Module assembly type fan flexible tower prefabricated foundation and construction method

Abstract

The invention relates to the field of fan flexible tower foundations, and discloses a module assembly type fan flexible tower prefabricated foundation and a construction method, the module assembly type fan flexible tower prefabricated foundation comprises a plurality of foundation assemblies and an anchor bolt cage for fixing the plurality of foundation assemblies; the foundation assembly comprises beam-slab blocks and middle pier blocks combined with the beam-slab blocks, side splicing strips are fixed to one sides of the beam-slab blocks, side splicing grooves are formed in the other sides of the beam-slab blocks, every two adjacent beam-slab blocks are connected in a clamped mode through the corresponding side splicing strips and the corresponding side splicing grooves, center splicing grooves are formed in the beam-slab blocks in the direction of the central axis, and the center splicing grooves are connected with the beam-slab blocks in a clamped mode. A center splicing block is fixed to the middle pier module in the central axis direction, and the middle pier module is connected with the center splicing groove in a clamped mode through the center splicing block. A vibration buffering assembly for sensing vortex-induced vibration of the fan soft tower is arranged on the middle pier module; the prefabricated foundation is provided with the vibration buffering assembly, so that the influence of vortex-induced vibration generated by the fan soft tower on the installation stability of the foundation assembly can be reduced, and the connection stability of the prefabricated foundation assembly structure is kept.

Description

Technical Field

[0001] The invention relates to the field of wind turbine flexible tower foundations, and in particular to a modular assembled wind turbine flexible tower prefabricated foundation and a construction method. Background Art

[0002] In the wind turbine system, the wind turbine foundation is the key structure that bears the wind turbine's own weight and the wind load it is subjected to. It not only undertakes the important task of heavy-load support, but is also a key component of the project cost, and has a significant impact on the economic benefits of the overall project. Since the wind turbine is a tall structure, when it is subjected to horizontal wind loads, it will generate large horizontal forces and bottom bending moments. At the same time, the wind turbine unit is more sensitive to the inclination of the tower and uneven settlement of the foundation. Therefore, the wind turbine foundation must have a good ability to withstand vertical loads, horizontal loads, overturning moments, and vibrations or dynamic effects caused by the operation of the wind turbine.

[0003] At present, wind turbine foundations are mainly divided into cast-in-place gravity extension foundations and beam-slab foundations. Gravity extension foundations usually adopt a regular polygon or disc-shaped design. Although they have good integrity, the amount of concrete and steel bars used is relatively high. In contrast, the beam-slab foundation has optimized the amount of concrete used, but its construction process is relatively complicated.

[0004] In addition, the construction process of cast-in-place wind turbine foundation includes construction procedures such as foundation pit excavation, cushion pouring, anchor bolt installation, steel bar binding, concrete pouring, concrete curing, and earth backfilling. From the excavation of the foundation pit of the wind turbine to the conditions for tower installation, the entire process takes about 40 days. If there is extreme weather such as heavy rain, the pouring work may be interrupted, resulting in defects such as cold joints. During the on-site construction process, the construction quality of steel bar binding, concrete pouring and curing is uneven, making it difficult to guarantee the overall quality of foundation construction. In the severely cold northern regions, winter pouring construction faces many challenges, which further affects the construction quality.

[0005] Chinese patent CN105735338B discloses a prestressed assembled wind turbine foundation, which includes a foundation base, which is composed of prefabricated parts. The prefabricated parts include a center piece and an end piece, and the connection surface of the center piece and the end piece is provided with a through prestressed steel bar hole, which is connected by prestressed steel bars. Each surface around the center piece is provided with a groove, and the side of the end piece connection is provided with a convex groove. The base is connected to the upper wind turbine tower structure through a prestressed reinforced concrete ring rod, and a concrete secondary grouting hole is provided on the upper part of the center piece, which is connected to the ring rod through concrete secondary grouting.

[0006] The above-mentioned patent forms the foundation of the wind turbine by assembling a center piece, an end piece, and a counterweight block. It has the advantages of strong bending resistance, short installation time, high resource utilization, and no demolition waste. However, the vibration resistance of the assembled wind turbine flexible tower prefabricated foundation is limited, and the rigidity of the wind turbine flexible tower is low, which is prone to vortex-induced vibration and resonance. The vibration force transmitted to the combined prefabricated foundation will reduce the stability of the connection between the components, thereby affecting the safety of the wind turbine flexible tower. In addition, there is a lack of locking mechanism between the components of the combined wind turbine flexible tower prefabricated foundation, resulting in poor integrity of the assembled prefabricated foundation. Summary of the invention

[0007] In response to the above problems, a modular assembled wind turbine flexible tower prefabricated foundation and construction method are provided. The vibration damping component can effectively alleviate the vortex-induced vibration of the wind turbine flexible tower and maintain the stability of the connection between the foundation components. The vibration damping component addresses the problem that the wind turbine flexible tower has low stiffness and is prone to vortex-induced vibration and resonance. By reducing the vibration force transmitted to the prefabricated foundation, it avoids affecting the stability of the component connection, thereby ensuring the safe use of the wind turbine flexible tower.

[0008] To solve the problems of the prior art, the present invention provides a modular assembled wind turbine flexible tower prefabricated foundation, comprising a plurality of foundation components and an anchor cage for fixing the plurality of foundation components; the foundation component comprises a beam-slab assembly and a middle pier assembly assembled and installed with the beam-slab assembly, a side splicing strip is fixed on one side of the beam-slab assembly, a side splicing groove is provided on the other side of the beam-slab assembly, two adjacent beam-slab assemblies are connected by snapping together the side splicing strip and the side splicing groove, a center splicing groove is provided on the beam-slab assembly along the direction of the central axis, a center splicing block is fixed on the middle pier assembly along the direction of the central axis, and the middle pier assembly is snap-connected with the center splicing groove through the center splicing block; the anchor cage comprises an upper anchor plate snap-fitted and installed with the upper end face of the middle pier assembly, a lower anchor plate snap-fitted and installed with the lower end face of the middle pier assembly, and an anchor rod installed between the upper anchor plate and the lower anchor plate; a damping assembly for inducing vortex-induced vibration of the wind turbine flexible tower is provided on the middle pier assembly.

[0009] Preferably, the upper and lower end surfaces of the middle pier block are provided with sinking grooves, the upper anchor plate and the lower anchor plate are snap-fitted and installed in the sinking grooves, and the middle pier block is provided with anchor holes combined with anchor bolt rods; the bottoms of the middle pier block and the beam-slab block are provided with positioning straight grooves, and the bottom of the beam-slab block is provided with positioning arc grooves that are interconnected with the positioning straight grooves; a plurality of positioning straight plates are fixed on the lower anchor plate about its own axis circumference, and the positioning straight plates are snap-fitted and installed with the positioning straight grooves, and a positioning arc plate is fixedly installed on the positioning straight plate, and the positioning arc plate is snap-fitted and installed with the positioning arc grooves.

[0010] Preferably, the vibration damping component includes a protective cover fixed on the middle pier block, a sensing block is slidably installed in the protective cover, a sliding rod is fixedly connected to the sensing block, and the sliding rod is slidably installed on the middle pier block; a hollow column is fixedly installed on the middle pier block, two fixing rings are coaxially installed on the hollow column, two sleeves are slidably sleeved on the hollow column, and a vibration damping spring is connected between adjacent sleeves and fixing rings; a transmission mechanism for power transmission is provided between the sliding rod and the sleeve.

[0011] Preferably, the transmission mechanism includes a gear rotatably installed in the middle pier block, the gear is meshingly connected to two racks, the racks are connected to a fixed frame, and the fixed frame is fixedly installed on a sleeve; the gear is coaxially connected to a rotating drum, a curved groove is provided on the rotating drum, and a straight groove that is connected to the curved groove is also provided on the rotating drum, a sliding column is slidably connected in the curved groove, a hollow ring is fixedly installed on the sliding column, the hollow ring is coaxially sleeved on the outside of the rotating drum, and the hollow ring is fixedly connected to the sliding rod.

[0012] Preferably, the middle pier assembly block is provided with a clamping mechanism for reinforcing the prefabricated foundation and the wind turbine flexible tower assembly structure.

[0013] Preferably, the clamping mechanism comprises a clamping plate slidably connected along the axial direction of the arc surface of the middle pier assembly, a push rod is rotatably connected to the clamping plate, and the push rod is rotatably connected to the sleeve.

[0014] Preferably, the beam-slab assembly is provided with a reinforcement component for increasing the firmness of assembly with the middle pier assembly.

[0015] Preferably, the reinforcement assembly includes two guide rods fixed in the beam-slab block, and the guide rods are outer-arranged with a limit spring connected thereto; a cylindrical rod is slidably connected to the guide rod on one side of the beam-slab block, and a clamping column is slidably connected to the guide rod on the other side of the beam-slab block; a transverse sliding rod is fixedly connected to the clamping column and the cylindrical rod, and the clamping column and the cylindrical rod are both slidably connected to the beam-slab block; a rotating rod is rotatably connected to the beam-slab block, a sliding groove is provided on the rotating rod, and the transverse sliding rod is slidably connected to the sliding groove; a step groove is provided on the central splicing block, and the clamping column is clamped and connected to the step groove.

[0016] Preferably, a sliding sleeve is fixed in the middle pier block, an active rod is slidably connected in the sliding sleeve, a cam is coaxially connected to the rotating drum, a transmission rod is rotatably connected to the cam, and the transmission rod is rotatably connected to the active rod. A driven rod is fixedly installed on the clamping column, the driven rod is slidably connected to the beam and plate block, and the driven rod is arranged directly below the active rod.

[0017] The present invention also includes a construction method of a modular assembled wind turbine flexible tower prefabricated foundation, having the above-mentioned modular assembled wind turbine flexible tower prefabricated foundation, comprising the following steps:

[0018] S1. Assemble beam-slab modules and middle pier modules.

[0019] The beam-slab blocks and the middle pier blocks are installed by means of central splicing blocks and central splicing grooves, and structural adhesive is applied on the central splicing blocks to enhance the connection strength.

[0020] S2. Assemble multiple middle pier blocks.

[0021] The inner side of the middle pier block is in an arc-shaped structure, and the middle pier blocks are arranged in sequence along the circumferential direction so that multiple middle pier blocks form a closed circular structure. Adjacent beam and slab blocks are connected to each other through side splicing strips and side splicing grooves, and structural adhesive is applied on the side splicing strips to enhance the connection strength.

[0022] S3. Assemble the middle pier assembly and anchor cage.

[0023] The upper anchor plate in the anchor cage is mounted on the upper end face of the middle pier block, and the lower anchor plate is mounted on the lower end face of the middle pier block. The upper anchor plate and the lower anchor plate are connected to each other through anchor rods, and multiple middle pier blocks are stably assembled through upper and lower limit stops.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention is provided with a vibration-damping component, which can effectively alleviate the vortex-induced vibration of the wind turbine flexible tower and maintain the connection stability between the prefabricated foundation components. When the wind turbine flexible tower generates vortex-induced vibration and transmits it to the foundation component, the induction block of the vibration-damping component moves in the protective cover along with the vortex-induced vibration, and pushes the sleeve to slide smoothly on the hollow column through the transmission mechanism. The vibration-damping spring between the sleeve and the fixed ring provides elastic buffering, which effectively reduces the influence of the vibration force on the connection stability of the foundation component. At the same time, during the sliding process, the sleeve pushes the clamping plate to be tightly clamped on the outside of the wind turbine flexible tower through the push rod, and the installation stability of the wind turbine flexible tower is further improved through the enhanced clamping force, thereby ensuring the safety of the use of the wind turbine flexible tower.

[0026] 2. The present invention adopts an anchor cage to strengthen the connection between the foundation components. The anchor cage can firmly fix multiple middle pier blocks, and the positioning straight plate and positioning arc plate on the lower anchor plate are respectively connected to the beam-slab block and the middle pier block through a snap-fit ​​structure, thereby further enhancing the installation stability between the beam-slab block and the middle pier block.

[0027] 3. The present invention is provided with a reinforcement component, which can realize the automatic locking of the beam-slab block and the middle pier block. When the positioning arc plate is engaged with the beam-slab block for installation, the cylindrical rod in the beam-slab block will be squeezed and move upward. Then, the cylindrical rod accurately pushes the rotating rod to rotate through the transverse sliding rod. Under the transmission action of the rotating rod, the clamping column will be pushed to move downward and finally firmly engaged in a specific splicing structure, thereby completing the reinforcement locking of the beam-slab block and the middle pier block. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural diagram of the foundation components of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the beam-slab assembly of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the positioning arc plate of the modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the middle pier block of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0032] Figure 5 It is a three-dimensional structural diagram of a vibration-retarding component of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the side splicing strips of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0034] Figure 7 It is a three-dimensional structural diagram of the reinforcement components of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0035] Figure 8 It is a schematic diagram of the hollow column three-dimensional structure of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of the induction block of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of a sleeve of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0038] Fig.11 It is a schematic diagram of the three-dimensional structure of a vibration-reducing spring of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0039] Fig.12 It is a schematic diagram of the gear three-dimensional structure of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0040] Fig.13 It is a schematic diagram of the three-dimensional structure of a rotor of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0041] Fig.14 It is a schematic diagram of the cross-sectional structure of the middle pier block of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0042] Fig.15 It is a schematic diagram of the active rod three-dimensional structure of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0043] Fig.16 It is a schematic diagram of the three-dimensional structure of the clamping column of a modular assembled wind turbine flexible tower prefabricated foundation and construction method.

[0044] The numbers in the figure are:

[0045] 1. Foundation assembly; 11. Beam-slab assembly; 111. Positioning straight groove; 112. Positioning arc groove; 12. Middle pier assembly; 121. Sinking groove; 122. Anchor hole; 13. Side splicing strip; 14. Side splicing groove; 15. Center splicing block; 16. Center splicing groove; 2. Anchor cage; 21. Upper anchor plate; 22. Lower anchor plate; 221. Positioning straight plate; 222. Positioning arc plate; 23. Anchor rod; 3. Vibration damping assembly; 31. Protective cover; 32. Induction block; 33. Sliding rod; 34. Hollow column; 35. Fixing ring; 36. Sleeve; 37. Vibration damping Spring; 38. Transmission mechanism; 381. Gear; 382. Rack; 383. Fixed frame; 384. Rotating drum; 385. Curved groove; 386. Straight groove; 387. Sliding column; 388. Hollow ring; 39. Clamping mechanism; 391. Clamping plate; 392. Push rod; 4. Reinforcement assembly; 41. Guide rod; 42. Limit spring; 43. Cylindrical rod; 44. Clamping column; 45. Transverse sliding rod; 46. Rotating rod; 47. Sliding groove; 48. Step groove; 51. Sliding sleeve; 52. Active rod; 53. Cam; 54. Transmission rod; 55. Follower rod. DETAILED DESCRIPTION

[0046] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0047] See also Figure 1-Figure 6As shown, a modular assembled wind turbine flexible tower prefabricated foundation includes a plurality of foundation components 1 and an anchor cage 2 for fixing the plurality of foundation components 1; the foundation component 1 includes a beam-slab assembly 11 and a middle pier assembly 12 assembled and installed with the beam-slab assembly 11, a side splicing strip 13 is fixed on one side of the beam-slab assembly 11, and a side splicing groove 14 is opened on the other side of the beam-slab assembly 11, and two adjacent beam-slab assembly 11 are connected by the side splicing strip 13 and the side splicing groove 14, and the beam-slab assembly 11 is connected along the central axis direction. A central splicing groove 16 is opened, a central splicing block 15 is fixed on the middle pier assembly 12 along the central axis direction, and the middle pier assembly 12 is engaged with the central splicing groove 16 through the central splicing block 15; the anchor cage 2 includes an upper anchor plate 21 engaged with the upper end surface of the middle pier assembly 12, a lower anchor plate 22 engaged with the lower end surface of the middle pier assembly 12, and an anchor rod 23 installed between the upper anchor plate 21 and the lower anchor plate 22; the middle pier assembly 12 is provided with a vibration-reducing component 3 for inducing the vortex-induced vibration of the wind turbine soft tower.

[0048] The beam-slab assembly 11 is precisely mounted on the side of the middle pier assembly 12 through the central splicing block 15 and the central splicing groove 16. The inner side surface of the middle pier assembly 12 is designed as an arc-shaped structure, so that multiple middle pier blocks 12 can be arranged in order along the circumferential direction of the arc, and finally closed to form a complete circumferential structure. Subsequently, the anchor cage 2 is installed at the connecting part of the middle pier assembly 12. Through its strong fastening force, multiple middle pier blocks 12 can be stably combined, thereby forming a stable and reliable prefabricated foundation.

[0049] After the combined prefabricated foundation is installed at the designated location and put into use, the vortex-induced vibration generated by the wind turbine flexible tower during operation will be transmitted to the foundation component 1. At this time, the vibration-reducing component 3 on the middle pier block 12 effectively absorbs and disperses part of the vortex-induced vibration energy through its buffering mechanism, thereby significantly reducing the impact and influence of the vibration force on the combined prefabricated foundation, ensuring the stability and safety of the entire structure.

[0050] See also Figure 1-Figure 6 As shown, the upper and lower end surfaces of the middle pier block 12 are both provided with a sinking groove 121, the upper anchor plate 21 and the lower anchor plate 22 are snap-fitted and installed in the sinking groove 121, and the middle pier block 12 is provided with an anchor hole 122 combined with the anchor rod 23; the bottoms of the middle pier block 12 and the beam-slab block 11 are both provided with a positioning straight groove 111, and the bottom of the beam-slab block 11 is provided with a positioning arc groove 112 that is mutually interpenetrating with the positioning straight groove 111; a plurality of positioning straight plates 221 are fixed on the lower anchor plate 22 about its own axis circumference, and the positioning straight plates 221 are snap-fitted and installed with the positioning straight groove 111, and a positioning arc plate 222 is fixedly installed on the positioning straight plate 221, and the positioning arc plate 222 is snap-fitted and installed with the positioning arc groove 112.

[0051] After a plurality of middle pier blocks 12 are combined in a predetermined manner, the upper anchor plate 21 and the lower anchor plate 22 are respectively engaged and installed in the sinking grooves 121 on the upper and lower end surfaces of the middle pier block 12, and then the anchor rod 23 is connected between the upper anchor plate 21 and the lower anchor plate 22 to strengthen the connection of the middle pier block 12.

[0052] When the lower anchor plate 22 is installed under the middle pier block 12, the positioning straight plate 221 on the lower anchor plate 22 is snap-connected with the positioning straight groove 111 at the bottom of the middle pier block 12 and the bottom of the beam-slab block 11, and the positioning arc plate 222 is snap-fitted and installed in the positioning arc groove 112 at the bottom of the beam-slab block 11. The snap-fit ​​structure can further enhance the stability and reliability of the assembly between the beam-slab block 11, the middle pier block 12 and the anchor cage 2.

[0053] See also Figure 4-Figure 13 As shown, the vibration damping component 3 includes a protective cover 31 fixed on the middle pier block 12, a sensing block 32 is slidably installed in the protective cover 31, a sliding rod 33 is fixedly connected to the sensing block 32, and the sliding rod 33 is slidably installed on the middle pier block 12; a hollow column 34 is fixedly installed on the middle pier block 12, two fixing rings 35 are coaxially installed on the hollow column 34, two sleeves 36 are slidably sleeved on the hollow column 34, and a vibration damping spring 37 is connected between adjacent sleeves 36 and fixing rings 35; a transmission mechanism 38 for power transmission is provided between the sliding rod 33 and the sleeve 36.

[0054] The vortex-induced vibration generated by the flexible tower of the wind turbine will be partially transmitted to the sensing block 32. The sensing block 32 slides in the protective cover 31 under the influence of the vibration force. The sensing block 32 drives the sliding rod 33 below to move synchronously. The sliding rod 33 transmits the vibration energy to the sleeve 36 through the transmission mechanism 38. Under the action of the transmission mechanism 38, the two sleeves 36 on the hollow column 34 move in opposite directions. The damping spring 37 between the sleeve 36 and the fixing ring 35 is elastically stretched or compressed. Under the elastic buffering of the damping spring 37, the influence of the vortex-induced vibration of the flexible tower of the wind turbine on the stability of the prefabricated foundation assembly structure can be reduced.

[0055] See also Figure 9-13 As shown, the transmission mechanism 38 includes a gear 381 rotatably installed in the middle pier block 12, the gear 381 is meshingly connected with two racks 382, ​​the racks 382 are connected with a fixing frame 383, and the fixing frame 383 is fixedly installed on the sleeve 36; the gear 381 is coaxially connected with a rotating cylinder 384, the rotating cylinder 384 is provided with a curved groove 385, and the rotating cylinder 384 is also provided with a straight groove 386 that is connected with the curved groove 385, and a sliding column 387 is slidably connected in the curved groove 385, and a hollow ring 388 is fixedly installed on the sliding column 387, and the hollow ring 388 is coaxially sleeved on the outside of the rotating cylinder 384, and the hollow ring 388 is fixedly connected to the sliding rod 33.

[0056] When the sliding rod 33 moves, it drives the hollow ring 388 to move synchronously. The hollow ring 388 pushes the sliding column 387 to slide along the track of the curved groove 385. When the sliding column 387 moves, it can push the rotating cylinder 384 to rotate. The gear 381 is meshed with the rack 382. Through the meshing transmission of the gear 381 and the rack 382, ​​the rack 382 is controlled to move in opposite directions on both sides of the gear 381. The rack 382 is fixedly connected to the sleeve 36 through the fixing frame 383. The movement of the rack 382 can drive the sleeve 36 to move synchronously, thereby realizing the movement of the sleeve 36 outside the hollow column 34.

[0057] See also Figure 7 , Fig. 9 and Fig.11 As shown, the middle pier assembly block 12 is provided with a clamping mechanism 39 for reinforcing the prefabricated foundation and the wind turbine flexible tower assembly structure.

[0058] Part of the vibration energy of the vortex-induced vibration of the wind turbine flexible tower is transmitted to the vibration damping component 3, so that the sleeve 36 in the vibration damping component 3 can slide outside the hollow column 34. The movement of the sleeve 36 triggers the action of the clamping mechanism 39, so that it is clamped on the outside of the wind turbine flexible tower, thereby keeping the installation of the wind turbine flexible tower stable, and further reducing the influence of the vortex-induced vibration of the wind turbine flexible tower on the stability of the prefabricated foundation assembly structure.

[0059] See also Figure 7 , Fig. 9 and Fig.11 As shown, the clamping mechanism 39 includes a clamping piece 391 slidably connected along the axial direction of the arc surface of the middle pier assembly 12 , a push rod 392 is rotatably connected to the clamping piece 391 , and the push rod 392 is rotatably connected to the sleeve 36 .

[0060] When the sleeve 36 slides on the hollow column 34, the push rod 392 connected between the sleeve 36 and the clamping plate 391 rotates around its connection point, and the rotating push rod 392 pushes the clamping plate 391 to slide along the arc axis direction of the middle pier assembly 12, so that the clamping plate 391 moves and clamps on the outside of the wind turbine flexible tower.

[0061] See also Figure 14-16 As shown, the beam-slab assembly 11 is provided with a reinforcing component 4 for increasing the firmness of assembly with the middle pier assembly 12 .

[0062] When assembling the beam-slab assembly 11, the middle pier assembly 12 and the anchor cage 2, the reinforcement assembly 4 can autonomously lock the beam-slab assembly 11 and the middle pier assembly 12 to maintain the stability of the prefabricated foundation assembly.

[0063] See also Figure 14-16As shown, the reinforcement component 4 includes two guide rods 41 fixed in the beam-slab block 11, and the guide rods 41 are provided with limit springs 42. A cylindrical rod 43 is slidably connected to the guide rod 41 on one side of the beam-slab block 11, and a clamping column 44 is slidably connected to the guide rod 41 on the other side of the beam-slab block 11. A transverse sliding rod 45 is fixedly connected to the clamping column 44 and the cylindrical rod 43, and the clamping column 44 and the cylindrical rod 43 are both slidably connected to the beam-slab block 11; a rotating rod 46 is rotatably connected in the beam-slab block 11, and a sliding groove 47 is provided on the rotating rod 46, and the transverse sliding rod 45 is slidably connected to the sliding groove 47; a step groove 48 is provided on the central splicing block 15, and the clamping column 44 is engaged and connected with the step groove 48.

[0064] When the positioning arc plate 222 on the outer side of the lower anchor plate 22 is engaged and installed in the positioning arc groove 112 at the bottom of the beam-slab assembly 11, the upward movement of the positioning arc plate 22 causes it to squeeze the cylindrical rod 43. The cylindrical rod 43 is subjected to the squeezing force and moves upward along the direction of the guide rod 41. At the same time, the upward movement of the cylindrical rod 43 drives the synchronous movement of the horizontal slide bar 45 connected to it. The horizontal slide bar 45 slides in the slide groove 47 on one side of the rotating rod 46, thereby pushing the rotating rod 46 in contact with the slide groove 47 to rotate. The rotating rod 46 rotates and pushes the clamping column 44 to move down and engage into the step groove 48 inside the central splicing block 15. The clamping structure of the clamping column 44 and the step groove 48 realizes the autonomous locking between the beam-slab assembly 11 and the middle pier assembly 12, thereby improving the stability of the prefabricated foundation assembly.

[0065] See also Fig.15 and Fig.16 As shown, a sliding sleeve 51 is fixed in the middle pier assembly 12, and an active rod 52 is slidably connected in the sliding sleeve 51; a cam 53 is coaxially connected to the rotating drum 384, and a transmission rod 54 is rotatably connected to the cam 53, and the transmission rod 54 is rotatably connected to the active rod 52. A driven rod 55 is fixedly installed on the clamping column 44, and the driven rod 55 is slidably connected to the beam and plate assembly 11, and the driven rod 55 is arranged directly below the active rod 52.

[0066] When the vortex-induced vibration generated by the flexible tower of the wind turbine affects the stability of the assembled installation of the foundation component 1, the induction block 32 in the vibration damping component 3 senses part of the vibration force and triggers the rotating drum 384 to rotate. The rotating drum 384 drives the cam 53 to rotate synchronously. The transmission rod 54 rotates with the rotation of the cam 53, thereby pushing the active rod 52 to move downward, so that the active rod 52 moves downward to squeeze the driven rod 55. The downward movement of the driven rod 55 drives the clamping column 44 to move downward synchronously, so that the clamping column 44 is clamped and installed in the step groove 48. The part of the clamping column 44 that contacts the step groove 48 is designed as a frustum-shaped structure. The extrusion of the inclined surface of the clamping column 44 and the step groove 48 can strengthen the connection between the beam-slab assembly 11 and the middle pier assembly 12, thereby enhancing the connection stability between the loosened beam-slab assembly 11 and the middle pier assembly 12.

[0067] The present invention also includes a construction method of a modular assembled wind turbine flexible tower prefabricated foundation, having the above-mentioned modular assembled wind turbine flexible tower prefabricated foundation, comprising the following steps:

[0068] S1. Assemble the beam-slab assembly 11 and the middle pier assembly 12.

[0069] The beam-slab assembly 11 and the middle pier assembly 12 are mounted by means of a central splicing block 15 and a central splicing groove 16 , and structural adhesive is applied to the central splicing block 15 to enhance the connection strength.

[0070] S2, assembling a plurality of middle pier blocks 12.

[0071] The inner side of the middle pier block 12 is an arc-shaped structure, and the middle pier blocks 12 are arranged in sequence along the circumferential direction so that multiple middle pier blocks 12 form a closed circular structure. Adjacent beam-slab blocks 11 are mutually engaged and connected through side splicing strips 13 and side splicing grooves 14, and structural adhesive is applied on the side splicing strips 13 to enhance the connection strength.

[0072] S3, assembling the middle pier assembly block 12 and the anchor cage 2.

[0073] The upper anchor plate 21 in the anchor cage 2 is mounted on the upper end surface of the middle pier block 12, and the lower anchor plate 22 is mounted on the lower end surface of the middle pier block 12. The upper anchor plate 21 and the lower anchor plate 22 are connected to each other through the anchor rod 23, and multiple middle pier blocks 12 are stably assembled through upper and lower limit stops.

[0074] Working principle: first assemble the beam-slab assembly 11 and the middle pier assembly 12 through the side splicing strips 13 and the side splicing grooves 14, and arrange multiple middle pier blocks 12 in sequence along the circumferential direction of the inner arc of the middle pier block 12, then snap-fit ​​and install the upper anchor plate 21 in the sinking groove 121 at the upper end of the middle pier block 12, snap-fit ​​and install the lower anchor plate 22 in the sinking groove 121 at the lower end of the middle pier block 12, and then connect and fix the anchor rod 23 between the upper anchor plate 21 and the lower anchor plate 22, so as to combine multiple middle pier blocks 12 together to realize the assembly of prefabricated foundation.

[0075] The positioning straight plate 221 on the lower anchor plate 22 is snap-fitted and installed at the corresponding position of the bottom of the beam-slab block 11 and the middle pier block 12, and the positioning arc plate 222 is snap-fitted and installed at the bottom of the beam-slab block 11. The snap-fit ​​structure further enhances the combined stability of the beam-slab block 11 and the middle pier block 12. The positioning arc plate 222 squeezes the cylindrical rod 43 in the beam-slab block 11, so that the cylindrical rod 43 moves upward, and the transverse sliding rod 45 next to the cylindrical rod 43 pushes the rotating rod 46 to rotate. The rotating rotating rod 46 pushes the clamping column 44 on the other side of the beam-slab block 11 to move downward, so that the clamping column 44 is snap-fitted into the step groove 48 in the central splicing block 15, thereby autonomously locking the assembly of the beam-slab block 11 and the middle pier block 12.

[0076] The vortex-induced vibration generated when the wind turbine flexible tower is in use is transmitted to the induction block 32, so that the induction block 32 slides in the protective cover 31, and the induction block 32 drives the sliding rod 33 and the hollow ring 388 below to move synchronously, and the hollow ring 388 pushes the sliding column 387 to slide in the curved groove 385. At this time, the rotating cylinder 384 is rotated by the thrust of the sliding column 387, and the rotating cylinder 384 drives the gear 381 to rotate synchronously. The gear 381 controls the movement of the rack 382 on the side through meshing transmission, and the rack 382 controls the synchronous movement of the fixed frame 383 and the sleeve 36, pushing the sleeve 36 to slide on the hollow column 34. The damping spring 37 connected between the sleeve 36 and the fixing ring 35 is elastically adjusted. The damping spring 37 can buffer part of the vibration force and reduce the influence of the vortex-induced vibration on the prefabricated foundation assembly structure.

[0077] When the sleeve 36 slides, the push rod 392 connected between the sleeve 36 and the clamping plate 391 rotates with its connection point as the center, and the rotating push rod 392 pushes the clamping plate 391 to move toward the direction close to the wind turbine flexible tower. The clamping plate 391 is clamped on the outside of the wind turbine flexible tower, thereby enhancing the resistance of the prefabricated foundation assembly structure to the vibration force of the wind turbine flexible tower.

[0078] When rotating, the rotating drum 384 drives the cam 53 to rotate synchronously, and the transmission rod 54 connected between the cam 53 and the active rod 52 rotates with its connection point as the center. The rotating transmission rod 54 pushes the active rod 52 to slide in the sliding sleeve 51, and the active rod 52 moves downward to contact the driven rod 55 and generate pressure, pushing the driven rod 55 and the clamping column 44 to move downward, so that the clamping column 44 is pressed tightly in the step groove 48. In this way, the beam and slab assembly 11 and the middle pier assembly 12 that are loosened due to the vibration force can be stably combined again, further reducing the influence of the vortex-induced vibration of the wind turbine soft tower on the assembly stability of the foundation component 1.

[0079] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A modular assembled wind turbine flexible tower prefabricated foundation, characterized by: It comprises a plurality of basic components (1) and an anchor cage (2) for fixing the plurality of basic components (1); The foundation assembly (1) comprises a beam-slab assembly (11) and a middle pier assembly (12) assembled and installed with the beam-slab assembly (11); a side splicing strip (13) is fixed on one side of the beam-slab assembly (11); a side splicing groove (14) is provided on the other side of the beam-slab assembly (11); two adjacent beam-slab assembly (11) are connected by snapping together the side splicing strip (13) and the side splicing groove (14); a center splicing groove (16) is provided on the beam-slab assembly (11) along the center axis direction; a center splicing block (15) is fixed on the middle pier assembly (12) along the center axis direction; and the middle pier assembly (12) is connected by snapping together the center splicing block (15) and the center splicing groove (16); The anchor cage (2) comprises an upper anchor plate (21) mounted in engagement with the upper end surface of the middle pier assembly (12), a lower anchor plate (22) mounted in engagement with the lower end surface of the middle pier assembly (12), and an anchor rod (23) mounted between the upper anchor plate (21) and the lower anchor plate (22); The middle pier assembly (12) is provided with a vibration-retarding component (3) for inducing vortex-induced vibration of the fan flexible tower.

2. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 1 is characterized by: The upper and lower end surfaces of the middle pier assembly block (12) are both provided with a sinking groove (121), the upper anchor plate (21) and the lower anchor plate (22) are snap-fitted and installed in the sinking groove (121), and the middle pier assembly block (12) is provided with an anchor hole (122) in combination with the anchor rod (23); The bottoms of the middle pier block (12) and the beam-slab block (11) are both provided with positioning straight grooves (111), and the bottom of the beam-slab block (11) is provided with positioning arc grooves (112) that interpenetrate the positioning straight grooves (111); A plurality of positioning straight plates (221) are fixed on the lower anchor plate (22) about its own axis circumference, and the positioning straight plates (221) are mounted in engagement with the positioning straight grooves (111), and a positioning arc plate (222) is fixedly mounted on the positioning straight plate (221), and the positioning arc plate (222) is mounted in engagement with the positioning arc grooves (112).

3. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 1 is characterized by: The vibration damping component (3) comprises a protective cover (31) fixed on the middle pier assembly block (12), a sensing block (32) is slidably mounted in the protective cover (31), a sliding rod (33) is fixedly connected to the sensing block (32), and the sliding rod (33) is slidably mounted on the middle pier assembly block (12); A hollow column (34) is fixedly mounted on the middle pier assembly (12), two fixing rings (35) are coaxially mounted on the hollow column (34), two sleeves (36) are slidably sleeved on the hollow column (34), and a damping spring (37) is connected between adjacent sleeves (36) and fixing rings (35); A transmission mechanism (38) for power transmission is provided between the sliding rod (33) and the sleeve (36).

4. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 3 is characterized by: The transmission mechanism (38) comprises a gear (381) rotatably mounted in the middle pier assembly (12), the gear (381) is meshingly connected with two racks (382), the racks (382) are connected with a fixing frame (383), and the fixing frame (383) is fixedly mounted on the sleeve (36); The gear (381) is coaxially connected to a rotating cylinder (384), a curved groove (385) is provided on the rotating cylinder (384), a straight groove (386) which is connected to the curved groove (385) is also provided on the rotating cylinder (384), a sliding column (387) is slidably connected in the curved groove (385), a hollow ring (388) is fixedly installed on the sliding column (387), the hollow ring (388) is coaxially sleeved on the outside of the rotating cylinder (384), and the hollow ring (388) is fixedly connected to the sliding rod (33).

5. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 4 is characterized by: The middle pier assembly block (12) is provided with a clamping mechanism (39) for reinforcing the prefabricated foundation and the wind turbine flexible tower assembly structure.

6. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 5, characterized in that: The clamping mechanism (39) comprises a clamping piece (391) slidably connected along the axial direction of the arc surface of the middle pier assembly (12); a push rod (392) is rotatably connected to the clamping piece (391); and the push rod (392) is rotatably connected to the sleeve (36).

7. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 1, characterized in that: The beam-slab assembly (11) is provided with a reinforcing component (4) for increasing the firmness of assembly with the middle pier assembly (12).

8. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 7, characterized in that: The reinforcement assembly (4) comprises two guide rods (41) fixed in the beam-slab assembly (11); a limit spring (42) is disposed on the outer surface of the guide rods (41); a cylindrical rod (43) is slidably connected to the guide rod (41) on one side of the beam-slab assembly (11); a clamping column (44) is slidably connected to the guide rod (41) on the other side of the beam-slab assembly (11); a transverse sliding rod (45) is fixedly connected to the clamping column (44) and the cylindrical rod (43); and the clamping column (44) and the cylindrical rod (43) are both slidably connected to the beam-slab assembly (11); A rotating rod (46) is rotatably connected in the beam-slab assembly block (11), a sliding groove (47) is provided on the rotating rod (46), and a transverse sliding rod (45) is slidably connected to the sliding groove (47); A step groove (48) is provided on the central splicing block (15), and the clamping column (44) is clamped and connected with the step groove (48).

9. The modular assembled wind turbine flexible tower prefabricated foundation according to claim 8, characterized in that: A sliding sleeve (51) is fixed in the middle pier assembly block (12), and an active rod (52) is slidably connected in the sliding sleeve (51); A cam (53) is coaxially connected to the rotating drum (384), a transmission rod (54) is rotatably connected to the cam (53), and the transmission rod (54) is rotatably connected to the active rod (52); A driven rod (55) is fixedly mounted on the clamping column (44), the driven rod (55) is slidably connected to the beam-slab assembly block (11), and the driven rod (55) is arranged at a position directly below the active rod (52).

10. A construction method for a modular assembled wind turbine flexible tower prefabricated foundation, characterized in that: A modular assembled wind turbine flexible tower prefabricated foundation as described in any one of claims 1 to 9 comprises the following steps: S1, assembling the beam and slab assembly (11) and the middle pier assembly (12); The beam-slab assembly (11) and the middle pier assembly (12) are mounted by means of a central splicing block (15) and a central splicing groove (16), and structural adhesive is applied to the central splicing block (15) to enhance the connection strength; S2, assembling a plurality of middle pier blocks (12); The inner side of the middle pier block (12) is in an arc-shaped structure, and the middle pier blocks (12) are arranged in sequence along the circumferential direction so that a plurality of middle pier blocks (12) form a closed circumferential structure, and adjacent beam and slab blocks (11) are mutually engaged and connected through side splicing strips (13) and side splicing grooves (14), and structural adhesive is applied on the side splicing strips (13) to enhance the connection strength; S3, assembling the middle pier assembly block (12) and the anchor cage (2); The upper anchor plate (21) in the anchor cage (2) is mounted in engagement with the upper end surface of the middle pier assembly (12), and the lower anchor plate (22) is mounted in engagement with the lower end surface of the middle pier assembly (12). The upper anchor plate (21) and the lower anchor plate (22) are connected to each other via an anchor rod (23), and a plurality of middle pier assemblies (12) are stably assembled by upper and lower limit stops.

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