Multifunctional asphalt pavement skid resistance comprehensive testing device

Abstract

The multifunctional asphalt pavement anti-skid performance comprehensive testing device is used for solving the problem that the existing asphalt pavement anti-skid testing experiment is difficult to simulate different pavement environments and the testing condition is single. The base of the asphalt pavement anti-skid performance comprehensive testing device is embedded with an electric heating plate, a pouring groove is arranged on the upper surface of the base, two fixing frames are arranged on the left and right sides of the base respectively, the first sliding rail and the second sliding rail are arranged on the fixing frames in layers, two testing vehicle assemblies slide on the first sliding rail and the second sliding rail respectively, the first testing vehicle assembly comprises a first mobile trolley, a vehicle frame body, a first hydraulic machine and a two-wheeled vehicle body, and the second testing vehicle assembly comprises a second mobile trolley, a supporting frame, a motor, a rotating shaft, a rotating disc and a medium box. The asphalt pavement anti-skid performance comprehensive testing device can construct different environmental conditions, and the wheel rolling friction and sliding friction experiments are carried out through the two testing vehicle assemblies, so that the pavement anti-skid performance can be comprehensively evaluated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of asphalt pavement testing, and particularly relates to a comprehensive testing device for the skid resistance of asphalt pavement. BACKGROUND

[0002] During use, asphalt pavement is affected by natural factors such as light, oxidation, precipitation, and traffic load, which inevitably causes aging of the asphalt binder, and reduces the flexibility and adhesion of the asphalt, and further reduces the physical and mechanical properties of the asphalt mixture over time, which causes cracking and poor water stability of the asphalt pavement, and leads to diseases such as cracking and aggregate spalling of the asphalt pavement, and reduces the performance of the asphalt pavement.

[0003] Water damage to asphalt pavement is one of the most serious diseases of asphalt pavement on highways and has been widely studied. There are three main forms of water damage to asphalt mixture: 1. Changes in the "coarse aggregate-asphalt mortar-pore" system caused by long-term immersion of asphalt pavement in water; 2. Freeze-thaw damage to asphalt pavement caused by repeated freeze-thaw cycles of water in the pores of asphalt pavement; 3. Rainwater seeps into the pores and cracks of asphalt pavement, and under the action of vehicle load, dynamic water pressure is generated, which causes hydraulic damage to asphalt pavement.

[0004] Aging of asphalt causes changes in the performance of asphalt mixture, which has a certain impact on the stress and skid resistance of the pavement. The skid resistance of asphalt pavement is related to the friction coefficient between the pavement and the tire, and the state of the pavement and the use environment of the vehicle tire can affect the friction coefficient. For example, water accumulation on the wet pavement can cause "water lubrication", which can easily cause the vehicle to slide during driving. Snow or ice on the road in winter can cause the pavement texture to be damaged, the effective contact area between the tire and the asphalt pavement is greatly reduced, and the skid resistance coefficient is much lower than that on dry or wet ground, which can easily cause the vehicle to roll over, drift, and increase the braking distance. Therefore, it is necessary to develop an experimental testing device that can simulate different pavement environments and is used for the study of asphalt pavement aging and pavement performance. SUMMARY

[0005] The purpose of the present application is to solve the problem that the existing skid resistance testing experiment of asphalt pavement cannot simulate different pavement environments and the testing conditions are relatively single, and to provide a multifunctional comprehensive testing device for the skid resistance of asphalt pavement.

[0006] The multifunctional asphalt pavement anti-skid performance comprehensive testing device comprises a base, two fixing frames, a first sliding rail, a second sliding rail, a first test vehicle assembly, a second test vehicle assembly and a pouring groove, an electric heating plate is embedded in the base, the pouring groove is arranged on the upper surface of the base, a plurality of air outlets are arranged on the two sides of the base, the two fixing frames are arranged on the left and right sides of the base respectively, the first sliding rail and the second sliding rail are arranged on the two fixing frames in the height direction (layering), the first sliding rail extends from the right fixing frame to form a preparation area, the second sliding rail extends from the left fixing frame to form a polishing area, the first test vehicle assembly slides on the first sliding rail, and the second test vehicle assembly slides on the second sliding rail;

[0007] The first test vehicle assembly comprises a first movable trolley, a vehicle frame body, a first hydraulic machine and a double-wheel vehicle body, the first movable trolley slides in the first sliding rail, the vehicle frame body is arranged on the bottom surface of the first movable trolley, the first hydraulic machine is arranged between the vehicle frame body and the double-wheel vehicle body, wheel frames are arranged on the left and right sides of the double-wheel vehicle body, axles are installed on the wheel frames, wheels are sleeved on the axles, a torque sensor and an acceleration sensor are installed on the axles;

[0008] The second test vehicle assembly comprises a second movable trolley, a support frame, a first layer plate, a second layer plate, a second hydraulic machine, a motor, a motor frame, a torque sensor, a rotating shaft and a rotating disc, the second movable trolley slides in the second sliding rail, the support frame and the motor frame are fixed to the lower part of the second movable trolley, the first layer plate and the second layer plate are arranged on the support frame, a plurality of medium boxes are placed on the first layer plate, a spraying device is installed on the lower surface of the second layer plate, and the medium boxes and the spraying device are connected through pipelines; the bottom surface of the second movable trolley and the motor frame are connected through the second hydraulic machine, the motor is installed on the motor frame, a power output end of the motor is connected with the rotating shaft, the torque sensor is arranged on the rotating shaft, the rotating shaft vertically penetrates through the first layer plate and the second layer plate, the rotating shaft is connected with the rotating disc at the bottom, and the lower disc surface of the rotating disc is provided with a rubber sample.

[0009] The present application considers the influence of different environmental factors on the performance of the pavement, and designs the asphalt pavement performance comprehensive test device, the asphalt pavement anti-skid performance comprehensive test device mainly includes two slide rails, two test vehicle assemblies and various environment control devices, an ultraviolet lamp can be arranged on the top of the fixing frame, a heating plate is embedded in the base, and the aging of the asphalt pavement sample is accelerated through light and heat conditions. In actual application, the asphalt pavement is soaked in water for a long time, and the pavement experiences repeated freeze-thaw cycles in winter, so that the asphalt pavement is affected by water damage. A plurality of medium boxes are arranged in the second test vehicle assembly, and water, sand-water mixture, fine particles (broken stone, broken glass, etc.) and other media can be added in the medium boxes, the water, sand or other fine particles are scattered on the asphalt pavement during the sliding process of the second test vehicle assembly in the second slide rail, the water immersion environment of the pavement is simulated, and air outlets are arranged on the two sides of the base, when the air blowing device is combined with the pre-cooling device, the water on the pavement can be frozen into an ice layer, so that different water damage environments are constructed.

[0010] The first hydraulic machine controls the load, the uniform speed, the speed reduction and the braking mode of the first movable trolley, the driving mode is close to the actual wheel and pavement working condition, and the anti-skid performance of the asphalt pavement under different driving modes is reflected through the torque sensor and the acceleration sensor.

[0011] The asphalt pavement anti-skid performance comprehensive test device can construct different environmental conditions, such as ultraviolet light, high temperature, water immersion, icing, repeated vehicle load and the like, and can couple various environmental factors, the double-wheel vehicle is arranged in the first test vehicle assembly, the wheel rolling friction experiment is carried out, the rubber sample is arranged in the second test vehicle assembly, the fixed-point sliding friction experiment is carried out by the motor, and the anti-skid performance of different pavement conditions is evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure schematic view of the multifunctional asphalt pavement anti-skid performance comprehensive test device.

[0013] Figure 2 It is a structure schematic view of the second test vehicle assembly.

[0014] Figure 3 It is a structure schematic view of the double-wheel vehicle body in the first test vehicle assembly.

[0015] Figure 4 It is a structure schematic view of the air outlet on the two sides of the base. DETAILED DESCRIPTION

[0016] Specific embodiment one: the multifunctional asphalt pavement anti-skid performance comprehensive test device includes a base 1, two fixed frames 2, a first sliding rail 3, a second sliding rail 4, a first test vehicle assembly 6, a second test vehicle assembly 7 and a pouring groove 8, an electric heating plate 5 is embedded on the base 1, the pouring groove 8 is arranged on the upper surface of the base 1, a plurality of air outlets 13 are arranged on the two sides of the base 1, the two fixed frames 2 are arranged on the left and right sides of the base 1 respectively, the first sliding rail 3 and the second sliding rail 4 are arranged on the two fixed frames 2 along the height direction, the first sliding rail 3 extends out of the right fixed frame 2 to form a preparation area, the second sliding rail 4 extends out of the left fixed frame 2 to form a polishing area, the first test vehicle assembly 6 slides on the first sliding rail 3, and the second test vehicle assembly 7 slides on the second sliding rail 4.

[0017] The first test vehicle assembly 6 includes a first mobile trolley 6-1, a vehicle frame body 6-2, a first hydraulic machine 6-3 and a double-wheel vehicle body 6-4, the first mobile trolley 6-1 slides in the first sliding rail 3, the vehicle frame body 6-2 is arranged on the bottom surface of the first mobile trolley 6-1, the first hydraulic machine 6-3 is arranged between the vehicle frame body 6-2 and the double-wheel vehicle body 6-4, wheel frames are arranged on the left and right sides of the double-wheel vehicle body 6-4 respectively, an axle 6-5 is installed on the wheel frame, a wheel 6-6 is sleeved on the axle 6-5, a torque sensor 6-7 and an acceleration sensor 6-8 are installed on the axle 6-5.

[0018] The second test vehicle assembly 7 includes a second mobile trolley 7-1, a support frame 7-2, a first layer plate 7-3, a second layer plate 7-4, a second hydraulic machine 7-6, a motor 7-7, a motor frame 7-8, a torque sensor 7-9, a rotating shaft 7-10 and a rotating disc 7-11, the second mobile trolley 7-1 slides in the second sliding rail 4, the support frame 7-2 and the motor frame 7-8 are fixed to the lower part of the second mobile trolley 7-1, the first layer plate 7-3 and the second layer plate 7-4 are arranged on the support frame 7-2, a plurality of medium boxes 7-13 are placed on the first layer plate 7-3, a spraying device 7-5 is installed on the lower surface of the second layer plate 7-4, and the medium boxes 7-13 are connected with the spraying device 7-5 through pipelines 7-15; the bottom surface of the second mobile trolley 7-1 is connected with the motor frame 7-8 through the second hydraulic machine 7-6, the motor 7-7 is installed on the motor frame 7-8, the power output end of the motor 7-7 is connected with the rotating shaft 7-10, the torque sensor 7-9 is arranged on the rotating shaft 7-10, the rotating shaft 7-10 vertically penetrates through the first layer plate 7-3 and the second layer plate 7-4, the bottom of the rotating shaft 7-10 is connected with the rotating disc 7-11, and the lower disc surface of the rotating disc 7-11 is provided with a rubber sample 7-12.

[0019] The rotating disc and the rubber sample in the second test vehicle assembly in the embodiment can also be replaced by a wheel piece.

[0020] Specific implementation two: the difference between this embodiment and the specific implementation one is that the top of the two fixed frame 2 is provided with a top frame 11, and the ultraviolet lamp 12 is installed on the top frame 11.

[0021] The embodiment simulates the sunshine aging of the asphalt pavement through the ultraviolet lamp 12.

[0022] Specific implementation three: the difference between this embodiment and the specific implementation one or two is that the air outlet 13 is connected with the air blower.

[0023] Specific implementation four: the difference between this embodiment and one of the specific implementations one to three is that the cold air is sprayed through the air outlet 13, and the temperature of the cold air is controlled to be 0~-20℃.

[0024] The air outlet 13 of the embodiment is connected with the pre-cooling device, and the spraying of the cold air can make the sprayed water asphalt pavement freeze.

[0025] Specific implementation five: the difference between this embodiment and one of the specific implementations one to four is that the first group of travel switches 9-1 is arranged at both ends of the sliding rail section of the first sliding rail 3 between the two fixed frames 2.

[0026] The first group of travel switches 9-1 is arranged to make the first test vehicle assembly reciprocate.

[0027] Specific implementation six: the difference between this embodiment and one of the specific implementations one to five is that the second group of travel switches 9-2 is arranged at both ends of the sliding rail section of the second sliding rail 4 between the two fixed frames 2.

[0028] The second group of travel switches 9-2 is arranged to make the second test vehicle assembly reciprocate.

[0029] Specific implementation seven: the difference between this embodiment and one of the specific implementations one to six is that the magnetic attraction device 10 is arranged on the second sliding rail 4 in the polishing area.

[0030] The magnetic attraction device 10 is arranged to fix the position of the second test vehicle assembly.

[0031] Specific implementation eight: the difference between this embodiment and one of the specific implementations one to seven is that the conveying pump 7-14 is arranged on the pipeline 7-15 in the second test vehicle assembly 7.

[0032] Specific implementation nine: the difference between this embodiment and one of the specific implementations one to eight is that the bearing is arranged between the rotating shaft 7-10 and the first layer plate 7-3 and the second layer plate 7-4.

[0033] Specific implementation ten: the difference between this embodiment and the specific implementation nine is that the rotating shaft 7-10 is connected with the bearing by a key.

[0034] Embodiment: The multifunctional asphalt pavement skid resistance comprehensive testing device of the embodiment comprises a base 1, two fixing frames 2, a first sliding rail 3, a second sliding rail 4, a first test vehicle assembly 6, a second test vehicle assembly 7 and a pouring groove 8, an electric heating plate 5 is embedded on the base 1, the pouring groove 8 is arranged on the upper surface of the base 1, asphalt mixture is poured in the pouring groove 8, a plurality of air outlets 13 are arranged on the two sides of the base 1, the two fixing frames 2 are arranged on the left and right sides of the base 1 respectively, the first sliding rail 3 and the second sliding rail 4 are arranged on the two fixing frames 2 along the height direction, the first sliding rail 3 and the second sliding rail 4 are arranged horizontally and in parallel, the first sliding rail 3 extends from the right fixing frame 2 to form a preparation area, the second sliding rail 4 extends from the left fixing frame 2 to form a polishing area, the preparation area and the polishing area are both provided with a magnetic attraction device 10, the first test vehicle assembly 6 slides on the first sliding rail 3, and the second test vehicle assembly 7 slides on the second sliding rail 4;

[0035] The first test vehicle assembly 6 comprises a first mobile trolley 6-1, a vehicle frame body 6-2, a first hydraulic machine 6-3 and a double-wheel vehicle body 6-4, the first mobile trolley 6-1 slides in the first sliding rail 3, the vehicle frame body 6-2 is arranged on the bottom surface of the first mobile trolley 6-1, the first hydraulic machine 6-3 is arranged between the vehicle frame body 6-2 and the double-wheel vehicle body 6-4, wheel frames are arranged on the left and right sides of the double-wheel vehicle body 6-4 respectively, an axle 6-5 is installed on the wheel frame, a wheel 6-6 is sleeved on the axle 6-5, a torque sensor 6-7 and an acceleration sensor 6-8 are installed on the axle 6-5, and a first set of travel switches 9-1 are arranged at the two ends of the sliding rail section of the first sliding rail 3 between the two fixing frames 2;

[0036] The second test vehicle assembly 7 comprises a second mobile trolley 7-1, a support frame 7-2, a first layer plate 7-3, a second layer plate 7-4, a second hydraulic machine 7-6, a motor 7-7, a motor frame 7-8, a torque sensor 7-9, a rotating shaft 7-10 and a rotating disc 7-11, the second mobile trolley 7-1 slides in the second sliding rail 4, the support frame 7-2 and the motor frame 7-8 are fixed to the lower part of the second mobile trolley 7-1, the first layer plate 7-3 and the second layer plate 7-4 are arranged on the support frame 7-2, the first layer plate 7-3 is located above the second layer plate 7-4,

[0037] A plurality of medium boxes 7-13 are placed on the first layer plate 7-3, the spraying device 7-5 is installed on the lower surface of the second layer plate 7-4, the medium boxes 7-13 are connected with the spraying device 7-5 through the pipeline 7-15, the pipeline 7-15 is provided with a delivery pump 7-14 and a valve; the bottom surface of the second mobile trolley 7-1 is connected with the motor frame 7-8 through the second hydraulic machine 7-6, the motor 7-7 is installed on the motor frame 7-8, the power output end of the motor 7-7 is connected with the rotating shaft 7-10, the rotating shaft 7-10 is provided with the torsion sensor 7-9, the rotating shaft 7-10 vertically penetrates through the first layer plate 7-3 and the second layer plate 7-4, the rotating shaft 7-10 is provided with the bearing between the first layer plate 7-3 and the second layer plate 7-4, the rotating shaft 7-10 is key-connected with the bearing, the bottom of the rotating shaft 7-10 is connected with the rotating disc 7-11, the lower disc surface of the rotating disc 7-11 is provided with the rubber sample 7-12.

[0038] The top of the two fixed frames 2 is provided with the top frame 11, and the ultraviolet lamp 12 is installed on the top frame 11.

[0039] The multifunctional asphalt pavement anti-skid performance comprehensive testing device is applied to carry out aging test and anti-skid performance test under different pavement conditions.

[0040] Aging and rut damage test:

[0041] The ultraviolet lamp 12 is turned on, and the asphalt mixture sample is simulated to be aged under the action of ultraviolet light; the electric heating plate 5 is turned on, and the asphalt mixture sample is simulated to be aged under the action of high temperature; the first test vehicle assembly 6 is turned on, the load size is controlled through the first hydraulic machine 6-3, and the double-wheel vehicle body repeatedly travels between the two fixed frames 2, and the rut damage is formed due to the repeated action of the wheel load. The above test conditions can also be coupled.

[0042] Anti-skid performance test under different pavement conditions:

[0043] The first test vehicle assembly 6 is located in the preparation area, the second test vehicle assembly 7 is started, the second mobile trolley 7-1 slides on the second slide rail 4, the spraying device 7-5 sprays water on the pavement to simulate the rainwater pavement; the cold wind of the air outlet 13 is combined to make the water on the pavement freeze to simulate the ice and snow pavement, the first test vehicle assembly 6 is started, the double-wheel vehicle body 6-4 travels on the pavement, the torque and the speed are obtained through the torque sensor and the speed sensor, and then the pavement friction coefficient is obtained.

[0044] In the traveling process of the first test vehicle assembly 6, the first mobile trolley 6-1 is braked, at this time, the anti-collision rubber pads are additionally arranged at the two ends of the fixed frame 2, and the anti-skid performance of the pavement under the simulated braking condition is analyzed.

[0045] Polishing and abrasion test:

[0046] Start the magnetic attraction device 10 on the second sliding rail 4, fix the position of the second test vehicle assembly 7, control the load size through the second hydraulic machine 7-6, start the motor 7-7, drive the rubber sample 7-12 to rotate through the rotating shaft 7-10, collect torque information, and test the road surface anti-skid performance under sliding state.

[0047] Start the motor 7-7, control the load size through the second hydraulic machine 7-6, and slide the rubber sample 7-12 with the road surface. Record the wear time, measure the wear amount of the asphalt pavement by the sand laying method.

Claims

1. A multifunctional asphalt pavement skid resistance comprehensive testing device, characterized in that The multifunctional asphalt pavement anti-skid performance comprehensive test device comprises a base (1), two fixing frames (2), a first sliding rail (3), a second sliding rail (4), a first test car assembly (6), a second test car assembly (7) and a pouring groove (8), an electric heating plate (5) is embedded on the base (1), the pouring groove (8) is arranged on the upper surface of the base (1), a plurality of air blowing openings (13) are arranged on the two sides of the base (1), the two fixing frames (2) are arranged on the left and right sides of the base (1) respectively, the first sliding rail (3) and the second sliding rail (4) are arranged on the two fixing frames (2) in the height direction, the first sliding rail (3) extends out from the right fixing frame (2) to form a preparation area, the second sliding rail (4) extends out from the left fixing frame (2) to form a polishing area, a magnetic attraction device (10) is arranged on the second sliding rail (4) in the polishing area, the first test car assembly (6) slides on the first sliding rail (3), and the second test car assembly (7) slides on the second sliding rail (4); The first test car assembly (6) comprises a first movable trolley (6-1), a car frame body (6-2), a first hydraulic machine (6-3) and a double-wheel car body (6-4), the first movable trolley (6-1) slides in the first sliding rail (3), the car frame body (6-2) is arranged on the bottom surface of the first movable trolley (6-1), the first hydraulic machine (6-3) is arranged between the car frame body (6-2) and the double-wheel car body (6-4), wheel frames are arranged on the left and right sides of the double-wheel car body (6-4) respectively, an axle (6-5) is installed on the wheel frame, a wheel (6-6) is sleeved on the axle (6-5), a torque sensor (6-7) and an acceleration sensor (6-8) are installed on the axle (6-5); The second test vehicle assembly (7) comprises a second movable trolley (7-1), a support frame (7-2), a first layer plate (7-3), a second layer plate (7-4), a second hydraulic machine (7-6), a motor (7-7), a motor frame (7-8), a torque sensor (7-9), a rotating shaft (7-10) and a rotating disc (7-11). The second movable trolley (7-1) slides in the second slide rail (4). The support frame (7-2) and the motor frame (7-8) are fixed to the lower part of the second movable trolley (7-1). The first layer plate (7-3) and the second layer plate (7-4) are arranged on the support frame (7-2). A plurality of medium boxes (7-13) are placed on the first layer plate (7-3). A spraying device (7-5) is installed on the lower surface of the second layer plate (7-4). The medium boxes (7-13) are connected with the spraying device (7-5) through pipelines (7-15). The bottom surface of the second movable trolley (7-1) is connected with the motor frame (7-8) through the second hydraulic machine (7-6). The motor (7-7) is installed on the motor frame (7-8). The power output end of the motor (7-7) is connected with the rotating shaft (7-10). The torque sensor (7-9) is arranged on the rotating shaft (7-10). The rotating shaft (7-10) vertically penetrates the first layer plate (7-3) and the second layer plate (7-4). The rotating shaft (7-10) and the first layer plate (7-3) and the second layer plate (7-4) are all provided with bearings. The rotating shaft (7-10) is key-connected with the bearings. The bottom of the rotating shaft (7-10) is connected with the rotating disc (7-11). The lower disc surface of the rotating disc (7-11) is provided with rubber samples (7-12).

2. The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that A top frame (11) is arranged on the top of the two fixed frames (2). The ultraviolet lamp (12) is installed on the top frame (11).

3. The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that The air outlet (13) is connected with the air blower.

4. The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that Cold air is sprayed out through the air outlet (13). The temperature of the cold air is controlled to be 0-20℃.

5. The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that The first group of travel switches (9-1) are arranged at the two ends of the slide rail section of the first slide rail (3) between the two fixed frames (2). 6.The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that The second group of travel switches (9-2) are arranged at the two ends of the slide rail section of the second slide rail (4) between the two fixed frames (2).

7. The multifunctional asphalt pavement skid resistance comprehensive testing device according to claim 1, characterized in that The pipeline (7-15) in the second test vehicle assembly (7) is provided with a delivery pump (7-14).

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