CN112939332B

CN112939332B - Sponge urban road rainwater cuts dirty clean system

Info

Publication number: CN112939332B
Application number: CN202110094769.4A
Authority: CN
Inventors: 王家; 张昕健; 谢如意; 马晟; 艾庆华; 赵芳
Original assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2024-02-20
Anticipated expiration: 2041-01-25
Also published as: CN112939332A

Abstract

The application provides a sponge urban road rainwater cuts dirty clean system, it includes permeable pavement, cuts dirty groove, novel subsiding greenbelt and overflow formula inlet for stom water; the both sides of novel formula green land that subsides all are provided with the pavement that permeates water, intercept dirty groove setting in the below of one of them pavement that permeates water between road and novel formula green land, overflow formula inlet for stom water sets up in novel formula green land that subsides. The system has the characteristics of low construction and operation cost, realizes effective control of the initial rainwater runoff non-point source pollution, and has better sewage interception and purification effects on sediment and water quality in the road rainwater runoff.

Description

Sponge urban road rainwater cuts dirty clean system

Technical Field

The application relates to the field of urban sewage treatment, in particular to a rainwater sewage interception and purification system for a sponge urban road.

Background

Urban roads are the central centers of human social progress and economic development, bring great benefit to human society, bring a plurality of negative effects to natural landscapes and ecological systems, serve as an important component of urban water levels, are also one of the main pollution sources of non-point source pollution of urban receiving water bodies, and increasingly attract attention to the problem of runoff pollution caused by urban road rainwater runoff.

The novel sinking green land is constructed by taking the sponge city as the idea, and the novel sinking green land has the functions of improving the rainwater purification, drainage, groundwater supply, saving and the like of the urban green land, changes the traditional water resource management idea, and can effectively reduce the influence and damage to the ecological environment.

With the development of sponge city construction projects for many years, the problems of the novel sinking green land also appear. The novel sunk green land is overlength in water accumulation time, can reduce the survival rate of vegetation, increases gardens maintenance cost, influences district view quality, can make the rainwater quality of water of regulation worsen even, not only can not reach the function of purifying the rainwater, can also influence the health of district resident.

In addition, in some cities in construction, the sediment content in the road rainfall runoff is extremely high, a large amount of sediment and soil inevitably directly enter the novel submerged greenbelt, so that the novel submerged greenbelt loses the original efficacy, and a large amount of pollutants enter a rainwater system and even an surface water body.

Disclosure of Invention

One of the purposes of this application is to provide a sponge urban road rainwater cuts dirty clean system, aims at improving the current novel sinking green land and cuts the relatively poor problem of dirty purification ability.

The technical scheme of the application is as follows:

a rainwater sewage interception and purification system for a sponge urban road comprises a water permeable sidewalk, a sewage interception tank, a novel sinking green land and an overflow type rainwater inlet; the utility model discloses a novel formula green house, including novel formula green house, the pavement that permeates water, novel formula green house's both sides all are provided with permeate water pavement, cut dirty groove setting one of them between road and novel formula green house permeate water pavement's below, overflow formula inlet for stom water set up in the novel formula green house that sinks.

As a technical scheme of this application, the pavement of permeating water has set gradually ground brick layer, well coarse sand screed-coat, geotechnique's cloth layer that permeates water, the concrete layer that permeates water, graded gravel layer and tamp soil layer from top to bottom, graded gravel layer is equipped with the perforation and oozes the pipe, the perforation oozes the pipe and is used for collecting down oozes the rainwater and converges in the novel sunk green space.

As a technical scheme of the application, the sewage interception tank is composed of a water inlet vertical grid, a water outlet vertical grid, a chute and a steel grating plate; the chute is arranged below the permeable pavement; the water inlet vertical grid is arranged on one side of the chute away from the novel sinking green land, and the water outlet vertical grid is arranged on one side of the chute close to the novel sinking green land; the steel grating cover is arranged on the top of the chute and is flush with the pavement of the permeable pavement.

As a technical scheme of the novel sinking green land, the chute gradient is 1% -2% and is inclined to one side close to the novel sinking green land; the space between grids of the water inlet vertical grids is 2-3 cm, and the space between grids of the water outlet vertical grids is 0.5-1 cm; and a curb is arranged on one side of the chute, which is close to the novel sinking green land, and the bottom is filled with permeable concrete.

As a technical scheme of the application, the novel sinking green land is sequentially provided with a plant layer, an improved planting soil layer, a permeable geotechnical cloth layer, a filler layer, an impermeable membrane layer and a rammed soil layer from top to bottom; and a perforated seepage pipe is arranged in the filler layer, and is converged in the overflow type rain water inlet which is communicated with the rain water pipe.

As a technical scheme of this application, the upper end of overflow formula inlet for stom water is equipped with the filtration formula well lid, the cobble has been arranged around the filtration formula well lid.

As a technical scheme of the application, the plant layer is provided with one or more of dwarf lilyturf tuber, shallot, graptopetalum, calamus and canna.

As a technical scheme of the application, the improved planting soil layer is soil obtained by improving the original planting soil by adopting medium coarse sand, the average grain diameter of the medium coarse sand is 0.35-0.5 mm, and the sand doping proportion of the improved planting soil layer is 15-20%.

As a technical scheme of the application, the filler layer comprises graded broken stone and volcanic stone which are uniformly mixed, and the particle size of the volcanic stone is 1-2 cm; the water permeable geotechnical cloth layer is 100-150 g/m ² The method comprises the steps of carrying out a first treatment on the surface of the The pipe diameter of the perforated seepage pipe is phi 120-150, and the aperture ratio is 3%.

The beneficial effects of this application:

in the sponge urban road rainwater sewage interception and purification system, road rainwater silt interception and water quality purification are combined, and runoff rainwater pollution interception and pollution control are promoted by optimizing road drainage design and a novel sinking green land structure. The road drainage form and the novel sinking green land that this application relates to simple structure has the characteristics that construction and running cost are low, has realized the effective control of initial rainwater runoff non-point source pollution, and especially to silt and quality of water cut dirty effect of purifying showing. The system can effectively solve the problem of difficult treatment of the initial rainwater of the source of roads, parks and communities, and has good treatment effect. Simultaneously, intercept dirty groove through setting up between public road and the novel formula green land that sinks to the runoff silt and intercept, the quantity that has significantly reduced silt entering novel formula green land has avoided novel formula green to produce the risk of jam. And moreover, the dirt interception tank is easy to clean, and the workload of later-stage manual maintenance is reduced. The soil after the original planting soil is improved by adopting medium coarse sand through improving the novel sinking green surface layer soil, and the sand mixing proportion is 15% -20%, so that the seepage promotion and emission reduction performances of the soil are improved; the volume weight of the sand-doped soil layer is increased, the porosity is improved, and the soil texture can be changed from loam clay to clay loam, so that the content proportion of soil sand grains, particles and clay grains tends to be moderate; in addition, the maximum water holding capacity of the soil is increased by approximately 20% while the soil hardness is reduced; the filler of graded broken stone and volcanic rock is selected, so that richer grain size grading and richer adsorption space (porosity of the filler) are provided for novel submerged green land purification, meanwhile, the rapid reverse of microorganism groups in the filler is facilitated, the proceeding of biological denitrification, chemical dephosphorization and other processes is promoted, and good conditions are created for realizing better treatment effect. In addition, the system also solves the problems of insufficient water permeability and poor purification effect of the common novel sinking green land, realizes effective control of initial rainwater runoff surface source pollution, and has better water quality purification effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a rainwater sewage interception and purification system for a sponge urban road provided by an embodiment of the application;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a schematic view of a vertical grid for water inlet of a dirt interception tank provided in an embodiment of the present application;

FIG. 5 is a schematic view of a vertical grid for effluent of a dirt trap provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a situation that a sponge urban road rainwater interception and purification system removes TN in a multiple rainfall process provided in an embodiment of the present application;

fig. 7 is a schematic diagram of a situation that a sponge urban road rainwater cuts dirty clean system to remove TP in a multiple rainfall process provided in an embodiment of the present application.

Icon: 1-a permeable pavement; 2-a sewage interception tank; 3-a novel sinking green land; 4-overflow type gully; 5-a water permeable ground brick layer; 6-a middle coarse sand leveling layer; 7-a water permeable geotechnical cloth layer; 8-a permeable concrete layer; 9-grading a crushed stone layer; 10-tamping soil layers; 11-perforating the seepage pipe; 12-a water inlet vertical grid; 13-a vertical grid for water outlet; 14-a chute; 15-steel grating plates; 16-plant layers; 17-improving a planting soil layer; 18-a filler layer; 19-an impermeable film layer; 20-kerb; 21-cobblestone.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the inventive product is conventionally put in use, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.

Furthermore, in this application, unless expressly stated or limited otherwise, a first feature may include first and second features being in direct contact, either above or below, or through additional features being in contact therewith. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Examples:

referring to fig. 1, and referring to fig. 2 to 7 in combination, the application provides a rainwater sewage interception and purification system for a sponge urban road, which comprises a water permeable pavement 1, a sewage interception tank 2, a novel sinking green land 3 and an overflow type rainwater inlet 4; the both sides of novel formula green house 3 all are provided with the pavement 1 that permeates water, intercept dirty groove 2 and set up the below of one of them pavement 1 that permeates water between road and novel formula green house 3, overflow formula inlet for stom water 4 sets up in novel formula green house 3.

The permeable pavement 1 is sequentially provided with a permeable ground brick layer 5, a medium coarse sand leveling layer 6, a permeable geotechnical cloth layer 7, a permeable concrete layer 8, a graded gravel layer 9 and a rammed soil layer 10 from top to bottom, wherein a perforated seepage pipe 11 is arranged in the graded gravel layer 9, and the perforated seepage pipe 11 is used for collecting seepage rainwater and converging the seepage rainwater into a packing layer 18 in the novel sinking green land 3.

The sewage interception tank 2 is composed of a water inlet vertical grid 12, a water outlet vertical grid 13, a chute 14 and a steel grating 15; the chute 14 is arranged below the permeable pavement 1; the water inlet vertical grid 12 is arranged on one side of the chute 14 away from the novel sinking green land 3, and the water outlet vertical grid 13 is arranged on one side of the chute 14 close to the novel sinking green land 3; the steel grating 15 covers the top of the chute 14 and is flush with the pavement of the permeable pavement 1, and the steel grating 15 is easy to open, so that dirt in the dirt intercepting groove 2 can be cleaned manually.

In the present embodiment, the chute 14 has a gradient of 1% to 2% and is inclined to a side close to the new sinking green house 3. Meanwhile, the interval between grids of the water inlet vertical grid 12 is 2-3 cm, and in the embodiment, the interval between grids can be 3cm; the spacing between the grids of the vertical grid 13 for water discharge is 0.5-1 cm, and in this embodiment, the spacing between the grids may be 0.5cm. In addition, a curb 20 is arranged on one side of the chute 14, which is close to the novel sinking green land 3, and the tail end of the sewage interception tank 2 forms an effluent weir by lifting the curb 20, so that sediment, suspended matters and the like with larger particles in the pavement runoff rainwater can be deposited in the sewage interception tank 2. The bottom of the sewage interception tank 2 is filled with pervious concrete, and accumulated water in the chute 14 can also infiltrate downwards and flow to the novel sinking green land 3.

Further, in the present embodiment, the novel sinking green land 3 is provided with a plant layer 16, an improved planting soil layer 17, a permeable geotechnical cloth layer 7, a filler layer 18, an impermeable membrane layer 19 and a rammed soil layer 10 from top to bottom in sequence; the packing layer 18 is internally provided with a perforated seepage pipe 11, the perforated seepage pipe 11 is converged in the overflow type rain water inlet 4, and the overflow type rain water inlet 4 is communicated with a rain water pipe.

Meanwhile, the upper end of the overflow type gully 4 is provided with a filter type well cover, and cobbles 21 are arranged around the filter type well cover.

In this embodiment, the plant layer 16 is provided with one or more of radix Ophiopogonis, herba Alii Fistulosi, herba Graptopetalum, rhizoma Acori Calami, and canna.

In addition, the improved planting soil layer 17 is soil obtained by improving the original planting soil by adopting medium coarse sand, wherein the average grain diameter of the medium coarse sand is 0.35-0.5 mm, and the sand doping proportion of the improved planting soil layer 17 is 15-20%.

Meanwhile, the filler layer 18 comprises graded broken stone and volcanic stone which are uniformly mixed, and the particle size of the volcanic stone is 1-2 cm; the water permeable geotechnical cloth layer 7 is 100-150 g/m ² The method comprises the steps of carrying out a first treatment on the surface of the The pipe diameter of the perforation seepage pipe 11 is phi 120-150, and the aperture ratio is 3%.

The original soil layer needs to be tamped, wherein a sand cushion layer with the thickness of 10cm is paved below a pipeline and a seepage pipe connected with the municipal rainwater well. The elevation of the novel sinking green land 3 is lower than the surrounding ground and the pavement, and the sinking depth is 200mm.

It should be noted that the working principle of the system is as follows:

taking a rainfall process as an example, along with the rainfall, the surface runoff of the road starts to be generated, rainwater is collected to the curb stones 20 on two sides due to the road gradient, and then enters the sewage interception tank 2, the water inlet vertical grid 12 and the water outlet vertical grid 13 arranged in the sewage interception tank 2 can effectively intercept larger impurities in the runoff rainwater, the steel grating 15 is arranged at the top of the sewage interception tank 2 and is in butt joint with a pavement, the function of a pedestrian is guaranteed, and meanwhile, the baffle plate is convenient to be lifted manually to clean dirt in the sewage interception tank 2.

The curb 20 at the tail end of the sewage interception tank 2 is higher than the tank bottom, so that sediment in initial rainwater can be intercepted, and sediment entering the novel sinking green land 3 is reduced. The anti-scour cobbles 21 are arranged at the outlet of the tail end of the dirt interception tank 2, so that impurities in surface runoff rainwater can be further intercepted, and the surface runoff rainwater is convenient to clean.

After entering the novel sinking green land 3, rainwater starts to infiltrate downwards, sequentially passes through the plant layer 16, the improved planting soil layer 17, the permeable geotechnical cloth, the filler layer 18 and the perforated seepage pipe 11, and the rainwater after layer-by-layer seepage and purification is collected through the perforated seepage pipe 11 in the filler layer 18, is discharged into an overflow rainwater inlet, and finally flows to the municipal rainwater well.

The rainwater on the rainfall to the permeable pavement 1 permeates from top to bottom in sequence, namely a permeable ground brick layer 5, a medium coarse sand leveling layer 6, a permeable concrete layer 8 and a graded gravel layer 9, and the layer-by-layer permeated rainwater is collected through a perforation seepage pipe 11 in the graded gravel layer 9 and then is discharged into a packing layer 18 of the novel submerged green land 3, and finally flows to a municipal rainwater well.

Along with the increase of rainfall intensity and the extension of time, the surface runoff volume increases, and a large amount of rainwater gets into novel subsidence greenbelt 3, and the infiltration volume takes place to saturate, and the higher initial stage rainwater of surface runoff earlier stage pollutant concentration has been purified and is accomplished, and comparatively clean rainwater forms ponding at novel subsidence greenbelt 3 surface, can get into the catch basin through the inlet for stom water at overflow inlet for stom water top after ponding to certain altitude, avoids ponding degree of depth too high, influences vegetation and road surface waterlogging.

After rainfall stops, ponding disappears, and the planting soil layer and the packing layer 18 in the novel submerged green land 3 all have certain water storage capacity, so that the conditions that the novel submerged green land 3 is drought and poor in plant growth is caused due to long-term non-rainfall are avoided.

Further, the improved planting soil layer is soil obtained by improving the original planting soil by adopting medium coarse sand, the sand mixing proportion is 20%, and the seepage promoting and emission reducing performances of the soil are improved. The volume weight of the sand-doped soil layer is from 1.84g/cm ³ Reduced to 1.59g/cm ³ The porosity is improved from 8% to 17%, the soil texture is changed from loam clay to clay loam, and the content ratio of sand grains, particles and clay grains of the soil tends to be moderate. The method reduces the soil hardness by 46%, increases the maximum water holding capacity of the soil by approximately 24%, and increases the permeability coefficient and water storage capacity of the soil, so that the planting soil layer is more beneficial to the growth of plants and the enrichment of microorganisms in the soil.

Furthermore, graded broken stone and volcanic rock are selected as improved fillers in the filler layer 18, so that richer grain size grading and more abundant adsorption space are provided for the novel sinking green land 3 purification system, meanwhile, the processes of biological denitrification, chemical dephosphorization and the like are facilitated, and good conditions are created for realizing better treatment effects; in addition, the problems of insufficient water permeability and poor purification effect of the common novel sinking green land 3 are solved, and effective control of initial rainwater runoff surface source pollution is realized.

The system was tested for performance as shown in fig. 6 and 7:

by monitoring the actual treatment effect of the embodiment in the multiple rainfall process, the following results are obtained:

removal of TN by the system:

in the actual rainfall process, the effect of purifying the water quality (TN) by comparing the novel sinking green land 3 in the conventional road drainage with the embodiment is shown in FIG. 6: the fluctuation range of the concentration of TN in the water quality of the inlet water is larger and is about 2-8.5 mg/L. Under the same water inlet condition, the TN concentration of the effluent of the embodiment and the conventional novel sinking green land 3 is respectively 1.3-5.9 mg/L and 0.25-2 mg/L, and the average TN removal rate is respectively 28% and 83.3%.

TN is the total amount of inorganic and organic nitrogen in water in various forms, and is often used to represent the degree of pollution of water by nutrients.

From this, it is clear that this embodiment has a high removal rate for TN, which is mainly attributed to volcanic rock in the filler layer 18, which is porous and porous in the interior and has a large specific surface area. The promotion of denitrification by the filler layer 18 may be derived from the addition of volcanic rock, providing better "anoxic-anaerobic" conditions in the filler layer 18, providing a good environment for nitrification/denitrification.

Second, the system removes the TP:

in the actual rainfall process, the effect of purifying the water quality (TP) of the embodiment and the traditional novel sinking green land 3 is compared, and the data are shown in fig. 7: the novel sinking green land 3 in the embodiment has the best TP removal effect, the average removal rate reaches more than 70 percent, and the average removal rate is improved by about 50 percent compared with the traditional novel sinking green land 3. In the initial rainwater, phosphorus exists mainly in two forms, one of which exists in the form of SS and the other exists in the form of organic phosphorus. The self-cleaning capability of the phosphorus in the water body is low, and the phosphorus in the water body is generally removed mainly through adsorption, biological phosphorus removal, chemical precipitation and other approaches. The filler selected in the embodiment is graded broken stone and volcanic rock, so that the adsorption effect of the volcanic rock on phosphorus is greatly higher than that of the traditional broken stone, the porosity is also larger, the aggregation of organisms is promoted, and the biological phosphorus removal effect is indirectly enhanced.

TP refers to the measurement result of various forms of phosphorus converted into orthophosphate after a water sample is digested, and the measurement result is measured in milligrams of phosphorus per liter of water sample.

In summary, in the sponge urban road rainwater interception and purification system, road rainwater silt interception and water purification are combined, and runoff rainwater pollution interception and pollution control are promoted by optimizing road drainage design and a novel sinking green land 3 structure. The road drainage form and the novel sinking green land 3 that this application relates to simple structure has the characteristics that construction and running cost are low, has realized the effective control of initial stage rainwater runoff non-point source pollution, and especially to silt and quality of water cut dirty effect of purifying showing. The system can effectively solve the problem of difficult treatment of the initial rainwater of the source of roads, parks and communities, and has good treatment effect. Simultaneously, intercept dirty groove 2 that cuts that sets up between public road and novel sunken greenbelt 3 is to the runoff silt, the quantity that has significantly reduced silt entering novel sunken greenbelt 3 has avoided novel sunken greenbelt 3 to produce the risk of jam. In addition, the dirt interception tank 2 is easy to clean, and the workload of later-stage manual maintenance is reduced. The soil after the original planting soil is improved by adopting the medium coarse sand through improving the novel sinking green land 3 surface layer soil, and the sand mixing proportion is 15% -20%, so that the seepage promotion and emission reduction performances of the soil are improved; the volume weight of the sand-doped soil layer is increased, the porosity is improved, and the soil texture can be changed from loam clay to clay loam, so that the content proportion of soil sand grains, particles and clay grains tends to be moderate; in addition, the maximum water holding capacity of the soil is increased by approximately 20% while the soil hardness is reduced; the filler of graded broken stone and volcanic rock is selected, so that richer grain size grading and richer adsorption space (porosity of the filler) are provided for purifying the novel sinking green land 3, meanwhile, the rapid reverse of microorganism groups in the filler is facilitated, the proceeding of biological denitrification, chemical dephosphorization and other processes is promoted, and good conditions are created for realizing better treatment effect. In addition, the system also solves the problems of insufficient 3 water permeability and poor purification effect of the common novel sinking green land, realizes effective control of initial rainwater runoff surface source pollution, and has better water quality purification effect.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. The rainwater dirt interception and purification system for the sponge urban road is characterized by comprising a permeable sidewalk, a dirt interception groove, a novel sinking green land and an overflow type rainwater inlet; the novel sinking green land is characterized in that the water permeable sidewalk is arranged on two sides of the novel sinking green land, the dirt intercepting groove is arranged below one of the water permeable sidewalk between the road and the novel sinking green land, and the overflow type water inlet is arranged in the novel sinking green land; the sewage interception groove is formed by a water inlet vertical grid, a water outlet vertical grid, a chute and a steel grid plate; the chute is arranged below the permeable pavement; the water inlet vertical grid is arranged on one side of the chute away from the novel sinking green land, and the water outlet vertical grid is arranged on one side of the chute close to the novel sinking green land; the steel grating cover is arranged on the top of the chute and is flush with the pavement of the permeable pavement; the chute gradient is 1% -2% and is inclined to one side close to the novel sinking green land; the space between grids of the water inlet vertical grids is 2-3 cm, and the space between grids of the water outlet vertical grids is 0.5-1 cm; and a curb is arranged on one side of the chute, which is close to the novel sinking green land, and the bottom is filled with permeable concrete.

2. The sponge urban road rainwater interception and purification system according to claim 1, wherein the permeable pavement is sequentially provided with a permeable ground brick layer, a medium coarse sand leveling layer, a permeable geotechnical cloth layer, a permeable concrete layer, a graded gravel layer and a rammed soil layer from top to bottom, wherein the graded gravel layer is provided with a perforated seepage pipe, and the perforated seepage pipe is used for collecting the infiltration rainwater and converging the infiltration rainwater into the novel sinking green land.

3. The sponge urban road rainwater intercepting and purifying system according to claim 1, wherein the novel sinking green land is sequentially provided with a plant layer, an improved planting soil layer, a permeable geotechnical cloth layer, a filler layer, an impermeable membrane layer and a rammed soil layer from top to bottom; and a perforated seepage pipe is arranged in the filler layer, and is converged in the overflow type rain water inlet which is communicated with the rain water pipe.

4. The sponge urban road rainwater intercepting and purifying system according to claim 3, wherein the upper end of the overflow type gully is provided with a filtering type well cover, and cobbles are arranged around the filtering type well cover.

5. A sponge urban road rainwater intercepting and purifying system according to claim 3, wherein said plant layer is provided with one or more of the group comprising ophiopogon root, allium fistulosum, graptopetalum, calamus, canna.

6. The sponge urban road rainwater sewage interception and purification system according to claim 3, wherein the improved planting soil layer is soil obtained by improving original planting soil by adopting medium coarse sand, the average grain diameter of the medium coarse sand is 0.35-0.5 mm, and the sand doping proportion of the improved planting soil layer is 15-20%.

7. The sponge urban road rainwater sewage interception and purification system according to claim 3, wherein the filler layer comprises graded broken stone and volcanic stone which are uniformly mixed, and the particle size of the volcanic stone is 1-2 cm; the water permeable geotechnical cloth layer is 100-150 g/m ² The method comprises the steps of carrying out a first treatment on the surface of the The pipe diameter of the perforated seepage pipe is phi 120-150, and the aperture ratio is 3%.