, such as... Figure 3 As shown, a meshing groove is provided on the disc body 10 corresponding to the position of the screw hole 13. The meshing groove includes an outer arc boss 11 and an inner arc boss 12 located on the end face of the disc body 10. The axial diameter of the contact surface between the inner arc boss 12 on the first meshing end disc 15 and the front end of the connecting screw 14 gradually decreases from the inside to the outside; the axial diameter of the contact surface between the inner arc boss on the second meshing end disc 16 and the tail end of the connecting screw 14 gradually increases from the inside to the outside. When the connecting screw 14 is tightened from the second engagement end plate 16 toward the first engagement end plate 15, the front end of the connecting screw 14 presses against the inner arc boss 12 on the first engagement end plate 15, causing it to deform toward the armor layer 8 to engage the armor layer 8 of the submarine cable on one side. The tail end of the connecting screw 14 presses against the inner arc boss 12 on the second engagement end plate 16, causing it to deform toward the armor layer 8 to engage the armor layer 8 of the submarine cable on the other side. When tightened, an axial self-locking force can be generated to achieve the anchoring of the armor layer.

[0020] like Figure 2 , Figure 3 As shown, in a preferred embodiment, the contact surface between the inner arc boss 12 and the end of the connecting screw 14 has wavy grooves continuously distributed along the axial direction. This increases the friction coefficient between the connecting screw 14 and the inner arc boss 12, increasing the axial locking force while tightening. Furthermore, a serrated surface is also provided between the contact surface between the inner arc boss 12 and the armor layer 8 to significantly increase the friction coefficient between them, preventing slippage of the armor wire under axial tension and further improving the reliability of the anchoring. The inner arc boss 12 and the disc body 10 can be connected by a hinge or a fixed connection. When a hinged connection is used, the inner arc boss 12 can adaptively rotate a certain angle as the connecting screw 14 is tightened, ensuring that its contact surface with the armor layer 8 is always in optimal contact, further improving the uniformity and reliability of the engagement.

[0021] like Figure 4As shown, the encapsulation box 18 consists of two interlocking half-bodies (the two half-bodies can be detachably connected by snaps, bolts, or hinges). The encapsulation box 18 encapsulates the ends of the submarine cable on both sides and fills them with epoxy resin through the injection port 19. The material injected into the encapsulation box 18 is epoxy resin. After curing, the epoxy resin forms a rigid sealing barrier, which can effectively prevent the infiltration of external seawater and provide a certain degree of mechanical protection for the joint area. Sealing rings or sealing tape can be installed between the two ends of the encapsulation box 18 and the outer sheath 9 of the submarine cable to prevent the epoxy resin from leaking before curing. The injection port 19 can be set on the top or side wall of the encapsulation box 18, and an exhaust port can be set on the bottom or opposite side wall of the encapsulation box 18 to ensure that the air in the cavity can be smoothly discharged during the injection process, ensuring that the epoxy resin is filled tightly and without air bubbles.

[0022] like Figures 5-7 As shown, the tear-off cylindrical support 20 is fitted onto the area of ​​the encapsulation box 18 and the submarine cables on both sides, with a rubber sleeve 21 wrapped around the outer wall of the tear-off cylindrical support 20. The tear-off cylindrical support 20 is a cylindrical structure composed of a continuous spiral plastic strip (such as polyethylene or polypropylene). The spirals of the plastic strip are tightly fitted together and have welded points to form a whole. The tear-off end of the plastic strip extends from the front end inside the tear-off cylindrical support 20 to the rear end and protrudes outward. By tearing the tear-off end of the plastic strip, the spiral structure gradually unwinds, causing the tear-off cylindrical support 20 to gradually disintegrate and be pulled out from inside the rubber sleeve 21. The rubber sleeve 21 can be made of rubber material with high elasticity and good seawater resistance (such as neoprene rubber or EPDM rubber). After being released from the support of the tear-off cylindrical support 20, the rubber sleeve 21 contracts elastically and adheres tightly to the encapsulation box 18 and the outer sheath 9 of the submarine cables on both sides, forming an elastic sealing transition layer. The inner diameter of the rubber sleeve 21 should be smaller than the outer diameter of the encapsulation box 18 and the outer sheath 9 in the free state to ensure sufficient radial sealing pressure after shrinkage.

[0023] like Figures 1-7 As shown, this embodiment also relates to a connection method for the above-mentioned submarine cable connection device, including the following steps: S1: Trim the ends of the submarine cables on both sides so that the copper stranded wire 1 and the armor layer 8 protrude from the end face. Specifically, use a special stripping tool to remove the outer sheath 9, inner sheath layer 7, metal sheath layer 6, water-blocking buffer layer 5, insulating shield layer 4, insulating layer 3, and conductor shield layer 2 in sequence, exposing an appropriate length of copper stranded wire 1, while also exposing the armor layer 8 to a certain length. During the trimming process, ensure that the end faces of each layer are flat and free of burrs to avoid damaging the internal structure.

[0024] S2: Fit the rubber sleeve 21 onto the tear-off cylindrical bracket 20, and pre-fit the tear-off cylindrical bracket 20 onto one side of the end of the submarine cable. Specifically, first fit the tear-off cylindrical bracket 20 onto the cable, then slip the rubber sleeve 21 onto the cable end and wrap it around the outside of the tear-off cylindrical bracket 20, and then move the two together as a whole along the cable to the side away from the joint area, leaving operating space for subsequent joint fabrication.

[0025] S3: The first engagement end plate 15 and the second engagement end plate 16 are respectively fitted onto the armor layers 8 of the submarine cable on both sides. The connecting screw 14 is pre-screwed into the disc body 10 of the second engagement end plate 16. During the fitting process, the steel wires of the armor layer 8 should be evenly distributed in the engagement grooves of the disc body 10. Specifically, the steel wires of the armor layer 8 can be evenly distributed in the circumferential direction before fitting onto the engagement end plate, ensuring that each steel wire is embedded in the engagement groove between the outer arc boss 11 and the inner arc boss 12.

[0026] S4: Connect the ends of the two copper stranded wires 1 together and secure them using the junction box 17. During connection, the two copper stranded wires 1 can be overlapped or plugged in. Then, the two copper half-grooves of the junction box 17 are fastened to the overlap, and the copper stranded wires 1 are pressed and secured by tightening fasteners (such as bolts or screws). The tightening torque of the fasteners should be strictly controlled to ensure that the contact resistance meets the requirements and does not damage the copper stranded wires.

[0027] S5: Screw the connecting screws 14 on the second engagement end plate 16 into the screw holes 13 on the first engagement end plate 15. During the tightening process, the front end of the connecting screw 14 (the end with a constant diameter) presses against the inner arc boss 12 on the first engagement end plate 15. The axial diameter of the contact surface between the inner arc boss 12 and the front end of the connecting screw 14 gradually decreases from the inside to the outside, thereby generating a radial component force during tightening. Under the pressure of the front end of the connecting screw 14, the inner arc boss 12 presses against the armor layer 8. Simultaneously, the tail end (conical end) of the connecting screw 14 presses against the inner arc boss 12 on the second engagement end plate 16. The axial diameter of the contact surface between the inner arc boss 12 and the tail end of the connecting screw 14 gradually increases from the inside to the outside, generating a radial component force during tightening. The tail end (conical end) of the connecting screw 14 presses against the inner arc boss of the second engagement end plate 16 to compress the armor layer 8. It should be noted that during the tightening process of the connecting screw 14, a special tool can be used to clamp the two engagement end plates to ensure that they do not move axially and maintain a constant distance.

[0028] S6: An encapsulation box 18 is installed in the connection area and on both sides, and then snapped shut. Epoxy resin is then poured into the enclosed cavity through the injection port 19 of the encapsulation box 18 and allowed to solidify. Before snapping shut the encapsulation box 18, the surface of the cable outer sheath 9 should be cleaned and roughened to improve the adhesion between the epoxy resin and the outer sheath. During epoxy resin pouring, it should be slowly injected from the bottom injection port, stopping when resin overflows from the top vent to ensure complete removal of air from the cavity. The curing time and temperature of the epoxy resin should be strictly controlled according to the product instructions.

[0029] S7: Move the tear-off cylindrical bracket 20 and rubber sleeve 21 located on one side to cover the encapsulation box 18. During movement, avoid relative rotation between the rubber sleeve 21 and the encapsulation box 18 to prevent damage to the inner wall of the rubber sleeve. Then, tear off the plastic strip of the tear-off cylindrical bracket 20. Under tension, the plastic strip gradually unwinds in a spiral direction, causing the tear-off cylindrical bracket 20 to gradually disintegrate and be pulled out from the gap between the rubber sleeve 21 and the encapsulation box 18. As the bracket is removed, the rubber sleeve 21 contracts under its own elastic restoring force, tightly wrapping around the encapsulation box 18 and the outer sheath 9 of the submarine cable on both sides. The elastic contraction force of the rubber sleeve 21 forms an effective radial seal, completing the entire connection process.

[0030] The beneficial effects of this embodiment are: (1) The armor layers of the cables on both sides are engaged by the first and second engagement end plates respectively, and the wedge-shaped engagement structure formed by the variable diameter ends of the connecting screw and the inner and outer arc bosses on the end plates generates an axial self-locking force when the screw is tightened, which firmly clamps the armor layer. At the same time, the wave groove set on the inner arc boss increases the friction coefficient of the contact surface, further improving the anti-slip capability, effectively solving the problem of armor wire slippage or breakage caused by insufficient anchoring force in traditional joints, and ensuring that the joint can withstand the huge axial load during deep-sea laying and operation.

[0031] (2) This invention eliminates the complex processes of traditional lead sealing and welding. The armor layer can be fixed simply by tightening the connecting screws, making the operation convenient. At the same time, the installation of the rubber sleeve adopts a pre-fitted design with a tear-off bracket, eliminating the need for heat shrink or large compression equipment. During installation, the rubber sleeve automatically shrinks into place simply by removing the bracket. The entire installation process is clear and simple, significantly reducing the reliance on special tools and skilled workers, effectively shortening the joint fabrication and repair time, and meeting the needs of rapid response at sea.

Claims

1. A connection device for a submarine cable, characterized in that... The connecting device includes a junction box, a first engagement end plate, a second engagement end plate, a connecting screw, an encapsulation box, a tear-off cylindrical support, and a rubber sleeve; the junction box fixes the copper stranded wire ends of the submarine cables on both sides into a whole; the first engagement end plate and the second engagement end plate respectively engage with the armor layer of the submarine cables on both sides; each of the first engagement end plate and the second engagement end plate has a ring of screw holes, and the connecting screw is inserted through the screw holes of the two plates to connect them into a whole, the front end of the connecting screw has a constant diameter, and the tail end of the connecting screw has a diameter that gradually increases from the inside to the outside axially; the disc body A meshing groove is provided corresponding to the position of the screw hole. The meshing groove includes an outer arc boss and an inner arc boss located on the end face of the disc. The axial diameter of the contact surface between the inner arc boss on the first meshing end disc and the front end of the connecting screw gradually decreases from the inside to the outside. The axial diameter of the contact surface between the inner arc boss on the second meshing end disc and the tail end of the connecting screw gradually increases from the inside to the outside. The encapsulation box is composed of two half-body snap-fits. The encapsulation box encapsulates the ends of the submarine cable on both sides and fills them with injection molding through the injection port. The tear-off cylindrical bracket is fitted on the outside of the submarine cable and the encapsulation box. The rubber sleeve is wrapped around the outer wall of the tear-off cylindrical bracket. The contact surface where the inner arc boss contacts the end of the connecting screw has wavy grooves continuously distributed along the axial direction. At least four connecting screws are provided between the first and second engagement end plates. Both ends of the connecting screws are threaded. When the connecting screws are tightened from the second engagement end plate toward the first engagement end plate, the front end of the connecting screw abuts against the inner arc boss on the first engagement end plate to engage the armor layer of the submarine cable on one side, and the tail end of the connecting screw abuts against the inner arc boss on the second engagement end plate to engage the armor layer of the submarine cable on the other side. The tearable cylindrical support is composed of a cylindrical structure made of a continuous spiral plastic strip. The spirals of the plastic strip are tightly fitted together and have fusion points to form a whole. The tearable end of the plastic strip extends from the front end inside the tearable cylindrical support to the rear end and protrudes outward. By tearing the tearable end of the plastic strip, the tearable cylindrical support can be gradually disassembled and pulled out. After being detached from the support of the tearable cylindrical support, the rubber sleeve retracts and adheres tightly to the encapsulation box and the outer sheath of the submarine cable on both sides.

2. The connection device for a submarine cable according to claim 1, characterized in that... The junction box includes two copper half-grooves, which fasten the overlapping ends of the copper stranded wires together and secure them by screwing in fasteners.

3. The connection device for a submarine cable according to claim 1, characterized in that... The inner arc boss is connected to the disk body by a hinge or a fixed connection.

4. A connection device for a submarine cable according to claim 1, characterized in that... The material injected into the packaging box is epoxy resin.

5. A connection method relating to a connection device for a submarine cable as described in any one of claims 1-4, characterized in that... The connection method includes the following steps: S1: Trim the ends of the submarine cables on both sides so that the copper stranded ends and armor layer of the submarine cables protrude from the end face. S2: The rubber sleeve is fitted onto the tear-off cylindrical bracket, and the tear-off cylindrical bracket is pre-fitted onto the end of the submarine cable on one side. S3: The first and second engagement end plates are respectively fitted onto the armor layer of the submarine cable on both sides; a connecting screw is pre-screwed into the disc body of the second engagement end plate; S4: Connect the ends of the copper stranded wires on both sides and fix them in place using a junction box; S5: Screw each of the connecting screws on the second engagement end plate into the screw holes on the first engagement end plate. The front end of the connecting screw presses against the inner arc boss on the first engagement end plate to engage the armor layer of the submarine cable on one side. The tail end of the connecting screw presses against the inner arc boss on the second engagement end plate to engage the armor layer of the submarine cable on the other side. S6: Set up a packaging box in the connection area and on both sides and fasten it. Then, inject epoxy resin into the enclosed cavity through the injection port of the packaging box and let it solidify. S7: Move the tear-off cylindrical bracket and the rubber sleeve located on one side to the position covering the packaging box, and then tear the plastic strip tear end of the tear-off cylindrical bracket to gradually disassemble and pull out the tear-off cylindrical bracket. After the rubber sleeve is separated from the support of the tear-off cylindrical bracket, it shrinks and sticks tightly to the packaging box and the outer sheath of the submarine cable on both sides to form a seal.

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