Prestressed anchoring structure for cavity-free foundation of wind power tower

Abstract

The invention relates to a wind power tower, in particular to a wind power tower cavity-free foundation prestress anchoring structure which is characterized in that a tower bottom foundation is connected with a barrel-shaped convex column which extends upwards and is provided with an upward barrel opening, and the convex column is inserted into a lower end pipe opening of a tubular tower body latticed column; the lower end of the prestressed cable bundle extends into a barrel cavity of the convex column from the tower top along a middle pipe cavity of the tower body latticed column, the lower end of the prestressed cable bundle is connected with a lower anchor ring, and a limiting mechanism for limiting upward displacement of the lower anchor ring is arranged in the barrel cavity of the convex column. Only an upper-layer foundation needs to be poured on the tower bottom foundation, arrangement of an operation cavity is omitted, the convex columns serve as prefabricated parts, when the tower body is built, the convex columns are fixedly arranged on the tower bottom foundation and are in insertion fit with the tower body latticed columns, and the lower anchor rings connected with the prestressed cable bundles are put down into cylindrical cavities of the convex columns and are limited through the limiting mechanisms. And the overall construction speed of the wind power tower is high, and meanwhile, the pouring work amount and the pouring cost of the tower bottom foundation are reduced.

Description

Technical Field

[0001] The invention relates to a wind power tower, in particular to a prestressed anchoring structure of a wind power tower without a cavity foundation. Background Art

[0002] The lattice wind turbine tower is an innovative wind turbine tower that utilizes a "quadrilateral space truss" design. While meeting wind turbine installation requirements, it significantly reduces tower weight and steel usage. To improve the bending resistance and load-bearing capacity of the entire tower, existing technologies require prestressed cables consisting of multiple steel strands to be threaded through the hollow concrete-filled steel tubular lattice columns. These cables are then anchored at the top and bottom of the tower, and tensioned.

[0003] like Figure 1 As shown, the tower body of a lattice-type wind turbine tower is prefabricated in sections and assembled above the tower base 1. The tower base 1 is provided with a reserved hole 2 for the prestressed cable bundle 3 to pass through. The upper and lower ends of the prestressed cable bundle 3 are anchored to the tower top and the tower base 1, respectively, thereby applying prestress to the tower body and improving its bending resistance. Typically, a lifting machine is required to pull one end of the prestressed cable bundle 3 from the ground to the tower top to thread it into the lumen of the lattice column. The lower end of the prestressed cable bundle 3 passes through the reserved hole 2 on the tower base 1, and a lower anchor 4 is installed below the reserved hole 2 to anchor the prestressed cable bundle 3.

[0004] In the above technical solution, in order to be able to carry out anchoring operations on the lower ends of the prestressed cable bundles 3 at the bottom of the tower, it is necessary to build an operating chamber 5 for technical personnel to enter under the tower bottom foundation 1. This setting requires the tower bottom foundation 1 to be cast on-site twice, that is, the upper foundation and the lower operating chamber 5 are cast separately. The overall construction time of the tower bottom foundation 1 is long, and the construction difficulty of the tower bottom foundation 1 is increased, which is not conducive to the rapid construction of the tower body. On the other hand, the casting of the operating chamber also requires a large construction cost. Summary of the Invention

[0005] The present invention provides a prestressed anchoring structure for a wind turbine tower without a cavity foundation. Prefabricated convex columns are connected to the tower base and lattice columns on-site, and the anchoring operation of the prestressed beams is implemented. There is no need to build an operating chamber for personnel to enter in the tower base, which facilitates the rapid construction of the tower body and saves the construction cost of the operating chamber.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted is: a prestressed anchoring structure of a wind tower without a cavity foundation, wherein a cylindrical convex column extending upward with the tube mouth facing upward is connected to the tower bottom foundation, and the convex column is inserted into the lower end tube mouth of the tubular tower lattice column. The lower end of the prestressed cable bundle extends from the tower top along the middle tube cavity of the tower lattice column to the tube cavity of the convex column, and the lower end of the prestressed bundle is connected to a lower anchor ring, and a limiting mechanism is provided in the tube cavity of the convex column to limit the upward displacement of the lower anchor ring.

[0007] Compared with the prior art, the technical effects of the present invention are as follows: the tower bottom foundation only needs to cast the upper foundation, and the setting of the operating chamber is cancelled. The convex column is a prefabricated part. When building the tower body, it is fixed on the tower bottom foundation. It is plug-in matched with the tower body lattice column. The lower anchor ring connected to the prestressed cable bundle is lowered into the convex column cavity and limited by the limiting mechanism. The lower end anchoring operation of the prestressed cable bundle can be realized. The overall construction speed of the wind turbine tower is fast, and the pouring work volume and pouring cost of the tower bottom foundation are also reduced, and the construction period is significantly shortened. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0009] Figure 2 It is a schematic diagram of the basic structure of the tower bottom foundation and the tower body in the present invention;

[0010] Figure 3 Schematic diagram of the lower end anchoring structure of the tower lattice column;

[0011] Figure 4 for Figure 3 Schematic diagram of some structures in ;

[0012] Figure 5 is a schematic diagram of a convex column;

[0013] Figure 6 This is a schematic diagram of the pipe opening at the lower end of the tower lattice column;

[0014] Figure 7 Schematic diagram of the anchoring of the lower anchor ring and prestressed cable;

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

[0016] Figure 9 It is a schematic diagram of the state when the arc-shaped C-shaped limit pad is in the separated position;

[0017] Figure 10 It is a schematic diagram of the state when the arc-shaped C-shaped limit pad is in the blocking position;

[0018] Figure 11 It is a schematic diagram of the semicircular C-shaped limiting pad in the separated position;

[0019] Figure 12 This is a schematic diagram of the semicircular C-shaped limiting pad in the blocking position;

[0020] Figure 13 It is a schematic diagram of the state when three arc-shaped C-shaped limit pads are in the separated position;

[0021] Figure 14 It is a schematic diagram of the state when three arc-shaped C-shaped limit pads are in the blocking position. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-14 And related content, the present invention is further described in detail:

[0023] A prestressed anchoring structure for a wind power tower without a cavity foundation, wherein a cylindrical boss 20 extending upward with the barrel facing upward is connected to the tower bottom foundation 10, and the boss 20 is inserted into the lower end barrel mouth of the tubular tower body lattice column 30, and the lower end of the prestressed cable bundle A extends from the tower top along the middle barrel cavity of the tower body lattice column 30 to the barrel cavity 21 of the boss 20, and the lower end of the prestressed cable bundle A is connected to a lower anchor ring 40, and a limiting mechanism 50 is provided in the barrel cavity 21 of the boss 20 to limit the upward displacement of the lower anchor ring 40.

[0024] The above technical solution eliminates the operating chamber of the tower base 10 in the prior art. The boss 20, a prefabricated component, is fixed to the tower base 10 during tower construction. After the boss 20 is plugged into the tower lattice column 30, the lower anchor ring 40, connected to the prestressed cable bundle A, is lowered from the tower top into the cylindrical cavity of the boss 20 along the tubular cavity of the tower lattice column 30. The lower anchor ring 40 is limited by a limiting mechanism 50, restricting its upward displacement. This allows the prestressed cable bundle A to be tensioned and pre-tightened at the tower top, and the upper anchor is then anchored to the upper end of the prestressed cable bundle A, thus achieving the overall anchoring of the prestressed cable bundle A. This solution accelerates the overall construction of the wind turbine tower. Furthermore, the elimination of the operating chamber significantly reduces the amount and cost of pouring the tower base, significantly shortening the construction period.

[0025] It should be noted that the entire protruding column 20 is still a columnar structure and can be formed by concrete casting, but a concave cavity is provided on its upper end surface 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 base 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 boss 20, while the upper end of the second anchor bolt 60b is connected to the connecting plate 31 protruding radially outward from the lower end of the tower lattice column 30. In this embodiment, the first anchor bolt 60a is used to connect to the boss 20 to secure it to the tower base 10, while the second anchor bolt 60b is used to connect to the tower lattice column 30 to secure it to the tower base 10.

[0027] It should be noted that the first anchor bolt 60a and the second anchor bolt 60b are not provided in only one, and a plurality of them can be pre-buried at intervals in the circumferential direction.

[0028] Further, if Figure 4 and Figure 5 As shown, the upper end of the first anchor bolt 60a extends through the body of the boss 20 along the core of the boss 20 and to the top surface of the boss 20. A retaining nut 61 is provided at the upper end of the first anchor bolt 60a, and the retaining nut 61 abuts against the top surface of the boss 20, constituting a positional engagement that limits the upward displacement of the boss 20. In this embodiment, a through hole is provided within the boss 20 for the passage of the first anchor bolt 60a. The retaining nut 61 abuts against the top surface of the boss 20 and is tightened, thereby securing the boss 20 to the tower base 10.

[0029] Further, if Figure 3 As shown, the lower end of the first anchor bolt 60a extends downward within the tower base 10 and is connected to a first stop plate 62a. The first stop plate 62a is arranged at an angle to the first anchor bolt 60a. In this embodiment, the first stop plate 62a is integrally connected to the first anchor bolt 60a. Along the length of the first anchor bolt 60a, the first stop plate 62a provides a stop surface that blocks the concrete structure of the tower base 10. This prevents the first anchor bolt 60a from separating or dislodging from the tower base 10 along its length, thereby strengthening the connection of the first anchor bolt 60a within the tower base 10.

[0030] Combine Figure 3-5 as well as Figure 8 As shown, the limiting mechanism 50 includes two limiting pads 51, and two limiting guide grooves 22 with opposite notches and groove depth directions arranged along the radial direction of the protruding column 20 are opened on the cylinder wall of the cylinder cavity 21. The two limiting pads 51 are respectively placed in the two limiting guide grooves 22, and a limiting guide 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 a blocking position that abuts against the upper end face of the lower anchor ring 40 and limits the upward displacement of the lower anchor ring 40, or in a separation position that avoids the upper and lower displacement paths of the lower anchor ring 40.

[0031] In this solution, after the lower anchor ring 40, connected to the prestressed cable strand A, is lowered along the central tubular cavity of the tower lattice column 30 to a designated position within the cylindrical cavity 21 of the boss 20, i.e., at a position where the upper end face of the lower anchor ring 40 is lower than the lower end face of the limiting pad 51, the limiting pad 51 is controlled to translate along the depth direction of the limiting guide groove 22 (i.e., the radial direction of the boss 20) into the cylindrical cavity 21 under the limiting and guiding action of the limiting guide groove 22 until the limiting pad 51 is located in the vertical displacement path of the lower anchor ring 40. At this point, when the prestressed cable strand A is tensioned and pre-tensioned upward at the tower top, the lower anchor ring 40 is prevented from upward movement by the limiting pad 51, thereby maintaining its position, allowing the prestressed cable strand A to be tensioned and pre-tensioned normally. On the contrary, when the prestressed cable bundle A needs to be replaced later, the limiting pad 51 is controlled to translate into the limiting guide groove 22 until the limiting pad 51 is in a separation 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 of the cylinder cavity 21 and lifted out from the tower top pipe mouth of the tower body lattice column 30.

[0032] It should be noted that if Figure 8 As shown, the limiting guide cooperation set between the limiting pad 51 and the limiting guide groove 22 can be achieved by limiting the limiting pad 52 by the groove wall of the limiting guide groove 22 itself, or by setting guide rails and sliders (guide rails and sliders are not drawn in the accompanying drawings) that cooperate with each other and are arranged along the radial direction of the boss 20 on the limiting pad 51 and the limiting guide groove 22 to limit the limiting pad 51 to only translate along the groove depth direction of the limiting guide groove 22.

[0033] Furthermore, the limiting mechanism 50 also includes a control rod 52, the rod length direction of the control rod 52 is consistent with the displacement direction of the pad 51, and a reserved channel P for the control rod 52 to pass through is provided on the tower body lattice column 30 and the boss 20. The reserved channel P passes through the bottom surface of the limiting guide groove 22, and a threaded hole is provided on the side of the limiting pad 51 adjacent to the bottom surface of the limiting guide groove 22. The inner rod end of the control rod 52 is threadedly connected with the threaded hole on the opposite limiting pad 51, and the outer rod end extends to the outside of the column of the tower body lattice column 30.

[0034] In this solution, 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 building the tower body, the tower lattice column 30 is docked with the boss 20, and the first anchor ring 60a and the second anchor bolt 60b are used for accurate positioning. The reserved hole P on the tower lattice column 30 is naturally aligned with the reserved hole P on the boss 20. After the lower anchor ring 40 is lowered along the middle tube cavity of the tower lattice column 30 to the specified position in the cylindrical cavity 21 of the boss 20, a control rod 52 is used from the outside of the tower lattice column 30 to be inserted into the reserved hole P and pushed inward until the control rod 52 contacts the limiting pad 51. Then, the control rod 52 is rotated so that the inner rod end of the control rod 52 is screwed into the threaded hole on the limiting pad 51 to achieve connection between the two. At this time, by pushing and pulling the control rod 52, the limiting pad 51 can be controlled to translate 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 that is relatively heavy and has a large friction force between it and the groove wall surface of the limiting guide groove 22. Therefore, when the control rod 52 contacts the limiting pad 51 and is screwed into the threaded hole, the screwing operation of the control rod 52 does not force the limiting pad 51 to move, thereby allowing the inner rod end of the control rod 52 to be screwed into the threaded hole normally. In addition, because a limiting guide 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 dock with the threaded hole.

[0036] Furthermore, the limiting pad 51 and the groove walls of the limiting guide groove 22 form a resistance-type sliding fit. On the one hand, it is to effectively limit the circumferential and upper and lower positions 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 to prevent the limiting pad 51 from sliding easily, thereby further providing a guarantee for the smooth docking of the control rod 52 and the threaded hole.

[0037] As a preferred solution, the two limiting pads 51 are overall C-shaped and the openings are arranged relative to each other. When one of the limiting pads 51 moves toward the other limiting pad 51 along the groove depth direction of the limiting guide groove 22 until the ends of the two limiting pads 51 are butted against each other, part of the two limiting pads 51 is located in the groove cavity of their respective corresponding limiting guide grooves 22. In order to prevent the limiting pad 51 from slipping into the cylinder cavity 21 along the groove depth direction of the limiting guide groove 22 due to an accident before the lower anchor ring 40 is lowered into the cylinder cavity 21 and being unable to be pulled back into the limiting guide groove 22 by the control rod 52, under the setting of this solution, even if one of the limiting pads 51 naturally slides toward the other limiting pad 51 along the groove depth direction of the limiting guide groove 22, the limiting pad 51 will not slide to the bottom of the cylinder cavity 21, but will slide until the ends of the two limiting pads 51 are butted against each other. At this time, the two limiting pads 51 are Part of the block 51 is located in the groove cavity of the corresponding limiting guide groove 22, that is, the limiting block 51 has not completely separated 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 be normally connected to the threaded hole on the limiting block 51, so that the limiting block 51 can be pulled back into the limiting guide groove 22 by using the control rod 52 to avoid the limiting block 51 being exposed in the cylinder cavity 21 and hindering the downward movement of the lower anchor ring 40.

[0038] It should be noted that when the C-shaped limiting pad 51 is set in a C shape and the two limiting guide grooves 22 are independent of each other, the radial dimension of the protrusion 20 should be made larger, and the diameter of the cylinder cavity 21 should be made as small as possible while ensuring that the lower anchor ring 40 can enter the ground. In this way, the groove depth of the limiting guide groove 22 can be lengthened to ensure that the two limiting pads 51 do not completely leave the limiting guide groove 22 even if they offset each other from the separation position to the blocking position. Of course, combined with Figure 8 As shown, the limiting pad 51 is in a strip-shaped shape as a whole, which can also ensure that it will not completely break away from the limiting guide groove 22, and can also be completely retracted into the limiting guide groove 22.

[0039] Furthermore, as a preferred solution, Figure 9 and Figure 10 As shown, the two limiting guide grooves 22 pass through the circumferential direction of the boss 20 to form an annular groove, which is coaxially arranged with the cylindrical cavity 21. When the limiting pads 51 are in the separation position to avoid 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 a gap is left between the opposite ends.

[0040] Figure 9 The diagram shows the state of the limiting pad 51 in the separation position. Figure 10 Shown is a schematic diagram of the state where the limiting pad 51 is in the blocking position.

[0041] In this embodiment, the limiting guide groove 22 is an annular groove, and the groove depth does not need to be too deep. The C-shaped limiting pad 51 is located in the groove cavity of the annular groove. When the C-shaped limiting pad 51 translates along the radial direction of the boss 20, its entire displacement reaches a position where its end abuts against the end of another C-shaped limiting pad 51. The C-shaped limiting pad 51 will not completely fall out of the limiting guide groove 22. This leaves room for adjustment when setting the size of the boss 20.

[0042] Further, if Figure 11 and Figure 12 As shown, the limiting pad 51 is in the shape of a semicircular 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 cylindrical cavity 21. This complete ring provides the lower anchor ring 40 with a larger pressure-bearing surface. After the prestressed cable A is tensioned and pre-tensioned, the force applied to each circumferential position of the lower anchor ring 40 is uniform, ensuring its stability.

[0043] Of course, in addition to setting two symmetrically arranged limiting pads 51, at least three limiting pads 51 can also be set at equal intervals in the circumferential direction of the boss 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 ring structure, and the circular ring structure is arranged concentrically with the cylindrical cavity 21. Figure 13 and Figure 14 As shown, a plurality of limiting pads 51 are combined to form the limiting mechanism 50 for resisting the lower anchor ring 30. Compared with only two C-shaped limiting pads 51, the present solution does not require too deep a groove of the limiting guide groove 22 by providing multiple C-shaped limiting pads 51. The size design of the boss 20 is more reasonable, which can meet the requirement that the limiting guide groove 22 can fully accommodate the limiting pads 51.

[0044] Here, combined Figure 9 、 Figure 11 as well as Figure 13 As shown by the arrow in , it is once again explained that the translational movement of the C-shaped limit pad 51 in the radial direction can be limited by the guide rail and slider arranged along the radial direction of the boss 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 groove wall or the lower groove wall of the limit guide groove 22 for setting, or it can be attached to the limit pad 51.

[0045] Combine 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 hole 41 on the lower anchor ring 40 and is clamped and fixed by a clip 42 arranged in the cable hole 41. A baffle 43 is arranged on the lower end surface of the lower anchor ring 40. The plate surface of the baffle 43 abuts against the lower end of the clip 42 and restricts the clip 42 from downwardly escaping from the cable hole 41. The baffle 43 is provided with a hole for the steel strand A1 to pass through. In this solution, the solution adopted is that the prestressed cable bundle A is pre-connected with the lower anchor ring 40 and then lowered into the cylindrical cavity 21 of the boss 20. During the lowering process, the steel strand A1 constituting the prestressed cable bundle A has not been tensioned or pre-tightened. Therefore, in order to avoid the situation in which the clip 42 loosens during the process of lowering the anchor ring 40, causing the steel strand A1 to detach from the cable hole 41 on the lower anchor ring 40 and causing the lower anchor ring 40 to fall, the baffle 43 is used to support the outer end of the clip 42, thereby preventing the clip 42 from falling off from the cable hole 41, so that the clip 42 can provide a stable clamping constraint on the steel strand A1, thereby ensuring a stable connection between the steel strand A1 and the lower anchor ring 40.

[0046] As a preferred embodiment, the upper cylindrical portion of the boss 20 is formed by an annular anchor plate 70, which is arranged concentrically with the boss 20. The first anchor bolt 60a extends through the anchor plate 70, and the limit nut 61 abuts against the upper end surface of the anchor plate 70. The anchor plate 70, made of alloy material, provides reliable and strong rigid support for pre-tightening the first anchor bolt 60a. At the same time, the top groove wall of the limiting guide groove 22 can also be directly formed by the lower end surface of the anchor plate 70. In this way, the limiting plate 51 is first placed into the limiting guide groove 22, and then the anchor plate 70 is covered, which facilitates the installation of the limiting plate 51 into the limiting guide groove 22.

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

[0048] Furthermore, if Figure 3 As shown, the lower end of the second anchor bolt 60b is connected to a second limiting plate 62b, which 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 provided to strengthen the connection between the second anchor bolt 60b and the tower base 10.

[0049] Combine Figure 4-6As shown, the lower end of the tower lattice column 30 is a stepped hole with a large outer diameter and a small inner diameter. The boss 20 is located within the large-diameter section of the stepped hole. The opening of the barrel cavity 21 is arranged directly opposite the opening of the small-diameter section of the stepped hole, and the size of the opening is greater than or equal to the size of the opening of the small-diameter section of the stepped hole. If the barrel wall of the boss 20 is relatively thick, the large-diameter section of the stepped hole is utilized to align the barrel wall of the boss 20 with the opening of the small-diameter section, and the size of the opening is greater than or equal to the size of the opening of the small-diameter section of the stepped hole. This prevents the lower anchor ring 40 from being blocked by the top end face of the boss 20 and being unable to fall when lowering.

[0050] Of course, the wall of the boss 20 can be thinner, but the limiting guide groove 22 needs to be formed by radially extending outward from the wall. Furthermore, the opening of the cylinder cavity 21 can also be configured to be tapered and expanded to provide a guiding effect, thereby guiding the lower anchor ring 40 into the cylinder cavity 21.

[0051] Furthermore, a downwardly projecting 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 from 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 barrel cavity 21. The function of the guide tube 32 is to assist in guiding the lower anchor ring 40 into the barrel cavity 21 of the boss 20.

[0052] Finally, it should be noted that the solution of the present application is not limited to the prestressed anchoring system of the lattice tower, but can also be applied to other similar prestressed anchoring systems.

Claims

1. A prestressed anchoring structure for a wind power tower without a cavity foundation, characterized by: A cylindrical convex column (20) extending upward with its tube mouth facing upward is connected to the tower bottom foundation (10), and the convex column (20) is inserted into the lower end tube mouth of the tubular tower body lattice column (30). The lower end of the prestressed cable bundle (A) extends from the tower top along the middle tube cavity of the tower body lattice column (30) to the tube cavity (21) of the convex column (20), and the lower end of the prestressed cable bundle (A) is connected to a lower anchor ring (40). A limiting mechanism (50) for limiting the upward displacement of the lower anchor ring (40) is provided in the tube cavity (21) of the convex column (20).

2. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 1, characterized in that: A first anchor bolt (60a) and a second anchor bolt (60b) are pre-buried in the tower base (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 a connecting plate (31) protruding radially outward from the lower end of the tower lattice column (30).

3. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 2, characterized in that: The upper end of the first anchor bolt (60a) passes through the column body of the boss (20) along the column core direction of the boss (20) and extends to the top surface of the boss (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 boss (20) to form a limiting fit that limits the upward displacement of the boss (20).

4. The prestressed anchor structure for a wind power tower cavity-free foundation 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 a first limiting plate (62a). The plate surface of the first limiting plate (62a) and the first anchor bolt (60a) are arranged at an angle.

5. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 1, characterized in that: The limiting mechanism (50) includes two limiting pads (51), and two limiting guide grooves (22) are provided on the wall of the cylindrical cavity (21), the grooves of which are opposite to each other and the groove depth direction is arranged along the radial direction of the protruding column (20). The two limiting pads (51) are respectively placed in the two limiting guide grooves (22), and a limiting guide 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 a blocking position that abuts against the upper end surface of the lower anchor ring (40) and limits the upward displacement of the lower anchor ring (40), or in a separation position that avoids the upper and lower displacement paths of the lower anchor ring (40).

6. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 5, characterized in that: The limiting mechanism (50) further includes a control rod (52), the rod length direction of the control rod (52) being consistent with the displacement direction of the pad (51), a reserved channel (P) for the control rod to pass through is provided on the tower body lattice column (30) and the convex column (20), the reserved channel (P) passes through the bottom surface of the limiting guide groove (22), a threaded hole is provided on one side of the limiting pad (51) adjacent to the bottom surface of the limiting guide groove (22), an inner rod end of the control rod (52) is threadedly connected to the threaded hole on the opposite limiting pad (51), and an outer rod end extends to the outside of the column of the tower body lattice column (30).

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

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

9. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 8, characterized in that: The two limiting guide grooves (22) are connected in the circumferential direction of the boss (20) to form an annular groove. The annular groove is arranged concentrically with the cylindrical cavity (21). When the limiting pad (51) is in a separation position to avoid 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 a gap is left between the opposite ends.

10. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 9, characterized in that: The limiting pad (51) is in the shape of a semicircular ring block as a whole. 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 circular ring structure, and the circular ring structure is arranged coaxially with the cylindrical cavity (21).

11. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 9, characterized in that: At least three limiting pads (51) are arranged at equal intervals in the circumferential direction of the boss (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 ring structure, and the circular ring structure is arranged coaxially with the cylindrical cavity (21).

12. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 1, characterized in that: The lower end of the steel strand (A1) constituting the prestressed cable bundle (A) is passed through the cable hole (41) on the lower anchor ring (40) and is clamped and fixed by a clip (42) arranged in the cable hole (41). A baffle (43) is arranged on the lower end surface of the lower anchor ring (40). The plate surface of the baffle (43) abuts against the lower end of the clip (42) and restricts the clip (42) from downwardly escaping from the cable 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 wind power tower cavity-free foundation according to claim 3 or 5, characterized in that: The upper end column portion of the boss (20) is composed of an annular anchor plate (70), the anchor plate (70) and the boss (20) are arranged concentrically, the first anchor bolt (60a) passes through the anchor plate (70), and the limiting nut (61) abuts against the upper end surface of the anchor plate (70).

14. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 2, characterized in that: The lower end of the boss (20) is connected to the base plate (23), 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 wind power tower cavity-free foundation 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 plate surface of the second limiting plate (62b) and the second anchor bolt (60b) are arranged at an angle.

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

17. The prestressed anchoring structure for a wind power tower cavity-free foundation according to claim 16, characterized in that: A downwardly protruding guide tube (32) is coaxially arranged at the hole edge of the small-diameter section of the stepped hole. The inner wall of the guide tube (32) is flush with and extends in parallel with 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 barrel cavity (21).

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