Fabricated wind power generation tower foundation structure

Abstract

The utility model discloses an assembly type wind power generation tower tube foundation structure which comprises a plurality of prefabricated foundation components, and the prefabricated foundation components are prefabricated and formed and are assembled on site to form an annular foundation structure. The pre-stress tensioning system comprises pre-stress cables or reinforcing steel bars penetrating through the multiple prefabricated foundation components and is used for applying radial pre-stress to the annular foundation structure; the connecting structure comprises a key groove and an elbow bolt which are arranged at the joint of the adjacent prefabricated foundation components, and the key groove comprises protrusions and recesses which are distributed at intervals and is used for enhancing friction force between the components. Wherein the splicing angle theta of the prefabricated foundation component is a standard angle or a non-standard angle. The quick assembly and the structural stability of the foundation are realized by prefabricating the fan-shaped components in a factory and adopting a prestress tension and mechanical connection technology. The angle of the prefabricated part is standardized, on-site wet operation is avoided, the construction period is short, and the prefabricated part is suitable for different geological conditions and has the advantages of environment friendliness, high efficiency, reliability and the like.

Description

Technical Field

[0001] This utility model relates to the field of flexible packaging formulation technology, and more specifically to a prefabricated wind power generation tower foundation structure. Background Technology

[0002] Wind power is a clean, environmentally friendly, and pollution-free technology that requires no fuel, requires little land, and has seen significant development in my country's investment in wind power in recent years.

[0003] The foundation of a wind turbine tower is a crucial component of wind power generation. However, both existing steel and concrete towers are still constructed using cast-in-place methods. Due to the large volume of concrete work and the presence of human factors, the quality of the foundation directly affects the service life and power generation efficiency of the wind turbine. Furthermore, the construction site for wind turbine foundations involves a significant amount of wet work, which contradicts current prefabricated construction methods (i.e., green and environmentally friendly construction methods). Utility Model Content

[0004] The main objective of this invention is to propose a prefabricated wind turbine tower foundation structure and construction method to address the technical problems existing in the prior art. By using factory-prefabricated fan-shaped components, prestressing tensioning, and mechanical connection technology, rapid assembly and structural stability of the foundation are achieved. The prefabricated components have standardized angles, eliminating wet work on-site, shortening the construction period, and making it suitable for various geological conditions. It also offers advantages such as environmental friendliness, high efficiency, and reliability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A prefabricated wind turbine tower foundation structure includes:

[0007] Multiple prefabricated foundation components, which are prefabricated and assembled on-site to form a ring-shaped foundation structure; a prestressed tensioning system, including prestressed cables or steel bars penetrating the multiple prefabricated foundation components, for applying radial prestress to the ring-shaped foundation structure; a connecting structure, including keyways and elbow bolts disposed at the joints of adjacent prefabricated foundation components, wherein the keyways include spaced protrusions and recesses for enhancing the friction between components; wherein the splicing angle θ of the prefabricated foundation components is a standard angle or a non-standard angle.

[0008] In some embodiments, the standard angle is selected from 45°, 30°, 22.5°, 18°, 15°, 11.25° or 10°, and the number of prefabricated foundation components is an integer value of 360° divided by the angle θ.

[0009] In some embodiments, the prefabricated foundation component includes a support area and a base plate, and keyways are provided on the sides of the support area and the base plate, with the protrusions and recesses of adjacent prefabricated foundation components being adapted to each other; the keyways are rectangular, circular or polygonal in shape.

[0010] In some embodiments, the tensioning method of the prestressed tensioning system is any one of the following: (a) group tensioning: two or more adjacent precast foundation components are prestressed together and connected by elbow bolts to form a local whole; (b) full-ring tensioning: the whole is tensioned by passing through all precast foundation components with one or more prestressed cables or steel bars.

[0011] In some embodiments, the joints of the precast foundation components are filled with fine aggregate concrete, mortar, or precast component splicing adhesive to seal the joints and enhance the overall integrity.

[0012] In some embodiments, the precast foundation component has through prestressed wire holes on the upper and lower sides of the support area, and prestressed operation space is reserved at the support areas at both ends of the prestressed wire holes.

[0013] In some embodiments, a cushion layer is provided at the bottom of the annular foundation structure, and the cushion layer is fixedly connected to the base plate of the precast foundation component by anchoring material.

[0014] In some embodiments, the side edges on both sides of the base plate are provided with elbow anchor bolt holes for fitting elbow bolts.

[0015] In some embodiments, a rib is further provided between the base plate and the support area.

[0016] This embodiment also provides a construction method for the prefabricated wind power tower foundation structure, characterized by the following steps: (S1) prefabricating the prefabricated foundation components in a factory and transporting them to the construction site; (S2) excavating the foundation pit on site and pouring the cushion layer; (S3) assembling the prefabricated foundation components and aligning adjacent components through keyways; (S4) installing prestressed cables or reinforcing bars, tensioning them in sections or in the entire ring to form an integral ring structure; (S5) connecting the elbow bolts and filling the joints with fine stone concrete or splicing adhesive; (S6) carrying out waterproofing treatment and backfilling and compacting the soil to complete the foundation construction.

[0017] The advantages of this utility model compared with the prior art are:

[0018] 1. Improved construction efficiency: Precast components are produced in factories, reducing on-site assembly time to 1 / 3 of that of traditional processes;

[0019] 2. Stable and reliable quality: Eliminating human error in cast-in-place processes, and strengthening the overall structural integrity through prestressing and keyways;

[0020] 3. Green and environmentally friendly: Reduces on-site wet work and construction waste emissions;

[0021] 4. High adaptability: The number and angle of components can be adjusted according to wind power requirements, making it suitable for different geological conditions. Attached Figure Description

[0022] Figure 1 , Figure 2 and Figure 3 These are schematic diagrams of prefabricated foundation components from different perspectives.

[0023] Figure 4 A schematic diagram showing the tensioning of the three precast foundation components;

[0024] Figure 5 A schematic diagram of full-ring tensioning of multiple precast foundation components;

[0025] Figure 6 This is a 3D schematic diagram of the upper wind turbine tower assembly.

[0026] Figure 7 Keyway layout diagram;

[0027] The attached diagrams and their corresponding names are as follows: 1-Prestressed threading hole, 2-rib beam, 3-elbow anchor bolt hole, 4-base plate, 5-prestressed operating space, 6-support area, 7-component 1, 8-component 2, 9-component 3, 10-recessed, 11-protruding. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0033] The following will combine Figures 1-7 This application provides a detailed description of a prefabricated wind power tower foundation structure according to its embodiments. It is worth noting that the following embodiments are merely illustrative of this application and do not constitute a limitation thereof.

[0034] Example 1:

[0035] See Figures 1-7 As shown, a prefabricated wind turbine tower foundation structure includes: multiple prefabricated foundation components, a prestressing tensioning system, and a connecting structure. The prefabricated foundation components are prefabricated and assembled on-site to form a ring-shaped foundation structure. The prestressing tensioning system includes prestressing cables or reinforcing bars penetrating multiple prefabricated foundation components to apply radial prestress to the ring-shaped foundation structure. The connecting structure includes keyways and bent bolts disposed at the joints of adjacent prefabricated foundation components. The keyways include spaced protrusions 11 and recesses 10 to enhance the friction between components. The splicing angle θ of the prefabricated foundation components can be a standard angle or a non-standard angle.

[0036] The standard angle is selected from 45°, 30°, 22.5°, 18°, 15°, 11.25°, or 10°, and the number of prefabricated foundation components is an integer value of 360° divided by the angle θ. Non-standard angles may also be used, and the non-standard angles shall be determined by the design unit.

[0037] It should be noted that the prefabricated foundation components can be prefabricated in a factory according to preset dimensions, including a support area 6 and a base plate 4. The sides of the support area 6 and the base plate 4 are provided with keyways or rough surfaces, and the protrusions 11 and recesses 10 of adjacent prefabricated foundation components are adapted to each other. After prestressing, the friction between the components can be increased, thereby making the wind tower foundation form a more stable whole. The keyway can be rectangular, circular, or polygonal in shape.

[0038] Figure 7 The illustration shows only rectangular keyways, but circular or other polygonal shapes can also be used. The protrusions 11 and recesses 10 should be arranged alternately. The illustration shows only the alternating arrangement of rectangular keyways, but they can also be arranged in groups (two groups or more groups) with alternating arrangements.

[0039] In this embodiment, the tensioning method of the prestressed tensioning system is any one of the following:

[0040] (a) Group tensioning: Two or more adjacent precast foundation components are grouped together for prestressing tensioning and connected by elbow bolts to form a local whole;

[0041] (b) Full-ring tensioning: The whole precast foundation components are tensioned by passing through one or more prestressed cables or steel bars.

[0042] The joints between precast foundation components can be filled with mortar or precast components before installation.

[0043] In this embodiment, the joints of the prefabricated foundation components are filled with fine stone concrete, mortar, or prefabricated component splicing adhesive to seal the joints and enhance the overall integrity.

[0044] In this embodiment, the precast foundation component has through prestressing threading holes 1 on both the upper and lower sides of the support area 6, and prestressing operation spaces 5 are reserved at both ends of the support area 6 of the prestressing threading holes 1. After tensioning, the concrete is compacted.

[0045] In this embodiment, a pad layer is provided at the bottom of the annular foundation structure, and the pad layer is fixedly connected to the base plate 4 of the prefabricated foundation component by anchoring material.

[0046] See Figure 1 The base plate 4 has elbow anchor bolt holes 3 on its side edges for use with elbow bolts. The elbow bolts can be used to connect two adjacent precast foundation components.

[0047] In some embodiments, a rib beam 2 is further provided between the base plate 4 and the support area 6. The rib beam 2 can improve the overall structural strength, and the number of rib beams 2 is not limited to one; multiple rib beams can be designed according to actual needs.

[0048] Example 2

[0049] A construction method for a prefabricated wind turbine tower foundation structure includes:

[0050] Step one is broken down into three steps that can be performed simultaneously or sequentially:

[0051] Step 1.1: Mold processing at the component factory → Production of precast foundation components → Vehicles transport the precast foundation components to the construction site;

[0052] Step 1.2: Construction excavation of the foundation → deep foundation (if any) → pouring of the foundation pad;

[0053] Step 1.3: Prepare on-site foundation construction materials, including tension cables or steel bars, anchoring materials, elbow bolts (or other effective connections), fine aggregate concrete, mortar or precast component splicing adhesive, etc.

[0054] Step 2: Assembly of components on site → Tensioning of foundation components with steel strands → Reinforcement with elbow anchor bolts → Filling the prestressing operation space 5 with fine stone concrete → Waterproofing of the foundation → Backfilling and compaction of the foundation → Construction of the superstructure.

[0055] The assembled prefabricated wind turbine tower foundation structure can be used to install the wind turbine tower, such as... Figure 6 As shown.

[0056] 2. Explanation of Foundation Prestressing Tensioning

[0057] Tensioning can be performed in groups of two or more (or all at once). The following examples illustrate tensioning in groups of two and tensioning all at once:

[0058] ① Two groups of tensioning

[0059] like Figure 4 As shown, components 17 and 28 are first tensioned together using steel strands or other effective tensionable cables or reinforcing bars (thick dashed lines). Figure 4 (Two tensioning ducts are shown, i.e., two dashed lines); then tension the cables or reinforcing bars (thick solid lines) between components 28 and 39. Next, connect the elbow bolts between components 17 and 28, and between components 28 and 39, so that components 17, 28, and 39 can form a whole. In this manner, after all the foundation components are tensioned and connected with elbow bolts, all the components will form a whole.

[0060] ② Full tensioning

[0061] like Figure 5 As shown, Figure 5 Central cable or reinforcing bar ( Figure 5Only one tensioning line (a thick solid line) is drawn in the diagram, passing through component 17 and all other components, then passing through component 17 again before tensioning, and then connecting the elbow anchor bolts. Finally, the foundation can form a stable whole.

[0062] Example 3

[0063] Standard angle splicing

[0064] 1. Prefabricate 22.5° arc-shaped components (16 in total), with rectangular keyways on the sides of the components;

[0065] 2. After on-site assembly, the components are tensioned in groups using steel strands (2 components per group), with a tension force of 150kN;

[0066] 3. Fill the joint with C40 fine aggregate concrete, and set the torque of the elbow bolts to 200 N·m;

[0067] 4. Complete the waterproof coating application and ensure the backfill soil compaction degree is ≥95%.

[0068] Example 4

[0069] Non-standard angle adaptation

[0070] 1. Design 19 non-standard components with an 18.5° angle according to site requirements; the keyway is circular.

[0071] 2. The full-ring tensioning method is adopted, with a single steel strand running through all components, and the tension force is 180kN;

[0072] 3. Epoxy resin adhesive is used at the joints, eliminating the need for elbow bolts;

[0073] 4. The foundation layer is fixed with anchoring agent to enhance the foundation's resistance to settlement.

[0074] The above description is only a preferred embodiment of the present utility model and is used to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prefabricated wind power generation tower foundation structure, characterized in that, include: Multiple prefabricated foundation components, which are prefabricated and assembled on site to form a ring-shaped foundation structure; The prestressed tensioning system includes prestressed cables or steel bars that penetrate multiple precast foundation components, used to apply radial prestress to the ring foundation structure; the connecting structure includes keyways and bent bolts disposed at the joints of adjacent precast foundation components, the keyways including spaced protrusions and recesses, used to enhance the friction between components; wherein, the splicing angle θ of the precast foundation components is a standard angle or a non-standard angle.

2. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The standard angle is selected from one of 45°, 30°, 22.5°, 18°, 15°, 11.25° or 10°, and the number of prefabricated foundation components is an integer value of 360° divided by the angle θ.

3. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The prefabricated foundation component includes a support area and a base plate. The sides of the support area and the base plate are provided with keyways, and the protrusions and recesses of adjacent prefabricated foundation components are adapted to each other. The keyways are rectangular, circular, or polygonal in shape.

4. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The tensioning method of the prestressed tensioning system is any one of the following: (a) group tensioning: two or more adjacent precast foundation components are prestressed together and connected by elbow bolts to form a local whole; (b) full-ring tensioning: the whole is tensioned by passing through all precast foundation components with one or more prestressed cables or steel bars.

5. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The joints of the precast foundation components are filled with fine aggregate concrete, mortar, or precast component splicing adhesive to seal the joints and enhance the overall integrity.

6. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The precast foundation component has through prestressed wire holes on the upper and lower sides of the support area, and prestressed operation space is reserved at the support area at both ends of the prestressed wire holes.

7. The prefabricated wind power tower foundation structure according to claim 1, characterized in that, The bottom of the annular foundation structure is provided with a cushion layer, which is fixedly connected to the bottom plate of the precast foundation component by anchoring material.

8. The prefabricated wind power tower foundation structure according to claim 3, characterized in that, The base plate has elbow anchor bolt holes on both sides of its side edges for use with elbow bolts.

9. A prefabricated wind power tower foundation structure according to claim 8, characterized in that, Ribs are also provided between the base plate and the support area.

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