A municipal pavement water permeability detection device

Abstract

This invention belongs to the field of pavement permeability testing technology, specifically a municipal pavement permeability testing device, including a base, a measuring part, and a measuring cylinder. An outer platform and an inner platform are fixedly installed inside the base. A first rubber barrier membrane is installed at the bottom of the inner platform, and a second rubber barrier membrane is installed at the bottom of the outer platform. A first grounding component is installed inside the inner platform, and a second grounding component is installed inside the outer platform. Both the first and second grounding components deform the first and second rubber barrier membranes by moving towards the ground, thus covering the ground. A middle platform is provided between the outer and inner platforms. The lower part of the middle platform has a hollow and open inner cavity, and a control component is slidably installed inside. By sliding inside the middle platform, the first and second rubber barrier membranes deform, conforming to the uneven surface of the pavement to form two independent sealing barriers. This eliminates the need for traditional manual application of sealant, significantly improving sealing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of pavement permeability testing technology, specifically a municipal pavement permeability testing device. Background Technology

[0002] The permeability of a road surface is a key indicator for evaluating the quality of road construction, its resistance to water damage, and the effectiveness of sponge city construction. It is directly related to the service life of the road surface, driving safety, and the operational efficiency of the urban drainage system.

[0003] To accurately test the permeability of municipal pavements, the industry commonly uses pavement permeability testing devices (also known as pavement permeability meters) for on-site testing. By measuring the amount of water that seeps into the pavement per unit time, the permeability coefficient is calculated to determine whether the pavement permeability meets the relevant specifications.

[0004] Currently, the sealing between the base of existing municipal road permeability testing devices and the road surface is mostly achieved by manually applying sealant, putty, or laying ordinary rubber rings. After long-term use, municipal roads are prone to unevenness such as potholes, cracks, and wear. Ordinary rubber rings cannot completely fit the uneven parts of the road surface. When manually applying sealant or putty, not only is a lot of time required for application and leveling, but also waiting for the sealant to cure. The operation process is cumbersome and significantly reduces the testing efficiency.

[0005] Therefore, the present invention provides a device for testing the permeability of municipal road surfaces. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a municipal road surface permeability testing device according to the present invention, comprising a base, a measuring part and a measuring cylinder;

[0008] An outer platform and an inner platform are fixedly installed inside the base. A first rubber barrier membrane is provided at the bottom of the inner platform, and a second rubber barrier membrane is provided at the bottom of the outer platform.

[0009] The inner platform is equipped with a first grounding component, and the outer platform is equipped with a second grounding component. Both the first grounding component and the second grounding component deform the first rubber barrier and the second rubber barrier by moving towards the ground and covering the ground.

[0010] A middle platform is provided between the outer platform and the inner platform. The inner cavity below the middle part of the middle platform is hollow and open, and a control component is slidably installed inside. By sliding inside the middle platform, the first grounding component and the second grounding component are driven to deform the first rubber barrier film and the second rubber barrier film.

[0011] Below the central platform, there is a receiving ring for storing sealant. An extrusion plate is slidably installed inside the receiving ring, and an extrusion assembly is provided inside the receiving ring to extrude liquid sealant to fill the gap between the road surface and the first and second rubber barrier membranes, forming a temporary sealing layer.

[0012] The first grounding component includes a first sliding ring and a second sliding ring. Both the first sliding ring and the second sliding ring are slidably installed inside the inner platform. The second sliding ring is close to the middle platform. The axial width of the second sliding ring is smaller than the axial width of the first sliding ring, and the bottom end face of the first sliding ring protrudes axially from the bottom end face of the second sliding ring.

[0013] The second grounding component includes a third sliding ring and a fourth sliding ring, which are slidably mounted inside the outer platform. The fourth sliding ring is close to the middle platform. The axial width of the fourth sliding ring is smaller than the axial width of the third sliding ring, and the bottom end face of the third sliding ring protrudes axially from the bottom end face of the fourth sliding ring.

[0014] An air cavity is provided inside the middle part above the middle of the platform. A positioning platform is provided at the top of the inner platform and the outer platform. A multi-port pipe is provided inside the positioning platform for communication between the air cavity and the outer platform and the inner platform.

[0015] The top of the platform is provided with a first sealing ring, and one end of the multi-port pipe passes through the first sealing ring and communicates with the air cavity.

[0016] The control assembly includes a delivery cylinder, a piston, a delivery pipe, and a suction pipe. The delivery cylinder is slidably installed inside the central platform. Both the delivery pipe and the suction pipe are installed on the delivery cylinder. The other end of the delivery pipe is connected to the air chamber, and the other end of the suction pipe is connected to the external gas. The piston is slidably installed inside the delivery cylinder. Both the delivery pipe and the suction pipe are equipped with one-way valves.

[0017] A mounting platform is slidably installed at the bottom of the central platform. A transmission rod is rotatably installed inside the mounting platform. A reciprocating screw is threadedly connected inside the transmission rod. The other end of the reciprocating screw extends into the interior of the conveying cylinder and is fixedly connected to the piston. A moving gear is fixedly installed on the outer wall of the transmission rod. A toothed ring that meshes with the moving gear is fixedly installed inside the central platform.

[0018] A drive motor is fixedly installed on one side of the mounting platform, and the output shaft of the drive motor is fixedly connected to a power gear that meshes with the moving gear.

[0019] The extrusion assembly includes a mounting block, a flow divider, a baffle ball, a control gear, and a toothed plate.

[0020] The mounting block is detachably connected to the receiving ring, the diverter is slidably installed inside the mounting block, the diverter is connected to the outer platform through the second sealing ring, the control gear is fixedly connected to the balloon, and the toothed plate is fixedly installed inside the mounting block.

[0021] Two extrusion assemblies are provided, and the two extrusion assemblies are symmetrically arranged on the top of the receiving ring;

[0022] The first sliding ring, the second sliding ring, the third sliding ring, and the fourth sliding ring are all provided with through air holes.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The municipal road permeability testing device of the present invention uses air pressure to drive the extension of the first sliding ring, the second sliding ring, the third sliding ring and the fourth sliding ring, which pushes the first rubber barrier membrane and the second rubber barrier membrane to deform and conform to the uneven surface of the road surface, forming two independent sealing barriers. This eliminates the traditional method of manually applying sealant, significantly improves the sealing efficiency, avoids water leakage caused by poor sealing, and makes the permeability coefficient measurement results more accurate and reliable.

[0025] 2. The municipal road permeability testing device of the present invention, through the design of the shorter bottoms of the second and fourth sliding rings, provides space for the deformation of the first and second rubber resistive membranes. At this time, the first and second rubber resistive membranes will expand towards the lower part of the receiving ring. Under the action of air pressure, they further fill the potholes on the road surface and push the receiving ring upward. The two diversion pipes are respectively connected to the gas entering the outer platform and the inner platform, pushing the extrusion plate, thereby squeezing out the sealant inside the receiving ring and filling and sealing the gap between the first and second rubber resistive membranes, further improving the effect of sealing the water passage. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 This is a perspective view of the present invention;

[0028] Figure 2 This is a cross-sectional view of the base platform in this invention;

[0029] Figure 3 This is a schematic diagram of the installation of the positioning platform in this invention;

[0030] Figure 4 In this invention Figure 3 Enlarged view of point A in the image;

[0031] Figure 5 This is a schematic diagram of the external platform in this invention;

[0032] Figure 6 In this invention Figure 5 Enlarged view of point B in the image;

[0033] Figure 7 In this invention Figure 6 Enlarged view of point C in the image.

[0034] In the diagram: 1. Base platform; 2. Measuring cylinder; 3. Measuring section; 4. Outer platform; 5. Positioning platform; 6. Middle platform; 7. Inner platform; 8. First sealing ring; 9. Multi-port pipe; 10. Air chamber; 11. Conveying cylinder; 12. Suction pipe; 13. Conveying pipe; 14. Moving gear; 15. Power gear; 16. Piston; 17. Transmission rod; 18. Gear ring; 19. Mounting platform; 20. Extrusion plate; 21. First sliding ring; 22. Second sliding ring; 23. First rubber barrier membrane; 24. Third sliding ring; 25. Fourth sliding ring; 26. Second rubber barrier membrane; 27. Barrier balloon; 28. Control gear; 29. ​​Second sealing ring; 30. Diverter pipe; 31. Mounting block; 32. Receiving ring. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] An embodiment of the present invention provides a municipal road surface permeability testing device, comprising a base 1, a measuring part 3, and a measuring cylinder 2;

[0037] An outer platform 4 and an inner platform 7 are fixedly installed inside the base platform 1. A first rubber barrier membrane 23 is provided at the bottom of the inner platform 7, and a second rubber barrier membrane 26 is provided at the bottom of the outer platform 4.

[0038] Both the outer platform 4 and the inner platform 7 are annular. The outer platform 4 and the inner platform 7 have the same axis. The diameter of the outer platform 4 is larger than the diameter of the inner platform 7. The upper and lower ends of the outer platform 4 and the inner platform 7 are at the same horizontal level.

[0039] When the base platform 1 is placed on the ground, the support legs at the bottom of the base platform 1 will contact the ground. At this time, both the outer platform 4 and the inner platform 7 are far away from the ground. By deforming the first rubber barrier membrane 23 and the second rubber barrier membrane 26 set at the bottom of the outer platform 4 and the inner platform 7, they can conform to the uneven ground and block water, thereby maximizing the accuracy of road seepage detection. At the same time, the first rubber barrier membrane 23 and the second rubber barrier membrane 26 can form a double layer of protection.

[0040] The inner platform 7 is equipped with a first grounding component, and the outer platform 4 is equipped with a second grounding component. Both the first grounding component and the second grounding component deform the first rubber barrier 23 and the second rubber barrier 26 by moving towards the ground and covering the ground.

[0041] The bottom of the inner platform 7 is set with a cavity opening. The first rubber resist membrane 23 can be deformed and attached to the uneven road surface by moving the first grounding component toward the ground. Similarly, the second grounding component set inside the outer platform 4 also moves toward the road surface, causing the second rubber resist membrane 26 to deform and attach to the uneven road surface, thereby adapting to uneven phenomena such as potholes, cracks, and wear on the road surface.

[0042] A middle platform 6 is provided between the outer platform 4 and the inner platform 7. The inner cavity below the middle part of the middle platform 6 is hollow and open, and a control component is slidably installed inside. By sliding inside the middle platform 6, the first grounding component and the second grounding component are driven to deform the first rubber resistive film 23 and the second rubber resistive film 26.

[0043] The middle platform 6 is rotatably installed at the bottom of the base platform 1 and can rotate between the outer platform 4 and the inner platform 7. Through the set control components, while following the rotation of the middle platform 6, the first grounding component and the second grounding component can be driven to deform the first rubber resisting membrane 23 and the second rubber resisting membrane 26 for adhering to the road surface.

[0044] Below the central platform 6, there is a receiving ring 32 for storing sealant. An extrusion plate 20 is slidably installed inside the receiving ring 32. An extrusion assembly is installed inside the receiving ring 32 to extrude liquid sealant to fill the gap between the road surface and the first rubber barrier membrane 23 and the second rubber barrier membrane 26, and form a temporary sealing layer.

[0045] The sealant uses a water-soluble, peelable protective film adhesive. This material is an environmentally friendly, water-soluble, semi-transparent, viscous liquid. After spraying, it can quickly form a continuous and flexible sealing film layer on the road surface. The receiving ring 32 is located between the outer platform 4 and the inner platform 7, and also directly above the first rubber barrier film 23 and the second rubber barrier film 26. Through the cooperation of the extrusion assembly, the gap between the first rubber barrier film 23 and the second rubber barrier film 26 can be filled, further improving the sealing effect. At the same time, after the sealant is applied, it only forms a continuous and flexible solid film layer on the surface of the contact surface, without penetrating into the micropores of the road surface, and does not interact with the first rubber barrier film 26. The rubber barrier membrane 23 and the second rubber barrier membrane 26 are chemically bonded together. The cohesive force of the material itself is significantly higher than the interfacial adhesion to the road surface and the rubber substrate. Therefore, after the test is completed, the entire membrane can be completely peeled off without tearing or leaving any residue. There is no strong adhesive bond between the membrane and the rubber mold, and the separation is smooth and without sticking. At the same time, the material is water-soluble, and a small amount of residue can be quickly removed with water without polluting the road surface. Compared with the existing technology that uses manual application of sealant or putty, this method not only eliminates the need for on-site scraping and leveling, greatly reducing human intervention, but also does not produce stubborn adhesive stains or hard residues, which is more in line with the environmental protection and cleanliness requirements of municipal roads.

[0046] The first grounding component includes a first sliding ring 21 and a second sliding ring 22. Both the first sliding ring 21 and the second sliding ring 22 are slidably installed inside the inner platform 7. The second sliding ring 22 is close to the middle platform 6. The axial width of the second sliding ring 22 is smaller than the axial width of the first sliding ring 21, and the bottom end face of the first sliding ring 21 protrudes axially from the bottom end face of the second sliding ring 22.

[0047] When the first sliding ring 21 and the second sliding ring 22 slide out from the inside of the inner platform 7, they will push the first rubber barrier membrane 23 to deform toward the road surface until the first sliding ring 21 makes hard contact with the road surface. At this time, the first sliding ring 21 will press against the road surface while working with the first rubber barrier membrane 23 to block the water flow. At this time, the second sliding ring 22 will not stick to the road surface.

[0048] The second grounding assembly includes a third sliding ring 24 and a fourth sliding ring 25. The third sliding ring 24 and the fourth sliding ring 25 are slidably installed inside the outer platform 4. The fourth sliding ring 25 is close to the middle platform 6. The axial width of the fourth sliding ring 25 is smaller than the axial width of the third sliding ring 24, and the bottom end face of the third sliding ring 24 protrudes axially from the bottom end face of the fourth sliding ring 25.

[0049] When the third sliding ring 24 and the fourth sliding ring 25 slide out from the inside of the outer platform 4, they will push the second rubber barrier membrane 26 to deform toward the road surface until the third sliding ring 24 makes hard contact with the road surface. At this time, the third sliding ring 24 will press against the road surface while working with the second rubber barrier membrane 26 to block the water flow. At this time, the fourth sliding ring 25 will not stick to the road surface.

[0050] An air chamber 10 is provided inside the middle part of the middle platform 6. A positioning platform 5 is provided at the top of the inner platform 7 and the outer platform 4. A multi-port pipe 9 is provided inside the positioning platform 5 for communication between the air chamber 10 and the outer platform 4 and the inner platform 7.

[0051] The top of the central platform 6 is provided with a first sealing ring 8, and one end of the multi-port pipe 9 passes through the first sealing ring 8 and communicates with the air chamber 10.

[0052] Positioning platform 5 is located above the middle platform 6. Positioning platform 5 has an inverted U-shaped design. One end of positioning platform 5 is fixedly connected to the top of the inner platform 7, and the other end of positioning platform 5 is fixedly connected to the top of the outer platform 4. Multi-port pipe 9 extends into the interior of the outer platform 4 and the interior of the inner platform 7 respectively, and one end of it penetrates the first sealing ring 8 and communicates with the air cavity 10. This allows positioning platform 5 to connect the inner platform 7 and the outer platform 4 with the air cavity 10 without affecting the rotation of the middle platform 6.

[0053] The control assembly includes a delivery cylinder 11, a piston 16, a delivery pipe 13, and a suction pipe 12. The delivery cylinder 11 is slidably installed inside the central platform 6. The delivery pipe 13 and the suction pipe 12 are both installed on the delivery cylinder 11. The other end of the delivery pipe 13 is connected to the air chamber 10, and the other end of the suction pipe 12 is connected to the outside gas. The piston 16 is slidably installed inside the delivery cylinder 11. One-way valves are provided on both the delivery pipe 13 and the suction pipe 12.

[0054] The one-way valve installed on the delivery pipe 13 only allows gas inside the delivery cylinder 11 to enter the interior of the air chamber 10 through the delivery pipe 13, and the one-way valve installed on the suction pipe 12 only allows gas outside to enter the interior of the delivery cylinder 11 through the suction pipe 12.

[0055] By sliding the piston 16 from top to bottom inside the conveying cylinder 11, external gas can be drawn into the conveying cylinder 11 through the suction pipe 12. Then, by sliding the piston 16 from bottom to top inside the conveying cylinder 11, gas can be sent into the gas chamber 10 through the conveying pipe 13. Subsequently, the gas in the gas chamber 10 is sent into the outer platform 4 and the inner platform 7 through the multi-port pipe 9. The air pressure pushes the first sliding ring 21, the second sliding ring 22, the third sliding ring 24 and the fourth sliding ring 25, causing the first rubber barrier 23 and the second rubber barrier 26 to adhere to the road surface, blocking the water path and improving the detection effect.

[0056] A mounting platform 19 is slidably installed at the bottom of the middle platform 6. A transmission rod 17 is rotatably installed inside the mounting platform 19. A reciprocating screw is threadedly connected inside the transmission rod 17. The other end of the reciprocating screw extends into the inside of the conveying cylinder 11 and is fixedly connected to the piston 16. A moving gear 14 is fixedly installed on the outer wall of the transmission rod 17. A gear ring 18 that meshes with the moving gear 14 is fixedly installed inside the middle platform 6.

[0057] A drive motor is fixedly installed on one side of the mounting platform 19, and the output shaft of the drive motor is fixedly connected to a power gear 15 that meshes with the moving gear 14.

[0058] By starting the drive motor, the power gear 15 can be rotated, which in turn drives the moving gear 14 to rotate. With the cooperation of the gear ring 18, the moving gear 14 drives the mounting platform 19 to slide circumferentially inside the middle platform 6. At the same time, the rotation of the moving gear 14 also drives the transmission rod 17 to rotate, causing the reciprocating screw inside to drive the piston 16 to slide up and down inside the delivery pipe 13. In conjunction with the delivery pipe 13 and the suction pipe 12, external gas is drawn into the delivery cylinder 11 and sent into the air chamber 10 through the delivery pipe 13. Then, the gas in the air chamber 10 is sent into the outer platform 4 and the inner platform 7 through the multi-port pipe 9. The air pressure pushes the first sliding ring 21, the second sliding ring 22, the third sliding ring 24 and the fourth sliding ring 25, causing the first rubber barrier 23 and the second rubber barrier 26 to adhere to the road surface and block the water path, thereby improving the detection effect.

[0059] The extrusion assembly includes an extrusion plate 20, a mounting block 31, a diversion pipe 30, a baffle ball 27, a control gear 28, and a toothed plate;

[0060] The mounting block 31 is detachably connected to the receiving ring 32. The diversion pipe 30 is slidably installed inside the mounting block 31. The diversion pipe 30 is connected to the outer platform 4 through the second sealing ring 29. The control gear 28 is fixedly connected to the balloon 27. The toothed plate is fixedly installed inside the mounting block 31.

[0061] The receiving ring 32 and the mounting block 31 are connected by a common snap-fit ​​structure. The sealant inside the receiving ring 32 can be disassembled and replenished after it is used up, or the receiving ring 32 can be replaced with a disposable consumable for easy replacement later. The bottom of the receiving ring 32 is set with a pressure nozzle. Only when a certain pressure is applied can the sealant inside the receiving ring 32 be squeezed out.

[0062] When the mounting platform 19 rotates, it will simultaneously drive the receiving ring 32 to rotate, which can fill the gap between the first rubber barrier 23 and the second rubber barrier 26 while rotating. At the same time, the second sealing ring 29 can maintain communication with the outer platform 4 while the diversion pipe 30 moves.

[0063] There are two extrusion assemblies, which are symmetrically arranged on the top of the receiving ring 32;

[0064] Through-holes are provided on the first sliding ring 21, the second sliding ring 22, the third sliding ring 24, and the fourth sliding ring 25.

[0065] Both of the two branch pipes 30 in the two extrusion assemblies are connected to the inner cavities of the outer platform 4 and the inner platform 7 through the second sealing ring 29, and both of the mounting blocks 31 are connected to the inner cavity of the receiving ring 32.

[0066] The through-hole allows the gas in the air chamber 10 to pass through the first sliding ring 21, the second sliding ring 22, the third sliding ring 24, and the fourth sliding ring 25, and enter the interior of the first rubber barrier membrane 23 and the second rubber barrier membrane 26, causing it to expand and further adhere to the road surface.

[0067] By shortening the bottom of the second sliding ring 22 and the fourth sliding ring 25, space is provided for the deformation of the first rubber barrier 23 and the second rubber barrier 26. At this time, the first rubber barrier 23 and the second rubber barrier 26 will expand directly downwards towards the receiving ring 32. Under the action of air pressure, they will further fill the potholes on the road surface and push the receiving ring 32 upwards. The receiving ring 32 will drive the mounting block 31 to overcome gravity and move upwards. With the cooperation of the toothed plate and the control gear 28, the blocking balloon 27 will rotate. The two diversion pipes 30 are respectively connected to the gas entering the outer platform 4 and the inner platform 7. At this time, the gas enters the interior of the receiving ring 32 and pushes the extrusion plate 20, thereby squeezing out the sealant inside the receiving ring 32 and filling and sealing the gap between the first rubber barrier 23 and the second rubber barrier 26, thus achieving the effect of blocking the water passage.

[0068] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0069] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A municipal road surface permeability testing device, comprising a base (1), a measuring part (3), and a measuring cylinder (2); characterized in that The base (1) is fixedly installed with an outer platform (4) and an inner platform (7). The bottom of the inner platform (7) is provided with a first rubber barrier membrane (23), and the bottom of the outer platform (4) is provided with a second rubber barrier membrane (26). The inner platform (7) is provided with a first grounding component, and the outer platform (4) is provided with a second grounding component. Both the first grounding component and the second grounding component deform the first rubber barrier film (23) and the second rubber barrier film (26) by moving towards the ground and covering the ground. A middle platform (6) is provided between the outer platform (4) and the inner platform (7). The inner cavity below the middle part of the middle platform (6) is hollow and open, and a control component is slidably installed inside. By sliding inside the middle platform (6), the first grounding component and the second grounding component are driven to deform the first rubber barrier film (23) and the second rubber barrier film (26). Below the central platform (6), there is a receiving ring (32) for storing sealant. An extrusion plate (20) is slidably installed inside the receiving ring (32). An extrusion assembly is provided inside the receiving ring (32) to extrude liquid sealant to fill the gap between the road surface and the first rubber barrier membrane (23) and the second rubber barrier membrane (26) and form a temporary sealing layer.

2. The municipal pavement permeability detection device according to claim 1, characterized in that: The first grounding component includes a first sliding ring (21) and a second sliding ring (22). The first sliding ring (21) and the second sliding ring (22) are both slidably installed inside the inner platform (7). The second sliding ring (22) is close to the middle platform (6). The axial width of the second sliding ring (22) is smaller than the axial width of the first sliding ring (21), and the bottom end face of the first sliding ring (21) protrudes axially from the bottom end face of the second sliding ring (22).

3. The municipal pavement permeability detection device according to claim 2, characterized in that: The second grounding assembly includes a third sliding ring (24) and a fourth sliding ring (25). The third sliding ring (24) and the fourth sliding ring (25) are slidably installed inside the outer platform (4). The fourth sliding ring (25) is close to the middle platform (6). The axial width of the fourth sliding ring (25) is smaller than the axial width of the third sliding ring (24), and the bottom end face of the third sliding ring (24) protrudes axially from the bottom end face of the fourth sliding ring (25).

4. The municipal pavement permeability detection device according to claim 1, characterized in that: An air chamber (10) is provided inside the middle part above the middle of the middle platform (6). A positioning platform (5) is provided at the top of the inner platform (7) and the outer platform (4). A multi-port pipe (9) is provided inside the positioning platform (5) for communication between the air chamber (10) and the outer platform (4) and the inner platform (7). The top of the platform (6) is provided with a first sealing ring (8), and one end of the multi-port pipe (9) passes through the first sealing ring (8) and communicates with the air chamber (10).

5. The municipal pavement permeability detection device according to claim 4, characterized in that: The control assembly includes a delivery cylinder (11), a piston (16), a delivery pipe (13), and a suction pipe (12). The delivery cylinder (11) is slidably installed inside the central platform (6). The delivery pipe (13) and the suction pipe (12) are both installed on the delivery cylinder (11). The other end of the delivery pipe (13) is connected to the air chamber (10), and the other end of the suction pipe (12) is connected to the outside gas. The piston (16) is slidably installed inside the delivery cylinder (11). One-way valves are provided on both the delivery pipe (13) and the suction pipe (12).

6. The municipal pavement permeability detection device according to claim 5, characterized in that: A mounting platform (19) is slidably installed at the bottom of the central platform (6). A transmission rod (17) is rotatably installed inside the mounting platform (19). A reciprocating screw is threadedly connected inside the transmission rod (17). The other end of the reciprocating screw extends into the interior of the conveying cylinder (11) and is fixedly connected to the piston (16). A moving gear (14) is fixedly installed on the outer wall of the transmission rod (17). A gear ring (18) that meshes with the moving gear (14) is fixedly installed inside the central platform (6). A drive motor is fixedly installed on one side of the mounting platform (19), and the output shaft of the drive motor is fixedly connected to a power gear (15) that meshes with the moving gear (14).

7. The municipal pavement permeability detection device according to claim 3, characterized in that: The extrusion assembly includes a mounting block (31), a diverter pipe (30), a baffle ball (27), a control gear (28), and a toothed plate; The mounting block (31) is detachably connected to the receiving ring (32), the diversion pipe (30) is slidably installed inside the mounting block (31), the diversion pipe (30) is connected to the outer platform (4) through the second sealing ring (29), the control gear (28) is fixedly connected to the blocking balloon (27), and the toothed plate is fixedly installed inside the mounting block (31). Two extrusion assemblies are provided, and the two extrusion assemblies are symmetrically arranged on the top of the receiving ring (32); The first sliding ring (21), the second sliding ring (22), the third sliding ring (24) and the fourth sliding ring (25) are all provided with through air holes.

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