Prefabricated tower tube reinforced by ultra-high performance concrete

Abstract

The invention discloses an ultra-high performance concrete reinforced prefabricated tower drum which comprises a plurality of tower sections spliced in the vertical direction, and each tower section comprises a common concrete layer, an upper UHPC reinforcing layer on the upper portion and a lower UHPC reinforcing layer on the lower portion. UHPC is arranged at the upper end and the lower end of a common concrete layer of the tower section for reinforcement, the compression bearing capacity of the tower drum at a transverse joint can be improved through the high-strength compression resistance of the UHPC, the reliability of the transverse joint is improved, the phenomenon of crushing and edge breakage caused by overlarge local pressure of concrete is prevented, the bearing capacity of the tower drum can be improved, and the service life of the tower drum is prolonged. Correspondingly, the wall thickness of the tower drum can be reduced to a certain extent, material cost is saved, and transportation is more convenient. Furthermore, the spliced tower sections are separated by steel wire meshes, so that maintenance and pouring are more convenient; uHPC has good corrosion resistance, and harm caused by concrete corrosion at the transverse joint can be reduced; only the two ends are reinforced through UHPC, and cost saving is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine towers, and in particular to a prefabricated tower reinforced with ultra-high performance concrete. Background Art

[0002] Wind energy is one of the most widely used clean energy sources, with relatively abundant resource distribution, efficient energy conversion rate, low cost, and relatively mature development. As the main tool for converting wind energy, wind turbines are constantly developing towards larger capacity, longer blades, and higher tower heights. As the tower height increases, the advantages of steel-concrete hybrid towers (referred to as "steel-concrete towers"), such as high rigidity, convenient installation and transportation, lower cost, and higher stability, gradually emerge. However, as the height increases, the deadweight of the structure and external loads increase, and the horizontal joints of the concrete tower sections (i.e., the joints between the upper and lower sections) have insufficient bearing capacity of the concrete tower sections due to hollowing of some structural glue, resulting in crushing and edge collapse. If the ultra-high wind turbine tower continues to use the current materials and structural forms, the wall thickness of the tower will continue to increase, and the difficulty of prefabrication, installation, and transportation will also increase. Ultra-High Performance Concrete (UHPC) has higher strength and can reduce the wall thickness and deadweight of concrete tower sections. However, if all concrete tower sections are made of UHPC, the cost will be greatly increased compared to ordinary concrete, so it is necessary to improve the existing tower structure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a prefabricated tower reinforced with ultra-high performance concrete, which can improve the bearing capacity between concrete ring segments in a steel-concrete tower, reduce the crushing phenomenon at the joints, help reduce the tower wall thickness, and facilitate installation and maintenance.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A prefabricated tower tube reinforced with ultra-high performance concrete comprises a plurality of tower sections spliced ​​vertically, wherein the tower sections comprise an ordinary concrete layer, an upper UHPC reinforcement layer arranged above the ordinary concrete layer, and a lower UHPC reinforcement layer arranged below the ordinary concrete layer.

[0006] As a further improvement of the above technical solution: the height range of the upper UHPC reinforcement layer and the lower UHPC reinforcement layer is 20 cm to 80 cm.

[0007] As a further improvement of the above technical solution: the height of the upper UHPC reinforcement layer and the lower UHPC reinforcement layer is 40 cm.

[0008] As a further improvement of the above technical solution: a partition is provided between the upper UHPC reinforcement layer and the ordinary concrete layer, and a partition is provided between the ordinary concrete layer and the lower UHPC reinforcement layer.

[0009] As a further improvement of the above technical solution: the separator is a wire mesh.

[0010] As a further improvement of the above technical solution: the tower section is formed by splicing two semicircular segments in the annular direction.

[0011] Compared with the prior art, the advantages of the present invention are as follows: the prefabricated tower reinforced with ultra-high performance concrete disclosed in the present invention is reinforced by arranging UHPC at the upper and lower ends of the ordinary concrete layer of the tower section, and the high-strength compressive resistance of UHPC can be used to improve the compressive bearing capacity of the tower at the transverse joints, improve the reliability of the transverse joints, and prevent the crushing and edge collapse caused by excessive local pressure of concrete. Moreover, since UHPC can improve the bearing capacity of the tower, the wall thickness of the tower can be reduced to a certain extent accordingly, making the subsequent on-site installation simpler and the maintenance more convenient. UHPC has good corrosion resistance and can reduce the harm caused by concrete corrosion at the transverse joints. Moreover, only the two ends of the tower section are reinforced with UHPC, which is conducive to cost saving.

[0012] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the prefabricated tower tube reinforced with ultra-high performance concrete of the present invention.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the tower section in the present invention.

[0015] Figure 3 It is a schematic diagram of the main structure of the tower section in the present invention.

[0016] Figure 4 It is a schematic diagram of the main cross-sectional structure of the tower section in the present invention.

[0017] Figure 5 It is a schematic diagram of the cross-sectional structure of a common concrete layer in the present invention.

[0018] Figure 6 It is a schematic diagram of the cross-sectional structure of the separator in the present invention.

[0019] Figure 7 It is a schematic diagram of the cross-sectional structure of the upper UHPC reinforcement layer in the present invention.

[0020] The symbols in the figure represent:

[0021] 1. Tower section; 2. Upper UHPC reinforcement layer; 3. Ordinary concrete layer; 4. Lower UHPC reinforcement layer; 5. Separator; 6. Circumferential reinforcement. DETAILED DESCRIPTION

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figures 1 to 7 An embodiment of a prefabricated tower reinforced with ultra-high performance concrete of the present invention is shown. The prefabricated tower reinforced with ultra-high performance concrete of this embodiment includes a plurality of tower sections 1 spliced ​​vertically, and the tower section 1 includes an ordinary concrete layer 3, an upper UHPC reinforcement layer 2 arranged above the ordinary concrete layer 3, and a lower UHPC reinforcement layer 4 arranged below the ordinary concrete layer 3, wherein UHPC is ultra-high performance concrete.

[0027] In the prefabricated tower reinforced with ultra-high performance concrete of the present embodiment, UHPC is arranged at the upper and lower ends of the ordinary concrete layer 3 of the tower section 1 for reinforcement. The high-strength compressive resistance of UHPC can be used to improve the compressive bearing capacity of the tower at the transverse joints, thereby improving the reliability of the transverse joints and preventing the crushing and edge collapse caused by excessive local pressure of concrete. In addition, since UHPC can improve the bearing capacity of the tower, the wall thickness of the tower can be reduced to a certain extent accordingly, making the subsequent on-site installation simpler and the maintenance more convenient. UHPC has good corrosion resistance and can reduce the harm caused by concrete corrosion at the transverse joints. And only the two ends of the tower section 1 are reinforced with UHPC, which is conducive to cost saving.

[0028] Preferably, the height range of the upper UHPC reinforcement layer 2 and the lower UHPC reinforcement layer 4 is 20 cm to 80 cm. UHPC in this height range can not only play a good reinforcement role, but also save costs.

[0029] Further preferably, in this embodiment, the height of the upper UHPC reinforcement layer 2 and the lower UHPC reinforcement layer 4 is 40 cm. Of course, in other embodiments, it can also be adjusted appropriately.

[0030] Furthermore, in this embodiment, a separator 5 is provided between the upper UHPC reinforcement layer 2 and the ordinary concrete layer 3, and a separator 5 is provided between the ordinary concrete layer 3 and the lower UHPC reinforcement layer 4. By providing the separator 5, the mutual interference between UHPC and ordinary concrete during precast casting can be effectively blocked, thereby avoiding affecting the strength of the two types of concrete.

[0031] As a preferred embodiment, the separator 5 is a steel wire mesh, which can effectively prevent the interference between UHPC and ordinary concrete during precast casting, while ensuring the integrity of the concrete tower tube and realizing the possibility of horizontal casting of concrete of different strengths.

[0032] See Figures 5 to 7 In this embodiment, the tower section 1 is formed by splicing two semicircular segments in the annular direction, which is convenient for transportation. After arriving at the site, the two semicircular segments are assembled into a whole tower section ring.

[0033] When prefabricating the tower tube, horizontal casting is adopted. First, the longitudinal steel bars 7 and the circumferential steel bars 6 are tied into a steel cage, and then two steel meshes are tied as separators 5 at 40 cm at both ends of the steel cage to form a complete steel cage. Then the complete steel cage is placed in a horizontal mold and fixed, and then concrete is poured after it is contained. When pouring, the middle ordinary concrete layer 3 is poured first, and then the UHPC at both ends is poured. Finally, the structure is demoulded after reaching a certain strength and can be put into use.

[0034] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A prefabricated tower tube reinforced with ultra-high performance concrete, comprising a plurality of tower sections (1) spliced ​​vertically, characterized in that: The tower section (1) comprises an ordinary concrete layer (3), an upper UHPC reinforcement layer (2) arranged above the ordinary concrete layer (3), and a lower UHPC reinforcement layer (4) arranged below the ordinary concrete layer (3).

2. The ultra-high performance concrete reinforced prefabricated tower according to claim 1, characterized in that: The heights of the upper UHPC reinforcement layer (2) and the lower UHPC reinforcement layer (4) range from 20 cm to 80 cm.

3. The ultra-high performance concrete reinforced prefabricated tower according to claim 2, characterized in that: The height of the upper UHPC reinforcement layer (2) and the lower UHPC reinforcement layer (4) is 40 cm.

4. The prefabricated tower reinforced with ultra-high performance concrete according to any one of claims 1 to 3, characterized in that: A separator (5) is provided between the upper UHPC reinforcement layer (2) and the ordinary concrete layer (3), and a separator (5) is provided between the ordinary concrete layer (3) and the lower UHPC reinforcement layer (4).

5. The ultra-high performance concrete reinforced prefabricated tower according to claim 4, characterized in that: The separator (5) is a steel wire mesh.

6. The prefabricated tower reinforced with ultra-high performance concrete according to any one of claims 1 to 3, characterized in that: The tower section (1) is formed by splicing two semicircular segments in the circumferential direction.

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