Road structure model experiment device

Abstract

The utility model relates to the technical field of road structure simulation, in particular to a road structure model experiment device which comprises a foundation beam, a bottom plate is installed on the lower side of the interior of the foundation beam, an experiment cylinder is connected to the upper side of the bottom plate in a clamped mode, and a hydraulic cylinder is fixedly connected to the interior of the top end of the foundation beam. The output end of the hydraulic cylinder is fixedly connected with a loading plate, a refrigeration mechanism is mounted on the lower side in the experiment barrel, and the refrigeration mechanism comprises a placement plate, a plurality of ventilation holes, a plurality of mounting plates, a connecting pipe and a plurality of refrigeration pipes; the device has the beneficial effects that the stress performance and damage characteristics of a pavement structure under different temperature and humidity conditions, different load working conditions and different structural materials and thicknesses can be simulated, and experimental data support is provided for researching the pavement performance of the pavement structural materials and designing a long-life pavement structure; the theoretical design is matched with the performance under the actual road condition, so that the safety of the pavement structure is improved, and the service life of the pavement structure is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of road structure simulation, in particular to a road structure model experimental device. Background Art

[0002] With the continuous increase in traffic volume and vehicle axle load, as well as the influence of the external environment, the semi-rigid base layer is very prone to shrinkage and cracking, and the cracks extend upward, leading to reflective cracks. Especially in high temperature and rainy areas, water seepage in the pavement structure layer can easily cause road damage due to the "pumping" effect of vehicle loads, and easily cause rutting, congestion and other diseases, reducing the service life of the pavement structure.

[0003] The road structure model experimental device in the existing technology is generally composed of: simulated road surface, load application system, environmental simulation device, sensor and data acquisition system, and control system, which can help researchers better understand the behavior of different road structures under different conditions, optimize road design and maintenance strategies, and improve road safety and durability performance.

[0004] However, in the theoretical design of pavement structure, it is impossible to completely replicate the actual road environment, lacks actual traffic load, is limited by time scale, and is limited by environmental factors. Therefore, the theoretical design may deviate from the performance under actual road conditions, which leads to early damage of roads before the design life is reached, which not only increases additional maintenance costs, but also seriously affects traffic. Utility Model Content

[0005] The purpose of the utility model is to provide a road structure model test device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a road structure model experimental device, comprising a foundation beam, a bottom plate is installed on the lower side of the interior of the foundation beam, an experimental cylinder is clamped on the upper side of the bottom plate, a hydraulic cylinder is fixedly connected to the top of the foundation beam, a loading plate is fixedly connected to the output end of the hydraulic cylinder, and a refrigeration mechanism is installed on the lower side of the interior of the experimental cylinder.

[0007] Preferably, the refrigeration mechanism includes a placement plate, a plurality of ventilation holes, a plurality of mounting plates, a connecting pipe and a plurality of refrigeration pipes, each two of the ventilation holes are respectively connected to a refrigeration pipe, one ends of the plurality of refrigeration pipes are fixedly connected to the connecting pipe, the placement plate is fixedly connected to the top of the upper ventilation hole, and the plurality of ventilation holes are opened inside the placement plate.

[0008] Preferably, the experimental cylinder is of three-section design, and a plurality of guard plates are fixedly connected to the outside of the middle section of the experimental cylinder.

[0009] Preferably, a plurality of lifting ears are fixedly connected to the outside of the experimental tube, and a plurality of data line holes are opened on the side wall of the experimental tube.

[0010] Preferably, the inner sides of the upper and lower guard plates are respectively fitted with the upper and lower outer sides of the experimental cylinder.

[0011] Preferably, three guide bars are fixedly connected to the outside of the loading plate, and the other ends of the guide bars are connected to the inner wall of the experimental cylinder.

[0012] Preferably, a sensor is installed on the loading plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model proposes a road structure model experimental device, which can simulate the stress performance and failure characteristics of the pavement structure under different temperature and humidity conditions, different load conditions and different structural materials and thicknesses, and provide experimental data support for studying the road performance of pavement structure materials and the design of long-life pavement structures, so that the theoretical design matches the performance under actual road conditions, thereby improving the safety and service life of the pavement structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a top view of the utility model;

[0017] Figure 3 It is the structural cross-sectional view of the utility model at AA;

[0018] Figure 4 This is a schematic diagram of the structure of the test tube of the utility model;

[0019] Figure 5 This is a schematic diagram of the refrigeration mechanism structure of the utility model.

[0020] In the figure: 1. foundation beam; 2. bottom plate; 3. test tube; 4. guide strip; 5. loading plate; 6. hydraulic cylinder; 7. data line hole; 8. lifting ear; 9. guard plate; 10. refrigeration mechanism; 11. placement plate; 12. ventilation hole; 13. installation plate; 14. connecting pipe; 15. refrigeration pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] See also Figures 1 to 5 The utility model provides a technical solution: a road structure model experimental device, including a foundation beam 1, a bottom plate 2 is installed on the lower side of the foundation beam 1, an experimental cylinder 3 is clamped on the upper side of the bottom plate 2, a hydraulic cylinder 6 is fixedly connected to the top of the foundation beam 1, a loading plate 5 is fixedly connected to the output end of the hydraulic cylinder 6, and a refrigeration mechanism 10 is installed on the lower side of the interior of the experimental cylinder 3.

[0024] A through hole is opened inside the base plate 2, and its purpose is to inject water into the interior of the test cylinder 3 to simulate the influence of water on the pavement structure layer. The test cylinder 3 is clamped on the upper side of the base plate 2, so that the test cylinder 3 can be conveniently installed on the upper side of the base plate 2. The foundation beam 1 limits the hydraulic cylinder 6, so that the hydraulic cylinder 6 can apply load to the inside of the test cylinder 3 through the loading plate 5 without deviation, thereby ensuring the accuracy of the experimental data.

[0025] Embodiment 2

[0026] On the basis of Example 1, in order to simulate different experimental temperature requirements, the refrigeration mechanism 10 includes a placement plate 11, a plurality of ventilation holes 12, a plurality of mounting plates 13, a connecting pipe 14 and a plurality of refrigeration pipes 15. Every two ventilation holes 12 are respectively connected to a refrigeration pipe 15, one end of the plurality of refrigeration pipes 15 is fixedly connected to the connecting pipe 14, the placement plate 11 is fixedly connected to the top of the upper ventilation hole 12, and the plurality of ventilation holes 12 are all opened inside the placement plate 11.

[0027] By connecting the connecting pipe 14 to the external refrigeration equipment, the refrigeration equipment is started, so that the refrigerant can enter the interior of the refrigeration pipe 15. At this time, the cold air can enter the interior of the experimental cylinder 3 through the ventilation hole 12, so that the temperature can be controlled to be below -25°C to meet the experimental requirements. The refrigeration pipe 15 is a copper pipe, and a refrigeration ring is formed in a surrounding form, so that the sample temperature inside the experimental cylinder 3 is uniform. The placement plate 11 is a steel plate, which can ensure the heat conduction effect, and a plurality of support blocks are installed between the ventilation holes 12, so as to leave installation space for the refrigeration pipe 15, and can ensure that the refrigeration pipe 15 will not be crushed when the hydraulic cylinder 6 applies a load.

[0028] Embodiment 3

[0029] On the basis of the second embodiment, in order to realize convenient and accurate assembly of the experimental tube 3, the experimental tube 3 is designed in three sections, the middle section of the experimental tube 3 is fixedly connected to the outside with multiple protective plates 9, the outside of the experimental tube 3 is fixedly connected to multiple lifting ears 8, the side wall of the experimental tube 3 is provided with multiple data line holes 7, and the inner sides of the upper and lower side protective plates 9 are respectively fitted with the upper and lower outer sides of the experimental tube 3.

[0030] By connecting the middle section of the experimental cylinder 3 with the experimental cylinders 3 on the upper and lower sides, and allowing the guard plate 9 to fit on the outside of the experimental cylinder 3, the overall experimental cylinder 3 will not be offset, and then when the hydraulic cylinder 6 applies a load to the inside of the experimental cylinder 3 through the guide bar 4, the experimental cylinder 3 will not be offset, thereby further ensuring the accuracy of the experiment, and the design of the data cable hole 7 allows the data cable to pass through it, thereby facilitating data collection, and the design of the lifting ear 8 allows the experimental cylinder 3 to be conveniently lifted and assembled, thereby improving the assembly efficiency of the experimental cylinder 3 and saving experimental time.

[0031] Embodiment 4

[0032] On the basis of Example 3, in order to achieve smooth application of pressure on the loading plate 5 to ensure the accuracy of the experimental data, three guide bars 4 are fixedly connected to the outside of the loading plate 5, and the other end of the guide bar 4 is connected to the inner wall of the experimental tube 3. A sensor is installed on the loading plate 5 to detect the vertical settlement of the loading plate.

[0033] The three guide bars 4 are evenly arranged at 120 degrees. For the double-wheel axle, the loading plate 5 adopts the standard axle load BZZ-100 and a circular steel plate with an equivalent circle diameter D=0.302m. The loading plate 5 is connected to the hydraulic cylinder 6, wherein the hydraulic cylinder 6 adopts a vertical hydraulic jack, and the combined force center of the hydraulic jack coincides with the center of the loading plate 5, and a force sensor is built in the hydraulic cylinder 6 to output the load.

[0034] In actual use, the sample is prepared first, that is, the base plate 2 and the test tube 3 are assembled first, and then the pavement structure materials are loaded into the assembled test tube 3 in layers according to the design requirements, and sensors are buried at corresponding positions. The data line connected to the sensor passes through the data line hole 7 reserved on the side wall of the test tube 3 and is connected to the data acquisition box.

[0035] Secondly, experimental loading is carried out, that is, the water stability test of the pavement structure is carried out. Water can be injected into the sample and the refrigeration equipment is turned on in advance. The refrigeration mechanism 10 at the bottom of the cylinder performs refrigeration and transfers the cold air to the upper structure until the pavement structure reaches the temperature required by the experiment. The loading plate 5 is placed at the center of the top of the pavement structure, and the three guide bars 4 are placed on the outer edge of the loading plate 5. Thus, by starting the hydraulic cylinder 6, it is pre-stressed with a predetermined pressure. After pre-stressing, the position of the loading plate 5 is adjusted. At this time, a monotonic load is applied by the hydraulic cylinder 6. The loading adopts the graded maintenance load-settlement relative stability method, and is applied in stages according to equal load increments. After each level of load reaches relative stability, the next level of load is added until the loading is completed, and then the load is unloaded to zero in stages. After the test is completed, the load is unloaded, the data is saved, and the instrument is turned off.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A road structure model test device, comprising a foundation beam (1), characterized in that: A bottom plate (2) is installed on the lower inner side of the foundation beam (1), an experimental cylinder (3) is clamped on the upper side of the bottom plate (2), a hydraulic cylinder (6) is fixedly connected to the top inner side of the foundation beam (1), a loading plate (5) is fixedly connected to the output end of the hydraulic cylinder (6), and a refrigeration mechanism (10) is installed on the lower inner side of the experimental cylinder (3).

2. A road structure model test device according to claim 1, characterized in that: The refrigeration mechanism (10) comprises a placement plate (11), a plurality of ventilation holes (12), a plurality of mounting plates (13), a connecting pipe (14) and a plurality of refrigeration pipes (15); each two ventilation holes (12) are respectively connected to a refrigeration pipe (15); one end of each of the plurality of refrigeration pipes (15) is fixedly connected to the connecting pipe (14); the placement plate (11) is fixedly connected to the top of the upper ventilation hole (12); and the plurality of ventilation holes (12) are arranged inside the placement plate (11).

3. A road structure model test device according to claim 1, characterized in that: The experimental cylinder (3) is of three-section design, and a plurality of protective plates (9) are fixedly connected to the outside of the experimental cylinder (3) in the middle section.

4. A road structure model test device according to claim 3, characterized in that: The outside of the experimental tube (3) is fixedly connected with a plurality of lifting ears (8), and the side wall of the experimental tube (3) is provided with a plurality of data line holes (7).

5. A road structure model test device according to claim 3, characterized in that: The inner sides of the upper and lower guard plates (9) are respectively fitted with the outer sides of the upper and lower sides of the experimental cylinder (3).

6. A road structure model test device according to claim 1, characterized in that: The outside of the loading plate (5) is fixedly connected with three guide bars (4), and the other end of the guide bar (4) is connected to the inner wall of the test cylinder (3).

7. A road structure model test device according to claim 5, characterized in that: A sensor is installed on the loading plate (5).

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