Dual-opening manhole cover

Abstract

The utility model discloses a kind of double-opening well lid, double-opening well lid includes well pedestal, is equipped with the opening with well mouth intercommunication;Well lid assembly has opening state and closed state, when closed state, well lid assembly covers is equipped at opening, when opening state, well lid assembly at least partly opens opening;Wherein, well lid assembly includes at least first well lid and second well lid, first well lid and second well lid are movably connected in the two sides of well pedestal respectively;Limiting piece, limiting piece is connected in well pedestal and well lid assembly respectively, when first well lid and second well lid open to preset angle, limiting piece and first well lid and second well lid limit cooperation.The utility model scheme aims at improving safety, stability and being convenient for maintenance.

Description

Technical Field

[0001] This utility model relates to the field of municipal engineering devices, and in particular to a double-opening manhole cover. Background Technology

[0002] Traditional single manhole covers are typically heavy, requiring significant manual or mechanical assistance to open and close, especially without specialized tools, making them very inconvenient to operate. In narrow streets or areas with obstacles, opening a large single manhole cover may be limited by the surrounding environment, making it difficult to completely remove the cover for maintenance work. Utility Model Content

[0003] The main purpose of this utility model is to propose a double-opening manhole cover, which aims to improve safety, stability and ease of maintenance.

[0004] To achieve the above objectives, this utility model proposes a double-opening manhole cover, comprising:

[0005] The well base has an opening that connects to the wellhead;

[0006] A manhole cover assembly has an open state and a closed state. In the closed state, the manhole cover assembly covers the opening. In the open state, the manhole cover assembly at least partially opens the opening.

[0007] The manhole cover assembly includes at least a first manhole cover and a second manhole cover, which are movably connected to both sides of the manhole base, respectively.

[0008] The limiting component is connected to the manhole base and the manhole cover assembly respectively. When the first manhole cover and the second manhole cover are opened to a preset angle, the limiting component cooperates with the first manhole cover and the second manhole cover to limit their movement.

[0009] In one embodiment, the limiting member has a limiting surface and a sidewall structure for contacting the manhole cover assembly. The limiting surface and the sidewall structure are connected, and the sidewall structure is connected to the manhole seat. When the manhole cover assembly is opened to a preset angle, the limiting surface engages with the manhole cover assembly for limiting.

[0010] In one embodiment, the sidewall structure has a first sidewall and a second sidewall, the first sidewall, the second sidewall and the limiting surface are connected in sequence, the limiting surface is inclined relative to the well seat, and the inclination angle of the limiting surface is configured to limit the fit between the well cover assembly and the limiting surface.

[0011] In one embodiment, there are at least two limiting members, and the two limiting members are respectively connected to the manhole base and the first manhole cover, as well as the manhole base and the second manhole cover.

[0012] In one embodiment, the two limiting members respectively limit the maximum opening angle of the first manhole cover and the second manhole cover to 80° to 85°.

[0013] In one embodiment, the double-opening manhole cover further includes a hinge structure, the hinge structure including a first hinge and a second hinge, the first hinge and the second hinge being respectively disposed on the outer side of the manhole cover assembly and the manhole seat, the first manhole cover being movably connected to the first hinge, and the second manhole cover being movably connected to the second hinge.

[0014] In one embodiment, the manhole cover includes a first base and a second base, the first base being disposed on the second base, the inner diameter of the first base being smaller than the inner diameter of the second base, both the first base and the second base having the opening, and the first hinge and the second hinge being respectively connected to the outer side of the manhole cover assembly and the second base.

[0015] In one embodiment, the double-opening manhole cover further includes a support structure disposed at the opening, which supports the first manhole cover and the second manhole cover when closed.

[0016] In one embodiment, the support structure is a support platform that extends along the inside of the opening on the well base.

[0017] In one embodiment, the first manhole cover and the second manhole cover are each provided with at least one through hole, and the through hole communicates with the opening.

[0018] In one embodiment, the first cover and the second cover are semi-circular.

[0019] This utility model discloses a double-opening manhole cover, which includes a manhole base, a manhole cover assembly, and a limiting member. The manhole base has an opening communicating with the manhole opening; the manhole cover assembly has an open state and a closed state. In the closed state, it covers the opening, while in the open state, it at least partially opens the opening. The manhole cover assembly includes at least a first manhole cover and a second manhole cover, which are movably connected to both sides of the manhole base, allowing the manhole covers to be opened from both sides. The limiting member is connected to the manhole base and the manhole cover assembly, and is used to limit the opening of the first and second manhole covers when they are opened to a preset angle, thereby ensuring the stability and safety of the manhole cover in the open state, as well as facilitating opening and routine inspection and maintenance. This structure is reasonably designed, easy to operate, and suitable for occasions requiring frequent opening of manhole covers, improving both convenience and safety. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the double-opening manhole cover provided by this utility model;

[0022] Figure 2 for Figure 1 A magnified view of a portion of the diagram;

[0023] Figure 3 A schematic diagram of a well seat embodiment provided by this utility model;

[0024] Figure 4 This is a schematic diagram of another embodiment of the double-opening manhole cover provided by this utility model.

[0025] Explanation of icon numbers:

[0026] 10. Manhole base; 11. Opening; 12. First base; 13. Second base; 20. Manhole cover assembly; 21. First manhole cover; 22. Second manhole cover; 23. Through hole; 30. Limiting component; 31. Limiting surface; 32. Side wall structure; 33. First side wall; 34. Second side wall; 40. Hinge structure; 41. First hinge; 42. Second hinge.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] This utility model proposes a double-opening manhole cover.

[0032] Reference Figures 1 to 4 In this embodiment of the utility model, a double-opening manhole cover includes:

[0033] The well base 10 has an opening 11 that communicates with the wellhead;

[0034] The manhole cover assembly 20 has an open state and a closed state. In the closed state, the manhole cover assembly 20 covers the opening 11. In the open state, the manhole cover assembly 20 at least partially opens the opening 11.

[0035] The manhole cover assembly 20 includes at least a first manhole cover 21 and a second manhole cover 22, wherein the first manhole cover 21 and the second manhole cover 22 are movably connected to both sides of the manhole base 10.

[0036] The limiting member 30 is connected to the manhole base 10 and the manhole cover assembly 20 respectively. When the first manhole cover 21 and the second manhole cover 22 are opened to a preset angle, the limiting member 30 is engaged with the first manhole cover 21 and the second manhole cover 22 to limit their movement.

[0037] This utility model discloses a double-opening manhole cover structure, belonging to the technical field of municipal facilities or underground manhole equipment. It is mainly used to cover and open manholes to facilitate the maintenance, inspection, or operation of underground facilities. Its core objective is to provide a manhole cover device with a reasonable structure, convenient operation, and high safety, suitable for various underground facilities such as roads, drainage systems, power wells, and communication wells. The entire manhole cover device consists of three main parts: a manhole base 10, a manhole cover assembly 20, and a limiting member 30. First, the manhole base 10 is the basic support part of the entire manhole cover structure, usually fixedly installed above the manhole opening, and has an opening 11 communicating with the manhole opening inside. The function of this opening 11 is to allow personnel or equipment to enter and exit the manhole. When the manhole cover assembly 20 is in the closed state, it completely covers this opening to ensure the safety of ground passage and the sealing of the manhole opening. Second, the manhole cover assembly 20 is the part used to open and close the opening 11, and has two basic states: a closed state and an open state. In the closed state, the manhole cover assembly 20 tightly covers the opening 11, providing sealing and protection. In the open state, the manhole cover assembly 20 at least partially opens the opening 11 to facilitate underground operations. Unlike traditional one-piece manhole covers, this manhole cover assembly 20 adopts a double-opening structure, comprising a first manhole cover 21 and a second manhole cover 22, which are movably connected to both sides (e.g., the left and right sides) of the manhole base 10, allowing for independent opening and closing operations. This design enables the manhole opening to be opened from both sides, making operation more flexible, especially suitable for situations with limited space or requiring rapid opening. It also improves the stability of the manhole cover in the open state, avoiding uneven force distribution when opening from one side. To further enhance the safety and controllability of the manhole cover, a limiting member 30 is also provided in the structure. One end of the limiting member 30 is connected to the manhole base 10, and the other end is connected to the manhole cover assembly 20, specifically, to the first manhole cover 21 and the second manhole cover 22. When the manhole cover is opened to a certain angle, the limiting component 30 engages with the cover to prevent it from opening further, thus preventing the cover from tipping over or shaking due to excessive opening. This limiting design not only improves the stability of the manhole cover in the open state but also effectively prevents safety hazards caused by wind or other external forces, increasing the safety factor during operation. This double-opening manhole cover divides the cover into two independently openable parts and incorporates the limiting component 30 in its structure. By limiting the opening angle of the cover, the limiting component 30 effectively prevents accidents. In this manhole cover structure, the limiting component 30 is a component connecting the manhole base 10 and the manhole cover assembly 20.It can take one of the following forms, but is not limited to: a linkage structure, which is a single or group of metal rods, one end of which is fixed to the well base and the other end is connected to the well cover; or a telescopic rod or hinge structure, which is a support rod with a movable joint that allows a certain range of movement; or a limit block or stop block, which is a fixed block installed on the well cover or well base that prevents the well cover from opening further when it is opened to a certain angle; or an elastic limit device, which has a spring or buffer structure that can provide buffer protection while limiting the movement.

[0038] Reference Figures 1 to 4 In this embodiment of the present invention, the limiting member 30 has a limiting surface 31 and a side wall structure 32 for contacting the manhole cover assembly 20. The limiting surface 31 and the side wall structure 32 are connected, and the side wall structure 32 is connected to the manhole seat 10. When the manhole cover assembly 20 is opened to a preset angle, the limiting surface 31 is limited and engaged with the manhole cover assembly 20.

[0039] By providing a limiting surface 31 and a sidewall structure 32 on the limiting member 30, and ensuring that the limiting surface 31 engages with the manhole cover assembly 20 when opened to a preset angle, precise control and stable support of the manhole cover opening angle are achieved, improving the safety and ease of operation during manhole cover use. The limiting member 30 has a limiting surface 31 for contacting the manhole cover assembly 20, indicating that the limiting member 30 has a specific contact surface. When the manhole cover assembly 20 is opened to a preset angle, this limiting surface 31 contacts the manhole cover assembly 20 (usually the edge or support structure of the first manhole cover 21 and the second manhole cover 22) and forms a limiting effect. This limiting engagement effectively prevents the manhole cover from continuing to rotate, preventing it from tipping over or detaching from the manhole seat 10 due to an excessively large opening angle, thus ensuring the stability of the manhole cover in the open state. The connection between the limiting surface 31 and the side wall structure 32 indicates that the overall structure of the limiting member 30 includes a plane with a limiting function (limiting surface 31) and a structural part for supporting and fixing the limiting surface (side wall structure 32). The side wall structure 32 not only serves a connecting function but also enhances the structural strength and stability of the limiting member 30, making it less prone to deformation or damage when subjected to external forces during manhole cover opening. The side wall structure 32 is connected to the manhole base 10, indicating that one end of the limiting member 30 is fixed to the manhole base 10 via the side wall structure 32, and the other end engages with the manhole cover assembly 20 via the limiting surface 31. This design makes the limiting member 30 a bridge between the manhole base 10 and the manhole cover assembly 20, capable of sensing changes in the manhole cover opening angle and providing timely limiting support, thereby achieving dynamic control of the manhole cover opening process. When the manhole cover assembly 20 is opened to a preset angle, the limiting surface 31 engages with the manhole cover assembly 20, meaning that the limiting component 30 has entered the limiting state, and the manhole cover cannot be opened further, thus being restricted to a safe and controllable angle range. This limiting process can be achieved through direct physical contact limiting, or through the engagement of the limiting surface 31 with limiting protrusions, limiting edges, or other structures on the manhole cover assembly 20. This solution achieves precise control and effective limiting of the manhole cover opening angle by setting a limiting surface 31 and a sidewall structure 32 on the limiting component 30, and ensuring that the limiting surface 31 engages with the manhole cover assembly 20 when opened to a preset angle.

[0040] Reference Figures 1 to 4 In this embodiment of the present invention, the sidewall structure 32 has a first sidewall 33 and a second sidewall 34, the first sidewall 33, the second sidewall 34 and the limiting surface 31 are connected in sequence, the limiting surface 31 is inclined relative to the well seat 10, and the inclination angle of the limiting surface 31 is configured to make the well cover assembly 20 limit the engagement with the limiting surface 31.

[0041] By setting a structure in which a first sidewall 33, a second sidewall 34, and a limiting surface 31 are sequentially connected in the limiting component 30, and by setting the limiting surface 31 at an inclination relative to the manhole base 10, the manhole cover assembly 20 can form a stable limiting engagement with the limiting surface 31 when opened to a preset angle, thereby further improving the safety and structural stability during the opening process of the manhole cover. Specifically, the sidewall structure 32 includes a first sidewall 33 and a second sidewall 34, which are sequentially connected to the limiting surface 31 to form an integral structure. This design not only enhances the overall structural strength of the limiting component 30, enabling it to remain stable under the external force when the manhole cover is opened, but also provides a solid support foundation for the limiting surface 31, ensuring that it will not shift or fail during the limiting process. The fact that the limiting surface 31 is inclined relative to the manhole base 10 indicates that the limiting surface is not arranged horizontally or vertically, but is designed with a certain inclination angle according to the opening trajectory and structural requirements of the manhole cover. The design of this tilt angle is not arbitrary, but determined after structural mechanics and motion trajectory analysis. Its purpose is to allow the manhole cover assembly 20 to naturally contact the limiting surface 31 and form a limiting engagement during opening. The tilt angle of the limiting surface 31 is configured to match the opening trajectory of the manhole cover assembly 20, ensuring that when the manhole cover is opened to a certain preset angle, the edge or limiting structure of the manhole cover contacts the limiting surface 31 and is blocked by it, thus stopping further opening. This limiting engagement can be achieved through direct contact or through structures such as limiting protrusions or limiting edges.

[0042] Reference Figures 1 to 4 In this embodiment of the utility model, there are at least two limiting members 30, and the two limiting members 30 are respectively connected to the well base 10 and the first well cover 21, as well as the well base 10 and the second well cover 22.

[0043] Specifically, there are at least two limiting members 30, meaning one limiting member 30 is provided on each side of the manhole cover assembly 20 (i.e., the first manhole cover 21 and the second manhole cover 22). One end of each limiting member 30 is connected to the manhole base 10, and the other end is connected to the corresponding manhole cover (the first manhole cover 21 or the second manhole cover 22). This symmetrical or independently arranged structure allows the two manhole covers to be independently limited and controlled during opening, without interfering with each other, thus achieving more precise angle control and a more reliable limiting effect. When the operator opens only the first manhole cover 21, the corresponding limiting member 30 will activate when it is opened to a preset angle, preventing the manhole cover on that side from continuing to open or tipping over; while the second manhole cover 22 and its corresponding limiting member 30 remain stationary and do not affect the current operation. Similarly, if only the second manhole cover 22 is opened, the corresponding limiting member 30 will also limit it when it is opened to a set angle. If it is necessary to open both manhole covers simultaneously, the two limiting members 30 will limit the manhole covers on both sides respectively, ensuring the stability and safety of the overall structure. This design not only enables independent opening and limiting of both sides of the manhole cover assembly 20, but also allows for flexible control of the manhole opening range according to actual operational needs, making it suitable for different operating scenarios, such as rapid single-side maintenance and full double-side opening for maintenance. When it is necessary to replace or repair the limiting component, a single limiting component can be disassembled or replaced without affecting the overall structure of the manhole cover. This modular and independent connection method allows maintenance personnel to quickly locate and replace faulty components, avoiding the need to replace the entire manhole cover system due to the failure of a single component, thereby significantly reducing maintenance costs.

[0044] Reference Figures 1 to 4 In this embodiment of the present invention, the two limiting members 30 respectively limit the maximum opening angle of the first manhole cover 21 and the second manhole cover 22 to 80° to 85°.

[0045] Specifically, the two limiting members 30 are respectively connected between the manhole base 10 and the first manhole cover 21, and between the manhole base 10 and the second manhole cover 22. When the manhole cover assembly 20 is opened, the limiting members 30 will move relative to the manhole cover as it rotates. When the first manhole cover 21 or the second manhole cover 22 rotates to a preset angle range of 80° to 85°, the limiting surface of the limiting member 30 or other limiting structures will contact or cooperate with the manhole cover, preventing it from continuing to rotate, thereby achieving physical limitation on the opening angle of the manhole cover. This angle range has the following advantages: high safety, which can prevent the manhole cover from tipping over or detaching due to an excessively large opening angle, thus preventing accidents; the opening angle of 80° to 85° is sufficient for operators to conveniently carry out underground operations without occupying too much ground space; within this angle range, the center of gravity of the manhole cover can still be kept within the manhole base range, reducing instability caused by the shift of the center of gravity; this angle range facilitates the structural arrangement and installation of the limiting member 30, enabling it to achieve the best limiting effect within a reasonable force range.

[0046] Reference Figures 1 to 4 In this embodiment of the present invention, the double-opening manhole cover further includes a hinge structure 40, which includes a first hinge 41 and a second hinge 42. The first hinge 41 and the second hinge 42 are respectively disposed on the outer side of the manhole cover assembly 20 and the manhole seat 10. The first manhole cover 21 is connected to the first hinge 41, and the second manhole cover 22 is movably connected to the second hinge 42.

[0047] Specifically, the hinge structure 40 includes a first hinge 41 and a second hinge 42. These two hinges are respectively located on the outer side of the connection between the manhole cover assembly 20 and the manhole seat 10, that is, at the edge of the connection between the manhole cover and the manhole seat, rather than in the center or in a hidden structure. This arrangement facilitates installation, maintenance, and observation, and also makes the force on the manhole cover more even during opening, reducing the risk of structural deformation or jamming. The first manhole cover 21 is connected to the first hinge 41, indicating that the first manhole cover 21 forms a rotatable connection with the manhole seat 10 through the first hinge 41, and can open and close under the action of the hinge. The second manhole cover 22 is movably connected to the second hinge 42, indicating that the second manhole cover 22 also forms a rotatable connection with the manhole seat 10 through the second hinge 42, and also has the function of opening and closing. Since the first manhole cover 21 and the second manhole cover 22 are connected to the manhole seat 10 through independent hinge structures (first hinge 41 and second hinge 42), the two manhole covers can be opened and closed independently without interfering with each other. This dual-hinge independent connection method not only improves the flexibility of manhole cover operation but also allows the manhole opening to be selectively opened partially or completely according to actual operational needs, enhancing ease of use. This dual-opening independent structure eliminates the need to completely disassemble the entire manhole cover assembly during maintenance or replacement; only the individual manhole cover requiring maintenance or replacement (such as the first manhole cover 21 or the second manhole cover 22) needs to be operated on, significantly reducing maintenance difficulty and workload. Secondly, the hinge structure 40 is arranged on the outside, with the first hinge 41 and the second hinge 42 positioned on the outside of the manhole cover assembly 20 and the manhole seat 10. This design not only enhances the stability of the manhole cover opening but also makes the hinge structure easier to observe, clean, and maintain. Compared to traditional concealed or built-in hinges, external hinges facilitate daily inspection and lubrication, preventing the manhole cover from failing to open or close properly due to hinge jamming or corrosion. Furthermore, as a key connecting component between the manhole cover and the manhole seat, the design and manufacturing quality of the hinge structure 40 directly affects the service life and operational performance of the manhole cover. Therefore, hinge structures are usually made of high-strength metal materials (such as stainless steel, cast iron, etc.) and are treated with rust and corrosion prevention to adapt to long-term use in complex outdoor environments.

[0048] Reference Figures 1 to 4In this embodiment of the present invention, the well base 10 includes a first base 12 and a second base 13. The first base 12 is disposed on the second base 13. The inner diameter of the first base 12 is smaller than the inner diameter of the second base 13. The first base 12 and the second base 13 are both provided with the opening 11. The first hinge 41 and the second hinge 42 are respectively connected to the outer side of the well cover assembly 20 and the second base 13.

[0049] Specifically, the well base 10 includes a first base 12 and a second base 13, wherein the first base 12 is disposed on top of the second base 13, forming a stacked or nested structure. This double-layer base design has a clear functional division: the second base 13 serves as the basic support, directly and fixedly connected to the wellhead or ground structure, bearing the main load-bearing function; the first base 12 is located above it, serving as a transition, limiting, and sealing mechanism. The inner diameter of the first base 12 is smaller than the inner diameter of the second base 13, meaning that the internal channel of the first base 12 is narrower than that of the second base 13, thus forming a stepped transition structure between the two. This design serves multiple purposes: First, the stepped structure acts as a support or limiting surface when the manhole cover assembly 20 is closed, ensuring precise positioning of the cover in the closed state and improving closure stability and sealing. Second, this structure helps guide water or debris towards the center of the manhole opening, reducing the risk of water accumulation or blockage. More importantly, the different inner diameters provide space for the installation of seals between the manhole cover and the manhole base. For example, a sealing groove can be provided on the inner edge of the first base 12 for installing a rubber sealing ring, thereby achieving an effective seal between the manhole cover and the manhole base and preventing rainwater, dust, or foreign objects from entering the manhole. Both the first base 12 and the second base 13 have openings 11, indicating that the upper and lower parts of the entire manhole base maintain a passageway connecting to the manhole opening, ensuring smooth entry and exit for personnel or equipment. Simultaneously, this through-type design also ensures the normal operation of ventilation and drainage functions within the manhole. Furthermore, the first hinge 41 and the second hinge 42 are respectively connected to the outer sides of the manhole cover assembly 20 and the second base 13, indicating that the hinge structure is not installed on the first base 12, but is directly fixed to the second base 13, which has a more stable structure and stronger load-bearing capacity. This arrangement has significant advantages: on the one hand, the second base 13 is usually larger, thicker, and buried deeper, providing a more solid connection foundation and preventing the manhole cover from failing due to loosening or falling off of the hinge; on the other hand, placing the hinge on the outer side of the second base 13 facilitates installation, debugging, and subsequent maintenance. Maintenance personnel can inspect, lubricate, or replace the hinge without disassembling the first base 12, greatly improving the maintainability of the manhole cover system. The first base 12 is made of 30×30×3 thick square tubing, with a cross-sectional size of 30mm×30mm and a wall thickness of 3mm. It is processed into shape through cutting, welding, grinding, and other processes, and then bent or spliced ​​according to the size of the manhole opening and the shape of the manhole cover assembly (such as a semi-circle) to finally form a support structure surrounding the manhole opening. In addition, reinforcing ribs are provided between the first base 12 and the second base 13 to improve the overall structural strength and compressive strength of the well base and prevent deformation or damage under the action of vehicles or heavy objects.

[0050] Reference Figures 1 to 4In this embodiment of the utility model, the double-opening manhole cover also includes a support structure disposed at the opening 11. When closed, the support structure supports the first manhole cover 21 and the second manhole cover 22.

[0051] Specifically, the support structure is located at the opening 11 of the manhole seat 10, that is, below or around the area covered by the manhole cover assembly 20 when closed. Its main function is to provide additional support for the manhole cover when it is closed, making it less prone to bending, sinking, or deformation when subjected to external pressure (such as vehicle running over it or pedestrian trampling). In the closed state, the support structure supports the first manhole cover 21 and the second manhole cover 22, meaning that when the manhole cover is fully closed, the support structure will contact the bottom or edge of the manhole cover, forming a support platform or support point. This support can effectively distribute the pressure on the manhole cover, preventing damage due to excessive local stress, and also helps maintain the flatness and stability of the manhole cover when closed. The support structure includes, but is not limited to, a ring support platform: a ring support platform is set around the opening 11 to provide uniform support for the entire manhole cover assembly; segmented support beams: multiple support beams are set along the edge of the opening 11 to support the first manhole cover 21 and the second manhole cover 22 respectively; and adjustable support blocks: a support structure with adjustment function that can be finely adjusted according to the thickness of the manhole cover or installation error to ensure the support effect.

[0052] Reference Figures 1 to 4 In this embodiment of the present invention, the support structure is a support platform that extends along the inner side of the opening 11 on the well base 10.

[0053] Specifically, the support structure is a support platform extending along the inner edge of the opening 11 of the manhole base 10. This support platform can be annular or partially annular, and is fixedly installed inside the manhole base 10, located at the edge of the opening 11. When the first manhole cover 21 and the second manhole cover 22 are closed, their bottoms or edges contact the support platform, providing a uniformly distributed load-bearing platform to prevent the manhole cover from sinking, deforming, or being damaged due to excessive localized stress. The support platform provides additional support points for the manhole cover, especially at the edges outside the central area, helping to evenly distribute external pressure (such as vehicle pressure or pedestrian trampling) throughout the entire manhole cover structure, avoiding localized stress concentration, thereby improving the load-bearing capacity and structural strength of the manhole cover. Because the support platform is located directly below the manhole cover when closed, it effectively prevents slight shaking or tilting of the manhole cover in the closed state, ensuring a tighter fit between the manhole cover and the manhole base, and improving the overall structural stability. The presence of the support platform helps the manhole cover land more smoothly when closed, allowing the seals (such as rubber sealing rings) between the manhole cover and the manhole seat to function better, thereby improving the sealing effect and preventing rainwater, sewage, dust, and other foreign objects from entering the manhole, protecting the operational safety of underground facilities. This support platform structure is part of the manhole seat 10 and can be integrally formed with the manhole seat or fixed by welding, bolts, etc., making installation simple, structurally stable, and requiring less frequent adjustment or replacement during later maintenance, thus improving the maintainability and service life of the manhole cover system. The support structure can be set on both sides inside the manhole seat opening, that is, support structures are only set at corresponding positions of the first manhole cover 21 and the second manhole cover 22. The support structure can also be set along the entire edge inside the manhole seat opening, that is, in the form of a ring or continuous support platform. This method can provide more uniform and comprehensive support for the manhole cover, suitable for occasions with higher requirements for load-bearing capacity, sealing performance, and structural stability. For example...

[0054] Reference Figures 1 to 4 In this embodiment of the present invention, the first manhole cover 21 and the second manhole cover 22 are respectively provided with at least one through hole 23, and the through hole 23 is connected to the opening 11.

[0055] Specifically, the first manhole cover 21 and the second manhole cover 22 are each provided with at least one through hole 23. These through holes are typically circular, elliptical, or polygonal in shape, penetrating the manhole cover body. Their position and number are rationally arranged according to the size of the manhole cover, the usage environment, and functional requirements. When the manhole cover is closed, the position of the through hole 23 is connected to the opening 11 on the manhole base 10, thus forming a channel from the top of the manhole cover to the inside of the manhole. The through hole 23 allows air circulation between the inside of the manhole and the outside, helping to expel harmful gases (such as methane, hydrogen sulfide, etc.) from the manhole, improving the underground working environment, and ensuring the safety of maintenance personnel. It is especially suitable for underground facilities such as sewage treatment wells, drainage wells, and septic tank wells where harmful gases may exist. In rainy weather or when there is a lot of water accumulation around the manhole, the through hole 23 can play a certain role in drainage and diversion when the manhole cover is not fully opened, guiding some surface water into the manhole, reducing surface water accumulation, and improving road traffic safety. The through hole 23 can also be used as an operating hole, for example, by inserting tools such as pry bars or hooks to assist in opening the manhole cover. The through hole 23 can also be used in conjunction with the sealing structure of the manhole cover. For example, an openable sealing cover can be installed at the through hole to retain the ventilation or drainage function, and to close the manhole when needed, thereby enhancing the multi-functional adaptability of the manhole cover.

[0056] Reference Figures 1 to 4 In this embodiment of the present invention, the first cover 21 and the second cover 22 are semi-circular.

[0057] Because both covers are semi-circular and symmetrical, the force is evenly distributed during opening, making operation easier and especially suitable for manholes requiring frequent opening or in spaces with limited space. Operators can choose to open one or both covers as needed, offering greater flexibility. The semi-circular structure distributes external pressure (such as from vehicles or pedestrians) evenly, preventing stress concentration and improving the overall load-bearing capacity and service life of the manhole cover, making it particularly suitable for areas with high traffic or heavy loads. The semi-circular cover structure is simple, easy to cast or stamp, and has a mature manufacturing process. Furthermore, its relatively small size and light weight make it easier to handle, install, and maintain compared to a single circular manhole cover. Since the two semi-circular covers are connected to hinge structures on both sides of the manhole base, the semi-circular shape helps ensure the symmetry of the hinge arrangement and the matching of the limiting structure, allowing for more precise control of the opening angle and improving the safety and stability of the manhole cover.

[0058] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A double-opening manhole cover, characterized in that, include: The well base has an opening that connects to the wellhead; A manhole cover assembly has an open state and a closed state. In the closed state, the manhole cover assembly covers the opening. In the open state, the manhole cover assembly at least partially opens the opening. The manhole cover assembly includes at least a first manhole cover and a second manhole cover, which are movably connected to both sides of the manhole base, respectively. The limiting component is connected to the manhole base and the manhole cover assembly respectively. When the first manhole cover and the second manhole cover are opened to a preset angle, the limiting component cooperates with the first manhole cover and the second manhole cover to limit their movement.

2. The double-opening manhole cover according to claim 1, characterized in that, The limiting member has a limiting surface and a side wall structure for contacting the manhole cover assembly. The limiting surface and the side wall structure are connected, and the side wall structure is connected to the manhole seat. When the manhole cover assembly is opened to a preset angle, the limiting surface engages with the manhole cover assembly for limiting.

3. The double-opening manhole cover according to claim 2, characterized in that, The sidewall structure has a first sidewall and a second sidewall, the first sidewall, the second sidewall and the limiting surface are connected in sequence, the limiting surface is inclined relative to the well seat, and the inclination angle of the limiting surface is configured to make the well cover assembly limit and cooperate with the limiting surface.

4. The double-opening manhole cover according to claim 2, characterized in that, There are at least two limiting members, and the two limiting members are respectively connected to the well base and the first well cover, as well as the well base and the second well cover.

5. The double-opening manhole cover according to claim 4, characterized in that, The two limiting components respectively limit the maximum opening angle of the first manhole cover and the second manhole cover to 80° to 85°.

6. The double-opening manhole cover according to claim 1, characterized in that, The double-opening manhole cover also includes a hinge structure, which includes a first hinge and a second hinge. The first hinge and the second hinge are respectively located on the outside of the manhole cover assembly and the manhole seat. The first manhole cover is movably connected to the first hinge, and the second manhole cover is movably connected to the second hinge.

7. The double-opening manhole cover according to claim 6, characterized in that, The manhole cover includes a first base and a second base, with the first base disposed on the second base. The inner diameter of the first base is smaller than the inner diameter of the second base. Both the first base and the second base have the opening. The first hinge and the second hinge are respectively connected to the outer side of the manhole cover assembly and the second base.

8. The double-opening manhole cover according to claim 1, characterized in that, The double-opening manhole cover also includes a support structure located at the opening. When closed, the support structure supports the first manhole cover and the second manhole cover.

9. The double-opening manhole cover according to claim 8, characterized in that, The support structure is a support platform that extends along the inner side of the opening on the well base.

10. The double-opening manhole cover according to claim 1, characterized in that, The first manhole cover and the second manhole cover are each provided with at least one through hole, the through hole communicating with the opening; and / or The first manhole cover and the second manhole cover are semi-circular.

Images