An assembled prefabricated wind turbine tower foundation and construction method thereof

Abstract

The present invention discloses an assembled prefabricated wind turbine tower foundation and a construction method thereof. The device includes multiple tower foundation prefabricated units, each of which includes a tower foundation connecting portion and a tower foundation supporting portion. The tower foundation supporting portion is a frame structure, and the splicing side of the tower foundation connecting portion is provided with multiple arc-shaped steel bars. Two adjacent tower foundation supporting portions are tied and fixed by steel strands. The method includes the following steps: 1. Determine the number of tower foundation prefabricated units; 2. Prefabricate the tower foundation prefabricated units in a factory; 3. Transport the prefabricated tower foundation prefabricated units to the construction site; 4. Locate the positions of multiple tower foundation prefabricated units at the construction site; 5. Assemble the tower foundation with the help of steel strands; 6. Pouring concrete. The present invention has a reasonable structural design and a simple construction method. It can effectively reduce redundant material filling, significantly reduce deadweight, reduce the difficulty of transportation and hoisting, and achieve rapid installation and disassembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to an assembled prefabricated wind power tower foundation and a construction method thereof. Background Art

[0002] In wind power project construction, the construction quality and efficiency of wind turbine tower foundations play a critical role in the stability and economic viability of the entire wind power system. Traditional wind turbine tower foundations typically utilize cast-in-place concrete structures or prefabricated structures. However, cast-in-place construction presents challenges such as long construction periods and significant susceptibility to weather and other environmental factors. This is particularly true in remote areas with complex geological conditions or harsh climates, where pouring and maintenance become even more difficult. Prefabricated structures, however, are bulky and heavy, leading to high transportation and hoisting costs, often limited by road conditions and the capacity of lifting equipment.

[0003] In existing technologies, some wind turbine foundations are prefabricated in blocks. However, these blocks are mostly solid or simple hollow designs, which still present problems such as heavy weight, complex connections, insufficient overall rigidity, and difficulty in precise positioning. Therefore, a prefabricated wind turbine tower foundation and its construction method are needed that can reduce the difficulty of transportation and lifting while ensuring structural stability and ease of construction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an assembled prefabricated wind turbine tower foundation in response to the deficiencies in the above-mentioned prior art. The foundation has a reasonable structural design and a simple construction method. By designing the tower foundation prefabricated unit as a frame structure, it can effectively reduce redundant material filling, greatly reduce the dead weight compared to the solid structure, reduce the difficulty of transportation and lifting, save costs, and use steel strands to tie adjacent tower foundation prefabricated units, which can effectively avoid stress concentration, thereby effectively enhancing the integrity and stability of the entire wind turbine tower foundation. It can be removed as a whole during disassembly, achieving rapid installation and disassembly, and can be reused.

[0005] To solve the above technical problems, the present invention adopts a technical solution: an assembled prefabricated wind turbine tower foundation, comprising a plurality of tower foundation prefabricated units with fan-shaped cross sections, wherein the plurality of tower foundation prefabricated units are sequentially spliced to form an assembled prefabricated wind turbine tower foundation with a ring-shaped cross section;

[0006] Each of the tower foundation prefabricated units includes a tower foundation connection portion as a fan-shaped inner arc and a tower foundation support portion connected to the tower foundation connection portion, a plurality of the tower foundation connection portions are hooped together by stirrups to form a hollow cylindrical structure, and after the column steel bars are tied in the cylindrical structure and concrete is poured, a circular column for tower connection is formed, and the tower foundation support portion is a frame structure, and the splicing side of each of the tower foundation connection portions is provided with a semicircular hole for burying the connecting steel bars, and a plurality of arc steel bars are provided in each of the semicircular holes from top to bottom, and an arc-shaped embedded steel plate is provided on the side of the tower foundation connection portion away from the tower foundation support portion, and the arc-shaped embedded steel plate is anchored to the surface of the tower foundation connection portion by an anchor bar hook, two adjacent arc-shaped embedded steel plates are welded, and two adjacent tower foundation support portions are fixed by being tied with steel strands;

[0007] The tower foundation connection portion is arranged higher than the tower foundation support portion, and the top of the tower foundation support portion gradually slopes downward from an end close to the tower foundation connection portion to an end away from the tower foundation connection portion.

[0008] Furthermore, a stirrup clamping groove for clamping stirrups is provided on the outer arc surface of the tower foundation connecting portion extending above the tower foundation supporting portion.

[0009] Furthermore, the arc-shaped steel bars between the adjacent tower foundation connection parts are arranged in an alternating manner to form a steel bar insertion channel for inserting the connecting steel bars;

[0010] The connecting steel bars are embedded in the semicircular holes through concrete and are located in the steel bar insertion channel.

[0011] Furthermore, the tower foundation connecting portion and the tower foundation supporting portion are both reinforced concrete components and are integrally formed.

[0012] Furthermore, the tower base support part includes two right-angled trapezoidal side panels symmetrically connected on both sides of the tower base connection part, and the ends of the two right-angled trapezoidal side panels away from the tower base connection part are connected to arc-shaped end plates, and the first transverse stiffening rib and the second transverse stiffening rib are also connected between the two right-angled trapezoidal side panels.

[0013] Furthermore, two drainage holes are reserved on the arc-shaped end plate.

[0014] Furthermore, a first steel strand perforation group and a second steel strand perforation group are reserved on the right-angled trapezoidal side plate, the first steel strand perforation group is arranged close to the tower base connection portion, and the second steel strand perforation group is arranged close to the arc-shaped end plate;

[0015] The plurality of steel strand perforations in the first steel strand perforation group are arranged in a hexagonal star shape, and the plurality of steel strand perforations in the second steel strand perforation group are arranged in a triangle shape.

[0016] On the other hand, the present invention also discloses a construction method of an assembled prefabricated wind turbine tower foundation, which comprises the following steps:

[0017] Step 1: Determine the number of tower foundation prefabricated units: Determine the number, size, and weight of tower foundation prefabricated units based on the design dimensions of the prefabricated wind turbine tower foundation, as well as transportation and hoisting conditions;

[0018] Step 2: Prefabricate tower foundation units in the factory;

[0019] Step 3: transport the prefabricated tower foundation unit to the construction site;

[0020] Step 4: Locate the positions of multiple tower foundation prefabricated units at the construction site;

[0021] Step 5: Assemble the tower foundation with the help of steel strands: hoist and fix the multiple tower foundation prefabricated units in place in sequence according to the positions of the multiple tower foundation prefabricated units located. After all the tower foundation prefabricated units are hoisted and fixed in place, the multiple tower foundation connection parts are hoisted together with stirrups to form a circular column with a cavity in the middle.

[0022] Among them, when the next tower foundation prefabricated unit is hoisted into place, the next tower foundation prefabricated unit is connected with the previous tower foundation prefabricated unit in the following way:

[0023] The adjacent tower foundation prefabricated units are tied together by steel strands;

[0024] Weld the arc-shaped embedded steel plates at the front ends of adjacent tower foundation prefabricated units;

[0025] Step 6: pouring concrete: insert a connecting steel bar into the circular hole formed by each two semicircular holes and pour concrete, then tie the column steel bars in the cavity of the circular column and pour concrete.

[0026] Furthermore, before the adjacent tower foundation prefabricated units are tied together by the steel strands, the adjacent tower foundation prefabricated units are first clamped by the hydraulic clamping device.

[0027] Furthermore, the hydraulic clamping device includes a main frame and two movable frames hinged at both ends of the main frame. Two hydraulic cylinders are hinged on the main frame for driving the two movable frames to swing. A plurality of limit blocks are respectively provided at the bottom of both ends of the main frame and the bottom of the movable frame. The limit blocks at the ends of the main frame and the limit blocks at the bottom of the movable frame cooperate to clamp the adjacent side panels of the adjacent tower foundation prefabricated units.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The present invention forms an annular wind turbine tower foundation by sequentially splicing a plurality of fan-shaped tower foundation prefabricated units, thereby enabling factory prefabrication of the tower foundation prefabricated units and effectively improving construction efficiency.

[0030] 2. The present invention can effectively reduce redundant material filling by setting the tower base support part as a frame structure, greatly reducing the dead weight compared to the solid structure, reducing the difficulty of transportation and lifting, and saving costs.

[0031] 3. The present invention provides a semicircular hole for burying connecting steel bars on the splicing side of each tower foundation connection part. Each of the semicircular holes is provided with a plurality of arc-shaped steel bars connected to the connecting steel bars from top to bottom. The connecting steel bars and the arc-shaped steel bars can connect two adjacent tower foundation connection parts, further enhancing the connection strength of the node and improving the stability of the overall structure.

[0032] 4. The present invention uses steel strands to tie and fix the two adjacent tower foundation support parts. The steel strands have high strength and good flexibility, so that the steel strands can evenly disperse the tension and avoid stress concentration, thereby effectively enhancing the integrity and stability of the entire wind turbine tower foundation. When dismantling, the entire structure can be removed for quick installation and reuse.

[0033] In summary, the present invention has a reasonable structural design and a simple construction method. By designing the tower foundation prefabricated unit as a frame structure, it can effectively reduce redundant material filling, greatly reduce the dead weight compared to the solid structure, reduce the difficulty of transportation and hoisting, save costs, and use steel strands to tie adjacent tower foundation prefabricated units, which can effectively avoid stress concentration, thereby effectively enhancing the integrity and stability of the entire wind turbine tower foundation. It can be removed as a whole during disassembly, realizing rapid installation and disassembly, and can be reused.

[0034] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a three-dimensional diagram of the wind turbine tower foundation of the present invention.

[0036] Figure 2 This is the front view of the wind turbine tower foundation of the present invention.

[0037] Figure 3 It is a three-dimensional diagram of the tower foundation prefabricated unit of the present invention.

[0038] Figure 4 It is a side view of the tower foundation prefabricated unit of the present invention.

[0039] Figure 5 It is a three-dimensional diagram of the arc-shaped embedded steel plate of the present invention.

[0040] Figure 6 It is a top view of the arc-shaped embedded steel plate of the present invention.

[0041] Figure 7 This is a schematic diagram of the positional relationship between the arc-shaped embedded steel plate and the tower foundation connection portion of the present invention.

[0042] Figure 8 This is a state diagram of the present invention when adjacent tower foundation prefabricated units are clamped by a hydraulic clamping device.

[0043] Figure 9 for Figure 8 Enlarged view of point A.

[0044] Figure 10 It is a structural schematic diagram of the hydraulic clamping device of the present invention.

[0045] Figure 11 4 is a flowchart of the method of the present invention.

[0046] Description of the accompanying drawings:

[0047] 1—tower foundation connection part; 2—tower foundation support part; 201—right-angled trapezoidal side plate;

[0048] 202—arc-shaped end plate; 203—first transverse stiffening rib; 204—second transverse stiffening rib;

[0049] 3—stirrups; 4—stirrup mounting slots; 5—connecting steel bars;

[0050] 6—semicircular hole; 7—arc-shaped steel bar; 8—arc-shaped embedded steel plate;

[0051] 9—anchor hook; 10—rebar insertion channel; 11—drainage hole;

[0052] 12—steel strand; 13—first steel strand perforation group; 14—second steel strand perforation group;

[0053] 15—main frame; 16—movable frame; 17—hydraulic cylinder;

[0054] 18—Limiting block; 19—C-type reinforcement. DETAILED DESCRIPTION

[0055] like Figures 1 to 7 As shown, the present invention and its embodiments provide an assembled prefabricated wind turbine tower foundation, comprising a plurality of tower foundation prefabricated units with fan-shaped cross sections, wherein the plurality of tower foundation prefabricated units are sequentially spliced to form an assembled prefabricated wind turbine tower foundation with a ring-shaped cross section;

[0056] Each of the tower foundation prefabricated units includes a tower foundation connection part 1 as a fan-shaped inner arc and a tower foundation support part 2 connected to the tower foundation connection part 1. A plurality of the tower foundation connection parts 1 are hooped together by stirrups 3 to form a hollow cylindrical structure. After the column steel bars are tied and concrete is poured in the cylindrical structure, a circular column for tower connection is formed. The tower foundation support part 2 is a frame structure. The splicing side of each of the tower foundation connection parts 1 is provided with a semicircular hole 6 for burying the connecting steel bars 5. A plurality of arc-shaped steel bars 7 are provided from top to bottom in each of the semicircular holes 6. An arc-shaped embedded steel plate 8 is provided on the side of the tower foundation connection part 1 away from the tower foundation support part 2. The arc-shaped embedded steel plate 8 is anchored to the surface of the tower foundation connection part 1 by an anchor hook 9. Two adjacent arc-shaped embedded steel plates 8 are welded, and the two adjacent tower foundation support parts 2 are fixed by a steel strand 12.

[0057] The tower foundation connection part 1 is arranged higher than the tower foundation support part 2 , and the top of the tower foundation support part 2 gradually slopes downward from an end close to the tower foundation connection part 1 to an end away from the tower foundation connection part 1 .

[0058] In actual use, by sequentially splicing a plurality of fan-shaped tower foundation prefabricated units to form a ring-shaped wind turbine tower foundation, the tower foundation prefabricated units can be prefabricated in a factory, which can effectively improve construction efficiency.

[0059] It should be noted that by setting the tower base support part 2 as a frame structure, redundant material filling can be effectively reduced, the dead weight can be greatly reduced compared to a solid structure, the difficulty of transportation and lifting can be reduced, and costs can be saved.

[0060] During specific implementation, an arc-shaped embedded steel plate 8 is set on the side of the tower foundation connection part 1 away from the tower foundation support part 2 through the anchor hook 9, so that the arc-shaped embedded steel plates 8 of multiple tower foundation prefabricated units are welded to form a cylindrical structure, which can not only connect multiple tower foundation prefabricated units, but also be used as a template to pour concrete in the cylindrical structure to form a circular column.

[0061] In addition, by providing a semicircular hole 6 for burying the connecting steel bar 5 on the splicing side of each tower foundation connection part 1, each of the semicircular holes 6 is provided with a plurality of arc-shaped steel bars 7 from top to bottom. The two adjacent tower foundation connection parts 1 can be connected by connecting the steel bars 5 and the arc-shaped steel bars 7, thereby further enhancing the connection strength of the node and improving the stability of the overall structure.

[0062] It should be noted that the two adjacent tower foundation support parts 2 are tied and fixed by the steel strands 12. The steel strands 12 have high strength and good flexibility, so that the steel strands 12 can evenly disperse the tension and avoid stress concentration, thereby effectively enhancing the integrity and stability of the entire wind turbine tower foundation. When dismantling, the entire structure can be removed for quick installation and reuse.

[0063] During specific implementation, two anchor hooks 9 are symmetrically provided on the arc-shaped embedded steel plate 8 , and the anchor hooks 9 are anchored in the tower foundation connection part 1 .

[0064] like Figure 5 and Figure 6 As shown, in a specific implementation, the connecting steel bar 5 is used to realize the connection between the tower and the wind turbine tower foundation, and a plurality of C-shaped bars 19 are fixed in sequence from top to bottom on the side of the arc-shaped embedded steel plate 8 away from the tower foundation connection part 1. The anchor bar hook 9 and the C-shaped bar 19 can connect the arc-shaped embedded steel plate 8 and the concrete structures on both sides thereof.

[0065] like Figure 3 As shown, in this embodiment, the tower foundation connecting portion 1 extends to the outer arc surface above the tower foundation supporting portion 2 and is provided with a stirrup clamping groove 4 for clamping stirrups.

[0066] like Figure 8 and Figure 9 As shown, in this embodiment, the arc-shaped steel bars 7 between two adjacent tower foundation connection parts 1 are arranged in an alternating manner to form a steel bar insertion channel 10 for inserting the connecting steel bars 5;

[0067] The connecting steel bars 5 are embedded in the semicircular hole 6 through concrete and are located in the steel bar insertion channel 10 .

[0068] In actual use, the connecting steel bars 5 are arranged along the height direction of the wind turbine tower foundation. When the connecting steel bars 5 are inserted into the steel bar insertion channel, the connection strength between the two adjacent tower foundation connection parts 1 can be effectively increased due to the action of the connecting steel bars 5.

[0069] During specific implementation, the concave arc surface of the arc-shaped steel bar 7 is arranged toward the hole wall of the semicircular hole 6 , and the arc-shaped steel bars 7 on the spliced sides of adjacent tower foundation connection parts 1 are arranged in an up-and-down staggered manner.

[0070] In this embodiment, the tower foundation connection part 1 and the tower foundation support part 2 are both reinforced concrete components and are integrally formed.

[0071] like Figure 3 As shown, in this embodiment, the tower base support part 2 includes two right-angled trapezoidal side panels 201 symmetrically connected on both sides of the tower base connection part 1, and the ends of the two right-angled trapezoidal side panels 201 away from the tower base connection part 1 are connected with arc-shaped end plates 202, and the first transverse stiffening rib 203 and the second transverse stiffening rib 204 are also connected between the two right-angled trapezoidal side panels 201.

[0072] In actual use, the right-angled trapezoidal side panels 201, the arc-shaped end panels 202, the first transverse stiffening ribs 203 and the second transverse stiffening ribs 204 form a stable geometric structure, which improves the overall stiffness of the small foundation, resists deformation under horizontal loads such as wind, and ensures structural stability.

[0073] During specific implementation, the right-angled trapezoidal side plate 201, the arc-shaped end plate 202, the first transverse stiffening rib 203 and the second transverse stiffening rib 204 are integrally formed.

[0074] In this embodiment, two drainage holes 11 are reserved on the arc-shaped end plate 202 .

[0075] In actual use, by reserving two drainage holes 11 on the arc-shaped end plate 202, it can not only play a role in drainage but also reduce weight.

[0076] like Figure 4 As shown, in this embodiment, the right-angled trapezoidal side plate 201 is reserved with a first steel strand perforation group 13 and a second steel strand perforation group 14. The first steel strand perforation group is arranged close to the tower foundation connection portion 1, and the second steel strand perforation group is arranged close to the arc-shaped end plate 202.

[0077] The plurality of steel strand perforations in the first steel strand perforation group are arranged in a hexagonal star shape, and the plurality of steel strand perforations in the second steel strand perforation group are arranged in a triangle shape.

[0078] At the same time, if Figures 8 to 11 As shown, the present invention and its embodiments further provide a construction method for an assembled prefabricated wind turbine tower foundation, the method comprising the following steps:

[0079] Step 1: Determine the number of tower foundation prefabricated units: Determine the number, size and weight of tower foundation prefabricated units based on the design size of the prefabricated wind turbine tower foundation, as well as the transportation and hoisting conditions;

[0080] Step 2: Prefabricate tower foundation units in the factory;

[0081] Step 3: transport the prefabricated tower foundation unit to the construction site;

[0082] Step 4: Locate the positions of multiple tower foundation prefabricated units at the construction site;

[0083] Step 5: Assemble the tower foundation with the help of steel strands: hoist and fix the multiple tower foundation prefabricated units in place in sequence according to the positions of the multiple tower foundation prefabricated units located. After all the tower foundation prefabricated units are hoisted and fixed in place, the multiple tower foundation connection parts 1 are hoisted together by stirrups 3. The multiple tower foundation connection parts 1 are enclosed into a circular column with a cavity in the middle.

[0084] Among them, when the next tower foundation prefabricated unit is hoisted into place, the next tower foundation prefabricated unit is connected with the previous tower foundation prefabricated unit in the following way:

[0085] The adjacent tower foundation prefabricated units are tied together by steel strands 12;

[0086] Welding the arc-shaped embedded steel plates 8 at the front ends of adjacent tower foundation prefabricated units;

[0087] Step 6: pouring concrete: insert a connecting steel bar 5 into the circular hole formed by each of the two semicircular holes 6 and pour concrete, then tie the column steel bars in the cavity of the circular column and pour concrete;

[0088] Among them, when the column reinforcement is tied in the cavity of the circular column, the main reinforcement of the column reinforcement passes through the channel formed between the C-shaped reinforcement 19 and the arc-shaped embedded steel plate 8, which can realize the connection between the cast-in-place circular column and the assembled prefabricated wind power tower foundation.

[0089] In this embodiment, before the adjacent tower foundation prefabricated units are tied together by the steel strands 12 , the adjacent tower foundation prefabricated units are first clamped by a hydraulic clamping device.

[0090] In actual use, when the adjacent tower foundation prefabricated units are clamped by the hydraulic clamping device, the adjacent right-angled trapezoidal side panels 201 in the adjacent tower foundation prefabricated units are clamped to avoid excessive gaps between the adjacent tower foundation prefabricated units.

[0091] like Figure 10As shown, in this embodiment, the hydraulic clamping device includes a main frame 15 and two movable frames 16 respectively hinged at both ends of the main frame 15, and two hydraulic cylinders 17 are hinged on the main frame 15 for driving the two movable frames 16 to swing respectively. A plurality of limit blocks 18 are respectively provided at the bottom of both ends of the main frame 15 and the bottom of the movable frame 16. The limit blocks 18 at the ends of the main frame 15 and the limit blocks 18 at the bottom of the movable frame 16 cooperate to clamp the adjacent side panels in the adjacent tower foundation prefabricated units.

[0092] In actual use, the main frame 15 includes a trapezoidal outer frame, a first transverse connecting rod arranged in the middle of the trapezoidal outer frame, and a vertical rod vertically arranged in the middle upper part of the first transverse connecting rod. The cylinder bodies of the two hydraulic cylinders 17 are respectively hingedly installed on both sides of the vertical rod, and the piston ends of the two hydraulic cylinders 17 are respectively hinged on the two movable frames 16.

[0093] It should be noted that the movable frame 16 includes two movable rods respectively connected to both sides of the end of the main frame 15 and a second transverse connecting rod connected between the ends of the two movable rods away from the main frame 15, and the piston end of the hydraulic cylinder 17 is hinged at the middle of the second transverse connecting rod.

[0094] During specific implementation, the limit block 18 is an L-shaped limit block.

[0095] In the specific construction, the following methods are adopted:

[0096] (1) Split design of wind turbine tower foundation:

[0097] The size and weight of the tower foundation prefabricated units should be reasonably determined based on transportation and lifting conditions. Avoid tower foundation prefabricated units that are too large or too heavy, which would make transportation and lifting difficult; nor too small, which would result in excessive assembly work. The wind turbine tower foundation should be split into multiple tower foundation prefabricated units, taking into account various working conditions such as wind loads and the tower's own weight, to ensure that the splitting does not affect the overall structural safety. Each tower foundation prefabricated unit adopts a lattice frame structure, forming a geometrically stable grid with a hollow area inside the grid to reduce redundant filling material and reduce deadweight.

[0098] (2) Factory prefabrication:

[0099] During construction, the tower foundation prefabricated units are prefabricated in the factory first, which can greatly improve construction efficiency, make transportation and construction more convenient, and save costs. The prefabrication process includes template customization, steel bar layout, pre-embedded connectors, concrete pouring, and maintenance.

[0100] Customized formwork: Customized formwork is designed based on the design dimensions of the tower foundation prefabricated units. Steel formwork is used, ensuring sufficient strength, rigidity, and stability. The dimensions of each formwork component are precisely controlled, resulting in a higher precision than the finished component.

[0101] Rebar arrangement: Rebars are tied inside the formwork. Rebars are arranged on the right-angled trapezoidal side panels 201, the arc-shaped end panels 202, the first transverse stiffening ribs 203 and the second transverse stiffening ribs 204 respectively. The anchorage length and connection quality of the reinforcement are ensured at the nodes. Welding is used to ensure that the reinforcement is firmly connected to form a stable reinforcement skeleton.

[0102] Concrete pouring: Select concrete of appropriate strength grade and pour in layers to ensure that the concrete is dense. During the pouring process, control the pouring speed and height to prevent the concrete from exerting excessive lateral pressure on the formwork.

[0103] Curing: After the concrete pouring is completed, steam curing should be carried out in time to ensure the normal growth of concrete strength.

[0104] (3) On-site assembly:

[0105] After being cured to reach the designed strength, it is transported to the site for assembly, including site preparation, hoisting into place, prefabricated construction, node processing, and concrete pouring.

[0106] Site Preparation: At the construction site, the foundation installation area is leveled and compacted to ensure it can support the weight of the tower foundation prefabricated units and subsequent construction equipment. The installation location of each tower foundation prefabricated unit is accurately measured and marked, and positioning control lines are set.

[0107] Lifting and Installation: Using appropriate lifting equipment, the tower foundation prefabricated units are lifted and installed one by one to the designated location according to the pre-planned lifting sequence. After each tower foundation prefabricated unit is in place, it is secured with temporary support devices, and its horizontal and vertical alignment is adjusted to ensure that deviations are within the design tolerances.

[0108] Assembly construction: After any tower foundation prefabricated unit except the first one is hoisted into place, the hydraulic clamping device is dropped on the adjacent installed tower foundation prefabricated unit, and the center position of the main frame 15 is made to coincide with the center position of the second transverse stiffening rib 204 of the tower foundation prefabricated unit. The four limit blocks 18 on the main frame 15 are inserted into the four corners of the second transverse stiffening rib 204, and the two movable frames 16 are respectively driven to rotate by two hydraulic cylinders 17. When the two movable frames 16 are respectively fitted and inserted into the adjacent tower foundation prefabricated units, the hydraulic cylinder 17 is controlled to stop moving. At this time, accurate positioning is completed, and there is no need for manual alignment by the installer, thereby improving the efficiency of tower foundation prefabricated unit position correction.

[0109] It should be noted that when the two movable frames 16 are respectively fitted and inserted into adjacent tower foundation prefabricated units, the two limit blocks 18 at the bottom of the movable frame 16 are respectively inserted into the two corners formed by the second transverse stiffening rib 204 and the right-angled trapezoidal side panel 201 of the corresponding tower foundation prefabricated unit.

[0110] When the adjacent tower foundation prefabricated units are tied together by the steel strands 12, the steel strands 12 are drawn in the form of a single stroke, starting from the initial tower foundation prefabricated unit, and sequentially through the preset reserved holes of the adjacent tower foundation prefabricated units, forming a continuous, closed line quick-release system in the entire foundation structure. When the hydraulic clamping device is activated, the steel strands 12 are in a tensioned state, ensuring that the adjacent tower foundation prefabricated units are tightly connected together, achieving the required connection strength and stability standards, and ensuring the safe operation of the wind turbine tower foundation under various complex working conditions. The subsequent tower foundation prefabricated units are then installed and connected in sequence, so that multiple tower foundation prefabricated units are connected into an integral structure through the quick-release system.

[0111] Node connection: By connecting the steel bars 5 and the curved steel bars 7 for assembly, the stability and reliability of the overall structure are ensured, thus efficiently completing the foundation construction. After assembly, the prefabricated tower foundation units can work together to jointly bear the loads transferred from the superstructure.

[0112] Pouring concrete: After the assembly is completed, concrete is poured into the central circular cavity formed by each tower foundation prefabricated unit and the circular hole formed by every two semicircular holes 6.

[0113] Removal of steel strands: When turnover is required and the concrete strength reaches the design requirements, remove the steel strands 12.

[0114] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An assembled prefabricated wind turbine tower foundation, characterized by: It comprises a plurality of tower foundation prefabricated units with fan-shaped cross sections, wherein the plurality of tower foundation prefabricated units are sequentially spliced to form an assembled prefabricated wind turbine tower foundation with a ring-shaped cross section; Each of the tower foundation prefabricated units comprises a tower foundation connection portion (1) as a fan-shaped inner arc and a tower foundation support portion (2) connected to the tower foundation connection portion (1). A plurality of the tower foundation connection portions (1) are hooped together by stirrups (3) to form a hollow cylindrical structure. After the column steel bars are tied and concrete is poured in the cylindrical structure, a circular column for tower connection is formed. The tower foundation support portion (2) is a frame structure. The splicing side of each of the tower foundation connection portions (1) is provided with A semicircular hole (6) for embedding connecting steel bars (5), wherein a plurality of arc-shaped steel bars (7) are arranged in each of the semicircular holes (6) from top to bottom, an arc-shaped embedded steel plate (8) is arranged on the side of the tower foundation connection part (1) away from the tower foundation support part (2), and the arc-shaped embedded steel plate (8) is anchored to the surface of the tower foundation connection part (1) through an anchor bar hook (9), two adjacent arc-shaped embedded steel plates (8) are welded, and two adjacent tower foundation support parts (2) are tied and fixed by a steel strand (12); The tower foundation connection portion (1) is arranged higher than the tower foundation support portion (2), and the top of the tower foundation support portion (2) gradually slopes downward from an end close to the tower foundation connection portion (1) to an end away from the tower foundation connection portion (1); The tower base support portion (2) comprises two right-angled trapezoidal side panels (201) symmetrically connected to both sides of the tower base connection portion (1); one end of the two right-angled trapezoidal side panels (201) away from the tower base connection portion (1) is connected to an arc-shaped end panel (202); and a first transverse stiffening rib (203) and a second transverse stiffening rib (204) are further connected between the two right-angled trapezoidal side panels (201).

2. The prefabricated wind turbine tower foundation according to claim 1, characterized in that: The tower base connection portion (1) is extended to an outer arc surface above the tower base support portion (2), and a stirrup clamping groove (4) for clamping stirrups is provided.

3. The prefabricated wind turbine tower foundation according to claim 1, characterized in that: The arc-shaped steel bars (7) between two adjacent tower foundation connection parts (1) are arranged in an alternating pattern to form a steel bar insertion channel (10) for inserting the connecting steel bars (5); The connecting steel bars (5) are embedded in the semicircular hole (6) through concrete and are located in the steel bar insertion channel (10).

4. The prefabricated wind turbine tower foundation according to claim 1, characterized in that: The tower base connecting portion (1) and the tower base supporting portion (2) are both reinforced concrete components and are integrally formed.

5. The prefabricated wind turbine tower foundation according to claim 1, characterized in that: Two drainage holes (11) are reserved on the arc-shaped end plate (202).

6. The prefabricated wind turbine tower foundation according to claim 1, characterized in that: A first steel strand perforation group (13) and a second steel strand perforation group (14) are reserved on the right-angled trapezoidal side plate (201), wherein the first steel strand perforation group is arranged close to the tower base connection portion (1), and the second steel strand perforation group is arranged close to the arc-shaped end plate (202); The plurality of steel strand perforations in the first steel strand perforation group are arranged in a hexagonal star shape, and the plurality of steel strand perforations in the second steel strand perforation group are arranged in a triangle shape.

7. A construction method for an assembled prefabricated wind turbine tower foundation as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Determine the number of tower foundation prefabricated units: Determine the number, size and weight of tower foundation prefabricated units based on the design size of the prefabricated wind turbine tower foundation, as well as the transportation and hoisting conditions; Step 2: Prefabricate tower foundation units in the factory; Step 3: transport the prefabricated tower foundation unit to the construction site; Step 4: Locate the positions of multiple tower foundation prefabricated units at the construction site; Step 5: Assemble the tower foundation with the help of steel strands: hoist and fix the multiple tower foundation prefabricated units in place in sequence according to the positions of the multiple tower foundation prefabricated units located. When all the tower foundation prefabricated units are hoisted and fixed in place, hoop the multiple tower foundation connection parts (1) together with stirrups (3). The multiple tower foundation connection parts (1) are enclosed to form a circular column with a cavity in the middle. Among them, when the next tower foundation prefabricated unit is hoisted into place, the next tower foundation prefabricated unit is connected with the previous tower foundation prefabricated unit in the following way: The adjacent tower foundation prefabricated units are tied together by steel strands (12); Welding the arc-shaped embedded steel plates (8) at the front ends of adjacent tower foundation prefabricated units; Step 6: pouring concrete: insert a connecting steel bar (5) into the circular hole formed by each of the two semicircular holes (6) and pour concrete, then tie the column steel bars in the cavity of the circular column and pour concrete.

8. The construction method of a prefabricated wind turbine tower foundation according to claim 7, characterized in that: Before the adjacent tower base prefabricated units are tied together by the steel strands (12), the adjacent tower base prefabricated units are first clamped by a hydraulic clamping device.

9. The construction method of a prefabricated wind turbine tower foundation according to claim 8, characterized in that: The hydraulic clamping device comprises a main frame (15) and two movable frames (16) respectively hinged at both ends of the main frame (15); two hydraulic cylinders (17) are hinged on the main frame (15) for driving the two movable frames (16) to swing; a plurality of limit blocks (18) are respectively provided at the bottoms of both ends of the main frame (15) and the bottoms of the movable frames (16); the limit blocks (18) at the ends of the main frame (15) and the limit blocks (18) at the bottoms of the movable frames (16) cooperate to clamp adjacent side panels of adjacent tower foundation prefabricated units.

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