A greening rainwater collection system and construction method for sponge cities

Abstract

The invention discloses a greening rainwater collection system and a construction method for a sponge city, which relate to the technical field of building engineering, and include a greening rainwater collection unit, a filtering unit and a storage unit, as well as a reuse unit and an intelligent control unit, which are sequentially laid in layers from the surface to the underground; the greening rainwater collection unit utilizes plant roots to fix flow and purify water, and collects rainwater from sidewalks, thereby improving the rainwater collection efficiency and water storage capacity of urban greening areas, while reducing urban waterlogging and runoff pollution; the filtering unit and the storage unit guide water to flow to a deep layer, thereby reducing surface runoff; the reuse unit optimizes rainwater collection, storage and utilization through greening irrigation, non-drinking water utilization and overflow discharge; the intelligent control unit reasonably controls water storage and water distribution based on weather forecasts and historical data, thereby ensuring that the water level of the storage unit is not lower than the minimum water level; the system can guide drainage or water storage during the rainy season, thereby solving the problem of urban waterlogging caused by heavy rains.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a greening rainwater collection system for a sponge city and a construction method. Background Art

[0002] The sponge city rainwater collection system is a method that combines natural means and artificial measures to effectively manage and utilize urban rainfall to reduce flood disasters and improve the quality of the urban ecological environment. The core technology of this rainwater collection system is to compare the city to a "big sponge" that can absorb and store rainwater during rainfall and release and utilize it when needed. The collection system can collect rainwater through several main parts:

[0003] 1. Permeable pavement: By using permeable materials, such as permeable concrete, permeable bricks, etc., the permeability of the ground is increased so that rainwater can quickly penetrate into the ground.

[0004] 2. Green roofs and walls: Planting plants on the roofs and walls of buildings can absorb and store rainwater, while also playing a role in cooling and beautifying the environment.

[0005] 3. Rain gardens and bioretention facilities: Design special low-lying areas and green spaces to collect and filter rainwater, reduce runoff and improve water quality.

[0006] 4. Rainwater collection system: By setting up rainwater pipes, reservoirs and other facilities, rainwater from roofs, roads, etc. is collected and stored for non-drinking purposes such as irrigation, flushing toilets, and cleaning.

[0007] 5. Ecological waterways and wetlands: Build artificial waterways and wetlands to regulate and purify rainwater, while providing the city with good ecological landscape and biological habitat.

[0008] Through these rainwater collection parts, the sponge city rainwater collection system can not only effectively deal with urban flooding caused by heavy rains, or improve the water use and microclimate of cities with low annual precipitation, increase the area of ​​urban green space, improve the efficiency of water resource utilization, and improve the quality of life of residents.

[0009] To sum up, in order to solve the problem of urban waterlogging caused by heavy rain, it is necessary to design a green rainwater collection system for sponge cities to collect rainwater, and use rainwater for non-drinking or non-food cleaning purposes, reduce the amount of drinking water used for non-drinking purposes, improve water resource utilization efficiency, and achieve water conservation. Summary of the invention

[0010] The purpose of the present invention is to provide a greening rainwater collection system and construction method for sponge cities to solve the problem of urban waterlogging caused by heavy rains;

[0011] The various technical effects that can be produced by the preferred technical solutions among the various technical solutions provided by the present invention are described in detail below.

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0013] The present invention provides a greening rainwater collection system for a sponge city, comprising a greening rainwater collection unit, a filtering unit and a storage unit which are sequentially laid in layers from the surface to the underground; as well as a reuse unit and an intelligent control unit; the greening rainwater collection unit is used to increase the rainwater collection and water storage capacity of green belts and sidewalks in the city during the rainy season; the combination of the filtering unit and the storage unit is used to guide water to flow to a deep layer, reduce the surface runoff of green belts and sidewalks, and at the same time, the greening rainwater collection unit uses plant roots to fix soil and debris and purify water, thereby improving the utilization rate of rainwater and reducing runoff pollution; the reuse unit comprises a greening irrigation mechanism, a non-drinking water utilization mechanism and an overflow discharge mechanism, and uses rainwater for greening irrigation, or non-drinking use, or discharge; the combination of the intelligent control unit is used to comprehensively judge the rainy season or the dry season according to weather forecasts and weather data in previous years, and reasonably distribute the water stored in the storage unit to the reuse unit to ensure that the annual water level of the storage unit is not lower than the lowest water level.

[0014] In one of the embodiments, the greening rainwater collection unit includes a green belt water collection area and a sidewalk water collection area; the green belt water collection area is provided with a planting layer and a permeable layer in sequence; wherein the planting layer utilizes the vegetation on the surface of the green space to increase the absorption capacity and the collection amount of rainwater, and the multi-layer soil provided in the planting layer is used to increase the infiltration amount of rainwater and form primary infiltration and primary filtration; the permeable layer is laid below the planting layer and erected above the filtration unit, and the permeable layer is paved with permeable concrete, or a concrete frame with permeable bricks, and is used to collect the infiltrated rainwater and then filter and infiltrate it for the second time through the paved permeable concrete or permeable bricks, and then enter the filtration unit to thereby Enhance the rainwater infiltration, convergence and filtration effects; the sidewalk water collection area is sequentially provided with permeable bricks and convergence culverts from the surface to the underground; wherein the convergence culvert is constructed in a Z-shaped path, and the channel ground of the convergence culvert is provided with a drainage slope inclined from the surface to the underground, which is used to utilize the culvert with a Z-shaped path so that the rainwater falling into the culvert, when flowing, enters the corner of the culvert to form a local vortex, and carries away the silt flowing into the culvert, avoiding the accumulation of silt and weakening the cross-sectional flow rate of the convergence culvert; a single permeable brick is laid across two parallel culverts, which is used to disperse the rainfall of a single permeable brick entering the culvert, so that the rainfall on the culvert path is balanced and flows continuously, continuously carrying away the silt flowing into the culvert, avoiding the accumulation of silt.

[0015] In one embodiment, the planting layer includes, from top to bottom, a vegetation layer of a mixture of lawns and shrubs, an organic soil layer, a middle soil layer, a gravel layer and a water-filtration carbon layer, and the water-filtration carbon layer is directly laid on the permeable layer; a nylon mesh is sandwiched in the water-filtration carbon layer to enhance the fixation of the water-filtration carbon.

[0016] In one embodiment, the organic soil layer is a mixture of plant fallen leaves, plant stems, kitchen waste, pumice and rice grains.

[0017] In one of the embodiments, the filtration unit includes a filter tank, a coarse filter screen, a fine filter screen, a sand filter core layer, a cleaning nozzle, a sludge discharge pipe and a first flow meter; in the vertical height of the filter tank, the water inlet of the filter tank is arranged in the middle, the sewage outlet is arranged at the bottom, and the water outlet is arranged between the water inlet and the top of the tank; the water inlet is connected to the confluence of the confluence culvert and the permeable layer; the sewage outlet is connected to the sludge discharge pipe; the coarse filter screen, the fine filter screen and the sand filter core layer are arranged in sequence from the water inlet direction to the water outlet direction, and the multi-stage filtration arranged in the filter tank is used for the third filtration of the collected rainwater, mainly filtering out the silt brought by the rainwater in the sidewalk catchment area and the green belt catchment area, to ensure that the silt and other impurities are not Entering into the storage unit; the cleaning nozzle is connected to the cleaning water pump of the recycling unit; the first flow meter is installed at the water inlet of the filter pool and is electrically connected to the intelligent control unit; a plurality of the cleaning nozzles are arranged on the top of the filter pool and are divided into three groups, each group corresponds to spraying and cleaning the water-facing surfaces of the coarse filter screen, the fine filter screen and the sand filter element layer; by setting the cleaning nozzles and the sludge discharge pipe, the intelligent control unit judges and records the filtered water volume according to the water intake data collected by the first flow meter, and when the set filtered water volume value range is reached, the cleaning water pump is controlled to supply water, and the coarse filter screen, the fine filter screen and the sand filter element layer are regularly cleaned to ensure the filtration efficiency of the filter pool and efficient operation.

[0018] In one embodiment, there are three sewage outlets, and their positions are as follows: the first sewage outlet is arranged between the water inlet of the filter tank and the coarse filter screen, the second sewage outlet is arranged between the coarse filter screen and the fine filter screen, and the third sewage outlet is arranged between the fine filter screen and the sand filter element layer.

[0019] In one embodiment, the storage unit includes an underground water reservoir; the intelligent control unit includes an above-ground machine room; the underground water reservoir is connected to the water outlet of the filter tank, and the cleaning water pump of the recycling unit is connected to the underground water reservoir; the underground water reservoir is composed of a concrete cast frame, and the inner wall is coated with anti-seepage material, which is used to withstand the load pressure on the ground and store rainwater for a long time without leakage; a removable grille is arranged on the top of the underground water reservoir, and an artificial passage is arranged in the above-ground machine room to connect to the grille on the top of the underground water reservoir, so as to facilitate manual entry for cleaning and maintenance.

[0020] In one embodiment, the greening irrigation mechanism includes a first water pump and an irrigation pipe, the first water pump is connected to the underground water reservoir and the irrigation pipe; the non-drinking water utilization mechanism includes a second water pump and the cleaning water pump, the second water pump is connected to the underground water reservoir and the pipe of the public toilet, and the second water pump is used to provide flushing water to the public toilet; the overflow discharge mechanism includes a third water pump, a first discharge pipe and a second discharge pipe, the third water pump is connected to the underground water reservoir, the first discharge pipe and the second discharge pipe, the first discharge pipe is connected to the municipal sewer, the second discharge pipe is connected to the river or the artificial lake, and the overflow discharge mechanism is used to discharge the overflow water of the underground water reservoir to the municipal sewer, or the river, or the artificial lake, and to inject water into the river or the artificial lake when it is dry.

[0021] In one embodiment, the intelligent control unit includes a water level meter and a controller; the controller, the cleaning water pump, the first water pump, the second water pump and the third water pump are all installed in the above-ground machine room; the water level meter is arranged in the underground water reservoir and electrically connected to the controller, for measuring the water level of the underground water reservoir and recording water level data; the controller is electrically connected to the first flow meter; the controller is connected to the network to receive and record weather data, and at the same time monitors the rainwater infiltration and storage volume in real time through the first flow meter and the water level meter, automatically controls the operation of the cleaning water pump, the first water pump, the second water pump and the third water pump, controls and distributes water consumption, and analyzes the water inlet data collected by the first flow meter and the water level data collected by the water level meter in combination with weather data to optimize water distribution.

[0022] A construction method of a greening rainwater collection system for a sponge city is also provided, comprising the following steps:

[0023] S1. Site preparation;

[0024] S1.1. Level and compact the construction site to ensure the stability of the foundation;

[0025] S1.2. Plan the location and area of ​​the planting layer and permeable layer, and determine the location of the underground water reservoir and the location of the above-ground machine room;

[0026] S2, installation of each unit;

[0027] S2.1. First, dig the pit of the water storage tank, pour the underground water storage tank and carry out anti-seepage treatment, install the water level meter, and reserve the pipeline;

[0028] S2.2, pour the filter tank, install the coarse filter screen, fine filter screen, sand filter core layer, cleaning nozzle, sludge discharge pipe and the first flow meter, and reserve pipelines;

[0029] S2.3. Lay the permeable layer and the planting layer in sequence, ensuring that the layers are closely connected to form a green belt water collection area; pour or build a confluence culvert, and lay permeable bricks to form a sidewalk water collection area; the permeable layer and the confluence culvert meet at the confluence port, and the filter tank is connected to the confluence port;

[0030] S2.4, connecting pipes and circuits of each unit;

[0031] S3. Debugging and acceptance

[0032] S3.1. After installation, perform system debugging to ensure the normal operation of each unit;

[0033] S3.2. Conduct rainwater collection and filtration purification tests to check the actual effect and performance of the system;

[0034] S3.3. After passing the acceptance, it will be officially put into use and regularly maintained.

[0035] The beneficial effects of the present invention are as follows:

[0036] The greening rainwater collection system for sponge cities is equipped with greening rainwater collection units, filtration units and storage units that are laid out in layers from the surface to the underground; as well as reuse units and intelligent control units, which realize the efficient collection, management and utilization of rainwater resources, effectively deal with the problem of urban waterlogging caused by heavy rains, and can also solve the water use difficulties of cities with low precipitation throughout the year by collecting and storing rainwater across seasons.

[0037] First of all, the setting of greening rainwater collection units can significantly improve the rainwater collection efficiency of urban green belts and sidewalks during the rainy season. Through reasonable structural design, rainwater on green belts and sidewalks can be quickly collected and directed to the filtration units and storage units located underground. It can also relieve the pressure on the urban drainage system during the rainy season and reduce the risk of waterlogging; at the same time, the plant roots in the green belt play an important role in the rainwater collection process, which can fix soil and debris and filter and purify water quality, reduce the pollutant content in rainwater runoff, and improve the quality of the urban environment.

[0038] Secondly, the combined design of the filtration unit and the storage unit allows rainwater to flow to the deep areas below the surface, reducing surface runoff from green areas and sidewalks. This design not only helps control the speed of rainwater runoff and reduce the impact of surface runoff on the urban drainage system, but also effectively stores more rainwater in the underground storage unit, improving the utilization rate of water resources. The filtration unit performs deep filtration and purification on the collected rainwater to ensure that the water quality stored in the storage unit meets the reuse standards, providing water quality guarantee for subsequent rainwater utilization.

[0039] The reuse unit includes a greening irrigation mechanism, a non-drinking water utilization mechanism and an overflow discharge mechanism, which realizes the multi-channel and efficient utilization of rainwater resources. The stored rainwater can be used for urban greening irrigation through the greening irrigation mechanism, reducing dependence on municipal water supply and saving water resources. The purified rainwater can also be used for non-drinking purposes, such as flushing water supply for public toilets, road cleaning water supply, vehicle washing water supply, etc., further improving the utilization efficiency of water resources. When the water storage exceeds the capacity of the storage unit, the overflow discharge mechanism can safely discharge excess rainwater into rivers or artificial lakes to prevent water accumulation on urban roads.

[0040] The introduction of the intelligent control unit makes the entire system more intelligent and automated. By combining weather forecasts and historical weather data, the intelligent control unit can reasonably allocate water consumption in rainy and dry seasons to ensure that the water level of the storage unit is not lower than the minimum water level all year round. This not only optimizes the use of rainwater, but also ensures that the city can use the remaining minimum water level storage during droughts to meet the water demand for green irrigation. The intelligent control system can monitor water levels and rainfall collection data in real time, realize automated management, reduce manual intervention, and improve the operating efficiency and reliability of the system.

[0041] In summary, the greening rainwater collection system for sponge cities of the present invention realizes the efficient collection, purification and reuse of rainwater resources through systematic and intelligent design, and effectively solves the problems of urban waterlogging and water use. The system can significantly reduce the pressure on the urban drainage system and reduce the risk of waterlogging in the rainy season. At the same time, it can provide a stable source of non-drinking water in the dry season to ensure the irrigation and non-drinking water needs of urban greening, which has important practical significance for the sustainable development of cities. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0044] The reference numerals are as follows:

[0045] 1. Greening rainwater collection unit; 11. Confluence;

[0046] 2. Green belt water catchment area; 21. Planting layer; 22. Permeable layer;

[0047] 3. Pedestrian water catchment area; 31. Permeable bricks; 32. Converging culverts;

[0048] 4. Filter unit; 41. Filter tank; 411. Water inlet; 412. Sewage outlet; 413. Water outlet; 42. Coarse filter screen; 43. Fine filter screen; 44. Sand filter element layer; 45. Cleaning nozzle; 46. Sludge discharge pipe; 47. First flow meter;

[0049] 5. Storage unit; 51. Underground reservoir; 52. Artificial passage;

[0050] 6. Reuse unit; 61. Greening irrigation mechanism; 611. First water pump; 612. Irrigation pipe; 62. Non-drinking water utilization mechanism; 621. Second water pump; 622. Cleaning water pump; 623. Toilet water supply pipe; 63. Overflow discharge mechanism; 631. Third water pump; 632. First discharge pipe; 633. Second discharge pipe;

[0051] 7. Intelligent control unit; 71. Water level meter; 72. Controller; 73. Ground machine room. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0053] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] A specific embodiment provides a greening rainwater collection system and construction method for a sponge city, which enables the collected rainwater to be used for non-drinking or non-food cleaning purposes, reduces the amount of drinking water used for non-drinking purposes, improves the efficiency of water resource utilization, achieves the economical use of water resources, and effectively solves the problem of urban waterlogging caused by heavy rains.

[0055] Hereinafter, embodiments will be described with reference to the drawings. Note that all contents of the configurations shown in the following embodiments are not necessarily required as the solution to the invention described in the claims.

[0056] The first implementation of a green rainwater collection system for sponge cities Figure 1 As shown, it includes a greening rainwater collection unit 1, a filtering unit 4 and a storage unit 5 which are laid in layers from the surface to the underground; as well as a reuse unit 6 and an intelligent control unit 7; the greening rainwater collection unit 1 is used to increase the rainwater collection and water storage capacity of the green belts and sidewalks in the city during the rainy season; the combination of the filtering unit 4 and the storage unit 5 is used to guide the water to flow to the deep layer, reduce the surface runoff of the green belts and sidewalks, and at the same time, the greening rainwater collection unit 1 uses the plant roots to fix soil and debris and purify water, thereby improving the utilization rate of rainwater and reducing runoff pollution; the reuse unit 6 includes a greening irrigation mechanism 61, a non-drinking water utilization mechanism 62 and an overflow discharge mechanism 63, which uses rainwater for greening irrigation, or non-drinking use, or discharge; the combination of the intelligent control unit 7 is used to comprehensively judge the rainy season or the dry season according to the weather forecast and the weather data of previous years, and reasonably allocate the amount of water stored in the storage unit 5 to the reuse unit 6 to ensure that the annual water level of the storage unit 5 is not lower than the minimum water level.

[0057] The setting up of green rainwater collection system for sponge city has realized the efficient collection, management and utilization of rainwater resources, effectively dealt with the problem of urban waterlogging caused by heavy rains, and can also solve the water shortage problem in cities with low precipitation throughout the year by collecting and storing rainwater.

[0058] First, the setting of the greening rainwater collection unit 1 can significantly improve the rainwater collection efficiency of urban green belts and sidewalks during the rainy season. Through reasonable structural design, rainwater on green belts and sidewalks can be quickly collected and guided to the filtering unit 4 and storage unit 5 located underground. It can also relieve the pressure on the urban drainage system during the rainy season and reduce the risk of waterlogging; at the same time, the plant roots in the green belt play an important role in the rainwater collection process, which can fix soil and debris and filter and purify water quality, reduce the pollutant content in rainwater runoff, and improve the quality of the urban environment.

[0059] Secondly, the combined design of the filtration unit 4 and the storage unit 5 allows rainwater to flow to the deep area below the surface, reducing the surface runoff of green areas and sidewalks. This design not only helps to control the speed of rainwater runoff and reduce the impact of surface runoff on the urban drainage system, but also effectively stores more rainwater in the underground storage unit 5, thereby improving the utilization rate of water resources. The filtration unit 4 performs deep filtration and purification on the collected rainwater to ensure that the water quality stored in the storage unit 5 meets the reuse standards, thus providing water quality guarantee for subsequent rainwater utilization.

[0060] The reuse unit 6 includes a greening irrigation mechanism 61, a non-drinking water utilization mechanism 62 and an overflow discharge mechanism 63, which realizes the multi-channel and efficient utilization of rainwater resources. The stored rainwater can be used for urban greening irrigation through the greening irrigation mechanism 61, reducing the dependence on municipal water supply and saving water resources. The purified rainwater can also be used for non-drinking purposes, such as flushing water supply for public toilets, road cleaning water supply, vehicle washing water supply, etc., further improving the utilization efficiency of water resources. When the water storage capacity exceeds the capacity of the storage unit 5, the overflow discharge mechanism 63 can safely discharge excess rainwater into a river or an artificial lake to prevent water accumulation on urban roads.

[0061] The introduction of the intelligent control unit 7 makes the entire system more intelligent and automated. By combining weather forecasts and historical weather data, the intelligent control unit 7 can reasonably allocate water consumption in the rainy and dry seasons to ensure that the water level of the storage unit 5 is not lower than the minimum water level all year round. This not only optimizes the use of rainwater, but also ensures that the city can use the remaining minimum water level storage water during droughts to meet the water demand for green irrigation. The intelligent control system can monitor the water level and rainfall collection data in real time, realize automatic management, reduce manual intervention, and improve the operating efficiency and reliability of the system.

[0062] In summary, the greening rainwater collection system for sponge cities of the present invention realizes the efficient collection, purification and reuse of rainwater resources through systematic and intelligent design, and effectively solves the problems of urban waterlogging and water use. The system can significantly reduce the pressure on the urban drainage system and reduce the risk of waterlogging in the rainy season. At the same time, it can provide a stable source of non-drinking water in the dry season to ensure the irrigation and non-drinking water needs of urban greening, which has important practical significance for the sustainable development of cities.

[0063] As an optional implementation method, Figure 1 As shown, it is a schematic diagram of the structure of each unit and a partial schematic diagram of some pipelines.

[0064] Regarding the specific composition and structure of the above-mentioned greening rainwater collection unit 1, this embodiment is as follows: Figure 1As shown, the greening rainwater collection unit 1 includes a green belt water collection area 2 and a sidewalk water collection area 3; the green belt water collection area 2 is sequentially provided with a planting layer 21 and a permeable layer 22; wherein, the planting layer 21 utilizes the vegetation on the surface of the green space to increase the absorption capacity and the convergence amount of rainwater, and the multi-layer soil provided in the planting layer 21 is used to increase the infiltration amount of rainwater and form primary infiltration and primary filtration; the permeable layer 22 is laid below the planting layer 21 and is erected above the filtering unit 4, and the permeable layer 22 is made of permeable concrete or a concrete frame with permeable bricks 31, which is used to collect the infiltrated rainwater and then filter and infiltrate it for the second time through the permeable concrete or permeable bricks 31, and then enter the filtering unit 4 to enhance the rainwater Infiltration, confluence and filtration effects; the sidewalk water collection area 3 is sequentially provided with permeable bricks 31 and confluence culverts 32 from the surface to the underground; wherein the confluence culvert 32 is constructed in a Z-shaped path, and the confluence culvert 32 is provided with a drainage slope inclined from the surface to the underground, so as to utilize the culvert with a Z-shaped path, so that the rainwater falling into the culvert, when flowing, enters the corner of the culvert to form a local vortex, and carries away the silt flowing into the culvert, so as to avoid the accumulation of silt and weaken the cross-sectional flow of the confluence culvert 32; a single permeable brick 31 is laid across two parallel culverts, so as to disperse the rainfall of a single permeable brick 31 entering the culvert, so that the rainfall on the culvert path is balanced and flows continuously, and the silt flowing into the culvert is continuously carried away, so as to avoid the accumulation of silt.

[0065] The planting layer 21 includes, from top to bottom, a vegetation layer of a mixture of lawns and shrubs, an organic soil layer, a middle soil layer, a gravel layer and a water-filtration carbon layer, and the water-filtration carbon layer is directly laid on the permeable layer 22; a nylon mesh is sandwiched in the water-filtration carbon layer to enhance the fixation of the water-filtration carbon.

[0066] In order to construct the nutrient soil layer for vegetation, the organic soil layer is mixed with plant fallen leaves, plant stems, kitchen waste, pumice and rice grains.

[0067] Regarding the specific composition and structure of the above-mentioned filtering unit 4, this embodiment is as follows: Figure 1As shown, the filter unit 4 includes a filter pool 41, a coarse filter screen 42, a fine filter screen 43, a sand filter core layer 44, a cleaning nozzle 45, a sludge discharge pipe 46 and a first flow meter 47; in the vertical height of the filter pool 41, the water inlet 411 of the filter pool 41 is arranged in the middle, the sewage outlet 412 is arranged at the bottom, and the water outlet 413 is arranged between the water inlet 411 and the top of the pool; the water inlet 411 is connected to the confluence 11 of the confluence culvert 32 and the permeable layer 22; the sewage outlet 412 is connected to the sludge discharge pipe 46; the coarse filter screen 42, the fine filter screen 43 and the sand filter core layer 44 are arranged in sequence from the water inlet direction to the water outlet direction, and the multi-stage filtration arranged in the filter pool 41 is used for the third filtration of the collected rainwater, mainly filtering out the silt brought by the rainwater in the sidewalk catchment area 3 and the green belt catchment area 2, to ensure Ensure that mud and other impurities do not enter the storage unit 5; the cleaning nozzle 45 is connected to the cleaning water pump 622 of the recycling unit 6; the first flow meter 47 is installed at the water inlet 411 of the filter tank 41, and is electrically connected to the intelligent control unit 7; multiple cleaning nozzles 45 are arranged on the top of the filter tank 41, and are divided into three groups, each group corresponds to the water-facing surface of the coarse filter screen 42, the fine filter screen 43 and the sand filter element layer 44 for spraying and cleaning; by setting the cleaning nozzle 45 and the sludge discharge pipe 46, the intelligent control unit 7 judges and records the filtered water volume according to the water intake data collected by the first flow meter 47, and when the set filtered water volume value range is reached, the cleaning water pump 622 is controlled to supply water, and the coarse filter screen 42, the fine filter screen 43 and the sand filter element layer 44 are regularly cleaned to ensure the filtration efficiency of the filter tank 41 and efficient operation.

[0068] Among them, the sewage outlet 412 is set as follows: there are three sewage outlets 412, and their positions are: the first sewage outlet 412 is arranged between the water inlet 411 of the filter tank 41 and the coarse filter screen 42, the second sewage outlet 412 is arranged between the coarse filter screen 42 and the fine filter screen 43, and the third sewage outlet 412 is arranged between the fine filter screen 43 and the sand filter element layer 44.

[0069] Furthermore, a fourth sewage outlet 412 is provided, and the fourth sewage outlet 412 is arranged between the sand filter element layer 44 and the water outlet 413; an electromagnetic valve is provided on the sludge discharge pipe 46 and is electrically connected to the controller 72 for controlling the opening or closing of the sludge discharge pipe 46.

[0070] Regarding the specific structure of the storage unit 5, this embodiment Figure 1As shown, the storage unit 5 includes an underground water tank 51; the intelligent control unit 7 includes an above-ground machine room 73; the underground water tank 51 is connected to the water outlet 413 of the filter tank 41, and the cleaning water pump 622 of the recycling unit 6 is connected to the underground water tank 51; the underground water tank 51 is made of a concrete cast frame, and the inner wall is coated with anti-seepage material to withstand the load pressure on the ground and store rainwater for a long time without leakage; a detachable grille is arranged on the top of the underground water tank 51, and an artificial passage 52 is arranged in the above-ground machine room 73 to connect to the grille on the top of the underground water tank 51, so as to facilitate manual entry for cleaning and maintenance.

[0071] During application, the underground water reservoir 51 is cast with at least C60 concrete to form a high-strength and high-pressure-resistant wall of the underground water reservoir 51 ; a sewage outlet 412 is also provided at the bottom of the underground water reservoir 51 and connected to a sewage pipe.

[0072] Regarding the specific composition and structure of the above-mentioned recycling unit 6, this embodiment is shown in the figure, the greening irrigation mechanism 61 includes a first water pump 611 and an irrigation pipe 612, the first water pump 611 is connected to the underground water tank 51 and the irrigation pipe 612; the non-drinking water utilization mechanism 62 includes a second water pump 621 and a cleaning water pump 622, the second water pump 621 is connected to the underground water tank 51 and the public toilet pipeline, and the second water pump 621 is used to provide flushing water to the public toilet; the overflow discharge mechanism 63 includes a third water pump 631, a first discharge pipe 632 and a second discharge pipe 633, the third water pump 631 is connected to the underground water tank 51, the first discharge pipe 632 and the second discharge pipe 633, the first discharge pipe 632 is connected to the municipal sewer, the second discharge pipe 633 is connected to the river or the artificial lake, and the overflow discharge mechanism 63 is used to discharge the overflow water of the underground water tank 51 to the municipal sewer, or the river, or the artificial lake, and to inject water into the river or the artificial lake when it is dry.

[0073] Regarding the specific composition and structure of the intelligent control unit 7, this embodiment Figure 1 As shown, the intelligent control unit 7 includes a water level meter 71 and a controller 72; the controller 72, the cleaning water pump 622, the first water pump 611, the second water pump 621 and the third water pump 631 are all installed in the above-ground machine room 73; the water level meter 71 is arranged in the underground water reservoir 51 and is electrically connected to the controller 72, for measuring the water level of the underground water reservoir 51 and recording the water level data; the controller 72 is electrically connected to the first flow meter 47; the controller 72 is connected to the network to receive and record weather data, and at the same time monitors the rainwater infiltration and storage volume in real time through the first flow meter 47 and the water level meter 71, automatically controls the operation of the cleaning water pump 622, the first water pump 611, the second water pump 621 and the third water pump 631, controls and distributes water consumption, and analyzes the water intake data collected by the first flow meter 47 and the water level data collected by the water level meter 71 in combination with weather data to optimize water distribution.

[0074] When in use, the controller 72 is connected to the Internet and determines whether the river and green belt need to be watered based on weather data, thereby automatically controlling the operation of the greening irrigation mechanism 61 and the overflow discharge mechanism 63; based on the water level data of the underground water reservoir 51, as long as the water level of the underground water reservoir 51 is not lower than half of the water storage capacity, the controller 72 controls the second water pump 621 of the non-drinking water utilization mechanism 62 to continuously supply water to the public toilet through the toilet water supply pipe 623. When the water level of the underground water reservoir 51 is lower than half of the water storage capacity, the controller 72 turns off the second water pump 621, and the public toilet automatically switches to tap water supply through the electronic valve control pipeline; when the water level of the underground water reservoir 51 reaches its peak, the controller 72 controls the overflow discharge mechanism 63 to automatically drain water into the river artificial lake.

[0075] In addition, the first discharge pipe 632, the second discharge pipe 633, the toilet water supply pipe 623 and the water pipe connected to the cleaning nozzle 45 in the system are all installed with solenoid valves and are electrically connected to the controller 72 to control the switching of the open or closed state of the pipeline.

[0076] Based on the above embodiments of the greening rainwater collection system and construction method for sponge city, a construction method for the greening rainwater collection system for sponge city is provided, comprising the following steps:

[0077] S1. Site preparation;

[0078] S1.1. Level and compact the construction site to ensure the stability of the foundation;

[0079] S1.2. Plan the location and area of ​​the planting layer and permeable layer, and determine the location of the underground water reservoir and the location of the above-ground machine room;

[0080] S2, installation of each unit;

[0081] S2.1. First, dig the pit of the water storage tank, pour the underground water storage tank and carry out anti-seepage treatment, install the water level meter, and reserve the pipeline;

[0082] S2.2, pour the filter tank, install the coarse filter screen, fine filter screen, sand filter core layer, cleaning nozzle, sludge discharge pipe and the first flow meter, and reserve pipelines;

[0083] S2.3. Lay the permeable layer and the planting layer in sequence, ensuring that the layers are closely connected to form a green belt water collection area; pour or build a confluence culvert, and lay permeable bricks to form a sidewalk water collection area; the permeable layer and the confluence culvert meet at the confluence port, and the filter tank is connected to the confluence port;

[0084] S2.4, connecting pipes and circuits of each unit;

[0085] S3. Debugging and acceptance

[0086] S3.1. After installation, perform system debugging to ensure the normal operation of each unit;

[0087] S3.2. Conduct rainwater collection and filtration purification tests to check the actual effect and performance of the system;

[0088] S3.3. After passing the acceptance, it will be officially put into use and regularly maintained.

[0089] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

[0090] The above is a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered as the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A greening rainwater collection system for sponge cities, characterized in that: It includes greening rainwater collection units, filtration units and storage units laid out in layers from the surface to the underground; as well as reuse units and intelligent control units; The greening rainwater collection unit is used to increase the rainwater collection of green belts and sidewalks in the city and the water storage capacity of green belts during the rainy season; The combination of the filtering unit and the storage unit is used to guide water to flow to a deeper layer, reducing surface runoff in green belts and sidewalks. At the same time, the green rainwater collection unit uses plant roots to fix soil and debris and purify water, thereby improving the utilization rate of rainwater and reducing runoff pollution. The reuse unit includes a greening irrigation mechanism, a non-drinking water utilization mechanism and an overflow discharge mechanism, which uses rainwater for greening irrigation, or non-drinking use, or discharges; The combination of the intelligent control unit is used to comprehensively judge the rainy season or the dry season according to the weather forecast and the weather data of previous years, and reasonably distribute the water stored in the storage unit to the reuse unit to ensure that the annual water level of the storage unit is not lower than the minimum water level; The greening rainwater collection unit includes a green belt water collection area and a sidewalk water collection area; The green belt water collection area is provided with a planting layer and a permeable layer in sequence; wherein the planting layer uses the vegetation on the surface of the green land to increase the absorption capacity and collection amount of rainwater, and the multi-layer soil provided in the planting layer is used to increase the infiltration amount of rainwater and form primary infiltration and primary filtration; The permeable layer is laid below the planting layer and is erected above the filtering unit. The permeable layer is made of permeable concrete or a concrete frame with permeable bricks. It is used to collect the infiltrating rainwater and filter it twice through the permeable concrete or permeable bricks before entering the filtering unit to enhance the rainwater infiltration, convergence and filtering effect. The sidewalk water collection area is provided with permeable bricks and confluence culverts in sequence from the surface to the underground; wherein the confluence culvert is constructed in a Z-shaped path, and the confluence culvert is provided with a drainage slope inclined from the surface to the underground, so as to utilize the culvert of the Z-shaped path so that rainwater falling into the culvert enters the corner of the culvert to form a local vortex when flowing, and takes away the sediment flowing into the culvert, thereby preventing sediment accumulation from weakening the cross-sectional flow of the confluence culvert; A single permeable brick is laid across two parallel culverts to disperse the rainfall entering the culvert through the single permeable brick, so that the rainfall on the culvert path is balanced and flows continuously, and the silt flowing into the culvert is continuously taken away to avoid silt accumulation; The filtering unit comprises a filtering tank, a coarse filter screen, a fine filter screen, a sand filter core layer, a cleaning nozzle, a sludge discharge pipe and a first flow meter; In the vertical height of the filter pool, the water inlet of the filter pool is arranged in the middle, the sewage outlet is arranged at the bottom, and the water outlet is arranged between the water inlet and the pool top; the water inlet is connected to the confluence of the confluence culvert and the permeable layer; the sewage outlet is connected to the sludge discharge pipe; The coarse filter, the fine filter and the sand filter core layer are arranged in sequence from the water inlet direction to the water outlet direction. The multi-stage filter arranged in the filter pool is used to filter the collected rainwater for the third time, mainly filtering out the silt brought by the rainwater in the sidewalk catchment area and the green belt catchment area, ensuring that the silt and other impurities do not enter the storage unit; The cleaning nozzle is connected to the cleaning water pump of the recycling unit; the first flow meter is installed at the water inlet of the filter pool and is electrically connected to the intelligent control unit; a plurality of the cleaning nozzles are arranged on the top of the filter pool and are divided into three groups, each group corresponding to spray cleaning the coarse filter screen, the fine filter screen and the water-facing surface of the sand filter core layer; By setting the cleaning nozzle and the sludge discharge pipe, the intelligent control unit determines and records the filtered water volume according to the water intake data collected by the first flow meter, and when the set filtered water volume value interval is reached, the cleaning water pump is controlled to supply water, and the coarse filter screen, the fine filter screen and the sand filter core layer are regularly cleaned to ensure the filtering efficiency of the filter pool and efficient operation; There are three sewage outlets, and their positions are as follows: the first sewage outlet is arranged between the water inlet of the filter tank and the coarse filter screen, the second sewage outlet is arranged between the coarse filter screen and the fine filter screen, and the third sewage outlet is arranged between the fine filter screen and the sand filter core layer.

2. The greening rainwater collection system for sponge cities according to claim 1 is characterized in that: The planting layer includes, from top to bottom, a vegetation layer of lawn and shrub mixture, an organic soil layer, a middle soil layer, a gravel layer and a water-filtration carbon layer, wherein the water-filtration carbon layer is directly laid on the permeable layer; A nylon mesh is sandwiched between the water-filtering carbon layers to enhance the fixation of the water-filtering carbon.

3. The greening rainwater collection system for sponge cities according to claim 2 is characterized in that: The organic soil layer is formed by mixing plant fallen leaves, plant stems, kitchen waste, pumice and rice-grained stone.

4. The greening rainwater collection system for sponge cities according to claim 1 is characterized in that: The storage unit includes an underground water tank; the intelligent control unit includes an above-ground machine room; The underground water reservoir is connected to the water outlet of the filter tank, and the cleaning water pump of the recycling unit is connected to the underground water reservoir; The underground water storage tank is made of a concrete frame, and the inner wall is coated with anti-seepage material to withstand the load pressure on the ground and store rainwater for a long time without leakage; A detachable grille is arranged on the top of the underground water reservoir, and an artificial passage is arranged in the above-ground machine room to connect to the grille on the top of the underground water reservoir, so as to facilitate manual entry for cleaning and maintenance.

5. The greening rainwater collection system for sponge cities according to claim 4 is characterized in that: The greening irrigation mechanism comprises a first water pump and an irrigation pipeline, wherein the first water pump is connected to the underground water reservoir and the irrigation pipeline; The non-drinking water utilization mechanism includes a second water pump and the cleaning water pump, the second water pump is connected to the underground water tank and the pipeline of the public toilet, and the second water pump is used to provide flushing water to the public toilet; The overflow discharge mechanism includes a third water pump, a first discharge pipe and a second discharge pipe. The third water pump is connected to the underground water reservoir, the first discharge pipe and the second discharge pipe. The first discharge pipe is connected to the municipal sewer, and the second discharge pipe is connected to a river or an artificial lake. The overflow discharge mechanism is used to discharge overflow water from the underground water reservoir to the municipal sewer, the river, or the artificial lake, and to inject water into the river or the artificial lake when it is dry.

6. The greening rainwater collection system for sponge cities according to claim 5 is characterized in that: The intelligent control unit includes a water level meter and a controller; the controller, the cleaning water pump, the first water pump, the second water pump and the third water pump are all installed in the above-ground machine room; The water level meter is arranged in the underground water reservoir and is electrically connected to the controller, and is used to measure the water level of the underground water reservoir and record water level data; The controller is electrically connected to the first flow meter; The controller is connected to the Internet to receive and record weather data, and at the same time monitors rainwater infiltration and storage in real time through the first flow meter and the water level meter, automatically controls the operation of the cleaning water pump, the first water pump, the second water pump and the third water pump, controls and distributes water consumption, and analyzes the water intake data collected by the first flow meter and the water level data collected by the water level meter in combination with weather data to optimize water distribution.

7. A construction method of the greening rainwater collection system for sponge cities according to claim 6, characterized in that: The following steps are included: S1. Site preparation; S1.

1. Level and compact the construction site to ensure the stability of the foundation; S1.

2. Plan the location and area of ​​the planting layer and permeable layer, and determine the location of the underground water reservoir and the location of the above-ground machine room; S2, installation of each unit; S2.

1. First, dig the pit of the water storage tank, pour the underground water storage tank and carry out anti-seepage treatment, install the water level meter, and reserve the pipeline; S2.2, pour the filter tank, install the coarse filter screen, fine filter screen, sand filter core layer, cleaning nozzle, sludge discharge pipe and the first flow meter, and reserve pipelines; S2.

3. Lay the permeable layer and the planting layer in sequence, ensuring that the layers are closely connected to form a green belt water collection area; pour or build a confluence culvert, and lay permeable bricks to form a sidewalk water collection area; the permeable layer and the confluence culvert meet at the confluence port, and the filter tank is connected to the confluence port; S2.4, connecting pipes and circuits of each unit; S3. Debugging and acceptance S3.

1. After installation, perform system debugging to ensure the normal operation of each unit; S3.

2. Conduct rainwater collection and filtration purification tests to check the actual effect and performance of the system; S3.

3. After passing the acceptance, it will be officially put into use and regularly maintained.

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