CN113136762A

CN113136762A - Road rainwater recycling system for sponge city construction

Info

Publication number: CN113136762A
Application number: CN202010073982.2A
Authority: CN
Inventors: 张世龙
Original assignee: Shanghai Baichen Environmental Protection Technology Co ltd
Current assignee: Shanghai Baichen Environmental Protection Technology Co ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2021-07-20

Abstract

The invention discloses a road rainwater recycling system for sponge city construction, which comprises a road area and green belt areas arranged on two sides of the road area, wherein a first rainwater recycling module is arranged between the road area and the green belt areas, and a second rainwater recycling module is arranged below the road area. According to the road rainwater recovery and treatment system for sponge city construction, rainwater in the road area is collected, purified and stored through the first rainwater recovery module arranged between the road area and the green belt area and the second rainwater recovery module arranged below the road area, rainwater infiltration speed is increased, rainwater recovery efficiency is guaranteed, purified rainwater is stored in the reuse water tank, the purified rainwater can be used for irrigation of plants in the green belt area through the spray header, and can also be used for flushing toilets, flushing vehicles and fire-fighting water after being conveyed through pipelines, so that water resource shortage is effectively relieved, and the system is green and environment-friendly.

Description

Road rainwater recycling system for sponge city construction

Technical Field

The invention relates to the technical field of urban road construction, in particular to a road rainwater recovery and treatment system for sponge urban construction.

Background

The sponge city is a city which can be like a sponge and has good elasticity in the aspects of adapting to environmental changes, coping with natural disasters and the like, and the sponge city can be used for 'water seepage, water storage and water purification' in rainfall and 'release' and utilize the accumulated water when needed. In recent years, submerged greenbelts, permeable ponds, wet ponds, and the like have been attracting attention and rapidly constructed, and although infiltration of rainwater is accelerated to some extent, it is difficult to achieve an effect of efficiently storing rainwater, purifying and utilizing the rainwater. The urban runoff coefficient is continuously increased due to the continuous increase of the urban hardening area, and a large amount of rainwater runoff generated by strong rainfall can cause surface water accumulation or flood disasters; rainwater may also cause a great amount of soil erosion and runoff pollution, and direct drainage of rainwater into a water body may cause high organic matter load in the water body, reduction in aquatic species, erosion of river beds, and the like. Therefore, the research and development of multifunctional devices and systems capable of efficiently and continuously ensuring rainwater infiltration, storage, purification and recycling are particularly necessary for the construction of sponge cities.

Disclosure of Invention

The invention aims to overcome the defects and provides a road rainwater recovery and treatment system for sponge city construction, rainwater in a road area is collected, purified and stored through a first rainwater recovery module arranged between the road area and a green belt area and a second rainwater recovery module arranged below the road area, rainwater infiltration speed is increased, rainwater recovery efficiency is guaranteed, purified rainwater is stored in a reuse water tank, the purified rainwater can be used for irrigating plants in the green belt area through a spray header, and can also be used for flushing toilets, flushing vehicles and fire fighting water after being conveyed through pipelines, so that water resource shortage is effectively relieved, and the system is green and environment-friendly.

In order to achieve the purpose, the invention provides the following technical scheme that the road rainwater recovery processing system for sponge city construction comprises a road area and green belt areas arranged on two sides of the road area, wherein a first rainwater recovery module is arranged between the road area and the green belt areas, and a second rainwater recovery module is arranged below the road area;

the first rainwater recovery module comprises a ditch body and a water collecting and filtering tank arranged at the bottom of the ditch body, the ditch body is of an inverted ladder-shaped structure, the ditch body and the water collecting and filtering tank are of an integrally formed structure, a primary filter layer A is arranged in the ditch body, a secondary filter layer A and a tertiary filter layer A are sequentially arranged between the bottom of the ditch body and the bottom of an inner cavity of the water collecting and filtering tank from top to bottom, the primary filter layer A is of an arc-shaped structure protruding upwards, and the secondary filter layer A is of an inverted V-shaped structure protruding upwards; a first water outlet is formed in the lower portion of the side wall of the water collecting and filtering tank and is formed below the third-stage filtering layer A;

the second rainwater recovery module comprises a water purification tank and an inclined tube settling tank, the water purification tank is welded on the lower surface of the road area, and the inclined tube settling tank is arranged below the water purification tank; the road area is provided with a water guide port which is communicated with the inner cavity of the purified water tank through a water guide pipeline, a first-stage filter layer B, a second-stage filter layer B, a third-stage filter layer B and a biological filler filter layer are sequentially arranged in the purified water tank from top to bottom, the lower part of the side wall of the purified water tank is provided with a second water outlet, and the second water outlet is arranged below the biological filler filter layer; a sludge collecting hopper is arranged at the bottom of the inclined tube settling tank, a sludge discharging port is arranged at the bottom of the sludge collecting hopper and is communicated with a sludge collecting tank arranged at the bottom of the inclined tube settling tank, one side of the bottom of the sludge collecting tank is fixedly connected with one end of a sludge guide pipe, and a sludge pumping pump is fixedly arranged at the other end of the sludge guide pipe; an inclined pipe support positioned above the sludge collecting hopper is arranged in the inclined pipe settling tank, a hexagonal honeycomb inclined pipe assembly is arranged on the inclined pipe support, overflow ports are formed in the side walls of the inclined pipe settling tank opposite to the green belt area, overflow weir plates communicated with the overflow ports are arranged in the inclined pipe settling tank, and the overflow weir plates are positioned above the inclined pipe support;

the first water outlet is communicated with the inner cavity of the inclined tube settling tank through a first water conveying pipe, and the part of the first water conveying pipe, which is positioned in the inclined tube settling tank, is positioned between the inclined tube bracket and the sludge collecting hopper; the second water outlet is communicated with the inner cavity of the inclined tube settling tank through a second water conveying pipe, and the part of the second water conveying pipe, which is positioned in the inclined tube settling tank, is positioned between the inclined tube bracket and the sludge collecting hopper;

a recycling water tank is arranged on the two sides of the road area and below the green belt area, and a water inlet of the recycling water tank is communicated with an overflow port on the side wall of the inclined tube sedimentation tank opposite to the recycling water tank through a third water conveying pipe; the water recycling device is characterized in that the water recycling water tank is further connected with a water outlet pipe, a water suction pump is connected to the water outlet pipe and extends to the upper portion of the green belt area, and a plurality of spray heads are arranged on the portion, located above the green belt area, of the water outlet pipe.

By adopting the technical scheme, accumulated water on the road surface can quickly enter the water collecting and filtering tank and the purified water tank through the water guide port and the ditch body, rainwater is purified by the water collecting and filtering tank and the purified water tank and then enters the inclined tube settling tank for further treatment, better settling efficiency and settling effect are ensured through the hexagonal honeycomb inclined tube assembly in the inclined tube settling tank, and the rainwater purified by the water collecting and filtering tank, the purified water tank and the inclined tube settling tank is conveyed to the reuse water tank for storage so as to be reused later; the purified rainwater in the reuse water tank is extracted by the water suction pump and sprayed by the spray header, so that the rainwater in the reuse water tank irrigates plants in a green belt area, and the rainwater collected on the road surface can be recycled; the arrangement of the ditch body can ensure that sandy soil in the green belt area is not easy to be washed by rainwater and directly falls into the road area;

a first-stage filter layer A is arranged in the ditch body, a second-stage filter layer A and a third-stage filter layer A are sequentially arranged between the bottom of the ditch body and the bottom of the inner cavity of the water collecting and filtering tank from top to bottom, and rainwater flowing into the ditch body from the greening belt area and the road area sequentially passes through the first-stage filter layer A, the second-stage filter layer A and the third-stage filter layer A and then enters the inclined tube settling tank;

the primary filter layer A is of an arc-shaped structure protruding upwards, the secondary filter layer A is of an inverted V-shaped structure protruding upwards, the arrangement is that sundries in rainwater are accumulated at the joint of the primary filter layer A and the ditch body and the joint of the secondary filter layer A and the side wall of the water collecting filter tank under the action of self gravity and the scouring action, so that the middle positions and positions close to the middle of the primary filter layer A and the secondary filter layer A are not blocked, and the rainwater can smoothly pass through the filter tank; micro impurities and chemical substances in the rainwater can be adsorbed by the biological filler filtering layer, so that the purification effect is better;

mud in the rainwater is collected in collection mud case after handling through the pipe chute setting case, and the silt of getting rid of the rainwater that can be fine through the pipe chute setting case, when the silt of collection mud incasement was filled with, silt pumper can be with taking out silt pump suction to ground.

The road rainwater recycling and treating system for sponge city construction is characterized in that the first-stage filter layer A, the second-stage filter layer A and the third-stage filter layer A are made of stainless steel plates with filter holes, the pore diameter of the filter holes in the first-stage filter layer A is larger than that of the filter holes in the second-stage filter layer A, and the pore diameter of the filter holes in the second-stage filter layer A is larger than that of the filter holes in the third-stage filter layer A.

The road rainwater recovery and treatment system for sponge city construction comprises a first-stage filter layer B, a second-stage filter layer B, a third-stage filter layer B and a third-stage filter layer B, wherein the first-stage filter layer B is a permeable brick layer, the second-stage filter layer B is a fine sand layer, the third-stage filter layer B is a graded gravel layer, and the porosity of the graded gravel layer is smaller than the diameter of the fine sand layer; the biological filler layer consists of biological filter filler and geotextile wrapped outside the biological filter filler.

Through adopting above-mentioned technical scheme, the rainwater on the road surface in road district has further increased the infiltration efficiency on road surface in the water guide mouth gets into the water purification incasement, and the rainwater that gets into the water purification incasement can block great impurity, plays the effect of prefiltering the rainwater through fine sand bed, then passes through the less graded gravel layer of porosity again, reaches the effect of further filtering the rainwater. The biological filler filter layer has low manufacturing cost and long service life, and greatly reduces the maintenance cost of the system.

The road rainwater recovery processing system for sponge city construction is characterized in that the inlet end of the diversion pipeline is provided with a sewage intercepting basket.

Through adopting above-mentioned technical scheme, cut dirty basket and be arranged in filtering the large granule impurity that gets into in the rainwater of pipeline.

Foretell road rainwater recovery processing system for sponge city construction, wherein, mud collecting bucket bottom is equipped with screw conveyer, the mud discharging opening is located screw conveyer's output.

The road rainwater recycling system for sponge city construction comprises a groove body, wherein the groove body is provided with a plurality of grooves, and the inner surface of the groove body is a wave-shaped surface.

The road rainwater recycling system for sponge city construction comprises a street lamp and a solar power supply device, wherein the street lamp is arranged on a green belt area, the solar power supply device comprises a solar cell panel, a photovoltaic charge controller, a storage box and a case, the case is fixed on the green belt area, the photovoltaic charge controller and the storage box are mounted in the case, the solar cell panel is arranged at the top of the street lamp, the output end of the solar cell panel is connected with the input end of the photovoltaic charge controller, the output end of the photovoltaic charge controller is connected with the input end of the storage box, and the storage box is respectively used for supplying power to the street lamp, a sludge pump and a water suction pump.

The solar cell panel converts light energy into electric energy to be stored in the storage battery to supplement the street lamp, the sludge pump and the water pump to consume the electric energy, the green energy is fully utilized to maintain the plants and recover rainwater, and the solar energy street lamp is energy-saving and environment-friendly.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the rainwater collecting and purifying device, rainwater in the road area is collected, purified and stored through the first rainwater recovery module arranged between the road area and the green belt area and the second rainwater recovery module arranged below the road area, so that rainwater infiltration speed is increased, and rainwater recovery efficiency is guaranteed; the rainwater purified by the road rainwater recovery and treatment system for sponge city construction can be used for irrigating plants in greenbelt areas through the spray header and can also be used for flushing toilets, flushing vehicles and fire-fighting water after being conveyed through pipelines, so that the shortage of water resources is effectively relieved, and the system is green and environment-friendly.

2. According to the invention, the primary filter layer A is of an arc-shaped structure protruding upwards, and the secondary filter layer A is of an inverted V-shaped structure protruding upwards, so that sundries in rainwater can be accumulated at the joint of the primary filter layer A and the ditch body and the joint of the secondary filter layer A and the side wall of the water collecting filter tank under the action of self gravity and scouring, the middle positions and positions close to the middle of the primary filter layer A and the secondary filter layer A are not blocked, and the rainwater can smoothly pass through the filter tank.

3. According to the invention, the solar power supply device arranged on the green belt area provides electric energy for the street lamp, the sludge pump and the water pump, so that the green energy is fully utilized to maintain the plants and recover rainwater, and the energy-saving and environment-friendly effects are achieved.

Drawings

Fig. 1 is a schematic structural diagram of a road rainwater recovery processing system for sponge city construction in embodiment 1.

Fig. 2 is a schematic view of the structure of part a in fig. 1.

Fig. 3 is a schematic view of the structure of part B in fig. 1.

Fig. 4 is a schematic view of the structure of the part C in fig. 1.

Fig. 5 is a schematic view of the structure of the portion D in fig. 1.

FIG. 6 is a schematic view showing the structure of the biofiller layer in example 1.

Fig. 7 is a schematic structural view of a road rainwater recycling system for sponge city construction in embodiment 2.

The correspondence between each mark and the part name is as follows:

the device comprises a pipeline area 1, a green belt area 2, a ditch body 3, a water collecting and filtering pool 4, a first-stage filter layer A5, a second-stage filter layer A6, a third-stage filter layer A7, a water purifying tank 8, an inclined tube settling tank 9, a water guide opening 10, a flow guide pipeline 11, a first-stage filter layer B12, a second-stage filter layer B13, a third-stage filter layer B14, a biological filler filter layer 15, a biological filter filler 1501, geotextile 1502, a sludge collecting hopper 16, a sludge discharge opening 17, a sludge collecting tank 18, a sludge guide pipe 19, a sludge pump 20, an overflow weir plate 21, an inclined tube support 22, a hexagonal honeycomb inclined tube assembly 23, a reuse water tank 24, a first water pipe 25, a second water pipe 26, a third water pipe 27, a water outlet pipe 28, a water suction pump 29, a spray header 30, a sewage intercepting basket 31, a spiral conveyor 32, a street lamp 33, a solar cell panel 34, a photovoltaic charging controller 35, an electricity storage box 36 and a case 37.

Detailed Description

In order to make the technical means, the characteristics, the purposes and the functions of the invention easy to understand, the invention is further described with reference to the specific drawings.

Example 1

As shown in fig. 1, 3 and 4, a road rainwater recycling system for sponge city construction comprises a road area 1 and green belt areas 2 arranged at two sides of the road area 1, a first rainwater recycling module is arranged between the road area 1 and the green belt areas 2, and a second rainwater recycling module is arranged below the road area 1.

The first rainwater recycling module comprises a ditch body 3 and a water collecting filter tank 4 arranged at the bottom of the ditch body 3, the ditch body 3 is of an inverted ladder-shaped structure, the ditch body 3 and the water collecting filter tank 4 are of an integrally formed structure, a first-stage filter layer A5 is arranged in the ditch body 3, a second-stage filter layer A6 and a third-stage filter layer A7 are sequentially arranged between the bottom of the ditch body 3 and the bottom of an inner cavity of the water collecting filter tank 4 from top to bottom, the first-stage filter layer A5 is of an arc-shaped structure protruding upwards, and the second-stage filter layer A6 is of an inverted V-shaped structure protruding upwards; the lower part of the side wall of the water collecting and filtering tank 4 is provided with a first water outlet (not shown in the figure), and the first water outlet is arranged below the third-stage filtering layer A7.

The primary filter layer A5 is an upward convex arc-shaped structure, the secondary filter layer A6 is an upward convex inverted V-shaped structure, and the arrangement is to accumulate sundries in rainwater at the joint of the primary filter layer A5 and the ditch body 3 and the joint of the secondary filter layer A6 and the side wall of the water collecting filter tank 4 under the action of self gravity and scouring action so as to ensure that the middle positions and the positions close to the middle positions of the primary filter layer A5 and the secondary filter layer A6 are not blocked and the rainwater can smoothly pass through; the biological filler filter layer 15 can adsorb micro impurities and chemical substances in the rainwater, and the purification effect is better.

The second rainwater recovery module comprises a purified water tank 8 and an inclined tube settling tank 9, the purified water tank 8 is welded on the lower surface of the road area 1, and the inclined tube settling tank 9 is arranged below the purified water tank 8; a water guide port 10 is arranged on the road area 1, the water guide port 10 is communicated with the inner cavity of the purified water tank 8 through a water guide pipeline 11, a first-stage filter layer B12, a second-stage filter layer B13, a third-stage filter layer B14 and a biological filler filter layer 15 are sequentially arranged in the purified water tank 8 from top to bottom, a second water outlet is arranged at the lower part of the side wall of the purified water tank 8, and the second water outlet is arranged below the biological filler filter layer 15; a sludge collecting hopper 16 is arranged at the bottom of the inclined tube settling tank 9, a sludge discharging port 17 is arranged at the bottom of the sludge collecting hopper 16, the sludge discharging port 17 is communicated with a sludge collecting tank 18 arranged at the bottom of the inclined tube settling tank 9, one side of the bottom of the sludge collecting tank 18 is fixedly connected with one end of a sludge guide pipe 19, and the other end of the sludge guide pipe 19 is fixedly provided with a sludge pump 20; the inclined tube settling tank 9 is internally provided with an inclined tube support 22 positioned above the sludge collecting hopper 16, the inclined tube support 22 is provided with a hexagonal honeycomb inclined tube assembly 23, the side wall of the inclined tube settling tank 9 opposite to the green belt area 2 is provided with an overflow port, the inclined tube settling tank 9 is internally provided with an overflow weir plate 21 communicated with the overflow port, and the overflow weir plate 21 is positioned above the inclined tube support 22.

The first water outlet is communicated with the inner cavity of the inclined tube settling tank 9 through a first water conveying pipe 25, and the part of the first water conveying pipe 25, which is positioned in the inclined tube settling tank 9, is positioned between the inclined tube bracket 22 and the sludge collecting hopper 16; the second water outlet is communicated with the inner cavity of the inclined tube settling tank 9 through a second water conveying pipe 26, and the part of the second water conveying pipe 26, which is positioned in the inclined tube settling tank 9, is positioned between the inclined tube bracket 22 and the sludge collecting hopper 16.

A reuse water tank 24 is arranged at the two sides of the road area 1 and below the greenbelt area 2, and the water inlet of the reuse water tank 24 is communicated with an overflow port on the side wall of the inclined tube settling tank 9 opposite to the third water conveying pipe 27; the recycling water tank 24 is also connected with a water outlet pipe 28, the water outlet pipe 28 is connected with a water suction pump 29 and extends to the upper part of the green belt area 2, and the part of the water outlet pipe 28 above the green belt area 2 is provided with a plurality of spray headers 30.

The first-stage filter layer a5, the second-stage filter layer a6 and the third-stage filter layer a7 in this embodiment are all made of stainless steel plates with filter pores, the pore size of the filter pores on the first-stage filter layer a5 is larger than that of the filter pores on the second-stage filter layer a6, and the pore size of the filter pores on the second-stage filter layer a6 is larger than that of the filter pores on the third-stage filter layer a 7.

In the embodiment, the first-stage filter layer B12 is a permeable brick layer, the second-stage filter layer B13 is a fine sand layer, the third-stage filter layer B14 is a graded crushed stone layer, and the porosity of the graded crushed stone layer is smaller than the diameter of the fine sand layer; as shown in fig. 6, the bio-filler layer is composed of a bio-filter filler 1501 and a geotextile 1502 wrapping the bio-filter filler 1501.

Rainwater on the road surface of road district 1 has further increased the infiltration efficiency on road surface in getting into water purification case 8 through leading mouth of a river 10, and the rainwater that gets into in the water purification case 8 can block great impurity, plays the effect of prefiltering rainwater through fine sand bed, then passes through the less graded gravel layer of porosity again, reaches the effect of further filtering the rainwater. The biological filler filter layer 15 has low manufacturing cost and long service life, and greatly reduces the maintenance cost of the system.

As shown in fig. 2, the inlet end of the flow guiding pipeline 11 in this embodiment is provided with a dirt intercepting basket 31. The dirt-catching basket 31 in this embodiment is used for filtering large-particle impurities in rainwater entering the pipeline.

Further, as shown in fig. 5, in the present embodiment, a screw conveyor 32 is provided at the bottom of the mud collection hopper 16, and the mud discharge port 17 is provided at the output end of the screw conveyor 32.

In this embodiment, the inner surface of the groove body 3 is a wavy surface.

The road rainwater recycling system for sponge city construction in the embodiment enables accumulated water on the road surface to rapidly enter the water collecting and filtering tank 4 and the purified water tank 8 through the water guiding port 10 and the ditch body 3, the rainwater is purified through the water collecting and filtering tank 4 and the purified water tank 8 and then enters the inclined tube settling tank 9 for further treatment, better settling efficiency and settling effect are ensured through the hexagonal honeycomb inclined tube assembly 23 in the inclined tube settling tank 9, and the rainwater purified through the water collecting and filtering tank 4, the purified water tank 8 and the inclined tube settling tank 9 is conveyed to the reuse water tank 24 for storage so as to be reused later; the purified rainwater in the reuse water tank 24 is pumped by the water pump 29 and sprayed by the spray header 30, so that the rainwater in the reuse water tank 24 irrigates the plants in the green belt zone 2, and the rainwater collected on the road surface can be reused; the arrangement of the ditch body 3 can ensure that the sandy soil in the green belt area 2 is not easy to be washed by rainwater and directly falls to the road area 1.

Rainwater flowing into the ditch body 3 from the green belt zone 2 and the road zone 1 sequentially passes through the first-stage filter layer A5, the second-stage filter layer A6 and the third-stage filter layer A7 and then enters the inclined tube settling tank 9; rainwater entering the purified water tank 8 through the water guide port 10 sequentially passes through the primary filter layer B12, the secondary filter layer B13, the tertiary filter layer B14 and the biological filler filter layer 15 and then enters the inclined tube settling tank 9; the rainwater purified by the inclined tube settling tank 9 is conveyed into a reuse water tank 24 for storage; the treated rainwater stored in the reuse water tank 24 can be used for irrigating plants in the greenbelt area 2 through the spray header 30, and can also be used for flushing toilets, flushing vehicles and fire-fighting water after being conveyed through pipelines, so that the shortage of water resources is effectively relieved, and the environment is protected.

The mud in the rainwater is collected in mud collection box 18 after being handled through pipe chute setting tank 9, and the silt in the rainwater can be fine got rid of through pipe chute setting tank 9, and when the silt in mud collection box 18 was filled up, silt pumper can be with taking out silt pump 20 to ground.

Example 2

As shown in fig. 7, the structure of the road rainwater recycling system for sponge city construction in this embodiment is different from that in embodiment 1 in that: road rainwater recycling system of sponge city construction in this embodiment still includes street lamp 33 and solar power supply unit, street lamp 33 is located on greenbelt area 2, solar power supply unit includes solar cell panel 34, photovoltaic charge controller 35, accumulator box 36 and quick-witted case 37, machine case 37 is fixed in on greenbelt area 2, photovoltaic charge controller 35 and accumulator box 36 are all installed in quick-witted case 37, solar cell panel 34 locates the street lamp 33 top, solar cell panel 34 output is connected with the input of photovoltaic charge controller 35, the output of photovoltaic charge controller 35 is connected with the input of accumulator box 36, accumulator box 36 is street lamp 33 respectively, take out silt pump 20, suction pump 29 supplies power.

The road rainwater recycling system for sponge city construction in the embodiment converts light energy into electric energy through the solar cell panel 34, and stores the electric energy in the storage battery supplementing street lamp 33, the sludge pump 20 and the water pump 29 for consumption of the electric energy, so that green energy is fully utilized for maintaining plants and recycling rainwater, and the system is energy-saving and environment-friendly.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A road rainwater recycling system for sponge city construction comprises a road area and green belt areas arranged on two sides of the road area, and is characterized in that a first rainwater recycling module is arranged between the road area and the green belt areas, and a second rainwater recycling module is arranged below the road area;

the second rainwater recovery module comprises a water purification tank and an inclined tube settling tank, the water purification tank is welded on the lower surface of the road area, and the inclined tube settling tank is arranged below the water purification tank; a water guide port is arranged on the road area and is communicated with the inner cavity of the purified water tank through a water guide pipeline, a first-stage filter layer B, a second-stage filter layer B, a third-stage filter layer B and a biological filler filter layer are sequentially arranged in the purified water tank from top to bottom, a second water outlet is formed in the lower portion of the side wall of the purified water tank, and the second water outlet is formed below the biological filter filler layer; a sludge collecting hopper is arranged at the bottom of the inclined tube settling tank, a sludge discharging port is arranged at the bottom of the sludge collecting hopper and is communicated with a sludge collecting tank arranged at the bottom of the inclined tube settling tank, one side of the bottom of the sludge collecting tank is fixedly connected with one end of a sludge guide pipe, and a sludge pumping pump is fixedly arranged at the other end of the sludge guide pipe; an inclined pipe support positioned above the sludge collecting hopper is arranged in the inclined pipe settling tank, a hexagonal honeycomb inclined pipe assembly is arranged on the inclined pipe support, overflow ports are formed in the side walls of the inclined pipe settling tank opposite to the green belt area, overflow weir plates communicated with the overflow ports are arranged in the inclined pipe settling tank, and the overflow weir plates are positioned above the inclined pipe support;

2. The road rainwater recycling system for sponge city construction as claimed in claim 1, wherein the first filtering layer a, the second filtering layer a and the third filtering layer a are made of stainless steel plate with filtering holes, the aperture of the filtering hole of the first filtering layer a is larger than that of the filtering hole of the second filtering layer a, and the aperture of the filtering hole of the second filtering layer a is larger than that of the filtering hole of the third filtering layer a.

3. The road rainwater recycling system for sponge city construction as claimed in claim 1, wherein said first filtering layer B is a permeable brick layer, said second filtering layer B is a fine sand layer, said third filtering layer B is a graded crushed stone layer, and the porosity of said graded crushed stone layer is smaller than that of said fine sand layer; the biological filler layer consists of biological filter filler and geotextile wrapped outside the biological filter filler.

4. The system for recycling road rainwater for sponge city construction as claimed in claim 1, wherein the inlet end of the diversion pipeline is provided with a sewage intercepting basket.

5. The system of claim 1, wherein a screw conveyor is arranged at the bottom of the mud collecting hopper, and the mud discharging port is arranged at the output end of the screw conveyor.

6. The system of claim 1, wherein the inner surface of the trench body is a wave-shaped surface.

7. The system as claimed in claim 1, wherein the system further comprises a street lamp and a solar power supply device, the street lamp is disposed on the green belt, the solar power supply device comprises a solar panel, a photovoltaic charge controller, a storage battery box and a case, the case is fixed on the green belt, the photovoltaic charge controller and the storage battery box are both mounted in the case, the solar panel is disposed on the top of the street lamp, the output end of the solar panel is connected with the input end of the photovoltaic charge controller, the output end of the photovoltaic charge controller is connected with the input end of the storage battery box, and the storage battery box respectively supplies power to the street lamp, the sludge pump and the water pump.