Pollution discharge well lid for sponge city road

By designing sewage manhole covers for sponge city roads and using a combination of adjustable plates and expansion joints, dynamic adjustment based on changes in water flow is achieved, solving the problem of urban waterlogging caused by the inability of traditional manhole covers to be adjusted, and improving drainage efficiency.

CN120990225APending Publication Date: 2025-11-21TIANJIN BINHAI NEW AREA URBAN PLANNING & DESIGN INST CO LTD
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Patent Information

Application Number
CN202511175091.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Traditional sewage manhole covers cannot adjust according to changes in water flow, which makes urban roads prone to waterlogging during extreme weather conditions such as heavy rain.

Method used

A sewage manhole cover for sponge city roads has been designed, comprising a cover body, an adjusting plate, and a telescopic component. By rotating the adjusting plate and controlling the telescopic component, the water flow can be dynamically adjusted to meet the drainage needs of different water flow rates.

Benefits of technology

The manhole cover can be adjusted according to changes in actual water flow, improving drainage efficiency, reducing urban flooding, and meeting the drainage needs of sponge city roads.

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Abstract

The invention discloses a sewage draining well lid for a sponge city road, and belongs to the technical field of urban drainage systems, and the technical scheme is that the sewage draining well lid comprises a lid body, the lid body is provided with a water inlet hole, a temporary storage cavity and a water outlet hole, and the water inlet hole, the temporary storage cavity and the water outlet hole are sequentially communicated to form a channel for water to penetrate through; the adjusting plate is arranged in the temporary storage cavity, one end of the adjusting plate is rotationally connected with the cover body, and a through hole is formed in the adjusting plate; the telescopic piece is connected with the cover body and used for adjusting the rotating position of the adjusting plate; wherein the diameter of the through hole is smaller than that of the water outlet hole, when the bottom of the adjusting plate abuts against the cover body, the through hole coincides with the water outlet hole, the water flow of the water outlet hole can be limited, and when the adjusting plate is lifted up, limitation on the water flow of the water outlet hole can be reduced; the effect of reducing the problems of urban road waterlogging and the like is achieved.
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Description

Technical Field

[0001] This application relates to the field of urban drainage system technology, and in particular to a sewage manhole cover for sponge city roads. Background Technology

[0002] With the acceleration of urbanization, urban road drainage problems are becoming increasingly prominent. Sponge cities, as a new urban construction concept, emphasize the city's functions of water absorption, storage, purification, and release. In this context, traditional sewage manhole covers can no longer meet the drainage needs of sponge city roads. Existing sewage manhole covers typically only have simple opening and closing functions and cannot adjust accordingly to changes in water flow, leading to waterlogging and other problems on urban roads during extreme weather events such as heavy rain. Summary of the Invention

[0003] In order to reduce the occurrence of urban road waterlogging and other problems, this invention provides a sewage manhole cover for sponge city roads.

[0004] The present invention provides a sewage manhole cover for sponge city roads, which adopts the following technical solution: A type of sewage manhole cover for sponge city roads, comprising: The cover has a water inlet, a temporary storage chamber and a water outlet, which are connected in sequence to form a channel for water supply. An adjustment plate is disposed in the temporary storage cavity, one end of the adjustment plate is rotatably connected to the cover, and a through hole is provided on the adjustment plate; A telescopic component, connected to the cover, is used to adjust the position of the adjusting plate. Wherein, the diameter of the through hole is smaller than the diameter of the water outlet hole. When the bottom of the adjusting plate abuts against the cover, the through hole coincides with the water outlet hole, which can limit the water flow of the water outlet hole. When the adjusting plate is raised, the limitation on the water flow of the water outlet hole can be reduced.

[0005] By adopting the above technical solution, during rainfall, water enters the temporary storage chamber through the inlet hole and then flows out of the manhole cover through the through hole and the outlet hole. Since the diameter of the through hole is smaller than that of the inlet hole, it limits the water flow rate at the outlet hole, thus meeting normal drainage needs. In extreme weather conditions such as heavy rain, the telescopic component raises the adjusting plate, reducing the restriction of the through hole on the outlet hole and allowing water in the temporary storage chamber to flow more easily into the outlet hole. This manhole cover can adjust accordingly to changes in actual water flow, thereby meeting the drainage needs of sponge city roads, improving drainage efficiency, and effectively reducing urban flooding.

[0006] Preferably, one end of the adjusting plate is hinged to the cover, the sidewall of the temporary storage cavity is inclined, and the top area is larger than the bottom area.

[0007] By adopting the above technical solution, the temporary storage cavity will not interfere with the regulating plate during the upward lifting process, and the water can be dispersed from all sides of the regulating plate to the outlet hole, reducing the resistance of the water flowing from the inlet hole to the outlet hole.

[0008] Preferably, the cover has a first region and a second region, which are continuously and alternately arranged along the circumference of the cover. The second region has a first guide groove and a second guide groove. There are multiple first guide grooves, which are distributed at intervals along the radial direction of the cover. The second guide grooves are connected to the multiple first guide grooves.

[0009] By adopting the above technical solution, the first and second diversion channels work together to better disperse and guide the water flow, thereby further improving drainage efficiency.

[0010] Preferably, the water inlet includes a first hole and a second hole. The first hole is located in the first region, and multiple second holes are provided, all of which are located on the first guide groove. The temporary storage cavity is located below the second holes and communicates with the multiple second holes.

[0011] By adopting the above technical solution, water entering through the second hole can enter the temporary storage chamber more smoothly, and the large number of second holes can increase the water intake and improve the sewage discharge efficiency.

[0012] Preferably, the temporary storage cavity is provided with a support assembly for supporting the top of the cover, and the support assembly is connected to the adjustment plate.

[0013] By adopting the above technical solution, the support component can support the cover itself and enhance the stability of the cover structure.

[0014] Preferably, the support assembly includes a first support rod and a second support rod. The first end of the first support rod is fixedly connected to the adjusting plate, and the second end is hinged to the first end of the second support rod. There is a distance between the first ends of the first support rod and the second support rod. The second end of the second support rod is slidably connected to the adjusting plate. When the bottom of the adjusting plate abuts against the cover, the second support rod is in a vertical state and its top abuts against the cover.

[0015] By adopting the above technical solution, under normal conditions, the bottom of the adjustment plate abuts against the cover, and the second support rod and the first support rod work together to support the cover, thereby increasing the support force of the cover and making the cover less prone to deformation when vehicles pass over it, thus increasing its service life.

[0016] Preferably, the adjusting plate has a sliding groove, which includes a first sliding part and a second sliding part. The first sliding part is located on the side of the second sliding part and communicates with the second sliding part. A sliding assembly is provided between the second support rod and the adjusting plate. The sliding assembly includes a mounting bracket and a slider. The mounting bracket is located on the first sliding part and is hinged to the second end of the second support rod. The slider is connected to the mounting bracket and is located in the second sliding part. Both the mounting bracket and the slider are slidably connected to the adjusting plate, enabling the second support rod to slide relative to the adjusting plate.

[0017] By adopting the above technical solution, the stable sliding of the second support rod is achieved through the cooperation of the mounting bracket and the slider.

[0018] Preferably, the sliding assembly further includes a gear and a rack. The gear is rotatably connected to the mounting bracket, and the rack is disposed in the first sliding part and fixedly connected to the adjusting plate. The rack is located at one end of the sliding groove near the first support rod. When the second support rod is in a vertical state, the rack meshes with the gear.

[0019] By adopting the above technical solution, when the second support rod is in a vertical position, the rack and gear mesh, locking the position of the second support rod. Simultaneously, when the adjusting plate is raised, it facilitates the second support rod's transition from a vertical to a tilted position, allowing the adjusting plate to move normally.

[0020] Preferably, the bottom of the gear is higher than the bottom surface of the first sliding part.

[0021] By adopting the above technical solution, the part of the gear without the rack in the first sliding section will not wear against the adjusting plate, increasing the service life of the gear. At the same time, the bottom of the gear is higher than the bottom surface of the first sliding section, and the rack can mesh with the gear, which means that the top surface of the rack is also higher than the bottom surface of the first sliding section.

[0022] Preferably, the temporary storage cavity is provided with a liquid level sensor connected to the cover, the liquid level sensor is electrically connected to a control module, and the control module is electrically connected to the telescopic component.

[0023] By adopting the above technical solution, when encountering extreme weather such as heavy rain, the control module receives the water level rise signal sent by the liquid level sensor, and drives the adjustment plate to lift through the telescopic component, reducing the restriction on the water flow of the outlet hole, thereby realizing large-flow drainage and reducing the possibility of urban flooding.

[0024] In summary, the present invention has the following beneficial effects: During rain, water enters the temporary storage chamber through the inlet hole and then flows out of the manhole cover through the through hole and outlet hole. Because the diameter of the through hole is smaller than that of the inlet hole, it limits the water flow rate at the outlet hole, thus meeting normal drainage needs. In extreme weather conditions such as heavy rain, the telescopic component raises the adjusting plate, reducing the restriction of the through hole on the outlet hole and allowing water in the temporary storage chamber to flow more easily into the outlet hole. This manhole cover can adjust accordingly to changes in actual water flow, thereby meeting the drainage needs of sponge city roads, improving drainage efficiency, and effectively reducing urban flooding. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a sewage manhole cover for sponge city roads.

[0026] Figure 2 This is a bottom view of a sewage manhole cover.

[0027] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0028] Figure 4 The purpose is to show the connection between the first hole and the temporary storage cavity.

[0029] Figure 5 This is a partial schematic diagram of the adjustment plate.

[0030] Figure 6 yes Figure 3 Enlarged diagram in the image.

[0031] Explanation of reference numerals in the attached figures: 1. Cover; 11. Water inlet; 111. First hole; 112. Second hole; 12. Temporary storage chamber; 13. Water outlet; 14. First guide channel; 15. Second guide channel; 2. Adjusting plate; 21. Through hole; 22. Sliding groove; 221. First sliding part; 222. Second sliding part; 23. Placement groove; 3. Liquid level sensor; 4. Telescopic component; 5. Support assembly; 51. First support rod; 52. Second support rod; 6. Sliding assembly; 61. Mounting bracket; 62. Slider; 63. Gear; 64. Rack; 7. Shielding assembly; 71. Baffle; 72. Spring. Detailed Implementation

[0032] Words such as "for example" or "for instance" are intended to present related concepts in a specific way.

[0033] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] A type of sewage manhole cover for sponge city roads, referring to Figure 1 , Figure 2 and Figure 3 The system includes a cover 1, an adjusting plate 2, and a telescopic component 4. The cover 1 has a water inlet 11, a temporary storage chamber 12, and a water outlet 13, which are sequentially connected to form a water supply channel. The adjusting plate 2 is located within the temporary storage chamber 12, with one end rotatably connected to the cover 1. The adjusting plate 2 has a through hole 21, the diameter of which is smaller than the diameter of the water outlet 13. The telescopic component 4 is connected to the cover 1 and is used to adjust the rotational position of the adjusting plate 2. When the bottom of the adjusting plate 2 abuts against the cover 1, the through hole 21 coincides with the water outlet 13, thus limiting the water flow rate of the water outlet 13. When the adjusting plate 2 is raised, the restriction on the water flow rate of the water outlet 13 is reduced.

[0036] During rain, water enters the temporary storage chamber 12 through the inlet hole 11 and then flows out of the manhole cover through the through hole 21 and the outlet hole 13. Since the diameter of the through hole 21 is smaller than the diameter of the inlet hole 11, the diameter of the through hole 21 limits the water flow rate of the outlet hole 13, thus meeting normal drainage needs. In extreme weather conditions such as heavy rain, the telescopic component 4 raises the adjusting plate 2, reducing the restriction of the through hole 21 on the outlet hole 13, allowing water in the temporary storage chamber 12 to flow more easily into the outlet hole 13. This manhole cover can adjust accordingly to changes in actual water flow, thereby meeting the drainage needs of sponge city roads, improving drainage efficiency, and effectively reducing urban flooding.

[0037] Reference Figure 1 The cover 1 has a first region and a second region, which are continuously staggered along the circumference of the cover 1. In this embodiment, there are two of each of the first and second regions, with the two first regions and the two second regions arranged diagonally opposite each other.

[0038] Reference Figure 1The second region of the cover 1 is provided with a first guide channel 14 and a second guide channel 15. The first guide channel 14 is arc-shaped and multiple are provided; in this embodiment, three are provided. The three first guide channels 14 are distributed radially at intervals along the cover 1, and the length of the first guide channels 14 gradually increases. The second guide channel 15 connects the three first guide channels 14, and the depth of the second guide channel 15 is less than the depth of the first guide channel 14.

[0039] The first guide channel 14 and the second guide channel 15 work together to better disperse and guide the water flow, further improving drainage efficiency.

[0040] Reference Figure 1 The water inlet 11 includes a first hole 111 and a second hole 112. There are two first holes 111, and each first hole 111 corresponds to a first area. There are multiple second holes 112, which are evenly distributed in the first guide channel 14. Sewage can be discharged from all areas of the cover 1.

[0041] Reference Figure 1 , Figure 3 and Figure 4 There are two symmetrically arranged temporary storage cavities 12, and the two temporary storage cavities 12 correspond one-to-one with the two second regions. The temporary storage cavity 12 is located below the second hole 112 of the corresponding region and is connected to the second hole 112 of the corresponding region. The temporary storage cavity 12 is connected to the first hole 111 through a connecting channel.

[0042] Water from both the first hole 111 and the second hole 112 can flow into the temporary storage chamber 12. Water entering from the second hole 112 flows into the temporary storage chamber 12 more smoothly. The large number of second holes 112 can increase the water inflow and improve the sewage discharge efficiency.

[0043] Reference Figure 3 Two adjusting plates 2 are symmetrically arranged, each corresponding to one of the two temporary storage cavities 12. The end of the adjusting plate 2 furthest from the edge of the cover 1 is rotatably connected to the cover 1. The bottom surface of the temporary storage cavity 12 is inclined, and slopes upwards from one end near the edge of the cover 1 to the other. The adjusting plate 2 is inclined when its bottom abuts against the cover 1. The side walls of the temporary storage cavity 12 are inclined, and its top area is larger than its bottom area.

[0044] When water enters the temporary storage chamber 12 from the inlet hole 11, the inclined regulating plate 2 can guide the flow, facilitating the water to flow into the through hole 21. During the upward lifting of the regulating plate 2, the temporary storage chamber 12 will not interfere with the regulating plate 2, and can disperse the water from all sides of the regulating plate 2 to the outlet hole 13, reducing the resistance of the water entering from the inlet hole 11 to the outlet hole 13.

[0045] Reference Figure 3The telescopic component 4 uses a cylinder, electric push rod, etc. A liquid level sensor 3 is fixedly connected to the top of the temporary storage chamber 12. The liquid level sensor 3 is electrically connected to a control module, and the control module is electrically connected to the telescopic component 4.

[0046] When encountering extreme weather such as heavy rain, the control module receives the water level rise signal sent by the liquid level sensor 3, and drives the adjustment plate 2 to lift through the telescopic component 4, reducing the restriction on the water flow of the outlet hole 13, thereby realizing large-flow drainage and reducing the possibility of urban flooding.

[0047] Reference Figure 2 and Figure 4 There are multiple through holes 21. In this embodiment, there are four through holes 21 and four water outlet holes 13.

[0048] Reference Figure 5 A support assembly 5 is provided inside the temporary storage cavity 12. The support assembly 5 includes a first support rod 51 and a second support rod 52. One end of the first support rod 51 is fixedly connected to the adjusting plate 2, and the other end is hinged to the second support rod 52, with a distance between the first ends of the first support rod 51 and the second support rod 52. The second end of the second support rod 52 is connected to a sliding assembly 6, and is slidably connected to the adjusting plate 2 through the sliding assembly 6. When the bottom of the adjusting plate 2 abuts against the cover 1, the second support rod 52 is vertically positioned, and the top of the second support rod 52 abuts against the cover 1.

[0049] In normal operation, the bottom of the adjusting plate 2 abuts against the cover 1. The second support rod 52 and the first support rod 51 work together to support the cover 1, thereby increasing the support force of the cover and making the cover 1 less prone to deformation when a vehicle passes over it, thus increasing its service life.

[0050] Reference Figure 5 The top of the adjusting plate 2 is provided with a sliding groove 22. The sliding groove 22 includes a first sliding part 221 and a second sliding part 222. There are two second sliding parts 222, which are respectively located on both sides of the first sliding part 221 and are connected to the first sliding part 221.

[0051] Reference Figure 5 The sliding assembly 6 includes a mounting bracket 61, a slider 62, a gear 63, and a rack 64. The mounting bracket 61 is inverted U-shaped and is located within the first sliding portion 221, with a gap between the mounting bracket 61 and the bottom surface of the first sliding portion 221. The top of the mounting bracket 61 is hinged to the second end of the second support rod 52. Two sliders 62 are provided, each located on one side of the mounting bracket 61 and fixedly connected to it. Each slider 62 corresponds to a second sliding portion 222, and is located within the corresponding second sliding portion 222 and slidably connected to the adjusting plate 2.

[0052] Reference Figure 5Gear 63 is positioned between mounting brackets 61 and rotatably connected to them via a shaft. The bottom of gear 63 is higher than the bottom surface of the first sliding part 221. Rack 64 is positioned in the first sliding part 221 and fixedly connected to the adjusting plate 2. The top surface of rack 64 is higher than the bottom surface of the first sliding part 221. When the second support rod 52 is in a vertical position, gear 63 meshes with rack 64.

[0053] The sliding assembly 6 slides within the slide groove 22 via the mounting bracket 61 and the slider 62, thereby enabling the movement of the second support rod 52. Furthermore, the portion of the gear 63 within the first sliding section 221 without the rack 64 will not wear against the adjusting plate 2, increasing the service life of the gear 63.

[0054] Reference Figure 5 and Figure 6 An adjustment plate 2 has a placement groove 23. The placement groove 23 is located on the side of the first sliding part 221 near the rack 64 and communicates with the first sliding part 221. A blocking assembly 7 is provided in the placement groove 23, which includes a baffle 71 and a spring 72. The baffle 71 is L-shaped, with its vertical section located at the end of the horizontal section near the sliding groove 22. The baffle 71 is slidably connected to the adjustment plate 2. When the gear 63 meshes with the rack 64, the mounting bracket 61 abuts against the vertical section of the baffle 71. One end of the spring 72 is fixedly connected to the baffle 71, and the other end is fixedly connected to the adjustment plate 2. In its natural state, the baffle 71 extends out of the placement groove 23 and blocks the rack 64.

[0055] When the mounting bracket 61 drives the gear 63 to mesh with the rack 64, the mounting bracket 61 will cause the baffle 71 to retract into the placement groove 23. When the gear 63 disengages from the rack 64, the baffle 71 is pushed out of the placement groove 23 by the spring 72 and covers the top of the rack 64, reducing the possibility of impurities getting stuck in the rack 64.

[0056] The operating principle of this application is as follows: When it rains, water enters the temporary storage chamber 12 through the inlet hole 11, and then flows out of the manhole cover through the through hole 21 and the outlet hole 13. Since the diameter of the through hole 21 is smaller than the diameter of the inlet hole 11, the diameter of the through hole 21 limits the water flow rate of the outlet hole 13, thus meeting normal drainage requirements. At the same time, the first support rod is set vertically to provide support for the top of the cover, increasing the stability of the cover structure.

[0057] When encountering extreme weather such as heavy rain, the telescopic component 4 lifts the adjusting plate 2, and water flows from all sides of the adjusting plate 2 and through hole 21 to the outlet hole 13, reducing the restriction on the water flow of the outlet hole 13. This allows the manhole cover to be adjusted according to the actual water flow, thereby meeting the drainage needs of sponge city roads, improving drainage efficiency, and effectively reducing the occurrence of urban flooding.

[0058] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A sewage manhole cover for sponge city roads, characterized in that, include: The cover (1) is provided with a water inlet (11), a temporary storage cavity (12) and a water outlet (13). The water inlet (11), the temporary storage cavity (12) and the water outlet (13) are connected in sequence to form a channel for water supply. An adjustment plate (2) is provided in the temporary storage cavity (12). One end of the adjustment plate (2) is rotatably connected to the cover (1), and a through hole (21) is provided on the adjustment plate (2). Telescopic component (4) is connected to the cover (1) and is used to adjust the position of the adjusting plate (2) during rotation; Wherein, the diameter of the through hole (21) is smaller than the diameter of the water outlet (13). When the bottom of the adjusting plate (2) abuts against the cover (1), the through hole (21) coincides with the water outlet (13), which can limit the water flow of the water outlet (13). When the adjusting plate (2) is raised, it can reduce the restriction on the water flow of the water outlet (13).

2. The sewage manhole cover for sponge city roads according to claim 1, characterized in that: One end of the adjustment plate (2) is hinged to the cover (1), the side wall of the temporary storage cavity (12) is inclined, and the top area is larger than the bottom area.

3. A sewage manhole cover for sponge city roads according to claim 1, characterized in that: The cover (1) is provided with a first region and a second region. The first region and the second region are continuously staggered along the circumference of the cover (1). The second region is provided with a first guide groove (14) and a second guide groove (15). There are multiple first guide grooves (14) and they are distributed at intervals along the radial direction of the cover (1). The second guide groove (15) connects multiple first guide grooves (14).

4. A sewage manhole cover for sponge city roads according to claim 3, characterized in that: The water inlet (11) includes a first hole (111) and a second hole (112). The first hole (111) is located in the first region. There are multiple second holes (112), all of which are located on the first guide groove (14). The temporary storage cavity (12) is located below the second hole (112) and is connected to multiple second holes (112).

5. A sewage manhole cover for sponge city roads according to claim 1, characterized in that: The temporary storage cavity (12) is provided with a support assembly (5) for supporting the top of the cover (1), and the support assembly (5) is connected to the adjustment plate (2).

6. A sewage manhole cover for sponge city roads according to claim 5, characterized in that: The support assembly (5) includes a first support rod (51) and a second support rod (52). The first end of the first support rod (51) is fixedly connected to the adjusting plate (2), and the second end is hinged to the second support rod (52). There is a distance between the first end of the first support rod (51) and the first end of the second support rod (52). The second end of the second support rod (52) is slidably connected to the adjusting plate (2). When the bottom of the adjusting plate (2) abuts against the cover (1), the second support rod (52) is in a vertical state and its top abuts against the cover (1).

7. A sewage manhole cover for sponge city roads according to claim 6, characterized in that: The adjusting plate (2) is provided with a sliding groove (22), which includes a first sliding part (221) and a second sliding part (222). The first sliding part (221) is located on the side of the second sliding part (222) and communicates with the second sliding part (222). A sliding assembly (6) is provided between the second support rod (52) and the adjusting plate (2). The sliding assembly (6) includes a mounting bracket (61) and a slider (62). The mounting bracket (61) is located on the first sliding part (221) and is hinged to the second end of the second support rod (52). The slider (62) is connected to the mounting bracket (61) and is located in the second sliding part (222). Both the mounting bracket (61) and the slider (62) are slidably connected to the adjusting plate (2), which enables the second support rod (52) to slide relative to the adjusting plate (2).

8. A sewage manhole cover for sponge city roads according to claim 7, characterized in that: The sliding assembly (6) further includes a gear (63) and a rack (64). The gear (63) is rotatably connected to the mounting bracket (61). The rack (64) is located in the first sliding part (221) and is fixedly connected to the adjusting plate (2). When the second support rod (52) is in a vertical state, the rack (64) meshes with the gear (63).

9. A sewage manhole cover for sponge city roads according to claim 8, characterized in that: The bottom of the gear (63) is higher than the bottom surface of the first sliding part (221).

10. A sewage manhole cover for sponge city roads according to claim 1, characterized in that: The temporary storage cavity (12) is equipped with a liquid level sensor (3) connected to the cover (1). The liquid level sensor (3) is electrically connected to a control module, and the control module is electrically connected to the telescopic component (4).