CN211057721U - River dike system combining purification of initial rainwater - Google Patents

Abstract

The utility model relates to a river course embankment system of initial stage rainwater is purified in combination. The utility model aims at providing a simple structure, construction convenience, cost are lower, need not the river course embankment system of initial stage rainwater of combination purification that additionally takes up an area of to reduce the pollution to river course quality of water. The technical scheme of the utility model is that: the utility model provides a river course dyke system of initial stage rainwater purifies in combination, is equipped with the levee top road at the top of river course dyke, its characterized in that: a rainwater well is arranged on the side, close to water, of the embankment top road, a low-water-level drainage pipe corresponding to the lower portion of the rainwater well and a high-water-level drainage pipe corresponding to the upper portion of the rainwater well are connected to the rainwater well, the low-water-level drainage pipe is communicated with a river channel through a water treatment mechanism, and the high-water-level drainage pipe is connected with a peripheral municipal rainwater system. The utility model is suitable for an ecological environment engineering technical field can be applied to ecological purification of river course dyke roof way initial stage rainwater.

Description

River dike system combined with purification of initial rainwater

technical field

The utility model relates to a river embankment system combined with purifying initial rainwater. It is suitable for the field of ecological environment engineering technology, and can be applied to the ecological purification of rainwater in the initial stage of river embankment and road.

Background technique

According to the requirements of the "Water Ten Regulations" for water pollution control, rainwater and sewage diversion shall be implemented in the construction of new urban areas, and the initial rainwater collection, treatment and resource utilization shall be recommended in areas where conditions permit. The pollution degree of rainwater in the initial stage is relatively high, which usually exceeds that of ordinary urban domestic sewage. The pollutant load in the initial runoff accounts for more than 70% of the entire rainfall, and the initial scouring effect is obvious. Therefore, it is necessary to collect and process the initial rainwater. The technical means of conventional treatment of initial rainwater are mainly storage and post-treatment, which require large investment and occupy a lot of land.

The positioning of traditional urban river embankments is to prevent floods and drain waterlogging, protect residents' production as the goal, and limit floods to floodways. The road rainwater is discharged into the river through the rainwater pipe network, ignoring the treatment of the initial rainwater pollution on the road, increasing the pollution load of the river.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present utility model is: aiming at the above-mentioned problems, it provides a river embankment system which is simple in structure, convenient in construction, low in cost, and requires no additional land occupation and which is combined with purifying initial rainwater, so as to reduce the pollution to the water quality of the river. .

The technical scheme adopted by the utility model is: a river embankment system combined with purifying initial rainwater, a dike top road is arranged on the top of the river embankment, and it is characterized in that: a rainwater well is arranged on the water-facing side of the dike top road, The rainwater well is connected with a low water level drainage pipe corresponding to the lower part of the rainwater well and a high water level drainage pipe corresponding to the upper part of the rainwater well.

The water treatment mechanism has a vegetation buffer zone, a gravel filter zone and a subsurface constructed wetland sequentially connected to the water outlet of the low water level drainage pipe.

The vegetation buffer zone is arranged on the gentle slope of the embankment on the water-facing side of the road at the top of the embankment. The toe of the gentle slope of the embankment is provided with a vertical artificial retaining wall, and the top of the vertical artificial retaining wall is provided with the gravel filter belt and the undercurrent. Artificial wetland.

The vegetation buffer zone includes three-dimensional plant nets and slope plants laid on the gentle slope of the embankment.

The slope ratio of the embankment is gentler than 1:3; the plants on the slope are bermudagrass, green grass, and Manila.

The gravel filter belt adopts a pebble alloy cage, the mesh size is D×H=8cm×10cm, the pebble should be clean, and the particle size is 10-20cm.

The subsurface constructed wetland includes wetland structures, filler purification units and wetland plants.

The wetland structure is a brick structure; the packing purification unit comprises a cushion layer, two cloths and one membrane, and a filter material layer, which are sequentially arranged from bottom to top.

The cushion layer is a sand cushion layer; the two cloths and one membrane are laid on the sand cushion layer with 600g/m ² geotextile, then lay HDPE composite geomembrane, and then lay 120g/m ² geotextile protective layer on the geomembrane Described filter material layer is the gravel filter material layer of 16-32mm, the gravel filter material layer of particle diameter 8-16mm, the zeolite filter material layer of particle diameter 5-8mm, the gravel filter material of particle diameter 8-16mm layer and a crushed stone filter material layer with a particle size of 5-8 mm; the wetland plants include cattail, shallot, and Siberian iris.

The top of the vertical artificial retaining wall needs to be 1.0m higher than the normal water level of the river.

The beneficial effects of the utility model are: the utility model collects rainwater through the rainwater well, and drains the water through the high-water level drainage pipe and the low-water level drainage pipe arranged at high and low levels respectively when the rainfall is relatively large and relatively small, and when the rainfall is relatively large, the high-water level drainage pipe is used. It will be discharged into the surrounding municipal rainwater system. When the rainfall is small, it will be discharged into the river channel through the low-water level drainage pipe after being treated by the water treatment organization, so as to reduce the pollution to the water quality of the river channel.

The reclaimed water treatment mechanism of the utility model comprises a vegetation buffer belt, a gravel filter belt and a subsurface artificial wetland. The vegetation buffer belt is arranged on the gentle slope of the embankment, and the gravel filter belt and the subsurface artificial wetland are arranged on the top of the vertical artificial retaining wall. The structure is simple, and the existing It has a structure and occupies a small area.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment.

FIG. 2 is a schematic diagram of the structure of the subsurface constructed wetland in the embodiment.

FIG. 3 is a flow chart of initial rainwater treatment in the embodiment.

Detailed ways

As shown in FIG. 1 , the present embodiment is a river embankment system combined with purifying initial rainwater. A dike road 1 is provided on the top of the river embankment, and the river embankment and the water-facing side of the dike road 1 are provided with embankment gentle slopes (slopes). The ratio is slower than 1:3), and a vertical artificial retaining wall 10 is provided at the foot of the gentle slope of the embankment.

In this embodiment, a rainwater well 2 is provided on the water-facing side of the road 1 on the top of the embankment. The rainwater well 2 is connected with a low-water level drainage pipe 4 and a high-water level drainage pipe 3, wherein the water inlet of the low-water level drainage pipe 4 is connected to the lower part of the rainwater well 2 The water outlet of the low water level drainage pipe 4 is connected to the river channel through the water treatment mechanism, the water inlet of the high water level drainage pipe 3 is connected to the upper area of the rainwater well 2, and the water outlet of the high water level drainage pipe 3 is connected to the surrounding municipal rainwater system. In this example, the water treatment mechanism has a vegetation buffer zone, a gravel filter zone and a subsurface flow constructed wetland 8 connected to the water outlet of the low water level drainage pipe 4 in sequence. river course.

In this embodiment, the vegetation buffer zone is set on the gentle slope of the embankment. The vegetation buffer zone mainly includes a three-dimensional plant net 5 and slope plants 6. The three-dimensional plant net 5 can effectively protect the slope soil from being washed away by rainwater, and the slope protection plants can effectively protect the slope. In order to reduce the pollutants of the initial rainwater and reduce the impact on the constructed wetland, the slope plants 6 are selected from bermudagrass, green grass, manila and so on.

In this example, the gravel filter belt is the foot protection of the soil slope of the embankment system, and it is a pebble alloy cage 7. The mesh size is D×H=8cm×10cm. The pebble should be clean and the particle size should be 10-20cm. The gravel filter belt can filter the rainwater on the slope surface to prevent rainwater with high mud content from entering the subsurface flow constructed wetland 8, causing the wetland to block, and serve as a uniform water distribution system for the constructed wetland.

The subsurface constructed wetland 8 is arranged in the vertical artificial retaining wall 10 at the foot of the embankment system. As a part of the hydrophilic trail, the influent water of the subsurface constructed wetland 8 is introduced into the initial rainwater through the gravel filter belt, and then the polluted water is treated by the wetland treatment system. After purification, it is discharged into the river.

As shown in FIG. 2 , the subsurface constructed wetland 8 includes a wetland structure 801, a filler purification unit 802 and a wetland plant 803. The wetland structure includes a side wall and a partition wall of a brick structure, and the filler purification unit and the wetland plants are arranged on the side wall and the partition wall. within the wetland pool. Wetland plants include cattails, shallots, Siberian irises, and more.

In this example, the packing purification unit includes a cushion layer 8031, two cloths and one membrane 8032, and a filter material layer 8033 arranged from bottom to top in sequence. The cushion layer 8031 is a sand cushion layer; two cloths and one film 8032, that is, lay 600g/m ² geotextile on the sand cushion layer, then lay HDPE composite geomembrane, and then lay a 120g/m ² geotextile protective layer on the geomembrane; The filter material layer 8033 is a 16-32mm crushed stone filter material layer, a crushed stone filter material layer with a particle size of 8-16mm, a zeolite filter material layer with a particle size of 5-8mm, a crushed stone filter material layer with a particle size of 8-16mm and The crushed stone filter material layer with a particle size of 5-8mm.

In this embodiment, the top of the vertical artificial retaining wall is a hydrophilic trail. In order to coordinate the subsurface artificial wetland 8 with the hydrophilic trail and ensure the normal operation of the subsurface artificial wetland 8, the top of the vertical artificial retaining wall needs to be 1.0 higher than the normal water level of the river. m, the top width of the vertical artificial retaining wall is greater than 2.0m. The subsurface constructed wetland 8 has a total depth of 1.0m and a total width of 1.0m, and is arranged along the direction of the vertical artificial retaining wall 10 .

When the rainfall is large, the rainwater collected by the rainwater well 2 is normally discharged from the upper high-water-level drainage pipe 3 connected to the surrounding municipal rainwater pipe network; when the rainfall is small, the initially polluted rainwater is evenly discharged through the low-water-level perforated drainage pipe 9 into the paved three-dimensional plants. The embankment of the net 5 and the slope plants 6 is intercepted and absorbed by the slope matrix and plants to initially degrade the pollutants in the water body; the initial rainwater reaches the pebble alloy cage 7 through gravity flow, and the pebble alloy cage 7 can be used as gravel The bed can purify the initial rainwater again, and at the same time block the soil particles that flow down with the rainwater to prevent clogging of the underflow constructed wetland 8; the water flow uniformly flows from the pebble alloy cage 7 into the underflow constructed wetland 8, and the underflow is still wetlands to strengthen the purification effect The polluted water is treated, and the purified water is discharged into the river channel through the drainage pipe 9 through the perforated water collecting pipe 11 buried at the bottom of the wetland (see Fig. 3).

Of course, the above description does not limit the present utility model, and the present utility model is not limited to the above examples. Those of ordinary skill in the art, within the scope of the present utility model, make changes, additions or replacements, all should belong to the present invention. The scope of protection of the utility model.

Claims (10)

1. The utility model provides a river course dyke system of initial stage rainwater is purified in combination, is equipped with levee crown road (1) at the top of river course dyke, its characterized in that: the side of the levee crown road (1) facing the water is provided with a catch basin (2), the catch basin (2) is connected with a low water level drain pipe (4) corresponding to the lower part of the catch basin (2) and a high water level drain pipe (3) corresponding to the upper part of the catch basin (2), wherein the low water level drain pipe (4) is communicated with a river channel through a water treatment mechanism, and the high water level drain pipe (3) is connected with a peripheral municipal rainwater system.

2. A waterway embankment system in combination with purification of incipient rain according to claim 1, wherein: the water treatment mechanism is provided with a vegetation buffer zone, a gravel filter zone and an undercurrent artificial wetland (8) which are sequentially connected with the water outlet of the low-water-level drain pipe (4), the bottom of the undercurrent artificial wetland (8) is communicated with a drain pipe (9) through a perforated water collecting pipe (11), and the drain pipe (9) extends to a river channel.

3. A waterway embankment system in combination with purification of incipient rain according to claim 2, wherein: the vegetation buffer zone is arranged on a dike gentle slope on the waterside side of the dike top road (1), a vertical artificial retaining wall (10) is arranged at the slope toe of the dike gentle slope, and the gravel filter zone and the subsurface flow artificial wetland (8) are arranged at the top of the vertical artificial retaining wall (10).

4. A waterway embankment system in combination with purification of incipient rain according to claim 3, wherein: the vegetation buffer zone comprises a three-dimensional plant net (5) and slope plants (6) which are laid on the dike gentle slope.

5. The river bank system in combination with purification of incipient rain of claim 4, wherein: the gradual slope ratio of the dike is less than 1: 3; the slope plants (6) are selected from Bermuda grass, green grass and manila.

6. The river embankment system for combined purification of initial rainwater according to claim 2 or 3, wherein the gravel filter belt adopts a pebble alloy net cage (7), the mesh D × H is 8cm × 10cm, pebbles are required to be clean, and the particle size is 10-20 cm.

7. A waterway embankment system in combination with purification of incipient rain according to claim 2, wherein: the subsurface flow constructed wetland (8) comprises a wetland structure (801), a filler purification unit (802) and wetland plants (803).

8. A waterway embankment system in combination with purification of incipient rain according to claim 7, wherein: the wetland structure (801) is of a brick structure; the filler purification unit (802) comprises a cushion layer (8031), two cloth-one membranes (8032) and a filter material layer (8033) which are arranged from bottom to top in sequence.

9. A waterway embankment system in combination with purification of incipient rain according to claim 8, wherein: the cushion layer (8031) is a sand cushion layer; the two cloth films (8032) are formed by laying 600g/m on a sand cushion layer²Laying HDPE composite geomembrane on the geotextile, and laying 120g/m on the geomembrane²A geotextile protective layer; the filter material layer (8033) is a crushed stone filter material layer with the particle size of 16-32mm, a crushed stone filter material layer with the particle size of 8-16mm, a zeolite filter material layer with the particle size of 5-8mm, a crushed stone filter material layer with the particle size of 8-16mm and a crushed stone filter material layer with the particle size of 5-8 mm; the wetland plants (803) comprise cattail, Scirpus tabernaemontani and Siberian iris.

10. A waterway embankment system in combination with purification of incipient rain according to claim 3, wherein: the top of the vertical artificial retaining wall (10) is required to be 1.0m higher than the normal water level of the river.

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