A subsurface flow ecological open ditch unit and subsurface flow ecological open ditch

Abstract

This application discloses a subsurface flow ecological open ditch unit and a subsurface flow ecological open ditch. The subsurface flow ecological open ditch unit includes: ditch sills (1), which are multiple in number and are sunkenly installed at the bottom of the subsurface flow ecological open ditch unit, spaced apart at the bottom of the subsurface flow ecological open ditch unit; and a retaining structure (2) installed along the extension direction of the ecological open ditch. The subsurface flow ecological open ditch unit proposed in this application, by setting multiple ditch sills, forms a local low-lying area at the bottom of the ecological open ditch, which slows down the water flow and facilitates the deposition of silt and suspended solids in rainwater runoff, thereby improving the drainage water quality of the subsurface flow ecological open ditch and reducing the impact of suspended pollutants on the surrounding environment. In addition, the low-lying area formed by the ditch sills can play a certain role in water storage and drainage, delaying the peak flow velocity, so that the ecological open ditch meets the requirements of sponge city.

Description

Technical Field

[0001] This application relates to the field of municipal engineering, and more specifically, to a subsurface flow ecological open ditch unit and a subsurface flow ecological open ditch. Background Technology

[0002] Open drainage ditches, as a crucial infrastructure for urban stormwater management, are primarily used to collect and discharge surface runoff. Traditional open drainage ditches typically have an open structure, with rainwater flowing into the ditch after passing through the surface before being discharged into the urban drainage system. Municipal roads, railway stations, parks, and plazas have vast paved areas, especially municipal roads where paved surfaces accumulate significant amounts of rubber residue from vehicle tire friction; railway stations and parks also harbor considerable amounts of oil stains and debris. These substances are washed away by initial rainfall runoff, forming suspended pollutants that flow into hardened drainage ditches and ultimately into rivers, lakes, and seas, polluting the surrounding environment.

[0003] Higher requirements have been placed on open drainage ditches, which not only need to have drainage capacity, but also functions such as interception of sewage, sedimentation, and initial rainwater purification.

[0004] Therefore, how to provide an ecological open ditch that can purify rainwater in its initial stage and avoid polluting the surrounding environment has become a technical problem that needs to be solved in this field. Utility Model Content

[0005] In view of this, this application proposes a subsurface flow ecological open ditch unit and a subsurface flow ecological open ditch.

[0006] According to the first aspect of this application, a subsurface flow ecological open ditch unit is proposed, the subsurface flow ecological open ditch unit comprising: a plurality of ditch embankments, which are sunkenly disposed at the bottom of the subsurface flow ecological open ditch unit and spaced apart at the bottom of the subsurface flow ecological open ditch unit; and a retaining structure disposed perpendicular to the extension direction of the subsurface flow ecological open ditch; and a retaining structure disposed along the extension direction of the ecological open ditch.

[0007] Preferably, the spacing between the ditches is 1m to 2m, and the depth of the ditches is 10cm to 20cm.

[0008] Preferably, the cross-section of the ditch embankment in the radial direction of the ecological open ditch is one of a rectangle, a triangle, or a circular arc.

[0009] Preferably, the bottom of the ditch is provided with pores to replenish groundwater.

[0010] Preferably, the diameter of the pores in the trench is 0-5 mm; the pore density is 100 pores / m³. 2 ~200 pieces / m 2 .

[0011] Preferably, the enclosure structure is arranged perpendicularly to or inclined to the bottom surface of the ditch.

[0012] Preferably, the length of the subsurface flow ecological open ditch unit is 2m to 4m, and the material is a polymer, including at least one of polyethylene, polypropylene or polyvinyl chloride.

[0013] According to a second aspect of this application, a subsurface flow ecological open ditch is proposed, which is formed by combining the aforementioned subsurface flow ecological open ditch units.

[0014] Preferably, the subsurface flow ecological open ditch further includes a micro-regulating tank, which is set in the ditch embankment.

[0015] Preferably, the micro-regulating tank comprises, from bottom to top: a gravel layer, which is graded on the bottom surface of the ditch; a sediment layer, which is formed by the deposition of suspended pollutants and silt in the sewage; and a vegetation layer, which is formed naturally and / or by artificial sowing of grass seeds.

[0016] The subsurface flow ecological open ditch unit proposed in this application forms a local low-lying area at the bottom of the ecological open ditch by setting up multiple ditches and embankments. This slows down the water flow and facilitates the deposition of silt and suspended solids in the rainwater runoff, thereby improving the drainage quality of the subsurface flow ecological open ditch and reducing the impact of suspended pollutants on the surrounding environment. In addition, the low-lying area formed by the ditches and embankments can play a certain role in water storage and drainage, delaying the flow rate of flood peaks, so that the ecological open ditch meets the requirements of sponge city.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application, and the illustrative embodiments and descriptions thereof are used to explain this application. In the drawings:

[0019] Figure 1 This is an axial side view of a subsurface ecological open ditch unit according to a preferred embodiment of this application.

[0020] Figure 2 This is a cross-sectional schematic diagram of the ditch sill of the subsurface ecological open ditch unit AA according to a preferred embodiment of this application.

[0021] Figure 3 This is a schematic cross-sectional view of the non-ditch section of the subsurface ecological open ditch unit BB according to a preferred embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the installation location of the subsurface flow ecological open ditch unit according to a preferred embodiment of this application.

[0023] Figure 5 This is a partially enlarged schematic diagram of a micro-regulating reservoir for a spring-fed ecological open ditch according to a preferred embodiment of this application. Detailed Implementation

[0024] The technical solution of this application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] According to the first aspect of this application, a subsurface flow ecological open ditch unit is proposed, such as... Figure 1 As shown, the subsurface flow ecological open ditch unit includes: a ditch sill 1, which is a plurality of ditch sills, which are sunken and set at the bottom of the subsurface flow ecological open ditch unit and are spaced apart at the bottom of the subsurface flow ecological open ditch unit; and a retaining structure 2, which is set along the extension direction of the ecological open ditch.

[0026] The subsurface flow ecological open ditch unit proposed in this application can be applied to municipal engineering projects such as municipal roads, railway stations, parks, and squares. In this application, its application in parks and squares is taken as an example.

[0027] like Figures 2-4 As shown, the height of the above-mentioned enclosure structure 2 is the same as the depth of a conventional open ditch, generally 0.5m-1.5m high, but can also be set according to actual needs.

[0028] The sunken design of the aforementioned ditch 1 allows sediment in the initial rainwater runoff to settle at the bottom of the ditch 1. Furthermore, the design of the ditch 1 slows down the rainwater flow, causing suspended pollutants to settle within it. Multiple ditch 1s are spaced at the bottom of the ecological open ditch unit, flowing sequentially through each ditch 1 in the direction of water flow. The ditch 1 functions similarly to a horizontal flow sedimentation tank; for slow-flowing water, suspended pollutants can fall vertically at a fixed rate and be intercepted by the ditch 1.

[0029] The subsurface flow ecological open ditch unit proposed in this application forms a local low-lying area at the bottom of the ecological open ditch by setting multiple ditch sills 1. This slows down the water flow and facilitates the deposition of silt and suspended solids in rainwater runoff, reducing pollution of the surrounding environment by silt and suspended solids and improving the effluent quality of the ecological open ditch. In addition, the low-lying area formed by the ditch sills 1 can play a certain role in water storage and drainage, delaying the peak flow velocity, so that the ecological open ditch meets the requirements of a sponge city.

[0030] like Figure 1 and Figure 4As shown, to ensure that silt and suspended pollutants in rainwater can be effectively intercepted by the ditch sill 1, thereby reducing the possibility of polluting the surrounding environment, preferably, the spacing between the ditch sills 1 is 1m to 2m, and the depth of the ditch sill 1 is 10cm to 20cm. The spacing and depth of the ditch sills 1 can be set according to actual needs. In ecological open ditch units applied to municipal engineering projects, the spacing between the ditch sills 1 is 1m and the depth is 20cm. The placement of ditch sills 1 at certain intervals in the aforementioned subsurface flow ecological open ditch units helps to intercept and settle silt, suspended solids, and other pollutants in sections, preventing overloading or blockage of local ditch sills 1, and improving the overall treatment efficiency and stability of the drainage system. Simultaneously, it facilitates segmented maintenance and management, reduces the frequency of dredging, and effectively reduces non-point source pollution, ensuring the safety of downstream water quality.

[0031] The aforementioned ditch embankment 1 can be in a suitable form to effectively intercept silt and suspended pollutants in rainwater. Preferably, the cross-section of the ditch embankment 1 in the radial direction of the ecological open ditch is one of a rectangle, a triangle, or a circular arc. In this application, a rectangle is used as an example.

[0032] According to a preferred embodiment of this application, the bottom of the ditch sill 1 is provided with pores for allowing water retained in the ditch sill 1 to seep into the ground to replenish groundwater; the diameter of the pores in the ditch sill 1 is 0-5 mm; the pore density is 100 pores / m³. 2 ~200 pieces / m 2 The porosity and density of the aforementioned ditch sill 1 are set according to the soil conditions and moisture content. When the bottom of the subsurface flow ecological open ditch is soil or grass, pores are provided at the bottom of the ditch sill 1 to allow rainwater to infiltrate into the ground and replenish groundwater. In this application, a pore diameter of 2mm and a density of 100-200 pores / m² are used as an example. When rainwater flows in the ecological open ditch, it enters the ground through the pores at the bottom of the ditch sill 1, thus replenishing groundwater. When laying a subsurface flow ecological open ditch in an existing drainage ditch, the subsurface flow ecological open ditch unit can be directly laid within it. In this case, no pores are provided at the bottom of the ditch sill 1, and the enclosure structure 2 of the subsurface flow ecological open ditch unit can be removed. The subsurface flow ecological open ditch unit, consisting only of the ditch sill 1, can be directly laid and spliced ​​onto the bottom of the drainage ditch.

[0033] The bottom surfaces of the enclosure structure 2 and the ditch sill 1 of the aforementioned ecological open ditch can be of an appropriate form to meet the purpose of rainwater collection and flow; for example, the enclosure structure 2 can be set perpendicularly to or inclined to the bottom surface of the ditch sill 1. In this application, a vertical setting is taken as an example.

[0034] To facilitate installation, transportation, and setup of the subsurface flow ecological open ditch, preferably, the length of the subsurface flow ecological open ditch unit is 2m to 4m. The material of the subsurface flow ecological open ditch unit can be a lightweight, corrosion-resistant, and erosion-resistant polymer, such as at least one of polyethylene, polypropylene, or polyvinyl chloride. The specific material can be selected according to actual needs. In this application, the material used is polyethylene or polypropylene.

[0035] like Figure 4 As shown, according to the second aspect of this application, a subsurface flow ecological open ditch is proposed, which is formed by combining the aforementioned subsurface flow ecological open ditch units. The aforementioned subsurface flow ecological open ditch is laid as a whole on a leveled soil surface or a low-lying area of ​​a lawn, forming a certain longitudinal slope. The backfill soil on both radial sides of the ecological open ditch unit is flush with or slightly lower than the edge of the ecological open ditch by 1-2 cm; or the subsurface flow ecological open ditch is laid and spliced ​​in an existing drainage ditch. In this case, the enclosure structure 2 is not required.

[0036] The adjacent open ditch units of the above-mentioned subsurface flow ecological ditch are connected by interlocking fasteners.

[0037] like Figure 5 As shown, according to a preferred embodiment of this application, the subsurface flow ecological open ditch further includes a micro-retention tank 3, which is disposed in the ditch sill 1. The micro-retention tank 3 may include, from bottom to top: a gravel layer 31, which is graded on the bottom surface of the ditch sill 1; a sediment layer 32, which is formed by the deposition of suspended pollutants and silt in sewage; and a vegetation layer 33, which is formed naturally and / or by artificial sowing of grass seeds. After splicing the subsurface flow ecological open ditch units into a subsurface flow ecological open ditch, a permeable geotextile 34 is first laid at the bottom of the ditch sill 1, and gravel is laid on top of the geotextile 34. The gravel layer 31 is 2-5 cm away from the bottom of the ecological open ditch (i.e., the top of the ditch sill 1). When laying subsurface flow ecological open ditch units on existing hard drainage ditches, only the gravel layer 31 needs to be laid, and the geotextile 34 is not required.

[0038] The aforementioned crushed stone layer is a graded crushed stone layer, and the particle size range of the aforementioned crushed stone layer is 10mm to 30mm.

[0039] The geotextiles described above can be of any suitable form, as long as they can fulfill the functions of separating the soil layer from building materials, preventing the loss of vegetation and sediment filling materials, and allowing water permeability. These geotextiles can isolate the soil layer from the gravel layer and also prevent the loss of the planting soil (sediment layer) from the vegetation layer.

[0040] The aforementioned sediment layer 32 is formed after rainfall, when rainwater runoff from the area around the subsurface ecological open ditch converges, and suspended pollutants and a large amount of silt and sand from the initial cement are deposited on top of the gravel layer 31. As the ecological open ditch is used for a longer period of time, more and more sediment is deposited, thus forming sediment layer 32.

[0041] The aforementioned vegetation layer 33 can form naturally during the gradual formation of the sediment layer 32, or it can be formed by artificially sowing grass seeds after the sediment layer 32 has formed. The grass seeds mentioned above can be selected according to actual needs.

[0042] The preferred embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0043] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0044] Furthermore, various different embodiments of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed by this invention.

Claims

1. A subsurface flow ecological open ditch unit, characterized in that, This underground flow ecological open ditch unit includes: Multiple ditch embankments (1) are installed at the bottom of the subsurface flow ecological open ditch unit in a sunken manner, and are spaced apart at the bottom of the subsurface flow ecological open ditch unit; and are installed perpendicular to the extension direction of the subsurface flow ecological open ditch. Enclosure structure (2) is provided along the extension direction of the ecological open ditch.

2. The subsurface flow ecological open ditch unit according to claim 1, characterized in that, The spacing between the ditches (1) is 1m to 2m, and the depth of the ditches (1) is 10cm to 20cm.

3. The subsurface flow ecological open ditch unit according to claim 2, characterized in that, The cross-section of the ditch (1) in the radial direction of the ecological open ditch is one of a rectangle, a triangle or an arc.

4. The subsurface flow ecological open ditch unit according to claim 3, characterized in that, The bottom of the ditch (1) is provided with pores to replenish groundwater.

5. The subsurface flow ecological open ditch unit according to claim 4, characterized in that, The diameter of the pores in the groove (1) is 0-5 mm; the pore density is 100 pores / m³. 2 ~200 pieces / m 2 .

6. The subsurface flow ecological open ditch unit according to claim 1, characterized in that, The enclosure structure (2) is set perpendicularly to or inclined to the bottom surface of the ditch (1).

7. The subsurface flow ecological open ditch unit according to claim 1, characterized in that, The length of the subsurface flow ecological open ditch unit is 2m to 4m, and the material is a polymer, including at least one of polyethylene, polypropylene or polyvinyl chloride.

8. A subsurface flow ecological open ditch, characterized in that, The subsurface flow ecological open ditch is formed by combining subsurface flow ecological open ditch units as described in any one of claims 1-7.

9. A subsurface flow ecological open ditch according to claim 8, characterized in that, The subsurface ecological open ditch also includes a micro-regulating tank (3), which is set in the ditch embankment (1).

10. The subsurface flow ecological open ditch according to claim 9, characterized in that, The micro-storage tank (3) comprises, from bottom to top: A gravel layer (31) is provided on the bottom surface of the ditch (1); Sediment layer (32), which is formed by the deposition of suspended pollutants and silt in sewage; Vegetation layer (33), which is formed naturally and / or by artificial sowing of grass seeds.

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