Clamp for detecting vertical shear resistance of road crack pouring material

Abstract

The utility model belongs to the technical field of mechanical property detection, and discloses a road crack pouring material vertical shear resistance detection clamp which comprises a main body assembly, the main body assembly is provided with a fluted disc and a test block clamp, the fluted disc can be adjusted by four degrees every time one tooth is switched, the fluted disc is connected with a universal machine through a connecting piece, and the connecting piece comprises a clamping piece and a clamping piece. A fluted disc is arranged in the clamping piece and attached to the main body fluted disc, the clamping piece and the clamping piece are connected through an M10 bolt and fix the main body assembly, and an M16 bolt is arranged on the clamping piece and connected with a universal machine. Three M10 flat head bolts with adjustable elongation are arranged in the test block clamp and are used for fixing the test block, and the elongation is adjusted through six edges at the tail part. The clamping piece and the clamping piece are fixedly connected, a connecting piece formed by the clamping piece and the clamping piece is fixed with the main body assembly through a circumferential fluted disc, and the connecting piece is fixedly connected with the universal machine. The utility model solves the problems that the crack pouring material lacks a vertical shear resistance detection clamp, multi-angle shearing is lacked, the shearing precision is not enough, the test block is not stably fixed, and the detection result is influenced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical property detection, and particularly relates to a vertical shear resistance performance detection fixture for road crack filling materials. Background Technique

[0002] The mechanical property detection of the crack filling material is to conduct a tensile test on the crack filling material specimen. The crack filling material specimen is a hamburger-shaped specimen formed by pouring the crack filling material between two rectangular specimens made of road materials with the same cut size and waiting for it to cool and solidify. The mechanical property detection indexes of the crack filling material include a direct tensile test. The upper and lower rectangular blocks of the specimen are placed in the specimen clamp of the fixture. By using a universal testing machine, etc., the crack filling material specimen is stretched through the tensile fixture, so as to test relevant mechanical indexes.

[0003] For different types of cracks and different usage scenarios of crack filling materials, the mechanical indexes of conventional crack filling materials are insufficient and the detection means are limited. For example, road longitudinal cracks generally run along the driving direction and are distributed on both sides of the ruts. After using the crack filling material to repair them, the crack filling material will generate vertical shear stress inside under the action of the driving load, and the crack will continue to develop in the width direction, applying a horizontal tensile stress to the crack filling material. Finally, the crack filling material will be shear-fatigue damaged under the dual stresses, which is a conventional longitudinal crack failure. For such cracks, the tensile test lacks the detection of the shear resistance and shear-fatigue failure of the crack filling material, and the force applied to the specimen in the tensile test is single and cannot simulate the dual stresses of the specimen. At present, there is no special vertical shear mechanical detection fixture for longitudinal crack filling materials in China. The current mechanical property detection of crack filling materials mainly uses a tensile machine and a low-temperature tensile fixture to detect the mechanical properties of crack filling materials. This combination of mechanical detection means is single and cannot detect the shear performance of crack filling materials.

[0004] Through the above analysis, the problems and defects existing in the prior art are: the detection indexes of the conventional tensile test are insufficient. For the crack filling repair of the main road disease, longitudinal cracks, the shear fatigue detection of the crack filling material is lacking, and there is no special detection fixture produced for it on the market. Content of the Utility Model

[0005] Aiming at the problems existing in the prior art, the utility model provides a vertical shear resistance performance detection fixture for road crack filling materials, aiming to solve the problem that the detection indexes of the conventional tensile test are insufficient in the above background technique. Aiming at the main failure form of road longitudinal cracks, a new type of mechanical detection fixture is developed to measure its relevant indexes.

[0006] The present utility model is realized as follows. A vertical shear performance testing fixture for road caulking materials includes a main body assembly. The main body assembly is provided with a toothed disc and a specimen clamp. Each time a tooth of the toothed disc is switched, the angle can be adjusted by four degrees. It is connected to a universal testing machine through a connecting member. The connecting member includes a clamping member and a clamping piece. Inside the clamping member, there is a toothed disc that fits with the toothed disc of the main body. The clamping member and the clamping piece are connected and fixed to the main body assembly by an M10 bolt. The clamping piece is provided with an M16 bolt to connect to the universal testing machine. The specimen clamp is provided with three M10 flat head bolts with adjustable elongation lengths to fix the specimen, and the elongation length is adjusted by a hexagonal socket at the tail.

[0007] Furthermore, the clamping member and the clamping piece are fixedly connected.

[0008] Furthermore, the connecting member composed of the clamping member and the clamping piece is fixed to the main body assembly through a circumferential toothed disc.

[0009] Furthermore, the connecting member is fixedly connected to the universal testing machine.

[0010] Furthermore, the main body assembly is connected to the connecting member through a circumferential toothed disc and rotates through the toothed disc. Each time it can rotate 4 degrees and can rotate within 0 - 45 degrees.

[0011] Furthermore, the main body assembly is welded to the specimen clamp.

[0012] Furthermore, the specimen clamp fixes the specimen through three telescopic bolts.

[0013] Combined with the above technical solutions and the solved technical problems, the advantages and positive effects of the technical solution to be protected by the present utility model are as follows:

[0014] First, compared with traditional tensile clamps, this fixture can adjust the tensile angle of the specimen according to the toothed discs on the connecting member and the main body assembly, so as to simulate the vertical shear stress and horizontal tensile stress of the specimen. Each tooth can be adjusted by four degrees. The specimen can be fixed by three bolts on the specimen clamp to prevent deviation. One end of the bolt is a hexagonal socket for convenient tightening, and the other end is a flat head, which expands the contact area between the bolt and the specimen and prevents local damage. For the caulking material for repairing longitudinal cracks in roads, this fixture can detect its mechanical properties under the dual stresses of shear fatigue and transverse crack development, providing more targeted indicators and testing methods for the research and development of caulking materials for longitudinal crack repair.

[0015] The present utility model can adjust the tensile angle according to the toothed disc of the main body part. Zero-degree tension simulates the longitudinal shear action generated by vehicle loads. As the angle increases, it simulates the transverse force generated by the development of road cracks, and the ratio of the longitudinal force to the transverse force can be adjusted according to different angles. The most easily damaged combination can be given through testing, making up for the gap in shear performance testing.

[0016] Second, the technical solution of the present utility model fills the technical gap at home and abroad in the industry: in the field of mechanical property testing of the caulking material for repairing longitudinal cracks on roads, there is a lack of a fixture for the shear test of the caulking material test block. Since longitudinal cracks are mainly subject to longitudinal shear fatigue failure, the application of the present utility model can provide more accurate and targeted indicators for the development of the caulking material for road longitudinal cracks.

[0017] Third, the fixture for detecting the vertical shear performance of the road caulking material provided by the present utility model solves the technical problems of complex operation, low precision and limited applicability in the existing shear strength testing equipment for road materials. Through the design and application of this fixture, the following remarkable technical progress has been achieved:

[0018] 1) Precise angle adjustment: The main body assembly can achieve precise adjustment of 4 degrees per rotation through the circumferential gear disc design, with a range from 0 to 45 degrees. This meticulous angle control makes the shear strength test more precise and meets the mechanical property test requirements at different angles.

[0019] 2) Reliability of fixation and connection: The design of the clamping part and the fixture part is firmly connected by M10 bolts, ensuring the stability between the entire detection fixture and the universal testing machine, reducing errors during the test, and improving the reliability of the test results.

[0020] 3) Quick installation and disassembly: Through the design of a simple connection structure between the clamping part and the fixture part, the connection between the fixture and the universal testing machine is made faster and more convenient, facilitating quick installation and disassembly by the operator and improving work efficiency.

[0021] 4) Wide applicability: The design of the test block clamp includes three M10 flat head bolts with adjustable elongation lengths, which allows test blocks of different sizes and shapes to be fixed, enhancing the applicability of the fixture and enabling it to be applied to the shear performance tests of various types of road materials.

[0022] 5) Simplicity of operation: The design of the overall structure makes the operation more intuitive and easy to understand, thus reducing the skill requirements for the operator and improving the convenience and safety of operation.

[0023] Through these technical progress, the fixture for detecting the vertical shear performance of the road caulking material of the present utility model effectively improves the quality control standard of the road repair material before construction and provides a more scientific and accurate testing tool for road maintenance and repair. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for use in the embodiments of the present utility model. Obviously, the attached drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other attached drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is the structural diagram of the vertical shear resistance performance detection fixture for road crack filling materials provided by the embodiments of the present utility model;

[0026] Figure 2 is the structural diagram of the fixture main body assembly provided by the embodiments of the present utility model; wherein, (a) is the side bolt hole position diagram of the test block clamp, (b) is the tooth disc angle positioning diagram, (c) is the side opening positioning diagram of the test block clamp, and (d) is the bottom bolt hole position diagram of the test block clamp;

[0027] Figure 3 is the structural diagram of the clamping member provided by the embodiments of the present utility model; wherein, (a) is the front view of the clamping member, (b) is the side view of the clamping member, (c) is the plan view of the clamping member, and (d) is the three-dimensional view of the clamping member;

[0028] Figure 4 is the structural diagram of the clamping card provided by the embodiments of the present utility model; wherein, (a) is the plane positioning diagram of the tooth disc of the clamping card, (b) is the front view of the clamping card, and (c) is the rear view of the clamping card;

[0029] Figure 5 is the structural diagram of two types of bolts provided by the embodiments of the present utility model; wherein, (a) is the elevation view of the M10 flat head bolt, (b) is the elevation view of the M10 bolt, (c) is the plan view of the M10 flat head bolt, and (d) is the elevation view of the M10 bolt;

[0030] In the figure, 1, main body assembly; 2, clamping card; 3, clamping member; 4, test block clamp; 5, M10 flat head bolt; 6, main body tooth disc. Specific embodiments

[0031] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] Aiming at the problems existing in the prior art, the present utility model provides a vertical shear resistance performance detection fixture for road crack filling materials. The following describes the present utility model in detail in combination with the attached drawings.

[0033] The vertical shear resistance testing fixture of road grouting materials provided by the embodiment of the utility model includes a main body component 1, the main body component 1 is provided with a toothed disc 6 and a test block clamp 4, the toothed disc 6 can be adjusted four degrees each time a tooth is switched, and is connected to a universal machine through a connecting piece, the connecting piece includes a clamping piece 2 and a clamping piece 3, a toothed disc is provided inside the clamping piece 2 to fit with the main body toothed disc 6, the clamping piece 2 and the clamping piece 3 are connected and fixed to the main body component 1 by M10 bolts, and the clamping piece 3 is provided with M16 bolts to connect the universal machine; three M10 flat head bolts 5 with adjustable elongation length are provided in the test block clamp 4 to fix the test block, and the elongation length is adjusted by the hexagonal ribs at the tail.

[0034] The clamp 2 and the clamp 3 are fixedly connected.

[0035] The connecting piece composed of the clamping piece 2 and the clamping piece 3 is fixed to the main body component 1 through a circumferential toothed disc.

[0036] The connecting piece is fixedly connected to the universal machine.

[0037] The main body component 1 is connected to the connecting member through a circumferential toothed disc and rotates through the toothed disc, and can rotate 4 degrees each time, and can rotate within a range of 0-45 degrees.

[0038] The main body component 1 is connected to the test block clamp 4 by welding.

[0039] The test block clamp 4 fixes the test block via three retractable bolts.

[0040] Compared with the traditional tensile clamp 3, this clamp can adjust the tensile angle of the test block according to the toothed disc on the connector and the main assembly 1, thereby simulating the vertical shear stress and horizontal tensile stress of the test block. Each tooth can be adjusted by four degrees. The test block can be fixed by three bolts on the test block clamp 4 to prevent displacement. One end of the bolt has a hexagonal mouth for easy tightening, and the other end has a flat head, which expands the contact area between the bolt and the test block and prevents local damage.

[0041] The user first fixes the connector and the main components with bolts according to the required stretching angle, then connects the fixture to the universal machine with bolts, puts the test block into the test block clamp 4, and adjusts the three bolts on the test block clamp 4 to make it rest against the test block.

[0042] The utility model is applied in mechanical testing experiments of road longitudinal crack grouting materials, and shear tests are performed on water-immersed and freeze-thaw cycle test blocks to detect the shear stress of the test blocks when they crack and fail under the action of shear force after water immersion and freeze-thaw cycle.

[0043] Through the application in experiments, the present utility model detects the shear failure stress of the joint filling material specimens under the influence of various factors. By comparing with the conventional tensile failure experiment, the bond failure stress between the joint filling material and different asphalt mixtures is detected. It is found that the shear failure stress is smaller and should be included in the mechanical testing of the joint filling material. Compared with the conventional single tensile test, the mechanical testing in the shear aspect added by the present utility model is more targeted especially for the joint filling material for repairing cracks mainly caused by shear failure, providing more detailed mechanical testing indexes for the development of relevant joint filling materials.

[0044] The working principle of the vertical shear resistance performance testing fixture for road joint filling materials provided by the embodiment of the present utility model is mainly based on its structural design and the coordinated work of its components. The following is the detailed working principle:

[0045] 1) Fixture assembly and connection:

[0046] The main body component 1 is fixedly connected to the universal testing machine through a connecting member composed of a clamping member 2 and a clamping piece 3. The connecting member is internally provided with a gear disk matching the gear disk 6 of the main body component 1, so that the connecting member can be stably connected to the main body component 1 and transmit force.

[0047] The clamping member 2 and the clamping piece 3 are fixedly connected by an M10 bolt to ensure the overall stability of the connecting member.

[0048] The clamping piece 3 is provided with an M16 bolt for fixing the whole fixture on the universal testing machine for shear resistance performance testing.

[0049] 2) Specimen fixing:

[0050] The specimen clamp 4 is connected to the main body component 1 by welding to ensure the stability of the specimen clamp 4 during the test.

[0051] The specimen clamp 4 is internally provided with three M10 flat head bolts 5 with adjustable elongation lengths. These bolts adjust their elongation lengths through the hexagonal regulators at the tails to adapt to specimens of different sizes.

[0052] When the specimen is placed in the specimen clamp 4, by adjusting the elongation lengths of the three flat head bolts 5, it is in close contact with the specimen and fixes the specimen to prevent the specimen from moving or falling off during the test.

[0053] 3) Angle adjustment and testing:

[0054] The gear disk 6 on the main body component 1 matches the gear disk inside the connecting member. By rotating the gear disk 6, the angle of the fixture can be adjusted. Each time a tooth is switched, the angle of the fixture can be adjusted by four degrees, enabling the fixture to rotate within the range of 0 - 45 degrees.

[0055] When conducting the shear performance test, adjust the angle of the fixture according to the test requirements and fix the whole fixture on the universal testing machine.

[0056] Start the universal testing machine, apply a shear force in the vertical direction to the test block, and observe and record the shear performance data of the test block.

[0057] 4) Test stability and data recording:

[0058] During the test, it is necessary to closely monitor the working state of the universal testing machine to ensure the stability of the test. At the same time, adjust the parameters of the universal testing machine according to the test requirements, such as the magnitude of the shear force, the test time, etc.

[0059] After the test is completed, record the shear performance data of the test block in a timely manner, and conduct data processing and analysis. At the same time, check the states of the fixture and the test block to ensure the integrity of the fixture and the reliability of the test block.

[0060] Through the above steps and working principles, the vertical shear performance detection fixture for road caulking materials can accurately and stably test the shear performance of road caulking materials, providing strong support for the quality control and performance evaluation of road caulking materials.

[0061] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0062] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A fixture for detecting the vertical shear resistance performance of a road crack filling material, characterized in that, It includes a main body component, which is provided with a toothed disc and a specimen clamp. Each time a tooth of the toothed disc is switched, it can be adjusted by four degrees. It is connected to a universal machine through a connecting piece. The connecting piece includes a clamping part and a clamping piece. Inside the clamping part, there is a toothed disc that fits with the toothed disc of the main body. The clamping part and the clamping piece are connected and fixed to the main body component by an M10 bolt. An M16 bolt is provided on the clamping piece to connect to the universal machine; there are three M10 flat head bolts with adjustable elongation lengths in the specimen clamp to fix the specimen, and the elongation length is adjusted by a hexagonal socket at the tail.

2. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, wherein The clamping part and the clamping piece are fixedly connected.

3. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, characterized in that The connecting piece composed of the clamping part and the clamping piece is fixed to the main body component through a circumferential toothed disc.

4. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, characterized in that, The connecting piece and the universal machine are fixedly connected.

5. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, characterized in that, The main body component is connected to the connecting piece through a circumferential toothed disc and rotates through the toothed disc. Each time it can rotate 4 degrees and can rotate within 0 - 45 degrees.

6. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, wherein, The main body component and the specimen clamp are connected by welding.

7. The vertical shear resistance performance testing fixture for road crack filling materials according to claim 1, characterized in that The specimen clamp fixes the specimen through three telescopic bolts.

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