Offshore wind power suction pile foundation submarine cable protection pipe

Abstract

The utility model relates to a kind of offshore wind power suction pile foundation submarine cable protection pipe;Including suction pile body, suction pile connecting section, guide pipe support main leg, diagonal brace, transition section, main steel pipe, upper section submarine cable pipe, lower section submarine cable pipe, horn mouth, sealing plate, submarine cable pipe support, water filling hole, exhaust pipe, exhaust pipe support etc.。By setting upper and lower section submarine cable protection pipe in guide pipe support main leg inside, make full use of main leg internal space, avoid mutual conflict with additional current protection system and other accessory components;And upper section submarine cable protection pipe is set in main leg inside, can increase submarine cable pipe bending radius, be favorable to submarine cable threading.Carry out upper section submarine cable pipe to below splash zone and close upper guide pipe support main leg, effectively avoid the corrosion problem of splash zone main guide pipe inner wall.Simultaneously compared with full-length submarine cable pipe has the advantage of steel saving, project cost bottom.In addition, the upper horn mouth of lower section submarine cable pipe is extended to the form of guide pipe support main leg inside, which is convenient for cable traction rope threading.

Description

Technical Field

[0001] This utility model relates to the field of offshore wind power facility structure technology, and in particular to a submarine cable protection pipe for offshore wind power suction pile foundation. Background Technology

[0002] The substructure of an offshore wind farm is a crucial component. Commonly used foundation types include monopile foundations, high-pile cap foundations, pile jacket foundations, and suction pile foundations. Among these, suction pile foundations offer advantages such as no need for rock embedding, convenient construction and installation, and low cost, and are currently widely used in several offshore wind farms. Submarine cable protection pipes are an important auxiliary component of suction pile foundations. Submarine cables need to pass through the cable protection pipes attached to the suction pile foundation to enter the upper wind turbine tower and connect with the wind turbine cables to ensure the smooth transmission of electricity generated by the generator. Common types of submarine cable protection pipes used in actual engineering include... Figure 1 As shown, the submarine cable conduit A1 is located outside the main leg A2 of the jacket structure, running the entire length of the jacket structure from bottom to top. Supports A3 are installed at intervals, securing the conduit to the main leg (where A4 is a transition section and A5 is the main steel pipe). The advantage of this type of submarine cable protection conduit is that the interior of the main leg A2 is a closed space, eliminating corrosion issues, and the buoyancy of each main pipe is basically the same. However, its length is relatively long, requiring a higher amount of steel, and the number of supports is also greater, resulting in poor economic efficiency when there are many submarine cable conduits. In addition, segmented submarine cable protection conduits, such as... Figure 2 As shown, this type of submarine cable conduit is divided into upper and lower sections (A6 and A7), with the main leg of the jacket structure between the upper and lower sections considered as the "intermediate section." Compared to a continuous type, the segmented submarine cable conduit is significantly shorter, thus saving steel and reducing construction costs. However, seawater enters the main leg A2 of the jacket structure along the bottom flared opening of the lower section, causing corrosion on the inner wall of the main leg, especially in the splash zone. Anti-corrosion measures are required for the inner wall of the main leg; however, due to the limited internal space of the main leg, anti-corrosion construction is difficult, increasing costs, sometimes exceeding the savings in cable conduit material costs. Furthermore, placing the cable conduit on the outside of the main leg occupies usable space, significantly impacting the layout of other auxiliary components such as the impressed current protection system. Figure 2 The segmented submarine cable conduit shown has a small bending radius at the connection points with the main legs of the jacket foundation and at the junction with the main steel pipe of the transition section, making it difficult to thread the submarine cable. Furthermore, the main legs with segmented cable conduits are filled with water, resulting in significantly less buoyancy from the seawater compared to those without conduits—a difference that can reach tens of tons—which is detrimental to the normal use of the foundation. Therefore, it is necessary to design a submarine cable protection conduit that uses less steel, has a reasonable structural form, and is also economically viable. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a suction pile foundation submarine cable protection pipe that uses less steel, has a reasonable structure, and is economical in engineering, so as to save engineering work and avoid corrosion damage when the main legs of the jacket are filled with water.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] This utility model discloses a submarine cable protection pipe for offshore wind power suction pile foundations. It is characterized by comprising a main leg of a jacket structure, an upper submarine cable protection pipe, a No. 1 flared end, a No. 3 flared end, and a lower submarine cable protection pipe. The upper submarine cable protection pipe is fixed to the inner wall of the main leg of the jacket structure, with its upper end passing through a transition section and extending into the main steel pipe. The lower end of the upper submarine cable protection pipe is connected to the No. 1 flared end and extends below the splash zone and into the fully immersed zone. A No. 1 annular sealing plate is welded to the end of the No. 1 flared end, sealing the interior of the main leg of the jacket structure above the No. 1 flared end. A lower partial section of the lower submarine cable protection pipe is fixed to the top of the suction pile connection section. The lower end of the lower submarine cable protection pipe is connected to the No. 2 flared end, and the upper end of the lower submarine cable protection pipe extends into the main leg of the jacket structure and is connected to the No. 3 flared end. The port of the No. 3 flared end, on the side away from the lower submarine cable protection pipe, extends to the inner wall of the main leg of the jacket structure for welding.

[0006] The lower end of the main leg of the jacket is connected to the upper part of the suction pile body. The suction pile body is a cylindrical or polygonal column with an open lower end and a closed upper end. There may be one or more suction pile bodies. Connecting components may or may not be provided between the multiple suction pile bodies. The distances between the multiple suction pile bodies and the center of the foundation may be exactly the same or different. The suction pile connecting section is located at the top of the suction pile body and on the outer periphery of the lower end of the main leg of the jacket.

[0007] The main legs of the jacket are circular cross-section steel pipes, and the number of main legs of the jacket is three or more.

[0008] Diagonal braces are provided in the plane where two adjacent main legs of the jacket are located. The diagonal braces are circular cross-section steel pipes with a diameter smaller than the cross-sectional diameter of the main legs of the jacket. The diagonal braces are arranged in layers and crosswise along the height direction of the main legs of the jacket. The main legs of the jacket and the diagonal braces together constitute the main structure of the jacket.

[0009] The transition section is located at the upper end of the jacket and connected to both sides of the middle main steel pipe; the upper part of the main steel pipe is connected to the wind turbine tower.

[0010] The upper section of the submarine cable protection pipe is fixed to the inner wall of the main leg of the guide frame by the submarine cable pipe support. The lower part of the lower section of the submarine cable protection pipe is fixed to the top of the suction pile connection section by the submarine cable pipe support. The submarine cable pipe support includes a sleeve for mounting and fixing the submarine cable protection pipe and a supporting steel pipe. One end of the supporting steel pipe is welded to the sleeve, and the other end is fixed to the top plate of the suction pile connection section or the inner wall of the main leg of the guide frame.

[0011] The wall surface of the No. 3 horn opening is provided with water-permeable holes.

[0012] The lower part of the main leg of the jacket has a circular column. The lower end of the circular column is fixedly connected to the upper end face of the suction pile body. Multiple suction pile connecting sections are provided on the upper end face of the suction pile body and around the circular column. A circular steel pipe is provided on the circular column. The through hole of the circular steel pipe forms a water filling hole for connecting the inside and outside of the main leg of the jacket.

[0013] An exhaust pipe is fixedly installed on the inner wall of the main leg of the jacket. The upper end of the exhaust pipe extends into the external space through the transition section, and the lower part of the exhaust pipe passes through the splash zone and extends into the full immersion zone. A No. 2 annular sealing plate is installed at the lower end of the exhaust pipe, which seals the interior of the main leg of the jacket above the No. 2 annular sealing plate.

[0014] The exhaust pipe is fixed to the inner wall of the main leg of the guide frame by an exhaust pipe support. One end of the exhaust pipe support is welded to the exhaust pipe, and the other end of the exhaust pipe support is welded to the inner wall of the main leg of the guide frame.

[0015] The beneficial effects of this utility model are as follows: The novel segmented submarine cable protection pipe structure provided by this utility model fully utilizes the internal space of the main legs of the jacket foundation by placing the upper and lower segments of the submarine cable protection pipe inside, avoiding conflicts with auxiliary components such as the impressed current protection system. Furthermore, placing the upper segment of the submarine cable protection pipe inside the main leg increases the bending radius of the cable pipe, which is beneficial for cable threading. Extending the upper segment of the cable pipe below the splash zone and sealing the upper main leg of the jacket foundation effectively avoids corrosion of the inner wall of the main pipe in the splash zone. Compared with a continuous submarine cable pipe, it has the advantages of saving steel and lower engineering cost. In addition, extending the upper flared end of the lower segment of the cable pipe into the main leg of the jacket foundation facilitates the threading of the cable traction rope. The segmented submarine cable protection pipe provided by this utility model, combined with water filling holes and vent pipes, further ensures that the water filling state inside each main leg of the jacket foundation is consistent, and the buoyancy force is similar, thus improving the pull-out bearing capacity of the suction pile foundation. Attached Figure Description

[0016] Figure 1 A schematic diagram of a full-length submarine cable protection pipe in the existing technology;

[0017] Figure 2 This is a schematic diagram of a segmented submarine cable protection pipe structure in the existing technology.

[0018] Figure 3 This is a three-dimensional schematic diagram of a submarine cable protection pipe for an offshore wind power suction pile foundation, which is a specific embodiment of this utility model.

[0019] Figure 4 for Figure 3 A partial view;

[0020] Figure 5 for Figure 3 A partial view;

[0021] Figure 6 This is an overall layout diagram of the submarine cable protection pipe for an offshore wind power suction pile foundation, which is a specific embodiment of this utility model.

[0022] Figure 7 Detailed diagram of the No. 1 flared opening structure of a submarine cable protection pipe for offshore wind power suction pile foundation, which is a specific embodiment of this utility model;

[0023] Figure 8 Detailed diagram of the No. 3 flared opening structure of a submarine cable protection pipe for offshore wind power suction pile foundation, which is a specific embodiment of this utility model;

[0024] Figure 9 for Figure 8 A three-dimensional view of the No. 3 horn-shaped opening in the center;

[0025] Figure 10 This is a detailed structural diagram of the exhaust pipe for the submarine cable protection pipe of an offshore wind power suction pile foundation, which is a specific embodiment of this utility model.

[0026] Label Explanation:

[0027] 1. Suction pile body; 2. Suction pile connecting section; 3. Main leg of the guide frame; 4. Diagonal brace; 5. Transition section; 6. Main steel pipe; 7. Upper section of submarine cable protection pipe; 8-1, No. 1 bell mouth; 8-2, No. 2 bell mouth; 8-3, No. 3 bell mouth; 9. Lower section of submarine cable protection pipe; 10. Submarine cable pipe support; 11-1, No. 1 sealing plate; 11-2, No. 2 annular sealing plate; 12. Water filling hole; 13. Vent pipe; 14. Vent pipe support; 15. Water permeable hole; 16. Circular column. Detailed Implementation

[0028] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0029] Please refer to Figures 3-10This utility model relates to a submarine cable protection pipe for offshore wind power suction pile foundation, including suction pile body 1, suction pile connecting section 2, main leg of jacket frame 3, diagonal brace 4, transition section 5, main steel pipe 6, upper section submarine cable protection pipe 7, No. 1 flared mouth 8-1, No. 2 flared mouth 8-2, No. 3 flared mouth 8-3, lower section submarine cable protection pipe 9, submarine cable pipe support 10, No. 1 sealing plate 11-1, No. 2 annular sealing plate 11-2, water filling hole 12, vent pipe 13, vent pipe support 14, water permeable hole 15, and circular column 16.

[0030] The suction pile body 1 is shaped as a cylinder or polygonal cylinder with an open bottom and a closed top. The suction pile body 1 can be single or multiple. Connecting components may or may not be provided between multiple suction pile bodies 1. The distances between multiple suction pile bodies 1 and the center of the foundation may be exactly the same or different.

[0031] Furthermore, in the aforementioned submarine cable protection pipe for offshore wind power suction pile foundations, the suction pile connection section 2 has multiple sections located at the top of the suction pile body 1. The suction pile connection section 2 connects the upper jacket structure to the suction pile body 1 as a whole, improving the connection strength between the jacket main leg 3 and the suction pile body 1. This suction pile connection section 2 can be formed by welding multiple steel plates, such as... Figure 4 As shown, the suction pile connecting section 2 has an inverted U-shaped cross section. Multiple suction pile connecting sections 2 are arranged along the circumferential direction of the lower part of the main leg 3 of the jacket frame. One side of the suction pile connecting section 2 is welded and fixed to the outer periphery of the lower part of the main leg 3 of the jacket frame, and the bottom surface of the suction pile connecting section 2 is welded and fixed to the top surface of the suction pile body 1.

[0032] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the main leg 3 of the jacket is a circular cross-section steel pipe. Depending on the type of jacket, the number of main legs 3 can be three or more.

[0033] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the diagonal brace 4 is typically a circular cross-section steel pipe with a diameter smaller than the cross-sectional diameter of the main leg 3 of the jacket. The diagonal brace 4 is installed in the plane where two adjacent main legs 3 of the jacket are located, and can be arranged in layers and crosswise along the height direction of the main legs 3 of the jacket, thereby improving the overall rigidity and load-bearing capacity of the jacket; the main legs 3 of the jacket and the diagonal brace 4 together constitute the main structure of the jacket.

[0034] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the transition section 5 is located at the upper end of the main leg 3 of the jacket frame and is connected to the middle main steel pipe 6; the transition section 5 is usually a box girder structure with corresponding space inside for the submarine cable protection pipe to pass through; the main function of the transition section 5 is to transfer the load of the upper wind turbine tower to the lower jacket frame foundation.

[0035] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the main steel pipe 6 is a large-diameter steel pipe structure, connected to the wind turbine tower at the top and connected to the transition section box girder on the side; the upper section submarine cable protection pipe 7 extends into the inner wall of the main steel pipe 6, the submarine cable passes through the upper section submarine cable protection pipe 7 and enters the main steel pipe 6, and then connects with the cable inside the wind turbine tower.

[0036] Furthermore, in the aforementioned submarine cable protection pipe for offshore wind power suction pile foundations, the upper section of the submarine cable protection pipe 7 is a thin-walled circular pipe structure, fixed to the inner wall of the main leg 3 of the jacket structure by the submarine cable pipe support 10. Its upper end passes through the transition section 5 and extends into the main steel pipe 6, while its lower end is connected to a No. 1 flared opening 8-1 and extends into the splash zone (the splash zone refers to the area located below the marine atmosphere and above the fully submerged zone, specifically ranging from 1.5 meters above the design high water level (such as the average high tide level) to 1.0 meter below), entering the fully submerged zone (the fully submerged zone refers to the area at a depth where seawater is stably covered, without periodic wet-dry alternation). The No. 1 flared opening 8-1 is a reducing steel pipe with the flared opening facing downwards; the increased diameter facilitates cable threading. A No. 1 annular sealing plate 11-1 is welded to the end of the No. 1 flared opening, sealing the interior of the main leg 3 of the jacket structure above the flared opening, allowing seawater to enter only the upper section of the submarine cable pipe 7 and preventing it from entering the main leg 3 of the jacket structure. Therefore, corrosion problems can be avoided inside the main legs of the jacket above the splash zone, and no additional anti-corrosion measures are required; while in the fully immersed zone of the main legs below the splash zone, the corrosion effect is small, and only a certain amount of steel thickness is needed to meet the anti-corrosion requirements.

[0037] Furthermore, in the aforementioned submarine cable protection pipe for offshore wind power suction pile foundations, the lower section of the submarine cable protection pipe 9 is a thin-walled circular pipe structure, fixed to the top of the suction pile connection section 2 by the submarine cable pipe support 10. The lower end of the lower section of the submarine cable protection pipe 9 is connected to a No. 2 flared opening 8-2, which extends a certain distance beyond the outer wall of the suction pile foundation to prevent the submarine cable from colliding with the suction pile connection section 2. The upper end of the lower section of the submarine cable protection pipe 9 extends into the main leg 3 of the jacket structure and is connected to a No. 3 flared opening 8-3. The submarine cable enters the main leg 3 of the jacket structure from the mud surface through the lower section of the submarine cable protection pipe 9.

[0038] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the No. 3 flared end 8-3 is located at the top of the lower section of the submarine cable pipe 9. It is also a reducing steel pipe, with the flared end of the No. 3 flared end 8-3 facing upwards, but its end diameter is larger, extending all the way to the inner wall of the main leg 3 of the guide frame, where it is welded. Before laying the cable, a traction rope needs to be installed inside the cable pipe. When threading the traction rope, a weight is usually suspended at one end, and the traction rope is lowered from the top of the upper section of the cable pipe 7. If the No. 3 flared end 8-3 adopts the type of the No. 1 flared end 8-1 with a sealing plate, the weight may get stuck at the annular sealing plate and cannot be lowered properly. Extending the No. 3 flared end to the inner wall of the main leg avoids this problem.

[0039] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the side (i.e., the wall surface) of the No. 3 horn opening 8-3 is provided with a water permeable hole 15. The water permeable hole 15 is a number of through holes or elongated holes, etc. Seawater can enter the main leg 3 of the jacket structure through the water permeable hole 15. Because when the suction pile foundation is driven in, seawater will enter the main leg 3 of the jacket structure along the lower section of the submarine cable protection pipe 9. Therefore, the No. 3 horn opening 8-3 will bear a large water pressure. After the water permeable hole is set, the seawater enters the interior of the main leg of the jacket structure below the No. 3 horn opening, which greatly reduces the water pressure borne by the horn opening. It also makes the water volume of the main leg with the submarine cable pipe basically the same as that of the main leg without the submarine cable pipe, and the buoyancy it experiences is similar.

[0040] Furthermore, in the aforementioned submarine cable protection conduit for offshore wind power suction pile foundations, the larger the radius of curvature of the cable conduit, the easier the cable threading. To maximize the radius of curvature of the cable conduit, the centerlines of the upper section 7 and the lower section 9 will be offset from the centerline of the main leg 3 of the guide frame; therefore, the No. 3 flared opening needs to be partially cut. When the centerline offset of the No. 1 flared opening is small, the No. 3 flared opening type can also be used, without the need for a ring-shaped sealing plate.

[0041] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the submarine cable pipe support 10 can be mainly divided into a sleeve and a support steel pipe. The diameter of the sleeve is slightly larger than that of the submarine cable protection pipe and is welded to the submarine cable protection pipe. One end of the support steel pipe is welded to the middle of the sleeve, and the other end is welded and fixed to the top plate of the suction pile connection section or the inner wall of the main leg of the guide frame.

[0042] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the water filling hole 12 is formed by a through hole in a circular steel pipe. The circular steel pipe is installed on the wall of the circular column 16 of the suction pile connection section 2, and the water filling hole is only set on the main leg of the jacket without the submarine cable pipe. The purpose is to allow water to be filled inside the main leg of the jacket without the submarine cable protection pipe, so that the buoyancy of the seawater on the main leg with the submarine cable protection pipe is consistent with that on the main leg with the submarine cable protection pipe, which is conducive to the normal operation of the suction pile foundation and improves the foundation pull-out bearing capacity.

[0043] Furthermore, in the aforementioned submarine cable protection pipe for offshore wind power suction pile foundations, the vent pipe 13 is a circular steel pipe with a diameter smaller than that of the submarine cable protection pipe. The upper end of the vent pipe extends into the external space through a transition section. The lower elevation of the vent pipe 13 is consistent with that of the upper submarine cable protection pipe 7, similarly passing through the splash zone and extending into the fully submerged zone. A No. 2 annular sealing plate 11-2 is installed at the lower end of the vent pipe to seal the interior of the main leg 3 of the jacket structure above it, preventing corrosion of the inner wall of the main leg. The vent pipe is fixed to the inner wall of the main leg of the jacket structure via the vent pipe support 14. The function of the vent pipe 13 is to allow the air inside the main leg of the jacket structure to be discharged to the outside of the main leg after water is filled during the sinking of the suction pile foundation, ensuring the stable sinking of the suction pile. Similarly, the upper submarine cable protection pipe 7 also serves as a vent pipe.

[0044] Furthermore, in the aforementioned offshore wind power suction pile foundation submarine cable protection pipe, the material of the exhaust pipe support 14 can be the same as that of the exhaust pipe 13. One end of the exhaust pipe support 14 is welded to the exhaust pipe, and the other end is welded to the inner wall of the main leg 3 of the jacket frame, which serves to fix the exhaust pipe.

[0045] Example 1

[0046] like Figures 3-10 As shown, it includes the suction pile body 1, suction pile connecting section 2, main leg of the guide frame 3, diagonal brace 4, transition section 5, main steel pipe 6, upper section submarine cable protection pipe 7, No. 1 flared mouth 8-1, No. 2 flared mouth 8-2, No. 3 flared mouth 8-3, lower section submarine cable protection pipe 9, submarine cable pipe support 10, No. 1 sealing plate 11-1, No. 2 annular sealing plate 11-2, water filling hole 12, vent pipe 13, vent pipe support 14, water permeable hole 15, and circular column 16.

[0047] The suction pile body 1 is a cylinder with an open bottom and a closed top, and there are three of them. No connecting components are set between the suction pile bodies, and the suction pile bodies are equidistant from the center of the foundation.

[0048] The suction pile connecting section 2 is located at the top of the suction pile body 1, and the suction pile connecting section connects the upper guide frame structure and the suction pile body into a whole. The main legs 3 of the guide frame are circular cross-section steel pipes, and the number of main guide pipes is three.

[0049] The diagonal brace 4 is a circular cross-section steel pipe with a diameter smaller than that of the main leg 3 of the jacket framework. The diagonal braces are arranged in three layers, overlapping each other, within the plane of two adjacent main legs. The main legs 3 and the diagonal braces 4 together constitute the main structure of the jacket framework.

[0050] The transition section 5 is located at the upper end of the guide frame and is connected to the middle main steel pipe 6. The transition section 5 is a box girder structure with corresponding space inside for the submarine cable protection pipe to pass through.

[0051] The main steel pipe 6 is a large-diameter steel pipe structure, connected to the wind turbine tower at the top and to the transition section 5 on the side. The upper section of the submarine cable protection pipe 7 extends into the inner wall of the main steel pipe 6, and the submarine cable passes through the submarine cable protection pipe and enters the main steel pipe, and then connects with the cable inside the wind turbine tower.

[0052] The upper section of the submarine cable protection pipe 7 is a thin-walled circular pipe structure, fixed to the inner wall of the main leg 3 of the guide frame by the submarine cable pipe support 10. The upper end of the upper section of the submarine cable protection pipe 7 passes through the transition section 5 and extends into the main steel pipe, while the lower end is connected to the No. 1 flared opening 8-1 and extends below the splash zone, entering the fully immersed zone. The flared opening is a variable diameter steel pipe, with the increased diameter to facilitate cable threading. The end of the No. 1 flared opening is welded with a No. 1 annular sealing plate 11-1, which seals the main leg 3 of the guide frame above the flared opening, allowing seawater to enter only the interior of the upper section of the submarine cable pipe and preventing it from entering the interior of the main leg.

[0053] The lower section of the submarine cable protection pipe 9 is a thin-walled circular pipe structure, fixed to the top of the suction pile connection section 2 by the submarine cable pipe support 10. The lower end of the lower section of the submarine cable protection pipe is connected to a No. 2 flared end 8-2, which extends a certain distance beyond the outer wall of the suction pile foundation to prevent collision between the submarine cable and the suction pile connection section. The upper end of the lower section of the submarine cable protection pipe 9 extends into the main leg 3 of the jacket foundation, and is connected to a No. 3 flared end 8-3 at its end. The submarine cable enters the main leg 3 of the jacket foundation from the mud surface through the lower section of the submarine cable protection pipe 9.

[0054] The No. 3 flared opening 8-3 is located at the top of the lower section of the submarine cable pipe 9. It is also a variable diameter steel pipe, but its port diameter is larger, extending all the way to the inner wall of the main leg 3 of the guide frame and being welded thereto. A water-permeable hole 15 is provided on the side of the No. 3 flared opening.

[0055] The submarine cable support 10 can be mainly divided into a sleeve and a supporting steel pipe. The diameter of the sleeve is slightly larger than that of the submarine cable protection pipe and is welded to the submarine cable protection pipe. One end of the supporting steel pipe is welded to the sleeve, and the other end is fixed to the top plate of the suction pile connection section 2 or the inner wall of the main leg 3 of the guide frame.

[0056] The water filling hole 12 is formed by the through hole of a circular steel pipe. The circular steel pipe is set on the side of the circular column 16 of the suction pile connection section 2, and the water filling hole is only set on the main leg of the guide frame where no submarine cable protection pipe is installed.

[0057] The exhaust pipe 13 is a circular steel pipe with a diameter smaller than that of the submarine cable conduit. The upper end of the exhaust pipe extends from the main steel pipe of the transition section 5 into the external space. The lower elevation of the exhaust pipe is consistent with that of the upper submarine cable protection pipe 7, and it also passes through the splash zone and extends into the fully immersed zone. A No. 2 annular sealing plate 11-2 is installed at the lower end of the exhaust pipe to seal the interior of the main leg of the guide frame above it, preventing corrosion of the inner wall of the main leg. The exhaust pipe is fixed to the inner wall of the main leg 3 by the exhaust pipe support 14.

[0058] The exhaust pipe support 14 is made of the same material as the exhaust pipe. One end is connected to the exhaust pipe 13, and the other end is welded to the inner wall of the main leg 3 of the guide frame, which serves to fix the exhaust pipe.

[0059] In summary, this utility model relates to a submarine cable protection pipe structure for offshore wind power suction pile foundations. By placing the upper and lower sections of the submarine cable protection pipe inside the main legs of the jacket foundation, it fully utilizes the internal space of the main legs and avoids conflicts with auxiliary components such as the impressed current protection system. Furthermore, placing the upper section of the submarine cable protection pipe inside the main leg increases the bending radius of the cable pipe, facilitating cable threading. Extending the upper section of the cable pipe below the splash zone and enclosing the upper jacket foundation main leg effectively prevents corrosion of the main pipe's inner wall in the splash zone. Compared to a continuous cable pipe, it has the advantages of lower steel consumption and lower project cost. Additionally, extending the upper flared end of the lower section of the cable pipe into the main legs of the jacket foundation facilitates the threading of the cable traction rope. The segmented submarine cable protection pipe provided by this utility model, combined with water filling holes and vent pipes, further ensures consistent water filling and similar buoyancy within each jacket foundation main leg, thereby improving the pull-out bearing capacity of the suction pile foundation.

[0060] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protective pipe for submarine cables of offshore wind power suction pile foundations, characterized in that, The structure includes the main leg (3) of the jacket frame, the upper section of the submarine cable protection pipe (7), the No. 1 horn (8-1), the No. 2 horn (8-2), the No. 3 horn (8-3), and the lower section of the submarine cable protection pipe (9). The upper section of the submarine cable protection pipe (7) is fixed to the inner wall of the main leg (3) of the jacket frame, and its upper end passes through the transition section (5) and extends into the main steel pipe (6). The lower end of the upper section of the submarine cable protection pipe (7) is connected to the No. 1 horn (8-1) and extends below the splash zone and into the fully immersed zone. The end of the No. 1 horn (8-1) is welded with the No. 1 annular sealing plate (11-1). ), ), No. 1 annular sealing plate (11-1) seals the inside of the main leg (3) of the guide frame above No. 1 horn mouth (8-1); the lower part of the lower section of the submarine cable protection pipe (9) is fixed to the top of the suction pile connection section (2), the lower end of the lower section of the submarine cable protection pipe (9) is connected to No. 2 horn mouth (8-2), the upper end of the lower section of the submarine cable protection pipe (9) extends into the main leg (3) of the guide frame and is connected to No. 3 horn mouth (8-3), the port of No. 3 horn mouth (8-3) on the side away from the lower section of the submarine cable protection pipe (9) extends to the inner wall of the main leg (3) of the guide frame and is welded and fixed.

2. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1, characterized in that, The lower end of the main leg (3) of the jacket is connected to the upper part of the suction pile body (1). The suction pile body (1) is a cylindrical or polygonal column with an open lower end and a closed upper end. There may be one or more suction pile bodies (1). There may be no connecting components between the multiple suction pile bodies. The distance between the multiple suction pile bodies (1) and the center of the foundation may be exactly the same or different. The suction pile connecting section (2) is located at the top of the suction pile body (1) and on the outer periphery of the lower end of the main leg (3) of the jacket.

3. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1 or 2, characterized in that, The main legs (3) of the jacket are circular cross-section steel pipes, and the number of main legs (3) of the jacket is three or more.

4. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 3, characterized in that, Diagonal braces (4) are provided in the plane where two adjacent main legs (3) of the jacket are located. The diagonal braces are steel pipes with circular cross sections. The diameter of the diagonal braces (4) is smaller than the cross section diameter of the main legs (3) of the jacket. The diagonal braces (4) are arranged in layers and cross each other along the height direction of the main legs (3) of the jacket. The main legs (3) of the jacket and the diagonal braces (4) together constitute the main structure of the jacket.

5. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 4, characterized in that, The transition section (5) is located at the upper end of the main leg (3) of the jacket and connected to both sides of the main steel pipe (6) in the middle; the upper part of the main steel pipe (6) is connected to the wind turbine tower.

6. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1, characterized in that, The upper section of the submarine cable protection pipe (7) is fixed to the inner wall of the main leg (3) of the guide frame by the submarine cable pipe support (10). The lower part of the lower section of the submarine cable protection pipe (9) is fixed to the top of the suction pile connection section (2) by the submarine cable pipe support (10). The submarine cable pipe support (10) includes a sleeve for mounting and fixing the submarine cable protection pipe and a supporting steel pipe. One end of the supporting steel pipe is welded to the sleeve, and the other end is fixed to the top plate of the suction pile connection section (2) or the inner wall of the main leg (3) of the guide frame.

7. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1, characterized in that, The wall surface of the No. 3 horn mouth (8-3) is provided with a water-permeable hole (15).

8. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1, characterized in that, The lower part of the main leg (3) of the jacket has a circular column (16). The lower end of the circular column (16) is fixedly connected to the upper end face of the suction pile body (1). Multiple suction pile connecting sections (2) are provided on the upper end face of the suction pile body (1) and around the circular column (16). A circular steel pipe is provided on the circular column (16). The through hole of the circular steel pipe forms a water filling hole (12) for connecting the inside and outside of the main leg (3) of the jacket.

9. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 1, characterized in that, The inner wall of the main leg (3) of the jacket is fixed with an exhaust pipe (13). The upper end of the exhaust pipe (13) extends out of the transition section (5) to the external space, and the lower part of the exhaust pipe (13) passes through the splash zone and extends into the full immersion zone. A No. 2 annular sealing plate (11-2) is set at the lower end of the exhaust pipe. The No. 2 annular sealing plate (11-2) seals the interior of the main leg (3) of the jacket above the No. 2 annular sealing plate (11-2).

10. The submarine cable protection pipe for offshore wind power suction pile foundations according to claim 9, characterized in that, The exhaust pipe (13) is fixed to the inner wall of the main leg (3) of the guide frame by the exhaust pipe support (14). One end of the exhaust pipe support (14) is welded to the exhaust pipe (13), and the other end of the exhaust pipe support (14) is welded to the inner wall of the main leg (3) of the guide frame.

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