CN211849903U - A sloping rain garden - Google Patents

Abstract

The utility model particularly relates to a sloping field rainwater garden which can collect, purify and store rainwater for later use in the rain, drain water in time and prevent soil erosion in the heavy rain, and has better ecological and landscape effects; the rainwater filtering device comprises a foundation pit concavely arranged on a sloping field, and a rainwater filtering tank filled in the foundation pit and composed of a gravel layer, a permeable geotextile, a sand layer, an artificial packing layer, a planting soil layer and a covering layer which are sequentially laid from the bottom of the foundation pit upwards, wherein a rainwater collecting and permeable pipe communicated with a water tank and a drainage pipe communicated with a municipal rainwater pipe are embedded in the gravel layer, and a rainwater overflow pipe communicated with the drainage pipe is embedded in the rainwater filtering tank; the rainwater reduction area is a sloping dike formed by a planting soil layer, a argil particle layer and a gravel layer which are sequentially paved upwards from an original excavation soil layer; water-resistant plants are planted in the planting soil layer of the rainwater filtering tank, and green plants are planted in the planting soil layer of the rainwater slowing area.

Description

A sloping rain garden

technical field

The utility model relates to the technical field of municipal engineering, in particular to a rainwater garden on sloping land, which can collect, purify, and store rainwater for backup during rain, drain water in time during heavy rain, prevent soil erosion, and has better ecological and landscape effects.

Background technique

Rain gardens are naturally formed or artificially excavated shallow concave green spaces that are used to gather and absorb rainwater from roofs or ground, purify the rainwater through the combined action of plants and sand, and make it gradually penetrate into the soil, conserving groundwater, or It is an ecologically sustainable rainwater control and rainwater utilization facility to supply urban water such as landscape water and toilet water.

In recent years, due to the rapid urban construction and subsequent changes, urban waterlogging has become more and more serious. In addition to effectively utilizing the skeleton of the garden, rainwater gardens can induce rainwater into shallow green spaces to collect and collect rainwater. In addition to treatment and comprehensive utilization, it also has multiple functions: it can effectively remove suspended particles, organic pollutants, heavy metal ions, pathogens and other harmful substances in runoff; through reasonable plant configuration, rain gardens can provide insects and birds. Provide a good habitat environment; the transpiration of its plants in the rain garden can adjust the humidity and temperature of the air in the environment and improve the microclimate environment; the construction cost of the rain garden is lower, and the maintenance and management are simpler than that of the lawn; it is different from the traditional lawn landscape. In contrast, rain gardens can give people a new landscape perception and visual experience. It is precisely based on the above factors that rain gardens have an irreplaceable and important role in emphasizing urban greening ecology while transforming and improving the original landscape belt, and have been rapidly popularized in modern cities.

At present, the setting of urban rainwater gardens is mainly to solve the daily consumption and utilization of urban rainwater, and at the same time to improve the effect of urban landscape, but it cannot play a greater role when the rainstorm comes. Soil loss. In addition, most of the existing rain gardens are built on relatively flat terrain, and the collection of rainwater runoff from sloping land is not very good.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a sloping rainwater garden, which can collect, purify and store rainwater for backup during rain, drain water in time during heavy rain, prevent soil erosion, and has better ecological and landscape effects.

The purpose of this utility model is to realize through the following technical solutions:

A sloping rain garden, comprising a foundation pit recessed on the sloping ground and provided with a side slope around a pit opening, and a gravel layer, permeable geotextiles, The rainwater filter pond with water storage space is composed of sand layer, artificial filling layer, planting soil layer and covering layer. The rainwater collection permeable pipe connected with the water tank for storing purified rainwater and the drain pipe connected with the municipal rainwater pipe are embedded in the rainwater filter tank with a vertical rainwater overflow pipe connected with the drain pipe. The slope of the upper surface of the covering layer is 8°～12°; it also includes a rainwater mitigation area protruding from the water inlet of the foundation pit. The rainwater mitigation area is a sloping embankment composed of a planting soil layer, a clay particle layer and a gravel layer laid up in sequence from the original excavated soil layer. The slope of the backwater slope of the slope embankment is 38°～42°, the slope from the waterward slope of the slope embankment to the top of the slope embankment is 51°～54°, and the slope of the connection slope between the waterward slope and the slope land is 22°～54°. 25°; water-tolerant plants are planted in the planting soil layer of the rainwater filter tank, and green plants are planted in the planting soil layer of the rainwater mitigation area.

The beneficial effects of the present utility model are:

When the above sloping rain garden operates:

The water-resistant plants planted in the planting soil layer of the rainwater filter pond purify the rainwater contained in the foundation pit. The water-resistant plants and the green plants planted in the planting soil layer of the rainwater mitigation area form a ground landscape. The overall terrain of the rain garden is gently undulating, with Vivid landscape effects.

When it rains, the rainwater collects on the slope to form rainwater surface runoff, and is blocked by the slope embankment in the rainwater mitigation area.

In the rainwater mitigation area, the clay particles laid on the clay particle layer can adjust the soil moisture while quickly draining rainwater, and at the same time adjust the soil temperature, which is conducive to the attachment and growth of plants and microorganisms, and the gravel layer can effectively prevent soil erosion.

In the rainwater filter tank, rainwater is filtered and purified from top to bottom through the aquifer, the covering layer, the planting soil layer, the artificial filling layer, the sand layer, and the permeable geotextile to the gravel layer. The purified rainwater is collected by the rainwater collection. The seepage holes on the wall of the permeable pipe are collected in the rainwater collection permeable pipe and then transported to the water tank for backup; the rainwater exceeding the design capacity of the rainwater filter tank is overflowed by the rainwater overflow pipe and then transported to the municipal rainwater pipe through the drain pipe for discharge to prevent the occurrence of rainwater filter tank. Severe flooding.

During droughts, the purified rainwater stored in the tank is readily available for watering the rain garden.

The purified rainwater stored in the water tank can also be used for daily use to make reasonable use of rainwater, save the amount of tap water, and be conducive to environmental protection.

The above-mentioned sloping rain garden can collect, purify and store rainwater for backup during rain, drain water in time during heavy rain, prevent soil erosion, and has better ecological and landscape effects.

In the above-mentioned sloping rain garden, the overflow port of the rainwater overflow pipe is 150mm-200mm higher than the covering layer but lower than the foundation pit pit to ensure that the rainwater filter tank has a reasonable water storage capacity (design water storage capacity), and the overflow port is set on the overflow port. There is a filter screen to prevent the mud or rock with larger particles from mixing in the standing water and entering the rain overflow pipe, the drain pipe and blocking or damaging the pipe.

In the above-mentioned sloping rain garden, in the rainwater filter tank, the gravel layer is made of gravel with a particle size of 20mm to 50mm, and the thickness of the gravel layer is 230mm to 270mm; The thickness of the sand layer is 100mm-120mm; the thickness of the artificial filler layer is 300mm-500mm; the thickness of the planting soil layer is 300mm-500m; the covering layer is the bark covering layer, and the thickness of the covering layer is 50mm-80mm. The bark covering layer has good water retention performance, and the nutrients produced by the decay of the bark can be absorbed by water-tolerant plants, which is beneficial to the growth of water-resistant plants.

The above-mentioned sloping rain garden, on the rainwater mitigation area, the gravel layer is made of gravel with a particle size of 30mm to 50mm; the clay particle layer is made of clay particles with a particle size of 30mm to 50mm, and the thickness of the clay particle layer is 100mm～300mm.

Description of drawings

Figure 1 is a sectional view of a sloping rain garden;

Figure 2 is a transverse cross-sectional view of the mitigation zone.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

Referring to a sloping rain garden shown in Figures 1 and 2, it includes a foundation pit 3 recessed on the sloping land 1 and provided with a side slope 2 around the pit opening, and filled in the foundation pit 3 from the original state of the bottom of the foundation pit 3. A rainwater filter pond 12 with a water-accommodating space 11 composed of a gravel layer 5, a permeable geotextile 6, a sand layer 7, an artificial filler layer 8, a planting soil layer 9, and a covering layer 10 that are laid up in sequence from the excavated soil layer 4, the upper surface is The concave planting soil layer 9 in the middle and the covering layer 10 constitute an aquifer 16, and a water tank for collecting purified rainwater and for storing the purified rainwater is buried in the gravel layer 5 (this is the prior art, not shown in the figure). The rainwater collection permeable pipe 13 and the drainage pipe 14 communicated with the municipal rainwater pipe (not shown in the figure) are embedded in the rainwater filter tank 12, and a vertical drainage pipe 14 is embedded in the rainwater filter tank to remove the excess in the rainwater filter tank. The rainwater overflow pipe 15.

The overflow port of the rainwater overflow pipe 15 is 150mm to 200mm higher than the cover layer 10 (in this case, the overflow port of the rainwater overflow pipe 15 is 180mm higher than the cover layer 10) but lower than the pit opening of the foundation pit 3. A filter screen 17 is provided on the orifice.

There are many kinds of fillers that can be used as the covering layer. In this case, bark is used as the filler for the covering layer, and the slope of the upper surface of the covering layer is 8° to 12° (in this case, the slope of the upper surface of the covering layer is 10°), The thickness is 50mm to 80mm (in this case, the thickness of the cover layer is 70mm).

In the rainwater filter tank 12, the gravel layer 5 is made of gravel with a particle size of 20mm to 50mm, and the thickness of the gravel layer 5 is 230mm to 270mm (in this case, the thickness of the gravel layer 5 is 250mm); It is made of washed sand with a particle size of 0.35mm to 0.5mm, and the thickness of the sand layer 7 is 100mm to 120mm (in this case, the thickness of the sand layer 7 is 110mm); the artificial filler layer 8 is composed of volcanic rock and (or) molecular sieve and ( or) diatomite, the thickness of the artificial filler layer 8 is 300mm～500mm (in this case, the thickness of the artificial filler layer 8 is 400mm); the thickness of the planting soil layer 9 is 300mm～500m (in this case, the thickness of the planting soil layer 9 is 300mm～500m) 400mm).

Water-resistant plants 26 are planted in the planting soil layer 9 of the rainwater filter pond 12, and there are many kinds of water-resistant plants 26, including but not limited to Miscanthus, iris, celandine, and lepidopteran.

The rainwater collection permeable pipe 13 includes a permeable pipe body, and a plurality of seepage holes are opened on the wall of the permeable pipe body to communicate with the inside and outside of the permeable pipe body as a channel for driving water from a place with a higher pressure to a place with a lower pressure due to the pressure difference between the inside and outside of the permeable pipe body. , which is the prior art and will not be repeated here.

The above-mentioned sloping rain garden also includes a rainwater alleviation zone 19 that is protruded on the foundation pit water inlet 18 for slowing down the rainwater surface runoff to the speed in the rainwater filter tank 12 through the water inlet 18.

The rainwater mitigation area 19 is a sloping embankment composed of a planting soil layer 20, a clay particle layer 21 and a gravel layer 22 laid up in sequence from the original excavated soil layer 4. , the thickness of the covering layer is 70mm, the slope of the backwater slope 23 of the slope embankment is 40°), and the slope of the slope embankment upstream slope surface 24 to the top of the slope embankment is 51°~54° (in this case, the slope embankment upstream slope surface 24 to 54° The slope of the top of the slope embankment is 53°), and the gradient of the connecting slope surface 25 connecting the water-facing slope surface 24 of the slope embankment and the slope land 1 is 22°-25° (in this case, the connection between the water-facing slope surface 24 of the slope embankment and the slope land 1 is connected. Slope 25 has a slope of 23°).

On the rainwater mitigation zone 19, the gravel layer 22 is made of gravel with a particle size of 30 mm to 50 mm; the clay particle layer 21 is made of clay particles with a particle size of 30 mm to 50 mm, and the thickness of the clay particle layer 21 is 100 mm to 50 mm. 300mm (in this case, the laying thickness of the clay particle layer 21 is 200mm).

Green plants 27 are planted in the planting soil layer 20 of the rainwater mitigation area 19 . Green plants 27 include, but are not limited to, water-tolerant plants and landscape shrubs.

When the above sloping rain garden operates:

The water-resistant plants planted in the planting soil layer of the rainwater filter pond purify the rainwater contained in the foundation pit. The water-resistant plants and the green plants planted in the planting soil layer of the rainwater mitigation area form a ground landscape. The overall terrain of the rain garden is gently undulating, with Vivid landscape effects.

When it rains, the rainwater collects on the slope to form rainwater surface runoff, and is blocked by the slope embankment in the rainwater mitigation area.

In the rainwater mitigation area, the clay particles laid on the clay particle layer can adjust the soil moisture while quickly draining rainwater, and at the same time adjust the soil temperature, which is conducive to the attachment and growth of plants and microorganisms, and the gravel layer can effectively prevent soil erosion.

In the rainwater filter tank, rainwater is filtered and purified from top to bottom through the aquifer, the covering layer, the planting soil layer, the artificial filling layer, the sand layer, and the permeable geotextile to the gravel layer. The purified rainwater is collected by the rainwater collection. The seepage holes on the wall of the permeable pipe are collected in the rainwater collection permeable pipe and then transported to the water tank for backup; the rainwater exceeding the design capacity of the rainwater filter tank is overflowed by the rainwater overflow pipe and then transported to the municipal rainwater pipe through the drain pipe for discharge to prevent the occurrence of rainwater filter tank. Severe flooding.

During droughts, the purified rainwater stored in the tank is readily available for watering the rain garden.

The purified rainwater stored in the water tank can also be used for daily use to make reasonable use of rainwater, save the amount of tap water, and be conducive to environmental protection.

The beneficial effects of the present utility model are:

Compared with the traditional rain garden structure, the utility model has the advantages of effectively treating the rainwater on slopes, high rainwater retention efficiency, reducing surface runoff, reducing soil erosion, better filtering and purifying effect of pollutants in rainwater, and more suitable for vegetation growth. effect, and has the advantages of better landscape effect due to the gently undulating terrain.

When the rainstorm season is encountered, the excess rainwater enters the municipal drainage pipe network through the overflow pipe, which ultimately effectively relieves the urban waterlogging, ensures the urban safety, and maintains the urban ecosystem.

Claims (4)

1. A sloping-field rainwater garden is characterized by comprising a foundation pit which is concavely arranged on a sloping field and is provided with a side slope around a pit opening, a rainwater filtering pool which is filled in the foundation pit and is composed of a gravel layer, a permeable geotextile, a sand layer, an artificial packing layer, a planting soil layer and a covering layer which are sequentially paved upwards from an original excavation soil layer at the bottom of the foundation pit, wherein the planting soil layer and the covering layer which are sunken in the middle of the upper surface form a water storage layer, a rainwater collecting permeable pipe which is communicated with a water tank for storing purified rainwater and a drainage pipe which is communicated with a municipal rainwater pipe are embedded in the gravel layer, a vertical rainwater overflow pipe which is communicated with the drainage pipe is embedded in the rainwater filtering pool, and the gradient of the upper surface of the covering layer is 8-12 degrees; the slope of the water-back slope of the slope is 38-42 degrees, the slope from the water-facing slope of the slope to the top of the slope is 51-54 degrees, and the slope of the connection slope between the water-facing slope of the slope and the sloping field is 22-25 degrees; water-resistant plants are planted in the planting soil layer of the rainwater filtering tank, and green plants are planted in the planting soil layer of the rainwater slowing area.

2. The sloping field rainwater garden of claim 1, wherein the overflow port of the rainwater overflow pipe is 150 mm-200 mm higher than the cover layer but lower than the pit port of the foundation pit, and a filter screen is arranged on the overflow port.

3. A rainwater garden on a sloping field according to claim 1, wherein in the rainwater filtering tank, the gravel layer is formed by laying gravels with the particle size of 20mm to 50mm, and the laying thickness of the gravel layer is 230mm to 270 mm; the sand layer is formed by laying washed sand with the grain diameter of 0.35 mm-0.5 mm, and the thickness of the sand layer is 100 mm-120 mm; the thickness of the artificial filler layer is 300 mm-500 mm; the thickness of the planting soil layer is 300 mm-500 m; the covering layer is a bark covering layer, and the thickness of the covering layer is 50 mm-80 mm.

4. A sloping rainwater garden as claimed in claim 1, wherein in the rainwater slowing zone, the gravel layer is formed by laying gravel with a particle size of 30mm to 50 mm; the pottery clay granule layer is formed by paving pottery clay granules with the grain diameter of 30-50 mm, and the paving thickness of the pottery clay granule layer is 100-300 mm.

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