Construction method of fan blade dynamic load experiment table

Abstract

The invention discloses a construction method of a fan blade dynamic load experiment table, which comprises the following steps of: pre-burying a fixing piece in a bottom plate foundation, and arranging a prestressed tendon corrugated pipe; concrete is poured into the bottom plate foundation, curing is completed, and the bottom plate is formed; a truss required by the anchor bolt cage is arranged on the bottom plate; installing and fixing a prestressed steel strand and a prestressed tendon corrugated pipe of the dynamic load test bed; base steel bars are bound and fixed in a layered mode, and a construction hole channel steel formwork is installed and fixed; pouring construction is conducted from the bottom face of the bottom plate to the truss and the preset height area in sequence, and a base is formed; three groups of prestressed components are respectively arranged in three axial directions of the base and are connected with the three groups of prestressed tendons; and the three sets of prestressed tendons are alternately tensioned according to a preset tensioning sequence, so that the prestress of the three sets of prestressed tendons sequentially reaches 30%, 60% and 100% of the specified tensioning stress. The anti-fatigue performance and the anti-cracking performance of the base are improved in three directions, and the overall mechanical property of the base is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan blade fixing, in particular to a construction method of a fan blade dynamic load test bed. BACKGROUND

[0002] With the continuous development of offshore wind farms, the single machine capacity of offshore wind farms is increasing, and the size of the fan blade also needs to increase, and the working conditions of the wind field are becoming more and more complex. Before the new type of blade is put into production and use, a large number of blade static load and dynamic load experiments need to be carried out on the blade loading test bed to simulate the actual load condition of the blade and ensure its safety.

[0003] In the fan blade test bed, the base is usually used as the connection point of the blade and the test bed, and the blade root is anchored on the base, and the displacement of the motor is controlled to achieve the purpose of controlling the blade loading load. However, with the increase of the size of the fan blade, the current support structure is difficult to effectively support the fan blade. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a construction method of a fan blade dynamic load test bed, which improves the overall stress performance of the device.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is: A construction method of a fan blade dynamic load test bed, the method comprising: Embedding a fixing part in the bottom plate foundation, and arranging a prestressed tendon corrugated pipe; Pouring concrete in the bottom plate foundation and completing maintenance to form the bottom plate; Arranging a truss required for the anchor cage on the bottom plate; Installing prestressed steel strands and prestressed tendon corrugated pipes of the dynamic load test bed; Layered binding and fixing the base steel reinforcement, and installing and fixing the construction hole steel formwork; Pouring and constructing from the bottom surface of the bottom plate to the truss and the preset height area in sequence to form the base; Arranging three groups of prestressed components in three axial directions of the base and connecting them with three groups of prestressed tendons; Alternately tensioning the three groups of prestressed tendons in the preset tensioning sequence, so that the prestress of the three groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress in sequence.

[0006] The beneficial effects of the present application are that: by embedding the fixing part in the bottom plate foundation, and setting the truss, prestressed steel strand and prestressed tendon corrugated pipe required by the anchor cage on the bottom plate, forming the base through pouring construction, and setting three groups of prestressed components in three axial directions of the base and connecting with three groups of prestressed tendons, the fatigue resistance and crack resistance of the base in vertical, horizontal and longitudinal directions are improved, the overall mechanical properties of the base are good, and the overall stress performance of the structure is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 A step flow chart of the construction method of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 2 A top view of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 3 A side view of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 4 A top view of the fixing part of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 5 A side view of the fixing part of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 6 A front view of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 7 An anchor cage installation truss schematic diagram of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. Figure 8 An application schematic diagram of the fan blade dynamic load test bench in the embodiment of the present application is shown in the figure. REFERENCE NUMERALS: 1, bottom plate; 2, base; 21, anchor wall; 22, stiffened wall; 23, mounting hole; 231, anchor hole group; 232, construction hole; 3, prestressed component; 31, fixing part; 311, anchor block; 3111, steel mesh; 3112, anchor steel; 312, fixing anchor; 4, prestressed tendon; 41, vertical prestressed tendon; 42, horizontal prestressed tendon; 43, longitudinal prestressed tendon; 5, anchor cage installation truss; 6, lock device. DETAILED DESCRIPTION

[0008] To explain the technical content, the purposes and effects of the present application in detail, the following will be described in combination with the embodiments and the accompanying drawings.

[0009] In the fan blade test scene, the base force transmission mechanism is complex, and it bears the cyclic test load of compression, bending, shearing and torsion, so whether the base structure is stressed reliably is the key to the safety of the test bench. The base is the most concentrated area of the test bench to bear the test load. Under the cyclic loading of compression, bending, shearing and torsion, the stress amplitude of the base needs to be strictly controlled to avoid fatigue failure. At the same time, with the continuous increase in the size of new fan blades, the test loading also needs to be continuously increased, and a way needs to be found to control the internal force to control the concrete cracks. Based on the above requirements, the present application proposes a fan blade test bench base structure using a three-way prestressed system, as follows: A construction method of a fan blade dynamic load test bench, comprising: Embedding a fixing part in the bottom plate foundation, and setting a prestressed tendon corrugated pipe; Pouring concrete in the bottom plate foundation and completing maintenance to form the bottom plate; Setting a truss required for an anchor cage on the bottom plate; Installing prestressed steel strands and prestressed tendon corrugated pipes of the dynamic load test bench; Layered binding and fixing the base steel bars, and installing and fixing the construction hole steel formwork; Pouring and constructing from the bottom surface of the bottom plate to the truss and the preset height area to form the base; Setting three groups of prestressed components in three axial directions of the base and connecting them with three groups of prestressed tendons; Alternately tensioning the three groups of prestressed tendons in a preset tensioning sequence, so that the prestress of the three groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress in turn.

[0010] As can be seen from the above description, the beneficial effects of the present application are that after embedding a fixing part in the bottom plate foundation, and setting a truss required for an anchor cage, prestressed steel strands and prestressed tendon corrugated pipes and other structures on the bottom plate, the base is formed by pouring and constructing, and three groups of prestressed components are set in three axial directions of the base and connected with three groups of prestressed tendons, so that the fatigue resistance and crack resistance of the base are improved in the vertical, horizontal and longitudinal directions, the overall mechanical properties of the base are good, and the overall stress performance of the structure is enhanced.

[0011] The pouring and constructing from the bottom surface of the bottom plate to the truss and the preset height area comprises: Pouring and constructing from the bottom surface of the bottom plate to the cylindrical center section of the truss; Pouring and constructing from the cylindrical center of the truss to the top section of the truss; Pouring and constructing from the top section of the truss to the preset height area to form the base.

[0012] As can be seen from the above description, by sequentially performing three times of segmental pouring construction, the base structure can be effectively formed, and the mounting hole and other structures on the base are formed, thereby ensuring the strength of the base structure.

[0013] Further, the base comprises an anchoring wall and stiffening walls arranged on both sides of the anchoring wall. The forming of the base comprises: The anchoring wall and the stiffening walls are simultaneously formed by pouring construction, and the mounting hole is formed in the anchoring wall. The mounting hole is used for mounting the fan blade and the experimental motor.

[0014] As can be seen from the above description, by forming the base by the anchoring wall and the stiffening walls arranged on both sides of the anchoring wall, the structural cross-section resisting moment of the base is improved.

[0015] Further, the simultaneous forming of the anchoring wall and the stiffening walls by pouring construction comprises: The cross-section of the stiffening wall and the anchoring wall is formed in a concave shape by pouring construction.

[0016] As can be seen from the above description, by forming the concave structure by the perpendicular arrangement of the stiffening wall and the anchoring wall, the stability of the base structure is enhanced.

[0017] Further, the simultaneous forming of the anchoring wall and the stiffening walls by pouring construction comprises: The distance from the end of the stiffening wall away from the anchoring wall to the anchoring wall is set to 1 / 4-1 / 2 of the height of the anchoring wall.

[0018] As can be seen from the above description, by setting the distance from the end of the stiffening wall away from the blade to the anchoring wall to 1 / 4-1 / 2 of the height of the anchoring wall, the specific size of the distance can conform to the bending and torsional bearing capacity calculation results of the base under dynamic load, thereby improving the stress performance of the base.

[0019] Further, the simultaneous forming of the anchoring wall by pouring construction comprises: An included angle of 80°-85° is formed between the plane of the anchoring wall and the plane of the bottom plate, and an included angle of 5°-10° is formed between the central axis of the mounting hole and the plane of the bottom plate.

[0020] As can be seen from the above description, by forming an included angle of 85°-80° between the plane of the anchoring wall and the plane of the bottom plate, and an included angle of 5°-10° between the central axis of the mounting hole and the plane of the bottom plate, i.e. the mounting surface of the anchoring wall is inclined upward, since the fan blade oscillates up and down and left and right during testing; therefore, the mounting surface of the anchoring wall is inclined upward, so that the fan blade is installed upward, which can reduce the height of the base, thereby reducing the cost.

[0021] Further, the three groups of prestressed components are arranged in three axial directions of the base respectively and connected with three groups of prestressed tendons, which comprises: Each of the prestressed components comprises two fixing members; One of the fixing members of the first group of prestressed components is arranged on the top side of the stiffened wall, and the other fixing member of the first group of prestressed components is a pre-buried fixing member; the two fixing members are connected by the first group of prestressed tendons penetrating through the bottom plate and the base; The two fixing members of the second group of prestressed components are arranged on the left and right sides of the base respectively, and the two fixing members are connected by the second group of prestressed tendons penetrating through the base; The two fixing members of the third group of prestressed components are arranged on the front and back sides of the base respectively, and the two fixing members are connected by the third group of prestressed tendons penetrating through the base.

[0022] As can be seen from the above description, by arranging two fixing members for each prestressed component and arranging the fixing members in the vertical, horizontal and longitudinal directions of the base, and connecting them by three groups of prestressed tendons respectively, the fatigue resistance and crack resistance of the base in the vertical, horizontal and longitudinal directions are improved, the overall mechanical properties of the base are good, and the overall stress performance of the structure is enhanced.

[0023] Further, the fixing member comprises an anchoring block and a fixing anchor; the anchoring block is arranged on the surface of the base; the fixing anchor is arranged in the anchoring block, the base or the bottom plate; and the two oppositely arranged fixing anchors are connected by the prestressed tendon.

[0024] As can be seen from the above description, by using the anchoring block and the fixing anchor to fix the prestressed tendon, the installation of the prestressed tendon under different installation requirements can be met.

[0025] Further, the anchoring block comprises a steel mesh and an anchoring steel bar; the steel mesh is arranged on the surface of the base; and one end of the anchoring steel bar penetrates through the steel mesh and is connected with the base.

[0026] As can be seen from the above description, by using the steel mesh and the anchoring steel bar to form the anchoring block, the steel mesh can be effectively arranged on the surface of the base by fixing it with the anchoring steel bar, thereby fixing the fixing anchor.

[0027] As can be seen from the above description, the mounting hole comprises an anchor hole group and a construction hole; The construction hole is formed at the geometric center of the anchoring wall and is used for arranging an experimental motor. The anchor hole group is an annular hole array arranged around the construction hole and used for connecting with the anchor cage at the root of the fan blade.

[0028] From the above description, it can be known that the anchor hole group can be effectively connected with the fan blade, and the construction hole can be used for the experimental motor, thereby meeting the experimental demand for the fan blade.

[0029] The construction method of the fan blade dynamic load test bench provided by the application can be applied to the scene where the fan blade is fixed in a dynamic load mode, and the following will be described through specific embodiments. Embodiment one Please refer to Figure 1 A construction method of a fan blade dynamic load test bench, comprising: S1, embedding a fixing member 31 in a base plate 1 and arranging a prestressed tendon 4 corrugated pipe.

[0030] S2, pouring concrete in the base plate 1 and completing maintenance to form the base plate 1.

[0031] S3, arranging a truss required by the anchor cage on the base plate 1, that is, hoisting and placing the steel structure truss required by the anchor cage.

[0032] S4, installing the prestressed steel strand and the prestressed tendon 4 corrugated pipe of the dynamic load test bench, that is, completing the installation and fixation of the prestressed steel strand, the transverse prestressed tendon corrugated pipe and the longitudinal prestressed tendon corrugated pipe of the dynamic load test bench.

[0033] S5, layer-by-layer binding and fixing the base 2 steel reinforcement and installing and fixing the construction hole 232 steel formwork. S6, pouring and constructing from the bottom surface of the base plate 1 to the preset height area through the truss to form the base 2, in particular: S61, pouring and constructing from the bottom surface of the base plate 1 to the cylindrical center section of the truss. S62, pouring and constructing from the cylindrical center of the truss to the top section of the truss. S63, pouring and constructing from the top section of the truss to the preset height area to form the base 2. The base 2 comprises an anchoring wall 21 and stiffening walls 22 arranged on both sides of the anchoring wall 21. When the base 2 is formed, the anchoring wall 21 and the stiffening walls 22 are formed by pouring and constructing, and the installation hole 23 is formed in the anchoring wall 21. The installation hole 23 is used for installing the fan blade and the experimental motor. The cross section of the stiffening wall 22 and the anchoring wall 21 forms a concave shape. The distance from the end of the stiffening wall 22 away from the anchoring wall 21 to the anchoring wall 21 is set to 1 / 4-1 / 2 of the height of the anchoring wall 21.

[0034] The included angle between the anchoring wall 21 plane and the bottom plate 1 plane is 80°-85°, and the included angle between the central axis of the mounting hole 23 and the bottom plate 1 plane is 5°-10°. The mounting hole 23 includes an anchor hole group 231 and a construction hole 232; the construction hole 232 is formed at the geometric center of the anchoring wall 21 for setting an experimental motor; the anchor hole group 231 is an annular array of circular holes arranged around the construction hole 232 for connecting with the fan blade root anchor cage.

[0035] S7, three groups of prestressed components 3 are arranged in three axial directions of the base 2 respectively and connected with three groups of prestressed tendons 4; wherein each prestressed component 3 includes two fixing members 31, and the prestressed tendons 4 include vertical prestressed tendons 41, horizontal prestressed tendons 42 and longitudinal prestressed tendons 43, and the specific arrangement is as follows: One of the fixing members 31 of the first group of prestressed components 3 is arranged at the top side of the stiffening wall 22, and the other fixing member 31 of the first group of prestressed components 3 is a pre-buried fixing member 31; two fixing members 31 are connected by vertical prestressed tendons 41 penetrating through the bottom plate 1 and the base 2; Two fixing members 31 of the second group of prestressed components 3 are arranged on the left and right sides of the base 2 respectively, and two fixing members 31 are connected by horizontal prestressed tendons 42 penetrating through the base 2; Two fixing members 31 of the third group of prestressed components 3 are arranged on the front and back sides of the base 2 respectively, and two fixing members 31 are connected by longitudinal prestressed tendons 43 penetrating through the base 2.

[0036] Wherein, the fixing member 31 includes an anchoring block 311 and a fixed anchor 312; the anchoring block 311 is arranged on the surface of the base 2; the fixed anchor 312 is arranged in the anchoring block 311, the base 2 or the bottom plate 1; two opposite fixing anchors 312 are connected by the prestressed tendons 4. The anchoring block 311 includes a steel mesh 3111 and an anchoring steel bar 3112; the steel mesh 3111 is arranged on the surface of the base 2; one end of the anchoring steel bar 3112 penetrates through the steel mesh 3111 and is connected with the base 2.

[0037] S8, the three groups of prestressed steel bars 4 are alternately tensioned according to the preset tensioning sequence, so that the prestress of the three groups of prestressed steel bars 4 reaches 30%, 60% and 100% of the specified tensioning stress in turn. Specifically, for example, the prestress is alternately tensioned to 30% of the specified tensioning stress in the order of longitudinal, transverse and vertical directions. Then, the prestress is alternately tensioned to 60% of the specified tensioning stress in the order of longitudinal, transverse and vertical directions. Finally, the prestress is alternately tensioned to the specified tensioning stress in the order of longitudinal, transverse and vertical directions.

[0038] Please refer to Figures 2 to 8 The fan blade dynamic load test bench structure formed by the above fan blade dynamic load test bench construction method is specific. The fan blade dynamic load test bench comprises a bottom plate 1, a base 2, three groups of prestressed components 3 and three groups of prestressed steel bars 4. The base 2 is arranged on the bottom plate 1, and the base 2 comprises an anchoring wall 21 and stiffening walls 22 arranged on both sides of the anchoring wall 21. In this embodiment, the anchoring wall 21 and the stiffening walls 22 are reinforced concrete structures, and the three walls together form the main body of the base 2. The anchoring wall 21 is provided with mounting holes 23 for mounting a fan blade and a test motor. Each prestressed component 3 comprises two fixing members 31. The two fixing members 31 of the first group of prestressed components 3 are arranged on the top side of the stiffening wall 22 and in the bottom plate 1 respectively, and the first group of prestressed steel bars 4 connects the two fixing members 31 by penetrating the bottom plate 1 and the base 2. The two fixing members 31 of the second group of prestressed components 3 are arranged on the left and right sides of the base 2 respectively, and the second group of prestressed steel bars 4 connects the two fixing members 31 by penetrating the base 2. The two fixing members 31 of the third group of prestressed components 3 are arranged on the front and rear sides of the base 2 respectively, and the third group of prestressed steel bars 4 connects the two fixing members 31 by penetrating the base 2. The prestressed steel bars 4 can be prestressed steel strands or prestressed anchors. That is, the three groups of prestressed components 3 and the three groups of prestressed steel bars 4 cooperate to form a transverse prestressed system, a longitudinal prestressed system and a vertical prestressed system. If the front of the anchoring wall 21 is the positive direction, the first group of prestressed components 3 is the vertical prestressed system, the second group of prestressed components 3 is the longitudinal prestressed system, and the third group of prestressed components 3 is the transverse prestressed system.

[0039] As Figure 2 and Figure 3As shown in the drawings, the plane of the stiffening wall 22 is perpendicular to the plane of the anchoring wall 21; the cross section of the stiffening wall 22 and the anchoring wall 21 is in the shape of a concave letter; that is, the stiffening wall 22 is arranged on both sides of the rear of the anchoring wall 21 and is located on the opposite side of the blade. At the same time, the angle a between the plane of the anchoring wall 21 and the plane of the bottom plate 1 is 80°-85°, and the angle between the central axis of the mounting hole 23 and the plane of the bottom plate 1 is 5°-10°; for example, according to the size of the blade, the angle a between the plane of the anchoring wall 21 and the plane of the bottom plate 1 is adjusted, such as when the size of the fan blade is large, the angle a is reduced, that is, the angle between the mounting hole 23 and the plane of the bottom plate 1 is increased; such as when the size of the fan blade is small, the angle a is increased, that is, the angle between the mounting hole 23 and the plane of the bottom plate 1 is reduced; preferably 85°; that is, the top of the anchoring wall 21 is a vertical surface, and the side connected with the bottom plate 1 is an inclined surface; or the whole anchoring wall 21 is an inclined surface; or the outer side of the anchoring wall 21 is arranged as an inclined surface, and the inner side is a vertical surface. The distance from the end of the stiffening wall 22 away from the anchoring wall 21 to the anchoring wall 21 is 1 / 4-1 / 2 of the height of the anchoring wall 21, and the specific size of the distance is adjusted according to the calculation results of the bending and torsional bearing capacity of the base 2.

[0040] Please refer to Figure 4 and Figure 5 The fixing member 31 includes an anchoring block 311 and a fixing anchor 312; the anchoring block 311 is arranged on the surface of the base 2; the fixing anchor 312 is arranged in the anchoring block 311, in the base 2 or in the bottom plate 1; two oppositely arranged fixing anchors 312 are connected by the prestressed tendon 4. Among them, the anchoring block 311 is a reinforced concrete structure, which is fixed by the steel mesh 3111 and the anchoring steel bar 3112; the steel mesh 3111 is arranged on the surface of the base 2; one end of the anchoring steel bar 3112 is connected with the base 2 through the steel mesh 3111. In a specific embodiment, the fixing member 31 includes 4-10 fixing anchors 312; as shown in Figure 3 In a vertical prestressed system on one side, a total of 5 fixing anchors 312 are arranged, forming 5 prestressed tendons 4.

[0041] The specific arrangement of the fixing member 31 is as follows: In the vertical prestressed system, one anchoring block 311 is arranged on the upper surface of the middle part of the stiffening wall 22; one group of fixing anchors is arranged in the anchoring block 311, and the other group of fixing anchors is arranged in the bottom plate 1, the two groups of fixing anchors are connected by the prestressed tendon 4 and are perpendicular to the bottom plate 1. As shown in Figure 2 A group of vertical prestressed systems are arranged on the left and right stiffening walls 22.

[0042] In the longitudinal prestress system, two anchoring blocks 311 are included, which are respectively arranged at the upper end of the front and rear vertical faces of the stiffening wall 22; the fixed anchors are arranged in the anchoring blocks 311, and the two groups of fixed anchors are connected through the prestressed tendons 4.

[0043] In the transverse prestress system, two anchoring blocks 311 are included, which are respectively arranged at the upper end of the left and right two stiffening walls 22 and located in the middle region; the fixed anchors are arranged in the anchoring blocks 311, and the two groups of fixed anchors are connected through the prestressed tendons 4.

[0044] Please refer to Figure 6 , the mounting hole 23 includes an anchor hole group 231 and a construction hole 232; the construction hole 232 is arranged at the geometric center of the anchoring wall 21 and is used for arranging a test motor; the anchor hole group 231 is an annular circular hole array arranged around the construction hole 232 and is used for being connected with a fan blade root anchor cage; after the fan blade root anchor cage passes through the anchor hole, the anchor cage is clamped between the front and rear two faces of the anchoring wall 21 to form a fixation. Please refer to Figure 6 , an anchor cage mounting truss 5 is further arranged, the anchor cage mounting truss 5 is welded by angle steels, and a construction hole 232 steel construction hole 232 steel formwork is arranged and welded at the middle position.

[0045] Please refer to Figure 8 , the bottom plate 1 is further provided with a zipper device 6; the zipper device 6 is used for being connected with the fan blade.

[0046] In summary, the construction method of the fan blade dynamic load test bench provided by the application forms a base through the anchoring wall and the stiffening walls on the two sides of the anchoring wall, improves the structural cross section resisting moment of the base, arranges three groups of prestress assemblies in different directions of the base, and forms a three-way prestress system through the three groups of prestressed tendons, so that the fatigue resistance and crack resistance of the base are improved in the vertical, transverse and longitudinal directions, the overall mechanical properties of the base are good, and the overall stress performance of the structure is improved. Moreover, the arrangement of the prestressed tendons not only improves the fatigue resistance and crack resistance of the base, but also greatly reduces the number of steel bars, and is more convenient for construction.

[0047] The above description is only an embodiment of the application, and does not limit the patent range of the application, and any equivalent transformation or direct or indirect application in the related technical field by using the content of the specification and the drawings is also included in the patent protection range of the application.

Claims

1. A construction method for a wind turbine blade dynamic load test bench, characterized in that: include: Embed fixed parts in the base plate foundation and set prestressed tendon bellows; pouring concrete in the base plate foundation and completing curing to form the base plate; arranging the trusses required for the anchor cage on the base plate; Install the prestressed steel strands and prestressed tendon bellows for the fixed dynamic load test bench; Tie and secure the foundation reinforcement in layers, and install and secure the construction channel steel formwork; Casting is performed from the bottom surface of the base plate to the truss and the preset height area in sequence to form a base; Three groups of prestressed components are respectively arranged in three axial directions of the base and connected with three groups of prestressed tendons; The three groups of prestressed tendons are tensioned alternately in a preset tensioning sequence so that the prestress of the three groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress respectively.

2. The construction method of a wind turbine blade dynamic load test bench according to claim 1, characterized in that: The pouring construction from the bottom surface of the base plate to the truss and the preset height area in sequence includes: Casting construction from the bottom surface of the base plate to the cylindrical center section of the truss; Casting construction from the cylinder center of the truss to the top section of the truss; The base is formed by pouring from the top section of the truss to the preset height area.

3. The construction method of a wind turbine blade dynamic load test bench according to claim 2, characterized in that: The base includes an anchor wall and stiffening walls arranged on both sides of the anchor wall; The forming of the base comprises: The anchor wall and the stiffening wall are simultaneously formed by pouring construction, and a mounting hole is formed in the anchor wall; The mounting holes are used to mount fan blades and an experimental motor.

4. The construction method of a wind turbine blade dynamic load test bench according to claim 3 is characterized in that: The simultaneous formation of the anchor wall and the stiffening wall by pouring construction comprises: The cross sections of the reinforcing wall and the anchoring wall are formed into a concave shape through pouring construction.

5. The construction method of a wind turbine blade dynamic load test bench according to claim 3 is characterized in that: The simultaneous formation of the anchor wall and the stiffening wall by pouring construction comprises: The distance from one end of the reinforcing wall away from the anchoring wall to the anchoring wall is set to 1 / 4-1 / 2 of the height of the anchoring wall.

6. The construction method of a wind turbine blade dynamic load test bench according to claim 3, characterized in that: The forming of the anchor wall by pouring construction comprises: An angle of 80°-85° is formed between the plane of the anchoring wall and the plane of the bottom plate, and an angle of 5°-10° is formed between the central axis of the mounting hole and the plane of the bottom plate.

7. The construction method of a wind turbine blade dynamic load test bench according to claim 3, characterized in that: The three sets of prestressed components are respectively provided in the three axial directions of the base and connected with the three sets of prestressed tendons, comprising: Each of the prestressed components includes two fixing members; One of the fixing members of the first group of prestressed components is arranged on the top side of the stiffening wall, and the other fixing member of the first group of prestressed components is a pre-buried fixing member; the two fixing members are connected by the first group of prestressed tendons penetrating the bottom plate and the base; The two fixing members of the second group of prestressed components are respectively arranged on the left and right sides of the base, and the two fixing members are connected by the second group of prestressed tendons penetrating the base; The two fixing members of the third group of prestressed components are respectively arranged on the front and rear sides of the base, and the two fixing members are connected by the third group of prestressed tendons passing through the base.

8. The construction method of a wind turbine blade dynamic load test bench according to claim 7, characterized in that: The fixing member includes an anchor block and a fixing anchor; The anchor block is used to be arranged on the surface of the base; The fixing anchor is used to be arranged in the anchor block, the base or the bottom plate; The two oppositely arranged fixing anchors are connected via the prestressed tendons.

9. The construction method of a wind turbine blade dynamic load test bench according to claim 8, characterized in that: The anchor block includes a steel mesh and anchor steel bars; The steel mesh is used to be arranged on the surface of the base; One end of the anchoring steel bar passes through the steel mesh and is connected to the base.

10. The construction method of a wind turbine blade dynamic load test bench according to claim 3, characterized in that: The installation holes include anchor hole groups and construction holes; The construction channel is formed at the geometric center of the anchor wall and is used to set up the experimental motor; The anchor hole group is an annular circular hole array arranged with the construction channel as the center, and is used to connect with the anchor cage at the root of the wind turbine blade.

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