Submarine cable sheath repairing and protecting device and method

Abstract

The invention discloses a submarine cable sheath repairing and protecting device and method. The submarine cable sheath repairing and protecting device comprises a steel wire anchoring module, a sealing pressure-bearing module, a bending limiter and a connecting structure. The steel wire anchoring module is provided with an outer conical seat, an inner conical shaft and a conical sleeve, the conical sleeve expands in the radial direction by driving the inner conical shaft to move in the axial direction, and the armored steel wire is pressed and anchored through cooperation of double conical surfaces. The sealing pressure-bearing module is composed of a split type outer shell and an inner shell, and multiple sealing elements are arranged between the outer shell and the inner shell to form a sealing cavity for containing the cable connector. A bend limiter is mounted to an end of the outer housing. The steel wire anchoring module and the sealing pressure-bearing module are fixedly connected through the connecting structure. During assembly, steel wire anchoring, sealing module assembly, module integration and bending limiter installation are sequentially carried out. The device is reliable in structure, good in anchoring and sealing performance, convenient to assemble on site and suitable for submarine optical cable sheath repairing operation.

Description

Technical Field

[0001] This invention relates to the fields of marine engineering and optical communication technology, and in particular to a device and method for repairing and protecting submarine cable sheaths. Background Technology

[0002] Submarine optical cables play a vital role in international communication backbone channels, and their operational reliability is of paramount importance. The armored steel wire layer in the cable structure is the main load-bearing element that withstands the tension during laying and operation. When the outer sheath of the optical cable is damaged while the internal optical fibers remain intact, the sheath must be repaired to restore the overall mechanical strength and radial sealing performance of the cable.

[0003] Currently, most common submarine optical cable repair devices employ mechanical clamps for direct clamping or encapsulation with sealant. These technologies have several limitations in practical applications. Mechanical clamps rely on initial preload to maintain the clamping state; under long-term marine environmental vibrations, water flow impacts, and dynamic loads, the clamping force may weaken or even loosen, leading to decreased anchoring reliability. Regarding sealing, relying on single-material or single-structure sealing methods can gradually deteriorate under the influence of deep-sea high-pressure periodic fluctuations, temperature changes, and natural material aging, posing a risk of leakage. Furthermore, the overall tensile strength of existing repair devices often does not match the original optical cable sufficiently, potentially becoming a weak point in complex mechanical environments. From an engineering implementation perspective, many existing devices are complex in structure and have numerous components, hindering rapid on-site assembly and disassembly under harsh marine conditions, thus affecting the efficiency and success rate of repair operations. A particularly prominent technical challenge lies in the anchoring of the armored steel wire: how to achieve a clamping mechanism that can adapt to high tensile loads, has self-locking characteristics, and applies sufficient clamping force to the steel wire while avoiding damage to its surface in a corrosive seawater environment remains a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a device and method for repairing and protecting submarine cable sheaths.

[0005] A submarine cable sheath repair and protection device, comprising: Steel wire anchoring module, sealing pressure-bearing module, bending limiter and connection structure; The wire anchoring module includes an outer conical seat, an inner conical shaft, and a conical sleeve. The outer conical seat has an inner conical hole, the inner conical shaft is disposed in the inner conical hole, and the conical sleeve is sleeved outside the inner conical shaft. The mating surface between the inner conical shaft and the conical sleeve is a first conical surface, and the mating surface between the conical sleeve and the inner conical hole of the outer conical seat is a second conical surface. The sealing pressure-bearing module includes a split outer shell and a split inner shell, the inner shell being disposed inside the outer shell, together forming a sealed cavity for accommodating the cable connector; a sealing element is provided between the inner shell and the outer shell; The bending limiter is connected to the end of the outer housing; The connection structure securely connects the wire anchoring module to the sealing pressure-bearing module.

[0006] Furthermore, the taper of both the first and second conical surfaces is between 8° and 12°.

[0007] Furthermore, the wire anchoring module also includes a top block and a connecting plate; the connecting plate drives the top block through fasteners, causing the top block to push the inner conical shaft to generate axial displacement.

[0008] Furthermore, the connecting plate is provided with screws, and when the screws are tightened, they directly or indirectly push the top block, thereby driving the inner cone shaft to move axially.

[0009] Furthermore, the sealing element includes an end sealing assembly disposed on the end face of the cylinder and at least one planar sealing strip disposed on the split mating surface of the inner shell; the end sealing assembly includes multiple layers of gaskets and sealing pads stacked sequentially.

[0010] Furthermore, the planar sealing strip is embedded in the sealing groove of the inner housing, and the sealing gasket is provided with a positioning hole for the end of the planar sealing strip to be inserted.

[0011] Furthermore, the outer shell is composed of an upper outer cylinder and a lower outer cylinder, which are engaged with fasteners via positioning pins; the inner shell is composed of an upper inner cylinder and a lower inner cylinder, which are engaged with fasteners via positioning pins. A method for repairing and protecting submarine cable sheaths, applied to the submarine cable sheath repair and protection device as described in any one of the preceding claims, is characterized by comprising the following steps: The armored steel wires of the submarine cable are distributed in the inner conical hole of the outer conical seat. By driving the inner conical shaft to move axially, the conical sleeve expands radially, thereby anchoring the steel wires between the outer conical seat and the conical sleeve. Place the lower half of the inner housing on the lower half of the outer housing, install the sealing element, close the upper half of the inner housing and secure it. The upper part of the outer shell is covered and fixed on the lower part to form a sealed pressure-bearing module; The wire anchoring module, which has already been anchored, is fixedly installed to the sealing pressure-bearing module through a connecting structure; The bend limiter is installed at the end of the outer housing.

[0012] Furthermore, the step of driving the inner conical shaft to move axially is achieved by tightening the fasteners on the connecting plate, pushing the top block, and the top block pushing the inner conical shaft to generate displacement.

[0013] Furthermore, the step of installing the sealing element includes: sequentially installing multiple layers of gaskets and sealing gaskets on the end face of the cylinder to form an end seal; installing a flat sealing strip in the sealing groove of the split mating surface of the inner shell, and inserting the end of the flat sealing strip into the positioning hole of the sealing gasket.

[0014] The beneficial effects of this invention are: The submarine cable sheath repair and protection device provided by this invention effectively improves the reliability and long-term stability of anchoring by employing a steel wire anchoring module with a specific conical surface fit. This module utilizes a double-conical self-locking structure composed of an inner conical shaft, a conical sleeve, and an outer conical seat. After applying an initial preload, its clamping force further increases with the increase of the external cable tension. This mechanical design based on the friction self-locking principle, compared to traditional mechanical clamps that rely on constant preload, is better able to adapt to long-term vibration, impact, and alternating loads in a marine environment, thereby achieving stable and damage-free anchoring of the armored steel wire and giving the repaired connection a higher tensile load-bearing capacity.

[0015] The sealing pressure-bearing module of this invention significantly enhances the sealing reliability and structural integrity of the repair joint in the high-pressure environment of deep sea through the coordinated design of split inner and outer shells and multiple sealing elements. Both the outer and inner shells adopt a split structure, facilitating the precise installation and inspection of the internal seals. The sealing system integrates multi-layer gasket sealing at the ends and split-face planar sealing, with the planar sealing strip and the end sealing gasket forming a structural connection through an interlocking method, constituting a redundant sealing barrier. This design can more effectively resist the infiltration of high-pressure seawater, pressure fluctuations, and possible material creep, providing a dry, safe, and long-term protective environment for the internal fiber optic connector.

[0016] Furthermore, the modular design and optimized assembly process of the device significantly improve the feasibility and efficiency of on-site operations at sea. The steps of wire anchoring, sealing construction, and final integration are logically clear, and the major components adopt a modular structure, facilitating transportation, hoisting, and rapid assembly. The integrated installation of the bend limiter further protects the joint area, preventing failure due to excessive bending. Therefore, this device not only solves the technical difficulties of traditional repair methods in anchoring, sealing, and tensile strength matching, but its structural design also fully considers the construction constraints under harsh marine conditions, thereby improving the overall success rate and long-term operational reliability of submarine cable repair operations. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of an embodiment of a submarine cable sheath repair and protection device according to the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of an embodiment of a submarine cable sheath repair and protection device according to the present invention.

[0019] Figure 3 This is a structural diagram of the cable head clamping in an embodiment of a submarine cable sheath repair and protection device of the present invention.

[0020] Figure 4 This is a force analysis diagram illustrating the steel wire anchoring principle of an embodiment of a submarine cable sheath repair and protection device according to the present invention.

[0021] Figure 5 This is a schematic diagram of the outer cylinder in an embodiment of a submarine cable sheath repair and protection device of the present invention.

[0022] Figure 6 This is a schematic diagram of the bending limiter in an embodiment of a submarine cable sheath repair and protection device of the present invention.

[0023] Figure 7 This is a flowchart of a method for repairing and protecting a submarine cable sheath using the device of the present invention. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-7 The preferred embodiments of the present invention will be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0025] The submarine optical cable sheath repair and protection device mainly includes a wire anchoring module, a sealing pressure-bearing module, a bending limiter 1, and a connecting structure. The wire anchoring module is used to reliably anchor the armored steel wires 18 of the damaged submarine cable 17. Its core components include an outer conical seat, an inner conical shaft 5, and a conical sleeve 4. An inner conical hole is machined inside the outer conical seat. The inner conical shaft 5 is placed inside this inner conical hole. The conical sleeve 4 is fitted onto the outside of the inner conical shaft 5. The mating surface between the inner conical shaft 5 and the conical sleeve 4 is the first conical surface. The mating surface between the conical sleeve 4 and the inner conical hole of the outer conical seat is the second conical surface. When the inner conical shaft is subjected to axial thrust, the first conical surface forces the conical sleeve 4 to expand radially, thereby using the second conical surface to press and lock the armored steel wires 18 distributed around it onto the inner conical hole wall of the outer conical seat, forming a self-locking effect.

[0026] To drive the inner conical shaft 5, the wire anchoring module may also include a top block 6 and a connecting plate 7. The connecting plate 7 can be secured with threaded fasteners. Tightening the fasteners on the connecting plate 7 pushes the connected top block 6 to move. The displacement of the top block 6 acts directly on the end of the inner conical shaft 5, thereby providing the required axial thrust to the inner conical shaft 5. The taper of the first and second conical surfaces is designed within a specific range, such as between eight and twelve degrees. This angle range is beneficial for achieving frictional self-locking after applying preload and further enhancing the anchoring force when subjected to cable tension.

[0027] The pressure-sealing module provides mechanical protection and a pressure-sealed environment for the repaired cable splice. This module has a split structure, consisting of an outer shell and an inner shell. The outer shell is typically formed by the mating of an upper outer cylinder 8 and a lower outer cylinder 9. The inner shell also has a split design, consisting of an upper inner cylinder 15 and a lower inner cylinder. The entire inner shell is placed within the internal cavity of the outer shell, together forming a closed, sealed cavity to accommodate and protect the optical cable splice.

[0028] A sealing element is provided between the inner and outer shells to form a multi-stage seal. The sealing element mainly includes an end sealing assembly and a flat sealing strip. The end sealing assembly is installed in the end face sealing groove of the cylinder and is generally composed of multiple layers of gaskets and elastic sealing gaskets 13 stacked sequentially between the gaskets. The flat sealing strip is installed on the dividing plane where the upper and lower halves of the inner shell meet, and a sealing groove is formed on this plane. The flat sealing strip is embedded in this sealing groove. To further improve sealing reliability, a positioning hole can be formed on the elastic sealing gasket. During installation, the end of the flat sealing strip can be inserted into the positioning hole, thereby achieving structural association and positioning between the end face seal and the flat seal.

[0029] The upper and lower halves of the outer shell, as well as the upper and lower halves of the inner shell, are precisely positioned using locating pins and secured with fasteners. This modular design facilitates on-site assembly and disassembly. The bend limiter 1 is fastened to the outer side of the outer shell end; its function is to limit the bending radius of the submarine cable near the repair point, preventing secondary damage due to excessive bending. The connection structure, typically using screws, securely connects the wire anchoring module (with completed wire anchoring) to the assembled sealing and pressure-bearing module as a single unit.

[0030] The assembly method of this submarine cable sheath repair and protection device follows this logical sequence. First, wire anchoring is performed. The armored steel wires of the submarine cable are straightened and evenly distributed around the inner conical hole of the outer conical seat. Then, the inner conical shaft assembly with the conical sleeve is inserted into the inner conical hole. Tightening the fasteners on the connecting plate drives the top block and inner conical shaft, causing the conical sleeve to expand radially and compress the steel wire. Next, a sealing pressure-bearing module is constructed. The lower half of the inner shell is placed on the lower half of the outer shell. Multiple layers of gaskets and sealing gaskets are installed at the ends. A flat sealing strip is inserted into the sealing groove of the inner shell's segmented surface, with its end inserted into the hole of the sealing gasket. The upper half of the inner shell is then closed and secured with locating pins and fasteners. Next, the upper half of the outer shell is closed and secured with locating pins and fasteners, forming a complete sealing pressure-bearing module. Then, the wire anchoring module is fixedly installed onto the sealing pressure-bearing module using a connecting structure. Finally, the bending limiter is installed at the end of the outer shell, completing the assembly of the entire device.

[0031] The specific implementation of the submarine cable sheath repair and protection device of the present invention is as follows.

[0032] The device in this embodiment mainly includes a wire anchoring module, a sealing pressure-bearing module, and a bending limiter.

[0033] The wire anchoring module consists of a lower outer conical seat 2, an upper outer conical seat 3, a conical sleeve 4, an inner conical shaft 5, a top block 6, and a connecting plate 7. During assembly, the upper and lower outer conical seats are first joined together and tightened with screws. Then, the armored wire is straightened and evenly placed into the inner conical hole of the outer conical seat, avoiding overlap. Next, the conical sleeve 4 is placed on the inner conical shaft 5 and inserted into the outer conical seat. At this point, the screws on the connecting plate 7 are tightened, pushing the top block 6 to press against the inner conical shaft 5, causing axial displacement. Due to the conical surface action (the taper is preferably 10°), the conical sleeve 4 is forced to expand radially, tightly locking the wire in the inner conical hole of the outer conical seat. Based on the friction self-locking principle, this structure can maintain a locked state even after the pre-tightening force is removed. The clamping force F can be expressed by the formula:

[0034] Estimation and design are performed, where Fp is the effective load, α is the wedge angle, and φ is the friction angle.

[0035] The sealing and pressure-bearing module includes an upper outer cylinder 8, a lower outer cylinder 9, a first end cap 10, a second end cap 11, a first gasket 12, a sealing gasket 13, a second gasket 14, an upper inner cylinder 15, a lower inner cylinder 16, and sealing strips. During assembly, the lower inner cylinder 16 is first placed into the lower outer cylinder 9. Then, the first gasket 12, the sealing gasket 13, and the second gasket 14 are sequentially placed into the end sealing grooves. Next, four flat sealing strips are inserted into the holes of the sealing gasket 13 and placed into the flat sealing grooves of the lower inner cylinder 16. The upper inner cylinder 15 is then placed on top, precisely positioned using locating pins, and the upper and lower inner cylinders are tightened with screws. Finally, the upper outer cylinder 8 is placed on top of the lower outer cylinder 9, again secured with locating pins and tightened with screws, forming a robust double-layer sealing and pressure-bearing structure. The outer cylinder is made of annealed 316L stainless steel, and its tensile strength has been calculated to allow a tensile force of approximately 1850kN, providing a sufficient safety factor.

[0036] Finally, the assembled wire anchoring module is installed onto the sealed pressure-bearing module with screws, and the bending limiter 1 is installed at the end to complete the assembly of the entire device.

[0037] The entire device consists of four main parts: a wire anchoring module, a sealing and pressure-bearing module, a bending limiter, and a connecting structure. The wire anchoring module is used to directly anchor the armored steel wire 18 of the submarine cable 17. Its core components include an outer conical seat, an inner conical shaft 5, and a conical sleeve 4. The outer conical seat is an annular component with its inner hole machined into an inner conical hole, meaning the inner wall of the through hole is conical. The inner conical shaft is a cylindrical component with its outer portion machined into a conical surface, i.e., the first conical surface. The conical sleeve is an annular sleeve whose inner hole shape matches the first conical surface of the inner conical shaft, also being conical. Its outer surface is also machined into a conical surface, i.e., the second conical surface, which matches the taper of the inner conical hole of the outer conical seat.

[0038] In the actual assembly of the anchoring module, the outer conical seat is first fixed. Next, multiple armored steel wires, after the end treatment of the submarine cable, are evenly distributed and placed around the inner conical hole of the outer conical seat. Then, the conical sleeve 4 is pre-fitted onto the inner conical shaft 5, and the assembly of the inner conical shaft 5 and the conical sleeve 4 is then inserted axially into the inner conical hole of the outer conical seat. At this point, the armored steel wire is positioned between the outer second conical surface of the conical sleeve and the wall of the inner conical hole of the outer conical seat. By applying an axial force to drive the inner conical shaft 5 to move deeper into the hole, the wedging effect of the first conical surface forces the conical sleeve 4 to expand radially. This radial expansion of the conical sleeve directly causes its outer second conical surface to press the armored steel wire outwards, making it tightly adhere to and press into the wall of the inner conical hole of the outer conical seat, thereby achieving mechanical engagement and anchoring of the steel wire. To achieve stable self-locking, the taper of the first and second conical surfaces is designed to be ten degrees. This angle range can effectively utilize the principle of friction angle, so that after some of the installation pre-tightening force is removed, the structure tends to become tighter and tighter under external tension.

[0039] To provide the axial force for driving the inner conical shaft, the wire anchoring module further includes a top block 6 and a connecting plate 7. The connecting plate is bolted to the end of the outer conical seat. The top block is located between the connecting plate and the outer conical seat, and contacts the end of the inner conical shaft. When the drive screw on the connecting plate is tightened, the end of the screw pushes the top block, which in turn transmits force to the inner conical shaft, achieving precise axial displacement control. This structure facilitates operation using standard tools within the confined space of a ship's deck or offshore platform.

[0040] The sealing pressure-bearing module provides mechanical protection and a waterproof sealing environment for the repaired fiber optic connector. The module employs a layered, split design. The inner shell consists of an upper inner cylinder 15 and a lower inner cylinder 16 joined together, with sealing grooves machined on the split plane where they meet. The outer shell consists of an upper outer cylinder 8 and a lower outer cylinder 9 joined together, with its internal cavity slightly larger than the inner shell to accommodate the latter. During assembly, the lower inner cylinder 15 is first placed in a predetermined position within the inner cavity of the lower outer cylinder 16. The sealing system consists of end seals and planar seals. A first gasket 12, a sealing gasket 13 made of elastic material, and a second gasket 14 are sequentially installed in the sealing groove at the axial end of the cylinder, forming a multi-layered end seal. A long strip of planar sealing strip is installed in the sealing groove on the split surface of the inner shell. To enhance sealing reliability, holes are provided on the corresponding positions of the sides of the sealing gaskets. During installation, the end of the planar sealing strip is inserted into these holes, achieving spatial connection and mutual positioning between the planar seal and the end seal, forming a redundant sealing system. After placing the internal seals, cover the upper inner cylinder 15 with the locating pins, precisely align the upper and lower inner cylinders, and then tighten with bolts. Subsequently, cover the lower outer cylinder 9 with the upper outer cylinder 8, again using locating pins and bolts for positioning, ultimately forming a sealed pressure-bearing cavity with a double-shell structure. This cavity can effectively resist hydrostatic pressure and pressure fluctuations in the deep-sea environment.

[0041] The connection structure typically employs multiple high-strength screws to firmly connect the outer conical flange face of the assembled wire anchoring module to the outer shell end face of the sealing pressure-bearing module, integrating the two modules into a rigid whole to jointly bear the cable tension. The bending limiter consists of multiple hinged rigid limiting blocks, installed on the outer side of the outer shell end via surrounding bolts. Its internal channel diameter is designed to allow necessary bending of the optical cable while strictly limiting its minimum bending radius, preventing additional stress or damage to the joint due to excessive bending.

[0042] The assembly process of this device follows a modular and sequential principle. First, the wire anchoring module is assembled and pre-tightened on land or the deck of the work vessel. Next, all sealing elements are installed in the lower half of the sealed pressure-bearing module, and the upper inner shell is closed. Then, the upper half of the outer shell of the sealed pressure-bearing module is closed. Afterward, the two main modules are integrated using connecting screws. Finally, a bending limiter is installed at the end of the device. The entire process is clearly defined, and the separate design of each component greatly facilitates transportation and on-site hoisting, making it particularly suitable for rapid repair operations under harsh marine conditions. All major load-bearing components, such as the outer cylinder and outer cone, can be integrally forged or cast from seawater-resistant austenitic stainless steel and then machined to ensure the strength and corrosion resistance required for long-term service on the seabed.

[0043] This invention features: 1. A reliable wire locking device: It adopts a double-cone wedge self-locking structure and uses mechanical principles to achieve stable anchoring of the wire. Its clamping force increases with the increase of external tension, and it has good vibration and impact resistance. It can ensure that the connection strength after repair is not less than 70% of the optical cable breaking strength.

[0044] 2. Excellent sealing performance: The design of the half-type inner and outer cylinders combined with multi-layer and multi-seal features constitutes a redundant sealing system, which can effectively resist the high pressure of the deep sea and long-term corrosion, and ensure the dryness and safety of the internal optical cable joints.

[0045] 3. Convenient on-site operation: All major components adopt a split or modular design, which facilitates transportation and rapid on-site assembly and disassembly, greatly improving the efficiency and success rate of submarine cable repair operations.

[0046] 4. High structural strength: The outer shell is made of high-strength corrosion-resistant materials (such as 316L stainless steel) and has extremely high tensile strength through precise calculation and design. It has a high safety factor and can match the mechanical properties of the submarine cable.

[0047] Any embodiment of the present invention can be used as an independent technical solution or in combination with other embodiments. All patents and publications mentioned in this specification represent publicly available technologies that can be used with the present invention. All patents and publications cited herein are also listed in the references as if each publication were individually referenced. The present invention can be implemented in the absence of any one or more elements, or one or more limitations, which are not specifically stated herein. The terminology and expressions used herein are descriptive methods and are not intended to be limiting, nor is there any intention to exclude any equivalent features from the terms and interpretations described herein; however, it is understood that any suitable changes or modifications can be made within the scope of the invention and the claims. It is understood that the embodiments described herein are embodiments and features in some examples, and any modifications and variations can be made by those skilled in the art based on the spirit of the description, and such modifications and variations are also considered to fall within the scope of the invention and the limitations of the independent and appended claims.

Claims

1. A submarine cable sheath repair and protection device, characterized in that, include: Steel wire anchoring module, sealing pressure-bearing module, bending limiter and connection structure; The wire anchoring module includes an outer conical seat, an inner conical shaft, and a conical sleeve. The outer conical seat has an inner conical hole, the inner conical shaft is disposed in the inner conical hole, and the conical sleeve is sleeved outside the inner conical shaft. The mating surface between the inner conical shaft and the conical sleeve is a first conical surface, and the mating surface between the conical sleeve and the inner conical hole of the outer conical seat is a second conical surface. The sealing pressure-bearing module includes a split outer shell and a split inner shell, the inner shell being disposed inside the outer shell, together forming a sealed cavity for accommodating the cable connector; a sealing element is provided between the inner shell and the outer shell; The bending limiter is connected to the end of the outer housing; The connection structure securely connects the wire anchoring module to the sealing pressure-bearing module.

2. The submarine cable sheath repair and protection device according to claim 1, characterized in that, The taper of both the first and second conical surfaces is between 8° and 12°.

3. The submarine cable sheath repair and protection device according to claim 1 or 2, characterized in that, The wire anchoring module also includes a top block and a connecting plate; the connecting plate drives the top block through fasteners, causing the top block to push the inner cone shaft to generate axial displacement.

4. The submarine cable sheath repair and protection device according to claim 3, characterized in that, The connecting plate is equipped with screws. When the screws are tightened, they directly or indirectly push the top block, thereby driving the inner cone shaft to move axially.

5. The submarine cable sheath repair and protection device according to claim 1, characterized in that, The sealing element includes an end sealing assembly disposed on the end face of the cylinder and at least one planar sealing strip disposed on the split mating surface of the inner shell; the end sealing assembly includes multiple layers of gaskets and sealing pads stacked in sequence.

6. The submarine cable sheath repair and protection device according to claim 5, characterized in that, The flat sealing strip is embedded in the sealing groove of the inner housing, and the sealing gasket is provided with a positioning hole for the end of the flat sealing strip to be inserted.

7. The submarine cable sheath repair and protection device according to claim 1, characterized in that, The outer shell is composed of an upper outer cylinder and a lower outer cylinder, which are engaged with fasteners via positioning pins; the inner shell is composed of an upper inner cylinder and a lower inner cylinder, which are engaged with fasteners via positioning pins.

8. A method for repairing and protecting submarine cable sheaths, applied to the submarine cable sheath repair and protection device according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Distribute the armored steel wires of the submarine cable into the inner cone hole of the outer cone seat. By driving the inner cone shaft to move axially, the cone sleeve expands radially, thereby anchoring the steel wires between the outer cone seat and the cone sleeve. S2. Place the lower half of the inner housing on the lower half of the outer housing, install the sealing element, close the upper half of the inner housing and fix it. S3. Cover the lower half of the outer shell with the upper half and fix it to form a sealed pressure-bearing module; S4. The steel wire anchoring module that has been anchored is fixedly installed to the sealing pressure-bearing module through the connection structure; S5. Install the bending limiter at the end of the outer housing.

9. The method for repairing and protecting submarine cable sheaths according to claim 8, characterized in that, The step of driving the inner conical shaft to move axially is achieved by tightening the fasteners on the connecting plate, pushing the top block, and the top block pushes the inner conical shaft to generate displacement.

10. The method for repairing and protecting submarine cable sheaths according to claim 8, characterized in that, The steps for installing the sealing element include: sequentially installing multiple layers of gaskets and sealing gaskets on the end face of the cylinder to form an end seal; installing a flat sealing strip in the sealing groove of the split mating surface of the inner shell, and inserting the end of the flat sealing strip into the positioning hole of the sealing gasket.

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