Stacked well lid structure

Abstract

The utility model discloses a stacked well lid structure, which relates to municipal well maintenance engineering and comprises a well seat and a lid body, and the upper end of the well seat is provided with a mounting port for placing the lid body; a water inlet is formed in the upper end of the cover body, a drainage channel is formed in an inner cavity of the well base, a first step is arranged on the inner wall of the well base, a first partition plate is arranged on the first step, a first drainage port communicated with the drainage channel is formed in the first partition plate, and a second drainage port is formed in the first step; the second drainage port is used for draining fluid to the well wall at the bottom of the well seat; the first partition plate is close to the cover body and keeps a distance from the cover body; the lower end of the insertion column abuts against the first partition plate, and the insertion column is used for transmitting the load of the cover body to the first partition plate; the problem that after the surface of a current well lid is damaged, pedestrians or vehicles are greatly influenced is solved.

Description

Technical Field

[0001] The utility model relates to a municipal well maintenance project, in particular to a stacked well cover structure. Background Art

[0002] Manhole covers come in a variety of types. As essential infrastructure for municipal projects, manhole covers not only provide essential drainage but may also contain municipal pipelines. Therefore, they need to provide daily coverage and prevent pedestrians and vehicles from accidentally falling in. They also need to facilitate maintenance, allowing workers to access the manhole through the cover for maintenance. Existing manhole cover designs all feature drain ports, which drain during heavy rainfall and can be used to connect a hook to open the cover for maintenance. Current manhole covers present several challenges. While existing covers have anti-fall features, damage to the cover surface can easily cause vehicle tires to dent or pedestrians to fall. Furthermore, municipal manhole covers are susceptible to environmental influences due to the significant variations in the location and spatial distribution of their surface. For example, rainwater carrying street debris into the manhole cover can cause localized blockages, potentially inadequate drainage capacity to quickly remove accumulated water. For example, when water accumulates on roads or is flooded, the water flows through the manhole cover and the manhole seat to drain, causing sudden changes in flow speed and direction, which can easily generate noise. Therefore, it is worth studying how to reduce the damage caused by manhole covers and improve their adaptability under environmental influences. Utility Model Content

[0003] The purpose of the present invention is to provide a stacked manhole cover structure in order to improve the problem that the current manhole cover surface is damaged and has a significant impact on pedestrians or vehicles.

[0004] An embodiment of the present invention provides a specific drainage method for a manhole cover structure, in the hope of achieving better noise reduction or drainage effects in different drainage scenarios.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A stacked manhole cover structure includes a manhole seat and a cover body, wherein the upper end of the manhole seat is provided with a mounting port for placing the cover body; the upper end of the cover body is provided with a water inlet, the inner cavity of the manhole seat is provided with a drainage channel, the inner wall of the manhole seat is provided with a first step, a first partition is provided on the first step, a first drainage port connected to the drainage channel is provided on the first partition, and a second drainage port is provided on the first step; the second drainage port is used to drain the fluid to the manhole wall at the bottom of the manhole seat; the first partition is used to approach the cover body and maintain a distance from the cover body; the lower end of the cover body is provided with a plug column, the lower end of the plug column abuts against the first partition, and the plug column is used to transfer the load of the cover body to the first partition.

[0007] Preferably, a height difference is set between the upper end of the above-mentioned first step and the upper end of the first partition; a drainage area is set on the above-mentioned first partition, and the drainage area is located below the water inlet, and a drainage groove is provided on the above-mentioned drainage area, and the above-mentioned drainage groove gradually tilts from the inside to the outside of the first partition.

[0008] Preferably, the first partition is provided with a socket corresponding to the plug post, the socket being configured to contact the plug post, an isolation zone is provided on the first partition, the isolation zone is positioned around the socket, and the drainage zone is positioned around the isolation zone; a slope is provided on the isolation zone, and the slope slopes from the socket to the drainage zone. There are multiple drainage grooves, with a spacing between adjacent drainage grooves, and the first drain outlet is connected to at least one drainage groove.

[0009] Preferably, a positioning ring is provided on the edge of the first step, and the first partition is detachably mounted on the positioning ring; the bottom of the drainage groove is flush with the upper surface of the positioning ring.

[0010] A further technical solution is that there is a gap between the inner wall of the well seat and the positioning ring, which gap forms an overflow channel, and the overflow channel is connected to the second drain outlet. The inner wall of the positioning ring is provided with a second step, the edge of the first partition is in contact with the second step, and the upper end of the second step abuts against the lower end of the first partition.

[0011] A further technical solution is that a third drain port is provided on the positioning ring, and two ends of the third drain port are connected to the drainage channel and the overflow channel respectively.

[0012] A further technical solution is that there are multiple third drain outlets on the positioning ring, and the gaps between two adjacent drain outlets are the same.

[0013] Preferably, a reinforcement structure is provided in the drainage channel, and the upper end of the reinforcement structure is used to contact the first partition plate; a connecting rod is provided on the side wall of the reinforcement structure, and the end of the connecting rod is installed on the inner wall of the drainage channel.

[0014] Preferably, the above-mentioned reinforcement structure includes an anti-fall plate and a column, and the above-mentioned column is vertically installed on the anti-fall plate; the upper end of the above-mentioned column is used to contact the lower end of the first partition; wherein, the above-mentioned connecting rod is fixed on the side wall of the anti-fall plate, and the above-mentioned connecting rod is at least three, and the above-mentioned connecting rod is distributed around the central axis of the anti-fall plate.

[0015] A further technical solution is that the inner wall of the drainage channel is provided with a protrusion corresponding to the connecting rod, the side wall of the protrusion is provided with a groove for inserting the connecting rod, the lower end of the connecting rod is used to abut the bottom of the groove, and the protrusion supports the anti-fall plate through the connecting rod.

[0016] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0017] The present invention adopts a stacked manhole cover. By providing a first partition and ensuring a distance between the first partition and the cover body, the basic drainage function of the manhole cover is satisfied on the one hand. On the other hand, when the cover body is damaged, the first partition is used to assist, thereby reducing the falling height of the manhole mouth, thereby reducing the impact of the cover body damage on pedestrians or vehicles. More importantly, when the liquid drained by the cover body is small, the water is drained to the well wall through the second drain port on the premise that the water flows first into the second drain port, and it is expected that drainage through the well wall will reduce drainage noise. At the same time, the load is transferred through the first partition and the plug column, so that the upper limit of the safe load of the cover body is increased.

[0018] The utility model sets a drainage groove in the drainage area, which is beneficial for the liquid sent into the cover body to be well diverted, thereby reducing the drainage pressure of a single first drainage port. On the other hand, when the cover body is damaged, the drainage groove can also reduce the risk of local blockage.

[0019] The utility model also facilitates the disassembly and installation of the first partition through the design of the positioning ring. On the other hand, the third drain outlet is set through the positioning ring, and the first drain outlet, the second drain outlet and the third drain outlet are used in combination to improve the drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the docking between the well seat and the cover.

[0021] Figure 2 Schematic diagram of the first partition structure.

[0022] Figure 3 This is a schematic diagram of the cooperation between the first partition and the positioning ring.

[0023] Figure 4 This is the structural intention of the positioning ring.

[0024] Figure 5 It is a schematic diagram of the overall structure of the utility model.

[0025] Figure 6 This is a schematic diagram of the cover and well seat orientation.

[0026] Figure 7 This is a schematic diagram of the position of the reinforcement structure of the utility model.

[0027] Figure 8 This is a schematic diagram of the connecting rod installation of the utility model.

[0028] Figure 9 This is a product schematic diagram of the present utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. in a specific working state. If the specific posture changes, the directional indication will also change accordingly. In the present invention, unless otherwise clearly specified and limited, the term "connection" and the like should be understood in a broad sense. For example, "connection" can be an electrical signal connection or a signal connection; it can also be the internal connection between two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] refer to Figures 1 to 5 As shown, one embodiment of the present invention is a stacked manhole cover structure, including a manhole seat 1 and a cover body 2. Considering that the manhole cover structure may involve the load-bearing of automobiles, the entire material is made of ductile iron, cast steel or rolled steel. The upper end of the above-mentioned manhole seat 1 is provided with a mounting port A for placing the cover body 2; the mounting port A is an existing mounting port; as shown in the accompanying drawings, the size of the mounting port A is adapted to the size of the cover body 2. If necessary, the installation of the cover body 2 and the manhole seat 1 can adopt the existing installation method through the mounting port A, such as installing an existing retaining spring between the cover body 2 and the mounting port A to prevent jumping; or a rubber pad can be added to the mounting port A to prevent cars, pedestrians or objects from passing by and making noise. The upper end of the above-mentioned cover body 2 is provided with a water inlet 201, and the inner cavity of the above-mentioned manhole seat 1 is provided with a drainage channel 3. Among them, there are multiple water inlets 201 on the upper end of the cover body 2, and the drainage capacity of the foundation is improved by multiple water inlets 201.

[0033] To reduce the safety risks associated with damage to the cover 2, a first step 101 is provided on the inner wall of the well seat 1. A first partition 4 is mounted on this first step 101, and a first drain port 401 is provided on this first partition 4, communicating with the drainage channel 3. The first partition 4 is positioned close to the cover 2 and maintains a distance from it. The installation of the first partition 4 within the well seat 1 not only provides basic drainage functionality but also adds a physical barrier, providing a buffering effect in the event of damage or falling of the cover 2, preventing or mitigating further fall and objectively reducing the safety risks associated with damage to the cover 2.

[0034] To further reduce noise, a second drain port 102 is provided on the first step 101. This second drain port 102 is used to direct fluid to the well wall at the bottom of the well seat 1. This second drain port 102 guides the liquid into the well wall, allowing it to subsequently flow along the wall. This creates resistance on the wall, slowing the flow and reducing the force of water droplets impacting the well bottom or the water surface. Furthermore, when the amount of liquid is small, drainage through the drain channel 3 can be avoided.

[0035] Exemplarily, the water inlet 201 can surround the cover body 2 and be distributed in a ring matrix on the cover body 2, wherein the water inlet 201 close to the outside of the cover body 2 can be located above the first step 101. When a small amount of liquid flows into the cover body 2, the liquid preferentially falls into the first step 101 through the water inlet 201, and the liquid is discharged through the second drain port 102 on the first step 101, so that a small amount of liquid can flow along the well wall when discharged, so that the speed and flow rate of the liquid flow are controlled to a certain extent, so that when a small amount of liquid is discharged, a buffered drainage method is used to effectively reduce the generation of noise.

[0036] In order to improve the upper limit of the safety load of the cover 2, refer to Figure 1 and Figure 5 As shown, the lower end of the cover 2 is provided with a post 202, the lower end of which contacts the first partition 4. The post 202 is used to transfer the load of the cover 2 to the first partition 4. The gap between the first partition and the post effectively distributes and transfers the load pressure above the cover 2. Even when the cover 2 is subjected to a large load, the structure between the cover 2 and the wellhead 1 can better maintain its stability, preventing damage caused by excessive load. This improves the safe load-bearing capacity of the cover 2.

[0037] Based on the above embodiment, reference Figure 2 、 Figure 5 and Figure 6As shown, another embodiment of the present invention is that, in order to optimize the drainage efficiency, a height difference is set between the upper end of the first step 101 and the upper end of the first partition 4; a drainage area 41 is set on the first partition 4, and the drainage area 41 is located below the water inlet 201. Through the height difference between the first step 101 and the first partition 4, when the amount of liquid delivered by the cover body 2 is large, the liquid will also be input through the water inlet above the drainage area 41, and the liquid will fall into the drainage area 41; a drainage groove 402 is provided on the drainage area 41, and the drainage groove 402 gradually tilts from the inside to the outside of the first partition 4; at this time, the inclined design of the drainage groove 402 helps the liquid to flow quickly to the first step 101, and at this time, the second drain port 102 on the first step and the first drain port 401 on the first partition 4 work at the same time; thereby, the drainage channel 3 starts to work, thereby increasing the drainage efficiency.

[0038] Based on the above embodiment, another embodiment of the present invention is to uniformly transfer the load. Figure 3 and Figure 5 As shown, the first partition 4 is provided with a socket 403 corresponding to the column 202, and the socket 403 is used to resist the column 202; the first partition 4 transfers the load between the socket 403 and the column 202, and the contact area is increased by the concave-convex fit between the socket 403 and the column 202, which is beneficial to avoid structural damage or deformation caused by excessive single-point load on the column 202, and objectively enhances the overall bearing capacity of the cover 2.

[0039] refer to Figure 2 As shown, in order to effectively drain and avoid water accumulation in the socket 403, an isolation area 42 is set on the above-mentioned first partition 4, and the above-mentioned isolation area is placed around the socket 403. The above-mentioned drainage area 41 is located around the isolation area 42; a slope is provided on the above-mentioned isolation area 42, and the slope is inclined from the socket 403 to the drainage area 41.

[0040] The isolation area 42 is designed to prevent liquid from entering the socket 403. The isolation area 42 surrounds the socket 403, and the drainage area 41 surrounds the isolation area 42. This ensures that rainwater or other liquids preferentially flow to the drainage area 41, and indirectly directs the liquid away from the socket 403 area through the distance. The slope of the isolation area 42 allows liquid to naturally flow along the slope toward the drainage area 41, where it is then guided by the concave drainage groove 402. This ensures that there is minimal liquid accumulation around the area where the plug 202 contacts the first partition 4 through the socket 403.

[0041] For reference, considering that the socket 403 is a recessed design, when the liquid flow of the first partition is huge, the risk of liquid accumulation in the socket 403 cannot be completely avoided. Therefore, the side wall or bottom of the socket 403 can be adaptively opened with several small through holes that do not affect load transfer.

[0042] Based on the above embodiment, refer to Figure 2 and Figure 3 As shown, another embodiment of the present invention is that there are multiple drainage grooves 402, with a spacing between two adjacent drainage grooves 402, and the first drainage port 401 is connected to at least one drainage groove 402. By providing multiple drainage grooves, liquid can be discharged in a dispersed manner, avoiding blockage of a single drainage channel due to excessive liquid inflow, which helps to reduce the drainage pressure of a single drainage groove in the event of heavy rain under high flow conditions; even if a drainage groove 402 fails due to blockage by debris, the liquid overflowing from the drainage groove 402 can be diverted by the adjacent drainage groove 402, achieving adaptive regulation of the liquid during the drainage process; thereby reducing the possibility of large amounts of water accumulating on the first partition plate 4.

[0043] Based on the above embodiment, reference Figures 1 to 5 As shown, another embodiment of the present invention is that a positioning ring 5 is provided on the edge of the first step 101 , and the first partition 4 is detachably mounted on the positioning ring 5 ; the bottom of the drainage groove 402 is flush with the upper surface of the positioning ring 5 .

[0044] The positioning ring 5 can be used as a reference to ensure the position accuracy of the first partition plate 4 during installation, ensuring that the first partition plate 4 is correctly placed in the predetermined position, thereby avoiding installation errors.

[0045] Among them, the first partition 4 is designed to be detachable and used in conjunction with the positioning ring 5, which can facilitate maintenance personnel to quickly operate when repairing or replacing the first partition 4, greatly reducing maintenance time and labor intensity.

[0046] Finally, the positioning ring 5 increases the rigidity and stability of the overall structure. When the first partition 4 is accidentally subjected to a heavy load, the load can be effectively transferred to the well seat 2 structure through the positioning ring 5.

[0047] For further reference, Figure 4 As shown, a gap exists between the inner wall of the well seat 1 and the positioning ring 5, forming an overflow channel that connects to the second drain port 102. A second step B is provided on the inner wall of the positioning ring 5. The edge of the first baffle 4 abuts against the second step B, and the upper end of the second step B abuts against the lower end of the first baffle 4. The configuration of the second step B prevents the first baffle 4 from falling while facilitating its vertical removal from the positioning ring 5. When the first baffle 4 is removed from the positioning ring 5 and removed from the mounting opening A, the positioning ring 5 forms a hollow channel, which allows for easy lowering to the well bottom by personnel, facilitating maintenance work on the well facilities.

[0048] For further reference, Figure 3 and Figure 5 As shown, to optimize drainage efficiency, the positioning ring 5 is provided with a third drain port 501, with both ends of the third drain port 501 connecting to the drainage channel 3 and the overflow channel, respectively. When the existing second drain port 102 and first drain port 401 exceed their handling capacity due to high water flow, water may accumulate in their overflow channel. In this case, the third drain port 501 provides an additional drainage path. When the second drain port 102 and first drain port 401 reach their capacity limits, liquid accumulated in the second drain port 102 can be discharged into the drainage channel 3 through the third drain port 501, reducing the problem of water accumulation in the overflow channel.

[0049] In a preferred embodiment, the positioning ring 5 includes multiple third drain openings 501, with the spacing between adjacent third drain openings 501 being the same. By providing multiple third drain openings 501, even if a single third drain opening 501 is overwhelmed or clogged by excessive water flow, the other third drain openings 501 can still function normally, ensuring overall drainage efficiency. Multiple third drain openings 501 with the same spacing ensure balanced drainage efficiency around the entire positioning ring, objectively dispersing drainage pressure and reducing the risk of water accumulation in certain areas due to poor drainage.

[0050] Based on the above embodiment, reference Figures 5 to 9 As shown, another embodiment of the present invention is that, considering that the first baffle 4 is located in the drainage channel 3 and has a large amount of overhanging area, while the first baffle 4 is designed to increase the safety of the manhole cover structure and reduce the risk of damage, when the cover 2 is damaged, the first baffle 4 needs to have sufficient strength and stability to support the load above it. Therefore, a reinforcement structure 6 is provided in the drainage channel 3, the upper end of which is used to contact the first baffle 4; the side wall of the reinforcement structure 6 is provided with a connecting rod 7, the end of which is mounted on the inner wall of the drainage channel 3. By contacting the first baffle 4, the reinforcement structure 6 ensures that if the cover 2 is damaged and the first baffle 4 bears the heavy load, the load of the first baffle 4 can be transferred to the inner wall of the drainage channel 3 through the reinforcement structure 6, thereby preventing further damage or accidents caused by the damage to the first baffle 4. The connecting rod 7 is used to more evenly distribute the load of the reinforcement structure 6 to the inner wall of the drainage channel 3, reducing single-point loads and avoiding local overloads that may cause structural damage.

[0051] Furthermore, the reinforcement structure 6 includes an anti-fall plate 601 and a column 602. The column 602 is vertically mounted on the anti-fall plate 601; the upper end of the column 602 is configured to contact the lower end of the first partition 4. The column 602 is vertically mounted on the anti-fall plate 601 and its upper end contacts the first partition 4, providing direct support for the first partition. In the event of damage to the cover 2, the column 602 stably bears the load from above, thereby protecting the first partition from damage or deformation due to excessive load.

[0052] The connecting rods 7 are fixed to the sidewalls of the anti-fall plate 601. There are at least three connecting rods 7, distributed around the central axis of the anti-fall plate 601. By being fixed to the sidewalls of the anti-fall plate 601 and distributed around the central axis of the anti-fall plate, these connecting rods help to more evenly distribute the load transmitted from the first partition 4 to the inner wall of the drainage channel 3, thereby reducing the risk of local overload of the anti-fall plate 601.

[0053] Furthermore, the inner wall of the drainage channel 3 is provided with a protrusion 8 corresponding to the connecting rod 7, and the side wall of the protrusion 8 is provided with a groove 801 for the connecting rod 7 to be inserted. The lower end of the connecting rod 7 is used to abut the bottom of the groove 801, and the protrusion 8 supports the anti-fall plate 601 through the connecting rod 7.

[0054] The design of the protrusion 8 and the groove 801 allows the connecting rod 7 to be precisely positioned and inserted into the inner wall of the drainage channel 3. Furthermore, the anti-fall plate 601 transfers its load to the protrusion 8 via the connecting rod 7, primarily relying on the interference between the connecting rod 7 and the groove 801. When maintenance is required on the shaft, the connecting rod 7 applies a vertical tension, releasing the constraint of the groove 801 on the reinforcement structure 6, allowing it to be removed from the mounting opening A. This ensures that the drainage channel 3 does not hinder workers descending the shaft.

[0055] References in this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," and the like refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of the present invention.

[0056] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, various variations and modifications may be made to the components and / or layout of the subject combination arrangement. In addition to variations and modifications to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A stacked manhole cover structure, comprising a manhole base (1) and a cover body (2), wherein the upper end of the manhole base (1) is provided with a mounting opening for placing the cover body (2); the upper end of the cover body (2) is provided with a water inlet (201), and the inner cavity of the manhole base (1) is provided with a drainage channel (3), characterized in that: The inner wall of the well seat (1) is provided with a first step (101), a first partition (4) is provided on the first step (101), and a first drainage port (401) communicating with the drainage channel (3) is provided on the first partition (4); Wherein, the first partition (4) is used to be close to the cover body (2) and maintain a distance from the cover body (2); Wherein, a second drainage port (102) is provided on the first step (101); the second drainage port (102) is used to drain the fluid to the well wall at the bottom of the well seat (1); The lower end of the cover body (2) is provided with an insertion column (202), the lower end of the insertion column (202) abuts against the first partition (4), and the insertion column (202) is used to transfer the load of the cover body (2) to the first partition (4).

2. The stacked manhole cover structure according to claim 1, characterized in that: A height difference is set between the upper end of the first step (101) and the upper end of the first partition (4); a drainage area (41) is set on the first partition (4), and the drainage area (41) is located below the water inlet (201); a drainage groove (402) is provided on the drainage area (41), and the drainage groove (402) gradually slopes from the inner side of the first partition (4) to the outer side.

3. The stacked manhole cover structure according to claim 2, characterized in that: The first partition (4) is provided with a socket (403) corresponding to the plug post (202), and the socket (403) is used to contact the plug post (202); an isolation area (42) is provided on the first partition (4), and the isolation area is placed around the socket (403), and the drainage area (41) is located around the isolation area (42); a slope is provided on the isolation area (42), and the slope is inclined from the socket (403) to the drainage area (41).

4. The stacked manhole cover structure according to claim 2, characterized in that: There are multiple drainage grooves (402), and there is a distance between two adjacent drainage grooves (402). The first drainage port (401) is connected to at least one drainage groove (402).

5. The stacked manhole cover structure according to claim 2, characterized in that: A positioning ring (5) is provided on the edge of the first step (101), and the first partition (4) is detachably mounted on the positioning ring (5); the bottom of the drainage groove (402) is flush with the upper surface of the positioning ring (5).

6. The stacked manhole cover structure according to claim 5, characterized in that: There is a gap between the inner wall of the well seat (1) and the positioning ring (5), and the gap forms an overflow channel, and the overflow channel is connected to the second drain port (102). The inner wall of the positioning ring (5) is provided with a second step, and the edge of the first partition (4) is in contact with the second step, and the upper end of the second step abuts against the lower end of the first partition (4).

7. The stacked manhole cover structure according to claim 6, characterized in that: The positioning ring (5) is provided with a third drain port (501), and both ends of the third drain port (501) are connected to the drain channel (3) and the overflow channel respectively; There are multiple third drain openings (501) on the positioning ring (5), and the gaps between two adjacent third drain openings (501) are the same.

8. The stacked manhole cover structure according to claim 1, characterized in that: A reinforcement structure (6) is provided in the drainage channel (3), the upper end of the reinforcement structure (6) being used to contact the first partition (4); a connecting rod (7) is provided on the side wall of the reinforcement structure (6), the end of the connecting rod (7) being mounted on the inner wall of the drainage channel (3).

9. The stacked manhole cover structure according to claim 8, characterized in that: The reinforcement structure (6) comprises an anti-falling plate (601) and a column (602), wherein the column (602) is vertically mounted on the anti-falling plate (601); the upper end of the column (602) is used to abut against the lower end of the first partition (4); The connecting rods (7) are fixed to the side wall of the anti-fall plate (601), there are at least three connecting rods (7), and the connecting rods (7) are distributed around the central axis of the anti-fall plate (601).

10. The stacked manhole cover structure according to claim 9, characterized in that: The inner wall of the drainage channel (3) is provided with a protrusion (8) corresponding to the connecting rod (7); the side wall of the protrusion (8) is provided with a groove (801) for the connecting rod (7) to be inserted; the lower end of the connecting rod (7) is used to abut against the bottom of the groove (801); the protrusion (8) supports the anti-fall plate (601) through the connecting rod (7).

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