An adjustable-lift drainage inspection well and its construction method

Abstract

This invention discloses an adjustable-height drainage inspection well and its construction method. The inspection well includes a manhole cover and a prefabricated manhole cylinder. Through a special design of threading the outer wall of a first circular iron barrel added to the lower part of a regular manhole cover and threading the inner wall of a third circular iron barrel pre-embedded in the first prefabricated manhole cylinder, the height of the inspection well can be freely adjusted and controlled after the manhole cover is installed on the manhole cylinder without the need for other masonry materials or procedures. This avoids the problems of difficult construction of the road surface water-stabilized layer and settlement around the inspection well caused by the manhole cylinder being too high or too low above the roadbed top, and ensures the compaction effect of the road base layer around the manhole cylinder. At the same time, by designing drainage strip holes, the manhole cover also has a drainage function, increasing the efficiency of the urban drainage system and enabling the municipal pipe network to play a better role in the use of municipal roads.

Description

Technical Field

[0001] This invention belongs to the technical field of inspection well equipment, and more specifically, relates to an adjustable and height-adjustable drainage inspection well and its construction method. Background Technology

[0002] Municipal pipeline projects play multiple crucial roles in cities. First, they solve the problem of centralized discharge of rainwater and sewage, improving the efficiency of urban drainage systems and reducing urban flooding and pollution incidents. Second, municipal pipeline projects are of great significance to urban planning, providing a fundamental guarantee for the construction of urban roads, buildings, and green spaces, which is conducive to optimizing urban spatial layout and improving urban functions. Furthermore, municipal pipeline projects also have a positive effect on enhancing the city's image. Well-developed pipeline facilities and a clean urban environment help improve the quality of life and happiness of citizens, while also attracting more investors and tourists, thereby promoting urban economic development.

[0003] In daily life, whether driving on newly built roads or old roads, it is common to find manhole covers and their surrounding areas sinking to varying degrees. This not only poses a threat to the use of municipal pipelines and driving safety, but also significantly reduces the comfort of using municipal roads. There are several existing methods for constructing manholes: Method 1 uses a cast-in-place reinforced concrete manhole casing combined with the manhole cover; Method 2 uses a precast reinforced concrete manhole casing combined with mortar and small bricks to adjust the manhole cover; Method 3 uses a combination of precast and cast-in-place manhole casings combined with mortar and small bricks to adjust the manhole cover. Each of these conventional methods has its advantages and disadvantages. Method 1 has the advantage of good integrity of the cast-in-place well shaft, but the disadvantage is that each section of the well shaft requires processes such as tying reinforcing bars, setting up formwork, pouring concrete, and demolding, resulting in many construction steps and a long construction period. Method 2 has the advantage of fast construction speed of precast well shaft, but the disadvantage is that small bricks and mortar are needed to adjust between the precast well shaft and the well cover, which can easily lead to subsidence in and around the well cover. Method 3 has the advantages of fast construction speed and good integrity, but the disadvantage is that small bricks and mortar are needed to adjust between the precast well shaft and the well cover, which can easily lead to subsidence in and around the well cover.

[0004] During extreme weather events such as heavy rain and storms, low-lying areas of municipal roads are prone to flooding, necessitating rapid drainage. Traditionally, this involves opening manhole covers, but this has several drawbacks: 1. Locating manhole covers in floodwater is extremely difficult; 2. Opening manhole covers requires specialized tools; 3. Manhole covers are equipped with anti-theft locks, requiring special keys to open. Therefore, there is an urgent need for a type of inspection manhole that allows for rapid drainage without opening the cover during flooding. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides an adjustable-height drainage inspection well and its construction method. Through a special design involving threading the outer wall of a first circular iron barrel added to the lower part of a standard manhole cover and threading the inner wall of a third circular iron barrel pre-embedded in a first prefabricated manhole cylinder, the height of the inspection well can be freely adjusted and controlled after the manhole cover is installed on the manhole cylinder without the need for other masonry materials or procedures. This avoids the difficulties in constructing the pavement water-stabilized layer and the problem of settlement around the inspection well caused by the manhole cylinder being too high or too low above the roadbed top, ensuring the compaction effect of the pavement base layer around the manhole cylinder. Simultaneously, by designing drainage strip holes, the manhole cover also serves a drainage function, increasing the efficiency of the urban drainage system and enabling the municipal pipe network to better fulfill its role in the use of municipal roads.

[0006] To achieve the above objectives, the present invention provides an adjustable-lift drainage inspection well, comprising a well cover and a prefabricated well shaft, wherein...

[0007] The prefabricated manhole includes a second prefabricated manhole, a third prefabricated manhole, a second circular iron barrel, and a third circular iron barrel for adjusting the raising and lowering of the manhole cover; the second prefabricated manhole and multiple sets of the third prefabricated manholes are assembled and matched to control the distance from the top surface of the prefabricated manhole to the roadbed and / or the top surface of the road surface to ensure the road surface compaction effect; the inner wall of the third circular iron barrel is designed with threaded inner wall; permeable concrete is provided between the second circular iron barrel and the manhole cover, which not only fixes the manhole cover, but also prevents the drainage holes of the manhole cover from being blocked while cooperating with the drainage of the manhole cover;

[0008] The manhole cover includes a first circular iron barrel, the top of which has multiple symmetrical strip-shaped holes, and the outer wall is threaded. The height difference between the manhole cover and the road surface is controlled by the cooperation of the first circular iron barrel and the third circular iron barrel. The strip-shaped holes enable the manhole cover to also perform drainage functions, thereby increasing the efficiency of the urban drainage system.

[0009] Furthermore, the manhole cover includes a regular manhole cover, the lower end of which is provided with a wider manhole cover base plate.

[0010] Furthermore, the first circular iron bucket is fixedly disposed at the lower part of the manhole cover base plate.

[0011] Furthermore, the manhole cover includes a handrail, which is fixedly disposed on the outside of the manhole cover base plate; the handrail includes a rotatable arc-shaped iron ring; the rotation of the manhole cover is controlled by inserting a round tube into a plurality of the arc-shaped iron rings.

[0012] Furthermore, the prefabricated well casing includes a first prefabricated well casing and a fourth prefabricated well casing.

[0013] Furthermore, the first prefabricated wellbore has a flat top and a tongue-and-groove bottom; the second, third, and fourth prefabricated wellbores also have tongue-and-groove tops and tongue-and-groove bottoms.

[0014] Furthermore, the heights of the first and third prefabricated well shafts are the same as the designed water-stabilized layer height; the height of the second prefabricated well shaft is 10cm; and the fourth prefabricated well shaft is a standard section with a height of 72cm.

[0015] Furthermore, the first prefabricated well shaft includes a circular iron ring and embedded parts; one end of the circular iron ring is fixedly connected to the second circular iron barrel, and the other end is fixedly connected to the third circular iron barrel.

[0016] Furthermore, the third layer of asphalt laid on top of the permeable concrete is permeable asphalt.

[0017] Another aspect of the present invention provides a method for constructing an adjustable-lift drainage inspection well, which is implemented using the inspection well described above, and includes the following steps:

[0018] S1. Before construction, prepare a construction plan based on the design drawings and actual site conditions; check whether equipment such as road rollers, bulldozers and water pumps are in good condition and ensure normal operation of the equipment; manufacture adjustable and lifting drainage well covers and prefabricated well cylinders according to the design plan.

[0019] S2. After the manhole chamber is completed, the fourth precast standard section of the manhole is installed at the reserved opening of the manhole chamber. The installation of the fourth precast manhole is carried out alternately with the backfilling and compaction of earthwork until the installation of the standard section is stopped when the distance from the top surface of the design roadbed is less than one standard section height.

[0020] S3. When installing the second and third precast manholes, calculate the distance between the top surface elevation of the last installed standard section and the top surface elevation of the subgrade. If the distance is 1-4cm, select one section of the second precast manhole; if the distance is 5-10cm, select one section of the second precast manhole; if the distance is 11-71cm, use the 1-10cm selection method as a reference and select multiple sections of the second and third precast manholes. Backfill the earthwork and compact the entire subgrade area, including the area around the precast manholes, using a road roller.

[0021] S4. If the distance between the top surface of the precast well and the top surface of the first water-stabilized layer is 1-4cm, the height of the well does not need to be increased further; if the distance between the top surface of the precast well and the top surface of the first water-stabilized layer is 5-10cm, a second precast well section should be installed; after the first water-stabilized layer is laid, the entire water-stabilized layer area, including the area around the well, should be compacted using a road roller.

[0022] S5. Repeat step S4 to pave and compact the second water-stabilized layer;

[0023] S6. Install a section of the first precast well shaft and install the well cover on the first precast well shaft; lay the third water-stabilized layer and compact the entire water-stabilized layer, including the area around the well shaft, using a road roller;

[0024] S7. Insert the round tube into the symmetrical handrail of the manhole cover, and adjust it by turning it clockwise to lower and counterclockwise to raise, until the manhole cover is level with the road surface.

[0025] S8. Pour permeable concrete between the manhole cover and the second circular iron barrel, and control the elevation of the permeable concrete to the bottom elevation of the third layer of asphalt.

[0026] S9. On the road, excluding manholes, the first layer of asphalt and the second layer of asphalt concrete are laid and compacted in layers; the third layer of asphalt is laid and compacted, including the permeable concrete portion around the manhole covers.

[0027] S10. After construction is completed, the inspection well shall be inspected and accepted.

[0028] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0029] 1. The manhole of the present invention, through a special design of threading the outer wall of the first circular iron barrel added to the lower part of the ordinary manhole cover and threading the inner wall of the third circular iron barrel pre-embedded in the first prefabricated manhole cylinder, enables the height of the manhole to be freely adjusted and controlled after the manhole cover is installed on the manhole cylinder without the need for other masonry materials or procedures. This avoids the problems of difficult construction of the road water-stabilized layer and settlement around the manhole caused by the manhole cylinder being too high or too low above the roadbed top, and ensures the compaction effect of the road base around the manhole cylinder. At the same time, by designing drainage strip holes, the manhole cover also has a drainage function, increasing the efficiency of the urban drainage system and enabling the municipal pipe network to play a better role in the use of municipal roads.

[0030] 2. The inspection well of the present invention, through the design of a first circular iron barrel, a circular iron ring pre-embedded on the first prefabricated well barrel, and a second circular iron barrel welded to the upper part of the circular iron ring, forms a space between the well barrel and the well cover. After pouring permeable concrete and permeable asphalt into this space, the well cover has its own drainage function in conjunction with the strip hole at the upper end of the first circular iron barrel.

[0031] 3. The inspection well of the present invention solves the problem of fixing the manhole cover by pouring permeable concrete and laying permeable asphalt. It also avoids the blockage of the manhole cover drainage holes while cooperating with the drainage of the manhole cover. This not only improves the service life of the manhole cover, but also reduces the cost of maintenance and upkeep, and has a positive promoting effect on urban rainwater management and flood control.

[0032] 4. The manhole of the present invention, through the design of the fourth prefabricated manhole, can ensure that the manhole below the roadbed is at a height higher than the layered backfill soil, thus ensuring the compaction effect of the roadbed around the manhole and avoiding settlement around the manhole cover.

[0033] 5. The manhole of the present invention, through the design of the second precast manhole and the third precast manhole for adjustment, realizes the adjustment of the height of the manhole between the subgrade and the road base layer, so that the manhole is always slightly higher than the water-stabilized layer, ensuring the compaction effect of the road base layer around the manhole and avoiding settlement around the manhole cover. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the inspection well according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the adjustable lifting drainage manhole cover according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the manhole cover handrail according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the first prefabricated well casing according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the construction method of the inspection well according to an embodiment of the present invention.

[0039] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 110-Ordinary manhole cover, 120-Manhole cover base plate, 130-First circular iron barrel, 131-Strip-shaped hole, 140-Handrail, 141-Arc-shaped iron ring, 142-Strip-shaped iron sheet, 143-Arc-shaped iron sheet, 210-First prefabricated manhole casing, 211-Second circular iron barrel, 212-Circular iron ring, 213-Third circular iron barrel, 214 - Embedded parts, 220 - Second precast manhole, 230 - Third precast manhole, 240 - Fourth precast manhole, 310 - Layered backfill, 410 - Drainage pipe, 510 - Precast manhole, 610 - Roadbed top surface, 710 - First water-stabilized layer, 711 - Second water-stabilized layer, 712 - Third water-stabilized layer, 810 - First layer of asphalt, 811 - Second layer of asphalt, 812 - Third layer of asphalt, 910 - Permeable concrete. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figures 1 to 4 As shown, this embodiment of the invention provides an adjustable-lift drainage inspection well, including a manhole cover and a prefabricated manhole cylinder; wherein, the prefabricated manhole cylinder is located in a ground foundation pit; the manhole cover is rotatably connected to the prefabricated manhole cylinder by threaded outer wall on its outer side and threaded inner wall on its inner side, and a strip-shaped hole 131 is also provided on its outer side; by constructing the underground part of the inspection well through multiple sets of the prefabricated manhole cylinders and adjusting its height difference with the roadbed, and by using a rotation method to raise and lower the manhole cover above the prefabricated manhole cylinder, the height of the inspection well can be freely adjusted and controlled without the need for other masonry materials or processes, avoiding the need for inspection... The design addresses the challenges of constructing water-stabilized road surfaces due to excessively high or low exposed manhole tops, as well as issues like settlement around manholes and the sinking of manhole covers after adjusting their height with small bricks and cement mortar. It ensures the compaction of the road base around the manhole and achieves precise control over the construction of prefabricated manholes and covers in municipal pipeline projects, avoiding difficulties in subsequent construction processes. Furthermore, the design incorporates drainage slots (131), allowing the manhole cover to also serve a drainage function, increasing the efficiency of the urban drainage system and enabling the municipal pipeline network to better fulfill its role in municipal road use.

[0042] like Figures 1 to 3 As shown, the manhole cover includes a standard manhole cover 110, a handrail 140, and a first circular iron bucket 130. The standard manhole cover 110 is circular, with a wider manhole cover base plate 120 at its lower end. Multiple symmetrical handrails 140 are fixedly mounted on the outer side of the manhole cover base plate 120. Each handrail 140 includes an arc-shaped iron ring 141, a strip iron sheet 142, and an arc-shaped iron sheet 143. The arc-shaped iron sheet 143 is fixedly mounted on the long side surface of the strip iron sheet 142. The arc-shaped iron ring 141 passes through the arc-shaped iron sheet 143 at both ends and can rotate 180° around its two ends. The strip iron sheet 142 is welded and fixed to the manhole cover base plate 130. 20 on both sides; the first circular iron barrel 130 is fixedly installed at the lower end of the manhole cover base plate 120; the upper end of the first circular iron barrel 130 is provided with a plurality of symmetrical strip holes 131, and the outer side is provided with outer wall threads; the outer wall threads of the first circular iron barrel 130 cooperate with the inner wall threads of the precast manhole barrel, and the manhole cover can be rotated by the handle 140 to control the height difference between the manhole cover and the road surface, avoiding the phenomenon of manhole cover sinking after adjusting the height of the manhole cover with small bricks and cement mortar, and ensuring the compaction effect of the road base around the inspection well; by designing drainage strip holes 131, the manhole cover can also serve the function of drainage, increasing the efficiency of the urban drainage system.

[0043] Preferably, the ordinary manhole cover 110 is made of ductile iron.

[0044] Preferably, the rotation of the manhole cover is controlled by inserting multiple arc-shaped iron rings 141 through a circular tube.

[0045] Preferably, the manhole cover is adjusted downwards by rotating clockwise and upwards by rotating counterclockwise.

[0046] like Figure 1 and Figure 4 As shown, the precast manhole includes a first precast manhole 210, a second precast manhole 220, a third precast manhole 230, and a fourth precast manhole 240. The fourth precast manhole 240 has an upper and lower tongue-and-groove joint, and its first section is installed in a reserved opening above the precast manhole chamber 510. Multiple sets of the fourth precast manhole 240 are assembled to a height difference of less than 72cm from the top surface 610 of the roadbed. The second precast manhole 220 has an upper and lower tongue-and-groove joint and is fixedly installed above the third precast manhole 230 or the fourth precast manhole 240. The third precast manhole 230 has an upper and lower tongue-and-groove joint and is fixedly installed above the second precast manhole 220 or the fourth precast manhole 240. The first precast manhole 210 has an upper flat opening and a lower tongue-and-groove joint and is fixedly installed above the third precast manhole 230. The 0 also includes a second circular iron barrel 211, a circular iron ring 212, a third circular iron barrel 213, and an embedded part 214; the circular iron ring 212 is fixedly installed on the upper part of the first precast manhole 210, and the lower end of the ring is provided with the vertical embedded part 214; the lower end of the second circular iron barrel 211 is fixedly connected to the circular iron ring 212; the upper end of the third circular iron barrel 213 is fixedly connected to the circular iron ring 212, one side of the ring is fixedly provided with the horizontal embedded part 214, and the other side is threaded on the inner wall; the inspection well is based on multiple fourth precast manholes 240, which are assembled and extended to near the top surface of the roadbed, and then multiple second precast manholes 220 and multiple third precast manholes 230 are used to make the precast manholes slightly higher than or flush with the top surface of the roadbed, so that the installation of the precast manholes does not affect the subsequent layered backfilling construction, thereby ensuring the compaction effect and construction quality of the road surface.

[0047] Preferably, the height of the second prefabricated wellbore 220 is 10cm.

[0048] Preferably, the heights of the first prefabricated wellbore 210 and the third prefabricated wellbore 230 are the same as the designed height of the water-stabilized layer.

[0049] Preferably, the fourth prefabricated wellbore 240 is a standard section with a height of 72cm.

[0050] Preferably, the gaps between the prefabricated well shafts are grouted with cement mortar.

[0051] Preferably, both the water-stabilized layer and the asphalt layer have three layers, wherein the third layer of asphalt 812 is a permeable asphalt layer.

[0052] like Figure 5As shown, another embodiment of the present invention provides a method for constructing an adjustable-lift drainage inspection well, comprising the following steps:

[0053] S1. Organize engineering and technical personnel to carefully study the design drawings, relevant technical regulations, specifications, and quality acceptance evaluation standards, understand the design intent, and ensure that construction is based on solid evidence; combine design drawings and actual site conditions to prepare construction plans and provide technical and safety briefings to the construction team; check the condition of equipment such as road rollers, bulldozers, and water pumps to ensure their normal operation; manufacture adjustable and lifting drainage well covers and prefabricated well cylinders according to the design plan; communicate and coordinate with relevant departments and units to ensure smooth construction.

[0054] S2. After the manhole chamber is completed, the fourth precast manhole cylinder 240 of the standard section is installed at the reserved opening of the manhole chamber. Then, the earthwork is backfilled and compacted. The installation of the fourth precast manhole cylinder 240, the earthwork backfilling and compaction are carried out alternately. The gaps between each section of the fourth precast manhole cylinder 240 are grouted with cement mortar until the installation of the standard section stops when the height of the standard section is less than one standard section from the top surface of the design roadbed.

[0055] After the installation of the fourth precast manhole 240 of the standard section is completed, when installing the second precast manhole 220 and the third precast manhole 230, calculate the distance between the top surface elevation of the last installed standard section and the top surface elevation of the roadbed. If the distance is 1-4cm, one section of the second precast manhole 220 can be selected. In this case, the precast manhole is higher than the top surface of the roadbed and slightly lower than the top surface of the water-stabilized layer. If the distance is 5-10cm, one section of the second precast manhole 220 is selected. In this case, the precast manhole is slightly higher than or flush with the top surface of the roadbed. If the distance is 11-71cm, using the 1-10cm selection method as a reference, multiple sections of the second precast manhole 220 and multiple sections of the third precast manhole 230 are selected to ensure that the precast manholes are slightly higher than or flush with the top surface of the roadbed after installation, so as to ensure the compaction effect of the road surface. Backfill the earthwork and compact the entire roadbed area, including the area around the precast manholes, using a road roller.

[0056] S4. If the distance between the top surface of the precast well shaft and the top surface of the first water-stabilized layer 710 is 1-4cm, the height of the well shaft does not need to be increased further; if the distance between the top surface of the precast well shaft and the top surface of the first water-stabilized layer 710 is 5-10cm, a second precast well shaft 220 should be installed, and cement mortar should be used to grout the joint; after the first water-stabilized layer 710 is laid, the entire water-stabilized layer area, including the area around the well shaft, should be compacted using a road roller.

[0057] S5. Repeat step S4 to pave and compact the second water-stabilized layer 711;

[0058] S6. After the second water-stabilized layer 711 of the road surface is completed, a section of the first precast well cylinder 210 is installed, and the adjustable and liftable drainage well cover is installed on the first precast well cylinder 210; the third water-stabilized layer 712 is laid, and the entire water-stabilized layer area, including the area around the well cylinder, is compacted using a road roller.

[0059] S7. Using the third circular iron barrel 213 pre-embedded on the first precast well barrel 210, the elevation error of the well barrel generated in steps S3 to S6 can be supplemented, and the final elevation of the well barrel and well cover can be adjusted. By inserting the circular pipe into the symmetrical handrail 140 of the adjustable drainage well cover, the well cover can be adjusted to be flush with the road surface elevation by rotating it clockwise to lower it and counterclockwise to raise it.

[0060] S8. Using the second circular iron barrel 211 pre-embedded on the first precast well barrel 210 as an outer template, pour permeable concrete 910 between the adjustable and lifting drainage well cover and the second circular iron barrel 211. The elevation of the permeable concrete 910 is controlled at the bottom elevation of the third layer of asphalt 812.

[0061] S9. On the road except for the part of permeable concrete 910 that has been poured between the adjustable and lifting drainage well cover and the second round iron barrel 211, the first layer of asphalt 810 and the second layer of asphalt 811 concrete are laid and compacted in layers; the third layer of asphalt 812 of the road is laid and compacted, including the part of permeable concrete 910 that has been poured around the adjustable and lifting drainage well cover.

[0062] S10. After construction is completed, the inspection of the manhole shall be carried out, including the following items: check the cleanliness and flatness of the manhole shell, and whether there are obvious cracks, deformations or rust on the surface; use a light source and rangefinder to check whether the inside of the manhole shell is flat and smooth, and whether there are obvious defects or obstacles; check whether the manhole cover is installed tightly and firmly, and whether there is any water or air leakage between the manhole cover and the manhole shell; use tools such as depth gauges and diameter gauges to measure whether the depth and diameter of the manhole meet the design requirements; record the inspection results in the inspection form and sign to confirm. If any problems are found, the construction unit shall be notified in time for rectification.

[0063] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An adjustable-lift drainage inspection well, characterized in that, Including manhole covers and prefabricated manhole casings, among which, The prefabricated manhole includes a second prefabricated manhole (220), a third prefabricated manhole (230), a second circular iron barrel (211), and a third circular iron barrel (213) for adjusting the lifting and lowering of the manhole cover; the second prefabricated manhole (220) and multiple sets of the third prefabricated manhole (230) are assembled and matched to control the distance from the top surface of the prefabricated manhole to the roadbed and / or the top surface of the road surface to ensure the road surface compaction effect; the inner wall of the third circular iron barrel (213) is designed with threaded inner wall; permeable concrete (910) is provided between the second circular iron barrel (211) and the manhole cover, which not only fixes the manhole cover, but also prevents the drainage hole of the manhole cover from being blocked while cooperating with the manhole cover to drain water; The manhole cover includes a first circular iron barrel (130), the top of which is provided with a plurality of symmetrical strip holes (131), and the outer side is provided with threaded outer wall. The first circular iron barrel (130) and the third circular iron barrel (213) cooperate to control the height difference between the manhole cover and the road surface. The strip holes (131) enable the manhole cover to also serve the function of drainage, thereby increasing the efficiency of the urban drainage system.

2. The adjustable lifting drainage inspection well according to claim 1, characterized in that, The manhole cover includes a standard manhole cover (110), and the standard manhole cover (110) has a wider manhole cover base plate (120) at its lower end.

3. The adjustable lifting drainage inspection well according to claim 2, characterized in that, The first circular iron bucket (130) is fixedly disposed on the lower part of the manhole cover base plate (120).

4. An adjustable-lift drainage inspection well according to any one of claims 2 or 3, characterized in that, The manhole cover includes a handrail (140), which is fixedly disposed on the outside of the manhole cover base plate (120); the handrail (140) includes a rotatable arc-shaped iron ring (141); the rotation of the manhole cover is controlled by inserting a plurality of the arc-shaped iron rings (141) through a round tube.

5. An adjustable-lift drainage inspection well according to any one of claims 1-3, characterized in that, The prefabricated well casing includes a first prefabricated well casing (210) and a fourth prefabricated well casing (240).

6. The adjustable lifting drainage inspection well according to claim 5, characterized in that, The first prefabricated wellbore (210) has a flat top and a tongue-and-groove bottom; the second prefabricated wellbore (220), the third prefabricated wellbore (230) and the fourth prefabricated wellbore (240) have tongue-and-groove tops and tongue-and-groove bottoms.

7. The adjustable lifting drainage inspection well according to claim 6, characterized in that, The heights of the first precast well shaft (210) and the third precast well shaft (230) are the same as the designed water-stabilized layer height; the height of the second precast well shaft (220) is 10cm; the fourth precast well shaft (240) is a standard section with a height of 72cm.

8. An adjustable-lift drainage inspection well according to any one of claims 6 or 7, characterized in that, The first prefabricated well shaft (210) includes a circular iron ring (212) and an embedded part (214); one end of the circular iron ring (212) is fixedly connected to the second circular iron barrel (211), and the other end is fixedly connected to the third circular iron barrel (213).

9. The adjustable lifting drainage inspection well according to claim 1, characterized in that, The third layer of asphalt (812) laid on top of the permeable concrete (910) is permeable asphalt.

10. A method for constructing an adjustable-lift drainage inspection well, characterized in that, The application of the inspection well as described in any one of claims 1-9 includes the following steps: S1. Before construction, prepare a construction plan based on the design drawings and actual site conditions; check whether equipment such as road rollers, bulldozers and water pumps are in good condition and ensure normal operation of the equipment; manufacture adjustable and lifting drainage well covers and prefabricated well cylinders according to the design plan. S2. After the manhole chamber is completed, the fourth precast shaft (240) of the standard section is installed at the reserved opening of the manhole chamber. The installation of the fourth precast shaft (240) is carried out alternately with the backfilling and compaction of earthwork until the standard section installation is stopped when the distance from the top surface of the design roadbed is less than one standard section height. S3. When installing the second precast manhole (220) and the third precast manhole (230), calculate the distance between the top surface elevation of the last installed standard section and the top surface elevation of the roadbed. If the distance is 1-4cm, one section of the second precast manhole (220) can be selected; if the distance is 5-10cm, one section of the second precast manhole (220) can be selected; if the distance is 11-71cm, refer to the 1-10cm selection method and select multiple sections of the second precast manhole (220) and multiple sections of the third precast manhole (230); backfill the earthwork and compact the entire roadbed area, including the area around the precast manhole, using a road roller. S4. If the distance between the top surface of the precast well shaft and the top surface of the first water-stabilized layer (710) is 1-4cm, the height of the well shaft does not need to be increased further; if the distance between the top surface of the precast well shaft and the top surface of the first water-stabilized layer (710) is 5-10cm, a second precast well shaft (220) section is installed; after the first water-stabilized layer (710) is laid, the entire water-stabilized layer area, including the area around the well shaft, is compacted using a road roller; S5. Repeat step S4 to pave and compact the second water-stabilized layer (711); S6. Install a section of the first precast well shaft (210) and install the well cover on the first precast well shaft (210); pave the third water-stabilized layer (712) and compact the entire water-stabilized layer, including the area around the well shaft, using a road roller; S7. Insert the round pipe into the symmetrical handrail (140) of the manhole cover, rotate clockwise to lower it, and rotate counterclockwise to raise it, so that the manhole cover is level with the road surface. S8. Pour permeable concrete (910) between the manhole cover and the second circular iron barrel (211). The elevation of the permeable concrete (910) is controlled at the bottom elevation of the third layer of asphalt (812). S9. On the road except for the manhole, the first layer of asphalt (810) and the second layer of asphalt (811) concrete are laid and compacted in layers; the third layer of asphalt (812) is laid and compacted, including the permeable concrete (910) that has been poured around the manhole cover. S10. After construction is completed, the inspection well shall be inspected and accepted.

Images