CN208701843U - A kind of novel rainwater pollutant delay facility for sponge city - Google Patents

Abstract

The utility model is a kind of novel rainwater pollutant delay facility for sponge city, including vegetable layer, aquifer, coating, plantation layer, packing layer, sand filter blanket and gravel drainage blanket, the vegetable layer, aquifer, coating, plantation layer, packing layer, sand filter blanket and gravel drainage blanket are set gradually from top to bottom, after urban road rainwater flows through multiple filtration delay, there is good removal effect to pollutant, and can be reduced runoff volume.

Description

A kind of novel rainwater pollutant delay facility for sponge city

Technical field

Being detained facility more particularly to one kind the utility model relates to a kind of rain water pollutant for sponge city has multilayer The rain water pollutant of filter layer is detained facility.

Background technique

With China's economic development, urban residential land area is continuously increased, and city development construction is more extensive, and city is certainly Right earth's surface is substituted by the waterproof hard material of residential area, so that seeping under the nature of rainwater, purification and collection are faced and chosen greatly very much War causes big city that can all occur the phenomenon that " meet rain must flood, i.e. non-irrigated after rain " every year, at the same caused water environment pollution, water provides A series of problems, such as source is in short supply, water security lacks guarantee, aqueous culture disappears.Effectively to solve these problems, country proposes to promote Sponge urban construction.

Application publication number is the patent of invention of CN108298611A, and it is stagnant to disclose a kind of biological cleaning for sponge city Band is stayed, main to realize the purification purpose to urban rainwater using the multiple purifying layers being arranged, this biological cleaning stranded belt is whole For infundibulate and external upper surrounding is provided with cofferdam, the purpose is to be detained urban rainwater more, is detained rainwater and is passing through It crosses after the purification of multiple purifying layers and reaches aquifer by pervious bed, will be purified by the water-permeable pipe and drainpipe of aquifer bottom Rainwater discharge afterwards.But it will be apparent that this biological cleaning stranded belt whole design is excessively complicated, raw material needed for each layer It is required that high, implement that cost is very high and enforcement difficulty is big, is unfavorable for the popularization construction in sponge city.

For this purpose, the utility model provides a kind of rain water pollutant delay facility being more easily implemented and effect is good.

Summary of the invention

In order to solve the above technical problems, the utility model uses following technical scheme:

A kind of novel rainwater pollutant delay facility for sponge city, including vegetable layer, aquifer, coating, kind Plant layer, packing layer, sand filter blanket and gravel drainage blanket, the vegetable layer, aquifer, coating, plantation layer, packing layer, sand filter blanket It sets gradually with gravel drainage blanket, after urban road rainwater flows through multiple filtration delay, has to pollutant good from top to bottom Removal effect.

Further, the plantation layer is sandy soil, and thickness is no less than 250mm, and the sand grain content of sandy soil is high, Grain is thick, and the intergranular macrovoid quantity of composition is more, so soil aeration good water permeability, soil body internal drainage is unobstructed, be not likely to produce support water, Waterlogging and perched water.

Further, landscape vegetation is planted on plantation layer, planted vegetation forms vegetable layer.

Further, bedding branch, tree root, bark or leaf on the plantation layer form coating, the overburden cover For 30mm.

Further, for the aquifer between vegetable layer and coating, height is no less than 200mm, and the aquifer 100mm is no less than apart from ground.

Further, described filler layer is by 80% river sand, 5% clay, 5% clinker, 5% flyash and 5% Humus composition, with a thickness of 250mm, clay, clinker and flyash adsorption activity all with higher, clay is after water-wet is moistened Elecrtonegativity is had on grain, therefore has good physical adsorbability and chemical mobility of the surface, and humus, which can increase, allows air and water The gap of entrance, and nitrogen, sulphur, potassium and phosphorus needed for plant growth can be generated.

Further, the sand filter blanket selects medium coarse sand, and with a thickness of 50mm, the fineness modulus of medium coarse sand is high, fine powder content Few, voidage is big.

Further, the gravel drainage blanket selects the clean gravel that partial size is 12-35mm to form, thickness 100mm.

The utility model has the beneficial effects that each layer structure for being detained facility to rain water pollutant has carried out simplified adjustment, store Water layer, coating and the position setting for planting layer improve the water storage effect of aquifer to provide sufficient water for plantation layer Point, the two complements each other, and forms good circulation.Packing layer can remove the pollutant in runoff rainwater, and have chosen and denitrogenate The nutrients such as phosphorus and the optimal filler of heavy metal contaminants effect.Sand filter blanket can precipitate rainwater, and gravel drainage blanket can provide One temporary rainwater storage space reduces runoff volume.

So the utility model can effectively remove nutrients and the heavy metal contaminants such as the nitrogen phosphorus in rainwater, purification Runoff rainwater, while rainwater can be efficiently used again, underground water is covered, is played a role for the utilization of urban rainwater, truly Realize the purpose of design for reducing rainfall runoff and returning urban utilization in sponge city.

Detailed description of the invention

FIG. 1 is a schematic structural view of the utility model.

In figure: vegetable layer -1；Aquifer -2；Coating -3；Plant layer -4；Packing layer -5；Sand filter blanket -6；Gravel draining Layer -7.

Specific embodiment

As shown in Figure 1, it includes vegetable layer, aquifer, bark that the novel rainwater pollutant is detained facility from top to bottom Coating, plantation layer, packing layer, sand filter blanket and gravel drainage blanket.The vegetable layer, aquifer, coating, plantation layer, filler Layer, sand filter blanket and gravel drainage blanket are set gradually from top to bottom.

Wherein, plantation layer is sandy soil, and thickness is no less than 250mm, plants landscape vegetation on plantation layer, is planted Vegetation forms vegetable layer.Since sandy soil ventilating permeable is good, soil body internal drainage is unobstructed, so that vegetation is easier to absorb moisture It is easier to grow.Bedding branch, tree root, bark or leaf on plantation layer, form coating, with a thickness of 30mm.Coating is advantageous In the growth of vegetation, moisture can be saved for plantation layer.

Aquifer is between vegetable layer and coating, and height is no less than 200mm, and aquifer is no less than apart from ground 100mm.Packing layer below aquifer is by 80% river sand, 5% clay, 5% clinker, 5% flyash and 5% Humus composition, with a thickness of 250mm, the rain water pollutant that the constituent of packing layer had both flowed into packing layer is effectively inhaled It receives, while the rainwater after being cleaned can effectively pass into sand filter blanket from packing layer.Also, the humic mass-energy in packing layer produces Nitrogen, sulphur, potassium and phosphorus needed for plant growth, the nutrient needed for capable of being grown to the vegetation supply of vegetable layer.

Sand filter blanket selects medium coarse sand, and with a thickness of 50mm, it is the clean gravel group of 12-35mm that gravel drainage blanket, which selects partial size, At thickness 100mm.

The utility model by using multi-ply construction be classified processing runoff rainwater, aquifer to collect runoff rainwater and Rainwater is temporarily stored when run-off is big.When runoff rainwater is via coating, because being paved with the coverings such as leaf, bark, reduce To directly washing away for surface soil layer, so can be reduced soil erosion, plant root can also be made to keep moist, be biological growth Medium is provided with decomposing organic matter, while the coverings such as leaf, bark can filter out larger pollutant and pass through suction-operated Primary filtration pollutant.Plantation layer is the place of vegetable layer plant growth, is made of, can play a role in filtering sandy soil, and And the microorganism that the root of plant is wherein distributed with and is attached on root, the organic matter in runoff rainwater can be decomposed, while to nitrogen phosphorus Equal nutrients and heavy metal contaminants have good absorption.

When runoff rainwater flows to packing layer, the river sand in packing layer can play further filtration, clay, clinker, powder Coal ash and humus all have extraordinary adsorption effect to phosphorus.All fillers of layer and packing layer are planted all to the city rain passed through Suspended matter (TSS) in water has filtration, then has suction-operated to the heavy metal element passed through.

Sand filter blanket is made of medium coarse sand, and gap is moderate, so can filter precipitating rainwater and prevent and treat packing layer little particle It is washed into gravel drainage blanket and causes draining inconvenient.Gravel drainage blanket is mainly used for providing a temporary rainwater storage space, Slow down rainwater mass rate of emission, reduces runoff volume.

Above embodiments are only the preferred forms of the utility model, but can not be interpreted as protecting the utility model The limitation of range.Without departing from the concept of the premise utility, other made deform those skilled in the art And improvement, belong to the protection scope of the utility model.

Claims (1)

1. a kind of novel rainwater pollutant for sponge city is detained facility, including vegetable layer and aquifer, it is characterised in that: It further include coating, plantation layer, packing layer, sand filter blanket and gravel drainage blanket, the vegetable layer, aquifer, coating, plantation Layer, packing layer, sand filter blanket and gravel drainage blanket are set gradually from top to bottom；

The plantation layer is sandy soil, and thickness is no less than 250mm, plants landscape vegetation, planted vegetation on plantation layer Form vegetable layer；

Bedding branch, tree root, bark or leaf on the plantation layer, form coating, and the overburden cover is 30mm；

The water storage layer height is no less than 200mm, and is no less than 100mm apart from ground；

Described filler layer is made of 80% river sand, 5% clay, 5% clinker, 5% flyash and 5% humus, With a thickness of 250mm；

The sand filter blanket selects medium coarse sand, with a thickness of 50mm；

The gravel drainage blanket selects the clean gravel that partial size is 12-35mm to form, thickness 100mm.