WO2022217749A1

WO2022217749A1 - Rainwater filtering garden

Info

Publication number: WO2022217749A1
Application number: PCT/CN2021/102997
Authority: WO
Inventors: 李茂林; 赵昕; 薛晓宁; 李建业; 申静; 霍新霖; 王岩
Original assignee: 中国建筑设计研究院有限公司
Priority date: 2021-04-13
Filing date: 2021-06-29
Publication date: 2022-10-20
Also published as: CN215223342U; AU2021105271A4

Abstract

A rainwater filtering garden, comprising: a pit groove formed by excavation of an original soil layer (1), a water storage layer (2), a water permeable layer (3), and a planting soil layer (4) being laid in the pit groove from bottom to top, and a concave planting space being defined by the top surface of the planting soil layer (4); a rainwater storage pipe (8), a water inlet thereof being located outside the concave planting space for rainwater collection, and a water outlet of the rainwater storage pipe being located inside or along the edge of the concave planting space and used for guiding rainwater into the concave planting space; an overflow pipe (7), perpendicularly penetrating through the water permeable layer (3) and the planting soil layer (4), a first end opening of the overflow pipe being located in the concave planting space, and a second end opening being located in the water storage layer (2); and a perforated pipe (11), laid inside the water storage layer (2) and connected to a ground water consuming site by means of a drain pipe (12). The rainwater filtered by the rainwater filtering garden is uniformly discharged by means of the perforated pipe for use by the water consuming site, and the rainwater resource is fully utilized.

Description

A rainwater filter garden

technical field

This patent belongs to the technical field of rain gardens, and specifically relates to a rainwater filtration garden.

Background technique

Since the release of the "Technical Guide for Sponge City Construction", a boom in sponge city construction has been launched in China. The ultimate goal of sponge city construction is rainwater management, and its comprehensive control goals include total rainwater control, rainwater resource utilization, rainwater pollution control and peak reduction, and the realization of the goal depends on the implementation of low-impact development technologies.

Rain gardens are common ecological facilities in sponge cities, which are generated by combining additional bioretention functions and landscape leisure and viewing functions on the basis of the form of sunken green spaces. Through the vegetation on the surface of the rain garden, the planting matrix and the microorganisms in the grassroots, the regulation, storage, infiltration and purification can be achieved, so as to provide effective purification treatment of rainwater, and rely on the space provided by the concave surface and the pores of the underground gravel layer to regulate and store rainwater. .

In a common rain garden, the ground rainwater runoff is filtered by the upper vegetation to remove impurities such as leaves, branches, and gravel particles mixed in the rainwater, and then the next step is filtered by infiltration layer by layer, and the filtered rainwater directly seeps into the ground. Although the rain garden conforms to the concept of sponge city, due to its simple structure, the filtration effect is poor after a period of operation, which not only reduces the filtration and purification function of rainwater, but also is difficult to maintain in the later stage. Into the municipal rainwater pipeline, the rainwater resources are not fully utilized, which is not in line with the concept of sponge city construction.

Utility model content

In view of the above analysis, the present utility model aims to provide a rainwater filter garden to solve the problem that the existing rainwater garden has poor filtering effect after running for a period of time, and the filtered rainwater is directly discharged into the rainwater pipe network, and the rainwater resources are not fully utilized. .

The purpose of this utility model is achieved in this way:

A rainwater filtration garden comprising:

The pit is formed by excavation in the original soil layer. The water storage layer, permeable layer and planting soil layer are laid from bottom to top in the pit, and the top surface of the planting soil layer forms a concave planting space;

Rainwater storage pipe, the water inlet of the rainwater storage pipe is located outside the concave planting space for rainwater to sink in, and the outlet of the rainwater storage pipe is located inside or outside the concave planting space, used to guide rainwater into the concave planting space;

overflow pipe, the overflow pipe vertically penetrates the permeable layer and the planting soil layer, the opening of the first end of the overflow pipe is located in the concave planting space, and the opening of the second end of the overflow pipe is located in the water storage layer;

The perforated pipe is laid inside the water storage layer, and the perforated pipe is connected to the ground water point through the drainage pipe.

Further, the overflow pipe is in direct communication with the perforated pipe.

Further, the top surface of the planting soil layer has a planting plane and a side slope, the planting plane and the side slope are transitionally connected, and the slope of the side slope is 3:1; the distance from the first end opening above the planting plane is 150-230mm.

Further, the perforated pipe is arranged horizontally and is located 10-50mm above the bottom surface of the water storage layer.

Further, the number of perforated pipes is at least two, which are evenly distributed in the water storage layer.

Further, at least one of the overflow pipe, the perforated pipe, and the drain pipe is a PVC pipe.

Further, the water storage layer is stacked with gravel of a first particle size, and the permeable layer is stacked with gravel of a second particle size, and the first particle size is larger than the second particle size.

Further, the first particle size is 20-40mm, the second particle size is 10-20mm; the thickness of the water storage layer is 300mm, the thickness of the permeable layer is 80mm, and the thickness of the planting soil layer is 150-300mm.

Further, both the water storage layer and the permeable layer are wrapped with permeable geotextiles.

Further, the perforated pipe is wrapped with a permeable geotextile; the bottom wall and the side wall of the pit are covered with an anti-seepage geotextile.

Further, the first end opening of the overflow pipe is provided with an anti-backflow component.

Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

(1) The rainwater is filtered and purified through the plant root system, the mulch layer and the multi-level permeable layer. The filtering effect is good and the water quality is guaranteed. The filtered rainwater is stored in the water storage layer, and the perforated pipe laid in the water storage layer, Unified drainage for use at water points, making full use of rainwater resources.

(2) Anti-seepage geotextiles are laid on the bottom wall and side walls of the pit to prevent rainwater from seeping out and improve the collection efficiency of rainwater.

(3) The perforated pipe is wrapped with a permeable geotextile, which can effectively prevent soil particles from clogging the holes and ensure its working reliability.

(4) Use geotextile to wrap the permeable layer and water storage layer into a square structure, which is convenient for construction, and can also prevent soil from infiltrating into the gap between the gravel of the permeable layer and the water storage layer, affecting the porosity and permeability of the gravel layer. It can also ensure the stability of the garden stratum structure.

(5) The opening of the first end of the overflow pipe is provided with a ventilation cap, and the ventilation cap has the function of filtering impurities, which can prevent impurities from entering the overflow pipe and cause blockage, and solve the problem of clogging of the overflow pipe.

(6) The structure is simple, the construction is convenient, and the cost is low. Through the refined structure, the water quality treatment effect is good, and it can also be used for rural decentralized small sewage treatment, which has a wide application prospect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following briefly introduces the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some of the embodiments described in the embodiments of the present specification. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

1 is a schematic cross-sectional view of a rainwater filtration garden of the present invention;

FIG. 2 is a top view of the rainwater filtration garden of the present invention.

Reference number:

1- original soil layer; 2- water storage layer; 3- permeable layer; 4- planting soil layer; 5- anti-seepage geotextile; 6- mulch layer; 7- overflow pipe; 8- rainwater storage pipe; 9 - Energy dissipation mechanism; 10- Plant; 11- Perforated pipe; 12- Drain pipe.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

In order to facilitate the understanding of the embodiments of the present application, further explanations will be given below with specific embodiments in conjunction with the accompanying drawings, and the embodiments do not constitute limitations to the embodiments of the present application.

A specific embodiment of the present utility model, as shown in Figures 1-2, discloses a rainwater filtration garden, including:

The pits are excavated in the original soil layer 1. In the pits, water storage layers 2, permeable layers 3 and planting soil layers 4 are laid sequentially from bottom to top. The water permeability of planting soil layers 4, permeable layers 3 and water storage layers 2 Strengthen in turn, and the top surface of the planting soil layer 4 forms a concave planting space;

The rainwater storage pipe 8 is used to introduce rainwater into the concave planting space. The water inlet of the rainwater storage pipe 8 is located outside the concave planting space for rainwater to sink in; the water outlet of the rainwater storage pipe 8 is located in the concave planting space. The inner or outer edge, for directing rainwater into the concave planting space;

The overflow pipe 7 is arranged through the permeable layer 3 and the planting soil layer 4. The overflow pipe 7 is arranged perpendicular to the horizontal plane. The two ends of the overflow pipe 7 respectively have a first end opening and a second end opening. In the concave planting space, the second end opening is located in the water storage layer 2 .

The perforated pipe 11 is laid inside the water storage layer 2, and the perforated pipe 11 is connected with a drain pipe 12, and the drain pipe 12 is connected with the ground water point.

In this embodiment, the top surface of the planting soil layer 4 has a planting plane and a side slope, the planting plane and the side slope are connected in transition, and the slope of the side slope is 3:1, which can quickly and advantageously reach the required depth, and solves the problem of under the rain garden. Concave security issues.

In this embodiment, the pipe overflow pipe 7 is used as a rainwater collection pipe, the first end opening of the overflow pipe 7 is 150-230mm higher than the planting soil layer 4, and the first end opening is used as an overflow port, and a small amount of rainwater directly falls into The first end of the overflow pipe 7 is opened and enters the water storage layer; as the rainfall progresses, the water level continues to rise. When the rainwater is higher than the opening of the first end, the rainwater enters the water storage layer through the overflow pipe 7 to realize overflow Function.

Considering that when the rainwater is poured back, the rainwater entering the water storage layer 2 through the overflow pipe 7 will pollute the filtered rainwater in the water storage layer 2. The overflow pipe 7 is directly connected with the perforated pipe 11, because the overflow pipe 7 is connected to the perforated pipe. 11 is directly connected. Once the water level in the concave planting space exceeds the opening of the first end of the overflow pipe 7, the rainwater will be directly discharged through the perforated pipe when the rainwater is poured back, so as to minimize the unfiltered rainwater entering the water storage layer and reduce the impact on storage. pollution of the water layer.

Considering the infiltration of rainwater and lateral seepage, an optional implementation in this embodiment is to lay anti-seepage geotextiles 5 on the bottom wall and sidewall of the pit, and prevent rainwater from seeping out by laying anti-seepage geotextiles Rainwater collection efficiency.

In order to prevent the holes of the perforated pipe 11 from being blocked, the perforated pipe 11 is wrapped with a permeable geotextile, which can effectively prevent soil particles from blocking the holes and ensure its working reliability.

Further, the perforated pipes 11 are arranged horizontally, and the perforated pipes 11 are located 10-50 mm above the bottom surface of the water storage layer 2; the number of perforated pipes 11 is at least two, which are evenly distributed in the water storage layer 2, and the perforated pipes 11 are provided with at least one outlet. The water outlet and the water outlet are connected with a drainage pipe 12 , and the drainage capacity can be improved by arranging a plurality of perforated pipes 11 .

In this embodiment, the water storage layer 2 is stacked with gravel of a first particle size, and the permeable layer 3 is stacked with gravel of a second particle size, and the first particle size is larger than the second particle size.

Further, the number of permeable layers 3 is multi-layered, and from top to bottom, the permeability of the permeable layer increases sequentially, the particle size of the gravel gradually increases, and the thickness of the permeable layer increases sequentially.

Further, the first particle size is 20-40mm, and the second particle size is 10-20mm; the thickness of the water storage layer 2 is 300mm, the thickness of the permeable layer 3 is 80mm, and the thickness of the planting soil layer 4 is the planting plane to the permeable layer. The top surface distance of layer 3 is 150-300mm.

In a preferred implementation of this embodiment, the water storage layer 2 and the permeable layer 3 are both wrapped with permeable geotextiles. During construction, the gravel is screened according to the range of the first particle size and the second particle size, and the first particle size gravel is wrapped into the water storage layer 2 and the second particle size gravel is wrapped into the water permeable layer 3 by using permeable geotextiles. , The use of permeable geotextiles to wrap the gravel is convenient for the gravel to maintain a stable shape and easy to lay, and the use of permeable geotextiles can filter small particles of soil particles to prevent soil from filling in the gaps of the permeable layer 3 and the water storage layer 2, ensuring that Penetration and effluent functions.

In this embodiment, a mulch layer 6 is laid on the top surface of the planting soil layer 4, which helps to avoid the loss of surface soil.

Optionally, the opening of the first end of the overflow pipe 7 is provided with a ventilation cap, and the ventilation cap has the function of filtering impurities to prevent floating impurities from entering the overflow pipe 7 to cause blockage, and to ensure the reliability of the overflow.

Optionally, the first end opening of the overflow pipe 7 is provided with an anti-backflow component, and the anti-backflow component adopts the form of a floating casing. The inner wall is in sealing contact with the outer wall of the overflow pipe 7, the extension pipe can partially overlap with the overflow pipe 7, and annular foam is arranged outside the extension pipe, the inner diameter of the annular foam is equal to the outer diameter of the extension pipe, and the outer diameter of the annular foam is equal to 2-3 Double the outer diameter of the extension pipe, and the length of the overlapping portion of the extension pipe and the overflow pipe 7 ranges from 50mm to 100mm. When the rainwater is too large, the extension pipe will float under the buoyancy of the annular foam, and the annular foam will drive the extension pipe to move upward, which can appropriately increase the height of the water inlet of the overflow pipe 7, and the maximum lifting height is about 100mm, so that to a certain extent Prevent rainwater from pouring into the overflow pipe 7. When the water level is too high and exceeds the maximum overflow water level of the overflow pipe 7, the rainwater enters the water storage layer through the opening of the first end to realize the overflow drainage function; when the water level drops, the extension pipe down until reset. By setting the anti-backflow component, the height of the overflow pipe 7 exposed to the ground can be reduced, which is more beautiful, and reduces the defect that the overflow pipe is easily bent and damaged due to the excessive length of the overflow pipe.

In this embodiment, the water outlet of the rainwater storage pipe 8 is located at the top of the side slope, and the energy dissipation mechanism 9 is laid within the falling water range of the water outlet to prevent scouring. Optionally, the energy dissipating mechanism 9 is stacked with gravel, the source of the gravel is wide, the cost is low, and the garden slope can be made more beautiful by piling and arranging the gravel in a pattern.

Further, at least one of the overflow pipe 7, the perforated pipe 11 and the drain pipe 12 is a PVC pipe. PVC pipe has excellent tensile strength, compressive strength and corrosion resistance, and has a wide range of sources and low cost.

When rainfall occurs, the rainwater directly falls into the concave planting space, or enters the concave planting space through the rainwater storage pipe 8, and the rainwater flowing out from the rainwater storage pipe 8 passes through the pebbles to dissipate energy, and then flows around or infiltrates downward to plant plants. The planting soil layer of 10 absorbs a certain amount of water, and the rainwater seeps down after its own moisture content is saturated. Through the permeable geotextile, the rainwater is purified by the filtering and interception of the intermediate gravel permeable layer 3 and the gravel of the water storage layer 2. With the infiltration of rainwater, when the water level of the rainwater in the water storage layer is higher than the perforated pipe 11, the rainwater is collected in the perforated pipe 11 through the holes, and finally discharged to the water point through the drain pipe 12 for reuse. When the rainfall is large and exceeds the infiltration capacity of the rain garden, the rainwater accumulates on the surface of the concave planting space, and when the water level in the concave planting space is higher than the opening of the first end of the overflow pipe 7, the rainwater enters the overflow pipe, The rainwater is directly discharged through the perforated pipe 11 to minimize the unfiltered rainwater entering the water storage layer, thereby reducing the pollution to the water storage layer.

Compared with the prior art, the rainwater filtration garden provided by this embodiment has at least the following beneficial effects:

(5) The opening of the first end of the overflow pipe is provided with a ventilation cap, and the ventilation cap has the function of filtering impurities, which can prevent impurities from entering the overflow pipe and cause blockage, and solves the problem of clogging of the overflow pipe.

(6) The water outlet of the rainwater storage pipe is located at the top of the slope, and the energy dissipation mechanism is laid within the falling water range of the water outlet. The energy dissipation mechanism is piled with gravel, which can not only prevent scour, but also arrange the gravel by pattern stacking. , can make the garden slope more beautiful.

(7) The 3:1 slope can quickly and advantageously reach the required depth, and solve the problem of the safety of the rain garden sinking.

(8) The structure is simple, the construction is convenient, and the cost is low. Through the refined structure, the water quality treatment effect is good, and it can also be used for rural decentralized small sewage treatment, which has a wide application prospect.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above descriptions are only specific embodiments of the present application, and are not intended to limit the Within the scope of protection, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A rainwater filtration garden, characterized in that it includes:

The pit is formed by excavation in the original soil layer (1). The water storage layer (2), the permeable layer (3) and the planting soil layer (4) are laid from bottom to top in the pit, and the top surface of the planting soil layer (4) is surrounded by Concave planting space;

Rainwater storage pipe (8), the water inlet of the rainwater storage pipe (8) is located outside the concave planting space for rainwater to sink in, and the water outlet of the rainwater storage pipe (8) is located inside the concave planting space or The outer edge is used to direct rainwater into the concave planting space;

an overflow pipe (7), the overflow pipe (7) vertically penetrates the permeable layer (3) and the planting soil layer (4), and the first end opening of the overflow pipe (7) is located in the concave planting space , the opening of the second end of the overflow pipe (7) is located in the water storage layer (2);

The perforated pipe (11) is laid inside the water storage layer (2), and the perforated pipe (11) is connected to the ground water point through the drainage pipe (12).
The rainwater filtration garden according to claim 1, wherein the overflow pipe (7) is in direct communication with the perforated pipe (11).
The rainwater filtration garden according to claim 1, wherein the top surface of the planting soil layer (4) has a planting plane and a side slope, the planting plane and the side slope are transitionally connected, and the slope of the side slope is 3:1;

The distance of the first end opening above the planting plane is 150-230 mm.
The rainwater filtration garden according to claim 3, wherein the perforated pipe (11) is arranged horizontally and is located 10-50mm above the bottom surface of the water storage layer (2).
The rainwater filtration garden according to claim 4, characterized in that, the number of the perforated pipes (11) is at least two, which are evenly distributed in the water storage layer (2).
The rainwater filtration garden according to claim 5, characterized in that, at least one of the overflow pipe (7), the perforated pipe (11), and the drain pipe (12) is a PVC pipe.
The rainwater filtration garden according to any one of claims 1 to 6, characterized in that, the water storage layer (2) is stacked with gravel of a first particle size, and the permeable layer (3) is made of a second particle size of gravel. For gravel stacking, the first particle size is larger than the second particle size.
The rainwater filtration garden according to claim 7, wherein the first particle size is 20-40mm, and the second particle size is 10-20mm;

The thickness of the water storage layer (2) is 300 mm, the thickness of the water permeable layer (3) is 80 mm, and the thickness of the planting soil layer (4) is 150-300 mm.
The rainwater filtration garden according to claim 8, wherein the water storage layer (2) and the permeable layer (3) are both wrapped with permeable geotextiles.
The rainwater filtration garden according to claim 1, characterized in that, the perforated pipe (11) is wrapped with a permeable geotextile.