CN106759825B - Construction method of sponge urban green land water storage system - Google Patents

Abstract

The invention discloses a construction method of a sponge urban green land water storage system, which comprises the following steps: (a) building a foundation pit; (b) burying a reservoir; (c) storing water on the ground in place; (d) burying a seepage well; (e) paving bricks; (f) and (5) greening. The invention has the advantages of simple construction, low difficulty, orderly construction, easy control of construction quality, less related construction equipment, low construction cost, good permeation effect, relief of urban drainage pressure, increase of underground water resource amount, reduction of urban rainfall and flood and improvement of urban environment.

Description

Construction method of sponge urban green land water storage system

Technical Field

The invention belongs to the field of sponge urban water resource utilization, and particularly relates to a construction method of a sponge urban green land water storage system.

Background

Along with the propulsion of urbanization construction, the increase of ground hardening has changed original hydrological characteristics, causes the rainwater runoff to increase, and frequent ponding in road surface, the frequent large tracts of land ponding in part city, the peak value grow of rain flood simultaneously, soil water content reduces, and ground water level decline phenomenon aggravation etc.. In addition, the urban water shortage problem in China is increasingly serious, the water is deficient in a resource type in the northern area, and the water is deficient in a water quality type in the southern area. Under the circumstance, the government proposes the target of building the sponge city and supports the policy, the finance and the like.

The sponge city, as the name suggests, just like a sponge, can rapidly absorb, accumulate, permeate and purify rainwater in a rainfall period, reduce the runoff formed by the rainwater and supplement underground water; meanwhile, when the rain is not raining, accumulated water is utilized through a series of treatment measures and matched pipe network facilities, so that rain water resources are better integrated into a water supply and drainage system of a city. The reasonable sponge urban water system is created, the original ecological system of the city can be effectively protected, the original damaged ecological system can be slowly recovered, and meanwhile, the influence on the whole urbanization construction and development is reduced.

The traditional sponge city construction mode is that hardened pavement is everywhere. In heavy rain, water is drained mainly by means of 'grey' facilities such as pipe ducts and pump stations, the 'quick draining' and 'tail end centralized' control are used as main planning and designing concepts, rainwater is drained mainly through the drainage facilities and cannot permeate into the ground, and therefore water logging and drought and water logging rush turning are caused when rain occurs, and the requirements of sponge city construction are not met.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art, and provides a construction method of a sponge urban green land water storage system, which has the advantages of simple construction, low difficulty, ordered construction, easy control of construction quality, less related construction equipment, low construction cost, good permeation effect, relief of urban drainage pressure, increase of underground water resource amount, reduction of urban rainfall flood and improvement of urban environment.

In order to solve the technical problems, the invention adopts the following technical scheme:

a construction method of a sponge urban green land water storage system is characterized by comprising the following steps:

(a) building a foundation pit: according to a design construction drawing, excavating a foundation pit to a design depth, making foundation pit wall protection, cleaning and leveling the pit bottom, compacting a base layer, laying a waterproof geomembrane on the base layer, backfilling an original soil protection layer with the thickness of 5-8 cm on the waterproof geomembrane, tamping and leveling to ensure the flatness and verticality of the foundation pit, improving the anti-seepage effect, and preventing the foundation pit from collapse and landslide so as to ensure the construction quality;

(b) burying a reservoir: building a reservoir and embedding drain pipes on an original soil protective layer, wrapping the reservoir with a waterproof geomembrane after the reservoir is built, wherein the distance between every two drain pipes is 4-5 m, the water outlet ends of the drain pipes are connected to a multi-way pipe in a one-to-one mode, the water outlet ends of the multi-way pipe are connected into the reservoir, the reservoir is buried by backfilling the original soil, the backfilling height is 550-600 mm, manual tamping is carried out every 150-200 mm, the reservoir is wrapped with the waterproof geomembrane, rainwater stored in the reservoir can be prevented from seeping outwards, the surrounding original soil can be prevented from invading the reservoir, the extrusion effect on the reservoir is reduced, the protective effect is achieved, the compaction degree of compaction of the filled soil can be improved by layered tamping, the soil covering strength is improved, and;

(c) water storage on the ground in place: the water storage tank and the water suction pump are respectively fixed on the ground within the range of 3m around the foundation pit, the water outlet end of the water suction pump is connected with the water storage tank through a PB pipe, the PB pipe is protected, supported and fixed, the water inlet end of the water suction pump is connected with the water outlet end of the water storage tank through a PVC pipe, rainwater collected in the water storage tank is pumped into the water storage tank through the water suction pump to be stored, and the stored rainwater can replace part of city tap water and underground water and is applied to greening irrigation, road cleaning, water landscape supplementation, toilet flushing and the like and can also be used as a water source for landscape water in parks, so that the resource utilization efficiency of the rainwater is greatly improved, waste is changed into valuable, the problem of water resource shortage is relieved, water and soil loss is reduced, and the method has great significance for building;

(d) burying a seepage well: laying a seepage well according to the position of the drainage pipe, backfilling a gap between adjacent seepage wells with original soil, tamping and leveling, laying a water collecting pipe, communicating one end of the water collecting pipe with a well cover of the seepage well, wherein the seepage well can also be used for collecting rainwater, when the upper limit of collection of the seepage well is exceeded, the redundant rainwater is conveyed downwards through the drainage pipe, and finally the collected redundant rainwater is all stored in the reservoir;

(e) paving bricks: wrapping the permeation tube with a permeable geotextile in advance, abutting the wrapped permeation tube with the tube opening of the water collecting tube, fixing to enable the tube opening of the permeation tube to be flush with the ground, marking a water seepage ditch area by using an ash line according to the layout of the permeation tube, wherein the width of the water seepage ditch is larger than the diameter of the permeation tube by 50-80 mm, laying a reverse filter layer between adjacent water seepage ditch areas, wherein the reverse filter layer sequentially comprises a gravel layer with the thickness of 100-150 mm, a gravel layer with the thickness of 100-150 cm and a sand layer with the thickness of 200-250 mm from bottom to top, dividing a brick paving area and a green land area, wherein the green land area is distributed at two sides of the brick paving area, the brick paving area adopts permeable bricks and permeable concrete for paving, after laying, tamping, watering and maintaining, the permeable bricks and the permeable concrete have good air permeability and water permeability, can enable rainwater to rapidly permeate downwards, thereby relieving the pressure of urban drainage and flood resistance, and the rainwater enters the reverse filter layer, rainwater migrates in the inverted filter layer, the rainwater can only permeate downwards through pores, the flow rate is low, the retention time is long, the gravel layer and the sandy soil layer have adsorption capacity, organic particles in the rainwater are adsorbed and degraded by anaerobic microorganisms growing in the pores, the purified rainwater is stored in shallow soil, the water content of the shallow soil can be increased, the climate can be adjusted, the urban heat island effect can be restrained, meanwhile, the peak flow of runoff and the threat of flood disasters can be reduced, the super-seepage part enters a green land area, and surface runoff is reduced to the maximum extent;

(f) greening: chiseling sand on the surface of the green land area to form slopes with two sides facing the infiltration ditch area, controlling the slope to be 2% -3%, paving turf and planting shrubs in the green land area, paving a centimeter layer with the thickness of 80-100 mm in the infiltration ditch area, compacting and leveling, cutting off the part of the permeation tube exceeding the centimeter layer to be level with the top surface of the centimeter layer, covering the mouth of the permeation tube with a tree pool cover plate, arranging the slopes to drain rainwater exceeding the permeation capability of the permeable bricks to the infiltration ditch, accelerating the drainage efficiency, enabling the rainwater to enter the permeation tube along the pores of the tree pool cover plate, and then conveying the rainwater downwards through the permeation tube, wherein plants in the green land have the function of intercepting the rainwater in the flow process of the green land area to increase the detention time of the rainwater in the green land area, and plant roots can play a role of purifying the suspended matters, impurities and the like in rainwater runoff, rainwater infiltrates in situ, directly infiltrates into the inverted filter layer, is absorbed and filtered by the inverted filter layer, and the purified rainwater is stored in shallow soil, so that the water resource storage amount of the soil is increased, the irrigation water consumption of greenbelt is reduced, the soil is fully utilized to intercept and filter the rainwater, the quality of the infiltration rainwater is improved, and the groundwater environment is improved.

Further, in the step (f), the chiseled sandy soil is piled up into soil piles, the soil piles are transversely arranged at intervals of 2-3 m, the time and distance of rainwater flowing in the green land area are prolonged by utilizing the fluctuation of the micro-topography, the rainwater is maximally infiltrated, and the water and soil loss caused by heavy rainfall is prevented.

And (f) excavating a drainage ditch with the width of 30-50 mm at intervals of 3-5 m in the green land area, wherein the direction of the drainage ditch is consistent with the slope-releasing direction, and the drainage ditch plays a role in guiding flow, so that rainwater is quickly drained towards the infiltration ditch, the infiltration pressure of the green land area is reduced, the rainwater is directly drained into the infiltration ditch, and redundant rainwater is downwards conveyed by the infiltration pipe.

Further, when the waterproof geomembrane is laid in the step (a), the center of the foundation pit is used as a laying starting point, the waterproof geomembrane is laid towards two sides, the waterproof geomembrane is leveled after being leveled, and cement nails are used for fixing every 2-3 m, so that the waterproof geomembrane is prevented from being wrinkled and protruded, the waste during laying is avoided, and the material cost is saved.

Further, before laying the infiltration well in step (d), fixing the well basin, filling the water filtering well plate into the well basin in a mode of aligning the fixing bulges to the mounting grooves, then injecting cement slurry into the mounting grooves, simultaneously cleaning slurry overflowing the mounting grooves, and then placing the well lid on the well basin, wherein the infiltration well is stable in structure, reliable in strength, convenient to construct and high in mounting efficiency.

Furthermore, in the step (d), the water seepage well comprises a well pool, a water filtering well plate and a well lid, the well lid is arranged on the well pool, the water filtering well plate is arranged in the well pool, water permeable holes are uniformly distributed on the water filtering well plate, fixing bulges are symmetrically distributed on the water filtering well plate, mounting grooves are symmetrically distributed in the well pool and matched with the fixing bulges, a water outlet is arranged on the side surface of the well pool, a water inlet is arranged on the well lid, the water filtering well plate is arranged in the well pool only by aligning the fixing bulges to the mounting grooves during construction, then cement slurry is injected into the mounting grooves, so that the water filtering well plate is bonded and fixed on the inner wall of the well pool, the operation is simple, the operation; the water filtering well plate plays a role in blocking rainwater, the rainwater can only continuously permeate downwards through the water permeable holes, and the residual fixed particles in the rainwater are blocked on the surface of the water filtering well plate and cannot fall down, so that impurities are separated; the seepage well is used as a container for collecting rainwater, so that the rainwater is stored underground and does not occupy the ground space.

Further, the watering and maintaining method in the step (e) is to cover the whole brick paving area with the rice straw piles, water and maintain, the maintaining time is 1-2 days, the rice straw piles are guaranteed to be wet during the maintaining period, idle persons are prohibited to step on the rice straw piles, the strength of the permeable bricks and the permeable concrete can be guaranteed through the watering and maintaining, cracks are prevented from being generated, and the water permeability of the permeable bricks is kept.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the invention has simple construction, low difficulty, orderly construction, easy control of construction quality, less related construction equipment, low construction cost and good permeation effect, adopts permeable bricks and permeable concrete for paving, ensures that rainwater rapidly infiltrates, the super-infiltrated part enters a green area, plants in the green area can intercept the rainwater, the detention time of the rainwater in the green area is increased, plant root systems can purify suspended matters, impurities and the like in rainwater runoff, the rainwater infiltrates in situ and directly infiltrates into a reverse filter layer, the rainwater migrates in the reverse filter layer after entering the reverse filter layer, the rainwater can only infiltrate downwards through pores, the flow rate is slow, the detention time is long, a gravel layer and a sandy soil layer have adsorption capacity, organic particles in the rainwater are adsorbed and degraded by anaerobic microorganisms growing in the pores, the purified rainwater is stored in shallow soil, the water content of multiplicable shallow soil, adjust the weather, restrain urban heat island effect, the pollution and the flood disaster threat of while also reducible runoff, the rainwater that reachs the infiltration ditch then gets into the infiltration pipe along the hole of tree pool apron, carry the rainwater downwards by the infiltration pipe again, send into the infiltration well through the collector pipe in, the infiltration well is as the container of collecting the rainwater, store the rainwater in the underground, do not occupy the ground space, the drainage well board plays the effect of retarding the rainwater, the rainwater can only continue the infiltration downwards through the hole of permeating water, remaining fixed particle is stopped on the drainage well board surface in the rainwater, can't fall, impurity has been separated. When the rainwater quantity exceeds the upper limit of the collection of the seepage well, the redundant rainwater is conveyed downwards through the drain pipe, the finally collected redundant rainwater is totally stored in the reservoir, the rainwater collected in the reservoir is pumped into the water storage tank through the water suction pump to be stored, the stored rainwater can replace part of city tap water and underground water, the rainwater-based rainwater combined irrigation system is applied to greening irrigation, road cleaning, water landscape supplementation, toilet flushing and the like, and can also be used as a water source for park landscape water, the rainwater resource utilization efficiency is greatly improved, waste is changed into valuable, discontinuous and unstable rainwater resources are converted into a stable system with continuous water supply capacity, the stable system becomes water resources for comprehensive utilization of urban greenbelts, the problem of water resource shortage is relieved, and the rainwater combined irrigation system has great significance for building ecological agriculture, ecological cities and protecting environment.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural view of a sponge urban green land water storage system according to the present invention;

FIG. 2 is a schematic structural view of a water seepage well according to the present invention;

FIG. 3 is a schematic view of the structure of the water filtering well plate of the present invention;

FIG. 4 is a schematic flow chart of a construction method of the sponge urban green land water storage system.

In the figure: 1, foundation pit; 2, a water reservoir; 3, a drain pipe; 4-multi-way pipe; 5-a water storage tank; 6-water pump; 7-a water seepage well; 8-well pool; 9-water filtering well plate; 10-a well cover; 11-water permeable holes; 12-a fixing protrusion; 13-mounting grooves; 14-a water outlet; 15-a water inlet; 16-a water collecting pipe; 17-a permeate tube; 18-a water seepage ditch area; 19-a crushed stone layer; 20-a gravel layer; 21-a sand layer; 22-brick-laying area; 23-green land area; 24-tree pool cover plate.

Detailed Description

As shown in fig. 1 to 4, the construction method of the sponge urban green land water storage system of the invention comprises the following steps:

(a) building a foundation pit: according to a design construction drawing, excavating the foundation pit 1 to a design depth, and protecting the pit wall of the foundation pit 1 to prevent the foundation pit 1 from collapse and landslide, so that the construction quality is ensured. Clear up the bottom of a pit, the flattening is and suppress the basic unit, lays waterproof geomembrane on the basic unit to backfill the former soil protective layer of 5 ~ 8cm thick on waterproof geomembrane, tamp and level, former soil protective layer can prevent to receive destruction in the waterproof geomembrane later stage construction, plays the guard action. The flatness and the verticality of the foundation pit 1 are ensured, and the anti-seepage effect can be improved. When laying the waterproof geomembrane, use foundation ditch 1 center as laying the starting point, lay to both sides, flatten the back and press neatly, fix with the cement nail every 2 ~ 3m, prevent that waterproof geomembrane fold is protruding, extravagant when avoiding laying, save material cost.

(b) Burying a reservoir: build cistern 2 and bury drain pipe 3 underground on former soil protective layer, including cistern 2 builds the water-proof geomembrane with its parcel after finishing by laying bricks or stones, wrap up cistern 2 with water-proof geomembrane, can prevent that the rainwater of storage in the cistern 2 from outwards oozing, can also prevent around former soil invasion cistern 2, reduce the squeezing action that cistern 2 received, play the guard action. The distance between each row of drain pipes 3 is 4-5 m, the water outlet ends of each row of drain pipes 3 are all in butt joint with the multi-way pipe 4, the water outlet ends of the multi-way pipes 4 are connected into the reservoir 2, the reservoir 2 is buried by backfilling original soil, the backfilling height is 550-600 mm, manual tamping is carried out every time 150-200 mm is filled, the compaction degree of the filled soil can be improved by layered tamping, the soil covering strength is improved, and collapse of the foundation pit 1 is prevented.

(c) Water storage on the ground in place: fix water storage tank 5 and suction pump 6 subaerial at 1 peripheral 3m within range of foundation ditch respectively, the water outlet end of suction pump 6 is with PB union coupling water storage tank 5 to protect the support to the PB pipe and fix, prevent that suction pump 6 from taking place to rock and twining at drainage in-process PB pipe, influence drainage efficiency. The water inlet end of the water suction pump 6 is connected with the water outlet end of the water storage tank 2 through a PVC pipe, rainwater collected in the water storage tank 2 is pumped into the water storage tank 5 through the water suction pump 6 to be stored, and the stored rainwater can replace part of city tap water and underground water, is applied to greening irrigation, road cleaning, water landscape supplementation, toilet flushing and the like, and can also be used as a water source for park landscape water, so that the resource utilization efficiency of the rainwater is greatly improved, waste is changed into valuable, the problem of water resource shortage is relieved, water and soil loss is reduced, and the water and soil combined type rainwater water storage tank has great significance for building ecological agriculture, ecological cities and environment protection.

(d) Burying a seepage well: percolating well 7 includes well pond 8, water filtering well board 9 and well lid 10, well lid 10 is located on well pond 8, water filtering well board 9 is located in well pond 8, evenly distributed has hole 11 of permeating water on water filtering well board 9, the last symmetric distribution of water filtering well board 9 has fixed arch 12, the symmetric distribution has mounting groove 13 in the well pond 8, mounting groove 13 and fixed arch 12 phase-match, the side of well pond 8 is equipped with outlet 14, be equipped with water inlet 15 on the well lid 10, only need during the construction according to fixed arch 12 aim at the mode of mounting groove 13 with well pond 8 of packing into with well board 9, then pour into cement slurry into in the mounting groove 13, make water filtering well board 9 bond and fix on well pond 8's inner wall, and is simple in operation, and is quick effective, and high in construction efficiency. The water filtering well plate 9 plays a role in blocking rainwater, the rainwater can only continuously permeate downwards through the water permeable holes 11, and the residual fixed particles in the rainwater are blocked on the surface of the water filtering well plate 9 and cannot fall down, so that impurities are separated. The seepage well 7 is used as a container for collecting rainwater, and the rainwater is stored underground without occupying ground space.

Before laying the infiltration well 7, fix well pond 8 earlier, aim at the mode of mounting groove 13 with water filtering well board 9 according to fixed protruding 12 and pack into well pond 8, then pour into cement paste into mounting groove 13, clear up the thick liquid that overflows mounting groove 13 simultaneously, shelve well lid 10 on well pond 8 again, infiltration well 7 does stable in structure, and intensity is reliable, and construction convenience, the installation effectiveness is high. Laying a water seepage well 7 according to the position of the drain pipe 3, connecting the drain pipe 3 into a water outlet 14 of a well pool 8, backfilling a gap between adjacent water seepage wells 7 with original soil, tamping the soil to be flat, then laying a water collecting pipe 16, connecting the water collecting pipe 16 into a water inlet 15 of the well lid 10, wherein the water seepage well 7 can also be used for collecting rainwater, when the upper limit of collection of the water seepage well 7 is exceeded, the redundant rainwater is conveyed downwards through the drain pipe 3, and finally the collected redundant rainwater is all stored in the reservoir 2 uniformly.

(e) Paving bricks: wrapping a permeation tube 17 with permeable geotextile in advance, abutting the wrapped permeation tube 17 with a tube opening of a water collecting tube 16, fixing to enable the tube opening of the permeation tube 17 to be flush with the ground, marking a water seepage ditch area 18 by using an ash line according to the layout of the permeation tube 17, wherein the width of the water seepage ditch is larger than the diameter of the permeation tube 17 by 50-80 mm, laying a reverse filter layer between adjacent water seepage ditch areas 18, wherein the reverse filter layer sequentially comprises a gravel layer 19 with the thickness of 100-150 mm, a gravel layer 20 with the thickness of 100-150 cm and a sand layer 21 with the thickness of 200-250 mm from bottom to top, dividing a brick paving area 22 and a green land area 23, the green land area 23 is distributed at two sides of the brick paving area 22, the brick paving area 22 is paved by adopting permeable bricks and permeable concrete, tamping, leveling and watering, and curing, wherein the watering curing method comprises the steps of covering the whole brick paving area 22 by using a straw pile, watering and curing for 1-2 days, during the maintenance, the rice straw is guaranteed to be wet, and the idle person is prohibited to trample on the rice straw, the strength of the permeable brick and the permeable concrete can be guaranteed through watering maintenance, cracks are prevented from being generated, and the water permeability of the permeable brick is kept. The permeable bricks and the permeable concrete have good air permeability and water permeability, rainwater can rapidly infiltrate, so that the pressure of urban drainage and flood fighting is relieved, the rainwater migrates in the inverted filter after entering the inverted filter, the rainwater can only infiltrate downwards through pores, the flow rate is low, the retention time is long, the gravel layer 19, the gravel layer 20 and the sand layer 21 have adsorption capacity, organic particles in the rainwater are adsorbed and degraded by anaerobic microorganisms growing in the pores, the purified rainwater is stored in shallow soil, the water content of the shallow soil can be increased, the climate can be adjusted, the urban heat island effect can be restrained, the peak flow and flood disaster threats of runoff can be reduced, the super-seepage part enters the green land area 23, and the surface runoff is reduced to the maximum extent.

(f) Greening: chiseling off sand and soil on the surface of the green land area 23 to form slopes with two sides sloping towards the water seepage ditch area 18, controlling the slope to be 2% -3%, piling the chiseled sand and soil into soil piles, transversely arranging one soil pile at intervals of 2-3 m, and prolonging the flowing time and distance of rainwater in the green land area 23 by using the fluctuation of the micro-topography to ensure that the rainwater is maximally seeped back and prevent water and soil loss when rainfall is large. Then, turf is paved in a green land area 23, shrubs are planted, a centimeter stone layer with the thickness of 80-100 mm is paved in a water seepage ditch area 18, the turf is compacted and leveled, the part of the permeation tube 17, which exceeds the centimeter stone layer, is cut to enable the part to be leveled with the top surface of the centimeter stone layer, then the mouth of the permeation tube 17 is covered by a tree pool cover plate 24, the sloping land shape enables rainwater which exceeds the permeation capability of the permeable brick to be drained to the water seepage ditch, the drainage efficiency is accelerated, the rainwater flows in along the pores of the tree pool cover plate 24, the rainwater is filtered and separated once by the hollowed-out design of the tree pool cover plate 24, then the rainwater is filtered for the second time by the permeable geotextile wrapping the permeation tube 17, the rainwater filtered at two sides enters the permeation tube 17, and the rainwater is conveyed downwards by the permeation tube 17.

In the flowing process of the rainwater in the green land area 23, plants in the green land play a role in intercepting the rainwater, the detention time of the rainwater in the green land area 23 is prolonged, plant root systems can play a role in purifying suspended matters, impurities and the like in rainwater runoff, the rainwater infiltrates on the spot and directly infiltrates into the reverse filter layer, the reverse filter layer adsorbs and filters, the purified rainwater is stored in shallow soil, the water resource storage amount of the soil is increased, the irrigation water consumption of the green land is also reduced, on the other hand, the soil is fully utilized to intercept and filter the rainwater, the quality of the rainwater which infiltrates is improved, and the groundwater environment is improved. A drainage ditch with the width of 30-50 mm is dug in the green land area 23 every 3-5 m, the direction of the drainage ditch is consistent with the slope-releasing direction, the drainage ditch plays a role in guiding water, rainwater is quickly drained towards the water seepage ditch, infiltration pressure of the green land area 23 is reduced, the rainwater is directly drained into the water seepage ditch, and redundant rainwater is downwards conveyed by the infiltration pipe 17.

The invention has simple construction, low difficulty, orderly construction, easy control of construction quality, less related construction equipment, low construction cost and good permeation effect, adopts permeable bricks and permeable concrete for paving, ensures that rainwater rapidly infiltrates, the super-infiltrated part enters the greenbelt area 23, plants in the greenbelt have the function of intercepting the rainwater, increases the detention time of the rainwater in the greenbelt area 23, ensures that the root system of the plant can purify suspended matters, impurities and the like in rainwater runoff, ensures that the rainwater infiltrates in situ and directly infiltrates into the reverse filter layer, ensures that the rainwater migrates in the reverse filter layer, can only infiltrate downwards through pores, has slow flow rate and long retention time, has the adsorption capacity on organic particles in the rainwater, adsorbs organic particles in the rainwater, is degraded by anaerobic microorganisms growing in the pores, and stores the purified rainwater in shallow soil, the water content of multiplicable shallow soil, adjust the weather, restrain urban heat island effect, simultaneously also can reduce the pollution and the flood disaster threat of runoff, the rainwater that reaches the infiltration ditch then gets into infiltration pipe 17 along the hole of tree pool apron 24, carry the rainwater downwards by infiltration pipe 17 again, send into infiltration well 7 through collector pipe 16, infiltration well 7 is as the container of collecting the rainwater, store the rainwater underground, do not occupy the ground space, drainage well board 9 plays the effect of retardation rainwater, the rainwater can only continue the infiltration downwards through permeable hole 11, remaining fixed particle is blocked on drainage well board 9 surface in the rainwater, unable whereabouts, impurity has been separated. When the rainwater amount exceeds the upper collection limit of the water seepage well 7, the redundant rainwater is conveyed downwards through the drain pipe 3, the finally collected redundant rainwater enters the water storage tank 2 to be stored uniformly, the rainwater collected in the reservoir 2 is pumped into the water storage tank 5 through the water suction pump 6 to be stored, the stored rainwater can replace part of city tap water and underground water, the water storage tank is applied to greening irrigation, road cleaning, water landscape supplementation, toilet flushing and the like, and can also be used as a water source for park landscape water, the resource utilization efficiency of the rainwater is greatly improved, waste is changed into valuable, discontinuous and unstable rainwater resources in space and time are converted into a stable system with continuous water supply capacity, the stable system becomes water resources capable of being comprehensively utilized in urban greenbelts, the problem of water resource shortage is relieved, and the water storage tank has great significance for building ecological agriculture, ecological cities and environment protection.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.

Claims (4)

1. a construction method of a sponge city green space water storage system, is characterized in that comprising the steps: (a) Establishment of foundation pit: According to the design and construction drawings, excavate the foundation pit to the design depth, do a good job in protecting the walls of the foundation pit, clean and level the pit bottom and suppress the base layer, and lay a waterproof geomembrane on the base layer. And backfill the original soil protective layer with a thickness of 5-8cm on the waterproof geomembrane, compact it and level it; (b) Reservoir burying: build a reservoir and bury drainage pipes on the original soil protection layer. After the reservoir is built, it is wrapped with a waterproof geomembrane. The distance between each row of drainage pipes is 4-5m. The water outlet ends of each row of drainage pipes shall be connected to the multi-pass pipe uniformly, and the water outlet end of the multi-pass pipe shall be connected to the reservoir, and the reservoir shall be buried with the original soil backfill. The backfill height is 550-600mm. compact; (c) Ground water storage in place: Fix the water storage tank and the pumping pump on the ground within 3m around the foundation pit, respectively. , the inlet end of the pump is connected to the outlet end of the reservoir with a PVC pipe; (d) Burying of seepage wells: Lay seepage wells according to the position of the drain pipes, backfill the gaps between adjacent seepage wells with original soil, compact and level them, and then lay a water collection pipe, and connect one end of the water collection pipe to the well cover of the seepage well. The well includes a well pool, a water filtering well plate and a well cover, the well cover is arranged on the well pool, the water filtering well plate is arranged in the well pool, the water filtering well plate is evenly distributed with permeable holes, and the water filtering well plate is There are fixed protrusions symmetrically distributed on the top, and installation grooves are symmetrically distributed in the well pool. The installation grooves are matched with the fixed protrusions. The side of the well pool is provided with a drain port, and the well cover is provided with a water inlet ; (e) Brick laying: wrap the infiltration pipe with permeable geotextile in advance, then connect the wrapped infiltration pipe to the nozzle of the water collection pipe, and secure it so that the nozzle of the infiltration pipe is flush with the ground. According to the layout of the infiltration pipe, use ash The line marks the seepage ditch area, the width of the seepage ditch is 50-80mm larger than the diameter of the seepage pipe, and then a reverse filter layer is laid between the adjacent seepage ditch areas. A gravel layer with a thickness of ~150cm and a sandy soil layer with a thickness of 200 ~ 250mm are divided into a tiled area and a green area. The green area is distributed on both sides of the tiled area. Compact and level and water for maintenance; (f) Greening: chisel off the sandy soil on the surface of the green area, form slopes on both sides to the seepage ditch area, control the slope by 2% to 3%, pile up the chiseled sandy soil into mounds, and set one horizontally every 2 to 3m, then Lay turf and plant shrubs in the green area, and then lay a 80-100mm-thick centimeter stone layer in the seepage ditch area, compact it flat, and cut the part of the infiltration pipe beyond the centimeter stone layer to make it level with the top surface of the centimeter stone layer. , and then cover the mouth of the infiltration pipe with a tree pond cover, and dig a drainage ditch with a width of 30 to 50 mm every 3 to 5 m in the green area. The direction of the drainage ditch is consistent with the grading direction. 2. the construction method of a kind of sponge city green space water storage system according to claim 1, is characterized in that: when laying waterproof geomembrane in step (a), take foundation pit center as laying starting point, lay to both sides, level After pressing, fix it with cement nails every 2-3m. 3. the construction method of a kind of sponge city green space water storage system according to claim 1, is characterized in that: in step (d), before laying seepage well, fix well pool first, align the installation groove according to the fixed protrusion. Install the well plate into the well pool, then inject cement slurry into the installation tank, clean up the slurry overflowing the installation tank at the same time, and then place the well cover on the well pool. 4. the construction method of a kind of sponge city green space water storage system according to claim 1, is characterized in that: in step (e), the method for watering and maintenance is to cover the whole tiled area with straw piles, and watering and maintenance , The curing time is 1 to 2 days. During the curing period, ensure that the straw pile is moist, and it is forbidden for idlers to step on it.

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