CN116584274A - Sponge urban green belt and drainage system - Google Patents

Abstract

The application relates to the field of urban construction, in particular to a sponge city green belt and a drainage system. The sponge city green belt includes: a planting belt, the planting belt includes a concrete layer fixed on the road surface, and is laid on the concrete layer for planting green plants. The planting layer; the reservoir, set up below the road surface and below the planting belt; the underground pipeline, fixedly arranged under the reservoir and connected with the sewer; the planting belt is fixed with connecting pipes and absorbent cotton, and the connecting pipe and absorbent cotton The lower end of the pipe extends to the reservoir, the upper end of the connecting pipe extends upwards above the planting layer, and the upper end of the absorbent cotton extends upwards into the planting layer. There is a drain pipe connected between the reservoir and the underground pipeline, and a valve is provided in the drain pipe to store water. Connecting pipes and water-absorbing cotton are set between the pond and the planting belt, so that excess rainwater can be stored in the reservoir in rainy seasons, and the water in the reservoir can be directly used in rainy seasons, improving the flexibility of green belts in utilizing water resources .

Description

A kind of sponge city green belt and drainage system

technical field

The application relates to the field of urban construction, in particular to a sponge city green belt and drainage system.

Background technique

Sponge city refers to a city that can be like a sponge and has good "elasticity" in adapting to environmental changes and responding to natural disasters. When it rains, it absorbs, stores, infiltrates, and purifies water. use.

The green belt is an important part of the sponge city construction. However, although the existing green belt can absorb and store water well in the rainy season and reduce the occurrence of urban waterlogging, in the rainy season, the green belt in the It is difficult to use the water resources quickly and effectively, and the green belts are less flexible for the use of water resources.

Contents of the invention

In order to solve the problem of poor flexibility of green belts for water resource utilization, the present application provides a sponge city green belt and drainage system.

A kind of sponge city green belt provided by the application adopts the following technical scheme:

A sponge city green belt, comprising: a planting belt, the planting belt includes a concrete layer fixed on the road surface, and a planting layer laid on the concrete layer for planting green plants; a water storage pool is opened below the road surface and below the planting belt The underground pipeline is fixedly arranged under the reservoir and communicates with the sewer; the planting belt is fixed with a connecting pipe and absorbent cotton, the lower ends of the connecting pipe and absorbent cotton extend to the reservoir, and the upper end of the connecting pipe extends upward to the planting layer Above, the upper end of the water-absorbing cotton extends upward to the planting layer, and a drainage pipe is connected between the reservoir and the underground pipeline, and a valve is arranged in the drainage pipe.

By adopting the above-mentioned technical scheme, the planting in the planting belt can absorb rainwater during the rainy season and reduce the usual irrigation water; when there is too much rain in the planting belt, the rainwater can flow into the storage tank through the connecting pipe for storage and standby; When there is too much water stored, the valve can be opened and the water in the reservoir can be discharged into the underground pipe through the drainage pipe, and then discharged to the lake, river, etc. through the sewer, so as to ensure the full use of rainwater and reduce the occurrence of waterlogging; in the rainy season The planting layer in the planting belt absorbs the spare water in the reservoir through absorbent cotton, which can also reduce the usual irrigation water. The spare water in the reservoir can be directly extracted and utilized through the connecting pipe, improving the flexible utilization of water resources in the green belt .

Further preferably, a planting trough with an upward opening is opened in the concrete layer, and the planting layer is arranged in the planting trough.

By adopting the above technical scheme, the planting trough is set and the top surface of the planting layer is lower than the notch of the planting trough, so as to prevent the soil in the planting layer from flowing out of the planting trough to the outside of the green belt with the rainwater in the rainy season, affecting pedestrians on the road and vehicle driving.

Further preferably, a manhole cover is detachably connected to the top of the connecting pipe.

By adopting the above technical scheme, the installation of the well cover on the connecting pipe can reduce the soil from entering the connecting pipe and cause blockage, and can also eliminate the hidden danger of people falling; after the well cover is removed from the connecting pipe, the water pipes of the pump can be inserted into Into the reservoir, it is convenient for direct pumping and utilization.

A drainage system provided by the application adopts the following technical scheme:

A drainage system, including a drainage ditch opened below the road surface and the above-mentioned sponge city green belt, a baffle plate is hinged at the bottom of the concrete layer, and a rotation damping is fixedly connected between the baffle plate and the concrete layer, and the baffle plate is located between the drainage ditch and the concrete layer. Between the cisterns, the baffles can be rotated to block or communicate with the drainage ditches and the cisterns.

By adopting the above technical solution, the water flow in the gutter will exert pressure on the baffle, and when the pressure can overcome the pressure of the water in the reservoir on the baffle and the elastic force of the rotation damping, the water in the gutter will push the baffle to rotate, At this time, it shows that the water flow in the drainage ditch is too large, and there is a tendency of waterlogging on the road surface. At this time, under the action of water flow pressure, the baffle is pushed to rotate and the drainage ditch is connected with the reservoir, so that the water in the drainage ditch flows into the storage tank. In the pool, the drainage pressure of the drainage ditch is shared by the reservoir to ensure the drainage function of the drainage system.

Further preferably, an installation groove is opened through the baffle plate, and an inner plate is rotated in the installation groove, and the rotation of the inner plate can block or communicate with the drainage ditch and the reservoir.

By adopting the above technical scheme, when normal drainage is carried out in the drainage ditch, the normal flow of water exerts pressure on the inner plate, overcomes the pressure of the water in the reservoir on the inner panel and pushes the inner panel to rotate, so that the drainage ditch communicates with the reservoir, So that the water in the drainage ditch flows into the reservoir as a backup, when the pressure of the water in the drainage ditch on the inner plate is not enough to overcome the pressure of the water in the reservoir on the inner plate and push the inner plate to rotate, the inner The board blocks the drainage ditch and the storage tank, so that the water in the drainage ditch can no longer flow into the storage tank, so that the storage tank has a certain overflow margin to prepare for sharing the drainage pressure of the drainage ditch during waterlogging.

Further preferably, a limit bar is fixed in the installation groove, and the limit bar is used to prevent the inner plate from turning to the side of the drainage ditch.

By adopting the above technical scheme, the limit plate is set to prevent the inner plate from rotating to the side of the drainage ditch. When there is no water flow in the drainage ditch, even if the water in the reservoir exerts pressure on the inner plate, the inner plate will not rotate, avoiding water storage The water in the pool flows into the drain to cause water loss.

Further preferably, the bottom of the drainage ditch is connected with a vertical groove, the underground pipe is connected with the vertical groove, and a lifting plate is provided for sliding up and down in the vertical groove, and the fixed connection between the bottom of the lifting plate and the bottom wall of the vertical groove is elastic. The vertical groove and the underground pipeline are blocked or connected through the lifting and sliding of the lifting plate. The strip can be snapped into the bayonet socket.

By adopting the above-mentioned technical scheme, when the water flow in the drainage ditch pushes the baffle to rotate, the clamping bar comes out from the bayonet, and the lifting plate slides downward under the action of the elastic member, so that the vertical groove is connected with the underground pipeline. At this time, the drainage ditch The water inside can directly flow into the underground pipeline for drainage through the vertical groove, further sharing the drainage pressure of the drainage ditch and ensuring the drainage effect.

Further preferably, a hook is fixedly provided at the top of the lifting plate.

By adopting the above technical scheme, the lifting plate can be pulled up by hooking the hook manually or using a tool. During the process of pulling the lifting plate, the baffle plate needs to be pushed to rotate to avoid the clamp bar from hindering the lifting plate from rising. At this time, the clip on the baffle is inserted into the bayonet again to complete the reset, and the operation is simple, convenient and quick.

Further preferably, a grid plate is detachably installed on the top of the gutter.

By adopting the above technical solution, the grille can reduce the situation that sundries and garbage enter the drainage ditch and cause blockage, and the grille can be disassembled and installed, and it is also convenient to clean up the garbage falling into the drainage ditch.

Further preferably, the grid is L-shaped.

By adopting the above-mentioned technical scheme, when artificially using a tool to reset the lifting plate, the tool passes through the lifting plate to hook the hook, and the L-shaped setting makes the tool have a larger operating space, and it is also convenient to push the baffle to prevent Bars prevent reset.

In summary, the present application includes at least one of the following beneficial technical effects:

1. In this application, connecting pipes and absorbent cotton are arranged between the reservoir and the planting belt, so that excess rainwater can be stored in the reservoir during the rainy season, and the water in the reservoir can be directly used during the rainy season. Improve the flexibility of the green belt for water resource utilization, and connect the reservoir and the underground pipeline through drainage pipes and valves to reduce the occurrence of waterlogging in the green belt;

2. In the further setting of this application, in the drainage system, under the action of the water flow pressure of the drainage ditch, the baffle is pushed to rotate and the drainage ditch is connected with the reservoir, so that the water in the drainage ditch flows into the reservoir, and passes through The reservoir shares the drainage pressure of the drainage ditch to ensure the drainage function of the drainage system;

3. In the further setting of this application, when the water flow in the drainage ditch pushes the baffle to rotate, the clamping bar comes out of the bayonet, and the lifting plate slides down under the action of the elastic member, so that the vertical groove communicates with the underground pipeline. At the same time, the water in the drainage ditch can directly flow into the underground pipeline for drainage through the vertical groove, which further shares the drainage pressure of the drainage ditch and ensures the drainage effect.

Description of drawings

Fig. 1 is a sectional view of a kind of sponge city green belt;

Fig. 2 is a sectional view of a drainage system;

Fig. 3 is the enlarged schematic diagram of A in Fig. 2;

Fig. 4 is a schematic diagram of the state of baffle rotation in Fig. 2;

Fig. 5 is a schematic diagram of the rotating state of the inner plate in Fig. 2 .

Explanation of reference signs: 1, planting belt; 11, concrete layer; 111, planting tank; 12, planting layer; 13, connecting pipe; 14, absorbent cotton; 15, manhole cover; 2, reservoir; 21, drainage pipe; 22. Valve; 3. Underground pipeline; 4. Drainage ditch; 5. Grating; 6. Baffle; 61. Installation groove; 62. Inner plate; 63. Limiting strip; 64. Clamping strip; 8. Vertical groove ; 9, lifting plate; 91, bayonet; 92, hook; 10, elastic member.

Detailed ways

The present application will be further described in detail in conjunction with accompanying drawings 1 to 5 below.

The application discloses a kind of sponge city green belt, and specifically discloses the following embodiments:

As shown in Figure 1, the sponge city green belt includes a planting belt 1, a reservoir 2 and an underground pipeline 3 arranged sequentially from top to bottom, wherein the planting belt 1 is arranged above the road surface, and the reservoir 2 and the underground pipeline 3 are all arranged below the road surface, and the underground pipeline 3 communicates with the underground sewer (not shown). In this embodiment, the front and rear ends of the underground pipeline 3 can communicate with the sewer.

Specifically, for the planting belt 1, it includes a concrete layer 11 fixed on the road surface, a planting layer 12 laid on the concrete layer 11 for planting green plants, and a connecting pipe 13 and absorbent cotton 14 are fixed in the planting belt 1 , the connecting pipe 13 and the water-absorbing cotton 14 are all vertically arranged, and the lower ends of the connecting pipe 13 and the water-absorbing cotton 14 extend into the reservoir 2, the upper end of the connecting pipe 13 extends upwards above the planting layer 12, and the upper end of the water-absorbing cotton 14 goes upwards Extend to planting layer 12.

Generally, the planting layer 12 includes a soil layer, a sandstone layer, etc., and an appropriate planting layer 12 is selected according to the types of green plants to be planted. In the rainy season, the soil in the planting layer 12 can absorb rainwater for the growth of green plants, thereby reducing the usual irrigation water and saving water resources; if too much rainwater in the planting layer 12 overflows the planting layer 12, the water will pass through the connecting pipe 13 flows into the storage tank 2 for storage and backup, thereby making full use of rainwater resources; during the rainy season, the planting layer 12 absorbs the water in the storage tank 2 through the absorbent cotton 14, which can also reduce irrigation water. In this embodiment, the upper end of the connecting pipe 13 is flush with the upper end of the planting layer 12, which can play a certain hidden role and is beautiful. The upper end of the water-absorbing cotton 14 is also flush with the upper end of the planting layer 12. In the process of absorbing and transferring the water in the planting layer 12, a certain amount of water can be transferred to different depth positions of the planting layer 12, so that the distribution of the water in the planting layer 12 is as uniform as possible.

When direct water is needed, such as road cleaning, fire-fighting water, etc., the water pipe of the water pump can be stretched into the reservoir 2 through the connecting pipe 13 to directly extract and use, which is convenient and quick, thereby improving the flexibility of water resource utilization in green belts.

A drainpipe 21 is connected between the reservoir 2 and the underground pipeline 3, and a valve 22 is arranged in the drainpipe 21. When the water in the reservoir 2 is too much, the water in the reservoir 2 can be discharged by opening the valve 22. into the underground pipe 3, and then into the sewer. In this embodiment, the valve 22 can be a pressure valve, that is, after a certain water level is reached in the reservoir 2, the water pressure on the pressure valve reaches the maximum threshold, and the pressure valve is opened until the water pressure on the pressure valve reaches the minimum threshold. Close the pressure valve again. Setting a reasonable pressure valve threshold range can prevent the water in the reservoir 2 from being too full, causing rainwater to fail to enter the reservoir 2 through the connecting pipe 13, and also ensure that there is a spare water volume in the reservoir 2 for direct use. access.

The concrete layer 11 is provided with a planting groove 111 with an upward opening, the planting layer 12 is laid in the planting groove 111, and the planting layer 12 is arranged in the planting groove 111, that is, the top surface of the planting layer 12 should be lower than the notch of the planting groove 111 , when the rainwater is full of the planting layer 12, avoid rainwater from driving the gravel and soil in the planting layer 12 to flow out from the planting groove 111, and flow to the road surface, affecting pedestrians and vehicles.

In addition, a manhole cover 15 is detachably connected to the top of the connecting pipe 13. In normal use, the manhole cover 15 is fixedly connected to the top of the connecting pipe 13, and the manhole cover 15 is only provided with holes for rainwater to pass through. The setting of the well cover 15 can prevent a large amount of soil or gravel from falling into the connecting pipe 13, causing the connecting pipe 13 to be blocked. In addition, the well cover 15 can also prevent people from falling to ensure safety. When the water in the reservoir 2 needs to be drawn out for use, the well cover 15 is removed to facilitate the insertion of a water pipe into the connecting pipe 13 for pumping, which is convenient, quick, safe and reliable.

The application also discloses a drainage system, specifically the following embodiments are disclosed:

As shown in accompanying drawing 2, accompanying drawing 3, this drainage system comprises opening the gutter 4 below the road surface and the above-mentioned sponge city green belt, is hinged with baffle plate 6 at the bottom of concrete layer 11, between baffle plate 6 and concrete layer 11 Rotational damping (not shown) is fixedly connected between them, and the baffle 6 is located between the drainage ditch 4 and the reservoir 2, and the rotation of the baffle 6 can block or connect the drainage ditch 4 and the reservoir 2. Specifically, drainage ditches 4 are arranged on the left and right sides of the concrete layer 11, and baffles 6 are arranged between the drainage ditch 4 and the reservoir 2. Rotational damping is connected between the front and rear ends of the plate 6 and the concrete layer 11. In this embodiment, torsion springs are used for the rotational damping.

The water in the drainage ditch 4 flows along the front and back directions and flows to lakes, rivers, etc. The water in the drainage ditch 4 mainly comes from the accumulated water on the road surface. If the water flow in the drainage ditch 4 is large, it means that the accumulated water on the road surface is too Many, waterlogging may occur or is about to occur. At this time, under the water pressure of the drainage ditch 4, the baffle plate 6 will be pushed to rotate and connect the drainage ditch 4 and the reservoir 2, so that the water in the drainage ditch 4 will flow into the reservoir 2 in.

Specifically, the water in the gutter 4 exerts pressure on the baffle plate 6 and makes the baffle plate 6 have a tendency to rotate to the side of the reservoir 2, while the water in the reservoir 2 and the rotation damping have a reaction force on the baffle plate 6 , when the pressure of the water in the drainage ditch 4 on the baffle 6 can overcome the pressure of the water in the reservoir 2 on the baffle 6 and the elastic force of the rotation damping, and make the baffle 6 rotate, it means that there is a tendency of waterlogging on the road surface , so that the drainage system can automatically connect the drainage ditch 4 and the reservoir 2 according to the amount of accumulated water on the road surface or the size of the water flow in the drainage ditch 4, and share the drainage pressure of the drainage ditch 4. The state after the baffle plate 6 rotates is as attached Figure 4 shows.

It should be noted that, in fact, the water in the drainage ditch 4 needs to overcome the gravity of the baffle 6 to push the baffle 6 to rotate, and the gravity is negligible relative to the rotation damping and the reaction force of the water in the reservoir 2 .

In addition, setting the rotation damping limits the minimum pressure that the water in the gutter 4 can push the baffle 6 to rotate, that is, when the reaction force of the water in the reservoir 2 to the baffle 6 is zero, the water in the gutter 4 will push the baffle 6 to zero. The pressure of 6 only needs to overcome the rotation damping to push the baffle plate 6 to rotate.

And when the water flow in the drain ditch 4 is small, the baffle plate 6 cannot be pushed to rotate, so that the water in the drain ditch 4 is directly discharged to lakes and rivers, so that water resources cannot be effectively utilized. In a further setting, an installation groove 61 is opened through the baffle plate 6, and an inner plate 62 is rotated in the installation groove 61, and the rotation of the inner plate 62 can block or communicate with the drainage ditch 4 and the reservoir 2. A limit bar 63 is fixed inside the groove 61, and the limit bar 63 is used to prevent the inner panel 62 from rotating toward the side of the drainage ditch 4, wherein the limit bar 63 and the baffle plate 6 can be integrally formed.

Specifically, take the baffle plate 6 between the drainage ditch 4 on the left side and the reservoir 2 as an example for illustration. The walls are rotatably connected, and the limiting strip 63 is arranged on the bottom wall of the installation groove 61 . In other embodiments, the limiting strip 63 can also be arranged on the upper, lower, front and rear walls of the installation groove 61 . When normal drainage is carried out in the drainage ditch 4, that is, the pressure of the water in the drainage ditch 4 on the baffle plate 6 is not enough to push the baffle plate 6 to rotate, but no rotation damping is set on the inner plate 62, so that the water in the drainage ditch 4 has an impact on the inner plate. The pressure of 62 only needs to overcome the reaction force of the water in the reservoir 2 to the inner plate 62, and the inner panel 62 can be pushed to rotate toward the reservoir 2, so that the water flow in the drainage ditch 4 flows into the reservoir 2 for backup.

When the water pressure in the water storage tank 2 was balanced with the water pressure in the drainage ditch 4, the inner plate 62 reset and closed the installation groove 61. At this time, the water in the drainage ditch 4 no longer flows into the storage tank 2, avoiding Reservoir 2 is fully stored, so that reservoir 2 has a certain overflow margin, in order to share the drainage pressure of drainage ditch 4 when waterlogging, the rotation loading of inner plate 62 is as shown in accompanying drawing 5.

It should be noted that the reaction pressure of the water in the reservoir 2 to the inner plate 62 and the baffle 6 has a maximum value, that is, when the water level in the reservoir 2 reaches the maximum threshold of the valve 22 in the drain pipe 21, the water will be stored The reaction pressure of the water in the pool 2 to the inner plate 62 and the baffle 6 is the largest. When the water in the drainage ditch 4 continues to enter the reservoir 2 by pushing the inner plate 62 or the baffle 6 to rotate, the valve 22 will open , so that the water in the reservoir 2 maintains a dynamic balance.

Specifically, when the water pressure in the drainage ditch 4 only pushes the inner plate 62 to rotate, and makes the water level in the reservoir 2 reach the maximum threshold set by the valve 22, the water in the reservoir 2 will press against the inner panel 62 and the barrier. The reaction force of the plate is the largest. When the water level in the drainage ditch 4 continues to rise, before the water pressure in the drainage ditch 4 is not enough to push the baffle plate 6 to rotate, the water in the drainage ditch 4 will push the inner plate 62 to rotate, so that the water in the drainage ditch 4 will flow into the In the reservoir 2, at this time, the valve 22 is also opened to discharge the water in the reservoir 2, so that the water in the reservoir 2 maintains a dynamic balance; when the water level in the drain 4 rises enough to push the baffle plate 6 to rotate , the baffle plate 6 rotates, so that the water in the gutter 4 flows into the reservoir 2 with a larger flow rate. At this time, the water in the reservoir 2 still maintains a dynamic balance under the action of the valve 22, and the The flow rate also increases accordingly. In the specific setting, the maximum flow rate of the valve 22 is limited, so multiple valves 22 are also provided to deal with waterlogging.

In further setting, as shown in accompanying drawing 2 and accompanying drawing 3, the bottom of drainage ditch 4 is connected with vertical groove 8, and underground pipeline 3 is connected with vertical groove 8, and vertical groove 8 is provided with lifting plate 9 sliding up and down. , between the bottom of the lifting plate 9 and the bottom wall of the vertical groove 8, an elastic member 10 is fixedly connected, and the vertical groove 8 is blocked or communicated with the underground pipeline 3 by the lifting and sliding of the lifting plate 9. In addition, a bayonet 91 is provided on the lifting plate 9, and a clip 64 is fixed on the baffle 6. When the baffle 6 blocks the drainage ditch 4 and the reservoir 2, the clip 64 can be snapped into the bayonet 91. A hook 92 is fixed on the top of the lifting plate 9 , wherein the clamping strip 64 and the baffle plate 6 can be integrally formed.

Specifically, taking the drain ditch 4 on the left, the baffle plate 6 and the lifting plate 9 as an example for illustration, the vertical groove 8 is vertically opened and the vertical groove 8 is not directly connected with the reservoir 2, and the right side of the vertical groove 8 The bottom communicates with the underground pipeline 3. When the baffle plate 6 blocks the drainage ditch 4 and the reservoir 2, the clamping strip 64 snaps into the bayonet 91. At this time, the lifting plate 9 is in the upper limit position and blocks the vertical groove 8 and the underground pipeline 3. When the drainage ditch 4 When the internal water pressure pushes the baffle plate 6 to rotate, the clip 64 comes out from the bayonet 91, and the lifting plate 9 slides downward under the action of the elastic member 10, so that the drainage ditch 4 and the underground pipe 3 are communicated through the vertical groove 8 , so that the water in the drainage ditch 4 can be directly discharged into the underground pipeline 3 through the vertical groove 8, further sharing the drainage pressure of the drainage ditch 4.

In this embodiment, the elastic member 10 adopts a spring. During the lifting process of the lifting plate 9, the spring is always in a stretched state, so that the lifting plate 9 always has a pulling force to pull it downward. Drive lifting plate 9 to slide fast.

In addition, the top of the lifting plate 9 is fixedly provided with a hook 92. After the waterlogging situation is over, the hook 92 can be inserted into the vertical groove 8 manually or with a tool, and the lifting plate 9 is pulled upwards to reset. It should be noted that after the waterlogging situation is over, the baffle 6 will block the drainage ditch 4 and the reservoir 2 again. At this time, the bar 64 will restrict the reset of the lifting plate 9, and the baffle 6 needs to be manually pushed slightly to avoid the bar 64 interfering lifting plate 9 resets, after lifting plate 9 resets, also can reduce the smell in the underground pipeline 3 to pass through vertical groove 8 and gutter 4 and transmit.

A grid plate 5 is detachably installed on the top of the drainage ditch 4, and the grid plate 5 is L-shaped as a whole. Specifically, the grating 5 adopts the cement grating 5, and it only needs to be installed on the top of the drainage ditch 4 under the action of its own gravity, which is convenient and quick. The grid plate 5 is L-shaped as a whole, and the L-shaped fence provided therein is convenient for passing tools, and also provides a larger tool operation space when the lifting plate 9 is reset.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (10)

1. A sponge city green belt, characterized in that it comprises: a planting belt (1), the planting belt (1) comprising a concrete layer (11) fixed on the road surface, laid on the concrete layer (11) A planting layer (12) for planting green plants; a reservoir (2), which is opened below the road surface and below the planting belt (1); an underground pipeline (3), fixedly arranged in the reservoir (2) ) and connected with the sewer; the planting belt (1) is fixed with a connecting pipe (13) and absorbent cotton (14), and the lower ends of the connecting pipe (13) and the absorbent cotton (14) extend to the In the water storage tank (2), the upper end of the connecting pipe (13) extends upwards above the planting layer (12), and the upper end of the absorbent cotton (14) extends upwards to the planting layer (12), so A drainpipe (21) is connected between the reservoir (2) and the underground pipeline (3), and a valve (22) is arranged in the drainpipe (21). 2. The sponge city green belt according to claim 1, characterized in that, the concrete layer (11) is provided with a planting trough (111) with an upward opening, and the planting layer (12) is set in the planting trough (111) inside. 3. The sponge city green belt according to claim 1, characterized in that, a well cover (15) is detachably connected to the top of the connecting pipe (13). 4. A drainage system, characterized in that it includes a drainage ditch (4) opened below the road surface and the sponge city green belt according to any one of claims 1 to 3, the bottom of the concrete layer (11) is hinged with The baffle (6), the rotation damping is fixedly connected between the baffle (6) and the concrete layer (11), the baffle (6) is located between the drainage ditch (4) and the reservoir (2), through the rotation of the baffle (6), the drainage ditch (4) and the water storage tank (2) can be blocked or connected. 5. The drainage system according to claim 4, characterized in that, an installation groove (61) is opened through the inside of the baffle plate (6), and an inner plate (62) is rotated inside the installation groove (61), The rotation of the inner plate (62) can block or connect the drainage ditch (4) and the reservoir (2). 6. The drainage system according to claim 5, characterized in that, a limit strip (63) is fixed inside the installation groove (61), and the limit strip (63) is used to block the inner plate (62 ) to the side of the drainage ditch (4). 7. The drainage system according to claim 5, characterized in that, the bottom of the drainage ditch (4) is connected with a vertical groove (8), and the underground pipe (3) is connected to the vertical groove (8) connected, the vertical slot (8) is provided with a lifting plate (9) sliding up and down, and an elastic member (10) is fixedly connected between the bottom of the lifting plate (9) and the bottom wall of the vertical slot (8). ), through the lifting and sliding of the lifting plate (9) to block or communicate between the vertical groove (8) and the underground pipeline (3), the lifting plate (9) is provided with a bayonet (91) , the baffle (6) is fixed with a clip (64), when the baffle (6) blocks the drain (4) and the reservoir (2), the clip ( 64) can be clamped to the bayonet (91). 8. The drainage system according to claim 7, characterized in that a hook (92) is fixed on the top of the lifting plate (9). 9. The drainage system according to claim 4, characterized in that, a grille (5) is detachably installed on the top of the drainage ditch (4). 10. The drainage system according to claim 9, characterized in that, the grille (5) is L-shaped.