A two-stage well cover for gas valve wells

Abstract

This utility model relates to a two-stage manhole cover for gas valve wells, comprising a cover body including a primary manhole cover and a secondary manhole cover. The primary manhole cover is horizontally positioned with a through hole in its center; the secondary manhole cover is horizontally positioned on top of the primary manhole cover and covers the through hole. The advantages of this utility model are its simple structure, reasonable design, and the modular design of the manhole cover, which facilitates operation. It solves the problem of high labor intensity when opening and closing gas valve wells, reduces the frequency of handling and moving heavy manhole covers, thereby protecting the worker's health and improving the efficiency of gas well inspection and daily operation.

Description

Technical Field

[0001] This utility model relates to the field of gas valve well technology, specifically to a two-stage well cover for gas valve wells. Background Technology

[0002] Urban gas companies frequently need to open manhole covers when inspecting gas wells, and also to operate valves in valve wells. The materials used for opening manhole covers vary: metal covers (cast iron, ductile iron, bronze, etc.); high-strength steel fiber reinforced concrete covers; recycled resin covers (recycled resin-based composite materials); and polymer-based composite material inspection covers. These covers vary in weight, and the frequent opening and closing of them is labor-intensive, time-consuming, and inconvenient for daily inspections and maintenance, significantly impacting efficiency and wasting manpower.

[0003] Chinese Patent CN112239188A discloses a manhole cover opening machine, which includes support legs, a crossbeam, a jack, and a pulling device. The support legs and jack are vertically arranged. One end of the crossbeam is hinged to the top of the support leg, and the other end of the crossbeam is connected to the top of the piston rod of the jack via a connector. A long hole is vertically opened in the middle of the crossbeam along its length. The top of the pull rod of the pulling device moves through the long hole. Nuts are screwed onto the pull rods above and below the crossbeam, respectively, to movably abut against the crossbeam. Advantages: Through the cooperation of the support legs, crossbeam, jack, and pulling device, the manhole cover can be opened quickly and efficiently. Furthermore, the pulling device has static contact with the manhole cover, eliminating sparks and safety hazards. The unique design of the pulling device enables quick locking of the manhole cover, further achieving fast and efficient operation.

[0004] In addition, Chinese patent CN109056820A also discloses a manhole cover opener, including a support plate. The lower side of the support plate has three sets of fixed protrusions distributed at equal angles. The upper side of the support plate has a U-shaped support frame. The side of the support plate near the U-shaped support frame has a rectangular through groove. The upper side of the support plate near the rectangular through groove has a cushion. The two sides of the support plate near the cushion have two sets of symmetrically distributed leg slots. The upper middle position of the U-shaped support frame is connected to a support rod through a pivot. By using the lever principle in combination with the support rod, U-shaped support frame, and handle, the manhole cover can be opened in a time-saving and labor-saving manner. The support rod is installed and connected to the connecting holes of the fixed protrusions through the connecting column, which is convenient for construction personnel to install, disassemble and carry. The cushion and leg slots make it more comfortable to use.

[0005] Furthermore, Chinese patent CN113023635B also discloses a manhole cover opener, including: a lever, a support assembly, a hook assembly, and a drive assembly. The support assembly includes a triangular bracket and a fixed support, with the fixed support rotatably connected to the top of the triangular bracket. One end of the lever is hinged to the fixed support, and the lever rotates up and down around the hinge point. The hook assembly includes a hook slider sleeved on the lever, which slides along the length of the lever. Two chains are connected to the hook slider, and each chain has a lifting hook connected to its end away from the hook slider. The drive assembly includes a hydraulic mounting base, a hydraulic jack, and a drive slider. The drive slider is sleeved on the lever and located on the side of the hook slider away from the fixed support. The hydraulic jack is located on the top of the hydraulic mounting base, and its output end is connected to the drive slider. Several casters are provided at the bottom of the hydraulic mounting base. This invention has the advantages of simple and quick operation, convenient use, and time-saving and labor-saving manhole cover opening.

[0006] Although the manhole cover opening devices provided by the above patents can all achieve rapid opening of manhole covers, this solution requires the use of special manhole cover opening equipment during operation, which is not only inconvenient to operate, but also costly.

[0007] To address this issue, this utility model designs a two-stage manhole cover for gas valve wells. During routine inspections and valve operations, only the second-stage manhole cover needs to be opened, improving the efficiency of daily inspections and valve operations. When valve well maintenance is required, the first-stage manhole cover needs to be opened. Utility Model Content

[0008] This utility model provides a two-stage well cover for gas valve wells, aiming to solve the problems in the prior art.

[0009] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0010] A two-stage manhole cover for a gas valve well includes a cover body, which includes a primary manhole cover and a secondary manhole cover. The primary manhole cover is horizontally positioned and has a through hole at its center. The secondary manhole cover is horizontally distributed on the primary manhole cover and covers the through hole.

[0011] The beneficial effects of this utility model are: during use, routine inspections and valve operations only require opening the secondary well cover, which can be performed by female workers, making the work relatively easy;

[0012] When inspecting the valve well, simply open the first-level well cover. This requires several male operators to work together, which greatly improves efficiency.

[0013] This utility model has a simple structure and reasonable design. The manhole cover adopts a split design, which makes operation more convenient. It solves the problem of high labor intensity when opening and closing gas valve wells, reduces the number of times heavy manhole covers are moved, thereby protecting the health of workers and improving the work efficiency of gas well inspection and daily operation.

[0014] Based on the above technical solution, the present invention can be further improved as follows.

[0015] Furthermore, a support platform is provided inside the through hole, and the secondary manhole cover is located at the through hole, with the support platform supporting the secondary manhole cover.

[0016] The advantages of adopting the above-mentioned further solution are that during assembly, the secondary manhole cover can be directly supported by the support platform without the need for other additional accessories, making assembly convenient; at the same time, daily inspection is also very convenient, greatly improving efficiency.

[0017] Furthermore, the support platform has a ring-shaped structure.

[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple, the shape of the support platform is reasonably designed, and it is easy to support the secondary manhole cover.

[0019] Furthermore, the support platform includes multiple support blocks, which are evenly spaced and fixedly installed on the wall of the through hole along the edge of the through hole.

[0020] The advantages of adopting the above-mentioned further solution are that during assembly, multiple blocks are used to directly support the secondary manhole cover without the need for other additional accessories, making assembly convenient; at the same time, daily inspection is also very convenient, greatly improving efficiency.

[0021] Furthermore, the primary manhole cover has a circular or rectangular plate structure.

[0022] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the shape of the first-level manhole cover is reasonably designed, which can not only cover the valve well, but also make it neat and beautiful.

[0023] Furthermore, the through hole is a circular hole, and the secondary well cover is a circular cover.

[0024] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the shape of the secondary manhole cover matches the shape of the through hole, the design is reasonable, and it is neat and beautiful.

[0025] Furthermore, the secondary manhole cover has a through-hole at its center.

[0026] The advantages of adopting the above-mentioned further solution are that the structure is simple, the hook hole design is reasonable, it is convenient for operators to open the secondary well cover with tools, the operation is convenient, and the efficiency is greatly improved.

[0027] Furthermore, it also includes a safety grille, which is distributed below the primary manhole cover.

[0028] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the design is reasonable, and the safety of the valve well is increased by using a safety grille.

[0029] Furthermore, the longitudinal section of the safety grille is U-shaped.

[0030] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the shape of the safety grille is reasonably designed, which is convenient for assembly and can ensure the safety of the valve well.

[0031] Furthermore, a mounting hole is provided at the center of the bottom of the safety grille, and a maintenance grille can be detachably installed at the mounting hole.

[0032] The advantages of adopting the above-mentioned further solutions are that the structure is simple, the design is reasonable, and the maintenance grid facilitates the corresponding operations, making the operation convenient.

[0033] Furthermore, a support is fixedly installed at the mounting hole, and the inspection grille is placed on the support.

[0034] The advantages of adopting the above-mentioned further solution are that the structure is simple, the design is reasonable, the maintenance grilles are distributed at the mounting holes and supported by the support members, which facilitates maintenance work, makes the operation simple, and greatly improves efficiency.

[0035] Furthermore, it also includes a derrick, on which the safety grille is fixedly installed, and the primary manhole cover is distributed on the derrick.

[0036] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and uses a derrick to centrally assemble the primary well cover and safety grille at the wellhead of the valve well, which is convenient to assemble and has a high degree of integration.

[0037] Furthermore, the edge of the primary manhole cover is fixedly connected with a snap-fit ​​block assembly, and the manhole frame is provided with a snap-fit ​​groove assembly, the snap-fit ​​block assembly can snap into the snap-fit ​​groove assembly.

[0038] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. By using the snap-fit ​​block assembly and the snap-fit ​​groove assembly, the first-level manhole cover can be quickly assembled on the manhole frame, and the stability and accuracy of the first-level manhole cover assembly can be increased.

[0039] Furthermore, the snap-fit ​​block assembly includes multiple snap-fit ​​blocks, which are evenly spaced and fixedly installed on the edge of the primary manhole cover; the snap-fit ​​groove assembly includes multiple snap-fit ​​grooves, which are evenly spaced on the manhole frame, and the multiple snap-fit ​​blocks can be snapped into the multiple snap-fit ​​grooves respectively.

[0040] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and utilizes multiple snap-fit ​​blocks and multiple snap-fit ​​slots to achieve rapid assembly of the first-level manhole cover on the manhole frame. It can also increase the stability and accuracy of the first-level manhole cover assembly and make assembly convenient. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0043] Figure 3 This is an assembly drawing of the primary manhole cover, secondary manhole cover, and safety grille in this utility model;

[0044] Figure 4 This is a partially exploded view of the primary manhole cover, secondary manhole cover, and safety grille of this utility model;

[0045] Figure 5 This is a schematic diagram of the structure of the primary manhole cover in this utility model;

[0046] Figure 6 This is a schematic diagram of the structure of the secondary manhole cover in this utility model;

[0047] Figure 7 This is an assembly drawing of the safety grille and the maintenance grille in this utility model;

[0048] Figure 8 This is a schematic diagram of the structure of the safety grille in this utility model;

[0049] Figure 9 This is a schematic diagram of the structure of the maintenance grille in this utility model.

[0050] The attached diagram lists the components represented by each number as follows:

[0051] 1. Primary manhole cover; 2. Secondary manhole cover; 3. Support platform; 4. Hook hole; 5. Safety grille; 6. Inspection grille. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0053] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] Example 1

[0057] like Figures 1 to 9 As shown, this embodiment provides a two-stage manhole cover for a gas valve well, including a cover body. The cover body includes a primary manhole cover 1 and a secondary manhole cover 2. The primary manhole cover 1 is horizontally arranged and has a through hole at its center. The secondary manhole cover 2 is horizontally distributed on the primary manhole cover 1 and covers the through hole.

[0058] During use, routine inspections and valve operations only require opening the secondary well cover 2. This operation can also be performed by female workers, making the work relatively easy.

[0059] When the valve well is being repaired, simply open the first-level well cover 1. This requires several male operators to work together, which greatly improves efficiency.

[0060] Preferably, in this embodiment, the first-level manhole cover 1 is provided with an opening hole, which makes it convenient for operators to use a hook to lift the first-level manhole cover 1 upwards.

[0061] In addition, the aforementioned Class I manhole cover 1 is equipped with markings such as flags or numbers (which serve only as identification and have no other substantial meaning) to facilitate the operation of the corresponding manhole cover by the workers.

[0062] Preferably, in this embodiment, an opening hole is provided at the center of the secondary manhole cover 2, which facilitates the operator to lift the secondary manhole cover 2 upwards using a hook.

[0063] This embodiment has a simple structure and reasonable design. The manhole cover adopts a split design, which makes the operation more convenient. It solves the problem of high labor intensity when opening and closing gas valve wells, reduces the number of times heavy manhole covers are moved, thereby protecting the health of workers and improving the work efficiency of gas well inspection and daily operation.

[0064] Example 2

[0065] Based on Embodiment 1, in this embodiment, a support platform 3 is provided inside the through hole, the secondary manhole cover 2 is located at the through hole, and the support platform 3 supports the secondary manhole cover 2.

[0066] During assembly, the secondary manhole cover 2 is directly supported by the support platform 3, without the need for any other additional accessories, making assembly convenient; at the same time, daily inspection is also very convenient, greatly improving efficiency.

[0067] Preferably, in this embodiment, the support 3 can be formed by extending from the edge of the through hole, or it can be set separately and fixed on the hole wall of the through hole.

[0068] Example 3

[0069] Based on Example 2, in this example, the support platform 3 has a ring-shaped structure.

[0070] The design is simple, and the shape of the support platform 3 is reasonably designed to support the secondary manhole cover 2.

[0071] During use, routine inspections and valve operations can be performed simply by removing the secondary manhole cover 2 from the annular support 3. This operation is also suitable for female workers and is relatively easy.

[0072] When the valve well is being repaired, simply open the first-level well cover 1. This requires several male operators to work together, which greatly improves efficiency.

[0073] Alternatively, the aforementioned support platform 3 can also adopt other suitable geometric shapes, such as elliptical rings.

[0074] Example 4

[0075] Based on Embodiment 2, in this embodiment, the support platform 3 includes multiple support blocks, which are evenly spaced and fixedly installed on the wall of the through hole along the edge of the through hole.

[0076] During assembly, multiple support blocks directly support the secondary manhole cover 2, eliminating the need for any additional accessories and making assembly convenient. At the same time, daily inspections are also very convenient, greatly improving efficiency.

[0077] During use, routine inspections and valve operations can be performed simply by removing the secondary manhole cover 2 from the multiple supports. This operation can also be performed by female workers and is relatively easy.

[0078] When the valve well is being repaired, simply open the first-level well cover 1. This requires several male operators to work together, which greatly improves efficiency.

[0079] Preferably, in this embodiment, the aforementioned plurality of support blocks are each rectangular blocks, which are integrally formed with the through holes or individually fixed to the hole walls of the through holes.

[0080] The above embodiments 3 and 4 are parallel solutions, both of which can achieve the support platform 3 supporting the secondary manhole cover 2. In both of the above solutions, the secondary manhole cover 2 and the primary manhole cover 1 are designed separately, which facilitates daily inspection and maintenance operations and greatly improves work efficiency.

[0081] Alternatively, the secondary manhole cover 2 can be hinged to the primary manhole cover 1 for rotational connection, which also allows for quick routine inspection and maintenance. However, the primary manhole cover 1 and secondary manhole cover 2 are designed as a single unit, making them less convenient to use than the aforementioned solution.

[0082] Example 5

[0083] Based on the above embodiments, in this embodiment, the primary manhole cover 1 is in the form of a circular plate or a rectangular plate.

[0084] The solution has a simple structure, and the shape of the first-level manhole cover 1 is reasonably designed, which can not only cover the valve well, but also make it neat and beautiful.

[0085] Based on the above scheme, the first-level manhole cover 1 adopts a circular plate structure or a rectangular plate structure to be suitable for valve wells of different shapes.

[0086] In addition, the shape of the aforementioned secondary manhole cover 2 can be the same as or different from that of the primary manhole cover 1, for example:

[0087] (1) The shape of the above-mentioned secondary manhole cover 2 can be the same as that of the primary manhole cover 1, that is, both the primary manhole cover 1 and the secondary manhole cover 2 are circular.

[0088] (2) The shape of the above-mentioned secondary manhole cover 2 can be the same as that of the primary manhole cover 1, that is, both the primary manhole cover 1 and the secondary manhole cover 2 are square.

[0089] (3) The shape of the secondary manhole cover 2 can be different from that of the primary manhole cover 1, that is, the primary manhole cover 1 is square and the secondary manhole cover 2 is round.

[0090] (4) The shape of the secondary manhole cover 2 can be different from that of the primary manhole cover 1, that is, the primary manhole cover 1 is round and the secondary manhole cover 2 is square.

[0091] Example 6

[0092] Based on the above embodiments, in this embodiment, the through hole is a circular hole, and the secondary well cover 2 is a circular cover.

[0093] The design is simple, with the shape of the secondary manhole cover 2 matching the shape of the through hole, resulting in a reasonable, neat, and aesthetically pleasing design.

[0094] Example 7

[0095] Based on the above embodiments, in this embodiment, the secondary manhole cover 2 is provided with a hook hole 4 that runs vertically through the center.

[0096] The design is simple and the hook hole 4 is reasonably designed, which makes it easy for operators to open the secondary well cover 2 with tools, making the operation convenient and greatly improving efficiency.

[0097] During use, routine inspections and valve operations only require removing the secondary well cover 2 from the annular support 3. For example, the secondary well cover 2 can be opened by using a hook with the hook hole 4. This operation can also be performed by female workers and is relatively easy.

[0098] When the valve well is being repaired, a hook can be used to open the first-level well cover 1 with the through hole. At this time, several male operators are required to operate together, which greatly improves efficiency.

[0099] Preferably, in this embodiment, the hook hole 4 is a circular hole, but other suitable shapes, such as a square hole, can also be used.

[0100] The number of hook holes 4 can be one, and in this case, the hook hole 4 is preferably set at the center of the secondary well cover 2.

[0101] Alternatively, the hook hole 4 can also be set at the edge of the secondary well cover 2.

[0102] Alternatively, the number of hook holes 4 can be set to multiple, such as two. In this case, the two hook holes 4 can be set alternately on the secondary manhole cover 2. For example, one hook hole 4 is set at the center of the secondary manhole cover 2, and the other hook hole 4 is set at the edge of the secondary manhole cover 2.

[0103] Example 8

[0104] Based on the above embodiments, this embodiment also includes a safety grille 5, which is distributed below the primary manhole cover 1.

[0105] The scheme has a simple structure and reasonable design, and uses safety grille 5 to increase the safety of the valve well.

[0106] Preferably, in this embodiment, the safety grille 5 has a mesh structure.

[0107] Alternatively, the safety grille 5 can also adopt other structures, such as the safety grille 5 consisting of an outer frame and multiple strips, with the multiple strips evenly spaced and fixedly installed on the outer frame.

[0108] Example 9

[0109] Based on Example 8, in this example, the longitudinal section of the safety grille 5 is U-shaped.

[0110] The solution has a simple structure and the safety grille 5 has a reasonable shape design, which is convenient for assembly and can ensure the safety of the valve well.

[0111] Preferably, in this embodiment, the cross-section of the safety grille 5 is circular.

[0112] Example 10

[0113] Based on embodiment 9, in this embodiment, the safety grille 5 has a mounting hole at the center of its bottom, and a maintenance grille 6 is detachably installed at the mounting hole.

[0114] The scheme has a simple structure and reasonable design. The installation of inspection grilles 6 facilitates the corresponding operations and makes the operation convenient.

[0115] During use, routine inspections and valve operations only require removing the secondary well cover 2 from the annular support 3. For example, the secondary well cover 2 can be opened by using a hook with the hook hole 4. This operation can also be performed by female workers and is relatively easy.

[0116] When the valve well is being repaired, a hook can be used to open the first-level well cover 1 with the through hole. At this time, several male operators are required to operate together, which greatly improves efficiency.

[0117] Meanwhile, the inspection grille 6 can be manually opened for easy inspection.

[0118] Preferably, in this embodiment, the mounting hole is a circular hole, and the maintenance grille 6 is a circular grille, the shape and size of which are adapted to the mounting hole.

[0119] Example 11

[0120] Based on Embodiment 10, in this embodiment, a support is fixedly provided at the mounting hole, and the inspection grille 6 is placed on the support.

[0121] The solution has a simple structure and reasonable design. The maintenance grilles 6 are distributed at the mounting holes and supported by the support components, which facilitates maintenance work, makes operation simple, and greatly improves efficiency.

[0122] During use, routine inspections and valve operations only require removing the secondary well cover 2 from the annular support 3. For example, the secondary well cover 2 can be opened by using a hook with the hook hole 4. This operation can also be performed by female workers and is relatively easy.

[0123] When the valve well is being repaired, a hook can be used to open the first-level well cover 1 with the through hole. At this time, several male operators are required to operate together, which greatly improves efficiency.

[0124] At the same time, the inspection grille 6 can be manually removed directly from the support to open the inspection grille 6 for easy maintenance.

[0125] Preferably, in this embodiment, the support member is a support ring, which is horizontally fixedly installed at the lower end of the mounting hole. Its outer side is fixedly connected to the hole wall of the mounting hole. The maintenance grille 6 is distributed in the mounting hole, and the support ring supports the maintenance grille 6.

[0126] Alternatively, multiple support blocks can be used instead of the aforementioned support ring, with the multiple support blocks being evenly spaced and fixedly installed on the wall of the mounting hole along the circumference of the mounting hole.

[0127] Alternatively, the aforementioned inspection grille 6 can also be assembled in other ways, such as hinged to the safety grille 5. During maintenance, the inspection grille 6 can be manually flipped over and placed on top of the safety grille 5.

[0128] Preferably, in this embodiment, a lifting ring is rotatably connected to the above-mentioned maintenance grille 6. The lifting ring makes it easy for operators to open the maintenance grille 6, which is simple to operate and saves time and effort.

[0129] Example 12

[0130] Based on embodiments 8 to 11, this embodiment also includes a derrick, the safety grille 5 is fixedly installed on the derrick, and the primary manhole cover 1 is distributed on the derrick.

[0131] The solution has a simple structure and reasonable design. It uses a derrick to centrally assemble the primary well cover 1 and safety grille 5 at the wellhead of the valve well, which is convenient to assemble and has a high degree of integration.

[0132] Preferably, in this embodiment, the derrick adopts a cylindrical frame, which is assembled at the valve wellhead to facilitate the installation of the safety grille 5, without affecting other operations.

[0133] In actual assembly, the aforementioned derrick is fixedly installed at the wellhead of the valve well.

[0134] Based on the above scheme, two hooks are installed on the derrick in a relatively rotatable manner, and the safety grille 5 is hooked on the two hooks, which makes it easy to install and remove.

[0135] Alternatively, the aforementioned safety grille 5 can also be detachably connected to the derrick with bolts.

[0136] Example 13

[0137] Based on embodiment 12, in this embodiment, the edge of the primary manhole cover 1 is fixedly connected with a snap-fit ​​block assembly, and the manhole frame is provided with a snap-fit ​​groove assembly, and the snap-fit ​​block assembly can snap into the snap-fit ​​groove assembly.

[0138] The solution has a simple structure and reasonable design. It uses the snap-fit ​​block assembly and snap-fit ​​groove assembly to achieve rapid assembly of the first-level manhole cover 1 on the manhole frame, and can increase the stability and accuracy of the assembly of the first-level manhole cover 1.

[0139] Example 14

[0140] Based on embodiment 13, in this embodiment, the snap-fit ​​block assembly includes multiple snap-fit ​​blocks, which are evenly spaced and fixedly installed on the edge of the first-stage manhole cover 1; the snap-fit ​​groove assembly includes multiple snap-fit ​​grooves, which are evenly spaced and distributed on the manhole frame, and the multiple snap-fit ​​blocks can be snapped into the multiple snap-fit ​​grooves respectively.

[0141] The solution has a simple structure and reasonable design. It uses multiple snap-fit ​​blocks and multiple snap-fit ​​slots to achieve rapid assembly of the first-level manhole cover on the manhole frame, and can increase the stability and accuracy of the first-level manhole cover assembly, making assembly convenient.

[0142] During assembly, after the primary manhole cover 1 is placed on the manhole frame, the primary manhole cover 1 is manually rotated so that multiple locking blocks are engaged in multiple locking slots, thereby preventing the primary manhole cover 1 from shifting and increasing its stability.

[0143] Alternatively, the aforementioned secondary manhole cover 2 can also be detachably connected to the primary manhole cover 1 using bolts.

[0144] The disassembly and assembly process of the two-stage well cover for the gas valve well of this utility model is as follows:

[0145] During assembly, first, the derrick is installed on the valve well hole, the safety grille 5 is installed on the derrick hook, then the primary manhole cover 1 is aligned with the derrick mounting seat and installed on the derrick, and the manhole cover is rotated so that the multiple locking blocks on the primary manhole cover 1 are respectively locked into the multiple locking slots on the derrick; then, the secondary manhole cover 2 is placed in the through hole on the primary manhole cover 1.

[0146] When disassembling, to open the first-level manhole cover 1, insert the manhole cover opening hook into the opening hole on the first-level manhole cover 1 and lift it upwards to open it;

[0147] When opening the secondary manhole cover 2, insert the manhole cover opening hook into the opening hole on the secondary manhole cover 2 and lift it upwards to open it.

[0148] This utility model provides a two-stage manhole cover for gas valve wells. The manhole cover adopts a split design, which solves the problem of high labor intensity when opening and closing gas valve wells, reduces the number of times heavy manhole covers are moved, thereby protecting the workers' health and improving the work efficiency of gas well inspection and daily operation.

[0149] The two-stage manhole cover for gas valve wells designed in this utility model has the following advantages:

[0150] First, reducing operational risks: Traditional gas well covers are heavy, and workers are prone to slipping and falling during opening and closing due to exhaustion or improper operation. In contrast, the two-stage well cover design of this invention features a lighter first-stage cover. Workers only need to open this first-stage cover for routine inspections and valve operation, significantly reducing operational difficulty and physical exertion, thereby minimizing the risk of falls due to improper operation.

[0151] Second, to improve work efficiency, traditional gas well cover designs, whether metal or composite material, require the entire cover to be opened for every routine inspection and valve operation due to weight and opening method limitations. This increases the labor intensity of workers and prolongs operation time. The two-stage well cover design of this utility model allows for easy inspection and valve operation by opening only the lighter, single-stage cover, significantly reducing operational complexity and time costs, and improving work efficiency.

[0152] Third, the need to optimize maintenance processes: When more complex operations such as valve well maintenance are involved, the secondary well cover can be opened for in-depth inspection and repair. This tiered design makes the maintenance process clearer and more efficient, allowing different levels of well covers to be opened according to different maintenance needs, thereby optimizing the overall maintenance workflow.

[0153] Fourth, it promotes the demand for technological innovation. The application of this utility model not only solves practical problems, but also helps to promote the continuous development of the gas business and enhance overall competitiveness.

[0154] To address the issues of high labor intensity and frequent opening of heavy manhole covers during gas valve well inspections, this utility model aims to protect workers' health and improve the efficiency of gas well inspections and daily operations. The following is a comparison of these innovative achievements with similar technologies in terms of theoretical methods, solutions to key or common technical problems, main technical indicators, and overall technical level:

[0155] I. In terms of theoretical methodology, traditional gas valve well inspection operations mainly rely on manual operation, which is labor-intensive and inefficient. The innovative achievement introduces a millstone design concept into the theoretical methodology. Through millstone-like operation, workers open and close the primary manhole cover, thereby reducing the load on the valve well cover. Simultaneously, this utility model adopts an integrated design concept, incorporating information such as confined space warnings, management unit affiliation, emergency telephone number, and valve well type onto the manhole cover. Compared with similar technologies, this innovative achievement places greater emphasis on user-friendly design and ease of operation, fully considering the labor intensity of workers, operational safety, and daily management of the valve well. Furthermore, by optimizing the work process, it reduces the unnecessary number of times the entire manhole cover needs to be opened and closed, improving work efficiency.

[0156] II. Regarding the main technical indicators of this utility model, this utility model is a two-stage manhole cover. Through actual testing, in terms of reducing labor intensity, after using this utility model, when workers open the first-stage manhole cover, compared with the previous fully open manhole cover, the weight of the first-stage manhole cover accounts for 20% of the total weight of the manhole cover. Correspondingly, the labor intensity of opening only the first-stage manhole cover is reduced by 80%. In terms of improving work efficiency, compared with the traditional valve manhole cover, the use of this utility model improves the efficiency of gas well inspection and daily operation.

[0157] In summary, the innovative achievement demonstrates significant advantages in theoretical methods, solutions to key or common technical problems, main technical indicators, and overall technical level regarding the opening of heavy-duty manhole covers during gas valve well inspections. Compared with similar technologies, this innovative achievement is more in line with actual needs, better protects workers' health, and improves the efficiency of gas well inspections and daily operations.

[0158] In addition, the two-stage manhole cover for gas valve wells designed in this utility model provides support for the development of urban gas business in terms of operation procedures and risk management. It not only improves work efficiency and safety, but also optimizes the maintenance process, and can promote technological innovation in urban gas business to a certain extent.

[0159] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0160] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0161] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A two-stage access cover for a gas valve pit, characterised in that: The cover includes a primary manhole cover (1) and a secondary manhole cover (2). The primary manhole cover (1) is horizontally positioned and has a through hole at its center. The secondary manhole cover (2) is horizontally positioned on the primary manhole cover (1) and covers the through hole.

2. A two-stage access cover for a gas valve pit according to claim 1, characterised in that: A support platform (3) is provided inside the through hole, and the secondary manhole cover (2) is located at the through hole, with the support platform (3) supporting the secondary manhole cover (2).

3. A two-stage access cover for a gas valve pit according to claim 2, characterised in that: The support platform (3) has a ring-shaped structure.

4. The two-stage manhole cover for gas valve vaults of claim 2, wherein: The support platform (3) includes multiple support blocks, which are evenly spaced and fixedly installed on the wall of the through hole along the edge of the through hole.

5. The two-stage manhole cover for gas valve vaults of claim 1, wherein: The first-level manhole cover (1) has a circular plate structure or a rectangular plate structure.

6. The two-stage manhole cover for gas valve vaults of claim 1, wherein: The through hole is a circular hole, and the secondary well cover (2) is a circular cover.

7. The two-stage manhole cover for gas valve vaults of claim 1, wherein: The secondary manhole cover (2) has a through-hole (4) at its center.

8. The two-stage manhole cover for gas valve vaults according to any one of claims 1-7, characterized in that: It also includes a safety grille (5) which is distributed below the primary manhole cover (1).

9. A two-stage access cover for a gas valve pit according to claim 8, characterised in that: The longitudinal section of the safety grille (5) is U-shaped.

10. The two-stage well cover for gas valve wells according to claim 9, characterized in that: The safety grille (5) has a mounting hole at the center of its bottom, and a maintenance grille (6) is detachably installed at the mounting hole.

11. The two-stage well cover for gas valve wells according to claim 10, characterized in that: A support is fixedly installed at the mounting hole, and the inspection grille (6) is placed on the support.

12. The two-stage well cover for gas valve wells according to claim 8, characterized in that: It also includes a derrick, the safety grille (5) is fixedly installed on the derrick, and the primary manhole cover (1) is distributed on the derrick.

13. The two-stage well cover for gas valve wells according to claim 12, characterized in that: The edge of the first-level manhole cover (1) is fixedly connected with a snap-fit ​​block assembly, and the manhole frame is provided with a snap-fit ​​groove assembly, which can snap into the snap-fit ​​groove assembly.

14. The two-stage well cover for gas valve wells according to claim 13, characterized in that: The snap-fit ​​block assembly includes multiple snap-fit ​​blocks, which are evenly spaced and fixedly installed on the edge of the primary manhole cover (1); the snap-fit ​​groove assembly includes multiple snap-fit ​​grooves, which are evenly spaced on the manhole frame, and the multiple snap-fit ​​blocks can be snapped into the multiple snap-fit ​​grooves respectively.

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