A kind of always tensioned prestressed cable structure for wind power

Abstract

The present application relates to the technical field of wind power, in particular to a kind of always tensioned prestressed cable-stayed cable structure for wind power, including cable anchor fixed component, multiple lower cables and multiple upper cables, the upper end of the lower cable and the lower end of the upper cable are connected with the cable anchor fixed component respectively;Multiple lower cable lower end is anchored to ground, and the cable anchor fixed component is suspended in hollow tower body by multiple upper cables;After the practical application of the present application, the stability and safety of the tower body as a whole can be effectively enhanced, and the present application uses less material, has high economic benefits, and can improve the space utilization rate of tower body, at the same time, the overall structure of the present application is simple and efficient, and the post-operation is convenient, has good use prospect and economic benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power technology, in particular to a wind power pre-stressed cable-stayed structure with constant tension. BACKGROUND

[0002] With the enhancement of environmental awareness, the public's recognition and acceptance of clean energy gradually increase. As a low-carbon and environmentally friendly power generation method, wind power generation is gaining more and more support and becoming an important part of the renewable energy field. Wind turbine generators are generally installed above the tower body. Common tower bodies are mostly two-section types, one of which is a steel tower cylinder in the upper half and a lattice tower in the lower half; the other is a steel tower cylinder in the upper half and a concrete tower cylinder in the lower half; and there is also a one-section type of all-steel tower cylinder in engineering applications. With the rapid development of the wind power industry, wind turbine generators are becoming more and more powerful, and high towers are gradually becoming a development trend. As the height of the tower body increases, the requirements for its stability and safety also increase. At this time, the measure of laying cable-stayed on the tower body to enhance the safety and stability of the tower structure becomes an efficient, economical and practical structure enhancement method. Laying tower cables can effectively disperse external loads such as wind force and seismic force on the tower, reduce the shaking and vibration of the tower, and improve the overall stress condition of the tower. However, the existing cable-stayed structure mostly adopts the connection form of welding an ear seat on the outer circumferential side wall of the tower (such as the steel tower cylinder section) to connect the cable with the tower or installing a component in the hollow cavity of the tower to fix the cable. Although these connection methods can meet the connection requirements of the tower and the cable, the cable will slacken when the tower is subjected to external load, resulting in a decrease in the stability of the tower.

[0003] Therefore, there is a need for a new cable connection method to ensure that the cable does not slacken when the tower is subjected to external load to ensure the continuous stability of the tower. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a wind power pre-stressed cable-stayed structure with constant tension to solve the technical problems of instability and low safety of the lattice tower body in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a wind power pre-stressed cable-stayed structure with constant tension, which comprises a cable anchor fixing component, a plurality of lower cables and a plurality of upper cables, the upper ends of the lower cables and the lower ends of the upper cables are respectively connected with the cable anchor fixing component; the lower ends of the plurality of lower cables are anchored to the ground, and the cable anchor fixing component is suspended in the hollow tower body through the plurality of upper cables.

[0006] Optionally, the cable anchor fixing member is provided with a plurality of anchor holes A and anchor holes B, the upper end of the lower cable is inserted into the anchor hole A and anchored on the cable anchor fixing member, and the lower end of the upper cable is inserted into the anchor hole B and anchored on the cable anchor fixing member.

[0007] Optionally, the plurality of anchor holes A and the plurality of anchor holes B are arranged at equal intervals.

[0008] Optionally, the plurality of anchor holes A and the plurality of anchor holes B are arranged at equal intervals.

[0009] Optionally, the anchor hole A and the anchor hole B have an inclination, and the upper end of the plurality of anchor holes A and the plurality of anchor holes B is more concentrated than the lower end.

[0010] Optionally, the top of the cable anchor fixing member is provided with a stabilizing groove for stabilizing the lower cable, and the stabilizing groove corresponds to the anchor hole A one by one; the stabilizing groove has an anchoring surface, and the upper end of the anchor hole A is located in the middle of the anchoring surface.

[0011] Optionally, the anchoring surface is inclined relative to the upper end surface of the cable anchor fixing member.

[0012] Optionally, the cable anchor fixing member is provided with a cavity in the middle, and the cavity penetrates the upper and lower ends of the cable anchor fixing member; the stabilizing groove is located at the junction of the inner wall and the top of the cable anchor fixing member.

[0013] Optionally, the cable anchor fixing member is a generally annular structure.

[0014] Optionally, the diameter of the inner wall of the upper end of the cable anchor fixing member gradually increases from bottom to top.

[0015] After the practical application of the application, the cable anchor fixing part is hung in the hollow tower body through a plurality of upper cables, the lower cable is pre-tensioned to form prestress, when the tower body is subjected to lateral external force (such as wind force) or seismic load, the tower body will tilt or sway in a certain direction, because the upper cable has large rigidity and small tilt angle, and the upper cable mainly conducts vertical force, so the cable anchor fixing part connected with the upper cable will move in the direction of the tower body sway, thereby changing the stress condition of the lower cable, when the stress of one / multiple lower cables is reduced, the tension of the remaining lower cables is redistributed through the cable anchor fixing part, which is a dynamic balance self-adaptive process, ensuring that each lower cable always maintains tension, so that the movement trajectory of the cable anchor fixing part is a controlled smooth deviation, avoiding the phenomenon that the stability of the tower is reduced due to the relaxation of one / multiple lower cables, and eliminating the safety hazard that the overall stability of the tower body is reduced due to the relaxation of the lower cable. The lower cable, the upper cable and the cable anchor fixing part introduced in the application form another stress system outside the tower body, the lower cable and the upper cable balance the stress of the cable anchor fixing part, balance the overall tension of the application, and balance the stress of the tower body, avoiding the influence of sway, effectively improving the overall stability and safety of the tower body, and the application saves material and cost.

[0016] The application can improve the space utilization rate of the lattice tower, and has simple and efficient overall structure, convenient post-operation and maintenance, good application prospect and economic benefit. In addition, the application is suitable for the lattice tower of the wind turbine, and is also suitable for other steel tower drums and steel-concrete tower drums of the wind turbine, improves the stress state of the tower body and enhances the stability and safety of the tower body without significantly increasing the self-weight of the tower body, provides a new choice for high-height and high-power wind turbines, and has good market application prospect and economic effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic diagram of the three-dimensional structure of the embodiment one of the application;

[0018] Figure 2 FIG. 2 is a schematic diagram of the three-dimensional structure of the cable anchor fixing part of the embodiment one of the application;

[0019] Figure 3 FIG. 3 is a schematic diagram of the structure of the application after application;

[0020] Figure 4 FIG. 4 is a schematic diagram of the working state of the application when the tower body is subjected to lateral displacement; Figure 3 FIG. 5 is an enlarged view of the local part N in FIG. 4;

[0021] Figure 5 FIG. 6 is a schematic diagram of the working state of the application when the tower body is subjected to lateral displacement to the left (part of the tower body structure and part of the lower cable are omitted in the figure).

[0022] Figure 6 A schematic diagram of the operation of this invention when it undergoes lateral displacement to the right (part of the tower body structure and part of the downstay cable are omitted in the figure);

[0023] The reference numerals in the accompanying drawings include: 1. Cable anchor fixing component, 2. Lower cable, 3. Upper cable, 4. Anchor hole A, 5. Anchor hole B, 6. Stabilizing groove, 7. Anchoring surface, 8. Tower body, 9. Adapter component, 10. Steel tower, 11. Wind turbine generator set. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0025] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show units relevant to the present invention and are not drawn according to the actual number, shape, and size of units in implementation. In actual implementation, the form, quantity, and proportion of each unit can be arbitrarily changed, and the unit layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0026] Example 1

[0027] like Figures 1-4 As shown, this embodiment provides a prestressed cable-stayed structure for wind power that is always under tension, including a cable anchor fixing component 1, multiple lower cables 2 and multiple upper cables 3. The upper ends of the lower cables 2 and the lower ends of the upper cables 3 are respectively connected to the cable anchor fixing component 1; the lower ends of the multiple lower cables 2 are anchored to the ground, and the cable anchor fixing component 1 is suspended in the hollow tower body through the multiple upper cables 3.

[0028] As Figure 3 and 4 The tower body in the embodiment is a lattice tower, which comprises a steel tower drum 10, a tower body 8 and a transition component 9, the upper end of the tower body 8 is provided with the transition component 9, the upper stay cable 3 and the stay cable anchor fixing component 1 are located inside the tower body 8, and the upper end of the upper stay cable 3 is connected with the transition component 9. In addition, the orientation of the application can be flexibly adjusted according to actual construction needs and terrain conditions.

[0029] After the application is installed, the lower end of the lower stay cable 2 is anchored to the ground, that is, in addition to the stress of the tower body 8 itself, the application adds a set of stress system, that is, the wind turbine has two sets of stress systems, namely the prestressed stay cable structure for wind power and the tower body 8, so that the mechanism (such as a wind turbine) installed on the steel tower drum 10 has two sets of stress systems when subjected to wind or other dynamic loads, and the overall structure has good long-term stability.

[0030] After the application is applied, the lower end of the lower stay cable 2 is anchored to the ground, and the anchoring mode can adopt existing technologies, such as a prestressed anchoring structure, a steel anchor beam, a steel anchor box, etc. The lower stay cable 2 and the upper stay cable 3 balance the stress of the stay cable anchor fixing component 1, balance the overall tension of the application, promote the stress balance of the lattice tower, avoid the influence of shaking, and effectively enhance the stability and safety of the overall lattice tower. As Figure 5 and 6As shown, taking the number of the lower cable 2 and the upper cable 3 as three as an example, after practical application of the application, the cable anchor fixing component 1 is suspended in the hollow tower body 8 through a plurality of the upper cable 3, the lower cable 2 is pre-tensioned to form prestress, when the tower body is subjected to lateral external force (such as wind force) or seismic load, the tower body will tilt or sway in a certain direction, because the rigidity of the upper cable 3 is larger, the tilt angle is smaller, and the upper cable 3 mainly conducts vertical force, so the cable anchor fixing component 1 connected with the upper cable 3 will move in the direction of the tower body sway, because the displacement direction of the cable anchor fixing component 1 and the vertical projection angle of the lower cable 2 are different, at this time, two situations will appear, the first situation: when the displacement direction of the cable anchor fixing component 1 and the vertical projection angle of a certain lower cable 2 is less than a certain angle (determined by the number and arrangement of the lower cable 2, for example, in this embodiment, the number of the lower cable 2 is three and is distributed at equal intervals around the cable anchor fixing component, and the angle is about 60 degrees), because the displacement direction of the cable anchor fixing component 1 and the horizontal force direction of the lower cable 2 are small, the lower cable 2 will show a compression relaxation trend, at the same time, the other two lower cables 2 will bear greater tension. Because the displacement direction of the cable anchor fixing component 1 and the force direction of the remaining two lower cables 2 form a larger angle, the horizontal force of the remaining two lower cables 2 is opposite to the displacement direction of the cable anchor fixing component 1, in order to resist the displacement trend of the cable anchor fixing component 1, the tension of the two cables will significantly increase, they will tend to be tightened to generate greater tension to offset the mechanical weakening of the lower cable 2 with a relaxation trend and make it not relax. The second situation: when the displacement direction of the cable anchor fixing component 1 is located between the vertical projections of the two lower cables 2, that is, the vertical projection angles of the two lower cables 2 are both 60 degrees, at this time, the displacement direction of the cable anchor fixing component 1 and the horizontal force direction of the two lower cables 2 are both 60 degrees, the two lower cables 2 will show a compression relaxation trend, at the same time, the horizontal force direction of the third lower cable 2 is opposite to the displacement direction of the cable anchor fixing component 1, at this time, the tension of the third lower cable 2 increases, forming an active tensioning effect, and applying a centripetal tension to the cable anchor fixing component 1 through its tension to generate greater tension to offset the mechanical weakening of the lower cable 2 with a relaxation trend and make it not relax. In summary, the movement trajectory of the cable anchor fixing component 1 thus shows a controlled smooth deviation, when the force of a certain two lower cables 2 decreases, the tension of the other two / one lower cable 2 is redistributed through the cable anchor fixing component 1, which is a dynamic balance self-adapting process, ensuring that each lower cable 2 always remains in tension, avoiding the phenomenon that the stability of the tower is reduced due to the relaxation of a certain lower cable 2, and eliminating the safety hazard that the overall stability of the tower is reduced due to the relaxation of the lower cable 2.Meanwhile, the space utilization rate of the lattice tower can be improved, and the whole structure is simple and efficient, convenient for later operation and maintenance, and has good application prospect and economic benefits.

[0031] Further, the anchor fixing part 1 is provided with a plurality of anchor holes A4 and anchor holes B5, the upper end of the lower cable 2 extends into the anchor hole A4 and is anchored to the anchor fixing part 1, the lower end of the upper cable 3 extends into the anchor hole B5 and is anchored to the anchor fixing part 1, and the anchoring mode can adopt a prestressed anchoring structure, that is, the anchor hole B5 and the anchor hole A4 are both provided with a tooth block, the lower end of the upper cable 3 and the upper end of the lower cable 2 are anchored to the corresponding tooth blocks, so that the influence of the sway of the upper cable 3 and the lower cable 2 can be reduced.

[0032] Specifically, the anchor hole A4 corresponds to the lower cable 2 one by one, and the anchor hole B5 corresponds to the upper cable 3 one by one. The anchor hole A4 and the anchor hole B5 both have an inclination, the inclination of the anchor hole A4 is greater than the inclination of the anchor hole B5, the upper ends of the plurality of anchor holes A4 and the plurality of anchor holes B5 are more concentrated than the lower ends, that is, the upper ends of the plurality of anchor holes A4 are more concentrated than the lower ends, and the upper ends of the plurality of anchor holes B5 are also more concentrated than the lower ends; the axial direction of the lower cable 2 coincides with the axial direction of the anchor hole A4, and the axial direction of the upper cable 3 coincides with the axial direction of the anchor hole B5.

[0033] Preferably, the plurality of anchor holes A4 and the plurality of anchor holes B5 are arranged at equal intervals. In other words, the plurality of anchor holes A4 are arranged at equal intervals, and the plurality of anchor holes B5 are also arranged at equal intervals, so that the plurality of lower cables 2 are arranged at equal intervals, and the plurality of upper cables 3 are also arranged at equal intervals, that is, the included angle between two adjacent lower cables 2 is equal to the included angle between another two adjacent lower cables 2, and the included angle between two adjacent upper cables 3 is equal to the included angle between another two adjacent upper cables 3, that is, the two are arranged at equal angles.

[0034] Further, the plurality of anchor holes A4 and the plurality of anchor holes B5 are arranged at equal intervals. Specifically, the anchor hole B5 is arranged between two adjacent anchor holes A4, and the distance from the anchor hole B5 to the two adjacent anchor holes A4 is equal.

[0035] In the embodiment, the lower cable 2 and the upper cable 3 are both three, the three points of the lower cable 2 on the horizontal section are connected to form a regular triangle structure, and the three points of the upper cable 3 on the horizontal section are also connected to form a regular triangle structure. In addition, the number of the lower cable 2 and the upper cable 3 can be more than three.

[0036] Preferably, the top of the cable anchoring component 1 is provided with a stabilizing groove 6 for stabilizing the lower cable 2, and the stabilizing groove 6 corresponds to the anchoring hole A4, and specifically, the number of the stabilizing groove 6 is three; the stabilizing groove 6 has an anchoring surface 7, and the upper end of the anchoring hole A4 is located at the middle of the anchoring surface 7, and the "middle" here refers to the non-peripheral part of the anchoring surface 7. The anchoring surface 7 can provide more anchoring modes for the upper end of the lower cable 2, such as mechanical anchoring, chemical anchoring, expansion bolt anchoring, and adhesive anchoring.

[0037] Further, the anchoring surface 7 is inclined relative to the upper end surface of the cable anchoring component. Specifically, the inclination angle of the anchoring surface 7 is set according to the inclination angle of the anchoring hole A4 in the axial direction, and it can also be said that the inclination angle of the anchoring surface 7 can be adjusted according to the actual engineering needs, and the anchoring surface 7 can also be locally flattened during the anchoring of the lower cable 2 and the cable anchoring component 1, so as to optimize the cable stress, reduce the shear stress of the lower cable 2, and meet the inclination angle requirements of the lower cable 2 in actual engineering construction.

[0038] Optionally, the cable anchoring component 1 is provided with a cavity, and the cavity penetrates through the upper and lower ends of the cable anchoring component 1; the stabilizing groove 6 is located at the junction of the inner side wall and the top of the cable anchoring component 1, which can facilitate the anchoring operation of the workers, and at the same time, it can also reduce the weight of the cable anchoring component 1, save materials, and save costs.

[0039] In this embodiment, the cable anchoring component 1 is a generally annular structure. The diameter of the inner side wall of the upper end of the cable anchoring component 1 gradually increases from bottom to top, further reducing the weight of the cable anchoring component 1, and saving costs.

[0040] The present application is not only suitable for lattice tower of wind turbine, but also suitable for other steel tower of wind turbine and steel-concrete tower, which further improves the stress state of the tower body, enhances the stability and safety of the tower body, provides a new choice for high-height and high-power wind turbine, and has good market application prospect and economic effect.

[0041] Embodiment two

[0042] This embodiment provides a pre-stressed cable structure for wind power that is always tensioned, which includes all the contents of embodiment one, and specific reference is made to embodiment one, which will not be repeated here. The difference is that this embodiment is based on the basis of embodiment one, and some structures are added, specifically, a maintenance platform is arranged in the cavity to facilitate the anchoring and installation of the upper cable and the lower cable and subsequent maintenance.

[0043] Embodiment three

[0044] The embodiment provides a wind power pre-stressed cable structure which is always tensioned. The structure is the same as that of the embodiment one, and details are referred to the embodiment one, which will not be repeated here. The difference is that the embodiment takes the application of the present application to a steel tower drum as an example, that is, the tower body is a pure steel tower drum. At this time, a suspension part can be arranged in the steel tower drum. The suspension part can only fix the upper end of the upper cable. In addition, a through hole is arranged on the wall of the steel tower drum, and the through hole can allow the lower cable to penetrate.

[0045] Embodiment four

[0046] The embodiment provides a wind power pre-stressed cable structure which is always tensioned. The structure is the same as that of the embodiment one, and details are referred to the embodiment one, which will not be repeated here. The difference is that the embodiment takes the application of the present application to a steel tower drum as an example, that is, the tower body is a pure steel tower drum. At this time, a suspension part can be arranged in the steel tower drum. The suspension part can only fix the upper end of the upper cable. In addition, a through hole is arranged on the wall of the steel tower drum, and the through hole can allow the lower cable to penetrate.

[0047] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

Claims

1. A pre-stressed stay cable structure for wind power always tensioned, characterized in that, The cable anchor fixing part, a plurality of lower cables and a plurality of upper cables, the upper end of the lower cable and the lower end of the upper cable are connected with the cable anchor fixing part respectively; the lower cable is a cable, the lower end of the plurality of lower cables is anchored to the ground outside the tower body, and the cable anchor fixing part is suspended in the hollow tower body through the plurality of upper cables; A plurality of anchor holes A and a plurality of anchor holes B are arranged on the cable anchor fixing part, the upper end of the lower cable is anchored to the cable anchor fixing part after extending into the anchor hole A, and the lower end of the upper cable is anchored to the cable anchor fixing part after extending into the anchor hole B; The anchor hole A and the anchor hole B both have an inclination, and the upper end of the plurality of anchor holes A and the plurality of anchor holes B is more concentrated than the lower end.

2. The always-tensioned wind power pre-stressed cable structure according to claim 1, characterized in that, The plurality of anchor holes A and the plurality of anchor holes B are arranged at equal intervals.

3. The always-tensioned wind power pre-stressed cable structure according to claim 2, characterized in that, The plurality of anchor holes A and the plurality of anchor holes B are arranged at equal intervals.

4. The always-tensioned wind power pre-stressed cable structure of claim 1, wherein, The top of the cable anchor fixing part is provided with a stabilizing groove for stabilizing the lower cable, the stabilizing groove corresponds to the anchor hole A one by one; the stabilizing groove has an anchoring surface, and the upper end of the anchor hole A is located in the middle of the anchoring surface.

5. The always-tensioned wind power pre-stressed cable structure according to claim 4, characterized in that, The anchoring surface is inclined relative to the upper end surface of the cable anchor fixing part.

6. The always-tensioned wind power pre-stressed cable structure according to claim 4 or 5, characterized in that, The middle of the cable anchor fixing part is provided with a cavity, the cavity penetrates the upper and lower ends of the cable anchor fixing part; and the stabilizing groove is located at the junction of the inner side wall and the top wall of the cable anchor fixing part.

7. The always-tensioned wind power pre-stressed stayed cable structure according to claim 6, characterized in that, The cable anchor fixing part is a generally annular structure.

8. The always-tensioned wind power pre-stressed cable structure of claim 7, wherein, The diameter of the inner side wall of the upper end of the cable anchor fixing part gradually increases from bottom to top.

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