CN210002537U - A lateral slope grass planting ditch for sponge city - Google Patents

Abstract

The utility model relates to the field of sponge city construction, in particular to a lateral slope type grass planting ditch for sponge city. Aquifer layer, organic cover layer, improved soil layer, medium-coarse sand transition layer, permeable geotextile, gravel layer, anti-seepage composite geomembrane and plain soil, the gravel layer is connected with a horizontal drainage pipe, and the drainage pipe is connected to the municipal rainwater well, The concave point of the lateral slope grass-planting ditch is located at 1/5 of the concave green space near the side of the motor vehicle lane, and the bottom of the aquifer is concave to form an arc. Compared with the existing grass-planting ditch, the utility model is characterized in that the grass-planting ditch structure is made into a lateral slope type, so as to solve the problem of low survival rate of vegetation and ecological tree ponds caused by long-term water soaking in the concave green space, and ensure the survival of vegetation. rate, making the sponge city more capable of absorbing, storing, infiltrating and purifying water.

Description

A lateral slope grass planting ditch for sponge city

technical field

The utility model belongs to the field of sponge city construction, and relates to a lateral slope type grass planting ditch used in sponge cities.

Background technique

my country's urbanization development intensity is high, and there are many hardened pavements, which destroy the original ecosystem, especially the opening of mountains, water cover, deforestation, land occupation, and lake filling, which have changed the original natural ecological background and hydrological characteristics of cities. 70 More than % of the rainfall is discharged as runoff, which makes the city unable to store water, and the phenomenon of "heavy rain will lead to waterlogging, and drought after rain" occurs. Due to the backward construction of urban underground drainage system, the problem of waterlogging after heavy rainfall has brought many problems and problems. Economic losses.

In response to the above problems, the concept of "sponge city" was proposed. Sponge city can give full play to the natural purification effect of vegetation, soil, wetland, etc. on water quality, so that the city can absorb and release rainwater like a "sponge", and can adapt flexibly. Environmental change and responding to natural disasters. Grass-planting ditch is an important part of sponge city. It has a good effect on purifying and saving rainwater runoff. However, when the rainfall is too large, it is easy to generate stagnant water, which makes the green space vegetation soak in water in a large area, and the nutrient of ordinary planting soil is insufficient. Therefore, it is necessary to improve the traditional grass-planting ditch to ensure the survival of the vegetation on the surface of the grass-planting ditch, so as to better exert the ability of the grass-planting ditch to absorb, seep, purify and store water.

Utility model content

The technical problem to be solved by the utility model is that, aiming at the shortcomings of the existing traditional grass-planting ditch, a lateral slope type grass-planting ditch for sponge city is proposed.

To achieve the above object, the technical scheme of the present utility model is:

A lateral slope type grass-planting ditch for sponge city, comprising a ditch body, the ditch body is, from top to bottom, an aquifer, an organic covering layer, an improved soil layer, a medium-coarse sand transition layer, a permeable geotextile, Gravel layer, anti-seepage composite geomembrane and plain soil, the gravel layer is connected with a horizontal drainage pipe, and the drainage pipe is connected to the municipal rainwater well; the organic covering layer is made of bark, with a thickness of 3-5 cm; the improved soil layer is composed of 75 % planting soil, 20% coconut bran and 5% humus are mixed; a permeable geotextile is arranged between the medium-coarse sand transition layer and the gravel layer; an anti-seepage composite geomembrane is arranged between the gravel layer and the plain soil; The groove concave point of the lateral slope grass-planting ditch is located at 1/5 of the concave green space near the side of the motor vehicle lane, and the bottom of the aquifer is concave to form an arc.

The utility model is further provided with an organic covering layer, and the organic covering layer adopts bark and has a thickness of 3-5 cm.

The utility model is further provided with an improved soil layer, and the improved soil layer is composed of 75% of planting soil, 20% of coconut bran and 5% of humus soil, and the thickness is 60-80cm.

The utility model is further provided with a permeable geotextile and an anti-seepage composite geomembrane. The permeable geotextile is arranged between the medium-coarse sand transition layer and the gravel layer; the anti-seepage composite geomembrane is arranged between the gravel layer and the plain soil.

The utility model further sets the groove concave point at 1/5 of the concave green space close to the side of the motor vehicle lane.

Description of drawings

1 is a schematic diagram of a lateral slope type grass-planting ditch used in a sponge city according to an embodiment of the present utility model;

The reference numerals for each element in the figure are explained as follows:

1- Aquifer; 2- Organic cover; 3- Improved soil layer; 4- Medium-coarse sand filter layer; 5- Permeable geotextile; 6- Gravel drainage layer; 7- Anti-seepage composite geomembrane; 8- Drainage pipe ; 9- groove pit; 10- motor vehicle lane; 11- sidewalk

Detailed ways

In order to better understand the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The described embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit the present utility model.

A lateral slope type grass-planting ditch for sponge city, as shown in Figure 1, the lateral slope type grass-planting ditch is arranged between the concave green space between the motor vehicle lane 10 and the sidewalk 11, and the groove concave point 9 is located at the bottom. The concave green space is close to 1/5 of the motor vehicle lane 10, and water-resistant herbs and woody plants are planted on the grass-planting ditch, which plays the role of water storage and landscape. From top to bottom, the ditch is composed of aquifer 1, organic covering layer 2, improved soil layer 3, medium-coarse sand transition layer 4, permeable geotextile 5, gravel layer 6, anti-seepage composite geomembrane 7 and plain soil.

In the specific embodiment of the present invention, the runoff rainwater of the motor vehicle lane 10 and the sidewalk 11 flows to the grass-planting ditch through the opening of the curb, and the groove of the grass-planting ditch stores a small amount of rainwater, and the excess rainwater gradually seeps down through the aquifer 1 and flows through Organic covering layer 2, improved soil layer 3, medium-coarse sand transition layer 4, permeable geotextile 5, gravel layer 6, after the rainwater stays in the grass-planting ditch for a period of time, it is finally discharged to the municipal rainwater well through the drainage pipe 8.

The organic covering layer 2 is made of bark, with a thickness of 3-5 cm. The organic covering layer can be used to filter rainwater initially, so that the large particles of pollutants do not directly infiltrate into the improved soil layer. On the other hand, the organic covering layer can continuously provide organic nutrients for the lower improved soil layer, which is conducive to the survival of vegetation; the thickness of the improved soil layer 3 is 60-80cm, and the improved soil layer is composed of 75% planting soil, 20% coconut bran and 5% The humus is mixed, and the improved soil layer 3 is slightly compacted manually after laying; the medium-coarse sand transition layer 4 plays a filtering role, and the thickness is 10-15cm; Geotextile 5 can further filter and purify rainwater, and at the same time can prolong the residence time of rainwater in the grass-planting ditch. The general weight of geotextile is ≥300g/m ² , the thickness is ≥0.25mm, and the tear strength is ≥400N; the thickness of the gravel layer 6 The diameter is 30cm, and a transverse drainage pipe 8 is arranged in the gravel layer 6, and the drainage pipe is connected to the municipal rainwater well; an anti-seepage composite geomembrane 7 is arranged between the gravel layer 6 and the plain soil, which can be in the form of two cloths and one membrane, and the specifications are generally weight ≥300g/m ² , thickness ≥0.25mm, tear strength ≥8KN/m, and the anti-seepage composite geomembrane is wrapped at the interface between green space, motor vehicle lane 10 and sidewalk 11 for reverse filtration.

To sum up, the utility model optimizes the structure and material of the traditional grass-planting ditch, which can ensure the survival of vegetation above the grass-planting ditch, and has good water absorption, water seepage, water purification and water storage capabilities.

Claims (2)

1. lateral slope type grass planting ditches for sponge cities are characterized in that the lateral slope type grass planting ditches sequentially comprise a water storage layer, an organic covering layer, an improved soil layer, a medium coarse sand transition layer, a gravel layer and plain soil from top to bottom, a permeable geotextile is arranged between the medium coarse sand transition layer and the gravel layer, an impermeable composite geomembrane is arranged between the gravel layer and the plain soil, the gravel layer is connected with a transverse drain pipe, the drain pipe is connected to a municipal rainwater well, a groove concave point is located at 1/5 position of a concave green land close to the side of a motor vehicle road, and the bottom of the water storage layer is concave to form an arc shape.
2. 2. The side slope type grass planting ditch for sponge city as claimed in claim 1, wherein the organic covering layer is bark 3-5 cm thick and the improved soil layer is 60-80 cm thick.

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