Asphalt pavement permeability testing device

Abstract

The invention discloses an asphalt pavement permeability testing device, and belongs to the technical field of asphalt pavement permeability test.The testing device comprises a measuring cylinder used for measuring and detecting water consumption of asphalt pavement permeability, and a detection barrel is fixedly installed below the measuring cylinder through a valve pipe; a sealing assembly is fixed at the bottom of the detection barrel, a lifting ring is slidably mounted outside the detection barrel, the lifting ring is pressed above the sealing assembly, a plurality of pressing blocks are fixed outside the detection barrel in the direction of the central axis at equal angles, and the pressing blocks are pressed above the lifting ring; a heat conduction barrel for balancing and detecting the ground temperature of water and asphalt is movably arranged in the detection barrel in the axis direction, and a horizontal intelligent control valve and a vertical intelligent control valve are mounted on the heat conduction barrel; the testing device can dynamically adjust the fitting degree of the sealing assembly and the asphalt pavement at the initial stage, the middle stage and the later stage of testing, detection water leakage is avoided, and the reliability of testing data is improved.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement permeability testing technology, specifically to an asphalt pavement permeability testing device. Background Technology

[0002] The permeability coefficient is directly related to the gradation design and compaction degree of asphalt pavement mixtures. The permeability performance test can determine whether the gradation of the mixture meets the requirements and whether the on-site compaction is in place. For example, insufficient compaction of asphalt pavement will lead to a larger void ratio and faster water seepage. During the test, the bottom of the device is attached to the asphalt pavement, and test water is injected into the small space formed by the device and the asphalt pavement. The seepage time is recorded, the permeability coefficient is calculated, and finally the permeability performance is determined according to the pavement grade.

[0003] For example, patent CN118583750B discloses a road pavement asphalt permeability testing device, including a support ring and a testing mechanism. The testing mechanism includes a measuring cylinder, with two sets of symmetrically fixed rods rotatably connected to the outer wall of the measuring cylinder near the bottom. The measuring cylinder is mounted on the inner wall of the support ring via the two sets of fixed rods. Fasteners are installed at the connection between the measuring cylinder and the two sets of fixed rods, and a valve is fixedly installed inside the measuring cylinder near the bottom. Through the setting of the testing mechanism, when testing the permeability of a sloping road surface, the opening and closing of the fasteners and the counterweight on the measuring cylinder can be used to make the measuring cylinder perpendicular to the earth's surface, thereby ensuring the accuracy of reading the water level in the measuring cylinder. At the same time, it avoids the water pressure in the measuring cylinder from having a component along the slope direction due to gravity, so that the water pressure in the measuring cylinder can act entirely on the slope surface at the bottom of the measuring cylinder, ensuring the accuracy of the test data.

[0004] For example, patent CN112611697B discloses a permeability attenuation model test system and method for permeable asphalt pavement, including a sample tank and a loading device set above the sample tank. The loading device includes columns on both sides of the sample tank, with the top of the columns fixed to a top plate. Lifting mechanisms are provided at both ends of the top plate, and the lifting mechanisms are connected to lifting platforms. A guide rail is connected between the lifting platforms, and wheels are slidably connected to the guide rail. The wheels are connected to a drive mechanism for driving them to move along the axis of the guide rail. The system also includes a first camera on the top plate and a second camera on one side of the sample tank. A first laser scanning element is provided on the other side of the sample tank. A water spray pipe is provided below the top plate and is connected to a water supply device. This system can study the permeability attenuation of permeable asphalt pavement under the combined effects of traffic load, sediment, and rainwater.

[0005] For example, patent CN110763608B discloses a testing device and method for the permeability of asphalt mixture Marshall specimens, including a water storage tank, an air compressor, a specimen placement cylinder, and an adjustable support; the top of the water storage tank has a water inlet and an air inlet; wherein, the water inlet is connected to a water source, and the air inlet is connected to the compressed gas outlet of the air compressor; the water storage tank is placed on top of the specimen placement cylinder, and the water storage tank and the specimen placement cylinder are sealed together, with a water flow channel between the water storage tank and the specimen placement cylinder, and a first drain outlet is opened at the bottom of the water storage tank; a first level gauge is provided on the side of the water storage tank, and a second level gauge is provided on the side of the specimen placement cylinder; a partition is provided in the middle of the specimen placement cylinder, and a water flow channel is provided at the partition; the specimen placement cylinder... A second drainage outlet is opened at the bottom; it can be used to simulate the permeability of the road surface under dynamic water pressure, and can control the magnitude of the hydraulic gradient, enabling more accurate detection of the permeability of various road surfaces with different slopes; however, the existing testing equipment has significant deficiencies in its fit and seal with the asphalt road surface. In the initial stage of water injection, the test water will seep out from the gap between the equipment and the road surface under water pressure, directly interfering with the judgment of the true permeability performance of the road surface. In addition, during the test, as the test water continues to seep into the road surface, the water level inside the equipment will gradually decrease, which will cause dynamic fluctuations in the internal water pressure, interfering with the sealing stability between the equipment and the road surface, easily exacerbating the leakage of water, and ultimately leading to distorted test data that cannot accurately reflect the permeability of the road surface.

[0006] To address the aforementioned issues, there is an urgent need for innovative designs based on existing asphalt pavement permeability testing devices. Summary of the Invention

[0007] The purpose of this invention is to provide an asphalt pavement permeability testing device to solve the problem mentioned in the background art that some testing devices have obvious deficiencies in their fit and sealing with the asphalt pavement, and are easily affected by fluctuations in the internal water pressure of the testing device during the initial water injection and testing process, resulting in water leakage and affecting the accuracy of the test data.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an asphalt pavement permeability testing device, comprising a measuring cylinder for measuring the amount of water used to test the permeability of asphalt pavement, a test bucket fixedly installed below the measuring cylinder via a valve pipe, a trolley provided outside the measuring cylinder and the test bucket, a threaded rod rotatably mounted on the trolley, a support frame threaded onto the threaded rod, the support frame slidably mounted on the trolley, and the support frame fixedly mounted outside the measuring cylinder; a sealing assembly fixed at the bottom of the test bucket, a lifting ring slidably mounted outside the test bucket, the lifting ring pressing against the sealing assembly, and multiple pressure blocks fixed at equal angles along the central axis of the test bucket, the pressure blocks pressing against the lifting ring; a heat-conducting tank movably arranged inside the test bucket along the axial direction to balance the temperature of the test water and the asphalt pavement, a horizontal intelligent control valve and a vertical intelligent control valve installed on the heat-conducting tank; and a power transmission mechanism provided on the test bucket for pressing the sealing assembly by gravity of the test water loaded in the heat-conducting tank.

[0009] Preferably, the power transmission mechanism includes a guide column fixed at an equal angle to the outside of the detection barrel along the axial direction, a lifting bracket slidably connected through the guide column, and the lower end face of the lifting bracket pressing against the upper surface of the lifting ring.

[0010] Preferably, the upper surface of the testing barrel is provided with multiple exhaust holes at equal angles along the axial direction, the lifting bracket is disposed through the exhaust holes, and the part of the lifting bracket located inside the testing barrel is fixedly connected to the heat-conducting barrel through a fixed bracket.

[0011] Preferably, a cylindrical rod is fixedly connected to the upper surface of the testing barrel, a lifting bracket is slidably sleeved on the outside of the cylindrical rod, and a disc is fixedly installed on the cylindrical rod, with the disc fitting against the upper part of the lifting bracket; a buffer spring is elastically connected between the lifting bracket and the testing barrel.

[0012] Preferably, a hollow column is fixedly installed at the bottom of the heat-conducting barrel along the axial direction, and a positioning rod is slidably connected through the hollow column and the heat-conducting barrel; multiple crossbars are fixed at equal angles along the axial direction at the bottom of the positioning rod, and a liquid level sensor is fixedly installed at the bottom of the crossbars; a floating airbag is fixedly installed between the multiple crossbars.

[0013] Preferably, the sealing assembly includes a pneumatic sealing ring fixedly installed below the test barrel, and an embedded groove is provided on the side of the pneumatic sealing ring near the test barrel, in which a water pressure sealing ring is fitted.

[0014] Preferably, the testing barrel is equipped with a water flow transmission mechanism that increases the pressure of the water pressure sealing ring by using the liquid stored inside the heat-conducting barrel.

[0015] Preferably, the water flow transmission mechanism includes two sets of drain pipes that are connected through to the side of the heat conduction tank, and two sets of water supply pipes that are connected through to the side of the water pressure sealing ring near the test tank. The water supply pipes are fixedly connected through to the test tank, and the water supply pipes are telescopically connected below the drain pipes.

[0016] Preferably, a counterweight is fixedly installed on the outside of the positioning rod, and the counterweight moves down and presses against the bottom surface of the heat-conducting barrel.

[0017] Preferably, a push rod is slidably connected in the drain pipe along the axial direction, and grooves are opened on the upper and lower surfaces of the push rod; a transmission rod is rotatably connected to the push rod, and the other end of the transmission rod is rotatably connected to the positioning rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the asphalt pavement permeability testing device first injects test water into the heat-conducting barrel, lets it stand for a period of time to balance the water temperature between the ground and the inside of the heat-conducting barrel, and then controls the test water inside the heat-conducting barrel to enter the test barrel through a horizontal intelligent control valve. The permeability of the asphalt pavement is judged based on the time it takes for the test water inside the test barrel to penetrate.

[0019] The testing barrel is equipped with a power transmission mechanism that uses the gravity of the test water loaded in the heat-conducting barrel to press the sealing component. The horizontal intelligent control valve on the testing barrel is at a certain height from the bottom of the heat-conducting barrel. When the water drains into the testing barrel, some water will remain inside the heat-conducting barrel. The gravity of the test water can drive the lifting bracket to move downward, so that the lifting bracket presses against the lifting ring. This makes the lifting ring evenly press against the sealing component, ensuring that the sealing component can be stably attached to the asphalt pavement during the initial test, preventing the test water from seeping out and reducing the impact of water pressure when the test water initially enters the testing barrel.

[0020] Furthermore, the lifting bracket is elastically slidably mounted on the outside of the cylindrical rod by a buffer spring. The buffer spring can gradually buffer the downward force of the lifting bracket, keeping the lifting bracket able to stably apply pressure to the lifting ring and sealing assembly, and further keeping the sealing assembly stably attached to the asphalt pavement.

[0021] The sealing assembly includes an air pressure sealing ring and a water pressure sealing ring. The water pressure sealing ring is connected to the inside of the heat transfer tank through a drain pipe and a water supply pipe. During the permeation test, the water flow inside the heat transfer tank can be controlled to enter the interior of the water pressure sealing ring, which can increase the pressure inside the water pressure sealing ring. This increases the squeezing force of the water pressure sealing ring on the air pressure sealing ring, further pressing the air pressure sealing ring tightly against the ground and reducing water pressure interference caused by changes in the water level inside the detection tank during the permeation test.

[0022] The testing tank is equipped with a water flow transmission mechanism that increases the pressure of the water pressure sealing ring by utilizing the liquid stored inside the heat-conducting tank. When the water level inside the testing tank decreases, the floating airbag drives the crossbar and positioning rod to move downwards. Combined with the counterweight, this causes the positioning rod to move downwards stably. The counterweight moves downwards and presses against the inside of the heat-conducting tank, increasing the pressure inside the tank and enhancing the pressure of the lifting support on the lifting ring and sealing components. Furthermore, the downward movement of the positioning rod drives the transmission rod to rotate. The rotating transmission rod pushes the push rod to move in the drain pipe. After the cylindrical end of the push rod enters the drain pipe, it pushes the liquid inside the drain pipe into the water pressure sealing ring, thereby increasing the pressure of the water pressure sealing ring. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the trolley structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the measuring cylinder structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the detection barrel structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the lifting support structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the heat-conducting barrel structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the buffer spring structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the pneumatic sealing ring and the hydraulic sealing ring of the present invention.

[0030] Figure 8 This is a schematic diagram of the floating airbag structure of the present invention.

[0031] Figure 9 This is a schematic diagram of the positioning rod structure of the present invention.

[0032] Figure 10 This is a schematic diagram of the counterweight structure of the present invention.

[0033] Figure 11 This is a schematic diagram of the crossbar structure of the present invention.

[0034] Figure 12 This is a schematic diagram of the push rod structure of the present invention.

[0035] In the diagram: 1. Measuring cylinder; 2. Valve pipe; 3. Testing barrel; 4. Trolley; 5. Threaded rod; 6. Support frame; 7. Sealing assembly; 71. Pneumatic sealing ring; 72. Embedded groove; 73. Hydraulic sealing ring; 8. Lifting ring; 9. Pressure block; 10. Vent hole; 11. Guide column; 12. Lifting bracket; 121. Cylindrical rod; 122. Disc; 123. Buffer spring; 13. Fixed bracket; 14. Heat-conducting barrel; 15. Horizontal intelligent control valve; 16. Vertical intelligent control valve; 17. Hollow column; 18. Positioning rod; 19. Crossbar; 20. Liquid level sensor; 21. Floating airbag; 22. Drain pipe; 23. Water supply pipe; 24. Counterweight; 25. Push rod; 26. Groove; 27. Transmission rod. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1 - Figure 5 The present invention provides the following technical solution: an asphalt pavement permeability testing device, comprising a measuring cylinder 1 for measuring the amount of water used to test the permeability of asphalt pavement, a test barrel 3 fixedly installed below the measuring cylinder 1 via a valve pipe 2, a trolley 4 provided outside the measuring cylinder 1 and the test barrel 3, a threaded rod 5 rotatably installed on the trolley 4, a support frame 6 threadedly fitted on the threaded rod 5, the support frame 6 slidably installed on the trolley 4, and the support frame 6 fixedly installed outside the measuring cylinder 1; a sealing component 7 fixed at the bottom of the test barrel 3, a lifting ring 8 slidably installed outside the test barrel 3, the lifting ring 8 pressing against the sealing component 7, and multiple pressure blocks 9 fixed at equal angles along the central axis direction outside the test barrel 3, the pressure blocks 9 pressing against the lifting ring 8; a heat-conducting barrel 14 movably arranged inside the test barrel 3 along the axial direction to balance the temperature of the test water and the asphalt pavement, a horizontal intelligent control valve 15 and a vertical intelligent control valve 16 installed on the heat-conducting barrel 14; and a power transmission mechanism provided on the test barrel 3 for pressing the sealing component 7 by gravity of the test water loaded in the heat-conducting barrel 14.

[0038] Please see Figure 3 - Figure 6The power transmission mechanism includes a guide post 11 fixed at equal angles along the axial direction to the outside of the test barrel 3. A lifting bracket 12 is slidably connected through the guide post 11, and the lower end face of the lifting bracket 12 is pressed against the upper surface of the lifting ring 8. Multiple vent holes 10 are formed at equal angles along the axial direction on the upper surface of the test barrel 3. The lifting bracket 12 is disposed through the vent holes 10, and the portion of the lifting bracket 12 located inside the test barrel 3 is fixedly connected to the heat-conducting barrel 14 via a fixing bracket 13. A cylindrical rod 121 is fixedly connected to the upper surface of the test barrel 3. The lifting bracket 12 is slidably sleeved on the outside of the cylindrical rod 121, and a disc 122 is fixedly installed on the cylindrical rod 121, with the disc 122 fitting against the upper part of the lifting bracket 12. A buffer spring 123 is elastically connected between the lifting bracket 12 and the test barrel 3.

[0039] Please see Figure 8 and Figure 11 A hollow column 17 is fixedly installed at the bottom of the heat-conducting tank 14 along the axial direction. A positioning rod 18 is slidably connected through the hollow column 17 and the heat-conducting tank 14. Multiple crossbars 19 are fixed at equal angles along the axial direction at the bottom of the positioning rod 18. A liquid level sensor 20 is fixedly installed at the bottom of the crossbars 19. A floating airbag 21 is fixedly installed between the multiple crossbars 19.

[0040] The testing device is moved on the asphalt pavement by the trolley 4. A suitable testing position is selected, and the threaded rod 5 is rotated via the handwheel on the trolley 4. Under the threaded transmission, the support frame 6 moves downwards on the trolley 4, causing the measuring cylinder 1 to move downwards, so that the bottom of the testing bucket 3 below the measuring cylinder 1 is in contact with the pavement. The sealing component 7 at the bottom of the testing bucket 3 is pressed tightly against the asphalt surface. An appropriate amount of testing water is added to the measuring cylinder 1, and the valve pipe 2 is opened to control the testing water inside the measuring cylinder 1 to enter the heat-conducting bucket 14. The amount of testing water in the heat-conducting bucket 14 gradually increases. The testing water is allowed to stand in the heat-conducting bucket 14 for one minute to balance the temperature difference between the testing water inside the heat-conducting bucket 14 and the asphalt surface (when the temperature difference between the water and the pavement is too large, the viscosity of the water will change; when the water temperature is higher than the pavement, the water viscosity decreases, the fluidity increases, and the penetration speed is faster; when the water temperature is lower than the pavement, the water viscosity decreases). The asphalt pavement's permeability is reduced due to increased temperature and decreased fluidity, resulting in slower penetration. Temperature differences also cause slight thermal expansion and contraction of the surface aggregates. For example, low-temperature water causes the aggregates to shrink, reducing pore size and hindering water penetration; high-temperature water causes the aggregates to expand slightly, opening pores and accelerating water penetration. Then, the horizontal intelligent control valve 15 is remotely activated, allowing the detection water in the heat-conducting tank 14, which is higher than the valve 15, to flow into the detection tank 3. The floating airbag 21, based on buoyancy in the detection water, moves the positioning rod 18 and the crossbar 19 upwards. The liquid level sensor 20 on the crossbar 19 detects changes in water level. When the water level inside the detection tank 3 drops to the threshold, the liquid level sensor 20 transmits the detection signal to the intelligent control terminal of the testing personnel. Based on the water penetration time (the detection tank 3 is made of transparent material, allowing for direct observation of water level changes), the permeability of the asphalt pavement is determined.

[0041] Since the horizontal intelligent control valve 15 is higher than the bottom surface of the heat conduction tank 14, after the test water in the heat conduction tank 14 enters the test tank 3 through the horizontal intelligent control valve 15, some water will remain inside the heat conduction tank 14. The gravity of the remaining water will drive the heat conduction tank 14, the fixed bracket 13 and the lifting bracket 12 to move downward, so that the lifting bracket 12 moves downward through the guide column 11. The lifting bracket 12 presses down the buffer spring 123, and moves downward slowly and steadily using the spring. Multiple lifting brackets 12 press down on the lifting ring 8, controlling the lifting ring 8 to be evenly pressed onto the sealing component 7, so that the sealing component 7 can be tightly attached to the asphalt ground. In the initial stage of water injection, the gravity of the test water can be used to maintain the adhesion between the sealing component 7 and the asphalt ground, avoiding gaps between the test device and the road surface, which would cause the test water to leak out.

[0042] Example 2: Please refer to Figure 3 - Figure 5 and Figure 7Based on Embodiment 1, a water flow transmission mechanism is also disclosed, the specific structure of which is as follows: the sealing component 7 includes an air pressure sealing ring 71 fixedly installed below the detection barrel 3, the air pressure sealing ring 71 has an inner groove 72 on the side near the detection barrel 3, and a water pressure sealing ring 73 is fitted in the inner groove 72.

[0043] Please see Figure 8 - Figure 12 The test tank 3 is equipped with a water flow transmission mechanism that increases the pressure of the water pressure sealing ring 73 by utilizing the liquid stored inside the heat-conducting tank 14. The water flow transmission mechanism includes two sets of drain pipes 22 that are connected through to the side of the heat-conducting tank 14. Two sets of water supply pipes 23 are connected through to the side of the water pressure sealing ring 73 near the test tank 3. The water supply pipes 23 are fixedly connected through to the test tank 3, and the water supply pipes 23 are telescopically connected below the drain pipes 22. A counterweight 24 is fixedly installed on the outside of the positioning rod 18. The counterweight 24 moves down and presses against the bottom surface of the heat-conducting tank 14. A push rod 25 is slidably connected along the axial direction in the drain pipe 22. The upper and lower surfaces of the push rod 25 have grooves 26. A transmission rod 27 is rotatably connected to the push rod 25. The other end of the transmission rod 27 is rotatably connected to the positioning rod 18.

[0044] As the test water in test tank 3 seeps into the asphalt surface, the test water level in test tank 3 gradually decreases. The floating airbag 21, along with the decreasing water level, causes the horizontal bar 19 and positioning rod 18 to move downwards. The counterweight 24 on the positioning rod 18, under the influence of gravity, also controls the downward movement of the positioning rod 18. At this time, the two ends of the transmission rod 27 connecting the positioning rod 18 and the push rod 25 rotate accordingly. The rotating transmission rod 27 pushes the push rod 25 to move inside the drain pipe 22. The part of the push rod 25 initially with the groove 26 is located at the opening of the drain pipe 22, allowing the liquid in the heat-conducting tank 14 to communicate with the inside of the drain pipe 22. When the push rod 25 moves laterally, its cylindrical end moves... The liquid is blocked inside the drain pipe 22, cutting off the connection between the drain pipe 22 and the heat-conducting barrel 14. During the movement of the push rod 25, the liquid inside the drain pipe 22 is squeezed. The liquid inside the drain pipe 22 and the water pipe 23 is squeezed into the water pressure sealing ring 73, increasing the pressure of the water pressure sealing ring 73. The water pressure sealing ring 73 is squeezed into the air pressure sealing ring 71, supplementing the expansion pressure of the entire sealing assembly 7. This makes the air pressure sealing ring 71 fit the asphalt pavement better, reducing the interference on the adhesion between the sealing assembly 7 and the ground when the water level inside the test barrel 3 changes significantly. This also prevents the test water from leaking out during the penetration test.

[0045] Simultaneously, when the water level inside the test tank 3 is low, the floating airbag 21 drives the positioning rod 18 to move downward to the lowest position. At this time, the counterweight 24 on the positioning rod 18 moves down and presses against the bottom surface of the heat-conducting tank 14, further pressing down on the heat-conducting tank 14. This keeps the heat-conducting tank 14, the fixed bracket 13, and the lifting bracket 12 pressed down on the lifting ring 8 and the sealing component 7, so that the sealing component 7 is always pressed tightly against the asphalt ground in the early, middle, and late stages of the test, improving the sealing effect of the entire penetration device and maintaining the reliability of the test data.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An asphalt pavement permeability testing device, comprising a measuring cylinder (1) for measuring the amount of water used to test the permeability of asphalt pavement, wherein a test bucket (3) is fixedly installed below the measuring cylinder (1) via a valve pipe (2), characterized in that: A trolley (4) is provided on the outside of the measuring cylinder (1) and the testing barrel (3). A threaded rod (5) is rotatably installed on the trolley (4). A support frame (6) is threaded on the threaded rod (5). The support frame (6) is slidably installed on the trolley (4) and fixedly installed on the outside of the measuring cylinder (1). A sealing assembly (7) is fixed at the bottom of the test barrel (3). A lifting ring (8) is slidably installed on the outside of the test barrel (3). The lifting ring (8) is pressed on the top of the sealing assembly (7). Multiple pressure blocks (9) are fixed at equal angles along the central axis direction on the outside of the test barrel (3). The pressure blocks (9) are pressed on the top of the lifting ring (8). Inside the test barrel (3), a heat-conducting barrel (14) is installed along the axial direction to balance the temperature of the test water and the asphalt ground. A horizontal intelligent control valve (15) and a vertical intelligent control valve (16) are installed on the heat-conducting barrel (14). The test tank (3) is equipped with a power transmission mechanism that uses a heat-conducting tank (14) to load the test water gravity-pressed sealing assembly (7).

2. The asphalt pavement permeability testing device according to claim 1, characterized in that: The power transmission mechanism includes a guide column (11) fixed at an equal angle to the outside of the detection barrel (3) along the axial direction. A lifting bracket (12) is slidably connected through the guide column (11). The lower end face of the lifting bracket (12) is pressed against the upper surface of the lifting ring (8).

3. The asphalt pavement permeability testing device according to claim 2, characterized in that: The upper surface of the test barrel (3) is provided with multiple exhaust holes (10) at equal angles along the axial direction. The lifting bracket (12) is installed through the exhaust holes (10), and the part of the lifting bracket (12) located inside the test barrel (3) is fixedly connected to the heat-conducting barrel (14) through the fixed bracket (13).

4. The asphalt pavement permeability testing device according to claim 3, characterized in that: A cylindrical rod (121) is fixedly connected to the upper surface of the detection barrel (3). The lifting bracket (12) is slidably sleeved on the outside of the cylindrical rod (121), and a disc (122) is fixedly installed on the cylindrical rod (121). The disc (122) is attached to the top of the lifting bracket (12). A buffer spring (123) is elastically connected between the lifting bracket (12) and the detection bucket (3).

5. The asphalt pavement permeability testing device according to claim 1, characterized in that: A hollow column (17) is fixedly installed at the bottom of the heat-conducting barrel (14) along the axial direction, and a positioning rod (18) is slidably connected through the hollow column (17) and the heat-conducting barrel (14). The bottom of the positioning rod (18) is fixed with multiple crossbars (19) at equal angles along the axial direction, and a liquid level sensor (20) is fixedly installed at the bottom of the crossbars (19). A floating airbag (21) is fixedly installed between multiple crossbars (19).

6. The asphalt pavement permeability testing device according to claim 5, characterized in that: The sealing assembly (7) includes a pneumatic sealing ring (71) fixedly installed below the test barrel (3). The pneumatic sealing ring (71) has an inner groove (72) on the side near the test barrel (3), and a water pressure sealing ring (73) is fitted in the inner groove (72).

7. The asphalt pavement permeability testing device according to claim 6, characterized in that: The detection barrel (3) is equipped with a water flow transmission mechanism that increases the pressure of the water pressure sealing ring (73) by means of the liquid stored inside the heat-conducting barrel (14).

8. The asphalt pavement permeability testing device according to claim 7, characterized in that: The water flow transmission mechanism includes two sets of drain pipes (22) that are connected through the side of the heat-conducting barrel (14). Two sets of water supply pipes (23) are connected through the side of the water pressure sealing ring (73) near the detection barrel (3). The water supply pipes (23) are fixedly connected through the detection barrel (3), and the water supply pipes (23) are telescopically connected below the drain pipes (22).

9. The asphalt pavement permeability testing device according to claim 8, characterized in that: The positioning rod (18) is externally fixed with a counterweight (24), which moves down and presses against the bottom surface of the heat-conducting barrel (14).

10. The asphalt pavement permeability testing device according to claim 8, characterized in that: A push rod (25) is slidably connected in the drain pipe (22) along the axial direction, and grooves (26) are opened on the upper and lower surfaces of the push rod (25); A transmission rod (27) is rotatably connected to the push rod (25), and the other end of the transmission rod (27) is rotatably connected to the positioning rod (18).

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