A prefabricated repair structure for a circular manhole in a pipeline network

Abstract

This utility model provides a prefabricated repair structure for a circular manhole inspection well in a pipeline network. The repair structure includes a prefabricated manhole, a vertical shaft, and a first sleeve. The prefabricated manhole includes a base, several sets of first arc-shaped blocks, and at least one set of second arc-shaped blocks. Multiple arc-shaped blocks can be detachably and sealed together to form a cylindrical manhole body with openings at both ends. The base can be detachably and sealed at the bottom opening of the cylindrical manhole body. The second arc-shaped blocks include a second arc-shaped block body, and through holes or semi-through holes are provided on the side walls of the second arc-shaped block body. Adjacent semi-through holes can be combined to form an installation hole of a preset diameter. One end of the first sleeve is sealed to the installation hole / through hole, and the other end is used to seal and connect to a drainage pipe. The vertical shaft is a cylindrical body with openings at both ends, and its bottom opening is detachably and sealed to the top opening of the cylindrical manhole body. This utility model enables convenient and rapid repair of circular brick manholes without excavation.

Description

Technical Field

[0001] This utility model relates to the field of inspection well repair technology, and in particular to a prefabricated repair structure for a circular manhole inspection well in a pipeline network. Background Technology

[0002] Inspection wells are vertical shafts built at regular intervals along underground pipelines for rainwater and sewage discharge. They are used to connect pipelines of different diameters, directions, and heights. They are mainly used by maintenance workers to regularly inspect and dredge pipelines, remove sludge and foreign objects, and prevent pipeline blockages. They are one of the underground infrastructures of urban roads.

[0003] Existing inspection wells are mostly made of brick, which has poor quality stability and low brick strength, making them prone to structural damage, sewage leakage, and injuries from manhole covers. During repairs, due to the limitation of the well opening size (700mm diameter), when the size of the prefabricated well chamber is larger than the well opening size, the conventional prefabricated well chamber cannot be lowered into the brick inspection well through the narrow well opening, which brings challenging difficulties to trenchless repairs. The traditional approach for this situation is to carry out large-area excavation for repair, which is time-consuming, costly, and causes many inconveniences to traffic.

[0004] Therefore, there is an urgent need for a prefabricated repair structure for circular manhole inspection wells in pipeline networks, which can enable convenient and rapid repair of damaged brick manholes without excavation. Utility Model Content

[0005] The purpose of this invention is to provide a prefabricated repair structure for circular manhole inspection wells in pipeline networks, aiming to solve the technical problems of long repair cycles and high costs associated with traditional open-cut repair methods.

[0006] To achieve the above objectives, in a first aspect, this utility model provides a prefabricated repair structure for a circular manhole inspection well in a pipeline network, comprising a vertically arranged prefabricated manhole, a vertical manhole cylinder that is detachably connected to the prefabricated manhole, and a first pipe sleeve.

[0007] The prefabricated well chamber includes a base, several pairs of first arc-shaped panels and at least one pair of second arc-shaped panels. The multiple arc-shaped panels can be detachably and sealed together to form a cylindrical well chamber body with openings at both ends. The base can be detachably and sealed to block the bottom opening of the cylindrical well chamber body.

[0008] The second arc-shaped module includes a second arc-shaped module body, and a through hole or a semi-through hole is provided on the side wall of the second arc-shaped module body. Adjacent semi-through holes can be combined to form a mounting hole of a preset diameter.

[0009] One end of the first sleeve is sealed to the mounting hole / through hole, and the other end is used to seal to the corresponding drain pipe;

[0010] The vertical shaft is a cylinder with openings at both ends, and its bottom opening is detachably and sealed to the top opening of the main body of the cylindrical well chamber.

[0011] As a further improvement to the above solution, the bottom end of each arc-shaped block extends into a first sealing connection part, and the inner wall of the first sealing connection part is provided with a first groove.

[0012] Each of the first grooves is sealed together to form a first sealing groove when the cylindrical well body is assembled; an expandable sealing element is provided in the first sealing groove to achieve a sealed connection with the base.

[0013] As a further improvement to the above solution, if the vertical shaft and the prefabricated well chamber are coaxially arranged, and the diameter ratio between the two is greater than or equal to a preset value;

[0014] Each arc-shaped block extends a second sealing connection at its top, and the inner wall of the second sealing connection is provided with a second groove;

[0015] Each of the second grooves is sealed and joined together to form a second sealing groove when the main body of the cylindrical well chamber is assembled; an expandable sealing element is provided in the second sealing groove to achieve a sealed connection with the vertical well barrel.

[0016] As a further improvement to the above solution, if the axes of the vertical shaft and the prefabricated well chamber are parallel and eccentrically arranged, and the diameter ratio between the two is less than a preset value;

[0017] The bottom end of the vertical shaft is detachably connected to the top end of the prefabricated well chamber via a spliced ​​cover plate.

[0018] As a further improvement to the above solution, the spliced ​​cover plate includes at least a first cover plate assembly and a second cover plate assembly that are configured to be split apart;

[0019] The first cover plate assembly and the second cover plate assembly are detachably and sealed together to form a shape that fits the top opening of the prefabricated well chamber;

[0020] At least one cover plate assembly is provided with an installation structure adapted to be installed and plugged into the bottom end of the vertical shaft.

[0021] As a further improvement to the above solution, the first arc-shaped puzzle piece includes a first arc-shaped puzzle piece body and connecting plates respectively disposed on both sides of the first arc-shaped puzzle piece body, and the connecting plates are also respectively disposed on both sides of the second arc-shaped puzzle piece body;

[0022] Each of the connecting plates extends toward the center of the cylindrical well body;

[0023] Each connecting plate is provided with a number of connecting holes spaced apart along its height direction;

[0024] The adjacent first arc-shaped panels, the adjacent second arc-shaped panels, and the first and second arc-shaped panels are detachably bolted together in pairs through corresponding connecting holes.

[0025] As a further improvement to the above solution, expansion seals are provided at the joints of each arc-shaped block to enable detachable and sealed splicing of multiple arc-shaped blocks.

[0026] As a further improvement to the above solution, each arc-shaped block has a groove on both sides, and the groove extends along its height direction; the expansion seal is disposed in the groove.

[0027] As a further improvement to the above solution, each arc-shaped tile also includes an arc edge set at the bottom of the corresponding arc-shaped tile body;

[0028] The base is detachably and sealed at the bottom of the cylindrical well body via a clamping device; one end of the clamping device is connected to the base, and the other end can be adjusted to press the arc edge to achieve a detachable seal with the cylindrical well body.

[0029] As a further improvement to the above solution, if the original brick-built inspection well is also provided with drainage branch pipes along its height direction, the vertical well is divided into at least two sections, and an open clamp is installed at the corresponding drainage branch pipe. The vertical well sections stacked on top of each other are connected into one unit by the open clamp.

[0030] The open clamp includes a clamp body that is split in half and has two openings arranged axially, and at least one side opening arranged radially. A second pipe sleeve is provided at the side opening for connecting a drainage branch pipe.

[0031] As a further improvement to the above solution, both the first sleeve and the second sleeve are made of stainless steel.

[0032] As a further improvement to the above solution, one end of each sleeve is provided with a sealing ring at the corresponding opening;

[0033] Its other end of the outer wall is also provided with a sealing structure for detachable and sealed connection with the corresponding drain pipe / drain branch pipe;

[0034] Specifically, the sealing structure includes a third sealing groove disposed on the outer wall of the other end of the sleeve, and a third sealing ring disposed within the third sealing groove; preferably, the third sealing ring is a toothed sealing ring.

[0035] As a further improvement to the above scheme, each arc-shaped assembly, cover plate assembly, and vertical shaft is made of ductile iron.

[0036] Secondly, this utility model also provides a repair construction method for a prefabricated repair structure of a circular manhole inspection well in a pipeline network as described in the first aspect, the steps of which include:

[0037] S1. First, hoist the base to the bottom of the well and level and support it; then hoist each arc-shaped block and the first pipe sleeve to the bottom of the well; seal and splice the arc-shaped blocks according to the drainage pipe layout to form a cylindrical well chamber body with open ends, and detachably and securely connect the bottom end of the cylindrical well chamber body to the base.

[0038] Then, a U-shaped sealing ring is installed at the mounting hole / through hole on the side wall of the cylindrical well body, and the first pipe sleeve is inserted into the corresponding mounting hole / through hole and sealed.

[0039] S2. If the vertical shaft and the prefabricated well chamber are coaxially arranged, the vertical shaft is hoisted to the required position, and the bottom end of the vertical shaft is sealed and inserted into the top opening of the cylindrical well chamber body;

[0040] If the vertical shaft and the prefabricated well chamber are parallel and eccentrically arranged, first hoist each cover plate block to the required position, and seal and splice the cover plate blocks and seal and cover the top opening of the prefabricated well chamber; hoist the vertical shaft to the required position, and seal and insert the bottom end of the vertical shaft into the installation structure on the spliced ​​cover plate.

[0041] S3. Conduct water flow and water pressure tests on the repaired structure after installation; after passing the tests, backfill the area around the inspection well with foamed concrete to complete the repair construction.

[0042] As a further improvement to the above solution, in step S1, if the diameter of the first sleeve is larger than the original brick-built inspection well opening size, the first sleeve is first cut open and rolled up to a diameter smaller than the well opening size, then hoisted to the bottom of the well and unfolded to a preset diameter using a spreading tool, and then welded into shape; then one end of the welded first sleeve is inserted into the opening end of the mounting hole / through hole, and the other end is sealed and inserted into the corresponding drainage pipe.

[0043] As a further improvement to the above solution, if the original brick-built inspection well is also provided with a drainage branch pipe along its height direction, in step S2, the vertical well is divided into at least two sections, and an open clamp is provided at the corresponding drainage branch pipe; the vertical well sections stacked on top of each other are connected into one unit by the open clamp; and the second pipe sleeve on the open clamp is connected to the corresponding drainage branch pipe.

[0044] As a further improvement to the above solution, the following steps are included before step S1:

[0045] S01. Clean the damaged brick manhole and measure the dimensions of the original brick manhole, as well as the diameter of each drainage pipe connected to the original brick manhole and / or the diameter of each drainage branch pipe.

[0046] S02. Based on the measured dimensions, the well chamber is divided into multiple pairs of first arc-shaped blocks and at least one pair of second arc-shaped blocks;

[0047] If the shaft and chamber of the original brick well are parallel and eccentrically set, the part used to connect the shaft and chamber will be divided into a first cover plate block and / or a second cover plate block.

[0048] Based on the location of the drainage branch pipes, the vertical shaft is set into the corresponding number of sections;

[0049] The various arc-shaped blocks, cover plate blocks, and vertical shafts are formed by casting ductile iron.

[0050] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows:

[0051] This invention provides a prefabricated repair structure for circular manhole inspection wells in pipeline networks. Traditional brick manhole repairs typically require the complete demolition of the original well body and excavation down to the foundation layer, generating a large amount of construction waste and causing long-term impacts on surrounding roads, underground pipelines, and traffic. This invention adopts a fully prefabricated structure. Through the detachable and sealed connection of the prefabricated manhole base, arc-shaped blocks, and vertical well cylinder, the repair structure can be assembled directly at the original manhole opening location, minimizing disturbance to the surrounding environment and conforming to the concept of green construction. Furthermore, the prefabricated manhole, composed of arc-shaped blocks, can be flexibly adapted to the dimensions of the original manhole. By adjusting the number of splices, a cylindrical well chamber can be quickly formed, which is especially suitable for situations where the well chamber diameter is larger than the wellhead diameter. Through the modular assembly method, the arc-shaped splices can be lowered to the bottom of the well through the narrow original wellhead for assembly, thus effectively achieving trenchless repair. The base, as a bottom sealing component, is detachably and sealed to the bottom opening of the cylindrical well chamber, further simplifying the foundation positioning steps. The main structure can be built by sealing and splicing the various components. Compared with traditional cast-in-place or overall replacement processes, the construction procedures are greatly reduced, thereby effectively shortening the construction cycle and significantly improving repair efficiency.

[0052] The second arc-shaped modular body of this utility model has a "through hole or semi-through hole" structure on its side wall. The semi-through holes of adjacent modular bodies are combined to form a mounting hole of a preset diameter. Specifically, the mounting hole can be opened on-site according to the specific location of the drainage pipe at the construction site, or the location and diameter of the drainage pipe can be measured in advance and opened on the ground. In order to achieve quick and convenient on-site installation with the drainage pipe, a first sleeve is provided in the mounting hole / through hole. The first sleeve enables quick and convenient connection with the drainage pipe on site, thereby achieving the purpose of quick repair.

[0053] The vertical shaft, open at both ends, has a detachable sealed connection between its bottom and the top of the cylindrical well chamber, allowing the repair structure to be assembled in sections as needed. When the well depth is large, the height can be adjusted by stacking multiple vertical shaft sections. When local maintenance is required later, only the corresponding shaft section needs to be disassembled to expose the repair area, without having to re-excavate the entire well chamber. This "modular stacking + detachable" feature significantly improves the flexibility and maintainability of the repair structure and reduces the total life-cycle maintenance cost.

[0054] Furthermore, all components of this utility model (base, arc-shaped blocks, vertical well shaft, and first pipe sleeve) are assembled through a sealed connection method, effectively avoiding leakage problems caused by improper joint treatment in traditional repairs; and in some preferred embodiments, each joint is provided with an expansion seal, which expands with rainwater to achieve a reliable seal, ensuring that there is no leakage at the connection between the well chamber and the drainage network after repair, thus meeting the operational requirements of urban pipe network rainwater and sewage separation and sewage collection.

[0055] In summary, this utility model, through the organic combination of prefabricated structural design and modular components, completely solves the pain point of traditional brick well repair requiring excavation. It has significant advantages in terms of convenience, efficiency, economy, and long-term reliability, providing a reliable technology for the rapid repair of pipeline well chambers under trenchless conditions. Furthermore, in the subsequent maintenance process, since the splicing of each component is detachable, it is only necessary to replace the new blocks or components in the original location and then reseal and reassemble, minimizing the amount of earthwork excavation, shortening the construction period, and reducing the impact on the surrounding environment and traffic. Thus, the repair structure provided by this utility model can also reduce subsequent maintenance costs. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort, and all of them fall within the protection scope of this utility model.

[0057] Figure 1 This is a three-dimensional schematic diagram of a prefabricated repair structure (single vertical well cylinder) for a circular manhole inspection well in a pipeline network, as disclosed in Embodiment 1 of this utility model;

[0058] Figure 2 This is a front view schematic diagram of an assembled repair structure (two vertical well cylinders) for a circular manhole inspection well in a pipeline network, as disclosed in Embodiment 1 of this utility model;

[0059] Figure 3 yes Figure 2 CC-direction cross-sectional view;

[0060] Figure 4 This is a front view schematic diagram of an assembled repair structure (two vertical well cylinders) for a circular manhole inspection well in a pipeline network, as disclosed in Embodiment 1 of this utility model;

[0061] Figure 5 yes Figure 4 BB-direction sectional view;

[0062] Figure 6 This is a top view schematic diagram of the first arc-shaped assembly block disclosed in Embodiment 1 of this utility model;

[0063] Figure 7 yes Figure 6 A schematic diagram of direction D;

[0064] Figure 8 This is a partially enlarged schematic diagram of the connection between the sleeve and the second arc-shaped block as disclosed in Embodiment 1 of this utility model;

[0065] Figure 9 This is a partial schematic diagram of the connection between the pipe sleeve and the drain pipe / drainage branch pipe disclosed in Embodiment 1 of this utility model;

[0066] Figure 10 This is a three-dimensional schematic diagram of the first sleeve after welding and forming, as disclosed in Embodiment 1 of this utility model;

[0067] Figure 11 This is a front view schematic diagram of an assembled repair structure for a circular manhole inspection well in a pipeline network, as disclosed in Embodiment 2 of this utility model.

[0068] Figure label:

[0069] 1. Prefabricated well chamber; 11. Base; 12. First arc-shaped assembly; 121. First arc-shaped assembly body; 122. Connecting plate; 123. Connecting hole; 13. Second arc-shaped assembly; 131. Second arc-shaped assembly body; 132. Mounting hole; 14. Cylindrical well chamber body; 141. First sealing groove; 142. Second sealing groove; 15. Expansion seal; 16. Arc edge; 2. Vertical well shaft; 3. First pipe sleeve; 4. Spliced ​​cover plate; 41. First cover plate assembly; 42. Second cover plate assembly; 43. Installation structure; 5. Clamping device; 6. Open clamp; 7. Second pipe sleeve; 8. Third sealing groove; 9. Third sealing ring; 10. Weld; 011. U-shaped sealing ring; 012. Drainage pipe.

[0070] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0071] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0073] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0074] This utility model provides a prefabricated repair structure for a circular manhole inspection well in a pipeline network, comprising a vertically arranged prefabricated manhole 1, a vertical well cylinder 2 detachably and sealingly connected to the prefabricated manhole 1, and a first pipe sleeve 3 for connecting a drainage pipe 012; wherein, the prefabricated manhole 1 is composed of a base 11, several pairs of first arc-shaped blocks 12, and at least one pair of second arc-shaped blocks 13, and each arc-shaped block is detachably and sealingly assembled to form a cylindrical manhole body 14 with open ends, and the base 11 is detachably and sealingly connected to form a cylindrical manhole body 14 with open ends. The seal is applied to the bottom opening of the cylindrical well body 14; the side wall of the second arc-shaped block 13 is provided with a through hole or a semi-through hole, and adjacent through holes or semi-through holes are combined to form an installation hole 132 of a preset diameter. One end of the first sleeve 3 is sealed to the installation hole 132 / through hole, and the other end is used to seal the connection with the drain pipe 012; the vertical well 2 is a cylinder with openings at both ends, and its bottom opening is connected to the top opening of the cylindrical well body 14 in a detachable sealing manner; the following describes the specific implementation in different application scenarios.

[0075] Example 1

[0076] This embodiment is applicable to scenarios where the prefabricated well chamber 1 and the vertical well shaft 2 are arranged coaxially, and the diameter ratio of the two (diameter of vertical well shaft 2 / diameter of prefabricated well chamber 1) is greater than or equal to a preset value (such as 0.8);

[0077] For details, see Figures 1-10 The prefabricated well chamber 1 includes a base 11, a first arc-shaped assembly 12, and a second arc-shaped assembly 13.

[0078] First arc-shaped puzzle piece 12: See also Figure 6 and Figure 7 It includes a first arc-shaped modular body 121, with connecting plates 122 respectively provided on both sides of the body. The connecting plates 122 extend toward the center of the cylindrical well body 14 and are provided with a plurality of connecting holes 123 at intervals along the height direction. Adjacent first arc-shaped modular bodies 12 are bolted together by bolts passing through the corresponding connecting holes 123.

[0079] The second arc-shaped block 13 has a similar structure to the first arc-shaped block 12. Both sides of the block are also equipped with connecting plates 122 and connecting holes 123. The sidewalls of the block have through holes or semi-through holes (specifically, the number of second arc-shaped blocks 13 and whether to have semi-through holes or through holes on their sidewalls are determined based on the actual wellhead size and the diameter of the first casing 3; for example, if the diameter of the first casing 3 is smaller than the arc length of the second arc-shaped block 13, see [reference]). Figure 1 and Figure 3 If it is a through hole, then only one through hole needs to be made on it; otherwise, a half through hole needs to be made on it, and the half through holes of adjacent second arc-shaped blocks 13 are combined to form mounting holes 132); adjacent second arc-shaped blocks 13 are also bolted together through connecting holes 123.

[0080] Splicing and sealing: Each arc-shaped block has a groove along its two sides in the height direction, and an expansion seal 15 (such as a water-swellable rubber strip) is installed in the groove; at the same time, a first sealing connection part extends from the bottom end of each arc-shaped block, and a first groove is opened on the inner wall of the first sealing connection part; when the arc-shaped blocks are spliced ​​into a cylindrical well chamber body 14, adjacent first grooves are sealed and connected to form an annular first sealing groove 141, and an expansion seal 15 (such as an expansion water-stop ring) is installed in the first sealing groove 141 for sealing connection with the base 11;

[0081] Preferably, the base 11 is detachably and sealed at the bottom opening of the cylindrical well body 14 by means of the clamping device 5; specifically, one end of the clamping device 5 is fixedly connected to the base 11 (such as bolt connection), and the other end can adjust and clamp the arc edge 16 of the cylindrical well body 14 (the arc edge 16 is an annular protrusion extending outward from the bottom of the arc-shaped block), and the base 11 and the well body are sealed by radial compression;

[0082] Since the prefabricated well chamber 1 and the vertical well shaft 2 are coaxial and their diameter ratio is less than or equal to a preset value, the top opening of the cylindrical well chamber body 14 and the bottom opening of the vertical well shaft 2 can be directly and sealed together. Specifically, a second sealing connection part extends from the top of the prefabricated well chamber 1, and a second groove is provided on the inner wall of the second sealing connection part. When the cylindrical well chamber body 14 is assembled, each second groove is sealed together to form an annular second sealing groove 142. An expandable sealing element 15 (such as an expandable sealing strip) is provided in the second sealing groove 142. The edge of the bottom opening of the vertical well shaft 2 is embedded in the second sealing groove 142, and a sealed connection with the prefabricated well chamber 1 is achieved through the extrusion deformation of the expandable sealing element 15.

[0083] After the through hole or semi-through hole of the second arc-shaped block 13 is combined to form the mounting hole 132, one end of the first sleeve 3 is sealed and fixed to the through hole / mounting hole 132 by the U-shaped sealing ring 011, and the other end extends to the position of the drain pipe 012 and is sealed and connected to the drain pipe 012.

[0084] Traditional brick well repair typically requires the complete demolition of the existing well body and excavation down to the foundation layer, generating a large amount of construction waste and causing long-term impacts on surrounding roads, underground pipelines, and traffic. This invention employs a fully prefabricated structure. Through the detachable and sealed connection of the prefabricated well chamber 1's base 11, arc-shaped blocks, and vertical well cylinder 2, the repair structure can be assembled directly at the original wellhead location, minimizing disturbance to the surrounding environment and conforming to green construction principles. Furthermore, the prefabricated well chamber 1, composed of arc-shaped blocks, allows for flexible adjustment of the number of blocks according to the original well chamber's dimensions, enabling rapid enclosure. The cylindrical well chamber body 14 is particularly suitable for situations where the well chamber diameter is larger than the wellhead diameter. Through a modular assembly method, the arc-shaped blocks can be lowered through the narrow original wellhead to the bottom of the well for assembly, thereby effectively achieving trenchless repair. The base 11 serves as a bottom sealing component and is detachably and sealed to the bottom opening of the cylindrical well chamber body 14, further simplifying the foundation positioning steps. The main structure can be built by sealing and splicing the various components. Compared with traditional cast-in-place or overall replacement processes, the construction procedures are greatly reduced, thereby effectively shortening the construction cycle and significantly improving repair efficiency.

[0085] The second arc-shaped modular body 131 of this utility model has a "through hole or semi-through hole" structure on its side wall. The semi-through holes of adjacent modular bodies are combined to form a mounting hole 132 of a preset diameter. Specifically, the mounting hole 132 can be opened on-site according to the specific location of the drainage pipe 012 at the construction site, or the location and diameter of the drainage pipe 012 can be measured in advance and opened on the ground. In order to achieve quick and convenient on-site installation with the drainage pipe 012, a first sleeve 3 is provided in the mounting hole 132 / through hole. The first sleeve 3 enables quick and convenient connection with the drainage pipe 012 on site, thereby achieving the purpose of quick repair.

[0086] Furthermore, all components of this utility model (base 11, arc-shaped block, vertical well 2, first pipe sleeve 3) are assembled by a sealed connection method, which effectively avoids leakage problems caused by improper joint treatment in traditional repairs; and in some preferred embodiments, each joint is provided with an expansion seal 15, which expands with rainwater to achieve a reliable seal, ensuring that there is no leakage at the connection between the well chamber and the drainage pipe 012 network after repair, thus meeting the operational requirements of urban pipe network rainwater and sewage separation, sewage collection and other functions.

[0087] This utility model, through the organic combination of prefabricated structural design and modular components, completely solves the pain point of traditional brick well repair requiring excavation. It has significant advantages in terms of convenience, efficiency, economy, and long-term reliability, providing a reliable technology for the rapid repair of pipeline well chambers under trenchless conditions. Furthermore, in the subsequent maintenance process, since the splicing of each component is detachable, it is only necessary to replace the new blocks or components in the original location and then reseal and reassemble, minimizing the amount of earthwork excavation, shortening the construction period, and reducing the impact on the surrounding environment and traffic. Thus, the repair structure provided by this utility model can also reduce subsequent maintenance costs.

[0088] In a preferred embodiment, when the original brick-built inspection well has a drainage branch pipe along its height, the vertical well shaft 2 is divided into at least two sections along its height (see...). Figure 2 , Figure 4 and Figure 5 Each section of the well shaft is detachably connected to the corresponding drainage branch pipe via an open clamp 6; the open clamp 6 integrates the connection interface of the drainage branch pipe, serving both the function of fixing the well shaft sections and connecting the branch pipe.

[0089] Specifically, the clamp body of the open clamp 6 adopts a split design (i.e., two semi-circular bodies are connected by bolts or pins to form a complete ring) to fit the cylindrical outer wall of the vertical wellbore 2; the clamp body has two openings in the axial (vertical direction) direction to facilitate the axial insertion of the segmented wellbore sections into the clamp body.

[0090] The clamp body has at least one side opening in the radial direction (preferably corresponding to the position of the drainage branch pipe), and a second pipe sleeve 7 is fixedly connected to the side opening; the second pipe sleeve 7 is a hollow tubular structure, and its inner wall is detachably connected to the outer wall of the drainage branch pipe through a sealing structure.

[0091] When the upper and lower well sections are connected after being segmented, the ends of the two well sections are simultaneously inserted into the upper and lower openings of the clamp body. By tightening the connecting parts of the split body, the clamp body is radially contracted and tightly fitted to the outer wall of the well section, thus achieving a fixed connection between the well sections. At the same time, the second pipe sleeve 7 is connected to the drainage branch pipe to complete the connection of the branch pipe's drainage path.

[0092] As a preferred embodiment, in order to ensure the sealing reliability between the pipe sleeve and the well body and the drainage branch pipe, the first pipe sleeve 3 and the second pipe sleeve 7 are both made of stainless steel, which has acid and alkali corrosion resistance to adapt to the humid and corrosive environment in the sewage well and extend its service life.

[0093] See Figure 8 and Figure 9Each pipe sleeve has a U-shaped sealing ring 011 at one end of the corresponding opening, and the outer wall of the other end is also provided with a sealing structure for detachable sealing connection with the corresponding drain pipe 012 / drain branch pipe.

[0094] The sealing structure includes a third sealing groove 8 disposed on the outer wall of the other end of the sleeve, and a third sealing ring 9 disposed in the third sealing groove 8; preferably, the third sealing ring 9 is a toothed sealing ring, which can achieve effective sealing with the corresponding drain pipe 012 / drain branch pipe to prevent leakage.

[0095] The toothed sealing ring has multiple raised teeth on its outer periphery. When it comes into contact with the inner wall of the drain pipe 012 / drain branch pipe, the toothed meshing action increases the friction force and fills the tiny gap between the pipe sleeve and the drain pipe 012 / drain branch pipe, preventing leakage caused by pipe deformation or vibration. Compared with ordinary O-rings, the toothed sealing ring has a more uniform sealing pressure distribution and stronger axial tensile resistance, making it suitable for dynamic sealing scenarios with non-rigid connections.

[0096] Specifically, one end of the first sleeve 3 is provided at the through hole / mounting hole 132 on the second arc-shaped block body 131 through a U-shaped sealing ring 011; the other end is sealed to the corresponding drain pipe 012 through the sealing structure.

[0097] One end of the second pipe sleeve 7 is set at the corresponding clamp side opening through a U-shaped sealing ring 011, and the other end is sealed to the corresponding drainage branch pipe through the sealing structure to prevent sewage from leaking from the gap of the pipe sleeve.

[0098] As a preferred embodiment, the arc-shaped assembly, the cover plate assembly, and the vertical shaft 2 body are all made of ductile iron. Ductile iron has high strength, good toughness, and excellent corrosion resistance (which can be further improved by surface epoxy resin coating or hot-dip galvanizing treatment). It is suitable for the humid and heavy-duty environment of inspection wells. Compared with traditional brick masonry structures, it can effectively avoid problems such as shaft cracking and leakage.

[0099] Example 2

[0100] See Figure 11 This embodiment is applicable to scenarios where the vertical shaft 2 and the prefabricated well chamber 1 are parallel but not coaxial (eccentricity ≤ preset value), and the diameter ratio of the two (diameter of vertical shaft 2 / diameter of prefabricated well chamber 1) is less than a preset value (e.g., 0.8).

[0101] The structure of the prefabricated well chamber 1 in this embodiment is basically the same as that in embodiment 1, including a base 11, a first arc-shaped assembly 12 and a second arc-shaped assembly 13. The splicing method of each arc-shaped assembly (bolted by connecting plate 122 and sealed by expansion seal 15 in groove) and the fixing method of the clamp 5 of the base 11 are the same as those in embodiment 1.

[0102] Because the vertical shaft 2 and the prefabricated well chamber 1 are parallel and eccentric, they cannot be directly connected by sealing the top edge. Therefore, in this embodiment, a spliced ​​cover plate 4 is used to achieve a sealed connection between the two.

[0103] Specifically, the splicing cover plate 4 includes at least a first cover plate block 41 and a second cover plate block 42 that are set in opposite directions. The two blocks can be disassembled and sealed by bolts passing through the connecting holes 123 to form a ring structure that is compatible with the top opening of the prefabricated well chamber 1.

[0104] At least one cover plate assembly (such as the second cover plate assembly 42) is provided with an installation structure 43 (such as an annular boss or flange interface) adapted to the bottom end of the vertical shaft 2 for fixing the bottom end of the vertical shaft 2.

[0105] The specific sealing connection process is as follows: First, the bottom end of the vertical shaft 2 is fixed to one of the cover plate blocks (such as the second cover plate block 42) through the installation structure 43; then, the two cover plate blocks are fastened to the top opening of the prefabricated well chamber 1 and spliced ​​by bolts; finally, an expansion seal 15 is set at the joint between the cover plate block and the top of the prefabricated well chamber 1, and a sealing gasket is set on the contact surface between the vertical shaft 2 and the cover plate block to ensure the overall sealing performance.

[0106] In this embodiment, the installation method of the mounting hole 132 of the second arc-shaped block 13 and the first sleeve 3 is the same as in embodiment 1; the expansion seal 15 at the joint of each arc-shaped block and in the side groove is also the same as in embodiment 1, to ensure the sealing of the well chamber itself.

[0107] In this embodiment, when a drainage branch pipe is provided in the height direction of the original brick-built inspection well, the vertical well 2 is divided into at least two sections along the height direction. The method of detachable connection of each section of the well with the corresponding drainage branch pipe through the open clamp 6 is the same as in Embodiment 1. The selection of materials for each pipe sleeve and the sealing connection method with each pipe sleeve and the opening, as well as the sealing connection method between each sleeve and the drainage pipe 012 / drainage branch pipe, are all the same as in Embodiment 1, and will not be repeated here.

[0108] This utility model optimizes the sealing connection structure between the prefabricated manhole 1 and the vertical shaft 2 for different diameter ratios and axial relationships (coaxial / eccentric) through different embodiments: direct edge sealing is adopted in the coaxial small diameter ratio scenario, and indirect sealing is adopted in the eccentric small diameter ratio scenario, with spliced ​​cover plate 4. It takes into account both assembly efficiency and sealing reliability, and is suitable for the repair needs of vertical manholes in pipelines under different working conditions.

[0109] Example 3

[0110] This utility model also provides a repair construction method for a prefabricated repair structure of a circular manhole in a pipeline network, as described in Embodiment 1 or Embodiment 2. This method is applicable to scenarios where brick manholes require rapid repair due to damage, leakage, or structural failure. This utility model achieves efficient construction, good sealing, and structural stability through modular assembly, sealed connections, and adaptive structural adjustments. The following details the specific steps and improvement scheme:

[0111] I. Pre-construction preparations (S01-S02)

[0112] S01. Preliminary Cleaning and Measurement

[0113] First, the damaged brick manholes are cleaned: the broken brickwork, loose mortar layers, and deposited silt and debris inside the manhole are removed. The manhole walls and bottom are washed with a high-pressure water gun to ensure that there are no residual obstacles and the surface is smooth. Then, using measuring tools such as a laser rangefinder, tape measure, and total station, the key dimensions of the original brick manhole are measured comprehensively, including: the inner diameter of the manhole, the depth of the manhole, and the eccentricity distance between the manhole shaft and the manhole axis. At the same time, the outer diameter, center elevation, and direction of each drainage pipe (012) connected to the manhole are measured, as well as the position coordinates, outer diameter, and connection angle of drainage branch pipes (if any). The measurement data must be recorded and archived as the basis for subsequent component processing.

[0114] S02, Component Prefabrication and Processing

[0115] Based on the measurement data from step S01, the core components of the prefabricated repair structure are prefabricated in a factory:

[0116] Specifically, the main body of the well chamber is divided as follows: based on the inner diameter and circumference of the well chamber, the well chamber is evenly divided into multiple pairs of first arc-shaped blocks 12 along the circumferential direction; if the well chamber has a corresponding drainage pipe 012 that needs to be connected, then at least one pair of second arc-shaped blocks 13 are further divided (so that corresponding through holes or semi-through holes can be opened on its outer wall in advance or later).

[0117] Cover plate segmentation: If the original shaft is parallel to and eccentrically set with the shaft chamber axis, the opening area at the top of the shaft chamber is divided into the first cover plate segment 41 and the second cover plate segment 42 (covering the eccentric area) to ensure that the top is flat after splicing.

[0118] Vertical shaft 2 segmentation: According to the location of the drainage branch pipe (if any), the vertical shaft 2 is divided into at least two segments along the height direction, each segment corresponding to the location of a drainage branch pipe, and an opening clamp 6 installation position is preset at the segment interface;

[0119] Casting: All arc-shaped blocks, cover plate blocks and vertical shaft 2 are made of ductile iron. During casting, installation holes 132, bolt holes and sealing grooves are reserved. After casting, the surface of the parts is polished to remove burrs and coated with anti-rust primer.

[0120] II. Core Repair Construction Steps (S1-S3)

[0121] S1. Assembly and connection of the main body of the well chamber

[0122] Lifting and support of base 11: Lift base 11 to the bottom of the well and adjust the elevation of the top surface of base 11 using a level to ensure that base 11 is level and stable;

[0123] Arc-shaped block hoisting and splicing: hoist each arc-shaped block to the bottom of the well in sequence, align the connecting holes 123 on the connecting plates 122 of adjacent blocks and then bolt them together to form a cylindrical well chamber body 14 with open ends; during the splicing process, the gaps between the blocks are filled with expansion seals 15 to ensure overall sealing.

[0124] Connection between the cylindrical well body 14 and the base 11: After the cylindrical well body 14 is assembled, align its bottom end with the annular protrusion on the top surface of the base 11, and detachably fasten the connection by clamping device 5 or bolts to ensure that there is no relative displacement between the well body and the base 11.

[0125] Drainage pipe 012 connection: A U-shaped sealing ring 011 is installed at the preset installation hole 132 (corresponding to the position of drainage pipe 012) on the side wall of the cylindrical well body 14. The first pipe sleeve 3 is passed through the installation hole 132, so that the U-shaped sealing ring 011 is installed in the gap between the installation hole 132 and the pipe sleeve. Then, the other end of the first pipe sleeve 3 is inserted into the corresponding drainage pipe 012. If the diameter of the first pipe sleeve 3 is larger than the outer diameter of the drainage pipe 012, a water-swellable sealing ring can be filled between the pipe sleeve and the drainage pipe 012 to ensure a seal.

[0126] Special case handling: If the diameter of the first pipe sleeve 3 is larger than the original brick-built inspection well opening size, first cut the first pipe sleeve 3 axially and roll it up to a diameter smaller than the well opening size. After hoisting it to the bottom of the well, use a hydraulic expander to expand the pipe sleeve to the preset diameter (matching the outer diameter of the drainage pipe 012). Then weld the expanded part into shape (see...). Figure 10 A weld 10 is formed on the first sleeve 3, and finally the insertion and sealing with the drain pipe 012 is completed.

[0127] S2. Top structure assembly and connection

[0128] Implement in two cases according to the relative position relationship between the well chamber main body and the vertical shaft 2:

[0129] Case 1: Coaxial setting: When the axis of the well chamber main body coincides with the axis of the vertical shaft 2, hoist the vertical shaft 2 directly above the top opening of the well chamber main body. Adjust the verticality of the vertical shaft 2 by hanging a line so that its bottom end aligns with the annular flange of the top opening of the well chamber main body. Fasten and connect the two with flange bolts to ensure that there is no step at the joint;

[0130] Case 2: Eccentric setting: When the axis of the well chamber main body is parallel but eccentric to the axis of the vertical shaft 2, first hoist each cover plate piece above the top opening of the well chamber main body. Align the alignment holes of the cover plate pieces with the top opening of the well chamber main body and initially fix them. After adjusting the levelness of the cover plate pieces, further fasten and connect them to form a sealed splicing cover plate structure. Subsequently, hoist the vertical shaft 2 above the cover plate structure. Align the bottom end of the vertical shaft 2 with the installation structure 43 on the cover plate and fasten and connect them with high-strength bolts to ensure that the vertical shaft 2 fits tightly with the cover plate;

[0131] Handling of special cases: If the original shaft has a drainage branch pipe along the height direction, divide the vertical shaft 2 into at least two sections (the height of each section matches the distance between the branch pipes) according to the position of the branch pipe. Set an open hoop 6 at the segmented interface. The vertically stacked sections of the vertical shaft 2 are fastened and connected by the bolts of the open hoop 6, and the second pipe sleeve 7 on the hoop is inserted into the corresponding drainage branch pipe to ensure the tightness of the connection at the branch pipe.

[0132] S3. Water passing test, water pressure test and backfilling

[0133] Water passing test: Inject clear water into the repaired inspection well and observe for 30 minutes. Check that there is no leakage at the splicing seams of the arc-shaped pieces, the pipe sleeve interfaces and the connections between the drainage pipe 012 / drainage branch pipes;

[0134] Water pressure test (only for the pressure drainage system): Close the outlet of the drainage pipe 012, pressurize the well to the design pressure through a water pump, hold the pressure for 30 minutes. It is qualified if the pressure drop ≤ 0.02MPa and there is no leakage at all splicing seams and pipe connection joints;

[0135] Backfilling with foamed concrete: After the test is qualified, use C30 fine aggregate concrete (or foamed concrete) to backfill the periphery of the inspection well in layers. After backfilling to the original ground elevation, cover the surface with medium coarse sand.

[0136] This utility model achieves efficient and sealed repair of vertical manhole inspection wells through preliminary measurement and prefabrication, modular assembly and connection, and adaptive structural adjustment; customized prefabrication of components improves adaptability, modular splicing shortens the construction cycle, multiple sealing designs ensure seepage prevention performance, and segmented adjustable structure adapts to complex pipe network environments, ultimately resulting in a stable, durable and reliable repair effect.

[0137] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A fabricated repair structure for a round manhole of a pipe network, characterized in that, It includes a vertically arranged prefabricated well chamber, a vertical well cylinder that is detachably connected to the prefabricated well chamber, and a first sleeve; The prefabricated well chamber includes a base, several pairs of first arc-shaped panels and at least one pair of second arc-shaped panels. The multiple arc-shaped panels can be detachably and sealed together to form a cylindrical well chamber body with openings at both ends. The base can be detachably and sealed to block the bottom opening of the cylindrical well chamber body. The second arc-shaped module includes a second arc-shaped module body, and a through hole or a semi-through hole is provided on the side wall of the second arc-shaped module body. Adjacent semi-through holes can be combined to form a mounting hole of a preset diameter. One end of the first sleeve is sealed to the mounting hole / through hole, and the other end is used to seal to the corresponding drain pipe; The vertical shaft is a cylinder with openings at both ends, and its bottom opening is detachably and sealed to the top opening of the main body of the cylindrical well chamber.

2. A fabricated repair structure for a round manhole of a pipe network according to claim 1, characterized in that, Each arc-shaped block extends from its bottom end to a first sealing connection part, and the inner wall of the first sealing connection part is provided with a first groove; Each of the first grooves is sealed together to form a first sealing groove when the cylindrical well body is assembled; an expandable sealing element is provided in the first sealing groove for sealing connection with the base.

3. The prefabricated repair structure for a circular manhole inspection well in a pipeline network according to claim 1 or 2, characterized in that, If the vertical shaft and the prefabricated well chamber are coaxially arranged, and the diameter ratio between the two is greater than or equal to a preset value; Each arc-shaped block extends a second sealing connection at its top, and the inner wall of the second sealing connection is provided with a second groove; Each of the second grooves is sealed and joined together to form a second sealing groove when the main body of the cylindrical well chamber is assembled; an expandable sealing element is provided in the second sealing groove to achieve a sealed connection with the vertical well barrel.

4. A modular rehabilitation structure for a round manhole of a pipe network according to claim 1 or 2, characterized in that, If the axes of the vertical shaft and the prefabricated well chamber are parallel and eccentrically arranged, and the diameter ratio between the two is less than a preset value; The bottom end of the vertical shaft is detachably connected to the top end of the prefabricated well chamber via a spliced ​​cover plate.

5. A modular rehabilitation structure for a round manhole of a pipe network according to claim 4, characterized in that, The spliced ​​cover plate includes at least a first cover plate assembly and a second cover plate assembly that are split in half; The first cover plate assembly and the second cover plate assembly are detachably and sealed together to form a shape that fits the top opening of the prefabricated well chamber; At least one cover plate assembly is provided with an installation structure adapted to be installed and plugged into the bottom end of the vertical shaft.

6. A fabricated repair structure for a round manhole of a pipe network according to claim 1 or 2, characterized in that The first arc-shaped puzzle piece includes a first arc-shaped puzzle piece body and connecting plates respectively disposed on both sides of the first arc-shaped puzzle piece body; the second arc-shaped puzzle piece body is also provided with the connecting plates on both sides. Each of the connecting plates extends toward the center of the cylindrical well body; Each connecting plate is provided with a number of connecting holes spaced apart along its height direction; The adjacent first arc-shaped panels, the adjacent second arc-shaped panels, and the first and second arc-shaped panels are detachably bolted together in pairs through corresponding connecting holes.

7. A modular rehabilitation structure for a round manhole of a pipe network according to claim 1 or 2, characterized in that, If the original brick-built inspection well is also equipped with a drainage branch pipe along its height direction, the vertical well is divided into at least two sections, and an open clamp is installed at the corresponding drainage branch pipe. The vertical well sections stacked on top of each other are connected into one unit by the open clamp. The open clamp includes a clamp body that is split in half and has two openings arranged axially, and at least one side opening arranged radially. A second pipe sleeve is provided at the side opening for connecting a drainage branch pipe.

8. The prefabricated repair structure for a circular manhole inspection well in a pipeline network according to claim 7, characterized in that, One end of each sleeve is fitted with a sealing ring at the corresponding opening; Its other end of the outer wall is also provided with a sealing structure for detachable and sealed connection with the corresponding drain pipe / drain branch pipe; The sealing structure includes a third sealing groove disposed on the outer wall of the other end of the sleeve, and a third sealing ring disposed within the third sealing groove.

9. A fabricated repair structure for a round manhole of a pipe network according to claim 5, characterized in that, Each arc-shaped assembly, cover plate assembly, and vertical shaft is made of ductile iron.

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