A OGFC asphalt pavement drainage test detection system and method

Abstract

The invention relates to the field of engineering detection technology, and discloses an OGFC asphalt pavement drainage test detection system, comprising a water storage tank, a rainfall unit, a specimen unit, a runoff unit, a backwater unit, a water seepage unit and a water permeability metering unit; the rainfall unit comprises a rainfall plate and a rainfall pipe; the specimen unit comprises a specimen body and a support plate, and a water retaining plate is also arranged on the support plate; the runoff unit comprises a runoff pipe, a runoff plate and a return water tank, the runoff plate is a U-shaped structure, one end of the runoff plate away from the runoff pipe is connected to the support plate, and the return water tank is connected to the water storage tank; the backwater unit comprises a support frame and a water retaining member, and the bottom end of the water retaining member contacts the specimen body; the water seepage unit comprises a water seepage box and a lifting frame, the water seepage box is slidably assembled on the lifting frame, and a sealing strip is arranged at the bottom of the water seepage box; the water permeability metering unit comprises a plate flow meter and a water collecting tank. The comprehensive porosity can be obtained by integrating various road surface factors, providing scientific and reasonable guidance for the actual layout of the road surface.

Description

Technical Field

[0001] The invention relates to the technical field of engineering detection, and in particular to an OGFC asphalt pavement drainage test detection system and method. Background Art

[0002] The material of permeable asphalt pavement is essentially a porous medium, and the essential characteristic of the gradation of permeable asphalt pavement is the aggregate interlocking structure, that is, the aggregate skeleton constitutes the path for load transfer. In theory, the aggregate skeleton is stable even without a binder. In terms of the essential characteristics of gradation, permeable asphalt pavement is the same as SMA pavement, the difference is the degree of filling of the pores in the coarse aggregate skeleton. Therefore, it can be inferred that the highest porosity can be obtained if there is only a coarse aggregate skeleton.

[0003] Open Graded Friction Course (OGFC), also known as drainage asphalt concrete wearing course or permeable pavement, can drain precipitation from the pavement through the interconnected gaps inside the structure, so that there is no water accumulation on the pavement. It generally has a high porosity (18% to 25%). When using permeable pavement, its porosity and drainage need to be further tested. At present, variable head permeability coefficient meters are commonly used at home and abroad to measure the permeability coefficient of permeable pavement. my country's current regulations use variable head permeability coefficient meters to measure the permeability coefficient of rolled asphalt mixture specimens.

[0004] For example, the patent with authorization announcement number CN205426738U discloses an OGFC rainfall simulation device and a water permeability tester, including a water pressure controller, a rainfall controller for simulating rainfall, a rutting plate test trough and a water permeability meter, the water outlet of the water pressure controller is connected with a water pipe, the water pressure controller is connected with the water inlet of the rainfall controller through the water pipe, the water pressure controller stably supplies water to the rainfall controller through the water pipe, the rutting plate test trough is arranged directly below the rainfall controller, the rutting plate test trough has the same shape as the rainfall controller, a rutting plate specimen to be tested is arranged in the rutting plate test trough, a drainage surface is opened on the side wall of the rutting plate test trough, the rutting plate test trough is used to make the rutting plate specimen simulate receiving rainfall simulated by the rainfall controller, the water permeability meter is arranged below the drainage surface and receives water discharged from the drainage surface by the rutting plate test trough, and the water permeability meter is used to measure the water permeability of the rutting plate specimen.

[0005] The above-mentioned tester performs a comprehensive test on the vertical and horizontal linkage permeability conditions of the rutting plate specimen by simulating rainfall. However, the above-mentioned tester is a test of the water permeability of the permeable asphalt mixture, that is, it is only a test of the water permeability of the permeable asphalt mixture itself. Studies have found that the drainage performance and drainage law of the permeable asphalt surface layer of the actual road surface cannot be expressed by the lateral and longitudinal permeability coefficients of the permeable asphalt mixture itself, but are also affected by multiple factors such as surface runoff, waterlogging height difference, precipitation intensity, etc., and the existing measuring instruments cannot perform comprehensive tests on these influencing factors. Summary of the invention

[0006] The purpose of the present invention is to provide an OGFC asphalt pavement drainage test detection system to solve the problem that the prior art only tests the water permeability of the permeable asphalt mixture itself and cannot integrate multiple pavement factors; the present invention also provides an OGFC asphalt pavement drainage test detection method using the OGFC asphalt pavement drainage test detection system.

[0007] In order to achieve the above-mentioned object, the present invention provides an OGFC asphalt pavement drainage test detection system, including a water storage tank, a rainfall unit, a specimen unit, a runoff unit, a backwater unit, a water seepage unit and a water permeability metering unit;

[0008] The rainfall unit comprises a rainfall pan and a rainfall pipe, wherein the rainfall pipe is connected between the water storage tank and the rainfall pan;

[0009] The specimen unit comprises a specimen body and a support plate, wherein the support plate is arranged at the front and rear sides of the specimen body, and a water baffle extending in the front and rear direction is also arranged on the support plate, and the water baffle is located at the edge of the specimen body, and the support plate and the water baffle are both sealed and connected to the specimen body, and the support plate and the water baffle form a water flow channel;

[0010] The runoff unit comprises a runoff pipe, a runoff plate and a return water tank, one end of the runoff pipe is connected to the water storage tank, and the other end is connected to the runoff plate, the runoff plate is a U-shaped structure, one end of the runoff plate away from the runoff pipe is connected to the support plate, one end of the runoff plate close to the runoff pipe is higher than the end close to the support plate, the return water tank is in communication with the water flow channel, and a return water pipe is connected between the return water tank and the water storage tank;

[0011] The water blocking unit comprises a support frame and a water blocking member arranged on the support frame, and the bottom end of the water blocking member is in contact with the specimen body;

[0012] The water seepage unit comprises a water seepage box and a lifting frame, wherein the water seepage box is arranged below the rain tray, the water seepage box is vertically slidably assembled on the lifting frame, the water seepage box is arranged on the upper side of the specimen body, and a sealing strip which is sealed with the specimen body is arranged at the bottom of the water seepage box;

[0013] The water permeability metering unit comprises a plate-type flow meter and a water collecting box. The water collecting box is arranged at the lower side of the specimen body. A telescopic hose is connected between the water collecting box and the plate-type flow meter.

[0014] Preferably, the specimen unit further comprises adjusting legs, which comprise four groups and are spaced apart in a rectangular shape, a ball joint seat being arranged between the top end of each adjusting leg and the support plate, and each adjusting leg being used to adjust the height of the support plate.

[0015] Preferably, the adjusting leg comprises a sleeve and a telescopic rod, the bottom end of the telescopic rod is threadedly assembled on the sleeve, and the top end of the telescopic rod is hinged to the ball joint seat.

[0016] Preferably, the support frame includes a bottom guide rail, a guide leg, a support and a support beam, the guide leg is fixedly arranged on the lower side of the support, the guide leg is rollingly assembled on the bottom guide rail, the support beam is guide-assembled on the support, the moving direction of the support beam is perpendicular to the moving direction of the guide leg, and the water retaining member is fixedly arranged on the lower side of the support beam.

[0017] Preferably, the support is provided with a motor, a driving rod transmission-connected to the motor, and a guide rod spaced apart and parallel to the driving rod; one end of the support beam is threadedly assembled with the driving rod, and the other end is sleeved on the guide rod.

[0018] Preferably, at least two groups of the support beams are arranged at intervals along the axial direction of the guide rod, and the water retaining member is arranged at the bottom of each group of the support beams.

[0019] Preferably, the runoff unit further comprises a runoff water tank, which is connected to the runoff pipe and is located between the water storage tank and the runoff plate.

[0020] Preferably, the radial flow pipe comprises a main pipe and a branch pipe connected to the main pipe, there are multiple branch pipes, each of which extends along the width direction of the radial flow plate, and a radial flow valve is arranged between two adjacent branch pipes on the main pipe.

[0021] Preferably, the backwater unit further comprises a backwater plate, which is arranged on a side of the water retaining plate away from the runoff plate, and the backwater plate is sealed and detachably connected to the support plate.

[0022] The present invention also provides an OGFC asphalt pavement drainage test detection method, using the OGFC asphalt pavement drainage test detection system described in any of the above technical solutions, comprising the following steps:

[0023] S1, close the runoff unit and move the backwater unit to one side of the specimen unit. The seepage box of the seepage unit moves downward on the lifting frame until the sealing strip at the bottom fits with the specimen body. The rainfall unit works, and the rainfall plate introduces rainwater into the seepage box. The water flows through the specimen body and penetrates into the water collection tank, and flows into the plate flow meter through the telescopic hose. The initial porosity of the specimen body is calculated by the seepage amount and seepage time.

[0024] S2, close the water seepage unit, and move the backwater unit to one side of the specimen unit, the runoff pipe of the runoff unit forms runoff, the runoff flows through the runoff plate and the support plate through the specimen body, and then the runoff returns to the water storage tank through the return water tank and the return water pipe, forming a water flow cycle, and by adjusting the flow rate of the runoff, obtain the first porosity at different flow rates;

[0025] S3, changing the height of each adjusting leg, adjusting the height and inclination angle of the support plate, and repeating step S2 to obtain a second porosity of the specimen body at different inclination angles;

[0026] S4, moving the backwater unit to the upper side of the specimen unit, the water retaining member contacts the specimen body, and repeating step S2 to obtain a third porosity of the specimen body in the backwater state;

[0027] S5, start the motor on the support, the motor drives the support beam to move, the water retaining member moves on the specimen body, adjust the moving speed of the water retaining member, repeat step S2, and obtain the fourth porosity of the specimen body at different speeds of the water retaining member;

[0028] S6, arranging a backwater plate on the support plate, selecting backwater plates of different heights as needed, changing the backwater height difference, and repeating step S2 to obtain a fifth porosity of the specimen body under different backwater height differences;

[0029] S7, draw a chart of the initial porosity, the first porosity, the second porosity, the third porosity, the fourth porosity, and the fifth porosity, fit the data, and obtain the comprehensive porosity under the combined influence of runoff velocity, backwater height difference, and precipitation intensity.

[0030] Compared with the prior art, the OGFC asphalt pavement drainage test detection system and method of the embodiment of the present invention has the following beneficial effects: the support plate and the water retaining plate of the specimen unit form a water flow channel, the water flow of the runoff unit flows through the runoff plate and flows through the water flow channel, and the water flow flows over the specimen body, so the porosity under the influence of the runoff can be measured; the water retaining member of the water retaining unit is in contact with the specimen body, and water backing is formed when the runoff passes through the water retaining member, so the porosity under the influence of water backing can be detected; the water flow of the seepage box passes through the specimen body, so the initial porosity at a time without external influence can be detected, and each porosity is fitted and analyzed, so that a variety of pavement factors can be combined to obtain a comprehensive porosity, providing scientific and reasonable guidance for the actual layout of the pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the OGFC asphalt pavement drainage test detection system of the present invention;

[0032] Figure 2 yes Figure 1 A schematic diagram of the structure of the support frame of the backwater unit of the OGFC asphalt pavement drainage test system;

[0033] Figure 3 yes Figure 1 The schematic diagram of the runoff unit of the OGFC asphalt pavement drainage test system;

[0034] Figure 4 yes Figure 1 Schematic diagram of the structure of the specimen unit of the OGFC asphalt pavement drainage test system.

[0035] In the figure, 1, water storage tank, 2, rainfall unit, 21, rainfall tray, 22, rainfall pipe, 3, specimen unit, 31, specimen body, 32, support plate, 33, water retaining plate, 34, adjustment leg, 341, sleeve, 342, telescopic rod, 4, runoff unit, 41, runoff pipe, 411, main pipe, 412, branch pipe, 413, runoff valve, 42, runoff plate, 43, return water tank, 44, return water pipe, 45, runoff water tank, 5 , water-blocking unit, 51, water-blocking member, 52, supporting frame, 521, bottom guide rail, 522, guide leg, 523, support, 524, supporting beam, 525, motor, 526, driving rod, 527, guide rod, 53, water-blocking plate, 6, water seepage unit, 61, water seepage tank, 62, lifting frame, 7, water seepage metering unit, 71, plate flow meter, 72, water collecting tank, 73, telescopic hose, 8, water pump, 9, valve. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] A preferred embodiment of an OGFC asphalt pavement drainage test detection system of the present invention is as follows: Figures 1 to 4 As shown, the OGFC asphalt pavement drainage test detection system includes a water storage tank 1, a rainfall unit 2, a specimen unit 3, a runoff unit 4, a backwater unit 5, a water seepage unit 6 and a water permeability metering unit 7.

[0038] The water storage tank 1 can be arranged on the ground foundation. The water storage tank 1 is used to store test water. At the same time, the water storage tank 1 is also arranged with a flow control module, a time control module, a flow rate control module, a water pressure control module, etc., which can detect the water flow, flow rate, water pressure and test time in the test process in real time, so as to control the variables in the test process and improve the accuracy of the test results. The specific structures of the flow control module, the time control module, the flow rate control module and the water pressure control module are prior art and will not be described in detail here.

[0039] The rainfall unit 2 includes a rainfall pan 21 and a rainfall pipe 22. The rainfall pipe 22 is connected between the water storage tank 1 and the rainfall pan 21. A water pump 8 is also arranged on the rainfall pipe 22 to transport water from the water storage tank 1 to the rainfall pan 21. At the same time, the speed and flow rate of the water flow can be adjusted by controlling the working efficiency of the water pump 8. In this embodiment, the rainfall pan 21 is a rectangular structure. The rainfall pan 21 is arranged on the upper side of the water seepage unit 6 to provide test water to the water seepage unit 6; a valve 9 is connected to the rainfall pipe 22 to control the on and off of the water flow.

[0040] The specimen unit 3 includes a specimen body 31, a support plate 32 and a water retaining plate 33. The specimen body 31 is a road surface model of the porosity to be tested. The support plate 32 is arranged on the front and rear sides of the specimen body 31, wherein the front and rear direction is the flow direction of water when flowing through the specimen body 31. The water retaining plate 33 is located at the edge of the specimen body 31. The support plate 32 and the water retaining plate 33 are both sealed and connected to the specimen body 31, and the support plate 32 and the water retaining plate 33 form a water flow channel.

[0041] The water baffle plate 33 is arranged at the edge to ensure that the water can flow through the entire surface of the specimen body 31 to the maximum extent, thereby improving the accuracy of the measurement results. The support plate 32 and the water baffle plate 33 are both sealed and connected to the specimen body 31, which can prevent the water from penetrating from the edge of the water flow channel when flowing through the specimen body 31, so that the water can only penetrate downward from the specimen body 31, and the water volume obtained in the water collection tank is the water flow that penetrates from the specimen body 31, thereby ensuring the accuracy of the measurement results.

[0042] The runoff unit 4 includes a runoff pipe 41, a runoff plate 42 and a return water tank 43. One end of the runoff pipe 41 is connected to the water storage tank 1, and the other end is connected to the runoff plate 42. The runoff pipe 41 is used to transport water from the water storage tank 1 to the runoff plate 42, forming a runoff flowing through the specimen body 31, and measuring the porosity under the influence of the runoff. In this embodiment, a water pump 8 and a valve 9 are connected to the runoff pipe 41. The water pump 8 is used to transport water through the water storage tank 1 to the runoff pipe 41, and the valve 9 can adjust the on and off of the runoff pipe 41.

[0043] The runoff plate 42 is a U-shaped structure, and one end of the runoff plate 42 away from the runoff pipe 41 is connected to the support plate 32, and the end of the runoff plate 42 close to the runoff pipe 41 is higher than the end close to the support plate 32, so that the runoff plate 42 is an inclined structure, which is convenient for runoff flow. The runoff plate 42 is a U-shaped structure, the top of the runoff plate 42 is open, and the two sides can block the water flow. The width of the runoff plate 42 is equal to the distance between the water retaining plates 33 on the support plate 32, and the runoff plate 42 is sealed and connected to the water retaining plates 33 to prevent water from overflowing.

[0044] The return water tank 43 is connected to the water flow channel, and a return water pipe 44 is connected between the return water tank 43 and the water storage tank 1. The return water tank 43 is used to recover the water flow flowing out after passing through the specimen body 31. The water flow returns to the water storage tank 1 after passing through the return water tank 43 and the return water pipe 44, so as to realize the recycling of the water flow. In this embodiment, the return water pipe 44 is arranged with a water pump 8 to provide power for the water flow.

[0045] The water blocking unit 5 includes a support frame 52 and a water retaining member 51. The water retaining member 51 is arranged on the support frame 52, and the bottom end of the water retaining member 51 contacts the upper surface of the specimen body 31. The support frame 52 is the supporting base of the water retaining member 51. After the water retaining member 51 contacts the specimen body 31, the water flow is blocked by the water retaining member 51 when flowing through the specimen body 31, and water is formed at the water retaining member 51, thereby simulating the water blocking state of the road surface and measuring the porosity of the road surface under the water blocking state. In this embodiment, the water retaining member 51 is a columnar structure, the top end of the water retaining member 51 is fixedly connected to the support frame 52, and the bottom end is in contact with the specimen body 31.

[0046] The water seepage unit 6 includes a water seepage box 61 and a lifting frame 62. The water seepage box 61 is arranged below the rain plate 21. The water seepage box 61 is vertically slidably assembled on the lifting frame 62. The water seepage box 61 is arranged on the upper side of the specimen body 31. A sealing strip is arranged at the bottom of the water seepage box 61. The sealing strip is used to seal and fit with the specimen body 31. In this embodiment, the horizontal cross-sectional size of the water seepage box 61 is the same as the upper surface size of the specimen body 31, ensuring that the water in the water seepage box 61 can penetrate the entire upper surface of the specimen body 31, thereby improving the accuracy of the test results.

[0047] The height of the water seepage box 61 can be adjusted when it moves on the lifting frame 62. When conducting measurements, the water seepage box 61 can be moved downward to the bottom to contact the specimen body 31. After the sealing strip is fitted with the specimen body 31, the contact position between the water seepage box 61 and the specimen body 31 is sealed, so that the water flow in the water seepage box 61 penetrates through the specimen body 31 to obtain the initial porosity of the specimen body 31 without other influences.

[0048] The water permeability metering unit 7 includes a plate-type flow meter and a water collecting box. The water collecting box is arranged at the lower side of the specimen body 31. A telescopic hose 73 is connected between the water collecting box and the plate-type flow meter. In this embodiment, the top of the water collecting box is sealed with the support plate 32. The water flows into the water collecting box after penetrating through the specimen body 31, and then enters the plate-type flow meter after passing through the telescopic hose 73. The telescopic hose 73 can compensate for the distance difference between the water collecting box and the plate-type flow meter when the state of the support plate 32 changes, thereby ensuring that the water flows into the plate-type flow meter.

[0049] During the test of the OGFC asphalt pavement drainage test detection system, the support plate 32 and the water retaining plate 33 of the specimen unit 3 form a water flow channel, the water flow of the runoff unit 4 flows through the runoff plate 42 and flows through the water flow channel, and the water flows over the specimen body 31, so that the porosity under the influence of the runoff can be measured; the water retaining member 51 of the water blocking unit 5 is in contact with the specimen body 31, and water blocking is formed when the runoff passes through the water retaining member 51, so that the porosity under the influence of water blocking can be detected; the water flow of the seepage box 61 passes through the specimen body 31, so that the initial porosity at a time without external influence can be detected, and each porosity is fitted and analyzed, and a variety of pavement factors can be combined to obtain a comprehensive porosity, providing scientific and reasonable guidance for the actual layout of the pavement.

[0050] Preferably, the specimen unit 3 also includes adjusting legs 34 , which include four groups and are distributed in a rectangular pattern. A ball joint seat is provided between the top of each adjusting leg 34 and the support plate 32 , and each adjusting leg 34 is used to adjust the height of the support plate 32 .

[0051] The top of the adjusting leg 34 is hinged to the support plate 32. When the height of each adjusting leg 34 is adjusted, the height of the support plate 32 connected to the adjusting leg 34 changes. By changing the height of each adjusting leg 34 so that the heights of the adjusting legs 34 are different, the support plate 32 is tilted under the action of the ball joint seat, and the porosity of the specimen body 31 under the coupling action of the tilted state and the runoff state can be measured.

[0052] Preferably, the adjusting leg 34 includes a sleeve 341 and a telescopic rod 342 , the bottom end of the telescopic rod 342 is threadedly assembled on the sleeve 341 , and the top end of the telescopic rod 342 is hinged to the ball joint seat.

[0053] The adjusting leg 34 is composed of a sleeve 341 and a telescopic rod 342 . When the sleeve 341 is rotated, the telescopic rod 342 is extended and retracted in the sleeve 341 under the action of the thread structure, thereby changing the height of the adjusting leg 34 .

[0054] Preferably, the support frame 52 includes a bottom guide rail 521, a guide leg 522, a support 523 and a support beam 524. The guide leg 522 is fixedly arranged on the lower side of the support 523. The guide leg 522 is rollingly assembled on the bottom guide rail 521. The support beam 524 is guide-assembled on the support 523. The moving direction of the support beam 524 is perpendicular to the moving direction of the guide leg 522. The water retaining member 51 is fixedly arranged on the lower side of the support beam 524.

[0055] When the guide leg 522 moves on the bottom rail 521, the position of the support 523 can be changed, and the position of the support frame 52 can be adjusted. When the porosity under the waterlogging state does not need to be measured, the support frame 52 can be moved away to avoid influence. The support beam 524 is guided and assembled on the support 523. When the support beam 524 moves, the water retaining member 51 on the support beam 524 moves on the surface of the specimen body 31, which can simulate the porosity when there are moving objects on the road surface, comprehensively simulate the road surface state, and improve the accuracy of the test results.

[0056] Preferably, a motor 525, a driving rod 526 transmission-connected to the motor 525, and a guide rod 527 spaced apart and parallel to the driving rod 526 are arranged on the support 523; one end of the support beam 524 is threadedly assembled with the driving rod 526, and the other end is sleeved on the guide rod 527.

[0057] When the motor 525 drives the driving rod 526 to rotate, the support beam 524 moves on the guide rod 527 and the driving rod 526, and can drive the water retaining member 51 to move. The motor 525 and the driving rod 526 are used to adjust the movement of the support beam 524, and the moving speed and moving position of the support beam 524 can be accurately controlled.

[0058] Preferably, at least two groups of support beams 524 are arranged at intervals along the axial direction of the guide rod 527 , and a water retaining member 51 is arranged at the bottom of each group of support beams 524 .

[0059] The support beams 524 are arranged in multiple groups, and the required number can be selected according to actual needs to simulate the water blocking state under different numbers of water retaining members 51, thereby improving the accuracy of the detection result. In this embodiment, three groups of water retaining members 51 are arranged on each group of support beams 524, and the three groups of water retaining members 51 are arranged at intervals. In other embodiments, the number of water retaining members 51 can be selected according to needs.

[0060] Preferably, the runoff unit 4 further includes a runoff water tank 45 , which is connected to the runoff pipe 41 and is located between the water storage tank 1 and the runoff plate 42 .

[0061] The runoff water tank 45 is connected to the runoff pipe 41 to buffer the water flow, ensure the stability of the water pressure, produce a steady flow effect, and reduce the gas in the water flow.

[0062] Preferably, the radial flow pipe 41 includes a main pipe 411 and a branch pipe 412 connected to the main pipe 411 . There are multiple branch pipes 412 , each branch pipe 412 extends along the width direction of the radial flow plate 42 . A radial flow valve 413 is arranged between two adjacent branch pipes 412 on the main pipe 411 .

[0063] The runoff pipe 41 is formed by a main pipe 411 and multiple branch pipes 412, and a runoff valve 413 is arranged between adjacent branch pipes 412. When simulating the runoff effect, the switch state of the runoff valve 413 can be adjusted according to the required runoff width, thereby changing the runoff width and measuring the porosity under different runoff widths.

[0064] Preferably, the backwater unit 5 further includes a backwater plate 53 , which is arranged on a side of the water retaining plate 33 away from the runoff plate 42 , and the backwater plate 53 is sealed and detachably connected to the support plate 32 .

[0065] A backwater board 53 is arranged between the water retaining plates 33, and the backwater board 53 can block the water flow to form a backwater height difference. The backwater board 53 is detachably connected to the support plate 32, and a backwater board 53 of a corresponding height can be selected according to the required backwater height difference, so as to measure the porosity under different backwater height differences.

[0066] The present invention also provides a preferred embodiment of an OGFC asphalt pavement drainage test detection method, using an OGFC asphalt pavement drainage test detection system of any of the above embodiments, comprising the following steps:

[0067] S1, close the runoff unit 4, and move the backwater unit 5 to one side of the specimen unit 3, the seepage box 61 of the seepage unit 6 moves downward on the lifting frame 62 until the sealing strip at the bottom fits with the specimen body 31, the rainfall unit 2 works, and the rainfall disk 21 allows rainwater to flow into the seepage box 61, the water flows through the specimen body 31 to penetrate into the water collecting tank, and flows into the plate flow meter through the telescopic hose 73, and the initial porosity of the specimen body 31 is calculated by the seepage amount and the seepage time.

[0068] S2, close the seepage unit 6, and move the backwater unit 5 to one side of the specimen unit 3, the runoff pipe 41 of the runoff unit 4 forms runoff, the runoff passes through the runoff plate 42 and the support plate 32 and flows through the specimen body 31, and then the runoff passes through the return water tank 43 and the return water pipe 44 and returns to the water storage tank 1, forming a water flow cycle, and by adjusting the flow rate of the runoff, the first porosity at different flow rates is obtained.

[0069] S3, changing the height of each adjusting leg 34, adjusting the height and the tilt angle of the support plate 32, and repeating step S2 to obtain the second porosity of the specimen body 31 at different tilt angles.

[0070] S4, move the water-blocking unit 5 to the upper side of the specimen unit 3, the water-blocking member 51 contacts the specimen body 31, and repeat step S2 to obtain the third porosity of the specimen body 31 in the water-blocking state.

[0071] S5, start the motor 525 on the support 523, the motor 525 drives the support beam 524 to move, the water retaining member 51 moves on the specimen body 31, adjust the moving speed of the water retaining member 51, repeat step S2, and obtain the fourth porosity of the specimen body 31 at different speeds of the water retaining member 51.

[0072] S6, arranging a backwater plate 53 on the support plate 32, selecting backwater plates 53 of different heights as needed, changing the backwater height difference, and repeating step S2 to obtain the fifth porosity of the specimen body 31 under different backwater height differences.

[0073] S7, draw a chart of the initial porosity, the first porosity, the second porosity, the third porosity, the fourth porosity, and the fifth porosity, fit the data, and obtain the comprehensive porosity under the combined influence of runoff velocity, backwater height difference, and precipitation intensity.

[0074] In this embodiment, the initial porosity, the first porosity, the second porosity, the third porosity, the fourth porosity, and the fifth porosity are measured respectively. When necessary, the height difference of the backwater, the flow velocity of the runoff, and the inclination angle of the support plate 32 can be coupled in pairs or adjusted simultaneously to simulate the comprehensive conditions of the road surface, thereby measuring the comprehensive porosity.

[0075] In summary, the embodiments of the present invention provide an OGFC asphalt pavement drainage test detection system and method, wherein the support plate and the water retaining plate of the specimen unit form a water flow channel, the water flow of the runoff unit passes through the runoff plate and flows through the water flow channel, and the water flow flows over the specimen body, so the porosity under the influence of the runoff can be measured; the water retaining member of the water retaining unit is in contact with the specimen body, and water backing is formed when the runoff passes through the water retaining member, so the porosity under the influence of water backing can be detected; the water flow of the seepage box passes through the specimen body, so the initial porosity at a time without external influence can be detected, and each porosity is fitted and analyzed, so that a comprehensive porosity can be obtained by integrating various pavement factors, thereby providing scientific and reasonable guidance for the actual layout of the pavement.

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An OGFC asphalt pavement drainage test detection system, characterized in that: It comprises a water storage tank (1), a rainfall unit (2), a test piece unit (3), a runoff unit (4), a backwater unit (5), a water seepage unit (6) and a water permeability metering unit (7); The rainfall unit (2) comprises a rainfall plate (21) and a rainfall pipe (22), wherein the rainfall pipe (22) is connected between the water storage tank (1) and the rainfall plate (21); The specimen unit (3) comprises a specimen body (31) and a support plate (32), wherein the support plate (32) is arranged at the front and rear sides of the specimen body (31), and a water baffle (33) extending in the front and rear directions is also arranged on the support plate (32), and the water baffle (33) is located at the edge of the specimen body (31), and the support plate (32) and the water baffle (33) are both sealedly connected to the specimen body (31), and the support plate (32) and the water baffle (33) form a water flow channel; The runoff unit (4) comprises a runoff pipe (41), a runoff plate (42) and a return water tank (43); one end of the runoff pipe (41) is connected to the water storage tank (1), and the other end is connected to the runoff plate (42); the runoff plate (42) is a U-shaped structure; one end of the runoff plate (42) away from the runoff pipe (41) is connected to the support plate (32); one end of the runoff plate (42) close to the runoff pipe (41) is higher than one end close to the support plate (32); the return water tank (43) is in communication with the water flow channel; a return water pipe (44) is connected between the return water tank (43) and the water storage tank (1); The water blocking unit (5) comprises a support frame (52) and a water blocking member (51) arranged on the support frame (52), and the bottom end of the water blocking member (51) is in contact with the specimen body (31); The water seepage unit (6) comprises a water seepage box (61) and a lifting frame (62), wherein the water seepage box (61) is arranged below the rain plate (21), the water seepage box (61) is vertically slidably assembled on the lifting frame (62), the water seepage box (61) is arranged on the upper side of the specimen body (31), and a sealing strip is arranged at the bottom of the water seepage box (61) to seal with the specimen body (31); The water permeability metering unit (7) comprises a plate-type flow meter and a water collecting box. The water collecting box is arranged on the lower side of the specimen body (31). A telescopic hose (73) is connected between the water collecting box and the plate-type flow meter.

2. The OGFC asphalt pavement drainage test detection system according to claim 1 is characterized in that: The specimen unit (3) further comprises adjusting legs (34), wherein there are four groups of adjusting legs (34) distributed at intervals in a rectangular shape, a ball joint seat is provided between the top end of each adjusting leg (34) and the support plate (32), and each adjusting leg (34) is used to adjust the height of the support plate (32).

3. The OGFC asphalt pavement drainage test detection system according to claim 2 is characterized in that: The adjustable leg (34) comprises a sleeve (341) and a telescopic rod (342); the bottom end of the telescopic rod (342) is threadedly assembled on the sleeve (341), and the top end of the telescopic rod (342) is hinged to the ball joint seat.

4. The OGFC asphalt pavement drainage test detection system according to any one of claims 1 to 3, characterized in that: The support frame (52) comprises a bottom guide rail (521), a guide leg (522), a support (523) and a support beam (524); the guide leg (522) is fixedly arranged on the lower side of the support (523); the guide leg (522) is rollingly assembled on the bottom guide rail (521); the support beam (524) is guide-assembled on the support (523); the moving direction of the support beam (524) is perpendicular to the moving direction of the guide leg (522); and the water retaining member (51) is fixedly arranged on the lower side of the support beam (524).

5. The OGFC asphalt pavement drainage test detection system according to claim 4 is characterized in that: The support (523) is provided with a motor (525), a driving rod (526) drivingly connected to the motor (525), and a guide rod (527) arranged in parallel and spaced relation to the driving rod (526); one end of the support beam (524) is threadedly assembled with the driving rod (526), ​​and the other end is sleeved on the guide rod (527).

6. The OGFC asphalt pavement drainage test detection system according to claim 5 is characterized in that: At least two groups of the support beams (524) are arranged at intervals along the axial direction of the guide rod (527), and the water retaining member (51) is arranged at the bottom of each group of the support beams (524).

7. The OGFC asphalt pavement drainage test detection system according to any one of claims 1 to 3, characterized in that: The runoff unit (4) further comprises a runoff water tank (45), wherein the runoff water tank (45) is connected to the runoff pipe (41), and the runoff water tank (45) is located between the water storage tank (1) and the runoff plate (42).

8. The OGFC asphalt pavement drainage test detection system according to any one of claims 1 to 3, characterized in that: The radial flow pipe (41) comprises a main pipe (411) and a branch pipe (412) connected to the main pipe (411). There are a plurality of branch pipes (412), each of which extends along the width direction of the radial flow plate (42). A radial flow valve (413) is arranged between two adjacent branch pipes (412) on the main pipe (411).

9. The OGFC asphalt pavement drainage test detection system according to any one of claims 1 to 3, characterized in that: The backwash unit (5) further comprises a backwash plate (53), which is arranged on a side of the water retaining plate (33) away from the runoff plate (42), and the backwash plate (53) is sealed and detachably connected to the support plate (32).

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