A concrete specimen full strain testing device and use method

Abstract

The present invention belongs to the technical field of concrete test and provides a full strain test device for concrete specimens and a method for using the device, including a support frame, a telescopic frame vertically rotatably connected in the support frame, and a concrete specimen detachably connected in the telescopic frame; a loading assembly, the loading assembly including a loading container arranged below the support frame, the loading container being connected to a liquid circulation component, a connecting assembly arranged on the top of the loading container, and the connecting assembly being used to connect the loading container with the telescopic end of the telescopic frame; a data acquisition assembly, the data acquisition assembly including a terminal, a pressure acquisition component arranged between the loading container and the connecting assembly, and a deformation acquisition component arranged on the concrete specimen; a lifting component, the lifting component being arranged at the bottom of the loading container and used to lift the loading container. The present invention can perform both full strain tests on concrete under tension and full strain tests on concrete under compression.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete test and experiment, and in particular relates to a concrete specimen full strain test device and a use method thereof. Background Art

[0002] Since concrete has low tensile strength and small ultimate deformation, and is prone to sudden failure, especially during tensile tests, it is considered a brittle material. Therefore, experimental research on the tensile properties of concrete mainly considers the tensile strength value and the rising section of the stress-strain curve.

[0003] The reasons can be analyzed. On the one hand, the tensile strength of ordinary concrete is only 1 / 10 to 1 / 20 of its compressive strength. In structural design, the ability of concrete to withstand tension is generally not considered, so the tensile properties of concrete are not given enough attention. On the other hand, the axial tensile test for determining the full unidirectional tensile stress-deformation curve of concrete has very high requirements on the stiffness of the testing machine. The test results are greatly affected by the test conditions, making the test very difficult and the results obtained are highly discrete.

[0004] The stress-strain test of concrete under uniaxial tension is a test method that can reflect the tensile properties of concrete. At the same time, the stress-strain test of concrete under uniaxial compression is also one of the basic bases for the rational design of reinforced concrete structures and the study of their strength and deformation behavior. Therefore, the stress-strain test of concrete under axial compression / tensile stress is of great significance: (1) The stress-strain test of concrete can evaluate the strength, stiffness, ductility and other properties of concrete, and is one of the important means to evaluate the quality of concrete. These performance parameters are directly related to the bearing capacity and safety of concrete structures. Therefore, accurate stress-strain testing is crucial to ensure the safety and stability of concrete structures. (2) The stress-strain test of concrete is also of great significance for evaluating the health of concrete structures and predicting their future behavior. By monitoring the stress-strain response of concrete under different loads and conditions, potential structural problems such as cracks and deformation can be discovered in a timely manner, and corresponding measures can be taken to repair or reinforce them. This helps to extend the service life of concrete structures and reduce losses caused by structural failure. (3) When designing and optimizing concrete structures, stress-strain test data is also an indispensable reference. By testing and analyzing the stress-strain performance of concrete under different design parameters, more accurate and reliable data support can be provided for structural design, thereby improving the rationality and economy of the design. Therefore, concrete stress-strain testing is of great significance in evaluating concrete quality, assessing structural health, optimizing structural design, and guiding material research and development. In concrete engineering practice, stress-strain testing should be emphasized and strengthened to ensure the safety and stability of concrete structures.

[0005] The full strain curve of concrete under axial tension or compression can be divided into an ascending section, a descending section, and a flat part of the descending section. Due to the brittleness of concrete itself and the insufficient rigidity of the loading frame of ordinary testing machines, when the cracks inside the concrete specimen begin to expand and the bearing capacity tends to decrease, the elastic deformation energy accumulated in the loading frame of the testing machine is suddenly released, causing the specimen to be instantly damaged by the impact. Therefore, it is difficult to obtain the stress-strain curve of the concrete specimen after the peak using an ordinary pressure testing machine. At the same time, the existing concrete stress-strain testing equipment can only complete the full tensile strain test or the full compressive strain test of concrete, and it is impossible to achieve both tensile and compressive tests on the same device, resulting in the need for the testing organization to purchase multiple devices, which is inconvenient to use. Summary of the invention

[0006] The purpose of the present invention is to provide a concrete specimen full strain testing device and a method of use, so as to solve the above-mentioned problem and achieve the purpose of being able to perform both tensile full strain testing and compressive full strain testing.

[0007] To achieve the above object, the present invention provides the following solution: a concrete specimen full strain testing device, comprising:

[0008] A support frame, wherein a telescopic frame is vertically rotatably connected in the support frame, wherein a concrete specimen is detachably connected in the telescopic frame, wherein when the telescopic end of the telescopic frame is located at the bottom and moves downward to extend, tensile stress is applied to the concrete specimen, and when the telescopic end of the telescopic frame is located at the top and moves downward to retract, compressive stress is applied to the concrete specimen;

[0009] A loading assembly, the loading assembly comprising a loading container disposed below the supporting frame, the loading container being connected to a liquid circulation member, a connecting assembly being disposed on the top of the loading container, the connecting assembly being used to connect the loading container to the telescopic end of the telescopic frame;

[0010] A data acquisition component, the data acquisition component comprising a terminal, a pressure acquisition component disposed between the loading container and the connecting component, and a deformation acquisition component disposed on the concrete specimen, the terminal being electrically connected to the pressure acquisition component and the deformation acquisition component;

[0011] A lifting member is arranged at the bottom of the loading container and is used to lift the loading container when the connecting assembly is connected to the telescopic end of the telescopic frame.

[0012] Preferably, the telescopic frame includes a main U-shaped frame and a secondary U-shaped frame, the two ends of the secondary U-shaped frame are slidably connected to the two ends of the main U-shaped frame, the two opposite side walls of the main U-shaped frame are rotatably connected in the support frame through a rotating shaft, and the concrete specimen is detachably connected between the main U-shaped frame and the secondary U-shaped frame.

[0013] Preferably, both ends of the concrete specimen are detachably connected with connecting plates, and two groups of connecting plates are fixedly connected with connecting blocks on one side away from the concrete specimen, and connecting grooves are respectively opened on the inner walls of the main U-shaped frame and the auxiliary U-shaped frame, and the connecting grooves are adapted to the connecting blocks.

[0014] Preferably, the connecting assembly includes a pressure plate and a load-bearing plate arranged in sequence from top to bottom, the bottom of the pressure plate is vertically fixedly connected to one end of a plurality of pull rods, the other ends of the plurality of pull rods respectively pass through the load-bearing plate and are fixedly connected to the top of the loading container, the load-bearing plate and the secondary U-shaped frame are detachably connected via a mounting part, and the pressure collection part is arranged between the pressure plate and the load-bearing plate.

[0015] Preferably, the mounting member includes a loading plate and two groups of pull plates fixedly connected to the load-bearing plate, the two groups of pull plates are respectively provided with two groups of first through holes from top to bottom, and the auxiliary U-shaped frame is provided with a second through hole at one end away from the main U-shaped frame, and the connection between the pull plate and the auxiliary U-shaped frame is achieved by passing the loading plate through the second through hole and the two groups of first through holes.

[0016] Preferably, the bottom of the support frame is fixedly connected to an intermediate plate, the bottom of the intermediate plate is fixedly connected to a plurality of support columns, a base is fixedly connected between the bottoms of the plurality of support columns, the loading container is located below the intermediate plate, two groups of through holes are provided on the intermediate plate, and the two groups of pull plates respectively pass through the two groups of through holes.

[0017] Preferably, it also includes a liquid circulation component, which includes a liquid storage tank, and the liquid storage tank is respectively connected to one end of a liquid inlet hose and a return hose, and the other ends of the liquid inlet hose and the return hose respectively pass through the bottom of the side wall of the loading container and are connected to the interior of the loading container, the liquid inlet hose is connected to a second solenoid valve, and the return hose is connected to a first solenoid valve, and the liquid inlet hose and the return hose are also respectively connected to a liquid pump.

[0018] Preferably, the lifting member includes a plurality of hydraulic push rods vertically fixedly connected to the base, and the plurality of hydraulic push rods are connected to an external hydraulic pump station.

[0019] A method for using a concrete specimen full strain testing device, the operating steps comprising:

[0020] The full strain test method for concrete under compressive stress includes:

[0021] The prepared concrete specimen is fixedly connected in the telescopic frame;

[0022] Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the top;

[0023] The loading container is lifted upward by the lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container;

[0024] Liquid is added into the loading container through a liquid circulation part to generate compressive stress on the concrete specimen, and data during the test are collected through a pressure collection part and a deformation collection part;

[0025] The full strain test method for concrete under compressive stress includes:

[0026] The prepared concrete specimen is fixedly connected in the telescopic frame;

[0027] Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the bottom;

[0028] The loading container is lifted upward by the lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container;

[0029] Liquid is added into the loading container through the liquid circulation part to generate tensile stress on the concrete specimen, and data during the test are collected through the pressure collection part and the deformation collection part.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects: by rotating the telescopic frame 180 degrees in the supporting frame, the telescopic end of the telescopic frame can be selectively placed at the bottom or top; when the telescopic end of the telescopic frame is at the bottom, the gravity load provided by the loading container can be used to perform a full strain test on the concrete specimen under tensile stress; when the telescopic end of the telescopic frame is at the top, the gravity load provided by the loading container can be used to perform a full strain test on the concrete specimen under compressive stress; the loading container avoids the damage to the specimen caused by the accumulated force of the elastic deformation of the loading frame by means of natural force; the entire destruction process is entirely provided by the gravity of the loading container and the internal liquid, and there will be no instantaneous destruction of the specimen during the test process, so that the test can obtain a stress-strain curve after the peak value. On the whole, the present invention can perform tensile full strain tests on concrete specimens under tensile stress, and can also perform compressive full strain tests on concrete specimens under compressive stress, so that one machine can be used for multiple purposes. At the same time, no matter whether it is a compressive stress test or a tensile stress test, liquid can be injected into the loading container to load the specimen by gravity, avoiding the situation in which the elastic deformation energy of the conventional loading frame is suddenly released, causing the specimen to be instantly damaged by impact, and it is convenient to obtain the load and deformation of the entire destruction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the test equipment of the present invention performing compressive stress testing on a test piece;

[0033] Figure 2 It is a schematic diagram of the telescopic frame when the test equipment of the present invention performs a compressive stress test on a test piece;

[0034] Figure 3 A schematic diagram of the testing device of the present invention performing a tensile stress test on a specimen;

[0035] Figure 4 It is a schematic diagram of the telescopic frame when the testing device of the present invention performs a tensile stress test on a specimen;

[0036] Figure 5 A schematic diagram of a loading assembly of the present invention;

[0037] Figure 6 It is a schematic diagram of connecting a deformation sensor to a concrete specimen of the present invention;

[0038] Figure 7 It is a schematic diagram of connecting a connecting plate to a concrete specimen of the present invention;

[0039] Figure 8 This is a schematic diagram of the connection between the loading container and the liquid circulation part of the present invention;

[0040] Among them, 1. base; 2. support column; 3. middle plate; 4. support frame; 5. hydraulic push rod; 6. loading container; 7. pull plate; 8. first perforation; 9. loading plate; 10. concrete specimen; 11. rotating shaft; 12. main U-shaped frame; 13. auxiliary U-shaped frame; 14. second perforation; 15. connecting plate; 16. connecting groove; 17. connecting block; 18. load-bearing plate; 19. pressure plate; 20. pressure sensor; 21. pull rod; 22. deformation sensor; 23. bracket; 24. through hole; 25. liquid storage tank; 26. reflux hose; 27. first solenoid valve; 28. liquid inlet hose; 29. ​​second solenoid valve; 30. liquid pump; 31. through hole; 32. stabilizing block. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Reference Figure 1-Figure 8 The present invention provides a concrete specimen full strain testing device, comprising:

[0044] A support frame 4, a telescopic frame is vertically rotatably connected inside the support frame 4, a concrete specimen 10 is detachably connected inside the telescopic frame, when the telescopic end of the telescopic frame is located at the bottom and moves downward to extend, tensile stress is applied to the concrete specimen 10, and when the telescopic end of the telescopic frame is located at the top and moves downward to retract, compressive stress is applied to the concrete specimen 10;

[0045] A loading assembly, the loading assembly comprises a loading container 6 disposed below the supporting frame 4, the loading container 6 is connected to a liquid circulation member, a connecting assembly is disposed on the top of the loading container 6, and the connecting assembly is used to connect the loading container 6 to the telescopic end of the telescopic frame;

[0046] A data acquisition component, the data acquisition component includes a terminal, a pressure acquisition component arranged between the loading container 6 and the connecting component, and a deformation acquisition component arranged on the concrete specimen 10, the terminal being electrically connected to the pressure acquisition component and the deformation acquisition component;

[0047] A lifting member is arranged at the bottom of the loading container 6 and is used to lift the loading container 6 when the connecting assembly is connected to the telescopic end of the telescopic frame.

[0048] The main function of the telescopic frame is to generate tensile stress or compressive stress on the concrete specimen 10 connected therein by its own extension or contraction; by rotating the telescopic frame 180 degrees in the support frame 4, the telescopic end of the telescopic frame can be selectively placed at the bottom or top. When the telescopic end of the telescopic frame is at the bottom, the gravity load provided by the loading container 6 can be used to perform a full strain test on the concrete specimen 10 under tensile stress; when the telescopic end of the telescopic frame is at the top, the gravity load provided by the loading container 6 can be used to perform a full strain test on the concrete specimen 10 under compressive stress; the main function of the connecting assembly is to connect the loading container 6 with the telescopic end of the telescopic frame; the main function of the liquid circulation component is to add or release liquid into the loading container 6 to increase or decrease the load. The stress generated by the loading container 6 on the concrete specimen 10 is reduced. The loading container 6 filled with liquid loads the specimen by its own gravity. By means of natural force, the damage to the specimen caused by the force accumulated by the elastic deformation of the loading frame is avoided. The entire destruction process is provided by the gravity of the loading container 6 and the internal liquid. There will be no instantaneous destruction of the specimen during the test process, so that the test can obtain the stress-strain curve after the peak value; the main function of the pressure collection piece is to collect the stress value applied to the concrete specimen 10 during the test; the main function of the deformation collection piece is to collect the stretching or compression of the concrete specimen 10 during the test; the main function of the lifting piece is to lift the loading container 6 upward to facilitate the connection of the connecting component with the telescopic end of the telescopic frame. On the whole, the present invention can perform tensile full strain tests on concrete specimens under tensile stress, and can also perform compressive full strain tests on concrete specimens under compressive stress, so that one machine can be used for multiple purposes. At the same time, no matter whether it is a compressive stress test or a tensile stress test, liquid can be injected into the loading container to load the specimen by gravity, avoiding the situation in which the elastic deformation energy of the conventional loading frame is suddenly released, causing the specimen to be instantly damaged by impact, and it is convenient to obtain the load and deformation of the entire destruction process.

[0049] A further optimized solution is that the telescopic frame includes a main U-shaped frame 12 and a secondary U-shaped frame 13. The two ends of the secondary U-shaped frame 13 are slidably connected to the two ends of the main U-shaped frame 12. The two opposite side walls of the main U-shaped frame 12 are rotatably connected in the support frame 4 through the rotating shaft 11 respectively. The concrete specimen 10 is detachably connected between the main U-shaped frame 12 and the secondary U-shaped frame 13.

[0050] like Figure 2 As shown, when the concrete specimen is subjected to a compressive stress test, the auxiliary U-shaped frame 13 is rotated upward, and the gravity of the loading container 6 presses down the auxiliary U-shaped frame 13, thereby shortening the distance between the main U-shaped frame 12 and the auxiliary U-shaped frame 13, so that the concrete specimen 10 is compressed between the main U-shaped frame 12 and the auxiliary U-shaped frame 13, thereby achieving a compressive test on the concrete specimen 10.

[0051] like Figure 4As shown, when a tensile stress test is performed on the concrete specimen, the auxiliary U-shaped frame 13 is rotated downward, and the gravity of the loading container 6 presses down the auxiliary U-shaped frame 13, so that the distance between the main U-shaped frame 12 and the auxiliary U-shaped frame 13 increases, so that the concrete specimen 10 is subjected to tension between the main U-shaped frame 12 and the auxiliary U-shaped frame 13, thereby realizing a tensile test on the concrete specimen 10.

[0052] According to a further optimization scheme, both ends of the concrete specimen 10 are detachably connected with connecting plates 15, and two sets of connecting plates 15 are fixedly connected with connecting blocks 17 on one side away from the concrete specimen 10, and connecting grooves 16 are respectively provided on the inner walls of the main U-shaped frame 12 and the auxiliary U-shaped frame 13, and the connecting grooves 16 are adapted to the connecting blocks 17.

[0053] like Figure 2 and Figure 7 As shown, four groups of through holes 24 are formed on the connecting plate 15, and four groups of blind holes are formed at the ends of the concrete specimen 10. Screws or expansion nails are passed through the through holes 24 and connected in the blind holes to achieve a fixed connection between the concrete specimen 10 and the connecting plate 15. To facilitate the above connection work, two groups of connecting blocks 17 are provided on the top of the connecting plate 15, and the through holes 24 are located between the two connecting blocks 17.

[0054] The connection block 17 and the connection groove 16 are both T-shaped structures, and both ends of the connection groove 16 are open. After the connection plate 15 is connected to the concrete specimen 10, the two connection blocks 17 on the two connection plates 15 are slid from the side into the connection groove 16 to achieve the connection between the concrete specimen 10 and the main U-shaped frame 12 and the auxiliary U-shaped frame 13.

[0055] A further optimized solution is that the connecting assembly includes a pressure plate 19 and a load-bearing plate 18 arranged in sequence from top to bottom, the bottom of the pressure plate 19 is vertically fixedly connected to one end of a plurality of pull rods 21, the other ends of the plurality of pull rods 21 respectively penetrate the load-bearing plate 18 and are fixedly connected to the top of the loading container 6, the load-bearing plate 18 and the secondary U-shaped frame 13 are detachably connected via a mounting part, and a pressure collection part is arranged between the pressure plate 19 and the load-bearing plate 18.

[0056] A further optimized solution is that the mounting part includes a loading plate 9 and two groups of pull plates 7 fixedly connected to the load-bearing plate 18, two groups of first through-holes 8 are respectively opened on the two groups of pull plates 7 from top to bottom, and a second through-hole 14 is opened at one end of the auxiliary U-shaped frame 13 away from the main U-shaped frame 12, and the connection between the pull plate 7 and the auxiliary U-shaped frame 13 is achieved by passing the loading plate 9 through the second through-hole 14 and the two groups of first through-holes 8.

[0057] like Figure 1 and Figure 5As shown, when the concrete specimen 10 is subjected to a compressive stress full strain test, the loading container 6 is lifted upward by the lifting member, so that the two pull plates 7 are lifted together with the loading container 6. When the first through-holes 8 located above the two pull plates 7 are aligned with the second through-holes 14, the loading plate 9 is sequentially passed through the two first through-holes 8 and the second through-holes 14 to achieve the connection between the pull plates 7 and the auxiliary U-shaped frame 13. When the lifting member descends and separates from the loading container 6, the gravity of the loading container 6, i.e., the liquid inside, is loaded onto the pressing plate 19 through the pull rod 21, and the pressing plate 19 is loaded onto the bearing plate 18 through the pressure collection member, and the bearing plate 18 loads the load onto the auxiliary U-shaped frame 13 through the pull plates 7 connected thereto, thereby achieving the effect of pressing the concrete specimen 10 downward.

[0058] Similarly, if Figure 3 and Figure 5 As shown, when the concrete specimen 10 is subjected to a tensile stress full strain test, the loading container 6 is lifted upward by the lifting member, so that the two pulling plates 7 are raised together with the loading container 6. When the first through-holes 8 and the second through-holes 14 located below the two pulling plates 7 are aligned, the loading plate 9 is passed through the two first through-holes 8 and the second through-holes 14 in sequence, so as to realize the connection between the pulling plates 7 and the auxiliary U-shaped frame 13, thereby achieving the effect of pulling down the concrete specimen 10.

[0059] A further optimized solution is that the bottom of the support frame 4 is fixedly connected to an intermediate plate 3, the bottom of the intermediate plate 3 is fixedly connected to a plurality of support columns 2, a base 1 is fixedly connected between the bottoms of the plurality of support columns 2, the loading container 6 is located below the intermediate plate 3, two groups of through holes 31 are opened on the intermediate plate 3, and two groups of pull plates 7 pass through the two groups of through holes 31 respectively.

[0060] A further optimization scheme also includes a liquid circulation component, which includes a liquid storage tank 25, and the liquid storage tank 25 is respectively connected to one end of a liquid inlet hose 28 and a return hose 26, and the other ends of the liquid inlet hose 28 and the return hose 26 respectively pass through the bottom of the side wall of the loading container 6 and are connected to the interior of the loading container 6, the liquid inlet hose 28 is connected to a second solenoid valve 29, and the return hose 26 is connected to a first solenoid valve 27, and the liquid inlet hose 28 and the return hose 26 are also respectively connected to a liquid pump 30.

[0061] like Figure 8 As shown, the liquid inlet hose 28 and the return hose 26 are set as hoses to avoid interference with the movement of the loading container 6. The liquid inlet hose 28 is set at the bottom of the loading container 6 to reduce the disturbance of the liquid in the loading container 6 caused by the inflowing liquid.

[0062] In this embodiment, water is stored in the liquid storage tank 25. During the test, the second solenoid valve 29 is opened and the liquid pump 30 on the liquid inlet hose 28 is started, so that the water in the liquid storage tank 25 can be poured into the loading container 6, thereby slowly increasing the load loaded on the concrete specimen 10. In the unloading stage, the water in the loading container 6 is returned to the liquid storage tank 25 by opening the first solenoid valve 27 and starting the liquid pump 30 on the return hose 26, so that the load on the concrete specimen 10 is slowly unloaded. Since the concrete specimen 10 is loaded by the loading container 6 and the gravity of the water inside the loading container 6, the problem of instantaneous impact damage of the specimen due to the sudden release of the elastic deformation energy of the loading frame in the conventional concrete specimen testing device is completely avoided, and the load quantity parameter and deformation quantity parameter of the entire damage process can be obtained.

[0063] In a further optimized solution, the pressure collection component includes a pressure sensor 20 disposed between the pressure plate 19 and the bearing plate 18. The deformation collection component includes two groups of deformation sensors 22, both ends of which are fixedly connected to the concrete specimen 10 through brackets 23. When the concrete specimen 10 undergoes longitudinal deformation, the deformation amount is transmitted to the deformation sensor 22 through the two groups of brackets 23, and the deformation amount can be detected by the deformation sensor 22. The terminal analyzes and records the data collected by the pressure sensor 20 and the deformation sensor 22 to finally obtain the test results.

[0064] According to a further optimized solution, the lifting member includes a plurality of hydraulic jacks 5 vertically fixedly connected to the base 1, and the plurality of hydraulic jacks 5 are connected to an external hydraulic pump station.

[0065] Further optimization scheme, such as Figure 2 As shown, in order to prevent the main U-shaped frame 12 from shaking during the compressive stress full strain test, a stabilizing block 32 is abutted between the main U-shaped frame 12 and the middle plate 3 .

[0066] Further optimization scheme, such as Figure 4 As shown, in order to prevent the main U-shaped frame 12 from shaking during the tensile stress full strain test, a stabilizing block 32 is abutted between the main U-shaped frame 12 and the top of the supporting frame 4 .

[0067] A method for using a concrete specimen full strain testing device, the operating steps comprising:

[0068] The full strain test method for concrete under compressive stress includes:

[0069] The prepared concrete specimen 10 is fixedly connected in the telescopic frame;

[0070] The two ends of the prepared concrete specimen 10 are fixedly connected to the connecting plates 15 by bolts or expansion nails, and then the connecting blocks 17 on the two connecting plates 15 are respectively inserted into the connecting grooves 16 on the main U-shaped frame 12 and the auxiliary U-shaped frame 13 to complete the connection between the concrete specimen 10 and the main U-shaped frame 12 and the auxiliary U-shaped frame 13.

[0071] Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the top;

[0072] The main U-shaped frame 12 is rotated so that the auxiliary U-shaped frame 13 is located at the top and the stabilizing block 32 abuts against the main U-shaped frame 12 and the middle plate 3 .

[0073] The loading container 6 is lifted upward by the lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container 6;

[0074] The external hydraulic pump station is controlled to extend the hydraulic push rods 5, lift the loading container 6, and raise the pull plate 7. When the first through hole 8 above the pull plate 7 is aligned with the second through hole 14, the loading plate 9 is inserted into the first through hole 8 and the second through hole 14 in sequence, completing the connection between the auxiliary U-shaped frame 13 and the loading container 6.

[0075] Add liquid into the loading container 6 through the liquid circulation part to generate compressive stress on the concrete specimen 10, and collect data during the test through the pressure collection part and the deformation collection part;

[0076] The hydraulic jacks 5 are shortened by an external hydraulic pump station to separate the hydraulic jacks 5 from the loading container 6. The second solenoid valve 29 is opened and the liquid pump 30 on the liquid inlet hose 28 is started to pour the water in the liquid storage tank 25 into the loading container 6, thereby slowly increasing the pressure load on the concrete specimen 10. During the loading process, the data detected by the pressure sensor 20 and the deformation sensor 22 are recorded and analyzed by the mid-end machine.

[0077] The full strain test method for concrete under compressive stress includes:

[0078] The prepared concrete specimen 10 is fixedly connected in the telescopic frame;

[0079] The connection between the concrete specimen 10 and the main U-shaped frame 12 and the auxiliary U-shaped frame 13 is completed according to the process of the full strain test method under the action of concrete compressive stress.

[0080] Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the bottom;

[0081] The main U-shaped frame 12 is rotated so that the auxiliary U-shaped frame 13 is located at the bottom and abuts against the stabilizing block 32 between the main U-shaped frame 12 and the top of the supporting frame 4 .

[0082] The loading container 6 is lifted upward by the lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container 6;

[0083] The external hydraulic pump station is controlled to extend the hydraulic push rods 5, lift the loading container 6, and raise the pull plate 7. When the first through hole 8 below the pull plate 7 is aligned with the second through hole 14, the loading plate 9 is inserted into the first through hole 8 and the second through hole 14 in sequence, completing the connection between the auxiliary U-shaped frame 13 and the loading container 6.

[0084] Liquid is added into the loading container 6 through the liquid circulation part to generate tensile stress on the concrete specimen 10, and data during the test are collected through the pressure collection part and the deformation collection part.

[0085] The hydraulic jacks 5 are shortened by an external hydraulic pump station. The second solenoid valve 29 is opened and the liquid pump 30 on the liquid inlet hose 28 is started to pour the water in the liquid storage tank 25 into the loading container 6, thereby slowly increasing the tensile load loaded on the concrete specimen 10. During the loading process, the data detected by the pressure sensor 20 and the deformation sensor 22 are recorded and analyzed by the mid-end machine.

[0086] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0087] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A concrete specimen full strain testing device, characterized in that: include: A support frame (4), wherein a telescopic frame is vertically rotatably connected to the support frame (4), wherein a concrete specimen (10) is detachably connected to the telescopic frame, wherein when the telescopic end of the telescopic frame is located at the bottom and moves downward to extend, tensile stress is applied to the concrete specimen (10), and when the telescopic end of the telescopic frame is located at the top and moves downward to retract, compressive stress is applied to the concrete specimen (10); A loading assembly, the loading assembly comprising a loading container (6) arranged below the supporting frame (4), the loading container (6) being connected to a liquid circulation member, a connecting assembly being arranged on the top of the loading container (6), the connecting assembly being used to connect the loading container (6) to the telescopic end of the telescopic frame; a data acquisition component, the data acquisition component comprising a terminal, a pressure acquisition component arranged between the loading container (6) and the connecting component, and a deformation acquisition component arranged on the concrete specimen (10), the terminal being electrically connected to the pressure acquisition component and the deformation acquisition component; a lifting member, the lifting member being arranged at the bottom of the loading container (6) and being used for lifting the loading container (6) when the connecting assembly is connected to the telescopic end of the telescopic frame; The telescopic frame comprises a main U-shaped frame (12) and a secondary U-shaped frame (13); two ends of the secondary U-shaped frame (13) are slidably connected to two ends of the main U-shaped frame (12); two opposite side walls of the main U-shaped frame (12) are rotatably connected in the support frame (4) via a rotating shaft (11); and the concrete specimen (10) is detachably connected between the main U-shaped frame (12) and the secondary U-shaped frame (13); The connection assembly comprises a pressure plate (19) and a bearing plate (18) arranged in sequence from top to bottom, the bottom of the pressure plate (19) is vertically fixedly connected to one end of a plurality of tie rods (21), the other ends of the plurality of tie rods (21) respectively pass through the bearing plate (18) and are fixedly connected to the top of the loading container (6), the bearing plate (18) and the secondary U-shaped frame (13) are detachably connected via a mounting member, and the pressure collection member is arranged between the pressure plate (19) and the bearing plate (18); The mounting member comprises a loading plate (9) and two groups of pulling plates (7) fixedly connected to the load-bearing plate (18); two groups of first through holes (8) are respectively provided on the two groups of pulling plates (7) from top to bottom; a second through hole (14) is provided at one end of the auxiliary U-shaped frame (13) away from the main U-shaped frame (12); and the connection between the pulling plate (7) and the auxiliary U-shaped frame (13) is achieved by passing the loading plate (9) through the second through hole (14) and the two groups of first through holes (8).

2. A concrete specimen full strain testing device according to claim 1, characterized in that: The two ends of the concrete specimen (10) are detachably connected to connecting plates (15), and the two sets of connecting plates (15) are fixedly connected to connecting blocks (17) on the sides away from the concrete specimen (10). The inner walls of the main U-shaped frame (12) and the auxiliary U-shaped frame (13) are respectively provided with connecting grooves (16), and the connecting grooves (16) are adapted to the connecting blocks (17).

3. A concrete specimen full strain testing device according to claim 1, characterized in that: The bottom of the support frame (4) is fixedly connected to an intermediate plate (3), the bottom of the intermediate plate (3) is fixedly connected to a plurality of support columns (2), the bottoms of the plurality of support columns (2) are fixedly connected to a base (1), the loading container (6) is located below the intermediate plate (3), two groups of through holes (31) are provided on the intermediate plate (3), and the two groups of pull plates (7) respectively penetrate the two groups of through holes (31).

4. A concrete specimen full strain testing device according to claim 1, characterized in that: The invention also comprises a liquid circulation part, wherein the liquid circulation part comprises a liquid storage tank (25), and the liquid storage tank (25) is respectively connected to one end of a liquid inlet hose (28) and a return hose (26), and the other ends of the liquid inlet hose (28) and the return hose (26) respectively penetrate the bottom of the side wall of the loading container (6) and are connected to the interior of the loading container (6), the liquid inlet hose (28) is connected to a second solenoid valve (29), and the return hose (26) is connected to a first solenoid valve (27), and the liquid inlet hose (28) and the return hose (26) are also respectively connected to a liquid pump (30).

5. A concrete specimen full strain testing device according to claim 3, characterized in that: The lifting member comprises a plurality of hydraulic push rods (5) vertically fixedly connected to the base (1), and the plurality of hydraulic push rods (5) are connected to an external hydraulic pump station.

6. A method for using a concrete specimen full strain test device, based on the concrete specimen full strain test device according to claim 1, characterized in that: The steps include: The full strain test method for concrete under compressive stress includes: The prepared concrete test piece (10) is fixedly connected in the telescopic frame; Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the top; The loading container (6) is lifted upward by means of a lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container (6); Adding liquid into the loading container (6) through a liquid circulation component to generate compressive stress on the concrete test piece (10), and collecting data during the test through a pressure collection component and a deformation collection component; The full strain test method for concrete under compressive stress includes: The prepared concrete test piece (10) is fixedly connected in the telescopic frame; Rotate the telescopic frame so that the telescopic end of the telescopic frame is located at the bottom; The loading container (6) is lifted upward by means of a lifting member, and the connecting assembly and the telescopic end of the telescopic frame are fixedly connected, and then the lifting member is separated from the bottom of the loading container (6); Liquid is added into the loading container (6) through a liquid circulation component to generate tensile stress on the concrete test piece (10), and data during the test are collected through a pressure collection component and a deformation collection component.

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