Inspection well repairing device and inspection well repairing method

Abstract

The invention discloses an inspection well repairing device and method. The inspection well repairing device comprises a bottom supporting mechanism and a side supporting mechanism. The side supporting mechanism comprises an inner supporting support, a fence and a movable module, a filling cavity is formed between the inner supporting support and the fence, the diameter of the fence can be adjusted after the movable module is inserted, and a uniform pouring cavity is formed. Wherein the movable module can be defined into a cylinder through the array plug connectors and is matched with a circular inspection well; or V-shaped columns are connected to form a polygon in a surrounding mode, and the polygon is matched with a non-circular inspection well. The problems that a traditional formwork is difficult to position and the thickness of a pouring layer is uneven are solved, the formwork is suitable for repairing inspection wells of various shapes and sizes, and the strength reliability of a repairing structure is improved.

Description

Technical Field

[0001] This application relates to the field of manhole repair technology, and in particular to manhole repair devices and methods. Background Technology

[0002] Inspection wells are important structures in urban underground pipe networks, commonly located in municipal roads, residential areas, and other public areas, serving functions such as pipe connection, flow direction conversion, and inspection and maintenance. Due to long-term exposure to ground loads, soil pressure, groundwater erosion, and internal fluid scouring and chemical corrosion, the well walls and shaft structures are prone to cracking, spalling, and leakage, and in severe cases, local collapse may occur. These defects can lead to groundwater seepage or sewage leakage, affecting the stability of the surrounding soil and environmental safety.

[0003] In the maintenance of urban underground pipe networks, in-situ non-excavation casting repair of old manholes is a common method. However, existing repair techniques generally suffer from difficulties in template installation and positioning. Especially when dealing with manholes with irregular shapes and inconsistent sizes, traditional templates are difficult to maintain a stable position inside the manhole, and the gap between them and the original manhole wall is also difficult to control properly, thus affecting the thickness of the reinforcement layer formed after casting.

[0004] Existing rigid formwork has limited ability to adapt to changes in well wall contours, and its simple support structure easily leads to uneven thickness after the lining is poured. Areas with insufficient thickness may form new weak points, while excessively thick areas increase material consumption and further occupy space within the well, affecting the structural effect and performance after repair. Summary of the Invention

[0005] To address the shortcomings of traditional templates, such as difficulty in positioning within irregular manholes, unstable support, and difficulty in forming a pouring space with controllable thickness, this application provides a manhole repair device and a manhole repair method.

[0006] The inspection well repair device provided in this application adopts the following technical solution: Inspection well repair equipment, including; A bottom support mechanism, used to be inserted into the inspection well; The side support mechanism includes an inner support bracket disposed on the bottom support mechanism, a enclosure sleeved around the outer periphery of the inner support bracket, and a movable module. A filling cavity is formed between the inner support bracket and the enclosure for the insertion of the movable module; The movable module is used to support the enclosure to form a pouring cavity for cement injection between the enclosure, the bottom support mechanism and the inner wall of the inspection well.

[0007] By adopting the above technical solution, a highly controllable and uniform pouring cavity is formed. By inserting different numbers of movable modules, the outer diameter of the enclosure can be precisely adjusted, making it suitable for various irregular old well walls. It can form a relatively uniform annular pouring cavity, ensuring the consistency of the concrete lining thickness and the reliability of the structural strength.

[0008] Preferably, the active module includes a plurality of array connectors for insertion into the filling cavity, the plurality of array connectors surrounding the inner support bracket and being distributed in a cylindrical shape, and the enclosure surrounding the periphery of the plurality of array connectors to adjust the diameter of the support enclosure.

[0009] By adopting the above technical solution, the diameter of the enclosure can be adjusted within a certain range by adding, removing, or replacing the array connectors, making it easier to meet the design requirements for the thickness of the formed casting cavity. Multiple connectors form a circumferential support ring, improving the uniformity of stress on the enclosure, reducing the possibility of local deformation, and facilitating a smoother inner surface for the casting. The modular connector method facilitates rapid underground assembly and adjustment, and reduces dimensional limitations on the overall template during transportation and handling.

[0010] Preferably, the bottom support mechanism includes a lower support frame and a bottom tray disposed on the lower support frame.

[0011] By adopting the above technical solutions, the bottom support structure can transfer the load generated by the side support mechanism and the enclosure to the bottom of the inspection well, making the overall stress more stable. The bottom tray provides bottom bearing and sealing functions, increasing the support contact area and reducing local pressure on the one hand, and reducing the possibility of slurry leakage from the bottom on the other. The split structure facilitates sequential installation in confined spaces, helping to reduce component weight and improve the operability of downhole operations.

[0012] Preferably, the bottom tray is provided with a plug-in limiting groove for inserting the array plug-in component.

[0013] By adopting the above technical solution, the bottom end of the array connector engages with the limiting groove, providing position guidance during the installation phase and enabling the connectors to form a relatively stable arrangement in the circumferential direction. This engagement structure reduces the possibility of horizontal displacement or rotation of the connectors during the stress process and improves the overall stability of the bottom support ring, which is beneficial to improving the stress uniformity and structural condition of the formwork during the pouring stage.

[0014] Preferably, the internal support frame includes a main frame, a group of support brackets spaced apart along the length of the main frame, and a support plate surrounding the group of support brackets.

[0015] By adopting the above technical solutions, the multi-level support structure consisting of the main frame, support group, and support plate is beneficial for dispersing radial and axial loads, enabling the internal support to maintain a relatively stable stress state during the casting process. The support plate provides surface contact support, making the load distribution of the array connectors more uniform, reducing local stress concentration, and helping to improve the stress uniformity and structural stability of the overall support system.

[0016] Preferably, the support assembly includes side frames arranged in a cross shape, and corner frames arranged in a star shape with the side frames. The ends of the side frames are connected to the middle of the support plates, and the ends of the corner frames are connected to the joint of the two support plates.

[0017] By adopting the above technical solution, the support structure formed by the cross-shaped side frames and the star-shaped corner frames can provide distributed support to different areas of the support plate, thus suppressing the deformation tendency of the support plate under stress. The arrangement of the corner frames allows the loads from the edges and connection points of the support plate to be transferred more directly to the center, which helps to improve the distribution of internal forces in the structure. With similar material usage, this combined support method is beneficial to improving the radial stiffness and overall stress stability of the structure.

[0018] Preferably, the array connector is in the shape of a cuboid.

[0019] By adopting the above technical solution, the array connector is preferably in the shape of a cuboid, which is suitable for the repair of circular inspection wells; for inspection wells with a tapered shape, the array connector can be in the shape of an arc, with its inner wall curvature matching the outer wall curvature of the support plate of the inner support bracket, and its outer wall curvature matching the inner wall curvature of the enclosure.

[0020] By adopting the above technical solution, the cuboid connector is simple to process, suitable for mass production, easy to maintain dimensional consistency, and conducive to forming a more uniform support effect during assembly. Its planar contact shape increases the stress-bearing area, reduces local pressure, and decreases the possibility of the connector rolling or tilting under stress, thereby improving the stability of the support. Furthermore, the cuboid shape facilitates storage and transportation, reducing space occupation and related costs during storage and handling.

[0021] This application also provides another inspection well repair device, including Bottom support mechanism; The side support mechanism includes an inner support bracket disposed on the bottom support mechanism, a enclosure sleeved around the outer periphery of the inner support bracket, movable modules, and V-shaped columns; the V-shaped columns are used to connect two movable modules so that the multiple movable modules are arranged into a polygon. A filling cavity is formed between the inner support bracket and the enclosure for the insertion of the movable module; The movable module is used to support the enclosure to form a pouring cavity for cement injection between the enclosure, the bottom support mechanism and the inner wall of the inspection well.

[0022] By adopting the above technical solution, V-shaped columns can connect multiple movable modules into a stable polygonal frame, such as nonagonal, hexagonal, and heptagonal shapes. This allows the side bracing mechanism to form a casting cavity with a polygonal cross-section.

[0023] Preferably, the inner side of the V-shaped column is provided with a pre-installed screw for threaded connection with the side of the movable module.

[0024] By adopting the above technical solution, the pre-installed screw not only enables the rapid connection between the movable module and the V-shaped column, but also restricts the horizontal displacement of the movable module during the pouring process, ensuring the stability of the polygonal support frame, simplifying the on-site assembly process of the polygonal frame, improving construction efficiency, and guaranteeing the strength of the connection nodes.

[0025] The present invention also provides a method for repairing inspection wells, the method applying the inspection well repair device described above, the method comprising the following steps: S1: Construction preparation: First, seal off other passages inside the manhole, dredge the bottom of the manhole, and clean the inner wall of the manhole to remove surface deposits and loose layers. S2: Inspection of manholes, selecting a movable template that matches the inner wall contour of the manhole and a V-shaped column for connecting and fixing the movable template; S3: First stage of repair, a side support mechanism is built inside the inspection well, followed by the first and second grouting; the repair height range is 0-2.0m; S4: Second stage of repair, continue to build side support mechanisms on the existing side support mechanism, and then carry out the third and fourth grouting; the repair height range is increased by 2m on the original repair height; S5: Repeat the operation method of step S4, and carry out the subsequent stages of repair in sequence until the repair height range covers the depth of the inspection well; S6: Treat the grouting port; S7: Remove the side bracing mechanism; S8: The repair work is completed. The repaired inspection well is inspected and accepted to complete the repair work.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By adjusting the number or specifications of the active modules, the outer diameter of the enclosure can be changed, so that a pouring space that meets the design requirements can be formed between the enclosure and the inner wall of the inspection well, thereby helping to obtain a concrete lining structure with a relatively uniform thickness. 2. The internal support frame, together with the movable module, the enclosure and the bottom support mechanism, constitutes the force transmission path, providing circumferential support for the enclosure during the pouring stage, reducing the possibility of displacement or local deformation under pressure, thereby improving the structural stability of the pouring process; 3. The activity module adopts a modular structure, which allows the diameter of the enclosure to be adjusted within a certain range. There is no need to manufacture integral templates for different well diameters, making it easy to apply to inspection wells of various sizes and helping to reduce the complexity of manufacturing and construction.

[0027] 4. A repair device for non-circular casting cavities is provided. This solves the problem of repairing non-circular or polygonal manholes after severe local deformation or collapse. Depending on the shape of the manhole, movable modules are used to splice them into the corresponding polygonal shape for casting repair.

[0028] 5. By using a layered pouring method, the pressure exerted by the concrete on the side bracing mechanism during a single pour is significantly reduced. This avoids the risk of formwork deformation, displacement, or even collapse due to excessive pressure during a single pour, thus ensuring the structural stability at each stage. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the inspection well repair device of this application.

[0030] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 1 of the inspection well repair device of this application.

[0031] Figure 3 This is a flowchart illustrating the steps of the inspection well repair method according to Embodiment 1 of this application; Figure 4 This is a three-dimensional structural schematic diagram of Embodiment 2 of this application; Figure 5 This is a top view of Embodiment 2 of this application; Figure 6 This is a cross-sectional view of the inspection well according to Embodiment 2 of this application; Figure 7 This is a flowchart illustrating the steps of the inspection well repair method according to Embodiment 2 of this application.

[0032] Explanation of reference numerals in the attached figures: 1. Bottom support mechanism; 11. Lower support frame; 12. Bottom tray; 13. Insertion limiting groove; 121. Center tray; 122. Fan-shaped tray; 123. Lower pressing part; 124. Upper pressing part; 2. Side support mechanism; 21. Internal support bracket; 22. Enclosure; 23. Movable module; 24. V-shaped column; 25. Pre-installed screw; 211. Main frame; 212. Support group; 213. Support plate; 214. Side frame; 215. Corner frame; 231. Array plug-in component; 3. Filling cavity; 4. Casting cavity; 5. Inspection well. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1 to 3 This application will be described in further detail.

[0034] Embodiment 1 of this application discloses a manhole repair device. (Refer to...) Figure 1 and Figure 2 Inspection well repair device, including; Bottom support mechanism 1, which is used to be inserted into the inspection well; The side support mechanism 2 includes an inner support bracket 21 mounted on the bottom support mechanism 1, a enclosure 22 sleeved around the inner support bracket 21, and a movable module 23. A filling cavity 3 is formed between the inner support bracket 21 and the enclosure 22 for the insertion of the movable module 23; The active module 23 is used to support the enclosure 22 to form a pouring cavity 4 for cement injection between the enclosure 22, the bottom support mechanism 1 and the inner wall of the inspection well.

[0035] The manhole repair device of this application can improve the problems of inaccurate positioning and unstable support of traditional templates in irregular manholes. By selectively adding or removing movable modules 23 in the filling cavity 3 between the inner support bracket 21 and the enclosure 22, the outer diameter of the enclosure 22 can be adjusted, thereby forming an annular pouring cavity 4 with controllable thickness between the enclosure 22, the bottom support mechanism 1, and the inner wall of the manhole. This structure helps to form a more uniform pouring cavity under various irregular old manhole wall conditions, resulting in better stability of the final poured concrete lining layer in terms of thickness distribution and structural strength.

[0036] As another embodiment, the movable module 23 can also be an inflatable airbag surrounding the inner support bracket 21. By filling or releasing gas into the airbag, its radial expansion dimension can be directly controlled, thereby pushing the enclosure 22 outward to adjust and support the diameter of the enclosure 22.

[0037] Furthermore, the active module 23 includes a plurality of array connectors 231 for insertion into the filling cavity 3. The plurality of array connectors 231 surround the inner support bracket 21 and are distributed in a cylindrical shape. The enclosure 22 surrounds the outer periphery of the plurality of array connectors 231 to adjust the diameter of the supporting enclosure 22.

[0038] This application specifically implements the active module 23 as an array of plug-in components 231 arranged circumferentially around the inner support bracket 21. This arrangement facilitates adjustment of the radial position of the enclosure 22, thereby improving the dimensional control of the casting cavity 4.

[0039] First, by increasing or decreasing the number of array connectors 231 in the filling cavity 3, or by selecting connectors of different specifications, the outer diameter of the enclosure 22 can be adjusted more precisely, so that the diameter of the cylindrical surface formed by the enclosure 22 can adapt to various manhole inner wall shapes from standard circles to slightly out-of-roundness, which is beneficial to improving the consistency of thickness control of the pouring cavity 4.

[0040] Secondly, multiple array connectors 231 are arranged in a ring around the inner support bracket 21, so that the enclosure 22 can obtain relatively uniform back support throughout the entire circumference, which can reduce the risk of deformation caused by insufficient local support, thereby enabling the enclosure 22 to maintain a more stable support state under slurry pressure.

[0041] In addition, the modular configuration of the array connector 231 facilitates rapid assembly and adjustment downhole, and the number and position of the array can be flexibly changed on site as needed. It is easy to install and disassemble, and is more suitable for operation in confined spaces compared to the integrated template system.

[0042] As another embodiment, the array connector 231 is a strip-shaped module with a trapezoidal cross-section. Multiple trapezoidal connectors can be assembled to naturally form a frustum-shaped support surface, which is particularly suitable for the repair support of inspection well casings with tapered surfaces.

[0043] Furthermore, the bottom support mechanism 1 includes a lower support frame 11 and a bottom tray 12 disposed on the lower support frame 11.

[0044] The bottom support mechanism 1 of this application can achieve stable force flow transmission and load distribution. The lower support frame 11, as the bottom load-bearing component, can transfer the weight of the side support mechanism 2, the enclosure 22, and the grout before pouring to the bottom of the inspection well, thereby reducing the possibility of the device sinking under gravity.

[0045] The bottom tray 12 provides a relatively wide and flat bearing surface. On the one hand, it supports the inner support bracket 21, increases its contact area with the bottom of the well, reduces local pressure, and reduces the impact on the bottom structure. On the other hand, the bottom tray 12 and the enclosure 22 together form the bottom closed structure of the casting cavity 4, which helps to reduce slurry leakage and maintain the integrity of the inner substrate bottom molding.

[0046] Furthermore, the bottom tray 12 adopts a split structure, allowing the bottom support mechanism 1 and the side support mechanism 2 to be transported and installed in stages. When the wellhead size is limited, each component can be placed into the well one by one and assembled at the bottom of the well, thereby reducing the weight of individual components and the difficulty of installation, and improving the feasibility of downhole operations.

[0047] Furthermore, the bottom tray 12 is provided with a plug-in limiting groove 13 for inserting the array plug-in 231.

[0048] This application achieves the positioning and anti-displacement functions of the array connector 231 by setting the insertion limiting groove 13. The bottom end of each array connector 231 is inserted into the corresponding insertion limiting groove 13, so that the initial installation position of the connector in the circumferential direction is stable, reducing the possibility of horizontal sliding or rotation during operation, and maintaining the structural position when subjected to the impact of slurry flow during the pouring process.

[0049] The insertion limiting groove 13 also provides clear guidance for installation, enabling the array of plug-in components 231 to be arranged according to the preset position, facilitating quick layout by construction personnel and reducing reliance on experience during installation. The insertion limiting groove 13 forms a mechanical interlocking relationship with the bottom tray 12, transitioning the contact between the plug-in component and the bottom tray from surface contact to mechanical engagement, thereby enhancing the overall rigidity of the bottom support and improving the stability of the connection between the support ring formed by the array of plug-in components 231 and the bottom structure. This is beneficial for improving the overall stability of the side support mechanism during the pouring stage.

[0050] Furthermore, the internal support 21 includes a main frame 211, support groups 212 spaced apart along the length of the main frame 211, and a support plate 213 surrounding the support groups 212.

[0051] The technical advantages of this application are reflected in structural strength, force transmission method, and ease of construction. The internal support bracket 21 consists of a three-level structure composed of a main frame 211, support groups 212, and support plates 213, forming a spatial support frame. The main frame 211, as a load-bearing component, bears the axial load; the support groups 212, arranged at intervals along the height direction, disperse the external pressure in the height direction, reducing stress concentration; the support plates 213, as a continuous bearing surface, absorb and transmit the radial pressure from the array connectors 231, so that the force flow forms a stable transmission path between the main frame 211 and the support groups 212.

[0052] The above structural arrangement ensures that the internal support 21 maintains its structural state during the casting stage, reducing the possibility of buckling or local deformation. The surface contact structure of the support plate 213 ensures that the array connectors 231 fit stably on its surface, reducing the pressure in local contact areas, improving load distribution, and making the support effect more uniform.

[0053] In addition, the modular structure formed by the main frame 211, the support group 212 and the support plate 213 facilitates mass production in the factory and supports rapid on-site assembly, thereby improving the applicability of the overall structure in construction scenarios.

[0054] Furthermore, the support assembly 212 includes side frames 214 arranged in a cross shape, and corner frames 215 arranged in a star shape with the side frames 214. The ends of the side frames 214 are connected to the middle of the support plate 213, and the ends of the corner frames 215 are connected to the connection point of the two support plates 213.

[0055] The internal support frame 21, consisting of side frames 214 and corner frames 215, forms a support structure to enhance the overall rigidity of the support plate 213. The side frames 214 are arranged in a cross shape, supporting the central area of ​​the support plate 213; the corner frames 215 form a star-shaped arrangement with the side frames 214, allowing loads from different areas of the support plate 213 to be transferred to the main frame 211. This composite structure divides the back of the support plate 213 into multiple load-bearing areas, improving the support plate's resistance to deformation during the casting stage and ensuring structural stability under the lateral pressure of the grout.

[0056] The arrangement of the corner brackets 215 optimizes the force transmission path, allowing loads from the edges and connection points of the support plate 213 to be transferred to the main frame 211 via a shorter path, reducing internal force concentration and improving the load-bearing efficiency and structural stability of the inner support brackets 21. Compared with using only a single cross or ring support structure, this composite arrangement increases the radial support stiffness under the same material conditions, which is beneficial for maintaining the morphological accuracy of the enclosure structure during the casting stage.

[0057] Furthermore, the array connector 231 is rectangular. Alternatively, in this embodiment, the array connector 231 is arc-shaped, with its inner wall curvature matching the outer wall curvature of the support plate 213 of the inner support bracket 21, and its outer wall curvature matching the inner wall curvature of the enclosure 22. This shape provides a larger contact area, making the support more stable.

[0058] This application uses a cuboid-structured array connector 231, which has certain advantages in production, assembly, and use. The cuboid structure is suitable for mass production through common processes such as cutting, casting, or injection molding, and the dimensional consistency is easy to control, which is beneficial for forming a stable support structure during assembly.

[0059] The two planes of the array connector 231 form surface contact with the support plate 213 and the enclosure 22 respectively. Compared with line contact or point contact, the surface contact structure increases the force-bearing area, reduces local pressure, and reduces the possibility of the connector rolling or tilting under pressure, making the support state more stable.

[0060] In addition, the rectangular array connector 231 is easy to stack, store and transport, occupies less space, which helps to reduce the cost of storage and transportation and improve the efficiency of on-site deployment of the device.

[0061] Furthermore, the bottom tray 12 includes a central tray 121 and a plurality of fan-shaped trays 122 disposed around the central tray 121. When the inner support bracket 21 is connected to the lower support bracket 11, the fan-shaped trays 122 are pressed onto the inner support bracket 21 by the central tray 121.

[0062] This application solves the installation problem of large-diameter pallets under the limited wellhead conditions of inspection wells by adopting a split-type bottom pallet structure. Due to the limited size of the inspection well opening, it is not easy to insert a one-piece large-diameter pallet. The bottom pallet 12 consists of a central pallet 121 and multiple fan-shaped pallets 122 arranged around it. The fan-shaped pallets 122 can be sent into the well through the wellhead in sequence and assembled at the bottom of the well.

[0063] When the inner support bracket 21 is installed and locked with the lower support frame 11, the downward pressure generated by the inner support bracket is transmitted to the sector trays 122 through the central tray 121, so that each sector tray forms a pressed state at the bottom and is supported together on the lower support frame 11, thereby forming an overall foundation with high load-bearing capacity.

[0064] This structure enhances the connection between the split tray components through clamping force, keeping the bottom tray 12 connected during the casting stage, reducing the risk of gaps at the joints, decreasing the possibility of slurry leakage from the bottom, and improving the casting quality.

[0065] Furthermore, the bottom of the main frame is threaded for threaded connection with the lower support frame. The support assembly is sleeved on the main frame, allowing the main frame to rotate relative to the support assembly. In this way, the inner support frame and the lower support frame can be disassembled or connected.

[0066] Furthermore, when multiple sector-shaped trays are arranged in a circle, a pressing cavity is formed therein for the central tray to be inserted.

[0067] Furthermore, the bottom of the fan-shaped tray has a downward pressing part 123 extending towards the center, and the center tray has an upward pressing part 124 extending towards the outer periphery. When the center tray presses the fan-shaped tray, the upward pressing part is stacked on top of the downward pressing part.

[0068] This method offers a degree of adaptability in its structural configuration. The modular bottom tray arrangement allows for installation even when wellhead size is limited; furthermore, the number or specifications of the movable modules 23 can be adjusted according to the wellbore diameter, making the process suitable for inspection well repair tasks of various sizes and under different site conditions.

[0069] like Figure 3As shown, this embodiment also provides a method for repairing inspection wells, including the following steps: S1: Confirm dimensions by measuring the internal shape and structural dimensions of the inspection well to be repaired; S2: Repair preparation, selecting a repair template that matches the contour of the inner wall of the inspection well and stainless steel corner pieces for connecting and fixing the repair template; S3: Base surface treatment. High-pressure water guns are used to clean the inner wall of the inspection well, removing surface deposits and loose layers, and pre-treating any leaks in the well wall to prevent leakage. S4: Install the bottom support mechanism, place the lower support frame at the bottom of the inspection well, and install the bottom tray on the lower support frame; S5: Install the side support mechanism, install the inner support bracket on the bottom tray, then surround the movable module around the inner support bracket, and then put the enclosure on the outer perimeter of the movable module to ensure that the thickness of the pouring cavity is uniform and meets the design requirements. S6: Casting and molding, pouring grout into the casting cavity to fill the casting cavity and solidify to form a load-bearing structural layer; S7: Remove the temporary structure and, after the grout has cured to the predetermined strength, remove the bottom support mechanism and the side support mechanism; S8: The repair work is completed. The repaired inspection well is inspected and accepted to complete the repair work.

[0070] The manhole repair method described in this application facilitates the formation of a relatively uniform inner lining structure. From initial dimensional measurement to base surface treatment, and then to pouring using an adjustable structure, each step focuses on controlling the thickness of the pouring cavity, resulting in a concrete lining with good uniformity and density. This application improves the construction efficiency and safety of downhole operations. The side support mechanism 2 and the bottom support mechanism 1 adopt a modular structure, which can be installed step by step downhole. The positioning method between components is clear, reducing the workload of repeated adjustments on site. The cooperation between the inner support bracket 21 and the movable module 23 provides stable support for the enclosure during the pouring stage, which helps to reduce the risk of structural displacement during construction.

[0071] Preferably, step S4 includes the following steps: S401: Arrange multiple sector-shaped trays in a circular pattern on the lower support frame; S402: Place the center tray on the sector tray and press the sector tray.

[0072] This application improves the installation feasibility of large-sized components in confined wellhead space through a split-type bottom tray structure. The bottom tray 12 consists of multiple sector trays 122 and a central tray 121. During installation, the sector trays 122 can be arranged sequentially on the lower support frame 11, and then the central tray 121 can be placed on top of it and pressed down, so that each sector tray forms a stable assembly state at the bottom of the well.

[0073] Through the two-step installation method described above, the split-type bottom tray 12 forms a complete load-bearing platform at the bottom of the well, which supports the side support mechanism 2 and the internal support bracket 21 that are subsequently installed. This structure provides the necessary load-bearing and sealing function for the foundation during the pouring stage, reduces the possibility of gaps at the interface, and helps to form stable bottom support conditions.

[0074] A stable bottom foundation provides structural conditions for the positioning and support of the side bracing mechanism 2, which helps to maintain the shape of the enclosure structure during the pouring process, making it easier for the subsequent inner lining layer to meet the design requirements in terms of thickness and molding effect.

[0075] The implementation principle of the inspection well repair device in this application is as follows: First, the bottom support mechanism 1 is placed at the bottom of the inspection well. The lower support frame 11 provides a stable foundation for the entire device. Then, the split-type bottom tray 12 is installed; multiple fan-shaped trays 122 are first arranged around the support frame, and then pressed and fixed with the central tray 121 to form a complete load-bearing platform. This step solves the problem of installing a large-sized foundation platform within a narrow well opening, laying a solid foundation for the precise positioning of subsequent structures.

[0076] Next, the installation of the core side support mechanism 2 is carried out. The inner support bracket 21 is installed on the bottom tray, which serves as the core skeleton and provides the main structural strength. Then, according to the actual diameter of the inspection well to be repaired, multiple array connectors 231 are inserted around the filling cavity 3 formed between the inner support bracket 21 and the enclosure 22. The insertion limiting grooves 13 at the bottom of these connectors ensure that their positions are accurate and do not move. By increasing, decreasing or changing the number and specifications of the connectors, the diameter of the cylindrical surface formed by the outer enclosure 22 is precisely controlled so that it can fit tightly to the irregular original well wall.

[0077] Once the diameter of the enclosure is precisely adjusted and fixed, a uniformly thick, design-compliant annular pouring cavity 4 is formed between the enclosure 22, the bottom tray 12, and the original manhole inner wall. At this point, grout is poured into the cavity. During this stage, the support plates 213 of the inner support bracket 21 and the star-shaped support group 212 play a crucial role. Through the array of connectors 231, they uniformly and effectively absorb and transfer the enormous lateral pressure exerted by the grout on the enclosure to the core main frame 211 and the bottom support mechanism 1, ensuring the absolute stability of the entire formwork system during the pouring process and preventing deformation and displacement.

[0078] After the grout in the pouring cavity has fully solidified and reached the predetermined strength, a new concrete lining layer with uniform thickness and tight bonding to the old well wall is formed. At this point, the device is dismantled in reverse order: first, the movable module 23 is removed to detach the enclosure from the lining layer, and then the inner support bracket 21 and the bottom support mechanism 1 are removed. All components can be recycled and used for the next repair operation.

[0079] Reference Figures 3 to 5 The second embodiment of this application will be described in further detail below.

[0080] Inspection well repair equipment, including Bottom support mechanism 1; The side support mechanism 2 includes an inner support bracket 21 disposed on the bottom support mechanism 1, a enclosure 22 sleeved around the outer periphery of the inner support bracket 21, movable modules 23, and V-shaped columns 24; the V-shaped columns 24 are used to connect two movable modules 23 so that the multiple movable modules 23 are arranged in a polygon. The inspection well repair device also includes a bottom support mechanism 1, which includes a lower support frame 11 and a bottom tray 12 mounted thereon. The inner support bracket 21 of the side support mechanism 2 is fixedly installed on the bottom tray 12. A filling cavity 3 is formed between the inner support bracket 21 and the enclosure 22 for the insertion of the movable module 23; The active module 23 is used to support the enclosure 22 to form a pouring cavity 4 for cement injection between the enclosure 22, the bottom support mechanism 1 and the inner wall of the inspection well.

[0081] In existing technologies, most in-well repair devices and methods are designed primarily for circular inspection wells, with the core principle being the formation of a regular cylindrical casting cavity through the adjustment of radial supports. However, municipal pipeline networks contain numerous square, rectangular, and other polygonal inspection wells, which may suffer from external damage or foundation settlement, resulting in out-of-roundness of the well walls, sharp edges, or localized depressions. Traditional circular repair devices exhibit significant shortcomings in such scenarios. Therefore, this application provides Embodiment Two for the repair of polygonal inspection wells. Different polygons are formed using movable modules of varying sizes. For example, for a 1000mm diameter inspection well, using a 300mm long movable module results in a nine-sided polygon, with a 140° angle between adjacent modules and a 40° angle on the inner side of the V-shaped column, constructed from a 50mm thick stainless steel plate. When using a 150mm long movable module, hexagonal, hexagonal, and octagonal polygons are reasonable, with a hexagonal polygon being preferred.

[0082] Furthermore, the inner side of the V-shaped column 24 is provided with a pre-installed screw 25 for threaded connection with the side of the movable module 23. The pre-installed screw is used to thread the movable module to the side, so as to fix the two movable modules together and maintain the corresponding angle. During the pouring, when the movable modules are subjected to the pressure of the pouring material, the movable modules squeeze each other and provide mutual support.

[0083] Furthermore, the pre-installed screws 25 on both sides of the inner side of the V-shaped post 24 are staggered along the length of the V-shaped post. This avoids interference between the pre-installed screws during installation.

[0084] refer to Figure 6 This embodiment also provides a manhole repair method according to Embodiment Two. The method uses the manhole repair device described above and includes the following steps: S1: Construction preparation. First, seal off other passages inside the manhole, dredge the bottom of the manhole, and clean the inner wall of the manhole to remove surface deposits and loose layers.

[0085] S2: Inspection of manholes, selecting a movable template that matches the inner wall contour of the manhole and a V-shaped column for connecting and fixing the movable template; S3: First stage of repair, a side support mechanism is built inside the inspection well, followed by the first and second grouting; the repair height range is 0-2.0m; S4: Second stage of repair, continue to build side support mechanisms on the existing side support mechanism, and then carry out the third and fourth grouting; the repair height range is increased by 2m on the original repair height; S5: Repeat the operation method of step S4, and carry out the subsequent stages of repair in sequence until the repair height range covers the depth of the inspection well; S6: Treat the grouting port; S7: Remove the side bracing mechanism; S8: The repair work is completed. The repaired inspection well is inspected and accepted to complete the repair work.

[0086] Taking a drainage inspection well with a burial depth of 7m as an example, the repair was carried out by layered pouring in four stages, which repaired the heights of 0-2m, 2-4m, 4-6m and 6-7m respectively. This ensured the structural stability, grouting density and operation safety of each layer of construction, and finally achieved the overall quality standard of the inspection well lining repair.

[0087] Furthermore, in steps S1-S7, temporary drainage is carried out on the inspection wells according to the actual situation. This removes accumulated water from the inspection wells to avoid affecting construction.

[0088] By employing a layered pouring method, the pressure exerted by the concrete on the side bracing mechanism during a single pour is significantly reduced. This avoids the risk of formwork deformation, displacement, or even collapse due to excessive pressure during a single pour, ensuring the structural stability of each stage. Each stage is constructed under controlled load conditions, making it easier to guarantee grout density and significantly improving operational safety.

[0089] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manhole repair device, characterized in that, include; Bottom support mechanism (1), which is used to be inserted into the inspection well; The side support mechanism (2) includes an inner support bracket (21) disposed on the bottom support mechanism (1), a enclosure (22) sleeved on the outer periphery of the inner support bracket (21), and a movable module (23); A filling cavity (3) is formed between the inner support bracket (21) and the enclosure (22) for the insertion of the movable module (23); The active module (23) is used to support the enclosure (22) to form a pouring cavity (4) for cement injection between the enclosure (22), the bottom support mechanism (1) and the inner wall of the inspection well.

2. The inspection well repair device according to claim 1, characterized in that, The active module (23) includes a plurality of array connectors (231) for insertion into the filling cavity (3). The plurality of array connectors (231) surround the inner support bracket (21) and are distributed in a cylindrical shape. The enclosure (22) surrounds the outer periphery of the plurality of array connectors (231) to adjust the diameter of the enclosure (22).

3. The inspection well repair device according to claim 2, characterized in that, The bottom support mechanism (1) includes a lower support frame (11) and a bottom tray (12) disposed on the lower support frame (11).

4. The inspection well repair device according to claim 3, characterized in that, The bottom tray (12) is provided with a plug-in limiting groove (13) for the array plug-in (231) to be inserted.

5. The inspection well repair device according to claim 4, characterized in that, The internal support bracket (21) includes a main frame (211), a bracket group (212) spaced apart along the length of the main frame (211), and a support plate (213) surrounding the bracket group (212).

6. The inspection well repair device according to claim 5, characterized in that, The support assembly (212) includes side frames (214) arranged in a cross shape, and corner frames (215) arranged in a star shape with the side frames (214). The ends of the side frames (214) are connected to the middle of the support plate (213), and the ends of the corner frames (215) are connected to the connection between the two support plates (213).

7. The inspection well repair device according to claim 2, characterized in that, The array connector (231) is rectangular.

8. A manhole repair device, characterized in that, include Bottom support mechanism (1); The side support mechanism (2) includes an inner support bracket (21) disposed on the bottom support mechanism (1), a enclosure (22) sleeved on the outer periphery of the inner support bracket (21), a movable module (23), and a V-shaped column (24); the V-shaped column (24) is used to connect two movable modules (23) so that the multiple movable modules (23) are arranged into a polygon. A filling cavity (3) is formed between the inner support bracket (21) and the enclosure (22) for the insertion of the movable module (23); The active module (23) is used to support the enclosure (22) to form a pouring cavity (4) for cement injection between the enclosure (22), the bottom support mechanism (1) and the inner wall of the inspection well.

9. The inspection well repair device according to claim 8, characterized in that, The inner side of the V-shaped column (24) is provided with a pre-installed screw (25) for threaded connection with the side of the movable module (23).

10. A method for repairing inspection wells, characterized in that, The method uses the inspection well repair device as described in any one of claims 8-9, and the method includes the following steps. S1: Construction preparation: First, block other passages inside the manhole, clean the bottom of the manhole, and clean the inner wall of the manhole to remove surface deposits and loose layers. S2: Inspection of manholes, selecting a movable template that matches the inner wall contour of the manhole and a V-shaped column for connecting and fixing the movable template; S3: First stage of repair, a side support mechanism is built inside the inspection well, followed by the first and second grouting; the repair height range is 0-2.0m; S4: Second stage of repair, continue to build side support mechanisms on the existing side support mechanism, and then carry out the third and fourth grouting; the repair height range is increased by 2m on the original repair height; S5: Repeat the operation method of step S4, and carry out the subsequent stages of repair in sequence until the repair height range covers the depth of the inspection well; S6: Treat the grouting port; S7: Remove the side bracing mechanism; S8: The repair work is completed. The repaired inspection well is inspected and accepted to complete the repair work.

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