Z-shaped prefabricated concrete wind power tower tube segment and wind power tower tube

Abstract

The invention provides a Z-shaped prefabricated concrete wind power tower drum duct piece and a wind power tower drum. The concrete wind power tower drum duct piece comprises a duct piece lower layer and a duct piece upper layer. The transverse sections of the segment lower layer and the segment upper layer are concentric arcs with the same thickness and the same height and have an overlapped part, the thickness of the overlapped part is twice that of the segment lower layer or the segment upper layer, and the height of the overlapped part is 1 / 4-1 / 2 that of the segment lower layer or the segment upper layer; the overall height of the tower tube segment is 3-4 m. The wall thickness of a tower formed by the Z-shaped prefabricated concrete wind power tower tube segments is twice that of a tower formed by common arc-shaped segments, but the thickness of a single segment is not increased, and the bending resistance of the tower tube is improved while the Z-shaped prefabricated concrete wind power tower tube segments have the light characteristic. The inner layers of every two adjacent layers of annular units are nested in the outer layers, constraint is formed in the radial direction, the influence of pipe piece transverse splicing seams on the stability of the tower barrel is reduced, and the shear capacity of the tower barrel is improved.

Description

Technical Field

[0001] The present application belongs to the field of wind power technology and relates to a "Z"-shaped prefabricated concrete wind power tower segment and a wind power tower. Background Art

[0002] With the growth of global energy demand and the advancement of low-carbon economy, wind power generation, as an important renewable energy technology, has developed rapidly. As the infrastructure of wind turbines, the structural performance of wind turbine towers is directly related to the operational safety and power generation efficiency of wind turbines. Therefore, continuously optimizing the design and manufacturing process of wind turbine towers and improving their structural performance and reliability have become the key to ensuring the stable and efficient development of the wind power industry.

[0003] Steel towers were the first towers used in wind farms, featuring high processing accuracy and easy installation. However, with the continuous increase in the capacity of wind turbines and the height of towers, problems with steel towers have become more prominent. The exponential growth in the use of high-strength steel in the construction of ultra-high towers (height over 120 meters) has led to a significant increase in costs. The transportation of large-diameter towers is limited by traffic conditions, and they are prone to corrosion in wet, hot, salty, and acidic environments, resulting in high maintenance costs.

[0004] Concrete towers are gradually entering the market as a new solution. Their main advantages include: (1) Wide range of material sources: Concrete can be obtained locally, reducing transportation costs. (2) Superior mechanical properties: Concrete is superior to steel in terms of compressive strength and durability, and is particularly suitable for the construction of high towers. (3) Strong construction flexibility: Concrete towers can be prefabricated or cast-in-place, and the construction plan can be flexibly adjusted according to actual needs.

[0005] The construction period of traditional cast-in-place concrete towers is long, greatly affected by weather and environmental conditions, and the quality control of the overall structure is difficult. The core component of the prefabricated tower is the factory-prefabricated concrete segments, which are usually designed as several annular units, each of which consists of 4-6 arc-shaped segments. The annular splicing structure has good integrity and can flexibly adapt to different tower diameters and heights by adjusting the number of units. There are reserved holes in the longitudinal direction of the segments. After several layers of annular units are assembled longitudinally to a certain height, prestressed tendons are passed through the holes to ensure the structural stability and shear resistance after assembly. Through standardized production, rapid on-site assembly is achieved. Compared with traditional cast-in-place concrete towers, the construction period is short and the quality control of the segments is better. However, there is also a contradiction between structural performance and lightweight, and the problem that the performance of the splicing seams between the segments affects the overall stability.

[0006] As the length of wind turbine blades increases and installed capacity increases, the tower height is gradually increased to obtain stronger wind energy resources. The wind load that the tower needs to bear also increases. The cross-sectional area of ​​the tower can be increased by increasing the tower diameter or thickening the thickness of the tube segment, thereby improving the tower's bending resistance. Thickening the tube segment can certainly improve the tower's bending resistance, but it also reduces the efficiency of transportation and installation.

[0007] The joints between the segments are one of the key factors affecting the overall stability of the tower. Not only are there longitudinal joints between two adjacent segments in the same annular unit, but there are also transverse joints between the upper and lower annular units. The tower segment connection methods can be divided into wet connection and dry connection according to whether grouting is performed. Wet connection has a certain impact on the construction period of the tower because it requires a certain amount of time for maintenance and is affected by the level of construction technology. Although dry connection can improve construction efficiency, it requires good docking between the segment installation holes and has high requirements for the dimensional accuracy and surface flatness of the segments. In addition, the joints of traditional dry connections are the weak points of the tower. Due to the lack of constraints, they are prone to cracking when subjected to force, which in turn leads to a series of problems such as reduced durability.

[0008] In summary, the efficiency problems caused by the traditional precast concrete segment form and the durability problems caused by the assembly joints have, to a certain extent, restricted the development of wind turbine towers in a higher direction. Therefore, a new precast concrete segment form is urgently needed to solve the related problems. Summary of the invention

[0009] Based on the shortcomings of the above-mentioned prior art, the purpose of this application is to provide a "Z"-shaped prefabricated concrete wind turbine tower segment and a wind turbine tower. Specifically, the wind turbine tower segment has a "Z"-shaped longitudinal section, and is an arc-shaped segment as a whole, divided into two layers, the two layers have different diameters, the diameter of the lower layer is greater than the diameter of the upper layer, or the diameter of the upper layer is greater than the diameter of the lower layer, and the thickness of the overlapping part of the two layers is twice the thickness of each layer, forming a stepped shape.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] One of the technical solutions of the present application provides a "Z"-shaped prefabricated concrete wind turbine tower segment, wherein the concrete wind turbine tower segment comprises: a segment lower layer and a segment upper layer;

[0012] The transverse sections of the lower layer and the upper layer of the segment are concentric arcs with the same curvature and the same thickness, which is 80 to 200 mm; the transverse direction is a direction perpendicular to the height direction;

[0013] The lower layer of the segment and the upper layer of the segment have an overlapping portion, the thickness of the overlapping portion is twice that of the lower layer of the segment or the upper layer of the segment, that is, 160 to 400 mm; the height of the overlapping portion is 1 / 4 to 1 / 2 of the height of the lower layer of the segment or the upper layer of the segment;

[0014] The lower layer of the segment and the upper layer of the segment have the same height, the longitudinal section of the concrete wind turbine tower segment is in a "Z" shape, and the height of the entire tower segment is 3 to 4 meters.

[0015] Furthermore, the lower layer of the tube segment and the upper layer of the tube segment are integrally formed.

[0016] Furthermore, the material of the "Z"-shaped precast concrete wind turbine tower segment is C50 grade or above concrete.

[0017] Furthermore, the curvature of the Z-shaped precast concrete wind turbine tower tube segment is Where π is the circumference of a circle, and n is any integer between 4 and 6. For towers of different heights and diameters, different numbers of segments can be selected. The "Z"-shaped prefabricated concrete wind power tower tube segments are spliced ​​together to form a complete circular annular unit.

[0018] Furthermore, the lower layer and the upper layer of the segment are provided with reinforcement holes reserved in the longitudinal direction, and the reinforcement holes are used for inserting prestressed tendons; the longitudinal direction is the height direction of the tower segment.

[0019] Furthermore, the "Z"-shaped precast concrete wind turbine tower segments are spliced ​​by dry connection or wet connection. The wet connection is a common method in the art such as cast-in-place concrete and grouting. The dry connection is a common method in the art such as epoxy resin glue, bolts, and welding.

[0020] The second technical solution of the present application provides a concrete wind turbine tower tube annular unit, wherein the annular unit is formed by splicing n "Z"-shaped prefabricated concrete wind turbine tower tube segments.

[0021] Furthermore, the reinforcement holes are equidistantly distributed in the annular direction in each annular unit; and the diameter of each reinforcement hole is 40 to 80 mm.

[0022] The third technical solution of the present application provides a concrete wind power tower, which is formed by connecting a plurality of ring-shaped units in sequence from bottom to top. In the longitudinal direction, the prestressed tendons tighten the adjacent ring-shaped units through the reserved reinforcing holes of the pipe segments to form a stable structure.

[0023] Furthermore, the concrete wind power tower tube is spliced ​​and assembled by hoisting.

[0024] Furthermore, in the lower layer and the upper layer of the segment, the one with a larger diameter is called the outer layer of the segment, and the one with a smaller diameter is called the inner layer of the segment. The outer layer of each annular unit has the same diameter as the outer layer of the segment of the adjacent annular unit, and the rib holes are aligned in the longitudinal direction; the inner layer of each annular unit has the same diameter as the inner layer of the segment of the adjacent annular unit, and the rib holes are aligned in the longitudinal direction. The inner side of the outer layer of each annular unit fits the outer side of the inner layer of the segment of the adjacent annular unit.

[0025] A concrete wind turbine tower tube made of the above-mentioned "Z"-shaped prefabricated concrete wind turbine tower tube segment, the height of the concrete wind turbine tower tube is 80-200m, the diameter is 6-10m, and the concrete wind turbine tower tube is suitable for the concrete section of a concrete tower or a steel-concrete tower.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) Avoid joints and improve the bearing capacity of the joints. The innovative "Z"-shaped segment design eliminates the traditional joints. At the same time, the wall thickness of the "Z"-shaped tower segment junction is twice the wall thickness of the tower composed of traditional segments, which greatly improves the bearing capacity of the weak joints.

[0028] (2) Improve the stability of the tower. The inner layers of two adjacent layers of annular units are nested inside the outer layers, forming radial constraints. In addition to relying on prestressed tendons and structural adhesives at the joints, the upper and lower layers of the segments can also bear pressure and transmit force through the larger contact surface of the side walls, reducing the impact of the transverse joints of the segments on the stability of the tower and improving the bearing capacity of the tower.

[0029] (3) The longitudinal cross-section is "Z"-shaped, and the upper and lower layers of the pipe segments complement each other, which can serve as a natural auxiliary guide, making it easier to align the pipes during lifting and splicing, improving the assembly efficiency and providing a strong guarantee for rapid construction.

[0030] (4) Conventional pipe segments generally increase the bending resistance of the tower by increasing the thickness of the pipe segments, but this will increase the weight of the pipe segments and reduce transportation efficiency. The present invention improves the bending resistance of the tower by stacking the inner and outer layers of pipe segments, effectively reducing the weight of the pipe segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a "Z"-shaped precast concrete wind power tower tube segment that is larger at the top and smaller at the bottom (lower inside and higher outside) provided by the present invention;

[0032] Figure 2 This is a schematic diagram of a "Z"-shaped precast concrete wind power tower tube segment that is small at the top and large at the bottom (high inside and low outside) provided by the present invention;

[0033] Figure 3This is a schematic diagram of the reinforcing bar penetration holes of a "Z"-shaped precast concrete wind power tower tube segment that is larger at the top and smaller at the bottom (lower inside and higher outside) provided by the present invention;

[0034] Figure 4 This is a schematic diagram of the reinforcing bar penetration holes of a "Z"-shaped precast concrete wind power tower tube segment that is small at the top and large at the bottom (high inside and low outside) provided by the present invention;

[0035] Figure 5 It is a schematic diagram of an annular unit provided by the present invention, which is made of 6 "Z"-shaped precast concrete wind power tower tube segments that are larger at the top and smaller at the bottom (lower inside and higher outside);

[0036] Figure 6 It is a schematic diagram of an annular unit provided by the present invention, which is made of 6 "Z"-shaped precast concrete wind power tower tube segments that are small on the top and large on the bottom (high inside and low outside);

[0037] Figure 7 It is a schematic diagram of a tower provided by the present invention, which is composed of annular units that are larger at the top and smaller at the bottom (lower inside and higher outside);

[0038] Figure 8 It is a schematic diagram of a tower provided by the present invention, which is composed of annular units that are small at the top and large at the bottom (high inside and low outside);

[0039] Fig. 9 It is a cross-sectional view of the splicing of concrete pipe segments provided by the present invention;

[0040] Reference numerals:

[0041] 1-lower layer of segment, 2-upper layer of segment, 3-rebar insertion holes, 4-prestressed tendons. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0043] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0044] Example 1 A "Z" shaped prefabricated concrete wind turbine tower tube segment

[0045] like Figures 1 to 6As shown, this embodiment provides a "Z"-shaped precast concrete wind turbine tower segment, and an annular unit made of the "Z"-shaped precast concrete wind turbine tower segment. The "Z"-shaped precast concrete wind turbine tower segment is made of C50 grade concrete.

[0046] The "Z"-shaped prefabricated concrete wind turbine tower tube segment includes: a tube segment lower layer 1 and a tube segment upper layer 2. The tube segment lower layer 1 and the tube segment upper layer 2 are in the direction of the transverse section (the direction perpendicular to the height direction) and present a concentric arc shape, that is, the tube segment lower layer 1 and the tube segment upper layer 2 have the same curvature. The tube segment lower layer 1 and the tube segment upper layer 2 have the same thickness, both of which are 200mm. The tube segment lower layer 1 and the tube segment upper layer 2 have an overlapping portion, and the thickness of the overlapping portion is twice that of the tube segment lower layer 1 or the tube segment upper layer 2, that is, 400mm. The height of the overlapping portion is 1 / 4 of the height of the tube segment lower layer 1 or the tube segment upper layer 2. The tube segment lower layer 1 and the tube segment upper layer 2 have the same height. Due to the overlapping portion, the longitudinal section of the concrete wind turbine tower tube segment is "Z"-shaped, and the height of the entire tower tube segment is 3 to 4m.

[0047] Figure 1 (correspond Figure 3 and Figure 5 )and Figure 2 (correspond Figure 4 and Figure 6 ) respectively displayed two types of "Z"-shaped precast concrete wind turbine tower segments: large on top and small on bottom (low inside and high outside) and small on top and large on bottom (high inside and low outside).

[0048] The curvature of the "Z"-shaped precast concrete wind turbine tower tube segment is That is, six identical "Z"-shaped precast concrete wind turbine tower segments can be assembled (the assembly connection method is grouting) to form a complete circular ring structure, which is called a ring unit (such as Figures 5-6 shown).

[0049] The lower layer 1 and the upper layer 2 of the pipe segment are both reserved with two reinforcement holes 3 in the longitudinal direction (see Figures 3-4 ), the rib-piercing holes 3 are equidistantly distributed in the annular direction in each annular unit (i.e., a total of 12 holes are provided, see Figures 5-6 ), the diameter of each reinforcement hole 3 is 80 mm. The reinforcement hole 3 is used to penetrate the prestressed reinforcement 4.

[0050] Example 2 A concrete wind turbine tower

[0051] like Figures 7 to 9 As shown, this embodiment provides a concrete wind turbine tower tube based on the "Z"-shaped prefabricated concrete wind turbine tower segment / ring unit provided in Example 1.

[0052] The outer layer of each annular unit has the same diameter as the outer layer of the adjacent annular unit, and the rib holes 3 are aligned in the longitudinal direction; the inner layer of each annular unit has the same diameter as the inner layer of the adjacent annular unit, and the rib holes 3 are aligned in the longitudinal direction. The inner side of the outer layer of each annular unit fits the outer side of the inner layer of the adjacent annular unit. In the longitudinal direction, the prestressed tendons 4 tighten the adjacent annular units through the rib holes 3 reserved in the segments to form a stable structure; the number of the rib holes 3 and the prestressed tendons 4 are both set to 12.

[0053] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A "Z" shaped prefabricated concrete wind turbine tower segment, characterized in that: The concrete wind turbine tower tube segment comprises: a tube segment lower layer (1) and a tube segment upper layer (2); The transverse sections of the lower layer (1) and the upper layer (2) of the tube segment are concentric arcs with the same curvature and the same thickness; the transverse direction is a direction perpendicular to the height direction; The lower layer (1) of the pipe segment and the upper layer (2) of the pipe segment have an overlapping portion, and the thickness of the overlapping portion is twice that of the lower layer (1) of the pipe segment or the upper layer (2) of the pipe segment; The lower layer (1) of the pipe segment and the upper layer (2) of the pipe segment have the same height, and the longitudinal section of the concrete wind turbine tower pipe segment is in a "Z" shape.

2. A "Z" shaped precast concrete wind turbine tower segment according to claim 1, characterized in that: The height of the overlapping portion is 1 / 4 to 1 / 2 of the height of the lower layer (1) of the pipe segment or the upper layer (2) of the pipe segment; The thickness of the lower layer (1) and the upper layer (2) of the segment is 80 to 200 mm; the thickness of the overlapping portion of the lower layer (1) and the upper layer (2) of the segment is 160 to 400 mm; and the overall height of the tower segment is 3 to 4 m.

3. The "Z"-shaped precast concrete wind turbine tower segment according to claim 1 is characterized in that: The tube segment lower layer (1) and the tube segment upper layer (2) are integrally formed.

4. The "Z"-shaped precast concrete wind turbine tower segment according to claim 1 is characterized in that: The material of the "Z"-shaped precast concrete wind turbine tower segment is C50 grade or above concrete.

5. The "Z"-shaped precast concrete wind turbine tower segment according to claim 1 is characterized in that: The curvature of the "Z" shaped precast concrete wind turbine tower tube segment is Where n is any integer between 4 and 6, and π is the value of pi.

6. The "Z"-shaped precast concrete wind turbine tower segment according to claim 1, characterized in that: The lower layer (1) and the upper layer (2) of the tube segment are provided with reinforcement holes (3) in the longitudinal direction, and the reinforcement holes (3) are used to penetrate prestressed tendons (4); the longitudinal direction is the height direction of the tower tube segment.

7. A concrete wind power tower tube annular unit, characterized in that: The annular unit is formed by splicing n "Z"-shaped precast concrete wind turbine tower tube segments as described in any one of claims 1 to 6; the reinforcement holes (3) are distributed equidistantly in the annular direction in each annular unit; and the diameter of each reinforcement hole (3) is 40 to 80 mm.

8. A concrete wind power tower, characterized in that: A plurality of annular units are connected in sequence from bottom to top to form a concrete wind power tower; in the longitudinal direction, the prestressed tendons (4) tighten the adjacent annular units through the tendon penetration holes (3) reserved in the pipe segments to form a stable structure.

9. The concrete wind power tower according to claim 8, characterized in that: In the segment lower layer (1) and the segment upper layer (2), the layer with a larger diameter is called the segment outer layer, and the layer with a smaller diameter is called the segment inner layer; The outer layer of the pipe segment of each annular unit has the same diameter as the outer layer of the pipe segment of the adjacent annular unit, and the rib penetration holes (3) are aligned in the longitudinal direction; the inner layer of the pipe segment of each annular unit has the same diameter as the inner layer of the pipe segment of the adjacent annular unit, and the rib penetration holes (3) are aligned in the longitudinal direction; the inner side of the outer layer of the pipe segment of each annular unit is in contact with the outer side of the inner layer of the pipe segment of the adjacent annular unit.

10. The concrete wind power tower according to claim 8, characterized in that: The height of the concrete wind power tower is 80-200m, and the diameter is 6-10m; the concrete wind power tower is used for the concrete section of a concrete tower or a steel-concrete tower.

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