Manhole construction process and manhole

Abstract

The application relates to a construction process and a manhole, and the specific steps are as follows: steel cylinder well installation, cutting an excavation area on a road surface, excavating in the excavation area, shaking a pipe of the steel cylinder well to a design elevation, removing earth in the steel cylinder well, and sealing a bottom with concrete; manhole installation, hoisting the manhole into the steel cylinder well; well peripheral backfilling, backfilling between the steel cylinder well and the manhole with backfilling soil. The steel cylinder well is installed before the manhole is installed, the steel cylinder well has a protection effect on construction personnel, and the backfilling soil is filled between the steel cylinder well and the manhole, the installation environment of the manhole is improved, and the installation of the manhole is more firm and stable.

Description

Technical Field

[0001] This application relates to the field of manholes, and in particular to a manhole construction process and a manhole. Background Technology

[0002] Depending on factors such as soil properties, pipe diameter, groundwater level, and surrounding structures, different construction methods can be used for the construction of municipal water supply and drainage pipelines, including pipe jacking, traction, slope excavation, sheet pile support, rammed pipe, and tunnel boring machines. These methods each have their advantages and are diverse, but generally fall into two categories: excavation and trenchless. Excavation methods, such as slope excavation and sheet pile support, have high requirements for soil properties, pipe depth, and groundwater level, and require favorable conditions for their application. Their application is relatively limited, typically used for shallowly buried pipelines in street intersections. In contrast, trenchless methods are less restricted, especially pipe jacking and traction methods, which are widely used in municipal water supply and drainage projects due to their good adaptability to soil properties, pipe depth, and groundwater level.

[0003] After the pipelines are constructed using these trenchless construction methods, the construction of intermediate inspection wells becomes a major issue. Inspection wells are vertical shafts built at regular intervals along underground pipelines to connect rainwater and sewage discharge pipes of different diameters, directions, and heights. They are mainly used by maintenance workers to regularly inspect and dredge the pipes and are one of the underground infrastructures of urban roads.

[0004] Pipelines constructed using trenchless methods are typically buried at greater depths and in more complex geological conditions, often encountering adverse geological conditions such as silt and quicksand. In these situations, the construction difficulty of manholes increases exponentially. Common construction methods for manholes include slope excavation, supported open-cut excavation, and caisson methods. While these methods are generally applicable under normal conditions, they are less suitable for adverse geological conditions such as silt and quicksand, and pose significant safety hazards. Additional reinforcement and auxiliary measures are required to ensure successful construction, leading to a substantial increase in both construction time and cost. Summary of the Invention

[0005] In order to complete the construction of inspection wells safely and efficiently, this application provides a construction process for inspection wells and an inspection well.

[0006] Firstly, the inspection well construction process provided in this application adopts the following technical solution:

[0007] A construction process for inspection wells includes the following steps:

[0008] For the installation of steel cylinder wells, an excavation area is cut out on the road surface, and excavation is carried out in the excavation area. The steel cylinder well is then rolled to the design elevation, the soil inside the steel cylinder well is removed, and the bottom is sealed with concrete.

[0009] Manhole installation: The manhole is hoisted into the steel cylinder well.

[0010] Backfilling around the well involves using backfill soil to fill the space between the steel cylinder well and the inspection well.

[0011] By adopting the above technical solution, a steel cylinder well is installed before the inspection well is installed. The steel cylinder well provides protection for construction personnel, and the backfill soil between the steel cylinder well and the inspection well improves the installation environment of the inspection well, making the installation of the inspection well more secure and stable.

[0012] Preferably, the lower end of the steel well is machined with serrations.

[0013] By adopting the above technical solution, the saw teeth make it easier for the steel cylinder well to break through the soil and sink, and facilitate the installation of the steel cylinder well.

[0014] Preferably, the steel cylinder well has multiple steel cylinder sections, with adjacent steel cylinder sections welded together.

[0015] By adopting the above technical solution, the multi-section steel cylinder is lowered by segmented rocking pipe, which facilitates the installation of the steel cylinder well rocking pipe, and the welding makes the connection between adjacent steel cylinder sections stable.

[0016] Preferably, the bottom of the steel cylinder well is embedded in the soil layer for no less than 1 meter.

[0017] By adopting the above technical solution, it is easier to seal the bottom of the steel well and ensures the stability of the steel well.

[0018] Preferably, a thick layer of crushed stone is laid at the lower end of the inspection well.

[0019] By adopting the above technical solution, the lower end of the base plate is less likely to collapse due to soil properties, thus ensuring the stability of the manhole installation.

[0020] Preferably, the inspection well is connected to the pipeline, and the connection surface between the inspection well and the pipeline is roughened.

[0021] By adopting the above technical solution, the roughening treatment makes the connection between the inspection well and the pipeline tight, strengthens the structural strength of the inspection well and the pipeline, and reduces the probability of cracking and leakage.

[0022] Preferably, the compaction degree of the backfill soil is not less than 95%.

[0023] By adopting the above technical solution, the backfill compaction degree of the backfill soil is not less than 95%, which ensures the stability of the manhole installation.

[0024] Secondly, this application provides a technical solution for a manhole using the following method:

[0025] A manhole, comprising the above-mentioned manhole construction process, includes a base plate, a lower part of the manhole chamber, an upper part of the manhole chamber, a cover plate, a manhole adjusting block, a manhole ring, a protective net, and a manhole cover. The base plate, the lower part of the manhole chamber, the upper part of the manhole chamber, the cover plate, the manhole adjusting block, the manhole ring, and the manhole cover are connected sequentially from bottom to top, and the protective net is connected to the inner wall of the manhole ring.

[0026] By adopting the above technical solution, the protective net can protect people who accidentally fall into the inspection well.

[0027] Preferably, the well ring further includes a first spring, a connecting rod, a baffle, and a sliding rod. The inner wall of the well ring is provided with an installation groove. One end of the first spring is fixedly connected to the groove wall of the installation groove facing the well cover, and the other end of the first spring is fixedly connected to the connecting rod. The protective net is detachably connected to the connecting rod. The inner wall of the well ring is provided with a blocking groove, which is located below the installation groove. The baffle is slidably embedded in the blocking groove, and the sliding direction of the baffle is perpendicular to the bottom of the blocking groove. One end of the sliding rod is fixedly connected to the connecting rod, and the other end of the sliding rod abuts against the end of the baffle away from the blocking groove.

[0028] By adopting the above technical solution, when a person's weight is too heavy and about to exceed the critical value of the protective net, a baffle can be used to block the person a second time, preventing them from falling into the inspection well and protecting their personal safety.

[0029] Preferably, it further includes a second spring, one end of which is connected to the groove wall of the blocking groove, and the other end of which is connected to the baffle.

[0030] By adopting the above technical solution, when the sliding rod cannot block the baffle, the baffle will automatically slide out under the action of the spring, forming a barrier and protecting the personal safety of personnel.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. Before installing the inspection well, install the steel cylinder well first. The steel cylinder well provides protection for construction personnel, and the backfill soil between the steel cylinder well and the inspection well improves the installation environment of the inspection well, making the installation of the inspection well more secure and stable.

[0033] 2. The serrations make it easy for the steel cylinder well to be excavated and sunk. The multi-section steel cylinder is sunk in sections by rolling the pipe, which facilitates the installation of the steel cylinder well pipe. The welding makes the connection between adjacent steel cylinder sections stable.

[0034] 3. Roughening treatment ensures a tight connection between the inspection well and the pipeline, strengthens the structural strength of both the inspection well and the pipeline, and reduces the probability of cracking and leakage. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the installation structure of the inspection well.

[0036] Figure 2 This is a schematic diagram of the internal structure of the inspection well installation structure through a cross-section.

[0037] Figure 3 This is a schematic diagram of the overall structure of the steel cylinder well and pipeline.

[0038] Figure 4 This is a schematic diagram of the overall structure of the inspection well and pipeline.

[0039] Figure 5 This is a schematic diagram of the internal structure of the inspection well after it has been cut open.

[0040] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0041] Figure 7 This is a schematic diagram of the overall structure of the baffle.

[0042] Explanation of reference numerals in the attached drawings: 1. Steel cylinder well; 11. Serrated edge; 12. Steel cylinder; 2. Pipeline; 3. Inspection well; 31. Base plate; 311. Convex ring; 32. Lower part of the well chamber; 33. Upper part of the well chamber; 34. Cover plate; 35. Well cylinder adjusting block; 36. Well ring; 361. Mounting groove; 362. Blocking groove; 3621. Limiting groove; 363. Connection port; 364. Sliding groove; 37. Protective net; 371. Through hole; 38. Well cover; 391. First spring; 392. Connecting rod; 393. Second spring; 394. Baffle; 3941. Main plate; 3942. Abutment plate; 3943. Stop block; 395. Sliding rod; 396. Blocking rod; 397. Hook. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0044] Reference Figure 1 This application discloses a construction process for inspection wells, including the following steps:

[0045] Level the site, clean the surface of the area where the inspection well 3 is installed, and level the ground.

[0046] Reference Figure 2 and Figure 3For the installation of steel cylinder well 1, an excavation area is cut out on the road surface and excavated in the excavation area. The lower end of a section of steel cylinder 12 is cut with serrations 11, and the section of steel cylinder 12 is lowered by a rocker tube. The soil inside the steel cylinder 12 is removed, and a new section of steel cylinder 12 is welded to the original steel cylinder 12 to form steel cylinder well 1. The rocker tube of steel cylinder well 1 is lowered to the design elevation, and the soil inside the steel cylinder well 1 is removed. The bottom of steel cylinder well 1 is embedded in the soil layer for no less than one meter and sealed with C20 concrete.

[0047] Pipeline 2 is installed by connecting the adjacent steel cylinder well 1 using a micro-jacking technique;

[0048] For the installation of manhole 3, a thick layer of crushed stone is laid inside the steel cylinder well 1 and filled flat and compacted. The manhole 3 is then hoisted into the steel cylinder well 1. The interface of the manhole 3 is roughened and then connected to the pipe 2. When connecting, 1:2 cement mortar or polyurethane mixed with cement mortar is used, with the amount of polyurethane used replacing 20%-50% of the water consumption. The joint thickness is 10-15mm.

[0049] Backfilling around the well: Use backfill soil to backfill the space between steel cylinder well 1 and inspection well 3. The backfill soil compaction degree shall not be less than 95%, and the backfill soil shall be stone powder.

[0050] Road surface restoration involves backfilling the roadbed and restoring the road surface according to the requirements of the original road surface structure.

[0051] The implementation principle of the manhole construction process in this application embodiment is as follows: first, the steel cylinder well 1 is installed; after the steel cylinder well 1 is installed, a layer of crushed stone is laid; then the manhole 3 is installed; finally, backfill soil is filled between the steel cylinder well 1 and the manhole 3.

[0052] Reference Figure 4 and Figure 5 This application also discloses an inspection well 3, including a base plate 31, a lower part of the well chamber 32, an upper part of the well chamber 33, a cover plate 34, a well shaft adjusting block 35, a well ring 36, a protective net 37, and a well cover 38. The base plate 31, the lower part of the well chamber 32, the upper part of the well chamber 33, the cover plate 34, the well shaft adjusting block 35, and the well ring 36 are fixedly connected in sequence from bottom to top, and the well cover 38 is connected to the upper end of the well ring 36.

[0053] Reference Figure 5 The upper end of the base plate 31 is provided with a protruding ring 311. The outer circumference of the protruding ring 311 fits the inner circumference of the lower part 32 of the well chamber. The inner diameter of the upper part 33 of the well chamber is equal to the inner diameter of the lower part 32 of the well chamber. The outer diameter of the cover plate 34 is equal to the outer diameter of the upper part 33 of the well chamber. The inner diameter of the cover plate 34 is smaller than the inner diameter of the upper part 33 of the well chamber.

[0054] Reference Figure 5 and Figure 6The inspection well 3 also includes a first spring 391, a connecting rod 392, a second spring 393, a baffle 394, a sliding rod 395, and a blocking rod 396.

[0055] The inner wall of the manhole ring 36 is provided with an installation groove 361. One end of the first spring 391 is fixedly connected to the groove wall of the installation groove 361 facing the manhole cover 38, and the other end of the spring is fixedly connected to the connecting rod 392. The connecting rod 392 is provided with a hook 397, and the protective net 37 is provided with a through hole 371, which allows the hook 397 to be connected. The inner wall of the manhole ring 36 is provided with a blocking groove 362, and the lower groove wall of the blocking groove 362 is provided with a limiting groove 3621. The blocking groove 362 is located below the installation groove 361, and a baffle 394 is slidably embedded in the blocking groove 362. The sliding direction of the baffle 394 is perpendicular to the bottom of the blocking groove 362.

[0056] Reference Figure 7 The baffle 394 includes a main board 3941, an abutment plate 3942, and a stop block 3943.

[0057] Reference Figure 5 and Figure 6 The stop block 3943 is fixedly connected to the end of the main board 3941 opposite to the manhole cover 38. The abutment plate 3942 is fixedly connected to the main board 3941. The abutment plate 3942 is triangular, and its width decreases as it approaches the axis of the manhole ring 36. One end of the second spring 393 is fixedly connected to the groove wall of the limiting groove 3621 opposite to the axis of the manhole ring 36, and the other end of the second spring 393 is fixedly connected to the stop block 3943.

[0058] The well ring 36 has a connecting port 363, and a sliding rod 395 is slidably embedded in the connecting port 363. The sliding direction of the sliding rod 395 is parallel to the axis of the well ring 36. The inner wall of the well ring 36 has a sliding groove 364, which is located below the limiting groove 3621. One end of the connecting port 363 is connected to the sliding groove 364, and the other end of the connecting port 363 is connected to the mounting groove 361. A blocking rod 396 is slidably connected to the inner wall of the sliding groove 364, and the sliding direction of the blocking rod 396 is parallel to the axis of the well ring 36. One end of the sliding rod 395 is fixedly connected to the connecting rod 392, and the other end of the sliding rod 395 is fixedly connected to one end of the blocking rod 396. The other end of the blocking rod 396 is used to abut against the end of the abutment plate 3942 away from the blocking groove 362.

[0059] Eight first springs 391 are provided, and the eight first springs 391 are evenly spaced around the axis of the well ring 36. Eight second springs 393 are provided, and the eight second springs 393 are evenly spaced around the axis of the well ring 36. The first springs 391 and second springs 393 are arranged in a one-to-one correspondence. Eight baffles 394 are provided, and the eight baffles 394 are evenly spaced around the axis of the well ring 36. Adjacent abutment plates 3942 can fit together.

[0060] The implementation principle of a manhole according to an embodiment of this application is as follows: the protective net 37 initially blocks personnel who accidentally fall into the manhole 3. When the protective net 37 is overloaded, the first spring 391 contracts, the connecting rod 392 moves down, the sliding rod 395 moves down, and the blocking rod 396 moves down until it can no longer block the baffle 394. The second spring 393 contracts, and the baffle 394 slides toward the axis of the manhole ring 36 until multiple baffles 394 fit together to form a secondary barrier, protecting people's personal safety. After the personnel are rescued, the baffle 394 can be reset so that the blocking rod 396 blocks the baffle 394, and then the protective net 37 can be reinstalled.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manhole, characterized in that: It includes a base plate (31), a lower part of the well chamber (32), an upper part of the well chamber (33), a cover plate (34), a well shaft adjusting block (35), a well ring (36), a protective net (37), and a well cover (38). The base plate (31), the lower part of the well chamber (32), the upper part of the well chamber (33), the cover plate (34), the well shaft adjusting block (35), the well ring (36), and the well cover (38) are connected sequentially from bottom to top. The protective net (37) is connected to the inner wall of the well ring (36). It also includes a first spring (391), a connecting rod (392), a baffle (394), and a sliding rod (395). The inner wall of the well ring (36) is provided with an installation groove (361). One end of the first spring (391) is fixedly connected to the groove wall of the installation groove (361) facing the well cover (38), and the other end of the first spring (391) is fixedly connected to the connecting rod (392). The protective net (37) is detachably connected to the connecting rod (392). (36) has a blocking groove (362) on its inner wall. The blocking groove (362) is located below the mounting groove (361). The baffle (394) is slidably embedded in the blocking groove (362). The sliding direction of the baffle (394) is perpendicular to the bottom of the blocking groove (362). One end of the sliding rod (395) is fixedly connected to the connecting rod (392), and the other end of the sliding rod (395) abuts against the end of the baffle (394) away from the blocking groove (362).

2. The inspection well according to claim 1, characterized in that: It also includes a second spring (393), one end of which is connected to the groove wall of the blocking groove (362), and the other end of which is connected to the baffle (394).

3. A construction process for inspection wells, applied to the inspection wells described in any one of claims 1-2, characterized in that: Includes the following steps: The steel cylinder well (1) is installed. The excavation area is cut out on the road surface and excavated in the excavation area. The steel cylinder well (1) is rolled to the design elevation. The soil inside the steel cylinder well (1) is removed and the bottom is sealed with concrete. The manhole (3) is installed by hoisting it into the steel cylinder well (1); Backfill around the well, using backfill soil to backfill the space between the steel cylinder well (1) and the inspection well (3).

4. The construction process for inspection wells according to claim 3, characterized in that: The lower end of the steel cylinder well (1) is machined with serrations (11).

5. The construction process for inspection wells according to claim 3, characterized in that: The steel cylinder well (1) is equipped with multiple steel cylinders (12), and adjacent steel cylinders (12) are welded together.

6. The construction process for inspection wells according to claim 3, characterized in that: The bottom of the steel cylinder well (1) is embedded in the soil layer for no less than 1 meter.

7. The construction process for inspection wells according to claim 3, characterized in that: A thick layer of crushed stone is laid at the lower end of the inspection well (3).

8. The construction process for inspection wells according to claim 3, characterized in that: The inspection well (3) is connected to the pipeline (2), and the connection surface of the connection port (363) of the inspection well (3) and the pipeline (2) is roughened.

9. The construction process for inspection wells according to claim 3, characterized in that: The compaction degree of the backfill soil shall not be less than 95%.

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