A marine wind power submarine cable joint protection stabilizing device

Abstract

The present application belongs to the offshore wind power technical field, disclose a kind of offshore wind power submarine cable joint protection stabilizing device, including joint pipe, external submarine cable positioning structure and internal submarine cable positioning structure;Joint pipe is set through single-pile foundation side wall;External submarine cable positioning structure is used to support and position submarine cable overhanging section, including hydraulic cylinder, ∠type support and expansion support bag, one end of ∠type support is hinged to single-pile foundation outer wall and is driven adjustment posture by hydraulic cylinder;Expansion support bag is arranged along inclined rod upper surface and horizontal rod lower surface;By injecting concrete slurry into expansion support bag to swell to wrap submarine cable and ∠type support;Internal submarine cable positioning structure is set in single-pile foundation cavity.The advantage of the present application is: through ∠type support and hydraulic cylinder, the water entry angle and posture of submarine cable overhanging section can be actively adjusted;Expansion support bag injected with concrete slurry can not only wrap and protect submarine cable, but also be stably supported on seabed, forming long-term stable support foundation.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power technology, specifically relating to a protection and stabilization device for offshore wind power submarine cable joints. Background Technology

[0002] Offshore wind power, as an important component of renewable energy, has experienced rapid development globally in recent years. Offshore wind power installations mainly include wind turbine generators, support foundations, submarine cables, and supporting facilities such as substations. Among these, the support foundation is the key structure that determines whether the wind turbine generator can operate stably.

[0003] Currently, offshore wind turbine foundations are mainly classified into two categories based on their structural form: fixed foundations and floating foundations. Fixed foundations include monopile foundations, tripod foundations, jacket foundations, gravity foundations, etc., and are generally suitable for shallow nearshore waters with a water depth of less than 50m. Floating foundations include semi-submersible foundations, tension leg foundations, and column foundations, and are more suitable for deep-sea areas with a water depth of more than 50m. As offshore wind power development gradually extends to deeper and more distant waters, the application of floating foundations is increasing, and the requirements for cable connections and protection are becoming more complex.

[0004] Submarine cables (hereinafter referred to as "submarine cables") are crucial channels for power transmission and communication signal transmission in offshore wind farms, undertaking the important task of collecting the electrical energy generated by wind turbines and transmitting it to the onshore power grid. Submarine cables typically use cross-linked polyethylene (XLPE) insulated submarine cables, with a cross-section containing a water-blocking conductor, insulation layer, shielding layer, armor layer, and optical fiber units, requiring special performance characteristics such as anti-interference and corrosion resistance. During the laying and operation of submarine cables, it is necessary to minimize the number of joints. The entire submarine cable can be approximately 50 km long and weigh approximately 5000 tons.

[0005] In offshore wind power installations with fixed foundations, the connection between the submarine cable and the wind turbine is primarily achieved through a connector pipe or I-tube. The connector pipe is typically welded to the outer wall of the wind turbine monopile foundation or embedded within the jacket foundation. Its lower end is curved and open. During cable laying, the cable enters from the upper end of the connector pipe, extends along the curved path of the pipe from the lower end, and then extends to the seabed laying area. Therefore, the connection point between the submarine cable and the wind turbine monopile foundation—specifically, the section of the cable suspended between the lower end of the connector pipe and the seabed—is a critical stress point in the entire connection system. This suspended section between the bottom of the connector pipe and the seabed is the weakest link in the cable protection.

[0006] In a dynamic marine environment, the submarine cable at the flared end of the connector pipe (i.e., the connection joint between the submarine cable and the wind turbine monopile foundation) is in a suspended state for extended periods, making it highly susceptible to excessive bending and continuous collisions and friction at the flared end of the connector pipe, leading to mechanical damage and even fatigue fracture. Furthermore, the long-term scouring action of ocean currents easily creates scour pits around the wind turbine foundation, continuously increasing the length of the suspended section of the submarine cable and exacerbating the stress on it. Engineering case studies have shown that, influenced by external forces such as tides and swells, prolonged seawater erosion of the soil around the wind turbine pipe causes scour collapse zones near the pipe, resulting in slight changes in the cable's burial route, leading to suspension and tension, mechanical damage to the cable itself, and impaired local electrical performance.

[0007] Therefore, there is an urgent need to provide a protection and stabilization device for offshore wind power cable joints to overcome the shortcomings of existing technologies. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of the prior art by providing a protective and stabilizing device for offshore wind power cable joints. This device provides dual positioning and support for the cable at the joint pipe within the monopile foundation and the suspended section of the cable, effectively preventing mechanical damage to the cable caused by suspension, bending, and scouring, and significantly improving the long-term stability and safety of the joint location.

[0009] The objective of this invention is achieved through the following technical solutions: A protective and stabilizing device for a submarine cable joint in offshore wind power is disclosed, relating to the connection joint position between the submarine cable and the monopile foundation of the offshore wind turbine. The joint protection and stabilizing device includes a joint pipe, an external submarine cable positioning structure, and an internal submarine cable positioning structure. The joint pipe includes a joint pipe body and an upper flared opening and a lower flared opening located at both ends of the joint pipe body, and the joint pipe body is installed through the side wall of the monopile foundation. The external submarine cable positioning structure is used to support and position the suspended section of the submarine cable extending obliquely downward from the joint pipe. The external submarine cable positioning structure includes a hydraulic cylinder, a "∠" shaped bracket, and an expansion support bag. The "∠" shaped bracket includes an inclined rod and a horizontal rod. One end of the horizontal rod is hinged to the outer wall of the monopile foundation, and the inclined rod is fixedly installed on the other end of the horizontal rod. The inclined rod and the horizontal rod are set at an inclined angle. One end of the hydraulic cylinder is temporarily hinged to the outer wall of the monopile foundation, and the other end of the hydraulic cylinder is temporarily hinged to the horizontal rod. The expansion support bag is arranged along the upper surface of the inclined rod and the lower surface of the horizontal rod. The posture of the suspended section of the submarine cable is adjusted by driving the hydraulic cylinder to extend and retract. After the desired posture is achieved, concrete grout is injected into the expansion support bag. The expansion support bag located on the upper surface of the inclined rod expands and wraps around and adheres to the outer wall of the submarine cable. The expansion support bag located on the lower surface of the horizontal rod expands so that its lower surface adheres to the seabed. The internal submarine cable positioning structure is located within the cavity of the monopile foundation and includes a circumferential expansion support bag and an automatic grouting mechanism fixed to the inner wall of the monopile foundation.

[0010] The connector pipe includes a first pipe section that slopes downwards and a second pipe section that slopes upwards. The upper flared end is located inside the cavity of the monopile foundation and faces upwards vertically, while the lower flared end is located outside the side wall of the monopile foundation and faces downwards.

[0011] The circumferential expansion support bag is attached to the inner wall of the monopile foundation and located above the upper flared opening. The grouting port on the circumferential expansion support bag is connected to the automatic grouting mechanism. The automatic grouting mechanism includes a polyurethane foam storage tank and a dual-liquid grouting pump. By controlling the dual-liquid grouting pump, the polyurethane foam raw material in the polyurethane foam storage tank is pumped into the circumferential expansion support bag to undergo a mixing reaction and expansion, thereby limiting the wrapping of the submarine cable.

[0012] The inclined rod and the horizontal rod are provided with a number of pre-set insertion holes, and the corresponding mounting surface of the expansion support bag is provided with a number of pre-set rubber plugs. The rubber plugs are mushroom-shaped. The expansion support bag is connected to the inclined rod and the horizontal rod by inserting the corresponding rubber plugs into the pre-set insertion holes. After the hydraulic cylinder drives the "∠" shaped bracket to complete the attitude adjustment of the suspended section of the submarine cable, the expansion support bag is temporarily bonded to the surface of the submarine cable by a point-interval pasting method so that the expansion support bag wraps the submarine cable in a semi-circular arc shape.

[0013] The cross-section of the diagonal rod is in the shape of a circular arc groove to achieve a close fit and support for the submarine cable.

[0014] A limiting and fixing sleeve is provided at the junction where the submarine cable extends into the seabed. The limiting and fixing sleeve consists of two semi-circular limiting parts that are fastened to the submarine cable.

[0015] The advantages of this invention are: (1) Through the “∠” type bracket and hydraulic cylinder in the external submarine cable positioning structure, the water entry angle and attitude of the suspended section of the submarine cable can be actively adjusted to avoid excessive bending or fatigue damage of the submarine cable at the flared end of the joint pipe. (2) The expansion support bag can be simultaneously contacted and positioned with the submarine cable along with the “∠” shaped bracket. By injecting concrete grout into the expansion support bag, a rigid solidification connection is achieved between the bracket and the submarine cable, and between the bracket and the seabed after the “∠” shaped bracket is adjusted into place. The expanded support bag can not only wrap and protect the submarine cable, but also stably support it on the seabed, forming a long-term stable support foundation. Compared with the traditional support frame, grouting after attaching to the submarine cable can provide complete support for the submarine cable and achieve a more stable support effect. (3) The internal submarine cable positioning structure utilizes the principle of polyurethane foam expansion to form a circumferential wrapping and effective restraint of the submarine cable within the cavity of the monopile foundation, which can achieve stable support for the attitude of the submarine cable and prevent the submarine cable from swaying or colliding and abrading with the inner wall of the monopile foundation. (4) The expansion support bag and the “∠” type bracket adopt a mushroom-shaped rubber plug quick connection method, which is convenient for positioning and adjustment before construction; the temporary bonding method can enable the expansion support bag to obtain the initial arrangement posture, ensuring that the expansion support bag can accurately wrap the submarine cable during the grouting expansion process, and obtain the required shape of concrete support body to achieve stable support. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the initial installation of the offshore wind power submarine cable joint protection and stabilization device in this invention; Figure 2 This is a schematic diagram illustrating the adjustment of the attitude of the suspended section of the submarine cable by the protection and stabilization device for the offshore wind power cable joint in this invention. Figure 3 This is a schematic diagram of the grouting process completed by the offshore wind power submarine cable joint protection and stabilization device in this invention; Figure 4 This is a schematic diagram of the cross-section of the submarine cable installed on the diagonal rod in this invention; Figure 5 This is a schematic diagram of the cross-section of the submarine cable supported by the expansion support bag on the inclined rod after grouting is completed in this invention; Figure 6 For the present invention Figure 3 A magnified view of part A in the diagram; like Figure 1-6The markings in the diagram are as follows: 1. Monopile foundation; 2. Submarine cable; 3. Joint pipe; 31. Lower flared end; 32. Upper flared end; 33. Pipe body; 4. External submarine cable positioning structure; 41. Diagonal rod; 42. Hydraulic cylinder; 43. Horizontal rod; 44. Expansion support bag; 45. Concrete support body; 46. Rubber plug; 47. One-way grouting valve; 48. Adhesive sheet; 5. Internal submarine cable positioning structure; 51. Circumferential expansion support bag; 52. Dual-liquid grouting pump; 53. Polyurethane foam storage tank; 6. Limiting and fixing sleeve. Detailed Implementation

[0017] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: Example: Figures 1 to 6 As shown, this embodiment specifically relates to a protection and stabilization device for a submarine cable joint in offshore wind power. The device is installed on the monopile foundation 1 of the offshore wind turbine and is used to protect and stabilize the joint between the submarine cable 2 and the monopile foundation 1.

[0018] like Figures 1 to 6 As shown, the monopile foundation 1 is a cylindrical steel structure, with its lower end driven below the seabed and its upper end protruding above the water surface and connected to the wind turbine tower. The submarine cable 2 extends from the seabed to the vicinity of the monopile foundation 1, passes through a connector pipe 3 into the internal cavity of the monopile foundation 1, and finally connects to the internal electrical equipment of the wind turbine. The connector protection and stabilization device in this embodiment mainly includes three parts: the connector pipe 3, the external submarine cable positioning structure 4, and the internal submarine cable positioning structure 5.

[0019] like Figure 1 , 2 As shown in Figures 3 and 6, the connector pipe 3 is welded and fixed to the side wall of the monopile foundation 1, and its body 33 penetrates the side wall of the monopile foundation 1. The body 33 includes two pipe sections: the first pipe section runs obliquely downward, and the second pipe section runs vertically upward. An arc transition is used between the first and second pipe sections to guide the submarine cable 2 and control its bending degree. The lower end of the first pipe section is connected to a lower flared end 31, which is located on the outer side of the outer wall of the monopile foundation 1 and runs obliquely downward; the upper end of the second pipe section is connected to an upper flared end 32, which is located inside the cavity of the monopile foundation 1 and runs vertically upward. This structure facilitates the submarine cable 2 to enter the monopile foundation 1 obliquely upward from the seabed and then turn to run vertically upward. The submarine cable 2 passes through the connector pipe 3 from the lower flared end 31 and runs out from the upper flared end 32 along the path of the body 33. The submarine cable 2 forms a suspended section between the lower funnel 31 outlet and the seabed surface, which is the key protected part of this embodiment.

[0020] like Figure 1 , 2As shown in Figure 3, the external submarine cable positioning structure 4 is used to support and position the suspended section of the submarine cable 2. It includes a hydraulic cylinder 42, a "∠"-shaped bracket, and an expansion support bag 44. The "∠"-shaped bracket is formed by a fixed connection between a diagonal rod 41 and a horizontal rod 43. One end of the horizontal rod 43 is hinged to the outer wall of the monopile foundation 1 via a hinge seat and can rotate around the hinge point; the other end of the horizontal rod 43 is fixedly connected to the lower end of the diagonal rod 41, which extends upward at an angle. The angle between the diagonal rod 41 and the horizontal rod 43 is preset according to the designed water entry angle of the submarine cable 2. One end of the hydraulic cylinder 42 is temporarily hinged to the outer wall of the monopile foundation 1, and the other end is temporarily hinged to the middle of the horizontal rod 43. By controlling the extension and retraction of the hydraulic cylinder 42, the "∠"-shaped bracket can be driven to rotate around the hinge point of the horizontal bar 43, thereby adjusting the tilt angle of the inclined bar 41, and thus adjusting the water entry posture and curvature of the suspended section of the submarine cable 2, preventing excessive bending or friction and collision between the submarine cable 2 and the pipe opening at the lower flared end 31. The expansion support bag 44 is made of high-strength flexible fiber-reinforced composite material, which is impermeable and expandable. The volume of the expansion support bag 44 corresponds to the volume of the required concrete support 45. The expansion support bag 44 is arranged in two parts: one part is laid along the upper surface of the inclined bar 41, and the other part is laid along the lower surface of the horizontal bar 43. The two parts are interconnected as a whole. The expansion support bag 44 is equipped with a one-way grouting valve 47 for connecting with external concrete grouting equipment. It should be noted that the purpose of the temporary hinge at both ends of the hydraulic cylinder 42 is to make it detachable, that is, after the concrete support 45 is poured and solidified, the hydraulic cylinder 42 can be removed and recycled.

[0021] like Figure 4 and 5 As shown, the cross-section of the diagonal rod 41 is an arc-shaped groove, with its radius slightly larger than the outer diameter of the submarine cable 2, to fit and support the outer wall of the submarine cable 2. Several spaced insertion holes are pre-set on the diagonal rod 41 and the horizontal rod 43. Several rubber plugs 46 are pre-set on the mounting surface corresponding to the expansion support bag 44. The rubber plugs 46 have a mushroom-shaped structure, and the outer diameter of the mushroom-shaped end of the rubber plug 46 is slightly larger than the diameter of the insertion hole. During installation, the rubber plugs 46 are inserted into the corresponding insertion holes of the diagonal rod 41 and the horizontal rod 43 to achieve quick positioning and connection between the expansion support bag 44 and the "∠"-shaped bracket. After the hydraulic cylinder 42 completes the posture adjustment of the "∠"-shaped bracket, the expansion support bag 44 located on the upper surface of the diagonal rod 41 is temporarily bonded to the two sides of the submarine cable 2 using adhesive pieces 48, so that the expansion support bag 44 wraps the submarine cable 2 in a semi-circular arc shape, maintaining a basic initial posture so that it can accurately wrap the submarine cable 2 according to the preset shape during subsequent grouting expansion.

[0022] like Figure 1 , 2As shown in Figures 3 and 6, the internal submarine cable positioning structure 5 is installed within the cavity of the monopile foundation 1, including a circumferential expansion support bag 51 and an automatic grouting mechanism. The circumferential expansion support bag 51 is attached to the inner wall of the monopile foundation 1, located above the upper flared end 32. The circumferential expansion support bag 51 is annular in shape, and its inner cavity is connected to the automatic grouting mechanism through a grouting port. The automatic grouting mechanism includes a polyurethane foam storage tank 53 and a dual-liquid grouting pump 52. The polyurethane foam storage tank 53 stores the A-component raw material and the B-component raw material of the polyurethane foam, respectively. The A-component raw material is polyisocyanate, and the B-component raw material is a composite polyether (containing polyol, foaming agent, catalyst, etc.). When the submarine cable 2 is led out from the upper flared end 32 and the internal wiring is completed, the dual-liquid grouting pump 52 is started to pump the A and B component raw materials into the circumferential expansion support bag 51 in proportion. The two components mix and react inside the bag, rapidly foaming and expanding, causing the circumferential expansion support bag 51 to squeeze inward and tightly wrap the submarine cable 2, forming a flexible limiting ring to prevent the submarine cable 2 from shaking or colliding and abrading with the inner wall inside the monopile foundation 1.

[0023] like Figures 1 to 6 As shown, the installation method of the offshore wind power submarine cable joint protection and stabilization device in this embodiment includes the following steps: (S1) After the construction of the monopile foundation 1 is completed and before the submarine cable 2 is laid, the joint pipe 3 is pre-welded to the designated position on the side wall of the monopile foundation 1.

[0024] (S2) Pre-assemble the components of the external submarine cable positioning structure 4 on the shore or on the construction vessel: Hinge the horizontal bar 43 to the outer wall of the monopile foundation 1, temporarily hinge the two ends of the hydraulic cylinder 42 to the monopile foundation 1 and the horizontal bar 43 respectively, and install the expansion support bag 44 on the upper surface of the inclined bar 41 and the lower surface of the horizontal bar 43 through the rubber plug 46.

[0025] (S3) When laying the submarine cable 2, it is inserted from the lower flared end 31, led out from the upper flared end 32 through the connector pipe 3, and a sufficient length is reserved.

[0026] (S4) For example Figure 2 As shown, the hydraulic cylinder 42 is driven to extend and retract by the hydraulic control system, which drives the "∠" shaped bracket to rotate slowly, so that the inclined bar 41 gradually fits the lower surface of the suspended section of the submarine cable 2. At the same time, the bending state of the submarine cable 2 is observed until the designed water entry angle and bending curvature requirements are met.

[0027] (S5) After the attitude of the suspended section of the submarine cable 2 is adjusted to the correct position, the expansion support bag 44 is temporarily fixed to the surface of the submarine cable 2 using the adhesive sheet 48.

[0028] (S6) Connect the concrete grout delivery pipe to the one-way grouting valve 47, and inject high-flowability underwater non-dispersible concrete grout into the expansion support bag 44. As the grout is injected, the expansion support bag 44 located on the upper surface of the inclined rod 41 expands and tightly wraps around the outer wall of the submarine cable 2, while the expansion support bag 44 located on the lower surface of the horizontal rod 43 expands and adheres downwards to the seabed surface, as... Figure 3 As shown, the concrete support 45 formed after grouting inside the expansion support bag 44 also has an overall "∠" shape. (S7) After the concrete grout has solidified, the expansion support bag 44 forms a rigid concrete support body 45. The concrete support body 45 on the diagonal rod 41 securely wraps the suspended section of the submarine cable 2. The concrete support body 45 below the horizontal rod 43 forms a stable support foundation with the seabed surface. The concrete support body 45 is also shaped like a "∠", which on the one hand provides a certain amount of gravity to ensure stability and is not easily affected by ocean currents; on the other hand, the concrete and the "∠" shaped bracket can be combined to form a structure with high rigidity. At this time, the hydraulic cylinder 42 can be removed, recycled, and reused.

[0029] (S8) In the cavity of the single pile foundation 1, start the double liquid grouting pump 52 to inject grout into the circumferential expansion support bag 51. After the polyurethane foam expands, it wraps around the limiting submarine cable 2 to form an effective limit.

[0030] (S9) In addition, such as Figure 3 As shown, a limiting and fixing sleeve 6 can be added at the junction where the submarine cable 2 extends into the seabed. The limiting and fixing sleeve 6 consists of two semi-circular limiting parts that are fastened to the submarine cable 2 by bolts. Its lower end is inserted into the seabed surface to a certain depth to prevent the submarine cable 2 from shifting due to seabed erosion.

[0031] The beneficial effects of this embodiment are: (1) Through the “∠” type bracket and hydraulic cylinder in the external submarine cable positioning structure, the water entry angle and attitude of the suspended section of the submarine cable can be actively adjusted to avoid excessive bending or fatigue damage of the submarine cable at the flared end of the joint pipe. (2) The expansion support bag can be in contact with and positioned with the submarine cable simultaneously with the “∠” type bracket. By injecting concrete grout into the expansion support bag, a rigid solidification connection between the bracket and the submarine cable, and between the bracket and the seabed can be achieved after the “∠” type bracket is adjusted into place. The expanded support bag can not only wrap and protect the submarine cable, but also stably support the seabed, forming a long-term stable support foundation. (3) The internal submarine cable positioning structure utilizes the principle of polyurethane foam expansion to form a circumferential wrapping and effective restraint of the submarine cable within the cavity of the monopile foundation, which can achieve stable support for the attitude of the submarine cable and prevent the submarine cable from swaying or colliding and abrading with the inner wall of the monopile foundation. (4) The expansion support bag and the “∠” type bracket adopt a mushroom-shaped rubber plug quick connection method, which is convenient for positioning and adjustment before construction; the temporary bonding method can enable the expansion support bag to obtain the initial arrangement posture, ensuring that the expansion support bag can accurately wrap the submarine cable during the grouting expansion process, and obtain the required shape of concrete support body to achieve stable support.

Claims

1. A protective and stabilizing device for a submarine cable joint in offshore wind power, relating to the connection joint location between the submarine cable and the monopile foundation of the offshore wind turbine, characterized in that... The joint protection and stabilization device includes a joint tube, an external submarine cable positioning structure, and an internal submarine cable positioning structure. The joint pipe includes a joint pipe body and an upper flared opening and a lower flared opening located at both ends of the joint pipe body, and the joint pipe body is installed through the side wall of the monopile foundation. The external submarine cable positioning structure is used to support and position the suspended section of the submarine cable extending obliquely downward from the joint pipe. The external submarine cable positioning structure includes a hydraulic cylinder, a "∠" shaped bracket, and an expansion support bag. The "∠" shaped bracket includes an inclined rod and a horizontal rod. One end of the horizontal rod is hinged to the outer wall of the monopile foundation, and the inclined rod is fixedly installed on the other end of the horizontal rod. The inclined rod and the horizontal rod are set at an inclined angle. One end of the hydraulic cylinder is temporarily hinged to the outer wall of the monopile foundation, and the other end of the hydraulic cylinder is temporarily hinged to the horizontal rod. The expansion support bag is arranged along the upper surface of the inclined rod and the lower surface of the horizontal rod. The posture of the suspended section of the submarine cable is adjusted by driving the hydraulic cylinder to extend and retract. After the desired posture is achieved, concrete grout is injected into the expansion support bag. The expansion support bag located on the upper surface of the inclined rod expands and wraps around and adheres to the outer wall of the submarine cable. The expansion support bag located on the lower surface of the horizontal rod expands so that its lower surface adheres to the seabed. The internal submarine cable positioning structure is located within the cavity of the monopile foundation and includes a circumferential expansion support bag and an automatic grouting mechanism fixed to the inner wall of the monopile foundation.

2. The offshore wind power submarine cable joint protection and stabilization device according to claim 1, characterized in that... The connector pipe includes a first pipe section that slopes downwards and a second pipe section that slopes upwards. The upper flared end is located inside the cavity of the monopile foundation and faces upwards vertically, while the lower flared end is located outside the side wall of the monopile foundation and faces downwards.

3. The offshore wind power submarine cable joint protection and stabilization device according to claim 2, characterized in that... The circumferential expansion support bag is attached to the inner wall of the monopile foundation and located above the upper flared opening. The grouting port on the circumferential expansion support bag is connected to the automatic grouting mechanism. The automatic grouting mechanism includes a polyurethane foam storage tank and a dual-liquid grouting pump. By controlling the dual-liquid grouting pump, the polyurethane foam raw material in the polyurethane foam storage tank is pumped into the circumferential expansion support bag to undergo a mixing reaction and expansion, thereby limiting the wrapping of the submarine cable.

4. The offshore wind power submarine cable joint protection and stabilization device according to claim 1, characterized in that... The inclined rod and the horizontal rod are provided with a number of insertion holes. The corresponding mounting surface of the expansion support bag is provided with a number of rubber plugs. The rubber plugs are mushroom-shaped. The expansion support bag is connected to the inclined rod and the horizontal rod by inserting the rubber plugs on the expansion support bag into the corresponding insertion holes. After the hydraulic cylinder drives the "∠" shaped bracket to complete the attitude adjustment of the suspended section of the submarine cable, the expansion support bag is temporarily bonded to the surface of the submarine cable using a point-interval bonding method, so that the expansion support bag wraps the submarine cable in a semi-circular arc shape.

5. The offshore wind power submarine cable joint protection and stabilization device according to claim 1, characterized in that... The cross-section of the diagonal rod is in the shape of a circular arc groove to achieve a close fit and support for the submarine cable.

6. The offshore wind power submarine cable joint protection and stabilization device according to claim 1, characterized in that... A limiting and fixing sleeve is provided at the junction where the submarine cable extends into the seabed. The limiting and fixing sleeve consists of two semi-circular limiting parts that are fastened to the submarine cable.

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