Rainwater garden type central divider strip drainage structure and construction method

Abstract

This application relates to the field of road drainage technology, and provides a rain garden-style median strip drainage structure, which includes a trench dug in the center of the road, a filter assembly, and a conveying assembly. The filter assembly includes a first filter plate and second filter plates disposed at both ends of the first filter plate. The first filter plate is supported on the trench wall, a first planting layer is disposed above the first filter plate, and a water storage area is disposed below the first filter plate. The surface of the first filter plate is arc-shaped. The second filter plate extends along the height direction of the trench. The conveying assembly includes multiple conveying pipes, one end of which extends to the water storage area, and the other end extends into the first planting layer. The conveying pipes are filled with conveying sponges, one end of which extends to the first planting layer, and the other end extends into the water in the water storage area, which reduces the difference in soil moisture content in the median strip between the rainy and dry seasons.

Description

Technical Field

[0001] This application relates to the field of road drainage technology, and in particular to a rain garden-style median strip drainage structure and construction method. Background Technology

[0002] Rain gardens are ecological facilities in cities that utilize rainwater resources and manage rainwater through natural purification, infiltration, and storage. They typically consist of artificially excavated shallow green spaces, sunken green spaces, rainwater wetlands, etc.

[0003] A median strip is a safety feature placed in the middle of a road. Its main purpose is to prevent vehicles from crossing the median strip into the oncoming lane and to protect structures within the median strip.

[0004] Some roads now have rain gardens in the center, which serve as a central median. On the one hand, they collect some of the rainwater, relieving the drainage pressure on the road and regulating the air quality; on the other hand, they increase the greenery along the road and improve its aesthetics.

[0005] In some cities, the rainy and dry seasons are quite distinct, causing the soil in the median strip to sometimes be water-scarce and sometimes have excessively high moisture content, which is detrimental to plant growth. Therefore, it is necessary to design a rain garden-style drainage structure for the median strip to reduce the difference in soil moisture content between the rainy and dry seasons. Utility Model Content

[0006] To reduce the difference in soil moisture content in the median strip between the rainy and dry seasons, this application provides a rain garden-style median strip drainage structure and construction method.

[0007] On the one hand, the rain garden-style central median drainage structure provided in this application adopts the following technical solution:

[0008] A rain garden-style central median drainage structure includes a trench dug in the center of the road, a filtering assembly, and a conveying assembly. The filtering assembly includes a first filter plate and second filter plates disposed at both ends of the first filter plate. The first filter plate is supported on the trench wall, a first planting layer is disposed above the first filter plate, and a water storage area is disposed below the first filter plate. Multiple first filter plates are disposed, spaced apart along the length of the trench, and the surface of the first filter plate is arc-shaped. The second filter plates extend along the height of the trench. The conveying assembly includes multiple conveying pipes, one end of which extends to the water storage area, and the other end extends into the first planting layer. Multiple water inlets are provided on the pipe walls in the water storage area and in the first planting layer. The conveying pipes are filled with conveying sponges, one end of which extends to the first planting layer, and the other end extends into the water in the water storage area.

[0009] By adopting the above technical solution, when rainfall is heavy, rainwater falls on the first planting layer. Part of the rainwater in the first planting layer is filtered and flows into the water storage area, while the other part flows to both ends of the first planting layer and falls between adjacent second filter plates. After being filtered by the second filter plates, it enters the water storage area for storage. When rainfall is light, the conveying sponge and conveying pipes transport water from the water storage area to the first planting layer to replenish its moisture. This effectively guides most of the water to the space between the adjacent second filter plates and then to the water storage area during periods of heavy rainfall, reducing the drainage pressure on the first planting layer. Furthermore, when rainfall is light, the conveying components replenish the water in the first planting layer, thereby reducing the difference in soil moisture content in the central divider between the rainy and dry seasons.

[0010] Optionally, the height of the second filter plate is higher than the height of the first planting layer.

[0011] By adopting the above technical solution, the upper part of the second filter plate filters the water before it flows into the space between the adjacent second filter plates, reducing the risk of impurities such as leaves entering the space between the adjacent second filter plates.

[0012] Optionally, a filter sponge is provided between adjacent first filter plates, the filter sponge being used to fill the gap between adjacent second filter plates.

[0013] By adopting the above technical solution, the water flowing from the second filter plate into the water storage area is filtered using a filter sponge, further reducing the amount of impurities entering the water storage area.

[0014] Optionally, a second planting layer is provided above the filter sponge, and the upper surface of the second planting layer is flush with both ends of the upper surface of the first planting layer.

[0015] By adopting the above technical solutions, the aesthetics of the central divider can be improved.

[0016] Optionally, a planting box is provided above the filter sponge, and the second planting layer is located in the planting box; the planting box is slidably connected to the groove wall; a support spring is provided in the filter sponge, one end of the support spring is connected to the bottom of the groove, and the other end is connected to the bottom wall of the planting box.

[0017] By adopting the above technical solution, on the one hand, the filter sponge and supporting spring together support the planting box, preventing excessive deformation of the filter sponge and ensuring its water absorption capacity. On the other hand, since the planting box is slidably connected to the trench wall, when a large amount of water flows into the planting box, the mass of the planting box increases, the filter sponge and supporting spring are compressed, and the planting box slides downward, increasing the volume of the area between the adjacent first planting layers used to hold water, thus temporarily storing water. Part of this water flows into the water storage area through the second planting layer and the filter sponge, while another part flows into the water storage area through the second filter plate and the first planting layer. When there is excessive rainfall, the height of the upper surface of the planting box is lower than the height of the lower surface of the first planting layer, allowing the water in the second planting layer to directly enter the water storage area after being filtered by the vegetation and the second filter plate, thereby reducing drainage pressure and improving drainage efficiency.

[0018] Optionally, a drain pipe is provided in the first planting layer, one end of which extends to the water storage area and the other end abuts against the surface of the second filter plate away from the planting box; when the second planting layer is at the same height as the first planting layer, the planting box abuts against the end of the drain pipe.

[0019] By adopting the above technical solution, when there is a lot of rainfall and the planting box is lowered, the end of the drainage pipe is exposed. A portion of the water above the second planting layer is filtered by the second filter plate and then directly enters the water storage area through the drainage pipe, further improving the drainage capacity.

[0020] Optionally, the conveying sponge is provided with a support rod inside, which extends along the length of the conveying sponge.

[0021] By adopting the above technical solution, when it is necessary to replace the sponge, the support rod can be pulled out of the conveying pipe, and the conveying sponge can be brought out of the conveying pipe by the support rod, which is convenient and quick.

[0022] Optionally, the support rod adjacent to the second filter plate is connected to the side of the conveying sponge away from the second filter plate; the planting box is connected to a pull rope, the end of the pull rope away from the planting box is connected to the support rod adjacent to the second filter plate, and the pull rope is threaded through the drain pipe.

[0023] By adopting the above technical solution, when the rainfall is heavy, the planting box moves down and the support rod moves closer by pulling the rope. The support rod compresses the conveying sponge, so that the conveying pipe forms a larger channel, so that the water of the first planting layer can flow into the water storage area through the conveying pipe, further improving the drainage capacity.

[0024] Optionally, a drag-reducing tube is provided in the first planting layer, one end of which is connected to the drainage pipe and the other end of which is connected to the delivery pipe; multiple pull ropes are provided, some of which pass through the end of the drainage pipe and are connected to the support rod, and other pull ropes pass through the drag-reducing tube and are connected to the support rod.

[0025] By adopting the above technical solution, the force on both ends of the support rod is more uniform, and the compression at both ends of the conveying sponge is more uniform, thus ensuring the drainage effect of the conveying pipe when the rainfall is heavy.

[0026] On the other hand, this application provides a construction method for a rain garden-style central median drainage structure, comprising the following steps:

[0027] S1: The trench is dug in the middle of the road and concrete is poured to form the trench wall. When pouring the concrete, a support flange for supporting the first filter plate is formed at the same time. The length of the support flange is the same as the length of the first filter plate.

[0028] S2: Connect the delivery pipe filled with the delivery sponge to the bottom of the groove;

[0029] S3: The first filter plate is mounted on the supporting flange, and the conveying pipe passes through the first filter plate during mounting;

[0030] S4: Connect the second filter plate to the end of the first filter plate;

[0031] S5: The first planting layer is laid on the first filter plate.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By setting a gap between adjacent first filter plates and making the first filter plates arc-shaped, and setting second filter plates at both ends of the first filter plates, when there is a lot of rainfall, rainwater is guided to the gap between the adjacent first filter plates. This water is filtered by the second filter plates and enters the water storage area under the first filter plates for storage. When there is little rainfall, the conveying component transports the water in the water storage area to the first planting layer, thereby reducing the difference in soil moisture content in the central dividing strip between the rainy season and the dry season.

[0034] 2. By placing filter sponges between adjacent second filter plates and placing a planting box with a second planting layer on top of the filter sponges, the aesthetics of the central divider are improved.

[0035] 3. By sliding the planting box to the wall of the trench with grooves and installing a drainage pipe in the first planting layer, the drainage capacity of the drainage structure is improved by connecting the planting box and the support rod with a rope. Attached Figure Description

[0036] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0037] Figure 2 This is a structural diagram used to illustrate the dovetail ridge and dovetail groove.

[0038] Figure 3 yes Figure 1 Enlarged diagram in section B.

[0039] Figure 4 yes Figure 1 Enlarged diagram of part A.

[0040] Explanation of reference numerals in the attached drawings: 1. Groove; 11. Dovetail groove; 2. Filter assembly; 21. First filter plate; 22. Second filter plate; 23. First planting layer; 231. Drainage pipe; 24. Second planting layer; 25. Filter sponge; 251. Support spring; 26. Third filter plate; 27. Planting box; 271. Dovetail ridge; 272. Pull rope; 28. Drag-reducing pipe; 3. Conveying assembly; 31. Conveying pipe; 32. Conveying sponge; 321. Sponge sheet; 33. Support rod; 34. Guide plate; 4. Water storage area. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0042] This application discloses a rain garden-style central median drainage structure.

[0043] Reference Figure 1A rain garden-style central median drainage structure includes a trench 1 dug in the center of the road, a filter assembly 2, and a conveying assembly 3. The filter assembly 2 includes a first filter plate 21 and second filter plates 22 disposed at both ends of the first filter plate 21. The first filter plate 21 is supported on the trench wall of the trench 1, a first planting layer 23 is disposed above the first filter plate 21, and a water storage area 4 is disposed below the first filter plate 21. Multiple first filter plates 21 are provided, arranged at intervals along the length of the trench 1, with the surface of the first filter plate 21 being arc-shaped. The second filter plates 22 extend along the height of the trench 1.

[0044] The delivery assembly 3 includes multiple delivery pipes 31, one end of which extends into the water storage area 4, and the other end extends into the first planting layer 23. Multiple water inlets are provided on both the pipe wall in the water storage area 4 and the pipe wall in the soil. Delivery pipes 31 are filled with delivery sponges 32, one end of which extends into the first planting layer 23, and the other end extends into the water in the water storage area 4.

[0045] When rainfall is heavy, rainwater falls on the first planting layer 23. Part of the rainwater in the first planting layer 23 is filtered and falls into the water storage area 4, while the other part flows to both ends of the first planting layer 23 and falls between adjacent second filter plates 22. After being filtered by the second filter plates 22, it enters the water storage area 4 for storage. When rainfall is light, the conveying sponge 32 and the conveying pipe 31 transport water from the water storage area 4 to the first planting layer 23 to replenish its moisture. This effectively guides most of the water between the adjacent second filter plates 22 and into the water storage area 4 during periods of heavy rainfall, reducing the drainage pressure on the first planting layer 23. Furthermore, during periods of light rainfall, the conveying component 31 replenishes the first planting layer 23 with water, thereby reducing the difference in soil moisture content in the central divider between the rainy and dry seasons.

[0046] The height of the second filter plate 22 is higher than that of the first planting layer 23, so that the water is filtered by the upper part of the second filter plate 22 before it flows into the space between the adjacent second filter plates 22, reducing the risk of impurities such as leaves entering the space between the adjacent second filter plates 22.

[0047] In other embodiments, the second filter plate 22 may also be at the same height as both ends of the first filter plate 21. In this case, the bottom of the second filter plate 22 needs to abut against the bottom of the groove 1, or a third filter plate 26 needs to be installed at the bottom of the second filter plate 22 to connect adjacent second filter plates 22, thereby reducing the risk of impurities such as leaves entering the water storage area 4. Once a large amount of impurities accumulates between the second filter plates 22, they can be cleaned.

[0048] Furthermore, in this embodiment, a filter sponge 25 is provided between adjacent first filter plates 21. The filter sponge 25 is used to fill the gap between adjacent second filter plates 22, thereby using the filter sponge 25 to filter the water flow entering the water storage area 4 from the second filter plate 22, further reducing the amount of impurities entering the water storage area 4.

[0049] In this embodiment, a third filter plate 26 is connected to the bottom of the second filter plate 22. The third filter plate 26 is used to connect two adjacent second filter plates 22 to each other. There is a gap between the third filter plate 26 and the bottom of the groove 1, so that the filter sponge 25 is supported by the third filter plate 26, and the water storage area 4 under the adjacent first filter plate 21 is interconnected.

[0050] In other embodiments, sand or gravel can be filled between two adjacent second filter plates 22 to achieve the same effect as the filter sponge 25.

[0051] Furthermore, in this embodiment, a second planting layer 24 is provided above the filter sponge 25 for planting plants, specifically water-loving plants, to improve the aesthetics of the central divider. It is understood that the upper surface of the second planting layer 24 is flush with both ends of the upper surface of the first planting layer 23, so that water in the first planting layer 23 can flow smoothly between adjacent first planting layers 23.

[0052] Furthermore, in this embodiment, a planting box 27 is disposed above the filter sponge 25, and the second planting layer 24 is located inside the planting box 27. The planting box 27 is slidably connected to the wall of the groove 1. A support spring 251 is disposed in the filter sponge 25, one end of the support spring 251 is connected to the bottom of the groove 1, and the other end is connected to the bottom wall of the planting box 27. The filter sponge 25 and the support spring 251 work together to support the planting box 27, preventing excessive deformation of the filter sponge 25 and ensuring its water absorption capacity. Furthermore, since the planting box 27 is slidably connected to the wall of the trench 1, when a large amount of water flows into the planting box 27, its mass increases, compressing the filter sponge 25 and the support spring 251. The planting box 27 slides downwards, increasing the volume of the area between adjacent first planting layers 23 used for water storage, thus temporarily storing water. Part of this water flows into the water storage area 4 through the second planting layer 24 and the filter sponge 25, while another part flows into the water storage area 4 through the second filter plate 22 and the first planting layer 23. When rainfall is excessive, the upper surface of the planting box 27 is lower than the lower surface of the first planting layer 23, allowing water in the second planting layer 24 to directly enter the water storage area 4 after being filtered by the vegetation and the second filter plate 22, thereby reducing drainage pressure and improving drainage efficiency.

[0053] Reference Figure 2 The specific structure for the sliding connection between the planting box 27 and the trench wall of the groove 1 is as follows: the outer wall of the planting box 27 is integrally formed with a dovetail protrusion 271, and the trench wall of the groove 1 is provided with a dovetail groove 11, which extends along the height direction of the groove 1 and is used for the dovetail protrusion 271 to slide and insert. This allows the planting box 27 to be detachably connected to the trench wall of the groove 1, facilitating the replacement of the filter sponge 25 and the plants between adjacent first planting layers 23. It is understood that in this embodiment, the end of the support spring 251 abuts against the bottom wall of the planting box 27.

[0054] Reference Figure 1 and Figure 3 Furthermore, a drain pipe 231 is provided in the first planting layer 23. One end of the drain pipe 231 extends to the water storage area 4, and the other end abuts against the surface of the second filter plate 22 facing away from the planting box 27. When the second planting layer 24 is at the same height as the first planting layer 23, the planting box 27 abuts against the end of the drain pipe 231. With this design, when there is a lot of rainfall, after the planting box 27 moves down, the end of the drain pipe 231 is exposed. A portion of the water above the second planting layer 24 is filtered by the second filter plate 22 and then directly enters the water storage area 4 through the drain pipe 231, further improving the drainage capacity.

[0055] Reference Figure 3 and Figure 4 Furthermore, the conveying sponge 32 is provided with a support rod 33 inside. The support rod 33 extends along the length of the conveying sponge 32. When the sponge needs to be replaced, the support rod 33 is pulled out from the conveying pipe 31, and the conveying sponge 32 is brought out from the conveying pipe 31 by the support rod 33, which is convenient and quick.

[0056] In this embodiment, the end of the support rod 33 extending to the water storage area 4 is integrally formed with a guide plate 34. The side wall of the guide plate 34 is used to abut against the pipe wall of the conveying pipe 31. On the one hand, it plays a certain guiding role when installing the conveying sponge 32. On the other hand, when the conveying sponge 32 is removed, the guide plate 34 is used to bring out all the conveying sponge 32 in the conveying pipe 31 to prevent debris from remaining in the conveying pipe 31 and eventually falling into the water storage area 4 to rot and affect the water quality.

[0057] Reference Figure 4The specific structure for connecting the conveying sponge 32 and the support rod 33 can be that the support rod 33 is bonded and fixed to the side wall of the conveying sponge 32; or the conveying sponge 32 can include multiple sheet-like sponge pieces 321, the periphery of which is used to abut against the wall of the conveying pipe 31, and the middle of the sponge piece 321 is provided with a through hole for the support rod 33 to pass through. Multiple sponge pieces 321 are sleeved on the support rod 33 along the length direction of the support rod 33, thereby making the connection between the support rod 33 and the conveying sponge 32 more convenient, and on the other hand, making it easy to adjust the length of the conveying sponge 32 by adjusting the number of sponge pieces 321 according to the actual installation situation.

[0058] In addition, after the conveying sponge 32 is pulled out from the conveying pipe 31, an aeration pipe connected to an aeration fan can be inserted into the conveying pipe 31. Air is blown into the second planting layer 24 through the aeration pipe, which on the one hand loosens the soil around the water inlet and reduces the risk of water inlet blockage, and on the other hand provides oxygen to the first planting layer 23 and improves the microbial activity of the first planting layer 23.

[0059] Reference Figure 3 In this embodiment, the support rod 33 adjacent to the second filter plate 22 is connected to the side of the conveying sponge 32 away from the second filter plate 22. The planting box 27 is connected to a pull rope 272, the end of which is connected to the support rod 33 adjacent to the second filter plate 22. The pull rope 272 passes through the drain pipe 231. With this design, when rainfall is heavy, the planting box 27 moves downwards, and the pull rope 272 pulls the support rod 33 closer, compressing the conveying sponge 32. This creates a larger channel in the conveying pipe 31, allowing water from the first planting layer 23 to flow into the water storage area 4 through the conveying pipe 31, further improving drainage capacity.

[0060] It is understandable that, in order to ensure the compression effect of the support rod 33 on the conveying sponge 32, the support rod 33 in this embodiment is a sheet structure; at the same time, in order to ensure the water conveying capacity of the conveying sponge 32 under normal conditions, multiple seepage outlets connected to the water inlet are opened at both ends of the support rod 33.

[0061] Furthermore, a drag-reducing pipe 28 is provided in the first planting layer 23. One end of the drag-reducing pipe 28 is connected to the drainage pipe 231, and the other end is connected to the conveying pipe 31. Multiple pull ropes 272 are provided. Some of the pull ropes 272 pass through the end of the drainage pipe 231 and are connected to the support rod 33. Other pull ropes 272 pass through the drag-reducing pipe 28 and are connected to the support rod 33. This makes the force on both ends of the support rod 33 more uniform, and the compression of both ends of the conveying sponge 32 more uniform, ensuring the drainage effect of the conveying pipe 31 when the rainfall is large.

[0062] This application also discloses a construction method for a rain garden-style central median drainage structure, including the following steps:

[0063] S1: A trench 1 is dug in the center of the road and concrete is poured to form the trench wall of the trench 1. When pouring the concrete, a support flange for supporting the first filter plate 21 is formed at the same time. The length of the support flange is equal to the length of the first filter plate 21.

[0064] S2: Weld and fix the conveying pipe 31, which is connected to the pull rope 272 and filled with the conveying sponge 32, to the bottom of the trench 1.

[0065] S3: According to the arrangement of the conveying pipe 31, a through hole is opened in the first filter plate 21 for the conveying pipe 31 to pass through; the first filter plate 21 with the through hole is mounted on the support flange.

[0066] S4: Connect two second filter plates 22 through the third filter plate 26. The connection method can be welding or hinge. Connect the two second filter plates 22 connected to the third filter plate 26 to two adjacent first filter plates 21 respectively. The connection method can be welding or hinge.

[0067] S5: Place a filter sponge 25 and a support spring 251 on the third filter plate 26 and between the two adjacent second filter plates 22. Place a planting box 27 on the filter sponge 25 and fix the other end of the pull rope 272 to the planting box 27. The connection method can be binding, or the pull ropes 272 on both sides of the two adjacent second filter plates 22 can be connected to each other first, and then the planting box 27 can be pressed on the pull rope 272.

[0068] S6: Install a drain pipe 231 and a drag-reducing pipe 28 on the first filter plate 21. To ensure stable installation, a first connecting rod can be installed between the drain pipe 231 and the first filter plate 21. The two ends of the first connecting rod are respectively tied and fixed to the drain pipe 231 and the first filter plate 21. A second connecting rod is installed between the drag-reducing pipe 28 and the first filter plate 21. The two ends of the second connecting rod are respectively tied and fixed to the drag-reducing pipe 28 and the first filter plate 21.

[0069] S7: Set a first planting layer 23 on the first filter plate 21 and plant vegetation.

[0070] The implementation principle of the drainage structure of the central divider of the rain garden in this application embodiment is as follows: when the rainfall is small, the conveying component 3 conveys the water in the water storage area 4 to the first planting layer 23 to replenish the water for the plants planted in the first planting layer 23.

[0071] When rainfall is heavy, some of the water infiltrates into the first planting layer 23 and is filtered by the first planting layer 23 and the first filter plate 21 before entering the water storage area 4; some water flows to the second planting layer 24 and is filtered by the second planting layer 24, the filter sponge 25 and the second filter plate 22 before entering the water storage area 4 for storage.

[0072] When the rainfall is greater, the planting box 27 moves down, and the water in the first planting layer 23 flows directly into the water storage area 4 through the drain pipe 231 after being filtered by the second filter plate 22.

[0073] When the rainfall is heavy, the planting box 27 continues to move downwards, and the upper surface of the second planting layer 24 is lower than the lower surface of the first planting layer 23. The water in the second planting layer 24 enters the water storage area 4 directly through the second filter plate 22.

[0074] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rain garden-style central median drainage structure, characterized in that: The system includes a trench (1) dug in the center of the road, a filter assembly (2), and a conveying assembly (3); the filter assembly (2) includes a first filter plate (21) and second filter plates (22) disposed at both ends of the first filter plate (21). The first filter plate (21) is mounted on the trench wall of the trench (1), a first planting layer (23) is disposed above the first filter plate (21), and a water storage area (4) is disposed below the first filter plate (21); multiple first filter plates (21) are provided, and multiple first filter plates (21) are arranged at intervals along the length direction of the trench (1), and the plates of the first filter plates (21) are... The surface is arc-shaped; the second filter plate (22) extends along the height direction of the groove (1); the conveying assembly (3) includes multiple conveying pipes (31), one end of the conveying pipe (31) extends to the water storage area (4), and the other end extends into the first planting layer (23); the pipe wall of the conveying pipe (31) in the water storage area (4) and the pipe wall in the first planting layer (23) are provided with multiple water inlets; the conveying pipe (31) is filled with a conveying sponge (32), one end of the conveying sponge (32) extends to the first planting layer (23), and the other end extends into the water in the water storage area (4); A filter sponge (25) is provided between adjacent first filter plates (21), and the filter sponge (25) is used to fill the gap between adjacent second filter plates (22); The conveying sponge (32) is provided with a support rod (33) inside, and the support rod (33) extends along the length direction of the conveying sponge (32); A planting box (27) is provided above the filter sponge (25), and a second planting layer (24) is located in the planting box (27); the planting box (27) is slidably connected to the groove wall of the groove (1); a support spring (251) is provided in the filter sponge (25), one end of the support spring (251) is connected to the bottom of the groove (1), and the other end is connected to the bottom wall of the planting box (27); The support rod (33) adjacent to the second filter plate (22) is connected to the side of the conveying sponge (32) away from the second filter plate (22); the planting box (27) is connected to a pull rope (272), one end of the pull rope (272) away from the planting box (27) is connected to the support rod (33) adjacent to the second filter plate (22), and the pull rope (272) is threaded through the drain pipe (231).

2. The rain garden-style central median drainage structure according to claim 1, characterized in that: The height of the second filter plate (22) is higher than the height of the first planting layer (23).

3. The rain garden-style central median drainage structure according to claim 1, characterized in that: A second planting layer (24) is provided above the filter sponge (25), and the upper surface of the second planting layer (24) is flush with both ends of the upper surface of the first planting layer (23).

4. The rain garden-style central median drainage structure according to claim 1, characterized in that: A drain pipe (231) is provided in the first planting layer (23). One end of the drain pipe (231) extends to the water storage area (4), and the other end abuts against the surface of the second filter plate (22) away from the planting box (27). When the second planting layer (24) is at the same height as the first planting layer (23), the planting box (27) abuts against the end of the drain pipe (231).

5. A rain garden-style central median drainage structure according to claim 1, characterized in that: The first planting layer (23) is provided with a drag-reducing tube (28), one end of which is connected to the drain pipe (231) and the other end is connected to the delivery pipe (31); multiple pull ropes (272) are provided, one part of which is passed through the end of the drain pipe (231) and connected to the support rod (33), and another part of which is passed through the drag-reducing tube (28) and connected to the support rod (33).

6. A construction method for a rain garden-style central median drainage structure according to any one of claims 1-5, characterized in that: Includes the following steps: S1: The trench (1) is dug in the middle of the road and concrete is poured to form the trench wall of the trench (1). When pouring concrete, a support flange for supporting the first filter plate (21) is formed at the same time. The length of the support flange is the same as the length of the first filter plate (21). S2: Connect the delivery pipe (31) filled with the delivery sponge (32) to the bottom of the groove (1); S3: The first filter plate (21) is mounted on the support flange, and the conveying pipe (31) passes through the first filter plate (21) during mounting. S4: Connect the second filter plate (22) to the end of the first filter plate (21); S5: The first planting layer (23) is arranged on the first filter plate (21).

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