Floating type impressed current cathodic protection system suitable for wind power single pile foundation

Abstract

The utility model discloses a floating type impressed current cathode protection system suitable for a wind power single pile foundation. The floating type impressed current cathode protection system comprises a floating type tensioning device, a composite cable assembly and a traction fixing device which are sequentially arranged from top to bottom. The composite cable assembly and the floating type tensioning device are connected through an anchoring device, and the composite cable assembly and the traction fixing device are connected through an anchoring device. An auxiliary anode and a reference electrode are integrated on the composite cable assembly. The cathode protection device is suitable for providing cathode protection for an underwater single pile structure (wind power steel pipe pile), solves the problem that pretension is inconvenient to apply in a use space, avoids the problem of over-protection or under-protection of the underwater single pile structure, is low in system installation difficulty and simple to maintain, and can be replaced in service.

Description

Technical Field

[0001] The utility model belongs to the field of marine engineering anticorrosion, and in particular relates to a floating impressed current cathodic protection system suitable for wind power monopile foundations. Background Art

[0002] Currently, offshore wind power projects often use large-diameter steel pipe piles as wind turbine foundations, due to their low cost and simple construction. However, the marine environment is harsh and complex. Affected by factors such as the marine atmosphere (high humidity and high salinity), the splash zone, the alternating dry and wet conditions in the tidal range, seawater erosion in the fully immersed area, and biological attachment, offshore wind power equipment and foundation structures place higher demands on corrosion control. This is especially true for the steel pipe piles that form the foundation of offshore wind power, which are subject to severe corrosion due to the complex and harsh marine environment. Therefore, cathodic protection measures are commonly used to control corrosion.

[0003] Impressed current cathodic protection technology has the advantages of being environmentally friendly, flexible in use, requiring low one-time investment, and allowing for easy adjustment of protection status. In recent years, it has been increasingly widely used in the offshore wind power sector. However, traditional impressed current devices are relatively scattered, making installation difficult, and the coordination process, as well as subsequent maintenance and replacement, is relatively difficult. Furthermore, wind turbine piles are often located in harsh sea conditions, and traditional impressed current equipment is prone to violent movement during operation, and may even collide with the wind turbine piles. Therefore, with the rapid development of offshore wind power from nearshore to deep sea, it is necessary to design an impressed current cathodic protection system suitable for offshore wind power steel pipe piles to address the above-mentioned practical problems. Utility Model Content

[0004] The utility model is proposed to solve the problems in the prior art such as the relatively scattered distribution of traditional impressed current cathodic protection devices, the difficulty in installation, the difficulty in coordination process and future maintenance and replacement, and the tendency of traditional impressed current cathodic protection devices to undergo violent movement in harsh sea conditions. Its purpose is to provide a floating impressed current cathodic protection system suitable for wind power monopile foundations.

[0005] The utility model is realized through the following technical solutions:

[0006] A floating impressed current cathodic protection system suitable for wind power monopile foundations comprises a floating tensioning device, a composite cable assembly and a traction and fixing device arranged in sequence from top to bottom; the composite cable assembly and the floating tensioning device, as well as the traction and fixing device, are connected via an anchoring device; an auxiliary anode and a reference electrode are integrated on the composite cable assembly.

[0007] In the above technical solution, the floating tensioning device is a spherical float.

[0008] In the above technical solution, the composite cable assembly includes a composite cable, a sealing cover arranged at the top of the composite cable, and a splitter arranged at the bottom of the composite cable; the bottom of the composite cable is separated into a branch cable through the splitter, and the branch cable extends upward along the inner wall of the wind turbine pile and is connected to the junction box.

[0009] In the above technical solution, cable knots are provided at the top end of the sealing cover and the bottom end of the divider.

[0010] In the above technical solution, the traction fixing device includes a perforated plate, two traction steel ropes and two lifting ears symmetrically welded and fixed to the inner wall of the wind turbine pile; one end of the traction steel rope is fixed to the perforated plate through a shackle; the other end is connected to the lifting ear through a shackle.

[0011] In the above technical solution, a reinforcing rib is welded to the bottom end of the lifting ear.

[0012] In the above technical solution, the orifice plate is a three-hole orifice plate, and the centers of the three connecting holes form an equilateral triangle.

[0013] In the above technical solution, the anchoring device includes a tensioning anchor chain and shackles provided at both ends of the tensioning anchor chain; the anchoring device and the composite cable assembly are detachably connected via the shackles and the cable knots.

[0014] In the above technical solution, the protection system is arranged in the wind turbine monopile and is located below the water level.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides a floating impressed current cathodic protection system suitable for wind power monopile foundation, which is suitable for providing cathodic protection for underwater monopile structure (wind power steel pipe pile), solves the problem of inconvenience in applying pre-tensioning force in the use space, avoids the problem of over-protection or under-protection of underwater monopile structure, has low installation difficulty and simple maintenance, and can be replaced in service; the system is installed in the monopile, and the composite cable is tensioned in the inner wall by the float, without the need for traditional mechanical tensioning method, and uses the natural tensioning of the float. During operation, no violent movement will occur, and no collision with the structure of the inner wall of the monopile will occur; compared with other forms of ICCP system devices, the installation is simple, a large amount of rooting structure welding can be reduced, and it can be replaced in service, which improves the convenience of wind power operation and maintenance; the upper part uses the buoyancy of the float to provide tensioning force, and the pre-tensioning force is easy to apply. There is no need to arrange tensioning devices such as lifting ears, shackles, and anchor chains on the upper part, which reduces the difficulty of on-site installation and facilitates maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of A;

[0019] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of B.

[0020] in:

[0021] 1. Spherical float; 2. Composite cable; 21. Branch cable; 3. Sealing cover; 4. Splitter; 5. Cable segment; 6. Orifice plate; 7. Traction wire rope; 8. Lifting lug; 9. Tensioning anchor chain; 10. Auxiliary anode; 11. Reference electrode; 12. Wind power monopile.

[0022] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] like Figures 1 to 3 As shown, a floating impressed current cathodic protection system suitable for a wind power monopile foundation includes a floating tensioning device, a composite cable assembly, and a traction and fixing device arranged in sequence from top to bottom; the composite cable assembly and the floating tensioning device, as well as the composite cable assembly and the traction and fixing device, are connected by an anchoring device; a plurality of auxiliary anodes 10 and a plurality of reference electrodes 11 are provided on the composite cable assembly, and the auxiliary anodes 10 and the reference electrodes 11 are arranged in an alternating manner.

[0025] The floating tensioning device is a spherical float 1. The specifications of the spherical float 1 are determined according to the tension to ensure that the spherical float 1 is below the lowest water level. The buoyancy of the spherical float 1 is used to provide a stable pre-tension. The set pre-tension can be achieved by adjusting the size of the spherical float 1.

[0026] The composite cable assembly includes a composite cable 2, a sealing cover 3 provided at the top of the composite cable 2, and a splitter 4 provided at the bottom of the composite cable 2; the top of the composite cable 2 is sealed by the sealing cover 3; the bottom of the composite cable 2 is split into a branch cable 21 through the splitter 4, and the branch cable 21 is led along the traction wire rope 5 to the inner wall of the wind turbine pile, and then extends upward along the inner wall of the wind turbine pile 12 to be connected to the junction box; the branch cable 21 and the traction wire rope 5 are tied and fixed by a cable tie; a cable node 5 is provided at the top of the sealing cover 3 and the bottom of the splitter 4;

[0027] The traction fixing device includes a perforated plate 6, two traction steel wire ropes 7, and two lifting ears 8 symmetrically welded and fixed to the inner wall of the wind power monopile 12; one end of the traction steel wire rope 7 is fixed to the perforated plate 6 through a shackle; the other end is connected to the lifting ear 8 through a shackle;

[0028] In this embodiment, in order to facilitate connection, the orifice plate 6 is a three-hole orifice plate, and the three connected circle centers form an equilateral triangle;

[0029] In this embodiment, in order to enhance the stability of the lifting lug 8, a reinforcing rib is welded to the bottom end of the lifting lug 8;

[0030] The anchoring device includes a tensioning anchor chain 9 and shackles provided at both ends of the tensioning anchor chain 9; the length of the tensioning anchor chain 9 can be selected as needed; the anchoring device and the composite cable assembly are detachably connected through the shackle and the cable segment 5;

[0031] The auxiliary anode 10 and the reference electrode 11 are highly integrated with the composite cable. The auxiliary anode and the reference electrode need to be spaced apart, and their specific positions are determined according to the cathodic protection and monitoring requirements.

[0032] The watertight tail line of the auxiliary anode 10 is tied along the bottom traction wire rope 7 and the inner wall of the wind power pile 12 and laid in the equipment room;

[0033] The number of auxiliary anodes integrated into the composite cable can be determined based on the protection current requirements of the wind turbine monopile foundation. Multiple auxiliary anodes are connected in parallel, with each anode receiving a separate power supply cable (one strand of the composite cable 2), improving the reliability and redundancy of the system. When one auxiliary anode circuit is disconnected, the other auxiliary anodes can continue to release current to provide cathodic protection for the underwater monopile structure. A reference electrode 9 installed on the inner wall of the wind turbine monopile 12 can monitor the structural potential of the inner wall in real time, serving as a basis for controlling the output current of the auxiliary anode 8.

[0034] The protection system is arranged in the wind power monopile 12 and is located below the water level.

[0035] In this embodiment, detachable connections are achieved by using shackles between the lifting lug 8 and the traction wire rope 7, between the traction wire rope 7 and the orifice plate 6, between the anchoring device and the composite cable assembly, between the anchoring device and the orifice plate 6, and between the anchoring device and the floating tensioning device; the shackles involved in this application are all D-type shackles.

[0036] The on-site installation steps of this utility model are as follows:

[0037] 1) Two lifting lugs 8 are symmetrically welded at the bottom of the inner wall of the wind turbine pile;

[0038] 2) The bottom cable segment of the composite cable is fixed to the bottom of the inner wall of the wind turbine pile through the shackle, tensioning anchor chain, perforated plate, traction wire rope and lifting lug;

[0039] 3) Connect the top cable segment of the composite cable to the bottom of the spherical float through a shackle and a tensioning anchor chain;

[0040] 4) Pull the composite cable along the traction wire rope to the inner wall of the wind turbine pile and secure it with a cable tie;

[0041] 5) The composite cable tail is fixed to the cable feet on the inner wall by welding and laid to the equipment room and connected to the power control cabinet.

[0042] The working principle of this utility model:

[0043] After the equipment is installed, the power supply device located between the equipment supplies power to the underwater auxiliary anode. The positive pole of the power module is connected to the auxiliary anode through a composite cable, and the negative pole is connected to the wind turbine monopile structure. The protection current provided by the power module flows into the wind turbine monopile structure through the auxiliary anode and seawater, and returns to the power module to form a loop. The surface of the underwater structure of the wind turbine monopile is polarized, and its potential shifts negatively, thereby realizing cathodic protection.

[0044] When the floating ICCP system equipment needs to be replaced, the shackle between the lower composite cable assembly and the orifice plate 6 and the binding belt between the branch cable 21 and the traction wire rope 7 can be untied. At this time, the upper spherical float 1 floats to the surface, the composite cable 2 is led out to near the waterline, the composite cable 2 is replaced, the end of the newly replaced composite cable 2 is connected to the spherical float 1, and the spherical float 1 is submerged by the counterweight. At this time, the lower end of the composite cable 2 is connected to the orifice plate 6 7. After the connection is completed, the counterweight is released, the upper spherical float 1 floats up and the composite cable 2 is tensioned. Then, the watertight tail line of the auxiliary anode 10 is tied along the bottom traction wire rope 7 and the inner wall of the wind turbine pile 12 and laid to the equipment room.

[0045] The floating ICCP system of the present invention realizes cathodic protection for offshore wind turbine piles 12, which can play a good role in corrosion protection. The system is set inside the wind turbine pile 12, without harsh sea conditions. The composite cable 2 is tensioned in the inner wall through the spherical float 1. It will not move violently during operation and will not collide with the structure of the inner wall of the wind turbine pile 12. In addition, the system tensions the composite cable 2 integrated with the auxiliary anode 10 through the upper spherical float 1, and the pre-tension is easy to apply. There is no need to arrange tensioning devices such as lifting lugs, shackles, and anchor chains on the upper part, and auxiliary anodes of different heights can provide cathodic protection for different areas. Compared with other forms of ICCP system devices, this device is easy to install, can reduce a large amount of rooting structure welding, and can be replaced in service, thereby improving the convenience of wind power operation and maintenance.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0048] The applicant declares that the above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present invention fall within the protection scope and disclosure scope of the present invention.

Claims

1. A floating impressed current cathodic protection system suitable for wind power monopile foundation, characterized by: The invention comprises a floating tensioning device, a composite cable assembly and a traction fixing device which are arranged in sequence from top to bottom; the composite cable assembly and the floating tensioning device as well as the composite cable assembly and the traction fixing device are connected via an anchoring device; and a plurality of auxiliary anodes (10) and reference electrodes (11) which are distributed at intervals are arranged on the composite cable assembly.

2. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 1 is characterized in that: The floating tensioning device is a spherical float (1).

3. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 1 is characterized in that: The composite cable assembly comprises a composite cable (2), a sealing cover (3) arranged at the top end of the composite cable (2), and a splitter (4) arranged at the bottom end of the composite cable (2); a branch cable (21) is split at the bottom end of the composite cable (2) through the splitter (4); the branch cable (21) extends upward along the inner wall of the wind power monopile (12) and is connected to a junction box.

4. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 3 is characterized in that: Cable knots (5) are provided at the top end of the sealing cover (3) and the bottom end of the wire divider (4).

5. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 1 is characterized in that: The traction fixing device comprises an orifice plate (6), two traction steel wire ropes (7), and two lifting ears (8) symmetrically welded and fixed to the inner wall of a wind power monopile (12); one end of the traction steel wire rope (7) is fixed to the orifice plate (6) via a shackle; and the other end is connected to the lifting ear (8) via the shackle.

6. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 5 is characterized in that: A reinforcing rib is welded to the bottom end of the lifting ear (8).

7. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 5 is characterized in that: The orifice plate (6) is a three-hole orifice plate, and the centers of the three connecting holes form an equilateral triangle.

8. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 1 is characterized in that: The anchoring device comprises a tensioning anchor chain (9) and shackles arranged at both ends of the tensioning anchor chain (9); the anchoring device and the composite cable assembly are detachably connected via the shackle and the cable knot (5).

9. The floating impressed current cathodic protection system suitable for wind power monopile foundation according to claim 1 is characterized in that: The protection system is arranged in the wind power monopile (12) and is located below the water level.

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