Ultra-long-distance submarine cable laying device and method

Abstract

The invention discloses an ultra-long-distance submarine cable laying device and method, and relates to the technical field of submarine cable laying, the ultra-long-distance submarine cable laying device comprises a base, the bottom of the base is connected with anchoring supporting legs, the upper part of the base is connected with a submarine cable clamping mechanism used for clamping a submarine cable, and the submarine cable clamping mechanism is connected with a sliding block; the sliding block is slidably connected with a sliding rod parallel to the axis of the submarine cable, the base is assembled and connected with a counter-force frame at the rear end of the sliding rod, the counter-force frame is connected with a hydraulic push rod, the output end of the hydraulic push rod is connected with the submarine cable clamping mechanism, and the submarine cable clamping mechanism is driven by the hydraulic push rod to do linear reciprocating motion along the sliding rod; the submarine cable clamping mechanism is used for clamping the submarine cable in the pushing construction process, and then continuous and uniform axial pushing force is applied to the submarine cable through the hydraulic push rod and forms a forward pulling-backward pushing synergistic effect with land side dragging force; the risks of cable stretching, armored layer offset, insulating layer damage and the like caused by too large dragging force are effectively relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine cable laying, in particular to a long-distance submarine cable laying device and method. BACKGROUND

[0002] With the increasing demand for ocean resource development and long-distance cross-sea power transmission, long-distance submarine cable laying projects are increasing, which are commonly used in island power supply, offshore wind power grid connection, cross-sea communication and other fields. Traditional submarine cable laying methods mainly include excavation laying and non-excavation directional drilling laying, etc. Directional drilling laying is widely used in environmentally sensitive areas such as submarine cable crossing beaches, coral reefs and port shorelines due to its small impact on the ecological environment and high construction precision. In non-excavation directional drilling laying construction, the cable is usually pulled on the land side, and in long-distance laying, as the length of the cable increases, the cable drag force, weight and inner wall friction resistance of the submarine protection steel pipe significantly increase during the pulling process. In order to ensure the smooth penetration of the cable, a larger pulling force needs to be applied on the land side. However, excessive pulling force may cause mechanical damage to the cable, and the protection steel pipe may also be lifted and misaligned due to the upward component of the cable pulling force, thereby affecting the construction precision and structural safety. Therefore, there is an urgent need for a technical solution that adds power assistance at the far end of the cable crossing path to reduce the cable pulling force, reduce structural damage and improve laying efficiency. SUMMARY

[0003] In view of the above problems, the present application provides a long-distance submarine cable laying device and method, which can effectively solve the problem of continuous increase of land-side pulling force caused by long cable back-pulling path, and further cause cable structural damage and protection steel pipe misalignment. The specific technical solution is as follows: A long-distance submarine cable laying device, comprising a base, the bottom of the base is connected with anchor legs, the upper part of the base is connected with a submarine cable clamping mechanism for clamping the submarine cable, the submarine cable clamping mechanism is connected with a sliding block, the sliding block is slidingly connected with a sliding rod parallel to the axis of the submarine cable, the base is assembled and connected with a reaction frame at the rear end of the sliding rod, the reaction frame is connected with a hydraulic push rod, the output end of the hydraulic push rod is connected with the submarine cable clamping mechanism, and the submarine cable clamping mechanism is driven by the hydraulic push rod to make linear reciprocating motion along the sliding rod.

[0004] Preferably, the submarine cable clamping mechanism comprises a front panel and a rear panel connected on the front and rear sides of the sliding block respectively, the top of the front panel and the rear panel is formed with an arc-shaped sliding groove respectively, and a clamping assembly for clamping the submarine cable is movably connected in the arc-shaped sliding groove, two rotating hydraulic rods are arranged on the front and rear sides of the clamping assembly respectively, the rotating hydraulic rods drive the clamping assembly to rotate around the axis of the submarine cable, and adjustment or directional pushing operation of the submarine cable is realized.

[0005] Preferably, the clamping assembly comprises two arc-shaped clamping blocks arranged in left-right symmetry, and a hinge shaft connected to the two arc-shaped clamping blocks, the arc-shaped clamping blocks being hinged to the hinge shaft, the front and rear ends of one of the arc-shaped clamping blocks being respectively provided with a first connecting rod and a second connecting rod movably connected in an arc-shaped sliding groove, the upper end of a rotating hydraulic rod on the front side being hinged to the first connecting rod and the lower end being hinged to a sliding block, the upper end of a rotating hydraulic rod on the rear side being connected to the second connecting rod and the lower end being fixedly connected to another sliding block.

[0006] Preferably, a clamping hydraulic assembly is arranged below the arc-shaped clamping blocks to drive the opening and closing of the arc-shaped clamping blocks, and the outer sides of the two arc-shaped clamping blocks are provided with connecting members connected to the clamping hydraulic assembly.

[0007] Preferably, the clamping hydraulic assembly comprises first and second clamping hydraulic rods arranged in left-right symmetry, and first and second connecting rods, and the upper ends of the first and second clamping hydraulic rods are respectively connected to the connecting members of the two arc-shaped clamping blocks, the lower end of the first clamping hydraulic rod is hinged to the lower end of the second clamping hydraulic rod, the upper ends of the first and second connecting rods are hinged to the hinge shafts of the two arc-shaped clamping blocks, the lower end of the first connecting rod is hinged to the lower part of the first clamping hydraulic rod, and the lower end of the second connecting rod is hinged to the lower part of the second clamping hydraulic rod.

[0008] Preferably, a fixed support is connected to the top of the front side of the base, one end of a flexible corrugated restraint tube is connected to the fixed support, and the other end of the flexible corrugated restraint tube is inserted into a protective steel pipe at a submarine cable pull-in point.

[0009] Preferably, a plurality of self-lubricating plastic rings are arranged at equal intervals on the submarine cable to reduce the frictional resistance between the submarine cable and the protective steel pipe.

[0010] Preferably, the self-lubricating plastic ring is composed of two half-rings in butt joint, the half-rings are made of low-friction and high-strength plastic material, and the material is mixed with graphite, graphene or carbon nanotube solid lubrication reinforcing components to improve the wear resistance and deformation resistance.

[0011] A method for laying a super-long distance submarine cable, realized based on a super-long distance submarine cable laying device, comprising the steps of: S1, integrally fixing a relay power device to the distal end of a submarine cable crossing path through an anchoring leg, specifying a seabed installation point or an island side specified installation point, and stably clamping the submarine cable on a submarine cable clamping mechanism; S2, starting a hydraulic push rod to drive the submarine cable clamping mechanism to slide forward along a sliding rod, thereby pushing the submarine cable towards the land, and realizing quantitative propulsion of the submarine cable; S3, when the submarine cable is pushed to the target position, the submarine cable clamping mechanism is controlled to stably release the clamping force, the submarine cable is loosened, the submarine cable clamping mechanism is returned to the starting position through the hydraulic push rod, and then the submarine cable clamping mechanism is controlled to clamp the submarine cable again, and the next round of pushing operation is prepared; S4, repeating steps S2 to S3, and cyclically performing the pushing operation until the continuous pushing laying of the submarine cable is completed.

[0012] Preferably, in step S1, for the submarine cable offshore laying condition, after the submarine cable is clamped on the submarine cable clamping mechanism on the offshore work ship, the relay power device and the submarine cable are hoisted as a whole to the specified seabed installation point by using hoisting equipment, and the anchor leg is stably inserted into the seabed through vibration construction; for the submarine cable island laying condition, the relay power device is first stably installed at the specified installation point on the island side, and then the submarine cable is hoisted into position and clamped.

[0013] Compared with the prior art, the beneficial effects of the present application are: 1. The relay power device is arranged at the far end of the cable crossing path on the ocean side or the island side, the submarine cable is clamped by the submarine cable clamping mechanism during the pushing construction process, and then a continuous and uniform axial pushing force is applied to the submarine cable by the hydraulic push rod, so that the total traction required by the cable is significantly reduced, and the risks of cable stretching, armor layer deviation and insulation layer damage caused by excessive traction are alleviated.

[0014] 2. The vertical component force generated by the relay power device on the cable during the pushing process can make the cable tightly adhere to the bottom of the protective steel pipe, effectively enhance the vertical stability of the cable, reduce the contact frequency of the top surface of the cable and the inner wall of the protective steel pipe, significantly slow down the impact and disturbance of the cable on the inner wall of the protective steel pipe, thereby reducing the risk of lifting and structural misplacement of the protective steel pipe, and improving the mechanical stability and safety performance of the entire laying system.

[0015] 3. The vertical component force generated by the relay power device on the cable during the pushing process makes the submarine cable tightly adhere to the bottom of the protective steel pipe, effectively enhances the vertical stability of the cable, reduces the contact frequency of the top surface of the cable and the inner wall of the protective steel pipe, significantly slows down the impact and disturbance of the cable on the inner wall of the protective steel pipe, thereby reducing the risk of lifting and structural misplacement of the protective steel pipe, and improving the mechanical stability and safety performance of the entire laying system. Compared with the traditional one-way traction laying method, the embodiment can significantly reduce the stress per unit length of the cable while ensuring the construction progress, reduce the disturbance and damage to the inner wall of the protective steel pipe during back dragging, and significantly improve the overall adaptability and construction reliability of the laying system.

[0016] 4、The present application is ingenious, by setting two rotating hydraulic rods on the front and back of the clamping assembly, rotating the hydraulic rod to drive the clamping assembly to rotate around the axis of the submarine cable, realizing the adjustment or directional pushing operation of the submarine cable. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0018] Figure 1 The structure schematic diagram of the relay power device in the offshore laying working condition of the present application.

[0019] Figure 2 The structure schematic diagram of the relay power device in the island laying working condition of the present application.

[0020] Figure 3 The force analysis diagram of the submarine cable laying process without the relay power device.

[0021] Figure 4 The force analysis diagram of the submarine cable laying process with the relay power device.

[0022] Figure 5 The constraint effect schematic of the protective steel pipe to the submarine cable.

[0023] Figure 6 The structure schematic diagram of the relay power device of the present application.

[0024] Figure 7 The local structure schematic diagram of the relay power device of the present application.

[0025] Figure 8 The structure schematic diagram of the submarine cable clamping mechanism of the present application.

[0026] Figure 9 The front view of the submarine cable clamping mechanism of the present application.

[0027] Figure 10 The side view of the submarine cable clamping mechanism of the present application.

[0028] Figure 11 The explosion view of the submarine cable clamping mechanism of the present application.

[0029] Figure 12 The connection schematic diagram of the clamping hydraulic assembly and the clamping assembly of the present application.

[0030] Figure 13 The connection schematic diagram of the rotating hydraulic rod and the clamping assembly of the present application.

[0031] Figure 14 Schematic diagram for clamping action of the submarine cable clamping mechanism of the present application.

[0032] Figure 15 Schematic diagram for rotating action of the submarine cable clamping mechanism of the present application.

[0033] Figure 16 Schematic diagram for structure of the corrugated pipe fixing support of the present application.

[0034] Figure 17 Schematic diagram for installation of the self-lubricating plastic ring of the present application.

[0035] Figure 18 Schematic diagram for structure of the self-lubricating plastic ring of the present application.

[0036] Figure 19 Schematic diagram for installation of the relay power device under offshore laying condition.

[0037] Figure 20 Schematic diagram for installation of the relay power device under island laying condition.

[0038] Figure 21 Schematic diagram for structure of the relay power device pushing submarine cable.

[0039] Figure 22 Schematic diagram for structure of the relay power device releasing submarine cable and resetting.

[0040] 1-protective steel pipe, 2-submarine cable, 3-offshore working vessel, 4-relay power device, 401-base, 402-counterforce frame, 403-hydraulic push rod, 404-submarine cable clamping mechanism, 4041-arc-shaped clamping block, 40411-first connecting rod, 40412-second connecting rod, 40413-connecting mechanism, 4042-front panel, 4043-rear panel, 4044-sliding block, 4045-rotating hydraulic rod, 4046-first clamping hydraulic rod, 4047-second clamping hydraulic rod, 4048-first connecting rod, 4049-second connecting rod, 405-sliding rod, 406-limiting block, 407-anchoring leg, 5-self-lubricating plastic ring, 501-semi-circular ring, 502-lubricant, 6-flexible corrugated restraint pipe, 7-fixing support. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0042] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1: like Figures 1-2 As shown, this embodiment provides an ultra-long-distance submarine cable laying device. By setting up a relay power device at the far end of the cable crossing path on the ocean side or island side, the device clamps the cable and applies axial thrust, forming a synergistic pull-push effect with the towing force on the land side. This significantly reduces the total traction force required for the cable and mitigates the risks of cable stretching, armor layer misalignment, and insulation layer damage caused by excessive towing force. Furthermore, as... Figures 3-4 As shown, the vertical component of the force exerted on the cable by the relay power unit 4 during the jacking process. The submarine cable 2 is urged to adhere to the bottom of the protective steel pipe 1, effectively enhancing the vertical stability of the cable, reducing the contact frequency of the top surface of the cable with the inner wall of the protective steel pipe 1, significantly slowing down the impact and disturbance of the cable on the inner wall of the protective steel pipe 1, thereby reducing the risk of lifting and structural misalignment of the protective steel pipe 1, and improving the mechanical stability and safety performance of the entire laying system. Compared with the traditional one-way traction laying method, the embodiment can ensure the construction progress while significantly reducing the stress per unit length of the cable, reducing the disturbance and damage to the inner wall of the protective steel pipe 1 during back dragging, and significantly improving the overall adaptability and construction reliability of the laying system. It should be noted that, Figure 3 In the figure, 1 is a protective steel pipe, and 2 is a submarine cable, F L is the total traction force (pulling force) applied to the submarine cable, F LV and F LH is the vertical and horizontal component of the total traction force. Figure 3 A key stress scenario in the submarine cable laying process is shown. During the pulling and laying process of the submarine cable, the vertical component of the traction force F LV easily causes the protective steel pipe of the cable to lift and misalign (as shown by the dashed line and arrow in the figure), thereby affecting the positioning accuracy of the construction and posing a potential threat to the structural safety. Figure 4 In the figure, F T is the total pushing force applied to the submarine cable by the relay power device, F TV and F TH is the vertical and horizontal component of the total pushing force. During the pulling and laying process of the submarine cable, the relay power device additionally applies a pushing force, and the vertical component of the pushing force F L During the pulling and laying process, the relay power device additionally applies a pushing force, and the vertical component of the pushing force on one hand urges the cable to adhere to the bottom of the protective steel pipe, effectively enhances the vertical stability of the cable, reduces the contact frequency of the top surface of the cable with the inner wall of the steel pipe, and significantly slows down the impact and disturbance of the cable on the inner wall of the steel pipe; on the other hand, the vertical component of the pushing force is opposite to the vertical component of the traction force at the pulling outlet, thereby offsetting or weakening the lifting force acting on the steel pipe, thus reducing the risk of lifting and structural misalignment of the steel pipe, and improving the mechanical stability and safety performance of the entire laying system.

[0046] As Figure 5As shown, the present embodiment takes full advantage of the structural rigidity characteristics of the submarine cable itself and the continuous restraint characteristics of the protective steel pipe 1 to build an effective pushing mechanism suitable for long-distance submarine cable laying. The outer diameter of the common submarine cable 2 is usually 250-300 mm, and the outside of the water-blocking conductor is wrapped with an insulator, an alloy lead sleeve, a filler strip, a PP rope lining, a galvanized steel wire, and a PE rope outer layer, etc. to form a composite structure with high compression and bending stiffness, which can withstand moderate axial thrust under sufficient support conditions and is not prone to bending instability. At the same time, the protective steel pipe 1 used for cable crossing protection is usually a high-stiffness steel sleeve that provides continuous and rigid lateral support to the cable along the back-dragging path. Due to the small gap between the inner wall of the protective steel pipe 1 and the outer diameter of the cable, on the one hand, the cable is stably radially constrained to limit its folding buckling deformation; on the other hand, during the application of the axial pushing force by the relay power device 4, the radial reaction force of the protective steel pipe 1 wall on the cable and the pushing force jointly act in the same direction as the axis of the protective steel pipe 1, so that the protective steel pipe 1 forms a pipe constraint effect on the cable, allowing the cable to be smoothly pushed under the action of the relay power device 4, effectively preventing cable buckling, deviation or jamming, etc., thereby ensuring the feasibility, safety and stability of the relay power pushing process.

[0047] Reference Figures 1-6The application provides a super-long distance submarine cable laying device, which comprises a base 401, the bottom of the base 401 is connected with anchor supporting legs 407, the upper part of the base 401 is connected with a submarine cable clamping mechanism 404 used for clamping a submarine cable, the submarine cable clamping mechanism 404 is connected with a sliding block 4044, the sliding block 4044 is slidingly connected with a sliding rod 405 parallel to the axis of the submarine cable 2, the base 401 is connected with a counterforce frame 402 at the rear end of the sliding rod 405, the counterforce frame 402 is connected with a hydraulic push rod 403, the output end of the hydraulic push rod 403 is connected with the submarine cable clamping mechanism 404, and the submarine cable clamping mechanism 404 is driven to make linear reciprocating motion along the sliding rod 405 through the hydraulic push rod 403; so as to drive the submarine cable clamping mechanism 404 to make linear motion, and drive the submarine cable 2 to move. The counterforce frame 402 in the embodiment can serve as a counterforce supporting structure of the hydraulic push rod 403 to ensure stable transmission of the pushing force, and can provide lateral limiting and supporting functions for the cable to prevent the cable from moving and ensure the continuity of the pushing process; the submarine cable clamping mechanism 404 clamps the submarine cable 2 during the pushing construction process, and then the submarine cable clamping mechanism 404 is driven to realize controllable linear reciprocating sliding along the sliding rod 405 through the hydraulic push rod 403, so that the submarine cable 2 is subjected to continuous and uniform axial pushing force, and the front pulling and rear pushing synergy with the land side pulling force is formed, and the relay pushing function of the submarine cable 2 is realized. Furthermore, the front and rear ends of the sliding rod 405 are respectively provided with limiting blocks 406 used for limiting the motion stroke of the submarine cable clamping mechanism 404. The limiting blocks 406 can also be other limiting components that can limit the motion stroke of the submarine cable clamping mechanism 404. It should be specifically pointed out that the cable, the submarine cable and the submarine cable mentioned in the text can be replaced equivalently. The relay power device 4 mentioned in the text is used to refer to the super-long distance submarine cable laying device as a whole.

[0048] With reference to Figures 8-15 The submarine cable clamping mechanism 404 comprises front and rear face plates 4042 and 4043 connected to the front and rear sides of the sliding block 4044 respectively, the top parts of the front and rear face plates 4042 and 4043 are respectively formed with arc-shaped sliding grooves, the arc-shaped sliding grooves are movably connected with clamping assemblies for clamping the submarine cable, the front and rear sides of the clamping assemblies are respectively provided with two rotating hydraulic rods 4045, the clamping assemblies are driven to rotate around the axis of the submarine cable 2 through the rotating hydraulic rods 4045, and the adjustment or directional pushing operation of the submarine cable 2 is realized. In the embodiment, the extension and shortening of the rotating hydraulic rods 4045 are controlled, so that the sliding of the clamping assemblies in the arc-shaped sliding grooves is controlled, the clamping assemblies drive the submarine cable 2 to move in the arc-shaped sliding grooves, and the directional adjustment of the submarine cable 2 is realized.

[0049] With reference to Figure 10 , Figures 14-15The clamping assembly comprises two arc-shaped clamping blocks 4041 arranged in left-right symmetry, the two arc-shaped clamping blocks 4041 are connected with a hinged shaft, the arc-shaped clamping block 4041 is hinged with the hinged shaft, the front and rear ends of one arc-shaped clamping block 4041 are respectively provided with a first connecting rod 40411 and a second connecting rod 40412 movably connected in an arc-shaped sliding groove, the upper end of a rotary hydraulic rod 4045 located at the front side is hinged with the first connecting rod 40411, the lower end is hinged with a sliding block 4044, the upper end of a rotary hydraulic rod 4045 located at the rear side is connected with the second connecting rod 40412, the lower end is fixedly connected with another sliding block 4044. Further, the embodiment further limits the clamping assembly, the arc-shaped clamping block 4041 is used for covering the submarine cable 2, the arc-shaped clamping block 4041 is connected with the hinged shaft and can rotate relative to the hinged shaft, the first connecting rod 40411 is fixedly arranged relative to the arc-shaped clamping block 40411 and can slide in the arc-shaped sliding groove, when the rotary hydraulic rod 4045 connected with the first connecting rod 40411 works, the first connecting rod 40411 slides in the arc-shaped sliding groove, so as to realize the sliding of the arc-shaped clamping block 4041 as a whole.

[0050] With reference to Figures 8-15 The lower side of the arc-shaped clamping block 4041 is provided with a clamping hydraulic assembly for driving the opening and closing of the arc-shaped clamping block 4041, the outer side of the two arc-shaped clamping blocks 4041 is provided with a connecting member 40413 connected with the clamping hydraulic assembly. The opening and closing of the two arc-shaped clamping blocks 4041 is driven by the clamping hydraulic assembly, so as to realize the clamping and releasing of the submarine cable 2, the connecting member 40413 connected with the arc-shaped clamping block 4041 is connected with the clamping hydraulic assembly, so as to realize the control of the arc-shaped clamping block 4041 through the clamping hydraulic assembly, further, the clamping hydraulic assembly comprises a first clamping hydraulic rod 4046 and a second clamping hydraulic rod 4047 arranged in left-right symmetry, a first connecting rod 4048 and a second connecting rod 4049, the upper end of the first clamping hydraulic rod 4046 and the upper end of the second clamping hydraulic rod 4047 are respectively connected with the connecting member 40413 of the two arc-shaped clamping blocks 4041, the lower end of the first clamping hydraulic rod 4046 is hinged with the lower end of the second clamping hydraulic rod 4047, the upper end of the first connecting rod 4048 and the upper end of the second connecting rod 4049 are hinged to the hinged shaft of the two arc-shaped clamping blocks 4041, the lower end of the first connecting rod 4048 is hinged to the lower part of the first clamping hydraulic rod 4046, and the lower end of the second connecting rod 4049 is hinged to the lower part of the second clamping hydraulic rod 4047.

[0051] With this configuration, when the output ends of the first clamping hydraulic rod 4046 and the second clamping hydraulic rod 4047 extend, the connection point with the connecting member 40413 tends to move upward. Simultaneously, the connecting member 40413, constrained by the hinge axis of the arc-shaped clamping block 4041, can only rotate around the hinge axis. Therefore, the connection point with the connecting member 40413 can only move in an arc, moving inward, thus achieving clamping of the submarine cable 2. The initial lengths of the first connecting rod 4048 and the second connecting rod 4049 are equal. The lengths of the lower parts of the second clamping rod 4047 and the first clamping hydraulic rod 4046 are the same as the lengths of the first connecting rod 4048 and the second connecting rod 4049. Therefore, the quadrilateral formed by their four sides is always an axially symmetric figure. (Refer to...) Figure 14 Regardless of the position of the hinge shaft within the arc-shaped groove, the first clamping hydraulic rod 4046 and the second clamping pressure rod 4047 are always symmetrically arranged relative to the line connecting the lower end of the first clamping hydraulic rod 4046 and the lower end of the second clamping hydraulic rod 4047, and the upper end hinge point of the first connecting rod 4048 and the second connecting rod 4049. When the extension lengths of the first clamping hydraulic rod 4046 and the second clamping hydraulic rod 4047 are the same, the angles of change of the two arc-shaped clamping blocks 4041 relative to their initial positions are the same.

[0052] Reference Figure 4 and Figure 16 A fixed bracket 7 is connected to the upper front side of the base 401. One end of the fixed bracket 7 is connected to a flexible corrugated restraint tube 6, and the other end of the flexible corrugated restraint tube 6 is inserted into the protective steel pipe 1 located at the towing point of the submarine cable 2. The flexible corrugated restraint tube 6 is located between the relay power device and the towing point of the submarine cable 2. The front end of the flexible corrugated restraint tube 6 is inserted into the protective steel pipe 1, and its rear end is supported on the top front end of the base 401 by the fixed bracket 7 of the flexible corrugated restraint tube 6. In this embodiment, the flexible corrugated restraint tube 6 is designed to adapt to the deformation of the submarine cable 2 during installation, according to the curvature change of the submarine cable 2.

[0053] Reference Figures 17-18 Furthermore, multiple self-lubricating plastic rings 5 ​​are evenly spaced along the submarine cable 2. These self-lubricating plastic rings 5 ​​reduce the frictional resistance between the submarine cable 2 and the protective steel pipe 1. Each self-lubricating plastic ring 5 consists of two semi-circular rings 501 joined together, facilitating rapid installation on the outside of the cable during construction. The semi-circular rings 501 are made of low-friction, high-strength plastic material, and are mixed with solid lubricating reinforcing components such as graphite, graphene, or carbon nanotubes to improve their wear resistance and deformation resistance, ensuring good lubrication and structural stability even under high-pressure contact conditions.

[0054] Reference Figure 17The self-lubricating plastic ring 5 is coated with lubricant 502, which is an environmentally friendly composite lubricating paste. It can be prepared by mixing and processing waste engine oil, diesel oil and fine-particle clay such as bentonite and other industrial wastes in a certain proportion. The specific proportion can be set according to the actual lubrication needs. The lubricant has good adhesion, penetration and water resistance, which not only significantly reduces the frictional resistance between the cable and the protective steel pipe 1, but also reflects the environmental protection concept of resource recycling and green construction.

[0055] Example 2: A method for laying ultra-long-distance submarine cables, based on an ultra-long-distance submarine cable laying device, includes the following steps: S1. The relay power unit 4 is fixed as a whole to the far end of the path through which the submarine cable 2 crosses via the anchoring leg 407. The designated installation point is on the seabed or on the island side. The submarine cable 2 is then securely clamped onto the submarine cable clamping mechanism 404. S2. Activate the hydraulic push rod 403 to drive the submarine cable clamping mechanism 404 to slide forward along the slide rod 4044, thereby pushing the submarine cable 2 towards the land, achieving quantitative advancement of the submarine cable 2; Figure 21 As shown; S3. After the submarine cable 2 is pushed to the target position, the cable clamping mechanism 404 is controlled to release the clamping force securely, releasing the submarine cable 2. The hydraulic push rod 403 then returns the cable clamping mechanism 404 to its starting position, and the cable clamping mechanism 404 is controlled to re-clamp the submarine cable 2, preparing for the next round of pushing operation. Figure 22 As shown; S4. Repeat steps S2 to S3 to perform the jacking operation in a cyclical manner until the continuous jacking and laying of submarine cable 2 is completed.

[0056] Reference Figure 1 , Figure 2 and Figure 19 In step S1, for the offshore laying of submarine cable 2, after clamping submarine cable 2 to submarine cable clamping mechanism 404 on the offshore working vessel 3, the relay power unit and submarine cable 2 are hoisted together to the designated seabed installation point using hoisting equipment, and the anchoring leg 407 is firmly inserted into the seabed through vibration construction; for the island laying of submarine cable 2, the relay power unit is first firmly installed at the designated installation point on the island side, and then the submarine cable 2 is hoisted into place and clamped.

[0057] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for laying ultra-long-distance submarine cables, characterized in that, The system includes a base (401), with anchor legs (407) connected to the bottom of the base (401). A cable clamping mechanism (404) for clamping the submarine cable is connected to the upper part of the base (401). A slider (4044) is connected to the cable clamping mechanism (404). The slider (4044) is slidably connected to a slide rod (405) parallel to the axis of the submarine cable (2). A reaction frame (402) is assembled and connected to the rear end of the slide rod (405) on the base (401). A hydraulic push rod (403) is connected to the reaction frame (402). The output end of the hydraulic push rod (403) is connected to the cable clamping mechanism (404). The cable clamping mechanism (404) is driven to reciprocate linearly along the slide rod (405) by the hydraulic push rod (403).

2. The ultra-long-distance submarine cable laying device according to claim 1, characterized in that, The submarine cable clamping mechanism (404) includes a front panel (4042) and a rear panel (4043) respectively connected to the front and rear sides of the slider (4044). The top of the front panel (4042) and the rear panel (4043) are respectively formed with arc-shaped grooves. A clamping component for clamping the submarine cable is movably connected in the arc-shaped groove. Two rotating hydraulic rods (4045) are respectively provided on the front and rear sides of the clamping component. The rotating hydraulic rods (4045) drive the clamping component to rotate around the axis of the submarine cable (2) to realize the adjustment or directional pushing operation of the submarine cable (2).

3. The ultra-long-distance submarine cable laying device according to claim 2, characterized in that, The clamping assembly includes two arc-shaped clamping blocks (4041) arranged symmetrically on the left and right sides. The two arc-shaped clamping blocks (4041) are connected by a hinge shaft. The arc-shaped clamping blocks (4041) are hinged to the hinge shaft. The front and rear ends of one of the arc-shaped clamping blocks (4041) are respectively provided with a first connecting rod (40411) and a second connecting rod (40412) that are movably connected in an arc-shaped slide groove. The upper end of the rotating hydraulic rod (4045) located on the front side is hinged to the first connecting rod (40411), and the lower end is hinged to the slider (4044). The upper end of the rotating hydraulic rod (4045) located on the rear side is connected to the second connecting rod (40412), and the lower end is fixedly connected to the other slider (4044).

4. The ultra-long-distance submarine cable laying device according to claim 3, characterized in that, Below the arc-shaped clamping block (4041) is a clamping hydraulic assembly that drives the arc-shaped clamping block (4041) to open and close, and on the outer sides of the two arc-shaped clamping blocks (4041) are connecting members (40413) that connect to the clamping hydraulic assembly.

5. The ultra-long-distance submarine cable laying device according to claim 4, characterized in that, The clamping hydraulic assembly includes a first clamping hydraulic rod (4046) and a second clamping hydraulic rod (4047) arranged symmetrically on the left and right, a first connecting rod (4048) and a second connecting rod (4049). The upper ends of the first clamping hydraulic rod (4046) and the upper ends of the second clamping hydraulic rod (4047) are respectively connected to the connecting members (40413) of the two arc-shaped clamping blocks (4041). The lower end of the first clamping hydraulic rod (4046) is hinged to the lower end of the second clamping hydraulic rod (4047). The upper ends of the first connecting rod (4048) and the upper ends of the second connecting rod (4049) are hinged to the hinge shafts of the two arc-shaped clamping blocks (4041). The lower end of the first connecting rod (4048) is hinged to the lower part of the first clamping hydraulic rod (4046), and the lower end of the second connecting rod (4049) is hinged to the lower part of the second clamping hydraulic rod (4047).

6. The ultra-long-distance submarine cable laying device according to claim 1, characterized in that, A fixed bracket (7) is connected to the upper front side of the base (401). One end of the fixed bracket (7) is connected to a flexible corrugated constraint tube (6). The other end of the flexible corrugated constraint tube (6) is inserted into the protective steel pipe (1) located at the towing point of the submarine cable (2).

7. The ultra-long-distance submarine cable laying device according to claim 6, characterized in that, Multiple self-lubricating plastic rings (5) are evenly spaced on the submarine cable (2) to reduce the frictional resistance between the submarine cable (2) and the protective steel pipe (1).

8. The ultra-long-distance submarine cable laying device according to claim 7, characterized in that, The self-lubricating plastic ring (5) is composed of two semi-circular rings (501) joined together. The semi-circular rings (501) are made of low-friction, high-strength plastic material and are mixed with graphite, graphene or carbon nanotube solid lubrication reinforcing components to improve their wear resistance and deformation resistance.

9. A method for laying ultra-long-distance submarine cables, characterized in that, Based on the ultra-long-distance submarine cable laying device according to any one of claims 1 to 8, the method includes the following steps: S1. The relay power unit is fixed as a whole to the far end of the path of the submarine cable (2) by the anchoring leg (407), and the seabed installation point or the island side installation point is designated. The submarine cable (2) is firmly clamped on the submarine cable clamping mechanism (404). S2. Start the hydraulic push rod (403) to drive the submarine cable clamping mechanism (404) to slide forward along the slide rod (4044), thereby driving the submarine cable (2) to push towards the land, and realizing the quantitative propulsion operation of the submarine cable (2); S3. When the submarine cable (2) is pushed to the target position, control the submarine cable clamping mechanism (404) to release the clamping force and loosen the submarine cable (2). Use the hydraulic push rod (403) to make the submarine cable clamping mechanism (404) return to the starting position, and then control the submarine cable clamping mechanism (404) to clamp the submarine cable (2) again to prepare for the next round of pushing operation. S4. Repeat steps S2 to S3 to perform the jacking operation in a cyclical manner until the continuous jacking laying of the submarine cable (2) is completed.

10. The method for laying ultra-long-distance submarine cables according to claim 9, characterized in that, In step S1, for the offshore laying of submarine cable (2), after clamping the submarine cable (2) to the cable clamping mechanism (404) on the offshore working vessel (3), the relay power device and the submarine cable (2) are hoisted together to the designated seabed installation point using hoisting equipment, and the anchoring leg (407) is firmly inserted into the seabed through vibration construction; for the island laying of submarine cable (2), the relay power device is first firmly installed at the designated installation point on the island side, and then the submarine cable (2) is hoisted into place and clamped.

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