Sponge city rainwater seepage and drainage integrated system

Abstract

The invention discloses a rainwater seepage and drainage integrated system for a sponge city, which is applied to a replacement rainwater grate at a road intersection, relates to the technical field of urban drainage, and specifically comprises a seepage and drainage group, a regulation and storage group and a drainage box which are vertically arranged from top to bottom; the seepage and drainage set comprises a sealing cover used for blocking sundries on the road surface, a seepage and drainage box arranged below the sealing cover and a seepage layer arranged in the seepage and drainage box. The regulation and storage group comprises a water storage capsule, a main root canal and a plurality of capillary root canals. According to the system, sundries on the road surface are intercepted through the seepage and drainage set and prevented from flowing into a sewer line to form blockage, and rainwater flowing into the seepage and drainage box permeates through the permeation layer and adsorbs particles; when the rainwater permeates into the water storage capsule in the regulation and storage group to be expanded to store water and the top of the water storage capsule is expanded to be in contact with the bottom of the seepage and drainage box, the seepage and drainage box is reversely pressed to downwards drain water into the main root pipes and seep into the capillary root pipes, so that the pressure of seepage and drainage of the rainwater to a sewer is relieved, and rainwater pollution is reduced while accumulated water is relieved.

Description

Technical Field

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

[0002] Sponge city is an innovative way to promote green building construction, low-carbon urban development and smart city formation. It is an organic combination of modern green new technology and social, environmental, humanistic and other factors. Sponge city can absorb water, store water, infiltrate water and purify water when it rains. When needed, it can release and utilize the stored water, effectively control rainwater runoff, and provide high-quality solutions for urban flood control and drainage problems and water purification problems.

[0003] The Chinese invention patent with announcement number CN107893469B discloses an integrated rainwater infiltration and drainage system based on sponge city, including ecological grass-planted ditch, sunken green space, rainwater garden, main drainage pipe, rainwater well, water collection well and garden road; the ecological grass-planted ditch is set along the edge of the garden road, the sunken green space is set in the low-lying area, the rainwater garden is set inside the green space, the ecological grass-planted ditch is provided with an ecological grass-planted ditch overflow pipe and a rainwater well, a water collection well is set between the sunken green space and the rainwater garden, the ecological grass-planted ditch is connected to the rainwater garden through the main drainage pipe, and the rainwater garden and the sunken green space collect rainwater into the water collection well through the main drainage pipe. The invention effectively increases the infiltration rate of rainwater, reduces rainwater runoff, improves the quality of rainwater, 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, which achieves the functions of water absorption, water storage and water purification; however, urban road waterlogging cannot be ignored, occupies a major position, and needs to be solved urgently; the rainwater grates at the existing urban road intersections have a single function and only play the role of infiltration and intercepting large debris on the road surface; due to the lack of water storage capacity, the sewer drainage pressure is high, resulting in backflow of water. Summary of the invention

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

[0006] To achieve the above-mentioned purpose, the present invention provides a sponge city rainwater infiltration and drainage integrated system, which is applied to replace rainwater grates at road intersections, and includes an infiltration and drainage group, a storage group and a discharge box vertically arranged from top to bottom; The drainage group includes a cover for blocking debris on the road surface, a drainage box arranged below the cover, and a permeable layer arranged inside the drainage box; the permeable layer includes a water-permeable layer, a load-bearing layer, and a filter layer aligned from top to bottom; a plurality of vertical flushing pipes are embedded on one side of the cover, one side of the flushing pipes is connected to one side of the drainage box, and a sewage outlet for draining flushing water from the permeable layer is opened on the other side of the drainage box; The regulating and storing group comprises a water storage capsule made of elastic polymer material, a main root canal with a diversion function, a plurality of capillary root canals connected to the outer side of the bottom of the main root canal, and a filling layer arranged in the water storage capsule and expanded into a rectangular parallelepiped; the upper and lower parts of the water storage capsule are respectively connected to a seepage and drainage box and the plurality of main root canals, and the bottom end of the seepage and drainage box is clamped with a regulating and storing cover for supporting the water storage capsule and the plurality of main root canals; the bottom end of the regulating and storing cover is connected with a discharge box, and the discharge box extends along the axial direction of the sewer pipe to expand the space.

[0007] As a further improvement of the present technical solution, the permeable layer is a nano-adsorption coating, which is a porous membrane composited with silica and graphene, with a membrane thickness of 20~50μm and a graphene content of 5%~10%; the load-bearing layer is a honeycomb permeable concrete structure layer with a porosity of 25%~35%, and the filter layer is an activated carbon fiber filter grid with a pore size of 0.5~2mm; the filter layer is embedded with coated biological enzyme microcapsules, such as lipase and cellulase, for decomposing organic pollutants.

[0008] As a further improvement of the technical solution, the top surface of the cover is provided with a plurality of strip grooves in a dot matrix array, the outside of the cover is snap-connected with a sealing frame, the sealing frame is a stepped frame structure, and the outer side of the top of the drainage box is provided with a convex edge which is snap-fitted with the stepped surface of the sealing frame.

[0009] As a further improvement of the present technical solution, a plurality of water-permeable holes are provided on the bottom surface of the drainage box at equal intervals, the water storage capsule is made of thermoplastic polyurethane elastomer, a plurality of capsule tubes corresponding to the plurality of water-permeable holes are connected to the top of the water storage capsule, and the plurality of capsule tubes pass through the bottom of the water storage capsule and are correspondingly socketed with a plurality of main root canals, and filter membranes are installed at the upper and lower tube openings of the capsule tubes to maintain the internal and external air pressure balance of the capsule.

[0010] As a further improvement of the technical solution, a micro air pump is arranged on the top of the water storage capsule and a pressure plate for squeezing the water storage capsule to drain water is sleeved on the shaft end of the micro air pump. The filler layer is biological ceramsite particles and slow-release phosphorus removal agent.

[0011] As a further improvement of the technical solution, the main root canal and several capillary root canals are 3D printed into plant root forms using a polylactic acid-nanoclay complex, and the surface of the main root canal is coated with a photocatalytic coating, which is composed of The photocatalyst is compounded with graphene quantum dots, and the outside of some of the main root canals is filled with a fixed layer.

[0012] As a further improvement of the technical solution, a fluorescent conversion layer, such as rare earth-doped fluorescent powder, is coated on the bottom of the photocatalytic coating to convert invisible ultraviolet light into visible light.

[0013] As a further improvement of the technical solution, a sealing rod is sleeved between the top ends of the flushing pipes, a plurality of water distribution pipes are embedded in the side walls of the flushing pipes at equal intervals, a plurality of flushing holes corresponding to the plurality of water distribution pipes are opened on the side walls of the infiltration and drainage box facing the flushing pipes, and a sewage trough is opened on the other side of the side wall where the flushing holes are located, and the sewage trough is located above the sewage outlet and is not connected; the top surface of the permeable layer is flush with the bottom surface of the sewage trough.

[0014] As a further improvement of the technical solution, a self-weight bar is rotatably connected between the top and side walls of the sewage trough, and the self-weight bar is adapted to be snap-fitted into the sewage trough. A self-weight plate is rotatably connected between the top and side walls of the sewage outlet, and the self-weight plate is adapted to be snap-fitted into the sewage outlet.

[0015] As a further improvement of the present technical solution, the middle part of the top surface of the discharge box is open and a connecting sleeve is provided on the open top surface, the connecting sleeve is adapted to be snap-fitted with the bottom port of the regulating cover, a plurality of drain nozzles are provided on the bottom surface of the discharge box and a one-way water valve is provided inside the drain nozzle, and elastic support columns are provided on both side ends of the discharge box.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The integrated rainwater infiltration and drainage system for sponge cities of the present invention includes an infiltration and drainage group, a regulating and storage group, and a discharge box which are vertically arranged from top to bottom. The infiltration and drainage group intercepts debris on the road surface 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 infiltration layer and adsorbs particulate matter. The water capsules that penetrate into the regulating and storage group expand and store water, and are purified again. When the top of the water capsule expands and contacts the bottom of the infiltration and drainage box, it is back-pressured to drain water downward into a number of main root canals, and infiltrates into a number of capillary root canals, thereby reducing the pressure of rainwater infiltration to the sewer, alleviating water accumulation and reducing rainwater pollution.

[0017] 2. The integrated rainwater infiltration and drainage system for the sponge city of the present invention, when a sprinkler truck or a cleaning truck passes through a road intersection, regularly opens the top ends of several flushing pipes through a magnetic sealing rod, and connects the water pipes to several flushing pipes for water supply, so as to horizontally flush the permeable layer; when water is passed through the flushing pipes and pumped out from the upper water distribution pipes, small particles of debris can be flushed away from the sewage trough and into the sewer; similarly, several water distribution pipes located on one side of the permeable layer pump water to flush it, and flush away the adsorbed substances between the pores of its inner wall, so as to achieve the effect of cleaning, and ensure that the permeable layer maintains the adsorption and purification functions.

[0018] 3. The integrated rainwater infiltration and drainage system of the sponge city of the present invention is provided with a photocatalytic coating on the surface of the main root canal. The photocatalytic coating is composed of The photocatalyst is composited with graphene quantum dots to improve the photocatalytic efficiency and degrade organic matter under weak light. A fluorescent conversion layer, such as rare earth-doped phosphor, is coated on the bottom of the photocatalytic coating to convert invisible ultraviolet light into visible light, thereby improving the degradation efficiency under low light conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art, under the guidance of the present invention, select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0020] Figure 1 This is a schematic diagram of the overall assembly structure of the sponge city rainwater infiltration and drainage integrated system of the present invention; Figure 2 This is a schematic diagram of the internal assembly structure of the sponge city rainwater infiltration and drainage integrated system of the present invention; Figure 3 This is a front view of the integrated rainwater infiltration and drainage system for sponge cities of the present invention; Figure 4 It is a schematic diagram of the internal structure of the drainage group of the present invention; Figure 5 It is a partial split diagram of the drainage group of the present invention; Figure 6 It is a schematic diagram of the internal structure of the storage group of the present invention; Figure 7 It is the internal split diagram of the regulation and storage group of the present invention; Figure 8 It is a schematic diagram of the structure of the discharge box of the present invention in a partial cross-sectional state; The meaning of each number in the figure is: 100, seepage drainage group; 110, sealing frame; 111, sealing cover; 1111, bayonet; 112, sealing rod; 120, permeable layer; 121, water-permeable layer; 122, load-bearing layer; 123, filter layer; 130, flushing pipe; 131, water distribution pipe; 140, drainage box; 141, flushing hole; 142, drainage trough; 143, drainage outlet; 144, permeable hole; 150, self-weight board; 160, self-weight strip; 200, regulating and storing group; 210, water storage capsule; 211, capsule tube; 220, main root canal; 221, capillary root canal; 222, fixing layer; 230, filling layer; 240, regulating and storing cover; 300, discharge box; 310, connecting sleeve; 320, drain nozzle; 330, elastic support column. DETAILED DESCRIPTION

[0021] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, the technical personnel's conception is based on any possible variation of the present invention, which should be regarded as belonging to the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which means direct connection and indirect connection through an intermediate medium.

[0022] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0023] The present invention provides a sponge city rainwater infiltration and drainage integrated system, which is applied to replace rainwater grates at road intersections, such as Figure 1 As shown, it includes an infiltration and drainage group 100, a storage group 200 and a discharge box 300 which are vertically arranged from top to bottom; the infiltration and drainage group 100 intercepts debris on the road surface to prevent it from flowing into the sewer pipe and forming a blockage, thereby alleviating water accumulation and reducing rainwater pollution; the cleaning staff will clean up the intercepted debris every day to eliminate the obstacle of the infiltration and drainage group 100.

[0024] like Figure 2 and Figure 3 As shown, the drainage group 100 includes a cover 111 for blocking debris on the road surface, a drainage box 140 arranged below the cover 111, and a permeable layer 120 arranged inside the drainage box 140; the top surface of the cover 111 is provided with a plurality of strip grooves in a dot matrix array for passing rainwater and blocking debris; the outside of the cover 111 is snap-connected with a sealing frame 110, which is installed on the sewer outlet, and the sealing frame 110 is a stepped frame structure, and the outer side of the top of the drainage box 140 is provided with a convex edge and is snap-fitted with the step surface of the sealing frame 110, so that the drainage box 140 can be disassembled and taken out for recycling and cleaning.

[0025] Further, such as Figure 4As shown, the permeation 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; the water-permeable layer 121 is a nano-adsorption coating, which is a porous membrane composited with silica-graphene, and the membrane thickness is 20-50 μm; the graphene content is 5%-10%, ensuring conductivity and mechanical strength, and the silica porosity is 25%-35%; the graphene surface is activated by plasma treatment machine with a power of 50W and a time of 5 minutes to enhance the surface hydrophilicity; and the silica sol is coated and impregnated The pulling method is performed at a speed of 10 mm / min and repeated 3 times; the method is then calcined at a high temperature of 500-600°C in a high temperature sintering furnace for 2 hours, the template is removed, and a porous structure is formed by sintering; the load-bearing layer 122 is a honeycomb permeable concrete structure layer with a porosity of 25%-35%, and the filter layer 123 is an activated carbon fiber filter grid with a pore size of 0.5-2 mm; so that rainwater can pass through smoothly and purify the water; the filter layer 123 is embedded with coated bio-enzyme microcapsules, such as lipase and cellulase, to decompose organic pollutants and delay clogging.

[0026] Furthermore, a plurality of vertical flushing pipes 130 are embedded on one side of the cover 111, one side of the flushing pipe 130 is connected to one side of the seepage box 140, and the other side of the seepage box 140 is provided with a sewage outlet 143 for draining the flushing water of the permeable layer 120; A sealing rod 112 is sleeved between the top ends of the flushing pipes 130, and a snap-in socket 1111 for snapping with the sealing rod 112 is provided on the top surface of one side of the sealing cover 111. When a sprinkler truck or a cleaning vehicle passes through the road intersection, the top ends of the flushing pipes 130 are opened periodically by magnetically attracting the sealing rod 112, and the water pipes are connected to the flushing pipes 130 to supply water, so as to horizontally flush the permeable layer 120.

[0027] Further, such as Figure 5 As shown, in order to prevent small particles of debris from falling into the seepage box 140 from the strip groove of the cover 111, a plurality of water distribution pipes 131 are embedded in the side wall of the flushing pipe 130 at equal intervals, and a plurality of flushing holes 141 corresponding to the plurality of water distribution pipes 131 are opened on the side wall of the seepage box 140 facing the flushing pipe 130, and a drainage groove 142 is opened on the other side of the side wall of the seepage box 140 relative to the flushing holes 141. The drainage groove 142 is located above the drainage port 143 and is not connected; the permeable layer 120 The top surface is flush with the bottom surface of the sewage trough 142; the small particles of debris are supported by the permeable layer 120 to be on the same horizontal plane as the sewage trough 142. When water is pumped out from the water distribution pipe 131 above through the flushing pipe 130, the small particles of debris can be flushed away from the sewage trough 142 and into the sewer; similarly, several water distribution pipes 131 located on one side of the permeable layer 120 pump water to flush it, and the adsorbed substances between the pores of its inner wall are flushed away to achieve the cleaning effect, thereby ensuring that the permeable layer 120 maintains the adsorption and purification functions.

[0028] In addition, in order to ensure that the internal space of the drainage box 140 is in a sealed state, a self-weight bar 160 is rotatably connected between the top and side walls of the sewage trough 142, and the self-weight bar 160 is adapted to be snap-fitted with the sewage trough 142. A self-weight plate 150 is rotatably connected between the top and side walls of the sewage outlet 143, and the self-weight plate 150 is adapted to be snap-fitted with the sewage outlet 143. By embedding weight blocks at the bottom of the self-weight plate 150 and the self-weight bar 160, they are kept in a closed state under the action of their own weight. When the flush pipe 130 is flushed, the self-weight plate 150 and the self-weight bar 160 can be flushed open to discharge waste.

[0029] like Figure 6 and Figure 7 As shown, the regulating and storing group 200 includes a water storage capsule 210 made of elastic polymer material, a main root canal 220 with a diversion function, a plurality of capillary root canals 221 connected to the outside of the bottom of the main root canal 220, and a filler layer 230 arranged in the water storage capsule 210 and expanded into a rectangular parallelepiped; the filler layer 230 is biological ceramsite particles and a slow-release phosphorus removal agent, and the biological ceramsite particles are used to absorb heavy metal ions; The upper and lower parts of the water storage capsule 210 are respectively connected to the drainage box 140 and the main root canals 220. The bottom of the drainage box 140 is clamped with a storage cover 240 for supporting the water storage capsule 210 and the main root canals 220. The expansion deformation of the water storage capsule 210 is used to store rainwater, thereby reducing the pressure of rainwater infiltration to the sewer. The bottom end of the regulating and storing cover 240 is connected with a discharge box 300, which extends along the axial direction of the sewer pipe to expand the space for temporarily storing purified rainwater and relieving the pressure of sewer discharge.

[0030] Furthermore, a plurality of water-permeable holes 144 are provided at equal intervals on the bottom surface of the drainage box 140, and the water storage capsule 210 is made of thermoplastic polyurethane elastomer, with a Shore hardness of 20A-40A and an elongation of ≥300%; the volume of the capsule after expansion is 1.2-2 times that of the compressed state; a plurality of capsule tubes 211 correspondingly sleeved with the plurality of water-permeable holes 144 are provided on the top of the water storage capsule 210, and the plurality of capsule tubes 211 penetrate to the bottom of the water storage capsule 210 and are correspondingly sleeved with the plurality of main root canals 220; Filter membranes are installed at the upper and lower tube openings of the capsule tube 211 to maintain the balance of air pressure inside and outside the capsule; a micro air pump is arranged on the top of the water storage capsule 210 and a pressure plate is sleeved on the shaft end of the micro air pump to squeeze the water storage capsule 210 to drain water; the micro air pump is powered by an external power supply of a roadside lamp pole; a flow rate sensor is set to detect the water flow rate and trigger the micro air pump to actively squeeze out the water inside the water storage capsule 210 to avoid waterlogging; since the water storage capsule 210 has high resilience, when the rain 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 squeezed downward through the capsule tube 211.

[0031] In addition, in order to further store rainwater, the main root canal 220 and several capillary root canals 221 are 3D printed into plant root forms using a polylactic acid-nanoclay complex to increase the water flow contact area and extend the retention time; the surface of the main root canal 220 is coated with a photocatalytic coating, which is composed of The photocatalyst is compounded with graphene quantum dots to improve the photocatalytic efficiency and degrade organic matter under weak light; a fluorescent conversion layer, such as rare earth-doped phosphor, is coated on the bottom of the photocatalytic coating to convert invisible ultraviolet light into visible light, thereby improving the degradation efficiency under low light conditions; the outside of several main root canals 220 is filled with a fixing layer 222, which is a glue layer, used to condense several main root canals 220 and is arranged in a regulating cover 240.

[0032] like Figure 8 As shown, the middle of the top surface of the discharge box 300 is open and a connecting sleeve 310 is provided on the open top surface. The connecting sleeve 310 is adapted and snap-fitted with the bottom port of the regulating cover 240. The bottom surface of the discharge box 300 is connected with a plurality of drain nozzles 320 and a one-way water valve is sleeved inside the drain nozzles 320. Elastic support columns 330 are sleeved on both sides of the discharge box 300. 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 on the bottom end of the guide rod, and a spring sleeved on the outside of 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 start drainage; it automatically drains water after setting the capacity to prevent the discharge box 300 from being filled with water; it is a purely mechanical structure without electronic components and is suitable for harsh environments.

[0033] When the integrated rainwater infiltration and drainage system of the sponge city of the present invention is used, after the rainwater is gathered, a large number of long strips and large-area debris on the road surface are first intercepted by the cover 111 of the infiltration and drainage group 100, and the rainwater flowing into the infiltration and drainage box 140 penetrates through the permeation layer 120 and adsorbs particulate matter; when it penetrates into the water storage capsule 210 in the regulating and storage group 200, it expands and stores 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 is reversely pressed downward to drain into a plurality of main root canals 220, and infiltrates into a plurality of capillary root canals 221, thereby reducing the pressure of rainwater infiltration and drainage to 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 start drainage; the discharge is automatically drained after the capacity is set to prevent the discharge box 300 from being filled with water; it is a purely mechanical structure without electronic components, and is suitable for harsh environments; When a sprinkler truck or a cleaning vehicle passes through a road intersection, the top ends of several flushing pipes 130 are opened periodically through the magnetic sealing rod 112, and the water pipes are connected to several flushing pipes 130 to supply water, so as to horizontally flush the permeable layer 120; when water is passed through the flushing pipes 130 and water is pumped out from the upper water distribution pipes 131, small particles of debris can be flushed away from the sewage trough 142 and into the sewer; similarly, several water distribution pipes 131 located on one side of the permeable layer 120 pump water to flush it, and the adsorbed substances between the pores of its inner wall are flushed away, so as to achieve the cleaning effect and ensure that the permeable layer 120 maintains the adsorption and purification functions.

[0034] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sponge city rainwater infiltration and drainage integrated system, used to replace rainwater grates at road intersections, characterized by: It comprises a seepage drainage group (100), a storage group (200) and a discharge box (300) which are vertically arranged from top to bottom; The drainage group (100) comprises a cover (111) for blocking debris on the road surface, a drainage box (140) arranged below the cover (111), and a permeable layer (120) arranged inside the 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); a plurality 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 a seepage drainage box (140); and a sewage outlet (143) for draining flushing water of the permeable layer (120) is provided on the other side of the seepage drainage box (140); The regulating and storing group (200) comprises a water storage capsule (210) made of elastic polymer material, a plurality of main root canals (220) having a flow-guiding function, and a filler layer (230); a plurality of capillary root canals (221) are connected to the outside of the bottom of each main root canal (220); The packing layer (230) is arranged in 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 drainage box (140) and the plurality of main root canals (220); the bottom end of the drainage box (140) is clamped with a regulating cover (240) for supporting the water storage capsule (210) and the plurality of main root canals (220); the bottom end of the regulating cover (240) is connected to the discharge box (300), and the discharge box (300) extends along the axial direction of the sewer pipe to expand the space.

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

3. The integrated rainwater infiltration and drainage system for sponge cities according to claim 1 is characterized in that: The top surface of the sealing cover (111) is provided with a plurality of strip-shaped grooves in a dot matrix array, the outside of the sealing cover (111) is snap-fitted with a sealing frame (110), the sealing frame (110) is a stepped frame structure, and the top outer side of the drainage box (140) is provided with a convex edge which is snap-fitted with the stepped surface of the sealing frame (110).

4. The integrated rainwater infiltration and drainage system for sponge cities according to claim 1 is characterized in that: The bottom surface of the drainage box (140) is provided with a plurality of water-permeable holes (144) at equal intervals. The water storage capsule (210) is made of thermoplastic polyurethane elastomer. The upper surface of the water storage capsule (210) is provided with a plurality of capsule tubes (211) correspondingly sleeved with the plurality of water-permeable holes (144). The plurality of capsule tubes (211) penetrate the lower surface of the water storage capsule (210) and are correspondingly sleeved with the plurality of main root canals (220). Filter membranes are installed at the upper and lower tube openings of the capsule tubes (211) to maintain the balance of air pressure inside and outside the capsule.

5. The integrated rainwater infiltration and drainage system for sponge cities according to claim 4 is characterized in that: A micro air pump is arranged on 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, and the filler layer (230) is biological ceramsite particles and a slow-release phosphorus removal agent.

6. The integrated rainwater infiltration and drainage system for sponge cities according to claim 1 is characterized by: The main root tube (220) and the capillary root tube (221) are made of a polylactic acid-nanoclay complex and are 3D printed into a plant root system shape; The surface of the main root canal (220) is coated with a photocatalytic coating, and the outside of the main root canal (220) is filled with a fixing layer (222).

7. The integrated rainwater infiltration and drainage system for sponge cities according to claim 6 is characterized by: The photocatalytic coating is composed of The photocatalyst is composited with graphene quantum dots, and a fluorescent conversion layer is coated on the bottom of the photocatalytic coating to convert invisible ultraviolet light into visible light.

8. The integrated rainwater infiltration and drainage system for sponge cities according to claim 1 is characterized by: A sealing rod (112) is sleeved between the top ends of the plurality of flushing pipes (130); a plurality of water distribution pipes (131) are embedded in the side walls of the flushing pipes (130) at equal intervals; a plurality of flushing holes (141) corresponding to and plugged into the plurality of water distribution pipes (131) are provided on the side walls of the seepage and drainage box (140) facing the flushing pipes (130); a sewage drainage groove (142) is provided on the other side of the side wall of the seepage and drainage box (140) relative to the flushing holes (141); the sewage drainage groove (142) is located above the sewage outlet (143) and is not in communication with the sewage outlet (143); and the top surface of the permeable layer (120) is flush with the bottom surface of the sewage drainage groove (142).

9. The integrated rainwater infiltration and drainage system for sponge cities according to claim 8 is characterized by: A self-weight bar (160) is rotatably connected between the top and side walls of the sewage trough (142), and the self-weight bar (160) is adapted to be snap-fitted with the sewage trough (142). A self-weight plate (150) is rotatably connected between the top and side walls of the sewage outlet (143), and the self-weight plate (150) is adapted to be snap-fitted with the sewage outlet (143).

10. The integrated rainwater infiltration and drainage system for sponge cities according to claim 1 is characterized in that: The middle of the top surface of the discharge box (300) is open and a connecting sleeve (310) is provided on the open top surface. The connecting sleeve (310) is adapted to be snap-connected with the bottom port of the regulating cover (240). The bottom surface of the discharge box (300) is connected to a plurality of drainage nozzles (320), and a one-way water valve is sleeved inside the drainage nozzle (320). Elastic support columns (330) are sleeved on both side ends of the discharge box (300).

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