UHPC tower drum section and prestressed thin-wall UHPC wind power tower drum

Abstract

The utility model discloses a UHPC (Ultra High Performance Concrete) tower drum section which comprises at least two UHPC prefabricated assembly section pieces, and every two adjacent UHPC prefabricated assembly section pieces are connected through a vertical joint structure; the vertical joint structure comprises vertical arc-shaped notches, joint steel bars and cast-in-place UHPC, the vertical arc-shaped notches are formed in the adjacent vertical ends of the adjacent UHPC prefabricated assembly segments, the cast-in-place UHPC is located in a vertical cavity defined after the adjacent vertical arc-shaped notches are connected, one ends of the joint steel bars are located in the UHPC prefabricated assembly segments, and the other ends of the joint steel bars are located in the vertical cavity. And the other end of the steel pipe extends into the cast-in-place UHPC. The utility model further discloses the prestress thin-wall UHPC wind power tower drum. The interface contact area of the cast-in-place UHPC and the UHPC prefabricated assembly segment can be increased through the depth of the vertical arc-shaped notches and the extension length of the joint steel bars, the joint strength can be effectively enhanced, stress is reasonable, the joint cracking risk of the UHPC prefabricated assembly segment is reduced, the UHPC pouring and maintaining time is greatly shortened, and the construction efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wind power generation, especially relates to a tower section and wind power tower. BACKGROUND

[0002] Wind energy is the fastest growing emerging renewable energy in recent years, and large-capacity (>=5MW) fixed wind turbines have become an important growth point in the global wind power market. Traditional steel towers, as flexible towers, have small rigidity, and the construction cost and maintenance cost are both high. Traditional prestressed steel-concrete composite structures, combined with ordinary high-strength concrete, have the disadvantages of large component size, which is not conducive to transportation and installation, and joint fatigue cracking. With the rapid iteration of wind turbines and blades, the traditional tower scheme has gradually become difficult to adapt to the technical requirements of load and frequency.

[0003] A steel-UHPC combined wind power tower is disclosed in Chinese patent application document CN117685170A, which is a fabricated structure including multiple layers of combined tower sections stacked vertically, each combined tower section including multiple pieces of inner thin-walled steel and multiple pieces of UHPC outer tower, and the assembly joint between the multiple pieces of inner thin-walled steel and the multiple pieces of UHPC outer tower is the weakest part of the tower section. The construction form needs to consider the requirements of easy construction and reasonable stress performance. The vertical joints in this patent mainly use bolt connections and cast-in-place high-strength concrete, which have the defects of complex construction process and not firm enough connection. Therefore, there is an urgent need to propose a tower section with simple joint structure, reasonable stress, and simple construction. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology, and to provide a UHPC tower section with light self-weight, simple structure, reasonable stress, and convenient construction, and a prestressed thin-walled UHPC wind power tower.

[0005] To solve the above technical problems, the technical solution provided by the utility model is:

[0006] A UHPC tower drum segment, comprising at least two UHPC prefabricated assembly segments, and adjacent two of the UHPC prefabricated assembly segments are connected through a vertical joint structure; the vertical joint structure comprises a vertical arc-shaped notch, joint steel bars and cast-in-situ UHPC, the vertical arc-shaped notch is arranged at adjacent vertical ends of the adjacent UHPC prefabricated assembly segments (the vertical arc-shaped notch is arranged at each of the adjacent UHPC prefabricated assembly segments, and the vertical arc-shaped notch can be obtained by concave at the end of the UHPC prefabricated assembly segment, so that the shapes of the adjacent vertical arc-shaped notches are kept the same to facilitate accurate butt joint), the depth k of the vertical arc-shaped notch is not less than 5 times of the diameter of the joint steel bars, the cast-in-situ UHPC is arranged in a vertical cavity formed after the adjacent vertical arc-shaped notches are connected, one end of the joint steel bars is arranged in the UHPC prefabricated assembly segment, the other end of the joint steel bars extends into the cast-in-situ UHPC, and the other end of the joint steel bars extends out of the vertical end of the UHPC prefabricated assembly segment (i.e. extends into the vertical arc-shaped notch arranged in the other adjacent UHPC prefabricated assembly segment), and the distance h of the other end of the joint steel bars extending out of the vertical end of the UHPC prefabricated assembly segment is not less than 10 times of the diameter of the joint steel bars.

[0007] The vertical joint structure of the present application can guarantee the mechanical properties of the joint without setting other steel connecting members by adopting the vertical arc-shaped notch, the joint steel bars and the cast-in-situ UHPC and controlling the distribution mode of the joint steel bars and the depth of the vertical arc-shaped notch. Compared with the traditional plane joint, the contact area between the cast-in-situ UHPC and the UHPC prefabricated assembly segment is larger, the cross-section connection between the cast-in-situ UHPC and the UHPC prefabricated assembly segment is stronger, and the stress is more reasonable.

[0008] In the UHPC tower drum segment, preferably, the adjacent joint steel bars at the adjacent vertical ends of the adjacent UHPC prefabricated assembly segments are arranged in a staggered mode. The joint strength can be effectively enhanced by adopting the joint steel bars arranged in a staggered mode, and the mechanical properties of the joint can be improved.

[0009] In the UHPC tower drum segment, preferably, an elastic sealing rubber layer is arranged at the joint of the adjacent vertical arc-shaped notches. The sealing property of the joint of the adjacent vertical arc-shaped notches after being connected can be improved by arranging the elastic sealing rubber layer, so as to prevent slurry leakage during the casting of the cast-in-situ UHPC.

[0010] In the UHPC tower drum segment, preferably, the depth k of the vertical arc-shaped notch is not less than 6 times of the diameter of the joint steel bars. In the present application, the steel mesh can be arranged in the UHPC prefabricated assembly segment, and the joint steel bars can be the extended part of the steel mesh or be arranged in a pre-buried mode and be overlapped with the steel mesh, so as to improve the mechanical properties of the joint.

[0011] The construction method of the adjacent UHPC prefabricated assembly segments of the present application can be as follows:

[0012] Step S1: segmenting UHPC prefabricated assembly segments in a factory, and then transporting the UHPC prefabricated assembly segments to an installation site;

[0013] Step S2: hoisting the segmented UHPC prefabricated assembly segments to an assembly position (for example, the top surface of a lower UHPC tower drum segment), and spraying elastic sealant on the vertically adjacent contact end surfaces of adjacent segments, and then pouring UHPC into the vertical cavity formed after the adjacent vertical arc-shaped notches are connected, to assemble the adjacent UHPC prefabricated assembly segments into a whole UHPC tower drum segment.

[0014] As a general technical concept, the utility model also provides a prestressed thin-walled UHPC wind power tower drum, which comprises a plurality of UHPC tower drum segments as described above, the plurality of UHPC tower drum segments are vertically stacked and assembled into a whole tower drum, and the adjacent UHPC tower drum segments are connected by prestressed tendons. When the prestressed tendons are tensioned, at least one internal prestressed tendon is used to tension the topmost UHPC tower drum segment, and at least one internal prestressed tendon is used to tension the bottommost UHPC tower drum segment. The prestressed thin-walled UHPC wind power tower drum further comprises a tower drum foundation, the bottom of the whole tower drum is arranged on the tower drum foundation and connected thereto, and the at least one internal prestressed tendon is anchored on the tower drum foundation.

[0015] In the prestressed thin-walled UHPC wind power tower drum, preferably, the UHPC tower drum segment comprises a plurality of straight cylinder segments and at least one widening segment, the straight cylinder segments with the same diameter are arranged in sequence in the vertical direction, the straight cylinder segments with different diameters are connected by the widening segment, the diameter of the straight cylinder segment located above is smaller than the diameter of the straight cylinder segment located below, and the widening segment is a conical segment with a diameter gradually decreasing from bottom to top.

[0016] In the prestressed thin-walled UHPC wind power tower drum, preferably, the inner wall of the UHPC tower drum segment is uniformly and spacedly provided with a plurality of longitudinal ribs, the thickness of the longitudinal rib is 150-300mm, the longitudinal rib is provided with a vertical prestressed hole, and the prestressed tendon is arranged in the vertical prestressed hole.

[0017] Preferably, the longitudinal rib of one or more of the UHPC tower section segments is provided with an anchoring bracket for anchoring the prestressed tendon, the anchoring bracket is provided with an anchoring hole, and the anchoring hole and the vertical prestressed hole are in communication.

[0018] Preferably, the prestressed thin-walled UHPC wind turbine tower further comprises a steel adapter section and a steel tower section, and the steel tower section is arranged at the top of the overall tower through the steel adapter section.

[0019] Preferably, the outer diameter of the UHPC tower section segment is 5-10m, and the wall thickness of the UHPC tower section segment is 80-200mm.

[0020] The prestressed thin-walled UHPC wind turbine tower of the utility model adopts a UHPC tower section segment composed of a UHPC prefabricated component, fully utilizes the strength of UHPC, and under the premise of meeting the structural safety, UHPC has lower dosage and better performance than traditional concrete, only one layer of steel mesh is arranged in the tower section segment, the inner wall longitudinal rib can significantly improve the local rigidity and strength of the tower while facilitating the arrangement of the prestressed hole, and the dosage of UHPC and the self weight can be saved, so that the prestressed thin-walled UHPC wind turbine tower of the utility model has thinner thickness and lighter weight compared with the traditional tower, the light structure can reduce the resonance of the wind turbine tower, can adapt to higher load level, meet more stringent resonance frequency requirements, realize the balance of bearing capacity and frequency requirements, enhance the wind resistance stability of the structure, and expand the application range of the tower height.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] 1. The UHPC tower section and the prestressed thin-walled UHPC wind turbine tower have light weight, high compressive strength, excellent tensile and fatigue resistance, and can improve the overall strength, stiffness and fatigue resistance of the wind turbine tower. In the preferred scheme, longitudinal ribs are arranged in the UHPC tower section, which makes the tower wall thinner and facilitates the arrangement of prestressed tendons.

[0023] 2. The UHPC tower section and the prestressed thin-walled UHPC wind turbine tower are simple to prefabricate, have light self-weight, are convenient to transport and on-site assemble, have simple segment connection structure, are convenient to construct, and require only one pouring formwork when prefabricating and assembling the UHPC segments, the number of assembled segments can be adjusted according to different height requirements, the pouring formwork can be recycled multiple times, and the tower cost is saved.

[0024] 3. The UHPC tower section and the prestressed thin-walled UHPC wind turbine tower do not need to use bolts for vertical joint structure between assembled segments, have simple structure, the depth of the vertical arc-shaped notch and the extension length of the joint steel bars can increase the interface contact area of the cast-in-situ UHPC and the UHPC prefabricated assembled segment, can effectively enhance the joint strength, is reasonable in stress, reduces the risk of joint cracking of the UHPC prefabricated assembled segment, greatly reduces the UHPC pouring and maintenance time, and is high in construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 The structure diagram of the prestressed thin-walled UHPC wind turbine tower of the embodiment.

[0027] Figure 2 The structure diagram of the UHPC prefabricated assembled segment in the UHPC tower section of the embodiment.

[0028] Figure 3 The structure diagram of the connection of adjacent UHPC prefabricated assembled segments of the embodiment (without cast-in-situ UHPC).

[0029] Figure 4 The structure diagram of the UHPC tower section with an anchor bracket part of the embodiment.

[0030] LEGEND

[0031] 1, straight cylinder section; 1a, first straight cylinder section; 1b, second straight cylinder section; 2, widening section; 3, steel transition section; 4, steel tower cylinder section; 5, wind turbine generator; 11, UHPC prefabricated assembly segment; 111, vertical prestressed duct; 112, longitudinal rib; 113, vertical joint structure; 1131, joint reinforcement; 1132, vertical arc-shaped notch; 1133, elastic sealing glue layer; 114, anchoring bracket part; 1141, anchoring duct. DETAILED DESCRIPTION

[0032] For the convenience of understanding the present application, the present application will be described more fully below with reference to the accompanying drawings and preferred embodiments. The scope of the present application, however, is not limited to the specific embodiments described below.

[0033] It should be particularly noted that when an element is described as being "fixed to, connected to, or communicated with" another element, it can be directly fixed, connected, or communicated with the other element, or indirectly fixed, connected, or communicated with the other element through other intermediate connecting elements.

[0034] Unless otherwise defined, all technical terms used in the present application have the same meanings as commonly understood by one of ordinary skill in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present application.

[0035] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods.

[0036] Embodiment:

[0037] For example, Figure 2 and Figure 3As shown, the UHPC tower segment of this embodiment includes at least two prefabricated UHPC segments 11, which are connected by a vertical joint structure 113. The vertical joint structure 113 includes a vertical arc-shaped groove 1132, a joint reinforcement 1131, and cast-in-place UHPC. The vertical arc-shaped groove 1132 is formed at the adjacent vertical ends of adjacent prefabricated UHPC segments 11 (obtained by the inward indentation of the prefabricated UHPC segments 11). The depth k of the vertical arc-shaped groove 1132 is not less than 5 times the diameter of the joint reinforcement 1131 (within any of the above range). The UHPC is located in the vertical cavity formed by the connection of adjacent vertical arc-shaped slots 1132. One end of the joint reinforcement 1131 is located inside the UHPC precast assembly segment 11, and the other end extends into the cast-in-place UHPC and extends beyond the vertical end of the UHPC precast assembly segment 11. The distance h extending beyond the vertical end of the UHPC precast assembly segment 11 is not less than 10 times the diameter of the joint reinforcement 1131 (within the above range). The adjacent joint reinforcements 1131 at the vertical ends of adjacent UHPC precast assembly segments 11 are staggered. The diameter of the joint reinforcement 1131 can be between 12-16mm.

[0038] In this embodiment, in order to improve the sealing performance, when adjacent vertical arc-shaped slots 1132 are closed, an elastic sealing adhesive layer 1133 is provided at their joint.

[0039] like Figure 1 As shown, the prestressed thin-walled UHPC wind turbine tower of this embodiment includes multiple UHPC tower segments as described above. These multiple UHPC tower segments are vertically stacked and assembled into a single tower. Adjacent UHPC tower segments are connected by prestressing tendons. Each UHPC tower segment includes multiple straight cylindrical segments 1 and at least one widening segment 2. Multiple straight cylindrical segments 1 of the same diameter are arranged vertically in sequence, while straight cylindrical segments 1 of different diameters are connected by the widening segment 2. The diameter of the upper straight cylindrical segment 1 is smaller than that of the lower straight cylindrical segment 1. The widening segment 2 is a tapered segment whose diameter gradually decreases from bottom to top.

[0040] In this embodiment, the inner wall of the UHPC tower segment is provided with multiple longitudinal ribs 112 evenly spaced around the periphery. The thickness of the longitudinal ribs 112 is 150-300mm. Vertical prestressing channels 111 are provided in the longitudinal ribs 112, and the prestressing tendons are tensioned in the vertical prestressing channels 111.

[0041] like Figure 4As shown, in the embodiment, the longitudinal rib 112 of the plurality of UHPC tower drum segments is provided with an anchoring bracket part 114 for anchoring the prestressed tendon, the anchoring bracket part 114 is provided with an anchoring hole 1141, and the anchoring hole 1141 is in communication with the vertical prestressed hole 111. The UHPC tower drum segments with the anchoring bracket part 114 are uniformly and dispersedly arranged at different positions of the overall tower drum. The anchoring bracket part 114 is arranged on the surface of the longitudinal rib 112 and extends inwardly, the anchoring bracket part 114 is provided with a plurality of anchoring holes 1141, the top end of the anchoring hole 1141 is open at the upper end surface of the anchoring bracket part 114, and the anchoring hole 1141 is used for penetrating the in-vivo prestressed tendon.

[0042] More specifically, in the embodiment, the straight cylinder segment 1 is provided with two segments, and the widened segment 2 is provided with one segment. The straight cylinder segment 1 includes a first straight cylinder segment 1a and a second straight cylinder segment 1b. The first straight cylinder segment 1a is located above the second straight cylinder segment 1b, and the diameter of the first straight cylinder segment 1a is smaller than that of the second straight cylinder segment 1b. The top end of the widened segment 2 is connected to the bottom end of the first straight cylinder segment 1a, the bottom end of the widened segment 2 is connected to the top end of the second straight cylinder segment 1b, and the diameter of the widened segment 2 gradually decreases from bottom to top. In other words, in the embodiment, the diameter of the straight cylinder segment 1 is gradually reduced from bottom to top. Figure 1 In the example shown, the straight cylinder segment 1 is provided with two segments, and the tower drum segment is constructed as straight cylinder segment 1-widened segment 2-straight cylinder segment 1 from bottom to top.

[0043] Alternatively, in other embodiments, the number of the straight cylinder segment 1 and the widened segment 2 can be other, for example, the straight cylinder segment 1 is divided into three segments, and the widened segment 2 is divided into two segments. In the vertical direction, the straight cylinder segment 1 and the widened segment 2 are arranged alternately, and the tower drum segment is constructed as straight cylinder segment 1-widened segment 2-straight cylinder segment 1-widened segment 2-straight cylinder segment 1 from bottom to top.

[0044] The first straight cylinder segment 1a and the second straight cylinder segment 1b each include a plurality of UHPC tower drum segments connected in sequence in the vertical direction. It can be understood that the diameters of the plurality of UHPC tower drum segments in the first straight cylinder segment 1a are the same, and the diameters of the plurality of UHPC tower drum segments in the second straight cylinder segment 1b are the same.

[0045] In the prestressed tendon laying, the second straight cylinder section 1b corresponds to the tensioned prestressed tendon, the starting point can be the tower base on the ground, and the ending point is on the UHPC tower section at the top end, the first straight cylinder section 1a corresponds to the tensioned prestressed tendon, the starting point can be the tower base on the ground, and the ending point is on the UHPC tower section at the top end. That is, the UHPC tower section at the top end of the second straight cylinder section 1b can adopt the UHPC tower section with the anchoring bracket part 114, and the UHPC tower section at the top end of the first straight cylinder section 1a can also adopt the UHPC tower section with the anchoring bracket part 114. Of course, the UHPC tower section with the anchoring bracket part 114 can also be arranged at the middle part or other positions of the first straight cylinder section 1a and the second straight cylinder section 1b, and according to different engineering calculation requirements, the number of anchoring pipe sections in the first straight cylinder section 1a and the second straight cylinder section 1b can be dynamically adjusted to tension different numbers of prestressed tendons.

[0046] In the embodiment, the steel transition section 3 and the steel tower section 4 are also included, the steel tower section 4 is arranged at the top of the whole tower through the steel transition section 3, and the wind turbine 5 is arranged on the steel tower section 4. The prestressed thin-wall UHPC wind tower in the embodiment adopts a steel-UHPC combined structure, the bottom of the prestressed thin-wall UHPC wind tower is a UHPC prefabricated component, the middle part is transitioned through the steel transition section 3, and the top is composed of the steel tower section 4. The steel tower section 4 connected at the top further improves the height of the prestressed thin-wall UHPC wind tower, and the steel tower section has low cost and high construction efficiency.

[0047] In the embodiment, the outer diameter of the UHPC tower section is 5-10 m, and the wall thickness of the UHPC tower section is 80-200 mm. The UHPC tower section in the prestressed thin-wall UHPC wind tower in the embodiment is prepared by using UHPC, so that the outer diameter and the wall thickness of the UHPC tower section in the embodiment are obviously smaller than the outer diameter of the traditional concrete tower of the same specification unit in the related art under the premise of meeting the structural safety, and the quality is lighter, and the transportation and assembly are easier.

[0048] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the art, without departing from the technical principles of the utility model, some improvements and decorations can be made, and these improvements and decorations should also be considered within the protection scope of the utility model.

Claims

1. A UHPC tower drum segment, characterized by, The UHPC tower section comprises a plurality of straight cylinder segments (1) and at least one variable-width segment (2), a plurality of straight cylinder segments (1) of the same diameter are arranged in sequence in the vertical direction, the straight cylinder segments (1) of different diameters are connected through the variable-width segment (2), and the diameter of the straight cylinder segment (1) located above is smaller than the diameter of the straight cylinder segment (1) located below, and the variable-width segment (2) is a conical segment with a diameter gradually decreasing from bottom to top.

2. The UHPC tower section of claim 1, wherein, The adjacent joint steel bars (1131) of the vertical end portions of the adjacent UHPC prefabricated assembly segments (11) are arranged in a staggered manner.

3. The UHPC tower section of claim 1, wherein, An elastic sealing rubber layer (1133) is arranged at the joint between the adjacent vertical arc-shaped notches (1132).

4. A prestressed thin-walled UHPC wind turbine tower section, characterized in that, The UHPC tower section comprises a plurality of straight cylinder segments (1) and at least one variable-width segment (2), a plurality of straight cylinder segments (1) of the same diameter are arranged in sequence in the vertical direction, the straight cylinder segments (1) of different diameters are connected through the variable-width segment (2), and the diameter of the straight cylinder segment (1) located above is smaller than the diameter of the straight cylinder segment (1) located below, and the variable-width segment (2) is a conical segment with a diameter gradually decreasing from bottom to top.

5. The pre-stressed thin-walled UHPC wind turbine tower of claim 4, wherein, The inner wall of the UHPC tower section is uniformly and spacedly provided with a plurality of longitudinal ribs (112), the thickness of the longitudinal rib (112) is 150-300 mm, and the longitudinal rib (112) is provided with a vertical prestressed hole (111).

6. The pre-stressed thin-walled UHPC wind turbine tower of claim 4, wherein, One or more longitudinal ribs (112) of the UHPC tower section are provided with an anchoring bracket portion (114) for anchoring the prestressed steel bar, the anchoring bracket portion (114) is provided with an anchoring hole (1141), and the anchoring hole (1141) and the vertical prestressed hole (111) are communicated.

7. The pre-stressed thin-walled UHPC wind turbine tower of claim 6, wherein, The UHPC tower section with the anchoring bracket portion (114) is provided in multiple and uniformly dispersed at different positions of the whole tower.

8. The pre-stressed thin-walled UHPC wind turbine tower according to claim 7, characterized in that, Further comprising a steel transition segment (3) and a steel tower segment (4), the steel tower segment (4) is arranged at the top of the whole tower through the steel transition segment (3).

9. The pre-stressed thin-walled UHPC wind turbine tower of claim 4, wherein, ​ 10. The pre-stressed thin-walled UHPC wind turbine tower of claim 4, wherein, The outer diameter of the UHPC tower drum segment is 5-10 m, and the wall thickness of the UHPC tower drum segment is 80-200 mm.

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