Wind power concrete tower drum section and wind power steel-concrete mixed tower drum

Abstract

The utility model discloses a wind power concrete tower drum section and a wind power steel-concrete mixed tower drum, which comprise a bottom conical tower drum section, a middle straight tower drum section and a top conical tower drum section which are sequentially arranged from bottom to top, and the initial height of the bottom end of the middle straight tower drum section is determined according to the position of a blade tip. The structure comprises a plurality of pipe joint assemblies which are sequentially arranged from bottom to top, the wall thicknesses of the pipe joint assemblies are sequentially reduced from bottom to top along with the change of a load rule, and a circle of brackets for anchoring segmented prestressed steel strands are arranged on the inner wall of the middle straight tower barrel section at the preset height position along the circumference. First PVC buried pipes used for installing segmented prestressed steel strands are pre-buried in the corbels, second PVC buried pipes used for installing prestressed steel strands are pre-buried in the top conical tower drum section, and the first PVC buried pipes and the second PVC buried pipes are arranged in a space staggered mode. On the premise that the strength of the tower drum is met, the universality of the mold can be effectively improved, and the manufacturing cost of the mixed tower is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power towers, in particular to a wind power concrete tower section and a wind power steel-concrete mixed tower. Background Art

[0002] With the continuous advancement of wind power technology, the rapid expansion of wind power scale, the continuous reduction of wind power cost per kilowatt-hour, and fierce competition, wind turbines have entered the era of full parity. Wind turbine models are rapidly developing in the direction of high power. The trend of large-scale single-machine power has posed a great challenge to wind turbine towers. The new generation of towers needs to have stronger structural strength to meet the requirements of tower height in different regions and be more economical. Therefore, cost reduction and efficiency improvement of towers have become the focus of development.

[0003] Prefabricated wind turbine steel-concrete hybrid towers are widely used due to their superior stability, fatigue resistance, low resonance, and cost compared to steel towers. Wind turbine steel-concrete hybrid towers typically consist of two sections: a concrete tower section at the bottom and a traditional steel tower section at the top.

[0004] Currently, most concrete tower sections on the market are prefabricated in sections. Due to the fact that the bending moment is greatest at the bottom of the tower and smallest at the top, most concrete tower sections are conical in shape, with a large diameter at the bottom and a small diameter at the top. The diameter of the middle ring section gradually changes, and the wall thickness also changes accordingly with the height. However, conical concrete towers have the following problems:

[0005] 1. With the application of long-bladed large-capacity units, the deformation of the blades also increases with the increase of length. In order to meet the load requirements at the tip of the blade, the tower bearing capacity can only be increased by adjusting the thickness of the tower wall, resulting in excessive use of concrete and steel bars and poor economic efficiency.

[0006] 2. The wall thickness and diameter of each section of the conical mixing tower are different, so each pipe section requires a set of molds, and the versatility of the molds is poor.

[0007] 3. In order to meet the demand for higher tower height, it is usually adopted to extend the tube section at the bottom of the original tower. This will make the bottom diameter larger, increase the land area and reduce economic efficiency.

[0008] 4. When a segmented steel strand arrangement is used on a conical tower, the sizes of the brackets for anchoring the steel strands cannot be universal in order to connect with the adjacent tower walls, and their positions cannot be flexibly adjusted.

[0009] In order to improve the versatility of the mold and reduce the manufacturing cost of the mixed tower, there are some straight cylindrical concrete towers on the market. The existing straight towers were originally designed to reduce the investment in molds. The outer diameter and wall thickness of each pipe section are exactly the same, but this will undoubtedly cause material waste, and such a design has great limitations on the body size. In order to meet the requirements of strength and blade tip position, and to ensure the consistency of the overall tower diameter and wall thickness, the overall tower diameter is often smaller, resulting in a very thick wall and increased material consumption. Utility Model Content

[0010] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wind power concrete tower section that can effectively improve the versatility of the mold and reduce the manufacturing cost of the concrete tower while meeting the tower strength requirements.

[0011] Another object of the present invention is to provide a wind power steel-concrete hybrid tower.

[0012] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0013] A wind power concrete tower section comprises a bottom conical tower section, an intermediate straight tower section and a top conical tower section which are arranged in sequence from bottom to top, wherein the top outer diameter of the bottom conical tower section and the bottom outer diameter of the top conical tower section are respectively equal to the outer diameter of the intermediate straight tower section, and the starting height of the bottom end of the intermediate straight tower section is determined according to the position of the blade tip. The section comprises a plurality of pipe segment assemblies which are arranged in sequence from bottom to top, and the wall thickness of the plurality of pipe segment assemblies decreases from bottom to top as the load law changes. The inner wall of the intermediate straight tower section is provided with a circle of brackets for anchoring segmented prestressed steel strands along the circumference at a preset height position, a first PVC buried pipe for installing segmented prestressed steel strands is pre-buried in the brackets, and a second PVC buried pipe for installing prestressed steel strands is pre-buried in the top conical tower section, and the first PVC buried pipe and the second PVC buried pipe are spatially staggered.

[0014] Furthermore, the top conical tower section includes an upper steel-concrete conversion section and a lower conical barrel section connected to each other. The wall thickness of the upper steel-concrete conversion section is greater than that of the lower conical barrel section. It includes conversion section concrete and a steel base plate. A plurality of connecting bolts for connecting the bottom flange of the steel tower section are pre-embedded in the conversion section concrete. The steel base plate is cast on the top of the conversion section concrete with high-strength grouting material. A plurality of second PVC buried pipes for installing prestressed steel strands are pre-embedded in the conversion section concrete and the steel base plate. The plurality of second PVC buried pipes are arranged at intervals along the circumference.

[0015] Furthermore, the bottom flange includes a flange body, which is connected to the steel base plate by connecting bolts. The flange body is preset with multiple channels for installing prestressed steel strands, and the multiple channels are aligned one by one with multiple second PVC buried pipes. The top of the flange body is evenly arranged with multiple stiffening ribs along the circumference for enhancing structural strength.

[0016] Furthermore, the wall thickness of the lower conical cylinder section ranges from 250mm to 360mm, and the height ranges from 10m to 15m; the wall thickness of the upper steel-concrete conversion section ranges from 400mm to 650mm, and the diameter ranges from 4.5m to 6.5m.

[0017] Furthermore, the corbels protrude radially inward on the inner wall of the middle straight tower section and are evenly arranged in a "teeth-like" manner.

[0018] Furthermore, there are 4 to 8 groups of pipe segment assemblies, each of which includes multiple pipe segments with the same wall thickness, and the multiple pipe segments are spliced ​​in sequence from bottom to top.

[0019] Furthermore, the diameter of the middle straight tower section ranges from 7.0m to 9.0m, and the wall thickness ranges from 200mm to 280mm.

[0020] Furthermore, the diameter of the bottom conical tower section ranges from 8.0m to 13.0m, and the wall thickness ranges from 240mm to 360mm.

[0021] Another purpose of the utility model can be achieved by adopting the following technical solutions:

[0022] A wind power steel-concrete hybrid tower, characterized in that it includes a foundation, a steel tower section, a prestressed steel strand, a segmented prestressed steel strand and a wind power concrete tower section, the bottom of the steel tower section is connected to the top of the wind power concrete tower section through its bottom flange, the bottom of the wind power concrete tower section is fixed to the top of the foundation, the top of the prestressed steel strand passes through the second PVC buried pipe of the wind power concrete tower section and is anchored at the top of the wind power concrete tower section, and its bottom end is anchored at the bottom of the foundation, the top of the segmented prestressed steel strand passes through the first PVC buried pipe of the wind power concrete tower section and is anchored on the corbel, the segmented prestressed steel strand extends downward close to the inner wall of the middle straight tower section and anchors its bottom end to the bottom of the foundation, thereby connecting the steel tower section, the wind power concrete tower section and the foundation into a whole.

[0023] Furthermore, the top surface of the foundation is provided with an installation groove for installing a wind power concrete tower section, a cylindrical cavity is formed inside the foundation, the top of the cylindrical cavity forms a pedestal cantilevered toward the center of the foundation, and a plurality of reserved channels are arranged circumferentially inside the pedestal for serving as anchor bases for prestressed steel strands and segmented prestressed steel strands.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] 1. The utility model adopts a straight tower section design with the same diameter above the blade tip position, and a tapered section design below the blade tip position and at the top near the steel-concrete conversion section. The wall thickness of the straight tower section changes with the load law. Under the premise of meeting the tower load strength, it can effectively reduce the amount of concrete and steel bars used, and has good economy.

[0026] 2. The straight tower sections of the present invention can be divided into multiple groups according to different wall thicknesses, which can meet the strength requirements of different levels. At the same time, the pipe sections in each group have the same diameter and can be prefabricated using a universal mold, which has low production costs, saves materials, improves economy, and is conducive to the efficient development of standardized hybrid towers.

[0027] 3. The straight tower section design of the present invention can flexibly adjust the height and number of straight tube sections within a large height range due to its characteristic of the same diameter, meeting the requirements of different tower heights, and adjusting the tower height by adding tube sections to avoid increasing the land acquisition area.

[0028] 4. The straight tower section design of the utility model allows the installation position of the bracket to be flexibly arranged within a large height range, meeting the needs of arranging segmented steel strands at different positions, and provides a universal bracket design with low material consumption and low cost.

[0029] 5. The innovative design of the upper steel-concrete conversion section and the bottom flange of the utility model can effectively ensure the connection strength of the steel-concrete tower connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the wind turbine concrete tower section.

[0031] Figure 2 for Figure 1 Middle AA section view.

[0032] Figure 3 for Figure 2 Middle DD section view.

[0033] Figure 4 for Figure 2 EE section view.

[0034] Figure 5 for Figure 2 Middle FF section view.

[0035] Figure 6 for Figure 1 Middle BB section view.

[0036] Figure 7 for Figure 6 Middle GG section view.

[0037] Figure 8 for Figure 6 Middle HH section view.

[0038] Figure 9 This is a schematic diagram of the local structure of the middle straight tower section.

[0039] Figure 10 This is a structural diagram of the top conical tower section.

[0040] Figure 11 This is a structural diagram of the bottom conical tower section. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Example 1:

[0043] like Figures 1 to 11 As shown, this embodiment provides a wind power concrete tower section, including a bottom conical tower section 1, an intermediate straight tower section 2 and a top conical tower section arranged in sequence from bottom to top, the top outer diameter of the bottom conical tower section 1 and the bottom outer diameter of the top conical tower section are respectively equal to the outer diameter of the intermediate straight tower section 2, the starting height of the bottom end of the intermediate straight tower section 2 is determined according to the position of the blade tip, and it includes a plurality of pipe segment assemblies 201 arranged in sequence from bottom to top, the wall thickness of the plurality of pipe segment assemblies 201 decreases from bottom to top as the load law changes, and the inner wall of the intermediate straight tower section 2 is circumferentially arranged at a preset height position. A circle of corbels 202 are provided for anchoring the segmented prestressed steel strands 7, and the specific height can be set according to the load strength requirement of the tower. The corbels 202 protrude radially inward on the inner wall of the middle straight tower section 2 and are evenly arranged in a "tooth-like" shape. A first PVC buried pipe 203 for installing the segmented prestressed steel strands 7 is pre-buried in the corbel 202, and the buried pipe diameter is 100mm~135mm. A second PVC buried pipe 404 for installing the prestressed steel strand 6 is pre-buried in the top conical tower section, and the first PVC buried pipe 203 and the second PVC buried pipe 404 are spatially staggered.

[0044] Specifically, the top conical tower section includes a connected lower conical cylinder section 3 and an upper steel-concrete conversion section 4. The wall thickness of the upper steel-concrete conversion section 4 is greater than the wall thickness of the lower conical cylinder section 3. It includes a conversion section concrete 401 and a steel pad 402. A plurality of connecting bolts 403 for connecting the bottom flange 8 of the steel tower section are pre-embedded inside the conversion section concrete 401. The steel pad 402 is cast on the top of the conversion section concrete 401 with high-strength grouting material. A plurality of second PVC buried pipes 404 for installing prestressed steel strands 6 are pre-embedded in the conversion section concrete 401 and the steel pad 402. The plurality of second PVC buried pipes 404 are arranged at intervals along the circumference.

[0045] The wall thickness of the lower conical cylinder section 3 ranges from 250mm to 360mm, and the height ranges from 10m to 15m; the wall thickness of the upper steel-concrete conversion section 4 ranges from 400mm to 650mm, and the diameter ranges from 4.5m to 6.5m. The upper steel-concrete conversion section 4 is a full-ring structure, which is prefabricated in the prefabrication yard, transported to the site, and hoisted to the designed position.

[0046] The bottom flange 8 includes a flange body 801, which is connected to the steel base plate 402 by connecting bolts 403. A plurality of holes for installing prestressed steel strands 6 are preset in the flange body 801. The plurality of holes are aligned one by one with the plurality of second PVC buried pipes 404. By tightening the connecting bolts 403 and anchoring the prestressed steel strands 6, the connection between the upper steel-concrete conversion section 4 and the flange body 801 is strengthened. A plurality of stiffening ribs 802 are evenly arranged along the circumference on the top of the flange body 801 to strengthen the strength of the flange and prevent deformation.

[0047] The diameter of the middle vertical tower section 2 ranges from 7.0m to 9.0m, and the wall thickness ranges from 200mm to 280mm. There are 4 to 8 groups of pipe segment assemblies 201, each of which includes multiple pipe segments of the same wall thickness, which are spliced ​​sequentially from bottom to top.

[0048] The diameter of the bottom conical tower section 1 ranges from 8.0m to 13.0m, and the wall thickness ranges from 240mm to 360mm.

[0049] Example 2:

[0050] This embodiment provides a wind power steel-concrete hybrid tower, including a foundation 5, a steel tower section, a prestressed steel strand 6, a segmented prestressed steel strand 7 and the wind power concrete tower section described in Example 1. The bottom of the steel tower section is connected to the top of the wind power concrete tower section through its bottom flange 8. The bottom of the wind power concrete tower section is fixed to the top of the foundation 5. The top of the prestressed steel strand 6 passes through the second PVC buried pipe 404 of the wind power concrete tower section and is anchored at the top of the wind power concrete tower section. The bottom end of the prestressed steel strand 6 is anchored at the bottom of the foundation 5. The top of the segmented prestressed steel strand 7 passes through the first PVC buried pipe 203 of the wind power concrete tower section and is anchored on the corbel 202, so that the segmented prestressed steel strand 7 extends downward closely against the inner wall of the middle straight tower section 2 and its bottom end is anchored at the bottom of the foundation 5, thereby connecting the steel tower section, the wind power concrete tower section and the foundation 5 into a whole.

[0051] The top surface of the foundation 5 is provided with an installation groove 501 for installing the wind turbine concrete tower section, and a cylindrical cavity 502 is formed inside the cylindrical cavity. The top of the cylindrical cavity forms a base 503 cantilevered toward the center of the foundation 5. A plurality of reserved channels 504 are arranged circumferentially inside the base as anchoring bases for the prestressed steel strands 6 and the segmented prestressed steel strands 7.

[0052] The construction steps of the above-mentioned wind turbine concrete tower section are as follows:

[0053] Taking a 114m-tall concrete wind turbine tower section as an example, the blade tip is located at 25m. The bottom tapered tower section has an elevation range of 0m to 25m, a diameter of 10.1m to 7.8m, and a wall thickness of 250mm. The middle straight tower section has an elevation range of 25m to 95m, a diameter of 7.8m, and four wall thicknesses: 250mm, 240mm, 220mm, and 200mm. The top tapered tower section has an elevation range of 95m to 112.5m, a diameter of 7.8m to 5.8m, and a wall thickness of 250mm.

[0054] First, the wind turbine concrete tower section is horizontally segmented with a segment height of 2.5m. Then the entire tower ring is vertically segmented into 4 segments. The pipe segments are prefabricated in a precast concrete factory and then transported to the wind farm. The segments of each ring are spliced ​​into a ring using arc bolts and staggered installation is performed by hoisting them section by section.

[0055] The corbel is installed at an elevation of 30m on the wind turbine concrete tower section. After the tower section is hoisted to the 30m ring section, the corbel is installed. Positioning embedded parts are set on the top of each ring section and epoxy resin is applied for connection. After the hoisting is completed, the segmented prestressed steel strands are installed and the tensioning of the first-level steel strands is started.

[0056] Continue hoisting until it reaches an elevation of 112.5m, and start hoisting the upper steel-concrete conversion section. The upper steel-concrete conversion section has a height of 1.5m, a bottom diameter of 5.5m, a top diameter of 5.0m, a uniform transition in the middle diameter, and a thickness of 550mm to 480mm. A steel plate is set on the top, and pre-buried connecting bolts (bolt model is M52) are poured together with the conversion section concrete through high-strength grouting material.

[0057] Install the bottom flange and anchor the connecting bolts. The outer diameter of the bottom flange is 5.0 mm, the thickness is 140 mm, and the width is 480 mm. The height of the stiffening rib plate on the flange is 300 mm. Install the prestressed steel strands and perform the second-level steel strand tensioning to connect the above components into a whole.

[0058] Comparing the wind turbine concrete tower section of this embodiment with the traditional conical tower (evaluated at the same height and the same load), the concrete volume of the wind turbine concrete tower section of this embodiment is reduced by at least 50m 3 Compared with the traditional conical tower type annular corbel, the concrete volume of the corbel in this embodiment is reduced by at least 8m 3 , and the adjustment range of the bracket installation height is larger, and it can be installed inside the entire middle straight tower section; this embodiment adopts the method of jointly arranging prestressed steel strands and segmented prestressed steel strands, which can greatly reduce the amount of steel used than the scheme of arranging steel strands along the entire length, reducing the amount by at least 10 tons, thereby greatly reducing the manufacturing cost of the mixed tower.

[0059] The above is only a preferred embodiment of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present utility model patent based on the technical solution and the utility model patent concept of the present utility model patent, which falls within the protection scope of the present utility model patent.

Claims

1. A wind power concrete tower section, characterized by: It includes a bottom conical tower section, an intermediate straight tower section and a top conical tower section which are arranged in sequence from bottom to top. The top outer diameter of the bottom conical tower section and the bottom outer diameter of the top conical tower section are respectively equal to the outer diameter of the intermediate straight tower section. The starting height of the bottom end of the intermediate straight tower section is determined according to the position of the blade tip. It includes a plurality of pipe segment assemblies which are arranged in sequence from bottom to top. The wall thickness of the plurality of pipe segment assemblies decreases from bottom to top as the load law changes. The inner wall of the intermediate straight tower section is provided with a circle of brackets for anchoring segmented prestressed steel strands along the circumference at a preset height position. A first PVC buried pipe for installing segmented prestressed steel strands is pre-buried in the brackets. A second PVC buried pipe for installing prestressed steel strands is pre-buried in the top conical tower section. The first PVC buried pipe and the second PVC buried pipe are spatially staggered.

2. The wind power concrete tower section according to claim 1, characterized in that: The top conical tower section includes an upper steel-concrete conversion section and a lower conical barrel section connected to each other. The wall thickness of the upper steel-concrete conversion section is greater than that of the lower conical barrel section. It includes conversion section concrete and a steel base plate. A plurality of connecting bolts for connecting the bottom flange of the steel tower section are pre-embedded in the conversion section concrete. The steel base plate is cast on the top of the conversion section concrete with high-strength grouting material. A plurality of second PVC buried pipes for installing prestressed steel strands are pre-embedded in the conversion section concrete and the steel base plate. The plurality of second PVC buried pipes are arranged at intervals along the circumferential direction.

3. The wind power concrete tower section according to claim 2, characterized in that: The bottom flange includes a flange body, which is connected to the steel base plate by connecting bolts. The flange body is preset with multiple channels for installing prestressed steel strands. The multiple channels are aligned one by one with multiple second PVC buried pipes. The top of the flange body is evenly arranged with multiple stiffening ribs along the circumference for enhancing structural strength.

4. The wind power concrete tower section according to claim 2, characterized in that: The wall thickness of the lower conical cylinder section ranges from 250mm to 360mm, and the height ranges from 10m to 15m. The wall thickness of the upper steel-concrete conversion section ranges from 400mm to 650mm, and the diameter ranges from 4.5m to 6.5m.

5. The wind power concrete tower section according to claim 1, characterized in that: The brackets protrude radially inward on the inner wall of the middle straight tower section and are evenly arranged in a "teeth-like" shape.

6. The wind power concrete tower section according to claim 1, characterized in that: There are 4 to 8 groups of pipe segment assemblies, each of which includes multiple pipe segments with the same wall thickness, and the multiple pipe segments are spliced ​​in sequence from bottom to top.

7. The wind power concrete tower section according to claim 1, characterized in that: The diameter of the middle straight tower section ranges from 7.0m to 9.0m, and the wall thickness ranges from 200mm to 280mm.

8. The wind power concrete tower section according to claim 1, characterized in that: The diameter of the bottom conical tower section ranges from 8.0m to 13.0m, and the wall thickness ranges from 240mm to 360mm.

9. A wind power steel-concrete hybrid tower, characterized by: It includes a foundation, a steel tower section, a prestressed steel strand, a segmented prestressed steel strand and a wind power concrete tower section according to any one of claims 1 to 8, the bottom of the steel tower section is connected to the top of the wind power concrete tower section through its bottom flange, the bottom of the wind power concrete tower section is fixed to the top of the foundation, the top of the prestressed steel strand passes through the second PVC buried pipe of the wind power concrete tower section and is anchored at the top of the wind power concrete tower section, and its bottom end is anchored at the bottom of the foundation, the top of the segmented prestressed steel strand passes through the first PVC buried pipe of the wind power concrete tower section and is anchored on the corbel, the segmented prestressed steel strand extends downward close to the inner wall of the middle straight tower section and anchors its bottom end to the bottom of the foundation, thereby connecting the steel tower section, the wind power concrete tower section and the foundation into a whole.

10. The wind power steel-concrete hybrid tower according to claim 9, characterized in that: The top surface of the foundation is provided with an installation groove for installing the wind power concrete tower section, and a cylindrical cavity is formed inside the foundation. The top of the cylindrical cavity forms a pedestal cantilevered toward the center of the foundation. The pedestal is provided with a plurality of reserved channels along the circumference for serving as anchor bases for prestressed steel strands and segmented prestressed steel strands.

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