A bimetallic composite anticorrosion prestressed anchorage device for severe environment

Abstract

The utility model provides a bimetallic composite anticorrosion prestressed anchorage device for severe environment can be applicable to the fan bearing platform anchorage device construction of high and cold area, it includes: first annular metal sheet, second annular metal sheet, it is parallel with first annular metal sheet and is arranged with interval predetermined distance in vertical direction, constitutes the main part of cylindrical structure, a plurality of anchor rods vertical through setting, upper end and lower end respectively pass through first annular metal sheet and second annular metal sheet on corresponding anchor hole and are anchored through anchoring block, anchor rod, first annular metal sheet and second annular metal sheet jointly constitute a prestressed bearing cylinder, a plurality of connecting cylinders are connected between first annular metal sheet and second annular metal sheet, wherein, after pouring concrete, the internal annular area of prestressed bearing cylinder, the central area inside prestressed bearing cylinder and the outer annular area outside prestressed bearing cylinder jointly constitute a complete, uniform stress load distribution platform.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchors, and more specifically, to a bimetallic composite anti-corrosion prestressed anchor for use in harsh environments. Background Technology

[0002] As a key piece of equipment in renewable energy, the long-term safety and stability of wind turbine foundations are of paramount importance. Traditional onshore wind turbine foundations widely employ a foundation ring connection method, which connects the turbine to the tower via a large steel ring component embedded in concrete. While this technology is mature and easy to construct, it increasingly reveals the following drawbacks in harsh geographical and climatic environments such as high altitude, drought, extreme temperature variations, and strong corrosion: 1. In seasonally frozen soil areas, repeated freezing and thawing of the foundation soil generates huge uneven uplift forces. Traditional foundation rings are rigid monolithic structures that cannot effectively adapt to or eliminate this deformation, leading to stress concentration at the junction of the ring and concrete. This can easily cause concrete cracking, ring uplift, or even tilting of the entire wind turbine, seriously threatening operational safety. 2. The foundation ring mainly relies on the bond and friction between the ring wall and the concrete for load transfer, resulting in an unclear and concentrated load transfer path. Under complex alternating loads such as wind loads and turbine vibrations, stress peaks are easily formed at the bottom of the ring, leading to concrete fatigue damage, and its ability to resist extreme overturning moments is limited. Utility Model Content

[0003] The purpose of this utility model is to provide a bimetallic composite anti-corrosion prestressed anchor for harsh environments. It is designed for wind turbine foundation construction in extreme environments such as high altitude and drought. It has strong environmental durability, extremely high structural integrity and load distribution efficiency, as well as convenient and reliable construction, thereby ensuring the safe and stable operation of the wind turbine throughout its entire life cycle.

[0004] The embodiments of this utility model are implemented as follows: A bimetallic composite corrosion-resistant prestressed anchor for harsh environments, comprising: The first annular metal sheet is made of high-strength structural steel; The second annular metal sheet is arranged in the vertical direction parallel to the first annular metal sheet and at a predetermined distance, forming the main body of the cylindrical structure. The second annular metal sheet is made of corrosion-resistant metal material. Multiple anchor rods are vertically installed, with their upper and lower ends passing through the corresponding anchor holes on the first and second annular metal plates, respectively, and anchored by anchor blocks. The anchor rods, the first annular metal plate, and the second annular metal plate together constitute a prestressed bearing cylinder. Several connecting cylinders are connected between the first annular metal sheet and the second annular metal sheet to maintain their relative position and spacing; Among them, after the prestressed bearing cylinder is poured with concrete, its internal annular area, the central area inside the prestressed bearing cylinder, and the outer annular area outside the prestressed bearing cylinder together form a complete and uniformly stressed load distribution platform.

[0005] In a preferred embodiment of the present invention, the anchor holes on the first and second annular metal sheets are distributed at equal intervals along at least two concentric circles of different diameters.

[0006] In a preferred embodiment of this utility model, the above-mentioned anchor holes are distributed along three concentric circles of different diameters to form an inner ring, a middle ring, and an outer ring of anchor holes.

[0007] In a preferred embodiment of this utility model, the connecting cylinder is one or more of a vertical cylinder, a shear key cylinder, or a uniformly distributed support cylinder.

[0008] In a preferred embodiment of the present invention, a support member connected to a second annular metal sheet is provided circumferentially at the bottom edge of the prestressed bearing cylinder, and the height of the support member is adjustable.

[0009] In a preferred embodiment of this utility model, the surface of the anchor rod is provided with an anti-corrosion coating, which is a hot-dip galvanized layer or an epoxy coating.

[0010] In a preferred embodiment of this utility model, the anchor rod and the annular metal sheet are connected by anchor blocks, and two sets of anchor blocks located on the same annular metal sheet and symmetrically distributed based on the center are also provided with self-locking mesh strips. The two sets of anchor blocks include a first anchor block and a second anchor block. The self-locking mesh strip enters from the bottom of the first and second anchor blocks, passes around the top of the second anchor block to the bottom of the first anchor block, and then passes around the top of the first anchor block to the top and bottom of the second anchor block before exiting from the starting direction of the self-locking mesh strip, thus forming a self-locking anchor block.

[0011] In a preferred embodiment of this utility model, the self-locking mesh belt is a fiber mesh belt; the anchor block is a cylindrical block.

[0012] The beneficial effects of this utility model embodiment are: 1. The bimetallic composite structure with high-strength structural steel base and corrosion-resistant metal coating solves the corrosion problem of key load-bearing components in harsh environments such as salt corrosion, freeze-thaw, and alternating wet and dry conditions, and greatly extends the service life of the anchor and the overall structure. 2. After the concrete inner ring area, central area and outer ring area of ​​the cylinder are poured and combined with the prestressed cylinder, an overall platform for steel-concrete synergy is formed. The platform is continuously stressed, which significantly avoids local stress concentration and greatly improves the fatigue resistance, crack resistance and overall stiffness of the foundation. 3. The newly added mesh strips are designed in a radial pattern, which can actively resist frost heave and inhibit warping deformation. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the frame structure of a bimetallic composite anti-corrosion prestressed anchor for harsh environments according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a bimetallic composite anti-corrosion prestressed anchor for harsh environments according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the self-locking mesh tape winding method according to an embodiment of the present invention; Icons: First annular metal sheet 1; Anchor hole 11; Second annular metal sheet 2; Anchor rod 3; Connecting cylinder 4; Anchor block 5; First anchor block 51; Second anchor block 52; Self-locking mesh strip 6; Supporting component 7. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] First Embodiment Please refer to Figure 1-3 This embodiment provides a bimetallic composite anti-corrosion prestressed anchor for harsh environments, which includes a first annular metal sheet 1, a second annular metal sheet 2, multiple anchor rods 3 passing through the first and second annular metal sheets 2, a number of connecting cylinders 4 sleeved on the anchor rods 3 and located between the first and second annular metal sheets 2, an anchoring block 5 located at the connection between the anchor rods 3 and the annular metal sheets, and a self-locking mesh strip 6 connecting the relative anchoring blocks 5.

[0022] The modular design facilitates transportation, making it particularly suitable for construction in harsh environments with poor transportation, such as high-altitude and mountainous areas. On-site work only requires hoisting and positioning the cylinder, pouring concrete, and tensioning and anchoring. The construction process is simplified, less affected by weather and human factors, which can significantly shorten the construction period of the wind turbine foundation and reduce overall costs.

[0023] The first annular metal sheet 1 is made of high-strength structural steel; the second annular metal sheet 2 is arranged parallel to the first annular metal sheet 1 in the vertical direction and at a predetermined distance, forming the main body of the cylindrical structure. The second annular metal sheet 2 is made of corrosion-resistant metal materials, such as stainless steel and aluminum alloy, which have strong corrosion resistance and low price; the second annular metal sheet 2 is located at the bottom.

[0024] Anchor bolt 3 is integrated with the double-ring metal plate to form a prestressed load-bearing cylinder. As a rigid frame, the cylinder can efficiently convert the complex loads transmitted from the superstructure into the axial and circumferential stresses of the cylinder itself, thus realizing the three-dimensional and uniform transmission of loads.

[0025] The prestressed tube provides enormous flexural stiffness and a wide distribution of pull-out anchor points, while the concrete platform provides a large overturning resistance area. Together, they significantly improve the stability and safety of the structure under extreme wind loads and earthquakes.

[0026] Anchor holes 11 on the first annular metal sheet 1 and the second annular metal sheet 2 are distributed at equal intervals along at least two concentric circles of different diameters. The anchor holes 11 are distributed along three concentric circles of different diameters, forming an inner circle, a middle circle, and an outer circle of anchor holes 11 groups.

[0027] Multiple anchor rods 3 are vertically inserted through the first / second annular metal plates 2. Their upper and lower ends pass through corresponding anchor holes 11 on the first and second annular metal plates 1 and 2, respectively, and are anchored by anchor blocks 5. The anchor rods 3, the first annular metal plate 1, and the second annular metal plate 2 together form a prestressed bearing cylinder. The surface of the anchor rods 3 is coated with an anti-corrosion coating, which is either a hot-dip galvanized layer or an epoxy coating.

[0028] Several connecting cylinders 4 are connected between the first annular metal sheet 1 and the second annular metal sheet 2 to maintain their relative position and spacing. After concrete is poured, the prestressed bearing cylinder, its internal annular region, the central region within the prestressed bearing cylinder, and the outer annular region outside the prestressed bearing cylinder together form a complete, uniformly stressed load distribution platform. The connecting cylinder 4 can be one or more of a vertical cylinder, a shear key cylinder, or a uniformly distributed support cylinder.

[0029] At the bottom edge of the prestressed bearing cylinder, a support member 7 is circumferentially connected to the second annular metal plate 2. The height of the support member 7 is adjustable. The adjustable circumferential support member 7 at the bottom of the cylinder allows for precise leveling during construction and can better cope with foundation deformation caused by frost heave, thaw settlement, or uneven settlement during operation. By making local adjustments, the overall level of the platform can be maintained, preventing harmful internal forces from forming in the structure.

[0030] The anchor rod 3 and the annular metal sheet are connected by anchor blocks 5, and two sets of anchor blocks 5 located on the same annular metal sheet are also provided with self-locking mesh strips 6. The two sets of anchor blocks 5 include a first anchor block 51 and a second anchor block 52 located in the inner ring layer.

[0031] The self-locking mesh belt 6 is a fiber mesh belt, made of high-strength, corrosion-resistant, and creep-resistant woven fiber mesh belt, such as carbon fiber, aramid, or ultra-high molecular weight polyethylene fiber belt. The core characteristics of the fiber mesh belt are high specific strength, excellent flexibility and durability, and stable performance in environments ranging from -60°C to 80°C.

[0032] Anchor block 5 is a cylindrical block with circumferential grooves or textures on its cylindrical sides, specifically designed for securing and increasing friction with the self-locking mesh strip 6. The portions of the upper and lower end faces of anchor block 5 that contact the annular metal sheet and anchor bolt assembly are hardened and / or have embedded wear-resistant pads to distribute contact stress and prevent fretting wear. Each anchor block 5 acts as an independent stress transfer station, more gently transferring the concentrated force of the anchor bolt 3 to the annular metal sheet.

[0033] Please see Figure 3 The self-locking mesh strip 6 enters from the bottom of the first and second anchor blocks 52, passes around the top of the second anchor block 52 to the bottom of the first anchor block 51, then passes around from the top of the first anchor block 51 to the top and bottom of the second anchor block 52, and finally exits from the direction in which it entered, forming a self-locking anchor block 5. When frost heave occurs in the soil below the foundation, attempting to push up the first / second annular metal sheet, the upward displacement of each point on the annular metal sheet will immediately tighten all the mesh strips radiating from the center. The tension generated by the tightened mesh strips forms a downward, distributed constraint force network, actively resisting the frost heave uplift force.

[0034] The design of anchor block 5 and self-locking mesh strip 6 adds flexible restraint and force diffusion path to the traditional mechanical anchoring. Even if individual anchor points are abnormal under extreme conditions such as extreme cold, the mesh strip can provide stress redistribution and improve the safety redundancy of the system.

[0035] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bimetallic composite anti-corrosion prestressed anchor for harsh environments, characterized in that, include: The first annular metal sheet is made of high-strength structural steel; The second annular metal sheet is arranged parallel to the first annular metal sheet in the vertical direction and at a predetermined distance, forming the main body of the cylindrical structure. The second annular metal sheet is made of corrosion-resistant metal material. Multiple anchor rods are vertically installed, with their upper and lower ends passing through the corresponding anchor holes on the first and second annular metal plates, respectively, and anchored by anchoring blocks. The anchor rods, the first annular metal plate, and the second annular metal plate together constitute a prestressed bearing cylinder. Several connecting cylinders are connected between the first annular metal sheet and the second annular metal sheet to maintain their relative position and spacing; After the prestressed bearing cylinder is poured with concrete, its internal annular region, the central region inside the prestressed bearing cylinder, and the outer annular region outside the prestressed bearing cylinder together form a complete and uniformly stressed load distribution platform.

2. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, The anchor holes on the first and second annular metal sheets are distributed at equal intervals along at least two concentric circles of different diameters.

3. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, The anchor holes are distributed along three concentric circles of different diameters, forming an inner, middle, and outer ring of anchor holes.

4. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, The connecting cylinder is one or more of a vertical cylinder, a shear key cylinder, or a uniformly distributed support cylinder.

5. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, At the bottom edge of the prestressed bearing cylinder, a support member is circumferentially provided and connected to the second annular metal sheet. The height of the support member is adjustable.

6. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, The anchor bolt surface is provided with an anti-corrosion coating, which is a hot-dip galvanized layer or an epoxy coating.

7. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 1, characterized in that, The anchor rod and the annular metal sheet are connected by anchor blocks, and two sets of anchor blocks symmetrically distributed around the center of the same annular metal sheet are also provided with self-locking mesh strips. The two sets of anchor blocks include a first anchor block and a second anchor block. The self-locking mesh strip enters from the bottom of the first and second anchor blocks, passes around the top of the second anchor block to the bottom of the first anchor block, then passes around the top of the first anchor block to the top and bottom of the second anchor block, and then exits from the starting direction of the self-locking mesh strip, forming a self-locking anchor block.

8. The bimetallic composite anti-corrosion prestressed anchor for harsh environments according to claim 7, characterized in that, The self-locking mesh tape is a fiber mesh tape; the anchor block is a cylindrical block.

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