Underpass peak-shifting regulation and storage anti-flood system and regulation and storage method

Abstract

The present application relates to a kind of underpass peak-shifting regulation and storage anti-flooding system and regulation and storage method, belong to urban drainage field, especially to a kind of urban road overpass underpass anti-flooding system.By regulation and storage unit, pump station, control unit is formed, regulation and storage unit is set in underpass approach, does not occupy land additionally, several series regulation and storage pools are arranged in ladder shape, and the road surface rainwater of underpass is collected and discharged into regulation and storage pool temporary storage.In the whole rainfall process, control unit according to rainfall amount dynamically controls the flow of regulation and storage pool into pump station, so that rainwater in storm peak time period is stored by peak-shifting regulation, reduces the flow of regulation and storage pool into pump station in rainfall peak, effectively deal with extreme weather rainfall, prevent pump station from exceeding discharge capacity and not discharging to cause underpass waterlogging.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of underpass peak-shifting regulation and storage anti-flood system and regulation and storage method, belong to urban drainage field, especially to a kind of anti-flood system of urban road overpass underpass. BACKGROUND

[0002] City road trunk road and trunk road intersection generally adopt three-dimensional intersection, in addition to overpass bridge of overpass, underpass is also commonly used three-dimensional intersection mode, in many cities.In the intersection of two intersecting roads, tunnel is arranged under ground road, and approach is connected at both ends of the tunnel, underpass passes through from ground road, and does not interfere with each other's driving.

[0003] The length of approach on both sides of underpass is generally 200-300 m, which is open type, the cross slope of approach is generally 1.5-2%, and the longitudinal slope of approach is generally 4-5%.Since the longitudinal slope of approach is greater than the cross slope, even if the rainwater inlet is arranged on the roadside to collect water, the rainwater falling on the road surface flows quickly along the road surface, and most of the road surface rainwater is not collected into the rainwater inlet and flows into the rainwater pipe, but flows quickly to the tunnel along the road surface, and the rainwater inlet at the tunnel entrance cannot collect excessive rainwater in time, which is one of the reasons causing waterlogging in underpass.

[0004] During heavy rain, the road connected with the approach is caused by rainfall exceeding the drainage capacity of the rainwater pipe, and a large amount of water is caused on the road surface, which also flows into the underpass through the approach, which is another reason causing waterlogging in underpass.The tunnel entrance of underpass is generally low, and pump station is generally used for drainage, but the water flowing into the underpass exceeds the drainage capacity of the pump station, and cannot be discharged in time, which is the main reason causing waterlogging in underpass.The accumulated water in the tunnel causes waterlogging, which causes traffic interruption, and serious accidents such as vehicle and personnel casualties.

[0005] To solve the problem of waterlogging in underpass, mainly from pump station, one is to increase the number of water pumps or increase the flow of water pumps, and the other is to set up a water storage tank connected with the pump station, to increase the regulation and storage capacity of the pump station.The number of water pumps or the flow of water pumps is increased in the existing underpass pump station, which is difficult to transform due to the limitation of existing pump station, even if the new pump station is built, the drainage capacity of the pump station cannot be greatly increased according to the design of certain recurrence period of heavy rain intensity.The regulation and storage tank is set on the drainage system, the peak flow of rainwater runoff is temporarily stored in the regulation and storage tank, which can stagger the peak period of heavy rain, delay the outflow time, reduce the burden of downstream pipe section or pump station, and thus reduce the occurrence of waterlogging.

[0006] The underpass of urban overpass is difficult to build a regulating reservoir due to land shortage. Even if there is a location to set the regulating reservoir, the road surface of the underpass is low, and the water surface of the regulating reservoir should be lower than the road surface of the underpass to ensure that the lowest part of the underpass is not waterlogged. The problem of waterlogging in the underpass is solved by using the regulating reservoir, and the regulating reservoir needs to have sufficient volume. Increasing the effective regulating volume of the regulating reservoir can expand the area of the regulating reservoir or increase the water storage depth, and increasing the area requires increasing the land, which is difficult to implement. Setting a deep regulating reservoir can improve the regulating capacity, but the water surface cannot be higher than the road surface of the underpass, and the space above the water surface of the regulating reservoir is useless volume. Deepening the regulating reservoir requires a water pump with a larger lift to increase the power consumption of the water pump. Moreover, due to the limitation of the lift of the water pump and the feasibility of construction, the depth of the regulating reservoir is also limited, and deepening the regulating reservoir has little effect on the regulating function of the pump station during heavy rain. The drainage pump station of the underpass is designed to discharge the flow according to the intensity of the 5-10 year return period of heavy rain, and it is easy to cause waterlogging in the underpass when encountering extreme heavy rain. SUMMARY

[0007] The purpose of the present application is to provide a peak-shifting regulating anti-flooding system for underpass, which is composed of a regulating unit, a pump station and a control unit. The regulating unit is a series of regulating reservoirs arranged under the approach of the underpass. The regulating reservoirs are arranged in a stepped manner, and the rainwater on the road surface of the underpass is collected and discharged into the regulating reservoir for temporary storage. During the entire rainfall process, the control unit dynamically controls the flow of the regulating reservoir into the pump station according to the rainfall, so that the rainwater during the peak period of heavy rain is subjected to peak-shifting regulation, the flow discharged into the pump station during the peak period of heavy rain is reduced, and the waterlogging in the underpass caused by the discharge of the pump station exceeding the discharge capacity is prevented.

[0008] The present application is achieved by the following technical means:

[0009] A peak-shifting regulating anti-flooding system for underpass, characterized in that it comprises a regulating unit, a pump station and a control unit. The regulating unit is composed of a plurality of regulating reservoirs connected in series. The regulating reservoirs are arranged under the approach of the tunnel on both sides of the underpass in a stepped manner. A flow interception groove is arranged on the approach corresponding to each regulating reservoir. The flow interception groove is connected to the regulating reservoir through a pipeline. A tunnel water inlet is arranged at the entrance of the tunnel. The tunnel water inlet is connected to the regulating unit through a pipeline. A siphon pipe and an overflow weir are arranged between two connected regulating reservoirs. The regulating reservoirs are connected in series through the siphon pipe and the overflow weir. The pump station is connected to the regulating unit through a drainage pipe. The control unit is used to dynamically control the flow of the regulating reservoir into the pump station.

[0010] The control unit is composed of a flow meter module, a water level meter module and a water full sensor module to form a data input end. An operation module is a data operation processor. A negative pressure control module and a siphon control module form a control output end. The operation module is connected to a monitoring terminal. The monitoring terminal is used to set peak-shifting regulating parameters and implement monitoring of the regulating state.

[0011] The two groups of regulating and storing pools are arranged according to the approach of the two directions A and B of the tunnel, each group is composed of a primary pool, an intermediate pool and a final pool, the primary pool is located at the top of the slope of the approach, the final pool is located at the bottom of the slope of the approach, and a plurality of intermediate pools are connected in series between the primary pool and the final pool.

[0012] The tunnel water inlet is two, which is arranged at the two entrances of the tunnel respectively, the tunnel water inlet is communicated with the final pool through a pipeline, and the final pools of the two groups of regulating and storing pools are communicated through a communication pipe.

[0013] The two intercepting grooves are arranged in a group and are connected with each other at 90° to form a "∟" shape, one of the two intercepting grooves is arranged in parallel with the center line of the road and close to the curb stone in the longitudinal direction, and the other is arranged in the transverse direction of the outer lane on the two sides of the approach, the intercepting grooves are connected with the water collecting well and the regulating and storing pool through the water inlet pipe.

[0014] The siphon drainage is adopted for the drainage of the regulating and storing pool, the regulating and storing pool is made of reinforced concrete, and no less than two inspection wells are arranged in each regulating and storing pool.

[0015] The siphon pipe is arranged between the two regulating and storing pools, the siphon pipe is arranged on the left side L and the right side R of the regulating and storing pool, a negative pressure main pipe is arranged along the lower edge of the approach and is connected with a negative pressure device, a negative pressure control pipe is arranged at the top of the siphon pipe, the negative pressure control pipe is connected with the negative pressure main pipe through a negative pressure control valve, a negative pressure release valve is arranged on the pipe section of the negative pressure control pipe, a full water sensor is arranged at the top of the siphon pipe, when the inlet and the outlet of the siphon pipe are immersed in water when the regulating and storing pool stores water, the control unit controls the negative pressure control valve to be opened, negative pressure is generated in the siphon pipe, the water level in the pipe rises, when the water level rises to the top of the siphon pipe, the siphon is formed under the action of the gravity of water and the atmospheric pressure, the water in the high regulating and storing pool is discharged into the low regulating and storing pool through the siphon pipe, the full water sensor detects that the siphon pipe is full of water, the control unit controls the negative pressure control valve to be closed, the siphon pipe maintains siphon drainage, the control unit controls the negative pressure release valve to be opened, the siphon in the siphon pipe is destroyed, and the siphon pipe stops discharging, the left side L and the right side R siphon pipes of each regulating and storing pool are controlled by the control unit respectively.

[0016] The overflow weir is arranged on one side of the high regulating and storing pool between the two regulating and storing pools, the height H of the top of the overflow weir from the bottom of the pool is the water storage depth, the pool wall between the overflow weir and the low regulating and storing pool is provided with an overflow port, when the water storage of the high regulating and storing pool is higher than the top of the overflow weir, the water overflows the overflow weir and flows into the low regulating and storing pool through the overflow port.

[0017] The downstream end bottom of the primary pool and the intermediate pool is provided with a siphon pipe inlet water collecting groove, the inlet of the siphon pipe is lower than the top of the siphon pipe inlet water collecting groove by 100-200 mm, and the upstream bottom of the intermediate pool and the final pool is provided with a siphon pipe outlet water collecting groove, the outlet of the siphon pipe is lower than the top of the siphon pipe outlet water collecting groove by 100-200 mm.

[0018] The pipe bottom of the upper bend of the siphon is 50-100 mm higher than the top of the overflow weir.

[0019] The water level gauge is arranged in the regulating and storing tank.

[0020] The flow meter is arranged on the drain pipe.

[0021] The regulating and storing method of the underpass channel staggered peak regulating and storing anti-flood system is a method of dynamic regulating and storing according to water depth and flow, in the whole rainfall process, the flow of the regulating and storing tank into the pump station is dynamically adjusted according to the rainfall, when the rainfall is small in the early stage of rainfall, the water collected in the regulating and storing tank is discharged into the pump station, so as to reduce the water storage in the regulating and storing tank, when the rainfall increases, the flow of the water in the regulating and storing tank into the pump station is reduced, when the rainfall reaches the peak, the flow of the regulating and storing tank into the pump station is controlled to be not more than the designed drainage capacity of the pump station, after the rainfall peak, the rainfall decreases, and then the water in the regulating and storing tank is discharged into the pump station, so as to achieve the purpose of staggered peak regulating and storing, and the regulating and storing steps are as follows:

[0022] a. Parameter setting, according to the designed flow Q of the pump station, a threshold value E is set by the control unit, the threshold flow is EQ, the actual flow detected by the flow meter is Qc, and the control unit sets a first water level h1 and a second water level h2 for each regulating and storing tank;

[0023] b. In the early stage of rainfall, the rainfall is small, the rainwater collected in the intercepting groove connected with the primary tank and the intermediate tank is stored in the tank, the rainwater collected in the intercepting groove connected with the terminal tank and the tunnel water inlet is discharged into the tank, and is discharged to the pump station through the drain pipe;

[0024] c. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary tank and the intermediate tank on the A and B directions is greater than h1, the L side siphon is used for siphon drainage, the water in the tank is discharged to the lower regulating and storing tank, and the primary tank, the intermediate tank and the terminal tank are sequentially drained;

[0025] d. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary tank and the intermediate tank is greater than h2, the R side siphon is used for siphon drainage, and double pipes are used to accelerate the discharge of the water;

[0026] e. In the state of step d, if the rainfall does not continuously increase, when the water level h of any one of the intermediate tanks is reduced to h < h1, and the water depth Z of the tank is less than the water depth Z of the upper regulating and storing tank, the L side siphon stops draining, the R side siphon continues to drain, and the double-side drainage is changed into single-side drainage;

[0027] f. In the state of step d, if the rainfall increases, when the actual flow Qc is greater than the threshold flow EQ, and the actual flow Qc is less than the designed flow Q, the double-side siphon continues to drain;

[0028] g. When the rainfall continues to increase, and the actual flow Qc is greater than the design flow Q, the siphon of the A-direction approach channel regulation tank stops draining, and the rainwater is stored in the regulation tank. The siphon of the B-direction regulation tank continues to drain.

[0029] h. When the rainfall reaches the peak, and the actual flow Qc is less than the design flow Q, the A-direction regulation tank continues to store water, and the siphon of the B-direction regulation tank drains. When the water level h of any one regulation tank in the A-direction is greater than H, the overflow is full, the A and B directions are exchanged, the B-direction regulation tank stores water, and the siphon of the A-direction regulation tank drains.

[0030] i. When the rainfall reaches the peak, and the actual flow Qc is greater than the design flow Q, the regulation tanks in the A and B directions both stop draining, and all primary tanks and intermediate tanks enter the storage state. The rainwater in the range of the final tank is drained into the pump station.

[0031] j. After the rainfall peak, the rainfall gradually decreases, the siphons of the A and B direction regulation tanks are opened to drain, and the actual flow Qc is controlled to be greater than the threshold flow EQ and less than the design flow Q.

[0032] k. After the rainfall ends, if there is stored water in the regulation tank, the siphons of the A and B direction regulation tanks continue to drain, and the actual flow Qc is controlled to be greater than the threshold flow EQ and less than the design flow Q, so as to empty the storage and facilitate the next rainfall regulation.

[0033] The beneficial effects of the present application are:

[0034] The regulation tank is arranged under the approach channel without occupying additional land, and can obtain a large volume. The control unit dynamically controls the flow of the regulation tank drained into the pump station according to the rainfall, so that the rainwater in the peak period of the rainstorm is regulated by peak shifting, the flow drained into the pump station at the peak of the rainfall is reduced, the waterlogging in the underpass is prevented, the extreme weather rainfall is effectively dealt with, and the traffic jam, property loss and even personnel casualty accidents caused by the vehicle being flooded are avoided.

[0035] The regulation tank is arranged under the approach channel without occupying additional land, and can obtain a large volume. The control unit dynamically controls the flow of the regulation tank drained into the pump station according to the rainfall, so that the rainwater in the peak period of the rainstorm is regulated by peak shifting, the flow drained into the pump station at the peak of the rainfall is reduced, the waterlogging in the underpass is prevented, the extreme weather rainfall is effectively dealt with, and the traffic jam, property loss and even personnel casualty accidents caused by the vehicle being flooded are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The plan view of the present application;

[0037] Figure 2 The longitudinal section view of the underpass peak-shifting regulation anti-flooding system of the present application;

[0038] Figure 3Regulation and storage pool plan view

[0039] Figure 4 Regulation and storage pool longitudinal section view Figure 3 of 1-1 section;

[0040] Figure 5 Regulation and storage pool transverse section view Figure 3 of 2-2 section;

[0041] Figure 6 Regulation and storage pool horizontal section view Figure 4 of 3-3 section;

[0042] Figure 7 Control unit schematic diagram

[0043] Figure 8 Rainwater peak-shaving regulation schematic diagram

[0044] In the figure: 100 - regulation and storage pool, 200 - pump station, 300 - control unit, 400 - negative pressure device, 500 - monitoring terminal, 1 - tunnel, 2 - approach, 3 - primary pool, 4 - intermediate pool, 5 - final pool, 6 - intercepting tank, 7 - siphon, 8 - overflow weir, 9 - tunnel water inlet, 10 - communication pipe, 11 - drain pipe, 12 - curb, 13 - water collecting well, 14 - water inlet pipe, 15 - negative pressure main pipe, 16 - negative pressure control pipe, 17 - negative pressure control valve, 18 - negative pressure release valve, 19 - full water sensor, 20 - overflow, 21 - siphon inlet water collecting tank, 22 - siphon outlet water collecting tank, 23 - water level meter, 24 - flow meter, 25 - retaining wall, 26 - inspection well, 27 - construction column, 28 - manhole, 401 - vacuum pump, 402 - negative pressure tank. DETAILED DESCRIPTION

[0045] For the better understanding of the present application by the person skilled in the art, the present application is further described in conjunction with Figures 1-8 the content mentioned in the embodiments is not a limitation of the present application.

[0046] The application is a kind of system for peak-shaving regulation and storage of underpass, which can effectively prevent the underpass from waterlogging caused by rainstorm. The system comprises a regulation and storage unit 100, a pump station 200 and a control unit 300. The regulation and storage unit 100 is composed of a plurality of regulation and storage tanks in series. The tunnel 1 of the underpass has two approaches 2 in A and B directions on both sides. The regulation and storage tanks are arranged under the approaches 2. The regulation and storage tank is composed of a primary tank 3, an intermediate tank 4 and a final tank 5. The primary tank 3 is located at the top of the approach 2, and the final tank 5 is located at the bottom of the approach 2. A plurality of intermediate tanks 4 are connected in series between the primary tank 3 and the final tank 5. The regulation and storage tanks are arranged in a stepped manner on the approach 2. The regulation and storage tank with a higher position is a high regulation and storage tank, and the regulation and storage tank with a lower position is a low regulation and storage tank. A flow interception groove 6 is arranged on the approach 2 corresponding to each regulation and storage tank. The flow interception groove 6 is connected with the regulation and storage tank through a pipeline. A siphon pipe 7 and an overflow weir 8 are arranged between two connected regulation and storage tanks. A tunnel water inlet 9 is arranged at the two entrances of the tunnel 1. The tunnel water inlet 9 is connected with the final tank 5 through a pipeline. The final tank 5 on one side of the tunnel 1 is connected with the final tank 5 on the other side through a communication pipe 10. The surface runoff of the approach 2 is collected by the flow interception groove 6 and discharged into the regulation and storage tank. The regulation and storage tanks are connected in series through the siphon pipe 7 and the overflow weir 8. The rainwater collected in the regulation and storage tank is stored step by step and then discharged to the pump station 200 through a drainage pipe 11. The rainwater in the peak period of rainstorm is temporarily stored in the pump station 200 through peak-shaving regulation and storage, so as to reduce the flow discharged to the pump station 200 in the peak period of rainstorm and prevent the water inflow of the pump station 200 from exceeding the discharge capacity, thereby preventing the underpass from waterlogging. The plan view of the application is shown in Figure 1 , and the longitudinal section view is shown in Figure 2 .

[0047] The flow interception groove 6 is composed of two grooves connected in series at an angle of 90°. One groove is arranged in parallel with the center line of the road and close to the curb 12, and the other groove is arranged transversely on the outer lane of the approach 2. The plan view of the regulation and storage tank is shown in Figure 3 , Figure 3 The horizontal projection plan view of the regulation and storage tank above the approach 2 is shown in Figure 4 , Figure 4 is the 1-1 section of Figure 3 . Figure 3 and Figure 4 are both the drawings of the intermediate tank 4. The primary tank 3 and the final tank 5 can be referred to. Figure 3The plan view of the storage tank shows that one storage tank is provided with two groups of intercepting channels 6, one group on each side, but it is not limited to two groups, in order to more effectively collect the road surface rainwater, one storage tank can be provided with four groups or six groups of intercepting channels 6. The last stage tank 5 is not provided with overflow weirs 8 and cannot be used for storage, in fact, the last stage tank 5 plays a role of series connection and expansion of the volume with the pump station 200. The longitudinally arranged intercepting channels 6 are used to collect the rainwater along the edge of the curb stone 12, and the transversely arranged intercepting channels 6 are used to intercept the rainwater along the road surface of the approach 2, so as to reduce the rainwater flowing downstream along the slope. In order to better collect the rainwater of the road surface of the slope 2, the transversely arranged intercepting channels 6 on both sides can also be connected through the whole road surface, and the channel bottom is sloped to both sides. The intercepting channels 6 are connected to the water collecting well 13, the water collecting well 13 is arranged at the road shoulder between the curb stone 12 and the retaining wall 25, and the water collecting well 13 is connected to the storage tank through the water inlet pipe 14, the water inlet pipe 14 is connected to the water collecting well 13 from the side of the water collecting well 13 and is higher than the bottom of the water collecting well 13, the bottom of the water collecting well 13 forms a sedimentation groove, see Figure 4 The sediment in the rainwater flowing into the water collecting well 13 is deposited in the sedimentation groove, so as to reduce the sediment flowing into the storage tank. The rainwater grating is arranged on the intercepting channel 6 and is used to prevent larger objects such as leaves and paper scraps from entering the intercepting channel 6. The transversely arranged intercepting channel 6 is arranged on the carriageway, the rainwater grating is arranged in a type fixed with the road surface structure, does not shake under the rolling of the vehicle, guarantees the driving comfort, and should have sufficient strength. The rainwater grating of the longitudinally arranged intercepting channel 6 does not have the rolling of the vehicle, is arranged in an openable movable type, and is convenient for cleaning the accumulated objects. When the accumulated objects in the transversely arranged intercepting channel 6 are cleaned, the high-pressure water gun is used to flush the channel bottom from the gap of the rainwater grating, the accumulated objects are flushed to the longitudinally arranged intercepting channel 6 and the water collecting well 13, and the movable rainwater grating of the longitudinally arranged intercepting channel 6 and the cover plate of the water collecting well 13 are opened to clean out the accumulated objects.

[0048] The siphon 7 is arranged between two connected storage tanks, see Figure 4 The longitudinal section view of the storage tank. The siphon 7 is arranged on the left side L and the right side R of the storage tank, see Figure 5 The transverse section view of the storage tank, Figure 5 is Figure 3The siphon 7 is made of PE pipe or stainless steel pipe, and the pipe diameter is 300-600 mm, which is determined according to the volume of the storage tank and the drainage flow. The drainage of the storage tank of the present application adopts siphon drainage, and the reason for not using valve drainage is that, if valve drainage is used, an electric valve needs to be used to control the opening and closing of the valve, the electric valve is installed at the bottom of the storage tank, the valve for facilitating maintenance should be arranged in a dry chamber, a valve chamber needs to be specially arranged between two storage tanks, and a maintenance opening also needs to be arranged, so that the structure of the storage tank becomes complex, in addition, no matter whether a gate valve or a butterfly valve is used, the problem of poor sealing of the valve caused by the silt accumulation in rainwater exists. Therefore, the drainage of the storage tank of the present application adopts siphon drainage, and the drainage is achieved by the following way: a negative pressure main pipe 15 is arranged at the lower edge of the approach 2, the negative pressure main pipe 15 is made of PE pipe with DN40-DN50, hot melting joint, and is arranged under the shoulder between the curb 12 and the retaining wall 25 on both sides of the underpass, Figure 5 The dashed line represents the transverse communication pipe. The negative pressure main pipe 15 is connected with a negative pressure device 400, and the negative pressure device 400 is arranged in the pump station 200, as shown in Figure 5The negative pressure device 400 is composed of a vacuum pump 401 and a negative pressure tank 402. The vacuum pump 401 provides negative pressure, which is controlled by the control unit 300 to keep the negative pressure tank 402 with sufficient negative pressure. The negative pressure tank 402 is connected to the vacuum pump 401 at one port and to the negative pressure main pipe 15 at another port. The negative pressure tank 402 stores negative pressure gas and has the function of adjusting. The vacuum pump 401 does not need to be frequently started. The negative pressure tank 402 also has the function of draining water. The water existing in the negative pressure main pipe 15 is separated from the gas in the negative pressure tank 402, and the water will not enter the vacuum pump 401. The top of the siphon pipe 7 is provided with a negative pressure control pipe 16. The negative pressure control pipe 16 is connected to the negative pressure main pipe 15 through a negative pressure control valve 17. The negative pressure control pipe 16 is made of PE pipe with DN20~DN25 and hot melt joint. The negative pressure control pipe 16 is provided with a negative pressure release valve 18. The negative pressure control valve 17 and the negative pressure release valve 18 are electromagnetic valves. The top of the siphon pipe 7 is provided with a full water sensor 19. The full water sensor 19 is composed of two opposite insulated stainless steel contacts. When there is no water between the contacts, the resistance of the full water sensor 19 is infinite. When the siphon pipe 7 is full of water, the two contacts contact the water, and the resistance of the full water sensor 19 decreases greatly. The signal is transmitted to the control unit 300. When the inlet and outlet of the siphon pipe 7 are immersed in water during the storage of the surge tank, the control unit 300 controls the opening of the negative pressure control valve 17. Negative pressure is generated in the siphon pipe 7, and the water level in the pipe rises. When the water level rises to the top of the siphon pipe 7, the siphon is formed under the action of the gravity of water and atmospheric pressure. The water in the high-level surge tank is discharged into the low-level surge tank through the siphon pipe 7. The full water sensor 19 detects that the siphon pipe 7 is full of water, and the control unit 300 controls the closing of the negative pressure control valve 17. The siphon pipe 7 maintains siphon drainage. When it is necessary to stop drainage, the control unit 300 controls the opening of the negative pressure release valve 18. Air enters the siphon pipe 7 to destroy the siphon, and the siphon pipe 7 stops draining. See Figure 4 The left side L and the right side R of each surge tank are controlled by the control unit 300 respectively, which can be more flexible and convenient when setting the staggered peak regulation program. Figure 3 The 2-2 cross section is a stepped cross section, Figure 5 The left side shows the connection of the negative pressure main pipe 15, the negative pressure control pipe 16, the negative pressure control valve 17 and the negative pressure release valve 18 of the underpass, A is a local enlarged view. The negative pressure control valve 17 and the negative pressure release valve 18 are arranged in the maintenance hand hole 28. The maintenance hand hole 28 is arranged on the shoulder of the road on both sides, Figure 5 The right side shows the structure of the intercepting tank 6 and the catch basin 13. The control cables of the negative pressure control valve 17, the negative pressure release valve 18 and the full water sensor 19 are connected to the control unit 300 through PVC pipes.

[0049] The overflow weir 8 is arranged on the side of the high-level surge tank between two connected surge tanks, i.e. the downstream side of the surge tank. See Figure 4The height H of the overflow weir 8 from the bottom of the pool is the water storage depth. The deeper the water storage depth H, the larger the water storage volume of the storage pool, and the better the storage effect. The pool wall between the overflow weir 8 and the low-level storage pool is provided with an overflow port 20, as shown in Figure 4 a longitudinal section view of the storage pool, Figure 6 a horizontal section view of the storage pool, Figure 6 is Figure 4 a 3-3 section, which is a stepped section. The overflow ports 20 of the upstream and downstream of the storage pool are not on the same horizontal plane. The stepped section can display the overflow ports 20 of the upstream and downstream, Figure 6 display two overflow ports 20, but not limited to two, the number and aperture of the overflow ports 20 are determined according to the flow calculation. When the water storage of the high-level storage pool is higher than the top of the overflow weir 8, it flows into the low-level storage pool through the overflow port 20.

[0050] The downstream end of the primary pool 3 and the intermediate pool 4 is provided with a siphon inlet collection tank 21, and the downstream of the final pool 5 is not provided with a siphon 7. The inlet of the siphon 7 is 100-200 mm lower than the top of the siphon inlet collection tank 21. The upstream bottom of the intermediate pool 4 and the final pool 5 is provided with a siphon outlet collection tank 22, and the upstream of the primary pool 3 is not provided with a siphon 7. The outlet of the siphon 7 is 100-200 mm lower than the top of the siphon outlet collection tank 22. These settings are to ensure that when the siphon drainage of the storage pool is empty, the inlet and outlet of the siphon 7 are still submerged in water. When the water level of the siphon inlet collection tank 21 continues to decrease, the inlet of the siphon 7 leaks out of the water surface, the inlet of the siphon 7 enters the air siphon and is destroyed, and the storage pool stops draining. At this time, the outlet of the siphon 7 is still submerged in water in the siphon outlet collection tank 22, so that even if there is no water in the low-level storage pool, the outlet of the siphon 7 will not destroy the siphon, and the siphon drainage can still continue. The siphon inlet collection tank 21 and the siphon outlet collection tank 22 also have the function of a mud settling tank, which is convenient for dredging the storage pool.

[0051] The bottom of the upper bend of the siphon 7 is 50-100 mm higher than the top of the overflow weir 8, which can prevent the water from overflowing directly from the siphon 7 when the storage pool is full. A water level gauge 23 is arranged in the storage pool to control the peak-shaving storage according to the water level of the storage pool. A flow meter 24 is arranged on the drainage pipe 11 to control the peak-shaving storage according to the flow into the pump station 200.

[0052] The control unit 300 is shown in Figure 7The control unit 300 is composed of three parts, a flow meter module, a water level meter module, and a water full sensor module, which constitute a data input end, an operation module which is a data operation processor, a negative pressure control module and a siphon control module which constitute a control output end, and the operation module is connected with a monitoring terminal 500 which is used for setting peak-shaving storage parameters and implementing monitoring and storage state. The flow meter module has one input port, the water level meter module has the same number of input ports as the number of storage tanks, and the water full sensor module has the same number as the number of siphon pipes 7. The negative pressure control module and the siphon control module have the same number of control output ports as the number of siphon pipes 7.

[0053] In the implementation of the present application, the number and volume of the storage tanks should be reasonably set according to the length and slope of the approach 2 and the peak-shaving storage requirements. The new underpass can be constructed simultaneously with the storage tanks. If the storage tanks are added to the existing underpass, the underpass needs to be temporarily interrupted, and the steel sheet pile support measures are used to excavate the foundation pit to construct the storage tanks. In the process, the steel sheet piles (not shown in the figure) are arranged at the shoulder position between the two side kerbs 12 and the retaining walls 25 (i.e. the position of the water collecting well 13), the steel sheet piles should be driven to a depth lower than the storage tank, and the cross bracing is used to support between the two steel sheet piles. The storage tank is made of reinforced concrete, and each storage tank is provided with not less than two inspection wells 26 for maintenance and dredging of the storage tank, as shown in Figure 5 Figure 3 Figure 6 Due to the large span of the storage tank, structural columns 27 should be arranged in the tank, as shown in Figure 4 Figure 6 The wall thickness of the storage tank should be determined according to the load calculation.

[0054] Embodiment: The length of the approach 2 in two directions A and B on both sides of the underpass is 250m, the slope of the approach 2 is 4%, and 8 storage tanks are arranged under each approach 2 in each direction, the net length W of each storage tank is 25m, as shown in Figure 3 Figure 4 Figure 6 The approach 2 is a two-way 4-lane road with a road width of 16m, and the net width of the storage tank is 14m. The storage depth of the storage tank is H=3.5m, the overflow weir 8 has a 0.5m superhigh from the top to the bottom of the storage tank, and the net height of the storage tank is 4.0m. The effective volume of one storage tank is 25×14×3.5=1225m 3 The structural columns are arranged between the bottom plate and the top plate of the storage tank, the cross-sectional size of the structural column is 0.5×0.5m, and 9 structural columns are arranged in 3 rows and 3 columns in the storage tank, as shown in Figure 6 ​​​​​The thickness of the bottom plate, top plate and side wall is 0.5 m. The minimum covering of the storage tank should not be less than 0.7 m, which should be determined according to the thickness of the pavement structure of the approach 2, and in this case, 0.8 m. The height difference of the two storage tanks is (25+0.5) x 4% = 1.02 m, and the covering of the deeper side of the storage tank is 1.82 m. The total length of the eight storage tanks plus the nine wall thicknesses is 204.5 m. The existing underpass is a rainwater pipeline that collects rainwater along the road. The pipeline is discharged to the pump station on one side of the tunnel 1, and the rainwater pipeline on the other side of the tunnel 1 has already passed through the tunnel 1, i.e., the connecting pipe 10 and the drain pipe 11 already exist. When the present application is used, the bottom elevation of the last tank 5 should not be lower than the inner bottom of the original drain pipe 11 to ensure that the water in the last tank 5 can be discharged to the pump station 200 through the drain pipe 11. If necessary, the drop difference between the last tank 5 and the intermediate tank 4 of the upper level can be cancelled, or the series of storage tanks can be shifted towards the top of the approach 2. In this example, the length of the approach 2 is 250 m, the total length of the storage tanks is 204.5 m, the storage tanks are shifted by 40 m towards the top of the slope, the tank bottom elevation can be increased by 1.6 m, the drop difference between the last tank 5 and the intermediate tank 4 of the upper level can be cancelled by 1.0 m, the tank bottom elevation of the last tank 5 can be increased by 2.6 m, the original rainwater pipeline has a depth of generally 1.5-2.5 m, and the last tank 5 is connected to the drain pipe 11 by a newly built section of pipeline. This embodiment is only a reference case, and in actual implementation, the position of the last tank 5 and whether to cancel the drop difference should be determined according to the actual situation. If the tunnel 1 is 50 m long, 16 m wide and 4.5 m high, all of which are submerged in water, the water volume in the tunnel 1 is 3600 m 3 The slope of the approach 2 on both sides is 4%, the water accumulation length is 112.5 m, and the width between the retaining walls 27 is 19 m (16 m of carriageway + 1.5 m of shoulder on both sides). The water accumulation of the approach 2 on both sides is 9618.75 m 3 The total water accumulation of the underpass is 13218.75 m 3 Excluding the last tank 5, the 14 storage tanks can store 15750 m 3 of water, which can accommodate the water depth of the entire submerged tunnel 1. This embodiment is only a calculation of the volume of the storage tanks, compared with the volume of the water filled in the tunnel 1. Before and after the rainfall peak, the rainwater that does not exceed the discharge capacity of the pump station 200 is discharged in time and does not accumulate in the storage tanks. During the rainfall peak, the rainwater that exceeds the discharge capacity of the pump station 200 is temporarily stored in the storage tanks through dynamic regulation and storage. Therefore, the number and volume of the storage tanks should be determined according to the local rainfall pattern, the terrain of the underpass, the drainage pump station and other factors.

[0055] The regulating and storing method of the underpass channel staggered peak regulation and storage anti-flood system is a method of dynamic regulating and storing according to water depth and flow. In the whole rainfall process, the flow of the regulating and storing pool into the pump station 200 is dynamically adjusted according to the rainfall. When the rainfall is small in the early stage of rainfall, the water collected in the regulating and storing pool is discharged into the pump station 200, so as to reduce the water storage in the regulating and storing pool. When the rainfall increases, the flow of the water in the regulating and storing pool discharged into the pump station 200 is reduced. When the rainfall reaches the peak, the flow of the regulating and storing pool discharged into the pump station 200 is controlled to be not more than the designed drainage capacity of the pump station 200. After the rainfall peak, the rainfall decreases, and then the water in the regulating and storing pool is discharged into the pump station 200, so as to achieve the purpose of staggered peak regulation and storage. The regulating and storing steps are as follows:

[0056] a. Parameter setting. According to the designed flow Q of the pump station 200, a threshold value E is set for the control unit 300 through the monitoring terminal 50. The threshold value E is 0.5-0.8. The threshold flow is EQ. The actual flow actually detected by the flow meter 24 is Qc. A first water level h1 and a second water level h2 are set for each regulating and storing pool through the monitoring terminal 50 for the control unit 300. Generally, h1 is 0.3-1.0 m, and h2 is 0.4-0.6 times H;

[0057] b. In the early stage of rainfall, the rainfall is small. The rainwater collected in the intercepting groove 6 connected with the primary pool 3 and the intermediate pool 4 is stored in the pool. The rainwater collected in the intercepting groove 6 connected with the final pool 5 and the tunnel water inlet 9 is stored in the pool. At this time, the rainwater in the water collection range of the final pool 5 in the underpass channel is discharged to the pump station 200 through the drainage pipe 11. The flow is small;

[0058] c. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary pool 3 and the intermediate pool 4 on the A and B directions is greater than h1, the L side siphon pipe 7 siphons and discharges the water in the pool to the lower regulating and storing pool. The primary pool 3 and the intermediate pool 4 are sequentially discharged. After the water is discharged to the final pool 5, the water is discharged to the pump station 200 through the drainage pipe 11;

[0059] d. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary pool 3 and the intermediate pool 4 is greater than h2, the R side siphon pipe 7 siphons and discharges the water. The double pipes are used to accelerate the discharge of the water;

[0060] e. In the state of step d, if the rainfall does not continuously increase, when the water level h of any one of the intermediate pools 4 is less than h1, and the water depth Z of the pool is less than the water depth Z of the upper regulating and storing pool, the L side siphon pipe 7 stops discharging the water, the R side siphon pipe 7 continues to discharge the water, and the double side discharge is changed into single side discharge;

[0061] f. In the state of step d double side discharge, if the rainfall increases, when the actual flow Qc is greater than the threshold flow EQ, and the actual flow Qc is less than the designed flow Q, the double side siphon pipe 7 continues to discharge the water;

[0062] g. When the rainfall continues to increase, and the actual flow Qc > the design flow Q, the siphon 7 of the A-direction guide 2 stops draining, and the rainwater is stored in the regulating reservoir, and the B-direction guide 2 continues to drain the lower regulating reservoir, at this time, the flow drained to the pump station 200 is reduced by half;

[0063] h. When the rainfall reaches the peak, the A-direction guide 2 stops draining, and when the actual flow Qc < the design flow Q, the A-direction regulating reservoir continues to store water, and the B-direction regulating reservoir continues to drain, when the water level h of any one of the A-direction regulating reservoirs is greater than or equal to H, the A-direction and the B-direction are exchanged, the B-direction regulating reservoir stores water, and the A-direction regulating reservoir drains water;

[0064] i. When the rainfall reaches the peak, and the actual flow Qc > the design flow Q, the regulating reservoirs of the A-direction and the B-direction both stop draining, and all the primary reservoirs 3 and the intermediate reservoirs 4 enter the water storage state, and the rainwater in the range of the final reservoir 5 is drained to the pump station 200;

[0065] j. After the rainfall peak, the rainfall gradually decreases, the siphon 7 of the A-direction and the B-direction regulating reservoirs is opened to drain, and the actual flow Qc is controlled to be greater than the threshold flow EQ and less than the design flow Q;

[0066] k. After the rainfall ends, if there is water stored in the regulating reservoir, the siphon 7 of the A-direction and the B-direction regulating reservoirs continues to drain, and the actual flow Qc is controlled to be greater than the threshold flow EQ and less than the design flow Q, so that the stored water is drained, and the next rainfall regulation and storage is facilitated.

[0067] The peak-shifting regulation and flood control system of the application reduces the occurrence of the underpass channel waterlogging, and achieves the actual flow Qc not exceeding the design discharge by temporarily storing the rainwater in the regulating reservoir when the rainstorm intensity reaches the peak, and the rainwater peak-shifting regulation and storage schematic diagram is shown in Figure 8 The above method is only a combination of a regulation and storage method, and many different combinations of regulation and storage methods can be obtained according to the rain type of different regions and the setting of the regulating reservoir. The rain type is different in different regions, generally, the rainfall with a duration of 120 minutes has a peak value in 30-60 minutes, and when the regulation and storage method is designed, the regulation and storage parameters should be reasonably set according to the local rain type and meteorological forecast data. The drainage design of the underpass channel generally performs the drainage pipeline and the design pump station according to the rainstorm intensity with a return period of 5-10 times, according to the above embodiment, the siphon drainage is not used during the rainfall process, and only the water storage of the regulating reservoir is relied on, and the water storage of the water storage reservoir is slowly drained after the rainfall stops, so that the flood control system can be improved to 20-50 years per occurrence, and according to the above method, the dynamic regulation and storage can be performed, so that the flood control system can be improved to 50-100 years per occurrence, or even higher.

[0068] The specification and drawings of the application are only specific embodiments, not restrictive, and those skilled in the art can make many forms under the inspiration of the application without departing from the scope of the application, which are all within the protection scope of the application.

Claims

1. A peak-shaving and flood-control system for an underpass, characterized in that: it includes a regulating... The storage unit (100), the pump station (200), the control unit (300); the storage unit (100) is composed of a plurality of storage ponds in series, the storage ponds are respectively arranged at the lower approaches (2) on both sides of the tunnel (1) of the underpass, arranged in a ladder shape, the storage ponds are arranged into two groups according to the lower approaches on both sides A and B of the tunnel (1), each group is composed of a primary pond (3), an intermediate pond (4) and a final pond (5), the primary pond (3) is located at the top of the slope of the lower approach (2), the final pond (5) is located at the bottom of the slope of the lower approach (2), a plurality of intermediate ponds (4) are connected in series between the primary pond (3) and the final pond (5); a flow interception groove (6) is arranged on the lower approach (2) corresponding to each storage pond, the flow interception groove (6) is communicated with the storage pond through a pipeline, a tunnel water inlet (9) is arranged at the entrance of the tunnel (1), the tunnel water inlet (9) is communicated with the storage unit (100) through a pipeline, a siphon pipe (7) and an overflow weir (8) are arranged between two connected storage ponds, the storage ponds are connected in series through the siphon pipe (7) and the overflow weir (8); the siphon pipe (7) is arranged on both sides of two adjacent storage ponds in two ways, namely left side L and right side R, a negative pressure main pipe (15) is arranged along the line below the lower approach (2) and is connected with a negative pressure device (400), a negative pressure control pipe (16) is arranged at the top of the siphon pipe (7), the negative pressure control pipe (16) is connected with the negative pressure main pipe (15) through a negative pressure control valve (17), a negative pressure relief valve (18) is arranged on the pipe section of the negative pressure control pipe (16), a full water sensor (19) is arranged at the top of the siphon pipe (7); the pump station (200) is communicated with the storage unit (100) through a drainage pipe (11); the control unit (300) is used for dynamically controlling the flow rate of the storage pond into the pump station.

2. The system according to claim 1, wherein the system is characterized in that: The control unit (300) is composed of a flow meter module, a water level meter module and a full water sensor module to form a data input end, an operation module is a data operation processor, a negative pressure control module and a siphon control module form a control output end, the operation module is connected with a monitoring terminal (500), and the monitoring terminal (500) is used for setting peak-shifting storage parameters and implementing monitoring of the storage state.

3. The system according to claim 1, wherein the system is characterized in that: The tunnel water inlets (9) are two, which are respectively arranged at the two entrances of the tunnel (1), the tunnel water inlets (9) are communicated with the final ponds (5) through pipelines, and the final ponds (5) of the two groups of storage ponds are communicated through a communication pipe (10).

4. The underpass peak-shifting regulation and flood control system according to claim 1, characterized in that: The flow interception groove (6) is two grooves in one group, which are connected in a "∟" shape at an angle of 90°, one groove is arranged longitudinally along the curb (12) parallel to the center line of the road, and the other groove is arranged transversely in the outer lane on both sides of the lower approach (2) perpendicular to the center line of the road, the flow interception groove (6) is connected with a water collecting well (13) through a water inlet pipe (14) and connected with the storage pond.

5. The system according to claim 1, wherein the system is characterized in that: The siphon drainage is adopted for the drainage of the storage pond, the storage pond is poured with reinforced concrete, and no less than two inspection wells (26) are arranged in each storage pond.

6. The underpass peak-shifting regulation and flood control system according to claim 1, characterized in that: The overflow weir (8) is arranged on the side of the high-level storage tank between two connected storage tanks, the height H of the top of the overflow weir (8) from the bottom of the tank is the water storage depth, the tank wall between the overflow weir (8) and the low-level storage tank is provided with an overflow port (20), and when the water storage of the high-level storage tank is higher than the top of the overflow weir (8), the water overflowing the overflow weir (8) flows into the low-level storage tank through the overflow port (20).

7. The underpass peak-shifting regulation and flood control system according to claim 1, characterized in that: The downstream end bottom of the primary tank (3) and the intermediate tank (4) is provided with a siphon inlet water collecting groove (21), the inlet of the siphon pipe (7) is lower than the top of the siphon inlet water collecting groove (21) by 100-200 mm, and the upstream bottom of the intermediate tank (4) and the final tank (5) is provided with a siphon outlet water collecting groove (22), and the outlet of the siphon pipe (7) is lower than the top of the siphon outlet water collecting groove (22) by 100-200 mm.

8. The underpass peak-shifting regulation and flood control system according to claim 1, characterized in that: The bottom of the upper elbow of the siphon pipe (7) is higher than the top of the overflow weir (8) by 50-100 mm.

9. The underpass peak-shifting regulation and flood control system according to claim 1, characterized in that: The water level meter (23) is arranged in the storage tank, and the flow meter (24) is arranged on the drain pipe (11).

10. The peak-regulation method of the underpass peak-regulation system according to any one of claims 1-9, characterized in that During the whole rainfall process, the flow of the storage tank into the pump station (200) is dynamically adjusted according to the rainfall, when the rainfall is small in the early stage of rainfall, the water collected in the storage tank is discharged into the pump station (200), thereby reducing the water storage in the storage tank, when the rainfall increases, the flow of the water in the storage tank into the pump station (200) is reduced, when the rainfall reaches the peak, the flow of the water in the storage tank into the pump station (200) is controlled to be not more than the designed discharge capacity of the pump station (200), after the rainfall peak, the rainfall decreases, and then the water in the storage tank is discharged into the pump station (200), thereby realizing peak-shifting storage, and the specific storage steps are as follows: a. Parameter setting, according to the designed flow Q of the pump station (200), the control unit (300) sets a threshold value E, the threshold flow is EQ, the actual flow detected by the flow meter (24) is Qc, and the control unit (300) sets a first water level h1 and a second water level h2 for each storage tank; b. In the early stage of rainfall, the rainfall is small, the rainwater collected by the intercepting groove (6) connected with the primary tank (3) and the intermediate tank (4) is stored in the tank, the rainwater collected by the intercepting groove (6) connected with the final tank (5) and the tunnel water inlet (9) is discharged into the tank, and the water is discharged to the pump station (200) through the drain pipe (11); c. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary tank (3) and the intermediate tank (4) on the A and B directions is greater than h1, the siphon pipe (7) on the L side siphons and discharges water, the water in the tank is discharged to the lower storage tank, and the primary tank (3) and the intermediate tank (4) are sequentially discharged, and the water is discharged to the pump station (200) through the drain pipe (11) after being discharged to the final tank (5); d. When the actual flow Qc is less than the threshold flow EQ, and the water level h of any one of the primary tank (3) and the intermediate tank (4) is greater than h2, the siphon pipe (7) on the R side siphons and discharges water, and double pipes are used to accelerate water discharge. e. In step d, if the rainfall continues to increase, when the water level h of any one intermediate pool (4) decreases to h < h1, and the water depth Z of the pool < the water depth Z of the upper regulating pool, the L-side siphon (7) stops draining, the R-side siphon (7) continues to drain, and the two-side draining is changed to one-side draining; f. In step d, if the rainfall continues to increase, when the actual flow Qc > the threshold flow EQ, and the actual flow Qc < the design flow Q, the two-side siphon (7) continues to drain; g. If the rainfall continues to increase, when the actual flow Qc > the design flow Q, the siphon (7) of the A-direction approach channel (2) regulating pool stops draining, and the rainwater is stored in the regulating pool, and the siphon (7) of the B-direction approach channel (2) lower regulating pool continues to drain; h. When the rainfall reaches the peak, when the actual flow Qc < the design flow Q, the A-direction regulating pool continues to store water, and the siphon (7) of the B-direction regulating pool drains, when the water level h of any one A-direction regulating pool is ≥ H, and the pool is full of overflow, the A and B directions are exchanged, the B-direction regulating pool stores water, and the siphon (7) of the A-direction regulating pool drains; i. When the rainfall reaches the peak, when the actual flow Qc > the design flow Q, the siphons (7) of the A and B direction regulating pools both stop draining, and all the primary pools (3) and intermediate pools (4) enter the water storage state, and the rainwater in the range of the final pool (5) is drained into the pump station (200); j. After the rainfall peak, the rainfall gradually decreases, the siphons (7) of the A and B direction regulating pools are opened to drain, and the draining is controlled within the range of the actual flow Qc > the threshold flow EQ, and the actual flow Qc < the design flow Q; k. After the rainfall ends, if there is stored water in the regulating pool, the siphons (7) of the A and B direction regulating pools continue to drain, and the draining is controlled within the range of the actual flow Qc > the threshold flow EQ, and the actual flow Qc < the design flow Q, so as to empty the stored water for the next rainfall regulation.

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