Submarine cable traction resistance reduction structure

Abstract

The invention relates to a submarine cable traction resistance reduction structure, which comprises a traction module, a plurality of resistance reduction modules and a plurality of tension steel cables, and is characterized in that the traction module fixedly sleeves the end part of a submarine cable and is connected with an armor wire of the submarine cable; the resistance reduction modules are fixedly arranged on the submarine cable in a sleeving mode so as to reduce friction resistance when the submarine cable is pulled. And each tensioning steel cable penetrates through the resistance reducing modules and is connected with the traction module. According to the structure, the armoring wires are used as stress pieces for bearing part of traction load; and meanwhile, a plurality of tensioning steel cables are matched with the resistance reducing modules fixedly sleeved along the submarine cable to bear the rest traction load. Through multi-point stress of the armoring wires, the tensioning steel cables and the resistance reducing modules, when the submarine cable is pulled through the traction module, the stress concentration phenomenon at the connecting positions of the ends of the submarine cable and the pressure load borne by all the resistance reducing modules are reduced, and therefore the stability and stress resistance of the traction resistance reducing structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable laying, and particularly to a drag reduction structure for submarine cable traction. Background Art

[0002] In an offshore wind power grid-connected transmission system, submarine cables collect the electric energy generated by offshore wind turbine groups to an offshore booster station. After the electric energy is boosted, it is transmitted over a long distance through submarine cables. When a submarine cable needs to complete the land-sea connection and transmit the electric power to land facilities, the prior art generally adopts a non-excavation type dike-piercing landing process, that is, high-strength steel pipes are pre-buried along the planned path as cable protection sleeves. The protection sleeves penetrate into the seabed from the mud entry point in the open sea, pass through sensitive areas such as the seabed under the dike through the ground, and are unearthed and butt-jointed in the onshore switch station. During the construction process, the submarine cable needs to be traction-passed through the protection sleeve to form a complete power transmission channel.

[0003] However, the following technical bottlenecks are exposed in the actual application of this process: First, during the cable traction process, the outer sheath of the cable is in continuous contact and friction with the inner wall of the protection sleeve. Especially in the section where the diameter of the protection sleeve changes and the bending transition section, the friction coefficient between the cable and the protection sleeve is extremely high, which is likely to cause wear of the outer sheath of the submarine cable and even internal damage to the cable, forming a potential risk of partial discharge. Second, the traditional cable traction system uses a single-point tension application method at the end to traction the cable, and the stress concentration phenomenon at the connection between the traction rope and the cable end is significant, which is likely to cause the cable end to break.

[0004] Most of the existing improvement schemes use an external pulley group for the cable to reduce the frictional resistance between the cable and the protection sleeve. However, its structure makes the cable gravity and pressure load concentrate on the pulley group, making the pulley group prone to bearing jamming or even wheel body fracture. Moreover, the support points of the pulley group make the cable present a catenary state, aggravating the traction load stress concentration phenomenon between the traction rope and the cable end, and making the cable end more likely to break. Summary of the Invention

[0005] The present invention aims to provide a drag reduction structure for submarine cable traction, which can avoid the problems of pulley group jamming and fracture and submarine cable end fracture while reducing the frictional resistance generated during the submarine cable traction process.

[0006] To achieve the above object, the present invention provides a drag reduction structure for submarine cable traction, which is applicable to submarine cables and includes a traction module, a plurality of drag reduction modules, and a plurality of tension steel cables, wherein: the traction module is fixedly sleeved on the end of the submarine cable and is connected to the armor wires of the submarine cable; a plurality of the drag reduction modules are respectively fixedly sleeved on the submarine cable to reduce the frictional resistance when traction the submarine cable; each tension steel cable penetrates through a plurality of the drag reduction modules and is connected to the traction module.

[0007] In the above submarine cable traction and resistance reduction structure, the traction module is connected to the armor wire of the submarine cable, making the armor wire the stress-bearing member that bears part of the traction load. At the same time, through several tension steel cables cooperating with each resistance reduction module sleeved along the submarine cable, the remaining part of the traction load is borne. Through the multi-point force-bearing of the armor wire, tension steel cables and resistance reduction modules, when the submarine cable is tractioned by the traction module, the stress concentration phenomenon at the end connection of the submarine cable and the pressure load borne by each resistance reduction module are reduced, thereby improving the stability and stress resistance of the traction and resistance reduction structure, avoiding the fracture of the cable end during the process of tractioning the submarine cable and the damage of the resistance reduction module, and enhancing the protection effect on the submarine cable.

[0008] Preferably, the resistance reduction module includes a circular ring frame and several resistance reduction balls, where: the circular ring frame is sleeved on the submarine cable; several sliding grooves are provided on the outer wall of the circular ring frame; each resistance reduction ball is slidably embedded into the corresponding sliding groove, so that several resistance reduction balls are slidably embedded into several sliding grooves to reduce the frictional resistance when tractioning the submarine cable; each tension steel cable passes through several circular ring frames and is then connected to the traction module.

[0009] In this embodiment, the resistance reduction balls of each resistance reduction module cooperate to prevent the submarine cable from directly contacting the protective sleeve. Under the traction force of the traction module, the resistance reduction balls drive the submarine cable forward in a rolling manner, reducing the frictional resistance when tractioning the submarine cable and enhancing the protection effect on the surface protective layer of the submarine cable.

[0010] Preferably, the resistance reduction module further includes a tightening and anti-slip layer, and the tightening and anti-slip layer is arranged on the inner wall of the circular ring frame, where: the tightening and anti-slip layer makes the circular ring frame sleeved on the submarine cable to prevent displacement between the circular ring frame and the submarine cable.

[0011] In this embodiment, the tightening and anti-slip layer has a certain deformation ability. When the circular ring frame is sleeved on the submarine cable through the tightening and anti-slip layer, the thickness of the tightening and anti-slip layer is slightly larger than the distance between the circular ring frame and the submarine cable to improve the tightness between the circular ring frame and the submarine cable, ensure that the circular ring frame is tightly sleeved on the submarine cable, and avoid displacement between the circular ring frame and the submarine cable when tractioning the submarine cable.

[0012] Preferably, the tightening and anti-slip layer is provided with a limiting groove, and the circular ring frame is provided with a limiting convex part, where: the limiting groove and the limiting convex part cooperate to fix the tightening and anti-slip layer to the circular ring frame.

[0013] It should be noted that during the process of the overall traction of the circular ring frame and the submarine cable along the protection sleeve and moving forward, the traction force is dispersed to the tension steel cables connected to the circular ring frame and transmitted along the tension steel cables. There is an obvious relative displacement between the circular ring frame, the tightening anti-slip layer and the submarine cable. Based on this, in this embodiment, through the cooperation of the limiting groove and the limiting convex part, the tightening anti-slip layer is fixed to the circular ring frame, which can enhance the tightness between the circular ring frame and the tightening anti-slip layer and avoid relative displacement between the circular ring frame, the tightening anti-slip layer and the submarine cable.

[0014] Preferably, the circular ring frame further includes a plurality of anti-jamming guiding units, where: a plurality of the anti-jamming guiding units are respectively arranged on the side wall of the circular ring frame and are distributed in a circumferential manner along the side wall of the circular ring frame; a plurality of the anti-jamming guiding units are used to prevent the circular ring frame from tilting and jamming.

[0015] It should be noted that during the process of the overall traction of the circular ring frame and the submarine cable along the protection sleeve and moving forward, affected by the traction force in the front, the circular ring frame is prone to tilt relative to the submarine cable, so as to contact and jam with the upper and lower inner surfaces of the protection sleeve. Based on this, in this embodiment, a plurality of anti-jamming guiding units are provided. When the circular ring frame has a tendency of tilting displacement, the anti-jamming guiding units will contact and receive force with the protection sleeve to reset the circular ring frame and avoid the circular ring frame from jamming.

[0016] Preferably, the anti-jamming guiding unit includes a first fixing frame and a second fixing frame. The first fixing frame is embedded with a first guiding ball, and the second fixing frame is embedded with a second guiding ball, where: the first fixing frame and the second fixing frame are symmetrically arranged on the two side walls of the circular ring frame respectively.

[0017] In this embodiment, when the circular ring frame has a tendency of tilting displacement, the guiding ball will contact the protection sleeve along the tilting direction and roll under the action of the traction force to reset the circular ring frame, so as to avoid the circular ring frame from contacting and jamming with the upper and lower inner surfaces of the protection sleeve.

[0018] Preferably, a plurality of resistance-reducing grooves are arranged on the outer wall of the circular ring frame, where: a plurality of the resistance-reducing grooves are used to reduce the resistance borne by the circular ring frame when towing the submarine cable.

[0019] It should be noted that there are impurities such as sand and water in the protection sleeve buried in the ground, which increases the resistance borne by the circular ring frame when towing the submarine cable. Based on this, in this embodiment, a plurality of resistance-reducing grooves are arranged on the outer wall of the circular ring frame for sand, water and other impurities to pass through, so as to reduce the contact area between the circular ring frame and the impurities, and further reduce the resistance borne by the circular ring frame.

[0020] Preferably, a locking unit is provided on one side of any of the drag reduction grooves. Among them, any of the tension steel cables passes through the drag reduction groove and the locking unit, and thus passes through the corresponding ring frame. The locking unit is used to lock the corresponding tension steel cable.

[0021] In this embodiment, the tension steel cable passes through the corresponding drag reduction groove and the corresponding locking unit, and thus passes through the corresponding ring frame. The drag reduction groove is also used to limit the tension steel cable. The corresponding tension steel cable is locked by the locking unit, so that each drag reduction module is tightly connected to the tension steel cable, which is beneficial for the tension steel cable and each drag reduction module to cooperate to share the traction load and the pressure load borne by each drag reduction module, avoiding the breakage of the cable end and the damage of the drag reduction module during the process of towing the submarine cable, and enhancing the protection effect on the submarine cable.

[0022] Preferably, the traction module includes a sleeve sub-module, a traction sub-module and a clamping sub-module. The sleeve sub-module is connected to the traction sub-module. The sleeve sub-module is fixedly sleeved on the end of the submarine cable. Among them, the sleeve sub-module is used to connect the tension steel cable and includes a strip hole. After the armor wire of the submarine cable passes through the strip hole, it is clamped on the outer side of the sleeve sub-module through the cooperation of the sleeve sub-module and the clamping sub-module. The traction sub-module is used to connect the external traction device.

[0023] In this embodiment, the clamping sub-module is installed on the outer side of the sleeve sub-module and cooperates with the sleeve sub-module to clamp the armor wire of the submarine cable on the outer side of the sleeve sub-module, improving the firmness of the connection between the traction module and the armor wire of the submarine cable, and further enhancing the component force effect of the armor wire on the front-end traction force of the submarine cable, and further reducing the stress concentration phenomenon at the connection of the submarine cable end.

[0024] Preferably, the traction module includes a force-sharing disc, a traction disc and a fixed sleeve ring. The traction disc and the fixed sleeve ring are respectively connected to the force-sharing disc. The force-sharing disc is provided with a plurality of through holes. Among them, the fixed sleeve ring is fixedly sleeved on the end of the submarine cable. After the armor wires of the submarine cable are stranded into several groups of armored cables, each group of armored cables passes through the corresponding through hole and is fixedly connected to the force-sharing disc, so that several groups of armored cables are fixedly connected to the force-sharing disc. The traction disc is used to connect the tension steel cable and the external traction device.

[0025] In this embodiment, after the adjacent armored wires are divided into multiple groups and stranded into several groups of armored cables, each group of the armored cables passes through the corresponding perforation and is fixedly connected to the component force disc, so as to evenly distribute the traction force on each armored cable, thereby reducing the stress concentration phenomenon at the connection of the end of the submarine cable and enhancing the protection effect on the submarine cable. In addition, the fixing sleeve ring is tightly sleeved on the end of the submarine cable, which can make each group of armored cables evenly stressed and jointly share the traction force. At the same time, the stranded armored cable is tougher and stronger than a single armored wire, enhancing the stability of the traction and resistance reduction structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic view of the end of a submarine cable traction and resistance reduction structure provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic view of a submarine cable traction and resistance reduction structure provided by an embodiment of the present invention placed in a protective sleeve;

[0028] Figure 3 is a schematic cross-sectional view of a submarine cable provided by an embodiment of the present invention;

[0029] Figure 4 is a schematic view of a resistance reduction module structure provided by an embodiment of the present invention;

[0030] Figure 5 is a schematic view of another resistance reduction module structure provided by an embodiment of the present invention;

[0031] Figure 6 is a schematic view of yet another resistance reduction module structure provided by an embodiment of the present invention;

[0032] Figure 7 is a schematic view of a structure of a traction module provided by an embodiment of the present invention;

[0033] Figure 8 is a side view of a traction module provided by an embodiment of the present invention;

[0034] Figure 9 is a schematic view of another structure of a traction module provided by an embodiment of the present invention;

[0035] Wherein: 1. Resistance reduction module; 2. Traction module; 3. Tension steel cable; 4. Submarine cable; 5. Protection sleeve; 6. Armor wire; 7. Resistance reduction ball; 8. Ring frame; 9. Tightening anti-slip layer; 10. Anti-jamming guiding unit; 11a. First fixing frame; 11b. Second fixing frame; 12a. First guiding ball; 12b. Second guiding ball; 13. Resistance reduction groove; 14. Bottom groove; 15. U-shaped frame; 16. Upper half groove; 17. Lower half groove; 18. Limit convex part; 19. Limit groove; 20. Sleeve sub-module; 21. Traction sub-module; 22. Clamping sub-module; 23. Transition sub-module; 24. Strip hole; 25. Force dividing disc; 26. Traction disc; 27. Perforation; 28. Fixed sleeve ring; A1. Water-blocking conductor; A2. Conductor shield; A3. XLPE insulation; A4. Insulation shield; A5. Semiconductor water-blocking tape; A6. Alloy lead sheath; A7. Polyethylene (PE) sheath; A8. Filler strip; A9. Optical unit; A10. Tape; A11. Inner cushion layer; A12. Armor layer; A13. Outer covering layer. Detailed implementation manners

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects, rather than to describe a specific order.

[0037] In the offshore wind power grid-connected transmission system, the submarine cable collects the electric energy generated by the offshore wind turbine groups to the offshore booster station, and after the electric energy is boosted, it is transmitted over a long distance through the submarine cable. Refer to Figure 3 , Figure 3 is a schematic cross-sectional view of the submarine cable. The submarine cable includes a water-blocking conductor A1, a conductor shield A2, an XLPE insulation A3, an insulation shield A4, a semiconductor water-blocking tape A5, an alloy lead sheath A6, a polyethylene (PE) sheath A7, a filler strip A8, an optical unit A9, a tape A10, an inner cushion layer A11, an armor layer A12, and an outer covering layer A13; wherein, armor wires 6 are arranged inside the armor layer A12. Specifically, in some embodiments, the armor wires 6 are galvanized copper wires.

[0038] When submarine cables need to complete the sea-land connection and transmit electricity to land facilities, the existing technology generally adopts the trenchless penetrating landing process, that is, pre-buried high-strength steel pipes along the planned path as cable protection sleeves, which penetrate the seabed from the mud entry point in the open sea, pass through sensitive areas such as seawalls underground, and complete the unearthed connection from the onshore switch station. During the construction process, the submarine cable needs to be pulled and laid in the protection sleeve to form a complete power transmission channel.

[0039] However, the process has exposed the following technical bottlenecks in actual application: First, during the cable traction process, the cable outer layer and the inner wall of the protective casing are in continuous contact and friction, especially in the diameter change section and the bending transition section of the protective casing. The friction coefficient between the cable and the protective casing is extremely high, which can easily cause wear of the submarine cable outer layer and even damage to the cable interior, forming a hidden danger of partial discharge. Secondly, the traditional cable traction system uses a single-point tension application method at the end to traction the cable. The stress concentration phenomenon at the connection between the traction rope and the cable end is significant, which can easily cause the cable end to break.

[0040] Existing improvement schemes mostly use cable external pulley blocks to reduce the friction resistance between the cable and the protective sleeve, but its structure causes the cable gravity and pressure load to be concentrated on the pulley block, making the pulley block prone to bearing jamming or even wheel breakage. The pulley block support point makes the cable in a catenary state, aggravating the traction load stress concentration phenomenon between the traction rope and the cable end, making it more likely for the cable end to break.

[0041] In order to solve the above technical problems, see Figure 1 and Figure 2 The embodiment of the present invention provides a submarine cable traction resistance reduction structure, which is applicable to a submarine cable 4. The submarine cable 4 traction resistance reduction structure includes a plurality of resistance reduction modules 1, a traction module 2 and a plurality of tensioning cables 3, wherein: the traction module 2 is fixedly sleeved on the end of the submarine cable 4 and connected to the armor wire 6 of the submarine cable 4; a plurality of the resistance reduction modules 1 are respectively fixedly sleeved on the submarine cable 4 to separate the submarine cable 4 from the protective sleeve 5 to reduce the friction resistance when traction of the submarine cable 4; each of the tensioning cables 3 is passed through a plurality of the resistance reduction modules 1 and connected to the traction module 2.

[0042] Specifically, a plurality of the drag reduction modules are distributed along the length direction of the submarine cable 4 , and a plurality of the tensioning steel cables 3 are evenly distributed on the periphery of the submarine cable 4 .

[0043] In the above-mentioned undersea cable traction and resistance reduction structure, the traction module 2 is connected to the armor wire 6 of the undersea cable 4, so that the armor wire 6 serves as a load-bearing member for bearing part of the traction load. At the same time, through a number of tension steel cables 3 cooperating with each resistance reduction module 1 fixedly sleeved along the undersea cable 4, the remaining part of the traction load is borne. Through the multi-point force application of the armor wire 6, the tension steel cable 3 and the resistance reduction module 1, when the undersea cable 4 is tractioned through the traction module 2, the stress concentration phenomenon at the end connection of the undersea cable 4 and the pressure load borne by each resistance reduction module 1 are reduced, thereby improving the stability and stress resistance of the traction and resistance reduction structure, avoiding the fracture at the end of the cable during the process of tractioning the undersea cable 4 and the damage of the resistance reduction module 1, and enhancing the protection effect on the undersea cable 4.

[0044] In a preferred embodiment, referring to Figure 4 , the resistance reduction module 1 includes a number of resistance reduction balls 7 and a circular ring frame 8, wherein: the circular ring frame 8 is fixedly sleeved on the undersea cable 4; a number of sliding grooves are provided on the outer wall of the circular ring frame 8; each resistance reduction ball 7 is slidably embedded into the corresponding sliding groove, so that a number of resistance reduction balls 7 are slidably embedded into a number of sliding grooves to reduce the frictional resistance when tractioning the undersea cable 4; each tension steel cable 3 passes through a number of circular ring frames 8 and is connected to the traction module 2.

[0045] Specifically, the inner diameter of the circular ring frame 8 is slightly larger than the diameter of the undersea cable 4; a number of sliding grooves are circumferentially distributed along the outer wall of the circular ring frame 8, and each resistance reduction ball 7 is slidably embedded into the corresponding sliding groove, so as to realize the circumferential distribution of a number of resistance reduction balls 7 along the circular ring frame 8. And part of the resistance reduction ball 7 protrudes outside the circumferential side surface of the circular ring frame 8 to roll in contact with the protective sleeve 5 during the process of tractioning the undersea cable 4.

[0046] In this embodiment, the resistance reduction balls 7 of each resistance reduction module 1 cooperate to prevent the direct contact between the undersea cable 4 and the protective sleeve 5, and under the traction force of the traction module 2, the resistance reduction balls 7 drive the submarine cable to move forward by rolling, while reducing the frictional resistance when tractioning the undersea cable 4, and enhancing the protection effect on the surface protective layer of the undersea cable 4.

[0047] In a preferred embodiment, referring to Figure 5 , the resistance reduction module 1 further includes a tightening anti-slip layer 9, and the tightening anti-slip layer 9 is arranged on the inner wall of the circular ring frame 8, wherein: the tightening anti-slip layer 9 fixes the circular ring frame 8 on the undersea cable 4 to prevent displacement between the circular ring frame 8 and the undersea cable 4.

[0048] In this embodiment, the tightening anti-slip layer 9 has a certain deformation ability. When the circular ring frame 8 is fixedly sleeved on the submarine cable 4 through the tightening anti-slip layer 9, the thickness of the tightening anti-slip layer 9 is slightly greater than the distance between the circular ring frame 8 and the submarine cable 4 when they are concentrically arranged, so as to improve the tightness between the circular ring frame 8 and the submarine cable 4, ensure that the circular ring frame 8 is tightly sleeved on the submarine cable 4, and prevent the circular ring frame 8 from shifting relative to the submarine cable 4 when the submarine cable 4 is towed.

[0049] In a preferred embodiment, refer to Figure 4 and Figure 5 , the circular ring frame 8 is provided with a limiting convex portion 18, and the tightening anti-slip layer 9 is provided with a limiting groove 19, wherein: the limiting groove 19 and the limiting convex portion 18 cooperate to fix the tightening anti-slip layer 9 to the circular ring frame 8.

[0050] Specifically, the limiting convex portion 18 is arranged at the inner edge of the circular ring frame 8, and the limiting convex portion 18 protrudes toward both sides of the circular ring frame 8 to limit the displacement of the tightening anti-slip layer 9; the limiting groove 19 is concave, which also limits the displacement of the tightening anti-slip layer 9.

[0051] It should be noted that during the process of the circular ring frame 8 and the submarine cable 4 being towed as a whole and moving forward along the protective sleeve 5, the traction force is dispersed to the tension steel cable 3 connected to the circular ring frame 8 and transmitted along the tension steel cable 3. Obvious relative displacement is likely to occur between the circular ring frame 8, the tightening anti-slip layer 9 and the submarine cable 4. Based on this, in this embodiment, by the cooperation of the limiting groove 19 and the limiting convex portion 18, the tightening anti-slip layer 9 is fixed to the circular ring frame 8, which can enhance the tightness between the circular ring frame 8 and the tightening anti-slip layer 9 and prevent relative displacement between the circular ring frame 8, the tightening anti-slip layer 9 and the submarine cable 4.

[0052] In a preferred embodiment, refer to Figure 4 , the circular ring frame 8 further includes a plurality of anti-jamming guiding units 10, wherein: the plurality of anti-jamming guiding units 10 are respectively arranged on the side wall of the circular ring frame 8 and are circumferentially distributed along the side wall of the circular ring frame 8; the plurality of anti-jamming guiding units 10 are used to prevent the circular ring frame 8 from tilting and jamming.

[0053] Specifically, the anti-jamming guiding units 10 are circumferentially distributed along the circular ring frame.

[0054] It should be noted that during the process of the overall traction of the circular ring frame 8 and the submarine cable 4 along the protection sleeve 5 forward, due to the influence of the forward traction force on the circular ring frame 8, the circular ring frame 8 is prone to tilt relative to the submarine cable 4, and thus gets stuck by contacting the upper and lower inner surfaces of the protection sleeve 5. Based on this, in this embodiment, a plurality of anti jamming guiding units 10 are provided. When the circular ring frame 8 shows a tendency of tilting displacement, the anti jamming guiding unit 10 will contact and be stressed with the protection sleeve 5 to reset the circular ring frame 8 and prevent the circular ring frame 8 from getting stuck.

[0055] In a preferred embodiment, referring to Figure 4 , the anti jamming guiding unit 10 includes a first fixing frame 11a and a second fixing frame 11b. The first fixing frame 11a is embedded with a first guiding ball 12a, and the second fixing frame 11b is embedded with a second guiding ball 12b, where: the first fixing frame 11a and the second fixing frame 11b are symmetrically arranged on both side walls of the circular ring frame 8 respectively. Specifically, part of the guiding ball protrudes outside the fixing frame.

[0056] In this embodiment, when the circular ring frame 8 shows a tendency of tilting displacement, the guiding ball will contact the protection sleeve 5 along the tilting direction and roll under the action of the traction force to reset the circular ring frame 8, so as to prevent the circular ring frame 8 from contacting the upper and lower inner surfaces of the protection sleeve 5 and getting stuck.

[0057] In a preferred embodiment, referring to Figure 4 , a plurality of resistance reducing grooves 13 are provided on the outer wall of the circular ring frame 8, where: the plurality of resistance reducing grooves 13 are used to reduce the resistance borne by the circular ring frame 8 when towing the submarine cable 4.

[0058] Specifically, the resistance reducing grooves 13 are distributed in a circumferential manner along the outer edge of the circular ring frame 8.

[0059] It should be noted that there are impurities such as sand and water in the protection sleeve 5 buried in the ground, which increase the resistance borne by the circular ring frame 8 when towing the submarine cable 4. Based on this, in this embodiment, a plurality of resistance reducing grooves 13 are provided on the outer wall of the circular ring frame 8 for sand and water and other impurities to pass through, so as to reduce the contact area between the circular ring frame 8 and the impurities, and further reduce the resistance borne by the circular ring frame 8.

[0060] In a preferred embodiment, a locking unit is provided on one side of any of the resistance reducing grooves 13, where; any of the tension steel cables 3 passes through the resistance reducing groove 13 and the locking unit, and thus passes through the corresponding circular ring frame 8; the locking unit is used to lock the corresponding tension steel cable 3.

[0061] Specifically, referring to Figure 4The locking unit includes an upper half groove 16 and a lower half groove 17. The upper half groove 16 and the lower half groove 17 are combined by countersunk screws to form a locking groove for the tensioning steel cable 3 to pass through; by adjusting the distance between the upper half groove 16 and the lower half groove 17 by the countersunk screw, the size of the locking groove formed by the two can be adjusted, thereby locking the tensioning steel cable 3.

[0062] In a preferred embodiment, see Figure 6 The locking unit includes a bottom groove 14 and a U-shaped frame 15. The U-shaped frame 15 is inserted into and installed in the bottom groove 14 and locked by bolts to form a locking groove aligned with the corresponding resistance reduction groove 13; the depth of the U-shaped frame 15 inserted into the bottom groove 14 is adjusted and locked by the bolts, so that the size of the locking groove formed by the two can be adjusted, thereby locking the tensioning cable 3.

[0063] In this embodiment, the tensioning steel cable 3 passes through the corresponding resistance reduction groove 13 and the corresponding locking unit, and then passes through the corresponding circular frame 8, and the resistance reduction groove 13 is also used to limit the tensioning steel cable 3. The corresponding tensioning steel cable 3 is locked by the locking unit, so that each resistance reduction module 1 is locked and connected with the tensioning steel cable 3, which is beneficial for the tensioning steel cable 3 and each resistance reduction module 1 to cooperate in sharing the traction load and the pressure load borne by each resistance reduction module 1, avoiding the breakage of the cable end and the damage of the resistance reduction module 1 during the traction process of the submarine cable 4, and enhancing the protection of the submarine cable 4.

[0064] In a preferred embodiment, see Figure 1 , Figure 7 and Figure 8 The traction module 2 includes a sleeve submodule 20, a traction submodule 21, a clamping submodule 22 and a transition submodule 23. The sleeve submodule 20 and the traction submodule 21 are respectively connected to the transition submodule 23. The sleeve submodule 20 is fixedly sleeved on the end of the submarine cable 4, wherein: the sleeve submodule 20 is used to connect the tensioning steel cable 3; the transition submodule 23 is provided with a plurality of strip holes 24 distributed circumferentially along its outer wall; after the armor wire 6 of the submarine cable 4 passes through the strip hole 24, it is clamped on the outer side surface of the sleeve submodule 20 by the sleeve submodule 20 and the clamping submodule 22; the traction submodule 21 is used to connect the external traction equipment.

[0065] Specifically, the width of the long strip hole is slightly larger than the diameter of the armored wire 6; the armored wire 6 passes through the corresponding strip hole 24, then bends and closely adheres to the outer side of the sleeve sub-module 20, and the armored wires 6 passing through the same strip hole 24 are neatly and closely arranged. The clamping sub-module 22 is of an annular structure. The clamping sub-module 22 is fixed to the outside of the sleeve sub-module 20 by screws and cooperates with the sleeve sub-module 20 to clamp the armored wire 6 closely adhering to the outer side of the sleeve sub-module 20. The traction sub-module 21 is connected to the traction steel wire rope of an external traction device.

[0066] In this embodiment, the clamping sub-module 22 is installed on the outer side of the sleeve sub-module 20 and cooperates with the sleeve sub-module 20 to clamp the armored wire 6 of the submarine cable 4 on the outer side of the sleeve sub-module 20, improving the firmness of the connection between the traction module 2 and the armored wire 6 of the submarine cable 4. Furthermore, the component force effect of the armored wire 6 on the front-end traction force of the submarine cable 4 is enhanced, and the stress concentration phenomenon at the end connection of the submarine cable 4 is further reduced.

[0067] In addition, multiple armored wires 6 passing through the same long strip hole are closely arranged, enabling the multiple armored wires 6 to be stressed synergistically and evenly share the traction force under the combined clamping of the clamping sub-module 22 and the sleeve sub-module 20. The width of the long strip hole is slightly larger than the diameter of the armored wire 6, which can limit the armored wire 6 and prevent the armored wire 6 from overlapping or being disordered, thus ensuring the component force effect of the armored wire 6 on the front-end traction force of the submarine cable 4.

[0068] In a preferred embodiment, referring to Figure 9 , the traction module 2 includes a force-dividing disc 25, a traction disc 26, and a fixed sleeve ring 28; the traction disc 26 and the fixed sleeve ring 28 are respectively connected to the force-dividing disc 25; the force-dividing disc 25 is provided with a plurality of perforations 27, where: the fixed sleeve ring 28 is fixedly sleeved on the end of the submarine cable 4; after the armored wires 6 of the submarine cable 4 are stranded into a plurality of groups of armored cables, each group of armored cables passes through the corresponding perforation 27 and is fixedly connected to the force-dividing disc 25, so that a plurality of groups of armored cables are fixedly connected to the force-dividing disc 25; the traction disc 26 is used to connect the tension steel cable 3 and an external traction device.

[0069] Specifically, the central part on one side of the traction disc 26 is connected to the traction steel wire rope of an external traction device, and the central part on the other side of the traction disc 26 is connected to the force-dividing disc 25; a plurality of perforations 27 are evenly distributed in a circular shape on the force-dividing disc 25, enabling the armored cables connecting the perforations 27 to evenly share the traction force.

[0070] In this embodiment, after the adjacent armored wires 6 are divided into multiple groups and stranded into several groups of armored cables, each group of the armored cables passes through the corresponding perforation 27 and is fixedly connected to the force-sharing disc 25, so as to evenly distribute the traction force on each armored cable, thereby reducing the stress concentration phenomenon at the end connection of the submarine cable 4 and enhancing the protection effect on the submarine cable 4. In addition, the fixed sleeve ring 28 is tightly sleeved on the end of the submarine cable 4, which can make each group of armored cables evenly stressed and jointly share the traction force. At the same time, the stranded armored cable is tougher and stronger than a single armored wire 6, enhancing the stability of the traction and resistance reduction structure.

[0071] A traction and resistance reduction structure for a submarine cable 4 provided by the present invention has at least the following advantages compared with the prior art:

[0072] 1. The traction module 2 is connected to the armored wire 6 of the submarine cable 4, so that the armored wire 6 of the submarine cable 4 serves as a force-bearing member for bearing part of the traction load, and the remaining part of the traction load is led to each resistance reduction module 1 distributed along the length direction of the submarine cable 4 through the tension steel cable 3, so that the tension steel cable 3 and the resistance reduction module 1 cooperate to bear the remaining traction load. The above multi-part force-sharing structure can prevent the end of the submarine cable 4 from being overstressed and broken during the process of towing the submarine cable 4. In addition, each resistance reduction module 1 cooperates to prevent the outer surface of the submarine cable 4 from directly contacting the inner surface of the protective sleeve 5. Under the action of the traction force, the resistance reduction balls 7 in the resistance reduction module 1 drive the submarine cable 4 to move forward in a rolling manner, which can not only reduce the resistance generated when towing the submarine cable 4, but also avoid wearing the protective layer on the surface of the submarine cable 4.

[0073] 2. A tightening and anti-slip layer 9 is installed on the inner side of the ring frame 8, which can ensure that the ring frame 8 can be tightly sleeved on the submarine cable 4, avoiding the displacement of the submarine cable 4 during the traction process and affecting the traction work of the submarine cable 4.

[0074] 3. An anti-clamping and guiding unit 10 is arranged on the outer edge of the ring frame 8 and is distributed in a circumferential manner along the ring frame 8 to prevent the ring frame 8 from tilting and jamming during the process of moving forward along the protective sleeve 5.

[0075] 4. A plurality of resistance reduction grooves 13 are arranged on the outer edge of the ring frame 8 and are distributed in a circumferential manner along its outer edge. The resistance reduction grooves 13 can be used for sand and water to pass through, reducing the resistance during the movement of the resistance reduction module 1 and the submarine cable 4, and can also facilitate the passage of the tension steel cable 3 to limit the tension steel cable 3. In addition, the ball module and the tension steel cable 3 can be fixedly connected through the locking unit.

[0076] As used herein, "embodiments" means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in this specification.

[0077] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as within the protection scope of the present invention. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An undersea cable traction and resistance reduction structure, applicable to undersea cables, characterized in that It includes a traction module, several resistance reduction modules and several tension steel cables, where: The traction module is fixedly sleeved on the end of the submarine cable and is connected to the armor wires of the submarine cable; Several of the resistance reduction modules are respectively fixedly sleeved on the submarine cable to reduce the frictional resistance when pulling the submarine cable; Each tension steel cable passes through several of the resistance reduction modules and is connected to the traction module.

2. The drag reduction structure for submarine cable traction according to claim 1, characterized in that, The resistance reduction module includes a circular ring frame and several resistance reduction balls, where: The circular ring frame is fixedly sleeved on the submarine cable; Several chutes are provided on the outer wall of the circular ring frame; Each resistance reduction ball is slidably inserted into the corresponding chute, so that several resistance reduction balls are slidably inserted into several chutes to reduce the frictional resistance when pulling the submarine cable; Each tension steel cable passes through several of the circular ring frames and is connected to the traction module.

3. The drag reduction structure for submarine cable traction according to claim 2, characterized in that, The resistance reduction module further includes a tightening anti-slip layer, and the tightening anti-slip layer is arranged on the inner wall of the circular ring frame, where: The tightening anti-slip layer fixes the circular ring frame on the submarine cable to prevent displacement between the circular ring frame and the submarine cable.

4. A submarine cable traction and resistance reduction structure according to claim 3, characterized in that, The tightening anti-slip layer is provided with a limiting groove, and the circular ring frame is provided with a limiting convex part, where: The limiting groove and the limiting convex part cooperate to fix the tightening anti-slip layer and the circular ring frame.

5. A submarine cable traction and resistance reduction structure according to claim 2, characterized in that The circular ring frame further includes several anti-jamming guiding units, where: Several of the anti-jamming guiding units are respectively arranged on the side wall of the circular ring frame and are circumferentially distributed along the side wall of the circular ring frame; Several of the anti-jamming guiding units are used to prevent the circular ring frame from tilting and jamming.

6. The submarine cable traction and resistance reduction structure according to claim 5, characterized in that, The anti-jamming guiding unit includes a first fixing frame and a second fixing frame. The first fixing frame is embedded with a first guiding ball, and the second fixing frame is embedded with a second guiding ball, where: The first fixing frame and the second fixing frame are respectively symmetrically arranged on the two side walls of the circular ring frame.

7. The drag reduction structure for submarine cable traction according to claim 2, characterized in that, Several resistance reduction grooves are provided on the outer wall of the circular ring frame, where: Several of the resistance reduction grooves are used to reduce the resistance borne by the circular ring frame when pulling the submarine cable.

8. The submarine cable traction and resistance reduction structure according to claim 7, characterized in that, A locking unit is arranged on one side of any of the resistance reduction grooves, where; Any tension steel cable passes through the resistance reduction groove and the locking unit, and thus passes through the corresponding circular ring frame; The locking unit is used to lock the corresponding tension steel cable.

9. The drag reduction structure for submarine cable traction according to claim 1, characterized in that, The traction module includes a sleeve sub-module, a traction sub-module and a clamping sub-module. The sleeve sub-module connects the traction sub-module, and the sleeve sub-module is fixedly sleeved on the end of the submarine cable, where: The sleeve sub-module is used to connect the tension steel cable and includes a strip-shaped hole; The armor wires of the submarine cable pass through the strip-shaped hole and are clamped on the outer side surface of the sleeve sub-module through the cooperation of the sleeve sub-module and the clamping sub-module; The traction sub-module is used to connect an external traction device.

10. A submarine cable traction and resistance reduction structure according to claim 1, characterized in that, The traction module includes a force-sharing disc, a traction disc and a fixing ring; the traction disc and the fixing ring are respectively connected to the force-sharing disc; the force-sharing disc is provided with several through holes, where: The fixing ring is fixedly sleeved on the end of the submarine cable; After the armor wires of the submarine cable are stranded into several groups of armored cables, each group of the armored cables passes through the corresponding perforation and is fixedly connected to the force-sharing disc, so that several groups of the armored cables are fixedly connected to the force-sharing disc; The traction disc is used to connect the tension steel cable and an external traction device.

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