Equipment and Method for Preparing Horizontal Two-Dimensional Oriented Steel Fiber UHPC Wind Turbine Tower Ring Plates

Abstract

This invention discloses a device and method for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings, relating to the field of wind turbine tower engineering technology. The device mainly consists of an annular mold, an annular slide rail, an electric slider, coils, and a DC power supply. The DC power supply powers the inner and outer coils, generating a uniform and controllable magnetic field. The coils are driven by the electric slider to achieve synchronous circumferential rotation. The magnetic field strength and application time are adjusted according to the different flowability of the UHPC mixture, causing the steel fibers to form a two-dimensional distribution in the horizontal plane under the action of the rotating magnetic field. The horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine towers produced by this device have a 15%-20% increase in compressive load-bearing capacity and a 40%-50% increase in compressive fatigue performance compared to traditional UHPC wind turbine towers. This tower structure can reduce the thickness of the tower ring sections by 10%-20%, reducing the tower's self-weight and raw material consumption, and reducing transportation and construction costs. The device has a simple design, is easy to assemble and disassemble, and has the potential for efficient and reliable industrial production, and can be widely used in the manufacturing and optimization of wind turbine towers.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower engineering technology, and in particular to a device and method for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates. Background Technology

[0002] With the rapid development of the global wind energy industry, especially the rapid expansion of offshore and large-scale onshore wind power projects, higher requirements have been placed on the height and load-bearing capacity of wind turbine towers. Traditional steel-structured wind turbine towers are gradually showing limitations due to material costs, transportation restrictions, and the structural complexity required for taller towers. Concrete wind turbine towers offer many unique advantages over steel towers, including lower cost, convenient and efficient transportation and construction, and higher stability and durability. However, with the increasing height and size of wind turbine towers, ordinary concrete towers are also experiencing a series of problems, such as high concrete consumption, heavy weight, susceptibility to fatigue failure, and insufficient load-bearing capacity.

[0003] To address the aforementioned issues, Zhang Lili proposed a novel tower structure in "Research on Wind Vibration Performance of Hollow Sandwich Steel-Concrete Composite Wind Turbine Tower [D]. Lanzhou University of Technology, 2022.000920," specifically disclosing a hollow sandwich steel-concrete composite tower. This composite component exhibits higher bending stiffness and better stability due to the coordinated and complementary effects of the inner and outer steel pipes and the sandwich concrete. However, the fabrication process for this structure is cumbersome, requires high technical standards, and the results are not ideal. Pang Kun proposed encasing the tower with UHPC-enhanced steel-concrete transition section in "Research on Static and Fatigue Performance of UHPC-Enhanced Wind Turbine Tower [D]. Chongqing Jiaotong University, 2024," suggesting that encasing the tower with UHPC can improve its static and fatigue performance. However, this method is only suitable for local reinforcement and not for large-scale application. "Zhang Xuesen, Wu Xiangguo, Li Dan, et al. Static and fatigue performance of prefabricated UHPC wind turbine towers under rated wind speed [J] Renewable Energy, 2022, 40(08): 1066-1072." proposed using UHPC to prepare wind turbine towers. The addition of steel fibers inside UHPC can greatly improve the tower's load-bearing capacity and fatigue performance. However, the fibers in the ring plates of traditional UHPC towers are randomly distributed, and not all fibers play a reinforcing role, which will lead to material waste and increase construction costs.

[0004] Based on the stress characteristics of wind turbine towers, the tower is under pressure due to the prestressed steel reinforcement. Therefore, the steel fibers are adjusted to a horizontal two-dimensional distribution, with all steel fibers randomly distributed perpendicular to the compressive load. The horizontal two-dimensional oriented distribution of steel fibers is perpendicular to the direction of the compressive load, which can provide higher crack resistance and toughness, thereby effectively inhibiting the initiation and propagation of cracks, improving fiber reinforcement efficiency, and significantly improving the mechanical properties of the tower.

[0005] Currently, fiber orientation methods mainly include magnetic field orientation, flow-induced orientation, and 3D printing equipment orientation. Previous studies, based on electromagnetic principles, have successfully prepared unidirectional oriented steel fiber reinforced cement composites, two-dimensionally distributed steel fiber reinforced cement composites, and fully aligned steel fiber reinforced cement composites, maximizing fiber reinforcement efficiency and significantly improving the mechanical properties of steel fiber reinforced cement composites. However, these methods are mostly in the experimental research stage, and their orientation equipment is not suitable for actual industrial production. There is an urgent need to invent a horizontally two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring preparation device and method suitable for practical production. Summary of the Invention

[0006] The purpose of this invention is to provide a horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring preparation device to solve the problems mentioned in the background art. The horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring prepared by this invention has internal steel fibers that are randomly distributed perpendicular to the compressive load, providing higher crack resistance and toughness, thereby effectively inhibiting crack initiation and propagation, improving fiber reinforcement efficiency, maximizing tower deformation limitation, and significantly improving the tower's load-bearing capacity.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] A device for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates includes an annular mold, an annular slide rail, an electric slider, a coil, and a DC power supply;

[0009] The annular mold includes an outer ring and an inner ring;

[0010] The annular slide rail includes an outer slide rail and an inner slide rail. The outer slide rail is located on the outer side of the outer ring, and the inner slide rail is located on the inner side of the inner ring.

[0011] The electric slider includes an outer slider and an inner slider, the outer slider being slidably mounted on an outer slide rail, and the inner slider being slidably mounted on an inner slide rail;

[0012] The coil includes an outer coil and an inner coil, which are respectively disposed on the outer slider and the inner slider;

[0013] The DC power supply is electrically connected to the coil.

[0014] Preferably, the annular mold, annular slide rail, and electric slider are made of non-magnetic materials, and the connection between the annular mold, annular slide rail, and coil is provided with threaded holes and is fixedly connected by bolts.

[0015] Preferably, the rotational speed of the electric slider is adjustable in the range of 5 to 20 seconds per revolution; when the outer slider and the inner slider rotate, they rotate synchronously with their corresponding outer coil and inner coil.

[0016] Preferably, the outer coil and the inner coil have the same number of turns, wherein the number of turns ranges from 100 to 500, the coil height is from 0.5 to 1.5 m, and the coil width is from 0.5 to 1.5 m; the outer coil and the inner coil are positioned in a front-to-back correspondence, and the coil wire is made of insulating plated conductive wire wound together, wherein the insulating plated conductive wire is a copper wire with a diameter of 0.5 to 2.2 mm and its surface is coated with an insulating layer.

[0017] Preferably, the DC power supply is used to adjust the voltage and current. The DC power supply has three adjustment knobs (a, b, and c) to adjust the voltage, current, and magnetic field duration, respectively. After the coil is connected to the DC power supply, a uniform magnetic field is generated. Based on the different flowability and viscous resistance of the UHPC mixture, the magnetic field strength and duration are adjusted to control the fiber orientation, specifically including the following:

[0018] The magnetic flux density inside a current-carrying solenoid is calculated based on the Biot-Savart law. The specific formula is as follows:

[0019] B = μ0NI

[0020] In the formula, B represents the magnetic induction intensity, μ0 represents the free permeability, N represents the number of turns of the external coil of the energized solenoid, and I represents the current in the closed loop of the energized solenoid.

[0021] The magnetic field strength can be controlled by controlling the magnitude of the voltage and current.

[0022] After applying a uniform magnetic field, the magnetic field provides a driving force to make the steel fiber rotate. During the rotation, viscous resistance is generated between the steel fiber and the matrix. The driving force of the magnetic field on the steel fiber overcomes the viscous resistance of the concrete, causing the steel fiber to rotate to the designed direction. The calculation formulas for the driving force of the magnetic field and the viscous resistance are as follows:

[0023]

[0024] In the formula, f1 represents the driving force of the magnetic field, f2 represents the viscous resistance, B represents the magnetic induction intensity, μ0 represents the permeability of free space, S represents the area of ​​the interaction surface between the magnetic field and the magnetically conductive material, η represents the viscosity coefficient of the viscous cement paste, l represents the length of the steel fiber; v represents the velocity of the steel fiber, l x d represents the length of the steel fiber at a distance x from the centroid of the steel fiber, and d represents the diameter of the steel fiber.

[0025] Based on the angular momentum theorem, the rotational velocity and position of the steel fiber can be calculated from the components of the magnetic force and viscous resistance acting on it. The specific calculation formula is as follows:

[0026]

[0027] In the formula, m represents the mass of the steel fiber; according to the above formula, the rotational angular acceleration of the steel fiber at time t when it overcomes the viscous resistance of the UHPC mixture with viscosity η under the action of a magnetic field with magnetic induction intensity B is calculated.

[0028] It is known that the maximum rotation angle required to orient the steel fibers in the tower ring to the horizontal direction is 90 degrees. Based on this, the time required for the steel fibers to rotate 90 degrees under a certain magnetic induction intensity can be calculated. According to the different fluidity and viscous resistance of the UHPC mixture poured on site, the magnetic field intensity and the time of action can be adjusted to control the fiber orientation.

[0029] Further protection is provided regarding the method for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates based on the above-mentioned device, including the following steps:

[0030] S1. Preparation of UHPC mixture, wherein the UHPC mixture is prepared by mixing cementitious materials, steel fibers, water-reducing agent and water in a certain proportion, wherein the cementitious materials include cement, silica fume, fly ash and mineral powder, and the steel fibers have a diameter of 0.18-0.23 mm, a length of 10-50 mm and a volume content of 1.5%-2.5%;

[0031] S2. Test the viscosity coefficient of the UHPC mixture, and calculate the required magnetic field strength and magnetic field application time based on the different flowability and viscous resistance of the UHPC mixture.

[0032] S3. Pour the freshly prepared mixture into the mold and vibrate for 15-20 seconds to ensure even internal vibration, so that the concrete surface is level with the height of the mold.

[0033] S4. Adjust the electric slider to make it rotate evenly around the slide rail. The outer and inner coils of the mold rotate synchronously and periodically under the drive of the slider.

[0034] S5. Connect the DC power supply and adjust the current to make the magnetic field induction intensity within a suitable range; vibrate the UHPC mixture to make the UHPC continuously under the action of the rotating magnetic field for a certain period of time, so that the steel fibers in the mixture rotate to the horizontal direction and are distributed in two dimensions in the horizontal plane to achieve steel fiber orientation.

[0035] S6. After achieving fiber orientation, turn off the power. After the tower ring is cured in the mold for 24 hours, remove the mold and then move the ring to the standard curing room for 28 days or steam curing for 2-3 days. The preparation of the horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring is completed.

[0036] Compared with the prior art, the present invention provides a device and method for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates, which has the following beneficial effects:

[0037] (1) This invention uses the principle of magnetic field rotation orientation to prepare horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower rings. The steel fibers are horizontally distributed in two dimensions inside the tower, which significantly improves the fiber reinforcement efficiency and enhances the mechanical properties of the tower.

[0038] (2) When the wind turbine tower is working normally, the tower is under pressure due to the prestressed steel bars. The horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower made by the present invention has steel fibers inside that are randomly distributed perpendicular to the compressive load. The horizontal two-dimensional oriented steel fibers are perpendicular to the direction of the compressive load, which can provide higher crack resistance and toughness, thereby effectively inhibiting the initiation and propagation of cracks, improving fiber reinforcement efficiency, and maximizing the limitation of tower deformation, thus significantly improving the tower bearing capacity.

[0039] (3) The horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower prepared by the present invention has a 15%-20% higher compressive bearing capacity and a 40%-50% higher compressive fatigue performance than the traditional randomly distributed steel fiber UHPC tower.

[0040] (4) The horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower obtained by the present invention can reduce the thickness of the tower ring section by 10%-20% under the same material performance requirements, thereby reducing the self-weight of the tower and the consumption of raw materials, and reducing transportation and construction costs.

[0041] (5) The horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring preparation device proposed in this invention has a simple design, is easy to disassemble and assemble, and has the potential for efficient and reliable industrial production. It can be widely used in the manufacturing and optimization of wind turbine towers. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings involved in the embodiments are now briefly described. Obviously, the drawings in the following description are merely illustrative of some embodiments of the present invention. For those skilled in the art, other forms of drawings can be constructed based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the overall structure of the horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring preparation device mentioned in the embodiments of the present invention;

[0044] Figure 2 This is a top view of the positions of the inner and outer sliders mentioned in the embodiments of the present invention;

[0045] Figure 3 This is a perspective view of the positions of the inner and outer coils mentioned in the embodiments of the present invention;

[0046] Figure 4 This is a schematic diagram of the fiber orientation principle mentioned in the embodiments of the present invention; wherein, Figure 4 (a) is a force diagram of steel fiber in a magnetic field; Figure 4 (b) is a schematic diagram of the horizontal two-dimensional orientation of steel fibers under the action of a rotating magnetic field;

[0047] Figure 5 This is a schematic diagram of a DC power supply in an embodiment of the present invention;

[0048] Figure 6 This is a cross-sectional view of the annular slide rail mentioned in the embodiments of the present invention;

[0049] Figure 7 This is a fiber distribution diagram within the horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring mentioned in the embodiments of the present invention;

[0050] Figure 8 (a) and (b) are the statistical results of the compressive strength test and fatigue test, respectively. 2D is the horizontal two-dimensional oriented UHPC specimen, and RD is the random oriented steel fiber UHPC specimen.

[0051] Explanation of the labels in the diagram:

[0052] 1. Circular mold; 101. Outer ring; 102. Inner ring; 2. Circular slide rail; 201. Outer slide rail; 202. Inner slide rail; 3. Electric slider; 301. Outer slider; 302. Inner slider; 4. Coil; 401. Outer coil; 402. Inner coil; 5. DC power supply. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and comprehensively described below with reference to the accompanying drawings. It should be noted that the embodiments described are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0054] This invention proposes a device for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings. By controlling the magnetic field strength and the duration of magnetic field action, horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower rings can be effectively prepared. Because the internal steel fibers are randomly distributed perpendicular to the compressive load, they can provide higher crack resistance and toughness, thereby effectively inhibiting the initiation and propagation of cracks, improving fiber reinforcement efficiency, maximizing the limitation of tower deformation, and significantly improving the tower's load-bearing capacity.

[0055] To make the above-mentioned objectives, features and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Example 1:

[0057] like Figure 1 As shown, this invention proposes a horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring sheet preparation device. The device mainly consists of an annular mold 1, an annular slide rail 2, an electric slider 3, a coil 4, and a DC power supply 5. The annular mold 1 includes an outer ring 101 and an inner ring 102; the annular slide rail 2 includes an outer slide rail 201 and an inner slide rail 202; the electric slider 3 includes an outer slider 301 and an inner slider 302; and the coil 4 includes an outer coil 401 and an inner coil 402.

[0058] The inner slide rail 202 and the outer slide rail 201 are respectively disposed on the inner and outer sides of the annular mold 1. The upper sides of the inner slide rail 202 and the outer slide rail 201 are flush with the upper edge of the annular mold 1, and the lower sides of the inner slide rail 202 and the outer slide rail 201 are flush with the lower edge of the annular mold 1. The inner slider 302 and the outer slider 301 are respectively installed on the inner slide rail 202 and the outer slide rail 201. The positions of the inner slider 302 and the outer slider 301 are corresponding front and back. The top view of their positions is shown below. Figure 2 As shown. Inner coil 402 and outer coil 401 are respectively provided on the inner slider 302 and outer slider 301. The positions of the inner coil 402 and outer coil 401 are parallel and corresponding, as shown. Figure 3 As shown. Coil 4, driven by the electric slider 3, can perform synchronous periodic circumferential operation. When coil 4 is connected to the DC power supply 5, it generates a uniform magnetic field and rotates at a certain speed. Under the influence of the magnetic field, it can perform horizontal two-dimensional orientation of the steel fibers inside the annular mold 1. The principle is as follows. Figure 4 As shown.

[0059] Coil 4 is made of insulating coated conductive wire wound together. Each coil 4 has the same number of turns and the height of coil 4 is consistent with the top and bottom of the ring mold 1.

[0060] The DC power supply 5 can adjust the voltage, current and duration of action via buttons, thereby controlling the magnitude of the magnetic induction intensity and the duration of the magnetic field action within the coil 4.

[0061] The electric slider 3 moves circumferentially on the annular slide rail 2, with adjustable speed and synchronous rotation. Driven by the electric slider 3, the outer coil 401 and the inner coil 402 rotate synchronously in a periodic reciprocating motion. The electric slider 3 slides within the annular slide rail 2 via rollers, and its cross-section is as follows: Figure 6 As shown. Coil 4 rotates periodically under the drive of the electric slider 3. The steel fibers within the tower ring plate exhibit a horizontal two-dimensional distribution under the influence of the rotating magnetic field, as shown... Figure 7 .

[0062] Bolts are installed at the connection points of the annular mold 1, the annular slide rail 2, and the coil 4, allowing for easy disassembly and installation. The annular mold 1, the outer slide rail 201, and the electric slider 3 are all made of non-magnetic alloy material.

[0063] The preparation of horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring plates using the above-mentioned apparatus includes the following steps:

[0064] The first step is to prepare the UHPC mixture, which is made of cementitious materials, steel fibers, water-reducing agents and water in a certain proportion. The cementitious materials include cement, silica fume, fly ash and mineral powder. The steel fibers have a diameter of 0.2 mm, a length of 13 mm and a volume content of 2%.

[0065] The second step is to test the viscosity coefficient of the UHPC mixture and calculate the required magnetic field strength and duration based on the different flowability and viscous resistance of the UHPC mixture.

[0066] The third step is to pour the fresh mixture into the ring mold 1 and vibrate it for 15-20 seconds to ensure even internal vibration, so that the concrete surface is basically level with the height of the mold.

[0067] Step 4: Adjust the electric slider 3. The electric slider 3 rotates evenly around the annular slide rail 2. The outer coil 401 and the inner coil 402 on the annular mold 1 rotate synchronously and periodically under the drive of the electric slider 3.

[0068] Step 5: Connect the DC power supply 5, adjust the current to ensure the magnetic field induction intensity is within a suitable range, and adjust the duration of the magnetic field action. Vibrate the UHPC mixture, allowing it to remain under the influence of the rotating magnetic field for a certain period of time, causing the steel fibers in the mixture to rotate to a horizontal direction and distribute in two dimensions within the horizontal plane, thus achieving steel fiber orientation.

[0069] Step 6: After achieving fiber orientation, turn off the DC power supply 5. After the tower ring is cured indoors with the mold for 24 hours, remove the mold and then move the ring to the standard curing room for 28 days or steam curing for 2-3 days. The preparation of the horizontal two-dimensional oriented steel fiber reinforced UHPC wind turbine tower ring is completed.

[0070] Based on the above, a comparative experiment was designed to conduct compressive and fatigue tests on the prepared horizontally oriented two-dimensional steel fiber reinforced UHPC and randomly oriented steel fiber UHPC materials. Specific test results are as follows: Figure 7 As shown, where, Figure 8 (a) and (b) show the statistical results of compressive strength and fatigue tests of horizontal two-dimensional oriented UHPC material (2D) and randomized steel fiber UHPC material (RD), respectively. It can be seen that the compressive strength and fatigue performance of horizontal two-dimensional oriented steel fiber UHPC are significantly improved compared to traditional UHPC.

[0071] The device produces horizontally oriented two-dimensional steel fiber reinforced UHPC wind turbine towers, which, compared to traditional randomly distributed steel fiber UHPC towers, have a 15%-20% higher compressive bearing capacity and a 40%-50% higher compressive fatigue performance. Under the same material performance requirements, the horizontally oriented two-dimensional steel fiber reinforced UHPC wind turbine tower structure can reduce the thickness of the tower ring sections by 10%-20%, reducing the tower's self-weight and raw material consumption, and decreasing transportation and construction costs.

[0072] The remaining technical features in this embodiment can be flexibly selected by those skilled in the art to meet different specific practical needs. However, it is obvious to those skilled in the art that these specific details are not necessary to implement the present invention. In other instances, to avoid obscuring the present invention, the composition, structure, or components of the formula are not specifically described, all of which are within the scope of technical protection defined by the claims of the present invention.

[0073] Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this invention should be within the protection scope of the appended claims. In the above description, numerous specific details have been set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other instances, to avoid obscuring the invention, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been specifically described.

[0074] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates, characterized in that, It includes a ring mold (1), a ring slide rail (2), an electric slider (3), a coil (4), and a DC power supply (5); The annular mold (1) includes an outer ring (101) and an inner ring (102); The annular slide rail (2) includes an outer slide rail (201) and an inner slide rail (202). The outer slide rail (201) is disposed on the outer side of the outer ring (101), and the inner slide rail (202) is disposed on the inner side of the inner ring (102). The electric slider (3) includes an outer slider (301) and an inner slider (302). The outer slider (301) is slidably mounted on the outer slide rail (201), and the inner slider (302) is slidably mounted on the inner slide rail (202). The coil (4) includes an outer coil (401) and an inner coil (402), which are respectively disposed on the outer slider (301) and the inner slider (302); the DC power supply (5) is electrically connected to the coil (4).

2. The apparatus for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings according to claim 1, characterized in that, The annular mold (1), annular slide rail (2), and electric slider (3) are made of non-magnetic materials. The connection between the annular mold (1), annular slide rail (2), and coil (4) is provided with threaded holes and is fixedly connected by bolts.

3. The apparatus for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings according to claim 1, characterized in that, The rotation speed adjustment range of the electric slider (3) is 5 to 20 seconds per revolution; when the outer slider (301) and the inner slider (302) rotate, they rotate synchronously with their corresponding outer coil (401) and inner coil (402).

4. The apparatus for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings according to claim 1, characterized in that, The outer coil (401) and the inner coil (402) have the same number of turns, wherein the number of turns ranges from 100 to 500, the coil height is 0.5 to 1.5m, and the coil width is 0.5 to 1.5m. The outer coil (401) and the inner coil (402) are positioned in a front-to-back correspondence. The coil wire is made of insulating plated conductive wire wound together. The insulating plated conductive wire is a copper wire with a diameter of 0.5 to 2.2mm and its surface is coated with an insulating layer.

5. The apparatus for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower rings according to claim 1, characterized in that, The DC power supply (5) is used to adjust the voltage and current. It includes three adjustment knobs, a, b, and c, which are used to adjust the voltage, current, and magnetic field duration, respectively. The coil (4) generates a uniform magnetic field after the DC power supply (5) is connected. According to the different flowability and viscous resistance of the UHPC mixture, the electromagnetic field intensity and duration are adjusted by the DC power supply (5) to control the fiber direction.

6. The method for preparing horizontal two-dimensional oriented steel fiber UHPC wind turbine tower ring plates by the device according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Preparation of UHPC mixture, wherein the UHPC mixture is prepared by mixing cementitious materials, steel fibers, water-reducing agent and water in a certain proportion, wherein the cementitious materials include cement, silica fume, fly ash and mineral powder, and the steel fibers have a diameter of 0.18-0.23 mm, a length of 10-50 mm and a volume content of 1.5%-2.5%; S2. Test the viscosity coefficient of the UHPC mixture, and calculate the required magnetic field strength and magnetic field application time based on the different flowability and viscous resistance of the UHPC mixture. S3. Pour the fresh mixture into the ring mold (1), vibrate for 15-20 seconds, vibrate evenly inside, and make the concrete surface level with the height of the mold. S4. Adjust the electric slider (3) to make it rotate evenly around the annular slide rail (2). The outer coil (401) and the inner coil (402) rotate synchronously and periodically under the drive of the electric slider (3). S5. Connect the DC power supply (5), adjust the current to make the magnetic field magnetic induction intensity within a suitable range, and regulate the magnetic field action time; vibrate the UHPC mixture to make the UHPC continue to be under the action of the rotating magnetic field for a certain period of time, so that the steel fibers in the mixture rotate to the horizontal direction and are distributed in two dimensions in the horizontal plane to achieve steel fiber orientation. S6. After achieving fiber orientation, turn off the DC power supply (5). After the tower ring is cured in the mold for 24 hours, remove the mold and then move the ring into the standard curing room for 28 days or steam curing for 2-3 days. The preparation of the horizontal two-dimensional oriented steel fiber reinforced UHPC wind power tower ring is completed.

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