Prestressed anchoring structure for wind turbine tower foundation
By installing sleeves and sealing rings on the steel strands of wind turbine towers, the problems of steel strand corrosion and complex replacement are solved, achieving efficient anti-corrosion sealing and convenient steel strand replacement, thus improving construction efficiency and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI VSL ENG CORP ON LIM
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-10
AI Technical Summary
In existing technologies, the steel strands of wind turbine towers are prone to corrosion at the splice joints, which leads to a shortened service life. Furthermore, the process of replacing steel strands involves complex operations that damage the sealing filler, affecting construction progress and costs.
A sleeve is installed over the steel strand, and sealing rings and sealing fillers are installed at the anchor seat and anchor ring to form a sealed fit, preventing water droplets from sliding down the strand to the exposed core section. The sleeve can be used to replace the steel strand independently without damaging the sealing filler.
This allows for the individual replacement of steel strands without damaging the sealant, improving construction efficiency and corrosion protection, avoiding damage to the sealant and the need for refilling, and reducing construction costs and time waste.
Smart Images
Figure CN224478479U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to wind turbine towers, specifically to a prestressed anchoring structure for wind turbine tower foundations. Background Technology
[0002] Wind turbine towers mostly adopt steel-concrete composite (SPC) structures. This structure uses a concrete tower at the bottom and a steel tower at the top. The concrete tower is prefabricated in sections and assembled and hoisted on site. After hoisting, prestress is applied to the entire concrete tower through steel strand bundles to make it a whole and improve the bending resistance of the assembled tower.
[0003] like Figure 1 As shown, tower body 1 is assembled from multiple tower sections and is located on foundation A at the bottom of the tower. Steel strand B is threaded between anchoring platforms A1 on the inner side of the tower top and foundation A and is pre-tensioned. Anchoring platform A1 has pre-drilled holes for the steel strand B to pass through, thus anchoring the lower end of the steel strand B to anchorage 2 below anchoring platform A1. Further details are as follows... Figure 2 As shown, in the prior art, the PE sheath B2 on the part of the steel strand B near the anchor 2 needs to be peeled off, so that the exposed section B1 of the steel strand core can be clamped and fixed by the clamps set in the cable hole on the anchor 2 to prevent the steel strand B from loosening.
[0004] Because tower body 1 is assembled from multiple tower sections, there are joints between adjacent tower sections, and these joints are often quite large in reality. During windy and rainy weather, rainwater from the external environment is often blown into tower body 1 through these joints and drips onto the steel strands B. As water droplets gradually accumulate on steel strand B, they slide down under gravity until they reach the anchor 2 below the anchoring platform A1. Since the PE sheath B2 of steel strand B is peeled off at this point, water droplets seep through the gaps and come into contact with the exposed core section B1 of the steel strand, gradually corroding it and severely shortening its normal service life.
[0005] The patent document entitled "Anchor" (publication number CN200999420Y, hereinafter referred to as Document 1) is the applicant's earlier application. In the disclosed technical solution, the end of the steel strand is held by a clamp, the conical outer wall of the clamp matches the conical hole opened on the anchor ring, the anchor ring is fixed on the cast iron anchor seat, the inner side of the anchor seat is connected to a polypropylene flared tube, the inner side of the polypropylene flared tube is connected to a plastic corrugated tube, and the cavity between the polypropylene flared tube, the corrugated tube, the anchor ring, and the anchor seat is filled with a filler. This solution can effectively avoid corrosion of components, thereby effectively providing service life and reliability.
[0006] In Reference 1, injecting filler into the cavities of the corrugated pipe or anchor can prevent rainwater from sliding down the steel strands and contacting the exposed core. However, during the use and maintenance of wind turbine towers, the natural corrosion levels of each steel strand vary, often necessitating the individual replacement of some strands. In Reference 1, the filler, after solidification, directly wraps around the outer wall of the steel strands. When a strand needs replacement, the solidified filler exerts a strong binding force, making it difficult to remove the strand. This necessitates damaging the filler, which is extremely difficult due to the space constraints of the anchor structure and can easily cause irreversible damage to strands that don't need replacement. Furthermore, when the filler is damaged, the transmission of the destructive force essentially renders it ineffective in protecting all steel strands from corrosion, requiring refilling and waiting for it to solidify again. This process is costly, time-consuming, and severely delays construction progress. Summary of the Invention
[0007] This utility model provides a prestressed anchoring structure for wind turbine tower foundations, which allows for the individual replacement of steel strands without damaging the sealing filler. It ensures the waterproof sealing of the exposed section of the steel strand core while improving the efficiency of steel strand replacement construction.
[0008] To achieve the above objectives, the technical solution adopted is as follows: a prestressed anchoring structure for wind turbine tower foundations, wherein an anchoring platform suspended on the inner side of the tower base foundation has a pre-embedded pipe arranged from top to bottom and penetrating the anchoring platform body. The lower end of the pre-embedded pipe is connected to an anchor seat that is integrally tubular and the core directions of the two are consistent. An anchor ring is set at the lower end of the anchor seat at the pipe opening area. The steel strand passes through the pre-embedded pipe, the anchor seat, and the corresponding cable-passing holes on the anchor ring, and the exposed section of the steel strand core is fixed by a clamp set in the cable-passing hole. The anchor seat is also provided with a bypass hole that connects to the middle cavity and is used to inject sealing filler into the cavity. The steel strand is covered with a sleeve, the lower end of which abuts the anchor ring. A first sealing ring is set between the upper end of the sleeve and the outer peripheral wall of the steel strand to form a sealing fit. The upper end surface of the sealing filler injected into the anchor seat cavity is lower than the height of the first sealing ring.
[0009] Compared with existing technologies, the technical advantages of this invention are as follows: A sleeve is fitted over the outer layer of the steel strand, isolating the sealing filler from the strand itself. This creates a seal between the sealing filler and the outer wall of the sleeve. Furthermore, the lower end of the sleeve abuts against the anchor ring, and the upper end of the sleeve seals against the outer wall of the steel strand. This effectively prevents water from dripping onto the strand or the sleeve from slipping onto the exposed core section at the anchor ring, ensuring a corrosion-resistant seal for the exposed section. Additionally, when replacing a single steel strand, since the strand is not directly wrapped by the sealing filler, there is no need to damage the filler or move the sleeve. The strand can simply be pulled out of the sleeve for replacement, and a first sealing ring can be added. This greatly simplifies the steel strand replacement process. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of an existing wind turbine tower.
[0011] Figure 2 This is a schematic diagram of the anchorage structure at the base of a wind turbine tower in the existing technology;
[0012] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model;
[0013] Figure 4 for Figure 3 A partial structural diagram;
[0014] Figure 5 This is a schematic diagram of the structure of the first sealing ring;
[0015] Figure 6 This is a schematic diagram of a first embodiment of the first sealing ring;
[0016] Figure 7 This is a schematic diagram of a second embodiment of the first sealing ring;
[0017] Figure 8 This is a schematic diagram of the second sealing ring;
[0018] Figure 9 This is a schematic diagram of the wire splitting coil;
[0019] Figure 10 This is a schematic diagram of the positioning plate;
[0020] Figure 11 This is a schematic diagram of the structure of the second embodiment of the present invention. Detailed Implementation
[0021] The following is in conjunction with the appendix Figure 1-11 The present invention will be further described in detail below, including related content:
[0022] The structure of steel strand B is further explained below. Steel strand B consists of an inner core B3 and an outer sheath B2. The function of sheath B2 is to protect the inner core B3. However, when anchoring steel strand B with anchors, a section of sheath B2 needs to be cut off at the upper and lower ends of steel strand B to expose the inner core B3. The exposed section B1 of the core can then be clamped by the clamps on the anchor to achieve the anchoring operation of steel strand B.
[0023] Example 1
[0024] A prestressed anchoring structure for a wind turbine tower foundation includes an anchoring platform A1 suspended inside the tower foundation A. An embedded pipe 10 is pre-embedded within the platform, arranged from top to bottom and penetrating the entire structure of the anchoring platform A1. The lower end of the embedded pipe 10 is connected to an integrally tubular anchor seat 20, with both pipes having the same core direction. An anchor ring 30 is positioned at the lower end of the anchor seat 20 in the pipe opening area. A steel strand B passes through the corresponding cable-passing holes 31 on the embedded pipe 10, anchor seat 20, and anchor ring 30, and is positioned within the cable-passing holes 31. The clamps fix the exposed section B1 of the core of the steel strand B. The anchor seat 20 is also provided with a bypass hole 21 that connects to the middle cavity and is used to inject the sealing filler C into the cavity. The steel strand B is covered with a sleeve 40. The lower end of the sleeve 40 abuts against the anchor ring 30. The upper end of the sleeve 40 and the outer peripheral wall of the steel strand B are provided with a first sealing ring 50 to form a sealing fit. The upper end of the sealing filler C injected into the cavity of the anchor seat 20 is lower than the height of the first sealing ring 50.
[0025] In the above technical solution, a sleeve is installed on the outside of the steel strand B. The sleeve 40 isolates the sealing filler C from the steel strand B. After the sealing filler C solidifies, it fits tightly against the outer wall of the sleeve 40, forming a seal between the sealing filler C and the outer wall of the sleeve 40. In addition, the lower end of the sleeve 40 abuts against the anchor ring 30, and the upper end of the sleeve 40 is sealed to the outer peripheral wall of the steel strand B by a first sealing ring 50. Water dripping onto the steel strand B above the sleeve 40 slides down the steel strand B and, after passing through the first sealing ring 50, slides onto the outer wall of the sleeve 40 instead of entering the sleeve 40. As the water droplet continues to slide down the sleeve 40, the seal between the sealing filler C and the outer wall of the sleeve 40 forms a seal, preventing the water droplet from continuing to slide down the outer wall of the sleeve 40. Consequently, the water droplet cannot slide down to the exposed core section B1 at the lower end of the steel strand B, thus preventing it from contacting and corroding the exposed core section B1, thereby achieving the effect of corrosion prevention and sealing.
[0026] When replacing a single steel strand B, since steel strand B is not in direct contact with the sealing filler C, the sleeve 40 can remain stationary, eliminating the need to damage the sealing filler C and maintaining the effective seal between the sleeve 40 and the sealing filler C. Simply remove the clamps from holding steel strand B and pull it out of the anchor ring 30 and sleeve 40. The first sealing ring 50 can also be removed from the old steel strand B. Then, the new steel strand B is re-inserted into the sleeve 40 and secured again with the clamps. Of course, the first sealing ring 50 must be re-applied when inserting the new steel strand B to seal the upper end of the sleeve 40 against the outer wall of the steel strand B. This solution greatly simplifies the single-strand replacement operation without damaging the sealing filler C and while ensuring a tight seal.
[0027] This solution refers to the anchoring method at the lower end of steel strand B. The anchoring method at the top of the tower for steel strand B will not be discussed in detail here; normal anchorage can be used for anchoring.
[0028] As a preferred embodiment, the cavity of the anchor 20 is filled with a sealing filler C composed of concrete or sealant. After the concrete or sealant solidifies, it can tightly wrap around the sleeve 40, achieving an effective sealing fit between the two.
[0029] Combination Figure 4 As shown, the bypass hole 21 serves as a channel for injecting sealing filler C into the cavity of the anchor 20. The outlet of the bypass hole 21 is located on the inner wall of the cavity of the anchor 20, and its position is higher than the lower end face of the anchor 20. The inlet of the bypass hole 21 is located on the lower end face of the anchor 20. The upper end face of the sealing filler C is located between the upper and lower edges of the outlet of the bypass hole 21 or flush with the lower edge. In this design, the lower end opening of the bypass hole 21 is the inlet, and the upper end opening is the outlet. A sealing filler C of a certain thickness can be injected into the cavity of the anchor 20 through the bypass hole 21 to form a sealing filler C. Here, the upper surface of the sealing filler C is positioned between or flush with the lower edge of the bypass hole 21 outlet. This allows water adhering to the outer wall of the sleeve 40 to slide down to the upper surface of the sealing filler C, where it can be discharged through the bypass hole 21, preventing water accumulation in the anchor 20 or the embedded pipe 10. Of course, under normal circumstances, even without the bypass hole 21 for drainage, not much water will accumulate; it will gradually evaporate naturally. However, the evaporation rate is slow and may affect the structural lifespan. Therefore, the bypass hole 21 serves not only as an injection channel but also as a drainage channel.
[0030] As a preferred option, such as Figure 3As shown, the upper end of the sleeve 40 extends upward to the outside of the cavity of the embedded pipe 10. The space outside the cavity of the embedded pipe 10 is large, which facilitates the sealing operation between the upper end of the sleeve 40 and the steel strand B.
[0031] Combination Figure 3 , Figure 5 as well as Figure 6 As shown, the first sealing ring 50 includes a small-diameter section 51 and a large-diameter section 52 connected from top to bottom. The inner wall joint of the small-diameter section 51 and the large-diameter section 52 is connected by a stepped surface 53. The upper end of the sleeve 40 is inserted into the large-diameter section 52. The inner wall of the small-diameter section 51 is fitted and sealed with the outer peripheral wall of the steel strand B.
[0032] In this design, the small-diameter section 51 is fitted over the outside of the steel strand sheath B2 to achieve a sealing fit between the first sealing ring 50 and the steel strand B. The large-diameter section 52 is fitted over the outside of the sleeve 40 to achieve a sealing fit between the first sealing ring 50 and the sleeve 40. Therefore, when water on the steel strand B slides down to the position of the first sealing ring 50, it will not enter the interior of the first sealing ring 50 or the sleeve 40, thus preventing water on the steel strand B from sliding down the strand body onto the exposed core section B1.
[0033] Furthermore, a radially inwardly protruding sealing ring 511 is provided on the inner peripheral wall of the small-diameter section 51. The sealing ring 511 and the outer peripheral wall of the steel strand B form a pressure-type sealing fit. The sealing ring 511 presses tightly against the outer peripheral wall of the steel strand sheath B2 to ensure the sealing effect.
[0034] In addition, this application also provides another sealing method between the upper end of the sleeve 40 and the steel strand B, such as... Figure 7 As shown, the first sealing ring 50 is fitted onto the outer wall of the steel strand B above the sleeve 40. The lower end face of the first sealing ring 50 abuts against the upper end face of the sleeve 40. A tubular sealing protective sleeve 54 is fitted onto the upper end section of the sleeve 40. The inner wall of the upper end of the sealing protective sleeve 54 protrudes inward to form a stepped portion 541. The upper end face and outer peripheral face of the first sealing ring 50 abut against the lower end face of the stepped portion 541 and the inner peripheral wall of the sealing protective sleeve 54, respectively, to form a sealing fit. By using the first sealing ring 50 to abut against the outer wall of the steel strand B, the inner peripheral wall of the sealing protective sleeve 54, and the lower end face of the stepped portion 541, an effective seal can be achieved at the upper end of the sleeve 40. The first sealing ring 50 is housed inside the sealing protective sleeve 54. The sealing protective sleeve 54 prevents the first sealing ring 50 from being directly exposed to the external environment, reducing the aging and corrosion rate of the first sealing ring 50 and extending its service life.
[0035] It should be noted that when the first sealing ring 50 adopts an integrated design with a small-diameter section 51 and a large-diameter section 52, a protective sealing sleeve 54 can also be placed over it to house the first sealing ring 50. The specific shape of the protective sealing sleeve 54 does not need to be strictly limited, as long as it can accommodate the first sealing ring 50. Of course, a tubular protective sealing sleeve 54 can also be used, but its shape needs to be slightly modified to better fit the shape of the first sealing ring 50.
[0036] As a preferred solution, combined with Figure 4 as well as Figure 8 As shown, the upper opening of the cable-passing hole 31 on the anchor ring 30 is a stepped hole with a larger outer diameter and a smaller inner diameter. A second sealing ring 60 is fitted onto the steel strand B inside the stepped hole. The lower end of the sleeve 40 is inserted into the cable-passing hole 31, and the lower end face of the sleeve 40 abuts against the second sealing ring 60 to form a sealing fit. In this scheme, the second sealing ring 60 is a more reliable waterproofing solution. That is, if a gap is formed between the outer wall of the sleeve 40 and the sealing filler C, the second sealing ring 60 can ensure that water seeping through the gap will not enter the sleeve 40 through the lower opening and come into contact with the exposed core section B1 of the steel strand B. The dual setting of the second sealing ring 60 and the sealing filler C can provide a more effective sealing guarantee for the lower opening of the sleeve 40.
[0037] Furthermore, combined Figure 10 As shown, the lower ends of each sleeve 40 are connected to a positioning plate 80. The positioning plate 80 is in the shape of a perforated disc. The sleeve 40 is inserted into the holes on the positioning plate 80 and the lower end face of the sleeve 40 is located below the positioning plate 80.
[0038] Considering that inserting each sleeve 40 into the cable-passing hole 31 one by one is inconvenient, in this solution, the positioning plate 80 serves as a connector, allowing the sleeves 40 to be pre-connected together to form a whole. During installation, all sleeves 40 can be inserted into the pre-embedded pipe 40 simultaneously. Since the lower end face of the sleeve 40 is below the positioning plate 80, the protruding section of the lower end of the sleeve 40 from the positioning plate 80 can serve as a positioning reference for aligning with the cable-passing hole 31.
[0039] It should be noted that the overall hole distribution on the positioning plate 80 is consistent with the hole distribution of the cable-passing holes 31 on the anchor ring 30, so as to ensure that all sleeves 40 can be accurately inserted into the corresponding cable-passing holes 31.
[0040] like Figure 6 As shown, to facilitate the replacement of steel strand B, the inner wall of the sleeve 40 is spaced apart from the outer circumferential wall of the steel strand B. The sleeve 40 is not tightly fitted onto the outer wall of the steel strand sheath B2, which makes it easier to remove or insert the steel strand B from the sleeve 40.
[0041] like Figure 3 As shown, in order to provide corrosion protection and sealing for the exposed core section B1 below the anchor ring 30, a corrosion protection cover 32 is connected to the lower end face of the anchor ring 30. The exposed core section B1 is located inside the corrosion protection cover 32, and the corrosion protection cover 32 is filled with corrosion-resistant filler, thereby protecting the exposed core section B1 and preventing moisture from the external environment from directly contacting the exposed core section B1.
[0042] As a preferred option, such as Figure 3 and Figure 9 As shown, a columnar wire-splitting ring 70 is provided inside the pre-embedded pipe 10, and the wire-splitting ring 70 has a through hole 71 for the sleeve 40 to pass through. The wire-splitting ring 70 is located at the upper end of the pre-embedded pipe 10, and the outer circumferential surface of the wire-splitting ring 70 abuts against the inner wall of the pre-embedded pipe 10. In this scheme, the purpose of setting the wire-splitting ring 70 is to support and position the upper end of each sleeve 40, ensuring the overall posture stability of the sleeve 40 within the pre-embedded pipe 10, and preventing the sleeve 40 from vibrating significantly, which would affect its sealing effect with the sealing filler C. This is because during the use of the wind turbine tower, the steel strand B experiences wire vibration, and the vibration of the steel strand B is transmitted to the sleeve 40.
[0043] Example 2
[0044] A prestressed anchoring structure for a wind turbine tower foundation includes an anchoring platform A1 suspended inside the tower base foundation A. An embedded pipe 10 is pre-embedded within the platform, arranged from top to bottom and penetrating the entire structure of the anchoring platform A1. The lower end of the embedded pipe 10 is connected to an integrally tubular anchor seat 20, with both pipes having the same core direction. An anchor ring 30 is provided on the lower end face of the anchor seat 20. A steel strand B passes through corresponding cable-passing holes 31 on the embedded pipe 10, anchor seat 20, and anchor ring 30, and is secured by clamps provided within the cable-passing holes 31. The exposed section B1 of the core of the steel strand B is fixed. The steel strand B is characterized by having a sleeve 40 on its outer sleeve. The upper end of the sleeve 40 extends to the outside of the cavity of the pre-embedded pipe 10, and the lower end extends downward along the length of the pre-embedded pipe 10. A first sealing ring 50 is provided between the upper end of the sleeve 40 and the outer peripheral wall of the steel strand B to form a sealing fit. A sealing filler C is provided in the upper end of the pre-embedded pipe 10, and the lower end surface of the sealing filler C is higher than the lower end of the sleeve 40.
[0045] Combination Figure 11As shown, the difference between the above technical solution and Embodiment 1 is that the sealing filler C is not placed inside the cavity of the anchor 20, but is injected and formed at the upper end of the pre-embedded pipe 10. The principle is the same as that of Embodiment 1, only the location of the sealing filler C is different. In this solution, when injecting the sealing filler C, corresponding pre-components need to be set inside the pipe opening of the pre-embedded pipe 10, such as the wire-splitting ring 70 in Embodiment 1, or some plates can be arranged to support the uncured sealing filler C so that it can solidify at the pipe opening. Of course, the sealing filler C setting scheme in this embodiment can also be used simultaneously with the sealing filler C setting scheme in Embodiment 1 to ensure the sealing effect.
[0046] Finally, it should be noted that the anchoring structure of this application is not limited to the prestressed anchoring system of wind turbine towers, but can also be applied to other similar prestressed anchoring systems.
Claims
1. A prestressed anchoring structure for a wind turbine tower foundation, wherein an anchoring platform (A1) suspended inside the tower base foundation (A) is pre-embedded with a pre-embedded pipe (10) arranged from top to bottom and penetrating the anchoring platform (A1). The lower end of the pre-embedded pipe (10) is connected to an anchor seat (20) that is integrally tubular and the core directions of the two are consistent. An anchor ring (30) is provided at the lower end of the anchor seat (20) at the pipe opening area. A steel strand (B) passes through the pre-embedded pipe (10), the anchor seat (20), and the corresponding cable-passing holes (31) on the anchor ring (30), and the exposed section (B1) of the core of the steel strand (B) is fixed by a clamp provided in the cable-passing hole (31). The anchor seat (20) is also provided with a bypass hole (21) that connects to the middle cavity and is used to inject sealing filler (C) into the cavity. The structure is characterized in that: The steel strand (B) is covered with a sleeve (40), the lower end of the sleeve (40) abuts against the anchor ring (30), and a first sealing ring (50) is provided between the upper end of the sleeve (40) and the outer peripheral wall of the steel strand (B) to form a sealing fit. The upper end of the sealing filler (C) injected into the cavity of the anchor seat (20) is lower than the height of the first sealing ring (50).
2. The prestressed anchorage structure for wind turbine tower foundations according to claim 1, characterized in that: The cavity of the anchor (20) is filled with a sealing filler (C) made of concrete or sealant.
3. The prestressed anchorage structure for wind turbine tower foundations according to claim 2, characterized in that: The outlet of the bypass hole (21) is located on the inner wall of the cavity of the anchor (20) and the outlet is located higher than the lower end face of the anchor (20). The inlet of the bypass hole (21) is located on the lower end face of the anchor (20). The upper end face of the sealing filler (C) is located between the upper and lower edges of the outlet of the bypass hole (21) or flush with the lower edge.
4. The prestressed anchorage structure for wind turbine tower foundations according to claim 1, characterized in that: The upper end of the sleeve (40) extends upward to the outside of the cavity of the pre-embedded pipe (10).
5. The prestressed anchorage structure for wind turbine tower foundations according to any one of claims 1-4, characterized in that: The first sealing ring (50) includes a small-diameter section (51) and a large-diameter section (52) that are connected from top to bottom. The inner wall joint of the small-diameter section (51) and the large-diameter section (52) is connected by a stepped surface (53). The upper end of the sleeve (40) is inserted into the large-diameter section (52). The inner wall of the small-diameter section (51) is sealed to the outer peripheral wall of the steel strand (B).
6. The prestressed anchorage structure for wind turbine tower foundations according to claim 5, characterized in that: The inner peripheral wall of the small-diameter section (51) is provided with a sealing ring (511) that protrudes radially inward. The sealing ring (511) and the outer peripheral wall of the steel strand (B) form a pressure-type sealing fit.
7. The prestressed anchorage structure for wind turbine tower foundations according to any one of claims 1-4, characterized in that: The first sealing ring (50) is fitted on the outer wall of the steel strand (B) above the sleeve (40). The lower end face of the first sealing ring (50) abuts against the upper end face of the sleeve (40). A tubular sealing protective sleeve (54) is fitted on the upper end section of the sleeve (40). The inner wall of the upper end of the sealing protective sleeve (54) protrudes inward to form a step (541). The upper end face and outer peripheral face of the first sealing ring (50) abut against the lower end face of the step (541) and the inner peripheral wall of the sealing protective sleeve (54) to form a sealing fit.
8. The prestressed anchorage structure for wind turbine tower foundations according to claim 1 or 2, characterized in that: The upper end of the cable-passing hole (31) on the anchor ring (30) is a stepped hole with a large outer diameter and a small inner diameter. The steel strand (B) located in the stepped hole is fitted with a second sealing ring (60). The lower end of the sleeve (40) is inserted into the cable-passing hole (31) and the lower end face of the sleeve (40) abuts against the second sealing ring (60) to form a sealing fit.
9. The prestressed anchorage structure for wind turbine tower foundations according to claim 8, characterized in that: The lower ends of each sleeve (40) are connected to a positioning plate (80). The positioning plate (80) is in the shape of a perforated disc. The sleeve (40) is inserted into the hole on the positioning plate (80) and the lower end face of the sleeve (40) is below the positioning plate (80).
10. The prestressed anchorage structure for wind turbine tower foundations according to claim 1, characterized in that: The inner wall of the sleeve (40) and the outer wall of the steel strand (B) are arranged alternately.
11. The prestressed anchorage structure for wind turbine tower foundations according to claim 1, characterized in that: The lower end face of the anchor ring (30) is connected to the anti-corrosion cover (32), the exposed core section (B1) is located inside the anti-corrosion cover (32) and the anti-corrosion cover (32) is filled with anti-corrosion filler.
12. The prestressed anchorage structure for wind turbine tower foundations according to claim 1, characterized in that: The embedded pipe (10) is provided with a columnar wire splitting ring (70) and the wire splitting ring (70) is provided with a through hole (71) for the sleeve (40) to pass through. The wire splitting ring (70) is located at the upper end of the embedded pipe (10) and the outer circumference of the wire splitting ring (70) abuts against the inner wall of the embedded pipe (10).
13. A prestressed anchoring structure for a wind turbine tower foundation, wherein an anchoring platform (A1) suspended inside the tower base foundation (A) has a pre-embedded pipe (10) arranged from top to bottom and penetrating the anchoring platform (A1). The lower end of the pre-embedded pipe (10) is connected to an anchor seat (20) that is integrally tubular and the core directions of the two are consistent. An anchor ring (30) is provided on the lower end face of the anchor seat (20). A steel strand (B) passes through the pre-embedded pipe (10), the anchor seat (20), and the corresponding cable-passing holes (31) on the anchor ring (30), and is fixed by a clamp set in the cable-passing hole (31) for the exposed section (B1) of the core of the steel strand (B). The structure is characterized in that: The steel strand (B) is covered with a sleeve (40). The upper end of the sleeve (40) extends to the outside of the cavity of the pre-embedded pipe (10), and the lower end extends downward along the length of the pre-embedded pipe (10). A first sealing ring (50) is provided between the upper end of the sleeve (40) and the outer peripheral wall of the steel strand (B) to form a sealing fit. A sealing filler (C) is provided in the upper end of the pre-embedded pipe (10), and the lower end surface of the sealing filler (C) is higher than the lower end of the sleeve (40).