A precast concrete wind turbine tower

Abstract

The present invention belongs to the technical field of wind power prestressed towers, and particularly relates to a precast concrete wind turbine tower barrel. The present invention is composed of a plurality of circumferential members spliced by a plurality of precast concrete members. The lateral end faces of the precast concrete members are inclined planes or smooth curved surfaces, and the vertical joint surfaces of the wind turbine tower barrel form regular helical lines. The precast concrete members of the main body of the precast concrete wind turbine tower of the present invention have controllable sizes, are easy to manufacture, convenient to construct, have good structural stress performance, can accelerate the on-site assembly progress of the precast members, reduce the construction cost, and are applicable to onshore and offshore wind turbine towers.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power prestressed tower frames, and particularly relates to a precast concrete wind turbine tower barrel. Background Art

[0002] With the rapid development of the wind power industry, the single-unit capacity of wind turbines is increasing continuously. In order to effectively utilize wind energy, the wind turbine towers are also getting taller and taller. As the load-bearing support part of the entire wind power generation unit, the cost of the tower basically accounts for about one-fourth of the cost of the entire wind turbine. In addition to ensuring the normal operation of the unit under various loads and the safety of the unit under some harsh external conditions, cost control is also very important.

[0003] In the prior art, common tower frames include truss tower frames, conical steel tower barrels, concrete tower barrels, steel-concrete tower barrels (the upper part is a steel plate structure and the lower part is a concrete tower barrel structure), etc. Among them, the concrete tower barrel or the steel-concrete tower barrel with a precast concrete tower frame is widely used. However, the traditional integral ring or segmented precast tower barrels have encountered a bottleneck due to problems such as road transportation restrictions and difficulty in reducing construction and manufacturing costs, and need to be further improved. Summary of the Invention

[0004] The present invention provides a precast concrete wind turbine tower barrel, aiming to provide a wind turbine tower barrel with controllable dimensions, unrestricted transportation, capable of accelerating the assembly progress, saving time, having a simple construction method, and being structurally safe.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A precast concrete wind turbine tower barrel includes at least a foundation, and also includes a precast concrete tower barrel main body; the precast concrete tower barrel main body is connected to the foundation, and the precast concrete tower barrel main body is formed by connecting a plurality of circumferential members up and down; the circumferential member is an annular structure formed by enclosing a plurality of single-piece precast concrete members; the side seams of the upper and lower circumferential members are connected to each other, and a plurality of regular spiral lines are formed on the side surface of the precast concrete tower barrel main body.

[0007] It also includes a steel tower barrel; the steel tower barrel is fixedly connected to the upper end of the precast concrete tower barrel main body.

[0008] The single-piece precast concrete member is an arc-shaped structure with horizontal upper and lower end faces and parallel inclined planes or smooth curved surfaces on the two lateral end faces.

[0009] The angle θ between the lateral end face of the single-piece precast concrete member and the vertical direction is 0° < θ ≤ 45°.

[0010] The angle θ between the lateral end face of the single-piece precast concrete member and the vertical direction is 20°.

[0011] The thickness of the single-piece precast concrete member is 250 mm - 600 mm, and the height h of the single-piece precast concrete member is 2.0 m - 5.0 m.

[0012] One of the single-piece precast concrete members has a door opening.

[0013] The circumferential member is formed by connecting 2 - 5 single-piece precast concrete members.

[0014] The circumferential member is formed by connecting 3 single-piece precast concrete members.

[0015] The strength grade of the single-piece precast concrete member is C40 - C70.

[0016] Beneficial effects: Through the technical solution of the foundation, the precast concrete tower barrel main body connected to the foundation and formed by vertically connecting multiple circumferential members, where the circumferential member is formed by circumferentially and fixedly connecting multiple single-piece precast concrete members of the same specification, and the circumferential connection of multiple single-piece precast concrete members forms a regular spiral line along the height of the tower barrel, the present invention has the following beneficial effects

[0017] (1) The present invention is convenient for transportation and the tower barrel assembly is fast.

[0018] (2) The present invention uses single-piece precast concrete members to form circumferential members, and the size design of the precast members is flexible and can be adjusted according to transportation requirements.

[0019] (3) The size of the precast members in the present invention is small and the casting volume is limited, avoiding the disadvantages of mass concrete construction.

[0020] (4) The joint surfaces of the precast members in the present invention are continuous, and the problem of local stress concentration caused by staggered joints will not occur, further enhancing the safety of the overall structure.

[0021] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of transverse joints and spiral joints in the embodiments of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall wind turbine tower in the embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of a single precast component in the embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the helix angle in the embodiment of the present invention;

[0027] Figure 5 It is a schematic plan view of the precast concrete tower barrel in the embodiment of the present invention.

[0028] In the figure: 1 - steel tower barrel; 2 - main body of precast concrete wind turbine tower barrel; 3 - door opening; 4 - side joint; 5 - transverse joint surface; 6 - single precast concrete component; 7 - helix; 8 - angle between the lateral end face and the vertical direction is θ; 9 - circumferential component; 10 - foundation; 11 - top contour line. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1:

[0031] According to Figures 1-5 A precast concrete wind turbine tower barrel as shown also includes a main body 2 of the precast concrete tower barrel; the main body 2 of the precast concrete tower barrel is connected to the foundation 10, and the main body 2 of the precast concrete tower barrel is formed by connecting a plurality of circumferential components 9 up and down; the circumferential component 9 is an annular structure surrounded by a plurality of single precast concrete components 6; the side joints 4 of the upper and lower circumferential components 9 are connected to each other, forming a plurality of regular helices 7 on the side of the main body 2 of the precast concrete tower barrel.

[0032] In actual use, the single-piece precast concrete member 6 is precast in a precast concrete yard according to actual needs, and then the single-piece precast concrete member 6 is transported to the construction site of the wind turbine tower barrel. After the foundation 10 is built, the single-piece precast concrete members 6 are assembled and connected circumferentially to form the first-stage circumferential member 9, which is hoisted onto the foundation 10 and connected to the foundation 10 by using the existing technology. Subsequently, the second-stage circumferential member 9 is spliced. After the second-stage circumferential member 9 is spliced, it is hoisted onto the first-stage circumferential member 9 and installed through the transverse joint surface 5 of the single-piece precast concrete member 6 with the first-stage circumferential member 9 until the preset height is reached; after all the single-piece precast concrete members 6 are connected, a regular spiral line 7 is formed on the side wall of the wind turbine tower barrel.

[0033] Adopting the technical solution of the present invention, each precast concrete member 6 has a consistent shape, a unique formwork size, and is convenient to manufacture. The size design of the precast member is flexible and can be adjusted according to transportation requirements, making transportation convenient. The size of the precast member is small, and the casting volume is limited, avoiding the disadvantages of mass concrete construction, and the product production is fast. The joint surfaces of the precast members are continuous, and there will be no problem of local stress concentration caused by staggered joints, further enhancing the safety of the overall structure.

[0034] After all the single-piece precast concrete members 6 are connected, a regular spiral line 7 is formed on the side wall of the precast concrete wind turbine tower barrel main body 2. Compared with the traditional vertical staggered joints, this technical solution has continuous joint surfaces along the height of the tower barrel, continuous connection points between each layer of rings, uniform stress, and will not generate stress concentration caused by staggered joints. Using the same specification precast concrete members 6 also saves the installation cost of the precast concrete wind turbine tower barrel 2.

[0035] Embodiment 2:

[0036] According to Figure 2 A precast concrete wind turbine tower barrel shown, the difference from Embodiment 1 is that: it further includes a steel tower barrel 1; the steel tower barrel 1 is fixedly connected to the upper end of the precast concrete tower barrel main body 2.

[0037] In actual use, the design of the steel tower barrel 1 expands the application range of the present invention.

[0038] Embodiment 3:

[0039] According to Figure 1 and Figure 3 A precast concrete wind turbine tower barrel shown, the difference from Embodiment 1 is that: the single-piece precast concrete member 6 is an arc-shaped structure with horizontal upper and lower end faces and parallel inclined planes or smooth curved surfaces on the two lateral end faces.

[0040] Preferably, the angle θ between the lateral end face of the single-piece precast concrete member and the vertical direction is 0° < θ ≤ 45°.

[0041] Preferably, the angle θ8 between the lateral end face of the single-piece precast concrete member and the vertical direction is 20°.

[0042] In actual use, when the single-piece precast concrete member 6 adopts this technical solution, on the one hand, it is convenient for transportation; on the other hand, the regular spiral line 7 formed by the side connection of the single-piece precast concrete members 6 makes the built precast concrete wind turbine tower barrel 2 continuous along the height joint surface, the connection points between the rings of each layer are continuous, the force is uniform, and there is no stress concentration caused by staggered joints.

[0043] Example 4:

[0044] According to Figure 1 and Figure 3 shown in a precast concrete wind turbine tower barrel, the difference from Example 3 is that: the thickness of the single-piece precast concrete member 6 is 250 mm - 600 mm, and the height of the single-piece precast concrete member of the single-piece precast concrete member 6 is 2.0 m - 5.0 m.

[0045] In actual use, adopting this technical solution can make the strength of the single-piece precast concrete member 6 meet the requirements, and it is suitable for splicing during transportation and installation.

[0046] Example 5:

[0047] According to Figure 1 and Figure 3 shown in a precast concrete wind turbine tower barrel, the difference from Example 1 is that: one of the single-piece precast concrete members 6 has a door opening 3.

[0048] In actual use, one of the single-piece precast concrete members 6 has a door opening 3, and this piece is spliced on the first-stage circumferential member 9 and connected to the foundation 10. Adopting this technical solution can conveniently enter the interior of the wind turbine tower barrel through the door opening 3, facilitating personnel entry and exit, installation, maintenance, and subsequent operations.

[0049] Example 6:

[0050] According to Figure 1 shown in a precast concrete wind turbine tower barrel, the difference from Example 1 is that: the circumferential member 9 is formed by connecting 2 - 5 single-piece precast concrete members 6.

[0051] Preferably, the circumferential member 9 is formed by connecting 3 single-piece precast concrete members 6.

[0052] In actual use, the adoption of this technical solution not only facilitates transportation and installation but also saves costs.

[0053] Example 7:

[0054] According to Figure 1 and Figure 3 A precast concrete wind turbine tower shown, which is different from the first embodiment in that: the strength grade of the single-piece precast concrete member 6 is C40-C70.

[0055] In actual use, the strength grade of the single-piece precast concrete member 6 is C40-C70, which ensures the general strength design requirements for the wind turbine tower and ensures the safety of construction and use.

[0056] Embodiment VIII:

[0057] A precast concrete wind turbine tower, wherein the precast concrete wind turbine tower 2 is the lower structure of the steel tower 1, the wind turbine head is installed on the upper part of the steel tower 1, and the precast concrete wind turbine tower 2 is installed on the foundation 10; wherein: the precast concrete wind turbine tower 2 is spliced by a plurality of circumferential members 9, the inner diameter and the outer diameter of each circumferential member are equal, that is, the precast concrete wind turbine tower 2 has the same diameter up and down, the inner diameter of the circumferential member is 3.8 m, the outer diameter of the circumferential member is 4.6 m, the wall thickness is 400 mm, the height of each circumferential member 9 is 2.5 m, the concrete strength grade is C60, and a door opening 3 is provided in the concrete member at the bottom to facilitate the entry and exit of personnel and the handling of equipment. Each circumferential member 9 is spliced by 3 single-piece precast concrete members 6, and the body shape characteristics of each concrete member 6 are the same.

[0058] In this embodiment, the two lateral end faces of the precast concrete member 6 are inclined planes, and the angle between the lateral end face and the vertical direction is θ8 = 25°. The size specifications of each precast concrete member 6 are the same and avoid the position of the door opening. The end face connection seams of the precast concrete member 6 form a regular spiral line 7 along the total height of the tower. For each circumferential member 9 installed along the total height of the precast concrete member, the bottom contour line of the lateral end face of each precast concrete member 6 should be in the same position as the top contour line 11 of the lateral end face of the single-piece precast concrete member 6 of the layer below it.

[0059] In summary, by means of the above technical solution of the present invention, through the precast concrete tower connected by a plurality of circumferential members connected up and down on the foundation 10, the circumferential members are fixedly connected in a circumferential direction by a plurality of single-piece precast concrete members, and the side seams of the connection of the plurality of single-piece precast concrete members form a regular spiral line.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0061] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0062] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0063] Without conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects, and the specific combinations will not be elaborated here one by one.

[0064] As mentioned above, these are only the preferred embodiments of the present invention. The present invention will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

1. A precast concrete wind turbine tower barrel, at least comprising a foundation base (10), characterized in that: It also includes a precast concrete tower barrel main body (2); the precast concrete tower barrel main body (2) is connected to a foundation (10), and the precast concrete tower barrel main body (2) is formed by connecting a plurality of circumferential members (9) up and down; the circumferential member (9) is an annular structure formed by enclosing a plurality of single-piece precast concrete members (6); the side seams (4) of the upper and lower circumferential members (9) are connected to each other, forming a plurality of regular spiral lines (7) on the side of the precast concrete tower barrel main body (2); the single-piece precast concrete member (6) is an arc-shaped structure with horizontal upper and lower end faces and parallel inclined planes or smooth curved surfaces on the two lateral end faces. The angle θ (8) between the lateral end face of the single-piece precast concrete member and the vertical direction is 20°. So that the built precast concrete wind turbine tower barrel has continuous height joints, continuous connection points between each layer of rings, and uniform stress. The circumferential member (9) is formed by connecting 2-5 single-piece precast concrete members (6). For each ring of circumferential members (9) installed along the total height of the precast concrete member, the bottom contour line of the lateral end face of the single-piece precast concrete member (6) should be in the same position as the top contour line of the lateral end face of the single-piece precast concrete member (6) of the layer below it.

2. The precast concrete wind turbine tower barrel according to claim 1, wherein: It also includes a steel tower barrel (1); the steel tower barrel (1) is fixedly connected to the upper end of the precast concrete tower barrel main body (2).

3. A precast concrete wind turbine tower as claimed in claim 1 or 2, characterized in that: The thickness of the single-piece precast concrete member (6) is 250mm - 600mm, and the height of the single-piece precast concrete member of the single-piece precast concrete member (6) is 2.0m - 5.0m.

4. A precast concrete wind turbine tower according to claim 1, wherein: One of the single-piece precast concrete members (6) is provided with a door opening (3).

5. A precast concrete wind turbine tower as claimed in claim 1, characterized in that: The circumferential member (9) is formed by connecting 3 single-piece precast concrete members (6).

6. A precast concrete wind turbine tower according to claim 1, characterized in that: The strength grade of the single-piece precast concrete member (6) is C40 - C70.

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