Manhole cover and asphalt pavement seamless connection construction method and adjustable manhole cover thereof

Abstract

The invention is suitable for the technical field of asphalt pavement construction, and provides an inspection well lid and asphalt pavement seamless connection construction method and an adjustable inspection well lid thereof.The method comprises the operation steps of S1, original pavement excavation and leveling, S2, water stable layer paving, S3, well lifting, S4, anti-sinking butt strap mounting, S5, asphalt bottom surface layer paving, S6, well lid mounting and S7, asphalt pavement surface layer paving. After the well lid is installed and an asphalt surface layer is paved, a paver and a wheel type road roller are adopted for paving and rolling the asphalt surface layer, the height difference between the well lid and the asphalt surface layer is closely concerned in the paving and rolling process, local manual cooperation needs to be paid attention to, seamless and smooth connection of the well lid and the asphalt surface layer is guaranteed, and the well lid and the asphalt surface layer can be continuously paved. The inspection well can be rapidly installed and adjusted, smooth seamless connection between the inspection well and the asphalt pavement is achieved, the road construction quality is greatly improved, and the construction progress is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement construction, and more specifically, it relates to a construction method for seamless connection between inspection well covers and asphalt pavements and an adjustable inspection well cover. Background Art

[0002] With the development of society and the continuous increase of motor vehicles, higher requirements are also put forward for urban roads. According to incomplete statistics, there is an inspection well every 10 - 15 meters on average in urban roads. If there is a height difference between an inspection well and the asphalt pavement during installation, when a vehicle passes by, it will cause 4 bumps, which greatly affects people's driving experience. Therefore, the installation quality of inspection wells directly affects the smoothness of asphalt pavements and thus affects people's driving experience.

[0003] However, since bricks or wooden blocks are currently used to install and adjust inspection wells, the installation and adjustment speed of inspection wells is slow and it is not easy to level them. After the installation and adjustment of inspection wells are completed, ordinary cement is used, resulting in a long curing period and easy collapse. At present, anti-settlement slabs are used on roads, and long-term rolling of vehicles on inspection well covers easily causes collapse around the wells. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a construction method for seamless connection between inspection well covers and asphalt pavements and an adjustable inspection well cover that can quickly install and adjust inspection wells, achieve smooth and seamless connection between inspection wells and asphalt pavements, greatly improve the quality of road construction, and speed up the construction progress.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A construction method for seamless connection between an inspection well cover and an asphalt pavement, and the operation steps are as follows: S1. Excavate and level the original road surface, and then select a Q345B manganese steel plate with a thickness of δ = 10 mm and a diameter 1.3 times the wellhead diameter and lay it on the wellhead; S2. Pave the water-stable layer The water-stable base layer should be paved in layers by a paver. If there are too many obstacles and conditions are not available, manual cooperation with excavators and loaders can be used for paving. When paving the top layer of the water-stable base layer, a screed should be used to level it to ensure that the unevenness is not greater than 1%. After the base layer paving is completed, at the position of the protective steel plate of the wellhead, chisel the water-stable base layer and remove the protective steel plate; S3. Raise the well S3-1. Thoroughly clean the water-stable base layer gravel on the wellhead surface to expose the wellhead top surface; S3-2. Build the well to a position 200 mm below the elevation of the water-stable base layer, ensuring that each layer of bricks is laid flat and the mortar joints are full to avoid phenomena such as hollowing and cracking; S3-3. Install the rain and sewage branch pipes simultaneously according to the requirements of the drawing design. The pipe diameter, direction, and elevation shall meet the design requirements. The connection between the pipe and the well wall shall be tight. After the wellhead masonry is completed, use a spirit level to check and ensure the flatness of the wellhead. S4. Installation of anti-settlement slabs To ensure that the area around the wellhead does not collapse, cut a square pit with a length of 2m × width of 2m and a depth of 200mm around the wellhead, then lift and place the pre-bound steel mesh, and then carry out pouring; alternatively, prefabricated anti-settlement slabs can also be used; regardless of the method used, the upper plane elevation of the anti-settlement slab shall be on the same reference plane as the elevation of the water-stabilized base course. S5. Asphalt bottom layer paving Before installing the manhole cover, pave in two layers according to the requirements of the drawing design. Before paving the asphalt bottom layer, use the steel plate described above to protect the wellhead. After the bottom layer asphalt paving and compaction by the rubber-tyred roller, use a portable electric cutting machine to cut out a circular contour with a diameter 50-100mm larger than the diameter of the steel plate along the edge of the protective steel plate, and then remove the steel plate. S6. Manhole cover installation S6-1. In the direction of the road extension, mark the elevation of the asphalt surface layer (after compaction) on the roadside of the road on the curb according to the design requirements; calculate the elevation of the asphalt surface layer at the center line position of the road according to the designed transverse slope of the road (temporarily 1%) and mark it on the scale. After the manhole cover is in place, hang a steel wire between two points to find the reference line for the installation elevation of the manhole cover at the wellhead. S6-2. Before the manhole cover is in place, carefully adjust the adjustable inspection manhole cover so that the elevation and slope of the manhole cover are consistent with the elevation and slope of the steel wire. At the same time, use a spirit level to ensure the flatness in the direction of the road extension until the installation error of the manhole cover is within the range required by the drawing. S6-3. Install a circular formwork on the outer edge of the manhole cover. The outer diameter of the formwork is 50-80mm larger than the diameter of the manhole cover, and the height is slightly higher than the manhole cover by 30-50mm. Fill and compact the gap between the wellhead and the manhole cover with rubber and plastic sponge, and then fill it with dry-mixed mortar stirred with water to prevent omission after pouring the quick-setting cement. S6-4. Finally, pour and vibrate the quick-setting cement (also known as inspection well reinforcement concrete) until it is dense. In particular, vibrate thoroughly under the outer edge of the manhole cover and at the connection between the manhole cover and the wellhead, and carefully check. The outer formwork can be removed after two hours, and the concrete under the outer edge of the manhole cover is chiseled to be flush with the periphery of the manhole cover. S7. Asphalt pavement surface layer paving After the manhole cover is installed and the asphalt surface layer paving can be carried out, use a paver and a wheeled roller to carry out the paving and compaction of the asphalt surface layer. During the paving and compaction process, not only pay close attention to the height difference between the manhole cover and the asphalt surface layer, but also pay attention to local manual cooperation to ensure seamless and flat connection between the manhole cover and the asphalt surface layer.

[0006] Adjustable inspection well cover, including a well cover, an annular base, and four support components arranged between the well cover and the annular base. The four support components are arranged between the well cover and the annular base in a circumferential array. The support component includes a rotating column, the rotating column is rotatably connected to the annular base, a screw rod is arranged on the upper surface of the rotating column, a threaded groove is opened on the upper surface of the rotating column, the lower end of the screw rod extends into the threaded groove and is threadedly connected to the threaded groove. The upper end of the screw rod is hinged with a mounting plate, and the mounting plate is detachably mounted on the lower surface of the well cover. The inside of the annular base is hollow, an alignment component is arranged on the outer surface of the annular base, and a synchronization component for controlling the simultaneous operation of the four rotating columns is arranged inside the annular base.

[0007] The present invention is further configured as: the synchronization component includes a synchronization ring arranged inside the annular base. Four arc-shaped support seats arranged in a circumferential array are arranged on the bottom wall of the annular base. A sliding groove is opened on the upper surface of the arc-shaped support seat. A connecting slider that slides in the sliding groove is arranged on the lower surface of the synchronization ring. A connecting shaft is arranged on the lower surface of the right rotating column, and the lower end of the connecting shaft rotatably penetrates into the annular base. A first gear located inside the synchronization ring is arranged at the lower end of the connecting shaft. The lower surfaces of the front and rear two rotating columns are also provided with two connecting shafts whose lower ends movably penetrate into the annular base. The lower ends of the front and rear two connecting shafts are provided with second gears located inside the synchronization ring. Transmission tooth grooves meshing with the first gear and the second gear are opened on the inner side surfaces of the synchronization ring close to the first gear and the second gear. A conversion transmission component connected to the left rotating column is arranged on the left side of the synchronization ring. A linkage component is arranged between the front and rear two second gears.

[0008] The present invention is further configured as: the alignment component includes an observation plate arranged on the front side of the annular base. A transmission shaft is arranged on the rear side surface of the observation plate, and the rear end of the transmission shaft rotatably penetrates into the annular base. A transmission cavity sleeved on the outer surface of the transmission shaft is opened on the front side of the annular base. A worm gear is sleeved on the outer surface of the transmission shaft located inside the transmission cavity. A worm is meshed with the outer surface of the worm gear. The upper end of the worm rotatably penetrates out of the upper surface of the annular base, and a handle is arranged on the upper surface of the worm.

[0009] The present invention is further configured as: the linkage component includes an arc-shaped plate arranged inside the annular base. A connecting plate is arranged on the outer surface of the arc-shaped plate close to the second gear, and the bottom of the second gear is rotatably connected to the connecting plate. One end of the transmission shaft located inside the annular base is provided with a swinging plate. A sleeve shaft is arranged on the side of the swinging plate away from the transmission shaft. A rotating push plate is rotatably sleeved on the outer surface of the sleeve shaft. The upper side of the rotating push plate is hinged with the lower side of the connecting plate. A plurality of limiting sliding rods are arranged between the upper and lower inner walls of the annular base, and the arc-shaped plate is slidably sleeved on the outer surface of the limiting sliding rods.

[0010] The present invention is further configured such that: the conversion drive assembly includes a synchronous gear and an asynchronous gear. The synchronous gear and the asynchronous gear are symmetrically arranged on the inner and outer sides of the synchronous ring respectively. And on the surfaces of the synchronous ring close to the synchronous gear and the asynchronous gear, drive tooth grooves engaged with the synchronous gear and the asynchronous gear are respectively provided. The top wall on the left side of the annular base is provided with a conversion housing. The upper surface of the synchronous gear is provided with a first shaft. The upper surface of the first shaft rotatably penetrates into the bottom wall of the conversion housing. The upper end of the first shaft is rotatably connected to a third shaft. Activity grooves communicating with each other are provided on the upper surfaces of the third shaft and the first shaft. The lower surface of the left rotating column is provided with an activity shaft. The lower end of the activity shaft movably penetrates into the conversion housing. The lower end of the activity shaft can extend into the activity groove of the first shaft through the activity groove of the third shaft. A plurality of circumferentially arranged limiting tooth grooves are provided on the inner walls of the two activity grooves. The shape of the limiting tooth groove is a horizontal isosceles triangle. A plurality of circumferentially arranged contraction grooves are provided on the outer surface of the lower end of the activity shaft. A limiting tooth block is slidably connected in the contraction groove. One side of the limiting tooth block extends out of the outer surface of the activity shaft and fits with the limiting tooth groove. A second spring is provided between the limiting tooth block and the inner wall of the contraction groove.

[0011] The present invention is further configured such that: the upper surface of the asynchronous gear is provided with a second shaft. The upper end of the second shaft rotatably penetrates into the conversion housing. Two sprockets are sleeved on the outer surfaces of the upper end of the second shaft and the third shaft. A chain is drivingly connected between the two sprockets.

[0012] The present invention is further configured such that: a sleeve ring is rotatably sleeved on the outer surface of the activity shaft. A hinge plate is hinged to the outer surface of the sleeve ring. A T-shaped contact rod is hinged to the lower side of the hinge plate. One end of the cross bar of the T-shaped contact rod slidably penetrates out of the outer surface of the conversion housing. A tension spring movably sleeved on the outer surface of the cross bar is provided between the vertical plate of the T-shaped contact rod and the inner wall of the conversion housing. An extrusion block is provided on the upper surface of the arc-shaped plate. An inclined surface is provided on the upper side of the extrusion block. The end of the T-shaped contact rod located outside the conversion housing contacts and slides on the inclined surface of the extrusion block.

[0013] The present invention is further configured such that: a limiting sliding groove is provided at the bottom of the left rotating column. The upper end of the activity shaft slidably penetrates into the limiting sliding groove. A limiting sliding block for sliding in the limiting sliding groove is provided at the upper end of the activity shaft. Limiting sliding grooves are also provided at the bottoms of the front and rear rotating columns. The upper ends of the front and rear connecting shafts slidably penetrate into the limiting sliding grooves and are also provided with limiting sliding blocks.

[0014] The present invention is further configured such that: on the inner wall of the annular base close to the transmission shaft, four mounting plates are provided. The four mounting plates are arranged in parallel in two groups on the inner wall of the annular base, and the two groups of mounting plates are located on the left and right sides of the transmission shaft. An installation slide rod is provided between the two mounting plates. A limiting plate is slidably sleeved on the outer surface of the installation slide rod. A first spring that is movably sleeved on the outer surface of the installation slide rod is provided between the surface of the limiting plate facing away from the transmission shaft and the mounting plate. A cam that contacts the limiting plate is sleeved on the outer surface of the transmission shaft. A stop block is provided on the side of the limiting plate facing the synchronizing ring. A push rod is provided on the surface of the stop block close to the limiting plate. The inside of the limiting plate is hollow. The other end of the push rod slides through the limiting plate into the inside. An extrusion rod is provided inside the limiting plate. One end of the extrusion rod slides out of the limiting plate and contacts the outer surface of the cam. A rotating plate is hinged between the extrusion rod and the push rod. A tension spring is also provided between the stop block and the limiting plate. A positioning plate is provided on the outer surface of the synchronizing ring facing the transmission shaft, and the positioning plate can contact the stop block.

[0015] The advantages of the present invention are as follows: Firstly, the present invention can quickly install and adjust inspection wells, enabling the inspection wells to achieve smooth and seamless connection with the asphalt pavement, greatly improving the road construction quality and accelerating the construction progress.

[0016] Secondly, for the adjustable inspection well cover of the present invention, when adjusting the inclination angle of the well cover, it can automatically control the rotation directions of the rotating columns on the left and right sides to be opposite, and the other two rotating columns remain stationary. When adjusting the vertical direction of the well cover, it can automatically control the rotation directions of the four rotating columns to be the same, and only by rotating the right rotating column can the angle or height of the well cover be adjusted, improving the installation efficiency and speed of the inspection well cover and reducing the operation steps of the staff.

[0017] Thirdly, the present invention is provided with an alignment component. After the staff pre-controls the observation plate to be parallel to the steel wire slope, the up and down displacement distances of the screws on the left and right sides can be controlled, so that the well cover is parallel to the steel wire slope, reducing the operation steps for adjusting the slope of the well cover and improving the installation efficiency and speed of the inspection well cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the adjustable inspection well cover of the present invention; Figure 2 is a schematic connection structure diagram of the support component of the present invention; Figure 3 is a top plan view of the internal structure of the annular base of the present invention; Figure 4 is Figure 3 the enlarged view at A in Figure 5 is a side plan view of the linkage component of the present invention; Figure 6 Front elevation plan view of the conversion drive assembly of the present invention; Figure 7 Front elevation plan view of the internal structure of the first shaft and the third shaft of the present invention; Figure 8 is Figure 7 Enlarged view at position B in

[0019] In the figure: 1, manhole cover; 2, annular base; 3, support assembly; 31, rotating column; 32, screw; 33, mounting plate; 34, connecting shaft; 4, alignment assembly; 41, observation plate; 42, worm; 43, transmission shaft; 44, worm gear; 45, transmission cavity; 46, cam; 47, mounting plate; 48, mounting slide bar; 49, limit plate; 410, first spring; 411, positioning plate; 412, stop block; 413, push rod; 414, extrusion rod; 415, rotating plate; 5, synchronization assembly; 51, synchronization ring; 52, first gear; 53, arc support seat; 54, transmission tooth groove; 55, conversion drive assembly; 551, synchronization gear; 552, asynchronous gear; 553, conversion housing; 554, first shaft; 555, movable shaft; 556, movable groove; 557, limiting tooth groove; 558, contraction groove; 559, limiting tooth block; 5510, second spring; 5511, second shaft; 5512, third shaft; 5513, sprocket; 5514, chain; 5515, limiting slide groove; 5516, limiting slider; 5517, sleeved ring; 5518, T-shaped contact rod; 5519, hinge plate; 5520, tension spring; 5521, extrusion block; 56, second gear; 57, connecting slider; 58, pulley; 6, linkage assembly; 61, arc plate; 62, limit slide bar; 63, connecting plate; 64, swing plate; 65, sleeved shaft; 66, rotating push plate. Detailed implementation manners

[0020] The following further elaborates the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant invention and are not intended to limit the invention. Additionally, it should be noted that for the sake of description, only parts related to the invention are shown in the drawings.

[0021] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will elaborate on the present application in detail with reference to the drawings and embodiments.

[0022] The present invention provides the following technical solutions: Specifically, it refers to a construction method for seamless connection between inspection well covers and asphalt pavements. The specific operation steps include S1. Excavation and leveling of the original pavement S1-1. Before excavation, conduct on-site inspections of each inspection well to clarify the routing and burial depth of underground pipelines; S1-2. Demolish and excavate the original road to the roadbed to reach the designed elevation and slope; S1-3. At the same time, lower the elevation of the inspection well opening to the designed elevation of the roadbed and make it on the same plane as the roadbed; S1-4. Use a roller to repeatedly roll the roadbed and conduct a deflection test on the subgrade bottom layer (generally about 30 MPa) until the design requirements are met; S1-5. Select a Q345B manganese steel plate with a thickness of δ = 10 mm and a diameter 1.3 times the well opening diameter to lay on the well opening for protection, making it ready for the paving of the water-stable layer; S2. Paving of the water-stable layer The water-stable base layer is preferably paved in layers by a paver. If there are too many obstacles and it is not feasible, manual cooperation with excavators and loaders can be used for paving. When paving the top layer of the water-stable base layer, a screed should be used to level it, ensuring that the unevenness is not greater than 1%. After the base layer paving is completed, at the position of the protective steel plate of the well opening, chisel the water-stable base layer and remove the protective steel plate; S3. Raising the well S3-1. Thoroughly clean the water-stable base layer gravel on the well opening surface to expose the top surface of the well opening; S3-2. Build the well to a position 200 mm below the elevation of the water-stable base layer, ensuring that each layer of bricks is laid flat and the mortar joints are full, avoiding phenomena such as hollowing and cracking; S3-3. At the same time, install rainwater and sewage branch pipes according to the requirements of the drawing design. The pipe diameter, direction, and elevation should meet the design requirements. The connection between the pipe and the well wall should be tight. After the well is built, use a spirit level to check to ensure the flatness of the well opening; S4. Installation of the anti-settlement slab To ensure that the area around the well opening does not collapse, cut out a square pit with a length of 2 m × width of 2 m and a depth of 200 mm around the well opening, then lift and place the pre-bound steel mesh, and then carry out pouring; prefabricated anti-settlement slabs can also be used. Regardless of the method used, the upper plane elevation of the anti-settlement slab should be on the same reference plane as the elevation of the water-stable base layer; S5. Paving of the bottom asphalt layer Before installing the well cover, pave it in two layers according to the requirements of the drawing design. Before paving the bottom asphalt layer, use the steel plate described above to protect the well opening. After the bottom layer of asphalt is paved and rolled by a rubber-tyred roller, use a portable electric cutting machine to cut out a circular contour 50 - 100 mm larger than its diameter along the edge of the protective steel plate and remove the steel plate; S6. Installation of the well cover S6-1. In the direction of the road extension line, mark the elevation of the asphalt surface layer (after compaction) on the roadside of the road on the curb according to the design requirements; calculate the elevation of the asphalt surface layer at the position of the road center line according to the designed transverse slope of the road (temporarily 1%), and mark it on the scale. After the manhole cover is in place, hang a steel wire between the two points, and find the reference line for the installation elevation of the manhole cover at the wellhead; S6-2. Before the manhole cover is in place, through careful adjustment of the adjustable inspection manhole cover, make the elevation and slope of the manhole cover consistent with the elevation and slope of the steel wire. At the same time, use a spirit level to ensure the flatness in the direction of the road extension line until the installation error of the manhole cover is within the range required by the drawing; S6-3. Install a circular formwork on the outer edge of the manhole cover. The outer diameter of the formwork is 50-80 mm larger than the diameter of the manhole cover, and the height is slightly higher than the manhole cover by 30-50 mm. Fill and compact the gap between the wellhead and the manhole cover with rubber and plastic sponge, and then fill it with dry-mixed mortar stirred with water to prevent omission after pouring the quick-setting cement; S6-4. Finally, pour and vibrate the quick-setting cement (also known as inspection well reinforcement concrete) until it is dense. In particular, vibrate thoroughly under the outer edge of the manhole cover and at the connection between the manhole cover and the wellhead, and check carefully. The outer formwork can be removed after two hours, and the concrete under the outer edge of the manhole cover is trimmed to be flush with the periphery of the manhole cover; S7. Asphalt pavement surface course paving After the installation of the manhole cover is completed and the asphalt surface course paving can be carried out, use a paver and a wheeled roller to carry out the paving and rolling of the asphalt surface layer. During the paving and rolling process, in addition to paying close attention to the height difference between the manhole cover and the asphalt surface layer, local manual cooperation should also be noted to ensure seamless and flat connection between the manhole cover and the asphalt surface layer.

[0023] Please refer to Figures 1-8 , the present invention provides another new technical solution according to the above scheme: an adjustable inspection manhole cover, including a manhole cover 1, an annular base 2, and four support components 3 arranged between the manhole cover 1 and the annular base 2. The four support components 3 are arranged between the manhole cover 1 and the annular base 2 in a circumferential array manner.

[0024] The support component 3 includes a rotating column 31 which is rotatably connected to the annular base 2. The upper surface of the rotating column 31 is provided with a screw rod 32. A threaded groove is formed on the upper surface of the rotating column 31. The lower end of the screw rod 32 extends into the threaded groove and is threadedly connected to the threaded groove. The upper end of the screw rod 32 is hinged with a mounting plate 33. The mounting plate 33 is detachably mounted on the lower surface of the manhole cover 1. The mounting plate 33 and the manhole cover 1 are fixed by bolts. During use, by rotating the rotating column 31, since the top of the screw rod 32 is restricted by the mounting plate 33 and cannot rotate, the screw rod 32 is displaced upward or downward under the transmission of the threaded groove. Therefore, the manhole cover is displaced upward or downward synchronously. At the same time, when adjusting the inclination angle of the manhole cover, only one of the screw rods 32 needs to be controlled to move upward or downward, while the screw rod 32 at the relative position moves in the opposite direction, and the other two remain stationary, so as to achieve the purpose of adjusting the inclination angle of the manhole cover, making the elevation and slope of the manhole cover consistent with the elevation and slope of the steel wire.

[0025] The inside of the annular base 2 is hollow. An alignment component 4 is arranged on the outer surface of the annular base 2. A synchronization component 5 is arranged inside the annular base 2. The synchronization component 5 includes a synchronization ring 51 which is arranged inside the annular base 2. Four arc-shaped support seats 53 arranged in a circumferential array are arranged on the bottom wall of the annular base 2. A chute (not shown in the figure) is formed on the upper surface of the arc-shaped support seat 53. A connecting slider 57 which slides in the chute is arranged on the lower surface of the synchronization ring 51. A connecting shaft 34 is arranged on the lower surface of the right rotating column 31. The lower end of the connecting shaft 34 rotatably penetrates into the annular base 2. A first gear 52 located inside the synchronization ring 51 is arranged at the lower end of the connecting shaft 34. Connecting shafts 34 with their lower ends movably penetrating into the annular base 2 are also arranged on the lower surfaces of the front and rear rotating columns 31. Second gears 56 located inside the synchronization ring 51 are arranged at the lower ends of the front and rear connecting shafts 34. Transmission tooth grooves 54 which are meshed with the first gear 52 and the second gear 56 are formed on the inner side surfaces of the synchronization ring 51 close to the first gear 52 and the second gear 56. A conversion transmission component 55 connected to the left rotating column 31 is arranged on the left side of the synchronization ring 51.

[0026] During use, when the right rotating column 31 is rotated, the synchronization ring 51 can be driven to rotate by meshing, so that the other three rotating columns 31 can rotate synchronously, thereby controlling the upward or downward displacement of the manhole cover 1.

[0027] A pulley 58 which contacts the bottom wall of the chute is arranged on the lower surface of the connecting slider 57, reducing the friction when the connecting slider 57 slides in the chute and ensuring the smoothness of the sliding of the synchronization ring 51.

[0028] The alignment component 4 includes an observation plate 41. The observation plate 41 is arranged on the front side of the annular base 2. A transmission shaft 43 is arranged on the rear side surface of the observation plate 41. The rear end of the transmission shaft 43 rotatably penetrates into the annular base 2. A transmission cavity 45 sleeving the outer surface of the transmission shaft 43 is formed on the front side of the annular base 2. A worm gear 44 is sleeved on the outer surface of the transmission shaft 43 located in the transmission cavity 45. A worm 42 is meshed and connected to the outer surface of the worm gear 44. The upper end of the worm 42 rotatably penetrates out of the upper surface of the annular base 2. A handle is arranged on the upper surface of the worm 42.

[0029] During use, when the handle is rotated, the worm 42 rotates synchronously with the handle. At this time, the worm 42 meshes and drives the worm gear 44 to rotate, so that the transmission shaft 43 drives the observation plate 41 to tilt synchronously. Therefore, before the inclination angle of the manhole cover needs to be adjusted, first rotate the inclination angle of the observation plate 41 so that the inclination angle of the observation plate 41 is parallel to the slope of the steel wire. At the same time, the observation plate 41 adjusts the inclination angle by means of worm and worm gear transmission, ensuring the accuracy of the angle adjustment of the observation plate 41, and the worm and worm gear have a self-locking effect, which can prevent the transmission shaft 43 from rotating automatically.

[0030] A linkage component 6 is arranged between the front and rear second gears 56. The linkage component 6 includes an arc plate 61. The arc plate 61 is arranged in the annular base 2. A connecting plate 63 is arranged on the outer surface of the arc plate 61 close to the second gear 56. The bottom of the second gear 56 is rotatably connected to the connecting plate 63. One end of the transmission shaft 43 located in the annular base 2 is provided with a swing plate 64. A sleeve shaft 65 is arranged on the side of the swing plate 64 away from the transmission shaft 43. A rotating push plate 66 is rotatably sleeved on the outer surface of the sleeve shaft 65. The upper side of the rotating push plate 66 is hinged to the lower side of the connecting plate 63.

[0031] During use, when the observation plate 41 rotates and tilts, the swing plate 64 rotates synchronously with the transmission shaft 43, so that the sleeve shaft 65 will exert a thrust on the rotating push plate 66. At this time, the rotating push plate 66 synchronously pushes the connecting plate 63 to move upward, and at the same time the second gear 56 moves upward and gets out of gear. Therefore, when the manhole cover adjusts the inclination angle, the front and rear two screw rods 32 remain stationary, and at this time it will not affect the adjustment of the inclination angle of the manhole cover.

[0032] A plurality of limiting slide rods 62 are arranged between the inner walls of the upper and lower sides of the annular base 2. The arc plate 61 is slidably sleeved on the outer surface of the limiting slide rods 62. During use, the limiting slide rods 62 form a limiting effect on the arc plate 61, preventing the arc plate 61 from tilting and ensuring the synchronism of the up and down displacement of the front and rear two second gears 56.

[0033] The conversion drive assembly 55 includes a synchronous gear 551 and an asynchronous gear 552. The synchronous gear 551 and the asynchronous gear 552 are symmetrically arranged on the inner and outer sides of the synchronous ring 51 respectively. And on the surfaces of the synchronous ring 51 close to the synchronous gear 551 and the asynchronous gear 552, there are drive tooth grooves 54 meshed with the synchronous gear 551 and the asynchronous gear 552. When the synchronous ring 51 rotates, the synchronous gear 551 rotates in the same direction as the first gear 52 and the second gear 56, while the asynchronous gear 552 rotates in the opposite direction.

[0034] On the top wall on the left side of the annular base 2, there is a conversion housing 553. On the upper surface of the synchronous gear 551, there is a first shaft 554. The upper surface of the first shaft 554 rotatably penetrates into the bottom wall of the conversion housing 553. The upper end of the first shaft 554 is rotatably connected to a third shaft 5512. On the upper surfaces of the third shaft 5512 and the first shaft 554, there are mutually communicating activity grooves 556. On the lower surface of the left rotating column 31, there is an activity shaft 555. The lower end of the activity shaft 555 movably penetrates into the conversion housing 553. The lower end of the activity shaft 555 can extend into the activity groove 556 of the first shaft 554 through the activity groove 556 of the third shaft 5512. On the inner walls of the two activity grooves 556, there are a plurality of limiting tooth grooves 557 arranged in a circumferential array. The shape of the limiting tooth groove 557 is a horizontal isosceles triangle. On the outer surface of the lower end of the activity shaft 555, there are a plurality of shrinkage grooves 558 arranged in a circumferential array. A limiting tooth block 559 is slidably connected in the shrinkage groove 558. One side of the limiting tooth block 559 extends out of the outer surface of the activity shaft 555 and fits with the limiting tooth groove 557. A second spring 5510 is arranged between the limiting tooth block 559 and the inner wall of the shrinkage groove 558.

[0035] During use, when the lower end of the activity shaft 555 extends into the activity groove 556 of the first shaft 554, at this time, the limiting tooth block 559 at the bottom of the activity shaft 555 is clamped into the limiting tooth groove 557. Therefore, when the synchronous gear 551 rotates, the first shaft 554 can drive the activity shaft 555 to rotate synchronously. At this time, the rotating columns 31 on the left and right rotate in the same direction. Therefore, the manhole cover 1 can be driven to displace in the vertical direction. When the activity shaft 555 displaces upward, since the limiting tooth groove 557 is a horizontal isosceles triangle, the limiting tooth block 559 is squeezed by the inclined surface of the limiting tooth groove 557, so that the limiting tooth block 559 gradually shrinks into the shrinkage groove 558, and the second spring 5510 is stressed and deformed. When the lower end of the activity shaft 555 displaces into the activity groove 556 of the third shaft 5512, the limiting tooth block 559 is clamped into the limiting tooth groove 557 of the third shaft 5512 under the push of the second spring 5510. Therefore, the activity shaft 555 can rotate synchronously with the third shaft 5512.

[0036] The upper surface of the asynchronous gear 552 is provided with a second shaft 5511. The upper end of the second shaft 5511 rotates through the conversion housing 553. Two sprockets 5513 are sleeved on the outer surfaces of the upper end of the second shaft 5511 and the third shaft 5512. A chain 5514 is connected between the two sprockets 5513. During use, the third shaft 5512 rotates in the same direction as the asynchronous gear 552. Therefore, when the lower end of the movable shaft 555 extends into the movable slot 556 of the third shaft 5512, the movable shaft 555 rotates synchronously with the asynchronous gear 552. As a result, the vertical displacement directions of the left and right screws 32 are opposite, so that the inclination angle of the manhole cover 1 can be adjusted.

[0037] A sleeve ring 5517 is rotatably sleeved on the outer surface of the movable shaft 555. A hinge plate 5519 is hinged on the outer surface of the sleeve ring 5517. A T-shaped contact rod 5518 is hinged on the lower side of the hinge plate 5519. One end of the cross bar of the T-shaped contact rod 5518 slides through the outer surface of the conversion housing 553. A tension spring 5520 is arranged between the vertical plate of the T-shaped contact rod 5518 and the inner wall of the conversion housing 553 and is movably sleeved on the outer surface of the cross bar. When the tension spring 5520 is not pulled, the tension spring 5520 will form a pulling force on the T-shaped contact rod 5518, so that the hinge plate 5519 pulls the lower end of the movable shaft 555 to extend into the movable slot 556 of the first shaft 554. An extrusion block 5521 is arranged on the upper surface of the arc-shaped plate 61. An inclined surface is arranged on the upper side of the extrusion block 5521. One end of the T-shaped contact rod 5518 located outside the conversion housing 553 contacts and slides on the inclined surface of the extrusion block 5521.

[0038] When the arc-shaped plate 61 moves upward, the inclined surface of the extrusion block 5521 extrudes the T-shaped contact rod 5518, causing the T-shaped contact rod 5518 to form a thrust on the hinge plate 5519. At this time, the hinge plate 5519 pushes the movable shaft 555 upward, causing the lower end of the movable shaft 555 to displace into the movable groove 556 of the third shaft 5512, so that the rotation directions of the left and right rotating columns 31 are opposite. Therefore, the inclination angle of the manhole cover 1 can be adjusted. When the vertical position of the manhole cover 1 needs to be adjusted, first rotate the observation plate 41 to be horizontal. At this time, the arc-shaped plate 61 moves downward and drives the front and rear second gears 56 to engage with the transmission tooth grooves 54 of the synchronous ring 51. At the same time, the extrusion block 5521 no longer extrudes the T-shaped contact rod 5518. At this time, the tension spring 5520 pulls the lower end of the movable shaft 555 to displace into the movable groove 556 of the first shaft 554, so that the rotation directions of the four rotating columns 31 are the same. Through the above structure, when adjusting the inclination angle of the manhole cover 1, the rotation directions of the left and right rotating columns 31 can be automatically controlled to be opposite, and the other two rotating columns 31 remain stationary. When adjusting the vertical direction of the manhole cover 1, the rotation directions of the four rotating columns 31 can be automatically controlled to be the same, and only the right rotating column 31 needs to be rotated to complete the adjustment of the angle or height of the manhole cover 1, improving the installation efficiency and speed of the inspection manhole cover and reducing the operation steps of the staff.

[0039] A limiting sliding groove 5515 is opened at the bottom of the left rotating column 31. The upper end of the movable shaft 555 slides through the limiting sliding groove 5515. A limiting sliding block 5516 that slides in the limiting sliding groove 5515 is arranged at the upper end of the movable shaft 555. Therefore, when the movable shaft 555 moves up and down, the limiting sliding block 5516 slides in the limiting sliding groove 5515, and the limiting sliding block 5516 only slides in the limiting sliding groove 5515. Therefore, the movable shaft 555 can drive the left rotating column 31 to rotate through the limiting sliding block 5516. At the same time, since the front and rear second gears 56 need to move up and down, limiting sliding grooves 5515 are also opened at the bottoms of the front and rear rotating columns 31. The upper ends of the front and rear connecting shafts 34 slide through the limiting sliding grooves 5515 and are also provided with limiting sliding blocks 5516. Therefore, while not affecting the up and down displacement of the second gears 56, the transmission of the rotating columns 31 is ensured.

[0040] On the inner wall of the annular base 2 close to the transmission shaft 43, four mounting plates 47 are provided. The four mounting plates 47 are arranged in parallel in groups of two on the inner wall of the annular base 2, and the two groups of mounting plates 47 are located on the left and right sides of the transmission shaft 43. An installation slide rod 48 is arranged between the two mounting plates 47. A limiting plate 49 is slidably sleeved on the outer surface of the installation slide rod 48. A first spring 410 is movably sleeved on the outer surface of the installation slide rod 48 between the surface of the limiting plate 49 facing away from the transmission shaft 43 and the mounting plate 47. A cam 46 in contact with the limiting plate 49 is sleeved on the outer surface of the transmission shaft 43. When the transmission shaft 43 rotates, the cam 46 will exert a thrust on the limiting plate 49, causing the limiting plate 49 to displace to the side away from the transmission shaft 43. At the same time, the first spring 410 is stressed and contracts.

[0041] A stop block 412 is arranged on the side of the limiting plate 49 facing the synchronizing ring 51. A push rod 413 is arranged on the surface of the stop block 412 close to the limiting plate 49. The inside of the limiting plate 49 is hollow. The other end of the push rod 413 slides through the inside of the limiting plate 49. An extrusion rod 414 is arranged inside the limiting plate 49. One end of the extrusion rod 414 slides out of the limiting plate 49 and contacts the outer surface of the cam 46. A rotating plate 415 is hinged between the extrusion rod 414 and the push rod 413. A tension spring 5520 is also arranged between the stop block 412 and the limiting plate 49. A positioning plate 411 is arranged on the outer surface of the synchronizing ring 51 facing the transmission shaft 43. The positioning plate 411 can contact the stop block 412.

[0042] During use, when the observation plate 41 rotates to be parallel to the slope of the steel wire, the rotation of the cam 46 will exert a thrust on the extrusion rod 414. At this time, the rotating plate 415 will exert a thrust on the push rod 413, causing the push rod 413 to push the stop block 412 to displace to the side away from the limiting plate 49. When the rotation angle of the cam 46 is relatively large, the extrusion rod 414 cannot displace. Thus, the cam 46 can push the limiting plate 49 to displace. When the synchronizing ring 51 rotates, the positioning plate 411 will rotate synchronously with the synchronizing ring 51. When the positioning plate 411 contacts the stop block 412, the synchronizing ring 51 cannot rotate, and the rotating columns 31 on both sides cannot rotate. Therefore, it can achieve the control that the manhole cover 1 is parallel to the slope of the steel wire, eliminating the need for workers to align the manhole cover 1 with the slope of the steel wire again, reducing the operation steps for adjusting the slope of the manhole cover 1, and improving the installation efficiency and speed of the inspection manhole cover. After the manhole cover 1 is parallel to the slope of the steel wire, the observation plate 41 rotates to a horizontal state, the cam 46 no longer exerts extrusion, and the limiting plate 49 displaces back to the initial position under the push of the first spring 410. At the same time, the stop block 412 displaces to the side of the limiting plate 49 under the pull of the tension spring 5520, and at this time, it will not affect the rotation of the synchronizing ring 51.

[0043] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A construction method for seamless connection between inspection well covers and asphalt pavements, characterized in that: The operation steps are as follows: S1. Excavate and level the original road surface, and then lay a Q345B manganese steel plate with a thickness of δ = 10 mm and a diameter 1.3 times that of the wellhead diameter on the wellhead; S2. Pave the water-stable layer The water-stable base course should be paved in layers by a paver. If there are too many obstacles and it is not feasible, manual paving in cooperation with excavators and loaders can be adopted. When paving the topmost layer of the water-stable base course, a screed should be used to level it, ensuring that the unevenness is not greater than 1%. After the base course paving is completed, at the position of the protective steel plate of the wellhead, chisel the water-stable base course and remove the protective steel plate; S3. Raise the well S3-1. Thoroughly clean the water-stable base course gravel on the wellhead surface to expose the wellhead top surface; S3-2. Build the well to a position 200 mm below the elevation of the water-stable base course, ensuring that each layer of bricks is laid flat and the mortar joints are full, avoiding phenomena such as hollowing and cracking; S3-3. At the same time, install the rainwater and sewage branch pipes according to the requirements of the drawing design. The pipe diameter, direction, and elevation should meet the design requirements. The connection between the pipe and the well wall should be tight. After the well is built, use a spirit level to check to ensure the flatness of the wellhead; S4. Install the anti-settlement slab To ensure that the area around the wellhead does not collapse, cut a square pit with a length of 2 m × width of 2 m and a depth of 200 mm around the wellhead, then lift and place the pre-bound steel mesh, and then carry out pouring; prefabricated anti-settlement slabs can also be used; regardless of the method used, the upper plane elevation of the anti-settlement slab should be on the same reference plane as the elevation of the water-stable base course; S5. Pave the bottom asphalt layer Before installing the manhole cover, pave it in two layers according to the requirements of the drawing design. Before paving the bottom asphalt layer, use the steel plate described above to protect the wellhead. After the bottom asphalt layer is paved and compacted by a rubber-tyred roller, use a portable electric cutting machine to cut out a circular contour 50 - 100 mm larger than its diameter along the edge of the protective steel plate and remove the steel plate; S6. Install the manhole cover S6-1. On the road extension direction, mark the elevation of the asphalt surface layer (after compaction) on the roadside curb according to the design requirements; calculate the elevation of the asphalt surface layer at the center line position of the road according to the designed cross slope of the road (temporarily 1%) and mark it on the scale. After the manhole cover is in place, hang a steel wire between two points to find the reference line for the installation elevation of the manhole cover at the wellhead; S6-2. Before the manhole cover is in place, carefully adjust the adjustable inspection manhole cover so that the elevation and slope of the manhole cover are consistent with the elevation and slope of the steel wire. At the same time, use a spirit level to ensure the flatness along the road extension direction until the installation error of the manhole cover is within the range required by the drawing; S6-3. Install a circular formwork on the outer edge of the manhole cover, with an outer diameter 50 - 80 mm larger than the diameter of the manhole cover and a height slightly higher than the manhole cover by 30 - 50 mm. Fill and compact the gap between the wellhead and the manhole cover with rubber and plastic sponge, and then fill it with dry-mixed mortar stirred with water to prevent omission after pouring the rapid-setting cement; S6-4. Finally, pour and vibrate the rapid-setting cement (also known as inspection well reinforcement concrete) until it is dense. In particular, vibrate thoroughly under the outer edge of the manhole cover and at the connection between the manhole cover and the wellhead, and check carefully. The outer formwork can be removed after two hours, and the concrete at the outer edge of the manhole cover should be chiseled to be flush with the periphery of the manhole cover; S7. Asphalt Pavement Surface Course Paving After the manhole covers are installed and the asphalt surface course paving is ready, a paver and a wheel roller are used for the paving and rolling of the asphalt surface course. During the paving and rolling process, not only should the height difference between the manhole covers and the asphalt surface course be closely monitored, but also local manual cooperation should be noted to ensure seamless and flat connection between the manhole covers and the asphalt surface course.

2. Adjustable inspection well cover, based on the construction method for seamless connection between the inspection well cover and the asphalt pavement described in claim 1, including a well cover (1), an annular base (2), and four support components (3) arranged between the well cover (1) and the annular base (2), characterized in that: The four support components (3) are arranged between the manhole cover (1) and the annular base (2) in a circumferential array. The support component (3) includes a rotating column (31). The rotating column (31) is rotatably connected to the annular base (2). A screw rod (32) is arranged on the upper surface of the rotating column (31). A threaded groove is formed on the upper surface of the rotating column (31). The lower end of the screw rod (32) extends into the threaded groove and is threadedly connected to the threaded groove. The upper end of the screw rod (32) is hinged with a mounting plate (33). The mounting plate (33) is detachably mounted on the lower surface of the manhole cover (1). The interior of the annular base (2) is hollow. An alignment component (4) is arranged on the outer surface of the annular base (2). A synchronization component (5) for controlling the simultaneous operation of the four rotating columns (31) is arranged inside the annular base (2).

3. The adjustable inspection well cover according to claim 2, wherein: The synchronization component (5) includes a synchronization ring (51). The synchronization ring (51) is arranged inside the annular base (2). Four arc-shaped support seats (53) arranged in a circumferential array are arranged on the bottom wall of the annular base (2). A sliding groove is formed on the upper surface of the arc-shaped support seat (53). A connecting slider (57) that slides in the sliding groove is arranged on the lower surface of the synchronization ring (51). A connecting shaft (34) is arranged on the lower surface of the right rotating column (31). The lower end of the connecting shaft (34) rotatably penetrates into the annular base (2). A first gear (52) located inside the synchronization ring (51) is arranged at the lower end of the connecting shaft (34). The lower surfaces of the front and rear two rotating columns (31) are also provided with two connecting shafts (34) whose lower ends movably penetrate into the annular base (2). Second gears (56) located inside the synchronization ring (51) are arranged at the lower ends of the front and rear two connecting shafts (34). Driving tooth grooves (54) meshing with the first gear (52) and the second gears (56) are formed on the inner side surfaces of the synchronization ring (51) close to the first gear (52) and the second gears (56). A conversion transmission component (55) connected to the left rotating column (31) is arranged on the left side of the synchronization ring (51). A linkage component (6) is arranged between the front and rear two second gears (56).

4. The adjustable inspection well cover according to claim 3, wherein: The alignment component (4) includes an observation plate (41). The observation plate (41) is arranged on the front side of the annular base (2). A transmission shaft (43) is arranged on the rear side surface of the observation plate (41). The rear end of the transmission shaft (43) rotatably penetrates into the annular base (2). A transmission cavity (45) sleeving the outer surface of the transmission shaft (43) is formed on the front side of the annular base (2). A worm gear (44) is sleeved on the outer surface of the transmission shaft (43) located inside the transmission cavity (45). A worm (42) is meshed with the outer surface of the worm gear (44). The upper end of the worm (42) rotatably penetrates out of the upper surface of the annular base (2). A handle is arranged on the upper surface of the worm (42).

5. The adjustable inspection well cover according to claim 4, characterized in that: The linkage component (6) includes an arc-shaped plate (61). The arc-shaped plate (61) is arranged inside the annular base (2). A connecting plate (63) is provided on the outer surface of the arc-shaped plate (61) close to the second gear (56). The bottom of the second gear (56) is rotatably connected to the connecting plate (63). One end of the transmission shaft (43) located inside the annular base (2) is provided with a swing plate (64). A sleeve shaft (65) is provided on the side of the swing plate (64) away from the transmission shaft (43). A rotating push plate (66) is rotatably sleeved on the outer surface of the sleeve shaft (65). The upper side of the rotating push plate (66) is hinged to the lower side of the connecting plate (63). A plurality of limiting slide rods (62) are arranged between the upper and lower inner walls of the annular base (2). The arc-shaped plate (61) is slidably sleeved on the outer surface of the limiting slide rods (62).

6. The adjustable inspection well cover according to claim 5, characterized in that: The conversion transmission component (55) includes a synchronous gear (551) and an asynchronous gear (552). The synchronous gear (551) and the asynchronous gear (552) are symmetrically arranged on the inner and outer sides of the synchronous ring (51) respectively. And transmission tooth grooves (54) engaged with the synchronous gear (551) and the asynchronous gear (552) are formed on the surfaces of the synchronous ring (51) close to the synchronous gear (551) and the asynchronous gear (552). A conversion housing (553) is arranged on the top wall on the left side of the annular base (2). A first shaft (554) is provided on the upper surface of the synchronous gear (551). The upper surface of the first shaft (554) rotatably penetrates into the bottom wall of the conversion housing (553). The upper end of the first shaft (554) is rotatably connected to a third shaft (5512). Activity grooves (556) communicating with each other are formed on the upper surfaces of the third shaft (5512) and the first shaft (554). An activity shaft (555) is provided on the lower surface of the left rotating column (31). The lower end of the activity shaft (555) movably penetrates into the conversion housing (553). The lower end of the activity shaft (555) can extend into the activity groove (556) of the first shaft (554) through the activity groove (556) of the third shaft (5512). A plurality of limiting tooth grooves (557) arranged in a circumferential array are formed on the inner walls of the two activity grooves (556). The shape of the limiting tooth grooves (557) is a horizontal isosceles triangle. A plurality of shrinkage grooves (558) arranged in a circumferential array are formed on the outer surface of the lower end of the activity shaft (555). A limiting tooth block (559) is slidably connected in the shrinkage groove (558). One side of the limiting tooth block (559) extends out of the outer surface of the activity shaft (555) and fits with the limiting tooth groove (557). A second spring (5510) is arranged between the limiting tooth block (559) and the inner wall of the shrinkage groove (558).

7. The adjustable inspection well cover according to claim 6, characterized in that: A second shaft (5511) is provided on the upper surface of the asynchronous gear (552). The upper end of the second shaft (5511) rotatably penetrates into the conversion housing (553). Two sprockets (5513) are sleeved on the outer surfaces of the upper end of the second shaft (5511) and the third shaft (5512). A chain (5514) is drivingly connected between the two sprockets (5513).

8. The adjustable inspection well cover according to claim 7, characterized in that: A sleeve ring (5517) is rotatably sleeved on the outer surface of the movable shaft (555). An articulated plate (5519) is articulated on the outer surface of the sleeve ring (5517). A T-shaped contact rod (5518) is articulated on the lower side of the articulated plate (5519). One end of the cross bar of the T-shaped contact rod (5518) slidably penetrates through the outer surface of the conversion housing (553). A tension spring (5520) which is movably sleeved on the outer surface of the cross bar is arranged between the vertical plate of the T-shaped contact rod (5518) and the inner wall of the conversion housing (553). An extrusion block (5521) is arranged on the upper surface of the arc-shaped plate (61). An inclined surface is arranged on the upper side of the extrusion block (5521). The end of the T-shaped contact rod (5518) located outside the conversion housing (553) contacts and slides on the inclined surface of the extrusion block (5521).

9. The adjustable inspection well cover according to claim 8, wherein: A limiting chute (5515) is opened at the bottom of the left rotating column (31). The upper end of the movable shaft (555) slidably penetrates into the limiting chute (5515). A limiting slider (5516) which slides in the limiting chute (5515) is arranged at the upper end of the movable shaft (555). Limiting chutes (5515) are also opened at the bottoms of the front and rear rotating columns (31). The upper ends of the front and rear connecting shafts (34) slidably penetrate into the limiting chutes (5515), and limiting sliders (5516) are also arranged.

10. The adjustable inspection well cover according to claim 9, characterized in that: Four mounting plates (47) are arranged on the inner wall of the annular base (2) close to the transmission shaft (43). The four mounting plates (47) are arranged in parallel in groups of two on the inner wall of the annular base (2), and the two groups of mounting plates (47) are located on the left and right sides of the transmission shaft (43). An installation slide bar (48) is arranged between the two mounting plates (47). A limiting plate (49) is slidably sleeved on the outer surface of the installation slide bar (48). A first spring (410) which is movably sleeved on the outer surface of the installation slide bar (48) is arranged between the surface of the limiting plate (49) facing away from the transmission shaft (43) and the mounting plate (47). A cam (46) which contacts the limiting plate (49) is sleeved on the outer surface of the transmission shaft (43). A stop block (412) is arranged on the side of the limiting plate (49) facing the synchronous ring (51). A push rod (413) is arranged on the surface of the stop block (412) close to the limiting plate (49). The inside of the limiting plate (49) is hollow. The other end of the push rod (413) slidably penetrates into the inside of the limiting plate (49). An extrusion rod (414) is arranged inside the limiting plate (49). One end of the extrusion rod (414) slidably penetrates out of the limiting plate (49) and contacts the outer surface of the cam (46). A rotating plate (415) is articulated between the extrusion rod (414) and the push rod (413). A tension spring (5520) is also arranged between the stop block (412) and the limiting plate (49). A positioning plate (411) is arranged on the outer surface of the synchronous ring (51) facing the transmission shaft (43), and the positioning plate (411) can contact the stop block (412).

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