Rainwater storage structure

Abstract

This invention relates to the field of rainwater storage technology and discloses a rainwater storage structure, comprising: a storage and filtration unit having a porous media layer and an isolation and infiltration layer laid sequentially from top to bottom; and a drainage unit disposed within the storage and filtration unit, including a drainage ditch, the drainage ditch having an infiltration section and a discharge section, the infiltration section being lower than the discharge section and connected to the isolation and infiltration layer, rainwater entering the drainage ditch preferentially infiltrating into the isolation and infiltration layer through the infiltration section, and when the water level reaches the height of the discharge section, the rainwater is discharged through the discharge section. The rainwater storage structure provided by this invention utilizes the multi-level main infiltration of the storage and filtration unit and the low-level auxiliary infiltration of the drainage ditch to construct a dual-path synergistic infiltration flow, improving the infiltration flow rate and the rate of water reduction, effectively solving the technical problem of storage failure under heavy rainfall conditions caused by the single infiltration path in existing technologies.

Description

Technical Field

[0001] This invention relates to the field of rainwater storage technology, and in particular to a rainwater storage structure. Background Technology

[0002] In urban runoff management, stormwater storage structures are key facilities for balancing peak runoff and promoting rainwater collection and discharge. Currently, stormwater storage facilities mainly rely on underground spaces for temporary storage of rainwater and utilize the permeable layer at the bottom of the storage facility to slowly infiltrate it into the ground.

[0003] However, these existing technologies have the following drawbacks in practical engineering applications: existing water storage facilities mostly adopt a single bottom seepage path, which is limited by the geological permeability coefficient and structural contact area. As a result, the seepage flow per unit time is small, which leads to a slow water reduction rate in the context of continuous heavy rainfall. This makes it difficult to effectively cope with heavy rainfall and easily causes the water storage function to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a rainwater storage structure that integrates a drainage ditch with a low-level infiltration section and a high-level discharge section within a multi-level storage and filtration unit. This allows accumulated water flowing into the drainage ditch to preferentially infiltrate the isolation infiltration layer of the storage and filtration unit via the low-level infiltration section before triggering high-level discharge. This utilizes the main infiltration of the multi-level storage and filtration unit and the auxiliary infiltration of the drainage ditch to construct a dual-path synergistic infiltration, thereby improving the infiltration flow and water reduction speed of the rainwater storage structure. This solves the problem of storage failure under heavy rainfall conditions caused by the single infiltration path and slow reduction in the prior art.

[0005] To achieve the above objectives, the present invention provides a rainwater storage structure, comprising: A storage and filtration unit, comprising a porous media layer and an isolation and infiltration layer laid sequentially from top to bottom, wherein rainwater introduced into the storage and filtration unit permeates downward through the porous media layer and the isolation and infiltration layer in sequence. A drainage unit is provided within the storage and filtration unit. The drainage unit includes a drainage ditch, which has an infiltration section and a discharge section. The drainage ditch is connected to the isolation infiltration layer through the infiltration section, and the height of the infiltration section is lower than the height of the discharge section. Specifically, when rainwater in the regulating and filtering unit falls into the drainage ditch, the rainwater permeates into the isolation and permeability layer through the infiltration section; when the rainwater level in the drainage ditch reaches the height of the discharge section, the rainwater is discharged outward through the discharge section.

[0006] Furthermore, the regulating and filtering unit also includes a permeable pad layer, and the porous media layer, the permeable pad layer, and the isolation and permeation layer are arranged sequentially from top to bottom.

[0007] Furthermore, the porous media layer comprises a gravel loose layer and a sand and gravel cushion layer laid sequentially from top to bottom, the permeable cushion layer is geotextile, and the isolation and permeability layer is plain soil.

[0008] Furthermore, the drainage ditch includes a bottom plate and two side plates, the two side plates are spaced apart along a first direction, the lower ends of the two side plates are integrally connected to the bottom plate, the upper ends of the side plates extend into the gravel paving layer, and the lower ends of the side plates extend into the subsoil layer.

[0009] Furthermore, each of the two side plates of the ditch is provided with an installation groove at its upper end, and the installation grooves of the two side plates of the ditch are arranged opposite to each other. The drainage ditch also includes a grating cover and a protective net covering the upper surface of the grating cover. The grating cover is installed on the drainage ditch by having its two ends in the first direction respectively accommodated in the two installation grooves.

[0010] Furthermore, a supporting angle steel is fixedly installed in the mounting groove, and the supporting angle steel is used to support the grating cover plate.

[0011] Furthermore, the trench side plate is a concrete structure, and several supporting steel bars are pre-embedded inside the trench side plate. At least one end of the supporting steel bar extends out of the mounting groove and is welded to the supporting angle steel.

[0012] Furthermore, the drainage ditch also includes a support base, which is disposed at the lower end of the bottom plate of the ditch body, and the width of the support base in the first direction is greater than the width of the bottom plate of the ditch body.

[0013] Furthermore, the infiltration section includes an infiltration pipe, the first end of which is connected to the internal space of the drainage ditch and is higher than the upper surface of the bottom plate of the ditch, the second end of which is lower than the first end, the second end is connected to the subgrade layer, and is provided with a filter layer.

[0014] Furthermore, the discharge section includes an overflow pipe pre-embedded in one of the side plates of the ditch, the overflow pipe being located below the mounting groove, and the inlet end of the overflow pipe communicating with the internal space of the drainage ditch, and the outlet end of the overflow pipe being connected to the external drainage network.

[0015] Compared with the prior art, the rainwater storage structure of this invention has the following advantages: A drainage unit is integrated within the storage and filtration unit, allowing rainwater to not only infiltrate through the storage and filtration unit at multiple levels, but also to further infiltrate into the isolation infiltration layer through the infiltration section after entering the drainage ditch. This dual-path parallel infiltration breaks the limitation of single-path infiltration in existing storage facilities, increases the total infiltration flux per unit time, and accelerates the reduction of accumulated water. Utilizing the height difference between the infiltration section and the discharge section within the drainage ditch, rainwater preferentially replenishes groundwater through the infiltration section during the initial storage phase. Rainwater is only discharged when rainfall intensity is high and the water level continuously rises to the height of the discharge section, thus reducing the discharge pressure on the external drainage network and achieving on-site replenishment of groundwater. Attached Figure Description

[0016] Figure 1 This is a partial cross-sectional view of the rainwater storage structure according to an embodiment of the present invention; In the picture, 1. Regulating and filtration unit; 11. Porous media layer; 111. Gravel spread layer; 112. Sand and gravel cushion layer; 12. Insulation and permeability layer; 13. Permeable cushion layer; 2. Drainage unit; 21. Drainage ditch; 211. Infiltration section; 2111. Infiltration pipe; 212. Discharge section; 2121. Overflow pipe; 213. Ditch bottom plate; 214. Ditch side plate; 2141. Installation groove; 21411. Supporting angle steel; 2142. Supporting reinforcing steel; 215. Grating cover plate; 216. Support base; X, the first direction. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0018] In the description of this invention, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "lateral," and "longitudinal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0019] In the description of this invention, the terms "provided with," "set up," "connected," and "placed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0021] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] like Figure 1 As shown, an embodiment of the rainwater storage structure of the present invention includes: The storage and filtration unit 1 includes a porous media layer 11 and an isolation and infiltration layer 12 laid from top to bottom. Rainwater introduced into the storage and filtration unit 1 infiltrates downward through the porous media layer 11 and the isolation and infiltration layer 12 in sequence. Drainage unit 2 is disposed within storage and filtration unit 1. Drainage unit 2 includes drainage ditch 21, which has infiltration section 211 and discharge section 212. Drainage ditch 21 is connected to isolation infiltration layer 12 through infiltration section 211. The height of infiltration section 211 is lower than the height of discharge section 212. When rainwater in the storage and filtration unit 1 falls into the drainage ditch 21, the rainwater permeates into the isolation permeation layer 12 through the infiltration section 211; when the rainwater level in the drainage ditch 21 reaches the height of the discharge section 212, the rainwater is discharged outward through the discharge section 212.

[0023] Based on the above technical solution, a drainage unit 2 is integrated into the storage and filtration unit 1, so that rainwater can not only infiltrate through the storage and filtration unit 1 in multiple stages, but also, after entering the drainage ditch 21, it can infiltrate through the infiltration section 211 to the isolation infiltration layer 12. The parallel dual-path flow breaks the limitation of the single-path infiltration of the existing storage facilities, increases the total infiltration flux per unit time, and accelerates the reduction of water accumulation. Utilizing the height difference between the infiltration section 211 and the discharge section 212 in the drainage ditch 21, in the initial stage of storage, rainwater preferentially replenishes groundwater through the infiltration section 211. Only when the rainfall intensity is high and the water level continues to rise to the height of the discharge section 212 will the rainwater be discharged outward, which not only reduces the discharge pressure on the external drainage network, but also realizes the on-site replenishment of groundwater.

[0024] Preferably, the storage and filtration unit 1 further includes a permeable pad 13, and the porous media layer 11, the permeable pad 13, and the isolation and permeation layer 12 are arranged sequentially from top to bottom.

[0025] More preferably, the porous media layer 11 includes a gravel loose layer 111 and a sand and gravel cushion layer 112 laid from top to bottom, the permeable cushion layer 13 is geotextile, and the isolation and permeability layer 12 is plain soil.

[0026] The gravel paving layer 111 is responsible for the initial interception of large particles of impurities, while the sand and gravel cushion layer 112 performs secondary filtration. The sand and gravel cushion layer 112 is closely attached to the upper surface of the geotextile, forming a stable transition zone composed of sand and gravel and fine particles on the geotextile surface. This restricts the passage of even finer particles through the geotextile while maintaining sufficient porosity for water flow. The sand and gravel cushion layer 112 can disperse the water flow collected from the upper gravel paving layer 111, dispersing the upper load and water flow impact force, allowing rainwater to pass through the geotextile at a uniform and slow flow rate, thereby ensuring a stable infiltration rate even under heavy rainfall conditions. As a permeable cushion layer 13, the geotextile prevents the upper sand and gravel cushion layer 112 from sinking into the lower subsoil layer due to hydraulic action, and also prevents the lower subsoil layer from mixing upwards into the sand and gravel cushion layer 112 when it is saturated with water. This ensures that the pore structure of the upper porous media layer 11 will not fail due to interlayer mixing, guaranteeing the long-term effectiveness of the water storage space.

[0027] More preferably, the drainage ditch 21 includes a bottom plate 213 and two side plates 214. The two side plates 214 are spaced apart along the first direction X. The lower ends of the two side plates 214 are integrally connected to the bottom plate 213. The upper ends of the side plates 214 extend into the gravel paving layer 111, and the lower ends of the side plates 214 extend into the soil layer.

[0028] The inlet of the drainage ditch 21 is located within the gravel paving layer 111. The gravel paving layer 111 acts as a coarse filter for the drainage ditch 21. Large floating debris such as fallen leaves and plastic bags on the ground surface are intercepted on the gravel layer surface and do not fall directly into the drainage ditch 21. This ensures that the rainwater entering the drainage ditch 21 has undergone preliminary gravel filtration, preventing debris from covering and clogging the upper surface of the drainage ditch 21.

[0029] More preferably, each of the two side plates 214 of the ditch body is provided with an installation groove 2141 at its upper end. The installation grooves 2141 of the two side plates 214 of the ditch body are arranged opposite to each other. The drainage ditch 21 also includes a grating cover 215 and a protective net covering the upper surface of the grating cover 215. The grating cover 215 is respectively housed in the two installation grooves 2141 at its two ends in the first direction X so as to install the grating cover 215 on the drainage ditch 21.

[0030] The grating cover 215 can bear the load of the gravel spread layer 111; while the protective net covering its upper surface can effectively prevent fallen leaves, cigarette butts and small stones from falling into the drainage ditch 21. Combined with the coarse filtration of the gravel spread layer 111, it ensures that the rainwater entering the drainage ditch 21 has a high degree of cleanliness, protecting the bottom infiltration part 211 and the high-level drainage part from being easily entangled or blocked by debris, reducing the maintenance frequency of the rainwater storage structure. Dredging personnel only need to perform simple sweeping to complete the surface maintenance, without the need to frequently disassemble the cover to clean the inside, and the maintenance is simple. The grating cover 215 is installed in the installation groove 2141, which also facilitates the quick extraction and repositioning of the grating cover 215 when necessary, improving the inspection efficiency before and after heavy rainfall.

[0031] More preferably, a supporting angle steel 21411 is fixedly provided in the mounting groove 2141, and the supporting angle steel 21411 is used to support the grating cover plate 215.

[0032] More preferably, the side plate 214 of the trench is a concrete structure, and a number of supporting steel bars 2142 are pre-embedded inside the side plate 214. At least one end of the supporting steel bar 2142 extends out of the mounting groove 2141 and is welded to the supporting angle steel 21411.

[0033] The supporting angle steel 21411 not only plays a load-bearing role, but also avoids the deformation of the groove 2141 caused by rainwater erosion, thus preventing the grating cover 215 from becoming difficult to install, and ensures that the installation position of the grating cover 215 remains stable in the long term.

[0034] More preferably, the drainage ditch 21 further includes a support base 216, which is disposed at the lower end of the bottom plate 213 of the ditch body, and the width of the support base 216 in the first direction X is greater than the width of the bottom plate 213 of the ditch body.

[0035] The width of the support base 216 in the first direction X is greater than the width of the bottom plate 213 of the ditch, which increases the contact area between the drainage ditch 21 and the underlying soil layer, reduces the unit compressive stress of the drainage ditch 21 on the foundation, and can prevent uneven settlement of the drainage ditch 21 during long-term operation. At the same time, the wider support base 216 increases the overturning moment of the overall structure, ensuring the structural stability of the drainage ditch 21 when subjected to lateral pressure.

[0036] More preferably, the infiltration section 211 includes an infiltration pipe 2111, the first end of which is connected to the internal space of the drainage ditch 21, the infiltration pipe 2111 is connected to the internal space of the drainage ditch 21 and is higher than the upper end surface of the bottom plate 213 of the ditch, the second end of which is lower than the first end, the second end is connected to the soil layer and is provided with a filter layer.

[0037] The first end of the infiltration pipe 2111 is higher than the upper surface of the bottom plate 213 of the ditch, creating a sedimentation space of a certain depth at the bottom of the drainage ditch 21. This facilitates the deposition of heavy debris in the accumulated water onto the bottom plate 213, preventing silt particles from directly entering and clogging the infiltration pipe 2111. The second end of the infiltration pipe 2111 is lower than the first end, utilizing the gravitational potential energy generated by the water level difference to provide the driving force for seepage, thereby increasing the infiltration rate of rainwater into the subgrade. The filter layer located at the second end ensures smooth water flow while preventing the backflow or loss of particulate matter in the subgrade, ensuring the long-term unobstructed flow of the infiltration path.

[0038] Specifically, the drainage ditch 21 is provided with a plurality of infiltration pipes 2111 at intervals along its length.

[0039] More preferably, the discharge section 212 includes an overflow pipe 2121 pre-embedded in one of the side plates 214 of the ditch. The overflow pipe 2121 is located below the mounting groove 2141, and the inlet end of the overflow pipe 2121 is connected to the internal space of the drainage ditch 21, while the outlet end of the overflow pipe 2121 is connected to the external drainage network.

[0040] The overflow pipe 2121 is pre-embedded in the side plate 214 of the ditch and located below the installation groove 2141. The overflow pipe 2121 connects the internal space of the drainage ditch 21 with the external drainage network, providing a high-level flood discharge channel for accumulated water, ensuring that excess rainwater can be discharged in a timely manner under continuous heavy rainfall conditions, and ensuring the operational safety of the entire rainwater regulation and storage structure.

[0041] In summary, this embodiment of the invention provides a rainwater storage structure that integrates a drainage unit 2 within a storage and filtration unit 1. This allows rainwater to not only infiltrate through the storage and filtration unit 1 at multiple levels, but also to undergo auxiliary infiltration into the isolation infiltration layer 12 via the infiltration section 211 after entering the drainage ditch 21. This dual-path parallel approach breaks the limitation of single-path infiltration in existing storage facilities, increases the total infiltration flux per unit time, and accelerates the reduction of accumulated water. Utilizing the height difference between the infiltration section 211 and the discharge section 212 within the drainage ditch 21, rainwater preferentially replenishes groundwater via the infiltration section 211 during the initial storage phase. Rainwater is only discharged when the rainfall intensity is high and the water level continues to rise to the height of the discharge section 212, thus reducing the discharge pressure on the external drainage network and achieving on-site replenishment of groundwater.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A rainwater harvesting structure, characterized in that, The utility model relates to a rainwater storage and filtration unit (1) and a drainage unit (2) comprising: a rainwater storage and filtration unit (1) comprising a porous medium layer (11) and a barrier permeable layer (12) laid in sequence from top to bottom, rainwater introduced into the rainwater storage and filtration unit (1) penetrates downward through the porous medium layer (11) and the barrier permeable layer (12) in sequence; a drainage unit (2) arranged in the rainwater storage and filtration unit (1), the drainage unit (2) comprising a drainage ditch (21) having a permeable part (211) and a discharge part (212), the drainage ditch (21) being connected to the barrier permeable layer (12) through the permeable part (211), the height of the permeable part (211) being lower than that of the discharge part (212); wherein, when rainwater in the rainwater storage and filtration unit (1) falls into the drainage ditch (21), the rainwater penetrates into the barrier permeable layer (12) through the permeable part (211); when the water level of the rainwater in the drainage ditch (21) reaches the height of the discharge part (212), the rainwater is discharged outward through the discharge part (212).

2. The stormwater harvesting arrangement of claim 1, wherein, The rainwater storage and filtration unit (1) further comprises a water-permeable cushion layer (13), the porous medium layer (11), the water-permeable cushion layer (13), and the barrier permeable layer (12) are laid in sequence from top to bottom.

3. The rainwater harvesting structure of claim 2, wherein, The porous medium layer (11) comprises a gravel scattering layer (111) and a sandstone cushion layer (112) laid in sequence from top to bottom, the water-permeable cushion layer (13) is a geotextile, and the barrier permeable layer (12) is a plain soil layer.

4. The rainwater harvesting structure of claim 3, wherein, The drainage ditch (21) comprises a ditch body bottom plate (213) and two ditch body side plates (214), the two ditch body side plates (214) are arranged in a first direction (X) and spaced apart, the lower ends of the two ditch body side plates (214) are integrally connected to the ditch body bottom plate (213), the upper ends of the ditch body side plates (214) extend into the gravel scattering layer (111), and the lower ends of the ditch body side plates (214) extend into the plain soil layer.

5. The stormwater harvesting arrangement of claim 4, wherein, The upper ends of the two ditch body side plates (214) are each provided with a mounting groove (2141), the mounting grooves (2141) of the two ditch body side plates (214) are oppositely arranged, the drainage ditch (21) further comprises a grating cover plate (215) and a protective net covering the upper end face of the grating cover plate (215), and the grating cover plate (215) is mounted on the drainage ditch (21) by being accommodated in the mounting grooves (2141) at both ends thereof in the first direction (X).

6. The stormwater harvesting arrangement of claim 5, wherein, A support angle steel (21411) is fixedly arranged in the mounting groove (2141) and used for supporting the grating cover plate (215).

7. The stormwater harvesting arrangement of claim 6, wherein, The ditch body side plates (214) are of a concrete structure, a plurality of support steels (2142) are pre-embedded in the ditch body side plates (214), and at least one end of the support steels (2142) extends out of the mounting grooves (2141) and is welded to the support angle steel (21411).

8. The rainwater harvesting structure of claim 4, wherein, The drainage ditch (21) also includes a support base (216), which is located at the lower end of the bottom plate (213) of the ditch body. The width of the support base (216) in the first direction (X) is greater than the width of the bottom plate (213) of the ditch body.

9. The rainwater harvesting structure of claim 4, wherein, The infiltration section (211) includes an infiltration pipe (2111). The first end of the infiltration pipe (2111) is connected to the internal space of the drainage ditch (21) and is higher than the upper surface of the bottom plate (213) of the ditch. The second end of the infiltration pipe (2111) is lower than the first end and is connected to the soil layer. It is also provided with a filter layer.

10. The rainwater harvesting structure of claim 5, wherein, The discharge section (212) includes an overflow pipe (2121) pre-embedded in one of the side plates (214) of the ditch body. The overflow pipe (2121) is located below the mounting groove (2141), and the inlet end of the overflow pipe (2121) is connected to the internal space of the drainage ditch (21), while the outlet end of the overflow pipe (2121) is connected to the external drainage network.

Images