A prefabricated repair structure for a square-chambered inspection well in a pipeline network

Abstract

This utility model provides a prefabricated repair structure for a square manhole inspection well in a pipeline network. It includes a horizontally arranged prefabricated manhole, a vertical shaft eccentrically positioned on the side wall of the prefabricated manhole via a connecting structure, and a first connecting sleeve. The prefabricated manhole includes a first manhole assembly and a second manhole assembly, each assembly being detachably and sealingly assembled into a cylindrical structure. Water pipe connection portions extend from both ends of each manhole assembly, and each water pipe connection portion has a first groove on its inner wall, with corresponding grooves forming a first sealing groove. One end of the first connecting sleeve is sealed and inserted into the water pipe connection portion, while the other end is used for a sealed connection with a drainage pipe. The connecting structure includes a manhole assembly and a manhole connection portion that are detachably and sealingly assembled into a connecting cylinder. One end of the vertical shaft is sealed and inserted into the open end of the connecting cylinder. This utility model enables convenient and rapid repair of brick manholes corresponding to large-diameter drainage pipes without excavation.

Description

Technical Field

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

[0002] Traditional old-style inspection wells are mostly made of brick, which has poor quality stability, low brick strength, and is prone to structural damage, sewage leakage, and injuries from the manhole cover. When damage is required for repair, the excavation and repair work of brick inspection wells is large, time-consuming, and costly, resulting in slow replacement. In trenchless repair, especially for inspection wells with a square chamber offset from the shaft, the shaft and chamber are eccentrically set, and the size of the chamber is much larger than the size of the shaft opening (the standard opening size is usually 700mm in diameter, and the diameter of the drainage pipe connected to the chamber is greater than 1000mm, making the dimensions of the square chamber larger than the opening size in all directions). Conventional prefabricated chambers cannot be lowered into the brick inspection well through the narrow opening. At the same time, the axis of the inlet is spatially offset relative to the axis of the square chamber, which brings assembly difficulties to the connection between the shaft and the chamber.

[0003] Therefore, there is an urgent need for a prefabricated repair structure for square manhole inspection wells in pipeline networks, which can enable convenient and rapid repair of brick-built wells corresponding to large-diameter drainage pipes without excavation. Summary of the Invention

[0004] The purpose of this invention is to provide an assembled repair structure for a square manhole inspection well in a pipeline network, aiming to solve the technical problems of long repair cycles and high maintenance costs associated with traditional brick-built manhole inspection wells for large-diameter drainage pipes.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a prefabricated repair structure for a square manhole inspection well in a pipeline network, comprising a horizontally arranged prefabricated manhole, a vertical well cylinder eccentrically set on the side wall of the prefabricated manhole via a connecting structure, and a first connecting pipe sleeve.

[0006] The prefabricated well chamber includes multiple sets of first well chamber modules and at least one set of second well chamber modules. Each well chamber module is assembled in a detachable and sealed manner to form a cylindrical structure with open ends. The second well chamber module includes a second well chamber module body.

[0007] Each well chamber assembly has a water pipe connection extending from both ends. The inner wall of each water pipe connection is provided with a first groove. When the two ends of the cylindrical structure are spliced ​​together, the first grooves at the corresponding positions are sealed to form a first sealing groove.

[0008] One end of the first connecting sleeve is sealed and inserted into the water pipe connection part, and the other end is used for a sealed connection with the corresponding drain pipe.

[0009] The connecting structure includes a well casing block adapted to the vertical well casing, and a well casing connecting part disposed on the outer wall of the second well casing block body; the well casing block and the well casing connecting part are detachably and sealed together to form a connecting cylinder with one end open, and one end of the vertical well casing is sealed and inserted into the open end of the connecting cylinder.

[0010] As a further improvement to the above scheme, each well chamber assembly, well cylinder assembly, and vertical well cylinder in the prefabricated well chamber is made of ductile iron.

[0011] As a further improvement to the above solution, the first well chamber assembly includes a first well chamber assembly body and connecting plates respectively disposed on both sides of the first well chamber assembly body, and the connecting plates are also respectively disposed on both sides of the second well chamber assembly body;

[0012] Each of the connecting plates extends toward the center of the cylindrical structure;

[0013] Each connecting plate has several connecting holes spaced apart along its length;

[0014] The adjacent first well chamber assembly, the adjacent second well chamber assembly, and the first well chamber assembly and the second well chamber assembly are detachably bolted together in pairs through corresponding connecting holes to form a whole.

[0015] As a further improvement to the above solution, expansion seals are provided at the joints of each well chamber assembly to enable detachable and sealed splicing of multiple well chamber assemblies.

[0016] As a further improvement to the above scheme, each well chamber assembly is provided with a second groove on both sides, the second groove extending along its length; the expansion seal is disposed in the second groove.

[0017] As a further improvement to the above solution, the well casing assembly includes a well casing assembly body, with a first cylindrical edge extending from the corresponding outer periphery of the well casing assembly body; a second cylindrical edge extending from the corresponding outer periphery of the well casing connecting part and adapted to the first cylindrical edge; and the first cylindrical edge and the second cylindrical edge are detachably and sealedly connected by fasteners.

[0018] As a further improvement to the above solution, the prefabricated repair structure includes two or more vertical shafts, and each vertical shaft is detachably stacked in sequence; adjacent vertical shafts are connected by a three-way or four-way opening clamp.

[0019] The remaining openings of the three-way or four-way opening clamps are provided with a second connecting sleeve for connection to the drainage branch pipe.

[0020] As a further improvement to the above solution, both the first connecting sleeve and the second connecting sleeve are made of stainless steel.

[0021] As a further improvement to the above solution, one end of each connecting sleeve is provided at the corresponding opening via a sealing ring;

[0022] 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;

[0023] Specifically, the sealing structure includes a second sealing groove disposed on the outer wall of the other end of the connecting sleeve, and a second sealing ring disposed within the second sealing groove; preferably, the second sealing ring is a toothed sealing ring.

[0024] Secondly, this utility model also provides a repair construction method for a prefabricated repair structure of a square manhole inspection well in a pipeline network as described in the first aspect, the steps of which include:

[0025] S1. Hoist each well chamber assembly block to the bottom of the well, assemble each well chamber assembly block into a cylindrical structure with open ends, and arrange the cylindrical structure horizontally at the bottom of the well, with the two ends of the opening facing the corresponding drainage pipes respectively. The well cylinder connection part of the outer wall of the second well chamber assembly block body is adapted to the well cylinder connection part of the original brick-built inspection well; then set a sealing ring in the first sealing groove at both ends, and then insert one end of the first connecting pipe sleeve into the open end of the cylindrical structure, and seal the other end into the corresponding drainage pipe.

[0026] S2. Hoist the well barrel assembly block to the bottom of the well and seal it with the well barrel connection part to form a connecting cylinder with one open end;

[0027] S3. Hoist the vertical shaft to the bottom of the shaft, and seal one end of the vertical shaft to the open end of the connecting cylinder;

[0028] S4. 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 work.

[0029] As a further improvement to the above solution, in step S1, if the diameter of the drainage pipe is larger than the original brick-built inspection well opening size, the first connecting pipe 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 connecting pipe sleeve is inserted into the opening end of the cylindrical structure, and the other end is sealed and inserted into the corresponding drainage pipe.

[0030] 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 S3, the vertical well is divided into at least two sections, and a three-way opening clamp or a four-way opening clamp is installed at the corresponding drainage branch pipe.

[0031] Adjacent vertical shafts stacked one on top of the other are connected into one unit by a three-way or four-way opening clamp, and the second connecting pipe sleeve on the three-way or four-way opening clamp is connected to the corresponding drainage branch pipe.

[0032] As a further improvement to the above solution, the following steps are included before step S1:

[0033] 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.

[0034] S02. Based on the measured dimensions:

[0035] The well chamber is divided into multiple pairs of first well chamber modules and at least one pair of second well chamber modules;

[0036] The connection between the well chamber and the well shaft is divided into well shaft modules and well shaft connection parts;

[0037] The vertical shaft is configured into the corresponding number of sections according to the location of the drainage branch pipe;

[0038] The individual well chambers, well shafts, and vertical well shafts are formed by casting ductile iron.

[0039] Because this utility model adopts the above technical solutions, the beneficial effects of this utility model are as follows:

[0040] 1. This utility model provides a prefabricated repair structure for square manhole inspection wells in pipeline networks. Traditional brick manhole repair requires overall excavation, which has problems such as long construction period, large amount of earthwork, and serious damage to surrounding roads / pipelines. This utility model adopts a modular prefabricated structure, which disassembles the prefabricated manhole into multiple sets of detachable and sealed first manhole blocks and second manhole blocks. Each manhole block is an independent and detachable structure, and its size design is adapted to conventional manhole hoisting. It can be directly hoisted to the bottom of the manhole through the original manhole opening. On-site, only assembly is needed to form a cylindrical manhole body with open ends, without the need for large-area excavation. Especially for large-diameter transverse manholes, it avoids the disturbance of deep soil and underground pipelines caused by traditional excavation, significantly shortens the construction period, reduces the impact on traffic, municipal facilities and residents' lives, and conforms to the concept of green construction.

[0041] Especially in scenarios where the horizontal manhole and the vertical manhole are eccentrically arranged, this utility model achieves flexible positioning of the vertical manhole through a detachable and sealed splicing connection structure: the manhole connection part of the manhole block and the second manhole block can be detachably and sealedly spliced ​​to form a connecting cylinder, and the vertical manhole only needs to be sealed and inserted into the opening end of the connecting cylinder to complete the fixation; it breaks through the limitation of the traditional coaxial arrangement of manhole and manhole, and can adjust the eccentric position of the vertical manhole according to the actual pipeline route, effectively avoiding spatial conflicts with existing underground facilities such as drainage pipes and cables, and improving the universality of the repair solution;

[0042] In addition, the well chamber modules, well shaft modules, and connecting sleeves are all independent prefabricated components, which can be assembled on site with only bolt connections and can be quickly separated during disassembly. This design facilitates transportation and storage, and allows for the replacement of damaged modules (such as the first well chamber module with localized leakage) during subsequent maintenance or secondary repairs, without the need for complete scrapping. This significantly reduces material consumption and maintenance costs, and extends the entire life cycle of the well chamber.

[0043] This utility model can flexibly adapt to the repair needs of horizontal well chambers of different diameters (especially large diameters) by adjusting the number and size of the well chamber assembly blocks; at the same time, the offset connection structure of the vertical well cylinder can be compatible with various specifications of drainage pipe interfaces without additional modification to existing pipes, further expanding the application scope of this utility model in municipal drainage, industrial pipe networks and other fields.

[0044] In summary, this utility model, through its modular design and eccentric connection structure, achieves high efficiency, reliability, and economy in trenchless repair of large-diameter transverse well chambers, effectively solving many drawbacks of traditional excavation repair and possessing significant value for widespread application.

[0045] 2. This utility model provides a prefabricated repair structure for a square manhole inspection well in a pipeline network. The manhole blocks and the manhole cylinder of the prefabricated manhole are all made of ductile iron. Ductile iron has high strength, high toughness, excellent corrosion resistance and impact resistance, making the entire repair structure sturdy and reliable with strong load-bearing capacity. The ductile iron cylinder itself or its interior can be easily equipped with or installed with a detachable ladder, improving the safety and convenience of maintenance operations.

[0046] 3. The present invention provides a prefabricated repair structure for a square manhole inspection well in a pipeline network. In cases where there are drainage branch pipes in the manhole section, the manhole is divided into two or more sections. At the corresponding drainage pipe, a three-way or four-way opening clamp is installed to achieve convenient connection between the manhole and the drainage branch pipe, thereby realizing flexible and quick repair of the brick inspection well.

[0047] 4. This utility model provides a repair construction method for a prefabricated repair structure of a square manhole inspection well in a pipeline network. Through modular assembly, adaptable pipe sleeve design, and optimization of trenchless construction technology, it significantly improves the convenience and speed of the repair process, especially in trenchless scenarios, greatly improving construction efficiency. Specifically, this utility model uses the manhole block body as the basic assembly unit, realizing a "measurement-hoisting-assembly" assembly line operation mode. With the sealing structure at each connection, each block achieves "immediate sealing upon assembly" through standardized interfaces, which greatly improves construction efficiency compared to the traditional brick or cast-in-place manhole construction process.

[0048] To address the problem of poor compatibility between different drainage pipe diameters in existing technologies, this utility model innovatively adopts an adaptable connecting pipe sleeve structure: when the diameter of the drainage pipe at the bottom of the well is larger than the original well opening, the corresponding connecting pipe sleeve is cut open and rolled up to be smaller than the well opening diameter. After hoisting at the bottom of the well, it is then unfolded to the preset diameter using a spreading tool and welded into shape. This allows for the smooth hoisting of large-diameter connecting pipe sleeves to the required position without excavation. The pipe diameter adjustment can be completed with simple on-site operations, solving the problem of large-area excavation required in traditional repairs due to pipe diameter mismatch. It is particularly suitable for the repair of complex pipe networks with multiple pipe diameters in trenchless scenarios, further shortening the construction preparation time.

[0049] This utility model adopts a trenchless or minimally excavated mode throughout the entire process. Through the hoisting, splicing, and sealing process of the prefabricated manhole, it avoids the drawbacks of traditional repairs that require large-scale road excavation and demolition of the original manhole structure. While ensuring repair quality, it significantly improves the convenience and speed of construction. In particular, in trenchless scenarios, it achieves efficient operation of the entire process of "rapid measurement-rapid assembly-rapid acceptance", providing an efficient and environmentally friendly new repair solution for urban pipeline network operation and maintenance. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a three-dimensional schematic diagram of a prefabricated repair structure for a square manhole inspection well in a pipeline network, as disclosed in this utility model.

[0052] Figure 2 This is a front view schematic diagram of a prefabricated repair structure for a square manhole inspection well in a pipeline network disclosed in this utility model;

[0053] Figure 3 This is a side view schematic diagram of a prefabricated repair structure for a square manhole inspection well in a pipeline network disclosed in this utility model;

[0054] Figure 4 yes Figure 3 A schematic diagram of the AA-direction section;

[0055] Figure 5 This is a cross-sectional schematic diagram of the first well chamber assembly disclosed in this utility model;

[0056] Figure 6 This is a partially enlarged schematic diagram of the sealing connection between the connecting sleeve and the corresponding drain pipe / drainage branch pipe disclosed in this utility model;

[0057] Figure 7 This is a three-dimensional schematic diagram of the first connecting sleeve disclosed in this utility model after it has been stretched open and welded together.

[0058] Figure label:

[0059] 1. Prefabricated well chamber; 11. First well chamber assembly; 111. First well chamber assembly body; 12. Second well chamber assembly; 121. Second well chamber assembly body; 122. Well shaft connection; 123. Second shaft edge; 13. Water pipe connection; 14. First groove; 15. Expansion seal; 16. Connecting plate; 17. Connecting hole;

[0060] 2. Connecting structure; 21. Well shaft assembly; 211. Well shaft assembly body; 212. First shaft edge; 3. Vertical well shaft; 4. First connecting pipe sleeve; 5. Tee open clamp or cross open clamp; 6. Second connecting pipe sleeve; 7. Second sealing groove; 8. Second sealing ring; 9. Drainage pipe / drainage branch pipe; 10. Weld.

[0061] 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

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Example 1

[0066] See Figures 1-7 This utility model provides a prefabricated repair structure for a square manhole inspection well in a pipeline network, including a horizontally arranged prefabricated manhole 1, a vertical well cylinder 3 eccentrically set on the side wall of the prefabricated manhole 1 through a connecting structure 2, and a first connecting pipe sleeve 4; each component is quickly assembled through detachable and sealed splicing, which is suitable for the rapid modification or construction of horizontal manholes in underground pipeline network repair scenarios.

[0067] See Figure 1 and Figure 4 The prefabricated well chamber 1 includes a cylindrical structure with open ends formed by multiple sets of first well chamber blocks 11 and at least one set of second well chamber blocks 12 being detachably and sealed together.

[0068] Specifically, the first well chamber assembly 11 includes a first well chamber assembly body 111, and connecting plates 16 are fixedly connected to both sides of the body; the connecting plates 16 extend toward the center of the cylindrical structure, and a number of connecting holes 17 are spaced apart along their length direction (along the well chamber axis) for detachable connection with the connecting plates 16 of adjacent well chamber assemblies by bolts.

[0069] The second well chamber assembly 12 includes a second well chamber assembly body 121, on both sides of which are also fixedly connected with connecting plates 16 (with the same structure as the connecting plate 16 of the first well chamber assembly 11) to adapt to bolting with adjacent well chamber assemblies; the outer wall of the second well chamber assembly body 121 (the side away from the center of the cylindrical structure) is also provided with a well cylinder connecting part 122 for sealing and splicing with the well cylinder assembly 21 in the connecting structure 2;

[0070] The connection between any two adjacent well chamber blocks (i.e., the first well chamber block 11 with the first well chamber block 11, the second well chamber block 12 with the second well chamber block 12, and the first well chamber block 11 with the second well chamber block 12) is achieved by precisely aligning the connecting plates 16 on their adjacent sides, and then using bolts or other fasteners to fasten them by passing them through the connecting holes 17 on the corresponding connecting plates 16. This ensures that all well chamber blocks are tightly connected, forming an integrated and stable cylindrical well chamber structure.

[0071] Each well chamber assembly (including the first well chamber assembly 11 and the second well chamber assembly 12) has a water pipe connection part 13 (i.e., a short pipe structure protruding at the ends of the cylindrical structure) extending from both ends. The inner wall of the water pipe connection part 13 is provided with a first groove 14. When multiple sets of well chamber assemblies are spliced ​​together to form a complete cylindrical structure, the first groove 14 at the corresponding position is sealed and connected to form a first sealing groove that runs through both ends of the cylindrical structure (used to accommodate the sealing element of the first connecting pipe sleeve 4).

[0072] The connecting structure 2 is used to eccentrically position the vertical shaft 3 on the side wall of the prefabricated well chamber 1, and includes:

[0073] Well casing block 21: An annular block adapted to the vertical well casing 3, one end of which is sealed and inserted into the vertical well casing 3, and the other end is detachably sealed and spliced ​​to the well casing connection part 122 of the second well chamber block 12.

[0074] Well shaft connecting part 122: An irregularly shaped cylinder set on the outer wall of the second well chamber assembly body 121, which locks the well shaft assembly 21 to the well shaft connecting part 122 with bolts, and at the same time, a sealing material is set at the joint to form a connecting cylinder with one open end (the open end is used to insert the vertical well shaft 3); one end of the vertical well shaft 3 is sealed and inserted into the open end of the connecting cylinder;

[0075] The first connecting sleeve 4 is a tubular structure with open ends. One end is sealed and inserted into the water pipe connection part 13 at both ends of the prefabricated well chamber 1 (the insertion depth matches the first sealing groove), and the other end is sealed and connected to the corresponding drainage pipe (such as municipal sewage pipe or rainwater pipe).

[0076] The prefabricated well chamber 1, the well chamber assembly blocks 21, and the vertical well barrel 3 are all made of ductile iron. The high strength, wear resistance, and excellent corrosion resistance of ductile iron can effectively improve the service life of the structure and adapt to complex underground environments such as dampness and acidity / alkali.

[0077] The joints of each well chamber assembly (i.e., the joints of the connecting plates 16 of adjacent assemblies and the joints of the well shaft assembly 21 and the well shaft connection 122) are provided with expansion seals 15 (such as water-swellable rubber strips or elastic sealing strips); furthermore, a second groove is provided on both sides of each well chamber assembly along its length direction, and the expansion seals 15 are embedded in the second grooves and fit tightly against the grooves of adjacent assemblies to ensure the sealing reliability of the joints and prevent groundwater or sewage leakage;

[0078] This invention, through its innovative modular prefabricated structure and sealed connection method, enables convenient and rapid repair of damaged brick wells in large-diameter transverse well chambers without excavation. Specifically, the prefabricated well chamber 1 is disassembled into multiple sets of detachable and sealed first well chamber blocks 11 and second well chamber blocks 12. Each well chamber block is an independent and detachable structure, and its size design is adapted to conventional wellhead hoisting. It can be directly hoisted to the bottom of the well through the original wellhead. On-site, only assembly is required to form the cylindrical well chamber body with open ends, without the need for large-area excavation. Especially for large-diameter transverse well chambers, it avoids the disturbance to deep soil and underground pipelines caused by traditional excavation, significantly shortens the construction period, reduces the impact on traffic, municipal facilities, and residents' lives, and conforms to the concept of green construction. Each component (well chamber block, well cylinder block 21, connecting pipe sleeve) is an independent module, fixed by bolt connection and sealing, which is convenient for disassembly, replacement, or upgrade. During maintenance, only the damaged parts need to be removed, without the need for complete demolition, which significantly reduces the later operation and maintenance costs.

[0079] An expansion seal 15 (embedded in the second groove) is installed at the joint of the well chamber blocks. After expanding when exposed to water, it fits tightly into the groove. Combined with the bolt fastening structure of the connecting plate 16, it effectively prevents sewage leakage. The plug-in design of the first connecting pipe sleeve 4 and the first sealing groove further strengthens the sealing connection between the drainage pipe and the well chamber, preventing groundwater backflow. In addition, the main components are made of ductile iron, and their tensile strength, yield strength and elongation meet the long-term pressure requirements of the underground pipe network. The surface anti-corrosion treatment can resist soil acid and alkali corrosion and extend the service life of the structure.

[0080] Especially in scenarios where the horizontal manhole and the vertical shaft 3 are eccentrically arranged, this utility model achieves flexible positioning of the vertical shaft 3 through a detachable and sealed splicing connection structure 2: the shaft connection part 122 of the shaft block 21 and the second manhole block 12 can be detachably and sealedly spliced ​​to form a connecting cylinder, and the vertical shaft 3 only needs to be sealed and inserted into the opening end of the connecting cylinder to complete the fixation; it breaks through the limitation of the traditional coaxial arrangement of the manhole and shaft, and can adjust the eccentric position of the vertical shaft 3 according to the actual pipeline route, effectively avoiding spatial conflicts with existing underground facilities such as drainage pipes and cables, and improving the universality of the repair solution;

[0081] In addition, by adjusting the number and size of the well chamber blocks, this utility model can flexibly adapt to the repair needs of horizontal well chambers with different diameters (especially large diameters); at the same time, the offset connection structure 2 of the vertical well cylinder 3 can be compatible with various specifications of drainage pipe interfaces, without the need for additional modification of existing pipes, further expanding the application scope of this utility model in municipal drainage, industrial pipe networks and other fields.

[0082] In summary, this utility model, through its modular design and eccentric connection structure 2, achieves high efficiency, reliability, and economy in trenchless repair of large-diameter transverse well chambers, effectively solving many drawbacks of traditional excavation repair and possessing significant value for widespread application.

[0083] In a preferred embodiment, the well block 21 includes a well block body 211, the outer contour of which is adapted to the inner cavity of the well to be repaired;

[0084] To enhance the sealing and detachability of the connection between the well casing block 21 and the well casing connection part 122, a first cylindrical edge 212 extends from the corresponding outer periphery of the well casing block body 211; the first cylindrical edge 212 is a flange structure.

[0085] Correspondingly, a second cylindrical edge 123 extends from the corresponding outer periphery of the well casing connecting portion 122 (referring to the mating end faces of adjacent well casing blocks 21); the structure of the second cylindrical edge 123 is completely matched with the first cylindrical edge 212; an expansion seal 15 is provided between the contact surfaces of the first cylindrical edge 212 and the second cylindrical edge 123 to enhance the sealing performance and prevent leakage.

[0086] The first cylindrical edge 212 and the second cylindrical edge 123 are detachably sealed together by fasteners. The fasteners are preferably stainless steel bolt assemblies. After the bolts pass through the through holes of the first cylindrical edge 212 and the second cylindrical edge 123, they are locked with nuts. The pre-tightening force achieves a tight fit between the two cylindrical edges, and at the same time, the expansion seal 15 is squeezed to achieve a preliminary seal. When the expansion seal 15 comes into contact with water, it expands to achieve a more reliable seal. This detachable seal can, on the one hand, allow the various blocks to be lowered to the required position from the narrow original wellhead, and on the other hand, allow for the separate disassembly of a section of well block 21 for maintenance without damaging the overall structure.

[0087] As a preferred embodiment, if the original brick-built inspection well is also provided with a drainage branch pipe along its height direction, in order to achieve an effective connection with the drainage branch pipe, the vertical well 3 is divided into at least two sections, and a three-way opening clamp or a four-way opening clamp 5 is installed at the corresponding drainage branch pipe.

[0088] Specifically, the main body of the tee clamp is a split ring structure with three openings. Two of the openings are axial and are used to connect the ends of the upper and lower vertical shaft sections 3. The other opening is radial and is used to connect the drainage branch pipe. The four-way clamp has four openings, two axial and two radial, and is suitable for scenarios that require more branch pipe connections.

[0089] The remaining openings (i.e., openings that are not axially connected to the well shaft) of the three-way or four-way opening clamp 5 are provided with a second connecting sleeve 6; the second connecting sleeve 6 is a short tubular structure, one end of which is embedded in the opening of the clamp and sealed and fixed with the clamp, and the other end is detachably connected to the drainage branch pipe; the setting of the second connecting sleeve 6 realizes the quick docking of the drainage branch pipe and the well shaft body, avoiding the cumbersome process of traditional welding or cement pouring.

[0090] As a preferred embodiment, in order to ensure the sealing reliability between the connecting sleeve and the well body and the drainage branch pipe, the first connecting sleeve 4 and the second connecting sleeve 6 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.

[0091] Each connecting pipe sleeve has a sealing ring at one end of the corresponding opening, and its other end has a sealing structure on its outer wall for detachable and sealed connection with the corresponding drain pipe / drain branch pipe 9.

[0092] See Figure 6 The sealing structure includes a second sealing groove 7 disposed on the outer wall of the other end of the connecting pipe sleeve, and a second sealing ring 8 disposed in the second sealing groove 7; preferably, the second sealing ring 8 is a toothed sealing ring, which can achieve effective sealing with the corresponding drain pipe / drain branch pipe 9 to prevent leakage;

[0093] The toothed sealing ring has multiple raised teeth on its outer periphery. When it is pressed against the inner wall of the drain pipe / drain branch pipe 9, the toothed sealing ring can increase the friction through the interlocking action of the teeth. At the same time, it fills the tiny gap between the connecting sleeve and the drain pipe / drain branch pipe 9, 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 of non-rigid connections.

[0094] Specifically, one end of the first connecting sleeve 4 is provided with a sealing ring at the corresponding opening of the cylindrical structure of the prefabricated well chamber 1; the other end is sealed to the corresponding drainage pipe through the sealing structure.

[0095] One end of the second connecting sleeve 6 is set at the corresponding clamp opening through a sealing ring, 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 connecting sleeve.

[0096] Example 2

[0097] This utility model also provides a repair construction method for a prefabricated repair structure of a square manhole in a pipe network, as described in Embodiment 1. This method is applicable to problems such as leakage and structural instability caused by aging and damage of brick manholes in municipal drainage systems, especially for repair scenarios involving horizontally arranged manholes. This utility model achieves efficient and precise repair operations through modular prefabrication, rapid assembly, and adaptive adjustment technologies. The following details the specific steps and improvement scheme:

[0098] I. Pre-construction preparations (S01-S02)

[0099] S01. Cleaning and measuring of damaged inspection wells

[0100] First, the damaged brick manholes are thoroughly cleaned, removing silt, debris, and loose bricks to ensure the repair area is free of obstructions. Then, using a laser rangefinder, measuring tape, and other tools, all dimensions of the original brick manhole are precisely measured, including: the inner diameter of the manhole shaft, the lateral length of the manhole chamber, the height of the manhole shaft, and the cross-sectional dimensions at the connection between the manhole chamber and the manhole shaft. Simultaneously, the diameters of all drainage pipes connected to the original manhole, as well as the diameters and locations of all drainage branch pipes (heights from the bottom of the manhole, h1, h2, etc.), are measured. The measurement data must be recorded and marked on the repair design drawings as the basis for subsequent prefabricated module dimension design.

[0101] S02, Segmentation and Forming of Prefabricated Modules

[0102] Based on the measurement data of S01, and combined with the structural characteristics of the transverse well chamber (such as the offset transverse channel), the well chamber is divided into multiple pairs of first well chamber blocks 11 and at least one pair of second well chamber blocks 12; at the same time, the connection between the well chamber and the well shaft (i.e., the annular interface where the original brick well chamber transitions to the well shaft) is divided into well shaft blocks 21 and well shaft connection parts 122; in addition, according to the setting position of the drainage branch pipe (such as being located in the middle or bottom of the well shaft), the vertical well shaft 3 is pre-divided into at least two sections (for example, if the branch pipe is located at 1 / 2 of the well shaft height, it is divided into upper and lower sections), and installation interfaces matching the tee / cross clamps are reserved at the division points; finally, all modules (well chamber blocks, well shaft blocks 21, and vertical well shaft 3) are cast from ductile iron to ensure strength, corrosion resistance, and dimensional accuracy.

[0103] II. Core Repair Construction Steps (S1-S4)

[0104] S1. Hoisting of well chamber modules and assembly of the transverse cylindrical structure

[0105] Lifting preparation: Lift each of the first chamber assembly 11 and the second chamber assembly 12 to the bottom of the well; during the lifting process, ensure that the assemblies are laterally aligned by using the positioning marks on the lifting equipment (the offset direction is consistent with the original design);

[0106] Horizontal splicing: The first well chamber block 11 and the second well chamber block 12 are spliced ​​horizontally (along the direction of the drainage pipe) to form a cylindrical structure with open ends (i.e., the main body of the horizontal well chamber). During splicing, positioning is quickly achieved by using positioning pins (pre-processed at the ends of the blocks) on the edge of the blocks.

[0107] Opening end adaptation: Adjust the lateral angle of the cylindrical structure so that the openings at both ends are directly aligned with the main drainage pipe connected to the original brick inspection well (i.e., the opening direction is consistent with the axis of the drainage pipe).

[0108] Sealing ring installation: Rubber sealing rings are embedded in the first sealing grooves (circularly set along the edge of the open end) at both ends of the cylindrical structure to ensure the sealing with the first connecting sleeve 4.

[0109] Installation of the first connecting sleeve 4: Insert one end of the first connecting sleeve 4 into the open end of the cylindrical structure and press it against the sealing ring in the first sealing groove; the other end of the first connecting sleeve 4 is then sealed and inserted into the corresponding main drain pipe.

[0110] Special case handling (drainage pipe diameter is larger than the original well opening size):

[0111] If the diameter of the main drainage pipe is larger than the original brick-built inspection well opening size, the first connecting pipe sleeve 4 needs to be pre-adjusted:

[0112] See Figure 7 First, the first connecting sleeve 4 is cut axially and rolled up to a diameter smaller than the original well opening size. After being hoisted to the bottom of the well, a spreading tool (such as a hydraulic flapper) is used to spread the rolled-up sleeve to a preset diameter to ensure that the sleeve fits snugly against the inner wall of the drainage pipe. After spreading, the cut of the sleeve is fixed by full welding, forming a full weld 10, thus forming a closed annular structure. Finally, the welded first connecting sleeve 4 is inserted into the open end of the cylindrical structure and sealed and fixed.

[0113] S2, Assembly of well shaft assembly block 21 and connecting cylinder

[0114] The well casing block 21 (the end that connects to the well chamber) is hoisted to the bottom of the well and sealed and spliced ​​with the well casing connection part 122 (i.e., the connection interface between the well chamber and the well casing) of the well chamber cylindrical structure to form a connecting tube with one open end (the inside of the connecting tube connects the well chamber and the well casing); during splicing, the outer periphery of the well casing block 21 and the inner periphery of the well casing connection part 122 are connected by an annular positioning step; an expansion seal 15 is set at the splice joint, which expands when exposed to water to achieve a tight seal;

[0115] S3, hoisting and branch pipe connection of vertical shaft 3

[0116] Vertical shaft 3 hoisting: Hoist the prefabricated vertical shaft 3 in sections to the bottom of the shaft, align the lower opening of the shaft with the upper opening of the connecting cylinder, and seal and insert it into the upper opening of the connecting cylinder.

[0117] Drainage branch pipe connection (if a drainage branch pipe exists): If a drainage branch pipe is provided in the height direction of the original inspection well shaft (such as located at the middle h1 of the shaft), then the vertical shaft 3 will be divided into upper and lower sections at the location of the branch pipe.

[0118] Install a T-junction clamp (or a four-way clamp, if multiple branch pipes need to be connected) at the separation point.

[0119] The adjacent vertical shafts 3 stacked on top of each other are connected into one unit by a three-way open clamp or a four-way open clamp 5 (the clamp is fixed to the flange bolt of the shaft section), and the second connecting pipe sleeve 6 on the three-way open clamp or four-way open clamp 5 is connected to the corresponding drainage branch pipe.

[0120] S4. Water flow test, water pressure test and backfilling

[0121] Water flow test: Close all manhole covers, inject clean water into the repaired manhole, observe for 30 minutes, and check for any leakage at the joints of the manhole panels, the interfaces of the connecting pipe sleeves, and the connections of the drainage branch pipes.

[0122] Water pressure test (only for pressure drainage systems): Close the drain pipe outlet, pressurize the well to the design pressure using a water pump, maintain the pressure for 30 minutes, and the pressure drop should be ≤0.02MPa with no leakage at all joints and pipe connections to be considered qualified;

[0123] Foamed concrete backfilling: After the test is passed, C30 fine stone concrete (or foamed concrete) is used to backfill the area around the manhole in layers. After backfilling to the original ground level, the surface is covered with medium and coarse sand.

[0124] By optimizing modular assembly, adaptable pipe sleeve design, and trenchless construction technology, the convenience and speed of the repair process are significantly improved, especially in trenchless scenarios where construction efficiency is greatly enhanced. Specifically, this utility model uses the well chamber block body as the basic assembly unit, realizing a "measurement-hoisting-assembly" assembly line operation mode. With the sealing structure at each connection, each block achieves "immediate sealing upon assembly" through standardized interfaces, which greatly improves construction efficiency compared to the traditional brick or cast-in-place well chamber on-site masonry process.

[0125] To address the problem of poor compatibility between different drainage pipe diameters in existing technologies, this utility model innovatively adopts an adaptable connecting pipe sleeve structure: when the diameter of the drainage pipe at the bottom of the well is larger than the original well opening, the corresponding connecting pipe sleeve is cut open and rolled up to be smaller than the well opening diameter. After hoisting at the bottom of the well, it is then unfolded to the preset diameter using a spreading tool and welded into shape. This allows for the smooth hoisting of large-diameter connecting pipe sleeves to the required position without excavation. The pipe diameter adjustment can be completed with simple on-site operations, solving the problem of large-area excavation required in traditional repairs due to pipe diameter mismatch. It is particularly suitable for the repair of complex pipe networks with multiple pipe diameters in trenchless scenarios, further shortening the construction preparation time.

[0126] This utility model adopts a trenchless or minimally excavated mode throughout the entire process. Through the hoisting, splicing, and sealing process of the prefabricated manhole 1, it avoids the drawbacks of traditional repairs that require large-scale road excavation and demolition of the original manhole structure. While ensuring repair quality, it significantly improves the convenience and speed of construction. In particular, in trenchless scenarios, it achieves efficient operation of the entire process of "rapid measurement-rapid assembly-rapid acceptance", providing an efficient and environmentally friendly new repair solution for urban pipeline network operation and maintenance.

[0127] 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 square manhole of a pipe network, characterized in that, It includes a horizontally arranged prefabricated well chamber, a vertical well cylinder eccentrically set on the side wall of the prefabricated well chamber via a connecting structure, and a first connecting pipe sleeve; The prefabricated well chamber includes multiple sets of first well chamber modules and at least one set of second well chamber modules. Each well chamber module can be detached and sealed together to form a cylindrical structure with open ends. The second well chamber module includes a second well chamber module body. Each well chamber assembly has a water pipe connection extending from both ends. The inner wall of each water pipe connection is provided with a first groove. When the two ends of the cylindrical structure are spliced ​​together, the first grooves at the corresponding positions are sealed to form a first sealing groove. One end of the first connecting sleeve is sealed and inserted into the water pipe connection part, and the other end is used for a sealed connection with the corresponding drain pipe. The connecting structure includes a well casing block adapted to the vertical well casing, and a well casing connecting part disposed on the outer wall of the second well casing block body; the well casing block and the well casing connecting part are detachably and sealed together to form a connecting cylinder with one end open, and one end of the vertical well casing is sealed and inserted into the open end of the connecting cylinder.

2. A fabricated repair structure for a square manhole of a pipe network according to claim 1, characterized in that, The various well chamber modules, well cylinder modules, and vertical well cylinders in the prefabricated well chamber are all made of ductile iron.

3. A modular rehabilitation structure for a square manhole of a pipe network according to claim 1 or 2, characterized in that, The first well chamber assembly includes a first well chamber assembly body and connecting plates respectively disposed on both sides of the first well chamber assembly body; the second well chamber assembly body is also provided with the connecting plates on both sides. Each of the connecting plates extends toward the center of the cylindrical structure; Each connecting plate has several connecting holes spaced apart along its length; The adjacent first well chamber assembly, the adjacent second well chamber assembly, and the first well chamber assembly and the second well chamber assembly are detachably bolted together in pairs through corresponding connecting holes to form a whole.

4. The prefabricated repair structure for a square manhole inspection well in a pipeline network according to claim 1 or 2, characterized in that, Expansion seals are provided at the joints of each well chamber assembly to enable detachable and sealed splicing of multiple well chamber assemblies.

5. A modular rehabilitation structure for a square manhole of a pipe network according to claim 1 or 2, characterized in that, The well casing assembly includes a well casing assembly body, with a first cylindrical edge extending from the corresponding outer periphery of the well casing assembly body; a second cylindrical edge extending from the corresponding outer periphery of the well casing connecting part and adapted to the first cylindrical edge; and the first cylindrical edge and the second cylindrical edge are detachably and sealedly connected by fasteners.

6. A fabricated repair structure for a square manhole of a pipe network according to claim 1 or 2, characterized in that The prefabricated repair structure includes two or more vertical shafts, and each vertical shaft is detachably stacked in sequence; adjacent vertical shafts are connected by a three-way or four-way opening clamp. The remaining openings of the three-way or four-way opening clamps are provided with a second connecting sleeve for connection to the drainage branch pipe.

7. A modular rehabilitation structure for a square manhole of a pipe network according to claim 6, characterized in that, One end of each connecting sleeve is fitted with a sealing ring at the corresponding opening; The outer wall at the other end is also provided with a sealing structure for detachable and sealed connection with the corresponding drain pipe / drain branch pipe.

8. A modular rehabilitation structure for a square manhole of a pipe network according to claim 7, characterized in that, The sealing structure includes a second sealing groove disposed on the outer wall of the other end of the connecting tube sleeve, and a second sealing ring disposed within the second sealing groove.

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