CN106759825A - A kind of construction method of sponge urban green space water storage system - Google Patents

Abstract

The invention discloses a construction method of a water storage system for a green space in a sponge city, comprising the following steps: (a) establishing a foundation pit; (b) embedding a water storage tank; (c) placing water storage on the ground; (d) embedding a seepage well ; (e) paving bricks; (f) greening. The invention has the advantages of simple construction, low difficulty, orderly construction, easy control of construction quality, less construction equipment involved, low construction cost, good infiltration effect, relieves urban drainage pressure, increases underground water resources, reduces urban rain and flood, and improves urban environment.

Description

A construction method of a sponge city green space water storage system

technical field

The invention belongs to the field of water resource utilization in sponge cities, and in particular relates to a construction method of a water storage system for green space in sponge cities.

Background technique

With the advancement of urbanization, the increase of ground hardening has changed the original hydrological characteristics, resulting in increased rainwater runoff, frequent water accumulation on the road surface, and frequent large-scale water accumulation in some cities. The drop in groundwater level has intensified. In addition, the problem of water shortage in my country's cities is becoming more and more serious. The resource-based water shortage in the northern region and the water quality-based water shortage in the southern region. In this environment, the government proposed the goal of building a "sponge city" and supported it in various aspects such as policy and finance.

Sponge city, as the name suggests, is like a sponge. During the rainy period, it can quickly absorb, store, infiltrate, and purify rainwater, reduce rainwater runoff, and replenish groundwater; at the same time, when it is not raining, through a series of treatment measures and supporting pipe networks facilities to utilize the accumulated water, so that rainwater resources can be better integrated into the city's water supply and drainage system. Creating a reasonable sponge city water system can not only effectively protect the original ecosystem of the city, but also slowly restore the original damaged ecosystem, while minimizing the impact on the construction and development of the entire urbanization.

The traditional sponge city construction model is full of hardened roads. Whenever there is heavy rain, it mainly relies on "grey" facilities such as pipes, canals, and pump stations to drain water. The main planning and design concepts are "quick drainage" and "end-centralized" control. Rainwater is mainly drained through drainage facilities and cannot penetrate into the ground. It will cause waterlogging every time it rains, and the drought and flood will turn sharply, which does not meet the requirements of sponge city construction.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a construction method for the water storage system of the sponge city green space, which is simple in construction, low in difficulty, orderly in construction, easy to control in construction quality, involves less construction equipment, and is easy to construct. Low cost, good infiltration effect, relieve urban drainage pressure, increase groundwater resources, reduce urban rain and flood, and improve urban environment.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A construction method of a sponge city green space water storage system, characterized in that it comprises the following steps:

(a) Establishing the foundation pit: According to the design and construction drawings, excavate the foundation pit to the design depth, do a good job of protecting the foundation pit wall, clean and level the bottom of the pit and suppress the base, and lay a waterproof geomembrane on the base, And backfill a 5-8cm thick original soil protective layer on the waterproof geomembrane, tamping and leveling to ensure the flatness and verticality of the foundation pit, which can improve the anti-seepage effect, and the protection of the pit wall can prevent the foundation pit from collapsing and landslides. To ensure the construction quality;

(b) Reservoir embedding: Build a reservoir and bury drainage pipes on the original soil protection layer. After the reservoir is built, wrap it with a waterproof geomembrane. The distance between each row of drainage pipes is 4-5m. The water outlets of each row of drainage pipes are uniformly connected to the multi-way pipes, and the water outlets of the multi-way pipes are connected to the reservoir, and the reservoir is buried by backfilling with original soil. The backfilling height is 550-600mm, and artificial Tamping, wrapping the reservoir with a waterproof geomembrane can prevent the rainwater stored in the reservoir from seeping out, and can also prevent the surrounding original soil from invading the reservoir, reducing the squeezing effect on the reservoir and protecting it. Layered compaction can increase the compactness of the filling, thereby increasing the strength of the covering soil and preventing the foundation pit from collapsing;

(c) Ground water storage in place: fix the water storage tank and the pump on the ground within 3m around the foundation pit respectively, connect the outlet end of the water pump to the water storage tank with a PB pipe, and protect and support the PB pipe , the water inlet end of the water pump is connected to the water outlet end of the reservoir with a PVC pipe, and the rainwater collected in the water reservoir is pumped into the water storage tank through the water pump for storage. The stored rainwater can replace some urban tap water and groundwater. It is used for greening irrigation, road cleaning, replenishing water body landscape, flushing toilets, etc., and can also be used as a supplementary water source for park landscape water bodies, which greatly improves the resource utilization efficiency of rainwater, turns waste into treasure, alleviates the problem of water resource scarcity, and reduces water and soil pollution. Loss is of great significance to the construction of ecological agriculture, ecological cities and environmental protection;

(d) Embedding of seepage wells: Lay seepage wells according to the location of the drainage pipes, backfill the gaps between adjacent seepage wells with original soil, tamp and level them, and then lay water collecting pipes, and connect one end of the water collecting pipes to the manhole covers of the seepage wells, and the seepage wells will also It can be used to collect rainwater. When the collection limit of the seepage well is exceeded, the excess rainwater will be transported downward through the drain pipe, and all the excess rainwater collected will be stored in the storage tank;

(e) Brick laying: Wrap the permeation pipe with permeable geotextile in advance, then connect the wrapped permeation pipe with the nozzle of the water collection pipe, and fix it firmly so that the nozzle of the permeation pipe is flush with the ground. According to the layout of the permeation pipe, use ash Line marks the seepage ditch area, the width of the seepage ditch is 50-80mm larger than the diameter of the permeation pipe, and then the reverse filter layer is laid between the adjacent seepage ditch areas. The reverse filter layer is 100-150mm thick gravel layer, 100 The gravel layer with a thickness of ~150cm and the sand layer with a thickness of 200-250mm are divided into brick-paved area and green area. The green area is distributed on both sides of the brick-paved area. The brick-paved area is paved with permeable bricks and permeable concrete. Compacted and leveled and watered for maintenance, permeable bricks and permeable concrete have good air permeability and water permeability, which can make rainwater infiltrate quickly, thereby relieving the pressure of urban drainage and flood control. After the rainwater enters the filter layer, the rainwater in the filter layer Migration occurs, rainwater can only infiltrate downward through the pores, the flow rate is slow, and the residence time is long. The gravel layer, gravel layer and sand layer have adsorption capacity, which can absorb the organic particles in the rainwater and be degraded by anaerobic microorganisms growing in the pores. , the purified rainwater is stored in the shallow soil, which can increase the water content of the shallow soil, adjust the climate, curb the urban heat island effect, and also reduce the peak flow of runoff and the threat of flood disasters. Minimize surface runoff;

(f) Greening: Gouging off the sand and soil on the surface of the green area, forming slopes on both sides to the seepage ditch area, controlling the slope at 2% to 3%, and then laying turf and planting shrubs in the green area, and then laying 80~ The 100mm thick centimeter stone layer should be compacted and leveled. Cut off the part of the permeation pipe that exceeds the centimeter stone layer so that it is level with the top surface of the centimeter stone layer. The rainwater that exceeds the permeable capacity of the permeable bricks is drained to the seepage ditch to speed up the drainage efficiency. The rainwater enters the permeation pipe along the pores of the tree pool cover, and then the permeation pipe transports the rainwater downward. During the flow of rainwater in the green area, the green area The plants inside can intercept the rainwater and increase the residence time of rainwater in the green area. The root system of the plants can purify the suspended solids and impurities in the rainwater runoff. The rainwater infiltrates directly into the reverse filter layer. It is adsorbed and filtered by the reverse filter layer, and the purified rainwater is stored in the shallow soil, which not only increases the water resource storage of the soil, but also reduces the irrigation water consumption of the green space. On the other hand, the soil intercepts and filters the rainwater fully. , improve the quality of infiltrated rainwater, and improve the groundwater environment.

Further, in step (f), pile up the chiseled sand and soil into mounds, set up one every 2-3m in the horizontal direction, and use the ups and downs of the micro-topography to prolong the time and distance of rainwater flowing in the green area, so that the rainwater can seep back to the greatest extent , to prevent soil erosion caused by heavy rainfall.

Further, in step (f), excavate a drainage ditch with a width of 30-50mm every 3-5m in the green area, the direction of the drainage ditch is consistent with the direction of the slope, and the drainage ditch plays a diversion role, so that the rainwater quickly flows into the seepage ditch Drain in the same direction to reduce the infiltration pressure in the green area, directly drain the rainwater into the seepage ditch, and transport the excess rainwater downward through the infiltration pipe.

Further, when laying the waterproof geomembrane in step (a), the center of the foundation pit is used as the starting point for laying, and it is laid to both sides, flattened and then pressed, and fixed with cement nails every 2 to 3m to prevent the waterproof geomembrane from wrinkling and protruding. Waste when laying, saving material cost.

Further, in step (d), before laying the seepage well, first fix the well pool, install the water filter well plate into the well pool according to the way that the fixing protrusion is aligned with the installation groove, then inject cement slurry into the installation groove, and clean up the overflow installation at the same time The slurry of the tank, and then put the manhole cover on the well pool, the structure of the seepage well is stable, the strength is reliable, the construction is convenient, and the installation efficiency is high.

Further, in the step (d), the seepage well includes a well pool, a water filter well plate and a well cover, the well cover is arranged on the well pool, the water filter well plate is arranged in the well pool, the water permeable holes are evenly distributed on the water filter well plate, and the water filter well plate is symmetrically distributed. Fixed protrusions, installation grooves are symmetrically distributed in the well pool, the installation grooves match the fixed protrusions, the side of the well pool is provided with drain outlets, and the well cover is provided with water inlets. During construction, it is only necessary to align the installation grooves with the fixed protrusions. Install the water filter well plate into the well pool, and then inject cement slurry into the installation groove, so that the water filter well plate is bonded and fixed on the inner wall of the well pool. The operation is simple, fast and effective, and the construction efficiency is high; the water filter well plate acts as a block Due to the effect of rainwater, rainwater can only continue to infiltrate downward through the permeable holes, and the residual fixed particles in the rainwater are blocked on the surface of the filter well plate, unable to fall, and the impurities are separated; the seepage well is used as a container for collecting rainwater, and the rainwater is stored in the ground. Does not take up floor space.

Further, the method of watering and curing in step (e) is to cover the entire brick-laying area with straw piles, and watering and curing. The curing time is 1 to 2 days. During the curing period, ensure that the straw piles are moist and prohibit idlers from stepping on them. Watering maintenance can ensure the strength of permeable bricks and permeable concrete, prevent cracks, and maintain the water permeability of permeable bricks.

The present invention has the following beneficial effects due to the adoption of the above technical solution:

The invention has the advantages of simple construction, low difficulty, orderly construction, easy control of construction quality, less construction equipment involved, low construction cost, and good permeation effect. Permeable bricks and permeable concrete are used for paving, so that rainwater can seep rapidly, and the super-permeable part enters In the green area, the plants in the green area can intercept the rainwater and increase the residence time of the rainwater in the green area. The plant root system can purify the suspended solids and impurities in the rainwater runoff, and the rainwater infiltrates directly and directly. After the rainwater enters the reverse filter layer, the rainwater migrates in the reverse filter layer, and the rainwater can only infiltrate downward through the pores, with a slow flow rate and a long residence time. The gravel layer, gravel layer and sand layer have adsorption capacity. The organic particles in the rainwater are adsorbed and degraded by the anaerobic microorganisms growing in the pores, and the purified rainwater is stored in the shallow soil, which can increase the water content of the shallow soil, regulate the climate, curb the urban heat island effect, and reduce Runoff pollution and the threat of flood disasters, the rainwater that reaches the seepage ditch enters the permeation pipe along the pores of the tree pond cover plate, and then the rainwater is transported downward by the permeation pipe, and sent to the seepage well through the water collection pipe, and the seepage well serves as a collection The rainwater container stores rainwater underground without occupying the ground space. The filter well plate plays the role of blocking rainwater. Rainwater can only continue to infiltrate downward through the permeable holes, and the residual fixed particles in the rainwater are blocked on the surface of the filter well plate , unable to fall, separated impurities. When the amount of rainwater exceeds the collection limit of the seepage well, the excess rainwater will be transported downward through the drainage pipe, and finally all the excess rainwater collected will be stored in the storage tank, and the rainwater collected in the storage tank will be pumped into the storage tank through the pump Stored in tanks, the stored rainwater can replace part of urban tap water and groundwater, and can be used for green irrigation, road cleaning, supplementary water body landscape, flushing toilets, etc. It can also be used as a supplementary water source for park landscape water bodies, greatly improving the resource utilization of rainwater Efficiency, turning waste into treasure, transforming time-space discontinuous and unstable rainwater resources into a stable system with continuous water supply capacity, becoming water resources that can be used comprehensively by urban green spaces, alleviating the problem of water resource scarcity, and contributing to the construction of ecological agriculture , eco-city, and environmental protection are all of great significance.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of a kind of sponge city green space water storage system among the present invention;

Fig. 2 is the structural representation of seepage well among the present invention;

Fig. 3 is the structural representation of filter well plate among the present invention;

Fig. 4 is a schematic flowchart of a construction method of a sponge city green space water storage system according to the present invention.

In the figure: 1-foundation pit; 2-reservoir; 3-drainage pipe; 4-multi-way pipe; 5-water storage tank; 6-pump; 7-seepage well; 8-well pool; 9-filter well Plate; 10-well cover; 11-permeable hole; 12-fixed protrusion; 13-installation groove; 14-drainage port; 15-water inlet; 16-collection pipe; Gravel layer; 20-gravel layer; 21-sand layer; 22-brick area; 23-green area; 24-tree pool cover.

detailed description

As shown in Figures 1 to 4, it is a construction method of a sponge city green space water storage system of the present invention, comprising the following steps:

(a) Establish the foundation pit: According to the design and construction drawings, excavate the foundation pit 1 to the design depth, and protect the wall of the foundation pit 1 to prevent the occurrence of subsidence and landslides in the foundation pit 1, so as to ensure the construction quality. Clean and level the bottom of the pit and suppress the base, lay a waterproof geomembrane on the base, and backfill a 5-8cm thick original soil protective layer on the waterproof geomembrane, compact and level, the original soil protective layer can prevent waterproof geomembrane The membrane is damaged in the later construction and plays a protective role. Ensuring the flatness and verticality of the foundation pit 1 can improve the anti-seepage effect. When laying the waterproof geomembrane, start from the center of the foundation pit 1, lay it on both sides, flatten it and press it, and fix it with cement nails every 2-3m to prevent the waterproof geomembrane from wrinkling and protruding, avoiding waste during laying and saving materials cost.

(b) Reservoir embedding: Build the reservoir 2 and bury the drainage pipe 3 on the original soil protection layer. After the reservoir 2 is built, wrap it with a waterproof geomembrane, and waterproof the reservoir 2. Wrapped with geomembrane, it can prevent the rainwater stored in the reservoir 2 from seeping out, and can also prevent the surrounding original soil from invading the reservoir 2, so as to reduce the extrusion effect on the reservoir 2 and play a protective role. The distance between each row of drainage pipes 3 is 4-5m, and the outlet ends of each row of drainage pipes 3 are connected to the multi-way pipe 4, and the outlet ends of the multi-way pipes 4 are connected to the reservoir 2, and the reservoir 2 is backfilled with original soil. Buried, the backfill height is 550-600mm, and manual compaction is performed for every 150-200mm of filling. Layered compaction can increase the compactness of the filling, thereby increasing the strength of the covering soil and preventing the foundation pit 1 from collapsing.

(c) Ground water storage in place: fix the water storage tank 5 and the water pump 6 on the ground within 3m around the foundation pit 1 respectively, and connect the water outlet end of the water pump 6 to the water storage tank 5 with a PB pipe, and connect the PB The pipe is protected, supported and fixed to prevent the PB pipe from shaking and being entangled during the drainage process of the water pump 6, which affects the drainage efficiency. The water inlet end of the water pump 6 is connected to the water outlet end of the water storage tank 2 with a PVC pipe, and the rainwater collected in the water storage tank 2 is pumped into the water storage tank 5 through the water pump 6 and stored, and the stored rain water can replace some cities Tap water and groundwater are used for green irrigation, road cleaning, supplementary water landscape, flushing toilets, etc., and can also be used as supplementary water sources for park landscape water bodies, which greatly improves the resource utilization efficiency of rainwater, turns waste into treasure, and alleviates the scarcity of water resources The problem of reducing soil erosion is of great significance to the construction of ecological agriculture, ecological city and environmental protection.

(d) Embedding of seepage wells: seepage well 7 includes well pool 8, water filter well plate 9 and well cover 10, well cover 10 is set on well pool 8, water filter well plate 9 is set in well pool 8, and water filter well plate 9 is evenly distributed There are water permeable holes 11, fixed protrusions 12 are symmetrically distributed on the filter well plate 9, installation grooves 13 are symmetrically distributed in the well pool 8, and the installation grooves 13 match the fixed protrusions 12, and the side of the well pool 8 is provided with drain outlets 14 , the well cover 10 is provided with a water inlet 15, and only needs to install the water filter well plate 9 into the well pool 8 according to the way that the fixed protrusion 12 is aligned with the installation groove 13 during construction, and then inject cement slurry into the installation groove 13, so that the filter The water well plate 9 is bonded and fixed on the inner wall of the well pool 8, and the operation is simple, fast and effective, and the construction efficiency is high. The water filter well plate 9 plays the effect of blocking rainwater, and the rainwater can only continue to infiltrate downwards through the permeable holes 11, and the residual fixed particles in the rainwater are blocked on the water filter well plate 9 surface, unable to fall, and separate impurities. 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 seepage well 7, first fix the well pool 8, install the water filter well plate 9 into the well pool 8 according to the way that the fixing protrusion 12 is aligned with the installation groove 13, then inject cement slurry into the installation groove 13, and clean up the overflow at the same time Install the slurry of the groove 13, then put the well cover 10 on the well pool 8, the seepage well 7 has stable structure, reliable strength, convenient construction and high installation efficiency. Lay seepage well 7 according to the position of drainpipe 3, drainpipe 3 is connected to the outfall 14 of well pond 8, backfill the gap between adjacent seepage wells 7 with original soil, tamp and level off, then lay water collecting pipe 16, collect The water pipe 16 is connected to the water inlet 15 of the manhole cover 10, and the seepage well 7 can also be used to collect rainwater. When the collection limit of the seepage well 7 is exceeded, the excess rainwater is conveyed downward through the drain pipe 3, and finally all the excess rainwater collected enters the storage tank 2 unified storage.

(e) Brick laying: Wrap the permeable pipe 17 with permeable geotextile in advance, then connect the wrapped permeable pipe 17 with the mouth of the water collection pipe 16, and firmly make the mouth of the permeable pipe 17 flush with the ground. 17 layout, mark the seepage ditch area 18 with a gray line, the width of the seepage ditch is 50-80mm larger than the diameter of the seepage pipe 17, and then lay the reverse filter layer between the adjacent seepage ditch areas 18, and the reverse filter layer is 100-80 mm from bottom to top 150mm thick crushed stone layer 19, 100-150cm thick gravel layer 20 and 200-250mm thick sand layer 21 are divided into brick-laying area 22 and green area 23, and green area 23 is distributed on both sides of brick-laying area 22. The brick area 22 is paved with permeable bricks and permeable concrete. After the paving is completed, it is compacted and leveled and watered for maintenance. The method of watering and maintenance is to cover the entire brick area 22 with straw piles and water for maintenance. The maintenance time is 1-20 hours. For 2 days, during the maintenance period, the straw pile should be kept moist, and idlers are prohibited from stepping on it. Watering and curing can ensure the strength of the permeable bricks and pervious concrete, prevent cracks, and maintain the water permeability of the permeable bricks. Permeable bricks and permeable concrete have good air permeability and water permeability, which can quickly infiltrate rainwater, thereby relieving the pressure of urban drainage and flood control. After the rainwater enters the filter layer, the rainwater migrates in the filter layer, and the rainwater can only pass through The pores permeate downward, the flow rate is slow, and the residence time is long. The gravel layer 19, the gravel layer 20 and the sand layer 21 all have adsorption capacity, which can absorb the organic particles in the rainwater and be degraded by the anaerobic microorganisms growing in the pores. Rainwater is stored in the shallow soil, which can increase the water content of the shallow soil, adjust the climate, and curb the urban heat island effect. At the same time, it can also reduce the peak flow of runoff and the threat of flood disasters. Runoff.

(f) Afforestation: chisel off the sand and soil on the surface of the green area 23 to form slopes on both sides to the seepage ditch area 18, control the slope at 2% to 3%, accumulate the chiseled sand and soil into mounds, and set one every 2 to 3m in the horizontal direction , using the ups and downs of the micro-topography to prolong the time and distance of rainwater flowing in the green area 23, so as to maximize the reinfiltration of rainwater and prevent soil erosion caused by heavy rainfall. Then lay turf and plant shrubs in the green land area 23, then lay an 80-100mm thick centimeter stone layer in the seepage ditch area 18, compact and level off, and cut off the part of the infiltration pipe 17 exceeding the centimeter stone layer so that it is in line with the centimeter stone layer. The top surface of the layer is flat, and then the mouth of the permeation pipe 17 is covered with the tree pool cover plate 24, and the sloping terrain makes the rainwater beyond the permeable brick seepage capacity drain to the seepage ditch, speeding up the drainage efficiency, and the rainwater flows along the tree pool cover plate 24 The hollowed-out design of the tree pool cover plate 24 filters and separates the rainwater once, and then the second time is filtered by the permeable geotextile that wraps the permeable pipe 17. Pipe 17 carries rainwater downwards.

During the flow of rainwater in the green area 23, the plants in the green area can intercept the rainwater, increase the residence time of the rainwater in the green area 23, and the plant roots can purify the suspended solids and impurities in the rainwater runoff. In-situ infiltration, directly infiltrated into the reverse filter layer, absorbed and filtered by the reverse filter layer, and the purified rainwater is stored in the shallow soil, which not only increases the water resource storage of the soil, but also reduces the water consumption of the green space. Make full use of the intercepting and filtering effect of soil on rainwater, improve the quality of infiltrated rainwater, and improve the groundwater environment. Dig a drainage ditch with a width of 30-50mm every 3-5m in the green area 23. The direction of the drainage ditch is consistent with the direction of the slope. The infiltration pressure in the area 23 directly discharges the rainwater into the seepage ditch, and the excess rainwater is transported downward by the infiltration pipe 17 .

The invention has the advantages of simple construction, low difficulty, orderly construction, easy control of construction quality, less construction equipment involved, low construction cost, and good permeation effect. Permeable bricks and permeable concrete are used for paving, so that rainwater can seep rapidly, and the super-permeable part enters In the green area 23, the plants in the green area can intercept rainwater, increase the residence time of rainwater in the green area 23, and the root system of the plants can purify the suspended solids and impurities in the rainwater runoff, and the rainwater can infiltrate on the spot. Directly infiltrate into the reverse filter layer. After the rainwater enters the reverse filter layer, the rainwater migrates in the reverse filter layer. The rainwater can only infiltrate downward through the pores, the flow velocity is slow, and the residence time is long. All have adsorption capacity, absorbing organic particles in rainwater, degraded by anaerobic microorganisms growing in pores, and storing purified rainwater in shallow soil, which can increase the water content of shallow soil, regulate climate, and curb urban heat island effect At the same time, it can also reduce the pollution of runoff and the threat of flood disasters. The rainwater that reaches the seepage ditch enters the permeation pipe 17 along the pores of the tree pond cover plate 24, and then the rainwater is transported downward by the permeation pipe 17, and then sent to the water through the water collection pipe 16. In the seepage well 7, the seepage well 7 is used as a container for collecting rainwater, and the rainwater is stored underground without occupying the ground space. The filter well plate 9 plays a role in blocking the rainwater, and the rainwater can only continue to infiltrate downward through the permeable hole 11. The fixed particles remaining in the rainwater are blocked on the surface of the water filter well plate 9, unable to fall, and the impurities are separated. When the amount of rainwater exceeds the collection limit of the seepage well 7, the excess rainwater is conveyed downward through the drain pipe 3, and finally all the excess rainwater collected enters the reservoir 2 for unified storage, and the water collected in the reservoir 2 is collected by the pump 6. The rainwater is pumped into the water storage tank 5 and stored, and the stored rainwater can replace part of urban tap water and groundwater, and can be used for greening irrigation, road cleaning, supplementary water body landscape, flushing toilets, etc., and can also be used as a supplementary water source for park landscape water bodies, greatly Improve the resource utilization efficiency of rainwater, turn waste into treasure, transform the time-space discontinuous and unstable rainwater resources into a stable system with continuous water supply capacity, become water resources that can be comprehensively utilized by urban green spaces, and alleviate the scarcity of water resources It is of great significance to the construction of ecological agriculture, ecological city and environmental protection.

The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are covered by the protection scope of the present invention.

Claims (7)

1. the construction method of a kind of sponge urban green space water storage system, it is characterised in that comprise the following steps：

A () sets up foundation ditch：According to design working drawing, excavation pit carries out the protection of foundation ditch crater wall to projected depth, and hole bottom is carried out Cleaning, leveling are simultaneously suppressed to basic unit, and waterproofing geomembrane is set on basic unit upper berth, and it is thick that 5~8cm is backfilled on waterproofing geomembrane Original soil protective layer, tamp it is smooth；

B () cistern is buried：Build cistern and embedded drainpipe by laying bricks or stones on original soil protective layer, cistern is built by laying bricks or stones after finishing and uses waterproof In geomembrane is wrapped in, it is 4~5m often to arrange draining tube pitch, and the unification of each row's drainpipe water side is docked on many siphunculus, Cistern is accessed into many siphunculus water sides, is backfilled with original soil and is buried cistern, backfill height is 550~600mm, often fills out 150 ~200mm carries out hand compaction；

C () ground water storage is in place：Water tank and suction pump are separately fixed on the ground in the range of the 3m of foundation ditch periphery, suction pump Water side connect water tank with PB pipes, and protection support carried out to PB pipes fix, the water inlet end of suction pump is connected with pvc pipe and stored The water side in pond；

D () filter well is buried：Position laying filter well according to drainpipe, the space between adjacent filter well is backfilled with original soil, Compacting is smooth, then lays collector pipe, and collector pipe one end is connected the well lid of filter well；

(e) tile work：Osmos tube is wrapped up with permeable geotextiles in advance, then by the osmos tube after parcel and the mouth of pipe pair of collector pipe Connect, reinforce, the osmos tube mouth of pipe is flushed with ground, be laid out according to osmos tube, seepage ditch region, seepage ditch width are marked with gray line More than infiltration 50~80mm of pipe diameter, loaded filter is then laid between adjacent seepage ditch region, loaded filter is from the bottom to top successively It is 100~150mm thick metalling, 100~150cm thick gravel layer and the thick sandy soil layers of 200~250mm, divides tile work area Domain and greenery patches region, greenery patches area distribution use water-permeable brick and pervious concrete making in the both sides in tile work region, tile work region, After laying is finished, smooth and water seasoning is tamped；

F () afforests：Chisel removes the sandy soil of greenery patches region surface, forms both sides to seepage ditch region slope, controls the gradient 2%~3%, Then turf, plantation shrub are laid in the region of greenery patches, the thick centimetre stones of 80~100mm is then laid in seepage ditch region Layer, compacting is smooth, by osmos tube beyond the part severing of centimetre rock layers, is allowed to maintain an equal level with centimetre rock layers top surface, then with tree pond Cover plate covers the osmos tube mouth of pipe.

2. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step The sandy soil for going will be dug in (f) and is piled into mound, laterally set one every 2~3m.

3. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step Every the gutter that 3~5m, one width of excavation is 30~50mm, gutter direction and slope direction in the region of greenery patches in (f) Unanimously.

4. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step It is laying starting point with foundation ditch center in (a) when waterproofing geomembrane is laid, is laid to both sides, presses neat after evening up, every 2~3m It is fixed with cement nail.

5. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step In (d) before filter well is laid, Jing Chi is first fixed, water filter well plate is loaded by Jing Chi according to the mode that fixed lobe is directed at mounting groove It is interior, then to cement mortar is injected in mounting groove, while clearing up the slurries for overflowing mounting groove, then well lid is shelved on Jing Chi.

6. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step D filter well described in () includes Jing Chi, water filter well plate and well lid, on the Jing Chi, the water filter well plate sets the well lid In permeable hole in the well pond, is evenly distributed with the water filter well plate, fixed lobe is symmetrically distributed with the water filter well plate, Mounting groove is symmetrically distributed with the well pond, the mounting groove matches with the fixed lobe, and the side of the Jing Chi is provided with Discharge outlet, the well lid is provided with water inlet.

7. the construction method of a kind of sponge urban green space water storage system according to claim 1, it is characterised in that：Step E the method for water seasoning is to cover full wafer tile work region, and water seasoning with stack of rice straw in (), curing time is 1~2 day, is supported Ensure stack of rice straw moistening during shield, and forbid idler to trample thereon.