CN218765377U - Dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment - Google Patents
Dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment Download PDFInfo
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- CN218765377U CN218765377U CN202123102479.4U CN202123102479U CN218765377U CN 218765377 U CN218765377 U CN 218765377U CN 202123102479 U CN202123102479 U CN 202123102479U CN 218765377 U CN218765377 U CN 218765377U
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Abstract
The utility model discloses a different longitudinal gradient highway section structure dynamic response testing arrangement of big difference in temperature environment. The device comprises a temperature difference adjusting unit, a longitudinal slope control unit, a test piece unit and a load applying unit, wherein the temperature difference adjusting unit comprises a heater, a temperature controller, a refrigerator, a heat insulation layer, a temperature display, an inner wall, an outer wall and a heat conducting medium; the longitudinal slope control unit comprises a supporting plate, a longitudinal slope controller, a test mold limiting plate, a fixing rod, a clamp and a limiter; the test piece unit comprises a test mould, different pavement structure layer materials, a strain gauge, a temperature sensor and acquisition equipment; the load applying unit comprises a support, a sliding rod, a connecting rod, a speed controller, a balance weight and a tire. The device has the characteristics of simple structure, large temperature difference change range, accurate longitudinal slope, speed and load control, and high-efficiency and convenient data acquisition.
Description
Technical Field
The utility model relates to a road engineering technology field, concretely relates to different longitudinal gradient highway section structure dynamic response testing arrangement of big difference in temperature environment.
Background
The pavement is used as a main carrier of load action, and the performance of the pavement is greatly influenced by temperature and load. Particularly, in different longitudinal slope sections in large temperature difference areas, the special stress characteristics of the road surface is the main reason for causing road surface slippage diseases and track diseases, so that the overall performance of a road surface structure is reduced, and great hidden dangers are brought to driving safety. Therefore, the dynamic response testing device for the pavement structures of different longitudinal slopes under the large temperature difference environment is researched and used for analyzing the mechanical response of the pavement structures under different temperature difference environments and axle load conditions to provide data support for road design.
Disclosure of Invention
To the problem that exists in the middle of the above-mentioned background art, the utility model aims to provide a can effectively measure different longitudinal gradient highway sections under different temperature difference environment and the load condition road surface structure dynamic response's device to for different longitudinal gradient highway sections bituminous mixture mix design and road maintenance provide data support, and then reduce the emergence of longitudinal gradient highway section road surface disease under the big temperature difference environment, guarantee driving safety.
In order to achieve the purpose, the dynamic response testing device for the large temperature difference environment different longitudinal slope section structure comprises a testing box body and a test piece in the testing box body, wherein the testing box body is provided with a temperature difference adjusting unit, a longitudinal slope control unit and a load applying unit, and the test piece is arranged on the longitudinal slope control unit; the temperature difference adjusting unit is arranged on the wall of the box body of the test box body; the longitudinal slope control unit and the load applying unit are arranged inside the test box body; the load applying unit is arranged above the longitudinal slope control unit;
the temperature difference adjusting unit comprises a heat insulation layer, an outer wall, a heat conducting medium and an inner wall which are arranged from outside to inside at one time, wherein a temperature controller is arranged between the outer wall and the heat conducting medium and is respectively connected with a heater and a refrigerator; the heat conducting medium is connected with a temperature display;
the longitudinal slope control unit comprises a support plate and a test mold limiting plate, the support plate and the test mold limiting plate are rectangular plates, and a longitudinal slope adjusting member is arranged between the support plate and the test mold limiting plate; the longitudinal slope adjusting member comprises a first adjusting rod, a second adjusting rod, a third adjusting rod and a fourth adjusting rod; the first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are longitudinally arranged; a test mold limiting rod is arranged on the test mold limiting plate; the test mold limiting rod comprises a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod; the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are arranged at four corners of the test mold limiting plate; the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are all provided with a clamp and a limiter; the clamp, the limiter and the test mold limiting rod are matched and fastened;
the load applying unit mainly comprises a bracket and a sliding rod; the support comprises a first upright post and a second upright post, the first upright post and the second upright post are connected through a sliding rod to form a gantry frame, a movable suspension buckle is mounted on the sliding rod and connected with a connecting rod, and a balance weight is arranged between the movable suspension buckle and the connecting rod; and the tail end of the connecting rod is provided with a tire.
The first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are arranged in parallel.
The movable suspension buckle is also provided with a variable speed motor.
And a connecting screw rod is arranged between the movable suspension buckle and the balance weight, the balance weight is welded with the connecting screw rod, and the connecting screw rod is matched with the movable suspension buckle to adjust the up-and-down movement of the balance weight.
And the upper layer mold, the middle layer mold, the lower layer mold, the base layer mold and the bottom layer mold are filled with actual filling materials of the road surface to be tested.
The test piece comprises an upper layer die, a middle layer die, a lower layer die, a base layer die and a bottom layer die from top to bottom in sequence; and strain gauges and temperature sensors are arranged among the upper layer die, the middle layer die, the lower layer die, the base layer die and the bottom layer die.
The strain gauge is a grating strain gauge; the grating strain gauge has the advantages of high sensitivity, high and low temperature resistance, corrosion resistance, electromagnetic interference resistance and long service life.
The test piece selects a corresponding layer mold according to the actual structural size of the road surface, corresponding materials are filled in the layer mold for layering, compaction and molding, and the stress meter and the temperature sensor which are embedded between layers are connected with an acquisition device to acquire corresponding data.
The heat-conducting medium is heat-conducting silicone grease, the longitudinal slope control unit is an electric jack, and the tire is a track testing machine tire.
Different longitudinal gradient highway section structure dynamic response testing arrangement of big difference in temperature environment, its beneficial effect lies in: completing the field large-temperature-difference dynamic response test on different longitudinal slope sections through an indoor test; the device has the characteristics of simple structure, controllable temperature difference change range, large change space, accurate longitudinal slope, speed and load control, and high-efficiency and convenient data acquisition.
Drawings
FIG. 1 is a schematic view of a temperature differential accommodating unit;
FIG. 2 is a schematic view of a longitudinal slope control unit;
FIG. 3 is a schematic view of a load applying unit;
FIG. 4 is a schematic view of a test piece;
FIG. 5 is a schematic view of the apparatus;
in the figure: 1-heat insulation layer, 2-outer wall, 3-heat conducting medium, 4-inner wall, 5-refrigerator, 6-temperature controller, 7-heater, 8-temperature display, 9-clamp, 10-limiter, 11-test limiting rod, 12-test limiting plate, 13-longitudinal slope adjusting member, 14-support plate, 15-support, 16-slide bar, 17-movable suspension buckle, 18-counterweight, 19-connecting rod, 20-tire, 21-upper layer mold, 22-middle layer mold, 23-lower layer mold, 24-base layer mold, 25-bottom layer mold, 26-strain gauge, 27-temperature sensor, 28-data acquisition instrument, 29-control center and 30-display.
Detailed Description
Example 1
As shown in fig. 1-5, the dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment of the utility model comprises a testing box body and a test piece in the testing box body, wherein the testing box body is provided with a temperature difference adjusting unit, a longitudinal slope control unit and a load applying unit, and the test piece is arranged on the longitudinal slope control unit; the temperature difference adjusting unit is arranged on the wall of the box body of the test box body; the longitudinal slope control unit and the load applying unit are arranged inside the test box body; the load applying unit is arranged above the longitudinal slope control unit;
the temperature difference adjusting unit comprises a heat insulation layer 1, an outer wall 2, a heat conducting medium 3 and an inner wall 4 which are arranged from outside to inside at one time, wherein a temperature controller 6 is arranged between the outer wall 2 and the heat conducting medium 3, and the temperature controller 6 is respectively connected with a heater 7 and a refrigerator 5; the heat-conducting medium 3 is connected with a temperature display 8;
the longitudinal slope control unit comprises a support plate 14 and a test mold limiting plate 12, the support plate 14 and the test mold limiting plate 12 are rectangular plates, and a longitudinal slope adjusting member 13 is arranged between the support plate 14 and the test mold limiting plate 12; the longitudinal slope adjusting member 13 includes a first adjusting lever, a second adjusting lever, a third adjusting lever and a fourth adjusting lever; the first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are longitudinally arranged; the test mold limiting plate 12 is provided with a test mold limiting rod 11; the test mold limiting rod 11 comprises a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod; the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are arranged at four corners of the test mold limiting plate 12; the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are respectively provided with a clamp 9 and a limiter 10; the clamp 9 and the limiter 10 are matched and fastened with the test mold limiting rod 11;
the load applying unit mainly comprises a bracket 15 and a sliding rod 16; the support 15 comprises a first upright post and a second upright post, the first upright post and the second upright post are connected through a sliding rod 16 to form a gantry frame, a movable suspension buckle 17 is mounted on the sliding rod 16, the movable suspension buckle 17 is connected with a connecting rod 19, and a counterweight 18 is arranged between the movable suspension buckle 17 and the connecting rod 19; the end of the link 19 is fitted with a tyre 20.
The first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are arranged in parallel.
The movable hanging buckle 17 is also provided with a variable speed motor.
And a connecting screw rod is arranged between the movable suspension buckle 17 and the counterweight 18, the counterweight 18 is welded with the connecting screw rod, and the connecting screw rod is matched with the movable suspension buckle 17 to adjust the up-and-down movement of the counterweight 18.
And the upper layer mold 21, the middle layer mold 22, the lower layer mold 23, the base layer mold 24 and the bottom layer mold 25 are filled with actual filling materials of the road surface to be tested.
The test piece comprises an upper layer die 21, a middle layer die 22, a lower layer die 23, a base layer die 24 and a bottom layer die 25 from top to bottom in sequence; and strain gauges 26 and temperature sensors 27 are arranged among the upper layer die 21, the middle layer die 22, the lower layer die 23, the base layer die 24 and the bottom layer die 25.
The strain gauges 26 are grating strain gauges; the grating strain gauge has the advantages of high sensitivity, high and low temperature resistance, corrosion resistance, electromagnetic interference resistance and long service life.
The test piece selects a corresponding layer mold according to the actual structural size of the road surface, corresponding materials are filled in the layer mold for layering, compaction and molding, and the stress meter and the temperature sensor which are embedded between layers are connected with an acquisition device to acquire corresponding data.
The heat-conducting medium 3 is heat-conducting silicone grease, the longitudinal slope control unit is an electric jack, and the tire is a rut testing machine tire.
In the embodiment, the heat-conducting medium adopts heat-conducting silicone grease, so that the heat-conducting medium has high heat conductivity, excellent heat conductivity, good electrical insulation, wider service temperature (-50 ℃ -230 ℃), stable performance and long service life, and is shown in figure 1; refrigerator 5, temperature controller 6, heater 7 respectively set up two at least, and correspond the setting in the test box, set up top and bottom in the test box respectively.
The working process of the device is as follows:
firstly, the device is arranged in a laboratory, temperature difference data are transmitted to a temperature controller 6 through a control center 29 according to the temperature difference condition of an actual pavement structure, and the temperature controller 6 dynamically adjusts the top and bottom temperatures in the device through adjusting a heater 7 and a refrigerator 5, so that the temperature of a temperature difference adjusting unit reaches the temperature difference of the actual pavement structure;
a longitudinal slope adjusting member 13 in the longitudinal slope control unit is an electric jack, and simulates the gradient of a road surface by adjusting the heights of a first adjusting rod, a second adjusting rod, a third adjusting rod and a fourth adjusting rod;
a test mold limiting plate 12 is installed above the longitudinal slope control unit, a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod are respectively installed on four corners of the test mold limiting plate 12, limiting devices 10 are installed on the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod, a clamp 9 is controlled through the limiting devices 10 to fix a test piece, and a groove is formed in the test piece and is embedded with the clamp 9, as shown in fig. 2, 4 and 5;
then, manufacturing a test piece according to the actual structure of the road surface; each structural layer of the test piece is formed in a layered mode according to the actual pavement layer thickness and the design matching ratio, a corresponding test mold is selected according to actual needs, after one layer of pavement structure is formed, a stress meter and a temperature sensor are buried in the center of the surface of the layer, and then the next layer of pavement structure material is filled into the test mold and compacted;
and thirdly, placing the test piece unit in a test mould limiting plate 12, screwing a limiter 10 at a proper position according to the position of the height adjusting clamp 9 of the test piece, fixing the test mould, and then adjusting the slope of the longitudinal slope by adjusting the relative height between longitudinal slope controllers through a control center 29.
Finally, the variable speed motor on the movable suspension buckle 17 is connected with the control center 29, the movement speed of the tire 20 is changed through the control center 29 according to actual requirements, the movable suspension buckle 17 moves through the sliding rod 16, and then the upper position and the lower position of the tire can be changed through adjusting the connecting screw rod according to the maximum axle load requirement of the road surface structure design, so that the pressure of the tire on the test piece reaches the design requirement. After all the test equipment is debugged, the test equipment is started, load application is carried out according to actual engineering, the temperature difference adjusting unit is tested after reaching the actual temperature, experimental data are collected through the data collecting instrument 28, the data collecting instrument 28 is connected with the data processing module, and the data processing module expresses the processed experimental data on the display 30 connected with the data processing module.
Claims (7)
1. The utility model provides a different longitudinal gradient highway section structure dynamic response testing arrangement of big difference in temperature environment, includes the test piece in test box and the test box, its characterized in that: the test box body is provided with a temperature difference adjusting unit, a longitudinal slope control unit and a load applying unit, and the test piece is arranged on the longitudinal slope control unit; the temperature difference adjusting unit is arranged on the wall of the box body of the test box body; the longitudinal slope control unit and the load applying unit are arranged inside the test box body; the load applying unit is arranged above the longitudinal slope control unit;
the temperature difference adjusting unit comprises a heat insulation layer (1), an outer wall (2), a heat conducting medium (3) and an inner wall (4) which are arranged from outside to inside at one time, a temperature controller (6) is arranged between the outer wall (2) and the heat conducting medium (3), and the temperature controller (6) is respectively connected with a heater (7) and a refrigerator (5); the heat-conducting medium (3) is connected with a temperature display (8);
the longitudinal slope control unit comprises a supporting plate (14) and a test mold limiting plate (12), the supporting plate (14) and the test mold limiting plate (12) are rectangular plates, and a longitudinal slope adjusting member (13) is arranged between the supporting plate (14) and the test mold limiting plate (12); the longitudinal slope adjusting member (13) comprises a first adjusting rod, a second adjusting rod, a third adjusting rod and a fourth adjusting rod; the first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are longitudinally arranged; a test mold limiting rod (11) is arranged on the test mold limiting plate (12); the test mold limiting rod (11) comprises a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod; the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are arranged at four corners of the test mold limiting plate (12); the first limiting rod, the second limiting rod, the third limiting rod and the fourth limiting rod are all provided with a clamp (9) and a limiter (10); the clamp (9) and the limiter (10) are matched and fastened with the test mold limiting rod (11);
the load applying unit mainly comprises a bracket (15) and a sliding rod (16); the support (15) comprises a first upright post and a second upright post, the first upright post and the second upright post are connected through a sliding rod (16) to form a gantry frame, a movable suspension buckle (17) is mounted on the sliding rod (16), the movable suspension buckle (17) is connected with a connecting rod (19), and a counterweight (18) is arranged between the movable suspension buckle (17) and the connecting rod (19); and a tire (20) is arranged at the tail end of the connecting rod (19).
2. The large-temperature-difference environment different longitudinal slope section structure dynamic response testing device as claimed in claim 1, characterized in that: the first adjusting rod, the second adjusting rod, the third adjusting rod and the fourth adjusting rod are arranged in parallel.
3. The dynamic response testing device for the large temperature difference environment different longitudinal slope section structure as claimed in claim 2, wherein: the movable hanging buckle (17) is also provided with a variable speed motor.
4. The device for testing the dynamic response of the structure of the section of the longitudinal slope in the large temperature difference environment as claimed in claim 3, characterized in that: a connecting screw rod is arranged between the movable suspension buckle (17) and the counterweight (18), the counterweight (18) is welded with the connecting screw rod, and the connecting screw rod is matched with the movable suspension buckle (17) to adjust the up-down movement of the counterweight (18).
5. The device for testing the dynamic response of the structure of the section of the longitudinal slope in the large temperature difference environment as claimed in claim 4, characterized in that: the test piece comprises an upper layer die (21), a middle layer die (22), a lower layer die (23), a base layer die (24) and a bottom layer die (25) from top to bottom in sequence; and strain gauges (26) and temperature sensors (27) are arranged among the upper layer die (21), the middle layer die (22), the lower layer die (23), the base layer die (24) and the bottom layer die (25).
6. The device for testing the dynamic response of the structure of the section of the longitudinal slope in the large temperature difference environment as claimed in claim 5, wherein: and the upper layer mold (21), the middle layer mold (22), the lower layer mold (23), the base layer mold (24) and the bottom layer mold (25) are filled with actual filling materials of the road surface to be tested.
7. The device for testing the dynamic response of the structure of the section of the longitudinal slope in the large temperature difference environment as claimed in claim 6, wherein: the strain gauges (26) are grating strain gauges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102479.4U CN218765377U (en) | 2021-12-07 | 2021-12-07 | Dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123102479.4U CN218765377U (en) | 2021-12-07 | 2021-12-07 | Dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment |
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| Publication Number | Publication Date |
|---|---|
| CN218765377U true CN218765377U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123102479.4U Active CN218765377U (en) | 2021-12-07 | 2021-12-07 | Dynamic response testing device for different longitudinal slope road section structures in large temperature difference environment |
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| CN (1) | CN218765377U (en) |
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2021
- 2021-12-07 CN CN202123102479.4U patent/CN218765377U/en active Active
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