Pavement structure multi-field variable-speed loading mechanical response detection device

Abstract

The invention relates to a pavement structure multi-field variable-speed loading mechanical response detection device. The device comprises a supporting table; a bracket; the load applying structure is mounted on the bracket; the load application simulation structure is mounted at the free end of the load applying structure and can be driven by the load applying structure to reciprocate in the vertical direction; the pavement structure sample is supported on the supporting table and is positioned below the load application simulation structure; the load application simulation structure is in contact with the pavement structure sample under the driving of the load application structure, and the pavement structure sample is subjected to cyclic acceleration loading and pressing from one end to the other end after contact; a pressure sensor for detecting the pressure of the load application simulation structure and a stress-strain sensor for detecting the stress-strain condition of the pavement structure sample are arranged on the pavement structure sample. The device and the method are suitable for stress-strain detection of integral pavement structures with different thickness combinations, can realize temperature and water control functions, and simulate real use conditions of the integral pavement structures.

Description

Technical Field

[0001] The present invention relates to the technical field of stress and strain detection of road pavement structures, and in particular to a multi-field variable speed loading mechanical response detection device for pavement structures. Background Art

[0002] At present, small-scale accelerated loading test equipment (i.e., road pavement stress-strain test equipment) is only suitable for the selection of specimens for a single structural layer, and the distance of the loading test is relatively short. It cannot truly simulate the stress conditions of the pavement structure during the vehicle's driving on the road, and it cannot simulate the stress conditions of the pavement structure under various temperatures and rain conditions based on the above conditions. The traditional scheme does not consider the temperature gradient of the overall pavement structure along the depth direction and the influence of the pavement seepage on the stress and strain of the pavement structure, and the cost of the traditional test and detection is relatively high. Summary of the invention

[0003] The purpose of the present invention is to solve at least one technical problem in the background technology and to provide a multi-field variable speed loading mechanical response detection device for a pavement structure.

[0004] To achieve the above-mentioned purpose, the present invention provides a multi-field variable speed loading mechanical response detection device for pavement structure, comprising:

[0005] Support table;

[0006] A bracket, supported on the support platform;

[0007] A load applying structure is mounted on the support and can reciprocate in the vertical direction;

[0008] A load application simulation structure is installed at the free end of the load application structure and can reciprocate along the vertical direction under the drive of the load application structure;

[0009] a pavement structure specimen supported on the support platform and located below the load application simulation structure;

[0010] The load application simulation structure is driven by the load application structure to contact the pavement structure sample, and after contact, the pavement structure sample is subjected to cyclic accelerated loading and pressure from one end to the other end;

[0011] The pavement structure sample is provided with a pressure sensor for detecting the pressure of the load application simulation structure and a stress strain sensor for detecting its own stress and strain conditions.

[0012] According to one aspect of the present invention, the support comprises: 4 height-adjustable legs and a follower frame supported on each of the legs;

[0013] The follower frame includes: a plurality of mounting frames, a first horizontal frame, a second horizontal frame, a first vertical frame and a second vertical frame;

[0014] Each of the mounting frames is fixedly mounted between two of the legs;

[0015] The first cross frame and the second cross frame are supported in parallel and oppositely on two opposite mounting frames;

[0016] The first vertical frame and the second vertical frame are parallel to each other and vertically supported at a distance from each other at the top center of the first horizontal frame and the second horizontal frame.

[0017] According to one aspect of the present invention, the load applying structure includes: 4 driving electric cylinders, each of which is supported on the bottom surface of the end of the first longitudinal frame and the second longitudinal frame.

[0018] According to one aspect of the present invention, the load application simulation structure comprises: a conveyor belt structure and a plurality of simulated vehicle tires;

[0019] The conveyor belt structure is installed at the inner center of the free ends of the four driving electric cylinders;

[0020] The simulated vehicle tires are arranged on the conveyor belt structure at intervals and can move back and forth along with the conveyor belt.

[0021] According to one aspect of the present invention, it also includes: a temperature control structure and a humidity control structure;

[0022] The temperature control structure and the water control structure cooperate with the pavement structure sample respectively to control the temperature and humidity of the pavement structure sample.

[0023] According to one aspect of the present invention, the pavement structure sample is also provided with sensors for detecting its own temperature domain and humidity domain.

[0024] According to one scheme of the present invention, a multi-field variable-speed loading mechanical response detection device for a pavement structure comprises: a support platform; a bracket supported on the support platform; a load application structure installed on the bracket and capable of reciprocating in the vertical direction; a load application simulation structure installed at the free end of the load application structure and capable of reciprocating in the vertical direction under the drive of the load application structure; a pavement structure specimen supported on the support platform and located below the load application simulation structure; the load application simulation structure contacts the pavement structure specimen under the drive of the load application structure, and after contact, the pavement structure specimen is cyclically moved from one end to the other to apply pressure; the pavement structure specimen is provided with a pressure sensor for detecting the pressure of the load application simulation structure and a stress strain sensor for detecting its own stress and strain conditions. With such a configuration, the load application simulation structure can be driven by the load application structure to cyclically apply pressure to the pavement structure sample from one end to the other, thereby simulating the driving process of a vehicle on the road surface, and then the stress and strain sensor embedded in the pavement structure sample is used to detect and output the stress and strain of the pavement structure sample, which can provide accurate and reliable data reference for the subsequent optimization of the pavement structure and provide theoretical support for the selection of the pavement structure. Moreover, during the simulation experiment, different loads can be applied to the pavement structure sample by driving the load application simulation structure to move up and down to simulate the pressure generated when vehicles of different weights drive over the road surface, and then the pressure sensor on the pavement structure sample is used to detect whether the pressure meets the requirements.

[0025] According to one solution of the present invention, the bracket includes: 4 adjustable height legs and a follower frame supported on each leg; the follower frame includes: multiple mounting frames, a first horizontal frame, a second horizontal frame, a first vertical frame and a second vertical frame; each mounting frame is fixedly installed between two legs; the first horizontal frame and the second horizontal frame are supported on two opposite mounting frames in parallel and oppositely; the first vertical frame and the second vertical frame are supported vertically at the top center of the first horizontal frame and the second horizontal frame in parallel and at intervals. With such an arrangement, the support height can be adjusted through the legs to adapt to different test conditions and scenarios. The load application structure and the load application simulation structure can be stably supported through the arrangement of the follower frame, so that the overall structure is stable and reliable during the test and detection process, deformation is avoided, and the service life is guaranteed.

[0026] According to one solution of the present invention, the load application structure includes: 4 driving electric cylinders, each of which is supported on the bottom surface of the end of the first longitudinal frame and the second longitudinal frame. In this way, the driving electric cylinders can be used to quickly drive the load application simulation structure up and down, quickly adjust the pressure on the pavement structure sample, and effectively improve the test efficiency.

[0027] According to one solution of the present invention, the load application simulation structure includes: a conveyor belt structure and multiple simulated vehicle tires; the conveyor belt structure is installed at the inner center of the free end of the four driving electric cylinders; each simulated vehicle tire is arranged on the conveyor belt structure at intervals, and can move back and forth with the conveyor belt. With such a configuration, the conveyor belt on the conveyor belt structure can drive multiple simulated vehicle tires to move in a circular manner, so that a simulation test of multiple vehicles passing by continuously can be realized on the pavement structure sample, effectively simulating the stress conditions of each structural layer of the overall pavement under a real environment, and solving the problem that the traditional solution cannot truly simulate the stress conditions of the pavement structure during the vehicle driving on the pavement because the distance of the loading test is short.

[0028] According to one embodiment of the present invention, the pavement structure multi-field variable speed loading mechanical response detection device of the present invention also includes: a temperature control structure and a humidity control structure; the temperature control structure and the humidity control structure cooperate with the pavement structure sample respectively to control the temperature and humidity of the pavement structure sample. In the present invention, the temperature control structure can be any device or instrument that can change the temperature of the pavement structure sample, as long as the temperature of the pavement structure sample can be changed according to demand, and a simulation test can be performed at a specific temperature. The humidity control structure can be any device or instrument that can change the humidity of the pavement structure sample, as long as the humidity of the pavement structure sample can be changed according to demand, and a simulation test can be performed at a specific humidity. Such a setting can enable the present invention to simulate the vehicle load pressure of the pavement surface layer under various temperatures and rain conditions, so that the present invention can realize the experimental detection of the stress and strain of the pavement structure when there is a temperature gradient in the depth direction of the overall pavement structure and the pavement seepage condition.

[0029] According to the above scheme of the present invention, the present invention is suitable for overall pavement structures with different thickness combinations. The setting of the conveyor belt effectively extends the loading distance, and the present invention can realize the functions of temperature and water control (humidity control), simulate the actual use of the overall pavement structure, analyze the test results (stress and strain conditions of the pavement), and optimize the pavement structure design scheme, with low test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram schematically shows the structural arrangement of a multi-field variable speed loading mechanical response detection device for a pavement structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to enable those skilled in the art to better understand and thus implement the present invention, rather than implying any limitation on the scope of the present invention.

[0032] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0033] Figure 1 A schematic diagram showing the structural arrangement of a multi-field variable speed loading mechanical response detection device for a pavement structure according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, in this embodiment, the multi-field variable speed loading mechanical response detection device for pavement structure includes:

[0034] Support table 1;

[0035] A bracket 2, supported on the support platform 1;

[0036] The load applying structure 3 is mounted on the bracket 2 and can reciprocate in the vertical direction;

[0037] The load application simulation structure 4 is installed at the free end of the load application structure 3 and can reciprocate along the vertical direction under the drive of the load application structure 3;

[0038] A pavement structure specimen 5 is supported on a support platform 1 and is located below a load application simulation structure 4;

[0039] The load application simulation structure 4 is driven by the load application structure 3 to contact the pavement structure sample 5, and after contact, cyclic accelerated loading and pressure are applied to the pavement structure sample 5 from one end to the other end;

[0040] The pavement structure sample 5 is provided with a pressure sensor for detecting the pressure of the load application simulation structure 4 and a stress strain sensor for detecting its own stress and strain. With such a configuration, the load application simulation structure 4 can be driven by the load application structure 3 to cyclically apply pressure to the pavement structure sample 5 from the left end to the right end in the figure, thereby simulating the driving process of a vehicle on the road surface, and then the stress and strain sensor buried in the pavement structure sample 5 is used to detect and output the stress and strain of the pavement structure sample 5, so as to provide accurate and reliable data reference for the subsequent optimization of the pavement structure and provide theoretical support for the selection of the pavement structure. Moreover, during the simulation experiment, different loads can be applied to the pavement structure sample 5 by driving the load application simulation structure 4 to move up and down by the load application structure 3 to simulate the pressure generated when vehicles of different weights travel over the road surface, and then the pressure sensor on the pavement structure sample 5 is used to detect whether the pressure meets the requirements.

[0041] Furthermore, if Figure 1As shown, in this embodiment, the bracket 2 includes: 4 height-adjustable legs 6 and a follower frame 7 supported on each leg 6;

[0042] The follower frame 7 includes: a plurality of mounting frames 8, a first horizontal frame 9, a second horizontal frame 10, a first vertical frame 11 and a second vertical frame 12;

[0043] Each mounting frame 8 is fixedly mounted between two legs 6;

[0044] The first cross frame 9 and the second cross frame 10 are supported on two opposite mounting frames 8 in parallel and oppositely;

[0045] The first longitudinal frame 11 and the second longitudinal frame 12 are parallel to each other and are vertically supported at intervals on the top center of the first horizontal frame 9 and the second horizontal frame 10. In this way, the support height can be adjusted by the legs 6 to adapt to different test conditions and scenes, and the load application structure 3 and the load application simulation structure 4 can be stably supported by the follower frame 7, so that the overall structure is stable and reliable during the test and detection process, deformation is avoided, and the service life is guaranteed.

[0046] Furthermore, if Figure 1 As shown, in this embodiment, the load application structure 3 includes: 4 driving electric cylinders 13, each of which is supported on the bottom surface of the end of the first longitudinal frame 11 and the second longitudinal frame 12. In this way, the driving electric cylinder 4 can be used to quickly drive the load application simulation structure 4 to move up and down, quickly adjust the pressure on the pavement structure sample 5, and effectively improve the test efficiency.

[0047] Furthermore, if Figure 1 As shown, in this embodiment, the load application simulation structure 4 includes: a conveyor belt structure 14 and a plurality of simulated vehicle tires 15;

[0048] The conveyor belt structure 14 is installed at the inner center of the free ends of the four driving electric cylinders 13;

[0049] Each simulated vehicle tire 15 is arranged on the conveyor belt structure 14 at intervals, and can move back and forth with the conveyor belt. In this way, the conveyor belt on the conveyor belt structure 14 can drive multiple simulated vehicle tires 15 to move in a circular manner, so that a simulation test of multiple vehicles continuously passing by can be realized on the pavement structure sample 5, effectively simulating the stress conditions of each structural layer of the overall pavement under a real environment, and solving the problem that the stress conditions of the pavement structure during the vehicle driving on the pavement cannot be truly simulated due to the short distance of the loading test in the traditional solution.

[0050] Further, according to one embodiment of the present invention, the pavement structure multi-field variable speed loading mechanical response detection device of the present invention further includes: a temperature control structure (not shown in the figure) and a humidity control structure (not shown in the figure); the pavement structure sample 5 is also provided with a sensor for detecting its own temperature domain and humidity domain.

[0051] The temperature control structure and the humidity control structure cooperate with the pavement structure sample 5 respectively to control the temperature and humidity of the pavement structure sample 5. Then, the temperature and humidity on the pavement structure sample 5 are accurately detected by the sensor for detecting temperature and humidity in the pavement structure sample 5. In the present invention, the temperature control structure can be any device or instrument that can change the temperature of the pavement structure sample 5, as long as the temperature of the pavement structure sample 5 can be changed according to demand, and a simulation test can be performed at a specific temperature. The humidity control structure can be any device or instrument that can change the humidity of the pavement structure sample 5, as long as the humidity of the pavement structure sample 5 can be changed according to demand, and a simulation test can be performed at a specific humidity. With such a setting, the present invention can simulate the vehicle load pressure on the pavement surface layer under various temperatures and rain conditions, so that the present invention can realize the test detection of the stress and strain of the pavement structure when there is a temperature gradient in the depth direction of the overall pavement structure and water seepage on the pavement.

[0052] According to the above scheme of the present invention, before the start of the test and detection operation, ensure that a group of simulated vehicle tires 15 are pressed on the pavement structure sample 5, then adjust the driving electric cylinder 13, determine the tire loading pressure and tire pressure through the pressure sensor on the pavement structure sample 5, and then set the conveyor belt running speed and number of times, and output the stress and strain transformation of the pavement structure sample 5 under the corresponding tire pressure and tire rolling number through the stress and strain sensor buried in the pavement structure sample 5, orthogonally combine the structural layer thickness and modulus, select different pavement structure combination design schemes, and obtain the damage behavior of the pavement structure after the test. Comparative analysis is used to optimize the pavement structure design scheme, providing theoretical support for future pavement structure selection.

[0053] According to the above scheme of the present invention, the present invention is suitable for overall pavement structures with different thickness combinations. The setting of the conveyor belt effectively extends the loading distance, and the present invention can realize the functions of temperature and water control (humidity control), simulate the actual use of the overall pavement structure, analyze the test results (stress and strain conditions of the pavement), and optimize the pavement structure design scheme, with low test costs.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A multi-field variable speed loading mechanical response detection device for pavement structure, characterized in that: include: Support platform (1); A bracket (2) supported on the support platform (1); A load applying structure (3) is mounted on the support (2) and can reciprocate in the vertical direction; A load application simulation structure (4) is installed at the free end of the load application structure (3) and can reciprocate in the vertical direction under the drive of the load application structure (3); A pavement structure specimen (5) supported on the support platform (1) and located below the load application simulation structure (4); The load application simulation structure (4) is driven by the load application structure (3) to contact the pavement structure sample (5), and after contact, cyclic accelerated loading and pressure are applied to the pavement structure sample (5) from one end to the other end; The pavement structure sample (5) is provided with a pressure sensor for detecting the pressure of the load application simulation structure (4) and a stress strain sensor for detecting its own stress and strain conditions.

2. The multi-field variable speed loading mechanical response detection device for pavement structure according to claim 1 is characterized in that: The support (2) comprises: four height-adjustable legs (6) and a follower frame (7) supported on each of the legs (6); The follower frame (7) comprises: a plurality of mounting frames (8), a first horizontal frame (9), a second horizontal frame (10), a first vertical frame (11) and a second vertical frame (12); Each of the mounting frames (8) is fixedly mounted between two of the supporting legs (6); The first cross frame (9) and the second cross frame (10) are supported in parallel and oppositely on two opposite mounting frames (8); The first longitudinal frame (11) and the second longitudinal frame (12) are parallel to each other and vertically supported at intervals at the top center of the first transverse frame (9) and the second transverse frame (10).

3. The multi-field variable speed loading mechanical response detection device for pavement structure according to claim 2 is characterized in that: The load applying structure (3) comprises: four driving electric cylinders (13), each of which is supported on the bottom surface of the end of the first longitudinal frame (11) and the second longitudinal frame (12).

4. The multi-field variable speed loading mechanical response detection device for pavement structure according to claim 3 is characterized in that: The load application simulation structure (4) comprises: a conveyor belt structure (14) and a plurality of simulated vehicle tires (15); The conveyor belt structure (14) is installed at the inner center of the free ends of the four driving electric cylinders (13); The simulated vehicle tires (15) are arranged on the conveyor belt structure (14) at intervals from each other and can move back and forth along with the conveyor belt.

5. The multi-field variable speed loading mechanical response detection device for pavement structure according to any one of claims 1 to 4, characterized in that: Also includes: Temperature control structure and humidity control structure; The temperature control structure and the water control structure cooperate with the pavement structure sample (5) respectively to control the temperature and humidity of the pavement structure sample (5).

6. The multi-field variable speed loading mechanical response detection device for pavement structure according to any one of claims 1 to 4, characterized in that: The pavement structure sample (5) is also provided with sensors for detecting its own temperature domain and humidity domain.

Images