An integrated rainwater infiltration and drainage system for sponge cities

Abstract

The present invention discloses an integrated rainwater infiltration and drainage system for sponge cities, which is applied to replace rainwater grates at road intersections and relates to the technical field of urban drainage. Specifically, it includes an infiltration and drainage group, a storage and regulation group, and a discharge box that are vertically arranged from top to bottom. The infiltration and drainage group includes a cover for blocking debris on the road surface, an infiltration and drainage box arranged below the cover, and a permeable layer arranged inside the infiltration and drainage box. The storage and regulation group includes a water storage capsule, a main root pipe, and several capillary root pipes. The system of the present invention intercepts debris on the road surface through the infiltration and drainage group to prevent it from flowing into the sewer pipe and forming a blockage. The rainwater flowing into the infiltration and drainage box penetrates through the permeable layer and adsorbs particulate matter. When it penetrates into the water storage capsule in the storage and regulation group and causes it to expand and store water, when the top of the water storage capsule expands and contacts the bottom of the infiltration and drainage box, it will reverse-pressure the water to drain downward into several main root pipes and seep into several capillary root pipes, reducing the pressure of rainwater infiltration and drainage on the sewer, alleviating waterlogging, and reducing rainwater pollution at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of urban drainage, and in particular to an integrated rainwater infiltration and drainage system for sponge cities. Background Art

[0002] A sponge city is an innovative manifestation that promotes the construction of green buildings, the development of low-carbon cities, and the formation of smart cities, and is an organic combination of modern green new technologies and various factors such as society, environment, and humanities. A sponge city can absorb, store, infiltrate, and purify rainwater when it rains, and release and utilize the stored water when needed, effectively controlling rainwater runoff and providing an excellent solution for the city to solve flood control and drainage problems and water quality purification problems.

[0003] The Chinese invention patent with the publication number CN107893469B discloses an integrated rainwater infiltration and drainage system for sponge cities, including an ecological grassed swale, a depressed green space, a rain garden, a main drain pipe, a rain well, a sump well, and a garden path; the ecological grassed swale is arranged along the edge of the garden path, the depressed green space is arranged in a low-lying area, the rain garden is arranged inside the green space, an overflow pipe for the ecological grassed swale and a rain well are arranged on the ecological grassed swale, a sump well is arranged between the depressed green space and the rain garden, the ecological grassed swale and the rain garden are connected by a main drain pipe, and the rain garden and the depressed green space collect rainwater into the sump well through the main drain pipe. This invention effectively improves the infiltration rate of rainwater, reduces rainwater runoff, improves rainwater quality, can be directly used for greening irrigation, has a high rainwater recycling rate, and saves water resources.

[0004] The above invention provides an infiltration and drainage system in urban ecological vegetation, achieving the functions of absorbing, storing, and purifying water; however, waterlogging in urban roads cannot be ignored and occupies a major position, which urgently needs to be solved; the existing rainwater grates at urban road intersections have a single function and only play the role of infiltrating water and intercepting large debris on the road surface; due to the lack of water storage capacity, the drainage pressure of the sewer is large, resulting in backflow and waterlogging. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide an integrated rainwater infiltration and drainage system for sponge cities to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides an integrated rainwater infiltration and drainage system for sponge cities, which is applied to replace the rainwater grate at a road intersection and includes an infiltration and drainage group, a storage and regulation group, and a discharge box that are vertically arranged from top to bottom;

[0007] The infiltration and drainage group includes a cover for blocking debris on the road surface, an infiltration and drainage box arranged below the cover, and a permeable layer arranged inside the infiltration and drainage box; the permeable layer is aligned from top to bottom and includes a water-permeable layer, a load-bearing layer, and a filtering layer; a number of vertical flushing pipes are embedded on one side of the cover, one side of the flushing pipes is communicated with one side of the infiltration and drainage box, and a sewage outlet for draining the flushing water of the permeable layer is arranged on the other side of the infiltration and drainage box;

[0008] The storage and regulation group includes a water storage capsule made of an elastic polymer material, a main root canal with a diversion function, a number of capillary root canals communicated with the outside of the bottom of the main root canal, and a filler layer arranged in the water storage capsule and expanding it into a cuboid; the upper and lower parts of the water storage capsule are respectively communicated and connected with the infiltration and drainage box and a number of main root canals, and the bottom end of the infiltration and drainage box is clamped with a storage and regulation cover for supporting the water storage capsule and a number of main root canals; the bottom end of the storage and regulation cover is communicated and clamped with a discharge box, and the discharge box extends and expands the space along the axial direction of the sewer pipe.

[0009] As a further improvement of this technical solution, the water-permeable layer is a nano-adsorption coating, which is composed of a silica-graphene composite porous membrane with a membrane thickness of 20-50μm and a graphene content of 5%-10%; the load-bearing layer is a honeycomb-shaped water-permeable concrete structure layer with a porosity of 25%-35%, and the filtering layer is an activated carbon fiber filtering grid with a pore diameter of 0.5-2mm; encapsulated bio-enzyme microcapsules, such as lipase and cellulase, are embedded in the filtering layer for decomposing organic pollutants.

[0010] As a further improvement of this technical solution, a number of strip-shaped grooves are arranged in a dot matrix array on the top surface of the cover, a sealing frame is clamped outside the cover, the sealing frame is a stepped frame structure, and a convex edge is arranged on the outer side of the top end of the infiltration and drainage box and is clamped and matched with the stepped surface of the sealing frame.

[0011] As a further improvement of this technical solution, a number of water-permeable holes are arranged at equal intervals on the bottom surface of the infiltration and drainage box, the water storage capsule is made of thermoplastic polyurethane elastomer, a number of capsule pipes corresponding to the water-permeable holes are communicated and arranged on the upper surface of the water storage capsule, and a number of capsule pipes penetrate to the lower surface of the water storage capsule and are sleeved and matched with a number of main root canals correspondingly, and filtering membranes are installed at both the upper and lower pipe orifices of the capsule pipes for maintaining the air pressure balance inside and outside the capsule.

[0012] As a further improvement of this technical solution, a micro air pump is arranged at the top of the water storage capsule, and a pressing plate for extruding the water storage capsule to drain water is sleeved at the shaft end of the micro air pump, and the filler layer is biological ceramsite particles and a slow-release phosphorus remover.

[0013] As a further improvement of this technical solution, the main root canal and a number of capillary root canals are printed into the shape of plant roots by 3D printing with a polylactic acid-nano clay composite, and a photocatalytic coating is applied on the surface of the main root canal. The photocatalytic coating is composed of The photocatalyst is combined with graphene quantum dots, and a fixing layer is filled outside several of the main water pipes.

[0014] As a further improvement of the technical solution, a fluorescence conversion layer, such as rare earth doped phosphor, is coated at the bottom of the photocatalytic coating for converting invisible ultraviolet light into visible light.

[0015] As a further improvement of the technical solution, a sealing rod is sleeved between the tops of several of the flushing water pipes. A plurality of branch water pipes are equidistantly embedded in the side walls of the flushing water pipes. A plurality of flushing holes corresponding to the plurality of branch water pipes are formed in the side wall of the infiltration and drainage box facing the flushing water pipes. A sewage discharge groove is formed in the other side of the infiltration and drainage box relative to the side wall where the flushing holes are located. The sewage discharge groove is located above the sewage outlet and is not communicated; the top surface of the permeation layer is flush with the bottom surface of the sewage discharge groove.

[0016] As a further improvement of the technical solution, a self-weight strip is rotatably connected between the top side walls of the sewage discharge groove, and the self-weight strip is adaptively clamped with the sewage discharge groove. A self-weight plate is rotatably connected between the top side walls of the sewage outlet, and the self-weight plate is adaptively clamped with the sewage outlet.

[0017] As a further improvement of the technical solution, the middle of the top surface of the discharge box is open, and a connecting sleeve is arranged on the top surface of the opening. The connecting sleeve is adaptively clamped with the bottom port of the regulating cover. A plurality of drain nozzles are communicated with the bottom surface of the discharge box, and a one-way water valve is sleeved in each drain nozzle. Elastic support columns are sleeved at both ends of the discharge box.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The integrated rainwater infiltration and drainage system for sponge city of the present invention includes an infiltration and drainage group, a regulating group and a discharge box which are vertically arranged from top to bottom; the infiltration and drainage group intercepts sundries on the road surface to prevent them from flowing into the sewer and causing blockage. The rainwater flowing into the infiltration and drainage box penetrates through the permeation layer and adsorbs particulate matters; the rainwater penetrates into the water storage capsules in the regulating group to cause them to expand and store water, and is purified again. When the top of the water storage capsule expands and contacts the bottom of the infiltration and drainage box, it will back-pressure the infiltration and drainage box to drain water downward into several main water pipes, and seep into several capillary water pipes, reducing the pressure of rainwater infiltration and drainage on the sewer, relieving waterlogging and reducing rainwater pollution at the same time.

[0020] 2. In the integrated rainwater infiltration and drainage system for sponge cities of the present invention, when a sprinkler or a cleaning vehicle passes through a road intersection, the top ends of a number of flushing pipes are regularly opened by a magnetically attracted sealing rod, and a water pipe is connected to the number of flushing pipes for water supply, so as to perform a lateral flushing on the infiltration layer; when water flows through the flushing pipes and water is pumped out from the water distribution pipes above, small particle debris can be washed away from the sewage trough and into the sewer; similarly, a number of water distribution pipes located on one side of the infiltration layer pump water to flush it, and the adsorbed substances between the inner wall pores are washed away, so as to achieve the cleaning effect and ensure that the infiltration layer maintains the functions of adsorption and purification.

[0021] 3. In the integrated rainwater infiltration and drainage system for sponge cities of the present invention, the surface of the main root pipe is coated with a photocatalytic coating, and the photocatalytic coating is composed of a photocatalyst and graphene quantum dots, which is used to improve the photocatalytic efficiency and degrade organic substances under weak light; a fluorescence conversion layer, such as rare earth doped phosphor powder, is coated at the bottom of the photocatalytic coating, which is used to convert invisible ultraviolet light into visible light and improve the degradation efficiency under low light conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are only for the purpose of explanation and are not intended to limit the scope of the disclosure of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically limiting the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can choose various possible shapes and proportional dimensions according to specific circumstances to implement the present invention under the teaching of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall assembly structure of the integrated rainwater infiltration and drainage system for sponge cities of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal assembly structure of the integrated rainwater infiltration and drainage system for sponge cities of the present invention;

[0025] Figure 3 It is the front view of the integrated rainwater infiltration and drainage system for sponge cities of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the infiltration and drainage group of the present invention;

[0027] Figure 5 It is a partial split view of the infiltration and drainage group of the present invention;

[0028] Figure 6 It is a schematic diagram of the internal structure of the storage and regulation group of the present invention;

[0029] Figure 7 It is an internal split view of the storage and regulation group of the present invention;

[0030] Figure 8Schematic structural diagram of the local sectional view of the discharge box of the present invention;

[0031] The meanings of each label in the figure are as follows:

[0032] 100, infiltration and drainage group; 110, sealing frame; 111, sealing cover; 1111, bayonet; 112, sealing rod;

[0033] 120, permeable layer; 121, water-permeable layer; 122, load-bearing layer; 123, filter layer; 130, flushing pipe; 131, water distribution pipe; 140, infiltration and drainage box; 141, flushing hole; 142, sewage discharge groove; 143, sewage discharge port; 144, water-permeable hole; 150, self-weight plate; 160, self-weight strip;

[0034] 200, storage and regulation group; 210, water storage capsule; 211, capsule pipe; 220, main root pipe; 221, capillary root pipe; 222, fixing layer; 230, filler layer; 240, storage and regulation cover;

[0035] 300, discharge box; 310, connecting sleeve; 320, drain nozzle; 330, elastic support column. Specific embodiments

[0036] Combined with the description of the specific embodiments of the present invention and the accompanying drawings, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, the concepts of those skilled in the art are based on any possible deformations of the present invention, and these should all be regarded as belonging to the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0037] The orientation or positional relationship indicated by the terms "central axis", "vertical", "horizontal", "front", "rear", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. used herein is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise specifically defined.

[0038] The present invention provides a sponge city rainwater infiltration and drainage integrated system, which is applied to replace the rainwater grate at the road intersection, such as Figure 1As shown in the figure, it includes a percolation and drainage group 100, a storage and regulation group 200, and a discharge box 300 that are vertically arranged from top to bottom. The percolation and drainage group 100 intercepts sundries on the road surface, preventing them from flowing into the sewer pipe to form blockages, alleviating waterlogging and reducing rainwater pollution at the same time. The cleaning staff only needs to clean the intercepted sundries every day to eliminate the obstacles of the percolation and drainage group 100.

[0039] As Figure 2 and Figure 3 As shown in the figure, the percolation and drainage group 100 includes a cover 111 for blocking sundries on the road surface, a percolation and drainage box 140 arranged below the cover 111, and a permeable layer 120 arranged inside the percolation and drainage box 140. The top surface of the cover 111 is provided with a number of strip-shaped grooves in a dot matrix array for passing rainwater and blocking sundries. A sealing frame 110 is clamped outside the cover 111, and the sealing frame 110 is installed on the sewer outlet. The sealing frame 110 is a stepped frame structure. A convex edge is provided on the outer side of the top end of the percolation and drainage box 140 and is clamped and matched with the stepped surface of the sealing frame 110, so that the percolation and drainage box 140 can be disassembled and taken out for recycling and cleaning.

[0040] Furthermore, as Figure 4 shown in the figure, the permeable layer 120 is aligned from top to bottom and includes a water-permeable layer 121, a load-bearing layer 122, and a filtering layer 123. The water-permeable layer 121 is a nano-adsorption coating, which is composed of silica-graphene composite into a porous membrane with a membrane thickness of 20-50μm; the graphene content is 5%-10% to ensure conductivity and mechanical strength, and the porosity of silica is 25%-35%. The surface of graphene is activated by injecting plasma through a plasma processor with a power of 50W and a time of 5 minutes to enhance surface hydrophilicity. Then, silica sol is coated by the dip-coating method with a pulling speed of 10mm / min and repeated 3 times. Then, it is calcined at a high temperature of 500-600°C for 2 hours using a high-temperature sintering furnace to remove the template and sinter to form a porous structure. The load-bearing layer 122 is a honeycomb-shaped water-permeable concrete structure layer with a porosity of 25%-35%, and the filtering layer 123 is an activated carbon fiber filtering grid with a pore diameter of 0.5-2mm, which plays a purifying role when rainwater passes through smoothly. Encapsulated bio-enzyme microcapsules, such as lipase and cellulase, are embedded in the filtering layer 123 to decompose organic pollutants and delay blockage.

[0041] Furthermore, a number of vertical flushing pipes 130 are embedded on one side of the cover 111. One side of the flushing pipes 130 is connected to one side of the percolation and drainage box 140, and a sewage outlet 143 for draining the flushing water of the permeable layer 120 is opened on the other side of the percolation and drainage box 140.

[0042] A sealing rod 112 is sleeved between the tops of several flushing water pipes 130. A bayonet 1111 that is engaged with the sealing rod 112 in a snap-fit manner is provided on the top surface of one side of the sealing cover 111. When a sprinkler or a cleaning vehicle passes through a road intersection, the tops of the several flushing water pipes 130 are regularly opened by magnetically attracting the sealing rod 112 with a magnet, and a water pipe is docked with the several flushing water pipes 130 to supply water, so as to perform a lateral flushing on the permeable layer 120.

[0043] Further, as Figure 5 shown, in order to prevent small particulate impurities falling into the infiltration and drainage box 140 from the strip-shaped groove of the sealing cover 111 from being cleaned, several sub-water pipes 131 are equidistantly embedded on the side wall of the flushing water pipe 130. Several flushing holes 141 corresponding to the several sub-water pipes 131 are provided on the side wall of the infiltration and drainage box 140 facing the flushing water pipe 130. A sewage discharge groove 142 is provided on the other side of the infiltration and drainage box 140 relative to the side wall where the flushing holes 141 are located. The sewage discharge groove 142 is located above the sewage outlet 143 and is not communicated; the top surface of the permeable layer 120 is flush with the bottom surface of the sewage discharge groove 142; the small particulate impurities are supported by the permeable layer 120 on the same horizontal plane as the sewage discharge groove 142. When the flushing water pipe 130 is filled with water and pumps water out from the upper sub-water pipes 131, the small particulate impurities can be washed away from the sewage discharge groove 142 and into the sewer; similarly, several sub-water pipes 131 on one side of the permeable layer 120 pump water to wash it, and the adsorbed substances between the inner wall pores are washed away, so as to achieve the cleaning effect and ensure that the permeable layer 120 maintains the functions of adsorption and purification.

[0044] In addition, in order to ensure that the internal space of the infiltration and drainage box 140 is in a sealed state, a self-weight strip 160 is rotatably connected between the top side walls of the sewage discharge groove 142, and the self-weight strip 160 is engaged with the sewage discharge groove 142 in a snap-fit manner. A self-weight plate 150 is rotatably connected between the top side walls of the sewage outlet 143, and the self-weight plate 150 is engaged with the sewage outlet 143 in a snap-fit manner; by embedding weight-increasing blocks in the bottoms of both the self-weight plate 150 and the self-weight strip 160, they are kept in a closed state under their own weights; when the flushing water pipe 130 is flushed, the self-weight plate 150 and the self-weight strip 160 can be flushed open to discharge dirt.

[0045] As Figure 6 and Figure 7 shown, the regulation and storage group 200 includes a water storage capsule 210 made of an elastic polymer material, a main root pipe 220 with a diversion function, several capillary root pipes 221 communicated with the outside of the bottom of the main root pipe 220, and a filler layer 230 arranged in the water storage capsule 210 and expanding it into a cuboid; the filler layer 230 is biological ceramsite particles and a slow-release phosphorus remover, and the biological ceramsite particles are used to adsorb heavy metal ions;

[0046] The upper and lower parts of the water storage capsule 210 are respectively connected to the infiltration and drainage box 140 and a number of main root pipes 220. A regulating cover 240 for supporting the water storage capsule 210 and a number of main root pipes 220 is clamped at the bottom end of the infiltration and drainage box 140; the rainwater is stored by the expansion and deformation of the water storage capsule 210 to reduce the pressure of rainwater infiltration and drainage on the sewer.

[0047] A discharge box 300 is connected and clamped at the bottom end of the regulating cover 240. The discharge box 300 extends and expands the space along the axial direction of the sewer pipe, which is used to temporarily store the purified rainwater and reduce the pressure of sewer discharge.

[0048] Furthermore, a number of water permeable holes 144 are equally spaced on the bottom surface of the infiltration and drainage box 140. The water storage capsule 210 is made of thermoplastic polyurethane elastomer, with a Shore hardness of 20A - 40A and a tensile rate ≥ 300%; the volume of the capsule after expansion is 1.2 - 2 times that in the compressed state; a number of capsule pipes 211 corresponding to and sleeved with the water permeable holes 144 are connected to the upper part of the water storage capsule 210, and a number of capsule pipes 211 penetrate to the lower part of the water storage capsule 210 and are sleeved and matched with a number of main root pipes 220 correspondingly.

[0049] Filter membranes are installed at both the upper and lower pipe orifices of the capsule pipe 211 to maintain the air pressure balance inside and outside the capsule; a micro air pump is arranged at the top of the water storage capsule 210, and a pressing plate for extruding the water in the water storage capsule 210 is sleeved at the shaft end of the micro air pump; the micro air pump is powered by an external power supply of a roadside lamp post; the flow velocity sensor is set to detect the water flow velocity and trigger the active operation of the micro air pump to squeeze and discharge the water inside the water storage capsule 210 to avoid waterlogging; due to the high resilience of the water storage capsule 210, when the rainfall stops or the external water level drops, the capsule automatically contracts due to the elasticity of the material, the internal pressure increases, and the stored rainwater is extruded downward through the capsule pipe 211.

[0050] In addition, in order to further store rainwater, the main root pipe 220 and a number of capillary root pipes 221 are printed into the shape of plant roots by 3D printing using a polylactic acid - nano clay composite to increase the water flow contact area and extend the retention time; a photocatalytic coating is applied on the surface of the main root pipe 220, and the photocatalytic coating is composed of a photocatalyst and graphene quantum dots to improve the photocatalytic efficiency and degrade organic substances under weak light; a fluorescence conversion layer, such as rare earth doped phosphor powder, is coated at the bottom of the photocatalytic coating to convert invisible ultraviolet light into visible light and improve the degradation efficiency under low light conditions; a fixing layer 222 is filled outside a number of main root pipes 220, and the fixing layer 222 is an adhesive layer for condensing a number of main root pipes 220 sleeved in the regulating cover 240.

[0051] Such as Figure 8As shown in the figure, the top surface of the discharge box 300 is open in the middle, and a connecting sleeve 310 is provided on the open top surface. The connecting sleeve 310 is adaptively clamped with the bottom port of the regulating cover 240. A plurality of drain nozzles 320 are communicated with the bottom surface of the discharge box 300, and a one-way water valve is sleeved in the drain nozzles 320. Elastic support columns 330 are sleeved on both side ends of the discharge box 300;

[0052] The elastic support column 330 is composed of an annular valve body and an elastic member; the elastic member is composed of a guide rod sleeved with the valve body, a plunger head sleeved at the bottom end of the guide rod, and a spring sleeved outside the guide rod and located above the valve body; the plunger head is pre-tightened on the bottom surface of the valve body by the spring. When the water pressure in the discharge box 300 exceeds the elastic force of the spring, the guide rod is compressed to squeeze the spring, so that the plunger head leaves the valve body to open the drainage; automatic drainage is carried out after setting a certain capacity to prevent the discharge box 300 from being filled with water; it is a pure mechanical structure without electronic components and is suitable for harsh environments.

[0053] When the sponge city rainwater infiltration and drainage integrated system of the present invention is in use, after the rainwater gathers, a large number of long strips and large-area sundries on the road surface are first intercepted by the cover 111 of the infiltration and drainage group 100. The rainwater flowing into the infiltration and drainage box 140 penetrates through the permeable layer 120 and adsorbs particulate matters; it penetrates into the water storage capsule 210 in the regulating group 200 to make it expand and store water, and is purified again. When the top of the water storage capsule 210 expands and contacts the bottom of the infiltration and drainage box 140, it will back-pressure the box to drain water downward into a plurality of main root pipes 220, and seep into a plurality of capillary root pipes 221, slowing down the pressure of rainwater infiltration and drainage on the sewer; when the water pressure in the discharge box 300 exceeds the elastic force of the spring, the guide rod is compressed to squeeze the spring, so that the plunger head leaves the valve body to open the drainage; automatic drainage is carried out after setting a certain capacity to prevent the discharge box 300 from being filled with water; it is a pure mechanical structure without electronic components and is suitable for harsh environments;

[0054] When a sprinkler or a cleaning vehicle passes through the road intersection, the top ends of a plurality of flushing pipes 130 are regularly opened by magnetically attracting the sealing rod 112 by a magnet, and a water pipe is docked with the plurality of flushing pipes 130 to supply water, so as to perform a horizontal flushing on the permeable layer 120; when water flows through the flushing pipes 130 and pumps water out from the upper water distribution pipes 131, small particle sundries can be washed away from the sewage trough 142 and enter the sewer; similarly, a plurality of water distribution pipes 131 located on one side of the permeable layer 120 pump water to flush it, and the adsorbed substances between the inner wall pores are washed away, so as to achieve the cleaning effect and ensure that the permeable layer 120 maintains the functions of adsorption and purification.

[0055] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sponge city rainwater infiltration and drainage integrated system, which is applied to replace the rainwater grate at the road intersection, and is characterized in that: It includes a percolation and drainage group (100), a storage and regulation group (200), and a discharge box (300) that are vertically arranged from top to bottom; The percolation and drainage group (100) includes a cover (111) for blocking debris on the road surface, a percolation and drainage box (140) arranged below the cover (111), and a permeable layer (120) arranged inside the percolation and drainage box (140); The permeable layer (120) is aligned from top to bottom and includes a water-permeable layer (121), a load-bearing layer (122), and a filter layer (123); several vertical flushing pipes (130) are embedded on one side of the cover (111), one side of the flushing pipes (130) is connected to one side of the percolation and drainage box (140), and a sewage outlet (143) for draining the flushing water of the permeable layer (120) is opened on the other side of the percolation and drainage box (140); The storage and regulation group (200) includes a water storage capsule (210) made of an elastic polymer material, several main root pipes (220) with a guiding function, and a filler layer (230). Several capillary root pipes (221) are connected and arranged on the outer side of the bottom of each main root pipe (220); The filler layer (230) is arranged inside the water storage capsule (210) and is used to expand the water storage capsule (210) into a cuboid; the upper and lower parts of the water storage capsule (210) are respectively connected to the percolation and drainage box (140) and several main root pipes (220). A storage and regulation cover (240) for supporting the water storage capsule (210) and several main root pipes (220) is clamped at the bottom end of the percolation and drainage box (140); the bottom end of the storage and regulation cover (240) is connected and clamped to the discharge box (300), and the discharge box (300) extends and expands the space along the axial direction of the sewer pipe; Several water-permeable holes (144) are equally spaced on the bottom surface of the percolation and drainage box (140). The water storage capsule (210) is made of thermoplastic polyurethane elastomer. Several capsule pipes (211) corresponding to the water-permeable holes (144) are connected and arranged on the upper surface of the water storage capsule (210), and several capsule pipes (211) penetrate to the lower surface of the water storage capsule (210) and are sleeved and matched with several main root pipes (220). Filter membranes are installed at both the upper and lower pipe orifices of the capsule pipes (211) to maintain the air pressure balance inside and outside the capsule.

2. The integrated sponge city rainwater infiltration and drainage system according to claim 1, characterized in that: The water-permeable layer (121) is a nano-adsorption coating, which is made of a composite of silica-graphene into a porous membrane, with a membrane thickness of 20 - 50μm and a graphene content of 5% - 10%; The load-bearing layer (122) is a honeycomb-shaped water-permeable concrete structure layer with a porosity of 25% - 35%; The filter layer (123) is an activated carbon fiber filter grid with a pore diameter of 0.5 - 2mm. Encapsulated bio-enzyme microcapsules, including lipase and cellulase, are embedded in the filter layer (123) for decomposing organic pollutants.

3. The integrated sponge city rainwater infiltration and drainage system according to claim 1, characterized in that: Several strip-shaped grooves are arranged in a dot matrix array on the top surface of the cover (111). A sealing frame (110) is clamped outside the cover (111). The sealing frame (110) is a stepped frame structure. A convex edge is arranged on the outer side of the top end of the percolation and drainage box (140) and is clamped and matched with the stepped surface of the sealing frame (110).

4. The integrated rainwater infiltration and drainage system for sponge city according to claim 1, characterized in that: A micro air pump is provided at the top of the water storage capsule (210), and a pressing plate for squeezing the water storage capsule (210) to drain water is sleeved on the shaft end of the micro air pump. The filler layer (230) is composed of biological ceramsite particles and a slow-release phosphorus remover.

5. The integrated sponge city rainwater infiltration and drainage system according to claim 1, characterized in that: The main root canal (220) and the capillary root canals (221) are made of a polylactic acid-nano clay composite and are 3D printed into the morphology of plant roots. The surface of the main root canal (220) is coated with a photocatalytic coating, and a fixing layer (222) is filled outside the main root canal (220).

6. The integrated rainwater infiltration and drainage system for sponge city according to claim 5, wherein: The photocatalytic coating consists of a composite of a photocatalyst and graphene quantum dots, and a fluorescence conversion layer is coated at the bottom of the photocatalytic coating for converting invisible ultraviolet light into visible light.

7. The integrated sponge city rainwater infiltration and drainage system according to claim 1, characterized in that: A sealing rod (112) is sleeved between the tops of a number of the flushing pipes (130). A number of branch pipes (131) are equidistantly embedded in the side walls of the flushing pipes (130). A number of flushing holes (141) corresponding to the number of branch pipes (131) are formed in the side wall of the infiltration and drainage box (140) facing the flushing pipes (130). A sewage discharge groove (142) is formed in the other side wall of the infiltration and drainage box (140) relative to the side wall where the flushing holes (141) are located. The sewage discharge groove (142) is located above the sewage outlet (143) and is not connected. The top surface of the infiltration layer (120) is flush with the bottom surface of the sewage discharge groove (142).

8. The integrated sponge city rainwater infiltration and drainage system according to claim 7, characterized in that: A self-weight bar (160) is rotatably connected between the top side walls of the sewage discharge groove (142), and the self-weight bar (160) is adaptively clamped with the sewage discharge groove (142). A self-weight plate (150) is rotatably connected between the top side walls of the sewage outlet (143), and the self-weight plate (150) is adaptively clamped with the sewage outlet (143).

9. The integrated sponge city rainwater infiltration and drainage system according to claim 1, characterized in that: The top surface of the discharge box (300) is open in the middle, and a connecting sleeve (310) is provided on the top surface of the opening. The connecting sleeve (310) is adaptively clamped with the bottom port of the storage cover (240). A number of drain nozzles (320) are communicated with the bottom surface of the discharge box (300), and a one-way water valve is sleeved in each drain nozzle (320). Elastic support columns (330) are sleeved on both side ends of the discharge box (300).

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