Method for constructing a static load test bench for box fan blades

Abstract

This invention discloses the structure and construction method of a box-type wind turbine blade static load test bench. The construction method includes: pre-embedding fixing components and installing prestressed tendon corrugated pipes within the base slab foundation; pouring concrete within the base slab foundation and completing curing to form the base slab; installing the truss required for the anchor bolt cage on the base slab; installing and fixing the prestressed steel strands and prestressed tendon corrugated pipes for the dynamic load test bench; binding and fixing the base reinforcement in layers and installing and fixing the construction duct steel formwork; constructing the base in sections from the bottom surface of the base slab to the center of the truss cylinder and the preset base height to form a base with a box-type structure; forming a construction portal on the base; installing two sets of prestressed components in the vertical and longitudinal directions of the base and connecting them to two sets of prestressed tendons; alternately tensioning the two sets of prestressed tendons according to a preset tensioning sequence, so that the prestress of the two sets of prestressed tendons successively reaches 30%, 60%, and 100% of the specified tension stress. This improves the bending and torsional bearing capacity of the base.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade fixing technology, and in particular to a method for constructing a static load test bench for box-type wind turbine blades. Background Technology

[0002] With the continuous development of new energy sources, wind turbine power generation is also constantly moving towards larger single-unit capacities, resulting in a continuous increase in the size of wind turbine blades. Before wind turbine blades are put into production and use, the blades need to undergo a large number of static and dynamic load tests on a test bench.

[0003] In wind turbine blade test rigs, the base is typically used as the connection point between the blade and the test rig, anchoring the blade root to the base. The load on the blade is controlled by adjusting the displacement of the motor. Therefore, the base is the area on the entire test rig that bears the most concentrated test load. However, with the increasing size of new wind turbine blades, a base structure that is both structurally sound and easy to construct is needed to withstand combined compression, bending, shear, and torsion loading. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for constructing a static load test bench for box-type wind turbine blades, which improves the bending and torsional bearing capacity of the base and facilitates construction.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A method for constructing a static load test bench for box-type wind turbine blades includes:

[0007] Pre-embed fasteners in the foundation slab and install prestressed tendon corrugated pipes;

[0008] Concrete is poured into the foundation slab and cured to form the foundation slab.

[0009] The truss required for the anchor cage is installed on the base plate;

[0010] Prestressed steel strands and prestressed tendon corrugated pipes are installed on the fixed dynamic load test bench.

[0011] The base reinforcement bars are tied and fixed in layers, and the steel formwork for the construction ducts is installed and fixed.

[0012] The foundation is poured in sections from the bottom surface of the base plate to the center of the cylindrical section of the truss and the predetermined base height, forming a base with a box-shaped structure; and a construction doorway is formed on the base.

[0013] Two sets of prestressed components are respectively installed in the vertical and longitudinal directions of the base and connected to two sets of prestressed tendons;

[0014] The two sets of prestressing tendons are tensioned alternately according to a preset tensioning sequence, so that the prestress of the two sets of prestressing tendons reaches 30%, 60% and 100% of the specified tension stress in sequence.

[0015] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0016] A static load test bench for box-type wind turbine blades includes a base plate, a base, three sets of prestressed components, and three sets of prestressed tendons; the base is made of fiber-reinforced concrete.

[0017] The base is disposed on the bottom plate, and the base includes an anchor wall and stiffening walls disposed on both sides of the anchor wall; the anchor wall is provided with mounting holes for mounting fan blades and experimental motors.

[0018] Each of the prestressed components includes two fasteners;

[0019] The two fasteners of the first group of prestressed components are respectively disposed on the top side of the stiffening wall and inside the base plate. The prestressed tendons of the first group pass through the base plate and the base to connect the two fasteners.

[0020] The two fasteners of the second set of prestressed components are respectively disposed on the left and right sides of the base, and the prestressed tendons of the second set pass through the base to connect the two fasteners.

[0021] The two fasteners of the third group of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressed tendons of the third group pass through the base to connect the two fasteners.

[0022] The beneficial effects of this invention are as follows: By pre-embedding fixing components in the foundation slab and setting up the truss, prestressed steel strands, and prestressed tendon corrugated pipes required for the anchor bolt cage on the foundation slab, a box-shaped base is constructed by pouring concrete. The box-shaped structure can improve the bending and torsional bearing capacity of the base. A construction portal is formed on the base, allowing workers to conduct tests through the portal. At the same time, two sets of prestressed components are set in the vertical and longitudinal directions respectively and connected to two sets of prestressed tendons, thereby improving the fatigue resistance and crack resistance of the base in both the vertical and longitudinal directions, resulting in good overall mechanical properties of the base and enhancing the overall stress performance of the structure. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the steps of constructing a static load test bench for box-type wind turbine blades according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the usage structure of a box-type wind turbine blade static load test bench in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the side cross-sectional structure of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0027] Figure 5 This is a top view of a static load test bench for box-type wind turbine blades according to an embodiment of the present invention;

[0028] Figure 6 This is a side view of a static load test bench for box-type wind turbine blades according to an embodiment of the present invention.

[0029] Figure 7 This is a front view structural schematic diagram of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0030] Figure 8 This is a top view of the fixing component of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0031] Figure 9 This is a side view of the fixing component of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the bellows arrangement of a box-type wind turbine blade static load test bench in an embodiment of the present invention;

[0033] Figure 11 This is a side view of the anchor bolt cage installation truss of a box-type wind turbine blade static load test bench according to an embodiment of the present invention.

[0034] Figure 12 This is a front view of the anchor bolt cage installation truss of a box-type wind turbine blade static load test bench according to an embodiment of the present invention;

[0035] Label Explanation:

[0036] 1. Base plate; 2. Foundation; 21. Anchor wall; 22. Enclosed wall; 23. Stiffening wall; 24. Cantilever wall; 25. Construction doorway; 26. Installation hole; 27. Anchor bolt hole group;

[0037] 3. Prestressed components; 31. Fasteners; 311. Anchor blocks; 3111. Steel plates; 3112. Anchoring bars; 312. Fixing anchors;

[0038] 4. Prestressed tendons; 5. Anchor bolt cage installation truss; 6. Cable tie device; 7. Vertical corrugated pipe; 8. Horizontal corrugated pipe. Detailed Implementation

[0039] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0040] A method for constructing a static load test bench for box-type wind turbine blades includes:

[0041] Pre-embed fasteners in the foundation slab and install prestressed tendon corrugated pipes;

[0042] Concrete is poured into the foundation slab and cured to form the foundation slab.

[0043] The truss required for the anchor cage is installed on the base plate;

[0044] Prestressed steel strands and prestressed tendon corrugated pipes are installed on the fixed dynamic load test bench.

[0045] The base reinforcement bars are tied and fixed in layers, and the steel formwork for the construction ducts is installed and fixed.

[0046] The base is poured in sections from the bottom surface of the base plate to the center of the cylinder of the truss and the predetermined base height to form a base with a box-shaped structure; and a construction doorway is formed on the base.

[0047] Two sets of prestressed components are respectively installed in the vertical and longitudinal directions of the base and connected to two sets of prestressed tendons;

[0048] The two sets of prestressing tendons are tensioned alternately according to a preset tensioning sequence, so that the prestress of the two sets of prestressing tendons reaches 30%, 60% and 100% of the specified tension stress in sequence.

[0049] As described above, the beneficial effects of this invention are as follows: by pre-embedding fixing components in the foundation slab and setting up the truss, prestressed steel strands, and prestressed tendon corrugated pipes required for the anchor bolt cage on the foundation slab, a box-shaped base is constructed by pouring concrete. The box-shaped structure can improve the bending and torsional bearing capacity of the base. A construction portal is formed on the base, allowing workers to conduct tests through the portal. At the same time, two sets of prestressed components are set in the vertical and longitudinal directions respectively and connected to two sets of prestressed tendons, thereby improving the fatigue resistance and crack resistance of the base in both the vertical and longitudinal directions, resulting in good overall mechanical properties of the base and enhancing the overall stress performance of the structure.

[0050] Furthermore, the segmented casting construction from the bottom surface of the base plate to the center of the cylinder of the truss and the predetermined base height includes:

[0051] Construction of the cylindrical section from the bottom surface of the base plate to the center of the truss;

[0052] The truss is constructed by pouring concrete from the center of the cylindrical section to the top section of the truss.

[0053] The truss is poured from the top section to the predetermined base height.

[0054] As described above, by performing three segmented pouring operations in sequence, the base structure and the installation holes on the base can be effectively formed, thus ensuring the strength of the base structure.

[0055] Furthermore, the base includes an anchoring wall, a closed wall, and a box-shaped structure formed by two stiffening walls;

[0056] The base forming the box-shaped structure includes:

[0057] The anchor wall, stiffening wall and sealing wall are formed simultaneously through the pouring construction, and an installation hole is formed in the anchor wall and a construction doorway is formed in the sealing wall.

[0058] The mounting holes are used to install the fan blades and the experimental motor.

[0059] As described above, the foundation of the box-shaped structure is formed by the casting construction, which consists of anchor walls, closed walls, and two stiffening walls. The stiffening walls and closed walls increase the cross-sectional modulus of the foundation, and the box-shaped structure improves the bending and torsional bearing capacity of the foundation.

[0060] Furthermore, the base forming the box-shaped structure further includes:

[0061] An outward-projecting wall is formed on the outer side of the stiffening wall;

[0062] The cantilever wall and the closed wall are formed on the same plane, and the thickness and height of the cantilever wall are the same as those of the closed wall.

[0063] As described above, by forming cantilevered walls with the same thickness and height as the closed wall on both sides of the base, and setting the cantilevered walls and the closed wall on the same plane, the cross-sectional modulus of the base is increased, thereby further improving the load-bearing capacity of the base.

[0064] Furthermore, the length of the cantilevered wall is not greater than a preset value;

[0065] The preset value is one-quarter of the shortest distance from the outer side of the stiffening wall to the symmetrical plane of the two stiffening walls.

[0066] As described above, by calculating and limiting the length of the cantilever wall, the problem of the cantilever wall being too long and unable to effectively bear the cross-sectional modulus moment, or even leading to a decrease in load-bearing capacity, can be avoided.

[0067] Furthermore, the construction opening is formed on the central axis along the length of the enclosed wall;

[0068] The distance from the top surface of the construction portal to the top surface of the enclosed wall is not less than twice the thickness of the stiffening wall.

[0069] As can be seen from the above description, by limiting the height of the construction opening, the problem of the base's bending and torsional resistance decreasing due to the excessive size of the construction opening, thus failing to effectively provide load-bearing capacity for the wind turbine blades, can be avoided.

[0070] Furthermore, the base forming the box-shaped structure includes:

[0071] The distance from the end of the stiffening wall away from the anchor wall to the anchor wall is set to 1 / 3 to 1 / 2 of the height of the anchor wall.

[0072] As described above, by setting the distance from the stiffening wall away from the blade end to the anchor wall to 1 / 3 to 1 / 2 of the anchor wall height, the specific dimensions of the distance can conform to the calculation results of the bending and torsional bearing capacity of the base under static load, thereby improving the stress performance of the base.

[0073] Furthermore, the base forming the box-shaped structure includes:

[0074] The outer side of the anchoring wall forms an angle of 65°-80° with the plane of the base plate;

[0075] The central axis of the mounting hole forms an angle of 10°-25° with the plane of the base plate.

[0076] As described above, by forming an angle of 65°-80° between the plane of the anchor wall and the plane of the base plate, and an angle of 10°-25° between the central axis of the mounting hole and the plane of the base plate, the mounting surface of the anchor wall is tilted upwards. Since the wind turbine blades oscillate back and forth during testing, tilting the mounting surface of the anchor wall upwards allows the wind turbine blades to tilt upwards during installation, reducing the height of the base and thus lowering costs. At the same time, compared to dynamic loads, the blades experience greater forces under static loads, resulting in a greater degree of blade drooping. Therefore, the base needs to be set at a relatively large angle to allow the blades to initially tilt upwards to a higher height, preventing the blades from hitting the ground after drooping.

[0077] Furthermore, it also includes two sets of prestressed components and two sets of prestressed tendons;

[0078] Each set of the prestressed components includes two fasteners;

[0079] One of the fasteners of the first set of prestressed components is set on the top side of the junction of the stiffening wall and the closed wall, and the other fastener is a pre-embedded fastener; the two fasteners are connected by the first set of prestressed tendons passing through the base and the bottom plate;

[0080] The two fasteners of the second set of prestressed components are respectively set on the front and rear sides of the base, and the two fasteners are connected by the second set of prestressed tendons passing through the anchor wall, stiffening wall and closing wall in sequence.

[0081] As described above, by setting stiffening walls and closed walls to increase the cross-sectional modulus of the base, and further by setting two sets of prestressed components and two sets of prestressed tendons, the fatigue resistance and crack resistance of the base are improved in both the vertical and longitudinal directions, resulting in good overall mechanical properties of the base and thus enhancing the overall load-bearing capacity of the structure.

[0082] Furthermore, the fastener includes an anchor block and a fixing anchor;

[0083] The anchor block is disposed on the surface of the base;

[0084] The fixed anchor is disposed within the anchor block, the base, or the bottom plate;

[0085] The two opposing fixed anchors are connected by the prestressed tendons.

[0086] As can be seen from the above description, by using anchor blocks and fixed anchors to fix the prestressing tendons, the installation of prestressing tendons under different installation requirements can be met.

[0087] Another embodiment of the present invention provides a structure for a static load test bench for box-type wind turbine blades, including a base plate, a base, three sets of prestressed components, and three sets of prestressed tendons; the base is made of fiber-reinforced concrete;

[0088] The base is disposed on the bottom plate, and the base includes an anchor wall and stiffening walls disposed on both sides of the anchor wall; the anchor wall is provided with mounting holes for mounting fan blades and experimental motors.

[0089] Each of the prestressed components includes two fasteners;

[0090] The two fasteners of the first group of prestressed components are respectively disposed on the top side of the stiffening wall and inside the base plate. The prestressed tendons of the first group pass through the base plate and the base to connect the two fasteners.

[0091] The two fasteners of the second set of prestressed components are respectively disposed on the left and right sides of the base, and the prestressed tendons of the second set pass through the base to connect the two fasteners.

[0092] The two fasteners of the third group of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressed tendons of the third group pass through the base to connect the two fasteners.

[0093] The wind turbine blade static load fixing device and its construction method provided by the present invention can be applied to scenarios where wind turbine blades are fixed by static load. The following is a detailed description of the specific embodiments:

[0094] Example 1

[0095] Please refer to Figure 1 A method for constructing a static load test bench for box-type wind turbine blades, comprising:

[0096] S1. Embed fasteners 31 within the foundation slab 1 and install prestressed tendons 4 corrugated pipes; please refer to Figure 10 That is, the base 22 vertical reinforcement anchorage section is configured in the foundation of the base 1, and the anchorage of the fixed section of the pre-embedded vertical prestressed tendon 44 and the vertical corrugated pipe 77 of the base 1 section are connected.

[0097] S2. Pour concrete into the foundation of the base plate 1 and complete the curing to form the base plate 1;

[0098] S3. Set the truss required for the anchor bolt cage on the base plate 1; hoist the steel structure truss required for the anchor bolt cage into place using equipment.

[0099] S4. Install the prestressed steel strands and prestressed tendons 4 corrugated pipes of the fixed dynamic load test bench; that is, install the prestressed steel strands and transverse corrugated pipes 8 of the fixed static load test bench.

[0100] S5. Tie and fix the reinforcing bars of base 2 in layers, and install and fix the steel formwork of the construction duct;

[0101] S6. The base plate 1 is poured in sections sequentially from its bottom surface to the center of the truss cylinder and the pre-set height of the base 2, forming a box-shaped base 2; and a construction doorway 25 is formed on the base 2, such as... Figure 11 and Figure 12 As shown, the installation method of the anchor cage mounting truss 5 and the base plate 11 is illustrated. Specifically:

[0102] S61. Construction of the cylindrical central section from the bottom surface of the base plate 1 to the truss;

[0103] S62. Constructing the section from the center of the cylindrical part of the truss to the top section of the truss; so that the construction opening 25 is formed on the central axis of the length direction of the closed wall 22; and the distance from the top surface of the construction opening 25 to the top surface of the closed wall 22 is not less than twice the thickness of the stiffening wall 23.

[0104] S63. Construction is carried out from the top section of the truss to the height of the preset base 2; that is, construction is carried out from the top section of the truss to the top area of ​​the base 2, and curing and demolding are completed; in this embodiment, the base 2 includes a box-shaped structure formed by an anchor wall 21, a closed wall 22 and two stiffening walls 23; when forming the base 2 with the box-shaped structure, the anchor wall 21, the stiffening wall 23 and the closed wall 22 are formed simultaneously through the construction, and an installation hole 26 is formed in the anchor wall 21, and a construction doorway 25 is formed on the closed wall 22; the installation hole 26 is used to install the fan blades and the experimental motor. Specifically, the distance from the end of the stiffening wall 23 away from the anchor wall 21 to the anchor wall 21 is set to 1 / 3 to 1 / 2 of the height of the anchor wall 21; the outer side of the anchor wall 21 forms an angle of 65° to 80° with the plane of the base plate 1; and the central axis of the mounting hole 26 forms an angle of 10° to 25° with the plane of the base plate 1.

[0105] Meanwhile, in an optional embodiment, a cantilever wall 24 is formed on the outer side of the stiffening wall 23; the cantilever wall 24 and the closed wall 22 are formed on the same plane, and the thickness and height of the cantilever wall 24 are the same as those of the closed wall 22; and the length of the cantilever wall 24 is not greater than a preset value; the preset value is one-quarter of the shortest distance from the outer side of the stiffening wall 23 to the symmetrical plane of the two stiffening walls 23; specifically expressed by the formula: d≤Sn / 4; d represents the length of the cantilever wall 2424, and Sn represents the shortest distance from the outer side of the stiffening wall 2323 to the symmetrical plane of the two stiffening walls 2323. The decision on whether to set the cantilever wall 2424 needs to be determined based on the calculation results of the closed wall 2222 according to the requirements of the base 22.

[0106] S7. Two sets of prestressed components 3 are respectively arranged in the vertical and longitudinal directions of the base 2 and connected to two sets of prestressed tendons 4. Each set of prestressed components 3 includes two fasteners 31, and the specific arrangement is as follows:

[0107] One of the fixing members 31 of the first group of prestressed components 3 is set on the top side of the junction of the stiffening wall 23 and the closed wall 22, and the other fixing member 31 is a pre-embedded fixing member 31; the two fixing members 31 are connected by the first group of prestressed tendons 4 passing through the base 2 and the bottom plate 1.

[0108] The two fixing members 31 of the second set of prestressed components 3 are respectively set on the front and rear sides of the base 2, and the two fixing members 31 are connected by the second set of prestressed tendons 4 passing through the anchor wall 21, the stiffening wall 23 and the closing wall 22 in sequence.

[0109] The fixing component 31 includes an anchor block 311 and a fixing anchor 312; the anchor block 311 is disposed on the surface of the base 2; the fixing anchor 312 is disposed inside the anchor block 311, inside the base 2 or inside the bottom plate 1; the two opposing fixing anchors 312 are connected by the prestressed tendons 4.

[0110] S8. The two sets of prestressing tendons 4 are tensioned alternately according to a preset tensioning sequence, so that the prestress of the two sets of prestressing tendons 4 successively reaches 30%, 60%, and 100% of the specified tension stress. For example, the prestressing tendons 4 are tensioned alternately to 30% of the specified tension stress in the longitudinal direction first, then in the vertical direction; then in the same sequence, the prestressing tendons 4 are tensioned alternately to 60% of the specified tension stress; and finally, in the same sequence, the prestressing tendons 4 are tensioned alternately to 100% of the specified tension stress.

[0111] The static load test rig for box-type wind turbine blades constructed using the above-mentioned method is as follows:

[0112] Please refer to Figures 1 to 12 A box-type wind turbine blade static load test bench includes a base plate 1 and a base 2 mounted on the base plate 1. The base 2 includes a box-shaped structure formed by anchor walls 21, closed walls 22, and two stiffening walls 23. The anchor walls 21, closed walls 22, and stiffening walls are reinforced concrete structures, and the four walls together form the main body of the base 2. In other optional embodiments, a fiber-reinforced concrete structure is used to increase the crack resistance of the base 2. A cable tie device 6 is also provided on the base plate 1; the cable tie device 6 is used to connect to the wind turbine blade.

[0113] Anchor wall 21 and sealing wall 22 are arranged opposite each other in a first direction, which is the installation direction of the fan blades. Two stiffening walls 23 are arranged opposite each other in a second direction and connect anchor wall 21 and sealing wall 22. That is, stiffening walls 23 are arranged on both sides behind anchor wall 21 and are located on two opposite sides of fan blades. At the same time, the distance from the end of stiffening wall 23 away from anchor wall 21 to anchor wall 21 is 1 / 3 to 1 / 2 of the height of anchor wall 21.

[0114] Please refer to Figure 4 A construction doorway 25 is provided on the side of the closed wall 22 near the base plate 1; the construction doorway 25 is located on the central axis of the length direction of the closed wall 22, and the length direction is the second direction; that is, the construction doorway 25 is located in the middle of the two stiffening walls 23; and the distance from the top surface of the construction doorway 25 to the top surface of the closed wall 22 is not less than twice the thickness of the stiffening wall 23.

[0115] The anchor wall 21 is provided with mounting holes 26 for mounting fan blades and experimental motors. The outer surface of the anchor wall 21 forms an angle of 65°-80° with the plane of the base plate 1; the central axis of the mounting hole 26 forms an angle of 10°-25° with the plane of the base plate 1. Figure 6 As shown, mounting hole 26 is a single hole located in the center of anchor bolt hole group 27; anchor bolt hole group 27 is a ring array of several evenly distributed circular holes, the geometric center of which coincides with the geometric center of anchor wall 21, and the hole shape is set according to actual experimental requirements. When installing the wind turbine blades, the anchor bolt cage at the root of the wind turbine blades is passed through anchor bolt hole group 27 to anchor the wind turbine blades to the base 2.

[0116] In an optional embodiment, the base 2 further includes a cantilever wall 24; the cantilever wall 24 is connected to the stiffening wall 23, and the cantilever wall 24 and the closed wall 22 are arranged on the same plane; the thickness and height of the cantilever wall 24 are the same as the thickness and height of the closed wall 22; that is, the cantilever wall 24 extends out of the outer surface of the stiffening wall 23 along the plane where the closed wall 22 is located.

[0117] Please refer to Figure 5 and Figure 6 The base 2 is also equipped with a bidirectional prestressing system consisting of a longitudinal prestressing system and a vertical prestressing system. The vertical prestressing system is vertically installed at the top of the stiffening wall 23 away from the wind turbine blades and at the top of the enclosed wall 22. If the base 2 is equipped with an overhanging wall 24, it is simultaneously installed at the top of the stiffening wall 23, the enclosed wall 22, and the overhanging wall 24. The longitudinal prestressing system is parallel to the ground and is longitudinally installed at both ends of the upper part of the stiffening wall 23. Specifically:

[0118] The base 2 includes two sets of prestressed components 3 and two sets of prestressing tendons 4. Each set of prestressed components 3 includes two fasteners 31. One fastener 31 of the first set of prestressed components 3 is located on the top side of the junction of the stiffening wall 23 and the closing wall 22, and the other fastener 31 is located inside the base plate 1. If the base 2 is provided with an overhanging wall 24, the fastener 31 is located at the top of the stiffening wall 23, the closing wall 22, and the overhanging wall 24. The first set of prestressing tendons 4 passes through the base 2 and the base plate 1 to connect the two fasteners 31. The prestressing tendons 4 are composed of 2-10 bundles of prestressed steel strands or prestressed anchor bolts. The two fasteners 31 of the second set of prestressed components 3 are respectively located on the front and rear sides of the base 2, and the second set of prestressing tendons 4 passes through the anchoring wall 21, the stiffening wall 23, and the closing wall 22 in sequence to connect the two fasteners 31.

[0119] Please refer to Figure 8 as well as Figure 9The fixing component 31 includes an anchor block 311 and a fixing anchor 312; the anchor block 311 is disposed on the surface of the base 2; the fixing anchor 312 is disposed within the anchor block 311, within the base 2, or within the bottom plate 1; two opposing fixing anchors 312 are connected by prestressed tendons 4. The anchor block 311 is a reinforced concrete structure, including a steel plate 3111 and anchoring reinforcing bars 3112; the steel plate 3111 is disposed on the surface of the base 2; one end of the anchoring reinforcing bar 3112 passes through the steel plate 3111 and connects to the base 2; for example, one end of the anchoring reinforcing bar 3112 is welded to the steel plate 3111, and the remaining part is embedded in the structure of the base 2. Figure 5 As shown, the top of the base 2 is provided with two sets of anchor blocks 311. Steel plates 3111 are set on the upper surfaces of the stiffening wall 23, the closed wall 22, and the cantilever wall 24, and anchor bars 3112 penetrate through the stiffening wall 23, the closed wall 22, and the cantilever wall 24. Simultaneously, steel plates 3111 are also provided at both the front and rear ends of the upper part of the two stiffening walls 23. The anchor bars 3112 at the front end penetrate through the anchor wall 21 and the stiffening wall 23, and the anchor bars 3112 at the rear end penetrate through the closed wall 22 and the stiffening wall 23. The number of fixed anchors 312 and prestressed tendons 4 can be set according to the actual situation.

[0120] In summary, the construction method of the box-type wind turbine blade static load test bench provided by this invention uses an anchor wall, a closed wall, and two stiffening walls to form a box-type base. The stiffening and closed walls increase the cross-sectional modulus of the base, and the box-type structure improves the base's bending and torsional load-bearing capacity. Simultaneously, the base uses a fiber-reinforced concrete structure, increasing its crack resistance. A construction doorway is provided near the top of the closed wall, and mounting holes are provided in the anchor wall for installing the wind turbine blades and the test motor, thus facilitating construction. Furthermore, the mounting hole angle is set at 10°-25°, allowing the wind turbine blades to initially tilt upwards to a higher height, preventing them from drooping and hitting the ground, thus avoiding damage. The prestressed tendons not only improve the fatigue and crack resistance of the base but also reduce the number of reinforcing bars required, making construction easier.

[0121] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for constructing a static load test bench for box-type wind turbine blades, characterized in that, include: Pre-embed fasteners in the foundation slab and install prestressed tendon corrugated pipes; Concrete is poured into the foundation slab and cured to form the foundation slab. The truss required for the anchor cage is installed on the base plate; Prestressed steel strands and prestressed tendon corrugated pipes are installed on the fixed dynamic load test bench. The base reinforcement bars are tied and fixed in layers, and the steel formwork for the construction ducts is installed and fixed. The base is poured in sections from the bottom surface of the base plate to the center of the cylinder of the truss and the predetermined base height to form a base with a box-shaped structure; and a construction doorway is formed on the base. Two sets of prestressed components are respectively installed in the vertical and longitudinal directions of the base and connected to two sets of prestressed tendons; The two sets of prestressing tendons are tensioned alternately according to a preset tensioning sequence, so that the prestress of the two sets of prestressing tendons reaches 30%, 60% and 100% of the specified tension stress in sequence; The segmented pouring construction from the bottom surface of the base plate to the center of the cylinder of the truss and the preset base height includes: Construction of the cylindrical section from the bottom surface of the base plate to the center of the truss; The truss is constructed by pouring concrete from the center of the cylindrical section to the top section of the truss. The truss is poured from its top section to the pre-set base height. The base includes an anchoring wall, a closed wall, and a box-shaped structure enclosed by two stiffening walls; The base forming the box-shaped structure includes: The anchor wall, stiffening wall and sealing wall are formed simultaneously through the pouring construction, and an installation hole is formed in the anchor wall and a construction doorway is formed in the sealing wall. The mounting holes are used to install the fan blades and the experimental motor; The base forming the box-shaped structure also includes: An outward-projecting wall is formed on the outer side of the stiffening wall; The cantilever wall and the closed wall are formed on the same plane, and the thickness and height of the cantilever wall are the same as those of the closed wall.

2. The method for constructing a static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The length of the cantilevered wall shall not exceed a preset value; The preset value is one-quarter of the shortest distance from the outer side of the stiffening wall to the symmetrical plane of the two stiffening walls.

3. The method for constructing a static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The construction opening is formed on the central axis along the length of the enclosed wall; The distance from the top surface of the construction portal to the top surface of the enclosed wall is not less than twice the thickness of the stiffening wall.

4. The method for constructing a box-type wind turbine blade static load test bench according to claim 1, wherein the base forming the box-type structure comprises: The distance from the end of the stiffening wall away from the anchor wall to the anchor wall is set to 1 / 3 to 1 / 2 of the height of the anchor wall.

5. The method for constructing a static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The base forming the box-shaped structure includes: The outer side of the anchoring wall forms an angle of 65°-80° with the plane of the base plate; The central axis of the mounting hole forms an angle of 10°-25° with the plane of the base plate.

6. The method for constructing a static load test bench for box-type wind turbine blades according to claim 1, characterized in that, The provision of two sets of prestressed components in the vertical and longitudinal directions of the base and their connection to two sets of prestressed tendons includes: Each set of the prestressed components includes two fasteners; One of the fasteners of the first set of prestressed components is set on the top side of the junction of the stiffening wall and the closed wall, and the other fastener is a pre-embedded fastener; the two fasteners are connected by the first set of prestressed tendons passing through the base and the bottom plate; The two fasteners of the second set of prestressed components are respectively set on the front and rear sides of the base, and the two fasteners are connected by the second set of prestressed tendons passing through the anchor wall, stiffening wall and closing wall in sequence.

7. The method for constructing a static load test bench for box-type wind turbine blades according to claim 6, characterized in that, The fastener includes an anchor block and a fixing anchor. The anchor block is disposed on the surface of the base; The fixed anchor is disposed in one of the anchor block, the base, or the bottom plate; The two oppositely positioned fixed anchors are connected by the prestressed tendons.

8. A structure for a static load test bench for box-type wind turbine blades, characterized in that, The structure is constructed based on the construction method of the box-type wind turbine blade static load test bench according to any one of claims 1-7. The structure includes a base plate, a base, three sets of prestressed components, and three sets of prestressed tendons; the base is made of fiber concrete. The base is disposed on the bottom plate, and the base includes an anchor wall and stiffening walls disposed on both sides of the anchor wall; the anchor wall is provided with mounting holes for mounting fan blades and experimental motors; Each of the prestressed components includes two fasteners; The two fasteners of the first group of prestressed components are respectively disposed on the top side of the stiffening wall and inside the base plate. The prestressed tendons of the first group pass through the base plate and the base to connect the two fasteners. The two fasteners of the second set of prestressed components are respectively disposed on the left and right sides of the base, and the prestressed tendons of the second set pass through the base to connect the two fasteners. The two fasteners of the third group of prestressed components are respectively disposed on the front and rear sides of the base, and the prestressed tendons of the third group pass through the base to connect the two fasteners.

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