Permeability testing device for pervious concrete pavement

Abstract

The invention discloses a permeable concrete pavement permeability testing device, which relates to the technical field of concrete testing, and comprises a sample upper fixing seat, a sample lower fixing seat, a sealing cover, a water collecting cover, a water storage pipe and a flow meter. A water supplementing pipe is arranged above the water storage pipe, a floating ball is arranged at the bottom end of the water supplementing pipe, a movable pipe is arranged at the top end of the floating ball through a connecting rod, and a fixed pipe is arranged on the outer side of the movable pipe; a flow guide groove and a connecting groove are formed between the movable pipe and the fixed pipe, when the floating ball moves downwards due to the fact that the liquid level in the water storage pipe is lowered, the flow guide groove is communicated with the connecting groove, water in the water supplementing pipe can enter the water storage pipe and the water collecting cover, then the porosity of a sample can be measured, and the water permeability performance of the sample under different stable water pressures can be tested. And support is provided for large-area construction of the pervious concrete, so that a better construction effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete testing, and in particular to a device for testing the permeability of a permeable concrete pavement. Background Art

[0002] Permeable concrete, also known as porous concrete, sandless concrete or permeable floor, is a honeycomb structure with evenly distributed pores formed by a thin layer of cement paste covering the surface of coarse aggregate and bonding each other. It is breathable, water-permeable and lightweight. Permeable concrete can increase the permeable and breathable area of ​​the city, strengthen the heat and moisture exchange between the surface and the air, regulate the urban climate, reduce the surface temperature, help alleviate the urban "heat island phenomenon", improve the growth conditions of ground plants and soil microorganisms, and adjust the ecological balance. It has very good application prospects.

[0003] Porosity is a key indicator that determines the water permeability of pervious concrete. Conventional pervious concrete has 15%-25% pores, which reflects the size, quantity, distribution and connectivity of the pores inside the material. The water permeability coefficient of pervious concrete usually refers to the amount of water that can penetrate a unit area per unit time under a fixed water level. The water permeability coefficient is also called the most important measurement indicator in the research and development of pervious concrete. Generally, before large-scale pervious concrete construction, samples of pervious concrete must be made and parameters such as porosity and water permeability coefficient must be measured. Large-scale pervious concrete construction can only be carried out after meeting the standard requirements.

[0004] For example, a Chinese patent with publication number CN107703046A discloses a water permeability coefficient measuring instrument for permeable concrete, including a main mounting frame; a water tank-type test block fixture is installed on the upper part of the main mounting frame, a permeable water collecting part is installed in the middle part, a permeable water path is arranged at the lower part, and a weighing container and a water storage container are arranged at the bottom; an electric control unit is arranged on one side of the main mounting frame; the water tank-type test block fixture includes an openable and closable clamp and a clamp opening and closing control mechanism; an elastic material layer is arranged on the inner surface of each clamp; the clamp is provided with a water inlet and an overflow port; the permeable water path is divided into a drainage pipe and a metering water pipe, and a solenoid valve is arranged to switch the water flow between the drainage pipe and the metering water pipe; the drainage pipe is connected to the water outside, and the metering water pipe is connected to the weighing container; the electric control unit is provided with at least a control button, a control circuit and a relay; the control circuit and the relay control the solenoid valve to switch the flow direction of the permeable water. The water permeability coefficient measuring instrument of the present invention has very high testing convenience and accuracy, simple operation, time saving and labor saving. The present invention also provides a method for measuring the water permeability coefficient of permeable concrete using the measuring instrument.

[0005] There are still some problems in the practical application of similar technical solutions mentioned above. For example, this technical solution completes the permeability performance test by filling water into a water storage container above the concrete sample and judging the water penetration. However, during the test, the water in the container decreases as the penetration decreases, and the water pressure on the concrete sample changes, which will have a certain impact on the test accuracy, and it is impossible to measure the permeability under different constant water pressures. Moreover, similar to the above-mentioned technical solutions, it is impossible to measure the porosity of permeable concrete, and it is necessary to use an additional special measuring device to measure the porosity, which increases the measurement workload and is more troublesome.

[0006] Therefore, it is necessary to invent a permeability performance testing device for permeable concrete pavement to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide a permeability performance testing device for a permeable concrete pavement to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a permeability performance testing device for a permeable concrete pavement, comprising: a sample upper fixing seat, which is arranged at the top of the sample; a sample lower fixing seat, which is arranged at the bottom of the sample and connected to the sample upper fixing seat by a screw; a closed cover, whose two ends are respectively tightly fitted with the sample upper fixing seat and the sample lower fixing seat, and are located outside the sample; a water collecting cover, which is arranged at the middle of the top of the sample upper fixing seat, and a cavity is formed between the water collecting cover and the top of the sample; a water storage pipe, which is located at the middle of the top of the water collecting cover and is connected to the cavity above the sample ; a water supply pipe, which is located above the water storage pipe; a fixed pipe, which is located at the bottom end of the water supply pipe, and is provided with a slide groove inside, and the middle part of the outer wall of the fixed pipe is connected with the water supply pipe through a guide groove of a strip structure; a movable pipe, which is located inside the slide groove; a connecting groove, which is provided with a plurality of connecting grooves and is opened around the middle part of the movable pipe, and the connecting groove is connected with the guide groove; a guide hole, which is provided with a plurality of guiding holes and is located at the bottom end of the inner wall of the movable pipe; a float, which is located inside the water storage pipe and is connected to the bottom end of the movable pipe through a connecting rod; a flow meter, which is located above the water supply pipe and is connected with the water supply pipe through a telescopic pipe.

[0009] Preferably, in the initial position, the movable pipe is located at the bottom of the slide groove, and the connecting groove is communicated with the guide groove.

[0010] Preferably, it also includes: a circular groove, which is opened between the bottom end of the fixed tube and the outer side wall of the connecting rod; a positioning seat, which is located at the top end of the water supply pipe and fixedly connected to the lower end of the telescopic tube, one side of the positioning seat is connected to the bottom end of the flow meter through a positioning screw; a measuring rod is provided on the other side of the positioning seat, and a scale is provided on the measuring rod.

[0011] Preferably, it also includes: a water supply pipe, which is located at the top of the flow meter, and one end of the water supply pipe is provided with a water tank for storing detection water; a control valve, which is located between the water supply pipe and the water tank.

[0012] Preferably, it also includes: a water receiving tray, which is located at the bottom end of the sample lower fixing seat and forms a cavity between the water receiving tray and the sample lower fixing seat, and the test water that penetrates through the sample enters the water receiving tray and is collected; a support seat, the middle of which is provided with an annular structure and is located below the water receiving tray.

[0013] Preferably, the lower end of the water supply pipe extends into the water storage pipe, and there is a gap between the water supply pipe and the water storage pipe.

[0014] Preferably, it also includes: a sealing ring, whose cross section is set to an "L"-shaped structure and is located on the side where the upper sample fixing seat and the lower sample fixing seat are close to each other, and the sealing ring can fit tightly with the end of the sample.

[0015] Preferably, it also includes: a sealing pad, which is an elastic rubber pad and is located on the inner wall of the sealing cover, and the sealing pad can fit tightly with the outer wall of the sample.

[0016] Preferably, the slide groove and the movable tube are both configured as square structures, and the movable tube can slide up and down in the slide groove but cannot rotate.

[0017] Preferably, it also includes: a chassis, which has an openable and closable door and is located outside the sample upper fixing seat and the sample lower fixing seat, and a control system is provided above the chassis.

[0018] Technical effects and advantages of the present invention: 1. The present invention can measure the performance of multiple samples at the same time by setting multiple groups of fixing seats and sample lower fixing seats, thereby improving the test efficiency; through the setting of the closed cover, it can ensure to the greatest extent that water flows into the upper surface of the permeable concrete sample and flows out of the lower surface during the test, and does not flow out from the side surface, thereby improving the accuracy of the test.

[0019] 2. The present invention cooperates with the valve body, the water receiving tray, the positioning screw and other components to adjust the positioning seat to the first height position. The connection and closing of the connecting groove and the guide groove can be adjusted by the float to control the water inflow. The volume of the water inflow when no sample is added and the volume of the water inflow after the sample is added are calculated in turn. The porosity of the sample can be calculated based on the volume of the sample itself. The porosity of multiple samples can be measured and compared at the same time to obtain more accurate data, thereby providing support for large-scale construction of permeable concrete to obtain better construction effects.

[0020] 3. The present invention can achieve different stable water pressures through positioning screws, water receiving trays, and water collecting covers, that is, the sample will be subjected to corresponding different water pressures, and the water permeability of the sample under the stable water pressure can be observed and measured. By obtaining multiple sets of measurement data, a more comprehensive water permeability of the sample can be obtained, thereby providing support for large-area construction of permeable concrete to obtain better construction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a front schematic diagram of the overall structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the sample upper fixing seat and the sample lower fixing seat of the present invention.

[0024] Figure 4 It is a schematic diagram of the water supply pipe and water storage pipe structure of the present invention.

[0025] Figure 5 It is a schematic cross-sectional view of the water supply pipe and water storage pipe structure of the present invention.

[0026] Figure 6 It is a schematic diagram of the structure of the lower fixing seat and the supporting seat of the sample of the present invention.

[0027] Figure 7 It is a schematic diagram of the structure of the sample upper fixing seat, the sample lower fixing seat and the sealing cover of the present invention.

[0028] Figure 8 It is a schematic diagram of the structure of the water supply pipe, telescopic pipe and flow meter of the present invention.

[0029] Fig. 9 It is a schematic cross-sectional view of the water supply pipe structure of the present invention.

[0030] Fig.10 For the present invention Fig. 9 A schematic diagram of the enlarged structure in the middle.

[0031] In the figure: 1. Sample upper fixing seat; 11. Water collecting cover; 12. Water storage pipe; 2. Sample lower fixing seat; 21. Water collecting tray; 22. Support seat; 24. Connecting hose; 25. Threaded joint; 3. Sealing ring; 4. Closing cover; 41. Sealing pad; 5. Water supply pipe; 51. Fixed pipe; 511. Guide groove; 512. Circular groove; 52. Slide groove; 53. Movable pipe; 531. Connecting groove; 532. Guide hole; 54. Connecting rod; 55. Float; 6. Telescopic pipe; 61. Positioning seat; 62. Positioning screw; 63. Measuring rod; 7. Flow meter; 8. Water supply pipe; 81. Water tank; 82. Control valve; 9. Chassis. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 10 As shown, a permeability performance testing device for a permeable concrete pavement provided by the present invention comprises: A sample upper fixing seat 1, which is arranged in a ring structure and is located at the top of the sample (i.e., the permeable concrete sample); The sample lower fixing seat 2 is configured as an annular structure and is located at the bottom of the sample, and is connected to the sample upper fixing seat 1 through a screw.

[0034] There may be multiple groups of upper sample holders 1 and lower sample holders 2, and each group of upper sample holders 1 and lower sample holders 2 is a group, so that multiple samples can be tested at the same time, thereby improving the test efficiency.

[0035] The sealing ring 3 has an "L"-shaped cross section and is located on the side where the upper fixing seat 1 and the lower fixing seat 2 of the sample are close to each other. During the test, the sealing ring 3 can fit tightly with the outer periphery of the sample, ensuring to the greatest extent that water flows in from the upper surface of the sample and out from the lower surface during the test, and does not flow out from the side surface, thereby improving the accuracy of the test.

[0036] The water receiving tray 21 is located at the bottom end of the sample lower fixing seat 2 and forms a cavity with the sample lower fixing seat 2. The test water that penetrates and passes through the sample enters the water receiving tray 21 to be collected and discharged; the support seat 22 has an annular structure in the middle and is located below the water receiving tray 21 to support the water receiving tray 21 and the sample lower fixing seat 2; the water receiving tray 21 is connected with a connecting hose 24, which is connected to the water receiving tray 21 through a threaded joint 25, and a valve body is provided on the connecting hose 24.

[0037] The closing cover 4 has two ends which are respectively tightly fitted with the upper fixing seat 1 and the lower fixing seat 2 of the sample and are located on the periphery of the sample; the sealing pad 41 is an elastic rubber pad and is located on the inner wall of the closing cover 4. The sealing pad 41 can fit tightly with the outer wall of the sample, ensuring that during the test, water can only flow in from the upper surface of the permeable concrete and flow out from the lower surface, and will not flow out from the side surface, thereby improving the accuracy of the test.

[0038] The water collecting cover 11 is located at the middle of the top of the fixing base 1 on the sample, and a cavity is formed between the water collecting cover 11 and the top of the sample. During the penetration test, water can penetrate into the sample through the water collecting cover 11; A water storage pipe 12, which is located at the middle of the top of the water collecting cover 11 and communicates with the cavity above the sample, and water for penetration test can be injected into the water storage pipe 12; The water supply pipe 5 is located above the water storage pipe 12. The lower end of the water supply pipe 5 extends into the water storage pipe 12. There is a gap between the water supply pipe 5 and the water storage pipe 12, which can play a role in exhaust and overflow.

[0039] The fixed pipe 51 is located at the bottom end of the water supply pipe 5 and is provided with a slide groove 52 inside. The middle part of the outer wall of the fixed pipe 51 is connected with the water supply pipe 5 through a guide groove 511 of a strip structure.

[0040] The movable tube 53 is located inside the slide groove 52 ; the slide groove 52 and the movable tube 53 are both configured as square structures, and the movable tube 53 can slide up and down in the slide groove 52 but cannot rotate.

[0041] The connecting grooves 531 are provided in multiple numbers and are opened around the middle of the movable tube 53. In the initial position, the movable tube 53 is located at the bottom of the slide groove 52. At this time, the connecting grooves 531 are connected with the guide grooves 511, and the connecting grooves 531 and the guide grooves 511 can form a water replenishment channel.

[0042] The float ball 55 is located inside the water storage pipe 12 and is connected to the bottom end of the movable pipe 53 through a connecting rod 54 .

[0043] There are multiple guide holes 532 located at the bottom of the inner wall of the movable tube 53, and are evenly arranged along the tangential direction of the annular area at the bottom of the movable tube 53; the circular groove 512 is opened at the bottom of the fixed tube 51 and between the outer wall of the connecting rod 54. Water can enter the movable tube 53 through the connecting groove 531 and the guide groove 511, and then flow out from the guide holes 532 and the circular groove 512, and then flow along the connecting rod 54 into the water storage pipe 12, and then flow into the water collecting cover 11, preparing for the test of permeable concrete.

[0044] The flow meter 7 is located above the water supply pipe 5 and is connected to the water supply pipe 5 through the telescopic pipe 6; specifically, the telescopic pipe 6 can be a corrugated telescopic pipe.

[0045] The positioning seat 61 is located at the top of the water supply pipe 5 and is fixedly connected to the lower end of the telescopic pipe 6. One side of the positioning seat 61 is connected to the bottom end of the flow meter 7 through a positioning screw 62. By adjusting the adjusting nut on the positioning screw 62, the positioning seat 61 can be driven to move up and down, and then the telescopic pipe 6 can be compressed or stretched by the positioning seat 61 to adjust the length of the telescopic pipe 6; and by adjusting the length of the telescopic pipe 6, the height of the water supply pipe 5 below it and the float 55 below the water supply pipe 5 can be adjusted, so that the height of the float 55 can be controlled to achieve the effect of controlling the liquid level height in the water storage pipe 12, and then the water pressure in the water storage pipe 12 can be adjusted.

[0046] A measuring rod 63 is provided on the other side of the positioning seat 61 . A scale is provided on the measuring rod 63 . When the length of the telescopic tube 6 is adjusted by the positioning screw 62 , the corresponding value can be obtained by the scale on the measuring rod 63 .

[0047] The water supply pipe 8 is located at the top of the flow meter 7, and one end of the water supply pipe 8 is provided with a water tank 81 for storing water for testing; the control valve 82 is located between the water supply pipe 8 and the water tank 81, and the control valve 82 can control the on-off of the water channel inside the water supply pipe 8.

[0048] The case 9 has an openable and closable door and is located outside the upper sample holder 1 and the lower sample holder 2. The case 9 can provide a closed environment for the experiment to reduce the impact of the external environment on the test process. A control system is provided above the case 9. The control system can collect data from related components such as the flow meter 7 and can also control the switch of the control valve 82 on the water supply pipe 8.

[0049] By using the permeability testing device for a permeable concrete pavement of the present embodiment, at least the porosity of the sample and the water permeability of the sample under different stable water pressures can be tested.

[0050] Specifically, when testing the porosity of the sample, first close the valve body on the connecting hose 24 so that the water discharged into the water receiving tray 21 will not flow out. After installing the upper sample holder 1 and the lower sample holder 2, adjust the adjusting nut on the positioning screw 62, and at the same time adjust the positioning seat 61 to the first height position by observing the scale on the measuring rod 63. Then open the control valve 82, and the water in the water tank 81 enters the water supply pipe 5 through the water supply pipe 8, the flow meter 7, and the telescopic pipe 6. Since the connecting groove 531 is connected to the guide groove 511 at this time, the water flows into the movable pipe 53 through the connecting groove 531 and the guide groove 511, and then flows along the connecting rod 54 to the water storage pipe 12, and then flows to the water collecting cover 11, and is finally collected in the water receiving tray 21. As the amount of water increases, the water level reaches the height where the float 55 is located; as the amount of water further increases, the float 55 will be pushed to move upward, and the float 55 will drive the movable tube 53 to move upward through the connecting rod 54, and the movable tube 53 will drive the connecting groove 531 to move upward, gradually making the connecting groove 531 and the guide groove 511 staggered, as the connecting groove 531 continues to move upward, it will eventually no longer be connected with the guide groove 511, at this time, the water flow can no longer continue to enter the movable tube 53 and the components below, that is, there is no water flowing in the water supply pipe 8, at this time, the water flow can be calculated by the flow meter 7, which is counted as Q1. Then open the valve body on the connecting hose 24 to drain the water in the water receiving tray 21; then open the upper fixing seat 1 of the sample, place the sample in the closed cover 4, and then fix the upper fixing seat 1 of the sample. The upper fixing seat 1 of the sample and the lower fixing seat 2 of the sample can be used to clamp and fix the two ends of the sample, and the closed cover 4 can be sleeved on the outside of the sample to achieve the closure of the side of the sample, ensuring that during the detection process, the water entering the water collecting cover 11 can only flow in from the upper surface of the sample and then flow out from the lower surface of the sample, and will not flow out from the periphery of the sample to avoid affecting the test effect. By observing the scale on the measuring rod 63, the positioning seat 61 is still fixed on the basis of the first height position, and the above operation is repeated to make the water flow pass through the sample and gradually submerge the sample until the water flow can no longer continue to enter the movable tube 53 and the components below, that is, there is no water flowing in the water supply pipe 8. At this time, the water flow rate can be calculated by the flow meter 7 and counted as Q2. The volume of the sample can be measured when making the sample, recorded as Q3; generally, when making the sample, it is made into a regular shape, such as a cylinder, to facilitate the measurement of the sample volume, and the porosity of the sample is recorded as K, then K=1-(Q1-Q2) / Q3. Due to the sample's own water absorption and minimal water loss, all are within the acceptable error range.

[0051] Through the above operation, with the cooperation of various related components, the porosity of the sample can be accurately measured by flow measurement, which is easy to operate. Moreover, the porosity of multiple samples can be measured at the same time and compared to obtain more accurate data.

[0052] In another embodiment, when testing the water permeability of a sample, the corresponding water permeability of the sample can be tested under different stable water pressures.

[0053] Specifically, following the operation of the above embodiment, after draining the water in the water receiving tray 21 through the valve body on the connecting hose 24, close the valve body; then adjust the adjusting nut on the positioning screw 62, and at the same time adjust the positioning seat 61 to the second height position by observing the scale on the measuring rod 63. Then refill water until the water receiving tray 21, the water collecting cover 11 and the water storage pipe 12 are full of water, and then the float 55 will float up, and finally the connecting groove 531 will be staggered with the guide groove 511, and the water inlet of the movable pipe 53 will be closed, and no water will enter.

[0054] Then open the valve body on the connecting hose 24 to drain water. As the amount of water in the water receiving tray 21 decreases, the water above the sample flows out through the sample, and the water level in the water storage pipe 12 drops, which will drive the float 55 down until the connecting groove 531 is connected to the guide groove 511, and then replenish water into the movable tube 53 through the connecting groove 531 and the guide groove 511; in this process, the float 55 will float up and down slightly until the amount of water replenished into the movable tube 53 is equal to the amount of water discharged by the valve body on the connecting hose 24, and the water inlet and outlet are balanced, and the float 55 can be stably maintained at the corresponding height position; when the float 55 is in this stable position, the water level in the water storage pipe 12 is also at a stable height. At this time, the water pressure of the water in the water storage pipe 12 and the water collecting cover 11 on the sample is also stable. The water pressure can be recorded as P1, and the water permeability of the sample under this stable water pressure can be observed and measured.

[0055] When it is necessary to change the water pressure of the sample in order to obtain the water permeability of the sample under other stable water pressures, adjust the adjusting nut on the positioning screw 62, and at the same time adjust the positioning seat 61 to the third height position by observing the scale on the measuring rod 63. According to the process described above, after the float 55 is finally stabilized, the water pressure of the water in the water storage pipe 12 and the water collecting cover 11 on the sample is also stable. The water pressure can be recorded as P2, and the water permeability of the sample under this stable water pressure can be observed and measured.

[0056] It should be noted that if the third height position is higher than the second height position, the height corresponding to the float 55 at the third height position is greater than the height corresponding to the float 55 at the second height position, at this time P2 is greater than P1, and in this case, the water permeability of the sample under the stable water pressure can be observed and measured. If the third height position is lower than the second height position, the height corresponding to the float 55 at the third height position is less than the height corresponding to the float 55 at the second height position, at this time P2 is less than P1, and in this case, the water permeability of the sample under the stable water pressure can be observed and measured.

[0057] In order to simulate the water permeability of the sample under different water pressures, the positioning seat 61 can be adjusted to different heights according to the above-mentioned operation method, and the water permeability of the sample under the stable water pressure can be observed and measured. By obtaining multiple sets of measurement data, a more comprehensive water permeability of the sample can be obtained, thereby providing support for large-area construction of permeable concrete to obtain better construction effects.

[0058] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permeability testing device for a permeable concrete pavement, characterized in that: include: A sample upper fixing seat (1), which is arranged on the top of the sample; A lower sample fixing seat (2), which is arranged at the bottom of the sample and connected to the upper sample fixing seat (1) via a screw; A closed cover (4), the two ends of which are respectively tightly fitted with the upper sample fixing seat (1) and the lower sample fixing seat (2), and are located outside the sample; A water collecting cover (11) is arranged at the middle of the top of the sample upper fixing seat (1), and a cavity is formed between the water collecting cover (11) and the top of the sample; A water storage pipe (12), which is located in the middle of the top of the water collecting cover (11) and is connected to the cavity above the sample; A water supply pipe (5), which is located above the water storage pipe (12); A fixed pipe (51), which is located at the bottom end of the water supply pipe (5), and has a slide groove (52) inside, and the middle part of the outer wall of the fixed pipe (51) is connected to the water supply pipe (5) through a guide groove (511) with a strip structure; A movable tube (53) located inside the slide groove (52); A plurality of connecting grooves (531) are provided and are arranged around the middle of the movable tube (53), and the connecting grooves (531) are connected to the guide groove (511); A plurality of flow guide holes (532) are provided and are located at the bottom end of the inner side wall of the movable tube (53); A floating ball (55) is located inside the water storage pipe (12) and is connected to the bottom end of the movable pipe (53) via a connecting rod (54); The flow meter (7) is located above the water supply pipe (5) and is connected to the water supply pipe (5) via the telescopic pipe (6).

2. A permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: In the initial position, the movable tube (53) is located at the bottom of the slide groove (52), and the connecting groove (531) is connected to the guide groove (511).

3. A permeability testing device for a permeable concrete pavement according to claim 2, characterized in that: Also includes: A circular groove (512) is formed between the bottom end of the fixing tube (51) and the outer side wall of the connecting rod (54); A positioning seat (61) is located at the top end of the water supply pipe (5) and is fixedly connected to the lower end of the telescopic pipe (6); one side of the positioning seat (61) is connected to the bottom end of the flow meter (7) via a positioning screw (62); a measuring rod (63) is provided on the other side of the positioning seat (61), and a scale is provided on the measuring rod (63).

4. A permeability testing device for a permeable concrete pavement according to claim 3, characterized in that: Also includes: A water supply pipe (8), which is located at the top of the flow meter (7), and one end of the water supply pipe (8) is provided with a water tank (81) for storing test water; A control valve (82) is located between the water supply pipe (8) and the water tank (81).

5. A permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: Also includes: A water receiving tray (21) is located at the bottom end of the sample lower fixing seat (2) and forms a cavity between the tray and the sample lower fixing seat (2). The test water that permeates through the sample enters the water receiving tray (21) and is collected; The support seat (22) has an annular structure in its middle and is located below the water receiving tray (21).

6. A permeability performance testing device for a permeable concrete pavement according to claim 5, characterized in that: The lower end of the water supply pipe (5) extends into the water storage pipe (12), and a gap exists between the water supply pipe (5) and the water storage pipe (12).

7. A permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: Also includes: The sealing ring (3) has an L-shaped cross section and is located on a side where the upper sample fixing seat (1) and the lower sample fixing seat (2) are close to each other. The sealing ring (3) can fit tightly against the end of the sample.

8. The permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: Also includes: The sealing pad (41) is an elastic rubber pad and is located on the inner wall of the sealing cover (4). The sealing pad (41) can fit tightly against the outer wall of the sample.

9. The permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: The slide groove (52) and the movable tube (53) are both configured as square structures, and the movable tube (53) can slide up and down in the slide groove (52) but cannot rotate.

10. The permeability testing device for a permeable concrete pavement according to claim 1, characterized in that: Also includes: The machine box (9) has an openable and closable door and is located outside the sample upper fixing seat (1) and the sample lower fixing seat (2). A control system is provided above the machine box (9).

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