Methods for collecting rainwater from roads in sponge cities

Abstract

This invention discloses a method for collecting rainwater from roads in a sponge city, comprising: rainwater entering a filter cylinder through an inlet pipe; the filtered rainwater being diverted and slowed down by a diversion component on a guide pipe before flowing into a gravel filter layer below; after secondary filtration by the gravel filter layer, the rainwater is stored in a storage tank; a control valve is installed at the bottom of the filter cylinder; opening the control valve allows rainwater to flush the filter cylinder and flush impurities into a sewage discharge unit. This invention filters rainwater by installing a filter cylinder within the ground surface. The filtered rainwater then flows into the storage tank below through a drainage unit. When there are many impurities in the filter cylinder, rainwater can be used to flush it, and wastewater is discharged into the municipal sewage system through a wastewater unit, effectively preventing blockages and improving infiltration performance. Furthermore, the drainage unit of this invention is equipped with a diversion component, which diverts the flow and slows down the flow rate to a certain extent, reducing the impact of rainwater on the gravel filter layer and preventing gravel from entering the storage tank.

Description

Technical Field

[0001] This invention relates to the field of urban rainwater harvesting, and in particular to a method for harvesting rainwater from roads in sponge cities. Background Technology

[0002] With urbanization, effective water storage areas are decreasing, especially with impermeable surfaces like concrete pavements preventing rainwater from seeping into the soil. This leads to difficulties in water treatment during the flood season and water shortages, even during the non-flood season, due to limited effective soil contact area and soil water retention capacity. Existing water storage mainly relies on reservoirs, but surface resources are limited and their water storage capacity is small. To avoid flooding and effectively collect rainwater, the concept of "sponge city" emerged.

[0003] A sponge city refers to a city that possesses excellent "elasticity" in adapting to environmental changes and responding to natural disasters caused by rainwater. It can also be called a "water-resilient city." The construction concept of a sponge city emphasizes absorbing, storing, infiltrating, and purifying rainwater during rainfall, and releasing and utilizing the stored water when needed. Traditional sponge cities involve installing overflow pipes and reservoirs on the surface. When it rains, rainwater flows through the overflow pipes into the reservoir to achieve flood prevention. The reservoir is then connected to a lake or municipal water system, discharging the filtered rainwater into the system. However, when rainwater enters the reservoir through the overflow pipes, it easily carries a large amount of debris, such as tree branches or plastic pollutants. If this debris directly enters the reservoir, it will inevitably pollute the water source inside.

[0004] Currently, a common practice is to install a filter screen inside the overflow pipe. For example, CN209817034U discloses a water circulation structure for collecting rainwater in sponge city roads, which designs the overflow pipe as a sleeve structure and installs a filter screen inside the outer pipe. However, this structure is prone to clogging of the inner pipe during actual use. On the other hand, due to the high flow rate of rainwater, the filter screen is easily damaged by erosion, increasing costs. Summary of the Invention

[0005] In view of this, the present invention proposes a method for collecting rainwater from roads in sponge cities, which can not only avoid blockages, but also balance the flow rate of filtered rainwater and divert rainwater to a storage tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The method for collecting rainwater from sponge city roads according to the present invention involves setting up a sand and gravel filter layer and a water storage tank below the ground surface, and installing multiple filter units on the ground surface above the sand and gravel filter layer. Each filter unit includes a filter unit, a water collection unit connected to the filter unit, and a sewage discharge unit.

[0008] The filtration unit includes a mounting base and an inlet pipe and a filter cylinder within the mounting base. The inlet pipe is connected to the road surface, and the upper part of the filter cylinder is connected to the inlet pipe. The filter cylinder is inclined from the bottom of the inlet pipe, and the bottom of the filter cylinder has a drain outlet, and its side wall has a drain port. The water collection unit has a guide pipe and a diversion component disposed on the guide pipe. One end of the guide pipe is connected to the drain outlet, and the other end is connected to the sand and gravel filter layer. The sewage discharge unit has a sewage branch connected to the drain outlet and a main sewage pipe connecting the sewage branches together.

[0009] The collection method specifically includes the following: rainwater enters the filter cylinder through the inlet pipe, and the rainwater filtered by the filter cylinder is diverted and slowed down by the diversion component on the guide pipe before flowing into the gravel filter layer below. After secondary filtration by the gravel filter layer, it is stored in the water storage tank; a control valve is installed at the bottom of the filter cylinder. When the control valve is opened, rainwater flushes the filter cylinder and flushes the impurities in the filter cylinder into the sewage discharge unit.

[0010] The beneficial effects are as follows: This invention installs a filter cylinder inside the ground surface to filter rainwater. The rainwater filtered by the filter cylinder flows into the sand and gravel filter layer through the drainage unit, and after secondary filtration, it flows into the water storage tank to achieve the collection of urban rainwater. When there are many impurities in the filter cylinder, rainwater can be used to flush the filter cylinder, and the sewage can be discharged into the municipal sewage system through the wastewater unit, effectively avoiding blockage.

[0011] Preferably, the diversion assembly further includes an upper diversion assembly and a lower diversion assembly disposed on each of the guide pipes. The upper diversion assembly includes an upper connector and a water inlet joint fixed together. The water inlet joint has a water inlet channel, and a first diversion unit is disposed within the water inlet channel. The lower diversion assembly includes a lower connector and a drain joint fixed together. The lower connector is inserted into the upper connector, and the lower connector has a first drain channel communicating with the water inlet channel. The drain joint has a second drain channel communicating with the first drain channel. A second diversion unit is disposed between the first drain channel and the second drain channel. The beneficial effect is that by installing the upper and lower diversion assemblies on the guide pipes connected to each filter unit, the present invention has a diversion function, preventing the sand and gravel in the permeable layer from falling into the water storage tank due to excessively fast rainwater flow, thereby improving the filtration efficiency and collection efficiency of rainwater.

[0012] More preferably, the lower part of the water inlet channel has a stepped structure, the first diversion unit includes a first spring disposed at the lower part of the water inlet channel and a first diversion ball fixed to the top of the first spring; the upper surface of the drain connector has a groove communicating with the first drain channel, and the second diversion unit includes a second spring disposed in the groove and a second diversion ball fixed to the top of the second spring.

[0013] Preferably, the mounting base opposite the filter cartridge has a mounting groove. The filter unit further includes a balancing pipe connected to the drain outlet and a balancing unit disposed in the mounting groove. The balancing unit includes a mounting plate, a water collection tank fixed on the mounting plate, and a movable baffle movably disposed on the other side of the water collection tank. The movable baffle is arranged opposite to the mounting plate and is fixed to the bottom of the groove wall by a third spring. The balancing pipe passes through the mounting plate and extends into the water collection tank. This invention installs a balancing unit between the filter cartridge and the guide pipe, effectively balancing the rainwater flow rate.

[0014] Compared with existing technologies, this invention filters rainwater by installing filter cylinders within the ground surface. The filter cylinders are connected to both a drainage unit and a wastewater unit. Filtered rainwater flows through the drainage unit into a storage tank below. When there are many impurities in the filter cylinders, rainwater can be used to flush them. Wastewater is then discharged into the municipal sewage system through the wastewater unit, effectively preventing blockages and improving infiltration performance. Furthermore, the drainage unit of this invention is equipped with a diversion component, which diverts the flow and slows down the flow rate to some extent, reducing the impact of rainwater on the gravel filter layer and preventing gravel from entering the storage tank. Attached Figure Description

[0015] Figure 1 This is the intended layout of the drainage system in this invention.

[0016] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0017] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0018] Figure 4 This is a schematic diagram showing the connection of the flow guide tube, the upper flow splitter assembly, and the lower flow splitter assembly in this invention. Detailed Implementation

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0020] It should be noted that, in the description of this invention, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figure 1-4 As shown, the sponge city road rainwater collection method of the present invention adopts a special infiltration and drainage system. The infiltration and drainage system includes a gravel filter layer 1, a water storage tank 2, and multiple filter units 3 buried in the ground surface, a drainage unit 4 connected to the filter units 3, and a wastewater unit. The gravel filter layer 1 is a sand and gravel filter layer that can perform secondary filtration of rainwater.

[0023] The filter unit 3 includes a mounting base 3.3 and an inlet pipe 3.1 and a filter cylinder 3.2 inside the mounting base 3.3. The upper part of the filter cylinder 3.2 is connected to the inlet pipe 3.1. The filter cylinder 3.2 is inclined from the bottom of the inlet pipe 3.1. The bottom of the filter cylinder 3.2 has a drain port and a drain outlet on its side wall.

[0024] The wastewater unit has a sewage branch 5 connected to the sewage outlet of each filter unit 3 and a main sewage branch connecting the sewage branches 5 together; the drainage unit 4 has a guide pipe 4.1 connected to the drainage outlet of each filter unit 3, the lower end of the guide pipe 4.1 is located inside the gravel filter layer 1, so that the filtered rainwater enters the water storage tank 2 after secondary filtration through the gravel filter layer 1, realizing rainwater collection. In this invention, a filter cylinder 3.2 is installed on the upper part of the ground to filter rainwater; the filter cylinder 3.2 is connected to the drainage unit 4 and the wastewater unit respectively. The filtered rainwater enters the water storage tank 2 below through the drainage unit 4. When there are many impurities in the filter cylinder 3.2, rainwater can be used to flush the filter cylinder 3.2, and the wastewater is discharged into the municipal sewage system through the wastewater unit, effectively avoiding blockage and further ensuring the infiltration performance of the infiltration system.

[0025] Combination Figure 1It is known that the top of the mounting base 3.3 has a water inlet, which is connected to a cover plate 3.4 with holes. The cover plate 3.4 is connected to the water inlet pipe 3.1 to ensure that rainwater can enter the filter cartridge 3.2. The wastewater unit is connected to the municipal sewage system to ensure that impurities can be discharged into the municipal sewage system when rinsing the filter cartridge 3.2.

[0026] The mounting base 3.3, opposite to the filter cartridge 3.2, has a mounting groove 3.5. The filter unit 3 also includes a balance pipe 3.7 connected to the drain outlet and a balance unit disposed in the mounting groove 3.5. The balance unit includes a mounting plate 3.6a, a water collection tank 3.6b fixed on the mounting plate 3.6a, and a movable baffle 3.6c movably disposed on the other side of the water collection tank 3.6b. The movable baffle 3.6c is arranged opposite to the mounting plate 3.6a and is fixed to the bottom of the groove wall of the mounting groove 3.5 by a third spring 3.6d. The movable baffle 3.6c, the mounting plate 3.6a, and the mounting groove 3.5 are spaced apart. The balance pipe 3.7 passes through the mounting plate 3.6a and extends into the water collection tank 3.6b. During rainfall, rainwater on the road enters the inlet pipe 3.1, is filtered by the filter cartridge 3.2, and then enters the water collection tank 3.6b through the balance pipe 3.7. The rainwater washes over the movable baffle 3.6c on one side of the water collection tank 3.6b and opens the movable baffle 3.6c, and then flows into the guide pipe 4.1 through the gap. The water collection tank 3.6b effectively balances the rainwater flow rate.

[0027] Combination Figure 2 It can be seen that the lower part of the mounting base 3.3 is provided with a flow channel 3.8, which is connected to the flow pipe 4.1, so that the filtered rainwater enters the flow pipe 4.1 through the flow channel 3.8.

[0028] Combination Figure 4 It can be seen that each guide pipe 4.1 is equipped with an upper diversion assembly and a lower diversion assembly. The upper diversion assembly includes an upper connector (upper connector 4.2a) and an inlet connector 4.2b that are fixed together. The inlet connector 4.2b has an inlet channel 4.2e. A first diversion unit is provided in the inlet channel 4.2e. The lower part of the inlet channel 4.2e has a stepped structure. The first diversion unit includes a first spring 4.2c provided in the lower part of the inlet channel 4.2e and a first diversion ball 4.2d fixed to the top of the first spring 4.2c. When rainwater passes through the first diversion ball 4.2d, it is diverted and enters the lower diversion assembly below, which has a good diversion effect.

[0029] The lower diversion assembly includes a lower connector (i.e., lower connector 4.3a) and a drain connector 4.3c fixed together. The lower connector 4.3a is inserted into the upper connector 4.2a. The lower connector 4.3a has a first drain channel 4.3b communicating with the water inlet channel 4.2e. The drain connector 4.3c has a second drain channel communicating with the first drain channel 4.3b. A second diversion unit is provided between the first drain channel 4.3b and the second drain channel. The upper surface of the drain connector 4.3c has a groove communicating with the first drain channel 4.3b. The second diversion unit includes a second spring 4.3d disposed in the groove and a second diversion ball 4.3e fixed to the top of the second spring 4.3d. This invention utilizes the first diversion ball 4.2d and the second diversion ball 4.3e to divert rainwater, thereby slowing down the flow rate of rainwater to a certain extent. This effectively prevents the rainwater from flowing too fast and washing away the sand and gravel in the gravel filter layer 1, further preventing the sand and gravel from being washed into the water storage tank 2, thus improving the filtration efficiency and collection efficiency of rainwater.

[0030] In this invention, a control valve is provided at the bottom of the filter cartridge 3.2. During actual operation, the control valve is normally closed; it is opened when drainage is required. For ease of control, an electrically controlled valve is used. The control input terminal of the control valve is electrically connected to the control output terminal of the controller, which controls the opening and closing state of the control valve. It should be noted that the controller in this invention can be a general-purpose processor, a dedicated processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), or a state machine, etc. It can also be a PLC (Programmable Logic Controller), or an industrial control computer, etc.

[0031] The present invention provides a method for collecting rainwater from roads in sponge cities, which specifically includes the following:

[0032] Rainwater from the road surface enters the inlet pipe 3.1 of each filter unit 3, and is guided to the filter cylinder 3.2. After filtration, the rainwater enters the collection tank 3.6b through the balance pipe 3.7. The rainwater washes and opens the movable baffle 3.6c, and then flows from the gap between the mounting groove 3.5 and the collection tank 3.6b to the guide channel 3.8, and then enters the guide pipe 4.1 through the guide channel 3.8. When the rainwater flows through the first and second diversion balls, the flow rate is slowed down, and finally it enters the water storage tank 2 through the gravel filter layer 1, realizing the balanced diversion and collection of rainwater.

[0033] When the filter needs cleaning, open the control valve. Rainwater washes away impurities (such as leaves) inside the filter cartridge 3.2, causing the impurities to flow into the drain branch 5 along with the rainwater. A small portion of the rainwater flows into the balance pipe 3.7, thus cleaning the impurities inside the filter cartridge 3.2. In actual operation, the control valve can be opened periodically to clean the filter cartridge 3.2.

[0034] Finally, it should be emphasized that the above description is merely 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 foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for collecting rainwater of a sponge city road, characterized in that: The collecting method comprises the following steps: setting a sandstone filter layer and a water storage pool under the ground, installing a plurality of filter units in the ground above the sandstone filter layer, a water collecting unit and a sewage unit connected with the filter units; the filter unit comprises a mounting seat, a water inlet pipe and a filter cylinder in the mounting seat; the water inlet pipe is communicated with the road surface; the upper part of the filter cylinder is communicated with the water inlet pipe; the filter cylinder is obliquely arranged from the bottom of the water inlet pipe; the bottom of the filter cylinder is provided with a sewage outlet; and the sidewall of the filter cylinder is provided with a drainage outlet. The water collecting unit is provided with a flow guide pipe and a flow distribution assembly arranged on the flow guide pipe; one end of the flow guide pipe is communicated with the drainage outlet; the other end of the flow guide pipe is communicated with the sandstone filter layer; the sewage unit is provided with a sewage branch communicated with the sewage outlet and a sewage main pipeline connecting the sewage branches; the flow distribution assembly comprises an upper flow distribution assembly and a lower flow distribution assembly arranged on each flow guide pipe; the upper flow distribution assembly comprises an upper connecting piece and a water inlet joint fixed together; the water inlet joint is provided with a water inlet channel; and the water inlet channel is provided with a first flow distribution unit; the lower flow distribution assembly comprises a lower connecting piece and a drainage joint fixed together; the lower connecting piece is inserted into the upper connecting piece; the lower connecting piece is provided with a first drainage channel communicated with the water inlet channel; the drainage joint is provided with a second drainage channel communicated with the first drainage channel; and the first drainage channel and the second drainage channel are provided with a second flow distribution unit. The collecting method specifically comprises the following steps: Rainwater enters the filter cylinder through the water inlet pipe; the rainwater filtered by the filter cylinder is distributed and slowed down by the flow distribution assembly on the flow guide pipe and then flows into the gravel filter layer below; the rainwater is secondarily filtered by the gravel filter layer and then stored in the water storage pool; the bottom of the filter cylinder is provided with a control valve; the rainwater flushes the filter cylinder and the impurities in the filter cylinder are flushed into the sewage unit by opening the control valve.

2. The sponge city road rainwater collecting method according to claim 1, characterized in that: The lower part of the water inlet channel is in a stepped structure; the first flow distribution unit comprises a first spring arranged in the lower part of the water inlet channel and a first flow distribution ball fixed on the top of the first spring; The upper surface of the drainage joint is provided with a groove communicated with the first drainage channel; and the second flow distribution unit comprises a second spring arranged in the groove and a second flow distribution ball fixed on the top of the second spring. 3.The method according to claim 1, characterized in that: The mounting seat opposite to the filter cylinder is provided with a mounting groove; the filter unit further comprises a balance pipe connected with the drainage outlet and a balance unit arranged in the mounting groove; the balance unit comprises a mounting plate, a water collecting tank fixed on the mounting plate and a movable baffle movably arranged on the other side of the water collecting tank; the movable baffle is arranged opposite to the mounting plate; the movable baffle is fixed on the bottom of the groove wall of the mounting groove through a third spring; and the balance pipe passes through the mounting plate and extends into the water collecting tank. 4.The method according to claim 1, characterized in that: The bottom of the filter cylinder is provided with a control valve.

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