Submarine cable center clamp falling maintenance device and maintenance method

Abstract

The invention discloses a submarine cable center clamp falling maintenance device which is used for fixing a J-shaped pipe and a submarine cable and comprises a horn mouth clamp, an adapter flange, a metal limiter, a bending limiter and a telescopic transition joint. The horn mouth clamp is used for holding and fixing a horn mouth of the J-shaped pipe, two connecting grooves are oppositely formed in the horn mouth clamp, the two connecting grooves are matched to fix the adapter flange, the adapter flange is further connected with a plurality of metal limiters and a plurality of bending limiters, and the bending limiters are fixed with an undamaged limiter group through telescopic transition joints; based on the maintenance device, the invention further provides a maintenance method which is used for convenient underwater operation. According to the invention, efficient underwater operation maintenance can be carried out on the damaged center clamp and the bending limiter, the submarine cable protection is enhanced, the service life of the submarine cable is prolonged, the maintenance operation difficulty is reduced, the construction steps are simplified, and the maintenance cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a device and method for repairing a submarine cable central clamp falling off. Background Art

[0002] The bend limiter and center clamp are used to protect the connection between the submarine cable and the J-tube. Avoid excessive bending and wear of the submarine cable due to water flow impact and shaking, which will cause serious damage to the external armored steel wire rope of the submarine cable. The center clamp is used to fix the submarine cable at the bell mouth of the J-tube, which can reduce the impact and shaking of the water flow on the submarine cable, and keep the submarine cable away from the inner wall of the J-tube to reduce the wear of the submarine cable; the bend limiter is connected to the tail of the center clamp, which is a series structure, which can effectively prevent the submarine cable from being damaged due to excessive bending due to external force.

[0003] In recent years, due to the severe sea conditions and currents in some offshore wind farms, there are at least three problems that are prone to occur during the installation and construction of submarine cables: 1. The center clamp is not dragged into place, resulting in the end of the center clamp not being able to fit well with the inner wall of the J-tube, and there is a margin of activity between the center clamp and the inner wall of the J-tube; 2. Design and manufacturing defects. Although the center clamp can be installed, the center clamp cannot hold the submarine cable well, resulting in the center clamp being separated from the bell mouth of the J-tube, that is, it cannot fit well with the inner wall of the J-tube; 3. Due to the unexpected sea conditions at the site of use, a huge hanging pit appeared near the bell mouth of the pile foundation J-tube. The force of the limiter hanging at the tail of the center clamp swinging with the water flow and the weight of the suspended part exceeded the rated pull-off force designed by the center clamp, resulting in the center clamp being pulled away from the bell mouth. The above three working conditions will cause the submarine cable to be suspended in the air. The center clamp and the bending limiter cannot effectively protect the submarine cable. When subjected to external force, the submarine cable shakes and bends, and contacts and rubs 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 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 under the sea. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a submarine cable center clamp detachment repair device and repair method, which can perform efficient underwater operation repairs on damaged center clamps and bending limiters, strengthen the protection of submarine cables, increase the service life of submarine cables, reduce the difficulty of maintenance operations, simplify construction steps, and greatly reduce maintenance costs.

[0007] In order to solve the above technical problems, the present invention provides a submarine cable center clamp detachment repair device, which is used for fixing the J-tube and the submarine cable, and includes a bell-mouth clamp, a transfer flange, a metal limiter, a bending limiter and a telescopic transition joint;

[0008] The bell mouth fixture comprises two conical semicircular rings arranged opposite to each other, the two conical semicircular rings cooperate to form a conical circular tube, each conical semicircular ring is provided with a load-bearing flange plate, the conical circular tube and the load-bearing flange plate cooperate to clamp and be arranged on the bell mouth of the J-shaped tube, and the load-bearing flange plate is provided with two connecting grooves opposite to each other;

[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 a metal limiter, the metal limiter is connected in series with a bending limiter and a telescopic transition joint in sequence, and the telescopic transition joint is also connected to an 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, 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, and a plurality of ear ribs are also provided on the outer periphery of the bell-mouth clamp, the 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 plurality 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 arranged between the conical semicircular ring and the outer surface of the bell mouth, and polyurethane elastomers are arranged on the inner walls 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 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.

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

[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 bending limiter on the submarine cable to form a maintenance area, and remove 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 hanging points on the undamaged original bending limiter at the submarine cable and the suspended section in the maintenance area, and lift the submarine cable upward, so that the submarine cable in the maintenance area is away from the inner wall of the bell mouth of the J-tube;

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

[0022] The bell mouth fixture is installed on the outer wall of the bell mouth end of the J-shaped tube, and the flange plate limit clamp is set through two connecting grooves and fixed by fasteners;

[0023] Install multiple metal limiters, which are fixed in series in sequence, and the metal limiter at the head end is connected to the first convex flange plate of the adapter flange, and 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;

[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 with 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 built-in center clamp with a trumpet clamp of an external clamp structure 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 that the center clamp cannot be installed in place during underwater construction. The external sleeve connection 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 largest 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 It is a schematic structural diagram of the bell mouth clamp of the present invention from a first viewing angle;

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

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

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

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

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

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

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

[0038] Fig.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 is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but 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, including a bell-mouth clamp 3, a transfer flange 4, a metal limiter 5, a bend limiter 6 and a telescopic transition joint 7; the bell-mouth clamp is fixed on the bell mouth of the J-tube, and the bell-mouth clamp, the transfer 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 to form a series whole to protect the submarine cable. The bell-mouth clamp, the transfer flange, the metal limiter, the bend limiter and the telescopic transition joint are all half-type structures. And the connection type adopts the 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 situations encountered during underwater construction, and the flange-type fastener increases the force-bearing area and improves the overall force-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 a load-bearing flange plate 32 is arranged on each conical semicircular ring. 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 arranged relatively on the load-bearing flange plate; two groups of first bolt ribs 34 for locking and fixing are arranged on the two conical semicircular rings, and a first hinge chain 35 is arranged 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 is convenient for the installation of bolts during underwater construction, optimizes the construction steps and reduces the underwater operation time; the first bolt rib is fixedly connected to the conical semicircular ring and the corresponding load-bearing flange plate, and a plurality of lifting ear ribs 36 are also arranged on the outer periphery of the bell-mouth clamp, and the lifting ear ribs are fixedly connected to the conical semicircular ring and the corresponding load-bearing flange plate to improve the strength and facilitate the hanging construction. A weight-reducing avoidance opening 37 is provided on the load-bearing flange plate around the connecting groove, which can effectively reduce the overall weight of the bell-mouth clamp and reserve a position that can be inserted into the bell-mouth, so as to facilitate the construction personnel 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 set as openings. The connecting groove is provided with a plurality of waist-shaped holes 332 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 square flange plate is provided with a locking hole, and the locking hole and the waist-shaped hole are fixed by a bolt assembly 333. The rectangular frame cooperates with the square flange plate to have the effect of fixing and stopping rotation, and the connection effect is better. In the locking process, the locking hole on the square flange plate can effectively match the waist-shaped hole. Taking the position where the bell-mouth clamp is installed from top to bottom as an example, the waist-shaped holes are arranged in the up-down direction, and the number is greater than the number of locking holes on the square flange plate. During the maintenance and construction of the submarine cable, the moving angle and distance range of the square flange plate can be effectively increased to ensure that after the submarine cable is lifted at any position, the hole position between the square flange plate and the connecting groove can still match and lock, simplifying the construction difficulty. The locking hole on the square flange can also be a waist-shaped structure, and is in the left-right direction, avoiding the situation where the bolt cannot be installed due to the hole position error caused by the non-circular shape after the installation of the bell-mouth clamp.

[0045] The metal limiter includes a second circular tube body 51, and the two ends of the second circular tube body are respectively provided with a second concave flange 52 and a second convex flange 53 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 on the bending limiter at the end, and the two ends of the fixing sleeve are clamped and fixed on the limiter group and the adapter plate. The two parts of the telescopic transition joint are respectively adapted to the sizes of the bending limiters at both ends, avoiding the problem that the bending limiters produced by different manufacturers cannot be docked and installed. The two parts are then fixed to each other to form a quick installation effect. The fixing sleeve includes two relatively arranged semicircular tube segments 73, and two groups of second bolt ribs 74 for locking and fixing are arranged on the two semicircular tube segments. A second hinge chain 75 is arranged between one group of second bolt ribs. During the underwater installation process, the left and right halves can be freely opened and merged through the hinge chain, and the upper and lower bolt holes after merging can be completely aligned, which is convenient for the installation of bolts during underwater construction, optimizes the construction steps and reduces the underwater operation time.

[0047] Axial limit anti-dropout plates 76 are provided at both ends of the fixing sleeve. The fixing sleeve can also be provided with axial limit anti-dropout plates, wherein two adjacent axial limit anti-dropout plates are used to fix the ends of the original bending limiter. The installed telescopic transition joint is axially fixed in the installation position by the two axial limit anti-dropout plates, and the remaining axial limit anti-dropout plate is used to axially prevent the bending limiter installed during maintenance construction from dropping out. Weight reduction holes 77 are also provided on the surface of the fixing sleeve 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 required 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 ability of the overall limiter to withstand bending moments; the adapter flange and the main body of the metal limiter are both made of metal, and the cast polyurethane elastomer is chemically bonded to the inner wall 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 by using a repair device of the above structure. During repair, the central clamp on the submarine cable and the original bending limiter that is damaged or inconvenient to repair need to be removed first to form a repair area, and then the 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 cleaned, so that the components have a good fit with the submarine cable and the J-tube flare during subsequent installation.

[0050] Then, divers set up several suspension points on the original undamaged bending limiters of the 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] Then the adapter flange is installed on the submarine cable, wherein the distance between the flange plate of the adapter flange and the end face of the flare is 3-8cm, preferably 5cm, and it is fastened by 6 sets of fasteners provided at the top and bottom. The flange plate at the tail is tightened by 4 hexagonal flange bolts, 4 hexagonal flange nuts, and 4 hexagonal anti-loosening nuts, and the first convex flange plate at the head is tightened by 2 hexagon socket screws with 1 spring washer. Since the submarine cable is lifted, this adapter flange has operating space, which is convenient and quick.

[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 through 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 anti-loosening nuts. 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 cooperate with the waist-shaped holes on the connecting groove. ≥2 groups of fasteners can be inserted on one side, and a total of ≥4 groups of fasteners; the specifications of the fasteners are hexagonal flange bolts, hexagonal flange nuts and hexagonal anti-loosening nuts.

[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 without 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. Fig. 9 As shown; the method flange plate of the single-section metal limiter is tightened by 2 hexagonal flange bolts, 2 hexagonal flange nuts, and 2 hexagonal anti-loosening nuts, and the first convex flange plate is tightened by 2 hexagonal screws with 1 spring washer; repeat the operation until the required length is connected in series. The bend limiter is a commonly used polyurethane material component, which can be consistent or inconsistent with the structure of the undamaged original bend limiter as long as it meets the use requirements. The adapter plate in the transition expansion joint is matched and connected with the newly installed bend limiter, one end of the fixed sleeve in the transition expansion joint is matched and connected with the undamaged original bend limiter, and finally the other end of the fixed sleeve is matched and connected with the adapter plate to achieve the effect of transition connection.

[0055] Specifically, clean the marine biological attachments on the surface of the original bend limiter, which is the one in the undamaged limiter group adjacent to the bend limiter installed during the maintenance process; after the cleaning, the expansion joint needs to be installed, refer to Fig.10As shown, the two ends of the expansion joint connect the bending limiter at the end with the undamaged original bending limiter; specifically, the adapter plate in the transition expansion joint is inserted into the flange of the newly installed bending limiter, and tightened with 2 hexagonal flange bolts, 2 hexagonal flange nuts, and 2 hexagonal anti-loosening nuts. Then, the fixing sleeve of the transition expansion joint is opened through the second hinge chain and inserted into the tail of the original bending limiter at the top section. The fixing sleeve needs to completely cover the flange of the adapter plate, and tightened with 6 hexagonal flange bolts, 6 hexagonal flange nuts, and 6 hexagonal anti-loosening nuts.

[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 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 activity is large. The adapter plate can be fixed at any position within the telescopic range of activity in the telescopic transition joint, which can adapt to the effective connection at different spacing sizes between the bending limiter and the original bending limiter; 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 change made by a person 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 detachment repair device, used for fixing J-tube and submarine cable, characterized in that: Includes bellmouth fixtures, adapter flanges, metal limiters, bend limiters and telescopic transition joints; The bell mouth fixture comprises two conical semicircular rings arranged opposite to each other, the two conical semicircular rings cooperate to form a conical circular tube, each conical semicircular ring is provided with a load-bearing flange plate, the conical circular tube and the load-bearing flange plate cooperate to clamp and be arranged on the bell mouth of the J-shaped tube, and the load-bearing flange plate is provided with two connecting grooves opposite to each other; 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 a metal limiter, the metal limiter is connected in series with a bending limiter and a telescopic transition joint in sequence, and the telescopic transition joint is also connected to an 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 Hough-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 arranged on the two conical semicircular rings, and a first hinge chain is arranged 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 plurality of ear ribs are also arranged 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 is 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 two side walls of the connecting groove along the axial direction of the cable are provided with a plurality of waist-shaped holes, 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.

6. The submarine cable center clamp falling-off repair device according to claim 1, characterized in that: An elastic rubber pad is arranged between the conical semicircular ring and the outer surface of the bell mouth, and polyurethane elastomers are arranged 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 comprises an adapter plate and a fixing sleeve. The adapter plate is clamped and fixed on a bending limiter at the end. 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 comprises two semicircular tube sheets arranged opposite to each other, 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: Axial limiting anti-dropping plates are arranged at both ends of the fixing sleeve, and weight-reducing holes are also arranged on the surface of the fixing sleeve.

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 bending limiter on the submarine cable to form a maintenance area, and remove 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 hanging points on the undamaged original bending limiter at the submarine cable and the suspended section in the maintenance area, and lift the submarine cable upward, so that the submarine cable in the maintenance area is away from the inner wall of the bell mouth of the J-tube; Install the adapter flange on the submarine cable, where the distance between the flange plate of the adapter flange and the end face of the flare is 3-8 cm; The bell mouth fixture is installed on the outer wall of the bell mouth end of the J-shaped tube, and the flange plate limit clamp is set through two connecting grooves and fixed by fasteners; Install multiple metal limiters, which are fixed in series in sequence, and the metal limiter at the head end is connected to the first convex flange plate of the adapter flange, and 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; 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 with the undamaged original bending limiter; Remove the lifting point and complete the repair.

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