Sponge city sinking green belt

Abstract

The utility model provides a sponge city sinking green belt which comprises water retaining brick walls symmetrically distributed on the two transverse sides of the green belt, and a planting area used for being filled with soil is formed between the water retaining brick walls. A water storage cavity with a hollow structure is formed in each overflow well, and a water inlet communicated with the outside is formed in the top of each overflow well; the tail end of the rainwater pipeline extends into the water storage cavity to achieve pipe network butt joint. The permeable guide pipe is embedded in the base position of the planting area in the longitudinal direction, transversely penetrates through the water storage cavities of all the overflow wells and achieves bidirectional hydraulic exchange through pipe wall holes; the whole planting area is filled with the ecological water filtering layer, the ecological water filtering layer comprises a drainage layer, a transition layer, a filter material layer and a covering layer which are filled from bottom to top, and the permeable guide pipe is embedded in the drainage layer. The uniform powder distribution swing mechanism with high levelness is provided, and the problems that water is easily accumulated in a part of a sinking green belt, and rainwater cannot be effectively utilized in a traditional drainage mode are solved.

Description

Technical Field

[0001] This utility model relates to the field of urban greening, specifically to a sunken green belt for sponge cities. Background Technology

[0002] During periods of heavy rain and other extreme weather, urban flooding frequently occurs, with large amounts of rainwater unable to drain in time. This not only severely impacts urban transportation, residents' lives, and the normal operation of infrastructure, but can also cause irreversible damage to the urban ecological environment. Furthermore, traditional drainage methods often directly discharge rainwater into municipal pipe networks, resulting in the waste of urban water resources and hindering their effective utilization.

[0003] Against this backdrop, the concept of sponge cities has emerged. Sponge cities emphasize strengthening urban planning, construction, and management to fully leverage the absorption, infiltration, and slow release of rainwater by buildings, roads, green spaces, and water systems, effectively controlling rainwater runoff and achieving a city development model of natural accumulation, infiltration, and purification. Sunken green belts, as an important component of sponge city construction, have multiple functions, including reducing rainwater runoff, purifying rainwater, and replenishing groundwater. However, existing sunken green belts still have many shortcomings in terms of structural design, rainwater harvesting and utilization efficiency, water purification effects, and ecological sustainability. For example, some sunken green belts have poor drainage, easily causing waterlogging; their rainwater filtration and purification capacity is limited, failing to effectively remove pollutants from rainwater; and they lack scientific planning in soil structure and vegetation selection, making it difficult to maintain good ecological functions in the long term. Therefore, developing a structurally sound and functionally complete sunken green belt for sponge cities is of significant practical importance and urgency. Summary of the Invention

[0004] The problem this utility model aims to solve is to provide a highly level powder distribution and uniform swing mechanism, which addresses issues such as water accumulation in some sunken green belts and the ineffective utilization of rainwater in traditional drainage methods.

[0005] The technical solution adopted by this utility model to solve the above problems is: a sunken green belt for sponge cities, comprising:

[0006] Water-retaining brick walls are symmetrically distributed on both sides of the green belt, and planting areas for filling soil are formed between the water-retaining brick walls;

[0007] Multiple overflow wells are longitudinally spaced within the planting area. The interior of each overflow well is a hollow water storage cavity, and the top is equipped with an inlet that communicates with the outside to directly collect surface runoff.

[0008] The end of the rainwater pipe of the municipal drainage system extends into the water storage cavity to achieve pipe network connection.

[0009] A permeable conduit is buried longitudinally at the base of the planting area. The permeable conduit passes through the water storage cavity of all overflow wells and achieves bidirectional hydraulic exchange through the pores in the conduit wall.

[0010] An ecological water filtration layer composed of multiple functional materials fills the entire planting area, including a drainage layer, a transition layer, a filter material layer, and a covering layer filled from bottom to top, with the permeable conduit buried in the drainage layer.

[0011] Multiple overflow wells are longitudinally spaced within the planting area. Each well has a hollow water storage chamber and an inlet at the top connecting to the outside to directly collect surface runoff. Permeable conduits, buried longitudinally at the base of the planting area, traverse the water storage chambers of all overflow wells, achieving bidirectional hydraulic exchange through the pores in the conduits. Excess water in the planting area is guided to the water storage chambers of the overflow wells via the permeable conduits in the drainage layer. When rainfall is heavy and water accumulation in the planting area exceeds a certain level, rainwater can enter the water storage chambers through the inlets of the overflow wells, diverting and storing rainwater, preventing excessive water accumulation in the planting area, and solving the problem of poor drainage and waterlogging in some sunken green belts. The rainwater pipes of the municipal drainage system extend to the water storage chambers of the overflow wells for network connection. Once the overflow well's storage chamber has accumulated a certain amount of rainwater, it can be transported to the municipal drainage system through rainwater pipes for further treatment and utilization. This achieves the collection and utilization of rainwater to a certain extent, reduces the waste of urban water resources, and solves the problem of ineffective rainwater utilization in traditional drainage methods.

[0012] Furthermore, the filter media layer is composed of graded sand and organic additives;

[0013] The particle size distribution and mass percentage of the graded sand are as follows: original soil accounts for 10.34%, coarse sand with a particle size of 1-2 mm accounts for 15.52%, and medium sand with a particle size of 0.25-1 mm accounts for 71.81%.

[0014] The organic additive is fine wood chips, which are incorporated at 1% of the total mass of the matrix. The mass ratio of sand particles of various sizes in the matrix meets the ratio of original soil: coarse sand: medium sand = 1:1.5:6.95. The addition of fine wood chips increases soil permeability and organic matter content, which is beneficial to microbial activity and plant root growth, thereby enhancing the ecological function and rainwater purification capacity of the filter layer.

[0015] Furthermore, the covering layer is composed of uniformly sized gravel with a diameter between 2 mm and 10 mm. The gaps between the gravel allow rainwater to infiltrate smoothly, ensuring unobstructed infiltration paths. The uniformity of the gravel also helps maintain the stability and aesthetics of the covering layer, reducing the accumulation of debris.

[0016] Furthermore, the transition layer is made of medium coarse sand with a particle size of 0.1 - 4 mm and a sieve passing rate of not less than 50% for 2 mm. A permeable geotextile is provided between the transition layer and the drainage layer. It can quickly transmit the rainwater infiltrated from the upper filter layer to the drainage layer, and has a certain water retention capacity to maintain the water balance of the ecological water filtration layer. The permeable geotextile provided between the transition layer and the drainage layer can effectively prevent the medium coarse sand particles from entering the drainage layer along with the water flow, avoid clogging of the drainage layer, ensure the smoothness of the drainage channel, and at the same time, the permeable geotextile allows water to pass through without affecting the drainage function of the whole system.

[0017] Furthermore, a ductile iron rain grate is installed on the top of the overflow well. The ductile iron rain grate covers the water inlet, and vertically penetrating through slots are spacedly arranged on the covering surface. Installing a ductile iron rain grate on the top of the overflow well, with its excellent high strength and high corrosion resistance, can always maintain the structural integrity without deformation or damage under long-term outdoor environment and frequent rainwater scouring. The vertically penetrating through slots spacedly arranged on the covering surface can, on the one hand, guide the surface runoff to quickly flow into the water inlet, accelerating the rainwater collection speed; on the other hand, intercept larger-sized sundries above the rain grate, preventing them from entering the overflow well and avoiding the subsequent drainage and water storage systems from being unable to operate normally due to clogging by sundries, thus ensuring the high efficiency and stability of the rainwater collection function of the overflow well.

[0018] Furthermore, steel wire hooks are pre-embedded on two opposite side walls of the water inlet. A pollution intercepting plastic net is suspended on each of the two steel wire hooks. The plastic net is integrally injection-molded by multiple plastic bands that cross each other in a cross shape, and water passing gaps are formed between the plastic bands. Steel wire hooks are pre-embedded on the opposite side walls of the water inlet and a pollution intercepting plastic net is suspended. The plastic net is integrally injection-molded by multiple plastic bands that cross each other in a cross shape. When rainwater flows through, the fine suspended solids and impurities carried in it will be intercepted, achieving secondary fine filtration of the rainwater. This structure greatly improves the cleanliness of the rainwater entering the overflow well without hindering the inflow of rainwater, reduces the subsequent rainwater treatment cost, safeguards the water quality of the entire drainage system, and maintains the normal operation of the system.

[0019] Furthermore, the steel wire hook has a "Ji" - shaped structure with two consecutive bends, including a vertically pre-embedded section, a support section bent outward, and a hanging section bent inward at the end; the pre-embedded section and the support section are embedded in the side wall of the water inlet by first welding to the frame steel bars on the side wall of the water inlet and then pouring concrete. The end of the hanging section is provided with barbs for passing through the water passing gaps between the plastic bands, and the surface of the steel wire hook is coated with an epoxy resin anti-corrosion layer. Under the same material consumption, compared with the traditional L - shaped or U - shaped structures, its lateral load resistance ability is effectively improved, avoiding deformation caused by the full load of the pollution intercepting net or water flow impact.

[0020] Furthermore, the contact surface between the water-retaining brick wall and the planting area is covered with impermeable geotextile to prevent rainwater from seeping through the gaps between them. Attached Figure Description

[0021] Figure 1 This is a top view of the present invention;

[0022] Figure 2 This is a partial cross-sectional view of the ecological filter layer of this utility model;

[0023] Figure 3 This is a partial sectional view of the overflow well of this utility model;

[0024] Figure 4 This is a top view of the sewage intercepting plastic mesh of this utility model;

[0025] Figure 5 for Figure 3 A magnified view of the circled area.

[0026] Diagram: 1. Water-retaining brick wall; 2. Overflow well; 2.1. Water storage cavity; 2.2. Water inlet; 3. Rainwater pipe; 4. Permeable conduit; 5. Ecological filter layer; 5.1. Drainage layer; 5.2. Transition layer; 5.3. Filter media layer; 5.4. Covering layer; 6. Ductile iron rainwater grate; 6.1. Through groove; 7. Wire hook; 7.1. Embedded section; 7.2. Support section; 7.3. Suspension section; 7.4. Barb; 8. Sewage intercepting plastic net; 8.1. Plastic strip; 9. Impermeable geotextile; 10. Permeable geotextile. Detailed Implementation

[0027] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof herein is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0028] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0029] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

[0030] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0031] Please see Figures 1 to 5 A type of sunken green belt in a sponge city has the following structural features: Water-retaining brick walls 1 are symmetrically distributed on both sides of its horizontal axis, forming a planting area for filling with soil between them.

[0032] Multiple overflow wells 2 are set longitudinally at intervals within the planting area. The overflow well 2 has a hollow water storage cavity 2.1 inside and an inlet 2.2 connected to the outside at the top, which can directly collect surface runoff. The end of the rainwater pipe 3 of the municipal drainage system extends into the water storage cavity 2.1 to realize the connection of the pipe network.

[0033] A permeable conduit 4 is buried longitudinally at the base of the planting area. The permeable conduit 4 runs through the water storage chamber 2.1 of all overflow wells 2 and achieves bidirectional hydraulic exchange through the pores in the conduit wall.

[0034] The entire planting area is filled with an ecological filter layer 5 composed of multiple functional materials, which consists of a drainage layer 5.1, a transition layer 5.2, a filter material layer 5.3, and a covering layer 5.4 from bottom to top. The permeable pipe 4 is buried in the drainage layer 5.1.

[0035] Among them, the filter material layer 5.3 is composed of graded sand and organic additives. The particle size ratio and mass percentage of the graded sand are as follows: the proportion of the original soil is 10.34%, the proportion of coarse sand with a particle size of 1 - 2 mm is 15.52%, and the proportion of medium sand with a particle size of 0.25 - 1 mm is 71.81%. The organic additive is fine wood chips, and the incorporation ratio is 1% of the total mass of the substrate. Moreover, the mass ratio of each particle size sand material of the substrate satisfies the ratio relationship of original soil: coarse sand: medium sand = 1:1.5:6.95.

[0036] The covering layer 5.4 is composed of uniformly sized gravel with a diameter between 2 mm and 10 mm.

[0037] The transition layer 5.2 uses medium and coarse sand with a particle size of 0.1 - 4 mm, and the sieve passing rate of 2 mm is not less than 50%. Moreover, a permeable geotextile 10 is provided between the transition layer 5.2 and the drainage layer 5.1.

[0038] A ductile iron rain grate 6 is installed at the top of the overflow well 2. The rain grate covers the water inlet 2.2, and vertically penetrating through slots 6.1 are arranged at intervals on the covering surface.

[0039] Steel wire hooks 7 are pre-buried on two opposite side walls of the water inlet 2.2. Pollution intercepting plastic nets 8 are respectively suspended on the two steel wire hooks 7. The plastic net is integrally injection molded by multiple plastic strips 8.1 that cross each other. Water passing gaps are formed between the plastic strips 8.1. An anti-seepage geotextile 9 is laid on the contact surface between the water retaining brick wall 1 and the planting area.

[0040] The steel wire hook 7 has a "U" - shaped structure with two consecutive bends, including a vertically pre - buried section 7.1, a support section 7.2 that bends outward, and a hanging section 7.3 whose end bends inward. The pre - buried section 7.1 is embedded into the side wall of the water inlet 2.2 by welding or concrete anchoring. The end of the hanging section 7.3 is provided with a barb 7.4 for passing through the water passing gap between the plastic strips 8.1, and the surface of the steel wire hook 7 is coated with an epoxy resin anti - corrosion layer.

[0041] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation to the claims. The present invention is not limited to the above embodiments, and its specific structure allows for changes. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A type of sunken green belt for sponge cities, characterized in that, Comprising: Water retaining brick walls (1) symmetrically distributed on both lateral sides of the green belt, with a planting area for filling soil formed between the water retaining brick walls (1); A plurality of overflow wells (2) longitudinally arranged at intervals in the planting area, with a hollow water storage cavity (2.1) inside the overflow wells (2), and a water inlet (2.2) communicating with the outside is provided at the top to directly collect surface runoff; The end of the rainwater pipe (3) of the municipal drainage system extends into the water storage cavity (2.1) to achieve pipe network connection; A permeable conduit (4) longitudinally buried at the base position of the planting area, the permeable conduit (4) crosses the water storage cavities (2.1) of all the overflow wells (2) and realizes two-way hydraulic exchange through the pore spaces on the pipe wall; An ecological water filtration layer (5) composed of multiple functional materials, which fills the entire planting area, including a drainage layer (5.1), a transition layer (5.2), a filter media layer (5.3), and a covering layer (5.4) filled from bottom to top. The permeable conduit (4) is buried in the drainage layer (5.1).

2. The sunken green belt for sponge cities according to claim 1, characterized in that: The filter media layer (5.3) is composed of graded sand and organic additives.

3. The sunken green belt for sponge cities according to claim 1, characterized in that: The covering layer (5.4) is composed of uniformly sized gravel with a diameter between 2 mm and 10 mm.

4. The sunken green belt for sponge cities according to claim 1, characterized in that: The transition layer (5.2) uses medium coarse sand with a particle size of 0.1 - 4 mm, and the sieve passing rate of 2 mm is not less than 50%. A permeable geotextile (10) is arranged between the transition layer (5.2) and the drainage layer (5.1).

5. The sunken green belt for sponge cities according to claim 1, characterized in that: A ductile iron rainwater grate (6) is installed on the top of the overflow well (2), the ductile iron rainwater grate (6) covers the water inlet (2.2), and vertically penetrating through slots (6.1) are spacedly arranged on the covering surface.

6. The sunken green belt for sponge cities according to claim 1, characterized in that: Steel wire hooks (7) are embedded on two opposite side walls of the water inlet (2.2), and a sewage intercepting plastic net (8) is suspended on each of the two steel wire hooks (7). The sewage intercepting plastic net (8) is integrally injection molded by multiple plastic strips (8.1) cross - intersecting, and water passing gaps are formed between the plastic strips (8.1).

7. A sunken green belt for sponge cities according to claim 6, characterized in that: The steel wire hook (7) has a "U" - shaped structure with two consecutive bends, including a vertically embedded section (7.1), an outward - bent support section (7.2), and a hanging section (7.3) with the end bent inward. The embedded section (7.1) and the support section (7.2) are welded to the frame steel bars on the side wall of the water inlet (2.2) in advance, and then concrete is poured to be embedded in the side wall of the water inlet (2.2). A barb (7.4) for passing through the water passing gaps between the plastic strips (8.1) is provided at the end of the hanging section (7.3), and the surface of the steel wire hook is coated with an epoxy resin anti - corrosion layer.

8. The sunken green belt for sponge cities according to claim 1, characterized in that: An anti - seepage geotextile (9) is laid on the contact surface between the water retaining brick wall (1) and the planting area.

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