Urban road rainwater runoff pollution control device and control method thereof

Abstract

The application discloses a kind of urban road rainwater runoff pollution control equipment and control method thereof, it is related to rainwater runoff pollution control technical field, is a kind of technology suitable for road initial rainwater diversion and rainwater runoff pollution control.The urban road rainwater runoff pollution control equipment of the application includes gate chamber, transmission device, initial rainwater diversion chamber, flow guide pipe and sand box, transmission device can realize the automatic opening and closing of two gates, controls initial rainwater and middle and late rainwater from different import to flow into gate chamber.Compared with traditional rainwater well, the application can realize the automatic source control of rainwater well mouth and intercepts sewage, and the initial rainwater with poor water quality of urban road is discharged into municipal sewage pipeline, and the middle and late rainwater is discharged into municipal rainwater pipeline, which is beneficial to the improvement of urban black and odorous water body and urban water environment, and has significant environmental and social benefits, and has wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater and sewage separation in municipal engineering, and in particular to a pollution control device for rainwater runoff on urban roads and a control method thereof. Background Art

[0002] As my country's urbanization rate continues to increase, the area of ​​impervious surfaces continues to increase. Pavement is an important component of urban impervious subsurfaces. Due to the scouring effect of rainwater, pollutants accumulated on the road surface will enter the rainwater runoff, resulting in a high concentration of pollutants in the initial rainwater runoff of the road surface. At the same time, the rainwater runoff carries a large amount of garbage. This rainwater runoff directly discharged into the municipal pipe network will increase the pollution load of the municipal pipe network and sewage treatment plants, and clog the municipal pipe network. When the rainfall is heavy, overflow is likely to occur, exacerbating urban water pollution. Discharge of initial rainwater from the road surface is a key measure to achieve source control and sewage interception of urban black and odorous water bodies. It has important environmental and social benefits for controlling non-point source pollution of urban water bodies and improving the urban water environment. Summary of the Invention

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide an urban road rainwater runoff pollution control device and a control method thereof, so as to overcome the defects of the existing vertical grate type rainwater well that it is difficult to automatically discard the initially dirty rainwater runoff and the drainage pipe has a large pollution load, thereby improving the drainage efficiency and the water quality of the rainwater flowing into the pipe network, reducing the pollution load of the municipal rainwater pipe network, and protecting the urban water environment.

[0004] Technical solution: The present invention solves the technical problem by providing an urban road rainwater runoff pollution control device, which includes a gate chamber, a transmission device, an initial rainwater diversion chamber, a diversion pipe and a sand settling box, and is characterized by:

[0005] The lock chamber is composed of a gate A, an initial rainwater inlet, a mid-to-late rainwater inlet, a manhole cover, a grille, a gate B and a float. The initial rainwater inlet and the mid-to-late rainwater inlet are both water inlets of the lock chamber. The initial rainwater inlet is connected to the grille, and the mid-to-late rainwater inlet is connected to the vertical grate rainwater outlet. The vertical grate rainwater outlet and the grille are arranged vertically side by side with the curb of the driveway. The gate A blocks the mid-to-late rainwater inlet. When the gate B is open, it is located directly below the grille. When the gate B is closed, it forms a whole with the grille and blocks the initial rainwater inlet. The float is connected to the lower end of the gate B, and the manhole cover is covered on the top of the lock chamber.

[0006] The transmission device consists of an inspection cover, a gear, a rack and a slide. The transmission device is vertically installed between gate A and gate B. The inspection cover is located at the top of the transmission device, the gear is located in the middle of the transmission device, the gear is installed on the rotating shaft, the rack is installed on the side of gate A and gate B close to the gear, and the slide is vertically and parallelly fixed to the left and right inner sides of the urban road rainwater runoff pollution control device. The slide is located on both sides of gate A and gate B and acts as a gate slot. When gate B is opened and closed, the rack on the side of gate B can engage the gear to rotate, and the gear rotates to engage the rack on the side of gate A and drive gate A to move. At the same time, the rotation of the gear can engage the rack on the side of gate A to move, thereby driving gate A to move;

[0007] The initial rainwater diversion chamber is located below the initial rainwater inlet. A discharge hole connected to a sewage pipe is provided at the bottom of the initial rainwater diversion chamber. A float frame is provided on the inner wall of the initial rainwater diversion chamber. The sewage pipe consists of a vertical section and a horizontal section. The discharge hole is connected to the horizontal section of the sewage pipe. The vertical section of the sewage pipe is connected to the municipal sewage pipe. A check valve is installed at the end of the vertical section of the sewage pipe.

[0008] The diversion pipe consists of a vertical section and a horizontal section. The upper end of the vertical section is provided with two water inlet pipes connected to the initial rainwater inlet and the middle and late rainwater inlet respectively. The horizontal section is connected to the sewage pipe connected to the discharge hole. The horizontal section is provided with a water stop plug, and the middle part of the horizontal section is also connected to the sewage pipe through a bypass pipe.

[0009] The sand settling chamber is located in the initial rainwater diversion chamber, the bottom of the sand settling chamber is a sand settling box, the water outlet of the sand settling box is provided with an overflow weir, and the sand settling box is connected to the bottom of the manhole cover through a traction rope.

[0010] One end of the drainage pipe is connected to the mid- and late-stage rainwater inlet, and the other end is connected to the municipal rainwater pipeline.

[0011] The middle and late rainwater inlet is provided with a gate A. When there is no rainfall, the gate A is in a closed state to prevent road garbage from flowing into the middle and late rainwater inlet.

[0012] The gate A and gate B are driven by a gear and rack, and gate A rises while gate B falls.

[0013] The vertical section of the diversion pipe is a "Y"-shaped pipe, and the two water inlet openings are respectively connected to the initial rainwater inlet and the mid-to-late rainwater inlet. During rainfall, rainfall runoff can always flow into the diversion pipe.

[0014] The mass of the gate B is greater than that of the gate A. Under the action of gravity, the gate B falls freely.

[0015] In the application, the slit shape of the grid is a regular quadrangular pyramid. The shape of the gate B is a plurality of regular quadrangular pyramids connected in parallel and provided with grooves on the side surfaces. When the gate B rises to the highest point, it is just inlaid with the grid to make the gate B reach the closed state.

[0016] In the application, the shape of the water stop plug is a sphere. The diameter of the water stop plug is slightly smaller than the diameter of the flow guide pipe and larger than the diameter of the sewage pipe. The diameter of the flow guide pipe is larger than the diameter of the sewage pipe. When it rains, the rainwater in the flow guide pipe impacts and pushes the water stop plug to block the discharge hole.

[0017] In the application, the mass of the gate B is larger than the mass of the gate A. Under the action of gravity, the gate B can freely descend.

[0018] As preferred, the gate A is provided in the middle-late stage rainwater inlet. When there is no rain, the gate A is in the closed state, and the road surface garbage cannot flow into the middle-late stage rainwater inlet.

[0019] As preferred, the gate A rises while the gate B descends. The gate B rises while the gate A descends.

[0020] As preferred, the overflow weir divides the bottom of the early stage rainwater diversion chamber into two parts. The part close to the early stage rainwater inlet is provided with a sand trap, and the other part is provided with a discharge hole.

[0021] As preferred, the sewage pipe is provided with a check valve at the end to prevent sewage from flowing back.

[0022] As preferred, the slit of the grid and the slit of the gate B are both regular quadrangular pyramids. The edge of each regular quadrangular pyramid of the gate B is provided with a groove. When the gate B does not rise to the highest point, the early stage rainwater inlet can still flow freely. After the gate B rises to the highest point, the groove can be inlaid with the grid to make the gate B reach the closed state.

[0023] As preferred, the flow guide pipe is composed of a vertical section and a horizontal section. The vertical section of the flow guide pipe is a “Y” type pipe. The vertical section is provided with two water inlets. The two water inlets are respectively connected with the early stage rainwater inlet and the middle-late stage rainwater inlet. The horizontal section is provided with a water stop plug.

[0024] As preferred, the diameter of the discharge hole and the diameter of the sewage pipe are both smaller than the diameter of the water stop plug. When it rains, the rainwater in the flow guide pipe impacts and pushes the water stop plug to block the discharge hole.

[0025] The technical scheme provided by the application further includes a control method of the urban road rainwater runoff pollution control equipment, characterized by comprising the following steps:

[0026] ① When there is no rain, the equipment is in the initial state. At this time, the gate A is closed, the gate B is opened, the water stop plug is away from the discharge hole, and the sand trap is located at the bottom of the early stage rainwater diversion chamber.

[0027] ② After rainfall, initial rainwater flows from the road into the initial rainwater diversion chamber through the initial rainwater inlet, where sediment begins to settle in the sand settling box. Simultaneously, some road water flows into the diversion pipe at the initial rainwater inlet, while a smaller portion flows into the drainage pipe through the bypass pipe. The bypass pipe has a much smaller diameter than the diversion pipe, so the rainwater in the diversion pipe gradually impacts and pushes the water stop plug to seal the drainage hole.

[0028] ③ As the rainfall continues, the rainwater overflows the overflow weir and the water level in the initial rainwater diversion chamber continues to rise. When the water level in the initial rainwater diversion chamber exceeds the bottom of the float, the float pushes gate B up along the chute under the action of the buoyancy of the rainwater.

[0029] ④ When gate B rises, the rack on the side of gate B engages the gear to rotate counterclockwise. After the gear rotates, it drives the rack on the side of gate A to move downward, thereby driving gate A to open downward.

[0030] ⑤ When Gate B reaches its highest point, it seamlessly connects with the grille, closing it. Rainwater then flows through the mid- and late-stage rainwater inlets into the drainpipe, where it flows into the municipal stormwater pipeline. Simultaneously, some road rainwater flows into the diversion pipe at the mid- and late-stage rainwater inlets, maintaining water pressure in the diversion pipe. The water stopper continuously seals the drain hole, and the buoy continuously pushes Gate B, keeping it closed.

[0031] ⑥ After the rainfall stops, the rainwater in the diversion pipe continues to decrease, and the water stopper retreats to the diversion pipe away from the discharge hole under the action of the rainwater pressure in the initial rainwater diversion chamber. The rainwater in the initial rainwater diversion chamber flows into the municipal sewage pipe through the discharge hole and the sewage pipe.

[0032] ⑦ As the water level in the initial rainwater diversion chamber drops, the buoyancy of the float gradually decreases. Gate B begins to open downward under the action of gravity and drives Gate A upward through the transmission device until it closes. After the initial rainwater diversion chamber is emptied, the manhole cover is opened and the sand settling box is lifted out of the wellhead using a tow rope for cleaning. After cleaning, it is returned to the bottom of the initial rainwater diversion chamber, and the equipment is restored to its initial state.

[0033] By following the corresponding steps above, the process of controlling road rainwater runoff pollution can be achieved.

[0034] Beneficial effects: The urban road rainwater runoff pollution control device and control method thereof of the present invention have the following beneficial effects:

[0035] (1) Gate A and gate B in the present invention are connected by a gear and a rack. In the initial state, gate B is open and gate A is closed, and the initial rainwater flows into the initial rainwater inlet. Under the action of buoyancy, the float drives gate B to rise, and the rack on gate B drives the gear to rotate. The gear drives gate A to descend through the rack. When gate B rises to the highest point, gate A is fully opened, and the middle and late rainwater flows into the rainwater pipe through the middle and late rainwater inlet and the drainage pipe, realizing the automatic diversion of the initial rainwater runoff and the middle and late rainwater runoff.

[0036] (2) The water stopper of the present invention is spherical in shape. The diameter of the water stopper is slightly smaller than the diameter of the diversion pipe but larger than the diameter of the sewage pipe. The diameter of the diversion pipe is larger than the diameter of the sewage pipe. Before the water stopper seals the discharge hole, when water is present in both the diversion pipe and the initial rainwater diversion chamber, the water pressure in the diversion pipe applied to the water stopper is greater than the water pressure in the initial rainwater diversion chamber, which facilitates the water stopper to seal the discharge hole in a timely manner. During rainfall, regardless of whether rainwater flows in from the initial rainwater inlet or from the mid- and late-stage rainwater inlet, rainfall runoff can always flow into the diversion pipe, ensuring that the water stopper can seal the discharge hole during rainfall.

[0037] (3) In the present invention, during rainfall, the water stopper moves to the bottom of the discharge hole under the action of the water pressure in the diversion pipe, closes the discharge hole, and causes the gate B to gradually open and remain closed under the action of the buoyancy of the float. After the rainfall is over, the water in the diversion pipe is gradually discharged through the bypass pipe, and the water stopper is separated from the discharge hole under the action of the water pressure in the initial rainwater diversion chamber. Only then does the initial rainwater flow into the sewage pipe through the discharge hole and the sewage pipe. Before the water stopper is separated from the discharge hole, it is beneficial for the sediment in the initial rainwater diversion chamber to fully settle in the sand settling box. The water stopper can automatically close the discharge hole of the initial rainwater diversion chamber during rainfall, and automatically open after the rainfall is over, so as to achieve the purpose of storing the initial rainwater first and then discharging it. The operation process of the entire equipment is green and environmentally friendly.

[0038] (4) In the present invention, a sand settling box is provided in the initial rainwater diversion chamber, which can avoid pipe network blockage and can also effectively remove pollutants in the initial rainwater by utilizing the adsorption effect of sediment on pollutants, thereby reducing the pollution load of the sewage treatment plant.

[0039] (5) In the present invention, an overflow weir is provided on the water outlet side of the sand settling box to buffer the water flow, which is conducive to the sedimentation of particulate matter in the sand settling box.

[0040] (6) In the present invention, a gate A is provided at the middle and late rainwater inlet. When there is no rainfall, the gate A is closed, which can effectively prevent road garbage from flowing into the vertical grate type rainwater well. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of an urban road rainwater runoff pollution control device of the present invention;

[0042] Figure 2 It is a three-dimensional diagram of an urban road rainwater runoff pollution control device of the present invention;

[0043] Figure 3 It is a structural diagram of gate B;

[0044] Figure 4 It is a structural diagram of the grit chamber;

[0045] Figure 5 It is a schematic diagram of the diversion pipe and sewage pipe structure.

[0046] In the figure: 1- lock chamber; 11- gate A; 12- initial rainwater inlet; 13- middle and late rainwater inlet; 14- manhole cover; 15- grille; 16- gate B; 17- float; 18- vertical grate rainwater inlet; 2- transmission device; 21- inspection port cover; 22- gear; 23- rack; 24- chute; 3- initial rainwater diversion chamber; 31- discharge hole; 32- drain pipe; 33- check valve; 8- sewage pipe; 34- float frame; 4- diversion pipe; 41- water stop; 42- bypass pipe; 5- sand settling chamber; 51- overflow weir; 52- sand settling box; 53- traction rope; 6- drain pipe; 7- rainwater pipe. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] like Figures 1 to 5 As shown, the present invention provides a pollution control device for urban road rainwater runoff, comprising a gate chamber 1, a transmission device 2, an initial rainwater diversion chamber 3, a diversion pipe 4, and a sand settling chamber 5. The gate chamber 1 is embedded in the curb adjacent to the roadway, with a manhole cover 14 affixed to the top. The gate chamber 1 itself includes a gate A11, an initial rainwater inlet 12, a mid- and late-stage rainwater inlet 13, a manhole cover 14, a grille 15, a gate B16, and a float 17. The water inlet of the gate chamber 1 is divided into an initial rainwater inlet 12 and a mid- and late-stage rainwater inlet 13. The initial rainwater inlet 12 communicates with the grille 15, while the mid- and late-stage rainwater inlet 13 communicates with a vertical grate-type rainwater outlet 18. Both the vertical grate-type rainwater outlet 18 and the grille 15 are arranged vertically alongside the roadway curb. The grille 15 is constructed from multiple inverted, parallel-connected regular square pyramids, while the gate B16 is constructed from multiple parallel-connected regular square pyramids with grooves on their sides. The middle and late rainwater inlet 13 is provided with a gate A11. When there is no rainfall, the gate A11 blocks the middle and late rainwater inlet 13. The gate A11 is in a closed state, which can prevent road garbage from flowing into the middle and late rainwater inlet 13.

[0049] When gate B16 is open, it is located directly below grille 15. When closed, gate B16 and grille 15 form a single unit, sealing the initial rainwater inlet 12. Float 17 is connected to the lower end of gate B16, and manhole cover 14 covers the top of gate chamber 1. Transmission device 2 consists of an inspection hatch 21, a gear 22, a rack 23, and a chute 24. Transmission device 2 is vertically mounted between gates A11 and B16. Inspection hatch 21 is located at the top of transmission device 2, while gear 22 and rack 23 are located below inspection hatch 21. Gear 22 is located in the middle of transmission device 2, mounted on a rotating shaft, and rack 23 is mounted on the side of gates A11 and B16 near gear 22. Chute 24 is vertically and parallelly fixed to the left and right inner side surfaces of the urban road rainwater runoff pollution control device. Chute 24 is located on either side of gates A11 and B16, acting as a gate slot.

[0050] The initial rainwater diversion chamber 3 is located below the initial rainwater inlet 12, and the discharge hole 31 is located at the bottom of the initial rainwater diversion chamber 3. The discharge hole 31 is connected to the sewage pipe 32, and the sewage pipe 32 is connected to the sewage pipe 8. The check valve 33 is installed at the end of the sewage pipe 32. The float frame 34 is located on the inner wall of the initial rainwater diversion chamber 3. Two pipe openings are provided on the upper part of the diversion pipe 4. The pipe opening A is connected to the side of the middle and late rainwater inlet 13 close to the road surface, and the pipe opening B is connected to the side of the initial rainwater inlet 12 close to the road surface. The water stop plug 41 is located in the horizontal part of the diversion pipe 4, and the bypass pipe 42 connects the horizontal part of the diversion pipe 4 and the vertical part of the sewage pipe 32. The sand settling chamber 5 is located in the initial rainwater diversion chamber 3. The bottom of the sand settling chamber 5 is a sand settling box 52. The water outlet side of the sand settling box 52 is provided with an overflow weir 51. The traction rope 53 connects the sand settling box 52 and the manhole cover 14. One end of the drainage pipe 6 is connected to the middle and late rainwater inlet 13, and the other end is connected to the rainwater pipe 7.

[0051] like Figure 1 and Figure 3As shown in the figures, the front view of the gate B16 is a triangular grid, and the gate B16 is provided with a groove on both sides. When the gate B16 rises to the highest point, the groove can just embed the grid 15, and the gate B16 reaches the closed state. When the gate B16 is opened and closed, the rack 23 on the side of the gate B16 can engage the gear 22 to rotate, and the gear 22 rotates to engage the rack 23 on the side of the gate A11 and drive the gate A11 to move. The initial rainwater diversion chamber 3 is located below the initial rainwater inlet 12, and the bottom of the initial rainwater diversion chamber 3 is provided with a discharge hole 31 connected with the sewage pipe 32. The inner side wall of the initial rainwater diversion chamber 3 is provided with a float bracket 34. The sewage pipe 32 is composed of a vertical section and a horizontal section. The discharge hole 31 is connected with the horizontal section of the sewage pipe 32. The vertical section of the sewage pipe 32 is connected with the municipal sewage pipeline 8. The vertical section of the sewage pipe 32 is provided with a check valve 33.

[0052] As shown in the figures, Figure 1 and Figure 4 The sand chamber 5 is located in the initial rainwater diversion chamber 3. The bottom of the sand chamber 5 is a sand tank 52. The overflow weir 51 is arranged at the water outlet of the sand tank 52. The sand tank 52 is connected with the bottom of the inspection well cover 14 through the traction rope 53. One end of the drain pipe 6 is connected with the middle and late rainwater inlet 13, and the other end is connected with the municipal rainwater pipeline 7.

[0053] As shown in the figures, Figure 1 and Figure 5 The upper part of the flow guide pipe 4 is provided with two pipe openings. The water stop plug 41 is located in the horizontal section of the flow guide pipe 4. The bypass pipe 42 connects the horizontal section of the flow guide pipe 4 and the vertical section of the sewage pipe 32. The check valve 33 is installed at the end of the sewage pipe 32. The diameter of the flow guide pipe 4 is larger than the diameter of the sewage pipe 32.

[0054] In this embodiment, the weight of the gate B16 is about 1.5 times the weight of the gate A11.

[0055] In this embodiment, the shape of the water stop plug 41 is spherical. The diameter of the discharge hole 31 is equal to the radius of the water stop plug 41. The diameter of the water stop plug 41 is slightly smaller than the diameter of the flow guide pipe 4 and larger than the diameter of the sewage pipe 32. When it rains, the rainwater in the flow guide pipe 4 impacts and pushes the water stop plug 41 to block the discharge hole 31.

[0056] The control method of the urban road rainwater runoff pollution control equipment in this embodiment includes the following steps:

[0057] ① When there is no rainfall, the equipment is in the initial state. At this time, gate A11 is closed, gate B16 is open, the water stopper 41 is away from the discharge hole 31, and the sand settling chamber 5 is located at the bottom of the initial rainwater diversion chamber 3.

[0058] ② After rainfall, initial rainwater flows from the road into the initial rainwater diversion chamber 3 through the initial rainwater inlet 12, where sediment begins to settle in the sand settling box 52. Simultaneously, some rainwater flows into the diversion pipe 4 at the initial rainwater inlet 12, while a smaller portion flows into the drainage pipe 32 through the bypass pipe 42. The diameter of the bypass pipe 42 is much smaller than that of the diversion pipe 4. As a result, the rainwater in the diversion pipe 4 gradually impacts and pushes the water stopper 41 to seal the drainage hole 31.

[0059] ③ As the rainfall continues, the rainwater overflows the overflow weir 51, and the water level in the initial rainwater diversion chamber 3 continues to rise. When the water level in the initial rainwater diversion chamber 3 exceeds the bottom of the float 17, the float 17 pushes the gate B16 up along the chute 24 under the action of the buoyancy of the rainwater.

[0060] ④ When gate B16 rises, the rack 23 on the side of gate B16 engages the gear 22 and rotates counterclockwise. After the gear 22 rotates, it drives the rack 23 on the side of gate A11 to move downward, thereby driving gate A11 to open downward.

[0061] ⑤ When gate B16 reaches its highest point, it seamlessly connects with grille 15, closing it. Rainwater then flows through mid- and late-stage rainwater inlet 13 into drain pipe 6, where it flows into municipal stormwater pipe 7. Simultaneously, some road rainwater flows through mid- and late-stage rainwater inlet 13 into diversion pipe 4. To maintain water pressure in diversion pipe 4, water stopper 41 continuously blocks drain hole 31, and float 17 continuously pushes gate B16, keeping it closed.

[0062] ⑥ After the rainfall stops, the rainwater in the diversion pipe 4 continues to decrease, and the water stopper 41 retreats to the diversion pipe 4 away from the discharge hole 31 under the action of the rainwater pressure in the initial rainwater diversion chamber 3. The initial rainwater in the initial rainwater diversion chamber 3 flows into the municipal sewage pipe 8 through the discharge hole 31 and the sewage pipe 32.

[0063] ⑦ As the water level in initial rainwater diversion chamber 3 drops, the buoyancy of float 17 gradually decreases. Gate B16 begins to open downward under the action of gravity and drives gate A11 upward through the transmission device until it closes. After initial rainwater diversion chamber 3 is emptied, the manhole cover 14 is opened, and the sand box 52 is lifted out of the wellhead using the tow rope 53 for cleaning. After cleaning, it is returned to the bottom of initial rainwater diversion chamber 3, and the equipment returns to its initial state.

[0064] Follow the corresponding steps above to achieve the control process of road rainwater runoff pollution.

[0065] The above content is merely an example and explanation of the present invention. For those skilled in the art, without departing from the principles and basic features of the present invention, several improvements and modifications can be made, and the present invention can be implemented in other specific forms. Obviously, the present invention is not limited to the details of the above exemplary embodiments, and improvements and modifications related thereto should also be regarded as the scope of protection of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and therefore all changes that fall within the meaning and scope of the equivalent elements of the claims should be included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. An urban road rainwater runoff pollution control device, comprising a gate chamber (1), a transmission device (2), an initial rainwater diversion chamber (3), a diversion pipe (4) and a grit chamber (5), characterized in that: The lock chamber (1) is composed of a gate A (11), an initial rainwater inlet (12), a mid-to-late rainwater inlet (13), a manhole cover (14), a grille (15), a gate B (16) and a float (17). The initial rainwater inlet (12) and the mid-to-late rainwater inlet (13) are both water inlets of the lock chamber (1). The initial rainwater inlet (12) is connected to the grille (15), and the mid-to-late rainwater inlet (13) is connected to the vertical grate type rainwater outlet (18). The vertical grate type rainwater inlet (18) and the grille (15) are arranged vertically side by side with the curbstone of the roadway. The gate A (11) blocks the mid- and late-stage rainwater inlet (13). When the gate B (16) is opened, it is located directly below the grille (15). When the gate B (16) is closed, it forms a whole with the grille (15) and blocks the initial rainwater inlet (12). The buoy (17) is connected to the lower end of the gate B (16). The manhole cover (14) covers the top of the gate chamber (1). The transmission device (2) is composed of an inspection cover plate (21), a gear (22), a rack (23) and a slide groove (24). The transmission device (2) is vertically installed between the gate A (11) and the gate B (16). The inspection cover plate (21) is located at the top of the transmission device (2). The gear (22) is located in the middle of the transmission device (2). The gear (22) is installed on the rotating shaft. The rack (23) is installed on the side of the gate A (11) and the gate B (16) close to the gear (22). The side of the urban road rainwater runoff pollution control device, the chute (24) is vertically and parallelly fixed on the left and right inner sides of the urban road rainwater runoff pollution control device, and the chute (24) is located on both sides of the gate A (11) and the gate B (16), and plays the role of a gate slot; when the gate B (16) is opened or closed, the rack (23) on the side of the gate B (16) can engage the gear (22) to rotate, and at the same time, the rotation of the gear (22) can engage the rack (23) on the side of the gate A (11) to move, thereby driving the gate A (11) to move; The initial rainwater diversion chamber (3) is located below the initial rainwater inlet (12); a discharge hole (31) connected to a sewage pipe (32) is provided at the bottom of the initial rainwater diversion chamber (3); a buoy frame (34) is provided on the inner wall of the initial rainwater diversion chamber (3); the sewage pipe (32) consists of a vertical section and a horizontal section; the discharge hole (31) is connected to the horizontal section of the sewage pipe (32); the vertical section of the sewage pipe (32) is connected to the municipal sewage pipe (8); and a check valve (33) is installed at the end of the vertical section of the sewage pipe (32); The diversion pipe (4) is composed of a vertical section and a horizontal section. The upper end of the vertical section is provided with two water inlet ports connected to the initial rainwater inlet (12) and the mid-to-late rainwater inlet (13), respectively. The horizontal section is connected to a sewage pipe (32) connected to the discharge hole (31). The horizontal section is provided with a water stopper (41). The end of the horizontal section is also connected to the sewage pipe (32) through a bypass pipe (42). The sand settling chamber (5) is located in the initial rainwater diversion chamber (3), the bottom of the sand settling chamber (5) is a sand settling box (52), the water outlet of the sand settling box (52) is provided with an overflow weir (51), and the sand settling box (52) is connected to the bottom of the manhole cover (14) through a traction rope (53); One end of the drainage pipe (6) is connected to the mid- and late-stage rainwater inlet (13), and the other end is connected to the municipal rainwater pipeline (7).

2. The urban road rainwater runoff pollution control device according to claim 1 is characterized in that: The slits of the grille (15) are in the shape of a regular quadrangular pyramid; the gate B (16) is in the shape of a plurality of regular quadrangular pyramids connected in parallel and having grooves on the side surfaces. When the gate B (16) rises to the highest point, it is just embedded and connected with the grille (15), so that the gate B reaches a closed state.

3. The urban road rainwater runoff pollution control device according to claim 1 is characterized in that: The gate A (11) and the gate B (16) are connected via a gear (22) and a rack (23), so that when the gate A (11) rises, the gate B (16) falls.

4. The urban road rainwater runoff pollution control device according to claim 1, characterized in that: The vertical section of the diversion pipe (4) is a "Y"-shaped pipe, and the two water inlet openings are respectively connected to the initial rainwater inlet (12) and the mid-to-late rainwater inlet (13). During rainfall, rainfall runoff can always flow into the diversion pipe (4).

5. The urban road rainwater runoff pollution control device according to claim 1 is characterized in that: The water stopper (41) is spherical in shape, and the diameter of the water stopper (41) is slightly smaller than the diameter of the diversion pipe (4) but larger than the diameter of the sewage pipe (32), and the diameter of the diversion pipe (4) is larger than the diameter of the sewage pipe (32); when it rains, the rainwater in the diversion pipe (4) impacts and pushes the water stopper (41) to block the discharge hole (31).

6. The urban road rainwater runoff pollution control device according to claim 1, characterized in that: The mass of the gate B (16) is greater than the mass of the gate A (11).

7. A control method for the urban road rainwater runoff pollution control device according to any one of claims 1 to 6, characterized in that The following steps are involved: ① When there is no rainfall, the equipment is in the initial state. At this time, gate A (11) is closed, gate B (16) is open, the water stopper (41) is away from the discharge hole (31), and the sand settling chamber (5) is located at the bottom of the initial rainwater diversion chamber (3); ② After rainfall occurs, initial rainwater on the road flows into the initial rainwater diversion chamber (3) through the initial rainwater inlet (12), and sediment begins to settle in the sand settling box (52); at the same time, a portion of the road rainwater flows into the diversion pipe (4) at the initial rainwater inlet (12), and a small portion of the rainwater flows into the sewage pipe (32) through the bypass pipe (42). The diameter of the bypass pipe (42) is much smaller than that of the diversion pipe (4). The rainwater in the diversion pipe (4) gradually impacts and pushes the water stopper (41) to block the discharge hole (31); ③ As the rainfall continues, the rainwater overflows the overflow weir (51), and the water level in the initial rainwater diversion chamber (3) continues to rise. When the water level in the initial rainwater diversion chamber (3) exceeds the bottom of the float (17), the float (17) pushes the gate B (16) up along the chute (24) under the action of the buoyancy of the rainwater; ④ When gate B (16) rises, the rack (23) on the side of gate B (16) engages with the gear (22) and rotates counterclockwise. After the gear (22) rotates, it drives the rack (23) on the side of gate A (11) to move downward, thereby driving gate A (11) to open downward; ⑤ When the gate B (16) rises to the highest point, it is just embedded and connected with the grille (15) as a whole, and the gate B (16) reaches the closed state; at this time, rainwater reaches the drainage pipe (6) through the middle and late rainwater inlet (13), and flows into the municipal rainwater pipe (7) through the drainage pipe (6); at the same time, a part of the road rainwater flows into the diversion pipe (4) at the middle and late rainwater inlet (13), maintaining the water pressure in the diversion pipe (4), the water stopper (41) always blocks the discharge hole (31), and the float (17) always pushes the gate B (16) so that the gate B (16) is in the closed state; ⑥ After the rainfall stops, the amount of rainwater in the diversion pipe (4) decreases continuously, and the water stopper (41) is retracted to the diversion pipe (4) away from the discharge hole (31) under the action of the rainwater pressure in the initial rainwater diversion chamber (3). The rainwater in the initial rainwater diversion chamber (3) flows into the municipal sewage pipe (8) through the discharge hole (31) and the sewage pipe (32); ⑦ As the water level in the initial rainwater diversion chamber (3) drops, the buoyancy of the float (17) gradually decreases, and the gate B (16) begins to open downward under the action of gravity and drives the gate A (11) upward through the transmission device until it closes; after the initial rainwater diversion chamber (3) is emptied, the manhole cover (14) is opened, and the sand box (52) is lifted out of the wellhead by the traction rope (53) for cleaning. After cleaning, it is returned to the bottom of the initial rainwater diversion chamber (3), and the equipment is restored to its initial state; By following the corresponding steps above, the process of controlling road rainwater runoff pollution can be achieved.

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