Roadbed freeze thawing detection device

Abstract

The utility model provides a roadbed freezing and thawing detection device, which belongs to the technical field of roadbed freezing and thawing detection, and comprises a box body, a deformation pressurizing mechanism capable of moving up and down is arranged in the box body, the deformation pressurizing mechanism comprises a support frame, and the support frame is rotatably connected with a mounting block. A first detection module, a second detection module, a third detection module and a fourth detection module are respectively arranged on four surfaces of the mounting block, and the modules are connected with the mounting block through bolts. The rolling friction generated by vehicle driving, the sliding friction generated by vehicle braking and the action of sharp objects and bulges on the road surface are simulated, so that the stress state of the roadbed under the actual service condition can be truly reflected, and the performance change of the roadbed under the combined action of the freezing and thawing cycle and the external force can be accurately evaluated; and the accuracy and comprehensiveness of detection data are greatly improved.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of roadbed freeze-thaw detection, specifically a roadbed freeze-thaw detection device. Background Technology

[0002] The main function of the roadbed freeze-thaw detection device is to monitor and detect relevant parameters of the roadbed during the freeze-thaw cycle, so as to understand the freeze-thaw status of the roadbed in a timely manner, assess the stability and durability of the roadbed, and provide a scientific basis for road maintenance and management. The device mainly includes temperature monitoring equipment, moisture monitoring equipment, time domain reflectometer (TDR), frequency domain reflectometer (FDR), deformation monitoring equipment, data acquisition and transmission equipment, and data analysis and processing software.

[0003] During the freeze-thaw testing of roadbeds, it is necessary to assess the degree of deformation of roadbed samples. Currently, this is mainly achieved by applying simple forces to pressurize the roadbed surface, thereby detecting the degree of deformation. However, this method is too simplistic and does not reflect actual road conditions. In real roads, the forces acting on the roadbed are complex and diverse, including rolling and sliding friction generated by vehicle loads, as well as local stress concentrations caused by sharp objects and protrusions. Simple forces can only simulate single or relatively simple stress conditions and cannot fully reflect the stress state of the roadbed under real traffic conditions. This leads to discrepancies between the test results and the actual situation, and a lack of understanding of the complexity of the stress. Vehicle movement on the road is dynamic, and the forces they exert on the roadbed are also dynamically changing. Simple forces are often static or quasi-static, making it difficult to reflect the influence of dynamic loads on the freeze-thaw deformation of the roadbed, such as the cumulative effect of factors like loading frequency and loading rate on roadbed deformation. The lack of dynamic characteristic simulation results in inaccurate test data. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that current technologies rely on simple forces to detect the degree of roadbed deformation. Specifically, this utility model provides a roadbed freeze-thaw detection device to solve the technical problem mentioned in the background that the current methods mainly rely on simple forces to detect the degree of roadbed deformation, which are too simplistic and cannot simulate the complex stress environment of the roadbed, resulting in inaccurate detection data.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A roadbed freeze-thaw detection device includes a housing. A deformation pressurization mechanism that can move vertically is installed inside the housing. The deformation pressurization mechanism includes a support frame, on which an mounting block is rotatably connected. A first detection module, a second detection module, a third detection module, and a fourth detection module are respectively installed on the four sides of the mounting block. The modules are connected to the mounting block by bolts. The first detection module simulates the force exerted by protrusions on the road surface, the second detection module simulates the force exerted by sharp objects on the road surface, the third detection module simulates the rolling friction generated by vehicle movement, and the fourth detection module simulates the sliding friction generated by vehicle braking.

[0007] Furthermore, the first detection module includes a first connecting plate, on which multiple protrusions of different sizes are provided.

[0008] Furthermore, the second detection module includes a second connecting plate, on which multiple conical structures are provided.

[0009] Furthermore, the third detection module includes a third connecting plate, on which a first motor is mounted, and a roller is mounted at the output end of the first motor.

[0010] Furthermore, the fourth detection module includes a fourth connecting plate, which is slidably connected to a movable frame. Two friction blocks are disposed on the movable frame, and the two friction blocks are distributed in parallel.

[0011] Furthermore, a cylinder is provided on the fourth connecting plate, and the output end of the cylinder is connected to the moving frame.

[0012] Furthermore, a second motor is provided on one side of the outer wall of the support frame, and the output end of the second motor is connected to the shaft on the mounting block.

[0013] Furthermore, the box is equipped with a positioning plate for positioning the roadbed sample, and a hydraulic cylinder is provided on the upper side of the outer wall of the box, with the output end of the hydraulic cylinder connected to the interface on the support frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention, through the design of a housing, hydraulic cylinder, positioning plate, support frame, mounting block, first detection module, second detection module, third detection module, and fourth detection module, establishes a highly realistic and functional roadbed freeze-thaw testing system. In simulating vehicle operating conditions, the hydraulic cylinder, in coordination with the positioning plate, accurately simulates the continuous and stable rolling friction of a vehicle during travel. Just as a wheel rolls forward on a real road, the microscopic friction process between the tire and the road surface is meticulously reproduced, allowing the roadbed sample to continuously undergo wear tests highly consistent with actual scenarios. Simultaneously, for the critical dynamic aspect of vehicle braking, the specially constructed mounting block, in conjunction with the second detection module, realistically simulates the instantaneous and powerful sliding friction force. This not only perfectly replicates the intense friction between the tire and the ground during emergency braking but also captures the profound impact of the high-frequency impact generated during this process on the roadbed, providing precise evidence for studying the stability changes of the roadbed under braking conditions.

[0016] When focusing on the scenario of foreign object intrusion on the road surface, the third detection module is cleverly placed on the simulated road surface. Whether it is a sharp object such as a metal part that has been accidentally dropped, or a protrusion or stone formed due to road aging or construction defects, it can launch an "attack" on the roadbed in a carefully created detection environment. The system monitors and records the stress and strain distribution of the roadbed in real time when it is punctured, impacted, or squeezed by these foreign objects, and deeply analyzes how local damage gradually spreads to the overall structure, filling the gap in traditional detection when dealing with such complex stress conditions.

[0017] From the perspective of the complexity of the stress, past detection methods could only consider a single or a few simple external forces in isolation. However, this system organically integrates rolling friction, sliding friction, and the forces of sharp objects and protrusions, fully reproducing the intricate stress network faced by the roadbed in actual service. This allows the detection data to break free from one-sided limitations and comprehensively reflect the true stress situation of the roadbed.

[0018] In terms of dynamic characteristic simulation, traditional methods are mostly static or quasi-static simulations, which are difficult to capture the transient response of the roadbed during dynamic processes such as high-speed driving and frequent speed changes of vehicles. However, this application, with the flexible control of components such as hydraulic cylinders and the high-speed data acquisition capabilities of each detection module, perfectly simulates the complete dynamic process from vehicle start-up acceleration, constant speed cruising to emergency braking. It tracks every deformation and stress fluctuation of the roadbed under dynamic load with microsecond-level precision, ensuring that the detection results are in perfect agreement with the actual road conditions.

[0019] In summary, this invention, with its highly realistic simulation capabilities and precise control over complex stresses and dynamic characteristics, greatly improves the accuracy, comprehensiveness, and reliability of roadbed freeze-thaw testing data.

[0020] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the box structure of this utility model;

[0023] Figure 3 This is an exploded view of the deformation and pressurization mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the second detection module of this utility model;

[0025] Figure 5 This is a schematic diagram of the fourth detection module of this utility model.

[0026] In the diagram: 1. Box body; 2. Deformation and pressurization mechanism; 21. Support frame; 22. Mounting block; 23. First detection module; 231. First connecting plate; 232. Protrusion; 24. Second detection module; 241. Second connecting plate; 242. Conical structure; 25. Third detection module; 251. Third connecting plate; 252. Roller; 253. First motor; 26. Fourth detection module; 261. Fourth connecting plate; 262. Moving frame; 263. Friction block; 264. Cylinder; 27. Second motor; 3. Hydraulic cylinder; 4. Positioning plate. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please refer to the appendix carefully. Figure 1-5 A roadbed freeze-thaw detection device includes a housing 1. A deformation pressurizing mechanism 2, which can move vertically, is installed inside the housing 1. The deformation pressurizing mechanism 2 includes a support frame 21. A mounting block 22 is rotatably connected to the support frame 21. A first detection module 23, a second detection module 24, a third detection module 25, and a fourth detection module 26 are respectively installed on the four sides of the mounting block 22. The modules are connected to the mounting block 22 by bolts. The first detection module 23 simulates the force exerted by protrusions on the road surface, the second detection module 24 simulates the force exerted by sharp objects on the road surface, the third detection module 25 simulates the rolling friction generated by vehicle movement, and the fourth detection module 26 simulates the sliding friction generated by vehicle braking.

[0031] The above structure enables the simulation of rolling friction generated by vehicle movement, sliding friction generated by vehicle braking, and the effects of sharp objects and protrusions on the road surface (such as bumps and stones caused by uneven road surfaces) during the freeze-thaw testing of roadbed samples. This allows for a realistic reflection of the stress state of the roadbed under actual service conditions, enabling accurate assessment of the performance changes of the roadbed under the combined action of freeze-thaw cycles and these external forces. This significantly improves the accuracy and comprehensiveness of the test data, and solves the problems of insufficient stress complexity and lack of dynamic characteristic simulation in current testing methods, thus possessing certain practical value.

[0032] The specific operation is as follows: First, the roadbed sample is placed on the positioning plate 4 for positioning. Then, the hydraulic cylinder 3 is opened to push the mounting block 22 down. At the same time, with the cooperation of the second motor 27, the first detection module 23 is rotated to the bottom, so that the protrusion 232 contacts the roadbed, simulating the force of the protrusion on the road surface. After the simulation is completed, the hydraulic cylinder 3 pulls the mounting block 22 up. Then, the second motor 27 drives the second detection module 24 to the bottom. Then, the hydraulic cylinder 3 drives the mounting block 22 down again, so that the conical structure 242 in the second detection module 24 contacts the roadbed sample, simulating the effect of the sharp object on the road surface. Then, the above operation is repeated so that the third detection module 25 and the fourth detection module 26 successively contact the roadbed sample for testing, respectively simulating the rolling friction force generated by vehicle movement and the sliding friction force generated by vehicle braking on the roadbed.

[0033] Please refer to the appendix carefully. Figure 2 and attached Figure 3 A second motor 27 is provided on one side of the outer wall of the support frame 21. The output end of the second motor 27 is connected to the shaft on the mounting block 22. The second motor 27 provides driving force for the rotation of the mounting block 22, thereby achieving the function of switching modules. A positioning plate 4 for positioning roadbed samples is provided inside the box 1. A hydraulic cylinder 3 is provided on the upper side of the outer wall of the box 1, and the output end of the hydraulic cylinder 3 is connected to the interface on the support frame 21. The hydraulic cylinder 3 drives the deformation and pressurization mechanism 2 to move up and down.

[0034] Please refer to the appendix carefully. Figure 3 Appendix Figure 4 and attached Figure 5 The first detection module 23 includes a first connecting plate 231 with multiple protrusions 232 of different sizes. The first detection module 23 simulates the force exerted by protrusions on the road surface. The second detection module 24 includes a second connecting plate 241 with multiple conical structures 242. The second detection module 24 simulates the force exerted by sharp objects (such as metal parts) on the road surface. The third detection module 25 includes a third connecting plate 251 with a first motor 253. A roller 252 is located at the output end of the first motor 253. The third detection module 25 simulates the rolling friction force generated by vehicle movement on the road surface. The roller 252 is made of the same material as car tires, such as styrene-butadiene rubber, butadiene rubber, and neoprene rubber. The fourth detection module 26 includes a fourth connecting plate 261, which is slidably connected to a moving frame 262. Two friction blocks 263 are set on the moving frame 262 and are distributed in parallel. Through the fourth detection module 26, the sliding friction force generated by vehicle braking is simulated. The friction blocks 263 are also made of the same material as car tires. A cylinder 264 is set on the fourth connecting plate 261. The output end of the cylinder 264 is connected to the moving frame 262. Through the cooperation between the cylinder 264 and the moving frame 262, the friction blocks 263 are driven to move back and forth linearly on the roadbed sample.

[0035] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A subgrade freeze-thaw detection device, comprising a box (1), a deformation pressurizing mechanism (2) capable of moving up and down is arranged in the box (1), characterized in that, The shape deformation pressurizing mechanism (2) comprises a support frame (21), the support frame (21) is rotationally connected with a mounting block (22), four surfaces of the mounting block (22) are respectively provided with a first detection module (23), a second detection module (24), a third detection module (25) and a fourth detection module (26), the modules are connected with the mounting block (22) through bolts, the first detection module (23) simulates the force of protrusions on the road surface, the second detection module (24) simulates the force of sharp objects on the road surface, the third detection module (25) simulates the rolling friction force generated by vehicle driving, and the fourth detection module (26) simulates the sliding friction force generated by vehicle braking.

2. The subgrade freeze-thaw detection device according to claim 1, characterized in that, The first detection module (23) comprises a first connecting plate (231), and a plurality of protrusions (232) with different sizes are arranged on the first connecting plate (231).

3. The device for detecting freeze-thaw of subgrade according to claim 1, characterized in that, The second detection module (24) comprises a second connecting plate (241), and a plurality of conical structures (242) are arranged on the second connecting plate (241).

4. The device for detecting freeze-thaw of subgrade according to claim 1, characterized in that, The third detection module (25) comprises a third connecting plate (251), a first motor (253) is arranged on the third connecting plate (251), and a roller (252) is arranged at the output end of the first motor (253).

5. The device for detecting freeze-thaw of subgrade according to claim 1, characterized in that, The fourth detection module (26) comprises a fourth connecting plate (261), a moving frame (262) is slidably connected to the fourth connecting plate (261), two friction blocks (263) are arranged on the moving frame (262), and the two friction blocks (263) are distributed in parallel.

6. The subgrade freeze-thaw detection device according to claim 5, characterized in that, A cylinder (264) is arranged on the fourth connecting plate (261), and the output end of the cylinder (264) is connected with the moving frame (262).

7. The device for detecting freeze-thaw of subgrade according to claim 1, characterized in that, A second motor (27) is arranged on one side of the outer wall of the support frame (21), and the output end of the second motor (27) is connected with a shaft rod on the mounting block (22).

8. The device for detecting freeze-thaw of subgrade according to claim 1, characterized in that, A positioning plate (4) for positioning a roadbed sample is arranged in the box body (1), a hydraulic cylinder (3) is arranged on the upper side of the outer wall of the box body (1), and the output end of the hydraulic cylinder (3) is connected with an interface on the support frame (21).

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