A sunken green land soil ventilation and water replenishment device for sponge city

Abstract

This utility model discloses a sunken green space soil aeration and water replenishment device for sponge cities, relating to the field of sunken green space technology. It aims to solve the technical problem of not being able to store rainwater. The device includes a sunken green space unit and a drainage system inside the unit. The drainage system includes a rain-collecting pipe and a venting mechanism on the outside of the pipe. The venting mechanism includes several vents. The inner wall of the rain-collecting pipe is provided with a partition mechanism. The support assembly includes an elastic plate and a sealing plate. The drainage device's interior is formed by the partition mechanism, creating vertically distributed storage and drainage chambers. This utility model has the advantages of using the partition mechanism to form storage chambers for temporary rainwater storage, preventing direct loss of rainwater during short-term heavy rainfall. The vents in the rain-collecting pipe allow rainwater to slowly seep into the planting soil layer, continuously replenishing water to ensure the plants' water absorption. It can adapt to different rainfall intensities and improve rainwater utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sunken green space technology, and more specifically, to a sunken green space soil aeration and water replenishment device for sponge cities. Background Technology

[0002] Sunken green spaces are an important facility in the construction of sponge cities. Sunken green spaces can be defined narrowly or broadly. Narrowly defined, they refer to green spaces that are less than 200mm below the surrounding paved ground or roads. Broadly defined, they refer to green spaces with a certain storage capacity that can be used to regulate and purify runoff rainwater. A narrowly defined sunken green space generally consists of a water storage layer, planting soil, original soil, an overflow outlet, and rainwater pipes. Its depression depth is typically 100-200mm, and the top elevation of the overflow outlet should generally be 50-100mm higher than the green space to ensure the overflow discharge of runoff during heavy rain. Sunken green spaces can collect surface runoff, replenish groundwater through soil infiltration, and use the collected and treated rainwater for non-drinking purposes such as green space irrigation, alleviating urban water shortages.

[0003] Currently, sunken green spaces directly discharge rainwater that accumulates on the top of the planting soil layer through rainwater pipes, preventing rainwater from accumulating on the top of the planting soil layer. This is exemplified by the technical solution provided by Chinese utility model patent CN209891349U. However, in actual rainwater drainage, this method has a significant drawback: rainwater cannot be stored. During short periods of heavy rainfall, the large amount of rainfall and the short duration of the rainfall cause most of the rainwater to be directly discharged through the rainwater pipes, leaving the original soil and planting soil layer insufficient time to absorb the rainwater, thus affecting the plants' need for rainwater during growth. Therefore, we propose a soil aeration and water replenishment device for sunken green spaces used in sponge cities. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a sunken green space soil aeration and water replenishment device for sponge cities, so as to solve the current technical problem of not being able to store rainwater.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a sunken green space soil aeration and water replenishment device for sponge cities, including a sunken green space device and a drainage device inside the sunken green space device; The drainage device includes a rain-collecting pipe and a venting mechanism on the outside of the rain-collecting pipe, the venting mechanism including a plurality of vent holes; The inner wall of the rain-collecting pipe is provided with a partition mechanism, which includes a support ring, a support rod, and support assemblies on both sides of the support rod. The support assembly includes an elastic plate and a sealing plate, with the sealing plate located on the bottom surface of the elastic plate. The drainage device forms vertically distributed liquid storage chambers and liquid discharge chambers inside through the partition mechanism. An expansion assembly is provided between the support rod and the sealing plate, and the expansion assembly includes an expansion column.

[0006] Preferably, the sunken green space device includes a native soil layer, a planting soil layer, and a road base surface. The native soil layer is located on top of the planting soil layer, and the native soil layer and the planting soil layer form a green planting surface. The native soil layer and the planting soil layer are located between the road base surface.

[0007] Preferably, a plurality of the air vents are formed on the outer wall of the rain-collecting pipe and are distributed in a circular array, and a nylon filter cloth is fixedly connected to the inner wall of the air vents.

[0008] Preferably, the support ring is fixedly installed on the inner wall of the rain-collecting pipe, and the top surface of the support rod is connected to one side of the bottom surface of the support ring by screws. The elastic plate is provided with assembly parts at both ends. The support rod and the sealing plate are fixedly connected to the elastic plate through the assembly parts. The elastic plate includes several curved parts, the bending directions of adjacent curved parts are opposite, and adjacent curved parts have an S-shaped structure design.

[0009] Preferably, the rain-collecting pipe is located inside the planting soil layer, and a partition ring is fixedly connected to the inner wall of the rain-collecting pipe. The sealing plate is located at the bottom surface of the partition ring, and the sealing plate and the top surface of the partition ring form a liquid storage cavity. A rain-draining pipe is fused to the bottom surface of the rain-collecting pipe. The rain-draining pipe is located inside the original soil layer, and the bottom surface of the sealing plate and the partition ring, together with the rain-draining pipe, form a liquid drainage cavity. The rain-collecting pipe protrudes from the top surface of the planting soil layer and is threadedly connected to a baffle cover. Several filter holes are opened inside the baffle cover. The filter holes communicate with the outside, and the filter holes and the liquid storage cavity form a rainwater entry channel.

[0010] Preferably, the support rod and the sealing plate are respectively provided with limiting grooves adapted to the expansion column on their contact surfaces with the expansion column, and the expansion column is located inside the limiting groove. The expansion column includes an assembly hole and a guide hole. The assembly hole is opened at the center of the expansion column, and the guide holes are arranged in a circular array inside the expansion column relative to the assembly hole.

[0011] Preferably, the bottom surface of the expansion column is provided with a guide assembly, which includes a positioning plate, a positioning stud, and a guide post. The positioning stud is fixedly connected to the center of the top surface of the positioning plate, and the guide post is fixedly connected to the top surface of the positioning plate in a circular array relative to the positioning stud. The sealing plate has an assembly hole adapted to the positioning stud and the guide post. The top surface of the positioning stud is threaded through the sealing plate and the assembly hole and connected to the bottom surface of the support rod. The top surface of the guide post is inside the guide hole and passes through the sealing plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the design of the elastic plate in the dividing mechanism, uses its own elasticity to drive the sealing plate to maintain its position, so that an independent liquid storage chamber is formed inside the rain-receiving pipe. After the rainwater is filtered to remove impurities by the rain drainage device, it enters the liquid storage chamber for temporary storage, avoiding the direct loss of rainwater during short-term heavy rainfall. At the same time, the vent holes on the outer wall of the rain-receiving pipe can slowly seep the rainwater in the liquid storage chamber into the planting soil layer, continuously replenishing the soil and ensuring the water absorption needs of the plant roots. This solves the pain point of "the soil not having enough time to absorb water and the plants lacking water" under the traditional drainage method, and solves the problem of not being able to store rainwater.

[0013] 2. This utility model also improves upon the design by causing the sealing plate to move downwards under pressure when the rainwater level in the storage chamber rises and its weight exceeds the elastic force of the elastic plate. This connects the storage chamber with the drainage chamber, allowing excess rainwater to be discharged through the drainage pipe, thus preventing waterlogging in the green area. In the event of prolonged rainfall, the expansion column will continuously push the sealing plate after absorbing water, keeping the drainage channel unobstructed and adapting to different rainfall intensities, further solving the problem of poor rainwater utilization. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the sunken green space device of this utility model; Figure 2 This is a structurally disassembled schematic diagram of the drainage device of this utility model; Figure 3 This is a cross-sectional schematic diagram of the rain-collecting pipe structure of this utility model; Figure 4 This is a disassembled schematic diagram of the separation mechanism structure of this utility model; Figure 5 This is a disassembled schematic diagram of the support component structure of this utility model; Figure 6 This is an enlarged schematic diagram of the elastic plate structure of this utility model; Figure 7 This is an enlarged schematic diagram of the expansion component structure of this utility model; Figure 8 This is an enlarged schematic diagram of the guide component structure of this utility model.

[0015] The following are the labels in the diagram: 1. Sunken green space device; 11. Original soil layer; 12. Planting soil layer; 13. Road base surface; 2. Drainage device; 21. Rain collection pipe; 22. Rain drainage pipe; 23. Separating ring; 24. Barrier cover; 3. Ventilation mechanism; 31. Ventilation hole; 32. Nylon filter cloth; 4. Separating mechanism; 41. Support ring; 42. Support rod; 5. Support assembly; 51. Elastic plate; 52. Bending part; 53. Assembly part; 54. Sealing plate; 6. Expansion assembly; 61. Expansion column; 62. Assembly hole; 63. Guide hole; 7. Guide assembly; 71. Positioning plate; 72. Positioning stud; 73. Guide column. Detailed Implementation

[0016] like Figures 1 to 8 As shown, this utility model relates to a sunken green space soil aeration and water replenishment device for sponge cities, including a sunken green space device 1 and a drainage device 2 inside the sunken green space device 1. The drainage device 2 includes a rain-collecting pipe 21 and a ventilation mechanism 3 on the outside of the rain-collecting pipe 21. The ventilation mechanism 3 includes a plurality of ventilation holes 31. A partition mechanism 4 is provided on the inner wall of the rain-collecting pipe 21. The partition mechanism 4 includes a support ring 41, a support rod 42 and support components 5 on both sides of the support rod 42. The support component 5 includes an elastic plate 51 and a sealing plate 54. The sealing plate 54 is located on the bottom surface of the elastic plate 51. The drainage device 2 is formed with vertically distributed liquid storage chambers and liquid drainage chambers through the partition mechanism 4. An expansion component 6 is provided between the support rod 42 and the sealing plate 54. The expansion component 6 includes an expansion column 61. The partition mechanism 4 forms a liquid storage chamber to temporarily store rainwater, preventing rainwater from being directly lost during short-term heavy rainfall. The vent 31 of the rain pipe 21 can also slowly infiltrate the rainwater in the liquid storage chamber into the planting soil layer 12, continuously replenishing water to ensure the water absorption of the green plants. It can adapt to different rainfall intensities and improve the rainwater utilization effect.

[0017] Specifically, the sunken green space device 1 includes a native soil layer 11, a planting soil layer 12, and a road base surface 13. The native soil layer 11 is located on top of the planting soil layer 12, and the native soil layer 11 and the planting soil layer 12 form a green planting surface. The native soil layer 11 and the planting soil layer 12 are located between the road base surface 13. The native soil layer 11 serves as the foundation for the planting soil layer 12, providing structural support for it. The planting soil layer 12 is the direct carrier for plant growth, and its soil composition and structure must meet the needs of plant growth. The road base surface 13 surrounds the native soil layer 11 and the planting soil layer 12, creating a height difference to facilitate the flow of surface runoff and rainwater into the sunken green space, while also defining the scope of the sunken green space.

[0018] Furthermore, several vents 31 are formed on the outer wall of the rain-collecting pipe 21 in a circular array, and a nylon filter cloth 32 is fixedly connected to the inner wall of the vents 31. The circular array of vents 31 ensures that the soil in all directions outside the rain-collecting pipe 21 can obtain a uniform aeration effect, while the nylon filter cloth 32 can effectively filter soil particles, impurities, and plant roots and stems, preventing them from entering the interior of the rain-collecting pipe 21 through the vents 31, causing blockage of the vents 31 or affecting the normal operation of the drainage device 2. In addition, rainwater accumulated in the liquid storage chamber inside the rain-collecting pipe 21 can seep into the planting soil layer 12 through the vents 31, which can realize the collection and storage of rainwater during short-term heavy rainfall and replenish the bottom of the planting soil layer 12, ensuring the water replenishment effect of the planting soil layer 12.

[0019] Furthermore, the support ring 41 is fixedly installed on the inner wall of the rain-receiving pipe 21, and the top surface of the support rod 42 is connected to one side of the bottom surface of the support ring 41 by screws. The elastic plate 51 is provided with assembly parts 53 at both ends. The support rod 42 and the sealing plate 54 are fixedly connected to the elastic plate 51 through the assembly parts 53 respectively. The elastic plate 51 includes several curved parts 52. The bending directions of adjacent curved parts 52 are opposite, and the adjacent curved parts 52 have an S-shaped structure design. The fixed connection between the support ring 41 and the inner wall of the rain-collecting pipe 21 ensures the stability of the installation of the separation mechanism 4. The screw connection facilitates the disassembly and maintenance of the support rod 42. The assembly part 53 provides a reliable interface for the connection between the elastic plate 51, the support rod 42, and the sealing plate 54, ensuring the firmness of the connection between the three. The S-shaped bending part 52 is the core of the elastic plate 51's elastic deformation capability. The opposite bending directions of adjacent bending parts 52 can disperse external forces, improve the deformation range and service life of the elastic plate 51, and enable it to better adapt to changes in rainwater pressure in the storage chamber. When the liquid level in the storage chamber is higher than that of the support ring 41, the weight of the stored liquid is higher than the elasticity of the elastic plate 51. The sealing plate 54 will be pressed against the elastic force of the elastic plate 51 and move downward. At this time, the sealing plate 54 will disengage from the separation ring 23, and the storage chamber and the drainage chamber will be connected to form a rainwater discharge channel, so that the rainwater collected in the storage chamber can be discharged, making the device adaptable to the rainy environment and ensuring smooth drainage of the device.

[0020] It is worth noting that the rain-collecting pipe 21 is located inside the planting soil layer 12. A partition ring 23 is fixedly connected to the inner wall of the rain-collecting pipe 21. The sealing plate 54 is located on the bottom surface of the partition ring 23. The sealing plate 54 and the top surface of the partition ring 23 form a liquid storage cavity. A rain-draining pipe 22 is fused to the bottom surface of the rain-collecting pipe 21. The rain-draining pipe 22 is located inside the original soil layer 11. The bottom surface of the sealing plate 54 and the partition ring 23, together with the rain-draining pipe 22, form a liquid drainage cavity. The rain-collecting pipe 21 protrudes from the top surface of the planting soil layer 12 and is threadedly connected to a baffle 24. Several filter holes are opened inside the baffle 24. The filter holes communicate with the outside and form a rainwater entry channel with the liquid storage cavity. The rainwater receiving pipe 21 is buried inside the planting soil layer 12, which can receive rainwater from the soil surface more directly. At the same time, it facilitates the contact between the vent 31 and the soil. The partition ring 23 and the sealing plate 54 cooperate to precisely divide the space of the liquid storage chamber, ensuring that rainwater can be temporarily stored in the liquid storage chamber. The rainwater drain pipe 22 cooperates with the original soil layer 11 to guide the rainwater in the drain chamber to the urban drainage system, reducing surface runoff. The baffle cover 24 is easy to disassemble and clean through threaded connection. Its internal filter holes can filter larger impurities such as leaves and stones carried by rainwater, preventing impurities from entering the rainwater receiving pipe 21 and blocking the channel, ensuring that the path of rainwater into the liquid storage chamber is unobstructed.

[0021] It is worth noting that the support rod 42 and the sealing plate 54 each have a limiting groove on their contact surfaces with the expansion column 61, which is adapted to fit the expansion column 61. The expansion column 61 is located inside the limiting groove. The expansion column 61 includes an assembly hole 62 and a guide hole 63. The assembly hole 62 is located at the center of the expansion column 61, and the guide holes 63 are arranged in a circular array inside the expansion column 61 relative to the assembly hole 62. The limiting groove can accurately position the installation position of the expansion column 61, preventing the expansion column 61 from shifting during use and ensuring that it can stably play its auxiliary adjustment role. The assembly hole 62 provides a channel for the connection between the expansion column 61 and the subsequent guide assembly 7. The guide hole 63 cooperates with the guide post 73 of the guide assembly 7 to further limit the deformation direction of the expansion column 61, preventing the expansion column 61 from affecting the normal working state of the sealing plate 54 due to disordered expansion. The expansion column 61 is designed with cross-linked polyacrylic acid material, and the cross-linking degree of the highly cross-linked polyacrylic acid is greater than 5%. After absorbing water, it becomes an elastic solid with a compressive strength of 1-3 MPa. It can overcome the elastic force of the elastic plate 51 after fully absorbing water and expanding, and push the sealing plate 54 downward to keep the liquid storage chamber and the liquid drainage chamber in a continuous communication state. It can continuously drain rainwater and ensure that the device can adapt to the long-term rainy environment. When the rain stops, as the ambient humidity decreases and the temperature rises, the water inside the expansion column 61 evaporates and the volume of the expansion column 61 will shrink. The elastic force of the elastic plate 51 drives the sealing plate 54 to reset, thereby forming a separation between the liquid storage chamber and the liquid drainage chamber.

[0022] It is worth noting that the bottom surface of the expansion column 61 is provided with a guide component 7, which includes a positioning plate 71, a positioning stud 72 and a guide post 73. The positioning stud 72 is fixedly connected to the center of the top surface of the positioning plate 71. The guide post 73 is fixedly connected to the top surface of the positioning plate 71 in a circular array relative to the positioning stud 72. The sealing plate 54 has an assembly hole adapted to the positioning stud 72 and the guide post 73. The top surface of the positioning stud 72 passes through the sealing plate 54 and the assembly hole 62 and is threaded to the bottom surface of the support rod 42. The top surface of the guide post 73 passes through the sealing plate 54 and is located inside the guide hole 63. The guide assembly 7 is a key structure connecting the support rod 42, the sealing plate 54, and the expansion column 61. The positioning plate 71 provides a unified installation reference for the positioning stud 72 and the guide column 73, ensuring their precise positioning. The positioning stud 72 is threaded to the support rod 42 through the sealing plate 54 and the assembly hole 62, thus firmly fixing the guide assembly 7, the expansion column 61, and the separation mechanism 4. The cooperation between the guide column 73 and the guide hole 63 not only guides the expansion direction of the expansion column 61 but also provides guidance for the movement of the sealing plate 54 when the elastic plate 51 deforms, preventing the sealing plate 54 from tilting and ensuring a stable sealing or communication effect between the liquid storage chamber and the liquid discharge chamber. Furthermore, the lengths of the positioning stud 72 and the guide column 73 are the same as the lengths of two expansion columns 61, ensuring that the lengths of the positioning stud 72 and the guide column 73 can adapt to the expansion range of the expansion column 61.

[0023] Working Principle: This embodiment provides a sunken green space soil aeration and water replenishment device for sponge cities. During use, the road base 13 in the sunken green space device 1 forms a height difference with the original soil layer 11 and the planting soil layer 12. During rainfall, surface runoff rainwater flows into the green planting area formed by the original soil layer 11 and the planting soil layer 12. The rainwater in the green planting area first contacts the baffle 24, which protrudes from the top surface of the planting soil layer 12 and is threadedly connected to the rainwater collection pipe 21. The filter holes inside the baffle 24 filter out larger impurities such as leaves and pebbles carried by the rainwater, preventing impurities from entering the rainwater collection pipe 21 and causing blockage. After filtration, the rainwater enters the liquid storage chamber inside the rainwater collection pipe 21 through the filter holes, which is formed by the partition ring 23 and the top surface of the sealing plate 54. This initial collection of rainwater is achieved. At this point, the amount of rainwater in the storage chamber is small, and the weight of the rainwater does not exceed the elastic force of the elastic plate 51. The elastic plate 51 remains in its initial state, causing the sealing plate 54 to tightly adhere to the bottom surface of the separating ring 23, separating the storage chamber from the drainage chamber formed by the sealing plate 54, the bottom surface of the separating ring 23, and the drain pipe 22. The rainwater is temporarily stored in the storage chamber. At the same time, the vent holes 31 distributed in a circular array on the outer wall of the rain-collecting pipe 21 play a role. On the one hand, they provide a ventilation channel for the planting soil layer 12, ensuring soil aeration. On the other hand, the nylon filter cloth 32 fixed to the inner wall of the vent holes 31 filters soil particles, impurities, and plant roots, preventing them from entering the rain-collecting pipe 21 and clogging the vent holes 31 or affecting the operation of the device. Additionally, some rainwater accumulates in the storage chamber. The rainwater will slowly seep into the planting soil layer 12 through the vent 31, replenishing the bottom of the planting soil layer 12 and meeting the water requirements for plant growth. As rainfall continues, the amount of rainwater in the storage chamber increases. When the rainwater level is higher than the support ring 41 and the weight of the rainwater exceeds the elastic force of the elastic plate 51, the sealing plate 54 will be pressed down to overcome the elastic force of the elastic plate 51. The S-shaped curved parts 52 on the elastic plate 51 with opposite bending directions undergo elastic deformation. At this time, the sealing plate 54 and the separating ring 23 are no longer in contact, and the storage chamber and the drainage chamber are connected to form a rainwater discharge channel. The rainwater collected in the storage chamber enters the drainage chamber and is then discharged through the drainage pipe 22, which is located inside the original soil layer 11 and is fused to the bottom surface of the rainwater receiving pipe 21, thus preventing excessive accumulation of rainwater in the storage chamber. In the event of prolonged rainfall, rainwater continuously enters the storage chamber. This rainwater comes into contact with the expansion column 61 between the support rod 42 and the sealing plate 54. The expansion column 61 is made of cross-linked polyacrylic acid, which has excellent water absorption and expansion properties. After absorbing water, it gradually expands. During the expansion process, the expansion column 61 expands stably within the limiting groove opened on the contact surface between the support rod 42 and the sealing plate 54. At the same time, the guide column 73 in the guide assembly 7 passes through the sealing plate 54 and is located within the guide hole 63 of the expansion column 61, providing directional guidance for the expansion of the expansion column 61 and preventing it from expanding disorderly. When the expansion column 61 has fully absorbed water and expanded, the thrust it generates will overcome the elasticity of the elastic plate 51, continuously pushing the sealing plate 54 downward, thus maintaining a continuous connection between the storage chamber and the drainage chamber.To ensure continuous drainage of rainwater through the drainage chamber and rainwater pipe 22, adapting to long-term rainfall environments, after rainfall stops, as ambient humidity decreases and temperature rises, the water inside the expansion column 61 gradually evaporates, and its volume continuously shrinks. When the thrust of the expansion column 61 is less than the elastic force of the elastic plate 51, the elastic plate 51 recovers its deformation due to its own elasticity, causing the sealing plate 54 to return to its original position and tightly adhere to the bottom surface of the separating ring 23, separating the storage chamber and drainage chamber again, so that rainwater can be collected and stored again during the next rainfall. Simultaneously, the guide assembly 7... The positioning stud 72, threaded through the assembly holes 62 of the sealing plate 54 and expansion column 61, is connected to the bottom surface of the support rod 42. Together with the positioning plate 71 and guide post 73, it not only ensures the firmness of the connection between the expansion assembly 6 and the separating mechanism 4, but also provides stable guidance for the sealing plate 54 during movement, preventing it from tilting and ensuring a stable sealing or communication effect between the liquid storage chamber and the drain chamber. The lengths of the positioning stud 72 and guide post 73 are designed to be the lengths of two expansion columns 61, fully accommodating the expansion range of the expansion columns 61.

[0024] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A sunken green space soil aeration and water replenishment device for sponge cities, characterized in that, Includes a sunken green space device (1) and a drainage device (2) inside the sunken green space device (1). The drainage device (2) includes a rain-collecting pipe (21) and a venting mechanism (3) on the outside of the rain-collecting pipe (21). The venting mechanism (3) includes a plurality of vent holes (31). The inner wall of the rain-collecting pipe (21) is provided with a partition mechanism (4). The partition mechanism (4) includes a support ring (41), a support rod (42), and support components (5) on both sides of the support rod (42). The support components (5) include an elastic plate (51) and a sealing plate (54). The sealing plate (54) is located on the bottom surface of the elastic plate (51). The drainage device (2) forms vertically distributed liquid storage chambers and liquid discharge chambers inside through the partition mechanism (4). An expansion assembly (6) is provided between the support rod (42) and the sealing plate (54), the expansion assembly (6) including an expansion column (61).

2. The sunken green space soil aeration and water replenishment device for sponge cities according to claim 1, characterized in that, The sunken green space device (1) includes a soil layer (11), a planting soil layer (12) and a road base surface (13). The soil layer (11) is located on top of the planting soil layer (12), and the soil layer (11) and the planting soil layer (12) form a green planting surface. The soil layer (11) and the planting soil layer (12) are located between the road base surface (13).

3. The sunken green space soil aeration and water replenishment device for sponge cities according to claim 1, characterized in that, A number of the aforementioned air vents (31) are opened on the outer wall of the rain-collecting pipe (21) and are distributed in a circular array. A nylon filter cloth (32) is fixedly connected to the inner wall of the air vents (31).

4. A sunken green space soil aeration and water replenishment device for sponge cities according to claim 2, characterized in that, The support ring (41) is fixedly installed on the inner wall of the rain-collecting pipe (21), and the top surface of the support rod (42) is connected to the bottom surface of the support ring (41) by screws. The elastic plate (51) has assembly parts (53) at both ends. The support rod (42) and the sealing plate (54) are fixedly connected to the elastic plate (51) through the assembly parts (53). The elastic plate (51) includes several curved parts (52). The bending directions of adjacent curved parts (52) are opposite, and the adjacent curved parts (52) are designed in an S-shape.

5. A sunken green space soil aeration and water replenishment device for sponge cities according to claim 4, characterized in that, The rain-collecting pipe (21) is located inside the planting soil layer (12). A partition ring (23) is fixedly connected to the inner wall of the rain-collecting pipe (21). The sealing plate (54) is located on the bottom surface of the partition ring (23). The top surface of the sealing plate (54) and the partition ring (23) form a liquid storage cavity. A rain-draining pipe (22) is fused to the bottom surface of the rain-collecting pipe (21). The rain-draining pipe (22) is located inside the original soil layer (11). The bottom surface of the sealing plate (54) and the partition ring (23) and the rain-draining pipe (22) form a liquid drainage cavity. The rain-collecting pipe (21) protrudes from the top surface of the planting soil layer (12) and is threadedly connected to a baffle (24). Several filter holes are opened inside the baffle (24). The filter holes are connected to the outside, and the filter holes and the liquid storage cavity form a rainwater entry channel.

6. A sunken green space soil aeration and water replenishment device for sponge cities according to claim 1, characterized in that, The support rod (42) and the sealing plate (54) are respectively provided with limiting grooves adapted to the expansion column (61) on their contact surfaces with the expansion column (61), and the expansion column (61) is located inside the limiting groove. The expansion column (61) includes an assembly hole (62) and a guide hole (63). The assembly hole (62) is opened at the center of the expansion column (61), and the guide hole (63) is arranged in a circular array inside the expansion column (61) relative to the assembly hole (62).

7. A sunken green space soil aeration and water replenishment device for sponge cities according to claim 6, characterized in that, The bottom surface of the expansion column (61) is provided with a guide component (7). The guide component (7) includes a positioning plate (71), a positioning stud (72), and a guide post (73). The positioning stud (72) is fixedly connected to the center of the top surface of the positioning plate (71). The guide post (73) is fixedly connected to the top surface of the positioning plate (71) in a circular array relative to the positioning stud (72). The sealing plate (54) has an assembly hole adapted to the positioning stud (72) and the guide post (73). The top surface of the positioning stud (72) is threaded through the sealing plate (54) and the assembly hole (62) and connected to the bottom surface of the support rod (42). The top surface of the guide post (73) is inside the guide hole (63) and passes through the sealing plate (54).

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