Strain recovery characteristic test equipment for connecting member of concrete prefabricated structure
By designing a strain recovery characteristic test equipment for the connection members of concrete prefabricated structures, the problem of lack of verification tools in the prior art is solved, and effective testing and verification of the strain recovery characteristics of the connection members of concrete prefabricated structures is realized.
Patent Information
- Application Number
- CN202420954670.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-06
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-06
AI Technical Summary
There is a lack of simulation test devices for verifying the prestress calculation value of concrete prefabricated structural connection components in the prior art, which makes it difficult to achieve data simulation verification.
A test equipment for strain recovery characteristics of the connection members of the prefabricated concrete structure is designed. The pressure is applied by driving the pressure plate through the hydraulic cylinder to simulate the deformation and strain recovery characteristics of the connecting members of the prefabricated concrete structure under load, and the deformation is measured by an ultrasonic or infrared rangefinder.
Effective testing and verification of the strain recovery characteristics of the connecting components of concrete prefabricated structures is achieved, which can simulate the impact of loads at different locations on the strain recovery characteristics, and solves the problem of lack of verification tools in the prior art.
Smart Images
Figure CN222561461U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stress testing, in particular to a test device for strain recovery characteristics of a concrete prefabricated structure connection component. Background Art
[0002] Concrete prefabricated structural connection components are designed to avoid the premature appearance of cracks in reinforced concrete structures, make full use of high-strength steel bars and high-strength concrete, and try to reduce the tensile stress generated by the components by applying external force before the concrete structure or components are subjected to the use load, or even the concrete components in a compressive stress state. Prestressing stress is used to reduce or offset the tensile stress of concrete caused by the load, thereby controlling the tensile stress of the structural components within a smaller range, or even in a compressive state, to delay the appearance and development of concrete cracks, thereby improving the crack resistance and stiffness of the components. Therefore, in the prior art, prestressed concrete prefabricated structural connection components under pressure must be prestressed during the prefabrication process. After the prestressing is applied, the concrete prefabricated structural connection components will deform, but after the pressure is applied, the deformed concrete prefabricated structural connection components will be restored to their original state under the action of pressure. This is the strain recovery characteristic of the concrete prefabricated structural connection components. In the prior art, a large amount of calculations are required to obtain the size of the prestressing applied to the concrete prefabricated structural connection components. However, after searching, there is no simulation test device in the prior art for verifying the above-mentioned calculated values. Therefore, how to simulate and verify the data is a problem that needs to be solved urgently. Utility Model Content
[0003] The purpose of the utility model is to solve the shortcomings existing in the prior art and to propose a strain recovery characteristic testing device for concrete prefabricated structure connection components, thereby solving the problems existing in the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A strain recovery characteristic testing device for precast concrete structure connection components comprises an assembly plate, the upper side of the assembly plate is slidably connected to a base plate, two brackets are arranged on the upper side of the base plate, the upper side of the assembly plate is fixedly connected to two vertical plates, the upper ends of the two vertical plates jointly support and fix a top plate, the upper side of the top plate is slidably connected to a slide plate, a plurality of hydraulic cylinders are mounted on the slide plate, the telescopic end of each hydraulic cylinder is fixedly connected to a pressure plate, and a plurality of first rangefinders are mounted on the lower side of the top plate.
[0006] Furthermore, a slide rail is arranged on the upper side of the base plate, a slider is slidably connected to the slide rail, and the bracket is fixed to the slider.
[0007] Furthermore, a plurality of second rangefinders are mounted on the upper side of the substrate.
[0008] Furthermore, a plurality of avoidance grooves are provided on the top plate, and the telescopic ends of the hydraulic cylinders pass through the avoidance grooves.
[0009] Furthermore, the first rangefinder and the second rangefinder are ultrasonic rangefinders or infrared rangefinders.
[0010] The beneficial effects of the utility model are as follows: pressure is applied to the precast concrete structure connection member through a pressure plate, and the pressure simulates the load force received by the precast concrete structure connection member during operation. The precast concrete structure connection member is deformed by the force, and the strain recovery characteristics of the precast concrete structure connection member are obtained. By changing the position where the pressure is applied to the precast concrete structure connection member, the influence of loads at different positions on the strain recovery characteristics can be simulated. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a basic structural schematic diagram of the utility model;
[0012] Figure 2 yes Figure 1 The enlarged view of point W;
[0013] Figure 3 yes Figure 1 Enlarged view of point A. DETAILED DESCRIPTION
[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0015] like Figure 1-3 As shown, a strain recovery characteristic test device for a concrete prefabricated structure connection member provided by the utility model comprises an assembly plate 1, the upper side of the assembly plate 1 is slidably connected to a base plate 2, two brackets 3 are arranged on the upper side of the base plate 2, and the two brackets 3 are used to carry the concrete prefabricated structure connection member 100 to be tested, and the width of the concrete prefabricated structure connection member 100 may be different. Therefore, in order to adapt to the use of concrete prefabricated structure connection members 100 of different widths, a slide rail 31 is installed on the upper side of the base plate 2, and a slider 32 is slidably connected to the slide rail 31, and the bracket 3 is fixed to the slider 32. The distance between the two brackets 3 is changed by moving the slider 32 on the slide rail 31, so that it can be suitable for the carrying use of concrete prefabricated structure connection members 100 of different widths.
[0016] The upper side of the assembly plate 1 is fixedly connected to two vertical plates 4, a guide rod is provided between the two vertical plates 4, a guide hole is provided on one side of the base plate 2, the base plate 2 slides back and forth along the guide rod through the guide hole, and a screw rod 22 is also rotatably connected between the two vertical plates 4, a motor 23 for driving the screw rod 22 to rotate is installed on the vertical plate 4, a screw nut is installed on the base plate 2, the screw rod 22 is threaded in the screw nut, so the motor 23 drives the screw rod 22 to rotate forward or reversely, so that the base plate 2 can slide back and forth along the guide rod. In this way, the position of the base plate 2 can be changed, that is, the specific position of the concrete prefabricated structure connection component 100 is changed. A plurality of second rangefinders 21 are installed on the upper side of the base plate 2.
[0017] The upper ends of the two vertical plates 4 jointly support and fix the top plate 5, and the upper side of the top plate 5 is slidably connected to the slide plate 6. The slide plate 6 is driven in the same way as the base plate 2. In order to be concise, the specific structure of the slide plate 6 is not described here. In addition, the reciprocating direction of the slide plate 6 is exactly perpendicular to the reciprocating direction of the base plate 2. A plurality of hydraulic cylinders 7 are installed on the slide plate 6, and a plurality of avoidance grooves 52 are provided on the top plate 5. The telescopic ends of the hydraulic cylinders 7 pass through the avoidance grooves 52. The telescopic ends of each hydraulic cylinder 7 are fixedly connected to the pressure plate 71. A plurality of first rangefinders 51 are installed on the lower side of the top plate 5. The first rangefinder 51 and the second rangefinder 21 are ultrasonic rangefinders or infrared rangefinders.
[0018] During use, the prefabricated concrete structure connection member 100 is installed on the bracket 3, and then the distance from each point on the upper surface of the prefabricated concrete structure connection member 100 to the top plate 5 is obtained through the first distance meter 51, and the linear diagram of the upper surface of the prefabricated concrete structure connection member 100 is obtained. The distance from each point on the lower surface of the prefabricated concrete structure connection member 100 to the base plate 2 is obtained through the second distance meter 21, and the linear diagram of the lower surface of the prefabricated concrete structure connection member 100 is obtained. Then, the pressure plate 71 is driven down by the hydraulic cylinder 7 to apply pressure to the prefabricated concrete structure connection member 100, and the pressure simulates the load force received by the prefabricated concrete structure connection member 100 during operation. At this time, the prefabricated concrete structure connection member 100 is deformed by force, and then the distance from each point on the upper surface of the prefabricated concrete structure connection member 100 to the top plate 5 is obtained through the first distance meter 51, and the linear diagram of the upper surface of the prefabricated concrete structure connection member 100 is obtained. The distance from each point on the lower surface of the prefabricated concrete structure connection member 100 to the base plate 2 is obtained through the second distance meter 21, and the linear diagram of the lower surface of the prefabricated concrete structure connection member 100 is obtained. By comparing the linear diagrams of the upper and lower surfaces of the prefabricated concrete structure connection member 100 twice, the strain recovery characteristics of the prefabricated concrete structure connection member 100 are obtained. During the test process, adjusting the specific positions of the base plate 2 and the slide plate 6 can change the position where the pressure is applied to the prefabricated concrete structure connection member 100, so that the influence of loads at different positions on the strain recovery characteristics can be simulated.
[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A test equipment for strain recovery characteristics of prefabricated concrete structure connection components, characterized in that: The invention comprises an assembly plate (1), the upper side of the assembly plate (1) is slidably connected to a base plate (2), the upper side of the base plate (2) is provided with two brackets (3), the upper side of the assembly plate (1) is fixedly connected to two vertical plates (4), the upper ends of the two vertical plates (4) jointly support a fixed top plate (5), the upper side of the top plate (5) is slidably connected to a slide plate (6), a plurality of hydraulic cylinders (7) are mounted on the slide plate (6), the telescopic end of each hydraulic cylinder (7) is fixedly connected to a pressure plate (71), and a plurality of first rangefinders (51) are mounted on the lower side of the top plate (5).
2. A strain recovery characteristic testing device for prefabricated concrete structure connection members as claimed in claim 1, characterized in that: A slide rail (31) is mounted on the upper side of the base plate (2), a sliding block (32) is slidably connected to the slide rail (31), and the bracket (3) is fixed to the sliding block (32).
3. A strain recovery characteristic testing device for prefabricated concrete structure connection members as claimed in claim 1, characterized in that: A plurality of second distance measuring devices (21) are mounted on the upper side of the substrate (2).
4. A strain recovery characteristic testing device for prefabricated concrete structure connection members as claimed in claim 1, characterized in that: The top plate (5) is provided with a plurality of avoidance grooves (52), and the telescopic ends of the hydraulic cylinders (7) pass through the avoidance grooves (52).
5. The strain recovery characteristic testing equipment for prefabricated concrete structure connection members according to claim 3, characterized in that: The first rangefinder (51) and the second rangefinder (21) are ultrasonic rangefinders or infrared rangefinders.