Rainwater treatment method for sunken greenbelt
By setting up vertical pipelines and permeable grates in the sinking green space, combined with the filter layer, the problem of overflow ports of the sinking green space is solved, rapid rainwater discharge and smooth pipeline network are achieved, and the normal operation of the park is ensured.
Patent Information
- Application Number
- CN202510867235.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2025-08-15
AI Technical Summary
The overflow ports of the existing sinking green space are easily blocked by mud and other debris during heavy rains, resulting in blockage of drainage pipes and untimely discharge of rainwater beyond the standard, resulting in water accumulation in the park and affecting normal life and work.
Vertical pipelines and permeable grates are installed in the sinking green space, combined with the first and second filter layers, filter out the silt and sand and other debris, and then enter the mud chamber of the vertical pipeline through the permeable grates, sediment and sand are deposited, and rainwater exceeding the standard enters the underground rainwater pipeline network through the communication port to achieve rapid discharge.
Effectively prevent silt and other debris from entering the underground rainwater pipeline network, ensure smooth drainage, quickly discharge rainwater beyond the standard, avoid pipeline blockage and water accumulation in the park, and ensure normal operation.
Smart Images
Figure CN120486553A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of urban ecological design, and in particular to a rainwater treatment method for a sunken green space. Background Art
[0002] To implement the philosophy of urban ecological civilization construction, practice the principles of ecological priority and green development, meet the national requirements for reconstructing a comprehensive system integrating water ecology, water resources, water environment, and water safety, and promote the scientific development of sponge cities nationwide, sponge city-specific designs are currently being incorporated into the construction drawing review phase. Sponge city system development is guided by planning, prioritizing ecology, prioritizing safety, adapting to local conditions, and implementing coordinated construction. Based on an analysis of the city's ecological baseline conditions, a variety of technical measures, including "infiltration, retention, storage, purification, utilization, and drainage," are employed to coordinate low-impact development rainwater systems, urban stormwater drainage systems, and excessive stormwater drainage systems. Therefore, in sponge city-specific designs, reservoirs and sunken green spaces are commonly used as LID storage facilities. To save costs, sunken green spaces are the most economical LID storage facility. However, due to their limited storage depth, the drainage system for excessive stormwater must be considered, requiring overflow outlets to be installed within these areas. In actual projects, a common practice is to directly set up the rainwater inlet as an overflow outlet, with the top of the rainwater inlet only a certain height above the sunken green space to achieve the desired storage depth. Although this can meet the storage purpose, when heavy rain occurs or the storage capacity of the sunken green space is exceeded, the excess rainwater is discharged into the rainwater network through the rainwater inlet set up in the sunken green space. Because the rainwater is mixed with a large amount of sediment and other debris, the drainage pipes of the rainwater inlets connected to the sunken green space are often blocked by sediment and other debris. The sediment deposited in the rainwater inlets can even completely block the drainage pipes, causing the excess rainwater in the sunken green space to overflow into the surrounding roads or squares, causing waterlogging in the park and seriously affecting the normal life or work of people in the park. Summary of the Invention
[0003] In order to solve the above problems, the present invention provides a rainwater treatment method for sunken green space, which can specifically adopt the following technical solutions: The rainwater treatment method for a sunken green space of the present invention comprises a green plant ground provided below the urban ground and a plurality of overflow drainage units provided thereon, wherein the overflow drainage unit comprises a vertical pipe provided on the green plant ground, a communication port being provided on the side of the vertical pipe, the communication port being connected to an underground rainwater pipe network, the vertical pipe further comprising a closed end below the communication port and an open end extending above the green plant ground, the vertical pipe between the closed end and the communication port constituting a sludge chamber, the open end being provided with a permeable grate, the top surface of the permeable grate being provided below the urban ground, and the outer side of the permeable grate being provided with a first filter layer and a second filter layer; The rainwater treatment method comprises: When the rainfall is within the design range of the water storage capacity of the sunken green space, the rainwater will be stored by the sunken green space; When the rainfall exceeds the design value of the water storage capacity of the sunken green space, the rainwater exceeding the top surface of the vertical pipe passes through the second filter layer and the first filter layer in turn, and after filtering out most of the mud and other debris, it enters the vertical pipe through the permeable grate and falls into the sedimentation chamber at the bottom of the vertical pipe. As the water level in the pipe rises, the small amount of mud and sand carried in the accumulated water is deposited at the bottom of the sedimentation chamber. When the water level reaches the connecting port, the accumulated water enters the underground rainwater pipe network through the connecting port for rapid discharge.
[0004] The vertical pipeline is built with MU20 sintered shale bricks, and a 20mm thick cement mortar finishing layer is provided on the inside.
[0005] The closed end includes a C25 concrete base plate disposed on a crushed stone cushion layer, and the C25 concrete base plate is sealed and connected to the vertical pipe.
[0006] The height of the sludge chamber is 180-220 mm.
[0007] The bottom of the mud chamber is provided with a mud accumulation layer with high sides and low middle.
[0008] The permeable grate adopts a truncated cone structure or a frustum structure according to the cross-sectional shape of the vertical pipe. The top and side surfaces of the permeable grate are provided with permeable holes, and the bottom surface of the permeable grate is provided with a folded edge structure connected to the vertical pipe.
[0009] The folded edge structure of the water-permeable grate is provided with an ear plate for passing a rotating shaft, and the ear plate is hingedly connected to the top surface of the vertical pipe.
[0010] The first filter layer is a permeable geotextile arranged around the side of the permeable grate, and the lower edge of the permeable geotextile is laid on the top surface of the vertical pipe.
[0011] The second filter layer is arranged outside the first filter layer. The second filter layer is composed of stacked pebbles. The stacked pebbles are arranged along the side of the permeable grate on the top surface of the vertical pipe and the green ground, and the top surface of the stacked pebbles is flush with the top surface of the permeable grate.
[0012] The rainwater treatment method for the sunken green space provided by the present invention is to set an overflow drainage unit in the sunken green space. The overflow drainage unit has a simple structure, convenient construction and low maintenance cost. The rainwater exceeding the standard can be introduced into the underground rainwater pipe network through the vertical pipe. At the same time, by setting a filter layer on the outside of the permeable grate on the top surface of the vertical pipe, it can effectively prevent mud and sand and other debris from entering the underground rainwater pipe network, thereby ensuring smooth drainage of the pipe network.
[0013] Compared with the prior art, the advantages of the present invention are as follows: The overflow outlet of the sunken green space is equipped with pebbles, permeable geotextiles and sedimentation chambers, which can effectively intercept most of the mud and other debris in the rainwater stored in the sunken green space, avoid mud and sand blocking the overflow outlet, and ensure that rainwater exceeding the standard can be quickly and effectively discharged from the overflow outlet of the sunken green space to the park rainwater pipe network.
[0014] This sunken green space overflow outlet utilizes the interception effect of surrounding pebbles, the permeability of permeable geotextile and the sediment deposition function of the sedimentation chamber. It not only effectively avoids the blockage of its connecting pipes, but also can quickly restore the full drainage capacity of the sunken green space overflow outlet after heavy rain by promptly cleaning up the debris around the overflow outlet and the sediment deposited in the sedimentation chamber. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the present invention (no filter layer is provided on the side of the permeable grate).
[0016] Figure 2 yes Figure 1 AA section view in.
[0017] Figure 3 yes Figure 1 BB cross-section diagram in.
[0018] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle permeable grate. DETAILED DESCRIPTION
[0019] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific working process. However, the protection scope of the present invention is not limited to the following embodiment.
[0020] In sponge city design, sunken green spaces, which serve as LID storage facilities, often fail to effectively prevent excessive rainwater from being mixed with large amounts of sediment and other debris if conventional overflow inlets are used. This often leads to blockages in drainage pipes connected to these overflow inlets. Consequently, excessive rainwater collected by the sunken green spaces cannot be promptly discharged into the park's rainwater network, leading to waterlogging in the park and seriously impacting the normal lives and work of park residents. The rainwater treatment method for sunken green spaces described in this invention can effectively prevent this from happening.
[0021] like Figure 1-4As shown, the rainwater treatment method for a sunken green space described in the present invention is suitable for a green plantation 2 located below an urban ground 1, wherein the green plantation 2 is provided with multiple overflow drainage units. The overflow drainage units include a vertical pipe 3 disposed on the green plantation 2, with a connecting port 4 formed on the side of the vertical pipe 3. The connecting port 4 is connected to the underground rainwater pipe network via a horizontal pipe 5. The vertical pipe 3 also has a closed end located below the connecting port 4 and an open end extending above the green plantation 2.
[0022] Specifically, the vertical pipe 3 is constructed from MU20 sintered shale bricks and finished with a 20mm thick 1:2 cement mortar finish on the inside. In this embodiment, the wall thickness of the vertical pipe 3 is 240mm, and its interior is a 680mm x 380mm rectangular structure. The bottom of the vertical pipe 3 is sealed to a 150mm thick C25 concrete base plate 6, forming a closed end. A 100mm thick crushed stone cushion is typically placed beneath the C25 concrete base plate 6.
[0023] The vertical pipe 3 between the closed end and the connecting port 4 forms a sludge chamber 7. Typically, a mud layer 8, higher on the sides and lower in the middle, is located at the bottom of the sludge chamber 7. This prevents sediment from accumulating at the corners of the chamber 7 and facilitates subsequent cleaning. This mud layer 8 is typically constructed using a secondary cast of C20 concrete on a C25 concrete base plate 6. The height of the sludge chamber 7 is typically 180-220 mm. In this embodiment, a 200 mm diameter pipe is selected as the horizontal pipe 5 and installed at the connecting port 4, located 200 mm above the mud layer 8.
[0024] The open end of the vertical pipe 3 is positioned above the green ground 2, at a height determined by the designed water storage capacity of the sunken green space. A permeable grate 9 is installed at the open end of the vertical pipe 3, with its top surface lower than the urban ground 1. To prevent debris such as mud and sand from entering the vertical pipe 3, a first filter layer and a second filter layer are installed on the outside of the permeable grate 9.
[0025] The above-mentioned permeable grate 9 adopts a truncated cone structure or a frustum structure according to the cross-sectional shape of the vertical pipe 3, which is convenient for connecting the two and making the interface tightly connected. Figure 4 In the frustum structure shown, the top and side surfaces of the above-mentioned permeable grate 9 are provided with permeable holes 10, and the bottom surface is provided with a folding structure 11 for connecting the vertical pipe 3. Furthermore, the folding structure 11 of the permeable grate 9 is provided with an ear plate 12 for passing a rotating shaft, and the ear plate 12 is hingedly connected to the top surface of the vertical pipe 3. When cleaning the debris in the vertical pipe 3, it is only necessary to flip the permeable grate 9 to open it, and the permeable grate 9 will not be lost. After cleaning, the permeable grate 9 is flipped back to close the open end of the vertical pipe 3, without the need for repositioning and installation, which is convenient and quick.
[0026] In order to achieve a good filtering effect and prevent debris such as mud and sand from entering the vertical pipe 3, the first filter layer is made of a permeable geotextile 13 arranged around the side of the permeable grate 9. The permeable geotextile 13 is made of 150g / m 2 The second filter layer is arranged outside the first filter layer. The second filter layer is composed of stacked pebbles 14. The stacked pebbles 14 are arranged on the top surface of the vertical pipe 3 and the green ground 2 along the side of the permeable grate 9, and the top surface of the stacked pebbles 14 is flush with the top surface of the permeable grate. The above-mentioned stacked pebbles 14 usually use pebbles with a particle size of 50-100mm and a stacking thickness of 100mm. In order to give full play to its interception effect on debris such as mud and sand in rainwater, the pebble particle size setting should be such that larger pebbles are selected for the outer edge and smaller pebbles are selected for the area close to the permeable grate 9.
[0027] The rainwater treatment method for a sunken green space of the present invention comprises: When the rainfall is within the design range of the water storage capacity of the sunken green space, the rainwater will be stored by the sunken green space; When the rainfall exceeds the design value of the water storage capacity of the sunken green space, the rainwater exceeding the top surface of the vertical pipe 3 passes through the second filter layer and the first filter layer in sequence, and after filtering out most of the mud and other debris, it enters the interior of the vertical pipe 3 through the permeable grate 9 and falls into the sedimentation chamber 7 at the bottom of the vertical pipe 3. As the water level in the pipe rises, a small amount of mud and sand carried in the accumulated water is deposited at the bottom of the sedimentation chamber 7. When the water level reaches the connecting port 4, the accumulated water enters the underground rainwater pipe network through the connecting port 4, realizing rapid discharge.
[0028] The details are as follows: When rainfall falls within the designed storage capacity of the sunken green space, rainwater accumulates in the green space. When rainfall exceeds the designed storage capacity, the accumulated water rises above the top of the vertical pipe 3. Rainwater then passes through the second and first filter layers, filtering out most of the silt and other debris. It then enters the vertical pipe 3 through the permeable holes 10 of the permeable grate 9 and falls into the silt chamber 7 at its bottom. As the accumulated water rises within the pipe, the small amount of silt carried by the rainwater settles on the silt layer 8. When the accumulated water reaches the level of the horizontal pipe 5, it enters the underground rainwater network through the horizontal pipe 5, allowing the excess rainwater to be quickly discharged. During rare, heavy rainstorms, the excess rainwater overflows the top of the permeable grate 9 and enters the vertical pipe 3 through the permeable holes 10 at its top. At this point, the silt and other debris carried by the rainwater settles in the silt chamber 7 under the action of gravity. The clarified rainwater then enters the underground rainwater network, preventing clogging of the drainage pipes. After the above filtration, the debris accumulated on the outside of the permeable grate 9 can be cleaned regularly; for the debris in the sludge chamber 7, it is generally cleaned after the rainstorm stops, so that the overflow port can restore the maximum drainage capacity in preparation for the next rainstorm.
[0029] The sunken green space overflow outlet described in the present invention is not only applicable to various greening terrain conditions, but also plays the role of regulating and storing the sunken green space LID facilities, quickly discharges rainwater that exceeds the standard, solves the problem of water accumulation during heavy rains, and avoids flooding. It can also greatly reduce the hazards of blockage of rainwater pipes and ensure the normal and safe operation of the project.
[0030] It should be noted that, in the description of the present invention, terms indicating orientation or positional relationships such as “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “inside”, and “outside” are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
Claims
1. A rainwater treatment method for a sunken green space, characterized by: The sunken green space includes a green plant ground provided below the urban ground and a plurality of overflow drainage units provided thereon, wherein the overflow drainage unit includes a vertical pipe provided on the green plant ground, a connecting port being provided on the side of the vertical pipe, the connecting port being connected to the underground rainwater pipe network, the vertical pipe further including a closed end below the connecting port and an open end extending above the green plant ground, the vertical pipe between the closed end and the connecting port forming a sludge chamber, the open end being provided with a permeable grate, the top surface of the permeable grate being provided below the urban ground, and the outer side of the permeable grate being provided with a first filter layer and a second filter layer; The rainwater treatment method comprises: When the rainfall is within the design range of the water storage capacity of the sunken green space, the rainwater will be stored by the sunken green space; When the rainfall exceeds the design value of the water storage capacity of the sunken green space, the rainwater exceeding the top surface of the vertical pipe passes through the second filter layer and the first filter layer in turn, and after filtering out most of the mud and other debris, it enters the vertical pipe through the permeable grate and falls into the sedimentation chamber at the bottom of the vertical pipe. As the water level in the pipe rises, the small amount of mud and sand carried in the accumulated water is deposited at the bottom of the sedimentation chamber. When the water level reaches the connecting port, the accumulated water enters the underground rainwater pipe network through the connecting port for rapid discharge.
2. The rainwater treatment method for a sunken green space according to claim 1, characterized in that: The vertical pipeline is built with MU20 sintered shale bricks, and a 20mm thick cement mortar finishing layer is provided on the inside.
3. The rainwater treatment method for a sunken green space according to claim 1, characterized in that: The closed end includes a C25 concrete base plate disposed on a crushed stone cushion layer, and the C25 concrete base plate is sealed and connected to the vertical pipe.
4. The rainwater treatment method for a sunken green space according to claim 1, characterized in that: The height of the sludge chamber is 180-220 mm.
5. The rainwater treatment method for a sunken green space according to claim 1, characterized in that: The bottom of the mud chamber is provided with a mud accumulation layer with high sides and low middle.
6. The rainwater treatment method for a sunken green space according to claim 1, characterized in that: The permeable grate adopts a truncated cone structure or a frustum structure according to the cross-sectional shape of the vertical pipe. The top and side surfaces of the permeable grate are provided with permeable holes, and the bottom surface of the permeable grate is provided with a folded edge structure connected to the vertical pipe.
7. The rainwater treatment method for a sunken green space according to claim 6, characterized in that: The folded edge structure of the water-permeable grate is provided with an ear plate for passing a rotating shaft, and the ear plate is hingedly connected to the top surface of the vertical pipe.
8. The rainwater treatment method for a sunken green space according to claim 7, characterized in that: The first filter layer is a permeable geotextile arranged around the side of the permeable grate, and the lower edge of the permeable geotextile is laid on the top surface of the vertical pipe.
9. The rainwater treatment method for a sunken green space according to claim 7, characterized in that: The second filter layer is arranged outside the first filter layer. The second filter layer is composed of stacked pebbles. The stacked pebbles are arranged along the side of the permeable grate on the top surface of the vertical pipe and the green ground, and the top surface of the stacked pebbles is flush with the top surface of the permeable grate.