A foundation structure for installation under a wind power tower

Abstract

This invention discloses an installation foundation structure for wind power towers, comprising a base and a subgrade beneath the base. The subgrade has a first and a second pouring groove. Multiple main structures are installed at the outer end of the base. Each main structure includes a locking block, with a first reinforcing device installed in the center of the locking block. A second reinforcing device is slidably connected to the center of the first reinforcing device. Concrete is poured into the first and second pouring grooves and the base. The first reinforcing device includes a hollow tube with multiple slots on the outer side of its lower end. This design addresses the problems of slippage and concrete cracking in traditional foundations, improving the stability of the installation foundation structure. It also ensures the continuous tightness of the connection between the main structures, enhancing the shear resistance of the installation foundation structure. Furthermore, it solves the problem of poor bonding between traditional foundations and the surrounding soil, fully utilizing the strength of the original soil and improving the overall load-bearing capacity of the installation foundation structure.

Description

Technical Field

[0001] This invention relates to the field of wind turbine foundation installation, and more specifically, to an installation foundation structure for wind turbine towers. Background Technology

[0002] Wind power generation, as a clean and efficient renewable energy technology, has achieved large-scale development. As the core load-bearing structure, the quality of the foundation installation of the wind power tower directly determines the operational stability and service life of the unit, making it a key link in the construction of wind power projects. Existing wind turbine tower foundations mostly use straight-rod type bored piles, which mainly rely on pile side friction to balance the load. However, the huge overturning moment generated by tall wind turbines will cause a huge uplift force on the leeward side. Traditional straight piles lack physical expansion or snap-fit ​​structure at the bottom, resulting in low pull-out efficiency and easy slippage failure under extreme wind conditions. In existing pile group foundation construction, in order to enhance overall stability, it is often necessary to connect the piles laterally underground. Traditional connection methods mostly rely on on-site welding or ordinary bolt fixing. However, welding in narrow and complex underground spaces is difficult to construct and the quality is hard to control. Existing wind power foundation civil construction often employs large-scale excavation or standard circular drilling methods. Large-scale excavation disrupts the stress of the original soil layer and consumes a large amount of concrete, while standard drilling has a single shape, making it difficult to adapt to complex irregular connecting components. This mismatch between the excavation method and the load-bearing components means that after the concrete is poured, the underground structure cannot form a precise three-dimensional interlocking interface with the surrounding soil. This results in insufficient bonding between the foundation structure and the stratum, making it impossible to effectively utilize the strength of the original soil and limiting the overall bearing capacity of the foundation. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide an installation foundation structure for wind power towers, which solves the problems of easy slippage and concrete cracking in traditional foundations, improves the stability of the installation foundation structure, ensures the continuous tightness of the connection between the main structures, enhances the shear resistance of the installation foundation structure, solves the problem of poor bonding between traditional foundations and the surrounding soil, makes full use of the strength of the original soil, and improves the overall bearing capacity of the installation foundation structure.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] An installation foundation structure for a wind power tower includes a base and a ground layer below the base. The ground layer below the base has a first pouring groove and a second pouring groove. Multiple main structures are installed at the outer end of the base. Each main structure includes a locking block. A first reinforcing device is installed in the middle of the locking block. A second reinforcing device is slidably connected to the middle of the first reinforcing device. The first pouring groove, the second pouring groove, and the base are all filled with concrete. The first reinforcement device includes a hollow tube body, with multiple slots opened on the outer side of the lower end of the hollow tube body, and an oblique groove opened on the outer side of the lower end of the hollow tube body at the upper end of the slots, and a retaining rope installed in the middle of the slots; The second reinforcement device includes a rod with a tray mounted at its bottom. Multiple insert plates are hinged to the upper end of the tray, and a slanted block is mounted on the upper end of the tray outside the insert plates. Multiple steel cables are installed between adjacent insert plates. The main structure and connecting devices form a concrete skeleton layer, and the ends of the second reinforcement device form a mesh structure, further increasing the contact area between the connecting devices and the underlying ground, thereby increasing the stability of the foundation.

[0006] Furthermore, multiple connecting devices are snapped between adjacent main structures. Each connecting device includes a connecting rod, with a housing installed at both ends. A first semi-circular ring, arranged in upper and lower layers, is installed at the end of each housing away from the connecting rod. A cylindrical block is installed at the end of each of the two first semi-circular rings away from the housing. A second semi-circular ring is rotatably connected to the outer side of each cylindrical block. A first helical rack is provided at the end of each second semi-circular ring away from the cylindrical block. A baffle is installed in the middle of the housing, and a V-shaped spring is installed in the middle of the baffle. A limit rod is rotatably connected in the middle of the housing, and a second helical rack is provided at the end of the limit rod away from the rotating end. A stop block is installed in the middle of the housing on the side of the limit rod away from the V-shaped spring. By setting up connecting devices to connect adjacent main structures, one-way self-locking is achieved using the ratchet principle. This not only enhances the lateral stiffness of the foundation group and improves shear resistance, but also avoids downhole welding operations, making construction convenient and the connection reliable.

[0007] Furthermore, the limiting rods are located between the V-shaped spring and the stop block, and the first and second helical racks engage in unidirectional meshing. The limiting rods, in conjunction with the V-shaped spring and the stop block, achieve precise unidirectional meshing between the first and second helical racks, facilitating the installation of the connecting device.

[0008] Furthermore, the length of the connecting rod can be adjusted, and the second semicircular ring is located between the two first semicircular rings. The adjustable length of the connecting rod allows the device to flexibly adapt to the deviation of the spacing between the main structures at the construction site; it reduces the installation accuracy requirements, facilitates operation in narrow underground spaces, and improves the overall construction efficiency.

[0009] Furthermore, the first pouring trough is adapted to the connecting device, and the second pouring trough is adapted to the main structure. By opening pouring troughs that are adapted to the shape of each device, the ineffective filling of concrete is reduced, and the integrity of the poured concrete and the stratum is enhanced.

[0010] Furthermore, the end of the insert plate away from the tray is wedge-shaped, and the side of the inclined block close to the insert plate is inclined. The wedge-shaped design of the insert plate, combined with the inclined guide of the inclined groove, reduces the resistance of the insert plate to penetrate the surrounding medium when it opens; ensuring smooth and reliable expansion action, allowing the insert plate to penetrate deeper into the stratum, thereby providing stronger grip and significantly improving the pull-out stability of the foundation.

[0011] Furthermore, the end of the insert plate furthest from the tray is limited in the middle of the slot, and the retaining rope can block and limit the end of the insert plate. The slot and the retaining rope provide double limitation for the end of the insert plate, effectively preventing the insert plate from shifting and falling off before expansion; ensuring the precise forming of the anchoring structure, ensuring that the steel cable can be accurately tightened to form a tension net, thereby ensuring the controllability of construction quality.

[0012] Furthermore, the locking block is fixed to the upper end of the base with bolts, and the first and second reinforcing devices penetrate the base and enter the second casting groove. The locking block is fixed by bolts and the main structure penetrates the base and extends into the groove, realizing a firm connection between the upper base and the deep anchor body, and improving the safety of the overall structure.

[0013] Furthermore, the main structure is distributed at equal angles along the center position in the middle of the base, and the insert plates are distributed at equal angles along the center position of the pole. The layout of the main structure and insert plates distributed at equal angles along the center ensures the uniformity of the force on the foundation in all directions, prevents tilting or settlement caused by stress concentration, and greatly improves the foundation's anti-overturning ability.

[0014] Furthermore, the first and second semicircular rings form circular holes that can be fitted onto the outside of the hollow tube, and the adjacent connecting devices are staggered on the outside of the main structure. The holes formed by the semicircular rings tightly fit the hollow tube, and with the staggered distribution of the connecting devices, a firm grip is achieved without damaging the tube, further enhancing the stability of the overall structure under complex stress.

[0015] Compared with the prior art, the advantages of this invention are: By combining the first reinforcement device, the second reinforcement device, the insert plate, and the steel cable in the second pouring trench, a solid anchoring structure with physical diameter expansion effect and internal tension network is constructed in the deep layer. This setting increases the contact area between the base and the underlying stratum, improves the physical blocking effect against upward pull-out force, solves the problems of easy slippage of traditional foundations and easy cracking of concrete, and improves the stability of the installation foundation structure. By utilizing the unidirectional meshing characteristics of the first and second helical racks inside the reinforcement device, a self-locking connection between adjacent main structures is achieved. This design avoids complex underground welding operations, ensures the continuous tightness of the connection between the main structures, and improves the shear resistance of the installation foundation structure. By utilizing the partitioned structure where the first pouring trench is adapted to the reinforcement device and the second pouring trench is adapted to the main structure, the underground space and the load-bearing components are precisely matched. This design reduces disturbance to the underlying strata and ineffective filling of concrete. By using concrete to wrap the components and fill the gaps to form a three-dimensional interlocking, it solves the problem of poor bonding between the traditional foundation and the surrounding soil, makes full use of the strength of the original soil, and improves the overall bearing capacity of the installed foundation structure. Attached Figure Description

[0016] Figure 1 This is a perspective view of the base and the underlying strata of the present invention; Figure 2 This is a perspective view of the base, main structure, and connecting device of the present invention; Figure 3 This is a perspective view of the main structure of the present invention; Figure 4 for Figure 3 A magnified view of part A; Figure 5 This is a partial perspective view of the first reinforcement device of the present invention; Figure 6 This is a partial perspective view of the second reinforcement device of the present invention; Figure 7 This is a partial perspective view of the main structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the connecting device of the present invention; Figure 9 This is a partial perspective view of the connecting device of the present invention; Figure 10 This is a schematic diagram illustrating the working principle of the connection device of the present invention; Figure 11 This is a three-dimensional axial view of the completed concrete pouring process according to the present invention. Figure 12 This is a bottom-view perspective view of the completed concrete pouring process of the present invention.

[0017] Explanation of the labels in the diagram: 1. Base; 2. Locking block; 3. First reinforcement device; 301. Hollow tube; 302. Locking groove; 303. Inclined groove; 304. Guard rope; 4. Second reinforcement device; 401. Rod; 402. Tray; 403. Insert plate; 404. Inclined block; 405. Steel cable; 5. Connecting device; 501. Connecting rod; 502. Shell; 503. First semi-circular ring; 504. Columnar block; 505. Second semi-circular ring; 506. First inclined rack; 507. Baffle; 508. V-shaped spring; 509. Limiting rod; 510. Second inclined rack; 511. Stop block; 6. Concrete; 7. Underlying stratum; 8. First pouring trench; 9. Second pouring trench. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within a compatible component. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example 1 This embodiment illustrates the structure of the device and its beneficial effects: Please see Figure 1-12An installation foundation structure for a wind power tower includes a base 1 and a ground layer 7 below the base 1. The ground layer 7 has a first pouring groove 8 and a second pouring groove 9. Multiple main structures are installed at the outer end of the base 1. The main structures include a locking block 2. A first reinforcing device 3 is installed in the middle of the locking block 2. A second reinforcing device 4 is slidably connected in the middle of the first reinforcing device 3. The first pouring groove 8, the second pouring groove 9 and the base 1 are all filled with concrete 6. The first reinforcement device 3 includes a hollow tube 301. Multiple slots 302 are provided on the outer side of the lower end of the hollow tube 301. An oblique groove 303 is provided on the outer side of the lower end of the hollow tube 301 at the upper end of the slots 302. A rope 304 is installed in the middle of the slots 302. The second reinforcement device 4 includes a rod 401, a tray 402 is installed at the bottom of the rod 401, a plurality of insert plates 403 are hinged to the upper end of the tray 402, an inclined block 404 is installed at the upper end of the tray 402 outside the insert plates 403, and a plurality of steel cables 405 are installed between adjacent insert plates 403.

[0022] Please see Figure 8-10 Multiple connecting devices 5 are snapped between adjacent main structures. Each connecting device 5 includes a connecting rod 501, with a housing 502 mounted at both ends of the connecting rod 501. At the end of the housing 502 away from the connecting rod 501, a first semi-circular ring 503, arranged in upper and lower layers, is mounted. At the ends of the two first semi-circular rings 503 away from the housing 502, a cylindrical block 504 is mounted. A second semi-circular ring 505 is rotatably connected to the outer side of the cylindrical block 504. At the end of the second semi-circular ring 505 away from the cylindrical block 504, a first helical rack 506 is provided. A [missing information - likely a component or part] is mounted in the middle of the housing 502. A baffle 507 has a V-shaped spring 508 installed in its center. A limit rod 509 is rotatably connected to the center of the housing 502. A second helical rack 510 is provided on the side of the limit rod 509 away from the rotating end. A stop block 511 is installed on the side of the housing 502 away from the V-shaped spring 508. Adjacent main structures are connected by a connecting device 5, and one-way self-locking is achieved using the ratchet principle. This not only enhances the lateral stiffness of the foundation group and improves its shear resistance, but also avoids downhole welding operations, making construction convenient and the connection reliable. The limit rod 509 is located between the V-shaped spring 508 and the stop block 511, and the first helical rack 506 and the second helical rack 510 engage unidirectionally. The limit rod 509, in conjunction with the V-shaped spring 508 and the stop block 511, achieves precise unidirectional engagement between the first helical rack 506 and the second helical rack 510, facilitating the installation of the connecting device 5.

[0023] Please see Figure 1-11The length of the connecting rod 501 is adjustable, and the second semicircular ring 505 is located between the two first semicircular rings 503. The adjustable length of the connecting rod 501 allows the device to flexibly adapt to deviations in the spacing of the main structure at the construction site; it reduces the installation accuracy requirements, facilitates operation in narrow underground spaces, and improves overall construction efficiency. The first pouring groove 8 is compatible with the connecting device 5, and the second pouring groove 9 is compatible with the main structure. By opening pouring grooves that are compatible with the shape of each device, the ineffective filling of concrete 6 is reduced, and the integrity of the poured concrete 6 with the stratum is enhanced. The end of the insert plate 403 away from the tray 402 is wedge-shaped, and the side of the inclined block 404 close to the insert plate 403 is inclined. The wedge-shaped design of the insert plate 403, combined with the inclined guide of the inclined groove 303, reduces the resistance of the insert plate 403 when it opens and penetrates the surrounding medium; it ensures smooth and reliable expansion action, allowing the insert plate 403 to penetrate deeper into the stratum, thereby providing stronger grip and significantly improving the pull-out stability of the foundation.

[0024] Please see Figure 1-7 The end of the insert plate 403 furthest from the tray 402 is limited in the middle of the slot 302, and the retaining rope 304 can block and limit the end of the insert plate 403. The slot 302 and the retaining rope 304 provide double limitation for the end of the insert plate 403, effectively preventing the insert plate 403 from shifting and falling off before expansion; ensuring the precise forming of the anchoring structure, ensuring that the steel cable 405 can be accurately tightened to form a tension net, thereby ensuring the controllability of construction quality. The clamping block 2 is fixed to the upper end of the base 1 by bolts, and the first reinforcing device 3 and the second reinforcing device 4 penetrate the base 1 and enter the second pouring groove 9. The clamping block 2 is fixed by bolts and the main structure penetrates the base and extends into the groove, realizing a firm connection between the upper base 1 and the deep anchoring body, improving the safety of the overall structure.

[0025] Please see Figure 4-9 The main structure is distributed at equal angles along the center of the base 1, and the insert plates 403 are distributed at equal angles along the center of the rod 401. This layout of the main structure and insert plates 403 at equal angles along the center ensures the uniformity of stress on the foundation in all directions, preventing tilting or settlement caused by stress concentration and greatly improving the foundation's overturning resistance. The first semicircular ring 503 and the second semicircular ring 505 form a circular hole that can be fitted onto the outside of the hollow tube 301. Adjacent connecting devices 5 are staggered on the outside of the main structure. The holes formed by the semicircular rings tightly fit the hollow tube 301. Combined with the staggered distribution of the connecting devices 5, a firm grip is achieved without damaging the tube, further enhancing the stability of the overall structure under complex stress.

[0026] Example 2 This embodiment illustrates the working principle of the device: During installation, after the base 1 is laid, a first pouring groove 8 and a second pouring groove 9 are respectively opened in the underlying stratum 7. Multiple main structures are installed at equal angles on the upper side of the base 1. The first reinforcing device 3 is fixed by the locking block 2. At the same time, the lower half of the main structure penetrates the base 1 and enters the middle of the second pouring groove 9 obliquely outward. The rod 401 is pulled outward along the hollow tube 301. During the movement, the rod 401 drives the insert plate 403 to move along the locking groove 302 and the oblique groove 303 through the tray 402. Driven by the groove 303, the insert plate 403 unfolds outward towards the pole 401. During the movement, the end of the insert plate 403 squeezes and breaks the retaining rope 304. Then, the end of the insert plate 403 is inserted into the soil layer of the lower stratum 7. During the process of the insert plate 403 unfolding outward towards the pole 401, the insert plate 403 drives the steel cable 405 to unfold. At this time, the bottom of the second reinforcement device 4 forms an umbrella-shaped structure and is inserted into the soil layer of the lower stratum 7. Then, the contact position between the pole 401 and the clamp 2 is welded to keep the main structure fixed. Using a clamp, the middle of the connecting rod 501 is clamped, and the connecting device 5 is moved directly above the first casting trough 8. At this time, both ends of the connecting device 5 are located on the upper side of the adjacent main structure, so that during the descent of the connecting device 5, the second semi-circular ring 505 is below the first semi-circular ring 503. When the second semi-circular ring 505 contacts the hollow tube 301, the hollow tube 301 causes the second semi-circular ring 505 to move towards the first semi-circular ring 503. At this time, the second helical rack 510 drives the limiting rod 509 to rotate towards the V-shaped spring 508. The second helical rack 510 does not limit the first helical rack 506 at this time. Under the action of inertia, the second semi-circular ring 505 rotates once around the cylindrical block 504 and then causes the first helical rack 506 to move again. The second helical rack 510 engages unidirectionally. At this time, the hollow tube 301 is located between the first semicircular ring 503 and the second semicircular ring 505. The V-shaped spring 508 pushes the limiting rod 509 so that the second helical rack 510 limits the unilateral movement of the first helical rack 506, so that the first semicircular ring 503 and the second semicircular ring 505 are sleeved on the outside of the hollow tube 301. If the inertial force of the second semicircular ring 505 is insufficient and it does not rotate one revolution along the cylindrical block 504, it can be pushed by the inner wall of the first casting groove 8 so that the first semicircular ring 503 and the second semicircular ring 505 sleeve the hollow tube 301. According to the connecting device 5 at different positions, different lengths of connecting rods 501 are selected so that multiple connecting devices 5 are staggered on the outside of adjacent main structures. Finally, concrete was poured on the outside of base 1, the first pouring trench 8, and the second pouring trench 9, completing the construction of the foundation installation structure under the wind turbine tower. This solves the problems of easy slippage and concrete cracking in traditional foundations, improving the stability of the installation foundation structure; ensures the continuous tightness of the connection between the main structures, enhancing the shear resistance of the installation foundation structure; and solves the problem of poor bonding between traditional foundations and the surrounding soil, fully utilizing the strength of the original soil and improving the overall load-bearing capacity of the installation foundation structure.

[0027] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An installation foundation structure for a wind power tower, comprising a base (1) and a ground layer (7) below the base (1), wherein the ground layer (7) has a first casting groove (8) and a second casting groove (9), characterized in that: Multiple main structures are installed on the outer end of the base (1). The main structure includes a locking block (2). A first reinforcing device (3) is installed in the middle of the locking block (2). A second reinforcing device (4) is slidably connected in the middle of the first reinforcing device (3). Concrete (6) is poured into the first pouring groove (8), the second pouring groove (9), and the base (1). The first reinforcing device (3) includes a hollow tube (301). Multiple locking slots (302) are opened on the outer side of the lower end of the hollow tube (301). 1) An inclined groove (303) is provided on the lower outer side of the slot (302) at the upper end, and a retaining rope (304) is installed in the middle of the slot (302); wherein, the second reinforcement device (4) includes a rod (401), a tray (402) is installed at the bottom of the rod (401), a plurality of insert plates (403) are hinged to the upper end of the tray (402), an inclined block (404) is installed on the upper end of the tray (402) outside the insert plate (403), and a plurality of steel cables (405) are installed between adjacent insert plates (403); Multiple connecting devices (5) are snapped between adjacent main structures. Each connecting device (5) includes a connecting rod (501). Both ends of the connecting rod (501) are fitted with housings (502). At the end of the housing (502) away from the connecting rod (501), a first semicircular ring (503) is installed, arranged in upper and lower layers. At the end of each of the two first semicircular rings (503) away from the housing (502), a cylindrical block (504) is installed. A second semicircular ring (505) is rotatably connected to the outside of the cylindrical block (504). A first helical rack (506) is provided at the end of the ring (505) away from the cylindrical block (504). A baffle (507) is installed in the middle of the housing (502). A V-shaped spring (508) is installed in the middle of the baffle (507). A limit rod (509) is rotatably connected in the middle of the housing (502). A second helical rack (510) is provided at the end of the limit rod (509) away from the rotating end. A stop block (511) is installed in the middle of the housing (502) on the side of the limit rod (509) away from the V-shaped spring (508). The limiting rod (509) is located between the V-shaped spring (508) and the stop (511), and the first helical rack (506) and the second helical rack (510) are engaged in one direction. The length of the connecting rod (501) can be adjusted, and the second semicircular ring (505) is located between the two first semicircular rings (503).

2. The installation foundation structure for a wind turbine tower according to claim 1, characterized in that: The first casting trough (8) is adapted to the connecting device (5), and the second casting trough (9) is adapted to the main structure.

3. The installation foundation structure for a wind turbine tower according to claim 1, characterized in that: The end of the insert plate (403) away from the tray (402) is wedge-shaped, and the side of the inclined block (404) close to the insert plate (403) is inclined.

4. The installation foundation structure for a wind turbine tower according to claim 1, characterized in that: The end of the insert plate (403) away from the tray (402) is limited in the middle of the slot (302), and the guide rope (304) can block and limit the end of the insert plate (403).

5. The installation foundation structure for a wind turbine tower according to claim 1, characterized in that: The card block (2) is fixed to the upper end of the base (1) by bolts, and the first reinforcing device (3) and the second reinforcing device (4) penetrate the base (1) and enter the second casting groove (9).

6. The installation foundation structure for a wind power tower according to claim 1, characterized in that: The main structure is distributed at equal angles along the center position in the middle of the base (1), and the insert plate (403) is distributed at equal angles along the center position of the rod (401).

7. The installation foundation structure for a wind turbine tower according to claim 1, characterized in that: The first semicircular ring (503) and the second semicircular ring (505) form a circular hole that can be fitted onto the outside of the hollow tube (301), and the adjacent connecting devices (5) are staggered on the outside of the main structure.

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