Test support for torsion of reinforced concrete beam

Abstract

The utility model relates to the technical field of reinforced concrete beam torsion test supports, in particular to a reinforced concrete beam torsion test support which comprises two underframe assemblies, the upper ends of the underframe assemblies are detachably connected with a bearing plate, the upper end of the bearing plate is provided with a ball assembly, the upper end of the ball assembly abuts against a steel plate piece, and the upper end of the steel plate piece abuts against a steel plate. A torsion support abuts against the upper end of the steel plate piece, a clamping mechanism is installed at the upper end of the torsion support, and a rolling shaft is arranged in the clamping mechanism. The vertical load is converted into the torque through a more economical and reasonable method, the size design needs to meet the requirement that the circle center of a rotating arc coincides with the centroid of the beam section, it is guaranteed that the test beam is in a pure torsion state all the time in the loading process, meanwhile, the test piece can freely stretch out and draw back in the long-axis direction, and the test efficiency is improved. The test device can be adjusted according to the size of the beam, is more flexible and portable, and can be installed manually.

Description

Technical Field

[0001] This utility model relates to the technical field of test supports for reinforced concrete beams subjected to torsion, and in particular to a test support for reinforced concrete beams subjected to torsion. Background Technology

[0002] The shortcomings of the existing experimental setup are:

[0003] 1. Foreign experimental equipment is huge, custom-made, and expensive.

[0004] 2. If domestic testing equipment is the same as that abroad, it will inevitably suffer from problems such as excessively large experimental size, high cost, and inconvenient installation. If mechanical devices and jacks are used for loading, most of the load will be applied to the loading arm, and deformation of the loading arm will have an adverse effect on the test results.

[0005] 3. The existing test beam torsion test device is relatively large in size and inconvenient to install and use.

[0006] Therefore, improvements are needed. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a test support for torsion on reinforced concrete beams.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A test support for a reinforced concrete beam subjected to torsion includes two base frame assemblies. The upper end of each base frame assembly is detachably connected to a bearing plate. A ball bearing assembly is installed on the upper end of the bearing plate. The upper end of the ball bearing assembly abuts against a steel plate. The upper end of the steel plate abuts against a torsion bracket. A clamping mechanism is installed on the upper end of the torsion bracket. The clamping mechanism contains rollers.

[0010] The upper ends of the two rollers are provided with a test mechanism, which is connected to the clamping mechanism. The test mechanism is provided with a pressure bar frame, and the pressure bar frame is provided with a pressure mechanism.

[0011] Bearing assemblies are installed at the four corners of the upper end of the bearing plate, and the steel plate is located between the four bearing assemblies, with all four bearing assemblies abutting against the steel plate.

[0012] The upper four corners of the steel plate are each fixed with a first column.

[0013] Compared with existing technologies, this application uses a more economical and reasonable method to convert vertical loads into torque. The size design should be designed to ensure that the center of its rotation arc coincides with the centroid of the beam section, so as to ensure that the test beam is always in a pure torsional state during the loading process. At the same time, the specimen can freely expand and contract in the long axis direction. The test device can also be adjusted according to the size of the beam. The test device is more flexible and lightweight and can be installed manually.

[0014] Preferably, the clamping mechanism includes a top block and a fixing plate fixed to the upper end of the torsion bracket. Each of the four corners of the fixing plate is threaded with a screw rod. One end of each of the four screw rods is rotatably connected to a clamping plate. The roller is located between the top block and the clamping plate and is installed on the upper end of the corresponding steel plate.

[0015] Furthermore, the screw mechanism allows the clamping plate to move towards the concrete block, enabling the clamping plate and top block to work together to hold the concrete block. The roller mechanism also facilitates the movement of the concrete block, resulting in better pressure handling.

[0016] Preferably, the test mechanism includes a concrete block, with its two ends abutting against two rollers respectively. Both sides of the concrete block are fixed with protrusions, which are located at the two ends of the concrete block respectively. The upper end of the protrusion abuts against a rubber pad, and the upper end of the rubber pad abuts against a hemispherical support pad. The hemispherical support pad abuts against the pressure rod frame.

[0017] Furthermore, two protrusions are provided at both ends of the concrete block. The torsion test of the reinforced concrete beam is carried out by applying pressure to the protrusions, and the protrusions are protected by the hemispherical support pad and the rubber pad, and the effect of the applied pressure is ensured.

[0018] Preferably, the concrete block and the two protrusions are integrally formed.

[0019] Furthermore, enhance stability and avoid excessive pressure.

[0020] Preferably, the pressurizing mechanism includes a mounting frame, and a hydraulic cylinder assembly is fixed to the top of the mounting frame, with the piston rod end of the hydraulic cylinder assembly fixed to the upper end of the pressure rod frame.

[0021] Furthermore, it ensures the stable application of downward pressure.

[0022] Preferably, a support plate assembly is fixed to the upper end of the base frame assembly, the bearing plate abuts against the upper end of the support plate assembly, fastening bolts are provided through the four corners of the bearing plate, and the four fastening bolts are threaded onto the four corners of the support plate assembly respectively. A second column is installed at the upper end of the fastening bolt, and the steel plate is located between the four second column members.

[0023] Furthermore, it ensures the robustness of the connection between the support plate assembly and the load-bearing plate, and the steel plate is adequately constrained by the four second column members.

[0024] Furthermore, the connection can be secured by fastening bolts, and the position of the steel plate can be defined by four second column members.

[0025] The beneficial effects of this utility model are:

[0026] 1. During the torsion test, a vertical force is applied, and the torsion support rotates accordingly, thereby converting the vertical force into torque applied to the test beam;

[0027] 2. The test beam and test support are torsion together, which avoids the problem that the test beam cannot be guaranteed to be subjected to pure torque due to deformation of the loading section, thus ensuring high accuracy; and compared with other large test devices, this test device is lighter and more economical.

[0028] 3. In addition, during the torque test, if a simple semi-circular support is used for the torsion test, the test beam will deviate from the center line due to the torsion angle.

[0029] 4. While conducting the torsion test using a semi-circular support, a fixed steel plate and steel balls are placed at the bottom so that the lower steel plate can self-correct as the test beam moves, ensuring that the test beam remains on the center line during the test and guaranteeing the accuracy of the test results.

[0030] 5. This test apparatus also includes an adjustable clamping structure, which can be adjusted according to the size of the test beam to ensure a tight fit between the beam and the apparatus. Attached Figure Description

[0031] Figure 1 This is a structural diagram showing the placement of the concrete block in this utility model;

[0032] Figure 2 This is a structural diagram of the clamping plate, fixing plate, and screw rod in this utility model;

[0033] Figure 3 This is a side view of the present invention;

[0034] Figure 4 Appendix of this utility model Figure 1 Enlarged view of point A;

[0035] Figure 5 This is a connection structure diagram of the support plate assembly, bearing plate, and fastening bolts in this utility model;

[0036] Figure 6 This is a top view of the support plate in this utility model;

[0037] In the diagram: 1 Mounting bracket, 2 Hydraulic cylinder assembly, 3 Pressure rod bracket, 4 Hemispherical support pad, 5 Rubber pad, 6 Torsion bracket, 7 Bearing plate, 8 Base frame assembly, 9 Ball bearing assembly, 10 Steel plate, 11 Protrusion, 12 Roller, 13 Screw assembly, 14 Clamping plate, 15 Fixing plate, 16 Top block, 17 Concrete block, 18 First column assembly, 19 Second column assembly, 20 Fastening bolt assembly, 21 Bearing assembly, 22 Support plate assembly. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0039] Reference Figure 1-6 A test support for torsion of a reinforced concrete beam includes two base frame assemblies 8. The upper end of the base frame assembly 8 is detachably connected to a bearing plate 7. A ball bearing assembly 9 is installed on the upper end of the bearing plate 7. The upper end of the ball bearing assembly 9 abuts against a steel plate 10. The upper end of the steel plate 10 abuts against a torsion bracket 6. In actual operation, the bottom steel plate is placed at the bottom layer, and a square groove is set on it to place the steel balls. The upper steel plate is placed on the balls, and a semi-circular support is placed on it. Finally, the clamp assembly is fixed on top, which can effectively fix the concrete.

[0040] Reference Figure 1-6 Bearing assemblies 21 are installed at the four corners of the upper end of the bearing plate 7. The steel plate 10 is located between the four bearing assemblies 21, which can effectively abut against each other. At the same time, the inner ring of the bearing assembly 21 is fixed to the bearing plate 7, and its outer ring can rotate stably. The inner ring of the bearing assembly 21 is connected and fixed to the bearing plate 7. All four bearing assemblies 21 abut against the steel plate 10. First column members 18 are fixed at the four corners of the upper end of the steel plate 10. The first column members 18 can abut against the torsion bracket 6, which can limit the deflection of the torsion bracket 6 and prevent it from deflecting. When the torsion bracket rotates excessively, a support plate assembly 22 is fixed to the upper end of the base frame assembly 8. The bearing plate 7 abuts against the upper end of the support plate assembly 22. Fastening bolts 20 are provided through the four corners of the bearing plate 7. The four fastening bolts 20 are threaded onto the four corners of the support plate assembly 22, so that the bearing plate 7 and the support plate assembly 22 can be connected and fixed by the fastening bolts 20. A second column 19 is installed at the upper end of the fastening bolt 20. The steel plate 10 is located between the four second column 19, which can fully realize the limit operation.

[0041] Reference Figure 1-6The second column 19 can prevent the upper steel plate from flying out due to uneven force during the test; the balls are distributed in the ball assembly 9 but not completely, which prevents the balls from falling while satisfying a certain degree of freedom; the first column 18 restricts the torsion angle of the upper torsion bracket to prevent overturning due to excessive angle; the four freely rotating bearing assemblies 21 can ensure the free movement of the upper steel plate in the left and right direction (i.e., the direction of torque generation) and restrict the movement of the components in the up and down direction (in fact, no up and down force is generated in the torsion process, which is essentially to improve the stability of the components. Without this restriction, the whole device would be prone to misalignment).

[0042] Reference Figure 1-3 A clamping mechanism is installed at the upper end of the torsion bracket 6, and a roller 12 is provided inside the clamping mechanism. The clamping mechanism includes a top block 16 and a fixing plate 15 fixed to the upper end of the torsion bracket 6. Each of the four corners of the fixing plate 15 is threaded with a screw rod 13. One end of each of the four screw rods 13 is rotatably connected to a clamping plate 14. The roller 12 is located between the top block 16 and the clamping plate 14. The roller 12 is installed at the upper end of the corresponding steel plate 10. The roller 12 facilitates movement, and the four screw rods 13 can push the clamping plate 14 toward the top block 16 to clamp the reinforced concrete beam and column.

[0043] Reference Figure 1-3 The upper ends of the two rollers 12 are jointly provided with a test mechanism, which is connected to the clamping mechanism. The test mechanism is provided with a pressure rod frame 3. The test mechanism includes a concrete block 17, the two ends of which abut against the two rollers 12 respectively. Both sides of the concrete block 17 are fixed with protrusions 11, which are located at the two ends of the concrete block 17 respectively. The concrete block 17 and the two protrusions 11 are integrally formed. The upper end of the protrusion 11 abuts against a rubber pad 5, and the upper end of the rubber pad 5 abuts against a hemispherical support pad 4. The hemispherical support pad 4 abuts against the pressure rod frame 3. The two ends of the concrete block 17 are provided with two protrusions 11. The torsion test operation of the reinforced concrete beam is carried out by applying pressure to the protrusions 11. The hemispherical support pad 4 and the rubber pad 5 protect the protrusions 11 and ensure the effect of the applied pressure.

[0044] Reference Figure 1-3 The pressure rod frame 3 is equipped with a pressure mechanism; the pressure mechanism includes a mounting frame 1, and a hydraulic cylinder assembly 2 is fixed at the top inside the mounting frame 1. The piston rod end of the hydraulic cylinder assembly 2 is fixed at the upper end of the pressure rod frame 3. Pressure can be effectively applied through the hydraulic cylinder assembly 2. In actual preparation, a hand chain hoist is installed on the mounting frame 1. At the same time, the hand chain hoist is sleeved on the concrete block 17 and the mounting frame 1, which can quickly adjust the height of the reinforced concrete beam and quickly place and clamp it.

[0045] In this invention, during actual operation, when conducting a torsion test, a vertical force is applied, and the torsion support rotates accordingly, thereby converting the vertical force into torque applied to the test beam. The test beam and the test support torsion together, avoiding the problem that the test beam cannot be guaranteed to be subjected to pure torque due to deformation of the loading section, resulting in higher accuracy. Compared with other large-scale testing devices, this experimental device is lighter and more economical.

[0046] In addition, during the torque test, if a simple semi-circular support is used for the torsion test, the test beam will deviate from the center line due to the torsion angle. When using a semi-circular support for the torsion test, a fixed steel plate and steel balls are placed at the bottom so that the lower steel plate can self-correct as the test beam moves, ensuring that the test beam is always on the center line during the test and guaranteeing the accuracy of the test results.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A test support for the torsion of a reinforced concrete beam comprising two chassis assemblies (8) characterised in that: The upper end of the chassis assembly (8) is detachably connected with a bearing plate (7), the upper end of the bearing plate (7) is installed with a ball assembly (9), the upper end of the ball assembly (9) is abutted with a steel plate (10), the upper end of the steel plate (10) is abutted with a torsion support (6), the upper end of the torsion support (6) is installed with a clamping mechanism, the clamping mechanism is provided with a roller (12) therein; The upper ends of the two rollers (12) are commonly provided with a test mechanism, the test mechanism is connected with the clamping mechanism, the test mechanism is provided with a pressure rod frame (3), and the pressure rod frame (3) is provided with a pressure mechanism. The upper end of the bearing plate (7) is provided with a bearing assembly (21) at each corner, the steel plate (10) is located between the four bearing assemblies (21), and the four bearing assemblies (21) are abutted with the steel plate (10). The upper end of the steel plate (10) is fixed with a first stand column (18) at each corner.

2. A test support for the torsion of a reinforced concrete beam according to claim 1, characterised in that: The clamping mechanism comprises a top block (16) fixed to the upper end of the torsion support (6) and a fixed plate (15), the four corners of the fixed plate (15) are threadedly sleeved with screw rods (13), one end of the four screw rods (13) is commonly rotationally connected with a clamping plate (14), the roller (12) is located between the top block (16) and the clamping plate (14), and the roller (12) is installed at the upper end of the corresponding steel plate (10).

3. A test support for the torsion of a reinforced concrete beam according to claim 1, characterized in that: The test mechanism comprises a concrete block (17), the two ends of the concrete block (17) are abutted on the two rollers (12) respectively, the two sides of the concrete block (17) are fixed with protrusions (11), the two protrusions (11) are located at the two ends of the concrete block (17) respectively, the upper end of the protrusion (11) is abutted with a rubber pad (5), the upper end of the rubber pad (5) is abutted with a hemispherical support pad (4), and the hemispherical support pad (4) is abutted with the pressure rod frame (3).

4. A test support for the torsion of a reinforced concrete beam according to claim 1, characterized in that: The concrete block (17) and the two protrusions (11) are integrally formed.

5. A test support for the torsion of a reinforced concrete beam according to claim 1, characterized in that: The pressure mechanism comprises a mounting frame (1), the top of the mounting frame (1) is fixed with a hydraulic cylinder assembly (2), and the piston rod tail end of the hydraulic cylinder assembly (2) is fixed to the upper end of the pressure rod frame (3).

6. A test support for the torsion of a reinforced concrete beam according to claim 1, characterized in that: The upper end of the chassis assembly (8) is fixed with a support plate assembly (22), the bearing plate (7) is abutted on the upper end of the support plate assembly (22), the four corners of the bearing plate (7) are penetratedly provided with fastening bolt pieces (20), the four fastening bolt pieces (20) are threadedly sleeved at the four corners of the support plate assembly (22) respectively, the upper end of the fastening bolt piece (20) is installed with a second stand column (19), and the steel plate (10) is located between the four second stand columns (19).

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