Road surface rainwater treatment device and road surface rainwater treatment method for sponge city

Abstract

The invention relates to a pavement rainwater treatment device and a pavement rainwater treatment method for a sponge city. The device is suitable for the technical field of urban rainwater treatment devices. The road surface rainwater treatment device for the sponge city is provided with a water permeable road surface, water permeable holes are formed in the water permeable road surface, the surface of the water permeable road surface is in a slope shape, an overflow groove is formed in the lower end of the slope of the water permeable road surface, a backflow groove is formed in the upper end of the slope of the water permeable road surface, and the overflow groove is lower than the backflow groove; the collecting box is arranged below the permeable pavement and used for collecting rainwater leaking from the permeable pavement, and a discharging pipe used for discharging the rainwater is connected to the collecting box; the overflow tank is communicated with the overflow groove through an overflow pipe, a backflow pipe connected with the backflow groove is connected to the bottom of the overflow tank, and a driving mechanism capable of pressing water stored in the overflow tank downwards is arranged in the overflow tank; and the controller is in communication connection with the driving mechanism, and the controller can control the driving mechanism to operate.

Description

Technical Field

[0001] The present invention relates to a road surface rainwater treatment device and a road surface rainwater treatment method for a sponge city, and is applicable to the technical field of urban rainwater treatment devices. Background Art

[0002] With the progress of urbanization, the environmental construction of cities has gradually been taken seriously by people. In recent years, a water resource management strategy and method has been proposed, which is a new generation of urban rain and flood management concept, known as a sponge city. It means that a city can be like a sponge and has good elasticity in adapting to environmental changes and coping with natural disasters brought by rainwater. It is one of the construction goals of today's cities. During the construction of a sponge city, it is necessary to consider the collection, treatment, and discharge of rain and flood in all aspects. For example, during the treatment of rainwater, it is necessary to filter the debris in the rainwater to prevent a large amount of food residues or animal carcasses from being carried by the rainwater into the river, resulting in eutrophication of the river and causing water pollution. Therefore, a rainwater purification device is used to centrally treat the rainwater. Traditional rainwater purification devices use low-lying reservoirs to collect the rainwater in the city and then introduce it into the purification device through a diversion method. Traditional purification devices usually consist of a filter screen, a support frame, a diversion pipe, and a main frame. This kind of purification device has a simple structure, is easy to use, and the manufacturing cost is relatively low. It is currently the most widely used sponge city rainwater purification device. However, in actual applications, the road surface of a sponge city is usually made of a permeable material. The permeable road surface itself has a porous structure and can play a role in purifying rainwater. Therefore, using the permeable road surface of a sponge city itself as a part of rainwater purification has become a research direction. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: To solve the above technical problems, the present invention provides a road surface rainwater treatment device and a road surface rainwater treatment method for a sponge city.

[0004] The technical solution adopted by the present invention is: A road surface rainwater treatment device for a sponge city has:

[0005] A permeable road surface, the permeable road surface is provided with permeable holes, the surface of the permeable road surface is in a slope shape, an overflow trough is arranged at the lower end of the slope of the permeable road surface, a return trough is arranged at the upper end of the slope of the permeable road surface, and the overflow trough is lower than the return trough;

[0006] A collection box, arranged at a position below the permeable road surface, for collecting the rainwater seeping from the permeable road surface, and a discharge pipe for discharging the rainwater is connected to the collection box;

[0007] An overflow water tank, the overflow water tank is communicated with the overflow trough through an overflow pipe, a return pipe connected to the return trough is connected to the bottom of the overflow water tank, and a driving mechanism capable of pressing the water stored in the overflow water tank downward is arranged in the overflow water tank;

[0008] A controller, which is communicatively connected to the driving mechanism, and the controller can control the operation of the driving mechanism.

[0009] The driving mechanism has a first screw rod installed on the top cover of the overflow water tank in the vertical direction. A piston plate threadedly engaged with the first screw rod is installed on the first screw rod extending into the overflow water tank. The piston plate contacts the side wall of the overflow water tank. A first guide rail arranged in the vertical direction is arranged on the side wall of the overflow water tank. A first guide groove slidably engaged with the first guide rail is arranged on the piston plate. The first screw rod extending out of the overflow water tank is connected to the output shaft of a motor installed on the overflow water tank, and the motor is communicatively connected to the controller.

[0010] A backwashing mechanism is arranged in the collection box. The backwashing mechanism has a second screw rod arranged horizontally in the collection box. The second screw rod is driven to rotate by a transmission mechanism. A second guide rail arranged along the length direction of the second screw rod is arranged in the collection box. A backwashing groove with an upward opening is arranged in the collection box. The backwashing groove is threadedly engaged with the second screw rod and slidably engaged with the second guide rail. A backwashing pipe is connected to the backwashing groove, and the end of the backwashing pipe extends into the overflow water tank and is installed at the upper end of the piston plate.

[0011] The end of the second screw rod extends out of the collection box and into the overflow water tank. The transmission mechanism has a driven bevel gear installed at the end of the second screw rod. A driven gear threadedly engaged with the first screw rod and a driving bevel gear are respectively installed at the upper and lower ends of the top cover of the overflow water tank. The driven gear and the driving bevel gear are fixedly connected. A driving gear is installed on the output shaft of the motor installed on the overflow water tank. The driving gear is engaged with the driven gear, and the driving bevel gear is engaged with the driven bevel gear.

[0012] A backwashing valve is installed on the backwashing pipe, and the backwashing valve is communicatively connected to the controller.

[0013] An overflow valve is installed on the overflow pipe, and the overflow valve is communicatively connected to the controller.

[0014] A reflux valve is installed on the reflux pipe, and the reflux valve is communicatively connected to the controller.

[0015] A method for treating road surface rainwater in a sponge city, which applies the above-mentioned device for treating road surface rainwater in a sponge city, is characterized in that:

[0016] When it rains, raindrops fall on the permeable road surface. The rainwater is filtered through the permeable holes on the permeable road surface and then falls into the collection box and is discharged through the discharge pipe. The controller controls the backwashing valve, the overflow valve, and the reflux valve to close;

[0017] When the rainfall increases, affected by the infiltration efficiency of the permeable holes and the discharge efficiency of the discharge pipe, the water level on the permeable pavement rises to the position of the overflow trough. The controller controls the opening of the overflow valve, allowing the excess rainwater on the permeable pavement to flow into the overflow tank and precipitate in the overflow tank.

[0018] When the rainfall decreases, the water level on the permeable pavement drops. The controller controls the closing of the overflow valve, the opening of the backwash valve and the reflux valve, and controls the operation of the motor. The motor drives the piston plate to move downward and compress the rainwater in the overflow tank. The impurities precipitated at the bottom of the overflow tank flow back to the permeable pavement along with the rainwater through the reflux pipe and the reflux trough. After being filtered by the permeable pavement, the rainwater is discharged through the discharge pipe. The clarified rainwater after precipitation under the piston plate flushes the permeable pavement from bottom to top through the backwash pipe and the backwash trough to clean the permeable pavement. When the motor drives the first screw to rotate, it drives the second screw to rotate under the action of the transmission mechanism, causing the backwash trough to move in the collection box to backwash the permeable pavement.

[0019] After the controller controls the motor to operate and drive the piston plate to move to the bottom position of the overflow tank, the rainwater in the overflow tank is discharged. The controller controls the motor to run in reverse to achieve reset, and controls the closing of the backwash valve, the overflow valve and the reflux valve.

[0020] The beneficial effects of the present invention are as follows:

[0021] Self-cleaning function: Through the up and down movement of the piston plate in the overflow tank, combined with the action of the backwash trough and the backwash pipe, it can reverse flush the permeable pavement, effectively remove the sediment in the porous structure, maintain the permeable performance, and reduce the artificial maintenance cost.

[0022] Efficient sedimentation treatment: When the rainfall is large, a part of the rainwater will directly enter the overflow tank. After precipitation in the overflow tank, the sediment can be brought back above the permeable pavement through the reflux pipe for filtration, preventing impurities from entering the sewage system and protecting the water quality.

[0023] Resource recycling: The clarified rainwater is reused to clean the permeable pavement through the backwash process, realizing the recycling of water resources, conforming to the construction concept of sponge city, and improving the utilization rate of water resources.

[0024] Automated operation: The controller controls the motor to drive the operation of the whole system, including the lifting of the piston plate, the reciprocating movement of the backwash trough, etc., realizing an automated rainwater purification process without manual intervention, improving the reliability and convenience of the system.

[0025] Optimized space utilization: This device integrates traditional functions such as rainwater collection, sedimentation, filtration and backwashing, reduces the number of required devices, optimizes the space layout, and makes it more suitable for application in urban environments.

[0026] Strong adaptability: The design takes into account different rainfall intensities. It can ensure the effective infiltration of rainwater during light rain and relieve the surface runoff pressure through the overflow system during heavy rain, enhancing the system's ability to cope with various weather conditions.

[0027] Prolong the lifespan of the facilities: Regular self-cleaning can effectively delay the problem of clogging of permeable bricks, thereby extending their service life and reducing long-term operating costs. Description of the drawings

[0028] Figure 1 、 2 Figures 3 and 4: Schematic structural diagrams of the present invention.

[0029] Figure 5 、 6 Figures 7 and 8: Exploded structural diagrams of the present invention.

[0030] Figure 9 : Block diagram of the controller connection of the present invention.

[0031] In the figures: 1, permeable road surface; 1-1, permeable holes; 1-2, overflow trough; 1-3, return trough; 2, collection tank; 2-1, discharge pipe; 3, overflow tank; 3-1, overflow pipe; 3-2, return pipe; 3-3, return valve; 3-4, top cover; 3-5, overflow valve; 4, driving mechanism; 4-1, first screw; 4-2, piston plate; 4-3, first guide rail; 4-4, motor; 5, backwashing mechanism; 5-1, second screw; 5-2, second guide rail; 5-3, backwashing trough; 5-4, backwashing pipe; 5-5, backwashing valve; 6, transmission mechanism; 6-1, driven bevel gear; 6-2, driving bevel gear; 6-3, driven gear; 6-4, driving gear; 7, controller. Detailed implementation manners

[0032] The present invention will be further described in detail below in conjunction with the drawings and through embodiments. The following embodiments are explanations of the present invention and the present invention is not limited to the following embodiments.

[0033] Embodiment 1 is a rainwater treatment device for the road surface of a sponge city, having:

[0034] A permeable road surface 1, the permeable road surface 1 is provided with permeable holes 1-1, the surface of the permeable road surface 1 is in a slope shape, an overflow trough 1-2 is arranged at the lower end of the slope of the permeable road surface 1, a return trough 1-3 is arranged at the upper end of the slope of the permeable road surface 1, and the overflow trough 1-2 is lower than the return trough 1-3;

[0035] A collection tank 2, arranged at a position below the permeable road surface 1, for collecting the rainwater seeping from the permeable road surface 1, and a discharge pipe 2-1 for discharging the rainwater is connected to the collection tank 2;

[0036] Overflow water tank 3, the overflow water tank 3 is communicated with the overflow tank 1-2 through an overflow pipe 3-1. A return pipe 3-2 connected to the return tank 1-3 is connected to the bottom of the overflow water tank 3. A driving mechanism 4 capable of pressing the stored water in the overflow water tank 3 downward is arranged in the overflow water tank 3;

[0037] Controller 7, the controller 7 is communicatively connected to the driving mechanism 4, and the controller 7 can control the operation of the driving mechanism 4. Thus, when the rainfall is small, the rainwater penetrates through the permeable pavement 1 and finally is discharged into the drainage system through the discharge pipe 2-1 after being filtered by the permeable pavement 1 and collected in the lower collecting tank 2; when the rainfall is large and the water filtration efficiency of the permeable pavement 1 is insufficient to filter the rainwater, the water level on the permeable pavement 1 rises until it reaches the overflow tank 1-2. Part of the rainwater is collected in the overflow water tank 3 through the overflow tank 1-2. After the rainfall is small or the rainfall stops, the water level on the permeable pavement 1 drops. The controller 7 controls the operation of the driving mechanism 4 to press the stored water in the overflow water tank 3 downward and return it to the permeable pavement 1 through the return pipe 3-2 and the return tank 1-3. The permeable pavement 1 filters the rainwater collected in the overflow water tank 3.

[0038] Embodiment 2 is a road surface rainwater treatment device for a sponge city. On the basis of Embodiment 1, in this embodiment, the driving mechanism 4 has a first screw rod 4-1 installed on the top cover 3-4 of the overflow water tank 3 in the vertical direction. A piston plate 4-2 threadedly engaged with the first screw rod 4-1 is installed on the first screw rod 4-1 extending into the overflow water tank 3. The piston plate 4-2 is in contact with the side wall of the overflow water tank 3. A first guide rail 4-3 arranged in the vertical direction is arranged on the side wall of the overflow water tank 3. A first guide groove slidably engaged with the first guide rail 4-3 is arranged on the piston plate 4-2. The first screw rod 4-1 extending out of the overflow water tank 3 is connected to the output shaft of a motor 4-4 installed on the overflow water tank 3. The motor 4-4 is communicatively connected to the controller 7. Thus, when the controller 7 controls the operation of the motor 4-4, it can drive the first screw rod 4-1 to rotate. Under the action of the threaded engagement between the piston plate 4-2 and the first screw rod 4-1 and the sliding engagement between the piston plate 4-2 and the first guide rail 4-3, the piston plate 4-2 can be driven to move downward, so as to press the stored water in the overflow water tank 3 into the return pipe 3-2; when the controller 7 controls the motor 4-4 to run reversely, the piston plate 4-2 can be driven to move upward and reset.

[0039] Embodiment 3 is a road surface rainwater treatment device for a sponge city. On the basis of Embodiment 2, in this embodiment, a backwashing mechanism 5 is arranged in the collection tank 2. The backwashing mechanism 5 has a second screw rod 5-1 arranged horizontally in the collection tank 2. The second screw rod 5-1 is driven to rotate by a transmission mechanism 6. In the collection tank 2, a second guide rail 5-2 is arranged along the length direction of the second screw rod 5-1. A backwashing groove 5-3 with an upward opening is arranged in the collection tank 2. The backwashing groove 5-3 is in threaded cooperation with the second screw rod 5-1 and is in sliding cooperation with the second guide rail 5-2. A backwashing pipe 5-4 is connected to the backwashing groove 5-3. The end of the backwashing pipe 5-4 extends into the overflow water tank 3 and is installed at the upper end of the piston plate 4-2.

[0040] The end of the second screw rod 5-1 extends out of the collection tank 2 and into the overflow water tank 3. The transmission mechanism 6 has a driven bevel gear 6-1 installed at the end of the second screw rod 5-1. A driven gear 6-3 and a driving bevel gear 6-2 that are in threaded cooperation with the first screw rod 4-1 are respectively installed at the upper and lower ends of the top cover 3-4 of the overflow water tank 3. The driven gear 6-3 and the driving bevel gear 6-2 are fixedly connected. A driving gear 6-4 is installed on the output shaft of the motor 4-4 installed on the overflow water tank 3. The driving gear 6-4 is meshed with the driven gear 6-3. The driving bevel gear 6-2 is meshed with the driven bevel gear 6-1.

[0041] In this way, when the motor 4-4 drives the driving gear 6-4 to rotate, the driven gear 6-3 and the driving bevel gear 6-2 are driven to rotate under the action of gear meshing. Under the limiting action of the top cover 3-4 of the overflow water tank 3, the driving screw rod rotates, so that the piston plate 4-2 moves. And under the meshing action of the driving bevel gear 6-2 and the driven bevel gear 6-1, the second screw rod 5-1 is driven to rotate. Under the action of the threaded cooperation between the backwashing groove 5-3 and the second screw rod 5-1 and the sliding cooperation between the backwashing groove 5-3 and the second guide rail 5-2, the backwashing groove 5-3 can be driven to move along with the piston plate 4-2. When the piston plate 4-2 moves downward and squeezes the water stored in the overflow water tank 3, the water stored in the overflow water tank 3 flows into the backwashing groove 5-3 through the backwashing pipe 5-4 and sprays upward to the permeable road surface 1 to wash the permeable holes 1-1 on the permeable road surface 1.

[0042] Embodiment 4 is a road surface rainwater treatment device for a sponge city. On the basis of Embodiment 3, in this embodiment, a backwash valve 5-5 is installed on the backwash pipe 5-4, and the backwash valve 5-5 is communicatively connected to the controller 7. An overflow valve 3-5 is installed on the overflow pipe 3-1, and the overflow valve 3-5 is communicatively connected to the controller 7. A reflux valve 3-3 is installed on the reflux pipe 3-2, and the reflux valve 3-3 is communicatively connected to the controller 7. In this way, when the overflow tank 3 stores water, the controller 7 controls the opening of the overflow valve 3-5 and the closing of the backwash valve 5-5 and the reflux valve 3-3, facilitating the excess rainwater on the permeable road surface 1 to flow into the overflow tank 3 through the overflow groove 1-2 and the overflow pipe 3-1; after the water level on the permeable road surface 1 drops, the controller 7 controls the closing of the overflow valve 3-5 and the opening of the backwash valve 5-5 and the reflux valve 3-3, and then the controller 7 controls the operation of the motor 4-4 to drive the piston plate 4-2 in the overflow tank 3 to move downward and press the water stored in the overflow tank 3 towards the backwash pipe 5-4 and the reflux pipe 3-2. During the downward movement of the piston plate 4-2, more water in the overflow tank 3 flows to the permeable road surface 1 through the reflux groove 1-3, is filtered by the permeable road surface 1 and then discharged from the discharge pipe 2-1. The upper water body that has settled below the piston plate 4-2 in the overflow tank 3 flows towards the backwash pipe 5-4 through the piston plate 4-2 and flushes the permeable holes 1-1 of the permeable road surface 1 upward through the backwash groove 5-3, alleviating the blockage of the permeable holes 1-1. During the downward movement of the piston plate 4-2, the collection box 2 in the backwash groove 5-3 moves. When the piston plate 4-2 moves upward and resets, the backwash groove 5-3 also resets synchronously.

[0043] Embodiment 5 is a road surface rainwater treatment device for a sponge city. In this embodiment, it has:

[0044] A permeable road surface 1, the permeable road surface 1 is provided with permeable holes 1-1, the surface of the permeable road surface 1 is in a slope shape, an overflow groove 1-2 is arranged at the lower end of the slope of the permeable road surface 1, a reflux groove 1-3 is arranged at the upper end of the slope of the permeable road surface 1, and the overflow groove 1-2 is lower than the reflux groove 1-3;

[0045] A collection box 2, arranged at a position below the permeable road surface 1, for collecting the rainwater seeping from the permeable road surface 1, and a discharge pipe 2-1 for discharging the rainwater is connected to the collection box 2;

[0046] An overflow tank 3, the overflow tank 3 is communicated with the overflow groove 1-2 through an overflow pipe 3-1, a reflux pipe 3-2 connected to the reflux groove 1-3 is connected to the bottom of the overflow tank 3, and a driving mechanism 4 capable of pressing the water stored in the overflow tank 3 downward is arranged in the overflow tank 3;

[0047] A controller 7, the controller 7 is communicatively connected to the driving mechanism 4, and the controller 7 can control the operation of the driving mechanism 4.

[0048] The driving mechanism 4 has a first screw rod 4-1 installed vertically on the top cover 3-4 of the overflow water tank 3. A piston plate 4-2 that is threadedly engaged with the first screw rod 4-1 is installed on the first screw rod 4-1 extending into the overflow water tank 3. The piston plate 4-2 contacts the side wall of the overflow water tank 3. A first guide rail 4-3 arranged vertically is disposed on the side wall of the overflow water tank 3. A first guide groove that is slidably engaged with the first guide rail 4-3 is provided on the piston plate 4-2. The first screw rod 4-1 extending outside the overflow water tank 3 is connected to the output shaft of a motor 4-4 installed on the overflow water tank 3. The motor 4-4 is communicatively connected to the controller 7.

[0049] A backwashing mechanism 5 is arranged in the collection tank 2. The backwashing mechanism 5 has a second screw rod 5-1 arranged horizontally in the collection tank 2. The second screw rod 5-1 is driven to rotate by a transmission mechanism 6. A second guide rail 5-2 arranged along the length direction of the second screw rod 5-1 is disposed in the collection tank 2. A backwashing groove 5-3 with an upward opening is provided in the collection tank 2. The backwashing groove 5-3 is threadedly engaged with the second screw rod 5-1 and is slidably engaged with the second guide rail 5-2. A backwashing pipe 5-4 is connected to the backwashing groove 5-3. The end of the backwashing pipe 5-4 extends into the overflow water tank 3 and is installed at the upper end of the piston plate 4-2.

[0050] The end of the second screw rod 5-1 extends outside the collection tank 2 and into the overflow water tank 3. The transmission mechanism 6 has a driven bevel gear 6-1 installed at the end of the second screw rod 5-1. A driven gear 6-3 and a driving bevel gear 6-2 that are threadedly engaged with the first screw rod 4-1 are respectively installed at the upper and lower ends of the top cover 3-4 of the overflow water tank 3. The driven gear 6-3 and the driving bevel gear 6-2 are fixedly connected. A driving gear 6-4 is installed on the output shaft of the motor 4-4 installed on the overflow water tank 3. The driving gear 6-4 is meshed with the driven gear 6-3. The driving bevel gear 6-2 is meshed with the driven bevel gear 6-1.

[0051] A backwashing valve 5-5 is installed on the backwashing pipe 5-4. The backwashing valve 5-5 is communicatively connected to the controller 7.

[0052] An overflow valve 3-5 is installed on the overflow pipe 3-1. The overflow valve 3-5 is communicatively connected to the controller 7.

[0053] A reflux valve 3-3 is installed on the reflux pipe 3-2. The reflux valve 3-3 is communicatively connected to the controller 7.

[0054] The treatment method of this embodiment is as follows:

[0055] When it rains, raindrops fall on the permeable pavement 1. The rainwater passes through the permeable holes 1-1 on the permeable pavement 1, is filtered, and then falls into the collection tank 2, and is discharged through the discharge pipe 2-1. The controller 7 controls the backwashing valve 5-5, the overflow valve 3-5, and the reflux valve 3-3 to close.

[0056] When the rainfall increases, affected by the seepage efficiency of the water-permeable holes 1-1 and the discharge efficiency of the discharge pipe 2-1, the water level on the permeable pavement 1 rises to the position of the overflow trough 1-2. The controller 7 controls the opening of the overflow valve 3-5, so that the excess rainwater on the permeable pavement 1 flows into the overflow water tank 3 and precipitates in the overflow water tank 3;

[0057] When the rainfall decreases, the water level on the permeable pavement 1 drops. The controller 7 controls the closing of the overflow valve 3-5, the opening of the backwash valve 5-5 and the reflux valve 3-3, and the controller 7 controls the operation of the motor 4-4 to drive the piston plate 4-2 to move downward and compress the rainwater in the overflow water tank 3. The impurities precipitated at the bottom of the overflow water tank 3 flow back to the permeable pavement 1 along with the rainwater through the return pipe 3-2 and the return trough 1-3. After being filtered by the permeable pavement 1, the rainwater is discharged from the discharge pipe 2-1. The clarified rainwater after precipitation below the piston plate 4-2 flushes the permeable pavement 1 from bottom to top through the backwash pipe 5-4 and the backwash trough 5-3 to clean the permeable pavement 1. When the motor 4-4 drives the first screw 4-1 to rotate, under the action of the transmission mechanism 6, the second screw 5-1 is driven to rotate, so that the backwash trough 5-3 moves in the collection box 2 to backwash the permeable pavement 1;

[0058] After the controller 7 controls the motor 4-4 to operate and drive the piston plate 4-2 to move to the bottom position of the overflow water tank 3, the rainwater in the overflow water tank 3 is discharged. The controller 7 controls the motor 4-4 to run in the reverse direction to achieve reset, and the controller 7 controls the closing of the backwash valve 5-5, the overflow valve 3-5 and the reflux valve 3-3.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A road surface rainwater treatment device for a sponge city, characterized in that: comprising: a permeable road surface (1) which is provided with permeable holes (1-1), the surface of the permeable road surface (1) is sloped, an overflow trough (1-2) is arranged at the lower end of the slope of the permeable road surface (1), a return trough (1-3) is arranged at the upper end of the slope of the permeable road surface (1), and the overflow trough (1-2) is lower than the return trough (1-3); a collection box (2) which is arranged at a position below the permeable road surface (1) and is used for collecting rainwater leaking from the permeable road surface (1), and a discharge pipe (2-1) for discharging the rainwater is connected to the collection box (2); an overflow water tank (3) which is communicated with the overflow trough (1-2) through an overflow pipe (3-1), a return pipe (3-2) connected to the return trough (1-3) is connected to the bottom of the overflow water tank (3), and a driving mechanism (4) capable of pressing the stored water in the overflow water tank (3) downward is arranged in the overflow water tank (3); a controller (7) which is communicatively connected to the driving mechanism (4) and can control the operation of the driving mechanism (4).

2. The pavement rainwater treatment device for a sponge city according to claim 1, characterized in that: The driving mechanism (4) has a first screw rod (4-1) installed on the top cover (3-4) of the overflow water tank (3) in the vertical direction, a piston plate (4-2) threadedly engaged with the first screw rod (4-1) is installed on the first screw rod (4-1) extending into the overflow water tank (3), the piston plate (4-2) contacts the side wall of the overflow water tank (3), a first guide rail (4-3) arranged in the vertical direction is arranged on the side wall of the overflow water tank (3), a first guide groove slidably engaged with the first guide rail (4-3) is arranged on the piston plate (4-2), the first screw rod (4-1) extending out of the overflow water tank (3) is connected to the output shaft of a motor (4-4) installed on the overflow water tank (3), and the motor (4-4) is communicatively connected to the controller (7).

3. The pavement rainwater treatment device for a sponge city according to claim 2, characterized in that: A backwashing mechanism (5) is arranged in the collection box (2). The backwashing mechanism (5) has a second screw rod (5-1) arranged horizontally in the collection box (2), the second screw rod (5-1) is driven to rotate by a transmission mechanism (6), a second guide rail (5-2) arranged along the length direction of the second screw rod (5-1) is arranged in the collection box (2), a backwashing groove (5-3) with an upward opening is arranged in the collection box (2), the backwashing groove (5-3) is threadedly engaged with the second screw rod (5-1), the backwashing groove (5-3) is slidably engaged with the second guide rail (5-2), a backwashing pipe (5-4) is connected to the backwashing groove (5-3), and the end of the backwashing pipe (5-4) extends into the overflow water tank (3) and is installed at the upper end of the piston plate (4-2).

4. The road surface rainwater treatment device of a sponge city according to claim 3, characterized in that: The end of the second screw rod (5-1) extends outside the collection box (2) and extends into the overflow water tank (3). The transmission mechanism (6) has a driven bevel gear (6-1) installed at the end of the second screw rod (5-1). At the upper and lower ends of the top cover (3-4) of the overflow water tank (3), a driven gear (6-3) and a driving bevel gear (6-2) that are threadedly engaged with the first screw rod (4-1) are respectively installed. The driven gear (6-3) and the driving bevel gear (6-2) are fixedly connected. A driving gear (6-4) is installed on the output shaft of the motor (4-4) installed on the overflow water tank (3). The driving gear (6-4) is engaged with the driven gear (6-3), and the driving bevel gear (6-2) is engaged with the driven bevel gear (6-1).

5. The pavement rainwater treatment device of a sponge city according to claim 3, characterized in that: A backflush valve (5-5) is installed on the backflush pipe (5-4). The backflush valve (5-5) is communicatively connected to the controller (7).

6. The road surface rainwater treatment device for a sponge city according to claim 1, characterized in that: An overflow valve 6-6 is installed on the overflow pipe (3-1). The overflow valve 6-6 is communicatively connected to the controller (7).

7. The pavement rainwater treatment device for a sponge city according to claim 1, characterized in that: A reflux valve (3-3) is installed on the reflux pipe (3-2). The reflux valve (3-3) is communicatively connected to the controller (7).

8. A method for treating road surface rainwater in a sponge city, applying the road surface rainwater treatment device of any one of the above claims 1 to 7, characterized in that: When it rains, raindrops fall on the permeable road surface (1). The rainwater passes through the permeable holes (1-1) on the permeable road surface (1), is filtered and then falls into the collection box (2), and is discharged through the discharge pipe (2-1). The controller (7) controls the backflush valve (5-5), the overflow valve (3-5), and the reflux valve (3-3) to close; When the rainfall increases, affected by the infiltration efficiency of the permeable holes (1-1) and the discharge efficiency of the discharge pipe (2-1), the water level on the permeable road surface (1) rises to the position of the overflow trough (1-2). The controller (7) controls the overflow valve (3-5) to open, so that the excess rainwater on the permeable road surface (1) flows into the overflow water tank (3) and precipitates in the overflow water tank (3); When the rainfall decreases, the water level on the permeable road surface (1) drops. The controller (7) controls the overflow valve (3-5) to close, controls the backflush valve (5-5) and the reflux valve (3-3) to open, and controls the motor (4-4) to operate by the controller (7). The motor drives the piston plate (4-2) to move downward and compress the rainwater in the overflow water tank (3). The impurities precipitated at the bottom of the overflow water tank (3) flow back to the permeable road surface (1) along with the rainwater through the reflux pipe (3-2) and the reflux trough (1-3). After being filtered by the permeable road surface (1), the rainwater is discharged through the discharge pipe (2-1). The clarified rainwater after precipitation below the piston plate (4-2) flushes the permeable road surface (1) from bottom to top through the backflush pipe (5-4) and the backflush trough (5-3) to clean the permeable road surface (1). When the motor (4-4) drives the first screw rod (4-1) to rotate, the second screw rod (5-1) is driven to rotate under the action of the transmission mechanism (6), so that the backflush trough (5-3) moves in the collection box (2) to backflush the permeable road surface (1); After the controller (7) controls the motor (4-4) to operate and drive the piston plate (4-2) to move to the bottom position of the overflow water tank (3), the rainwater in the overflow water tank (3) is discharged. The controller (7) controls the motor (4-4) to run in the reverse direction to achieve reset, and controls the backflush valve (5-5), the overflow valve (3-5), and the reflux valve (3-3) to close.

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