Construction method of box-type fan blade static load test bench

Abstract

The invention discloses a structure of a box-type fan blade static load test bench and a construction method thereof. The construction method comprises the following steps: 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 a 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; performing segmented pouring construction from the bottom surface of the bottom plate to the cylinder center of the truss at a preset base height in sequence to form a base with a box-shaped structure; a construction door opening is formed in the base; two groups of prestressed components are respectively arranged in the vertical direction and the longitudinal direction of the base and are connected with the two groups of prestressed tendons; and the two sets of prestressed tendons are alternately tensioned according to a preset tensioning sequence, so that the prestress of the two sets of prestressed tendons sequentially reaches 30%, 60% and 100% of the specified tensioning stress. And the bending-resistant and torsion-resistant bearing capacity of the base is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a wind turbine blade fixing technology field, in particular to a construction method of a box-type wind turbine blade static load test bed. BACKGROUND

[0002] With the continuous development of new energy, wind turbine power generation is also developing towards large single machine capacity, so that the size of the wind turbine blade is continuously increasing. Before the wind turbine blade is put into production and use, the blade needs to be subjected to a large amount of static load and dynamic load experiments on the test bed.

[0003] In the wind turbine blade test bed, the base is usually used as the connecting point of the blade and the test bed, the blade root is anchored on the base, and the displacement of the control motor is controlled to achieve the purpose of controlling the blade load. Therefore, the base is the most concentrated area of the test bed to bear the test load. With the continuous increase in the size of the new wind turbine blade, under the combined loading of compression, bending, shear and torsion, a base structure form with high integrity and convenient construction needs to be proposed. SUMMARY

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

[0005] To solve the above technical problems, the technical scheme adopted by the application is: A construction method of a box-type wind turbine blade static load test bed, comprising: Embedding a fixing member 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 an anchor cage on the bottom plate; Installing prestressed steel strands and prestressed tendon corrugated pipes of a dynamic load test bed; Layered binding and fixing the base steel bars, and installing and fixing the construction hole steel formwork; Segmented pouring construction is performed from the bottom surface of the bottom plate to the center of the cylinder of the truss and the preset base height to form a base with a box structure; and a construction door opening is formed on the base Two groups of prestressed components are arranged in the vertical direction and the longitudinal direction of the base respectively and connected with two groups of prestressed tendons; The two groups of prestressed tendons are alternately tensioned in a preset tensioning sequence, so that the prestress of the two groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress in sequence.

[0006] To solve the above technical problems, the technical scheme adopted by the application is: The application discloses a structure of a box-type fan blade static load test bed, which comprises a bottom plate, a base, three groups of prestressed components and three groups of prestressed tendons. The base is arranged on the bottom plate, and the base comprises an anchoring wall and stiffening walls arranged on both sides of the anchoring wall; the anchoring wall is provided with mounting holes for mounting fan blades and experimental motors; Each of the prestressed components comprises two fixing members; The two fixing members of the first group of prestressed components are arranged on the top side of the stiffening wall and in the bottom plate respectively, and the first group of prestressed tendons connects the two fixing members by penetrating 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 second group of prestressed tendons connects the two fixing members by penetrating 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 third group of prestressed tendons connects the two fixing members by penetrating the base.

[0007] The application has the beneficial effects that: by pre-burying fixing members in the bottom plate foundation and arranging structures such as trusses, prestressed steel strands and prestressed tendon corrugated pipes required by the anchoring cage on the bottom plate, the base with a box structure is constructed by pouring, the box structure can improve the bending and torsional bearing capacity of the base; a construction door opening is formed on the base, so that the test personnel can test through the construction door opening; meanwhile, two groups of prestressed components are arranged in the vertical direction and the longitudinal direction respectively and connected with two groups of prestressed tendons, so that the fatigue resistance and crack resistance of the base in the vertical 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

[0008] Figure 1 It is a step flow chart of the construction method of the box-type fan blade static load test bed in the embodiment of the application; Figure 2 It is a structure schematic diagram of the box-type fan blade static load test bed in the embodiment of the application; Figure 3 It is a use structure schematic diagram of the box-type fan blade static load test bed in the embodiment of the application; Figure 4 It is a side surface cross-section structure schematic diagram of the box-type fan blade static load test bed in the embodiment of the application; Figure 5 It is a top view structure schematic diagram of the box-type fan blade static load test bed in the embodiment of the application; Figure 6It is a side view structural schematic diagram of a box type fan blade static load test bed in the embodiment of the present application. Figure 7 It is a front view structural schematic diagram of a box type fan blade static load test bed in the embodiment of the present application. Figure 8 It is a top view of a fixing member of a box type fan blade static load test bed in the embodiment of the present application. Figure 9 It is a side view of a fixing member of a box type fan blade static load test bed in the embodiment of the present application. Figure 10 It is a corrugated pipe setting schematic diagram of a box type fan blade static load test bed in the embodiment of the present application. Figure 11 It is a side view of an anchor cage installation truss installation of a box type fan blade static load test bed in the embodiment of the present application. Figure 12 It is a front view of an anchor cage installation truss installation of a box type fan blade static load test bed in the embodiment of the present application. Label explanation: 1, bottom plate; 2, base; 21, anchoring wall; 22, closed wall; 23, stiffened wall; 24, overhanging wall; 25, construction door opening; 26, mounting hole; 27, anchor hole group; 3, prestressed component; 31, fixing member; 311, anchoring block; 3111, steel plate; 3112, anchoring steel bar; 312, fixing anchor; 4, prestressed tendon; 5, anchor cage installation truss; 6, zipper device; 7, vertical corrugated pipe; 8, transverse corrugated pipe. DETAILED DESCRIPTION

[0009] In order to explain the technical content, the purpose and the effect of the present application in detail, the following will be explained in combination with the embodiments and the drawings.

[0010] A construction method of a box type fan blade static load test bed, comprising: Embedding a fixing member in a 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 by an anchor cage on the bottom plate; Installing prestressed steel strands and prestressed tendon corrugated pipes of a fixed dynamic load test bed; Layered binding and fixing of base steel bars, and installation and fixing of construction channel steel formworks; Segmented pouring construction from the bottom surface of the bottom plate to the center of the truss and the preset base height to form a base with a box type structure; and forming a construction door opening on the base; Two groups of prestress components are arranged in the vertical direction and the longitudinal direction of the base respectively and connected with two groups of prestressed tendons; The two groups of prestressed tendons are alternatively tensioned according to a preset tensioning sequence, so that the prestress of the two groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress in turn.

[0011] As can be seen from the above description, the beneficial effects of the present application are that: after embedding the fixing member in the bottom plate foundation, and arranging the truss, prestressed steel strand and prestressed tendon corrugated pipe and other structures required by the anchor cage on the bottom plate, the base with a box structure is formed by pouring construction, the box structure can improve the bending and torsional carrying capacity of the base; and the construction door opening is formed on the base, so that the operating personnel can test through the construction door opening; at the same time, two groups of prestress components are arranged in the vertical direction and the longitudinal direction respectively and connected with two groups of prestressed tendons, so that the fatigue resistance and crack resistance of the base in the vertical and longitudinal directions are improved, the overall mechanical properties of the base are good, and the overall stress performance of the structure is enhanced.

[0012] Further, the segmental pouring construction from the bottom surface of the bottom plate to the preset base height in sequence includes: segmental pouring construction from the bottom surface of the bottom plate to the cylinder center of the truss; segmental pouring construction from the cylinder center of the truss to the top of the truss; segmental pouring construction from the top of the truss to the preset base height.

[0013] 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, so as to ensure the strength of the base structure.

[0014] Further, the base comprises a box structure surrounded by an anchoring wall, a closing wall and two face stiffening walls; The base with a box structure comprises: The anchoring wall, the stiffening wall and the closing wall are simultaneously formed by pouring construction, the mounting hole is formed in the anchoring wall, and the construction door opening is formed on the closing wall; The mounting hole is used for mounting the fan blade and the experimental motor.

[0015] As can be seen from the above description, the base with a box structure composed of the anchoring wall, the closing wall and the two face stiffening walls is formed by pouring construction, the cross-sectional resisting moment of the base is improved by the stiffening wall and the closing wall, and the bending and torsional carrying capacity of the base is improved by the box structure.

[0016] Further, the base with a box structure further comprises: An overhanging wall is formed on the outer side of the stiffening wall; The overhanging wall is formed on the same plane as the enclosing wall, and the thickness and height of the overhanging wall are the same as those of the enclosing wall.

[0017] As can be seen from the above description, by forming an overhanging wall with the same thickness and height as the enclosing wall on the left and right sides of the base, and arranging the overhanging wall and the enclosing wall on the same plane, the cross-sectional moment of resistance of the base is improved, and the load-carrying capacity of the base is further improved.

[0018] Further, the length of the overhanging wall is not greater than a preset value; The preset value is one-fourth of the shortest distance from the outer side of the stiffening wall to the symmetry plane of the two stiffening walls.

[0019] As can be seen from the above description, by limiting the length of the overhanging wall, the problem of being unable to effectively withstand the cross-sectional moment of resistance due to the overhanging wall being too long, or even causing the load-carrying capacity to decrease, is avoided.

[0020] Further, the construction door opening is formed on the central axis of the length direction of the enclosing wall; The distance from the top surface of the construction door opening to the top surface of the enclosing wall is not less than twice the thickness of the stiffening wall.

[0021] As can be seen from the above description, by limiting the height of the construction door opening, the problem of the base's bending and torsional resistance being reduced due to the size of the construction door opening being too large, and being unable to effectively provide load-carrying capacity for the fan blade, is avoided.

[0022] Further, the base formed with a box structure comprises: The distance from the end of the stiffening wall away from the anchoring wall to the anchoring wall is set to 1 / 3-1 / 2 of the height of the anchoring wall.

[0023] 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 / 3-1 / 2 of the height of the anchoring wall, the specific size of the distance can meet the bending and torsional load-carrying capacity calculation results of the base under static load, thereby improving the stress performance of the base.

[0024] Further, the base formed with a box structure comprises: An included angle of 65°-80° is formed between the outer side surface of the anchoring wall and the bottom plate plane; An included angle of 10°-25° is formed between the central axis of the mounting hole and the bottom plate plane.

[0025] From the above description, by forming an angle of 65°-80° between the anchoring wall plane and the bottom plate plane, and forming an angle of 10°-25° between the central axis of the mounting hole and the bottom plate plane, i.e. the mounting surface of the anchoring wall is inclined upward, since the fan blade is oscillated up and down and left and right during the test; 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; at the same time, compared with dynamic load, the force borne by the blade is larger under static load, so the droop degree of the blade is larger, therefore, the base needs to be provided with a relatively large angle, so that the initial upward tilting height of the blade is higher, and the blade is prevented from colliding with the ground after drooping.

[0026] Further, two groups of prestressed components and two groups of prestressed tendons are further included; Each group of the prestressed components includes two fixing members; One of the fixing members of the first group of the prestressed components is arranged on the top side of the intersection of the stiffening wall and the closed wall, and the other fixing member is a pre-buried fixing member; the two fixing members are connected through the first group of the prestressed tendons penetrating the base and the bottom plate; The two fixing members of the second group of the prestressed components are arranged on the front and rear sides of the base respectively, and the two fixing members are connected through the second group of the prestressed tendons penetrating the anchoring wall, the stiffening wall and the closed wall in sequence.

[0027] From the above description, after the cross section resisting moment of the base is improved by arranging the stiffening wall and the closed wall, the fatigue resistance and crack resistance of the base in the vertical and longitudinal directions are further improved by arranging two groups of prestressed components and two groups of prestressed tendons, so that the overall mechanical properties of the base are good, thereby enhancing the overall stress performance of the structure.

[0028] Further, the fixing member includes 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; The two oppositely arranged fixing anchors are connected through the prestressed tendon.

[0029] 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.

[0030] Another embodiment of the application provides a structure of a box-type fan blade static load test bench, which comprises a bottom plate, a base, three groups of prestressed components and three groups of prestressed tendons; the base is made of fiber concrete. The base is arranged on the bottom plate, the base comprises an anchoring wall and stiffening walls arranged on both sides of the anchoring wall; the anchoring wall is provided with mounting holes for mounting fan blades and experimental motors; Each of the prestressed components comprises two fixing members; The two fixing members of the first group of prestressed components are arranged on the top side of the stiffening wall and in the bottom plate respectively, and the first group of prestressed tendons connects the two fixing members by penetrating 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 second group of prestressed tendons connects the two fixing members by penetrating 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 third group of prestressed tendons connects the two fixing members by penetrating the base.

[0031] The fan blade static load fixing device and the construction method thereof provided by the application can be applied to the scene of fixing the fan blade in a static load mode, and the following will be described through specific embodiments: Embodiment one Please refer to Figure 1 A construction method of a box-shaped fan blade static load test bench, comprising: S1, embedding fixing members 31 in the bottom plate 1 foundation and arranging prestressed tendon 4 corrugated pipes; please refer to Figure 10 That is, arranging the base 22 vertical tendon anchoring section in the bottom plate 1 foundation, and embedding the fixed section anchorage device of the vertical prestressed tendon 44 and the vertical corrugated pipe 77 of the bottom plate 1 section.

[0032] S2, pouring concrete in the bottom plate 1 foundation and completing maintenance to form the bottom plate 1; S3, arranging the required truss of anchor cage on the bottom plate 1; hoisting and positioning the required steel structure truss of anchor cage by equipment.

[0033] S4, installing prestressed steel strands and prestressed tendon 4 corrugated pipes of the static load test bench; that is, installing prestressed steel strands and transverse corrugated pipes 8 of the static load test bench; S5, layering and binding the reinforcement of the base 2, and installing and fixing the construction hole steel formwork; S6, segmentally pouring and constructing from the bottom surface of the bottom plate 1 to the center of the cylinder of the truss, and to the preset height of the base 2, to form the base 2 with a box-shaped structure; and forming a construction door opening 25 on the base 2, as shown in Figure 11 and Figure 12 The setting mode of the anchor cage installation truss 5 and the bottom plate 11 is shown, specifically: S61, pouring from the bottom surface of the bottom plate 1 to the center section of the cylinder of the truss; S62, pouring from the center section of the cylinder of the truss to the top section of the truss; the construction door hole 25 is formed on the central axis of the length direction of the enclosing wall 22; and the distance from the top surface of the construction door hole 25 to the top surface of the enclosing wall 22 is not less than twice the thickness of the stiffened wall 23.

[0034] S63, pouring from the top section of the truss to the height of the preset base 2; that is, pouring from the top section of the truss to the top area of the base 2, and completing maintenance and form removal; in the embodiment, the base 2 includes the box-shaped structure surrounded by the anchoring wall 21, the enclosing wall 22 and the two stiffened walls 23; when the base 2 with the box-shaped structure is formed, the anchoring wall 21, the stiffened wall 23 and the enclosing wall 22 are simultaneously formed by pouring, the mounting hole 26 is formed in the anchoring wall 21, and the construction door hole 25 is formed on the enclosing wall 22; the mounting hole 26 is used for mounting the fan blades and the experimental motor. Wherein, the distance from the end of the stiffened wall 23 away from the anchoring wall 21 to the anchoring wall 21 is set to 1 / 3-1 / 2 of the height of the anchoring wall 21; the included angle between the outer side surface of the anchoring wall 21 and the plane of the bottom plate 1 is 65°-80°, and the included angle between the central axis of the mounting hole 26 and the plane of the bottom plate 1 is 10°-25°.

[0035] Meanwhile, in an optional embodiment, the overhanging wall 24 is formed on the outer side of the stiffened wall 23; the overhanging wall 24 is formed on the same plane as the enclosing wall 22, and the thickness and height of the overhanging wall 24 are the same as those of the enclosing wall 22; and the length of the overhanging wall 24 is not greater than a preset value; the preset value is 1 / 4 of the shortest distance from the outer side of the stiffened wall 23 to the symmetry plane of the two stiffened walls 23; the specific formula is d≤Sn / 4; d represents the length of the overhanging wall 24, and Sn represents the shortest distance from the outer side of the stiffened wall 23 to the symmetry plane of the two stiffened walls 23. When deciding whether to set the overhanging wall 24, the calculation result according to the demand of the base 22 needs to be determined according to the enclosing wall 22.

[0036] S7, two groups of prestressed components 3 are respectively arranged in the vertical direction and the longitudinal direction of the base 2 and connected with two groups of prestressed tendons 4, wherein each group of the prestressed components 3 includes two fixing members 31, and the fixing members 31 are arranged as follows: The first group of the fixing members 31 of the prestressed assembly 3 are arranged on the top side of the stiffening wall 23 and the closed wall 22, and the other fixing members 31 are embedded in the base 2 and the bottom plate 1. The second group of the fixing members 31 of the prestressed assembly 3 are arranged on the front and back sides of the base 2, and the two fixing members 31 are connected by the second group of the prestressed tendons 4.

[0037] The fixing member 31 comprises 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, the base 2 or the bottom plate 1. The two opposite fixing anchors 312 are connected by the prestressed tendon 4.

[0038] S8, the two groups of prestressed tendons 4 are alternately tensioned in a preset tensioning sequence, so that the prestress of the two groups of prestressed tendons 4 reaches 30%, 60% and 100% of the specified tensioning stress in turn. For example, the prestressed tendons 4 are alternately tensioned to 30% of the specified tensioning stress in the sequence of longitudinal direction first and then vertical direction; then the prestressed tendons 4 are alternately tensioned to 60% of the specified tensioning stress in the same sequence; finally, the prestressed tendons 4 are alternately tensioned to 100% of the specified tensioning stress in the same sequence.

[0039] The box-type fan blade static load test bed formed by the above-mentioned construction method is as follows: Please refer to Figures 1 to 12 A box-type fan blade static load test bed comprises a bottom plate 1 and a base 2 arranged on the bottom plate 1. The base 2 comprises an anchoring wall 21, a closed wall 22 and two stiffening walls 23 arranged in a box-type structure. The anchoring wall 21, the closed wall 22 and the stiffening wall 23 are made of reinforced concrete structure, and the four walls together form the main body of the base 2. In other optional embodiments, a fiber concrete structure is used to increase the crack resistance of the base 2. The bottom plate 1 is further provided with a zipper device 6. The zipper device 6 is used to connect with the fan blade.

[0040] The anchoring wall 21 and the closed wall 22 are arranged opposite to each other in a first direction, which is the installation direction of the fan blade. The two stiffening walls 23 are arranged opposite to each other in a second direction and connect the anchoring wall 21 and the closed wall 22. That is, the stiffening walls 23 are arranged on the two sides behind the anchoring wall 21 and are located on the two opposite sides of the fan blade. At the same time, the distance from the end of the stiffening wall 23 away from the anchoring wall 21 to the anchoring wall 21 is 1 / 3-1 / 2 of the height of the anchoring wall 21.

[0041] Please refer toFigure 4 The closed wall 22 is provided with a construction door hole 25 near one side of the base plate 1; the construction door hole 25 is arranged on the central axis of the closed wall 22 in the length direction, which is the second direction; that is, the construction door hole 25 is arranged at the middle position of the two reinforced walls 23; and the distance from the top surface of the construction door hole 25 to the top surface of the closed wall 22 is not less than twice the thickness of the reinforced wall 23.

[0042] The anchoring wall 21 is provided with a mounting hole 26 for mounting the fan blade and the experimental motor. The outer side surface of the anchoring wall 21 forms an included angle of 65°-80° with the plane of the base plate 1; and the central axis of the mounting hole 26 forms an included angle of 10°-25° with the plane of the base plate 1. As shown in Figure 6 The mounting hole 26 is a hole arranged in the center of the anchoring hole group 27; the anchoring hole group 27 is a circular hole array with a plurality of uniformly distributed circular holes, the geometric center of which coincides with the geometric center of the anchoring wall 21, and the hole form is set according to the actual experimental requirements. When the fan blade is mounted, the fan blade root anchoring cage is passed through the anchoring hole group 27, and the fan blade is anchored to the base 2.

[0043] In an optional embodiment, the base 2 further comprises an overhanging wall 24; the overhanging wall 24 is connected with the reinforced wall 23, and the overhanging wall 24 is arranged on the same plane as the closed wall 22; the thickness and height of the overhanging wall 24 are the same as those of the closed wall 22; that is, the overhanging wall 24 extends outward beyond the outer surface of the reinforced wall 23 along the plane of the closed wall 22.

[0044] Please refer to Figure 5 and Figure 6 The base 2 is further provided with a bidirectional prestressed system comprising a longitudinal prestressed system and a vertical prestressed system; the vertical prestressed system is vertically arranged on the top of the reinforced wall 23 away from the fan blade and the top of the closed wall 22, and if the base 2 is provided with the overhanging wall 24, the vertical prestressed system is also arranged on the top of the reinforced wall 23, the closed wall 22 and the overhanging wall 24; the longitudinal prestressed system is parallel to the ground and longitudinally arranged on the front and rear ends of the upper end of the reinforced wall 23, in particular: The base 2 comprises two groups of prestressed components 3 and two groups of prestressed tendons 4; each group of prestressed components 3 comprises two fixing members 31; one fixing member 31 of the first group of prestressed components 3 is arranged on the top side of the intersection of the stiffened wall 23 and the enclosing wall 22, and the other fixing member 31 is arranged in the bottom plate 1; wherein, if the base 2 is provided with an overhanging wall 24, the fixing member 31 is arranged on the top of the stiffened wall 23, the enclosing wall 22 and the overhanging wall 24; the first group of prestressed tendons 4 connects the two fixing members 31 through the base 2 and the bottom plate 1; the prestressed tendon 4 is composed of 2-10 bundles of prestressed steel strands or prestressed anchor bolts. The two fixing members 31 of the second group of prestressed components 3 are arranged on the front and rear sides of the base 2 respectively, and the second group of prestressed tendons 4 connects the two fixing members 31 in turn through the anchoring wall 21, the stiffened wall 23 and the enclosing wall 22.

[0045] Please refer to Figure 8 and Figure 9 The fixing member 31 comprises 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, in the base 2 or in the bottom plate 1; the two oppositely arranged fixed anchors 312 are connected by the prestressed tendon 4. The anchoring block 311 is a reinforced concrete structure, comprising a steel plate 3111 and an anchoring steel bar 3112; the steel plate 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 plate 3111; for example, one end of the anchoring steel bar 3112 is welded on the steel plate 3111, and the rest is embedded in the structure of the base 2. As shown in Figure 5 The top of the base 2 is provided with two groups of anchoring blocks 311, the steel plate 3111 is arranged on the upper surface of the stiffened wall 23, the enclosing wall 22 and the overhanging wall 24, and the anchoring steel bar 3112 penetrates the stiffened wall 23, the enclosing wall 22 and the overhanging wall 24. At the same time, the front and rear ends of the upper end of the two-sided stiffened wall 23 are also provided with steel plates 3111, the anchoring steel bar 3112 at the front end penetrates the anchoring wall 21 and the stiffened wall 23, and the anchoring steel bar 3112 at the rear end penetrates the enclosing wall 22 and the stiffened wall 23. Among them, the number of fixed anchors 312 and prestressed tendons 4 can be set according to actual conditions.

[0046] In summary, the box type fan blade static load test bench construction method provided by the application, through the anchor wall, the closed wall and the two face stiffening wall, the base of the box type structure is surrounded, the stiffening wall and the closed wall are arranged to improve the cross section resisting moment of the base, the box type structure is formed to improve the bending and torsion resistance of the base; at the same time, the base adopts the fiber concrete structure to increase the crack resistance of the base; the construction door hole is arranged on the closed wall, and the mounting hole is arranged on the anchor wall to mount the fan blade and the experimental motor, so that the construction of the operator is more convenient. And the angle of the mounting hole is 10°-25°, the initial height of the fan blade rising upwards is higher, the fan blade is prevented from being damaged after being lowered to the ground. And the prestressed reinforcement is arranged, which not only improves the fatigue resistance and crack resistance of the base, but also reduces the number of steel bars, and is easier to construct.

[0047] The above only describes the embodiments of the application, and does not limit the patent scope 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 drawings of the application is also included in the patent protection scope of the application.

Claims

1. A method for constructing a box-type fan blade static 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; The construction is carried out in sections from the bottom surface of the base plate to the center of the cylinder of the truss and the preset base height to form a base with a box structure; and a construction doorway is formed on the base; Two sets of prestressed components are respectively provided in the vertical direction and the longitudinal direction of the base and connected with the two sets of prestressed tendons; The two groups of prestressed tendons are tensioned alternately according to a preset tensioning sequence, so that the prestress of the two groups of prestressed tendons reaches 30%, 60% and 100% of the specified tensioning stress respectively.

2. The method for constructing a box-type fan blade static load test bench according to claim 1, characterized in that: The stepwise pouring construction from the bottom surface of the base plate to the cylindrical center of the truss and the preset base height 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; Casting construction from the top section of the truss to the preset base height; The base includes a box-shaped structure surrounded by an anchor wall, a closing wall, and two stiffening walls; The base having a box-shaped structure comprises: The anchor wall, the stiffening wall and the closed wall are formed simultaneously by pouring construction, and a mounting hole is formed in the anchor wall, and a construction door opening is formed in the closed wall; The mounting holes are used to mount fan blades and an experimental motor.

3. The method for constructing a box-type fan blade static load test bench according to claim 2, characterized in that: The base having a box-shaped structure further comprises: forming an overhanging wall on the outer side of the stiffening wall; The cantilevered wall and the closed wall are formed on the same plane, and the thickness and height of the cantilevered wall are the same as those of the closed wall.

4. The method for constructing a box-type fan blade static load test bench according to claim 3, characterized in that: The length of the cantilevered wall 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 to the symmetry planes of the two stiffening walls.

5. The method for constructing a box-type fan blade static load test bench according to claim 2, characterized in that: The construction door opening is formed on the central axis in the length direction of the closed wall; The distance from the top surface of the construction door opening to the top surface of the closed wall is not less than twice the thickness of the reinforced wall.

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

7. The method for constructing a box-type fan blade static load test bench according to claim 2, characterized in that: The base having a box-shaped structure comprises: Form an angle of 65°-80° between the outer side surface of the anchor wall and the bottom plate plane; An included angle of 10°-25° is formed between the central axis of the mounting hole and the plane of the base plate.

8. The method for constructing a box-type fan blade static load test bench according to claim 2, characterized in that: The two sets of prestressed components are respectively provided in the vertical direction and the longitudinal direction of the base and connected with the two sets of prestressed tendons, comprising: Each group 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 junction of the stiffening wall and the closed wall, and the other fixing member is a pre-buried fixing member; the two fixing members are connected by the first group of prestressed tendons passing through the base and the bottom plate; The two fixing members of the second 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 second group of prestressed tendons passing through the anchor wall, the stiffening wall and the closed wall in sequence.

9. The method for constructing a box-type fan blade static load test bench according to claim 8, characterized in that: The fixing member includes an anchor block and a fixing anchor; The anchor block is arranged on the surface of the base; The fixing anchor is arranged in the anchor block, the base or the bottom plate; The two oppositely arranged fixing anchors are connected via the prestressed tendons.

10. A box-type fan blade static load test bench structure, characterized in that: It includes a bottom plate, a base, three groups of prestressed components and three groups of prestressed tendons; the base is made of fiber concrete; The base is arranged on the bottom plate, and the base includes an anchor wall and stiffening walls arranged on both sides of the anchor wall; the anchor wall is provided with mounting holes for mounting fan blades and an experimental motor; Each of the prestressed components includes two fixing members; The two fixing members of the first group of prestressed components are respectively arranged on the top side of the stiffening wall and in the bottom plate, and the first group of prestressed tendons penetrate the bottom plate and the base to connect the two fixing members; 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 second group of prestressed tendons penetrates the base to connect the two fixing members; 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 third group of prestressed tendons penetrates the base to connect the two fixing members.

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