Size-adjustable concrete test piece interface shear test loading clamp device

Abstract

The utility model particularly relates to a size-adjustable concrete test piece interface shear test loading clamp device which is arranged on a universal testing machine and is used for clamping concrete test pieces with different sizes. Comprising an upper base and a lower base which are oppositely arranged in a staggered mode and used for clamping the upper face and the lower face of a concrete test piece and applying a vertical load to the concrete test piece in cooperation with a universal testing machine. Sliding rails are respectively arranged on different sides of the upper base and the lower base along the horizontal direction, the upper sliding rail is opposite to the lower base, the lower sliding rail is opposite to the upper base, the upper sliding rail and the lower sliding rail are respectively provided with a supporting frame capable of being adjusted in a sliding manner, and the supporting frames on the two sides limit the left side and the right side of a concrete test piece. The device has the advantages of low test difficulty, simplicity in operation, accurate and reliable result, variable size and the like, can effectively improve the efficiency and the accuracy of the interface shear strength test of the concrete test piece, and provides favorable technical support for actual engineering.

Description

Technical Field

[0001] The utility model relates to a concrete specimen interface shear test loading fixture device, in particular to a concrete specimen interface shear test loading fixture device with adjustable size. Background Art

[0002] Concrete is widely used in construction and infrastructure projects, and its quality and performance are crucial to the safety of engineering structures. However, concrete structures often suffer from cracks and damage due to various factors, which may reduce their strength and durability, affecting the safety and reliability of the project. Therefore, it is crucial to conduct accurate and reliable testing of concrete structure damage and repair.

[0003] The interface shear test is one of the key methods to evaluate the interface bond strength of concrete. However, there are still some problems with the traditional test device, which will make the test difficult, complicated to operate, and the results are not accurate. Specifically: 1. It is not simple enough in the experimental preparation process, and manual assistance is required to facilitate the clamping of the specimen; 2. When multiple batches of specimens of different sizes need to be tested, the corresponding size of the fixture mold needs to be replaced to adapt to the specimen size; 3. After the experiment, the specimen needs to be removed together with the fixture, and then the fixture needs to be reinstalled on the testing machine for the next experiment. Summary of the invention

[0004] The utility model provides a simple, easy-to-use, accurate and reliable concrete specimen interface shear test loading fixture device to solve the above problems.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A size-adjustable concrete specimen interface shear test loading fixture device is installed on a universal testing machine and is used to clamp concrete specimens of different sizes. The device comprises an upper base and a lower base that are relatively and staggered, and are used to clamp the upper and lower surfaces of the concrete specimen and to apply a vertical load to the concrete specimen in cooperation with the universal testing machine. Slide rails are respectively arranged in the horizontal direction on different sides of the upper base and the lower base, the upper slide rail is opposite to the lower base, and the lower slide rail is opposite to the upper base. Slidable and adjustable support frames are arranged on the upper and lower slide rails, and the support frames on both sides limit the left and right sides of the concrete specimen.

[0007] Preferably, the upper base and the lower base are respectively connected to the universal testing machine via I-type connecting bolts.

[0008] Preferably, the slide rail is connected to the universal testing machine via Type II connecting bolts.

[0009] Preferably, the support frame is perpendicular to the slide rail, and the support frame slides horizontally along the slide rail through a slider connected to the bottom. The support frame is provided with a supporting roller, and the position of the slider is adjusted so that the supporting rollers on both sides respectively bear against the two side walls of concrete specimens of different sizes.

[0010] Preferably, a horizontal limit bolt is provided on the slider, and the ball bearing in the slider cannot slide by applying a vertical force, thereby achieving horizontal limit.

[0011] Preferably, the support frame includes two vertical plates, and both ends of the support roller respectively pass through the two vertical plates and are fixed by stud bolts.

[0012] The working principle of the utility model is:

[0013] Fix the upper and lower bases of the device to the universal testing machine and the test bench respectively, then place the concrete specimen in the structure formed by the upper and lower bases and adjust the position of the slider through the horizontal limit bolts so that the rollers on the support frame fit the two sides of the specimen. Adjust the universal testing machine to 2 to 5 mm above the concrete specimen, and then start the interface shear test through the universal testing machine.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. This device installs the concrete specimen in the limiting structure formed by the upper and lower bases, the support frame and the support roller, and adjusts the horizontal limiting bolt to fix the slider, which can effectively limit the horizontal displacement of the specimen and make the specimen subject to the vertical load under the action of the upper and lower bases, that is, to ensure the vertical loading of shear force, so that the interface is subjected to pure shear action, thereby accurately obtaining the real and effective shear strength, which can effectively improve the efficiency and accuracy of the shear strength test of the concrete specimen interface, and provide important technical support for the safety assessment and repair of concrete structures.

[0016] 2. On the one hand, this device can obtain the real interface shear strength, and on the other hand, it can be used repeatedly, reducing the difficulty of the test, simple operation and saving costs.

[0017] 3. When testing concrete specimens of various sizes, the device can also adjust the size of the fixture according to the concrete of different sizes to adapt to the concrete of different sizes, so as to optimize the progress of the test and speed up the progress of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view structural diagram of the device of the utility model;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the device of the utility model;

[0020] In the figure: 1-concrete specimen, 2-upper base, 3-lower base, 4-slide rail, 5-support roller, 6-type I connecting bolt, 7-slider, 8-support frame, 9-type II connecting bolt, 10-stud bolt, 11-horizontal limit bolt. DETAILED DESCRIPTION

[0021] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] A size-adjustable concrete specimen interface shear test loading fixture device is installed on a universal testing machine and is used to clamp concrete specimens 1 of different sizes. The device comprises an upper base 2 and a lower base 3 that are relatively and staggered, and are used to clamp the upper and lower surfaces of the concrete specimen and cooperate with the universal testing machine to apply a vertical load to the concrete specimen 1. Slide rails 4 are respectively provided on different sides of the upper base 2 and the lower base 3 in the horizontal direction, the upper slide rail 4 is opposite to the lower base 3, and the lower slide rail 4 is opposite to the upper base 2. Slidable and adjustable support frames 8 are provided on the upper and lower slide rails 4, and the support frames 8 on both sides limit the left and right sides of the concrete specimen.

[0024] Specifically, the upper base 2 and the lower base 3 are connected to the universal testing machine through I-type connecting bolts 6. The I-type connecting bolts 6 are hexagon socket bolts with a size of M10*50. The material of the I-type connecting bolts 6 is 304 steel, which has good comprehensive performance (corrosion resistance and formability). Figure 1-2 As shown, the number of I-type connecting bolts 6 is selected for connection according to actual conditions.

[0025] Specifically, the slide rail 4 is connected to the universal testing machine through a II-type connecting bolt 9. The II-type connecting bolt 9 is a hexagon socket bolt with a size of M4*25. The material of the II-type connecting bolt 9 is 304 steel.

[0026] The upper base 2 and the lower base 3 are moved vertically by the universal testing machine, and the vertical movement of the concrete specimen 1 is limited by the relative action of the upper base 2 and the lower base 3, so that the position of the concrete specimen 1 remains fixed without displacement during the test, thereby ensuring the accuracy of the data. By adjusting the vertical displacement of the universal testing machine, the purpose of adapting to concrete of different sizes (heights) can be achieved.

[0027] Specifically, the support frame 8 is perpendicular to the slide rail 4, and the support frame 8 slides horizontally along the slide rail 4 through a slider 7 connected to the bottom. The support frame 8 is provided with a supporting roller 5. The position of the slider 7 is adjusted so that the supporting rollers 5 on both sides respectively bear against the two side walls of the concrete specimens 1 of different sizes.

[0028] The slider 7 is provided with a horizontal limit bolt 11, which prevents the ball in the slider 7 from sliding by applying a vertical force, thereby achieving horizontal limit. The depth of the horizontal limit bolt 11 is adjusted to limit the movement of the ball in the slider 7, and the horizontal sliding of the slider 7 on the slide rail 4 is limited, thereby limiting the horizontal movement of the support roller 5 and preventing the horizontal displacement of the concrete specimen 1. At the same time, the slidable adjustment method also facilitates the placement and removal of the concrete specimen 1, thereby achieving the purpose of adapting to concrete of different sizes (widths).

[0029] The support frame 8 includes two vertical plates, and the two ends of the support roller 5 pass through the two vertical plates and are fixed by stud bolts 10. Figure 1-2 As shown, in this embodiment, two slide rails 4 are arranged on each side, a support frame 8 is arranged on each slide rail 4, and two supporting rollers 5 are arranged on each support frame 8. The supporting rollers 5 are not only convenient for adjustment, but also have a small contact surface with the concrete specimen 1, which can reduce damage to the concrete specimen 1 while limiting the position.

[0030] The material of the upper base 2, the lower base 3, the slide rail 4 and the support roller 5 is 45# medium carbon steel. 45# medium carbon steel has high strength and bending resistance, and is more suitable for use as the material of the test loading fixture device.

[0031] More specifically, in this embodiment:

[0032] Tighten the upper base 2 and lower base 3 to the universal testing machine and test bench using a suitable hexagonal wrench, ensuring they are firmly fixed.

[0033] Next, carefully install the concrete specimen 1 into the upper and lower bases, with the upper base 2 in contact with the right half of the upper surface of the concrete specimen 1, and the lower base 3 in contact with the left half of the lower surface of the concrete specimen 1, ensuring that the bottom of the specimen is flush with the base surface to ensure the accuracy of the test.

[0034] Then, the position of the slider 7 is gradually adjusted to drive the adjustment of the support frame 8, so that the support roller 5 is closely fitted to the side wall of the specimen, and the horizontal movement of the slider 7 on the slide rail 4 is limited by adjusting the penetration depth of the horizontal limit bolt 11 to adapt to the width of concrete specimens of different sizes.

[0035] Next, use the universal testing machine control panel or operating handle to accurately adjust the position of the testing machine to ensure that it is 2 to 5 mm above the concrete specimen for subsequent testing steps.

[0036] After everything is ready, start the universal testing machine to perform the interface shear test, and observe and record any abnormal conditions during the test to ensure the accuracy and reliability of the test data.

[0037] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make modifications, substitutions and deformations within the technical scope disclosed by the present invention without departing from the spirit and principles of the present invention.

Claims

1. A size-adjustable concrete specimen interface shear test loading fixture device, installed on a universal testing machine, used to clamp concrete specimens (1) of different sizes, characterized in that: The invention comprises an upper base (2) and a lower base (3) which are arranged oppositely and offset, and are used for clamping the upper and lower surfaces of a concrete specimen, and cooperating with a universal testing machine to apply a vertical load to the concrete specimen (1); slide rails (4) are respectively arranged on different sides of the upper base (2) and the lower base (3) in the horizontal direction, the upper slide rail (4) is opposite to the lower base (3), and the lower slide rail (4) is opposite to the upper base (2); and slidably adjustable support frames (8) are arranged on the upper and lower slide rails (4), and the support frames (8) on both sides limit the left and right sides of the concrete specimen.

2. A size-adjustable concrete specimen interface shear test loading fixture device according to claim 1, characterized in that: The upper base (2) and the lower base (3) are respectively connected to the universal testing machine via I-type connecting bolts (6).

3. The size-adjustable concrete specimen interface shear test loading fixture device according to claim 1, characterized in that: The slide rail (4) is connected to the universal testing machine via a II-type connecting bolt (9).

4. The size-adjustable concrete specimen interface shear test loading fixture device according to claim 1, characterized in that: The support frame (8) is perpendicular to the slide rail (4), and the support frame (8) slides horizontally along the slide rail (4) through a slider (7) connected to the bottom. The support frame (8) is provided with a supporting roller (5), and the position of the slider (7) is adjusted so that the supporting rollers (5) on both sides respectively abut against the two side walls of concrete specimens (1) of different sizes.

5. The size-adjustable concrete specimen interface shear test loading fixture device according to claim 4, characterized in that: The slider (7) is provided with a horizontal limit bolt (11), which prevents the ball bearing in the slider (7) from sliding by applying a vertical force, thereby achieving horizontal limit.

6. The size-adjustable concrete specimen interface shear test loading fixture device according to claim 4, characterized in that: The support frame (8) comprises two vertical plates, and the two ends of the support roller (5) pass through the two vertical plates respectively and are fixed by stud bolts (10).

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