CN219471147U

CN219471147U - Ecological filter ditch in sponge city

Info

Publication number: CN219471147U
Application number: CN202320726659.XU
Authority: CN
Inventors: 张培龙; 张宇
Original assignee: China Railway First Survey and Design Institute Group Ltd
Current assignee: China Railway First Survey and Design Institute Group Ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2023-08-04
Anticipated expiration: 2033-04-04

Abstract

The utility model discloses a sponge urban ecological filter ditch. The existing motor vehicle is provided with a biological retention belt and other measures at the side of the lane, but the measures do not effectively isolate runoff from surrounding soil. The utility model is arranged between a motor vehicle lane and surrounding soil, and comprises an ecological filter ditch body, wherein openings are arranged on a curb of the motor vehicle lane at equal intervals, and the openings are communicated with the ecological filter ditch body; the ecological filter ditch is internally provided with a lower sand filter layer, a permeable geotextile, an upper sand filter layer, a permeable geotextile and a soil layer from bottom to top in sequence; the end of the ecological filtering ditch body is embedded with a steel sleeve, the steel sleeve is communicated with a drainage inspection well, and the drainage inspection well is communicated with a municipal rainwater pipe network through a rainwater drainage pipe. According to the utility model, the road surface rainwater is effectively isolated from the surrounding soil, so that the probability of polluting the soil by pollutants entrained in the rainwater runoff can be greatly reduced; the drainage inspection well is arranged at the tail end, so that the anti-rainwater runoff impact capability of the ecological filter ditch can be improved.

Description

Ecological filter ditch in sponge city

Technical Field

The utility model belongs to the technical field of sponge city construction water safety and water ecology, and particularly relates to a sponge city ecological filter ditch.

Background

In order to implement the development concept of green and low influence, china greatly promotes the construction of sponge cities, protects and utilizes ecological spaces such as natural mountain bodies, rivers and lakes, greenbelts and the like of the cities, strengthens emission reduction of sources, process control and system management, plays roles of absorbing, slowly releasing and purifying rainwater by building, roads, greenbelts, water systems and the like through measures such as seepage, stagnation, storage, purification, use, drainage and the like, builds an ecological, safe and sustainable urban water circulation system, and builds a blue-green interweaving, lime-green mixing and continuous complete urban ecological infrastructure system.

According to the prior art, in order to realize emission reduction of a rainwater runoff source and runoff pollution control, facilities such as a biological detention belt, a rainwater infiltration ditch or a grass planting ditch are usually arranged on the sides of motor vehicles of municipal roads and building communities, but these measures do not effectively isolate the runoff from surrounding soil, so that a large amount of pollutants (COD, nitrogen, phosphorus, a small amount of heavy metals and the like) in the rainwater runoff of the motor vehicles enter the soil, and soil pollution is caused, so that groundwater is polluted.

Disclosure of Invention

In order to make up the defects of the prior art, the utility model provides the ecological filtering ditch for the sponge city, which is used for effectively isolating pollutants in rainwater from surrounding soil, and residual rainwater filtered at the tail end can be collected into an inspection well and is discharged into a municipal rainwater pipe network nearby through a rainwater pipeline.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a sponge city ecological filter ditch which characterized in that: the ecological ditch is arranged between the motor vehicle lane and the surrounding soil and comprises an ecological ditch body, openings are formed in the curb stone of the motor vehicle lane at equal intervals, and the openings are communicated with the ecological ditch body;

the ecological filter ditch is internally provided with a lower sand filter layer, a permeable geotextile, an upper sand filter layer, a permeable geotextile and a soil layer for planting green plants in sequence from bottom to top;

the tail end of the ecological filtering ditch body is embedded with a steel sleeve, the steel sleeve is communicated with a drainage inspection well, and the drainage inspection well is communicated with a municipal rainwater pipe network through a rainwater drainage pipe;

further, the spacing between the openings on the kerb is 10m;

further, the height of the planted green soil layer is 150mm lower than the pavement of the motor vehicle lane, and a rainwater stagnation aquifer is formed;

further, a round filter screen is arranged at the tail end of the steel sleeve pipe at the inner side of the drainage inspection well;

further, the sand filter layer is a gravel layer with the thickness of 220mm, and the grain diameter is phi 3-phi 5mm;

further, the sand-feeding filter layer is a coarse sand layer with the thickness of 180mm, and the grain diameter is phi 1-phi 2mm;

further, the thickness of the green planting soil layer is 300mm, 20% of fine sand is doped in the soil, and the porosity is 25% -35%;

further, the rainwater drain pipe is a d400 reinforced concrete II-level pipe.

The utility model has the beneficial effects that:

1) According to the utility model, the road surface rainwater is effectively isolated from the surrounding soil, so that the probability of polluting the soil by pollutants entrained in the rainwater runoff can be greatly reduced;

2) The tail end of the utility model is provided with the drainage inspection well, so that the rainwater runoff impact resistance of the ecological filter ditch can be greatly improved;

3) According to the utility model, two layers of sand filter materials are arranged, so that the particle size configuration of the filter materials is optimized, and the rainwater filtering effect can be effectively improved;

4) The water-permeable geotextile is arranged between the packing layers of the ecological filter ditch, so that the mixing disorder of particles with different particle sizes can be effectively prevented;

5) The ecological filter ditch has the advantages of small structure, small occupied area and strong field adaptation capability. The hidden structure is adopted below the ground surface, the exposed ground surface part is mainly plants adapting to ecological filtering ditches of sponge cities, and the landscape effect is good.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a plan view of the present utility model;

FIG. 3 is a structural reinforcement view of the ecological filter ditch body of the utility model;

FIG. 4 is a cross-sectional view of an end-on inspection well of an ecological filter ditch according to the utility model;

FIG. 5 is a sectional view of the end of the ecological filter ditch of the utility model at the position of the inspection well B-B;

in the figure, 1-an ecological filter ditch body; 2-rainwater stagnating aquifer; 3-planting a green plant soil layer; 4-permeable geotextile; 5-sand filtration layer; 6, sand filtering layer; 7-kerbstone; 8-a motor vehicle lane; 9-draining inspection well; 10-a rainwater drain pipe; 11-steel sleeve; 12-round filter screen.

Detailed Description

The present utility model will be described in detail with reference to the following embodiments.

The utility model provides a sponge city ecological filter ditch, which can effectively isolate pollutants in rainwater from surrounding soil, and residual rainwater and excessive rainwater filtered at the tail end can be collected into an inspection well and discharged into a municipal rainwater pipe network nearby through a rainwater pipeline; the ecological filter ditch stagnates and holds the space, realizes the source emission reduction of rainwater runoff, strengthens the elasticity and the toughness of resisting storm disaster, effective pair waterlogging prevention and cure, and the filter material layer and the plant root system of accessible ecological filter ditch realize the purification of rainwater again, utilizes the seepage prevention structure of ditch body simultaneously, realizes the effective isolation of pollutant and peripheral soil in the rainwater.

As shown in fig. 1 and 2, the ecological ditch is arranged between a motor vehicle lane 8 and surrounding soil and comprises an ecological ditch body 1, openings are arranged on a curb 7 of the motor vehicle lane 8 at equal intervals, and the openings are communicated with the ecological ditch body 1; introducing rainwater on the motor way 8 into the ecological filtering ditch; the spacing between the openings on the kerb stone 7 is 10m;

one side of the ecological filtering ditch body 1 is abutted against the curb, and the top surface of the side ditch body is level with the road surface so as to facilitate the rainwater of the motor vehicle lane to be collected. The ditch body adopts a reinforced concrete cast-in-situ structure, the concrete grade is C30 and P6 impervious concrete, the net width of the structure is 500mm, the wall thickness is 150mm, the reinforcement is carried out according to figure 3, and the reinforced bar grade is HRB400.

A lower sand filter layer 6, a permeable geotextile 4, an upper sand filter layer 5, a permeable geotextile 4 and a planting green soil layer 3 are sequentially arranged in the ecological filter ditch body 1 from bottom to top; the height of the planted green soil layer 3 is 150mm lower than the pavement of the motor vehicle lane 8, so that a rainwater stagnation aquifer 2 is formed; the thickness of the green planting soil layer 3 is 300mm, the soil is modified according to 20% fine sand doped in plain soil, and the porosity is 25% -35%.

The sand filter layer 6 is a gravel layer with the thickness of 220mm, and the grain diameter is phi 3-phi 5mm; the sand-feeding filter layer 5 is a coarse sand layer with the thickness of 180mm, and the grain diameter is phi 1-phi 2mm; the permeable geotextile 4 adopts SNG-PET-8-6 short fiber needled non-woven geotextile, and the vertical and horizontal fracture strength is more than or equal to 8KN/m ² 。

As shown in fig. 4 and 5, a steel sleeve 11 with DN100 is pre-embedded at the tail end of the ecological filtering ditch body 1, the steel sleeve 11 is communicated with a drainage inspection well 9, the drainage inspection well 9 is communicated with a municipal rainwater pipe network through a rainwater drainage pipe 10, and the rainwater drainage pipe 10 is a d400 reinforced concrete II-level pipe; the tail end drainage inspection well 9 is of a reinforced concrete structure, the plane size is 1000 multiplied by 1000mm, and the total height is 1.8m so as to accommodate purified rainwater and excessive rainwater; the end of the steel sleeve 11 is provided with a circular filter screen 12 at the inner side of the drainage inspection well 9, the material is stainless steel, the mesh is 10 meshes, the specification is phi 200mm, and the steel sleeve is welded and fixed with a well wall steel bar by using 4 phi 12 lacing wires.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The content of the utility model is not limited to the examples listed, and any equivalent transformation to the technical solution of the utility model that a person skilled in the art can take on by reading the description of the utility model is covered by the claims of the utility model.

Claims

1. The utility model provides a sponge city ecological filter ditch which characterized in that: the ecological ditch is arranged between a motor vehicle lane (8) and peripheral soil and comprises an ecological ditch body (1), wherein openings are formed in a curb (7) of the motor vehicle lane (8) at equal intervals and are communicated with the ecological ditch body (1);

a lower sand filtering layer (6), a permeable geotechnical cloth (4), an upper sand filtering layer (5), a permeable geotechnical cloth (4) and a green planting soil layer (3) are sequentially arranged in the ecological filtering ditch body (1) from bottom to top;

the ecological filter ditch is characterized in that a steel sleeve (11) is embedded at the tail end of the ecological filter ditch body (1), the steel sleeve (11) is communicated with a drainage inspection well (9), and the drainage inspection well (9) is communicated with a municipal rainwater pipe network through a rainwater drain pipe (10).

2. The sponge urban ecological filter ditch according to claim 1, wherein: the spacing between the openings on the curb stone (7) is 10m.

3. A sponge urban ecological filter ditch according to claim 2, wherein: the height of the green planting soil layer (3) is 150mm lower than the pavement of the motor vehicle lane (8), and a rainwater stagnation water storage layer (2) is formed.

4. A sponge urban ecological filter ditch according to claim 3, wherein: the end of the steel sleeve (11) is provided with a circular filter screen (12) at the inner side of the drainage inspection well (9).

5. The sponge urban ecological filter ditch according to claim 4, wherein: the sand filter layer (6) is a gravel layer with the thickness of 220mm, and the grain diameter is phi 3-phi 5mm.

6. The sponge urban ecological filter ditch according to claim 5, wherein: the sand-feeding filter layer (5) is a coarse sand layer with the thickness of 180mm, and the grain diameter is phi 1-phi 2mm.

7. The sponge urban ecological filter ditch according to claim 6, wherein: the rainwater drain pipe (10) is a d400 reinforced concrete II-level pipe.