A device and method for repairing a submarine cable center clamp that has fallen off

Abstract

The present invention discloses a device for repairing the detachment of a submarine cable center clamp, which is used for fixing a J-tube and a submarine cable, and includes a bell-mouth clamp, an adapter flange, a metal limiter, a bend limiter, and a telescopic transition joint; the bell-mouth clamp is used to hold and fix on the bell mouth of the J-tube, and two connecting grooves are relatively provided on the bell-mouth clamp, and the two connecting grooves cooperate to fix the adapter flange, and the adapter flange is also connected to a number of metal limiters and a number of bend limiters, and the bend limiter is fixed to the undamaged limiter group through a telescopic transition joint; based on the above-mentioned repair device, a repair method is also provided for convenient underwater operation. The present invention can perform efficient underwater repairs on damaged center clamps and bend limiters, strengthen the protection of submarine cables, increase the service life of submarine cables, reduce the difficulty of repair operations, simplify construction steps, and greatly reduce repair costs.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a device and method for repairing a fallen-off submarine cable center clamp. Background Art

[0002] The bend limiter and center clamp protect the cable's connection to the J-tube. They prevent excessive bending and abrasion of the cable caused by water impact and swaying, which can damage the cable's outer armored wire rope. The center clamp secures the cable to the J-tube's flare, reducing water impact and swaying, and keeping the cable away from the tube's inner wall, minimizing wear. The bend limiter, connected to the rear of the center clamp in a series configuration, effectively prevents excessive bending and damage to the cable caused by external forces.

[0003] In recent years, due to the harsh sea conditions and currents at some offshore wind farms, at least three common problems have occurred during submarine cable installation: 1. The center clamp is not properly pulled into place, resulting in the end of the center clamp not properly contacting the inner wall of the J-tube, and there is a margin of play between the center clamp and the inner wall of the J-tube. 2. Design and manufacturing defects: Although the center clamp can be installed, it cannot properly grip the submarine cable, causing the center clamp to detach from the J-tube's flare and thus lose its proper contact with the inner wall of the J-tube. 3. Due to unexpected sea conditions at the installation site, a large overhanging pit appears near the flare of the pile foundation J-tube. The force of the limiter hanging from the tail of the center clamp due to the swinging force of the water flow and the weight of the suspended part exceeds the rated pull-out force of the center clamp, causing the center clamp to be pulled away from the flare. All three of these conditions can cause the submarine cable to become suspended in the air, and the center clamp and bend limiter cannot effectively protect the submarine cable. When subjected to external forces, the submarine cable sways and bends, contacting and rubbing against the inner wall of the J-tube, causing damage.

[0004] When a problem occurs with the center clamp, the corresponding position needs to be repaired in time to ensure that the submarine cable is not damaged during use. After the existing center clamp falls off or is damaged, it cannot be dragged into the J-tube again, and there is no equipment to assist in tightening it during underwater operations. Therefore, the center clamp cannot be installed in place by manually pushing and locking it.

[0005] Therefore, there is an urgent need for a device and technology for conveniently repairing the central fixture after it falls off underwater. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a device and method for repairing the detachment of the center clamp of a submarine cable, which can perform efficient underwater operations to repair the damaged center clamp and bend limiter, strengthen the protection of the submarine cable, increase the service life of the submarine cable, reduce the difficulty of maintenance operations, simplify the construction steps, and greatly reduce the maintenance cost.

[0007] In order to solve the above technical problems, the present invention provides a submarine cable center clamp detachment repair device for fixing the J-tube and the submarine cable, comprising a bell-mouth clamp, an adapter flange, a metal limiter, a bend limiter and a telescopic transition joint;

[0008] The bell mouth fixture includes two oppositely arranged conical semicircular rings, which cooperate to form a conical circular tube. A load-bearing flange plate is provided on each conical semicircular ring. The conical circular tube and the load-bearing flange plate are clamped together and arranged on the bell mouth of the J-shaped tube. Two connecting grooves are provided on the load-bearing flange plate.

[0009] The adapter flange includes a circular tube body and a square flange plate and a first convex flange plate arranged at both ends of the circular tube body. The square flange plate is fixed with two connecting grooves. The first convex flange plate is connected to the metal limiter. The metal limiter is connected in series with the bending limiter and the telescopic transition joint in sequence. The telescopic transition joint is also connected to the undamaged limiter group on the submarine cable.

[0010] Furthermore, the bell-mouth fixture, adapter flange, metal limiter, bend limiter, and telescopic transition joint are all Hough structures.

[0011] Furthermore, two groups of first bolt ribs for locking and fixing are provided on the two conical semicircular rings, and a first hinge chain is provided between one group of first bolt ribs, and the first bolt ribs are fixedly connected to the conical semicircular rings and the corresponding load-bearing flange plates. A number of hanging ear ribs are also provided on the outer periphery of the bell-mouth clamp, and the hanging ear ribs are fixedly connected to the conical semicircular rings and the corresponding load-bearing flange plates.

[0012] Furthermore, a weight-reducing avoidance opening is provided on the load-bearing flange plate around the connecting groove.

[0013] Furthermore, the connecting groove is a rectangular frame, and the corresponding and adjacent sides of the two connecting grooves are set to openings. The connecting groove is provided with a number of waist-shaped holes on the two side walls along the axial direction of the cable, and the waist-shaped holes on the same side wall are located in a straight line. The method flange plate is provided with a locking hole, and the locking hole and the waist-shaped hole are fixed by a bolt assembly.

[0014] Furthermore, an elastic rubber pad is provided between the conical semicircular ring and the outer surface of the bell mouth, and polyurethane elastomer is provided on the inner wall of the adapter flange and the metal limiter.

[0015] Furthermore, the telescopic transition joint includes an adapter plate and a fixing sleeve, the adapter plate is clamped and fixed on the bending limiter located at the end, and the two ends of the fixing sleeve are clamped and fixed on the limiter group and the adapter plate respectively.

[0016] Furthermore, the fixing sleeve includes two oppositely arranged semicircular tube sheets, and two groups of second bolt ribs for locking and fixing are provided on the two semicircular tube sheets, and a second hinge chain is provided between one group of second bolt ribs.

[0017] Furthermore, both ends of the fixing sleeve are provided with axial limiting anti-slip plates, and the surface of the fixing sleeve is also provided with weight-reducing holes.

[0018] A maintenance method, using any one of the maintenance devices described above, comprises the following steps:

[0019] Remove the central clamp and the damaged original bend limiter on the submarine cable to form a maintenance area, and clean the marine biological attachments on the outer surface of the submarine cable and the outer surface of the J-tube flare in the maintenance area;

[0020] Divers set several lifting points on the submarine cable and the original undamaged bend limiter in the suspended section of the maintenance area, and lifted the submarine cable upwards so that the submarine cable in the maintenance area is away from the inner wall of the flare of the J-tube;

[0021] Install the adapter flange on the submarine cable, with the distance between the flange plate of the adapter flange and the end face of the flare being 3-8 cm;

[0022] Install the bell mouth fixture on the outer wall of the bell mouth end of the J-shaped tube, and clamp the square flange plate through the two connecting grooves and fix it with fasteners;

[0023] Install multiple metal limiters, which are fixed in series in sequence. The metal limiter at the head end is connected to the first convex flange plate of the adapter flange. Then install multiple bend limiters, which are connected to the metal limiter at the tail end until no bend limiters can be installed in the maintenance area.

[0024] Then, the marine biological attachments on the surface of the undamaged original bending limiter are cleaned, and the expansion joint is installed. The two ends of the expansion joint connect the bending limiter at the end and the undamaged original bending limiter;

[0025] Remove the lifting point and complete the repair.

[0026] Beneficial effects of the present invention:

[0027] By replacing the embedded center clamp with an external clamp structure for the trumpet clamp as the positioning basis, and cooperating with the adapter flange, the submarine cable can be fixed at a position away from the inner wall of the trumpet and suspended in the air, solving the problem of the center clamp not being able to be installed in place during underwater construction. The external socket method greatly reduces the difficulty of installation and also reduces the installation and maintenance costs.

[0028] Based on the structural characteristics of the maintenance device, the limiter near the bell mouth of the J-tube will bear the greatest bending moment force, so a metal bending limiter is installed. The strength of its metal structure is much greater than that of the bending limiter with a polyurethane structure, which improves the overall bending limiter's ability to withstand bending moments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the maintenance device after maintenance of the present invention;

[0030] Figure 2 This is a schematic structural diagram of the bell mouth fixture of the present invention from a first perspective;

[0031] Figure 3 This is a schematic structural diagram of the bell mouth fixture of the present invention from a second viewing angle;

[0032] Figure 4 It is a schematic diagram of the adapter flange structure of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the metal limiter of the present invention;

[0034] Figure 6 It is a schematic structural diagram of the telescopic transition joint of the present invention;

[0035] Figure 7 This is a schematic diagram of the lifting during maintenance of the present invention;

[0036] Figure 8 This is a schematic diagram of the assembly of the bell mouth fixture and the adapter flange of the present invention;

[0037] Figure 9 This is a schematic diagram of the assembly structure of the bell mouth fixture, adapter flange and metal limiter of the present invention;

[0038] Figure 10 It is a schematic diagram of the installation structure of the telescopic transition joint of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0040] Reference Figures 1 to 6As shown, an embodiment of the submarine cable center clamp detachment repair device of the present invention is used for fixing the J-tube 1 and the submarine cable 2, and includes a bell-mouth clamp 3, an adapter flange 4, a metal limiter 5, a bend limiter 6 and a telescopic transition joint 7; the bell-mouth clamp is fixed to the bell mouth of the J-tube, and the bell-mouth clamp, the adapter flange, the metal limiter, the bend limiter and the telescopic transition joint are connected in sequence, and finally connected to the original bend limiter on the head end of the undamaged limiter group 8 on the submarine cable through the telescopic transition joint, forming a series whole to protect the submarine cable. The bell-mouth clamp, the adapter flange, the metal limiter, the bend limiter and the telescopic transition joint are all half-type structures. And the connection type is flange type, which has the advantage that the bolt hole diameter is larger than that of ordinary fasteners, avoiding the situation that the bolt cannot be installed due to various abnormal conditions encountered during underwater construction, and the flange-type fastener increases the load-bearing area and improves the overall load-bearing strength.

[0041] Specifically, the bell-mouth clamp includes two relatively arranged conical semicircular rings 31, which cooperate to form a conical circular tube, and each conical semicircular ring is provided with a load-bearing flange plate 32. The conical circular tube and the load-bearing flange plate are clamped and arranged on the bell mouth of the J-shaped tube, and two connecting grooves 33 are relatively provided on the load-bearing flange plate; two groups of first bolt ribs 34 for locking and fixing are provided on the two conical semicircular rings, and a first hinge chain 35 is provided between one group of first bolt ribs. During underwater installation, the left and right halves can be freely opened and merged through the hinge chain. After merging, the upper and lower bolt holes can be fully aligned, which facilitates the installation of bolts during underwater construction, optimizes construction steps and reduces underwater operation time; the first bolt rib is fixedly connected to the conical semicircular ring and the corresponding load-bearing flange plate, and a number of lifting ear ribs 36 are also provided on the outer periphery of the bell-mouth clamp, which are fixedly connected to the conical semicircular ring and the corresponding load-bearing flange plate to improve strength and facilitate hanging construction. A weight-reducing avoidance opening 37 is provided on the load-bearing flange plate around the connecting groove. The weight-reducing avoidance opening can effectively reduce the overall weight of the bell-mouth clamp, and a position that can be inserted into the bell-mouth is reserved to facilitate construction workers to operate and lock.

[0042] The left and right conical semicircular rings of the bell-mouth clamp have a central notch and a certain width. After being locked by several sets of upper and lower bolts, the left and right halves shrink toward the center to completely clamp the bell mouth of the J-tube, and an elastic rubber pad (not shown in the figure) is placed between the outer surface of the bell mouth of the J-tube and the inner surface of the bell-mouth clamp to avoid rigid contact between the two parts and avoid the problem of inability to clamp due to the non-roundness or inaccurate size of the bell mouth or the bell-mouth clamp during the production and processing process.

[0043] The above-mentioned adapter flange includes a circular tube body 41 and a square flange plate 42 and a first convex flange plate 43 arranged at both ends of the circular tube body. The square flange plate is fixed with two connecting grooves, the first convex flange plate is connected to the metal limiter, the metal limiter is connected in series with the bending limiter and the telescopic transition joint in sequence, and the telescopic transition joint is also connected to the undamaged limiter group on the submarine cable.

[0044] The connecting groove is a rectangular frame, and the corresponding and adjacent sides of the two connecting grooves are both opened. The connecting groove is provided with a plurality of waist-shaped holes 332 on both side walls along the axial direction of the cable. The waist-shaped holes on the same side wall are located in a straight line. The square flange is provided with a locking hole, and the locking hole and the waist-shaped holes are fixed by a bolt assembly 333. The rectangular frame cooperates with the square flange to achieve a fixing and anti-rotation effect, which improves the connection effect. In addition, during the locking process, the locking holes on the square flange can effectively match the waist-shaped holes. Taking the position where the bell-mouth clamp is installed from top to bottom as an example, the waist-shaped holes are arranged in an up-down direction and their number is greater than the number of locking holes on the square flange. During the maintenance and construction of the submarine cable, the moving angle and distance range of the square flange can be effectively increased, ensuring that the hole position between the square flange plate and the connecting groove can still match and lock after the submarine cable is lifted at any position, simplifying the construction difficulty. The locking holes on the square flange can also be waist-shaped and arranged in a left-right direction, avoiding the situation where the bolts cannot be installed due to the incorrect hole position caused by the non-circular shape after the bell-mouth clamp is installed.

[0045] The metal limiter includes a second circular tube body 51, and a second concave flange 52 and a second convex flange 53 are respectively provided at both ends of the second circular tube body to ensure that it can be connected to the adapter flange. Specifically, the second concave flange cooperates with the first convex flange, and the two adjacent metal limiters are connected end to end. Reinforcing ribs are also provided on the surface of the second circular tube body to improve the strength, and a third bolt rib is also provided for connection and locking.

[0046] The telescopic transition joint includes an adapter plate 71 and a fixing sleeve 72. The adapter plate is clamped and fixed to the bend limiter at the end, and the two ends of the fixing sleeve are clamped and fixed to the limiter group and the adapter plate. The two parts of the telescopic transition joint are respectively adapted to the sizes of the bend limiters at both ends, avoiding the problem of bend limiters produced by different manufacturers being unable to be docked and installed. The two parts are then fixed to each other, resulting in a quick installation effect. The fixing sleeve includes two oppositely arranged semicircular tube segments 73, each of which is provided with two sets of second bolt ribs 74 for locking and fixing. A second hinge chain 75 is provided between one set of second bolt ribs. During underwater installation, the left and right halves can be freely opened and merged through the hinge chain. The upper and lower bolt holes after merging can be completely aligned, facilitating the installation of bolts during underwater construction, optimizing construction steps and reducing underwater operation time.

[0047] Both ends of the fixing sleeve are provided with axial limit anti-slip plates 76. The fixing sleeve can also be provided with axial limit anti-slip plates, wherein the two adjacent axial limit anti-slip plates are used to fix the ends of the original bending limiter. After installation, the telescopic transition joint is axially fixed in the installation position by the two axial limit anti-slip plates, and the remaining axial limit anti-slip plate is used to axially prevent the bending limiter installed during maintenance construction from slipping; the surface of the fixing sleeve is also provided with weight-reducing holes 77 to reduce the weight of the fixing sleeve.

[0048] The bending limiter that needs to be installed at the bell mouth position near the J-tube mentioned above is designed to withstand the maximum bending moment, so a metal limiter is installed here. The strength of its metal structure is much greater than that of the bending limiter with a polyurethane structure, which improves the overall limiter's ability to withstand bending moments. The adapter flange and the metal limiter body are both made of metal, and the inner wall is chemically bonded with a cast polyurethane elastomer to avoid direct contact between the metal and the submarine cable, effectively protecting the submarine cable from damage and reducing wear on the submarine cable.

[0049] The present invention provides a method for repairing a central clamp on a submarine cable using the repair device of the above structure. During repair, the central clamp and the original bend limiter on the submarine cable that is damaged or difficult to repair must first be removed to form a repair area. Marine biological attachments on the outer surface of the submarine cable and the outer surface of the J-tube flare in the repair area are then cleaned off, facilitating good adhesion between the component and the submarine cable and the J-tube flare during subsequent installation.

[0050] Then, divers set up several hanging points on the original bending limiter of the undamaged submarine cable and the suspended section in the maintenance area, referring to Figure 7 As shown, the submarine cable is lifted upward so that the submarine cable in the maintenance area is away from the inner wall of the trumpet mouth of the J-shaped tube, avoiding the inconvenience of manually lifting the submarine cable under the sea; specifically, a space of about 20 cm is required between the lower end face of the submarine cable and the lower inner wall of the trumpet mouth of the J-shaped tube.

[0051] The adapter flange is then installed on the submarine cable, with the distance between the square flange and the flared end face 3-8 cm, preferably 5 cm. Six sets of fasteners are provided, one above and one below, for fastening. The square flange at the rear is tightened with four hexagonal flange bolts, four hexagonal flange nuts, and four hexagonal locknuts. The first convex flange at the head is tightened with two hexagon socket head cap screws and one spring washer. Because the submarine cable is elevated, this adapter flange provides ample space for operation, making it quick and convenient.

[0052] Then install the bell mouth fixture on the outer wall of the bell mouth end of the J-shaped tube, and fix the flange plate limit clamp through the two connecting grooves and fix it with fasteners. Figure 8As shown; specifically, first open the bell-mouth clamp through the first hinge chain, insert the bell-mouth clamp vertically from top to bottom into the bell-mouth of the J-tube, and then flip and merge the two conical semicircular rings. At this time, it should be noted that the square flange plate at the tail of the adapter flange needs to be inserted into the two connecting grooves of the bell-mouth clamp; fasten it with the upper 4 groups of fasteners and the lower 3 groups of fasteners. The specifications of the fasteners here are all hexagonal flange bolts, hexagonal flange nuts, and hexagonal locknuts. After the bell-mouth clamp is fixed, fix the square flange plate of the adapter flange to the connecting groove. There are at least 6 groups of holes on both sides of the square flange plate, which match the waist-shaped holes on the connecting groove. 2 or more groups of fasteners can be inserted on one side, for a total of 4 or more groups of fasteners; the specifications of the fasteners are hexagonal flange bolts, hexagonal flange nuts, and hexagonal locknuts.

[0053] By cooperating and installing the adapter flange and the bell-mouth clamp, the relative position between the submarine cable and the bell-mouth of the J-tube can be fixed and prevented from displacement, and the outer wall of the submarine cable is away from the inner wall of the bell-mouth of the J-tube.

[0054] Then install multiple metal limiters, and the multiple metal limiters are fixed in series in sequence. The metal limiter at the head end is connected to the first convex flange plate of the adapter flange. Then install multiple bending limiters, and the bending limiter at the head end is connected to the metal limiter at the tail end until the bending limiter cannot be installed in the maintenance area. Refer to Figure 9 As shown in the figure, the method flange plate of the single-section metal limiter is tightened using two hexagonal flange bolts, two hexagonal flange nuts, and two hexagonal locknuts, while the first convex flange plate is tightened using two hexagon socket screws with a spring washer. Repeat the process until the required length is achieved. The bend limiter is a commonly used polyurethane component and can be identical or different in structure to the original, undamaged bend limiter, as long as it meets the requirements. The adapter plate in the transition expansion joint is connected to the newly installed bend limiter, one end of the fixing sleeve in the transition expansion joint is connected to the original, undamaged bend limiter, and the other end of the fixing sleeve is connected to the adapter plate to achieve the transition connection.

[0055] Specifically, clean the marine biological attachments on the surface of the original bend limiter. The original bend limiter is the one in the undamaged limiter group adjacent to the bend limiter installed during the maintenance process. After the cleaning is completed, the expansion joint needs to be installed. Figure 10As shown, the bend limiters at the ends of the expansion joint are connected to the undamaged original bend limiters. Specifically, the adapter plate in the expansion joint is inserted into the flange of the newly installed bend limiter and tightened using two hexagonal flange bolts, two hexagonal flange nuts, and two hexagonal locknuts. The fixing sleeve of the expansion joint is then opened via the second hinge chain and inserted into the tail of the original bend limiter at the top section. The fixing sleeve must completely cover the flange of the adapter plate and is tightened using six hexagonal flange bolts, six hexagonal flange nuts, and six hexagonal locknuts.

[0056] Finally, release the lifting point to complete the maintenance.

[0057] The above-mentioned telescopic transition joint is designed as a circular design. According to the shape design of the original bending limiter originally suspended on the submarine cable, the full-circle covering optimizes the possibility of damage to the bending limiter due to single-point force, and the telescopic range of movement is large. The adapter plate can be fixed at any position within the telescopic range of movement within the telescopic transition joint, which can adapt to the effective connection between the bending limiter and the original bending limiter at different spacing sizes; and the original bending limiter on the submarine cable that has not been damaged does not need to be disassembled and replaced, which greatly improves the economy of maintenance and construction.

[0058] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A submarine cable center clamp falling off repair device, used for fixing J-tube and submarine cable, characterized by: Includes bell mouth fixtures, adapter flanges, metal limiters, bend limiters and expansion joints; The bell mouth fixture includes two oppositely arranged conical semicircular rings, which cooperate to form a conical circular tube. A load-bearing flange plate is provided on each conical semicircular ring. The conical circular tube and the load-bearing flange plate are clamped together and arranged on the bell mouth of the J-shaped tube. Two connecting grooves are provided on the load-bearing flange plate. The adapter flange includes a circular tube body and a square flange plate and a first convex flange plate arranged at both ends of the circular tube body. The square flange plate is fixed with two connecting grooves. The first convex flange plate is connected to the metal limiter. The metal limiter is connected in series with the bending limiter and the telescopic transition joint in sequence. The telescopic transition joint is also connected to the undamaged limiter group on the submarine cable.

2. The submarine cable center clamp falling-off repair device according to claim 1, characterized in that: The bell mouth fixture, adapter flange, metal limiter, bending limiter and telescopic transition joint are all half-type structures.

3. The submarine cable center clamp falling-off repair device according to claim 2, characterized in that: Two groups of first bolt ribs for locking and fixing are provided on the two conical semicircular rings, and a first hinge chain is provided between one group of first bolt ribs. The first bolt ribs are fixedly connected to the conical semicircular rings and the corresponding load-bearing flange plates. A number of ear ribs are also provided on the outer periphery of the bell-mouth clamp, and the ear ribs are fixedly connected to the conical semicircular rings and the corresponding load-bearing flange plates.

4. The submarine cable center clamp falling-off repair device according to claim 3, characterized in that: A weight-reducing avoidance opening is provided on the load-bearing flange plate around the connecting groove.

5. The submarine cable center clamp falling-off repair device according to claim 3, characterized in that: The connecting groove is a rectangular frame, and the corresponding and adjacent sides of the two connecting grooves are set to openings. The connecting groove is provided with a plurality of waist-shaped holes on the two side walls along the axial direction of the cable. The waist-shaped holes on the same side wall are located in a straight line. The method flange plate is provided with a locking hole, and the locking hole and the waist-shaped hole are fixed by a bolt assembly.

6. The submarine cable center clamp falling-off repair device according to claim 1, characterized in that: An elastic rubber pad is provided between the conical semicircular ring and the outer surface of the bell mouth, and polyurethane elastomers are provided on the inner walls of the adapter flange and the metal limiter.

7. The submarine cable center clamp falling-off repair device according to claim 2, characterized in that: The telescopic transition joint includes an adapter plate and a fixing sleeve. The adapter plate is clamped and fixed on the bending limiter at the end. The two ends of the fixing sleeve are clamped and fixed on the limiter group and the adapter plate respectively.

8. The submarine cable center clamp falling-off repair device according to claim 7, characterized in that: The fixing sleeve includes two semicircular tube sheets arranged opposite to each other, and two groups of second bolt ribs for locking and fixing are arranged on the two semicircular tube sheets, and a second hinge chain is arranged between one group of second bolt ribs.

9. The submarine cable center clamp falling-off repair device according to claim 7, characterized in that: Both ends of the fixing sleeve are provided with axial limiting anti-slip plates, and the surface of the fixing sleeve is also provided with weight-reducing holes.

10. A maintenance method, characterized in that: The maintenance device according to any one of claims 1 to 9 comprises the following steps: Remove the central clamp and the damaged original bend limiter on the submarine cable to form a maintenance area, and clean the marine biological attachments on the outer surface of the submarine cable and the outer surface of the J-tube flare in the maintenance area; Divers set several lifting points on the submarine cable and the original undamaged bend limiter in the suspended section of the maintenance area, and lifted the submarine cable upwards so that the submarine cable in the maintenance area is away from the inner wall of the flare of the J-tube; Install the adapter flange on the submarine cable, with the distance between the flange plate of the adapter flange and the end face of the flare being 3-8 cm; Install the bell mouth fixture on the outer wall of the bell mouth end of the J-shaped tube, and clamp the square flange plate through the two connecting grooves and fix it with fasteners; Install multiple metal limiters, which are fixed in series in sequence. The metal limiter at the head end is connected to the first convex flange plate of the adapter flange. Then install multiple bend limiters, which are connected to the metal limiter at the tail end until no bend limiters can be installed in the maintenance area. Then, the marine biological attachments on the surface of the undamaged original bending limiter are cleaned, and the expansion joint is installed. The two ends of the expansion joint connect the bending limiter at the end and the undamaged original bending limiter; Remove the lifting point and complete the repair.

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