Automatic rainwater storage and discharge system for viaducts in sponge city in hilly areas

Abstract

The application discloses a kind of high-level bridge rainwater automatic storage and drainage systems suitable for hilly area sponge city, comprising: water storage system, water storage system includes water storage tank, water storage tank is connected with bridge drain pipe, under the action of gravitational potential energy, water in bridge drain pipe automatically enters water storage tank;Drainage system, water storage tank and green belt irrigation system are connected, under the action of gravitational potential energy, water in water storage tank automatically enters irrigation system;Rainwater diversion system, including rainwater diversion pond, water storage tank and bridge drain pipe are connected, rainwater diversion pond is provided with overflow, and overflow is provided with pressure control component, when water level in water storage tank reaches set water level, under the action of water pressure difference, pressure control component is automatically opened, so that rainwater enters municipal pipe network;The present application utilizes the height difference advantage between viaduct, cutting slope and ground green belt, converts the gravitational potential energy of rainwater into the kinetic energy of rainwater storage and drainage, and can realize the collection and utilization of rainwater with zero energy consumption.

Description

Technical Field

[0001] This invention relates to the field of automatic rainwater storage and drainage technology, specifically to an automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas. Background Technology

[0002] With high traffic volume and limited land resources on both sides of existing roads, elevated bridges are widely used in urban roads to alleviate traffic pressure. Currently, most elevated bridge stormwater systems in China adopt diversion systems, diverting rainwater through pipes to drainage systems laid under the ground-level auxiliary roads. On the one hand, plants in the green belts under the elevated bridges do not receive natural rainwater and require regular watering; on the other hand, rainwater from the bridge surface flows directly into the road drainage system, failing to fully utilize the rainwater on the bridge, resulting in a waste of natural resources and increasing the pressure on the municipal pipe network.

[0003] With the development of sponge cities, water conservation has become an inevitable trend. Rainwater, as a natural and high-quality water resource, can alleviate water pressure and reduce the load on municipal pipe networks if collected from bridge surfaces and used for irrigation of green spaces and roads. Currently, the most common approach is to install rainwater storage tanks in the central green belts under elevated bridges. Rainwater collected from the elevated bridge's rainwater pipes is filtered and then stored in these tanks. Pumps are then activated for irrigation of green spaces and roads when needed. For example, invention patent application number 201610158090.6 discloses a rainwater storage and irrigation system for green belts under elevated bridges. This system utilizes rainwater resources to some extent and reduces road maintenance costs. However, it increases the additional load on roads, bridges, and other structures, affecting structural safety and lifespan. Furthermore, the system requires electrical equipment such as pumps to utilize the water source, resulting in high initial costs and subsequent operation and management expenses.

[0004] Therefore, considering the characteristics of hilly areas with many road cuts, the applicant proposes an automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas. By utilizing the height advantage of elevated bridges, the system converts gravitational potential energy into kinetic energy for rainwater storage and drainage, achieving rainwater collection and utilization with zero energy consumption. This system can effectively regulate and utilize rainwater resources while reducing the operation and maintenance costs of urban roads, thus greatly contributing to the construction of sponge cities. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas. By utilizing the height advantage of elevated bridges, the system converts gravitational potential energy into kinetic energy for rainwater storage and drainage, achieving rainwater collection and utilization with zero energy consumption. This system can effectively regulate and utilize rainwater resources while reducing the operation and maintenance costs of urban roads, thus greatly contributing to the construction of sponge cities.

[0006] To achieve the above objectives, an automatic rainwater storage and drainage system for elevated bridges, suitable for sponge city projects in hilly areas, is provided. This system includes an elevated bridge and a green belt irrigation system. The elevated bridge deck is equipped with drainage outlets connected to bridge drainage pipes. The system also includes:

[0007] A water storage system, comprising a water storage tank connected to a bridge drainage pipe, wherein water in the bridge drainage pipe can automatically enter the water storage tank under the action of gravitational potential energy;

[0008] The drainage system is connected to the water storage tank and the green belt irrigation system. Under the action of gravitational potential energy, the water in the water storage tank automatically enters the green belt irrigation system through the drainage system.

[0009] The rainwater diversion system includes a rainwater diversion pool connected to a water storage tank and a bridge drainage pipe. The rainwater diversion pool is equipped with an overflow outlet and a pressure control component at the overflow outlet. When the water level in the water storage tank reaches the set water level, the pressure control component is automatically opened under the action of water pressure difference, allowing the water in the rainwater diversion pool to enter the municipal pipe network.

[0010] Furthermore, it also includes the road cut slope and green belt. The water storage tank is set on the road cut slope, and the upper end of the water storage tank is lower than the drainage outlet of the viaduct, while the lower end is higher than the green belt.

[0011] Furthermore, the height difference between the upper end of the water storage tank and the drainage outlet of the elevated bridge deck is H1, and the height difference between the lower end and the green belt is H2; the potential energy of the height difference H1 can cause the rainwater from the elevated bridge to automatically fill the water storage tank, and the potential energy of the height difference H2 can cause the rainwater in the water storage tank to automatically drain into the green belt irrigation system.

[0012] Furthermore, an exhaust pipe is provided on the top of the water storage tank, and the height difference between the upper end of the exhaust pipe and the upper end of the water storage tank is greater than H1.

[0013] Furthermore, the water storage system also includes an inlet pipe, the lower end of which is connected to the rainwater diversion pool and the upper end of the water storage tank, and the water inlet of the water storage tank is located at or near the upper end of the water storage tank.

[0014] Furthermore, a sedimentation baffle is installed inside the water storage tank near the water inlet, and a drain outlet is installed at the bottom of the water storage tank. The drain outlet is located between the water inlet of the water storage tank and the sedimentation baffle, and a drain valve is installed at the drain outlet.

[0015] Furthermore, the drainage system includes a drainage pipe and a drainage valve installed on the drainage pipe. The upper end of the drainage pipe is connected to the bottom of a water storage tank, and the lower end is connected to a green belt irrigation system.

[0016] Furthermore, the rainwater diversion pool is located below the central green belt under the viaduct, and the lower end of the bridge drainage pipe is connected to the upper end of the rainwater diversion pool.

[0017] Furthermore, the pressure control component has an inlet end and an outlet end, which connect to form a diversion channel. The inlet end of the pressure control component is connected to the overflow outlet of the rainwater diversion tank, and the outlet end is connected to the municipal pipe network. The pressure control component also has a pressure control valve, which includes a pressure control spring and a water-blocking element connected to the pressure control spring. The water-blocking element blocks the diversion channel under the action of the pressure control spring, so that the inlet end and the outlet end of the pressure control component are not connected. When the water level in the storage tank reaches the set water level, under the action of the water pressure difference, the water in the rainwater diversion tank overcomes the elastic force of the pressure control spring and pushes the water-blocking element to move a certain distance H3, so that the inlet end and the outlet end of the pressure control component are connected, and the water in the rainwater diversion tank enters the municipal pipe network through the diversion channel.

[0018] Furthermore, the pressure control assembly also includes an overflow pipe, the pressure control valve also includes an L-shaped pipe, the water-blocking element includes a piston, a piston rod, and a water-stop plate, one end of the horizontal section of the L-shaped pipe is the water inlet of the pressure control assembly, and is connected to the overflow port of the rainwater diversion tank; the pressure control spring is vertically disposed at one end of the vertical section of the L-shaped pipe; the upper end of the piston rod is connected to the piston, and the lower end is connected to the water-stop plate, the piston is connected to the lower end of the pressure control spring, and the water-stop plate is located at... In the vertical section of the L-shaped pipe, a sealing structure is provided between the waterstop plate and the inner wall of the vertical section of the L-shaped pipe. This sealing connection is used to prevent water leakage between the waterstop plate and the inner wall of the vertical section of the L-shaped pipe. A diversion port is provided on the vertical section of the L-shaped pipe. One end of the overflow pipe is connected to the diversion port, and the other end of the overflow pipe is the outlet of the pressure control component, which is connected to the municipal pipe network. When the waterstop plate is not under water pressure, the vertical distance between the lower end face of the waterstop plate and the lower end of the diversion port is H3.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention utilizes the elevation difference between overpasses, road cut slopes, and green belts on the ground to convert the gravitational potential energy of rainwater into the kinetic energy of rainwater storage and drainage, achieving rainwater collection and utilization with zero energy consumption.

[0021] 2. This invention has a simple structure, requires no supporting electrical equipment, has low investment costs and low subsequent operation and management costs, and provides great assistance to the construction of sponge cities.

[0022] 3. The present invention is equipped with a rainwater diversion tank, which is controlled by a pressure control component and can automatically realize the conversion of rainwater flow direction with zero energy consumption, ensuring that excess rainwater can be discharged in a timely and effective manner. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the water storage system of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure connecting the rainwater diversion tank and the pressure control component of the present invention;

[0025] Figure 3 This is a schematic diagram of the pressure control component of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the water storage tank of the present invention;

[0027] Figure 5 This is a schematic diagram of the drainage system of the present invention.

[0028] Attached reference numerals: 1-1, viaduct; 1-2, ground auxiliary road; 1-3, road cut slope; 1-4, green belt; 2-1, bridge drainage pipe; 2-2, rainwater diversion pool; 2-3, inlet pipe; 2-4, water storage tank; 2-4-1, sedimentation baffle; 2-4-2, sewage outlet; 2-4-3, vent pipe; 2-5, pressure control component; 2-5-1, overflow pipe; 2-5-2, pressure control valve; 4-1, pressure control spring; 4-2, piston; 4-3, piston rod; 4-4, waterstop plate; 3-1, drainage pipe. Detailed Implementation

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0031] like Figure 1 and Figure 5 As shown, the elevated bridge and its surrounding facilities in the sponge city of the hilly area include the elevated bridge 1-1, the ground-level auxiliary road 1-2, the road cutting slope 1-3, and the green belt 1-4. Green belts 1-4 are located on both sides of the ground-level auxiliary road 1-2; one is a slope green belt located between the lower end of the road cutting slope 1-3 and the ground-level auxiliary road 1-2, and the other is a central green belt located directly below the elevated bridge 1-1. The green belt 1-4 has an irrigation system, and drainage outlets are provided on the bridge deck of the elevated bridge 1-1, connected to bridge drainage pipes 2-1.

[0032] like Figures 1-5 As shown, an automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas includes the aforementioned elevated bridge and its surrounding facilities, as well as a rainwater diversion pool 2-2, a water storage tank 2-4, an inlet pipe 2-3, a pressure control component 2-5, and a drainage pipe 3-1.

[0033] like Figure 1 As shown, the rainwater diversion tank 2-2 is located directly below the central green belt beneath the viaduct 1-1. The upper end of the rainwater diversion tank 2-2 is connected to the lower end of the bridge drainage pipe 2-1, and rainwater collected by the bridge drainage pipe 2-1 first enters the rainwater diversion tank 2-2. To reduce solid impurities in the rainwater entering the rainwater diversion tank 2-2, a filter device can be installed at a suitable location on the bridge drainage pipe 2-1. A suitable location means it is above ground level at an appropriate height, such as within 2 meters of the ground, for easy maintenance and replacement. An overflow outlet is located near the upper end of the side wall of the rainwater diversion tank 2-2, and a pressure control component 2-5 is installed at the overflow outlet. The pressure control component 2-5 is connected to the municipal pipe network.

[0034] like Figure 1 , Figure 2 and Figure 4As shown, water storage tank 2-4 is installed on the road cut slope 1-3, with its upper end lower than the drainage outlet of the viaduct 1-1 and its lower end higher than the green belt 1-4, and also higher than the rainwater diversion pool 2-2. Water storage tank 2-4 has an inlet and an outlet. The inlet is located on the upper part of the side wall of water storage tank 2-4 or near the upper part of the side wall, and the outlet is located at the bottom of water storage tank 2-4. The lower end of the inlet pipe 2-3 is connected to the upper part of the side wall of the rainwater diversion pool 2-2, and the upper end is connected to the inlet of water storage tank 2-4. The height difference between the upper end of water storage tank 2-4 and the drainage outlet of the viaduct 1-1 is H1, and the height difference between the lower end of water storage tank 2-4 and the green belt 1-4 is H2. The potential energy of the height difference H1 allows rainwater from the elevated bridge 1-1 to automatically fill the water storage tank 2-4, while the potential energy of the height difference H2 allows rainwater in the water storage tank 2-4 to automatically drain into the green belt irrigation system. Although the actual height of the elevated bridge 1-1 is not a fixed value, given the presence of a ground-level auxiliary road 1-2 beneath it, which carries vehicles, the height of the elevated bridge 1-1 is generally over 3 meters, with some higher elevated bridges reaching over 10 meters. H1 and H2 do not need to be very large; they can range from tens of centimeters to several meters, calculated and selected based on the actual situation. The rainwater diversion pool 2-2 and the inlet pipe 2-3 connect the bridge drainage pipe 2-1 and the water storage tank 2-4, allowing the water storage tank 2-4 to be connected to the bridge drainage pipe 2-1. Under the influence of gravitational potential energy, water in the bridge drainage pipe 2-1 can automatically enter the water storage tank 2-4. In addition, the water inlet pipe 2-3 passes under the roadbed of the ground auxiliary road 1-2 and under the green belt 1-4 and connects to the rainwater diversion pool 2-2. It is also laid along the slope 1-3 and connected to the inlet of the water storage tank 2-4, which can effectively prevent the water inlet pipe 2-3 from being damaged and effectively ensure the safety of the water inlet pipe 2-3.

[0035] like Figure 4As shown, a vent pipe 2-4-3 is installed on the top of the water storage tank 2-4. The height difference between the upper end of the vent pipe 2-4-3 and the upper end of the water storage tank 2-4 is greater than H1. This controls the water level in the water storage tank 2-4 and prevents rainwater from overflowing from the vent pipe 2-4-3. A sedimentation baffle 2-4-1 is installed inside the water storage tank 2-4 near the inlet. The sedimentation baffle 2-4-1 can be fixed or detachable, such as by insertion or bolt connection. The sedimentation baffle 2-4-1 divides the lower interior of the water storage tank 2-4 into a sedimentation zone and a clean zone. The area between the sedimentation baffle 2-4-1 and the side wall where the water inlet of the water storage tank 2-4 is located is the sedimentation zone, and the other side of the sedimentation baffle 2-4-1 is the clean zone. The drain outlet of the water storage tank 2-4 is located in the clean zone. A drain outlet 2-4-2 is located at the bottom of the water storage tank 2-4, between the water inlet and the sedimentation baffle 2-4-1. Specifically, the drain outlet 2-4-2 is situated within the sedimentation zone, and a drain valve is installed at the drain outlet 2-4-2. The sedimentation baffle 2-4-1 facilitates further sedimentation and filtration of rainwater, and the drain outlet 2-4-2 at the bottom of the sedimentation zone allows for the periodic removal of sediment from the water storage tank 2-4.

[0036] like Figure 5 As shown, the drain outlet of water storage tank 2-4 is connected to drain pipe 3-1, and a drain valve is installed at the upper end of drain pipe 3-1. Drain pipe 3-1 is laid along slope 1-3 and passes under the roadbed of auxiliary road 1-2 and under green belt 1-4, connecting to the green belt irrigation system. This effectively prevents damage to drain pipe 3-1 and ensures its safety. Alternatively, drain pipe 3-1 may not have a drain valve; drainage is controlled by the valve of the green belt irrigation system itself. When green belt 1-4 needs to be irrigated, the valve is opened, and automatic drainage and irrigation are performed using the gravitational potential energy of the height difference H2.

[0037] like Figure 2 and Figure 3As shown, the pressure control assembly 2-5 includes a pressure control valve 2-5-1 and an overflow pipe 2-5-2. The pressure control valve 2-5-1 includes an L-shaped pipe, a pressure control spring 4-1, and a water-blocking element connected to the pressure control spring 4-1. One end of the horizontal section of the L-shaped pipe is the water inlet of the pressure control assembly 2-5, which is connected to the overflow port of the rainwater diversion tank 2-2. The pressure control spring 4-1 is vertically installed at one end of the vertical section of the L-shaped tube. The water-blocking element includes a piston 4-2, a piston rod 4-3, and a water-stop plate 4-4. The upper end of the piston rod 4-3 is connected to the piston 4-2, and the lower end is connected to the water-stop plate 4-4. The piston 4-2 is connected to the lower end of the pressure control spring 4-1. The water-stop plate 4-4 is located in the vertical section of the L-shaped tube, and a sealing structure is provided between the water-stop plate 4-4 and the inner wall of the vertical section of the L-shaped tube. This sealing connection is used to prevent water leakage between the water-stop plate 4-4 and the inner wall of the vertical section of the L-shaped tube. The sealing structure can have various forms, such as a rubber sleeve fitted on the water-stop plate 4-4, or an annular groove provided on the outer cylindrical wall of the water-stop plate 4-4, in which a rubber sealing ring is provided. This annular groove and the rubber sealing ring therein also constitute a sealing structure. There are other types of sealing structures, which will not be listed here. In addition to the structure described above, the water-blocking element can also have other structures, such as a large cylindrical piston.

[0038] like Figure 2 and Figure 3As shown, the vertical section of the L-shaped pipe is equipped with a diversion port. One end of the overflow pipe 2-5-2 is connected to the diversion port, and the other end of the overflow pipe 2-5-2 is the outlet of the pressure control component 2-5, which is connected to the municipal pipe network. The vertical section of the L-shaped pipe is connected to the overflow pipe 2-5-2 through the diversion port, forming a diversion channel. When the waterstop plate 4-4 is not under water pressure, the vertical distance between the lower end face of the waterstop plate 4-4 and the lower end of the diversion port is H3. At this time, the waterstop plate 4-4 completely blocks the diversion channel, so that the inlet and outlet ends of the pressure control component 2-5 are not connected, thus preventing the vertical section of the L-shaped pipe from connecting with the overflow pipe 2-5-2. As the water level in the rainwater diversion tank 2-2 exceeds the height of the waterstop plate 4-4, the waterstop plate 4-4 begins to bear water pressure. As the water level in the storage tank 2-4 rises, the pressure difference on the waterstop plate 4-4 increases, overcoming the elastic force of the pressure control spring 4-1 and pushing the waterstop plate 4-4 upwards. When the pressure difference reaches a height exceeding H3, the waterstop plate 4-4 will no longer completely block the diversion channel, and water in the rainwater diversion tank 2-2 can flow into the municipal pipe network through the diversion channel. The pressure difference that allows the waterstop plate 4-4 to be pushed upwards to a height exceeding H3 is related to the water level in the storage tank 2-4; this water level is called the set water level. When the water level in the storage tank 2-4 reaches the set water level, the pressure control component 2-5 automatically opens under the action of the pressure difference, allowing water in the rainwater diversion tank 2-2 to enter the municipal pipe network. The height of the water level setting varies depending on the specifications of the pressure control spring 4-1 and the structure of the water tank 2-4. By setting it reasonably, it is preferable to make the water level setting the same as the height of the water inlet of the water tank 2-4, so as to maximize the use of the water tank 2-4.

[0039] The working principle of this invention is as follows: Utilizing the height advantage of the elevated bridge 1-1, the height of the water storage tank 2-4 is rationally positioned to convert the gravitational potential energy of rainwater on the bridge surface of the elevated bridge 1-1 into kinetic energy. This allows the rainwater on the bridge surface to automatically enter the water storage tank 2-4 sequentially through the bridge drainage pipe 2-1, the rainwater diversion pool 2-2, and the inlet pipe 2-3. The water storage tank 2-4 is connected to the green belt irrigation system via the drainage pipe 3-1. When irrigation of the green belt 1-4 is required, the valve is opened, converting the gravitational potential energy of the rainwater in the water storage tank 2-4 into kinetic energy, which then automatically flows through the drainage pipe 3-1 into the green belt irrigation system, automatically irrigating the green belt 1-4. The rainwater diversion pool 2-2 is equipped with an overflow outlet, which is connected to the municipal pipe network via a pressure control component 2-5. When the water level in the water storage tank 2-4 is too high or even about to overflow, the rainwater in the rainwater diversion pool 2-2 will automatically open the pressure control component 2-5 under the action of water pressure difference, so that the water in the rainwater diversion pool 2-2 will automatically enter the municipal pipe network.

[0040] In summary, this invention utilizes the elevation difference between the elevated bridge 1-1, the road cut slope 1-3, and the green belt 1-4 on the ground to convert the gravitational potential energy of rainwater into the kinetic energy for rainwater storage and drainage, achieving rainwater collection and utilization with zero energy consumption. Furthermore, this invention has a simple structure, requires no supporting electrical equipment, has low initial investment costs, and low subsequent operation and management expenses, greatly contributing to the construction of sponge cities. In addition, this invention includes a rainwater diversion tank 2-2, controlled by a pressure control component 2-5, which can automatically convert the direction of rainwater flow with zero energy consumption, ensuring that excess rainwater can be discharged in a timely and effective manner.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic rainwater storage and drainage system for elevated bridges suitable for sponge city construction in hilly areas, comprising an elevated bridge (1-1) and a green belt irrigation system, wherein the elevated bridge (1-1) is provided with drainage outlets on its deck, and the drainage outlets are connected to bridge drainage pipes (2-1), characterized in that, Also includes: A water storage system, comprising a water storage tank (2-4), wherein the water storage tank (2-4) is connected to a bridge drainage pipe (2-1), and under the action of gravitational potential energy, water in the bridge drainage pipe (2-1) can automatically enter the water storage tank (2-4); The drainage system is connected to the water storage tank (2-4) and the green belt irrigation system. Under the action of gravitational potential energy, the water in the water storage tank (2-4) automatically enters the green belt irrigation system through the drainage system. The rainwater diversion system includes a rainwater diversion pool (2-2), which is connected to a water storage tank (2-4) and a bridge drainage pipe (2-1). The rainwater diversion pool (2-2) is equipped with an overflow outlet, and a pressure control component (2-5) is installed at the overflow outlet. When the water level in the water storage tank (2-4) reaches the set water level, the pressure control component (2-5) is automatically opened under the action of water pressure difference, so that the water in the rainwater diversion pool (2-2) enters the municipal pipe network. The pressure control component (2-5) has an inlet end and an outlet end, which connect to form a diversion channel. The inlet end of the pressure control component (2-5) is connected to the overflow port of the rainwater diversion tank (2-2), and the outlet end is connected to the municipal pipe network. The pressure control component (2-5) also has a pressure control valve (2-5-2), which includes a pressure control spring (4-1) and a water-blocking element connected to the pressure control spring (4-1). The water-blocking element is activated by pressure control. The control spring (4-1) blocks the diversion channel, preventing the inlet and outlet of the pressure control component (2-5) from connecting. When the water level in the storage tank (2-4) reaches the set water level, the water in the rainwater diversion pool (2-2) overcomes the elastic force of the pressure control spring (4-1) under the action of water pressure difference, pushing the water-blocking element to move a certain distance H3, so that the inlet and outlet of the pressure control component (2-5) are connected, and the water in the rainwater diversion pool (2-2) enters the municipal pipe network through the diversion channel.

2. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 1, characterized in that, It also includes a road cutting slope (1-3) and a green belt (1-4). The water storage tank (2-4) is set on the road cutting slope (1-3), and the upper end of the water storage tank (2-4) is lower than the drainage outlet of the viaduct (1-1), and the lower end is higher than the green belt (1-4).

3. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 2, characterized in that, The height difference between the upper end of the water storage tank (2-4) and the drainage outlet of the viaduct (1-1) is H1, and the height difference between the lower end and the green belt (1-4) is H2. The potential energy of the height difference H1 allows the rainwater from the viaduct (1-1) to automatically fill the water storage tank (2-4), and the potential energy of the height difference H2 allows the rainwater in the water storage tank (2-4) to automatically drain into the green belt irrigation system.

4. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 3, characterized in that, The top of the water storage tank (2-4) is provided with an exhaust pipe (2-4-3), and the height difference between the upper end of the exhaust pipe (2-4-3) and the upper end of the water storage tank (2-4) is greater than H1.

5. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 1, characterized in that, The water storage system also includes an inlet pipe (2-3), the lower end of which is connected to the rainwater diversion pool (2-2), and the upper end of which is connected to the inlet of the water storage tank (2-4). The inlet of the water storage tank (2-4) is located at the upper end of the water storage tank (2-4) or near the upper end of the water storage tank (2-4).

6. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 5, characterized in that, The water storage tank (2-4) is equipped with a sedimentation baffle (2-4-1) near the water inlet. The bottom of the water storage tank (2-4) is equipped with a drain outlet (2-4-2). The drain outlet (2-4-2) is located between the water inlet of the water storage tank (2-4) and the sedimentation baffle (2-4-1). A drain valve is installed at the drain outlet (2-4-2).

7. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 1, characterized in that, The drainage system includes a drain pipe (3-1) and a drain valve installed on the drain pipe (3-1). The upper end of the drain pipe (3-1) is connected to the bottom of the water storage tank (2-4), and the lower end is connected to the green belt irrigation system.

8. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 1, characterized in that, The rainwater diversion pool (2-2) is located below the central green belt under the viaduct (1-1), and the lower end of the bridge drainage pipe (2-1) is connected to the upper end of the rainwater diversion pool (2-2).

9. The automatic rainwater storage and drainage system for elevated bridges suitable for sponge cities in hilly areas according to claim 1, characterized in that, The pressure control assembly (2-5) further includes an overflow pipe (2-5-1), and the pressure control valve (2-5-2) further includes an L-shaped pipe. The water-blocking element includes a piston (4-2), a piston rod (4-3), and a water-stop plate (4-4). One end of the horizontal section of the L-shaped pipe is the inlet of the pressure control assembly (2-5) and is connected to the overflow port of the rainwater diversion tank (2-2). The pressure control spring (4-1) is vertically installed at one end of the vertical section of the L-shaped pipe. The upper end of the piston rod (4-3) is connected to the piston (4-2), and the lower end is connected to the water-stop plate (4-4). The piston (4-2) and the pressure control spring (4-1) are connected... The lower end is connected, and the waterstop plate (4-4) is located in the vertical pipe section of the L-shaped pipe. A sealing structure is provided between the waterstop plate (4-4) and the inner pipe wall of the vertical pipe section of the L-shaped pipe. This sealing connection is used to prevent water leakage between the waterstop plate (4-4) and the inner pipe wall of the vertical pipe section of the L-shaped pipe. A diversion port is provided on the vertical pipe section of the L-shaped pipe. One end of the overflow pipe (2-5-1) is connected to the diversion port, and the other end of the overflow pipe (2-5-1) is the outlet end of the pressure control component (2-5) and is connected to the municipal pipe network. When the waterstop plate (4-4) is not under water pressure, the vertical distance between the lower end face of the waterstop plate (4-4) and the lower end of the diversion port is H3.

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