Sponge city green belt rainwater collection and seepage system

Abstract

The utility model discloses a kind of sponge city green belt rainwater collection and drainage systems, including pretreatment area, shallow percolation area and deep storage area, the pretreatment area, shallow percolation area and deep storage area are sequentially arranged intercommunication along rainwater flow direction;The pretreatment area includes water-permeable road, the water-permeable road lower side is equipped with fill and broken stone in turn;The shallow percolation area includes green belt, and the lower side of green belt, fill and broken stone in the shallow percolation area is equipped with modular storage and infiltration box;The deep storage area includes water storage tank, and the water storage tank is equipped with inspection pipe between ground, and is equipped with arc pipe between modular storage and infiltration box, float ball is equipped in the water storage tank, and bottom is equipped with drain pipe.The above structure not only solves the core pain point that traditional rainwater system is easy to block, difficult to maintain, but also realizes the collection, infiltration, storage and utilization of rainwater by grading treatment and intelligent control.

Description

Technical Field

[0001] This utility model relates to the technical field of sponge city construction and rainwater resource utilization, and in particular to a rainwater collection and drainage system for green belts in sponge cities. Background Technology

[0002] A sponge city refers to transforming a city into a "sponge," enabling it to adapt to environmental changes and respond to natural disasters like a sponge. When it rains, the city absorbs, stores, infiltrates, and purifies water, and can utilize it when needed, thus minimizing the impact on the city.

[0003] With the advancement of sponge city construction, green belts, as an important form of "green infrastructure," are widely used for rainwater collection on expressway bridges and for surrounding rainwater runoff. Existing green belt rainwater systems (such as sunken green spaces and bioretention ponds) typically suffer from the following problems: 1. Traditional gravel blind drains or perforated pipes are easily blocked by mud, sand, organic matter and other substances during long-term operation, which leads to failure of the seepage function, and is difficult to dredge and maintain, resulting in high costs. 2. Most systems only focus on rapid infiltration or short-term water storage, and do not give enough consideration to the "slow discharge and release" and "graded utilization" of water resources, thus failing to maximize the value of rainwater resources. Summary of the Invention

[0004] The purpose of this invention is to provide a rainwater collection and drainage system for green belts in sponge cities, which solves the problems mentioned above.

[0005] To achieve the above objectives, a rainwater collection and drainage system for green belts in sponge cities is provided, comprising a pretreatment zone, a shallow infiltration zone, and a deep storage zone. These three zones are sequentially arranged and interconnected along the rainwater flow direction. The pretreatment zone includes a permeable road, beneath which fill and gravel are sequentially arranged. A diversion pipe is located beneath the gravel, and a waterproof membrane is located beneath the diversion pipe. The shallow infiltration zone includes a green belt, and a modular infiltration tank is located beneath the green belt, fill, and gravel. The top and upper sidewalls of the modular infiltration tank have numerous micropores, and connecting pipes are provided between adjacent modular infiltration tanks. The deep storage zone includes a water tank, with an inspection pipe between the water tank and the ground, and an arc-shaped pipe between the water tank and the modular infiltration tank. A float is located inside the water tank, and a drainage pipe is located at the bottom.

[0006] According to the aforementioned sponge city green belt rainwater collection and drainage system, the upper half of the diversion pipe is provided with through holes, and one end is located inside the modular infiltration storage tank.

[0007] According to the aforementioned sponge city green belt rainwater collection and drainage system, one end of the arc-shaped pipe is located inside the modular infiltration tank, and the other end is located inside the water storage tank. The height of the end of the arc-shaped pipe inside the modular infiltration tank is lower than the height of the end inside the water storage tank.

[0008] According to the aforementioned sponge city green belt rainwater collection and infiltration system, the other end of the drainage pipe is connected to a river or urban drainage pipe, the drainage pipe is equipped with a ball valve, and the float ball is equipped with a control switch.

[0009] According to the aforementioned sponge city green belt rainwater collection and drainage system, the bottom of the water storage tank is inclined, and the position near the drain pipe is the inclined bottom.

[0010] According to the sponge city green belt rainwater collection and drainage system, a water level monitoring device is fixedly connected to the inner wall of the water storage tank, and the water level monitoring device is higher than the end of the arc-shaped pipe located inside the water storage tank.

[0011] This utility model has the following beneficial effects: 1. Compared with existing technologies, the multi-stage pretreatment zone consisting of "permeable road → backfill → gravel → diversion pipe" effectively intercepts and filters large particulate suspended solids and impurities in rainwater, reducing the risk of system blockage from the source.

[0012] Compared to existing technologies, the shallow infiltration zone and the deep storage zone are connected by an arc-shaped pipe, and the water in the modular infiltration tank is drained using the siphon principle. This process generates a high-speed water flow that automatically flushes and carries away the sediment deposited at the bottom of the tank, achieving "automatic cleaning" of the system. This greatly reduces maintenance frequency and costs, and ensures the long-term infiltration efficiency of the system.

[0013] Compared to existing technologies, this system, by incorporating a float and water level monitoring device within the deep storage zone, can monitor water levels in real time. When encountering heavy rain and the water level exceeds a safe threshold, the system can automatically open the ball valve for rapid drainage, effectively preventing flooding. The entire process requires no manual intervention and is intelligent and reliable. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a structural diagram of a rainwater collection and drainage system for green belts in sponge cities, according to this utility model. Figure 2 This is a structural diagram of the pretreatment area of ​​a rainwater collection and drainage system for green belts in sponge cities, according to this utility model. Figure 3 This is a structural diagram of the shallow infiltration zone of a rainwater collection and drainage system for green belts in sponge cities, according to this utility model. Figure 4This is a structural diagram of the deep storage zone of a rainwater collection and drainage system for green belts in sponge cities, according to this utility model. Figure 5 This is a structural diagram of the overflow pipe of a rainwater collection and drainage system for green belts in sponge cities, according to this utility model.

[0015] Legend: 1. Pretreatment zone; 11. Permeable road; 12. Geomembrane; 2. Shallow infiltration zone; 21. Green belt; 22. Modular infiltration tank; 23. Connecting pipe; 24. Arc-shaped pipe; 25. Micropore; 3. Deep storage zone; 31. Water tank; 32. Inspection pipe; 4. Backfill; 5. Crushed stone; 6. Diversion pipe; 61. Through hole; 7. Float; 8. Water level monitoring device; 9. Drainage pipe; 91. Ball valve. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] Reference Figure 1-5 This utility model embodiment provides a rainwater collection and drainage system for green belts in sponge cities, which includes a pretreatment zone 1, a shallow infiltration zone 2, and a deep storage zone 3. The pretreatment zone 1, the shallow infiltration zone 2, and the deep storage zone 3 are arranged sequentially and interconnected along the rainwater flow direction. Pretreatment zone 1 includes a permeable road 11. A permeable curb is installed between one side of the permeable road 11 and the green belt. With the construction of sponge cities, permeable pavements, permeable curbs, and designs for green belts are becoming increasingly common. In this patent, rainwater falls onto the expressway bridge surface and then flows through rainwater pipes on the piers into the green median strip or the permeable road 11. The permeable road 11 is submerged in fill 4 and gravel 5. Fill 4 typically uses sandy loam with good permeability to further filter rainwater. The gravel 5 layer consists of gravel with a particle size of 10-30mm, primarily intercepting large suspended particles and impurities in the rainwater to prevent subsequent pipework from escaping. Blockage; Pretreatment zone 1 is located at the front end of the system and receives initial rainwater. A diversion pipe 6 is installed under the gravel 5. The diversion pipe 6 is made of PVC or HDPE material, and multiple rows of through holes 61 are evenly opened in its upper half to collect rainwater that has undergone preliminary filtration. One end of the diversion pipe 6 extends into the modular infiltration tank 22 of the shallow infiltration zone 2, and the other end is closed. An impermeable membrane 12 is installed under the diversion pipe 6. The impermeable membrane 12 is made of geosynthetic composite material to prevent rainwater from seeping into the deep soil and to ensure that the rainwater is guided to the diversion pipe 6. The design of pretreatment zone 1 effectively removes most of the suspended solids in the initial rainwater, reducing the load on subsequent treatment units.

[0018] The shallow infiltration zone 2 includes a green belt 21 planted with flood-tolerant plants whose root systems help maintain soil structure and absorb some pollutants. A modular infiltration tank 22 is located beneath the green belt 21, fill 4, and gravel 5 within the shallow infiltration zone 2. The modular infiltration tank 22 is a prefabricated, integrated plastic component (such as polypropylene (PP) or high-density polyethylene (HDPE)) with a hollow interior, providing a large water storage capacity. Numerous micropores 25, approximately 2–5 mm in diameter, are formed on the top and upper sidewalls of the modular infiltration tank 22, allowing rainwater to slowly infiltrate while preventing soil particles from entering. Connecting pipes 23 connect adjacent modular infiltration tanks 22, ensuring water level balance and water distribution among the tanks. The modular infiltration tank 22 not only stores rainwater but also allows for slow infiltration through the micropores 25, replenishing groundwater and utilizing soil and plant roots for biological purification.

[0019] The deep storage and retention zone 3 is located at the end of the system and is mainly used to store excess rainwater and achieve controlled discharge. The deep storage and retention zone 3 includes a water tank 31. A water level monitoring device 8 is fixedly connected to the inner wall of the water tank 31. The water level monitoring device 8 is higher than the end of the arc-shaped pipe 24 located inside the water tank 31. An inspection pipe 32 is provided between the water tank 31 and the ground, and an arc-shaped pipe 24 is provided between the water tank 31 and the modular infiltration storage tank 22. The diameter of the inspection pipe 32 is typically 300–500 mm, facilitating personnel access for inspection and maintenance. One end of the arc-shaped pipe 24 is located inside the modular infiltration storage tank 22, and the other end is located inside the water tank 31. The height of the end of the arc-shaped pipe 24 inside the modular infiltration storage tank 22 is lower than the end inside the water tank 31. One end of the arc-shaped pipe 24 between the water tank 31 and the modular infiltration storage tank 22 extends into the interior of the modular infiltration storage tank 22 near the bottom, while the other end is located inside the water tank 31. When the water level in the modular infiltration tank 22 is full and exceeds the inlet of the arc-shaped pipe 24, a siphon effect will be formed, which will quickly drain the water in the tank into the water storage tank 31. At the same time, the high-speed water flow can carry away the mud and sand that may be deposited at the bottom of the tank, realizing the "automatic cleaning" function.

[0020] The water storage tank 31 is equipped with a float 7 and a drain pipe 9 at the bottom. The other end of the drain pipe 9 is connected to a river or urban drainage pipe. The bottom of the water storage tank 31 is inclined, with the bottom near the drain pipe 9 being the inclined bottom. A ball valve 91 is installed on the drain pipe 9. The float 7 integrates a control switch, which consists of a limit switch, a magnet, and a control lever (this is prior art and will not be described in detail). Normally, the ball valve 91 is closed, and the water storage tank 31 stores water normally. During heavy rain, the ball valve 91 rises continuously with the water level. When the water level exceeds its set position, the control switch inside the float 7 is activated, opening the ball valve 91 to drain water from the water storage tank 31 and carry away the sediment and gravel at the bottom.

[0021] Working principle: Rainwater first falls onto the expressway bridge surface, then flows through rainwater pipes on the piers into the median strip. Some rainwater infiltrates directly, while the remaining runoff is initially filtered through layers of fill soil 4 and gravel 5, and then collected by diversion pipe 6 and introduced into the modular infiltration tank 22 in the shallow infiltration zone 2. The modular infiltration tank 22 receives rainwater through micropores 25 for temporary storage and slow infiltration. Excess rainwater is evenly distributed between the tanks through connecting pipes 23. When the water level in the modular infiltration tank 22 reaches a certain height, the siphon effect is activated through the arc-shaped pipe 24, rapidly transporting the rainwater to the water storage tank 31 in the deep retention zone 3. The water storage tank 31 stores the rainwater, and the water level is monitored by a water level monitoring device 8. During normal times, the water stored in the storage tank 31 can be used for greening irrigation or replenishing groundwater. During periods of heavy rain, when the water level in the storage tank 31 rises to a critical point, the float ball 7 controls the ball valve 91 to open, safely discharging excess rainwater into rivers or urban drainage pipes, while simultaneously achieving system self-cleaning. The entire system realizes the collection, infiltration, storage, and orderly discharge of rainwater, effectively alleviating urban flooding and improving the utilization rate of rainwater resources.

[0022] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A rainwater collection and drainage system for green belts in sponge cities, characterized in that, It includes a pretreatment zone (1), a shallow infiltration zone (2), and a deep storage zone (3), which are arranged sequentially and interconnected along the rainwater flow direction; The pretreatment zone (1) includes a permeable road (11), under which fill (4) and gravel (5) are arranged in sequence, under which a diversion pipe (6) is arranged, and under which an impermeable membrane (12) is arranged; the shallow infiltration zone (2) includes a green belt (21), and a modular infiltration storage box (22) is arranged under the green belt (21), fill (4) and gravel (5) in the shallow infiltration zone (2). The modular infiltration tank (22) has a large number of micropores (25) on its top and upper side wall, and a connecting pipe (23) is provided between adjacent modular infiltration tanks (22); the deep storage zone (3) includes a water tank (31), an inspection pipe (32) is provided between the water tank (31) and the ground, and an arc-shaped pipe (24) is provided between the water tank (31) and the modular infiltration tank (22), a float ball (7) is provided in the water tank (31), and a drain pipe (9) is provided at the bottom.

2. The rainwater collection and drainage system for green belts in sponge cities according to claim 1, characterized in that, The upper half of each diversion pipe (6) is provided with a through hole (61), and one end is located inside the modular infiltration tank (22).

3. A rainwater collection and drainage system for green belts in sponge cities according to claim 2, characterized in that, One end of the arc-shaped pipe (24) is located inside the modular infiltration tank (22), and the other end is located inside the water storage tank (31). The height of the end of the arc-shaped pipe (24) inside the modular infiltration tank (22) is lower than the height of the end inside the water storage tank (31).

4. A rainwater collection and drainage system for green belts in sponge cities according to claim 3, characterized in that, The other end of the drain pipe (9) is connected to a river or urban drainage pipe. A ball valve (91) is provided on the drain pipe (9), and a control switch is provided inside the float (7).

5. A rainwater collection and drainage system for green belts in sponge cities according to claim 4, characterized in that, The bottom of the water storage tank (31) is inclined, and the bottom is inclined near the drain pipe (9).

6. A rainwater collection and drainage system for green belts in sponge cities according to claim 5, characterized in that, A water level monitoring device (8) is fixedly connected to the inner wall of the water storage tank (31). The water level monitoring device (8) is located at one end of the arc-shaped pipe (24) inside the water storage tank (31).

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