Prestressed anchoring structure of wind power tower without cavity foundation

Abstract

This utility model relates to wind turbine towers, specifically to a prestressed anchoring structure for a wind turbine tower's cavity-free foundation. An upward-extending cylindrical protrusion with its opening facing upwards is connected to the tower's base foundation. The protrusion is inserted into the lower end of a tubular tower lattice column. The lower end of a prestressed cable bundle extends from the top of the tower along the middle of the lattice column's tubular cavity to the cavity of the protrusion, and a lower anchor ring is connected to the lower end of the prestressed cable bundle. A limiting mechanism is installed within the cavity of the protrusion to restrict the upward displacement of the lower anchor ring. The tower's base foundation only requires the pouring of the upper foundation, eliminating the need for an operating chamber. The protrusion, as a prefabricated component, is fixed to the tower's base foundation during tower construction, forming an interlocking connection with the tower lattice column. The lower anchor ring, connected to the prestressed cable bundle, is lowered into the cavity of the protrusion and limited by the limiting mechanism, thus achieving the lower end anchoring of the prestressed cable bundle. This results in faster overall construction of the wind turbine tower and reduces the amount and cost of pouring the tower's base foundation.

Description

Technical Field

[0001] This utility model relates to wind turbine towers, specifically to a prestressed anchoring structure for a cavity-free foundation of a wind turbine tower. Background Technology

[0002] The lattice-type wind turbine tower is an innovative type of wind turbine tower. It adopts a "quadrilateral space truss structure" design, which significantly reduces the self-weight of the tower and the amount of steel used while meeting the installation requirements of the wind turbine. In existing technologies, in order to improve the bending resistance and load-bearing capacity of the entire tower, prestressed cable bundles composed of multiple steel strands need to be inserted into the lattice columns made of hollow steel tube concrete. At the same time, the upper and lower ends of the prestressed cable bundles are anchored at the top and bottom of the tower, respectively, and the prestressed cable bundles are tensioned and pre-tightened.

[0003] like Figure 1 As shown, the lattice-type wind turbine tower is prefabricated in sections and then assembled on the foundation 1. The foundation 1 has pre-drilled holes 2 for prestressed cable bundles 3 to pass through. The upper and lower ends of the prestressed cable bundles 3 are anchored to the top and foundation 1 respectively, thereby applying prestress to the tower body and improving its bending resistance. Typically, a crane is used to pull one end of the prestressed cable bundle 3 from the ground to the top of the tower for threading into the duct of the lattice column. The lower end of the prestressed cable bundle 3 passes through the pre-drilled hole 2 on the foundation 1, and a lower anchor 4 is installed below the pre-drilled hole 2 to anchor the prestressed cable bundle 3.

[0004] In the above technical solution, in order to carry out anchoring operations on the lower end of the prestressed cable bundle 3 at the bottom of the tower, it is necessary to construct an operating chamber 5 for technicians to enter below the tower foundation 1. This setup requires the tower foundation 1 to be poured twice on site, namely, the upper foundation and the lower operating chamber 5 are poured separately. The overall construction time of the tower foundation 1 is long, and it also increases the construction difficulty of the tower foundation 1, which is not conducive to the rapid construction of the tower body. On the other hand, the pouring of the operating chamber also requires a large construction cost. Summary of the Invention

[0005] This utility model provides a prestressed anchoring structure for a wind turbine tower without a cavity foundation. The prefabricated convex column is connected to the tower base foundation and lattice column on site, and the prestressed tendons are anchored. There is no need to build an operating chamber for personnel to enter inside the tower base foundation, which facilitates the rapid construction of the tower body and saves the construction cost of the operating chamber.

[0006] To achieve the above objectives, the technical solution adopted is as follows: a prestressed anchoring structure for a wind turbine tower without a cavity foundation, wherein a cylindrical protruding column extending upward and with its opening facing upward is connected to the base of the tower, the protruding column is inserted into the lower end of the tubular tower lattice column, the lower end of the prestressed cable bundle extends from the top of the tower to the cylindrical cavity of the protruding column along the middle cavity of the tower lattice column, and a lower anchor ring is connected to the lower end of the prestressed cable bundle, and a limiting mechanism is provided in the cylindrical cavity of the protruding column to restrict the upward displacement of the lower anchor ring.

[0007] Compared with the prior art, the technical effects of this utility model are as follows: only the upper foundation needs to be poured for the tower base, eliminating the need for an operating chamber. The protruding column, as a prefabricated component, is fixed to the tower base during tower construction. It forms an interlocking fit with the tower lattice column. The lower anchor ring connected to the prestressed cable bundle is lowered into the cavity of the protruding column and limited by a limiting mechanism, thereby realizing the lower end anchoring operation of the prestressed cable bundle. The overall construction speed of the wind turbine tower is fast, while also reducing the amount of pouring work and pouring cost of the tower base foundation, and significantly shortening the construction period. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the foundation of a lattice tower in the prior art;

[0009] Figure 2 This is a schematic diagram of the basic structure of the tower base and tower body in this utility model;

[0010] Figure 3 A schematic diagram of the lower end anchorage structure of the tower's lattice column;

[0011] Figure 4 for Figure 3 A partial structural diagram;

[0012] Figure 5 This is a schematic diagram of a convex prism.

[0013] Figure 6 A schematic diagram of the lower end of the lattice column of the tower;

[0014] Figure 7 This is a schematic diagram of the anchoring of the lower anchor ring and the prestressed cable;

[0015] Figure 8 This is a top view of the limiting pad and the limiting guide groove;

[0016] Figure 9 This is a schematic diagram showing the state of the arc-shaped C-shaped limiting pad when it is in the separated position;

[0017] Figure 10 This is a schematic diagram showing the state of the arc-shaped C-shaped limiting pad when it is in the blocking position;

[0018] Figure 11A schematic diagram showing the state of the C-shaped limiting pad, which is semi-circular in shape, when it is in the separated position;

[0019] Figure 12 A schematic diagram showing the state of the C-shaped limiting pad, which is semi-circular in shape, when it is in the blocking position;

[0020] Figure 13 A schematic diagram showing the state of the three arc-shaped C-shaped limiting pads when they are in the separated position;

[0021] Figure 14 This is a schematic diagram showing the state of the three arc-shaped C-shaped limit pads when they are in the blocking position. Detailed Implementation

[0022] The following is in conjunction with the appendix Figures 1-14 The present invention will be further described in detail below, including related content:

[0023] A prestressed anchoring structure for a wind turbine tower without a cavity foundation is provided. A cylindrical protruding column 20 extending upward with its opening facing upward is connected to the tower base foundation 10. The protruding column 20 is inserted into the lower end opening of a tubular tower lattice column 30. The lower end of the prestressed cable bundle A extends from the top of the tower along the middle cavity of the tower lattice column 30 to the cavity 21 of the protruding column 20, and the lower end of the prestressed cable bundle A is connected to a lower anchor ring 40. A limiting mechanism 50 is provided in the cavity 21 of the protruding column 20 to restrict the upward displacement of the lower anchor ring 40.

[0024] In the above technical solution, the operating chamber of the tower foundation 10 in the prior art is eliminated. The protruding column 20, as a prefabricated component, is fixed to the tower foundation 10 during tower construction. After the protruding column 20 and the tower lattice column 30 form an interlocking fit, the lower anchor ring 40, connected to the prestressed cable bundle A, is lowered from the top of the tower into the cavity of the protruding column 20 along the tube of the tower lattice column 30. The lower anchor ring 40 is limited by the limiting mechanism 50, restricting its upward displacement. This allows for the tensioning and pre-tightening of the prestressed cable bundle A at the top of the tower, and the upper end of the prestressed cable bundle A is anchored using the upper anchor, thus achieving the overall anchoring of the prestressed cable bundle A. With this solution, the overall construction speed of the wind turbine tower is fast. Furthermore, by eliminating the operating chamber, the amount of pouring work and the cost of the tower foundation are greatly reduced, and the construction period is significantly shortened.

[0025] It should be noted that the convex column 20 is still a columnar structure as a whole, which can be formed by concrete casting. However, a cavity is opened on its upper end to form a cylindrical cavity 21.

[0026] As a preferred embodiment, a first anchor bolt 60a and a second anchor bolt 60b are pre-embedded within the tower foundation 10. The first anchor bolt 60a and the second anchor bolt 60b are arranged vertically as a whole. The upper end of the first anchor bolt 60a is connected to the protruding column 20, and the upper end of the second anchor bolt 60b is connected to the connecting plate 31 that protrudes radially outward from the lower end of the tower lattice column 30. In this embodiment, the first anchor bolt 60a is used to connect the protruding column 20 to fix it onto the tower foundation 10, and the second anchor bolt 60b is used to connect the tower lattice column 30 to fix it to the tower foundation 10.

[0027] It should be noted that the first anchor bolt 60a and the second anchor bolt 60b are not just one; multiple anchor bolts can be pre-embedded at circumferential intervals.

[0028] Furthermore, such as Figure 4 and Figure 5 As shown, the upper end of the first anchor bolt 60a penetrates the column of the protruding column 20 along the column core direction and extends to the top surface of the protruding column 20. A limiting nut 61 is provided at the upper end of the first anchor bolt 60a, and the limiting nut 61 abuts against the top surface of the protruding column 20 to form a limiting fit that restricts the upward displacement of the protruding column 20. In this scheme, a through hole is reserved inside the protruding column 20 for the first anchor bolt 60a to pass through. The limiting nut 61 abuts against the top surface of the protruding column 20 and locks it, thereby realizing the connection and fixation between the protruding column 20 and the tower base foundation 10.

[0029] Furthermore, such as Figure 3 As shown, the lower end of the first anchor bolt 60a extends downward within the tower foundation 10, and this end is connected to a first limiting plate 62a. The surface of the first limiting plate 62a is arranged at an angle to the first anchor bolt 60a. In this design, the first limiting plate 62a and the first anchor bolt 60a are integrated. In the bolt length direction of the first anchor bolt 60a, the first limiting plate 62a can provide a limiting surface that blocks the concrete structure of the tower foundation 10, preventing the first anchor bolt 60a from separating from or coming out of the tower foundation 10 along its bolt length direction, and strengthening the connection of the first anchor bolt 60a within the tower foundation 10.

[0030] Combination Figures 3-5 as well as Figure 8 As shown, the limiting mechanism 50 includes two limiting pads 51. The cylindrical wall of the cylindrical cavity 21 is provided with two limiting guide grooves 22 with opposite groove openings and the groove depth direction is arranged along the radial direction of the protrusion 20. The two limiting pads 51 are placed in the two limiting guide grooves 22 respectively, and a limiting guide fit is provided between the limiting pads 51 and the limiting guide grooves 22 to limit the translation of the limiting pads 51 along the groove depth direction. The limiting pads 51 are in the blocking position that abuts against the upper end face of the lower anchor ring 40 and restricts the upward displacement of the lower anchor ring 40, or in the separation position that avoids the upper and lower displacement paths of the lower anchor ring 40.

[0031] In this scheme, when the lower anchor ring 40 connected to the prestressed cable bundle A is lowered along the middle cavity of the tower lattice column 30 to the designated position in the cylindrical cavity 21 of the protruding column 20, that is, when the height of the upper end face of the lower anchor ring 40 is lower than the height of the lower end face of the limiting pad 51, under the limiting and guiding action of the limiting guide groove 22, the limiting pad 51 is controlled to move horizontally into the cylindrical cavity 21 along the groove depth direction of the limiting guide groove 22 (i.e., the radial direction of the protruding column 20) until the limiting pad 51 is on the vertical displacement path of the lower anchor ring 40. At this time, when the prestressed cable bundle A is tensioned upward at the top of the tower, the lower anchor ring 40 cannot move upward due to the obstruction of the limiting pad 51, thereby achieving the positioning of the lower anchor ring 40 so that the prestressed cable bundle A can be tensioned normally. Conversely, when the prestressed cable bundle A needs to be replaced later, the limiting pad 51 is controlled to move horizontally into the limiting guide groove 22 until the limiting pad 51 is in a separated position that avoids the upper and lower displacement paths of the lower anchor ring 40. That is, the limiting pad 51 will not block the upper and lower displacement of the lower anchor ring 40. By lifting the prestressed cable bundle A, the lower anchor ring 40 can be pulled out from the cylinder cavity 21 and taken out from the top pipe opening of the tower lattice column 30.

[0032] It should be noted that, as Figure 8 As shown, the limiting guide fit between the limiting pad 51 and the limiting guide groove 22 can be limited by the groove wall of the limiting guide groove 22 itself, or by setting a guide rail and a slider (the guide rail and slider are not shown in the figure) that cooperate with each other and are arranged in the radial direction of the protrusion 20 on the limiting pad 51 and the limiting guide groove 22, so that the limiting pad 51 can only move along the groove depth direction of the limiting guide groove 22.

[0033] Furthermore, the limiting mechanism 50 also includes a control rod 52. The length direction of the control rod 52 is consistent with the displacement direction of the pad 51. The tower lattice column 30 and the protruding column 20 are provided with reserved channels P for the control rod 52 to pass through. The reserved channels P penetrate the bottom surface of the limiting guide groove 22. The limiting pad 51 is provided with a threaded hole on the side near the bottom surface of the limiting guide groove 22. The inner rod end of the control rod 52 and the threaded hole on the corresponding limiting pad 51 form a threaded connection, and the outer rod end extends to the outside of the tower lattice column 30.

[0034] In this scheme, a control rod 52 is used to control the translation of the limiting pad 51 along the depth direction of the limiting guide groove 22. Specifically, when constructing the tower body, the tower body lattice column 30 is connected to the protruding column 20. The first anchor ring 60a and the second anchor bolt 60b are used for accurate positioning. The reserved hole P on the tower body lattice column 30 is naturally aligned with the reserved hole P on the protruding column 20. After the lower anchor ring 40 is lowered along the middle cavity of the tower body lattice column 30 to the designated position in the cylindrical cavity 21 of the protruding column 20, a control rod 52 is inserted into the reserved hole P from the outside of the tower body lattice column 30 and pushed inward until the control rod 52 abuts against the limiting pad 51. Then, the control rod 52 is rotated so that the inner end of the control rod 52 is screwed into the threaded hole on the limiting pad 51, thus realizing the connection between the two. At this time, by pushing and pulling the control rod 52, the limiting pad 51 can be controlled to move horizontally along the groove depth direction of the limiting guide groove 22 to block the lower anchor ring 40 or avoid the lower anchor ring 40.

[0035] It should be noted that the limiting pad 51 is a steel structural component, which is relatively heavy and has a large frictional force with the groove wall of the limiting guide groove 22. Therefore, during the process of the control rod 52 abutting against the limiting pad 51 and being screwed into the threaded hole, the screwing operation of the control rod 52 will not force the limiting pad 51 to move, thus allowing the inner end of the control rod 52 to be screwed into the threaded hole normally. In addition, since a limiting guide fit is provided between the limiting pad 51 and the limiting guide groove 52 to limit the translation of the limiting pad 51 along the groove depth direction, the limiting pad 51 will not deflect circumferentially or rotate within the limiting guide groove 52. The circumferential position of the limiting pad 51 within the limiting guide groove 22 is fixed. As long as the threaded hole is aligned with the reserved channel P, the control rod 52 can naturally mate with the threaded hole.

[0036] Furthermore, the limiting pad 51 and each groove wall of the limiting guide groove 22 form an abutting sliding fit. On the one hand, this is to effectively limit the circumferential and vertical position of the limiting pad 51 in the limiting guide groove 22. On the other hand, it is also to increase the friction contact surface between the limiting pad 51 and the limiting guide groove 22, so as to prevent the limiting pad 51 from sliding easily and to further ensure the smooth docking of the control rod 52 with the threaded hole.

[0037] As a preferred embodiment, the two limiting pads 51 are C-shaped and arranged with their openings facing each other. When one limiting pad 51 moves along the depth direction of the limiting guide groove 22 towards the other limiting pad 51 until the ends of the two limiting pads 51 are joined together, a portion of each limiting pad 51 is located within the corresponding cavity of the limiting guide groove 22. To prevent the limiting pad 51 from slipping into the cavity 21 due to unforeseen circumstances before the lower anchor ring 40 is lowered into the cylinder cavity 21 and becoming unrecoverable by the control rod 52, this embodiment ensures that even if one limiting pad 51 naturally slides along the depth direction of the limiting guide groove 22 towards the other, the limiting pad 51 will not fall to the bottom of the cylinder cavity 21, but will instead slide until the ends of the two limiting pads 51 are joined together. Each pad 51 has a portion of its block located within the corresponding limiting guide groove 22. This means that the limiting pad 51 is not completely detached from the corresponding limiting guide groove 22 and is still constrained by the limiting guide groove 22. When the control rod 52 is inserted later, the control rod 52 can also connect normally to the threaded hole on the limiting pad 51, thereby using the control rod 52 to pull the limiting pad 51 back into the limiting guide groove 22, so as to prevent the limiting pad 51 from being exposed into the cylinder cavity 21 and thus hindering the downward movement of the lower anchor ring 40.

[0038] It should be noted that when the C-shaped limiting pad 51 is C-shaped and the two limiting guide grooves 22 are independent of each other, the radial dimension of the protruding post 20 should be made larger, while the diameter of the cylindrical cavity 21 should be made as small as possible while ensuring that the lower anchor ring 40 can enter the ground. This allows for an increase in the depth of the limiting guide groove 22, ensuring that even when the two limiting pads 51 abut each other from the separation position to the blocking position, they do not completely detach from the limiting guide groove 22, meeting the length requirements. Of course, combined with... Figure 8 As shown, the limiting pad 51 is in the shape of a strip, which can ensure that it will not completely detach from the limiting guide groove 22, and at the same time, it can be completely retracted into the limiting guide groove 22.

[0039] Furthermore, as a preferred option, combined with Figure 9 and Figure 10 As shown, the two limiting guide grooves 22 pass through the circumferential direction of the protrusion 20 to form an annular groove. The annular groove is arranged coaxially with the cylindrical cavity 21. When the limiting pad 51 is in the separated position where it avoids the upper and lower displacement paths of the lower anchor ring 40, the two limiting pads 51 are located in the cavity of the annular groove and there is a gap between their opposite ends.

[0040] Figure 9 The diagram shows the limiting pad 51 in the separated position. Figure 10 The diagram shows the limiting pad 51 in the blocking position.

[0041] In this design, the limiting guide groove 22 is an annular groove, and its depth does not need to be too deep. The C-shaped limiting pad 51 is located inside the cavity of the annular groove. When the C-shaped limiting pad 51 moves radially along the protrusion 20, its overall displacement reaches a position where its end abuts against the end of another C-shaped limiting pad 51, and the C-shaped limiting pad 51 will not completely detach from the limiting guide groove 22. This allows for adjustable space in setting the dimensions of the protrusion 20.

[0042] Furthermore, such as Figure 11 and Figure 12 As shown, the limiting pad 51 is generally in the shape of a semi-circular ring. When the two limiting pads 51 are in the blocking position, their ends abut against each other to form a complete ring, and this ring structure is arranged concentrically with the cylinder cavity 21. This allows the formed complete ring to provide a larger bearing surface for the lower anchor ring 40. After the prestressed cable bundle A is tensioned and pre-tightened, the lower anchor ring 40 is subjected to consistent force at all circumferential positions, ensuring its stability.

[0043] Of course, in addition to setting two symmetrically arranged limiting blocks 51, at least three limiting blocks 51 can also be equally spaced in the circumferential direction of the protrusion 20. When each limiting block 51 is in the blocking position, the ends of each limiting block 51 abut against each other to form a complete circular structure, and this circular structure is arranged concentrically with the cylindrical cavity 21. Figure 13 and Figure 14 As shown, a limiting mechanism 50 that blocks the lower anchor ring 30 is formed by multiple limiting pads 51. Compared with only two C-shaped limiting pads 51, this solution, by setting multiple C-shaped limiting pads 51, does not require the groove depth of the limiting guide groove 22 to be too deep, and the size design of the protrusion 20 is more reasonable, which can meet the requirement that the limiting guide groove 22 can completely accommodate the limiting pads 51.

[0044] Here, combined Figure 9 , Figure 11 as well as Figure 13 As indicated by the arrow, it is further explained that the translational movement of the C-shaped limiting pad 51 in the radial direction can be limited by the guide rail and slider arranged in the radial direction along the protrusion 20 (the direction of the arrow is the setting direction of the guide rail). The guide rail or slider can be attached to the upper or lower groove wall of the limiting guide groove 22, or it can be attached to the limiting pad 51.

[0045] Combination Figure 3 , Figure 4 as well as Figure 7As shown, the lower end of the steel strand A1 constituting the prestressed cable bundle A passes through the cable-passing hole 41 on the lower anchor ring 40 and is clamped and fixed by the clamp 42 set in the cable-passing hole 41. A baffle 43 is attached to the lower end surface of the lower anchor ring 40. The surface of the baffle 43 abuts against the lower end of the clamp 42 and restricts the clamp 42 from disengaging downward from the cable-passing hole 41. The baffle 43 is provided with a hole for the steel strand A1 to pass through. In this scheme, the prestressed cable bundle A is pre-connected to the lower anchor ring 40 before being lowered into the cavity 21 of the protruding column 20. During the lowering process, the steel strands A1 constituting the prestressed cable bundle A have not yet been tensioned. Therefore, in order to prevent the clamping plate 42 from loosening during the lowering of the lower anchor ring 40, which would cause the steel strand A1 to detach from the cable-passing hole 41 on the lower anchor ring 40 and cause the lower anchor ring 40 to fall, the baffle plate 43 is used to hold the outer end of the clamping plate 42, thereby preventing the clamping plate 42 from falling out of the cable-passing hole 41, so that the clamping plate 42 provides stable clamping constraint on the steel strand A1, ensuring a stable connection between the steel strand A1 and the lower anchor ring 40.

[0046] As a preferred embodiment, the upper column portion of the protruding post 20 is composed of an annular anchor plate 70, which is coaxially arranged with the protruding post 20. The first anchor bolt 60a penetrates the anchor plate 70, and the limiting nut 61 abuts against the upper end face of the anchor plate 70. The anchor plate 70, made of alloy material, provides reliable rigid support for the pre-tightening of the first anchor bolt 60a. Simultaneously, the top wall of the limiting guide groove 22 can also be directly formed from the lower end face of the anchor plate 70. This allows the limiting pad 51 to be placed into the limiting guide groove 22 before the anchor plate 70 is placed on top, facilitating the installation of the limiting pad 51 into the limiting guide groove 22.

[0047] Combination Figure 4 As shown, the lower end of the protruding column 20 is connected to the base plate 23, and the upper end of the second anchor bolt 60b penetrates the base plate 23 and the connecting plate 31, and the second anchor bolt 60b is fixedly connected to the connecting plate 31. When the second anchor bolt 60b connects to the connecting plate 31 on the tower lattice column 30, it also connects the base plate 23 on the protruding column 20 together, realizing the common connection between the tower base 10, the protruding column 20 and the tower lattice column 30, and strengthening the connection between them.

[0048] Furthermore, such as Figure 3 As shown, the lower end of the second anchor bolt 60b is connected to a second limiting plate 62b, and the surface of the second limiting plate 62b is arranged at an angle to the second anchor bolt 60b. Similar to the purpose of the first limiting plate 62a, the second limiting plate 62b is designed to strengthen the connection between the second anchor bolt 60b and the tower foundation 10.

[0049] Combination Figures 4-6As shown, the lower end of the tower lattice column 30 has a stepped hole with a larger outer diameter and a smaller inner diameter. The protruding column 20 is located within the larger diameter section of the stepped hole. The opening of the cylindrical cavity 21 is directly opposite the opening of the smaller diameter section of the stepped hole, and the size of the cylindrical opening is greater than or equal to the size of the opening of the smaller diameter section of the stepped hole. When the cylindrical wall of the protruding column 20 is relatively thick, the larger diameter section of the stepped hole is used to ensure that the cylindrical wall of the protruding column 20 is aligned with the opening of the smaller diameter section, and the size of the cylindrical opening is greater than or equal to the size of the opening of the smaller diameter section of the stepped hole. This prevents the lower anchor ring 40 from being blocked by the top end face of the protruding column 20 and unable to fall when it is lowered.

[0050] Of course, it is also possible for the cylindrical wall of the protruding post 20 to be relatively thin, but the limiting guide groove 22 needs to be formed by protruding radially outward from the cylindrical wall. Alternatively, the opening of the cylindrical cavity 21 can be set into a conical flared shape to guide the lower anchor ring 40 into the cylindrical cavity 21.

[0051] Furthermore, a downwardly protruding guide tube 32 is coaxially arranged at the edge of the small-diameter section of the stepped hole. The inner wall of the guide tube 32 is flush with and extends smoothly with the inner wall of the small-diameter section, and the inner diameter of the guide tube 32 is less than or equal to the inner diameter of the cylindrical cavity 21. The function of the guide tube 32 is to assist in guiding the lower anchor ring 40 into the cylindrical cavity 21 of the protruding post 20.

[0052] Finally, it should be noted that the solution proposed in this application is not limited to the prestressed anchorage system of lattice towers, but can also be applied to other similar prestressed anchorage systems.

Claims

1. A prestressed anchoring structure for a cavity-free foundation of a wind turbine tower, characterized in that: A cylindrical protruding column (20) extending upwards and with its opening facing upwards is connected to the foundation (10) at the bottom of the tower. The protruding column (20) is inserted into the lower end of the tubular tower lattice column (30). The lower end of the prestressed cable bundle (A) extends from the top of the tower to the cylindrical cavity (21) of the protruding column (20) along the middle cavity of the tower lattice column (30). The lower end of the prestressed cable bundle (A) is connected to a lower anchor ring (40). A limiting mechanism (50) restricting the upward displacement of the lower anchor ring (40) is provided in the cylindrical cavity (21) of the protruding column (20).

2. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 1, characterized in that: The first anchor bolt (60a) and the second anchor bolt (60b) are pre-embedded in the foundation (10) of the tower. The first anchor bolt (60a) and the second anchor bolt (60b) are arranged vertically as a whole. The upper end of the first anchor bolt (60a) is connected to the protruding column (20), and the upper end of the second anchor bolt (60b) is connected to the connecting plate (31) that protrudes radially outward from the lower end of the tower lattice column (30).

3. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 2, characterized in that: The upper end of the first anchor bolt (60a) passes through the column body of the protruding post (20) along the core direction of the protruding post (20) and extends to the top surface of the protruding post (20). A limiting nut (61) is provided at the upper end of the first anchor bolt (60a), and the limiting nut (61) abuts against the top surface of the protruding post (20) to form a limiting fit that restricts the upward displacement of the protruding post (20).

4. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 3, characterized in that: The lower end of the first anchor bolt (60a) extends downward within the tower base (10) and is connected to the first limiting plate (62a). The surface of the first limiting plate (62a) is arranged at an angle to the first anchor bolt (60a).

5. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 1, characterized in that: The limiting mechanism (50) includes two limiting pads (51). The cylindrical wall of the cylinder cavity (21) is provided with two limiting guide grooves (22) with opposite groove openings and groove depth direction arranged in the radial direction of the protrusion (20). The two limiting pads (51) are placed in the two limiting guide grooves (22) respectively, and a limiting guide fit is provided between the limiting pads (51) and the limiting guide grooves (22) to limit the translation of the limiting pads (51) in the groove depth direction. The limiting pads (51) are in the blocking position that abuts against the upper end face of the lower anchor ring (40) and restricts the upward displacement of the lower anchor ring (40) or in the separation position that avoids the upper and lower displacement paths of the lower anchor ring (40).

6. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 5, characterized in that: The limiting mechanism (50) also includes a control rod (52). The length direction of the control rod (52) is consistent with the displacement direction of the pad (51). The tower lattice column (30) and the protruding column (20) are provided with reserved channels (P) for the control rod to pass through. The reserved channels (P) penetrate the bottom surface of the limiting guide groove (22). The limiting pad (51) is provided with a threaded hole on one side near the bottom surface of the limiting guide groove (22). The inner rod end of the control rod (52) and the threaded hole on the corresponding limiting pad (51) form a threaded connection, and the outer rod end extends to the outside of the tower lattice column (30).

7. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 6, characterized in that: The limiting pad (51) and the walls of the limiting guide groove (22) form a sliding contact.

8. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 5, 6, or 7, characterized in that: The two limiting pads (51) are C-shaped and their openings are arranged opposite each other. When one of the limiting pads (51) moves along the groove depth direction of the limiting guide groove (22) to the other limiting pad (51) until the ends of the two limiting pads (51) are connected to each other, a portion of the two limiting pads (51) is located in the groove cavity of their respective limiting guide groove (22).

9. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 8, characterized in that: Two limiting guide grooves (22) are connected in the circumferential direction of the protruding column (20) to form an annular groove. The annular groove is arranged with the cylinder cavity (21) in the same core. When the limiting pad (51) is in the separation position where it avoids the upper and lower displacement paths of the lower anchor ring (40), the two limiting pads (51) are located in the groove cavity of the annular groove and there is a gap between the opposite ends.

10. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 9, characterized in that: The limiting pad (51) is in the shape of a semi-circular ring. When the two limiting pads (51) are in the blocking position, the ends of the two limiting pads (51) abut against each other to form a complete ring structure, and the ring structure is arranged with the same core as the cylinder (21).

11. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 9, characterized in that: At least three limiting pads (51) are equally spaced in the circumferential direction of the protrusion (20). When each limiting pad (51) is in the blocking position, the ends of each limiting pad (51) abut against each other to form a complete circular structure, and the circular structure is arranged co-core with the cylinder cavity (21).

12. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 1, characterized in that: The lower end of the steel strand (A1) constituting the prestressed cable bundle (A) passes through the cable-passing hole (41) on the lower anchor ring (40) and is clamped and fixed by the clamp (42) set in the cable-passing hole (41). A baffle (43) is attached to the lower end surface of the lower anchor ring (40). The baffle (43) abuts against the lower end of the clamp (42) and restricts the clamp (42) from falling out of the cable-passing hole (41). The baffle (43) is provided with a hole for the steel strand (A1) to pass through.

13. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 3 or 5, characterized in that: The upper column part of the protruding column (20) is composed of an annular anchor plate (70). The anchor plate (70) and the protruding column (20) are arranged coaxially. The first anchor bolt (60a) passes through the anchor plate (70) and the limiting nut (61) abuts against the upper surface of the anchor plate (70).

14. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 2, characterized in that: The lower end of the protruding post (20) is connected to the base plate (23), and the upper end of the second anchor bolt (60b) passes through the base plate (23) and the connecting plate (31), and the second anchor bolt (60b) is connected and fixed to the connecting plate (31).

15. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 2 or 14, characterized in that: The lower end of the second anchor bolt (60b) is connected to a second limiting plate (62b), and the surface of the second limiting plate (62b) is arranged at an angle to the second anchor bolt (60b).

16. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 1, characterized in that: The lower end of the lattice column (30) of the tower body is a stepped hole with a large outer diameter and a small inner diameter. The protruding column (20) is located in the large diameter section of the stepped hole. The cylinder opening (21) is arranged opposite to the opening of the small diameter section of the stepped hole, and the cylinder opening size is greater than or equal to the opening size of the small diameter section of the stepped hole.

17. The prestressed anchoring structure for a cavity-free foundation of a wind turbine tower according to claim 16, characterized in that: At the edge of the small-diameter section of the stepped hole, a downwardly protruding guide tube (32) is arranged co-core. The inner wall of the guide tube (32) is flush with and extends along the inner wall of the small-diameter section. The inner diameter of the guide tube (32) is less than or equal to the inner diameter of the cylindrical cavity (21).

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