Axial tension and compression test device for fully-graded concrete

Abstract

The invention discloses a full-graded concrete axial tension and compression test device, and belongs to the field of concrete axial tension test, the full-graded concrete axial tension and compression test device comprises a horizontal support, the horizontal support comprises a rectangular shell which is horizontally arranged, a rectangular groove is formed in the rectangular shell, and two movable discs are arranged in the rectangular groove; the two sides of the movable discs are connected with the rectangular shell through sliding structures, one sides of the two movable discs are connected with the locking and fixing assembly through horizontal-lying type shaft pulling structures, the horizontal-lying type shaft pulling structures are used for providing axial pulling force and axial pressure, and a fixing block is arranged on the locking and fixing assembly. The fixing block is connected with one end of the full-graded concrete test piece through a binding material. According to the axial tension and compression test device, the influence of gravity on axial tension and compression is weakened through the axial tension support and the axial tension clamp which are designed in a horizontal mode, meanwhile, the locking and fixing assembly does not limit the size of the fully-graded concrete cylindrical test piece, axial tension and compression tests of fully-graded concrete test pieces of different sizes can be met, and the application range is wider.

Description

Technical Field

[0001] The invention relates to the technical field of concrete axial tension test, in particular to a full-graded concrete axial tension and compression test device. Background Art

[0002] The western part of my country is rich in hydropower resources, and high dams and reservoirs account for more than 80% of the total technically exploitable resources. In addition, strong earthquakes occur frequently, and the construction of high dams and reservoirs must face severe challenges of seismic safety. Especially under the action of earthquakes, the fully graded concrete of the dam will be subjected to reciprocating tension and compression. Therefore, the study of the damage mechanism of fully graded concrete under tension-compression cyclic load is of great significance to the seismic safety assessment of high dams and reservoirs. In order to deeply study the stress-strain curve of the full process of tension-compression conversion of the fully graded concrete of the dam and explore its damage evolution law, it is particularly important to carry out experimental research on the full process curve of tension-compression conversion stress-strain and damage evolution law of the fully graded concrete of the dam under different compressive stress levels, further improve the tension-compression cyclic loading test technology of the fully graded concrete, obtain the full process curve of tension-compression conversion stress-strain of the fully graded concrete of the dam under different compressive stress levels, and then study its damage evolution mechanism, so as to provide strong support for the seismic safety assessment and seismic design of high dams and reservoirs.

[0003] In the existing axial tension and compression tests on fully-graded concrete for dams, a universal testing machine is used in conjunction with a fixture to fix the two ends of the fully-graded concrete specimen, and the axial tension and compression test is completed by applying axial tension or pressure to the fully-graded concrete specimen. However, the existing universal testing machine adopts a vertical test method, with an overall vertical setting, and performs axial tension and compression tests on the upper and lower ends of the specimen fixed by a fixture. The axial force of the specimen is affected by gravity during the test. Experimental conditions such as loading speed and gravity will work together to affect the experimental results, and gravity will affect the physical state and deformation behavior of the material. At the same time, in the existing axial tension test of fully-graded concrete, due to the influence of the structure of the device itself, the same size (or diameter) of the specimen is usually tested in the same test, and axial tension tests cannot be performed on fully-graded concrete specimens of different sizes, which has a narrow scope of application and lower applicability. Summary of the invention

[0004] The purpose of the present invention is to provide a fully-graded concrete axial tension and compression test device, which reduces the influence of gravity on axial tension and compression through a horizontally designed axial tension bracket and an axial tension clamp, and can fix fully-graded concrete specimens of different sizes through a locking and fixing component, thereby performing axial tension and compression tests, and has a wider range of applications.

[0005] To achieve the above-mentioned purpose, the present invention provides a fully-graded concrete axial tension and compression test device, including a horizontally lying bracket, the horizontally lying bracket including a flatly arranged rectangular shell, a rectangular groove is arranged in the rectangular shell, two movable discs are arranged in the rectangular groove, both sides of the movable discs are connected to the rectangular shell through a sliding structure, one side of the two movable discs is respectively connected to a locking and fixing assembly through a horizontally lying axial pulling structure, the horizontally lying axial pulling structure is used to provide axial pulling force, a fixing block is arranged on the locking and fixing assembly, and the fixing block is connected to one end of the fully-graded concrete specimen through an adhesive material.

[0006] Preferably, the sliding structure includes a slider, a sliding groove is provided on the side of the rectangular shell, the slider is inserted into the sliding groove and is slidably connected to the sliding groove, plane blocks are provided on both sides of the slider, a plane is provided on the plane block, and the plane of the plane block is slidably connected to the side of the rectangular shell.

[0007] Preferably, the top end of the movable disc is connected to the telescopic rod of the lifting and telescopic cylinder, and the lifting and telescopic cylinder is arranged at one end of the horizontal lying bracket.

[0008] Preferably, the horizontally lying axial pulling structure includes an axial pulling telescopic cylinder arranged parallel to the bottom surface of the horizontally lying bracket, the telescopic rod of the axial pulling telescopic cylinder is connected to one end of the force sensor through a ball joint, and the other end of the force sensor is connected to the locking and fixing assembly.

[0009] Preferably, the locking and fixing assembly includes a circular frame with a circular notch, the other end of the force sensor is connected to the top center of the circular frame, and the circular frame is symmetrically provided with a pressing and fixing structure.

[0010] Preferably, the clamping and fixing structure includes a clamping and telescopic cylinder 1 and a clamping and telescopic cylinder 2, which are symmetrically arranged on the side circular surface of the circular frame, and arc-shaped clamping piece 1 and arc-shaped clamping piece 2 are arranged in the circular groove. The clamping and telescopic cylinder 1 passes through the side circular surface of the circular frame and is connected to the arc-shaped clamping piece 1, and the clamping and telescopic cylinder 2 passes through the side circular surface of the circular frame and is connected to the arc-shaped clamping piece 2. Sliding cylinders are arranged at both ends of the arc-shaped clamping piece 1, and sliding holes are arranged at both ends of the arc-shaped clamping piece 2. The sliding cylinders are inserted in the cylindrical holes and are slidably connected to the cylindrical holes, and a fixing block is arranged between the arc-shaped clamping piece 1 and the arc-shaped clamping piece 2.

[0011] Preferably, the first and second clamping and telescopic cylinders are both arranged on a mounting plate, a bolt is arranged on the mounting plate, one end of the bolt passes through the side circular surface of the circular frame and is locked and connected to the locking plate by a nut.

[0012] Preferably, a pressure pad is provided on the inner side of the arc-shaped surface of the arc-shaped clamping member 1 and the arc-shaped clamping member 2.

[0013] Preferably, the bonding material is resin glue, and the bottom end of the fixing block is bonded to one end of the full-graded concrete specimen by the resin glue.

[0014] Therefore, the present invention adopts the above-mentioned fully graded concrete axial tension and compression test device, which has the following

[0015] Beneficial effects:

[0016] (1) The present invention uses a locking and fixing assembly, and utilizes the telescopic rods of the first and second telescopic cylinders on the circular frame to respectively drive the first and second arc clamping members to move. The first and second arc clamping members cooperate with each other to clamp fixed blocks of different sizes at the center of the circular frame. Fixed blocks of different sizes are fixedly connected to fully graded concrete specimens of different sizes, and can be applied to a variety of fully graded concrete specimens, which is more convenient.

[0017] (2) The present invention adopts a horizontally lying bracket with a horizontally symmetrically arranged moving disc, a horizontally lying axial tension structure and a locking and fixing assembly, so that the full-graded concrete specimen is subjected to an axial tension test by a transverse axial tension and compression method. Compared with the original universal testing machine that adopts a vertical axial tension and compression method, the influence of gravity on the axial tension test is reduced;

[0018] (3) The present invention evenly applies high-strength resin glue to the end of the fully graded concrete specimen, and then bonds the fully graded concrete specimen to a fixed block, so that the fully graded concrete specimen is subjected to more uniform force during the axial tension process, thereby improving the accuracy of the axial tension test;

[0019] (4) The present invention can provide both axial tension and axial pressure through the axial tension telescopic cylinder of the horizontal axial tension structure, so it can realize the tension-compression test of fully-graded concrete and simulate the tension-compression cyclic force that fully-graded concrete is subjected to under the action of earthquake. This is of great significance for studying the performance of fully-graded concrete under the action of earthquake loads.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a device according to an embodiment of the present invention;

[0022] Figure 2 A top view of a device according to an embodiment of the present invention;

[0023] Figure 3 A bottom view of a moving disc according to an embodiment of the present invention;

[0024] Figure 4 It is a bottom view of the locking and fixing assembly according to an embodiment of the present invention.

[0025] Reference numerals

[0026] 1. Horizontal lying bracket; 101. Rectangular shell; 102. Rectangular groove; 2. Moving disc; 201. Sliding block; 202. Plane block; 203. Plane; 204. Lifting and telescopic cylinder; 3. Horizontal lying axial pulling structure; 301. Axial pulling and telescopic cylinder; 302. Force sensor; 303. Ball joint; 4. Locking and fixing assembly; 401. Circular frame; 402. Compressing and telescopic cylinder 1; 403. Compressing and telescopic cylinder 2; 404. Arc clamping piece 1; 405. Arc clamping piece 2; 406. Sliding cylinder; 407. Mounting plate; 408. Locking plate; 409. Bolt; 5. Fixing block; 6. Resin glue; 7. Full-graded concrete specimen. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0028] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0029] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 , Figure 2 As shown, a fully graded concrete axial tension and compression test device according to the present invention comprises a horizontally lying bracket 1, wherein the horizontally lying bracket 1 comprises a rectangular shell 101 arranged horizontally, wherein a rectangular groove 102 is arranged in the rectangular shell 101, wherein two movable discs 2 are arranged in the rectangular groove 102, and both sides of the movable disc 2 are connected to the rectangular shell 101 through a sliding structure, such as Figure 3 As shown, the moving disc 2 is arranged in the rectangular groove 102 and connected to the side of the long side of the rectangular housing 101 through a sliding structure. The sliding structure includes a slider 201, and a sliding groove is arranged on the side of the rectangular housing 101. The slider 201 is inserted into the sliding groove and is slidably connected to the sliding groove. Plane blocks 202 are arranged on both sides of the slider 201, and a plane 203 is arranged on the plane block 202. The plane 203 of the plane block 202 is slidably connected to the side of the rectangular housing 101. The top of the moving disc 2 is connected to the telescopic rod of the lifting and telescopic cylinder 204, and the lifting and telescopic cylinder 204 is arranged at one end of the horizontal lying bracket 1.

[0033] The telescopic rod of the lifting and telescopic cylinder 204 drives the moving disk 2 to move, and the distance between the two moving disks 2 can be adjusted. When the moving disk 2 moves, the slider 201 slides in the sliding groove, which improves the stability of the movement of the moving disk 2. When the moving disk 2 moves, the plane 203 of the plane block 202 slides on the side of the rectangular shell 101, instead of the arc surface of the moving disk 2 contacting the rectangular shell 101, which can further improve the stability of the movement of the moving disk 2.

[0034] A horizontally lying axial pulling structure 3 is respectively arranged on one side opposite to the two movable discs 2. The horizontally lying axial pulling structure 3 is connected to the locking and fixing assembly 4. The horizontally lying axial pulling structure 3 is used to provide axial tension and axial pressure. A fixing block 5 is arranged on the locking and fixing assembly 4. The horizontally lying axial pulling structure 3 includes an axial pulling telescopic cylinder 301 arranged parallel to the bottom surface of the horizontally lying bracket 1. The telescopic rod of the axial pulling telescopic cylinder 301 is connected to one end of the force sensor 302 through a ball joint 303. The other end of the force sensor 302 is connected to the locking and fixing assembly 4. The ball joint 303 can make the axial tension or pressure more uniform and improve the stability of the test. Figure 4As shown, the locking and fixing assembly 4 includes a circular frame 401 with a circular notch, the other end of the force sensor 302 is connected to the top center of the circular frame 401, and a clamping and fixing structure is symmetrically arranged on the circular frame 401. The clamping and fixing structure includes a clamping and telescopic cylinder 1 402 and a clamping and telescopic cylinder 2 403, which are symmetrically arranged on the side circular surface of the circular frame 401. An arc-shaped clamping piece 1 404 and an arc-shaped clamping piece 2 405 are arranged in the circular notch, the clamping and telescopic cylinder 1 402 penetrates the side circular surface of the circular frame 401 and is connected to the highest point of the arc surface of the arc-shaped clamping piece 1 404, and the clamping and telescopic cylinder 2 403 penetrates the side circular surface of the circular frame 401 and is connected to the highest point of the arc surface of the arc-shaped clamping piece 2 405. The two ends of the arc-shaped clamping member 1 404 are provided with sliding cylinders 406, and the two ends of the arc-shaped clamping member 2 405 are provided with sliding holes. The sliding cylinders 406 are inserted into the cylindrical holes and are slidably connected with the cylindrical holes. The fixing block 5 is arranged between the arc-shaped clamping member 1 404 and the arc-shaped clamping member 2 405. The compression and telescopic cylinder 1 402 and the compression and telescopic cylinder 2 403 are both arranged on the mounting plate 407, and the mounting plate 407 is provided with bolts 409. One end of the bolt 409 penetrates the side circular surface of the circular frame 401 and is locked and connected with the locking plate 408 by a nut. Through the mounting plate 407 and the locking plate 408 in conjunction with the bolts 409 and the nuts, the compression and telescopic cylinder 1 402 and the compression and telescopic cylinder 2 403 can be fixedly installed on the circular frame 401.

[0035] The telescopic rod of the axial pulling telescopic cylinder 301 drives the power sensor 302 to move, and the movement of the force sensor 302 drives the circular frame 401 to move, and the circular frame 401 drives the fixed block 5 to move, and the fixed block 5 is connected to the full-graded concrete specimen 7, thereby providing axial tension and axial pressure to the full-graded concrete specimen 7. The telescopic rods of the compression telescopic cylinder 1 402 and the compression telescopic cylinder 2 403 drive the arc clamping piece 1 404 and the arc clamping piece 2 405 to move respectively, and the arc clamping piece 1 404 and the arc clamping piece 2 405 cooperate with each other to clamp the fixed block 5 in the center of the circular frame 401. The material of the fixed block 5 is steel. The inner side of the arc surface of the arc clamping piece 1 404 and the arc clamping piece 2 405 is provided with a compression pad, which is a rubber pad with particles on the inner side, which can make the arc clamping piece 1 404 and the arc clamping piece 2 405 clamp the fixed block 5 more stable. The force sensor 302 can monitor the axial tension and axial pressure during the axial tension test.

[0036] The fixing block 5 is connected to one end of the fully graded concrete specimen 7 through a bonding material. The bonding material is a high-strength resin glue 6, and the bottom end of the fixing block 5 is bonded to one end of the fully graded concrete specimen 7 through the high-strength resin glue 6. By evenly applying the high-strength resin glue 6 to the end of the fully graded concrete specimen 7 and then bonding the fully graded concrete specimen 7 to the fixing block 5, the force on the fully graded concrete specimen 7 is made more uniform during the axial pulling process.

[0037] The lifting and telescopic cylinder 204, the axial pulling and telescopic cylinder 301, the clamping and telescopic cylinder 1 402, and the clamping and telescopic cylinder 2 403 are all hydraulic cylinders. The present invention also includes a controller, and the force sensor 302, the lifting and telescopic cylinder 204, the axial pulling and telescopic cylinder 301, the clamping and telescopic cylinder 1 402, and the clamping and telescopic cylinder 2 403 are electrically connected to the controller using existing technology.

[0038] When in use, first select fixed blocks 5 of different sizes according to different fully graded concrete specimens 7, and use high-strength resin glue 6 to glue the fixed blocks 5 at both ends of the fully graded concrete specimen 7; then use the lifting and telescopic cylinder 204 to drive the moving disc 2 to move, and the movement of the moving disc 2 drives the shaft-pulling telescopic cylinder 301 to move, and then drives the circular frame 401 to move, so as to adjust the spacing between the two symmetrically arranged circular frames 401, so as to facilitate the subsequent fully graded concrete specimen 7 to be located in the center and between the two circular frames 401. The distance between them is the same; then the two fixed blocks 5 are placed in the center of the circular frame 401 on their respective sides, and the telescopic rods of the compression telescopic cylinder 1 402 and the compression telescopic cylinder 2 403 respectively drive the arc clamping piece 1 404 to move and the arc clamping piece 2 405 to move, and the arc clamping piece 1 404 and the arc clamping piece 2 405 cooperate with each other to clamp the fixed block 5 in the center of the circular frame 401; finally, the axial tension test is carried out on the full-graded concrete specimen 7 through the compression frame and the fixed block 5 by providing the tension through the axial tension telescopic cylinder 301.

[0039] The axial tension telescopic cylinder 301 of the horizontal axial tension structure 3 can provide both axial tension and axial pressure, so that the tension-compression test of the fully graded concrete can be realized, the tension-compression cycle force of the fully graded concrete under the action of earthquake can be simulated, and the performance of the fully graded concrete under the action of cyclic tension and pressure can be explored. The fully graded concrete specimen 7 is not limited to Figure 1 , Figure 2 The shapes in the figure, arc-shaped clamping member 1 404 and arc-shaped clamping member 2 405 are not limited to the shapes in the figure and can be replaced according to actual conditions.

[0040] Therefore, the present invention adopts the above-mentioned fully-graded concrete axial tension and compression test device, and reduces the influence of gravity on the axial tension and axial pressure through the horizontally designed axial tension bracket and axial tension clamp. At the same time, the locking and fixing components can be used to fix fully-graded concrete specimens of different sizes, thereby performing axial tension and compression tests, which has a wider range of applications.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A fully graded concrete axial tension and compression test device, characterized in that: It includes a horizontally lying bracket, which includes a rectangular shell arranged horizontally, a rectangular groove is arranged in the rectangular shell, two movable discs are arranged in the rectangular groove, both sides of the movable discs are connected to the rectangular shell through a sliding structure, one side of the two movable discs is connected to a locking and fixing assembly through a horizontally lying axial pulling structure, the horizontally lying axial pulling structure is used to provide axial pulling force and axial pressure, a fixing block is arranged on the locking and fixing assembly, and the fixing block is connected to one end of the full-graded concrete specimen through an adhesive material.

2. The fully graded concrete axial tension and compression test device according to claim 1 is characterized in that: The sliding structure includes a slider, a sliding groove is arranged on the side of the rectangular shell, the slider is inserted into the sliding groove and is slidably connected with the sliding groove, plane blocks are arranged on both sides of the slider, a plane is arranged on the plane block, and the plane of the plane block is slidably connected with the side of the rectangular shell.

3. The fully graded concrete axial tension and compression test device according to claim 1 is characterized in that: The top end of the moving disc is connected with the telescopic rod of the lifting and telescopic cylinder, and the lifting and telescopic cylinder is arranged at one end of the horizontal lying bracket.

4. The fully graded concrete axial tension and compression test device according to claim 1, characterized in that: The horizontally lying axial pulling structure includes an axial pulling telescopic cylinder arranged parallel to the bottom surface of the horizontally lying bracket. The telescopic rod of the axial pulling telescopic cylinder is connected to one end of the force sensor through a ball joint, and the other end of the force sensor is connected to the locking and fixing assembly.

5. The fully graded concrete axial tension and compression test device according to claim 4 is characterized in that: The locking and fixing assembly comprises a circular frame with a circular notch, the other end of the force sensor is connected to the top center of the circular frame, and a pressing and fixing structure is symmetrically arranged on the circular frame.

6. The fully graded concrete axial tension and compression test device according to claim 5, characterized in that: The clamping and fixing structure includes a clamping and telescopic cylinder 1 and a clamping and telescopic cylinder 2. The clamping and telescopic cylinder 1 and the clamping and telescopic cylinder 2 are symmetrically arranged on the side circular surface of the circular frame. The arc-shaped clamping piece 1 and the arc-shaped clamping piece 2 are arranged in the circular groove. The clamping and telescopic cylinder 1 passes through the side circular surface of the circular frame and is connected to the arc-shaped clamping piece 1. The clamping and telescopic cylinder 2 passes through the side circular surface of the circular frame and is connected to the arc-shaped clamping piece 2. Sliding cylinders are arranged at both ends of the arc-shaped clamping piece 1. Sliding holes are arranged at both ends of the arc-shaped clamping piece 2. The sliding cylinders are inserted in the cylindrical holes and are slidably connected to the cylindrical holes. The fixing block is arranged between the arc-shaped clamping piece 1 and the arc-shaped clamping piece 2.

7. The fully graded concrete axial tension and compression test device according to claim 6, characterized in that: The first and second clamping and telescopic cylinders are both arranged on a mounting plate, on which bolts are arranged, one end of the bolts penetrates through the side circular surface of the circular frame and is locked and connected with the locking plate through a nut.

8. The fully graded concrete axial tension and compression test device according to claim 6, characterized in that: The inner sides of the arc-shaped surfaces of the arc-shaped clamping piece 1 and the arc-shaped clamping piece 2 are both provided with pressure pads.

9. The fully graded concrete axial tension and compression test device according to claim 1, characterized in that: The bonding material is resin glue, and the bottom end of the fixed block is bonded and connected to one end of the full-graded concrete specimen through the resin glue.

Images