CN103758201B - Band floods the clean integrated apparatus of surface flow rain-water accumulating and the method for culvert pipe - Google Patents

Abstract

The invention relates to an integrated device and method for storing and purifying surface runoff rainwater with a submerged culvert. The device includes a pre-sedimentation chamber (1) and a wetland unit (2). The plate (4) enters the wetland unit (2); perforated culvert pipes (3) are arranged side by side in the wetland unit (2), and the culvert pipes (3) cross both sides of the wetland unit (2), with perforated plugs ( 12); the wetland unit (2) includes a gravel cushion (9), a sand filter layer (8) and a planting soil layer (7), and a perforated drainage pipe (5) is embedded in the gravel cushion (9). The device and method can remove particles and dissolved pollutants in runoff rainwater, and realize the removal of pollutants in rainwater runoff; the treated rainwater is stored inside the device and in the culvert (3), not only for the growth of wetland plants, but also for By submerging the two ends of the culvert inside the wetland to infiltrate the surrounding soil, the purpose of continuous conservation and replenishment of groundwater is achieved.

Description

Integrated device and method for surface runoff rainwater storage and purification with submerged culvert

technical field

The invention relates to an integrated rainwater wetland tank with submerged culverts for storage and purification and a method for treating runoff rainwater, in particular to an integrated device and method for surface runoff rainwater storage and purification with submerged culverts.

Background technique

Rainwater is an important part of the urban water cycle and regional water cycle system, and plays a key role in regulating and replenishing groundwater resources and improving the ecological environment. With the acceleration of urbanization in our country, the impermeable area of cities is increasing day by day, and the natural cycle of rainwater is threatened, which leads to the following problems.

(1) Frequent occurrence of waterlogging: The construction of impermeable pavement blocks the infiltration channel of rainwater, reduces the amount of rainwater infiltration, increases the peak flow of runoff, and reduces the time of confluence, which eventually overwhelms the drainage network, resulting in frequent waterlogging.

(2) Serious runoff pollution: The impermeable urban surface becomes the accumulation area of various pollutants in human activities, and the pollutants are finally discharged into the urban water body or partially infiltrated into the ground under the erosion of rainwater runoff, causing serious pollution to the urban water body and infiltrated soil .

(3) Massive loss of rainwater resources: my country is a country seriously short of water resources, and the acceleration of urbanization has made our cities face more severe water shortage problems. However, in order to prevent waterlogging, my country's rainwater drainage system has always run through the guiding ideology of "quick drainage", and a large amount of rainwater resources are lost in vain. Not only can it not replenish groundwater in time to alleviate the shortage of water resources, but also increase the drainage network and sewage treatment plants. and the burden on the water environment.

(4) Deterioration of the ecological environment: The large-scale expansion of the city has broken the original ecological balance system, resulting in a decrease in biodiversity, and due to the erosion of rainwater runoff, it will also lead to soil erosion and vegetation destruction. The value of natural and cultural landscapes has had a negative impact. At the same time, the increase in the proportion of impermeable ground prevents groundwater from being replenished in time, affecting the city's natural water cycle.

It can be seen that it is of great significance to promote the natural cycle of rainwater in the process of urbanization. The construction of the natural circulation system of rainwater needs to change the original idea of "quick drainage", increase the infiltration and stagnation capacity of rainwater, and finally achieve the purpose of reducing rainwater discharge, peak shaving and conserving groundwater. On the other hand, with the intensification of runoff rainwater pollution, the purification of runoff rainwater is of great significance to reduce its pollution to water bodies and soil. Therefore, the stagnation and purification of surface runoff rainwater is particularly important for the natural cycle of rainwater.

For example, the Chinese invention patent with application number 201210335370.1 discloses a new type of vegetation shallow ditch and its method for treating runoff rainwater. The new type of vegetation shallow ditch includes a vegetation layer and a shallow ditch, and the shallow ditch includes the bottom of the shallow ditch and the side slope. Seepage pipes are buried at the bottom of the shallow ditch. When the surface runoff rainwater enters the shallow ditch and flows along the slope, the runoff can be purified through retention, vegetation filtration, adsorption and infiltration, and part of it gathers at the bottom of the shallow ditch. A seepage pipe is designed to make the transmission, filtration and infiltration of the shallow ditch The capacity has been significantly improved, and the floor area is small and the structure is compact. However, the purified rainwater in this invention will soon be infiltrated into the bottom layer, making it difficult to store.

Another example is the Chinese invention patent with application number 201010277742.0, which discloses a method for initial rainwater collection, diversion, peak shaving and ecological purification. The rainwater enters the rainwater storage tank through the municipal rainwater pipeline, and through the automatic control of the pump, the initial storm runoff with serious pollution is separated and sent to the surface grass planting ditch for ecological purification and local irrigation; It can enter municipal pipelines or be directly discharged into landscape rivers for utilization. The method is assisted with the surrounding greening landscape, and the invention can collect and store rainstorms, effectively separate and purify them, has a small occupied area, and can be automatically controlled. But the present invention needs the assistance of multiple departments, and the cost of construction is relatively high.

Contents of the invention

The purpose of the present invention is to provide an integrated device and method for surface runoff rainwater storage and purification with submerged culverts, which can remove particulate matter and dissolved pollutants in runoff rainwater, and realize the removal of pollutants in rainwater runoff. Part of the treated rainwater It can be stored inside the device and in the submerged culvert, not only for the growth of wetland plants, but also seep into the surrounding soil through the two ends of the submerged culvert inside the wetland, so as to achieve the purpose of continuous conservation and replenishment of groundwater; through this device, the quality and quantity of rainwater runoff can be achieved. Multi-objective control.

In order to realize above-mentioned design object, the scheme that the present invention adopts is as follows:

An integrated device for surface runoff rainwater storage and purification with a submerged culvert, the device includes a pre-sedimentation chamber and a wetland unit placed in a box, a rainwater grate is arranged on the top of the pre-settling chamber; multiple perforations are arranged in the wetland unit the culvert. The device and method can remove particulate matter and dissolved pollutants in runoff rainwater, realize the removal of pollutants in rainwater runoff, and can also store part of the purified runoff rainwater inside the device and in submerged culverts, not only for the growth of wetland plants, It can also continue to infiltrate the surrounding soil by submerging both ends of the culvert pipe after the rainfall ends, so as to achieve the purpose of continuously conserving and replenishing groundwater; through this device, multi-objective control of rainwater runoff water quality and water quantity can be realized.

Preferably, a perforated partition is provided between the pre-sedimentation chamber and the wetland unit. The pre-sedimentation chamber and the integrated wetland unit with submerged culverts are separated by a perforated partition, and the height of the groove of the perforated partition is lower than the top of the above-mentioned box. When the amount of rainwater exceeds the height of the groove of the perforated partition When it enters the wetland unit directly and then discharges through the overflow pipe, the plants in the wetland unit are avoided from being submerged.

Preferably, a plurality of submerged perforated culverts are arranged in the wetland unit, and the position of the submerged perforated culverts is lower than the outlet of the perforated drainage pipes, and the rainwater purified by the sand filter layer can be stored in the culverts, and can pass through the two culverts after the rainfall ends. The end-perforated plug continuously infiltrates water into the surrounding soil to achieve the purpose of supplementing and conserving groundwater. In the prior art, the water collection space of the filler is much smaller than the water storage space of the submerged perforated culvert, so that the culvert increases the water storage capacity of the rainwater wetland.

In any of the above schemes, preferably, the pre-sedimentation chamber receives runoff rainwater, and removes particulate matter in the runoff rainwater after sedimentation.

In any of the above schemes, preferably, the wetland unit is laid with a gravel cushion, a sand filter layer and a planting soil layer from bottom to top, and plants are planted on the planting soil layer. The advantage of laying the gravel cushion, sand filter layer and planting soil layer from bottom to top is that the rainwater entering the pre-sedimentation chamber will slowly enter the wetland unit after being intercepted by the perforated partition, and then infiltrate into the sand filter layer After being purified by the interception of the sand filter layer and the metabolism of microorganisms on it, the rainwater in the sand filter layer slowly infiltrates into the planting soil layer for plant absorption. Among them, the sandstone cushion plays the role of supporting the sand filter layer and reserving a certain space for placing perforated drainage pipes.

In any of the above schemes, it is preferred that the perforated partition is a concave-shaped plate with a plurality of perforations on its surface. The rainwater entering the pre-sedimentation chamber will pass through the interception of the perforated partition and then slowly enter the wetland unit and then infiltrate into the sand filter layer. The rainwater in the sand filter layer will slowly infiltrate into the planting soil layer after being purified by the sand filter layer for plant uptake.

In any of the above schemes, preferably, the height of the groove of the perforated partition is lower than the top of the box body; the groove of the perforated partition is higher than the top of the planting soil layer.

In any of the above schemes, it is preferable that a geotextile is laid on the side of the perforated partition close to the sand filter layer, so as to prevent the gravel in the wetland unit from entering the pre-sedimentation chamber through the perforated partition and reduce the sedimentation space of the pre-sedimentation chamber.

In any of the above schemes, preferably, the perforated drainage pipe is buried in the gravel cushion, and the outlet of the perforated drainage pipe is higher than the culvert.

In any of the above schemes, preferably, the perforated drainage pipe is composed of an inner perforated pipe and an outer upwardly bent sealing pipe, the part of the outer wall buried in the gravel cushion is perforated, and the part beyond the box is a sealed round Tube. During light rain, when the runoff flow of rainwater is less than the infiltration and storage capacity of the integrated rainwater wetland unit with submerged culvert, the rainwater enters the wetland purification unit through the perforation of the perforated partition, and the water flow enters the wetland unit in the form of lateral infiltration, and the water flow inside the wetland The direction is horizontal flow and upward flow, and the liquid level inside the wetland unit continues to rise. When the liquid level reaches the external outlet of the perforated discharge pipe of the device, the rainwater purified by the wetland unit is discharged to the underground rainwater pipe through the perforated drain pipe; moderate rain or heavy rain When the runoff flow rate of rainwater is greater than the infiltration and storage capacity of the integrated rainwater wetland unit with submerged culvert, the rainwater not only enters the wetland purification unit through the perforation of the perforated partition, but also overflows through the groove on the top of the pre-sedimentation chamber beyond the perforated partition. The rainwater flows into the wetland purification unit, and the rainwater enters the wetland unit in a composite way of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland purification unit is discharged from the overflow pipe to the underground rainwater pipe. When the liquid level inside the wetland unit rises to the outlet of the device's perforated discharge pipe, the rainwater purified by the wetland unit is discharged to the underground rainwater pipe through the perforated drainpipe.

In any of the above schemes, it is preferred that the outlet is flush with the top of the sand filter layer. The height of the outlet of the perforated drainage pipe is flush with the top of the sand filter layer, which ensures that the rainwater entering the wetland unit will not exceed the planting soil layer, thereby ensuring the safety of the plants in the planting soil layer.

In any of the above schemes, preferably, an overflow pipe is provided on one side of the wetland unit, and the overflow pipe is on the same side as the outlet. During moderate rain or heavy rain, when the runoff flow of rainwater is greater than the infiltration and storage capacity of the integrated rainwater wetland unit with submerged culvert, the rainwater not only enters the wetland purification unit through the perforation of the perforated partition, but also passes through the top of the pre-sedimentation chamber beyond the perforated partition The groove overflows into the wetland purification unit, and the rainwater enters the wetland unit through a combination of lateral infiltration and vertical infiltration. The rainwater exceeding the infiltration and storage capacity of the wetland purification unit is discharged from the overflow pipe to the underground rainwater pipe, ensuring the planting soil of plants will not be drowned by too much rain.

In any of the above schemes, preferably, the outlet of the overflow pipe is higher than the planting soil layer. The rainwater that exceeds the infiltration and storage capacity of the wetland purification unit is discharged from the overflow pipe to the underground rainwater pipe, ensuring that the plants planted in the soil layer will not be submerged due to excessive rainwater.

In any of the above schemes, preferably, the wall of the culvert is perforated, and the outer wall of the culvert is wrapped with a geotextile. Wrapping the geotextile on the outer wall of the culvert can effectively prevent fine gravel from entering the inside of the culvert and prevent the culvert from losing its water storage space.

In any of the above schemes, it is preferable that both ends of the culvert pass through the box body, and perforated plugs are installed at both ends. Perforated plugs are installed at both ends of the culvert to ensure that the water stored in the culvert slowly infiltrates into the surrounding soil after the rainfall ends, thereby continuously conserving groundwater.

In any of the above schemes, preferably, the plug is perforated, and its exterior is wrapped with a geotextile, which prevents the soil outside the device from entering the interior of the culvert from both ends of the culvert to block the culvert and cause the culvert to lose its ability to store water.

Another aspect of the present invention is to also provide a method of using the above-mentioned surface runoff rainwater storage and purification integrated device with a submerged culvert, including the following steps:

The vegetation shallow ditch transfers surface runoff rainwater or road rainwater runoff to the rainwater grate and flows into the pre-sedimentation chamber. Enter the wetland unit in the way of infiltration; among them, the water flow direction inside the wetland unit is horizontal flow and upward flow, and the liquid level inside the wetland unit continues to rise. When the liquid level reaches the position of the outlet, the rainwater purified by the wetland unit passes through the perforated drainage pipe Drain to underground storm sewers. During moderate rain or heavy rain, when the rainwater runoff flow is greater than the infiltration and storage capacity of the wetland unit, the rainwater not only enters the wetland unit through the perforation of the perforated partition, but also overflows into the wetland unit through the top of the pre-sedimentation chamber beyond the groove of the perforated partition , rainwater enters the wetland unit in a composite way of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland unit is discharged from the overflow pipe to the underground rainwater pipe; among them, when the internal liquid level of the wetland unit rises to the position of the outlet, The rainwater purified by the wetland unit is discharged to the underground rainwater pipe through the perforated drainage pipe.

To sum up, the working principle of the present invention is: the vegetation shallow ditch transfers surface runoff rainwater or road rainwater runoff to the rainwater grate and flows into the pre-sedimentation chamber. When the infiltration and storage capacity is high, the rainwater enters the wetland purification unit through the perforation of the perforated partition, and the water flow enters the wetland unit in the form of lateral infiltration. When facing to the external outlet of the perforated discharge pipe of the device, the rainwater purified by the wetland unit is discharged to the underground rainwater pipe through the perforated drainage pipe; during moderate or heavy rain, the runoff flow of rainwater is greater than that of the integrated rainwater wetland unit with submerged culvert. When the infiltration and storage capacity is reached, the rainwater not only enters the wetland purification unit through the perforation of the perforated partition, but also enters the wetland purification unit through the top of the pre-sedimentation chamber beyond the perforated partition and overflows through the groove, and the rainwater is combined in the form of lateral infiltration and vertical infiltration After entering the wetland unit, the rainwater exceeding the infiltration and storage capacity of the wetland purification unit is discharged from the overflow pipe to the underground rainwater pipe. When the internal liquid level of the wetland unit rises to the position of the external outlet of the perforated discharge pipe of the device, the rainwater purified by the wetland unit is discharged to the underground rainwater pipe through the perforated drainpipe.

In the above two cases, the inside of the wetland unit is in a submerged state, so that part of the purified rainwater runoff can be stored and stored inside the device for the growth of wetland plants, and the purified runoff rainwater can be retained in the submerged culvert pipe and penetrate into the surrounding area from the perforated plugs at both ends. Soil, which can sustainably hold groundwater after rainfall ends.

Description of drawings

Fig. 1 is a cross-sectional schematic diagram of an embodiment of an integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention.

Fig. 2 is a schematic structural view of the perforated partition in Fig. 1 of the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention.

Fig. 3 is a top view of Fig. 1 of the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention.

Fig. 4 is a top view of the perforated drainage pipe in Fig. 1 of the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention.

Explanation of symbols in the figure:

Pre-sedimentation chamber 1, wetland unit 2, culvert pipe 3, perforated partition 4, perforated drainage pipe 5, overflow pipe 6, planting soil layer 7, sand filter layer 8, gravel cushion layer 9, plants 10, rainwater grate 11, plug Head 12, outlet 13.

Detailed ways

In order to better understand the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention, the specific implementation of the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention will be described below in conjunction with the accompanying drawings example.

Referring to FIG. 1 , it is a schematic diagram of the overall structure of the integrated device and method for surface runoff rainwater storage and purification with submerged culverts according to the present invention. An integrated device for surface runoff rainwater storage and purification with submerged culverts, the device includes a pre-sedimentation chamber 1 and a wetland unit 2 placed in a box, and a rainwater grate 11 is arranged on the top of the pre-settling chamber 1; the wetland unit 2 A plurality of perforated culverts 3 are arranged in the center. The device and method can remove particulate matter and dissolved pollutants in runoff rainwater, realize the removal of pollutants in rainwater runoff, and can also store part of the purified rainwater inside the device and in perforated culvert pipes, not only for the growth of wetland plants, but also The perforated culvert 3 inside the wetland unit 2 can seep into the surrounding soil through the perforated plugs 12 at both ends, so as to achieve the purpose of continuous conservation and replenishment of groundwater; through this device, multi-objective control of rainwater runoff water quality and water quantity can be realized; frequent waterlogging can be solved There are technical problems such as hair loss, serious runoff pollution, massive loss of rainwater resources, and serious damage to the ecological environment. In the prior art, fillers are used for water collection, and the water collection space of the fillers is much smaller than the water storage space of submerged perforated culverts, so that the culverts increase the water storage capacity of rainwater wetlands.

In this embodiment, a perforated partition 4 is provided between the pre-sedimentation chamber 1 and the wetland unit 2 . The pre-sedimentation chamber 1 is separated from the integrated wetland unit 2 with submerged culverts for storage and purification by a perforated partition 4, and the height of the groove of the perforated partition 4 is lower than the top of the above-mentioned box. When the amount of rainwater exceeds the perforated partition 4, the height of the groove directly enters the wetland unit 2 and then is discharged through the overflow pipe 6, thereby preventing the plants 10 in the wetland unit 2 from being submerged.

In this embodiment, the top of the box directly above the wetland unit 2 is open, so that the plants 10 can fully absorb sunlight, which is beneficial to the better growth of the plants 10 .

In this embodiment, the wetland unit 2 is laid with a gravel cushion 9 , a sand filter layer 8 and a planting soil layer 7 from bottom to top, and plants 10 are planted on the planting soil layer 7 . The advantage of laying the gravel cushion layer 9, the sand filter layer 8 and the planting soil layer 7 in order from bottom to top is that the rainwater entering the pre-sedimentation chamber 1 will slowly enter after being intercepted by the perforated partition 4 after the initial precipitation. Into the wetland unit 2 and then infiltrated laterally into the sand filter layer 8 , the rainwater in the sand filter layer 8 slowly infiltrates upwards into the planting soil layer 7 after being purified by the sand filter layer 8 for absorption by the plants 10 . Wherein the gravel cushion layer 9 plays the role of supporting the sand filter layer 8 and reserving a certain space for placing the perforated drainage pipe 5 .

In this embodiment, the height of the groove of the perforated partition 4 is lower than the top of the box body; the groove of the perforated partition 4 is higher than the top of the planting soil layer 7 .

In this embodiment, a geotextile is laid on the side of the perforated partition 4 near the wetland unit 2, so as to prevent the gravel of the sand filter layer 8 of the wetland unit 2 from entering the pre-sedimentation chamber 1 through the perforated partition 4, thereby reducing the weight of the pre-settling chamber 1. Precipitation space.

In this embodiment, the gravel cushion layer 9 is buried in the perforated drainage pipe 5 , and the outlet 13 of the perforated drainage pipe 5 is higher than the submerged perforated culvert pipe 3 .

In this embodiment, the outlet of the overflow pipe 6 is higher than the planting soil layer 7 . The rainwater that exceeds the seepage and storage capacity of the wetland purification unit 2 is discharged from the overflow pipe 6 to the underground rainwater pipeline, which ensures that the plants 10 planted in the soil layer 7 will not be submerged due to excessive rainwater.

In this embodiment, the discharge port 13 is flush with the top of the sand filter layer 8 .

As shown in FIG. 2 , in this embodiment, the perforated partition 4 is a concave-shaped plate with a plurality of perforations on its surface. The rainwater entering the pre-sedimentation chamber 1 will pass through the interception of the perforated partition 4 after initial settlement, then slowly enter the wetland unit 2 and then infiltrate into the sand filter layer 8. After impurity purification, it slowly infiltrates into the planting soil layer 7 for the absorption of the plants 10. It can be seen from this figure that the middle part of the upper part of the perforated partition 4 is lower, and the two sides are slightly higher, thereby ensuring that the rainwater entering the pre-settling chamber 1 is reduced in flow rate when the rainwater is large and passes through the perforated partition 4 , reducing the impact on the plant 10.

As shown in Figure 4, the perforated drainage pipe 5 is connected by an internal perforated pipe and an external upwardly bent sealing pipe. The part of the outer wall buried in the gravel cushion 9 is perforated, and the part beyond the box is a sealed circular pipe. During light rain, when the runoff flow of rainwater is less than the infiltration and storage capacity of the integrated rainwater wetland unit 2 with submerged culverts, the rainwater enters the wetland purification unit 2 through the perforations of the perforated partition 4, and the water flow enters the wetland unit 2 in the form of lateral infiltration , the direction of water flow inside the wetland is horizontal flow and upward flow, the liquid level inside the wetland unit 2 keeps rising, and when the liquid level reaches the position of the external outlet 13 of the perforated discharge pipe of the device, the rainwater purified by the wetland unit 2 is discharged through the perforated drain pipe 5 To the underground rainwater pipeline; during moderate rain or heavy rain, when the rainwater runoff flow rate is greater than the seepage and storage capacity of the integrated rainwater wetland unit 2 with submerged culverts, the rainwater not only enters the wetland purification unit 2 through the perforations of the perforated partition 4, but also passes through the The top of the pre-sedimentation chamber 1 surpasses the groove of the perforated partition 4 and overflows into the wetland purification unit, and the rainwater enters the wetland unit 2 through a combination of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland purification unit flows through the overflow pipe 6 Drain to underground rainwater pipes. When the internal liquid level of the wetland unit rises to the position of the outlet 13 of the perforated discharge pipe 5 of the device, the rainwater purified by the wetland unit 2 is discharged to the underground rainwater pipeline through the perforated drain pipe 5 .

As shown in Figure 3, an overflow pipe 6 is provided on one side of the wetland unit 2, and the overflow pipe 6 is on the same side as the outlet 13. During moderate rain or heavy rain, when the runoff flow of rainwater is greater than the infiltration and storage capacity of the integrated rainwater wetland unit with submerged culvert, the rainwater not only enters the wetland purification unit through the perforation of the perforated partition 4, but also passes through the top of the pre-sedimentation chamber 1 beyond the perforation. The overflow of the groove of the separator 4 enters the wetland purification unit 2, and the rainwater enters the wetland unit 2 in a composite manner of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland purification unit is discharged from the overflow pipe 6 to the underground rainwater pipeline , it is ensured that the plants 10 for planting the soil layer 7 will not be submerged due to too much rain.

In this embodiment, the outer wall of the submerged perforated culvert 3 is wrapped with a geotextile. Wrapping the geotextile on the outer wall of the submerged perforated culvert 3 can effectively prevent fine gravel from entering the inside of the culvert and prevent the culvert from losing its water storage space.

In this embodiment, both ends of the submerged perforated culvert 3 go out of the box, and perforated plugs 12 are installed at both ends. The two ends of the culvert pipe 3 are equipped with perforated plugs 12 to ensure that the water stored in the culvert pipe 3 can still slowly infiltrate into the surrounding soil after the rainfall ends, so as to continuously conserve groundwater. In this embodiment, the outside of the perforated plug 12 is wrapped with a geotextile. Wrapping the geotextile on the outside of the perforated plug 12 prevents the soil outside the device from entering the inside of the culvert from both ends of the culvert to block the culvert, and the culvert 3 loses its function of storing water.

Another aspect of the present invention is to also provide a method of using the above-mentioned surface runoff rainwater storage and purification integrated device with a submerged culvert, including the following steps:

The vegetation shallow ditch transfers surface runoff rainwater or road rainwater runoff to the rainwater grate 11 and flows into the pre-sedimentation chamber 1. During light rain, when the rainwater runoff flow rate is less than the seepage and storage capacity of the wetland unit 2, the rainwater enters the wetland unit through the perforation of the perforated partition 4 2. The water flow enters the wetland unit 2 in the form of lateral infiltration; wherein, the internal water flow direction of the wetland unit 2 is horizontal flow and upward flow, and the internal liquid level of the wetland unit 2 continues to rise. When the liquid level reaches the position of the outlet 13, it passes through the wetland unit The rainwater purified by unit 2 is discharged to the underground rainwater pipe through the perforated drainage pipe 5; among them, during moderate rain or heavy rain, when the rainwater runoff flow rate is greater than the infiltration and storage capacity of the wetland unit 2, the rainwater not only enters the wetland through the perforation of the perforated partition 4 Unit 2 also passes through the top of the pre-sedimentation chamber 1 beyond the perforated partition 4 and overflows into the wetland unit 2 through the groove, and the rainwater enters the wetland unit 2 in a combined way of lateral infiltration and vertical infiltration, exceeding the infiltration and storage capacity of the wetland unit 2 The rainwater is discharged from the overflow pipe 6 to the underground rainwater pipeline; wherein, when the internal liquid level of the wetland unit 2 rises to the position of the outlet 13, the rainwater purified by the wetland unit 2 is discharged to the underground rainwater pipeline through the perforated drain pipe 5.

To sum up, the working principle of the present invention is: the vegetation shallow ditch transfers surface runoff rainwater or road rainwater runoff to the rainwater grate and flows into the pre-settling chamber 1. During light rain, the rainwater runoff flow rate is smaller than that of the integrated rainwater wetland with submerged culverts for storage and purification. When the seepage and storage capacity of unit 2 is high, the rainwater enters the wetland purification unit through the perforation of the perforated partition 4, and the water flow enters the wetland unit in the form of lateral infiltration. When the liquid level rises to the position of the external outlet of the perforated discharge pipe 5 of the device, the rainwater purified by the wetland unit 2 is discharged to the underground rainwater pipe through the perforated discharge pipe 5; When the infiltration and storage capacity of the integrated rainwater wetland unit 2 is met, the rainwater not only enters the wetland purification unit 2 through the perforation of the perforated partition 4, but also overflows into the wetland purification unit 2 through the groove overflow of the top of the pre-sedimentation chamber 1 beyond the perforated partition 4, Rainwater enters the wetland unit 2 in a composite way of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland purification unit is discharged from the overflow port to the underground rainwater pipeline. When the internal liquid level of the wetland unit 2 rises to the external outlet of the perforated discharge pipe 5 of the device, the rainwater purified by the wetland unit is discharged to the underground rainwater pipeline through the perforated drainpipe.

In the above two cases, the inside of the wetland unit is in a submerged state, so that part of the rainwater runoff can be stored inside the device for the growth of wetland plants, and the stagnant part of the submerged culvert can purify the runoff rainwater and seep it into the surrounding area from the perforated plugs at both ends. Soil, which can sustainably hold groundwater after rainfall ends.

In addition, the present invention also has: 1. It can increase the infiltration of rainwater and reduce the peak value of runoff; 2. It has a large water storage capacity and reduces the volume of runoff; 3. It has good filtration and decontamination performance and can penetrate into the planting soil layer and the surrounding soil The water quality is stable; 4. After the rainfall ends, the purified rainwater can continuously replenish and conserve groundwater without polluting groundwater.

It is not difficult for those skilled in the art to understand that the integrated device and method for surface runoff rainwater storage and purification with submerged culverts of the present invention include any combination of parts in this specification. Due to space limitation and in order to make the description concise, these combinations are not introduced in detail here, but after reading this description, the scope of the present invention constituted by any combination of the parts of this description is self-evident, so no further description .

Claims (12)

1. An integrated device for surface runoff rainwater storage and purification with submerged culverts, the device includes a pre-settling chamber (1) and a wetland unit (2) placed in a box, characterized in that: the pre-settling chamber (1) There is a rainwater grate (11) on the top directly above; multiple perforated culverts (3) are arranged in the wetland unit (2); the wetland unit (2) is laid with a gravel cushion (9) and a sand filter layer (8) from bottom to top and the planting soil layer (7), the planting soil layer (7) is planted with plants (10); the gravel cushion (9) is buried in the perforated drainage pipe (5), and the outlet (13) of the perforated drainage pipe (5) is high The culvert pipe (3); the perforated drainage pipe (5) is composed of an internal perforated pipe and an external upwardly bent sealing pipe. Tube. 2. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 1, characterized in that: a perforated partition (4) is provided between the pre-sedimentation chamber (1) and the wetland unit (2). 3. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 2, characterized in that the perforated partition (4) is a concave-shaped plate with multiple perforations on its surface. 4. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 2, characterized in that: a geotextile is laid on the side of the perforated partition (4) close to the sand filter layer (8). 5. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 2, characterized in that: the height of the groove of the perforated partition (4) is lower than the top of the box; the groove of the perforated partition (4) Higher than the top of the planting soil layer (7). 6. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 1, characterized in that: the outlet (13) is flush with the top of the sand filter layer (8). 7. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 1, characterized in that: one side of the wetland unit (2) is provided with an overflow pipe (6), and the overflow pipe (6) is connected to The outlet (13) is on the same side. 8. The integrated surface runoff rainwater storage and purification device with submerged culvert pipes according to claim 7, characterized in that: the outlet bottom of the overflow pipe (6) is higher than the planting soil layer (7). 9. The integrated device for surface runoff rainwater storage and purification with submerged culvert pipes as claimed in claim 1, characterized in that: the pipe wall of the culvert pipe (3) is perforated, its outer wall is wrapped with geotextiles, and buried in the sand filter layer ( 8) Medium. 10. The integrated device for surface runoff rainwater storage and purification with submerged culvert pipes according to claim 1, characterized in that: both ends of the culvert pipe (3) go out of the box, and plugs (12) are installed at both ends. 11. The integrated device for surface runoff rainwater storage and purification with submerged culverts according to claim 10, characterized in that: the plug (12) is perforated, and its exterior is wrapped with geotextiles. 12. A method for the integration of surface runoff rainwater storage and purification, using the integrated device for surface runoff rainwater storage and purification with submerged culverts as claimed in any one of claims 1-11, characterized in that it comprises the following steps: The vegetation shallow ditch transfers surface runoff rainwater or road rainwater runoff to the rainwater grate (11) and flows into the pre-sedimentation chamber (1). When there is light rain, the rainwater runoff flow rate is less than the seepage and storage capacity of the wetland unit (2), and the rainwater passes through the perforated partition The perforation of (4) enters the wetland unit (2), and the water flow enters the wetland unit (2) through lateral infiltration; among them, the internal water flow direction of the wetland unit (2) is horizontal flow and upward flow, and the internal water flow of the wetland unit (2) The liquid level continues to rise, and when the liquid level reaches the outlet (13), the rainwater purified by the wetland unit (2) is discharged to the underground rainwater pipe through the perforated drainage pipe (5); During moderate or heavy rain, when the runoff flow of rainwater is greater than the infiltration and storage capacity of the wetland unit (2), the rainwater not only enters the wetland unit (2) through the perforations of the perforated partition (4), but also passes through the top of the pre-sedimentation chamber (1). The overflow of the groove of the perforated partition (4) enters the wetland unit (2), and the rainwater enters the wetland unit (2) through a combination of lateral infiltration and vertical infiltration, and the rainwater exceeding the infiltration and storage capacity of the wetland unit (2) flows from the overflow The flow pipe (6) is discharged to the underground rainwater pipe; among them, when the internal liquid level of the wetland unit (2) rises to the position of the outlet (13), the rainwater purified by the wetland unit (2) is discharged through the perforated drainage pipe (5) to underground storm sewers.