Urban road rainwater runoff grading interception purification and discharge device and method

Abstract

The application relates to a device and a method for grading interception, purification and discharge of urban road rainwater runoff, and belongs to the technical field of urban road drainage. The device comprises a curb opening, a variable-slope flow guide groove, a rainwater grate, an interception groove, a flow guide channel, a cyclone sewage interception area, a flow guide cylinder, an overflow grate, a biological retention zone and an overflow port. The curb opening is located on the upstream of the interception groove, the curb opening is a first interception port, and the variable-slope flow guide groove is arranged on the pavement adjacent to the curb opening. The interception groove is a second interception port and is located on the inner side of the curb. The interception groove is covered with a rainwater grate, and one end of the flow guide channel is connected to the outer side of the interception groove. The other end of the flow guide channel is connected with the cyclone sewage interception area, and the flow guide cylinder is arranged in the cyclone sewage interception area. The application can effectively control urban road rainwater runoff pollution and relieve urban road waterlogging during heavy rain.

Description

Technical Field

[0001] This invention relates to a device and method for graded interception, purification and discharge of rainwater runoff from urban roads, belonging to the field of urban road drainage technology. Background Technology

[0002] Currently, urban municipal road stormwater drainage systems mainly consist of stormwater inlets, stormwater pipes, and pumping stations. Among these, stormwater inlets, as water collection facilities, are crucial for ensuring that stormwater runoff can be discharged into the stormwater pipes. However, because stormwater runoff contains a large amount of suspended and floating debris, stormwater inlets often become clogged, affecting their flow capacity, causing road flooding, impacting traffic flow, and even leading to traffic paralysis. In addition, due to tire wear, oil leaks, and vehicle exhaust, urban road stormwater runoff is severely polluted, becoming one of the main sources of pollutants in urban water bodies. To address the aforementioned issues, various methods for delaying clogging and intercepting sewage inlets have been proposed in recent years, such as: a storm drain interception and purification device with a movably fitted sewage interceptor at the top of the drain shaft to treat rainwater (CN 219471164 U); a storm drain filtration device for municipal engineering, which prevents clogging by using a baffle with drainage holes (CN 219722092U); and a device for intercepting sewage and settling sand inside storm drains, which performs preliminary filtration of rainwater by opening drainage holes in the baffle (CN219569127 U). However, there is still a lack of methods and devices that are based on the characteristics of water volume and quality changes in urban roads, and that simultaneously prevent storm drain clogging during rainfall and control initial stormwater runoff pollution. Summary of the Invention

[0003] In view of the above-mentioned defects in the existing technology, the present invention proposes a graded interception, purification and discharge device and method for urban road rainwater runoff, which can effectively control urban road rainwater runoff pollution and alleviate the problem of urban road water accumulation during rainstorms.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A graded interception, purification, and discharge device for urban road stormwater runoff includes a curbstone opening, a variable-slope guide channel, a stormwater grate, an interception trough, a guide channel, a vortex interception zone, a guide cylinder, an overflow grate, a bioretention zone, and an overflow outlet. The curbstone opening is located upstream of the interception trough and serves as the first interception opening. A variable-slope guide channel is installed on the road surface adjacent to the curbstone opening. The interception trough is the second interception opening, located inside the curbstone. A stormwater grate covers the interception trough, and one end of the guide channel is connected to the outside of the interception trough. The other end of the guide channel is connected to the vortex interception zone.

[0006] The horizontal cross-section of the interception trough and the rainwater grate covering it are both trapezoidal in shape. The planar shape of the diversion channel is an inverted "V" shape, with its flared part connected to the lower outer side of the interception trough and its constricted part connected to the vortex interception zone.

[0007] The diversion channel and the vortex interception zone are both located outside the curb. The diversion cylinder is installed inside the vortex interception zone, and an overflow grate is installed on the top of the vortex interception zone. The vortex interception zone is connected to the overflow outlet. A bioretention zone is also installed outside the curb.

[0008] Furthermore, the structure of the bioretention zone consists of, from top to bottom, a storage layer, a planting soil layer, a filler layer, and a drainage layer. The storage layer is planted with plants to increase the retention time of rainwater and also has a certain purification function for rainwater.

[0009] Furthermore, a perforated pipe is provided below the bio-retention zone for connection to the overflow port.

[0010] Furthermore, the guide tube is composed of evenly distributed arc-shaped blades with a spacing of 1 to 2 cm. The outer ring of the guide tube can rotate, which facilitates the interception of floating objects such as leaves and branches, and can reduce blockage during rainfall.

[0011] Furthermore, the cross slope of the bottom of the variable slope diversion channel should be 3-5%, and the slope should be towards the curb side, so as to improve the interception effect of rainwater runoff on the road surface.

[0012] Furthermore, the length of the curb opening should be 50-80cm. Rainwater enters the bioretention zone through the curb opening. The height difference between the curb opening and the surface of the bioretention zone should be 10-30cm to achieve the effect of retaining and purifying the initial runoff rainwater.

[0013] Furthermore, the long side of the rain grate is closer to the curb, and the short side is closer to the middle of the road.

[0014] Furthermore, the diversion channel and the vortex interception zone are tangentially connected.

[0015] Furthermore, the vortex interception zone is cylindrical, and the guide tube is placed at the center of the vortex interception zone.

[0016] A method for graded interception, purification, and discharge of urban road stormwater runoff, employing the aforementioned urban road stormwater runoff graded interception, purification, and discharge device, includes the following steps: In the initial stage of rainfall, rainwater flows through curb openings into a bioretention zone; later, rainwater flows through stormwater grates covering the interception trough and ultimately into a vortex interception zone; wherein, rainwater passes through the interception trough and enters a lower diversion channel, the diversion channel having an inverted "V" shape. As the cross-sectional area of ​​the diversion channel decreases and the elevation difference increases, the flow velocity of the rainwater increases, accelerating the flow of rainwater from the diversion channel. Upon entering the vortex interception zone, the diversion channel is tangentially connected to the vortex interception zone to reduce rainwater head loss. Rainwater forms a vortex under the action of the diversion tube, which also rotates the tube to prevent floating debris such as leaves and branches from clogging it. Afterward, the rainwater in the diversion tube is discharged into the municipal pipeline through the overflow outlet. In addition, a perforated pipe is installed below the bioretention zone and connected to the overflow outlet. When the rainwater flow exceeds the carrying capacity of the bioretention zone, some rainwater flows into the overflow outlet through the overflow grate covering the vortex interception zone and is eventually discharged into the municipal pipeline.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] (1) The present invention adopts a graded interception and discharge of rainwater runoff. The curb opening is the first interception opening, and a variable slope diversion channel is set on the road surface adjacent to the curb opening. In the early stage of rainfall, rainwater is discharged into the bioretention zone through the curb opening. A perforated pipe is set below the bioretention zone and connected to the overflow outlet. The interception channel is the second interception opening. In the later stage, rainwater flows into the overflow outlet through the rainwater grate covering the interception channel and finally flows into the municipal pipeline.

[0019] (2) The rain grate covering the interception trough is designed based on the velocity distribution of rainwater runoff in the cross section of the road. Since the water flow velocity is greater on the side near the curb, the required interception path is relatively long. The water flow velocity is smaller on the side near the middle of the road, the required interception path is relatively short. Based on the above velocity characteristics, a trapezoidal rain grate is proposed, with the long side near the curb and the short side near the middle of the road.

[0020] (3) The plan shape of the diversion channel is an inverted "V" shape. As the cross-sectional area decreases and the height difference increases, the rainwater enters the vortex interception zone at an accelerated rate. The diversion channel is tangentially connected to the vortex interception zone to reduce the head loss of the rainwater. Under the action of the diversion cylinder, a vortex is formed, and the diversion cylinder rotates.

[0021] (4) A guide tube with interception function is installed in the vortex interception zone. When rainwater enters the vortex interception zone, it forms a vortex and intercepts tree branches and other debris to prevent blockage. An overflow grate is installed on the vortex interception zone. When the rainwater flow exceeds the carrying capacity of the bioretention zone, some rainwater flows into the overflow grate and is eventually discharged into the municipal pipeline. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a graded interception, purification and discharge device for urban road stormwater runoff according to an embodiment of the present invention;

[0023] Figure 2 This is a side view of a graded interception, purification and discharge device for urban road stormwater runoff according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a drainage method for a diversion channel according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the guide tube structure according to an embodiment of the present invention;

[0026] Figure 5 The present invention is a schematic diagram of a rain grate in an embodiment of the present invention, wherein (a) is a schematic diagram of a cross-section of a roadside ditch; (b) is a diagram of the flow velocity distribution of rainwater runoff in a roadside ditch; and (c) is a schematic diagram of a rain grate. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-5 The present invention will be further described in detail below to facilitate a clear understanding of the invention, but these descriptions do not constitute a limitation thereof.

[0028] As attached Figure 1-5 As shown, this embodiment of a graded interception, purification, and discharge device for urban road stormwater runoff includes a curb opening 1, a slope-changing guide channel 2, a stormwater grate 3, an interception channel 4, a guide ditch 5, a vortex interception zone 6, a guide cylinder 7, an overflow grate 8, a bioretention zone 9, and an overflow outlet 10. Figure 1 As shown, the curbstone opening 1 is located upstream of the interception trough 4. The curbstone opening 1 is the first interception opening, and a variable slope guide trough 2 is set on the road surface adjacent to the curbstone opening 1. In this embodiment, the cross slope of the bottom of the variable slope guide trough 2 is 4%, and it slopes towards the curbstone side, thereby improving the interception effect of rainwater runoff on the road surface. The interception trough 4 is the second interception opening, located inside the curbstone. The interception trough 4 is covered with a rainwater grate 3. One end of the guide channel 5 is connected to the outside of the interception trough 4, and the other end of the guide channel 5 is connected to a vortex interception zone 6.

[0029] The horizontal cross-section of the interception trough 4 and the rainwater grate 3 covering it are both trapezoidal in shape. The longer side of the rainwater grate 3 is closer to the curb, and the shorter side is closer to the middle of the road. The horizontal cross-section of the interception trough 4 and the rainwater grate 3 covering it are designed based on the velocity distribution of rainwater runoff across the road cross-section. Because the water flow velocity V1 is higher near the curb, the required interception path is relatively longer, while the water flow velocity V2 is lower near the middle of the road, resulting in a relatively shorter interception path. Based on these velocity characteristics, a trapezoidal rainwater grate 3 is proposed, such as... Figure 5As shown.

[0030] The diversion channel 5 has an inverted "V" shape in plan. Its flared part is connected to the lower outer part of the interception channel 4, and its constricted part is connected to the vortex interception zone 6.

[0031] In this embodiment, as Figure 3 As shown, both the diversion channel 5 and the vortex interception zone 6 are located outside the curb, and are tangentially connected. A guide cylinder 7 is installed within the vortex interception zone 6, which is cylindrical in shape, with the guide cylinder 7 positioned at its center. The guide cylinder 7 consists of evenly distributed arc-shaped blades 71, spaced approximately 1 cm apart. The outer ring of the guide cylinder 7 is rotatable, facilitating the interception of floating debris such as leaves and branches, and mitigating blockage during rainfall. Figure 4 As shown.

[0032] The vortex interception zone 6 is connected to the overflow outlet 10, and an overflow grate 8 is installed on top of the vortex interception zone 6. A bioretention strip 9 is also installed on the outer side of the curb. Figure 2 As shown, the soil layers of the bioretention zone 9, from top to bottom, are a storage layer 91, a planting soil layer 92, a filler layer 93, and a drainage layer 94. Plants are planted on the storage layer 91 to increase the retention time of rainwater and to provide some purification. A perforated pipe is installed below the bioretention zone 9 to connect to the overflow outlet 10.

[0033] In this embodiment, the curb opening 1 is 60cm long, and rainwater enters the bioretention zone 9 through the curb opening 1. The height difference between the curb opening 1 and the bioretention zone 9 is 20cm, so as to achieve the effect of retaining and purifying the initial runoff rainwater.

[0034] The aforementioned method for graded interception, purification, and discharge of urban road stormwater runoff includes the following steps: Initially, rainwater flows through the curbstone opening 1 into the bioretention zone 9. Later, rainwater flows through the storm drain grates 3 covering the interception trough 4 and ultimately into the vortex interception zone 6. Rainwater passes through the interception trough 4 and enters the downstream diversion channel 5. The diversion channel 5 has an inverted "V" shape. As the cross-sectional area of ​​the diversion channel 5 decreases and the elevation difference increases, the flow velocity of the rainwater increases, accelerating its entry into the vortex interception zone 6. The diversion channel 5 and the vortex interception zone 6 are tangentially connected to reduce head loss. Rainwater forms a vortex under the action of the diversion cylinder 7, which also rotates, preventing floating debris such as leaves and branches from clogging the diversion cylinder 7. Finally, the rainwater in the diversion cylinder 7 is discharged into the municipal pipeline through the overflow outlet 10. In addition, a perforated pipe is installed below the bioretention zone 9 and connected to the overflow outlet 10. When the rainwater flow exceeds the carrying capacity of the bioretention zone 9, some rainwater flows into the overflow outlet 10 through the overflow grate 8 covering the vortex interception zone 6 and is eventually discharged into the municipal pipeline.

[0035] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the structure of the present invention. The arrangement and quantity of the present invention are not limited to this example and can be optimized according to actual engineering conditions. Any modifications, equivalent changes, and decorations made to the above embodiments based on the technical principles of the present invention, without departing from the scope of the present invention, are still within the scope of the present invention.

Claims

1. A graded interception, purification, and discharge device for urban road stormwater runoff, characterized in that: It includes a curbstone opening (1), a variable slope guide channel (2), a rainwater grate (3), an interception channel (4), a guide channel (5), a vortex interception zone (6), a guide cylinder (7), an overflow grate (8), a bioretention zone (9), and an overflow outlet (10); wherein, the curbstone opening (1) is located upstream of the interception channel (4), the curbstone opening (1) is the first interception opening, and a variable slope guide channel (2) is set on the road surface adjacent to the curbstone opening (1); the interception channel (4) is the second interception opening, located inside the curbstone, the interception channel (4) is covered with a rainwater grate (3), one end of the guide channel (5) is connected to the outside of the interception channel (4), and the other end of the guide channel (5) is connected to the vortex interception zone (6); The horizontal cross section of the interception trough (4) and the rainwater grate (3) covering it are both trapezoidal in shape. The planar shape of the diversion channel (5) is an inverted "V" shape. Its flared part is connected to the lower part of the outer side of the interception trough (4), and its constricted part is connected to the vortex interception zone (6). The diversion channel (5) and the vortex interception zone (6) are both located outside the curbstone. The diversion tube (7) is installed inside the vortex interception zone (6). The vortex interception zone (6) is connected to the overflow port (10). An overflow grate (8) is installed on the top of the vortex interception zone (6). A bioretention zone (9) is also installed outside the curbstone. The guide tube (7) is composed of evenly distributed arc-shaped blades (71) with a spacing of 1~2cm. The outer ring of the guide tube (7) can rotate, which is convenient for intercepting floating leaves and branches, and can reduce its blockage during rainfall. The slope of the bottom of the variable slope diversion channel (2) is 3~5%, and the slope is towards the curb, thereby improving the interception effect of rainwater runoff on the road surface; The length of the curb opening (1) is 50~80cm. Rainwater enters the bioretention zone (9) through the curb opening (1). The height difference between the curb opening (1) and the bioretention zone (9) is 10~30cm.

2. The urban road stormwater runoff graded interception, purification, and discharge device according to claim 1, characterized in that: The structure of the bioretention zone (9) consists of a storage layer (91), a planting soil layer (92), a filler layer (93), and a drainage layer (94) from top to bottom. The storage layer (91) is planted with plants to increase the retention time of rainwater and also has a certain purification function for rainwater.

3. The urban road stormwater runoff graded interception, purification, and discharge device according to claim 2, characterized in that: A perforated pipe is provided below the bio-retention zone (9) for connecting to the overflow port (10).

4. The urban road stormwater runoff graded interception, purification and discharge device according to claim 1, characterized in that: The rain grate (3) has its long side close to the curb and its short side close to the middle of the road.

5. A graded interception, purification, and discharge device for urban road stormwater runoff according to any one of claims 1-4, characterized in that: The diversion channel (5) and the vortex interception zone (6) are tangentially connected.

6. The urban road stormwater runoff graded interception, purification, and discharge device according to claim 5, characterized in that: The swirling interception zone (6) is cylindrical and located above the overflow port (10), with the guide tube (7) placed in the center of the swirling interception zone (6).

7. A method for graded interception, purification, and discharge of urban road stormwater runoff, comprising using the urban road stormwater runoff graded interception, purification, and discharge device as described in any one of claims 1-6, characterized in that, The process includes the following steps: In the early stages of rainfall, rainwater flows through the curbstone opening (1) into the bioretention zone (9); in the later stages, rainwater flows through the rainwater grate (3) covering the interception trough (4) and finally into the vortex interception zone (6); rainwater passes through the interception trough (4) and enters the diversion channel (5) below. The diversion channel (5) adopts an inverted "V" shape. As the cross-sectional area of ​​the diversion channel (5) decreases and the elevation difference increases, the flow velocity of the rainwater increases, and the rainwater accelerates from the diversion channel (5) into the vortex interception zone (6). The diversion channel (5) and the vortex interception zone (6) are tangentially connected to reduce the impact of rainfall. Rainwater head loss; rainwater forms a vortex under the action of the diversion tube (7), and at the same time makes the diversion tube (7) rotate, preventing leaves and branches floating in the rainwater from clogging the diversion tube (7); then the rainwater in the diversion tube (7) is discharged into the municipal pipeline through the overflow port (10); in addition, a perforated pipe is set below the bioretention zone (9) and connected to the overflow port (10). When the rainwater flow is large and exceeds the retention capacity of the bioretention zone (9), some rainwater flows into the overflow port (10) through the overflow grate (8) covering the vortex interception zone (6) and is finally discharged into the municipal pipeline.

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