Construction equipment and construction technology for scouring and repairing flow-state solidified soil of offshore wind turbine foundation

Abstract

The invention relates to the field of flow-state solidified soil testing devices, and particularly discloses construction equipment and a construction process for scouring and repairing flow-state solidified soil for an offshore wind turbine foundation. Comprising an overwater carrying carrier, and a material mixing pool, a water adding stirring pool, a material conveying pipeline, a material conveying pump, a slurry conveying mechanism, a flow state solidified soil scouring performance testing device, a solidified soil rotational rheometer, a fluidity test bed, a detection material taking mechanism and a control center which are arranged on the carrier. The construction device is a complete technical system covering performance integrated testing, site construction real-time detection and complex environment coupling simulation, the dual problems that research and development of a flow-state solidified soil material is lagged and site repair quality control is insufficient are effectively solved, and the safety and reliability of offshore wind turbine foundation scouring repair engineering are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of fluidized solidified soil, and in particular to a construction equipment and process for scour repair of offshore wind turbine foundations using fluidized solidified soil. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] In recent years, global offshore wind power projects have entered a phase of rapid development, with cumulative installed capacity continuing to grow. Wind turbines are also evolving towards larger sizes and deeper-sea applications (such as floating turbines and multi-pile foundation structures), placing higher demands on the long-term service safety of the foundation structures. Offshore wind turbine foundations are constantly exposed to the complex marine environment of wind, wave, and current coupling, making the seabed around the piles highly susceptible to localized scouring. This significantly reduces the foundation's burial depth, weakens its load-bearing capacity and vibration resistance, and in severe cases, can lead to turbine tilting, collapse, and other safety accidents, becoming one of the core hidden dangers threatening the safe operation of offshore wind power.

[0004] In the field of offshore wind turbine foundation scour control, traditional protection methods (such as riprap and sand covering) have limitations such as unstable protective effects, high treatment costs, and poor adaptability to the marine environment. In recent years, fluidized bed solidified soil has gradually become the preferred material for offshore wind turbine foundation scour repair due to its excellent protective effect, good economy, environmental friendliness, and strong engineering adaptability (it can adapt to different scour pit shapes). However, the inventors have discovered that fluidized bed solidified soil still faces two major technical bottlenecks in its application to offshore scour repair, and existing technologies are unable to effectively overcome these bottlenecks: 1. Limited testing methods for fluidized solidified soil performance and lagging material development: Fluidized solidified soil erosion repair technology is still in its early stages. Its material development and performance evaluation mainly rely on traditional concrete testing methods, which cannot meet the comprehensive performance requirements of solidified soil in the complex marine environment, namely "high fluidity → anti-dispersion → anti-erosion". At the same time, considering the wind-wave-current-wind turbine coupling effect faced by deep-sea wind turbines, traditional single-load performance testing cannot reflect the stress and failure law of solidified soil in the real service environment. As a result, the developed fluidized solidified soil materials often fail to meet the repair needs of long-term service cycles of offshore wind turbines and large-scale erosion pits (25m in diameter and 7m in depth), thus restricting the large-scale application of fluidized solidified soil in erosion repair.

[0005] 2. Lack of systematic testing and control during on-site construction leads to unstable remediation quality: Throughout the entire construction process of fluidized solidified soil, from raw material mixing and stirring to pumping to the seabed for remediation, its properties (such as fluidity, strength velocity, and erosion resistance) are easily affected by the marine environment (ocean currents, tides) and construction parameters (mixing speed, delivery pressure), causing fluctuations. However, existing construction techniques largely rely on engineering experience and lack a systematic on-site testing and control system. This results in the solidified soil delivered to the seabed failing to meet performance standards, which can range from affecting the erosion remediation effect to requiring rework, increasing project costs and safety risks.

[0006] In addition, there is a disconnect between indoor performance testing and on-site construction inspection in traditional offshore wind turbine foundation scour repair technology: indoor testing cannot guide the optimization of on-site construction parameters, and on-site inspection is difficult to provide feedback to indoor material research and development, resulting in a lack of technical closed loop, which further exacerbates the application limitations of fluidized solidified soil scour repair technology. Summary of the Invention

[0007] This invention proposes a construction equipment and process for scour repair of offshore wind turbine foundations using fluidized solidified soil. This equipment is a complete technical system encompassing "integrated performance testing, real-time on-site construction monitoring, and coupled simulation of complex environments," effectively solving the dual problems of lagging research and development of fluidized solidified soil materials and insufficient on-site quality control, thus ensuring the safety and reliability of offshore wind turbine foundation scour repair projects. Specifically, the technical solution of this invention is as follows.

[0008] First, this invention discloses a construction equipment for repairing scoured offshore wind turbine foundations using fluidized solidified soil, comprising: a waterborne transport carrier and, mounted on the carrier, a material mixing tank, a water-adding and mixing tank, a material conveying pipeline, a material conveying pump, a slurry conveying mechanism, a fluidized solidified soil scour performance testing device, a solidified soil rotational rheometer, a flowability testing platform, a detection and sampling mechanism, and a control center. Specifically, the material mixing tank and the water-adding and mixing tank are arranged side-by-side and connected by the material conveying pipeline, on which the material pump is installed to transport materials from the material mixing tank to the water-adding and mixing tank. The slurry conveying mechanism is located on one side of the water-adding and mixing tank and connected to it, allowing the fluidized solidified soil to be pumped to the seabed for repairing the scoured areas. The fluidized solidified soil scour performance testing device, the solidified soil rotational rheometer, the flowability testing platform, and the detection and sampling mechanism are all located at one end of the water-adding and mixing tank, used to test various performance indicators of the fluidized solidified soil in the water-adding and mixing tank. The control center is connected to at least the material pump, the slurry conveying mechanism, the fluidized solidified soil erosion performance testing device, the solidified soil rotational rheometer, the flowability test bench, and the detection and material handling mechanism, and is used to receive signal feedback from these devices and send signal commands to these devices.

[0009] Furthermore, both the material mixing tank and the water mixing tank are equipped with a stirring mechanism for mixing the raw materials.

[0010] Furthermore, the construction equipment also includes a raw material feeding mechanism, which is located at one end of the material mixing tank and is used to feed the raw materials for preparing the fluidized solidified soil into the material mixing tank.

[0011] Furthermore, the waterborne transport vehicle is also equipped with a cleaning mechanism for cleaning the material mixing tank, water addition and stirring tank, etc.

[0012] Further, the slurry conveying mechanism includes: a support frame, a first folding arm, a second folding arm, a first hydraulic cylinder, a second hydraulic cylinder, a pumping pipe, a material conveying pipe, and a slurry conveying pump. Specifically: the tail end of the first folding arm is rotatably connected to the support frame, and the head end of the first folding arm is hinged to the tail end of the second folding arm. The first hydraulic cylinder is located below the first folding arm, and its bottom end and telescopic rod are rotatably connected to the support frame and the first folding arm, respectively. The bottom end and telescopic rod of the second hydraulic cylinder are rotatably connected to the first folding arm and the second folding arm, respectively. The pumping pipe is arranged along the direction of the first and second folding arms, and one end of the pumping pipe is connected to the material conveying pipe, while the other end of the material conveying pipe is connected to the water mixing tank. The slurry conveying pump is mounted on the material conveying pipe.

[0013] Secondly, this invention discloses a construction process for repairing scour of offshore wind turbine foundations using fluidized solidified soil, comprising the following steps: (1) The construction equipment is transported as a whole to the predetermined water surface position by the water transport vehicle. Then, the raw materials for preparing the fluidized solidified soil slurry are added to the material mixing tank and stirred evenly to obtain a mixture. Then, the mixture is transported to the water mixing tank by the material conveying pipeline and the material conveying pump, and water is added to it for stirring to prepare the fluidized solidified soil slurry. After the sensor in the water mixing tank detects that the slurry has reached a uniform state, it sends a signal to the control center and stops stirring at the same time.

[0014] (2) The control center sends instructions to the fluidized solidified soil scour performance testing device, solidified soil rotational rheometer, fluidity test bench and detection and material collection mechanism to start working. The detection and material collection mechanism collects slurry from the water mixing tank and adds it to the fluidized solidified soil scour performance testing device, solidified soil rotational rheometer and fluidity test bench for various tests.

[0015] (3) The preparation of the fluidized solidified soil slurry is guided by a "single-item elimination + multiple verification" mechanism: Single elimination: When the test result of any one of the above tests fails to meet its corresponding "qualified standard", this test will be terminated immediately. At this time, the control center instructs the water-adding and stirring tank to continue stirring. After completion, a sample is taken again for testing until the test result of each item in the above tests meets its "qualified standard", and this round of testing is completed.

[0016] Multiple verifications: When this round of testing is completed, instead of immediately pumping the fluidized solidified soil slurry in the water-adding and stirring tank, samples are randomly taken for the next round of testing, and the single elimination mechanism described above is followed during the testing process. It is considered that the performance of the fluidized solidified soil slurry in the water-adding and stirring tank is qualified only after multiple rounds of testing are all qualified.

[0017] (4) The control center sends a start instruction to the slurry conveying mechanism to pump the fluidized solidified soil slurry in the water-adding and stirring tank to the bottom of the fan for repair.

[0018] Further, in step (3), the tests include: the anti-dispersion test conducted by the fluidized solidified soil erosion performance test device, the fluidity test conducted by the solidified soil rotational rheometer, and the rheological property test conducted by the fluidity test bench.

[0019] Further, the "qualified standard" requirement for the anti-dispersion property is: the anti-dispersion rate ≥ 92%.

[0020] Further, the "qualified standard" requirement for the fluidity is: 450mm ≤ expansion diameter (d) < 600mm.

[0021] Further, the "qualified standard" requirements for the rheological property include: 75Pa ≤ yield strength (τ0) ≤ 150Pa, 15Pa·s ≤ plastic viscosity (η) ≤ 35Pa·s. The two indexes τ0 and η must be both qualified to be judged as qualified rheological property. If any one of the indexes is unqualified, it is regarded as unqualified rheological property.

[0022] Further, the construction process also includes the step of cleaning the device. For example, after the fluidized solidified soil erosion performance test device, the solidified soil rotational rheometer, the fluidity test bench, and the detection and sampling mechanism complete their work, they are cleaned to remove the residual slurry for subsequent use.

[0023] Compared with the prior art, the present invention has at least the following beneficial technical effects: (1) The construction equipment and method of the present invention cover construction preparation, raw material mixing, standard testing, and construction repair steps, which can ensure that the performance of the fluidized solidified soil meets the standards before being pumped to the seabed for repair, realizing the safety, precision and efficiency of the scour repair of offshore wind turbine foundations, and providing technical support for the long-term safe service of offshore wind turbine foundations. The automated and standardized online detection and closed-loop system for the performance of fluidized solidified soil embedded in the construction process constructed by the present invention effectively ensures that the pumped repair material can well meet the preset performance indicators.

[0024] (2) Unlike traditional experience-based construction, this invention proposes a "single-item elimination + multiple verification" mechanism to guide the preparation of fluidized solidified soil slurry, achieving a leap from qualitative judgment to quantitative control, fundamentally eliminating the problem of unqualified materials flowing into the construction process. The complete technical system of this invention, covering "integrated performance testing - real-time on-site construction detection - complex environment coupled simulation", effectively solves the dual problems of lagging research and development of fluidized solidified soil materials and insufficient on-site repair quality control, ensuring the safety and reliability of offshore wind turbine foundation scour repair projects. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a front view of the construction equipment for the fluidized solidified soil repair of offshore wind turbine foundations in the following embodiments.

[0027] Figure 2 This is a partial top view of the construction equipment for the fluidized solidified soil repair of offshore wind turbine foundations in the following embodiments.

[0028] Figure 3 The following is a schematic diagram of the slurry conveying mechanism in the embodiments below.

[0029] Figure 4 The following is a schematic diagram of the detection and material handling mechanism in the embodiments below.

[0030] Figure 5 This is a front view of the scour performance testing device for fluidized solidified soil in the following embodiments.

[0031] Figure 6 This is a front view of the rotational rheometer for solidified soil in the following embodiments.

[0032] Figure 7 This is a top view of the rotational rheometer for solidified soil in the following embodiments.

[0033] Figure 8 The following is a front view of the flowability test bench in the embodiments below.

[0034] The markings in the above diagrams represent: 1. Waterborne transport vehicle; 2. Material mixing tank; 3. Water addition and mixing tank; 4. Material conveying pipeline; 5. Material conveying pump; 6. Slurry conveying mechanism; 7. Fluidized solidified soil erosion performance testing device; 8. Solidified soil rotational rheometer; 9. Flowability test bench; 10. Detection and material handling mechanism; 11. Control center; 12. Mixing mechanism; 13. Raw material feeding mechanism; 14. Cleaning mechanism; 15. Power supply box; 6-1. Support frame; 6-2. First folding arm; 6-3. Second folding arm; 6-4. First hydraulic cylinder; 6-5. Second hydraulic cylinder; 6-6. Pumping pipeline; 6-7. Material conveying connecting pipe; 6-8. Slurry conveying pump; 7-1. Transparent erosion tank; 7-2. Circulating water pump; 7-3. Circulating pipeline; 7-4. Valve; 7-5. Water tank; 8-1. Bottomless standard conical cylinder; 8-2. Graduated dial; 9-1. Test chamber. Detailed Implementation

[0035] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] For ease of description, the terms "up," "down," "left," and "right" appearing in this invention only indicate that they correspond to the up, down, left, and right directions in the accompanying drawings. They do not limit the structure and are merely for the purpose of describing the invention and simplifying the description. They do not indicate or imply that the equipment or components referred to need to have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates a construction equipment and construction process for fluidized solidified soil for scour repair of offshore wind turbine foundations according to the present invention.

[0038] refer to Figure 1 , Figure 2 Example: A construction equipment for scour repair of offshore wind turbine foundations using fluidized solidified soil includes: a water transport vehicle 1, a material mixing tank 2, a water addition and mixing tank 3, a material conveying pipeline 4, a material conveying pump 5, a slurry conveying mechanism 6, a fluidized solidified soil scour performance testing device 7, a solidified soil rotational rheometer 8, a flowability testing platform 9, a detection and material handling mechanism 10, and a control center 11. Specifically: The waterborne transport vehicle 1 can be a large ship. The material mixing tank 2 and the water mixing tank 3 are arranged side by side on the deck of the ship. The material mixing tank 2 and the water mixing tank 3 are connected by a material conveying pipe 4. The material conveying pipe 4 is equipped with a material conveying pump 5. One end of the material conveying pipe 4 is located at the bottom of the material mixing tank 2, and the other end is located in the water mixing tank 3. The material conveying pump 5 is used to transport the raw materials for preparing fluidized solidified soil added to the material mixing tank 2 to the water mixing tank 3. After adding water, the mixture is stirred to form a fluidized solidified soil slurry. For this purpose, both the material mixing tank 2 and the water mixing tank 3 are equipped with a stirring mechanism 12.

[0039] The slurry conveying mechanism 6 is located on one side of the water mixing tank 3 and connected to it, so as to pump the fluidized solidified soil in the water mixing tank 3 to the seabed for repair of the eroded area. In this embodiment, there are two sets of slurry conveying mechanisms 6, which are respectively located on both sides of the water mixing tank 3 and near the edge of the waterborne transport vehicle 1. Specifically, refer to... Figure 3 The slurry conveying mechanism 6 includes: a support frame 6-1, a first folding arm 6-2, a second folding arm 6-3, a first hydraulic cylinder 6-4, a second hydraulic cylinder 6-5, a pumping pipe 6-6, a material conveying connecting pipe 6-7, and a slurry conveying pump 6-8. Specifically: the tail end of the first folding arm 6-2 is rotatably connected to the support frame 6-1, and the head end of the first folding arm 6-2 is hinged to the tail end of the second folding arm 6-3, allowing them to rotate relative to each other. The first hydraulic cylinder 6-4 is located below the first folding arm 6-2, and its bottom end and telescopic rod are rotatably connected to the support frame 6-1 and the first folding arm 6-2, respectively. The second hydraulic cylinder 6-5 is located between the first folding arm 6-2 and the second folding arm 6-3, and the bottom end and telescopic rod of the second hydraulic cylinder 6-5 are rotatably connected to the first folding arm 6-2 and the second folding arm 6-3, respectively. Thus, the extension and folding of the first folding arm 6-2 and the second folding arm 6-3 are achieved by the extension and retraction of the first hydraulic cylinder 6-4 and the second hydraulic cylinder 6-5. The pumping pipe 6-6 is arranged along the direction of the first folding arm 6-2 and the second folding arm 6-3, and one end of the pumping pipe 6-6 is connected to the material conveying pipe 6-7. The other end of the material conveying pipe 6-7 is connected to the water-adding mixing tank 3. The slurry conveying pump 6-8 is arranged on the material conveying pipe 6-7 so as to convey the slurry in the water-adding mixing tank 3 to the pumping pipe 6-6, and then convey it to a preset underwater position through the pumping pipe 6-6.

[0040] The fluidized solidified soil scour performance testing device 7, the solidified soil rotational rheometer 8, and the flowability test bench 9 are all located at one end of the water-mixing tank 3, and are used to test various performance indicators of the fluidized solidified soil in the water-mixing tank 3. Specifically, the fluidized solidified soil scour performance testing device 7 performs anti-dispersion testing, the solidified soil rotational rheometer 8 performs flowability testing, and the flowability test bench 9 performs rheological performance testing. The detection and material collection mechanism 10 is located between the water-mixing tank 3 and the performance testing device (including the fluidized solidified soil scour performance testing device 7, the solidified soil rotational rheometer 8, and the flowability test bench 9), and is used to collect the slurry in the water-mixing tank 3 and add it to the performance testing device for testing; the detection and material collection mechanism 10 can be a robotic arm or other equipment, such as... Figure 4 As shown.

[0041] The control center 11 is located on the deck of the ship. The control center 11 is connected to at least the material pump 5, the slurry conveying mechanism 6, the fluidized solidified soil erosion performance testing device 7, the solidified soil rotational rheometer 8, the flowability test bench 9, and the detection and material taking mechanism 10. It is used to receive signal feedback from these devices and to send signal commands to these devices.

[0042] In another implementation, refer to Figure 2 The offshore wind turbine foundation scour repair fluidized solid soil construction equipment of the above embodiment also includes a raw material feeding mechanism 13, which is set on the water transport carrier 1 and adjacent to the material mixing tank 2, so as to feed the raw materials used to prepare fluidized solid soil into the material mixing tank 2. Specifically, the raw material feeding mechanism 13 can be an excavator or other equipment.

[0043] In another implementation, refer to Figure 2 The offshore wind turbine foundation scour repair fluidized solidified soil construction equipment in the above embodiment also includes a cleaning mechanism 14, such as a cleaning gun, for cleaning the material mixing tank 2, water mixing tank 3, fluidized solidified soil scour performance testing device 7, solidified soil rotational rheometer 8, flowability test bench 9, and detection and material taking mechanism 10.

[0044] In another embodiment, an example of a construction process based on the above-mentioned offshore wind turbine foundation scour repair fluidized solidified soil construction device includes the following steps: (1) After the construction equipment is transported to the predetermined water surface position by the water transport vehicle 1, it is anchored to ensure the stability of the water transport vehicle 1. Then, after checking each piece of equipment to ensure that it can work normally, the raw materials (including cement, silica fume, cellulose, etc.) used to prepare the fluidized solidified soil slurry are added to the material mixing tank 2 in proportion by the raw material feeding mechanism 13, and the stirring mechanism 12 is started to stir the raw materials evenly. After the set stirring time is reached, the stirring work is stopped to obtain the mixture.

[0045] (2) At this time, the sensor on the stirring mechanism 12 in the material mixing tank 2 sends a signal to the control center 11. The control center 11 sends a start command to the feed pump 5, and then the mixture in the material mixing tank 2 is transported to the water mixing tank 3 through the feed pipe 4. Then, water of a set proportion is added to it through the water supply pipe and stirred by the stirring mechanism 12. After the sensor in the water mixing tank 3 detects that the slurry has reached a uniform state, it sends a signal to the control center 11 and stops stirring.

[0046] (3) The control center 11 sends instructions to the fluidized solidified soil scour performance testing device 7, the solidified soil rotational rheometer 8, the flowability test bench 9, and the detection and material collection mechanism 10 to start working. First, the detection and material collection mechanism 10 collects slurry from the water mixing tank 3, and then adds it to the fluidized solidified soil scour performance testing device 7, the solidified soil rotational rheometer 8, and the flowability test bench 9 respectively to test various performance indicators, including: (I) the anti-dispersion test performed by the fluidized solidified soil scour performance testing device 7; (II) the flowability test performed by the solidified soil rotational rheometer 8; and (III) the rheological performance test performed by the flowability test bench 9.

[0047] Specifically, this embodiment employs a "single-item elimination + multiple verification" detection mechanism to guide the preparation of fluidized solidified soil slurry: Single-item elimination: If the result of any of the above three tests fails to meet its corresponding "pass standard", the test will be terminated immediately. At this time, the control center 11 instructs the water mixing tank 3 to continue mixing. After completion, samples are taken again for testing until the result of each of the above three tests meets its "pass standard", and the test is completed.

[0048] Multiple verifications: After the current round of testing is completed, the fluidized solidified soil slurry in the water-mixing tank 3 is not immediately pumped. Instead, random sampling continues for the next round of testing, following the single-item elimination mechanism described above. The performance of the fluidized solidified soil slurry in the water-mixing tank 3 is deemed qualified only after multiple rounds (e.g., 5 rounds) of testing have all passed.

[0049] In this embodiment, the anti-dispersion property is used to measure the anti-dispersion ability of the fluidized solidified soil slurry during underwater casting. Specifically, this embodiment employs the following... Figure 5 The fluidized solidified soil scour performance testing device 7 shown is used for anti-dispersion testing: First, the collected slurry sample is loaded into the transparent scour tank 7-1 of the fluidized solidified soil scour performance testing device 7 using the detection and material handling mechanism 10 (such as a robotic arm). Then, the circulating water pump 7-2 and the valve 7-4 on the circulating pipe 7-3 are started. Simulated seawater in the water tank 7-5 is continuously fed into the transparent scour tank 7-1 at a constant flow rate through the circulating water pump 7-2 and the circulating pipe 7-3, continuously scourting the slurry sample. After scourting, the suspended particles in the water are collected, filtered, dried, and weighed. Then, the anti-dispersion rate is calculated (the calculation formula is: (initial mass of slurry sample - mass of suspended matter) / initial mass of slurry sample). In this embodiment, the "qualified standard" for anti-dispersion is ≥92%. This ensures that under ocean current scour conditions, most of the fluidized solidified soil slurry can stably settle into the scour pit instead of being carried away by the water flow, thereby achieving precise remediation and protecting the marine environment. If the anti-dispersion test value does not meet the above requirements, it is judged as "unqualified" and the stirring command is triggered.

[0050] In this embodiment, the fluidity is used to measure the pumpability and self-leveling ability of the fluidized solidified soil slurry. The test employs a modified slump spread method, including: the sampling mechanism 10 loading the collected slurry sample into the solidified soil rotational rheometer 8 (e.g., ...). Figure 6 and Figure 7 Inside a bottomless standard conical cylinder 8-1 (upper opening φ100mm, lower opening φ200mm, height 300mm), as shown, the bottomless standard conical cylinder 8-1 is placed at the center of a graduated dial 8-2, which has several concentric circles representing different diameters around its center. Then, the bottomless standard conical cylinder 8-1 is vertically lifted, and the natural expansion diameter of the solidified soil slurry on the graduated dial 8-2 is measured. The "qualified standard" for fluidity is: 450mm ≤ expansion diameter (d) < 600mm. An expansion diameter < 450mm indicates too high viscosity, which can easily lead to excessive pumping resistance or pipe blockage; a diameter > 600mm is prone to segregation or decreased anti-dispersion ability. The solidified soil rotational rheometer 8 transmits the measurement data to the control center 11 in real time. If the fluidity test value is not within the above range, it is judged as "unqualified," triggering a continued stirring command.

[0051] In this embodiment, the rheological properties are used to measure the structural stability and workability of the fluidized solidified soil slurry. Specifically, this embodiment employs the following... Figure 8The flowability test bench 9 (commercially available products can be used) is used for rheological performance testing. The sampling mechanism 10 loads the collected slurry sample into the test chamber 9-1 of the flowability test bench 9, and uses a concentric cylinder test mode to measure the rheological curve of the material under a set shear rate program. The "qualified standard" for the rheological performance includes: 75Pa ≤ yield strength (τ0) ≤ 150Pa, 15Pa·s ≤ plastic viscosity (η) ≤ 35Pa·s. Among them, when τ0 is too low (<75Pa), the fluidized solidified soil slurry is prone to sedimentation and segregation in a static state; when τ0 is too high (>150Pa), the fluidized solidified soil slurry is difficult to pump. Plastic viscosity (η) reflects the internal frictional resistance of the fluidized solidified soil slurry during flow. η within the above range can ensure that the fluidized solidified soil slurry flows smoothly in the pipeline under pumping pressure, and can quickly stand up and resist secondary scouring by ocean currents after reaching the seabed. It should be noted that both of the above indicators (τ0, η) must be qualified at the same time to be judged as having qualified rheological performance. If either indicator is unqualified, the rheological performance is considered unqualified.

[0052] (4) After all properties of the fluidized solidified soil slurry in the water-mixing tank 3 are qualified, the control center 11 sends a start command to the slurry conveying mechanism 6 to pump the fluidized solidified soil slurry in the water-mixing tank 3 to the bottom of the underwater blower for repair. During the pumping process, the slurry conveying mechanism 6 can also be used to change direction and extend and retract to pump the fluidized solidified soil slurry to the predetermined position more accurately and flexibly.

[0053] In another embodiment, the construction process of the above embodiments also includes a step of cleaning each device using the cleaning mechanism 14. For example, after the fluidized solidified soil scour performance testing device 7, the solidified soil rotational rheometer 8, the flowability test bench 9, and the detection and material collection mechanism 10 have completed their work, they are cleaned to remove residual slurry for subsequent use. In addition, each electrical device in the above embodiments is powered by a power supply box 15 installed on the water transport carrier 1.

[0054] Finally, it should be noted that any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention. Although specific embodiments of this invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this invention are still within the scope of protection of this invention.

Claims

1. A construction equipment for repairing fluidized solidified soil in offshore wind turbine foundation scour, characterized in that, include: The waterborne transport vehicle and the following components installed on it: a material mixing tank, a water addition and stirring tank, a material conveying pipeline, a material conveying pump, a slurry conveying mechanism, a fluidized solidified soil erosion performance testing device, a solidified soil rotational rheometer, a flowability testing platform, a material sampling and inspection mechanism, and a control center; wherein: The material mixing tank and the water addition and stirring tank are arranged side by side and connected by the material conveying pipe, on which the material conveying pump is installed; The slurry conveying mechanism is located on one side of the water mixing tank and the two are connected; The fluidized solidified soil erosion performance testing device, solidified soil rotational rheometer, fluidity test bench, and detection and sampling mechanism are all located at one end of the water-adding and mixing tank. The control center is connected to at least the material pump, the slurry conveying mechanism, the fluidized solidified soil erosion performance testing device, the solidified soil rotational rheometer, the fluidity test bench, and the detection and material collection mechanism.

2. The construction equipment for repairing fluidized solidified soil of offshore wind turbine foundations according to claim 1, characterized in that, Both the material mixing tank and the water addition and stirring tank are equipped with stirring mechanisms.

3. The construction equipment for repairing fluidized solidified soil of offshore wind turbine foundations according to claim 1, characterized in that, It also includes a raw material feeding mechanism, which is located at one end of the material mixing tank; or, the construction equipment also includes a cleaning mechanism.

4. The construction equipment for repairing fluidized solidified soil for offshore wind turbine foundation scour according to any one of claims 1-3, characterized in that, The slurry conveying mechanism includes: a support frame, a first folding arm, a second folding arm, a first hydraulic cylinder, a second hydraulic cylinder, a pumping pipe, a material conveying pipe, and a slurry conveying pump; wherein: the tail end of the first folding arm is rotatably connected to the support frame, and the head end of the first folding arm is hinged to the tail end of the second folding arm; the first hydraulic cylinder is located below the first folding arm, and its bottom end and telescopic rod are rotatably connected to the support frame and the first folding arm, respectively; the bottom end and telescopic rod of the second hydraulic cylinder are rotatably connected to the first folding arm and the second folding arm, respectively; the pumping pipe is arranged along the direction of the first folding arm and the second folding arm, and one end of the pumping pipe is connected to the material conveying pipe, the other end of the material conveying pipe is connected to the water mixing tank, and the slurry conveying pump is mounted on the material conveying pipe.

5. A construction process for repairing scour of offshore wind turbine foundations using fluidized solidified soil, characterized in that... The process is performed using the construction equipment described in any one of claims 1-4, and includes the following steps: S1. The construction equipment is transported to the predetermined water surface position by the water transport carrier; then, the raw materials for preparing the fluidized solidified soil slurry are added to the material mixing tank and stirred evenly to obtain a mixture; then, the mixture is transported to the water mixing tank by the material conveying pipeline and the material conveying pump, and water is added to it for stirring to prepare the fluidized solidified soil slurry. After the sensor in the water mixing tank detects that the slurry has reached a uniform state, it sends a signal to the control center and stops stirring at the same time. S2. The control center sends instructions to the fluidized solidified soil erosion performance testing device, solidified soil rotational rheometer, flowability test bench, and detection and material collection mechanism to start working. The detection and material collection mechanism collects slurry from the water-adding and mixing tank and adds it to the fluidized solidified soil erosion performance testing device, solidified soil rotational rheometer, and flowability test bench for various tests. S3. A single-item elimination and multiple verification mechanism is adopted to guide the preparation of the fluidized solidified soil slurry: Single-item elimination: If the test result of any of the above tests fails to meet its corresponding pass standard, the test shall be terminated immediately. At this time, the control center shall instruct the water mixing tank to continue mixing. After completion, samples shall be taken again for testing until the test result of each of the above tests meets its pass standard, and the test shall be completed. Multiple verifications: After the current round of testing is completed, the fluidized solidified soil slurry in the water-mixing tank is not immediately pumped. Instead, random sampling is continued for the next round of testing, and the single-item elimination mechanism mentioned above is followed during the testing process. The performance of the fluidized solidified soil slurry in the water-mixing tank is deemed qualified only after multiple rounds of testing have passed. S4. The control center sends a start command to the slurry conveying mechanism to pump the fluidized solidified soil slurry in the water mixing tank to the bottom of the blower for repair.

6. The construction process of fluidized solidified soil for scour repair of offshore wind turbine foundations according to claim 5, characterized in that, In step S3, the tests include: the anti-dispersion test performed by the fluidized solidified soil scour performance testing device, the flowability test performed by the solidified soil rotational rheometer, and the rheological performance test performed by the flowability test bench.

7. The construction process for fluidized solidified soil repair of offshore wind turbine foundations according to claim 6, characterized in that, The pass standard for anti-dispersion is: anti-dispersion rate ≥ 92%.

8. The construction process for fluidized solidified soil repair of offshore wind turbine foundation scour according to claim 6, characterized in that, The acceptable flowability standard is: 450mm ≤ expansion diameter < 600mm.

9. The construction process of fluidized solidified soil for scour repair of offshore wind turbine foundations according to claim 6, characterized in that, The qualification requirements for rheological properties include: 75Pa≤yield strength≤150Pa, 15Pa·s≤plastic viscosity≤35Pa·s; both yield strength and plastic viscosity must be qualified for the rheological properties to be deemed qualified. If either indicator fails to meet the requirements, the rheological properties are considered unqualified.

10. The construction process of fluidized solidified soil for scour repair of offshore wind turbine foundations according to claim 5, characterized in that, The construction process also includes a step of cleaning the device.

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