CN204753798U - Confluence system underground initial stage rainwater regulation pond - Google Patents

Abstract

The utility model discloses a confluence system underground initial stage rainwater regulation pond, include that the natural water that sets up, is linked together along water flow direction discharges unit and buffering regulation unit, the nature water discharges the unit and includes first buffer pool and set up the first water conservancy self -shooter of normality for closing in first buffer pool, and the first water conservancy self -shooter upper reaches are equipped with the inlet tube in the first buffer pool, and low reaches are equipped with nature water discharge port, buffering regulation unit includes second buffer pool and secret regulation pond with first buffer pool intercommunication, through the second water conservancy self -shooter intercommunication of normality for closing between second buffer pool and the secret regulation pond. The utility model discloses guaranteeing sewage treatment plant under the biggest throughput's the prerequisite, collecting the regulation pond with the initial stage rainwater, discharging the nature water with the later stage rainwater, effectually preventing that direct pollution of discharging of initial stage rainwater and overflow from polluting, and simple structure, with low costs, the automatic control that can make perfect need not manual operation, regulation safe and reliable.

Description

Combined underground initial rainwater storage tank

technical field

The utility model relates to a drainage system, in particular to an underground primary rainwater storage tank of combined flow system.

Background technique

With the continuous acceleration of the urbanization process and the influence of human activities, the urban impermeable area has increased significantly, which has greatly affected the natural hydrological cycle process, the surface runoff and peak flow have increased significantly, and the peak time has occurred earlier. The cycle is destroyed, the risk of urban flooding increases, and a large number of combined system overflow events emerge. Especially in my country, in recent years, heavy rains have caused drainage pipe network overflow events to occur continuously, and combined system overflow pollution has brought serious damage to water bodies. Pollution has seriously affected the lives of residents and brought huge economic losses.

After the initial rainwater scours the air and the surface, it will carry a large amount of toxic and harmful substances. If the initial rainwater is discharged directly without treatment, the water body will be seriously polluted. Although the combined drainage system can treat part of the sewage, most of the mixed sewage is discharged directly without treatment in rainy days, which becomes the pollution source of the receiving water body and causes it to be polluted. If a large number of pollutants in the combined overflow sewage are discharged directly into the receiving water body without treatment, it will not only directly affect the water quality of the receiving water body, but also may cause eutrophication of the water body and damage the aquatic ecosystem. Although the drainage system of new urban areas in my country adopts the rain and sewage separation system, many old urban areas still use the rain and sewage combined system. Due to the limitations of many conditions, it is basically impossible to change the confluence system to the diversion system in some areas. In this case, how to control the direct discharge of rainwater at the initial stage of the confluence system and avoid overflow pollution has become a comprehensive improvement of the water environment faced by many cities in our country. one of the major issues.

Therefore, it is necessary to establish a combined underground initial rainwater storage tank, and collect the initial rainwater into the storage tank, and then discharge it after treatment, which can effectively prevent water pollution and improve the water environment.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned deficiencies in the background technology, to provide a confluence underground initial rainwater storage tank, timely control the initial rainwater collection in the underground storage tank, and then discharge it after treatment, which can effectively prevent water pollution. Improve the water environment.

The technical solution of the present utility model is: a confluence system underground primary rainwater storage tank, which is characterized in that it includes a natural water body discharge unit and a buffer regulation and storage unit arranged along the direction of water flow and connected to each other, and the natural water body discharge unit includes the first A buffer pool and a first hydraulic automatic gate which is normally closed in the first buffer pool, a water inlet pipe is provided upstream of the first hydraulic automatic gate in the first buffer pool, and a natural water discharge port is provided downstream;

The buffer adjustment and storage unit includes a second buffer pool and an underground storage tank connected to the first buffer pool. The underground storage tank is located downstream of the second hydraulic automatic gate, the bottom of the second buffer tank is higher than or equal to the maximum water level of the underground storage tank, and the end of the second buffer tank is provided with a discharge pool. There is a drainage pipe connected to the sewage treatment plant, and a submersible sewage pump is installed in the underground storage tank.

Preferably, the second hydraulic automatic gate is normally closed, automatically opens when the upstream water level reaches the opening water level, and automatically closes when the downstream water level reaches the closing water level, and the opening water level height of the second hydraulic automatic gate is It is higher than or equal to the bottom of the buffer pool, and the closed water level height is the maximum storage water level height of the underground storage tank. Use the pilot-operated hydraulic automatic gate with the function of closing the maximum water level in the storage tank to control the water intake of the storage tank. When the water level in the storage tank rises to the maximum water level in the storage tank, the second hydraulic automatic gate will sense Close to the highest water level of the storage tank to prevent the rainwater in the buffer tank from continuing to enter the storage tank.

Further, the first hydraulic automatic gate is a floating box type upstream control weir gate, and the opening water level of the first hydraulic automatic gate is higher than the opening water level of the second hydraulic automatic gate. Utilize the first hydraulic automatic gate to discharge the rainwater exceeding the warning water level to the natural water body urgently (the rainwater can be discharged directly later). Regardless of whether the upstream water is large or small, the first hydraulic automatic gate can accurately keep the water level within the range of ± 25mm.

Preferably, a maximum flow rate limiting device is provided in the discharge pool, and the maximum flow rate limiter includes an electric gate and a first liquid level sensor and a second liquid level sensor that cooperate with the electric gate and are respectively located in the second buffer pool and the discharge pool .

Further, a flushing device and a high-definition camera are installed in the underground storage tank.

Further, it also includes a control unit, the signal output end of the high-definition camera is connected to the control unit, a third liquid level sensor is arranged in the underground storage tank, and the signal output end of the third liquid level sensor is connected to the control unit through the control unit. The signal input end of the flushing device is connected; the signal output end of the first liquid level sensor and the second liquid level sensor are connected with the signal input end of the submersible sewage pump and the signal input end of the electric gate through the control unit.

Furthermore, the flushing device and the high-definition camera are respectively arranged on the left and right sides of the underground storage tank. The quantity and position of the washing device and the high-definition camera can be adjusted according to the actual situation.

Preferably, a self-cleaning horizontal grid is provided upstream of the second hydraulic automatic gate in the second buffer pool, and the self-cleaning horizontal grid includes horizontal grids arranged at intervals in the vertical direction and interspersed between the grids. The rake teeth are driven by a hydraulic cylinder arranged behind the horizontal grille. The horizontal grille with self-cleaning function is set to intercept the floating and suspended matter entering the rainwater of the storage tank. During the rainfall process, the equipment operates continuously and automatically, scraping off the sundries stuck on the horizontal grille, allowing the floating and suspended matter to enter the downstream with the water flow for centralized treatment.

Preferably, the first buffer pool communicates with the second buffer pool through a connecting pipe, the connecting pipe is located in the recess at the bottom of the second buffer pool, and the top height of the connecting pipe is lower than or equal to that of the second buffer pool Height at bottom plane.

Further, the water inlet pipe is located in the recess at the bottom of the first buffer pool, the height of the bottom plane of the first buffer pool is equal to the height of the bottom plane of the second buffer pool, and the height of the top of the water inlet pipe is the same as that of the top of the connecting pipe. Even height. On sunny days, the sewage flow rate is small, and it enters the sewage treatment plant directly through the first buffer pool, the second buffer pool and the drainage pipe, and the other devices are not in operation.

In the utility model, the second hydraulic automatic gate is the entrance of the underground storage tank, which is in a normally closed state. The second hydraulic automatic gate has an opening water level higher than or equal to the bottom surface of the buffer tank, and is consistent with the maximum water level in the underground storage tank. Highly flush shut-off water level. When it rains, the first hydraulic automatic gate is installed at the discharge port of the natural water body, and is used to discharge later rainwater to the natural water body. The flow of rainwater mixed with sewage increases in the initial stage of rainfall. When the flow exceeds the limit flow rate of the maximum flow rate limiting device, the liquid level in the buffer pool will rise. After reaching the opening water level of the second hydraulic automatic gate, the second hydraulic automatic gate will open, and the initial rainwater will enter the underground for storage. In the pool, when the liquid level of the underground storage tank reaches the maximum water level, the second hydraulic automatic gate is closed, the water level in the second buffer pool and the first buffer pool rises, and the first hydraulic automatic gate opens when the liquid level in the first buffer pool reaches the water level. The hydraulic automatic gate is opened to discharge the later rainwater to the natural water body.

Under the premise of ensuring the maximum processing capacity of the sewage treatment plant, the utility model collects the initial rainwater into the underground storage tank, and discharges the later rainwater to the natural water body. When the sewage treatment plant has the processing capacity, the rainwater from the underground storage tank will be pumped to the second buffer pool, and then discharged to the sewage treatment plant through pipelines for treatment. The initial rainwater is collected into the underground storage tank, which avoids the harm of the initial rainwater to the natural water body; through the cooperation of the natural water body discharge unit and the buffer storage unit, the middle and late rainwater after the underground storage tank is full is discharged to the natural water body in time, and then Overflow pollution is prevented; after the rainfall ends, when the discharge flow of the second buffer tank is less than the maximum treatment capacity of the sewage plant, the submersible sewage pump starts to discharge the rainwater in the underground storage tank to the second buffer tank through the pipeline; the flushing device The bottom of the pool is stirred and washed. After washing, a high-definition camera is used to collect images of the bottom of the underground storage tank, and fixed-point washing is performed on the unwashed positions to clean the underground storage tank.

Under the premise of ensuring the maximum processing capacity of the sewage treatment plant, the utility model collects the initial rainwater into the underground storage tank, and discharges the later rainwater to the natural water body, effectively preventing the pollution of the initial rainwater from direct discharge and overflow pollution, and The structure is simple, the cost is low, it can be controlled fully automatically, no manual operation is required, and the regulation and storage is safe and reliable.

Description of drawings

Fig. 1 is the structural representation of the utility model

Figure 2 is a cross-sectional view of A-A in Figure 1

Figure 3 is a top view of the self-cleaning horizontal grille

Figure 4 is a side view of the self-cleaning horizontal grille

Figure 5 is a structural schematic diagram of the second hydraulic automatic gate

Figure 6 is a top view of the structure of the second hydraulic automatic gate

Figure 7 is a schematic diagram of the opening structure of the buoyant chamber of the second hydraulic automatic gate

Figure 8 is a schematic diagram of opening the second hydraulic automatic gate

Figure 9 is a schematic diagram of the closing structure of the buoyant chamber of the second hydraulic automatic gate

Figure 10 is a schematic diagram of closing the gate of the second hydraulic automatic gate

Among them: 1. The first buffer pool 2. The second buffer pool 3. Inlet pipe 4. Natural water outlet 5. The first hydraulic automatic gate 6. Underground storage tank 7. The second hydraulic automatic gate 8. Submersible sewage pump 9 .Rinsing device 10. HD camera 11. Third liquid level sensor 12. Self-cleaning horizontal grid 13. Connecting pipe 14. Electric gate 15. First liquid level sensor 16. Second liquid level sensor 17. Discharge pool 18. Drainage Pipe 19. Water catchment area 20. Opening water level height of the second hydraulic automatic gate 21. Maximum impounding water level height of the storage tank 22. Opening water level height of the first hydraulic automatic gate 701. Rotary shaft 702. Floating tank 703. Gate 704. Floating tank Chamber 705. Float chamber 706. Float 707. Water inlet 708. Water outlet 709. Counterweight 710. First pulley 711. Second pulley 712. Steel wire rope 121. Horizontal grid bar 122. Rake teeth 123. Hydraulic cylinder.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1-2, the utility model includes a connected natural water body discharge unit and a buffer storage unit, the upper and lower sides in Figure 1 correspond to the rear and front of this embodiment, and the left and right sides correspond to the left and right sides of the utility model. The natural water body discharge unit includes the first buffer pool 1 and the first hydraulic automatic gate 5 that is normally closed in the first buffer pool 1; the buffer storage unit includes the second buffer pool 2 and the underground storage tank 6, and the second buffer pool A discharge pool 17 is provided at the right end of the pool 2 . The second buffer pool 2 communicates with the underground storage pool 6 through the second hydraulic automatic gate 7 which is normally closed. The first buffer tank 1 and the second buffer tank 2 are communicated through the connecting pipe 13, the left side of the first buffer tank 1 (upstream of the first hydraulic automatic gate 5) is provided with a water inlet pipe 3, and the rear of the first buffer tank 1 (the first hydraulic automatic gate 5) The downstream of the automatic gate 5) is provided with a natural water discharge port 4.

The connecting pipe 13 is located in the recess at the bottom of the second buffer pool 2 , and the height of the top of the connecting pipe 13 is lower than or equal to the height of the bottom plane of the second buffer pool 2 . The water inlet pipe 1 is located in the recess at the bottom of the first buffer tank 1, the height of the bottom plane of the first buffer tank 1 is equal to the height of the bottom plane of the second buffer tank 2, and the height of the bottom and top of the water inlet pipe 1 is the same as that of the top of the connecting pipe 13. , The height of the bottom is even. The underground storage tank 6 is located at the downstream of the second hydraulic automatic gate 7. The discharge tank 17 is provided with a drainpipe 18 connected to the sewage treatment plant. The bottom of the underground storage tank 6 is concave to form a catchment area 19. A submersible sewage pump 8 located in the catchment area 19 is arranged inside, and the submersible sewage pump 8 leads to the second buffer tank 2 .

The first hydraulic automatic gate 5 is a buoyant box type upstream control weir gate (the structure has been disclosed by the utility model CN204059312). The second buffer tank 2 and the underground storage tank 6 are connected through the second hydraulic automatic gate 7. The second hydraulic automatic gate 7 is normally closed, automatically opened when the upstream water level reaches the open water level, and automatically closed when the downstream water level reaches the closed water level. Pilot-operated hydraulic automatic gate. As shown in Figure 5-10, the pilot-operated hydraulic automatic gate includes a rotating shaft 701 fixed between the two walls of the second buffer pool 2, and a floating tank 702 and a gate 703 respectively arranged on both sides of the rotating shaft 701. The floating tank 702 is located on the buoy In the box chamber 704, a float chamber 705 is provided in the underground storage tank 6, and the bottom of the float chamber 705 has a water flow hole communicating with the underground storage tank 6; a float 706 is provided in the float chamber 705; There is a water inlet 707 at the bottom of the side wall of the pontoon chamber 704 of 2, and there is a water outlet 708 at the bottom of the side wall of the pontoon chamber near the underground storage tank 6. The diameter of the water inlet 707 is much larger than the water outlet hole 708; There is a counterweight 709 to block the water inlet 707, and the linkage between the counterweight 709 and the float 706 is carried out through a linkage device. The second pulley 711 above the box chamber 704, the steel wire rope 712 is connected between the float 706 and the counterweight 709, one end of the steel rope 712 is connected to the float 706, and the other end passes through the first pulley 710, and the second pulley 711 is connected to the counterweight 709 ; The mass of the float 706 is greater than the mass of the counterweight 709 . Wherein the water level height of the water inlet 707 of the second buffer tank 2 pontoon chamber 704 water inlet 707 is the opening water level height of the second hydraulic automatic gate 20.

In the second buffer tank 2, a self-cleaning horizontal grid 12 is provided in front of the second hydraulic automatic gate 7 (upstream). As shown in Figures 3-4, the self-cleaning horizontal grid 12 includes horizontal grid bars 121 arranged at intervals in the vertical direction and rake teeth 122 interspersed between each grid 121, and the rake teeth 122 are arranged on the horizontal grid bars 121 The hydraulic cylinder 123 at the rear is driven. The hydraulic cylinder 123 drives the rake teeth 122 to move back and forth between the horizontal grid bars 121 to remove the sundries between the horizontal grid bars 121 . The bottom of the second buffer tank 2 is higher than or equal to the maximum water level height of the underground storage tank 6, as shown in the maximum storage water level height 21 of the storage tank in Fig. 2, the bottom of the second buffer tank 2 in this embodiment is higher than the underground The height of the maximum storage water level in the storage tank 6. The outer end of the discharge pool 17 is provided with a drainpipe 18 connected to the sewage treatment plant, and a submersible sewage pump 8 is provided in the underground storage tank 6 , and the drainage end of the submersible sewage pump 8 leads to the second buffer pool 2 .

The opening water level height 20 of the second hydraulic automatic gate is higher than or equal to the bottom height of the second buffer pool 2. In this embodiment, the opening water level height 20 of the second hydraulic automatic gate is higher than the bottom height of the second buffer pool 2, and the closing water level height is The maximum storage water level height of the storage tank is 21. The opening water level height 22 of the first hydraulic automatic gate is higher than the opening water level height 20 of the second hydraulic automatic gate, and is lower than the maximum water level of the second hydraulic automatic gate 7 . A maximum flow rate limiting device is provided in the discharge pool, and the maximum flow rate limiter includes an electric gate 14 and a first liquid level sensor 15 and a second liquid level sensor 15 that cooperate with the electric gate 14 and are respectively located in the second buffer pool 2 and the discharge pool 17. sensor 16. The underground storage tank 6 is provided with a flushing device 9 and a high-definition camera 10. The flushing device 9 and the high-definition camera 10 are respectively arranged on the left and right sides of the underground storage tank 6. The flushing device 9 is an intelligent injector. The number and position of the flushing device and high-definition cameras can be adjusted and arranged according to the actual situation.

The above combined underground primary rainwater storage tank also includes a control unit (not shown in the figure), and the control unit includes a PLC controller and a SCADA system. The signal input terminal of the high-definition camera 10 is connected to the control unit, and the third liquid level sensor 11 is arranged in the underground storage tank 6, and the control unit controls the submersible sewage pump 8, the flushing device 9, the high-definition camera 10, the third liquid level sensor 11, the maximum The flow limiting device and the self-cleaning horizontal grid 12 are monitored, and the signal output end of the third liquid level sensor 11 is connected to the signal input end of the flushing device 9 through the control unit; the first liquid level sensor 15 and the second liquid level sensor 16 output The terminal is connected with the signal input terminal of the submersible sewage pump 8 and the signal input terminal of the electric gate 14 through the control unit. The self-cleaning horizontal grid 12 also includes a grid liquid level sensor (not shown), the signal output end of the grid liquid level sensor is connected with the control unit, and the signal input end of the hydraulic cylinder 123 is connected with the control unit. When the liquid level reaches the lowermost horizontal grid, the grid liquid level sensor transmits the signal to the hydraulic cylinder 123 through the control unit, and the hydraulic cylinder 123 moves to drive the rake teeth 122 to move. The sundries are scraped off, and the floating and suspended solids enter the downstream with the water flow and are then concentrated for treatment.

The working process of the combined system underground primary rainwater storage tank is as follows:

On sunny days, both the first hydraulic automatic gate 5 and the second hydraulic automatic gate 7 are closed, the flow of sewage entering from the water inlet pipe 3 is less than the maximum treatment capacity of the sewage treatment plant, and the sewage directly flows through the first buffer pool 1 and the second The buffer pool 2 is discharged from the drainage chamber 17 to the sewage treatment plant through the drainage pipe 18 for treatment. Since the height of the top of the connecting pipe 13 is lower than or equal to the height of the bottom plane of the second buffer pool 2, at this time, the sewage flows in the recesses of the first buffer pool 1 and the second buffer pool 2, and will not pass through the self-cleaning level. Grille 12 enters in the storage tank, and each equipment in the underground storage tank 6 will not run.

In the initial stage of rainfall, the sum of the initial rainwater flow and sewage flow is less than the maximum treatment capacity of the sewage treatment plant, and the mixed sewage is also directly discharged to the sewage treatment plant for treatment. As the rainfall progresses, the sum of the initial rainwater flow and sewage flow is greater than the maximum treatment capacity of the sewage treatment plant. At this time, the maximum flow limiting device ensures that the flow entering the sewage treatment plant is still the maximum treatment capacity of the sewage treatment plant. So far the second hydraulic automatic gate 7 has been in the closed state, there is no water in the underground storage tank 6, and there is no water in the float chamber 705, and the float 706 pulls the counterweight 709 to the top through the pulley 710 and the pulley 711, as shown in Figure 7 As shown, the water inlet 707 is always in the open state. When the water level of the second buffer pool 2 continues to rise, the water level of the second buffer pool 2 rises to the water inlet level of the water inlet 707, that is, when the second hydraulic automatic gate opens the water level 20, The water flow rushes into the buoyancy chamber 704 rapidly, and the floating buoyancy of the buoyancy chamber 702 drives the gate 703 to open, as shown in FIG. 8 . The initial rainwater enters the underground storage tank 6 after being intercepted by the self-cleaning horizontal grid 12 . When the water level of the underground storage tank 6 gradually rises to the water inlet level of the float chamber 705, that is, when the maximum storage water level of the underground storage tank is 21, the float 706 floats up, and the counterweight 709 descends through the steel wire rope 712 and the float 706. Live in the water inlet, as shown in Figure 9, the water in the buoyancy chamber 704 slowly flows out from the water outlet hole 708, and the float 702 sinks to drive the gate 703 to close, as shown in Figure 10.

After the second hydraulic automatic gate 7 was closed, the water level of the second buffer pool 2 continued to rise. When the water level is high, the first hydraulic automatic gate 5 is opened, and later rainwater is discharged to the natural water body through the natural water body discharge port 4 .

When the rainfall decreases or stops and the flow of the second buffer tank 2 is less than the maximum processing capacity of the sewage treatment plant, that is, the first liquid level sensor 15 and the second liquid level sensor 16 of the maximum flow limiting device cooperate to sense the second buffer The flow rate of pool 2 is less than the maximum flow rate, and the maximum flow rate limiting device turns on the submersible sewage pump 8 through the control unit, and the submersible sewage pump 8 starts to pump the rainwater from the underground storage tank 6 to the second buffer pool 2, and discharges it to the sewage treatment through the drain pipe 18 factory for processing.

The third liquid level sensor 11 monitors the water level in the underground storage tank 6 in real time. When the water level of the lower storage tank 6 drops, the third liquid level sensor 11 transmits the signal to the flushing device 9 through the control unit, and the smart ejector of the flushing device 9 starts to stir, so that part of the sediment deposited at the bottom of the pool is taken away by the rainwater, When the water level of the underground storage tank 6 drops to the bottom of the pool, the third liquid level sensor 11 transmits the signal to the flushing device 9 through the control unit, and the smart injector starts to flush the bottom of the pool, and after flushing, it is collected by the high-definition camera 10 The bottom image of the storage tank 6 is underground, and the image signal is transmitted to the control unit. The control unit performs intelligent grid area division on the bottom of the storage tank 6. The coordinate relationship of the device 9 is to control the head of the water pump of the flushing device 9 and the required angle of rotation, so that the flushing device 9 performs point-to-point cleaning on the position of the stain, and rinses the underground storage tank 6 clean. The entire flushing process does not require an external water source, and the flushing effect is better than that of the flap flushing door and hydraulic dumping bucket, and the sediment content in the water is small, so it will not silt the buffer pool and pipes.

The above is only a specific embodiment of the present utility model. It should be pointed out that any changes or replacements that can be easily imagined by those skilled in the art within the technical scope disclosed in the present utility model should be covered by the present utility model. within the scope of protection.

Claims (10)

1. a combined system underground Rainwater Storage Tank, it is characterized in that, comprise arrange along water (flow) direction, gentle the reconstituting of the natural water exhaust unit that is connected store unit, described natural water exhaust unit comprises the first Buffer Pool (1) and is arranged on the first Buffer Pool (1) interior normality is first Hydro-automatic gate (5) of closing, in described first Buffer Pool (1), the first Hydro-automatic gate (5) upstream is provided with water inlet pipe (3), and downstream is provided with natural water floss hole (4);

Described buffering unit of regulating and storing comprises the second Buffer Pool (2) and aquifer reserve pond (6) that are communicated with the first Buffer Pool (1), described second Buffer Pool (2) be that second Hydro-automatic gate (7) of closing is communicated with by normality between aquifer reserve pond (6), described aquifer reserve pond (6) is positioned at the downstream of the second Hydro-automatic gate (7), described second Buffer Pool (2) bottom higher than or flush in the maximum impounded water levels height in aquifer reserve pond (6); Described second Buffer Pool (2) end is provided with discharge pond (17), described discharge pond (17) is provided with the gutter (18) being communicated to Wastewater Treatment Plant, is provided with submersible sewage pump (8) in described aquifer reserve pond (6).

2. combined system underground as claimed in claim 1 Rainwater Storage Tank, it is characterized in that, described second Hydro-automatic gate (7) for normality be close, upper pond level arrive and open water level time automatically open, the level of tail water arrive and close water level time the pilot-operated type Hydro-automatic gate of automatically closing, the unlatching height of water level of described second Hydro-automatic gate (7) higher than or flush in the second Buffer Pool (2) bottom, closing height of water level is the maximum impounded water levels height in aquifer reserve pond (6).

3. combined system underground as claimed in claim 2 Rainwater Storage Tank, it is characterized in that, described first Hydro-automatic gate (5) is floating box type upstream control weir gate, and the unlatching height of water level of described first Hydro-automatic gate (5) opens height of water level higher than the second Hydro-automatic gate (7).

4. combined system underground as claimed in claim 1 Rainwater Storage Tank, it is characterized in that, be provided with maximum stream flow current-limiting apparatus in described discharge pond (17), maximum stream flow current-limiting apparatus comprises electric gate valve (14) and coordinates with electric gate valve (14) and lay respectively at the second Buffer Pool (2), discharge the first liquid level sensor (15) in pond (17) and the second liquid level sensor (16).

5. combined system underground as claimed in claim 4 Rainwater Storage Tank, is characterized in that, be provided with flusher (9) and high-definition camera (10) in described aquifer reserve pond (6).

6. combined system underground as claimed in claim 5 Rainwater Storage Tank, it is characterized in that, also comprise control unit, described high-definition camera (10) signal output part is connected with control unit, be provided with the 3rd liquid level sensor (11) in described aquifer reserve pond (6), the signal output part of described 3rd liquid level sensor (11) is connected with flusher (9) signal input part by control unit; First liquid level sensor (15) and the second liquid level sensor (16) signal output part are connected by the signal input part of control unit and submersible sewage pump (8), electric gate valve (14) signal input part.

7. combined system underground as claimed in claim 5 Rainwater Storage Tank, it is characterized in that, described flusher (9) and high-definition camera (10) are separately positioned on aquifer reserve pond (6) left and right sides.

8. combined system underground as claimed in claim 1 Rainwater Storage Tank, it is characterized in that, in described second Buffer Pool (2), the second Hydro-automatic gate (7) upstream is provided with self-cleaning horizontal grate (12), the rake teeth (122) that described self-cleaning horizontal grate (12) comprises vertically spaced horizontal grate bar (121) and interts between each horizontal grate bar (121), described rake teeth (122) is driven by the hydraulic jack (123) being arranged on horizontal grate bar (121) rear.

9. combined system underground as claimed in claim 1 Rainwater Storage Tank, it is characterized in that, described first Buffer Pool (1) is communicated with by tube connector (13) with the second Buffer Pool (2), described tube connector (13) is positioned at the lower recess in the second Buffer Pool (2) bottom, described tube connector (13) overhead height lower than or flush in the second Buffer Pool (2) base plane place height.

10. combined system underground as claimed in claim 9 Rainwater Storage Tank, it is characterized in that, described water inlet pipe (3) is positioned at the lower recess in the first Buffer Pool (1) bottom, described first Buffer Pool (1) base plane place height is concordant with the second Buffer Pool (2) base plane place height, and described water inlet pipe (3) overhead height is concordant with tube connector (13) overhead height.