Concrete composite structure test piece oblique shearing clamp for universal testing machine

Abstract

The utility model discloses a concrete composite structure test piece oblique shearing clamp for a universal testing machine, which belongs to the field of concrete strength detection and comprises an upper clamp and a lower clamp, the upper clamp comprises a top plate and an upper oblique groove block connected with the top plate through a bolt, and the lower clamp comprises a lower oblique groove block connected with the top plate through a bolt. The upper clamp comprises an upper inclined groove block and a lower inclined groove block, the lower clamp comprises a bottom plate and a lower inclined groove block connected with the bottom plate through a bolt, the upper inclined groove block and the lower inclined groove block are arranged in a complementary butt joint mode, and the upper inclined groove block and the lower inclined groove block are each provided with an inner groove for containing a concrete composite structure test piece. According to the concrete composite structure test piece oblique shearing clamp for the universal testing machine, the structure is simple, the operation is easy, a testing device can be directly arranged on a testing table for testing at different testing rates and testing temperatures, and the universal testing machine does not need to be connected through a connecting device.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete strength detection, in particular to an oblique shearing fixture for concrete composite structure test pieces used in a universal testing machine. Background Art

[0002] In tunnel engineering, tunnels are often located in various terrain and geological conditions, and their stress states are complex. During the construction and operation of tunnels, they are easily affected by various factors such as geological environment, construction progress, material quality, blasting operations and construction technology, and cracks are easily generated in the tunnel lining. By exploring the mechanical properties of the interface between the initial support and secondary lining concrete layers of the tunnel, it is of great significance to provide theoretical guidance for the treatment of tunnel lining cracks and improve the construction quality of tunnel support.

[0003] At present, there are few oblique shear devices specifically for testing the interlaminar shear strength of concrete composite structure specimens, especially fewer oblique shear test fixtures that can be used by universal testing machines. Therefore, an oblique shear fixture that can be used by a universal testing machine and is used to test the shear performance of concrete composite structure specimens is proposed. Utility Model Content

[0004] The utility model aims to provide a concrete composite structure test piece oblique shear fixture for a universal testing machine, which solves the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a concrete composite structure specimen oblique shear fixture for a universal testing machine, comprising an upper fixture and a lower fixture, the upper fixture comprising a top plate and an upper oblique slot block connected to the top plate by bolts, the lower fixture comprising a bottom plate and a lower oblique slot block connected to the bottom plate by bolts, the upper oblique slot block and the lower oblique slot block are complementary and butt-jointed, the upper oblique slot block and the lower oblique slot block are both provided with inner grooves for placing the concrete composite structure specimen, the upper oblique slot block and the lower oblique slot block both comprise a first fixing plate, a second fixing plate and a third fixing plate, the second fixing plate and the third fixing plate are both connected to the first fixing plate.

[0006] Preferably, the concrete composite structure specimen includes a secondary lining concrete layer and an initial support concrete layer.

[0007] Preferably, the second fixing plate is in the shape of a right-angled triangle, the right-angled surface of the second fixing plate is fixedly connected to the first fixing plate, and the inner groove is arranged on the inclined surface of the second fixing plate.

[0008] Preferably, the third fixing plate is in the shape of a right-angled trapezoid, the inclined surface of the third fixing plate is fixedly connected to the first fixing plate, and the second fixing plate abuts against the third fixing plate, and the abutting angle is 90°.

[0009] Preferably, the secondary lining concrete layer and the initial support concrete layer are respectively fixed to the third fixing plate of the upper chute block and the third fixing plate of the lower chute block by specimen fixing bolts.

[0010] Therefore, the utility model adopts the above structure to provide a concrete composite structure specimen oblique shear fixture for a universal testing machine, which has the following beneficial effects:

[0011] (1) An upper fixture and a lower fixture are provided, and a concrete composite structure test block is placed between the upper and lower fixtures. The test block, the upper inclined slot block of the upper fixture, and the lower inclined slot block of the lower fixture are complementary and butt-jointed, and the test block is fixed with a test block fixing bolt to ensure the stability of the structure when an oblique shear pressure is applied;

[0012] (2) The top plate of the upper fixture and the upper inclined slot block and the lower inclined slot block of the lower fixture can be separated by bolts, which is convenient for replacing the upper and lower inclined slot blocks with different inclination angles, thereby providing a suitable shear angle for adapting to the needs of the oblique shear test;

[0013] (3) The structure is simple and easy to operate. The test device can be directly placed on the test bench for testing at different test rates and test temperatures. There is no need to use a connecting device to connect to the universal testing machine.

[0014] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of an oblique shear fixture for concrete composite structure specimens used in a universal testing machine of the utility model;

[0016] Figure 2 It is a schematic diagram of a concrete composite structure specimen structure of an embodiment of a concrete composite structure specimen oblique shear fixture for a universal testing machine of the utility model;

[0017] Figure 3 It is a schematic structural diagram of upper and lower inclined slot blocks of an embodiment of an inclined shear fixture for concrete composite structure specimens used in a universal testing machine of the utility model;

[0018] Reference numerals

[0019] 1. Top plate; 2. Bottom plate; 3. Upper chute block; 4. Lower chute block; 5. Concrete composite structure specimen; 6. Bolts; 7. Specimen fixing bolts; 8. First fixing plate; 9. Second fixing plate; 10. Third fixing plate; 11. Secondary lining concrete layer; 12. Initial support concrete layer. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] Example 1

[0023] Reference Figure 1-3 A concrete composite structure specimen oblique shear fixture for a universal testing machine has a simple structure and is easy to operate. The test device can be directly placed on a test bench for testing at different test rates and test temperatures, and no connection device is required to connect the universal testing machine. The fixture comprises an upper fixture and a lower fixture. The upper fixture comprises a top plate 1 and an upper oblique slot block 3 connected to the top plate 1 by bolts 6. The lower fixture comprises a bottom plate 2 and a lower oblique slot block 4 connected to the bottom plate 2 by bolts 6. Internal screw holes are provided on the bottom plate 2 and the top plate 1. The nuts of the bolts are embedded in the bottom plate 2. In the inner screw hole, ensure that the contact surface between the top plate 1 and the bottom plate 2 and the universal testing machine is horizontal and smooth without protrusions. The upper chute block 3 and the lower chute block 4 are complementary and docked. The upper chute block 3 and the lower chute block 4 are both provided with inner grooves for placing the concrete composite structure specimen 5. The inner groove docking surfaces are provided with different inclination angles. According to the inclination angle of the docking surface, the upper chute block 3 and the lower chute block 4 are grouped. The first fixing plate 8, the second fixing plate 9 and the third fixing plate 10 are both connected to the first fixing plate 8.

[0024] The concrete composite structure specimen 5 includes a secondary lining concrete layer 11 and an initial support concrete layer 12. The concrete composite structure specimen 5 is a cubic specimen manufactured and cured according to the marked method.

[0025] The second fixing plate 9 is in the shape of a right-angled triangle. The right-angled surface of the second fixing plate 9 is fixedly connected to the first fixing plate 8 , and the inner groove is arranged on the inclined surface of the second fixing plate 9 .

[0026] The third fixing plate 10 is in the shape of a right-angled trapezoid. The inclined surface of the third fixing plate 10 is fixedly connected to the first fixing plate 8. The second fixing plate 9 abuts against the third fixing plate 10, and the abutting angle is 90°.

[0027] The secondary lining concrete layer 11 and the initial support concrete layer 12 are respectively fixed to the third fixing plate 10 of the upper chute block 3 and the third fixing plate 10 of the lower chute block 4 through the specimen fixing bolts 7 to ensure the stability of the structure when the oblique shear pressure is applied.

[0028] Working principle: When conducting an oblique shear test on a universal testing machine, first determine the inclination angle required for the oblique shear test, select the upper oblique slot block 3 and the lower oblique slot block 4 with appropriate inclination angles and fix them on the top plate 1 and the bottom plate 2 through bolts 6; then place the concrete composite structure specimen 5 in the inner grooves of the upper oblique slot block 3 and the lower oblique slot block 4, and fix the specimen by tightening the specimen fixing bolts 7; then place the assembled test device on the universal testing machine, and according to the set test parameters, pressurize the top plate 1 and the bottom plate 2 in the vertical direction to conduct an oblique shear test. During the pressurization process, along the inclination angle direction of the inner groove, the upper oblique slot block 3 and the lower oblique slot block 4 will be obliquely displaced, causing the concrete composite structure specimen 5 to be sheared and damaged, and then stop the test and record the experimental data. After completing this test, you can repeat the above steps to select upper oblique slot blocks 3 and lower oblique slot blocks 4 with different inclination angles to conduct a variety of shear tests not greater than 90°.

[0029] Therefore, the utility model provides the above-mentioned oblique shear fixture for concrete composite structure specimens used in a universal testing machine, which has a simple structure and is easy to operate. The test device can be directly placed on the test bench for testing at different test rates and test temperatures, without the need to use a connecting device to connect to the universal testing machine.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model 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 utility model.

Claims

1. A concrete composite structure specimen oblique shear fixture for a universal testing machine, characterized in that: It comprises an upper fixture and a lower fixture, wherein the upper fixture comprises a top plate and an upper chute block connected to the top plate by bolts, and the lower fixture comprises a bottom plate and a lower chute block connected to the bottom plate by bolts, the upper chute block and the lower chute block are complementary and docked, and the upper chute block and the lower chute block are both provided with inner grooves for placing concrete composite structure specimens, and the upper chute block and the lower chute block both comprise a first fixing plate, a second fixing plate and a third fixing plate, and the second fixing plate and the third fixing plate are both connected to the first fixing plate.

2. The oblique shear fixture for concrete composite structure specimens used in a universal testing machine according to claim 1, characterized in that: The concrete composite structure specimen comprises a secondary lining concrete layer and an initial supporting concrete layer.

3. The oblique shear fixture for concrete composite structure specimens used in a universal testing machine according to claim 2, characterized in that: The second fixing plate is in the shape of a right-angled triangle, the right-angled surface of the second fixing plate is fixedly connected to the first fixing plate, and the inner groove is arranged on the inclined surface of the second fixing plate.

4. The oblique shear fixture for concrete composite structure specimens used in a universal testing machine according to claim 3, characterized in that: The third fixing plate is in the shape of a right-angled trapezoid. The inclined surface of the third fixing plate is fixedly connected to the first fixing plate. The second fixing plate abuts against the third fixing plate, and the abutting angle is 90°.

5. The oblique shear fixture for concrete composite structure specimens used in a universal testing machine according to claim 4, characterized in that: The secondary lining concrete layer and the initial support concrete layer are respectively fixed to the third fixing plate of the upper chute block and the third fixing plate of the lower chute block by specimen fixing bolts.

Images