Offshore wind power pile coating structure integrity monitoring device and method

Abstract

The present application relates to a kind of offshore wind power pile coating structure integrity monitoring device and method.Wind power pile outer wall is equipped with anticorrosion coating structure and monitoring device, coating structure includes anticorrosion paste layer, anticorrosion tape layer, sealing buffer layer and protective cover in turn from inside to outside;Monitoring device includes protective cover monitoring module, humidity monitoring module and corrosion monitoring module, in turn realize coating protective cover breakage and impact monitoring, coating sealing buffer layer water penetration monitoring and wind power pile surface corrosion monitoring;Failure grading is carried out for the failure of protective cover, sealing buffer layer and wind power pile, and corresponding maintenance strategy is formulated.The present application adopts three monitoring methods from inside to outside to wind power pile coating, realizes the integrity monitoring of wind power pile coating structure, helps wind farm operation and maintenance personnel to understand coating state in time, handles the corrosion hidden danger of wind power pile in advance, and improves the operation and maintenance efficiency of offshore wind turbine.

Description

Technical Field

[0001] This invention relates to the field of offshore wind turbine pile monitoring, and in particular to a device and method for monitoring the integrity of the offshore wind turbine pile's covering structure. Background Technology

[0002] Offshore wind turbine piles operate in a complex marine environment, subject to high humidity, high salt spray, long hours of sunlight, seawater immersion, and biofouling, resulting in complex corrosion conditions. Steel pipe pile structures located in splash zones and tidal zones are particularly susceptible to severe corrosion due to ample oxygen supply, seawater splash, and alternating wet and dry conditions. Corrosion protection for offshore wind turbine piles typically employs a coating plus cathodic protection method. However, frequent collisions with floating debris and ship anchorages can severely damage the coated areas, and cathodic protection is also affected by tides and becomes ineffective.

[0003] Traditional cladding technologies such as FRP, PTC, and corrosion-resistant steel can provide long-term protection for wind turbine pile structures, thus compensating for the shortcomings of coating and cathodic protection methods. However, due to the opacity of current cladding materials, once corrosive media enter the cladding layer, they will form hidden corrosion. Inspectors will not be able to deal with the corrosion hazards in time, which will cause more serious safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for monitoring the integrity of the covering structure of offshore wind turbine piles.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to provide a monitoring device for the integrity of the outer wall of a wind turbine pile, wherein the outer wall of the wind turbine pile is provided with a corrosion-resistant outer wall and a monitoring device, and the outer wall is provided with a corrosion-resistant outer wall, wherein the outer wall is provided with a corrosion-resistant outer wall, a corrosion-resistant inner wall, a sealing buffer layer and a protective cover, which are wrapped from the inside to the outside.

[0006] The monitoring device includes a corrosion monitoring module disposed on the outside of the anti-corrosion paste layer;

[0007] The corrosion monitoring module includes a protective layer and a first optical fiber sensing unit disposed within the protective layer, used to monitor the corrosion status of the wind turbine pile.

[0008] Preferably, the corrosion monitoring module is spirally wound around the outside of the anti-corrosion paste layer; the protective layer is flat and elongated, formed by bonding two layers of fiber cloth, and the protective layer and the first optical fiber sensing unit are arranged in a sandwich structure.

[0009] Preferably, the corrosion monitoring module is spirally wound at equal intervals around the outside of the anti-corrosion paste layer, satisfying ΔL=2×ΔL1=2×P, where ΔL is the width of the protective layer, ΔL1 is the overlap width of the spirally wound protective layer, and P is the spacing of the spiral winding of the first optical fiber sensing unit.

[0010] Preferably, the protective cover includes two covers, and the monitoring device further includes a protective cover monitoring module for monitoring the condition of the protective cover;

[0011] The protective cover monitoring module includes a fiber optic adapter and two second fiber optic sensing units; the two second fiber optic sensing units are respectively arranged in an S-shape on the inner side of the two covers and are connected through the fiber optic adapter.

[0012] Preferably, the monitoring device further includes a humidity monitoring module for monitoring water seepage inside the covering structure; the humidity monitoring module is disposed in the sealing buffer layer and includes several humidity sensing units.

[0013] Preferably, the number of humidity sensing units is greater than two; adjacent humidity sensing units are equally spaced in the axial direction, and the included angles between the lines connecting adjacent humidity sensing units to the center of the circle in the circumferential direction are equal.

[0014] This invention also provides a method for monitoring the integrity of the outer casing structure of offshore wind turbine piles. The wind turbine pile has a corrosion-resistant casing structure and a monitoring device on its outer wall. The casing structure includes, from the inside out, a layer of anti-corrosion grease, a layer of anti-corrosion tape, a sealing buffer layer, and a protective cover. The monitoring device includes a protective cover monitoring module, a humidity monitoring module, and a corrosion monitoring module. The monitoring method includes the following steps:

[0015] The strain data of the protective cover is monitored by the protective cover monitoring module to determine whether the protective cover has failed. If so, it is determined to be an event of general concern.

[0016] The humidity monitoring module monitors the humidity information of the sealing buffer layer to determine whether the covering structure is leaking water. If so, it is determined to be a key monitoring event.

[0017] The corrosion monitoring module monitors the corrosion strain data on the surface of the wind turbine pile to determine whether corrosion has occurred. If so, it is determined to be an event that needs immediate attention.

[0018] Preferably, the step of monitoring the corrosion strain data on the surface of the wind turbine pile through the corrosion monitoring module to determine whether the wind turbine pile has corroded includes:

[0019] The initial strain data of the wind turbine pile is obtained, and the corrosion strain data is corrected for temperature to obtain the corrected corrosion strain data.

[0020] The wind turbine pile is judged to have corroded based on the corrected corrosion strain data.

[0021] Preferably, after the step of determining whether the wind turbine pile has corroded, the method further includes: drawing a strain cloud map of the wind turbine pile surface using an interpolation algorithm based on the corrected corrosion strain data and the positioning information of the corrosion monitoring module, thereby determining the corrosion area of ​​the wind turbine pile.

[0022] Preferably, it further includes:

[0023] For the aforementioned general concerns, the protective cover shall be repaired or replaced according to the maintenance plan; or...

[0024] For the aforementioned key monitoring events, develop a seepage repair plan to repair the cladding structure; or...

[0025] For the aforementioned immediate handling event, the wind turbine piles and their covering structure are immediately repaired.

[0026] The offshore wind turbine pile cladding structure integrity monitoring device and method of the present invention have the following beneficial effects: by setting a monitoring device on the wind turbine pile, the corrosion status of the wind turbine pile can be monitored in real time without the need for manual visual inspection, which helps to deal with the corrosion risks of the wind turbine pile in a timely manner. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the offshore wind turbine pile enclosure structure integrity monitoring device of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the protective cover sheet according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the corrosion monitoring module according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the winding width of the corrosion monitoring module according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the layout structure of the protective cover monitoring module according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the layout structure of the humidity monitoring module according to an embodiment of the present invention;

[0034] Figure 7 This is a flowchart illustrating the method for monitoring the integrity of the offshore wind turbine pile enclosure structure according to the present invention;

[0035] Figure 8 This is a circumferential strain curve of a steel pipe pile sample under different corrosion times according to an embodiment of the present invention.

[0036] Figure 9 This is a graph showing the variation of the average strain of the steel pipe pile specimen over time according to an embodiment of the present invention.

[0037] Figure 10 This is a strain cloud diagram of a steel pipe pile specimen according to an embodiment of the present invention;

[0038] Figure 11 This is a flowchart of the offshore wind turbine pile enclosure structure integrity monitoring process of the present invention. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection of two components or the interaction between two components. The terms "first," "second," etc., are used only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] The offshore wind turbine pile 010 has a corrosion-resistant coating structure and the monitoring device of this invention on its outer wall. The wind turbine pile 010 is a steel pipe pile. For example... Figure 1 As shown, the covering structure includes, from the inside out, an anti-corrosion paste layer 011, an anti-corrosion tape layer 013, a sealing buffer layer 015, and a protective cover 016 made of fiberglass. It also includes components such as a baffle 014, fastening bolts 017, and fastening clamps 018. The protective cover 016 includes two covers, such as... Figure 2 As shown, the two sides of the cover plate are lug-type flanges with screw holes 032 for connecting the two cover plates with fastening bolts. A fastening clamp for supporting the protective cover 016 is installed at the lower end of the protective cover 016.

[0042] First, remove marine organisms, burrs, and rust from the surface of the wind turbine pile to be protected, ensuring that the treated surface is free of obvious protrusions. Apply an anti-corrosion paste evenly to the treated surface to form an anti-corrosion paste layer 011, the thickness of which should meet the requirements of GB / T 32119-2015 standard. Wrap an anti-corrosion tape layer 013 around the anti-corrosion paste layer 011, and attach a sealing buffer layer 015 to the inside of the protective cover 016. Place a baffle inside the sealing buffer layer 015 at the flange connection of the protective cover 016. The anti-corrosion tape layer 013 can be made of petrolatum anti-corrosion tape, and the sealing buffer layer 015 can be made of a sealing buffer gasket.

[0043] In one embodiment of the offshore wind turbine pile cladding structure integrity monitoring device of the present invention, the monitoring device includes a corrosion monitoring module 012 disposed on the outside of the anti-corrosion paste layer 011. That is, the corrosion monitoring module 012 is disposed between the anti-corrosion paste layer 011 and the anti-corrosion strip layer 013.

[0044] The corrosion monitoring module 012 includes a protective layer and a first optical fiber sensing unit 022 disposed within the protective layer, used to monitor the corrosion status of the wind turbine pile. In this embodiment, the first optical fiber sensing unit 022 is used to measure the corrosion strain caused by the accumulation of corrosion products, and it can employ distributed optical fibers. Preferably, reference... Figure 3 The protective layer is a flat, elongated strip of fixed width, formed by bonding two layers of fiber cloth 020 and 021 together. The protective layer and the first fiber optic sensing unit 022 are arranged in a sandwich structure. The two layers of fiber cloth can be two separate, elongated strips, or a single strip folded in half. The first fiber optic sensing unit 022 is placed in the middle of the protective layer, slightly longer than the protective layer, with its two ends not covered by the protective layer serving as the start and end ends, respectively. Epoxy adhesive is used to bond the two layers of fiber cloth and the first fiber optic sensing unit 022 together, and then compact them to form the flat, elongated sandwich structure. This protective layer serves to protect the first fiber optic sensing unit 022, increase the contact area between the first fiber optic sensing unit 022 and the wind turbine pile, improve the sensing ability of the first fiber optic sensing unit 022 to detect corrosion strain caused by the accumulation of corrosion products, and prevent corrosion products from being washed away by water flow, thus slowing down the loss of corrosion products and ensuring the accuracy of monitoring. Furthermore, using a double-layer fiber cloth structure as a protective layer can maintain high adhesion after contact with water, making it less likely to fall off and avoiding additional strain changes.

[0045] Furthermore, the corrosion monitoring module 012 is spirally wound around the outside of the anti-corrosion grease layer 011. After applying the anti-corrosion grease layer 011, the corrosion monitoring module 012 is spirally wound around the central axis of the wind turbine pile to fully cover the section to be protected. The specific setup process is as follows: the starting end of the first fiber optic sensing unit 022 is fixed to the upper part of the section to be protected on the wind turbine pile with epoxy adhesive. The length of the adhesive section should be 5cm to 10cm to ensure a good fixation effect. Then, a certain tensile force is applied to tightly wrap the corrosion monitoring module 012 around the outside of the anti-corrosion grease layer 011. During the winding process, the corrosion monitoring module 012 should be spirally wound around the outside of the anti-corrosion grease layer 011 at equal intervals to ensure that the spacing between adjacent fibers is the same, which facilitates subsequent monitoring data analysis. The winding height of the corrosion monitoring module 012 along the axial direction of the wind turbine pile should cover the entire height of the section to be protected. After the winding is completed, the end is also fixed with epoxy glue. The length of the bonded section should be 5cm to 10cm. Leave a 15cm to 20cm long optical fiber after the end, without stretching it, so that it remains in its natural state to compensate for strain changes caused by temperature.

[0046] Preferably, refer to Figure 4 When spirally wound, the following conditions must be met: ΔL = 2 × ΔL1 = 2 × P, where ΔL is the width of the protective layer, ΔL1 is the overlap width of the spirally wound protective layer, and P is the spacing of the spiral winding of the first optical fiber sensing unit 022, which is also the spacing between adjacent optical fibers. This winding method helps to compact the fiber cloth tightly during winding, ensuring that the spacing between adjacent surrounding optical fibers is consistent.

[0047] In an optional embodiment, the monitoring device further includes a protective cover monitoring module for monitoring the condition of the protective cover 016, which is disposed between the protective cover 016 and the sealing buffer layer 015. The protective cover monitoring module includes a fiber optic adapter 031 and two second fiber optic sensing units; the two second fiber optic sensing units are respectively arranged in an S-shape on the inner side of the two covers and are connected through the fiber optic adapter 031.

[0048] Specifically, the protective cover monitoring module also includes fiber cloth, the second fiber optic sensing unit 033 uses distributed optical fiber, and the fiber optic adapter 031 uses a fiber optic flange adapter. For example... Figure 5 As shown, optical fibers are attached to the inner surface of the protective cover 016 in an "S" shape, forming multiple bends and multiple parallel folds in the circumferential direction. A layer of fiber cloth 034 is then laid outside the optical fibers for protection. The fiber optic connectors on the two covers are connected via fiber optic flange adapters. When the protective cover 016 experiences structural deformation, localized cracks, or is subjected to external impact, the circumferential strain change on the inner surface of the protective cover 016 can be monitored by the protective cover monitoring module to achieve structural deformation monitoring and impact event identification.

[0049] Furthermore, the monitoring device also includes a humidity monitoring module for monitoring water seepage inside the covering structure; the humidity monitoring module is located in the sealed buffer layer 015 and includes several humidity sensing units 019. Among them, the humidity sensing units 019 are fiber optic hygrometers, and multiple humidity sensing units 019 are evenly arranged inside the sealed buffer layer 015 for monitoring water seepage inside the protective cover 016, which is beneficial for maintenance personnel to repair and handle the failed areas of the covering structure in a timely manner.

[0050] In one optional embodiment, the number of humidity sensing units 019 is greater than two; adjacent humidity sensing units 019 are equally spaced in the axial direction, and the angles between the lines connecting adjacent humidity sensing units 019 to the center of the circle in the circumferential direction are equal. The humidity monitoring module includes three fiber Bragg grating hygrometers, such as... Figure 6 As shown in (a), three fiber Bragg grating hygrometers are equally spaced at the top, middle, and bottom of the sealed buffer layer 015, as follows: Figure 6 As shown in (b), the three fiber Bragg grating hygrometers are arranged at 120° angles to each other along the circumferential direction of the wind turbine pile. In other embodiments, the number of fiber Bragg grating hygrometers can be two, four, or other, and the angles between the lines connecting adjacent humidity sensing units 019 in the circumferential direction and the center of the circle are 180°, 90°, or other angles, respectively.

[0051] Furthermore, the monitoring device also includes a fiber optic demodulation unit and armored optical cables. The first fiber optic sensing unit 022, the second fiber optic sensing unit, and the fiber Bragg grating hygrometer are connected to the fiber optic demodulation unit via armored optical cables. The fiber optic demodulation unit is installed above the section to be protected to avoid contact with seawater. The fiber optic demodulation unit measures the optical signals of each monitoring module, converts them into monitoring data in physical units, and then transmits the monitoring data to maintenance personnel.

[0052] By installing monitoring devices on the cladding structure of wind turbine piles, the integrity of both the wind turbine piles and the cladding structure can be monitored in real time, eliminating the need for manual visual inspection and facilitating timely handling of potential hazards. The corrosion monitoring module 012 monitors corrosion strain on the wind turbine pile surface, the humidity monitoring module monitors water seepage in the cladding structure, and the protective cover monitoring module identifies structural deformation and external impact events in the protective cover 016.

[0053] In one embodiment of the offshore wind turbine pile cladding structure integrity monitoring method of the present invention, the monitoring method simultaneously achieves triple monitoring of the cladding structure integrity by using the offshore wind turbine pile cladding structure integrity monitoring device of the present invention, namely, circumferential strain monitoring, humidity monitoring, and corrosion strain monitoring. Figure 7 As shown, the monitoring method includes the following steps:

[0054] S1. Monitor the strain data of the protective cover through the protective cover monitoring module to determine whether the protective cover has failed. If so, it is determined to be a general concern event.

[0055] S2. Monitor the humidity information of the sealing buffer layer through the humidity monitoring module to determine whether the covering structure is leaking water. If so, it is determined to be a key monitoring event.

[0056] S3. Monitor the corrosion strain data on the surface of the wind turbine pile through the corrosion monitoring module to determine whether the wind turbine pile has been corroded. If so, it is determined to be an event that needs to be handled immediately.

[0057] like Figure 11 As shown, when the outermost protective cover 016 of the cladding structure undergoes structural deformation, local cracks, or is subjected to external impact, its integrity is compromised, leading to changes in the circumferential strain of the protective cover. Therefore, the circumferential strain data of the protective cover can be monitored through the protective cover monitoring module. When the circumferential strain exceeds the preset circumferential strain threshold, the protective cover is judged to have failed, which is considered a general concern event. When the cladding structure is damaged or its sealing performance deteriorates, water seepage will occur inside the cladding structure. Therefore, humidity monitoring is performed through a humidity monitoring module installed in the sealing buffer layer. If the humidity exceeds the preset humidity threshold, it indicates that water seepage has occurred in the cladding structure, which is considered a key monitoring event. After water seepage in the cladding structure, direct contact between seawater and the surface of the wind turbine pile will cause corrosion of the wind turbine pile. The corrosion monitoring module monitors the surface of the wind turbine pile to obtain corrosion strain data, i.e., strain change data caused by the accumulation of corrosion products. When this strain exceeds the preset corrosion strain threshold, corrosion of the wind turbine pile is determined, which is considered an immediate handling event. The circumferential strain threshold, humidity threshold, and corrosion strain threshold are all set according to actual monitoring needs.

[0058] Furthermore, for incidents of general concern, the protective cover is repaired or replaced according to the maintenance plan; or, for incidents under key monitoring, a water seepage maintenance plan is developed to repair the cladding structure; or, for incidents requiring immediate handling, the wind turbine piles and cladding structure are repaired immediately.

[0059] The protective cover is the outermost layer of protection; therefore, its failure poses minimal risk to the integrity of the cladding structure and the wind turbine piles. In the event of such an incident, the protective cover can be repaired or replaced according to the maintenance plan. Water seepage into the cladding structure can lead to corrosion of the wind turbine piles, which poses a certain risk to the integrity of the cladding structure and the wind turbine piles themselves. Therefore, a water seepage maintenance plan must be developed to repair the cladding structure. When corrosion occurs on the wind turbine piles, the wind turbine piles and cladding structure should be repaired immediately to prevent further corrosion.

[0060] In this embodiment, step S3 includes: acquiring the initial strain data of the wind turbine pile, performing temperature correction on the corrosion strain data to obtain the corrected corrosion strain data; and determining whether the wind turbine pile has corroded based on the corrected corrosion strain data.

[0061] Temperature changes can cause deformation of the first fiber optic sensing unit, and the resulting additional strain may affect the accuracy of the monitoring and analysis results. Therefore, temperature correction is needed for the corrosion strain data obtained from the monitoring. After the cladding structure and monitoring device on the wind turbine pile are installed, an initial strain measurement is performed through the corrosion monitoring module, and this measurement is used as the initial strain data. In each corrosion strain monitoring session, this initial strain data is acquired, and the relative change between the monitored corrosion strain data and the initial strain data is calculated to obtain the corrected corrosion strain data. Then, it is determined whether corrosion has occurred on the wind turbine pile.

[0062] Furthermore, based on the corrected corrosion strain data and the positioning information of the corrosion monitoring module, an interpolation algorithm is used to draw a strain cloud map of the wind turbine pile surface, thereby determining the corrosion area of ​​the wind turbine pile.

[0063] Due to the opaque nature of the covering structure, manually locating corrosion areas is difficult. To facilitate repair work by maintenance personnel, it is necessary to pinpoint the corrosion area based on monitoring data. Based on the corrected corrosion strain data, the installation length of the first fiber optic sensing unit on the protected section of the wind turbine pile, and the spacing of the spiral winding, an interpolation algorithm is used to fit the strain data across the entire protected section. Then, a color strain contour map is plotted based on the fitted data. This map visually determines the axial height and circumferential length of the corrosion area within the protected section of the wind turbine pile, facilitating rapid location of the corrosion area by maintenance personnel. The interpolation algorithm can employ cubic spline interpolation, Newton interpolation, or other interpolation fitting algorithms.

[0064] Furthermore, the corrosion strain data can be used to analyze the corrosion strain change trend or corrosion degree of wind turbine piles, which helps maintenance personnel to understand the corrosion status of wind turbine piles or predict their corrosion time.

[0065] The following are verification experiments of the corrosion monitoring module and corrosion strain monitoring scheme of the present invention:

[0066] To verify the monitoring effect of the corrosion monitoring module based on the monitoring device, a steel pipe pile sample with an outer diameter of 168 mm, a wall thickness of 5 mm, and a height of 30 cm was prepared. Anti-corrosion paste was applied to the surface of the sample (to prevent corrosion), while an area was left uncoated (to allow for corrosion). The corrosion detection module was then tightly wound around the surface of the steel pipe pile sample under tensile force. After sample preparation, the sample was placed in a 3.5 wt% simulated seawater tank. Electrochemical methods were used to accelerate the corrosion of the steel pipe pile. The positive terminal of the power supply was connected to the steel pipe pile sample, and the negative terminal was connected to a graphite electrode. The output current was 2 A, and the ambient temperature and water level were periodically varied.

[0067] Figure 8 The figures show the surface strain measurement results of steel pipe piles after different accelerated corrosion times. It can be seen that with the increase of corrosion time, the corrosion products gradually increase, and the circumferential strain on the sample surface also gradually increases. In particular, the circumferential strain growth in the reserved corrosion area is very obvious, indicating that severe corrosion has occurred in this area.

[0068] Figure 9 The values ​​represent the average strain values ​​after different corrosion times. Figure 9 The strain corresponding to each point in the middle is Figure 8 The average value of all strains on the strain curve corresponding to the same time interval. Figure 9 It can be seen that the corrosion strain monitored by the optical fiber has a linear relationship with the accelerated corrosion time.

[0069] Based on the distributed strain measurement results of the steel pipe piles, the strain values ​​between adjacent optical fibers were fitted using a cubic spline interpolation algorithm, and a color strain contour map was plotted. The results are as follows: Figure 10 As shown in the figure, the red areas represent regions with larger strain values, indicating severe corrosion in these areas. The strain cloud map visually displays the severely corroded areas of the steel pipe pile, facilitating the location of corrosion zones. Localized corrosion of the steel pipe pile indicates failure of the cladding structure at that location; therefore, it allows for monitoring of the cladding status and location of the failure area, providing early warning information to maintenance personnel.

[0070] The offshore wind turbine pile cladding structure integrity monitoring device and method of this invention eliminates the need for manual visual inspection. It can achieve cladding integrity monitoring and failure early warning through built-in fiber optic strain monitoring data, greatly reducing the corrosion risk caused by wind turbine pile cladding damage. The degree of wind turbine pile corrosion can be assessed by the relationship between the fiber optic cable and corrosion strain, enabling maintenance personnel to promptly treat damaged areas and eliminate potential corrosion hazards. The fiber optic strain cloud map can accurately locate the damaged area and the corrosion position of the wind turbine pile.

[0071] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A device for monitoring the integrity of the cladding structure of offshore wind turbine piles, characterized in that, The outer wall of the wind turbine pile is equipped with a corrosion-resistant coating structure and a monitoring device. The coating structure includes, from the inside out, a layer of anti-corrosion grease, a layer of anti-corrosion tape, a sealing buffer layer, and a protective cover. The protective cover includes two covers. The monitoring device includes a humidity monitoring module for monitoring water seepage inside the covering structure, a protective cover monitoring module for monitoring the condition of the protective cover, and a corrosion monitoring module disposed on the outside of the anti-corrosion paste layer. The humidity monitoring module is disposed in the sealed buffer layer and includes several humidity sensing units; The protective cover monitoring module includes a fiber optic adapter and two second fiber optic sensing units; the two second fiber optic sensing units are respectively arranged in an S-shape on the inner side of the two covers and are connected through the fiber optic adapter. The corrosion monitoring module includes a protective layer and a first optical fiber sensing unit disposed within the protective layer, used to monitor the corrosion status of the wind turbine pile.

2. The offshore wind turbine pile cladding structure integrity monitoring device according to claim 1, characterized in that, The corrosion monitoring module is spirally wound around the outside of the anti-corrosion paste layer; the protective layer is flat and elongated, formed by bonding two layers of fiber cloth, and the protective layer and the first optical fiber sensing unit are arranged in a sandwich structure.

3. The offshore wind turbine pile cladding structure integrity monitoring device according to claim 2, characterized in that, The corrosion monitoring module is spirally wound at equal intervals around the outside of the anti-corrosion paste layer, satisfying the requirements of... , where ∆L is the width of the protective layer, ∆L1 is the overlap width of the spirally wound protective layer, and P is the spacing of the spiral winding of the first optical fiber sensing unit.

4. The offshore wind turbine pile cladding structure integrity monitoring device according to claim 1, characterized in that, The number of humidity sensing units is greater than two; adjacent humidity sensing units are equally spaced in the axial direction, and the angles between the lines connecting adjacent humidity sensing units to the center of the circle in the circumferential direction are equal.

5. A method for monitoring the integrity of the cladding structure of offshore wind turbine piles, characterized in that, The outer wall of the wind turbine pile is equipped with a corrosion-resistant coating structure and a monitoring device. The coating structure includes, from the inside out, a layer of anti-corrosion grease, a layer of anti-corrosion tape, a sealing buffer layer, and a protective cover. The monitoring device includes a protective cover monitoring module, a humidity monitoring module, and a corrosion monitoring module. The corrosion monitoring module is located outside the anti-corrosion grease layer. The monitoring method includes the following steps: The strain data of the protective cover is monitored by the protective cover monitoring module to determine whether the protective cover has failed. If so, it is determined to be an event of general concern. The humidity monitoring module monitors the humidity information of the sealing buffer layer to determine whether the covering structure is leaking water. If so, it is determined to be a key monitoring event. The corrosion monitoring module monitors the corrosion strain data on the surface of the wind turbine pile to determine whether corrosion has occurred. If so, it is determined to be an event that needs immediate attention.

6. The method for monitoring the integrity of the cladding structure of offshore wind turbine piles according to claim 5, characterized in that, The steps for determining whether corrosion has occurred on the wind turbine pile by monitoring corrosion strain data on the surface of the wind turbine pile using the corrosion monitoring module include: The initial strain data of the wind turbine pile is obtained, and the corrosion strain data is corrected for temperature to obtain the corrected corrosion strain data. The wind turbine pile is judged to have corroded based on the corrected corrosion strain data.

7. The method for monitoring the integrity of the cladding structure of offshore wind turbine piles according to claim 6, characterized in that, After the step of determining whether the wind turbine pile has corroded, the method further includes: Based on the corrected corrosion strain data and the positioning information of the corrosion monitoring module, a strain cloud map of the wind turbine pile surface is drawn using an interpolation algorithm, thereby determining the corrosion area of ​​the wind turbine pile.

8. The method for monitoring the integrity of the cladding structure of offshore wind turbine piles according to claim 5, characterized in that, Also includes: For the aforementioned general concerns, the protective cover shall be repaired or replaced in accordance with the maintenance plan; or, For the key monitoring events, a seepage repair plan was developed to repair the cladding structure. or, For the aforementioned immediate handling event, the wind turbine piles and their covering structure are immediately repaired.

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