Impressed current cathodic protection system for pile-barrel composite foundation

Abstract

The utility model relates to the technical field of offshore wind power, in particular to a pile-barrel composite foundation impressed current cathodic protection system which comprises a steel pipe pile, an operation platform is arranged on the steel pipe pile, an overwater detection device and a constant potential rectifier are arranged on the operation platform, and an accessory structure is hoisted on the operation platform. A fixed auxiliary anode, a fixed reference electrode and a sacrificial anode are arranged on the accessory structure in advance, the constant potential rectifier, the fixed auxiliary anode and the fixed reference electrode can be connected in series through a cable, the cable is arranged in the accessory structure, the steel pipe pile is sleeved with a barrel body, and a fixing structure is arranged between the barrel body and the steel pipe pile. An inner stud is arranged on the fixing structure, and the overwater detection device is connected with the inner stud through a zero-position inhaul cable. According to the invention, assembly is carried out in advance in a manufacturer, and on-site assembly is not needed, so that the working efficiency of subsequent installation is improved, the workload of underwater construction operation of a diver is reduced, and the risk of underwater construction operation of the diver is reduced.

Description

Technical Field

[0001] The present application relates to the field of offshore wind power technology, and in particular to an impressed current cathodic protection system for a pile-barrel composite foundation. Background Art

[0002] Offshore wind power generation technology can effectively utilize strong wind resources at sea to generate electricity, and has great development potential. However, offshore wind power equipment has long been in a harsh environment such as tides and seawater corrosion, and faces problems such as corrosion, electrochemical corrosion and current corrosion.

[0003] Cathodic protection technology is divided into sacrificial anode protection technology and impressed current protection technology. Sacrificial anode protection is to connect the protected metal with another metal or alloy with a lower electrode potential, so that the metal or alloy is consumed first as an anode, and the protected metal obtains cathode current and is protected; the impressed current cathodic protection system is generally composed of three parts: direct current, auxiliary anode and reference electrode, and the external direct current power supply and auxiliary anode provide additional cathode current to the protected metal structure, so that the corrosion of the protected metal is suppressed. Sacrificial anode cathodic protection is widely used in the field of cathodic protection of offshore wind power underwater foundations because of its many advantages such as simple installation process, no need for external power supply, and basically no need for operation and maintenance management. Since the underwater foundation of offshore wind power needs to be put in place by piling operations, the sacrificial anode cannot be welded to the outer wall of the underwater foundation in advance. Usually, the sacrificial anode installation structure is prefabricated and welded on the outer wall of the foundation before the underwater foundation is piled, and then the sacrificial anode is installed in place by diving operations, but this method requires a lot of diving construction operations, low efficiency and high risk. Therefore, further improvements can be made. Summary of the invention

[0004] In order to improve the efficiency of installation work and reduce the risk of divers performing underwater construction operations, the present application provides an impressed current cathodic protection system for a pile-barrel composite foundation.

[0005] The impressed current cathodic protection system for the pile-bucket composite foundation provided in this application adopts the following technical solutions:

[0006] The pile-barrel composite foundation impressed current cathodic protection system comprises a steel pipe pile, a working platform is arranged on the steel pipe pile, an above-water detection device and a constant potentiostat are arranged on the working platform, an auxiliary structure is hoisted on the working platform, a fixed auxiliary anode, a fixed reference electrode and a sacrificial anode are pre-arranged on the auxiliary structure, the constant potentiostat, the fixed auxiliary anode and the fixed reference electrode can be connected in series through a cable, the cable is arranged in the auxiliary structure, a barrel body is sleeved on the steel pipe pile, a fixed structure is arranged between the barrel body and the steel pipe pile, an inner stud is arranged on the fixed structure, and the above-water detection device and the inner stud are connected through a zero-position cable.

[0007] By adopting the above technical solution, the electrical connection between the underwater pile and the barrel cannot be made by welding. Therefore, the electrical connection between the steel pipe pile and the barrel is made by mechanical connection. The sacrificial anode, the fixed auxiliary anode, and the fixed reference electrode are fixedly assembled to the auxiliary structure in advance at the manufacturer without the need for on-site assembly, thereby improving the efficiency of subsequent installation and reducing the workload of divers in underwater construction operations, thereby reducing the risk of divers performing underwater construction operations.

[0008] Optionally, there are multiple fixed auxiliary anodes and multiple fixed reference electrodes, and the multiple fixed auxiliary anodes and multiple fixed reference electrodes are arranged on the auxiliary structure at intervals.

[0009] By adopting the above technical solution, multiple fixed auxiliary anodes can distribute current more evenly, effectively utilize current, improve the efficiency of cathodic protection, reduce unnecessary energy loss, ensure that the entire surface of the protected structure can obtain sufficient cathodic protection current, avoid corrosion caused by insufficient local current, and arrange multiple fixed auxiliary anodes and multiple fixed reference electrodes at intervals to help reduce interference from external current.

[0010] Optionally, the above-water detection device includes a steel column, which is installed on a working platform. The steel column is equipped with an isolation column, a connecting pipe, a pipe plug, a gland and a U-shaped clamp from bottom to top. Bolts are arranged on both sides of the isolation column. Fixing nuts, Q235 flanges, UPVC flanges and flange nuts are installed on the bolts from bottom to top. A connecting clamp is also arranged on the bolts on one side of the isolation column. A zero-position zipper is arranged on the end of the connecting clamp away from the bolt, and the other end of the zero-position zipper is connected to the bottom of the steel column.

[0011] By adopting the above technical solution and setting up an above-water detection device, the working status of the current cathodic protection system can be monitored in real time using the above-water detection device, including current and voltage parameters, to ensure the normal operation of the system. The above-water detection device helps to improve the reliability of the current cathodic protection system and ensure that the protected structure is in a good protection state.

[0012] Optionally, reinforcement plates are provided on both sides of the bottom of the steel column, and the reinforcement plates are used to strengthen the support of the steel column.

[0013] By adopting the above technical solution, the reinforcement plates located on both sides of the bottom of the steel column can improve the lateral stability of the steel column, increase the section modulus of the steel column, thereby improving its bearing capacity, enabling it to withstand greater loads, improve its bending and torsion resistance, prevent local buckling of the steel column in high stress areas, and extend its service life.

[0014] Optionally, the fixed reference electrode comprises an electrode, on which a reference electrode body, a cable, and a copper nose are installed from bottom to top, and a clip connected by a reference cable is arranged on one side of the reference electrode body.

[0015] By adopting the above technical solution, setting a fixed reference electrode can provide a stable potential reference, so that the actual potential of the protected structure can be accurately monitored to ensure that it is within the effective range of cathodic protection.

[0016] Optionally, the auxiliary structure includes a plurality of vertical supporting steel pipes and a plurality of horizontal supporting steel pipes, the plurality of vertical supporting steel pipes are wound around the steel pipe piles, and the plurality of horizontal supporting steel pipes are wound around the plurality of vertical supporting steel pipes at intervals.

[0017] By adopting the above technical solution, the auxiliary mechanism can provide a stable fixing point for the fixed auxiliary anode, the fixed reference electrode and the sacrificial anode, reducing the movement or vibration caused by water flow, wind and waves and other factors.

[0018] Optionally, the steel pipe pile is conical, and the taper range of the steel pipe pile from top to bottom is 5°-10°.

[0019] By adopting the above technical solution, the conical design can reduce the vortex generated when the steel pipe piles are passed by water in the seawater, thereby reducing the capacity loss and structural vibration caused by the vortex. The conical structure can also reduce wind resistance and water resistance, thereby reducing the load acting on the steel pipe piles.

[0020] Optionally, the fixed structure is cast by grouting material.

[0021] By adopting the above technical solution, the grouting material usually has high compressive strength and good tensile properties after hardening, which makes the fixed structure have high stability and durability.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The electrical connection between the steel pipe pile and the barrel is connected by mechanical connection, and the sacrificial anode, fixed auxiliary anode and fixed reference electrode are assembled to the auxiliary structure in advance at the manufacturer, without the need for on-site assembly, thereby improving the efficiency of subsequent installation and reducing the workload of divers in underwater construction operations, thereby reducing the risk of divers in underwater construction operations;

[0024] 2. Set up an on-water detection device, which can monitor the working status of the current cathodic protection system in real time, including current and voltage parameters, to ensure the normal operation of the system. The on-water detection device helps to improve the reliability of the current cathodic protection system and ensure that the protected structure is in a good protection state;

[0025] 3. The conical design can reduce the eddy currents generated when the steel pipe piles are passed by water in the seawater, thereby reducing the capacity loss and structural vibration caused by the eddy currents. The conical structure can also reduce wind resistance and water resistance, thereby reducing the load acting on the steel pipe piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of this embodiment from a side view.

[0027] Figure 2 It is a cross-sectional schematic diagram of the fixed reference electrode structure.

[0028] Figure 3 yes Figure 1 Schematic diagram of the specific structure of the above-water detection device in position A.

[0029] Description of reference numerals:

[0030] 1. Steel pipe pile; 2. Working platform; 3. Water detection device; 31. Steel column; 32. Isolation column; 321. Bolt; 322. Fixing nut; 323. Q235 flange; 324. UPVC flange; 325. Flange nut; 326. Connecting clamp; 327. Zero position zipper; 328. Reinforcement plate; 33. Connecting pipe; 34. Pipe plug; 35. Cable gland; 36. U-type clamp; 4. Constant potential instrument; 5. Auxiliary structure; 51. Vertical support steel pipe; 52. Horizontal support steel pipe; 6. Fixed reference electrode; 61. Electrode; 62. Electrode body; 63. Cable; 64. Copper nose; 65. Reference cable; 66. Clip; 7. Fixed auxiliary anode; 8. Sacrificial anode; 9. Barrel; 10. Fixed structure; 11. Grouting material; 12. Inner stud; 13. Zero position cable. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The embodiments of the present application disclose an impressed current cathodic protection system for a pile-barrel composite foundation.

[0033] Reference Figure 1 , 23. The impressed current cathodic protection system of the pile-barrel composite foundation comprises a conical steel pipe pile 1, on which a working platform 2 is arranged, on which an above-water detection device 3 and a constant potential instrument 4 are arranged, and an auxiliary structure 5 is hoisted at the bottom of the working platform 2, which is sleeved on the steel pipe pile 1, and on which a plurality of fixed auxiliary anodes 7, a plurality of fixed reference electrodes 6 and a plurality of sacrificial anodes 8 are pre-arranged, wherein the constant potential instrument 4, the fixed auxiliary anode 7 and the fixed reference electrode 6 can be connected in series via a cable 63 arranged in the auxiliary structure, a barrel body 9 is sleeved at the bottom of the steel pipe pile 1, and a fixed structure 10 cast by a grouting material 11 is arranged between the barrel body 9 and the steel pipe pile 1, and the grouting material 11 makes the fixed structure 10 have high stability and durability; an inner stud 12 is arranged on the fixed structure 10, and the inner stud 12 and the above-water detection device 3 are connected by a zero-position cable 13. In this embodiment, the taper range of the steel pipe pile 1 from top to bottom is 5°-10°. In this embodiment, the taper of the steel pipe pile 1 is 7°, and in other embodiments it can be 5°, 6°, 8°, 9°, 10°, etc.

[0034] During the actual installation process, the electrical connection between the underwater pile and the barrel cannot be achieved by welding. Therefore, the electrical connection between the steel pipe pile 1 and the barrel is made by mechanical connection. The sacrificial anode 8, the fixed auxiliary anode 7, and the fixed reference electrode 6 are fixedly assembled to the auxiliary structure 5 in advance at the manufacturer without the need for on-site assembly, thereby improving the efficiency of subsequent installation and reducing the workload of divers in underwater construction operations, thereby reducing the risk of divers performing underwater construction operations.

[0035] refer to Figure 1 Specifically, in this embodiment, the auxiliary structure 5 includes a plurality of vertical support steel pipes 51 and a plurality of horizontal support steel pipes 52. The plurality of vertical support steel pipes 51 are wound along the length direction of the steel pipe pile 1, and the plurality of horizontal support steel pipes 52 are wound on the plurality of vertical support steel pipes 51 with the steel pipe pile 1 as the center. The auxiliary structure is used to provide a stable fixed point, and a plurality of fixed auxiliary anodes 7 and a plurality of fixed reference electrodes 6 are arranged at intervals at the bottom of the vertical support steel pipe 51.

[0036] During actual use, multiple fixed auxiliary anodes 7 can distribute current more evenly, effectively utilize current, improve the efficiency of cathodic protection, reduce unnecessary energy loss, ensure that the entire surface of the protected structure can obtain sufficient cathodic protection current, and avoid corrosion caused by insufficient local current. The spacing between multiple fixed auxiliary anodes 7 and multiple fixed reference electrodes 6 helps to reduce interference from external current.

[0037] refer to Figure 1 , 2Specifically, in this embodiment, the fixed reference electrode 6 includes an electrode 61, and the electrode 61 is equipped with a reference electrode body 62, a cable 63, and a copper nose 64 from bottom to top, and a clip 66 connected by a reference cable 65 is provided on one side of the reference electrode body 62. In actual use, the fixed reference electrode 6 can provide a stable potential reference, so that the actual potential of the protected structure can be accurately monitored to ensure that it is within the effective range of cathodic protection.

[0038] refer to Figure 1 , 3 Specifically, in this embodiment, the water detection device 3 includes a steel column 31, which is installed on the working platform 2. The steel column 31 is installed with an isolation column 32, a connecting pipe 33, a pipe plug 34, a gland 35 and a U-shaped clamp 36 from bottom to top. Bolts 321 are provided on both sides of the isolation column 32. Fixing nuts 322, Q235 flanges 323, UPVC flanges 324 and flange nuts 325 are installed on the bolts 321 from bottom to top. A connecting clamp 326 is also provided on the bolt 321 on one side of the isolation column 32. A zero-position zipper 327 is provided on the end of the connecting clamp 326 away from the bolt 321, and the other end of the zero-position zipper 327 is connected to the bottom of the steel column 31. Reinforcement plates 328 are provided on both sides of the bottom of the steel column 31. The reinforcement plates 328 are used to improve the lateral stability of the steel column 31 and increase the section modulus of the steel column 31, thereby improving its bearing capacity. In actual use, an above-water detection device 3 is provided. The above-water detection device 3 can be used to monitor the working status of the current cathodic protection system in real time, including current and voltage parameters, to ensure the normal operation of the system. The above-water detection device 3 helps to improve the reliability of the current cathodic protection system and ensure that the protected structure is in a good protection state.

[0039] The implementation principle of the impressed current cathodic protection system of the pile-barrel composite foundation in the embodiment of the present application is as follows: the electrical connection between the underwater pile and the barrel cannot be achieved by welding, so the electrical connection between the steel pipe pile 1 and the barrel is connected by mechanical connection, and the sacrificial anode 8, the fixed auxiliary anode 7, and the fixed reference electrode 6 are fixedly assembled to the auxiliary structure 5 in advance at the manufacturer, without the need for on-site assembly, thereby improving the work efficiency of subsequent installation and reducing the workload of divers in underwater construction operations, thereby reducing the risk of divers performing underwater construction operations.

[0040] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Pile-bucket composite foundation impressed current cathodic protection system, characterized by: The invention comprises a steel pipe pile (1), wherein a working platform (2) is arranged on the steel pipe pile (1), wherein an above-water detection device (3) and a constant potential instrument (4) are arranged on the working platform (2), wherein an auxiliary structure (5) is suspended on the working platform (2), wherein a fixed auxiliary anode (7), a fixed reference electrode (6) and a sacrificial anode (8) are pre-arranged on the auxiliary structure (5), wherein the constant potential instrument (4), the fixed auxiliary anode (7) and the fixed reference electrode (6) can be connected in series via a cable (63), wherein the cable (63) is arranged in the auxiliary structure (5), wherein a barrel (9) is sleeved on the steel pipe pile (1), wherein a fixed structure (10) is arranged between the barrel (9) and the steel pipe pile (1), wherein an inner stud (12) is arranged on the fixed structure (10), and wherein the above-water detection device (3) and the inner stud (12) are connected via a zero-position cable (13).

2. The pile-bucket composite foundation impressed current cathodic protection system according to claim 1 is characterized by: There are multiple fixed auxiliary anodes (7) and multiple fixed reference electrodes (6), and the multiple fixed auxiliary anodes (7) and multiple fixed reference electrodes (6) are arranged on the auxiliary structure (5) at intervals.

3. The pile-bucket composite foundation impressed current cathodic protection system according to claim 1, characterized in that: The above-water detection device (3) comprises a steel column (31), which is installed on the working platform (2). The steel column (31) is installed with an isolation column (32), a connecting pipe (33), a pipe plug (34), a gland (35) and a U-shaped clamp (36) from bottom to top. Bolts (321) are arranged on both sides of the isolation column (32). A fixing nut (322), a Q235 flange (323), a UPVC flange (324) and a flange nut (325) are installed on the bolt (321) from bottom to top. A connecting clamp (326) is also arranged on the bolt (321) on one side of the isolation column (32). A zero position zipper (327) is arranged at one end of the connecting clamp (326) away from the bolt (321), and the other end of the zero position zipper (327) is connected to the bottom of the steel column (31).

4. The impressed current cathodic protection system for pile-bucket composite foundation according to claim 3 is characterized by: Reinforcement plates (328) are provided on both sides of the bottom of the steel column (31), and the reinforcement plates (328) are used to strengthen the support of the steel column (31).

5. The pile-bucket composite foundation impressed current cathodic protection system according to claim 1 is characterized by: The fixed reference electrode (6) comprises an electrode (61), on which a reference electrode body (62), a cable (63), and a copper nose (64) are installed from bottom to top, and a clip (66) connected by a reference cable (65) is arranged on one side of the reference electrode body (62).

6. The impressed current cathodic protection system for pile-bucket composite foundation according to claim 1 is characterized by: The auxiliary structure (5) comprises a plurality of vertical support steel pipes (51) and a plurality of horizontal support steel pipes (52). The plurality of vertical support steel pipes (51) are wound around the steel pipe piles (1), and the plurality of horizontal support steel pipes (52) are wound around the plurality of vertical support steel pipes (51) at intervals.

7. The pile-bucket composite foundation impressed current cathodic protection system according to claim 1, characterized in that: The steel pipe pile (1) is conical, and the taper range of the steel pipe pile (1) from top to bottom is 5°-10°.

8. The pile-bucket composite foundation impressed current cathodic protection system according to claim 1, characterized in that: The fixed structure (10) is cast and formed using grouting material (11).

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