Municipal rain sewage prefabricated well chamber and well chamber pipe orifice plugging construction method

Abstract

The invention belongs to the technical field of rainwater and sewage pipeline inspection well construction in municipal engineering, particularly relates to a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe orifice plugging construction method, and aims to solve the problems that temporary plugging cannot be performed outside a well chamber and the plugging difficulty is high in the prior art. Comprising a prefabricated well chamber assembly, a pre-buried annular steel plate, a pipeline connecting assembly and a plugging assembly, and the prefabricated well chamber assembly comprises a shaft, a blow-off pipe, a reserved pipe opening and an electric valve. External rotation operation is converted into linear motion of the plugging plate through a gear transmission system, a first bevel gear, a second bevel gear, a worm gear and a worm structure are driven by rotating a handle of the warning board, an operator can remotely control the plugging plate to be closed without entering a well chamber, the operation difficulty is greatly reduced, and the working efficiency is improved. Meanwhile, due to the self-locking characteristic of the worm gear and the worm, the blocking plate can be prevented from rebounding accidentally, and it is ensured that the blocking state is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater and sewage pipeline inspection well construction in municipal engineering, and in particular to a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening blocking construction method. Background Art

[0002] The rainwater and sewage pipe inspection wells in municipal engineering are key structures in the urban drainage system, mainly used for the collection, transfer and maintenance of rainwater and sewage. Traditional inspection wells mostly use on-site bricklaying or concrete pouring technology, which has problems such as long construction period and quality greatly affected by human factors. With the development of prefabrication technology, municipal rainwater and sewage prefabricated well chambers have gradually been promoted and applied. Prefabricated well chambers are produced through factory-based standard components and assembled on-site. They have the advantages of high construction efficiency, uniform structural strength, and good waterproof performance. Its core function is to connect upstream and downstream pipelines, adjust the direction of water flow, and seal the pipe openings when necessary for maintenance operations. However, existing prefabricated well chambers still face many technical bottlenecks in the pipe opening sealing link.

[0003] At present, the pipe opening plugging methods commonly used in municipal engineering mostly rely on internal operations, that is, temporary plugging inside the well chamber. Since the space inside the well chamber is small and often contains accumulated water, it is difficult for operators to effectively implement the plugging operation. Traditional plugging materials such as rubber plugs or cement mortar are prone to gaps due to material aging and shrinkage, leading to the risk of leakage. In addition, the existing technology lacks a device for direct external plugging and relies on manual entry into the well chamber for operation, which is not only inefficient but also poses a safety hazard. Especially in the rainy season or when the sewage flow is large, the water level in the well chamber rises rapidly, further exacerbating the difficulty of plugging. Therefore, there is an urgent need for a prefabricated well chamber and plugging construction method that can achieve rapid external operation and has multiple sealing guarantees. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening sealing construction method, which overcomes the shortcomings of the existing technology and effectively solves the problem of being unable to perform temporary sealing outside the well chamber and the difficulty of sealing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A prefabricated well chamber for municipal rainwater and sewage, comprising a prefabricated well chamber assembly, an embedded annular steel plate, a pipe connection assembly and a plugging assembly; the prefabricated well chamber assembly comprises a wellbore, a sewage pipe, a reserved pipe opening and an electric valve; the wellbore is a cylindrical structure, and symmetrically distributed embedded annular steel plates are embedded on the inner wall of the wellbore; the embedded annular steel plates are located inside the reserved pipe openings, and the embedded annular steel plates are symmetrically distributed along the axis of the wellbore; the sewage pipe is located at the bottom of the wellbore, and the electric valve is installed on the outer wall of the sewage pipe; there are two reserved pipe openings, and the two reserved pipe openings are respectively arranged on the inner walls on both sides of the wellbore.

[0006] Preferably, the pipe connection assembly includes a water pipe and a flange, the flange is an annular structure, and a flange is provided at the end of the embedded annular steel plate away from the wellbore, the outer diameter of the flange is consistent with the outer diameter of the flange of the embedded annular steel plate on the inner wall of the wellbore, and the water pipe is welded to the outer wall of one side of the flange, the water pipe includes an inlet pipe and a drain pipe, and the water inlet pipe and the drain pipe are respectively located on both sides of the wellbore, and the surfaces of the flange and the flange are provided with evenly distributed bolt holes.

[0007] Preferably, the flange plate and the flange of the embedded annular steel plate are fixedly connected with bolts distributed at equal distances, and the bolt diameter matches the inner diameter of the bolt hole. The bolts pass through the bolt holes of the flange plate and are fixedly connected with the bolt holes of the flange of the embedded annular steel plate.

[0008] Preferably, the sealing assembly includes an annular sealing gasket and a fast-hardening cement layer. The annular sealing gasket is made of EPDM rubber. Annular grooves are provided on the outer walls of one side of the flange and the flange, and the annular sealing gasket is tightly attached between the two annular grooves. The annular sealing gasket and the annular groove have an interference fit. The fast-hardening cement layer fills the gap between the outer periphery of the embedded annular steel plate and the inner wall of the wellbore.

[0009] Preferably, a detachable manhole cover is placed on the top of the well shaft, and an escalator is pre-buried in the inner wall of one side of the well shaft.

[0010] The cam is connected to the gear box at the bottom of the gear box, and the cam is connected to the gear box on both sides of the gear box, and the cam is connected to the gear box on the bottom of the gear box.

[0011] Preferably, the worm and drive shaft are rotatably connected to the inner wall of the gear mounting box, and the worm wheel, worm, first bevel gear and second bevel gear are all located inside the gear mounting box, the top seat is located at the top of the gear mounting box, and the top seat is embedded in the top outer wall of the wellbore.

[0012] Preferably, the warning sign includes a blocking control block, a base, a column, a warning plate and a handle, wherein a strip groove is opened on the top outer wall of the top seat, and the blocking control block is tightly attached to the inner wall of the strip groove, the base is welded to the top outer wall of the blocking control block, the column is welded to the top outer wall of the base, the warning plate is welded to the top outer wall of the column, and the handle is welded to the outer wall on one side of the column.

[0013] Preferably, a support frame is rotatably connected to the outer wall of the passive rotating shaft via a bearing, and the support frame is welded to the inner wall of the wellbore.

[0014] A method for sealing a pipe opening of a municipal rainwater and sewage prefabricated well chamber comprises the following steps: Step S1: insert the blocking control block at the bottom of the warning sign into the strip groove at the top of the top seat, and ensure that the blocking control block fits tightly against the inner wall of the strip groove; Step S2: By turning the handle on the warning sign, the pillar and the blocking control block are driven to rotate synchronously, thereby driving the drive shaft in the top seat to rotate; Step S3: The driving shaft drives the worm to rotate through the meshing of the second bevel gear and the first bevel gear. The worm is meshed with the worm wheel to drive the passive rotating shaft to rotate axially. Step S4: The passive rotating shaft is linked by the first connecting rod and the second connecting rod welded on both sides thereof. The rotation of the passive rotating shaft can push the blocking plate to rotate around the hinge point until the blocking plate is close to the outer wall of the embedded annular steel plate, completing the blocking of the reserved pipe orifice; Step S5: Afterwards, the electric valve is activated to drain the sewage inside the wellbore through the sewage pipe; Step S6: The operator can open the manhole cover and enter the wellbore through the escalator to check the sealing status of the annular sealing gasket and the rapid hardening cement layer.

[0015] The beneficial effects of the present invention are: 1. The municipal rainwater and sewage prefabricated well chamber and well chamber pipe opening sealing construction method of the present invention constructs a double-channel sealing barrier through the synergistic effect of the annular sealing gasket and the fast-hardening cement layer. The annular sealing gasket made of EPDM rubber is embedded in the annular groove through interference fit to form an elastic sealing layer, which can immediately compensate for installation errors; the fast-hardening cement layer is filled in the gap between the pre-buried annular steel plate and the wellbore, and after curing, it forms a rigid sealing body that effectively resists water pressure shock. The combination of the two not only solves the problem of easy failure of traditional single-layer sealing, but also avoids the risk of leakage caused by material aging, significantly improving the reliability of sealing; 2. The municipal rainwater and sewage prefabricated well chamber and well chamber pipe opening sealing construction method of the present invention converts external rotation operations into linear motion of the sealing plate through a gear transmission system, and drives the first bevel gear and the second bevel gear and the worm gear and worm structure by rotating the handle of the warning sign. The operator can remotely control the closing of the sealing plate without entering the well chamber, which greatly reduces the difficulty of operation. It is especially suitable for high water level or toxic gas environment. At the same time, the self-locking characteristics of the worm gear and worm can prevent the sealing plate from accidentally rebounding, ensuring the stability of the sealing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening plugging construction method proposed by the present invention; Figure 2 This is a schematic diagram of the internal connection structure of a prefabricated well chamber component of a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening plugging construction method proposed by the present invention; Figure 3 Schematic diagram of the disassembled structure of the pipe connection assembly and the plugging assembly of a municipal rainwater and sewage prefabricated well chamber and the well chamber pipe opening plugging construction method proposed by the present invention Figure 1 ; Figure 4 Schematic diagram of the disassembled structure of the pipe connection assembly and the plugging assembly of a municipal rainwater and sewage prefabricated well chamber and the well chamber pipe opening plugging construction method proposed by the present invention Figure 2 ; Figure 5 This is a schematic diagram of the internal structure of a prefabricated well chamber assembly for a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening plugging construction method proposed by the present invention; Figure 6 This is a schematic diagram of the internal connection structure of the gear installation box of a municipal rainwater and sewage prefabricated well chamber and the well chamber pipe opening plugging construction method proposed by the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the top and base of a municipal rainwater and sewage prefabricated well chamber and a well chamber pipe opening sealing construction method proposed by the present invention.

[0017] In the figure: 1. Prefabricated well chamber assembly; 101. Wellbore; 102. Sewage pipe; 103. Reserved pipe opening; 104. Electric valve; 2. Embedded annular steel plate; 3. Pipe connection assembly; 301. Water pipe; 302. Flange; 4. Sealing assembly; 401. Quick-hardening cement layer; 402. Annular sealing gasket; 5. Bolt hole; 6. Bolt; 7. Annular groove; 8. Gear mounting box; 9. Passive rotating shaft; 10. First connecting rod; 11. Second connecting rod; 12. Sealing plate; 13. Worm gear; 14. Worm; 15. First bevel gear; 16. Second bevel gear; 17. Drive shaft; 18. Top seat; 19. Warning sign; 191. Sealing control block; 192. Base; 193. Column; 194. Warning plate; 195. Handle; 20. Support frame; 21. Well cover; 22. Escalator. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figures 1-6 , embodiment 1, includes a prefabricated well chamber assembly 1, an embedded annular steel plate 2, a pipe connection assembly 3 and a sealing assembly 4, the prefabricated well chamber assembly 1 includes a wellbore 101, a sewage pipe 102, a reserved pipe port 103 and an electric valve 104, the wellbore 101 is a cylindrical structure, and symmetrically distributed embedded annular steel plates 2 are embedded on the inner wall of the wellbore 101, the embedded annular steel plates 2 are located inside the reserved pipe port 103, and the embedded annular steel plates 2 are symmetrically distributed along the axial direction of the wellbore 101, the sewage pipe 102 is located at the bottom of the wellbore 101, and the electric valve 104 is installed on the outer wall of the sewage pipe 102, the reserved pipe port 103 includes two, and the two reserved pipe ports 103 are respectively arranged on the inner walls on both sides of the wellbore 101.

[0020] The pipe connection assembly 3 includes a water pipe 301 and a flange 302. The flange 302 is an annular structure, and a flange is provided at the end of the embedded annular steel plate 2 away from the wellbore 101. The outer diameter of the flange 302 is consistent with the outer diameter of the flange of the embedded annular steel plate 2 on the inner wall of the wellbore 101, and the water pipe 301 is welded to the outer wall of one side of the flange 302. The water pipe 301 includes a water inlet pipe and a drain pipe, and the water inlet pipe and the drain pipe are respectively located on both sides of the wellbore 101. The surfaces of the flange 302 and the flange are provided with evenly distributed bolt holes 5.

[0021] The flange 302 and the flange of the embedded annular steel plate 2 are fixedly connected with bolts 6 distributed at equal distances, and the diameter of the bolts 6 matches the inner diameter of the bolt holes 5. The bolts 6 pass through the bolt holes 5 of the flange 302 and are fixedly connected with the bolt holes 5 of the flange of the embedded annular steel plate 2.

[0022] The flange 302 and bolt 6 connection structure establishes a permanent, rigid connection between the water pipe 301 and the wellbore 101. The bolt 6 fastening design of the flange 302 and the embedded annular steel plate 2 ensures zero displacement of the connection, avoiding gaps caused by aging or shrinkage in traditional brickwork or concrete seals. Furthermore, a dual-sealing structure employs an annular gasket 402 and a rapid-hardening cement layer 401. The first seal is achieved through the elastic compression of the annular gasket 402, while the second seal forms a rigid barrier through the curing of the rapid-hardening cement layer 401, providing a dual barrier to effectively prevent leakage.

[0023] The sealing assembly 4 includes an annular sealing gasket 402 and a fast-hardening cement layer 401. The annular sealing gasket 402 is made of EPDM rubber. An annular groove 7 is provided on the outer wall of one side of the flange 302 and the flange, and the annular sealing gasket 402 is tightly attached between the two annular grooves 7. The annular sealing gasket 402 and the annular groove 7 have an interference fit. The fast-hardening cement layer 401 fills the gap between the outer periphery of the embedded annular steel plate 2 and the inner wall of the wellbore 101.

[0024] Ring-shaped gasket 402 is made of EPDM rubber, which has superior corrosion and aging resistance to ordinary rubber and a long service life. Flange 302 and water pipe 301 are welded continuously around the entire circumference and ultrasonically inspected to ensure flawless welds, preventing connection failures caused by weak welds.

[0025] A detachable manhole cover 21 is placed on the top of the shaft 101 , and a ladder 22 is pre-buried on the inner wall of one side of the shaft 101 .

[0026] The use of a prefabricated well chamber assembly 1 and a rapid-hardening cement layer 401 significantly shortens the construction period. The standardized design of the flange 302 connection and the prefabricated well chamber assembly 1 reduces reliance on skilled labor and lowers labor costs. Furthermore, the rapid-hardening cement's precise proportioning and fluid slurry design ensure a dense, void-free pour, eliminating the need for secondary repairs and further saving material and time costs.

[0027] In this embodiment, the synergistic effect of annular sealing gasket 402 and rapid-hardening cement layer 401 creates a dual-layer sealing barrier. The EPDM rubber annular sealing gasket 402 is inserted into the annular groove 7 through an interference fit, forming an elastic sealing layer that instantly compensates for installation errors. The rapid-hardening cement layer 401 fills the gap between the pre-embedded annular steel plate 2 and the wellbore 101. After curing, it forms a rigid seal that effectively resists water pressure shock. This combination not only solves the problem of traditional single-layer sealing, which is prone to failure, but also avoids the risk of leakage caused by material aging, significantly improving sealing reliability.

[0028] Embodiment 2, a municipal rainwater and sewage prefabricated well chamber pipe orifice plugging construction device, comprising a gear mounting box 8 welded to the top inner wall of the well shaft 101, the bottom inner wall of the gear mounting box 8 is rotatably connected to a passive rotating shaft 9, and both sides of the bottom outer wall of the passive rotating shaft 9 are welded with a first connecting rod 10, one end of the first connecting rod 10 is rotatably connected to the outer wall of the second connecting rod 11, and one end of the second connecting rod 11 is rotatably connected to the outer wall of the plugging plate 12, and the plugging plate 12 is hinged on the inner wall of the well shaft 101. The sealing plate 12 is tightly attached to the outer wall of the embedded annular steel plate 2, a worm gear 13 is fixedly connected to the outer wall of the passive rotating shaft 9, and a worm 14 is meshed on the outer wall of the worm gear 13, a first bevel gear 15 is welded to the outer wall of one end of the worm 14, and a second bevel gear 16 is meshed on the outer wall of the first bevel gear 15, a drive shaft 17 is fixedly connected to the inner wall of the second bevel gear 16, and a top seat 18 is welded to the top outer wall of the drive shaft 17, and a warning sign 19 is placed on the top outer wall of the top seat 18.

[0029] The worm 14 and the drive shaft 17 are rotatably connected to the inner wall of the gear mounting box 8, and the worm wheel 13, the worm 14, the first bevel gear 15, and the second bevel gear 16 are all located inside the gear mounting box 8. The top seat 18 is located at the top of the gear mounting box 8, and the top seat 18 is embedded in the top outer wall of the wellbore 101.

[0030] The warning sign 19 includes a blocking control block 191, a base 192, a column 193, a warning plate 194 and a handle 195, wherein a strip groove is opened on the top outer wall of the top seat 18, and the blocking control block 191 is tightly attached to the inner wall of the strip groove, the base 192 is welded to the top outer wall of the blocking control block 191, the column 193 is welded to the top outer wall of the base 192, the warning plate 194 is welded to the top outer wall of the column 193, and the handle 195 is welded to the outer wall of one side of the column 193.

[0031] A support frame 20 is rotatably connected to the outer wall of the passive rotating shaft 9 via a bearing, and the support frame 20 is welded to the inner wall of the wellbore 101 .

[0032] In this embodiment, the external rotation operation is converted into the linear motion of the sealing plate 12 through the gear transmission system, and the first bevel gear 15 and the second bevel gear 16 and the worm gear 13 and the worm 14 structure are driven by rotating the handle 195 of the warning sign 19. The operator can remotely control the closing of the sealing plate 12 without entering the well chamber, which greatly reduces the difficulty of operation. It is especially suitable for high water level or toxic gas environment. At the same time, the self-locking characteristics of the worm gear 13 and the worm 14 can prevent the sealing plate 12 from accidentally rebounding, ensuring the stability of the sealing state.

[0033] Example 3, a method for sealing the pipe opening of a municipal rainwater and sewage prefabricated well chamber, comprising the following steps: Step S1: Insert the blocking control block 191 at the bottom of the warning sign 19 into the strip groove at the top of the top seat 18, and ensure that the blocking control block 191 fits tightly against the inner wall of the strip groove; Step S2: By rotating the handle 195 on the warning sign 19, the pillar 193 and the blocking control block 191 are driven to rotate synchronously, thereby driving the drive shaft 17 in the top seat 18 to rotate; Step S3: The driving shaft 17 drives the worm 14 to rotate through the meshing of the second bevel gear 16 and the first bevel gear 15. The worm 14 meshes with the worm wheel 13, driving the passive rotating shaft 9 to rotate axially. Step S4: The passive rotating shaft 9 rotates through the linkage of the first connecting rod 10 and the second connecting rod 11 welded on both sides thereof, and the passive rotating shaft 9 can push the blocking plate 12 to rotate around the hinge point until the blocking plate 12 is close to the outer wall of the embedded annular steel plate 2, completing the blocking of the reserved pipe opening 103; Step S5: Afterwards, the electric valve 104 is activated to drain the sewage inside the wellbore 101 through the sewage pipe 102; Step S6: The operator can open the manhole cover 21 and enter the wellbore 101 through the escalator 22 to check the sealing status of the annular sealing gasket 402 and the rapid hardening cement layer 401.

[0034] Working principle: 1. Blockage start-up phase The operator accurately inserts the blocking control block 191 of the warning sign 19 into the strip groove of the top seat 18, rotates the handle 195, and the worm 14 drives the worm wheel 13 to reduce the transmission.

[0035] 2. Mechanical transmission stage The passive rotating shaft 9 rotates axially under the drive of the worm gear 13, driving the first connecting rod 10 to push the second connecting rod 11 to expand. Through the motion conversion of the first connecting rod 10 and the second connecting rod 11, the sealing plate 12 will move in a fan shape around the hinge point, and finally press the embedded annular steel plate 2 in a surface contact manner. The self-locking characteristics of the worm gear 13 and the worm 14 ensure that the sealing plate 12 maintains a stable closed state under hydrostatic pressure.

[0036] 3. Sealing implementation stage The annular sealing gasket 402 generates compression deformation during the flange pressing process, forming the first elastic seal; the rapid hardening cement layer 401 initially sets 2 hours after pouring and completely solidifies 24 hours after pouring, eliminating micro-leakage channels.

[0037] 4. Status check phase After the electric valve 104 is activated, the sewage inside the wellbore 101 is quickly drained through the sewage pipe 102. Maintenance personnel enter the wellbore 101 through the escalator 22 and use an ultrasonic flaw detector to perform non-destructive testing on the rapid-hardening cement layer 401 to ensure that there are no cracks or cavities.

[0038] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A municipal rainwater and sewage prefabricated well chamber, comprising a prefabricated well chamber assembly (1), a pre-buried annular steel plate (2), a pipe connection assembly (3) and a plugging assembly (4), characterized in that: The prefabricated well chamber assembly (1) comprises a wellbore (101), a sewage pipe (102), a reserved pipe opening (103) and an electric valve (104); the wellbore (101) is cylindrical in structure, and symmetrically distributed pre-embedded annular steel plates (2) are pre-embedded on the inner wall of the wellbore (101); the pre-embedded annular steel plates (2) are located inside the reserved pipe opening (103), and the pre-embedded annular steel plates (2) are symmetrically distributed along the axis of the wellbore (101); the sewage pipe (102) is located at the bottom of the wellbore (101), and the electric valve (104) is installed on the outer wall of the sewage pipe (102); the reserved pipe openings (103) include two, and the two reserved pipe openings (103) are respectively arranged on the inner walls of both sides of the wellbore (101).

2. A municipal rainwater and sewage prefabricated well chamber according to claim 1, characterized in that: The pipe connection assembly (3) comprises a water pipe (301) and a flange (302), wherein the flange (302) is an annular structure, and a flange is provided at one end of the embedded annular steel plate (2) away from the wellbore (101), the outer diameter of the flange (302) is consistent with the outer diameter of the flange of the embedded annular steel plate (2) on the inner wall of the wellbore (101), and the water pipe (301) is welded to one outer wall of the flange (302), the water pipe (301) comprises a water inlet pipe and a drain pipe, and the water inlet pipe and the drain pipe are respectively located on both sides of the wellbore (101), and the surfaces of the flange (302) and the flange are both provided with evenly distributed bolt holes (5).

3. A municipal rainwater and sewage prefabricated well chamber according to claim 2, characterized in that: Bolts (6) distributed at equal distances are fixedly connected between the flange (302) and the flange of the embedded annular steel plate (2), and the diameter of the bolts (6) matches the inner diameter of the bolt holes (5). The bolts (6) pass through the bolt holes (5) of the flange (302) and are fixedly connected to the bolt holes (5) of the flange of the embedded annular steel plate (2).

4. A municipal rainwater and sewage prefabricated well chamber according to claim 1, characterized in that: The plugging assembly (4) comprises an annular sealing gasket (402) and a rapid-hardening cement layer (401), wherein the annular sealing gasket (402) is made of EPDM rubber, annular grooves (7) are provided on the outer wall of one side of the flange (302) and the flange, and the annular sealing gasket (402) is tightly attached between the two annular grooves (7), and the annular sealing gasket (402) and the annular grooves (7) are interference-fitted, and the rapid-hardening cement layer (401) is filled in the gap between the outer periphery of the embedded annular steel plate (2) and the inner wall of the wellbore (101).

5. The municipal rainwater and sewage prefabricated well chamber according to claim 1, characterized in that: A detachable manhole cover (21) is placed on the top of the wellbore (101), and a ladder (22) is pre-buried in the inner wall of one side of the wellbore (101).

6. A municipal rainwater and sewage prefabricated well chamber pipe opening plugging construction device, comprising a gear mounting box (8) welded to the top inner wall of a well shaft (101), characterized in that: The inner wall of the bottom of the gear mounting box (8) is rotatably connected to a passive rotating shaft (9), and first connecting rods (10) are welded to both sides of the outer wall of the bottom of the passive rotating shaft (9), one end of the outer wall of the first connecting rod (10) is rotatably connected to a second connecting rod (11), and one end of the outer wall of the second connecting rod (11) is rotatably connected to a blocking plate (12), and the blocking plate (12) is hinged on the inner wall of the wellbore (101), and the blocking plate (12) is tightly attached to the outer wall of the embedded annular steel plate (2). A worm wheel (13) is fixedly connected to the outer wall of the rotating shaft (9), and a worm (14) is meshed on the outer wall of the worm wheel (13). A first bevel gear (15) is welded to the outer wall of one end of the worm (14), and a second bevel gear (16) is meshed on the outer wall of the first bevel gear (15). A driving shaft (17) is fixedly connected to the inner wall of the second bevel gear (16), and a top seat (18) is welded to the outer wall of the top of the driving shaft (17). A warning sign (19) is placed on the outer wall of the top of the top seat (18).

7. A municipal rainwater and sewage prefabricated well chamber pipe opening blocking construction device according to claim 6, characterized in that: The worm (14) and the drive shaft (17) are rotatably connected to the inner wall of the gear mounting box (8), and the worm wheel (13), the worm (14), the first bevel gear (15), and the second bevel gear (16) are all located inside the gear mounting box (8). The top seat (18) is located at the top of the gear mounting box (8), and the top seat (18) is embedded in the top outer wall of the wellbore (101).

8. A municipal rainwater and sewage prefabricated well chamber pipe opening blocking construction device according to claim 6, characterized in that: The warning sign (19) comprises a blocking control block (191), a base (192), a column (193), a warning plate (194) and a handle (195), wherein a strip groove is provided on the top outer wall of the top seat (18), and the blocking control block (191) is tightly attached to the inner wall of the strip groove, the base (192) is welded to the top outer wall of the blocking control block (191), the column (193) is welded to the top outer wall of the base (192), the warning plate (194) is welded to the top outer wall of the column (193), and the handle (195) is welded to the outer wall of one side of the column (193).

9. A municipal rainwater and sewage prefabricated well chamber pipe opening blocking construction device according to claim 6, characterized in that: A support frame (20) is rotatably connected to the outer wall of the passive rotating shaft (9) via a bearing, and the support frame (20) is welded to the inner wall of the wellbore (101).

10. A method for sealing a pipe opening of a municipal rainwater and sewage prefabricated well chamber, according to the municipal rainwater and sewage prefabricated well chamber pipe opening sealing construction device according to any one of claims 6 to 9, characterized in that: The following steps are involved: Step S1: inserting the blocking control block (191) at the bottom of the warning sign (19) into the strip groove at the top of the top seat (18), and ensuring that the blocking control block (191) is tightly fitted to the inner wall of the strip groove; Step S2: by rotating the handle (195) on the warning sign (19), the column (193) and the blocking control block (191) are driven to rotate synchronously, thereby driving the drive shaft (17) in the top seat (18) to rotate; Step S3: The driving shaft (17) drives the worm (14) to rotate through the meshing of the second bevel gear (16) and the first bevel gear (15); the worm (14) meshes with the worm wheel (13), and drives the passive rotating shaft (9) to rotate axially; Step S4: The passive rotating shaft (9) is linked by the first connecting rod (10) and the second connecting rod (11) welded on both sides thereof, and the rotation of the passive rotating shaft (9) can push the blocking plate (12) to rotate around the hinge point until the blocking plate (12) is closely attached to the outer wall of the embedded annular steel plate (2), thereby completing the blocking of the reserved pipe opening (103); Step S5: Afterwards, the electric valve (104) is activated to drain the sewage inside the wellbore (101) through the sewage pipe (102); Step S6: The operator can open the manhole cover (21) and enter the wellbore (101) via the escalator (22) to check the sealing state of the annular sealing gasket (402) and the rapid hardening cement layer (401).

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