CN207582619U - A kind of Rain Garden based on sponge city - Google Patents

Abstract

The utility model relates to a rain garden based on a sponge city, which comprises a foundation pit arranged between sidewalks on both sides, an overflow well is arranged in the foundation pit, and a water outlet is arranged at the lower end of the overflow well. The water outlet is connected with the municipal pipeline through a connecting pipe, and an aquifer, a planting soil layer, a coarse sand layer, a filter layer, a crushed stone layer and an anti-seepage layer are sequentially arranged on the outside of the overflow well from top to bottom. The utility model has a reasonable structural design, and can reduce the runoff of the sponge city during heavy rain or rainy season, reduce the instantaneous flood peak flow, and effectively avoid washing away the soil on the planting soil layer.

Description

A rain garden based on sponge city

Technical field:

The utility model relates to a rain garden based on a sponge city.

Background technique:

The rapid development of cities and more and more large-scale construction have brought about safety problems represented by urban drainage and waterlogging while improving the living environment of human beings. Traditional urban construction is dominated by high-rise buildings, with a large number of reinforced concrete buildings, the urban hardening area is too large, but the green area is small; and the urban ground hardening area is too large, the surface runoff generated is difficult to infiltrate into the soil, and heavy rainfall Or when the rainfall is concentrated, the urban drainage pipe network bears huge pressure and cannot drain the rainwater away in a short time, resulting in the phenomenon of "looking at the sea in the city". The rainwater is quickly drained away with the pipe network, and more than 70% of the rainwater cannot be utilized, and the problem of urban water shortage is also difficult to solve. Faced with the increasing water security problems in cities, the new concept of "sponge city" was proposed to solve the urban interior and water problems, and the construction of a green, healthy and livable city has become the primary goal.

Rain garden is a new type of stormwater management measure, and the United States is the first country to propose the concept of this term. Ecological sustainable use is the design principle of the rain garden, and the design purpose of the rain garden is to effectively use rainwater and save water resources. Rainwater is stored through measures such as natural green spaces and artificially constructed wetlands, while forming a unique urban garden landscape. Rain gardens are an important practice in the construction of sponge cities. Combining rain gardens with sponge city construction can effectively solve urban waterlogging and water shortage problems and further promote the healthy development of ecological cities. However, when existing rain gardens encounter rainy seasons or heavy rains, due to the large surface runoff and instantaneous flood peak flow, not only the soil on the planting soil layer will be washed away, resulting in soil erosion, but also a waste of water resources.

Utility model content:

The purpose of the utility model is to provide a rain garden based on the sponge city in view of the above deficiencies, which has a reasonable structure design, can effectively reduce runoff, and reduce instantaneous flood peak flow.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a rain garden based on sponge city, including a foundation pit arranged between sidewalks on both sides, an overflow well is arranged in the foundation pit, and the overflow The lower end of the well is provided with a water outlet, and the water outlet is connected to the municipal pipeline through a connecting pipe. The outside of the overflow well is sequentially provided with an aquifer, a planting soil layer, a coarse sand layer, a filter layer, and gravel. layer and anti-seepage layer.

Further, the thickness of the planting soil layer is 40 cm, and the planting soil layer is composed of sand, compost, loamy soil and clay, wherein the content of sand is 60% to 85%, and the content of compost is 5% to 10% %, the content of clay shall not exceed 5%.

Further, the thickness of the coarse sand layer is 10 cm, and the grain size of the coarse sand in the coarse sand layer is less than 5 mm.

Further, the thickness of the gravel layer is 30 cm, and the particle size of the gravel in the gravel layer is 5-20 mm.

Further, the filter layer is a filter geotextile.

Further, the anti-seepage layer is an anti-seepage geotextile.

Further, vegetation buffer strips are provided on both sides of the foundation pit.

Compared with the prior art, the utility model has the following effects: the utility model has a reasonable structural design, and can reduce the runoff of the sponge city during heavy rain or rainy season, reduce the instantaneous flood peak flow, and effectively avoid washing away the soil on the planting soil layer .

Description of drawings:

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

In the picture:

1-walkway; 2-foundation pit; 3-overflow well; 4-connecting pipe; 5-water storage layer; 6-planting soil layer; 7-coarse sand layer; 8-filter layer; 9-gravel layer; 10 - Anti-seepage layer.

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

As shown in Figure 1, a rain garden based on the sponge city of the utility model includes a foundation pit 2 arranged between sidewalks 1 on both sides, an overflow well 3 is arranged in the foundation pit 2, and the overflow The lower end of the well 3 is provided with a water outlet, and the water outlet is connected to the municipal pipeline through a connecting pipe 4, and the rainwater in the overflow well is collected in the municipal pipeline or water treatment center through the connecting pipe, and the rainwater is collected or recycled; An aquifer 5 , a planting soil layer 6 , a coarse sand layer 7 , a filter layer 8 , a gravel layer 9 and an anti-seepage layer 10 are sequentially arranged on the outside of the flow well 3 from top to bottom.

In the present embodiment, the thickness of the planting soil layer 6 is 40 centimeters, and the planting soil layer 6 is formed by mixing sand, compost, loamy soil and clay, wherein the content of the sand is 60% to 85%, and the content of the compost is 5% to 10%, and the content of clay should not exceed 5%.

In this embodiment, the thickness of the coarse sand layer 7 is 10 cm, and the grain size of the coarse sand in the coarse sand layer 7 is less than 5 mm.

In this embodiment, the thickness of the gravel layer 9 is 30 cm, and the particle size of the gravel in the gravel layer 9 is 5-20 mm.

In this embodiment, the filter layer 8 is a filter geotextile to prevent particulate matter such as soil from entering the gravel layer; the filter geotextile mainly serves as a preliminary filter, and has a smooth surface, good wear resistance, and high strength. Good air permeability, fast water leakage and easy cleaning.

In this embodiment, the anti-seepage layer 10 is an anti-seepage geotextile to ensure that the infiltration does not affect the safety of surrounding buildings; the anti-seepage geotextile uses plastic film as the anti-seepage base material and is composited with non-woven fabric The material has a good anti-seepage effect, which is beneficial to collect the water infiltrated by rainwater into the soil, and drain and collect the water in the permeable pipe.

In this embodiment, vegetation buffer strips are provided on both sides of the foundation pit 2 .

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (7)

1. a kind of Rain Garden based on sponge city, including the foundation pit being arranged between the pavement of both sides, it is characterised in that： Overflow well is provided in the foundation pit, the lower end of the overflow well is provided with water outlet, and the water outlet is through a connecting tube and city Political affairs pipeline is connected, and the outside of overflow well is disposed with aquifer, planting soil layer, coarse sands layer, filter layer, rubble from top to bottom Layer and impervious barrier.

2. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The planting soil layer Thickness for 40 centimetres, planting soil layer is mixed by sand, compost, loamy soil and clay, and the content of wherein sand is 60%~85%, the content of compost is 5%~10%, and the content of clay is no more than 5%.

3. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The thickness of the coarse sands layer It is 10 centimetres to spend, and the grain size of coarse sands layer medium coarse sand is less than 5 millimeters.

4. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The thickness of the metalling It is 30 centimetres to spend, and the grain size of metalling medium stone is 5~20 millimeters.

5. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The filter layer was Filter geotextiles.

6. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The impervious barrier is anti- Ooze geotextiles.

7. a kind of Rain Garden based on sponge city according to claim 1, it is characterised in that：The both sides of the foundation pit It is provided with vegetation buffer strip.