Detection device for measuring shrinkage cracking force of pavement material

Abstract

The utility model relates to a pavement material shrinkage cracking force measurement detection device, which comprises a base, two groups of end clamps, two fixed supports, two side plates, two groups of tension measurement components and an illumination heating unit, and is characterized in that the two fixed supports are respectively arranged at two ends of the base at intervals; the two end clamps are supported at the upper ends of the two fixed supports in a one-to-one correspondence mode, the two side plates are vertically fixed to the upper end of the base and located on the sides, away from each other, of the two fixed supports respectively, and the two side plates and the two end clamps are connected through the two tension measuring assemblies respectively. The illumination heating unit is erected above the two fixed supports, and the two end clamps are used for clamping the two ends of a horizontally-placed plate-shaped pavement test piece to be tested respectively. The device has the advantages of being simple and reasonable in structural design, capable of preparing pavement materials with different reinforcing methods, capable of meeting anti-crack detection tests of different road shoulder soil reinforcing methods, safe, reliable and capable of saving materials and providing convenience for test research.

Description

Technical Field

[0001] This utility model relates to the technical field of crack detection devices, and in particular to a detection device for measuring the shrinkage cracking force of road materials. Background Technology

[0002] As the surface layer of highway pavement structure in China, the construction quality and technical requirements for shoulder soil are constantly being updated with the development of a strong transportation nation. The properties of shoulder soil greatly affect the service performance of the road. Shoulder soil consolidation has always been a focus of researchers. Traditional shoulder construction involves directly laying hard shoulders, which meets requirements but is costly. Therefore, many roads use earthen shoulders, necessitating research on shoulder soil reinforcement. However, there is no effective method to reflect the road performance of earthen shoulders; only passive repair of damaged shoulders is possible, which is time-consuming, labor-intensive, and inefficient. Using a road material crack detection device can quickly verify the crack resistance effect of shoulder soil reinforcement research, thereby accelerating construction progress, saving materials and reducing costs, and minimizing later-stage road cracking.

[0003] Currently, most pavement crack detection methods involve using inspection vehicles or devices to capture images of cracks in constructed pavements, providing some assistance for subsequent pavement maintenance. However, research on the crack resistance of shoulder soil reinforcement is rare.

[0004] Therefore, it is necessary to develop a device for testing the shrinkage and cracking force of pavement materials. This device can prepare pavement materials with different reinforcement methods, meet the crack resistance testing requirements of different shoulder soil reinforcement methods, be safe and reliable, save materials, and provide a convenient crack detection device for experimental research. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a detection device for measuring the shrinkage and cracking force of road materials, which effectively overcomes the defects of the prior art.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A testing device for measuring the shrinkage and cracking force of road materials includes a base, two sets of end clamps, two fixed supports, two side plates, two sets of tensile force measuring components, and an illumination heating unit. The two fixed supports are respectively spaced apart at both ends of the base. The two sets of end clamps are respectively supported on the upper ends of the two fixed supports. The two side plates are respectively vertically fixed to the upper end of the base and located on the side away from each other of the two fixed supports. The two side plates are connected to the two sets of end clamps through a set of tensile force measuring components. The illumination heating unit is mounted above the two fixed supports. The two sets of end clamps are used to clamp the two ends of a horizontally placed plate-shaped road test specimen.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the upper end of the aforementioned fixed support is respectively embedded with a plurality of balls, and the lower end of the aforementioned end clamp is in rolling engagement with the aforementioned balls.

[0010] Furthermore, the aforementioned end clamp includes a C-shaped clamp body, a clamping plate is provided on the inner top of the clamp body, and a clamping adjustment member connected to the clamping plate is provided on the top of the clamp body. The end of the test specimen is clamped between the clamping plate and the bottom of the clamp body, and the opening sides of the clamp bodies of the two aforementioned end clamps are close to each other.

[0011] Furthermore, the clamping adjustment component includes multiple adjusting bolts, which vertically pass through the threaded holes adapted to the top of the clamp body and are threaded together. The upper end of the clamping plate is provided with a positioning sleeve, and the lower end of the adjusting bolt is inserted into the corresponding positioning sleeve.

[0012] Furthermore, the aforementioned tension measuring assembly includes a tension gauge and two lifting rings. The two lifting rings are respectively connected to the side end of the aforementioned end clamp and the corresponding side plate via ropes. The tension gauge is provided with hooks at both ends, and the hooks are connected to the two lifting rings one by one.

[0013] Furthermore, the aforementioned illumination heating unit is a tungsten lamp.

[0014] Furthermore, it also includes a temperature measurement unit, which includes temperature sensors respectively attached to the upper and lower surfaces of the test specimen, and the temperature sensors are connected to a controller.

[0015] Furthermore, it also includes a panel test specimen mold, which is mounted on the upper end of the base and is used to produce the test specimen for the road test.

[0016] Furthermore, the aforementioned panel specimen mold includes two first lateral support plates, two lateral limiting plates, and a pressure plate. The two first lateral support plates are respectively vertically mounted on the upper end of the base and are distributed in parallel at intervals. The inner sides of the two ends of the two first lateral support plates are respectively provided with vertical slots. The two lateral limiting plates are respectively vertically inserted into the slots at both ends of the two first lateral support plates from top to bottom and are respectively set perpendicular to the first lateral support plates. The first lateral support plates and the lateral limiting plates enclose a mold cavity. The pressure plate is used to press the upper part of the road surface material filled in the mold cavity. The upper end of the pressure plate is detachably equipped with lifting lugs at intervals.

[0017] Furthermore, a handle is provided on the outer side of the aforementioned lateral limiting plate.

[0018] The beneficial effects of this utility model are: the structural design is simple and reasonable, it can prepare pavement materials with different reinforcement methods, meet the crack resistance test requirements of different shoulder soil reinforcement methods, is safe and reliable, saves materials, and provides convenience for experimental research. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the road material shrinkage cracking force measuring device of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the end clamp on one side of the road material shrinkage and cracking force measuring device of this utility model, which is used in conjunction with the tensile force measuring component.

[0021] Figure 3 This is a schematic diagram of the panel specimen mold of the testing device for measuring the shrinkage and cracking force of road materials according to this utility model.

[0022] Figure 4 This is a top view of the panel specimen mold of the testing device for measuring the shrinkage and cracking force of road materials according to this utility model.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Base; 2. End clamp; 3. Fixed support; 4. Side plate; 5. Tensile force measuring component; 6. Irradiation heating unit; 7. Panel specimen mold; 21. Clamp body; 22. Clamping plate; 23. Clamping adjustment component; 31. Ball bearing; 51. Tensile gauge; 52. Lifting ring; 71. First lateral support plate; 72. Lateral limiting plate; 73. Pressure plate; 74. Lifting lug; 231. Adjusting bolt. Detailed Implementation

[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] Example: Figure 1 and 2 As shown, the road material shrinkage cracking force testing device of this embodiment includes a base 1, two sets of end clamps 2, two fixed supports 3, two side plates 4, two sets of tensile force measuring components 5, and a light-heating unit 6. The two fixed supports 3 are respectively spaced apart at both ends of the base 1. The two sets of end clamps 2 are respectively supported on the upper ends of the two fixed supports 3. The two side plates 4 are respectively vertically fixed to the upper end of the base 1 and located on the side away from each other of the two fixed supports 3. The two side plates 4 are connected to the two sets of end clamps 2 through a set of tensile force measuring components 5. The light-heating unit 6 is mounted above the two fixed supports 3. The two sets of end clamps 2 are used to clamp the two ends of the horizontally placed plate-shaped road test specimen.

[0027] The test process of the pavement material shrinkage cracking force measuring device in this embodiment is as follows:

[0028] The prepared plate-shaped road test specimen is placed horizontally between two pre-assembled end clamps 2. Both ends of the specimen are tightly attached to the two end clamps 2. Two sets of tensile force measuring components 5 are connected. Before measurement, the tensile force measuring components 5 are kept in an effective tensile state (i.e., capable of measuring a certain tensile force, which is used as the initial tensile force value). Next, the light-heating unit 6 is turned on to heat the specimen under light, simulating the cracking of road materials under normal light conditions. The temperature can be heated to the required range and stably irradiated. The irradiation time and temperature changes at different parts of the specimen can be defined according to requirements. During the process, the data from the tensile force measuring components 5 are continuously recorded. After the test, the performance of the road material specimen is analyzed based on the data. The overall structural design is simple and reasonable, capable of preparing road materials for different reinforcement methods, meeting the crack resistance testing requirements of different shoulder soil reinforcement methods, safe and reliable, material-saving, and providing convenience for experimental research.

[0029] In a preferred embodiment, the upper end of the fixed support 3 is respectively embedded with a plurality of balls 31, and the lower end of the end clamp 2 is in rolling engagement with the balls 31.

[0030] In the above implementation scheme, the purpose of the fixed support 3 is to provide support for the end clamp 2. During the shrinkage and cracking process of the specimen, the end clamp 2 will generate a relative horizontal displacement on the surface of the fixed support 3 along with the specimen. By using the rolling engagement of the ball 31 with the lower end of the end clamp 2, the frictional force during the relative displacement process can be reduced, thereby reducing the influence of frictional force on the tensile force data.

[0031] In a preferred embodiment, the end clamp 2 includes a C-shaped clamp body 21, a clamping plate 22 is provided on the inner top side of the clamp body 21, and a clamping adjustment member 23 connected to the clamping plate 22 is provided on the top of the clamp body 21. The end of the test specimen is clamped between the clamping plate 22 and the bottom of the clamp body 21, and the opening sides of the clamp bodies 21 of the two end clamps 2 are close to each other.

[0032] In the above implementation scheme, the end clamp 2 has a simple and reasonable structural design. The C-shaped clamp body 21 facilitates the insertion and clamping of the specimen end. The top wall (inner side) and bottom wall (inner side) of the end clamp 2 are both horizontal planes, and the clamping plate 22 is also a horizontal plate, which can adapt to the shape of the specimen. The clamping degree of the clamping plate 22 on the specimen end is adjusted by the clamping adjustment component 23, and the operation is relatively simple and quick.

[0033] In a preferred embodiment, the clamping adjustment member 23 includes a plurality of adjusting bolts 231, which vertically pass through the screw holes adapted to the top of the clamp body 21 and are threaded together. The upper end of the clamping plate 22 is provided with a positioning sleeve, and the lower end of the adjusting bolt 231 is inserted into the corresponding positioning sleeve.

[0034] In the above implementation scheme, by turning the adjusting bolt 231, the adjusting bolt 231 can be moved up and down, so that the clamping plate 22 can cooperate with the bottom wall of the clamping body 21 to clamp the upper and lower ends of the specimen. The operation is relatively simple.

[0035] In a preferred embodiment, the tensile measuring assembly 5 includes a tensile gauge 51 and two lifting rings 52. The two lifting rings 52 are respectively connected to the side end of the end clamp 2 and the corresponding side plate 4 by ropes. The two ends of the tensile gauge 51 are respectively provided with hooks, and are hooked to the two lifting rings 52 one by one through the hooks.

[0036] In the above implementation scheme, the two ends of the tension gauge 51 are hooked to two lifting rings 52, making assembly and disassembly very quick and convenient. Meanwhile, the lifting rings 52 are connected to the side plate 4 and the points (which can be ring-shaped components) on the side of the end clamp 2 via ropes. By adjusting the length of the ropes, the tension of the tension gauge 51 between the end clamp 2 and the side plate 4 can be adjusted, ensuring that the tension gauge 51 is in an effective tension measurement state after the connection is made and the test specimen is installed.

[0037] In this embodiment, the aforementioned illumination heating unit 6 uses a compatible tungsten lamp. This tungsten lamp is connected to a temperature controller and an external power supply, allowing adjustment of its illumination heating parameters. After turning on the tungsten lamp irradiation switch, the temperature can be heated to the required range and stabilized. The irradiation duration can be defined according to needs, and temperature changes at different parts of the specimen can be recorded. After the tungsten lamp irradiation ends, the performance of the road material specimen is analyzed based on the data.

[0038] In a preferred embodiment, a temperature measuring unit is also included, which includes temperature sensors respectively attached to the upper and lower surfaces of the test specimen, and the temperature sensors are connected to a controller.

[0039] In the above implementation scheme, multiple temperature sensors are evenly spaced on the upper and lower surfaces of the specimen to monitor the temperature change data of various parts of the specimen in real time and feed it back to the controller. This data is also an indicator for analyzing the performance of the road material specimen.

[0040] In a preferred embodiment, the system also includes a panel test specimen mold 7, which is mounted on the upper end of the base 1 and is used to produce the test specimen for the road test.

[0041] In the above implementation scheme, the entire device is equipped with a panel specimen mold 7, which facilitates the orderly conduct of the process from mold making to subsequent crack monitoring tests.

[0042] As a preferred implementation method, such as Figure 3 and 4 As shown, the panel specimen mold 7 includes two first lateral support plates 71, two lateral limiting plates 72, and a pressure plate 73. The two first lateral support plates 71 are respectively vertically mounted on the upper end of the base 1 and are distributed in parallel at intervals. The inner sides of the two ends of the two first lateral support plates 71 are respectively provided with slots vertically. The two lateral limiting plates 72 are respectively vertically inserted into the slots at both ends of the two first lateral support plates 71 from top to bottom and are respectively set perpendicular to the first lateral support plates 71. The first lateral support plates 71 and the lateral limiting plates 72 enclose a mold cavity. The pressure plate 73 is used to press the upper part of the road surface material filled in the mold cavity. The upper end of the pressure plate 73 is detachably equipped with lifting lugs 74 at intervals.

[0043] In the above implementation scheme, the panel test piece mold 7 adopts a multi-plate assembly structure design, which is convenient for installation. The first lateral support plate 71 can be provided with a side plate on the lower outer side, which is fixed to the upper end of the base 1 by bolts on the side plate. The lateral limiting plate 72 can be inserted, which is very convenient.

[0044] Taking actual production as an example, according to the specimen specifications customized by panel specimen mold 7, road material can be made into specimens 30cm long, 10cm wide, and 1cm high. After the materials are prepared according to the calculation formula, they can be completely placed into the mold capacity. Before putting in the road material, all parts of the mold need to be installed to ensure good sealing and prevent the road material from leaking out. After the road material is put in, the pressure plate 73 is placed firmly on the road material. Before using the press to form, the lifting lugs 74 of the pressure plate 73 need to be removed. After pressing the pressure plate 73 flat with the press, it needs to be pressed for 1-2 minutes before the device can be removed to ensure that the specifications of the road material are 30cm×10cm×1cm. After static pressing, it needs to stand for more than 4 hours before the device can be disassembled and the road material specimen can be taken out. Then, the curing time and curing conditions are determined according to the requirements.

[0045] In this embodiment, a handle a is provided on the outer side of the lateral limiting plate 72. This facilitates the assembly and disassembly of the lateral limiting plate 72 by operating the handle.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for detecting shrinkage cracking force in road surface materials, characterized in that: The device includes a base (1), two sets of end clamps (2), two fixed supports (3), two side plates (4), two sets of tensile measuring components (5), and a light-heating unit (6). The two fixed supports (3) are respectively spaced at both ends of the base (1). The two sets of end clamps (2) are respectively supported on the upper ends of the two fixed supports (3). The two side plates (4) are respectively vertically fixed to the upper end of the base (1) and located on the side away from each other of the two fixed supports (3). The two side plates (4) are connected to the two sets of end clamps (2) through a set of tensile measuring components (5). The light-heating unit (6) is mounted above the two fixed supports (3). The two sets of end clamps (2) are used to clamp the two ends of the horizontally placed plate-shaped test specimen.

2. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: The upper end of the fixed support (3) is respectively embedded with a plurality of balls (31), and the lower end of the end clamp (2) rolls with the balls (31).

3. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: The end clamp (2) includes a C-shaped clamp body (21), with a clamping plate (22) on the inner top side of the clamp body (21) and a clamping adjustment member (23) connected to the clamping plate (22) on the top of the clamp body (21). The end of the test specimen is clamped between the clamping plate (22) and the bottom of the clamp body (21), and the opening sides of the clamp bodies (21) of the two end clamps (2) are close to each other.

4. The detection device for measuring the shrinkage and cracking force of road materials according to claim 3, characterized in that: The clamping adjustment component (23) includes multiple adjusting bolts (231), which vertically pass through the screw holes adapted to the top of the clamp body (21) and are threaded together. The upper end of the clamping plate (22) is provided with a positioning sleeve, and the lower end of the adjusting bolt (231) is inserted into the corresponding positioning sleeve.

5. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: The tension measuring assembly (5) includes a tension gauge (51) and two lifting rings (52). The two lifting rings (52) are respectively connected to the side end of the end clamp (2) and the corresponding side plate (4) by ropes. The two ends of the tension gauge (51) are respectively provided with hooks, and are hooked to the two lifting rings (52) one by one through the hooks.

6. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: The illumination heating unit (6) is a tungsten lamp.

7. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: It also includes a temperature measuring unit, which includes temperature sensors respectively attached to the upper and lower surfaces of the test specimen, and the temperature sensors are connected to a controller.

8. The detection device for measuring the shrinkage and cracking force of road materials according to claim 1, characterized in that: It also includes a panel test specimen mold (7), which is mounted on the upper end of the base (1) and is used to make the test specimen for the road test.

9. The detection device for measuring the shrinkage and cracking force of road materials according to claim 8, characterized in that: The panel specimen mold (7) includes two first lateral support plates (71), two lateral limiting plates (72), and a pressure plate (73). The two first lateral support plates (71) are respectively vertically mounted on the upper end of the base (1) and are distributed in parallel at intervals. The inner sides of the two ends of the two first lateral support plates (71) are respectively provided with slots vertically. The two lateral limiting plates (72) are respectively vertically inserted into the slots at both ends of the two first lateral support plates (71) from top to bottom and are respectively set perpendicular to the first lateral support plates (71). The first lateral support plates (71) and the lateral limiting plates (72) enclose a mold cavity. The pressure plate (73) is used to press the upper part of the road material filled in the mold cavity. The upper end of the pressure plate (73) is detachably equipped with lifting lugs (74) at intervals.

10. A detection device for measuring the shrinkage and cracking force of road materials according to claim 9, characterized in that: The lateral limiting plate (72) is provided with a handle on its outer side.

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