A rigid support repair construction method for a damaged part of an old municipal drainage pipeline

Abstract

The application relates to the technical field of pipeline repair, and aims at the problem of difficult repair of a damaged part of a traditional municipal drainage pipeline, and provides a rigid support repair construction method for a damaged part of an old municipal drainage pipeline, wherein a telescopic pipe is arranged, the two ends of the telescopic pipe are sleeved with sealing rubber rings, and an opening assembly for driving the telescopic pipe to open is further arranged in the telescopic pipe; when the pipeline is repaired, the telescopic pipe is moved to the adjacent pipeline socket joint, and the sealing rubber rings at the two ends of the telescopic pipe are respectively located in the adjacent pipelines; the opening assembly drives the telescopic pipe to open until the sealing rubber rings at the two ends of the telescopic pipe are tightly pressed against the corresponding pipelines; the opened telescopic pipe and the sealing rubber rings at the two ends are used to seal the leakage of the socket joint of the adjacent pipelines; meanwhile, the telescopic pipe can limit the dislocation of the connection part of the adjacent pipelines caused by external load. The application has the effect of making the repair of the damaged part of the pipeline more simple and convenient.

Description

Technical Field

[0001] This application relates to the technical field of municipal pipeline repair construction, and in particular to a rigid support repair construction method for damaged sections of old municipal drainage pipelines. Background Technology

[0002] During subway construction, it is necessary to carry out underground excavation and initial support arch construction at the bottom of municipal drainage pipe 1. This construction will inevitably disturb the soil surrounding pipe 1 (e.g., Figure 1 (As shown). Currently, most municipal drainage pipes are socket pipe structures. Due to years of disrepair and prolonged exposure to road surface loads, the socket joints of adjacent pipes 1 are prone to damage, leading to leaks. In addition, the construction of the initial support arch under the subway tunnel can further aggravate the damage at the socket joints of adjacent pipes 1, potentially causing sand and water inrushes during subway tunnel construction. Therefore, timely repair of damaged areas is necessary to reduce the occurrence of such hazards.

[0003] Current common repair methods usually require first breaking up and excavating the road surface, then repairing the damaged joints of adjacent pipes, and finally re-pouring the road surface after the repair is completed. This method is difficult to implement and has a long construction period, so there is room for improvement. Summary of the Invention

[0004] To make the repair of damaged joints of adjacent pipes simpler and more convenient, this application provides a rigid support repair method for damaged sections of old municipal drainage pipes.

[0005] This application provides a rigid support repair method for damaged sections of old municipal drainage pipes, employing the following technical solution:

[0006] A method for rigid support repair of damaged sections of old municipal drainage pipes includes the following steps:

[0007] S1: Prefabricated expansion tube, wherein an opening component is provided inside the expansion tube to drive the expansion tube to open, and sealing rings are coaxially sleeved at both ends of the expansion tube.

[0008] S2: Temporarily seal the pipe to be repaired and pump out the sewage inside the pipe;

[0009] S3: Expansion / shrink tube installation: Move the expansion / shrink tube to the socket of the adjacent pipe and ensure that the sealing rings at both ends of the expansion / shrink tube are located inside the adjacent pipe.

[0010] S4: The expansion tube is fully opened by the opening component, and the two sets of sealing rings are pressed against the inner wall of the adjacent pipe by the fully opened expansion tube.

[0011] The expansion tube includes several arc-shaped plates, the number of which is even. Each adjacent arc-shaped plate is connected to a rubber plate, and the arc-shaped plates and rubber plates are enclosed to form a tubular structure.

[0012] By adopting the above technical solution, the expansion and contraction tube is moved to the socket joint of the adjacent pipe, and the sealing rings at both ends of the expansion and contraction tube are located inside the adjacent pipe. The expansion and contraction tube is driven to open by the opening component, and the opening expansion and contraction tube presses the sealing rings against the inner wall of the pipe. The opening expansion and contraction tube and the sealing rings at both ends are used to seal the damage at the socket joint of the adjacent pipe. At the same time, the expansion and contraction tube can be corrected for the pipe that has been displaced due to ground load during the opening process. In the future, the opening expansion and contraction tube can also be used to improve the overall rigidity at the socket joint of the adjacent pipe, limiting the possibility of pipe displacement due to subway tunnel construction.

[0013] Preferably, the opening component includes a positioning tube, and a plurality of driving rods are inserted through the positioning tube corresponding to a plurality of arc-shaped plates on its outer periphery. The end of the driving rod away from the positioning tube is connected to the arc-shaped plate, and the positioning tube is also provided with a locking part to restrict the sliding of the driving rod.

[0014] By adopting the above technical solution, before moving the expansion tube into the pipeline, the drive rod can be moved closer to the positioning tube, so that several arc-shaped plates move closer to each other, which facilitates the movement of the expansion tube inside the pipeline. After the expansion tube is moved into place, the drive rod is moved sequentially away from the positioning tube. The drive rod drives the corresponding arc-shaped plates to move towards the pipe wall. When the drive rod drives the arc-shaped plates to press the sealing ring against the inner wall of the pipeline, the movement of the drive rod is restricted by the locking part. This allows the expansion tube and the sealing ring to cooperate in sealing the gap at the socket of the adjacent pipeline, making the opening of the expansion tube simpler and more convenient.

[0015] Preferably, the locking part includes a limiting rod inserted into the positioning tube, and the driving rod has a limiting hole corresponding to the limiting rod for the limiting rod to be inserted into. When the limiting rod is inserted into the corresponding limiting hole, the arc plate presses the sealing ring against the inner wall of the pipe.

[0016] By adopting the above technical solution, the moving drive rod causes the arc plate to press the sealing ring against the inner wall of the pipe. After the drive rod is inserted into the limiting hole on the drive rod, the sliding of the drive rod can be restricted, so that the arc plate can always press the sealing ring against the inner wall of the pipe. On the one hand, it can seal the damaged parts at the socket joint of adjacent pipes, and on the other hand, it can help to restrict the misalignment of adjacent pipes by opening the expansion and contraction tube, thereby improving the connection rigidity of adjacent pipes.

[0017] Preferably, a double-headed hydraulic cylinder is also provided inside the positioning tube;

[0018] The specific steps for step S4 are as follows:

[0019] S4.1: Rotate the double-headed hydraulic cylinder so that the piston rods at both ends of the double-headed hydraulic cylinder are respectively aligned with the two sets of drive rods;

[0020] S4.2: The double-headed hydraulic cylinder sequentially drives the piston rods at both ends to extend, thereby driving the two opposing drive rods to move away from each other until the drive rods drive the corresponding arc-shaped plates to press the sealing ring against the inner wall of the pipe;

[0021] S4.3: Insert the limiting rod on the positioning tube into the corresponding limiting hole to limit the drive rod;

[0022] S4.4: Repeat S4.1 to S4.3 until all the curved plates have pressed the sealing rings against the inner wall of the pipe.

[0023] By adopting the above technical solution, the double-headed hydraulic cylinder is moved into the positioning tube and the piston rods at both ends of the double-headed hydraulic cylinder are respectively aligned with the two opposite drive rods. The double-headed hydraulic cylinder sequentially drives the piston rods at both ends to extend, which simultaneously drives the two opposite drive rods to move the arc plate to press the sealing ring against the inner wall of the pipe, realizing the rapid opening of the expansion and contraction tube, making the sealing of the damaged joint of the adjacent pipe more simple and convenient.

[0024] Preferably, the following steps are also included:

[0025] S5: Inject sealant into the annular cavity formed at the end of the expansion joint, the sealing ring, and the inner wall of the pipe.

[0026] By adopting the above technical solution, the gap between the end of the expansion tube, the sealing ring and the inner wall of the pipe is sealed with sealant, which further improves the sealing performance of the gap between the expansion tube and the inner wall of the pipe, making it less likely for sewage in the pipe to flow out from the socket of the adjacent pipe through the gap between the expansion tube and the pipe.

[0027] Preferably, the positioning tube is rotatably connected to a support rod, the length direction of the support rod is perpendicular to the axis of the positioning tube, the rotation axis of the support rod coincides with the axis of the positioning tube, and the double-headed hydraulic cylinder is provided with an ear plate, which is fixed to the support rod by bolts.

[0028] By adopting the above technical solution, simply rotating the double-headed hydraulic cylinder allows the piston rods at both ends to quickly align with the ends of any two opposing sets of drive rods, achieving rapid positioning of the double-headed hydraulic cylinder. This facilitates the piston rods at both ends of the double-headed hydraulic cylinder to drive the opposing drive rods sequentially, causing the arc-shaped plate to press the sealing ring tightly against the inner wall of the pipe, further improving the efficiency of pipe repair. The ear plate, fixed to the support rod with bolts, prevents the double-headed hydraulic cylinder from popping out between the opposing drive rods during the pushing process, thus avoiding any impact on construction safety.

[0029] Preferably, the positioning tube has an annular groove coaxially formed on its inner circumference, and both ends of the support rod are inserted into the annular groove. The positioning tube has two sets of insertion grooves corresponding to the two ends of the support rod. One end of the insertion groove is connected to the annular groove, and the end of the insertion groove away from the annular groove is open.

[0030] By adopting the above technical solution, the support rod can be detached from the positioning tube. After fixing the double-headed hydraulic cylinder to the support rod, the two ends of the support rod are first inserted into the corresponding insertion slots and moved towards the annular groove until the two ends of the support rod are inserted into the annular groove, thus achieving a rotatable connection of the support rod to the positioning tube. When removing the support rod, rotate the support rod until the two ends of the support rod are respectively aligned with the two sets of insertion slots, and then move the support rod out of the positioning tube along the insertion slots. This facilitates the installation and removal of the support rod and the double-headed hydraulic cylinder from the positioning tube. On the one hand, it facilitates the reuse of the support rod and the double-headed hydraulic cylinder, and on the other hand, it reduces the possibility of the support rod and the double-headed hydraulic cylinder remaining in the positioning tube and affecting the subsequent water flow in the pipeline.

[0031] Preferably, a number of diagonal braces are also provided between the arc-shaped plate and the drive rod.

[0032] By adopting the above technical solution and setting up the diagonal brace, the connection strength between the arc plate and the drive rod can be improved.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. By installing an expansion joint with sealing rings at both ends, and an opening component inside the expansion joint to drive it open, when repairing the pipeline, the expansion joint is moved to the socket joint of the adjacent pipeline, and the sealing rings at both ends of the expansion joint are located in the adjacent pipeline. The opening component drives the expansion joint to open, and the expansion joint presses the sealing rings against the corresponding pipeline. The opened expansion joint and the sealing rings at both ends work together to seal the socket joint of the adjacent pipeline, preventing sewage from leaking from the socket joint of the adjacent pipeline. At the same time, the opened expansion joint can limit the displacement of the adjacent pipeline and improve the connection rigidity of the socket joint of the adjacent pipeline.

[0035] 2. A support rod is rotatably connected via a positioning tube. The double-headed hydraulic cylinder is equipped with ear plates, which are fixed to the support rod with bolts. This facilitates the rotation of the double-headed hydraulic rod so that its two ends quickly align with the two sets of drive rods. This allows the double-headed hydraulic rod to drive the two sets of drive rods to move the corresponding arc-shaped plates to press the sealing ring against the inner wall of the pipe. On the other hand, it restricts the displacement of the double-headed hydraulic cylinder, reducing the possibility of it popping out between the two sets of drive rods when the double-headed hydraulic cylinder lifts them.

[0036] 3. An annular groove is coaxially formed inside the positioning tube. The two ends of the support rod are inserted into the annular groove. Two sets of insertion grooves are formed on the inner circumference of the positioning tube corresponding to the two ends of the support rod. One end of the insertion groove is connected to the annular groove, and the end of the insertion groove away from the annular groove is open, so that the support rod can slide into or out of the annular groove through the insertion groove. This allows the support rod and the double-headed hydraulic cylinder to be installed and removed from the positioning tube. Subsequently, the support rod and the double-headed hydraulic cylinder can be removed from the positioning ring in a timely manner, which helps to reduce the situation where the support rod and the jack restrict the flow of water in the subsequent pipeline. Attached Figure Description

[0037] Figure 1 This is a schematic diagram used in this application to illustrate the location of underground tunnels and pipelines in the background art.

[0038] Figure 2 This is a schematic diagram illustrating the structure of the expansion tube and the opening assembly in the embodiments of this application.

[0039] Figure 3 yes Figure 1 Enlarged schematic diagram of part A in the middle.

[0040] Figure 4 This is a schematic diagram illustrating the internal structure of the opening component in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Pipe; 2. Curved plate; 21. Rubber plate; 3. Sealing ring; 4. Positioning tube; 40. Perforation; 41. Drive rod; 411. Diagonal brace; 412. Fixing plate; 42. Limiting rod; 43. Insertion hole; 44. Limiting hole; 45. Insertion groove; 46. Annular groove; 5. Support rod; 6. Double-headed hydraulic cylinder; 61. Ear plate. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0044] This application discloses a method for rigid support repair of damaged sections in old municipal drainage pipes, referring to... Figure 2 and Figure 3 This includes the following steps:

[0045] S1: Prefabricated expansion tube, with an opening component inside the expansion tube to drive the expansion tube to open, and sealing rings 3 are coaxially sleeved at both ends of the expansion tube.

[0046] S2: Temporarily seal the pipe 1 to be repaired, pump out the remaining sewage in the pipe 1 using a water pump, and clean up the debris in the pipe 1.

[0047] It is worth noting that before construction personnel enter the pipeline 1 to be repaired, they should first check the concentration of harmful gases in the pipeline 1 using a gas detector. Only when the concentration of harmful gases reaches the level that allows personnel to enter the pipeline 1 can they enter to work.

[0048] S3: Expansion / shrink tube installation: Move the expansion / shrink tube to the socket of the adjacent pipe 1 and ensure that the sealing rings 3 at both ends of the expansion / shrink tube are located inside the adjacent pipe 1. Before moving the expansion / shrink tube, first put the sealing rings 3 on both ends of the expansion / shrink tube, and then hoist the expansion / shrink tube into the pipe 1 through the nearest inspection well.

[0049] S4: The expansion tube is fully opened by the opening component, and the two sets of sealing rings 3 are pressed against the inner wall of the adjacent pipe 1 by the fully opened expansion tube.

[0050] S5: Inject sealant into the annular cavity formed by the end of the expansion tube, the sealing ring 3, and the inner wall of the pipe 1. In this embodiment, the sealant is a UV sealant. After the sealant is filled, it should be cured by an ultraviolet lamp in a timely manner.

[0051] Reference Figure 2 and Figure 3 The expansion and contraction tube includes four sets of arc-shaped plates 2 evenly arranged around each other. A rubber plate 21 is bonded between each pair of adjacent arc-shaped plates 2. The axes of the four sets of rubber plates 21 and the four sets of arc-shaped plates 2 are all coincident. The four sets of rubber plates 21 and the four sets of arc-shaped plates 2 enclose each other to form a tubular structure.

[0052] Reference Figure 2 and Figure 3 The opening assembly includes a positioning tube 4 coaxially arranged within an expansion tube. The axis of the positioning tube 4 coincides with the axis of the arc-shaped plate 2. Four sets of driving rods 41 are slidably inserted through the four sets of arc-shaped plates 2 on the outer periphery of the positioning tube 4. Four sets of through holes 40 are formed on the outer periphery of the positioning tube 4 corresponding to the four sets of arc-shaped plates 2, and the four sets of driving rods 41 are slidably inserted into the corresponding through holes 40. The axes of the four sets of driving rods 41 are all oriented towards the axis of the positioning tube 4, and the axes of the driving rods 41 are perpendicular to the axis of the positioning tube 4. The end of the driving rod 41 away from the positioning tube 4 is fixedly connected to the concave surface of the corresponding arc-shaped plate 2. The positioning tube 4 is also provided with a locking element to restrict the sliding of the driving rods 41.

[0053] Reference Figure 3 and Figure 4Two sets of diagonal braces 411 are fixed between the drive rod 41 and the arc-shaped plate 2. In this embodiment, both the drive rod 41 and the arc-shaped plate 2 are square tubes. The two sets of diagonal braces 411 are located on opposite sides of the drive rod 41. The diagonal braces 411 help to improve the connection strength between the drive rod 41 and the arc-shaped plate 2. The two sets of diagonal braces 411 and the drive rod 41 are evenly distributed radially along the arc-shaped plate 2, which helps to reduce the possibility of the two sets of diagonal braces 411 and the drive rod 41 blocking the water flow in the pipe later. A fixing plate 412 is fixed to one end of the drive rod 41 inside the positioning tube 4.

[0054] Reference Figure 2 and Figure 3 The locking component includes a limiting rod 42 that slides into the end of the positioning tube 4. A insertion hole 43 is provided at the end of the positioning tube 4 corresponding to the limiting rod 42. The insertion hole 43 communicates with the through hole 40, and the limiting rod 42 slides into the corresponding insertion hole 43. A limiting hole 44 is provided on the outer periphery of the driving rod 41 corresponding to the limiting rod 42, allowing the limiting rod 42 to be inserted. The limiting hole 44 communicates with the insertion hole 43. When the limiting rod 42 is inserted into the limiting hole 44, the driving rod 41 drives the arc-shaped plate 2 to press the sealing ring 3 against the inner wall of the pipe 1.

[0055] Reference Figure 2 and Figure 3 When the expansion tube needs to be opened, four sets of drive rods 41 are moved sequentially towards the inner wall of pipe 1 until the four sets of arc plates 2 press the sealing rings 3 against the inner wall of pipe 1. Then, the limiting rods 42 are inserted into the corresponding limiting holes 44, which allows the expansion tube to open and press the sealing rings 3 against the inner wall of pipe 1. The opening expansion tube and the sealing rings 3 at both ends of the expansion tube cooperate to seal the damaged joint of the adjacent pipe 1.

[0056] Reference Figure 3 and Figure 4 A support rod 5 is rotatably connected inside the positioning tube 4. The length direction of the support rod 5 intersects and is perpendicular to the axis of the positioning tube 4, and the rotation axis of the support rod 5 coincides with the axis of the positioning tube 4. A double-headed hydraulic cylinder 6 is also provided on the support rod 5. In this embodiment, the double-headed hydraulic cylinder 6 is composed of two independent hydraulic cylinders facing opposite directions. The double-headed hydraulic cylinder 6 is used to drive the drive rod 41 to slide. A lug plate 61 is provided on the outer periphery of the double-headed hydraulic cylinder 6. The lug plate 61 is fixed to the support rod 5 by bolts, realizing a detachable connection between the double-headed hydraulic cylinder 6 and the support rod 5.

[0057] Reference Figure 3 and Figure 4 In step S4, the specific operation steps are as follows:

[0058] S4.1: Rotate the double-headed hydraulic cylinder 6 so that the piston rods at both ends of the double-headed hydraulic cylinder 6 are respectively close to each other with one end facing the two sets of drive rods 41;

[0059] S4.2: The double-headed hydraulic cylinder 6 sequentially drives the piston rods at both ends to extend, thereby driving the corresponding drive rods 41 to move away from the positioning tube 4, until the drive rods 41 drive the corresponding arc plate 2 to press the sealing ring 3 against the inner wall of the pipe 1.

[0060] S4.3: The limiting rod 42 at the end of the sliding positioning tube 4 is inserted into the limiting hole 44 on the corresponding driving rod 41 to limit the driving rod 41;

[0061] S4.4: Repeat S4.1 to S4.3 until all four sets of arc plates 2 have the sealing rings 3 pressed tightly against the inner wall of the pipe 1.

[0062] Reference Figure 3 and Figure 4 With the double-headed hydraulic cylinder 6, a single operation can drive two opposing drive rods 41 to move their respective arc plates 2, pressing the sealing ring 3 against the inner wall of the pipe 1, facilitating rapid expansion and contraction of the pipe. A support rod 5 is rotatably connected inside the positioning tube 4. The ear plate 61 on the double-headed hydraulic cylinder 6 is bolted to the support rod 5. This serves two purposes: firstly, it limits the movement of the double-headed hydraulic cylinder 6, preventing it from popping out between the opposing drive rods 41 when they slide; secondly, by rotating the double-headed hydraulic cylinder 6, it can be quickly moved to a position where it is close to one end of the opposing drive rods 41, facilitating rapid positioning. This allows the four drive rods 41 to quickly move their respective arc plates 2, pressing the sealing ring 3 against the inner wall of the pipe 1, thus improving the efficiency of pipe repair.

[0063] Reference Figure 3 and Figure 4 The positioning tube 4 has an annular groove 46 coaxially formed on its inner circumference. The two ends of the support rod 5 are inserted into the annular groove 46. Both ends of the support rod 5 are arc-shaped, which helps to reduce the friction between the support rod 5 and the annular groove 46 and facilitates the support rod 5 to rotate more smoothly in the positioning tube 4.

[0064] Reference Figure 3 and Figure 4The positioning tube 4 has insertion slots 45 on both sides, with two sets of insertion slots 45 arranged opposite each other. These slots are used for inserting both ends of the support rod 5. The length of the insertion slot 45 is parallel to the axis of the positioning tube 4. One end of the insertion slot 45 connects to the annular groove 46, and the end of the insertion slot 45 furthest from the annular groove 46 is open. The two sets of insertion slots 45 allow the support rod 5 to be detachably connected to the positioning tube 4. When installing the support rod 5, both ends of the support rod 5 are inserted into the two sets of insertion slots 45, and then moved along the insertion slots 45 towards the annular groove 46 until both ends of the support rod 5 are inserted into the annular groove 46, thus allowing the support rod 5 to be rotatably connected to the annular groove 46. When it is necessary to remove the support rod 5, rotate the support rod 5 until both ends of the support rod 5 are aligned with the two sets of insertion slots 45, and then move the support rod 5 away from the annular groove 46 along the insertion slots 45 until the support rod 5 is disengaged from the positioning tube 4, so that the support rod 5 and the double-headed hydraulic cylinder 6 can be detachably connected to the positioning tube 4. After the expansion tube is pressed against the sealing ring 3 against the inner wall of the pipe 1, the support rod 5 and the double-headed hydraulic rod can be removed from the positioning tube 4 in time, which helps to reduce the situation where the support rod 5 and the jack block the flow of water in the pipe 1 when water is flowing through the pipe 1.

[0065] The implementation principle of this application embodiment is as follows:

[0066] Before repairing pipe 1, temporarily seal pipe 1 and clean out any debris inside. Move four sets of drive rods 41 toward the axis of positioning tube 4, insert two sets of sealing rings 3 into both ends of the expansion tube, and then move the expansion tube to the socket of the adjacent pipe 1.

[0067] Rotate the double-headed hydraulic cylinder 6 so that the piston rods at both ends of the double-headed hydraulic cylinder 6 are aligned with the two sets of opposing drive rods 41. The double-headed hydraulic cylinder 6 drives the two sets of opposing drive rods 41 to slide until the drive rods 41 drive the arc-shaped plate 2 to press the sealing ring 3 against the inner wall of the pipe 1. Then the double-headed hydraulic cylinder 6 is reset and rotated to be aligned with the remaining two opposing drive rods 41. Repeat the above steps until the other two sets of drive rods 41 drive the corresponding arc-shaped plate 2 to press the sealing ring 3 against the inner wall of the pipe 1.

[0068] Sealant is injected into the annular cavity formed by the end of the expansion tube, the sealing ring 3, and the inner wall of the pipe 1. The expanded expansion tube and the sealing rings 3 at both ends of the expansion tube are used to seal the damage at the socket joint of the adjacent pipe 1. At the same time, the expanded expansion tube is used to increase the strength at the socket joint of the adjacent pipe 1, limiting the displacement of the two adjacent sets of pipes 1 under external load.

[0069] 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 method for rigid support repair of damaged sections of old municipal drainage pipes, characterized in that: Includes the following steps: S1: Prefabricated expansion tube, wherein an opening component is provided inside the expansion tube to drive the expansion tube to open, and sealing rings (3) are coaxially sleeved at both ends of the expansion tube; S2: Temporarily seal the pipe (1) to be repaired and pump out the sewage in the pipe (1); S3: Installation of expansion and contraction tube: Move the expansion and contraction tube to the socket of the adjacent pipe (1) and make the sealing rings (3) at both ends of the expansion and contraction tube located in the adjacent pipe (1) respectively; S4: The expansion tube is fully opened by the opening component, and the two sets of sealing rings (3) are pressed against the inner wall of the adjacent pipe (1) by the fully opened expansion tube. The expansion tube includes several arc-shaped plates (2), the number of which is even, and a rubber plate (21) is connected between adjacent arc-shaped plates (2). The several arc-shaped plates (2) and the rubber plate (21) enclose each other to form a tubular structure. The opening component includes a positioning tube (4), and a plurality of driving rods (41) are provided on the outer periphery of the positioning tube (4) corresponding to a plurality of arc plates (2). The end of the driving rod (41) away from the positioning tube (4) is connected to the arc plate (2). The positioning tube (4) is also provided with a locking part to restrict the sliding of the driving rod (41). The locking part includes a limiting rod (42) inserted into the positioning tube (4). The driving rod (41) has a limiting hole (44) for the limiting rod (42) to be inserted into. When the limiting rod (42) is inserted into the corresponding limiting hole (44), the arc plate (2) presses the sealing ring (3) against the inner wall of the pipe (1). The positioning tube (4) is also equipped with a double-headed hydraulic cylinder (6); a support rod (5) is rotatably connected to the positioning tube (4), the length direction of the support rod (5) is perpendicular to the axis of the positioning tube (4), the rotation axis of the support rod (5) coincides with the axis of the positioning tube (4), the double-headed hydraulic cylinder (6) is equipped with an ear plate (61), and the ear plate (61) is fixed to the support rod (5) by bolts; The positioning tube (4) has an annular groove (46) coaxially formed on its inner circumference. Both ends of the support rod (5) are inserted into the annular groove (46). The positioning tube (4) has two sets of insertion grooves (45) corresponding to the two ends of the support rod (5). One end of the insertion groove (45) is connected to the annular groove (46), and the end of the insertion groove (45) away from the annular groove (46) is open. The specific steps for step S4 are as follows: S4.1: Rotate the double-headed hydraulic cylinder (6) so that the piston rods at both ends of the double-headed hydraulic cylinder (6) are respectively opposite to the two sets of drive rods (41); S4.2: The double-headed hydraulic cylinder (6) sequentially drives the piston rods at both ends to extend, thereby driving the two opposing drive rods (41) to move away from each other until the drive rods (41) drive the corresponding arc plate (2) to press the sealing ring (3) against the inner wall of the pipe (1); S4.3: Insert the limiting rod (42) on the positioning tube (4) into the corresponding limiting hole (44) to limit the driving rod (41); S4.4: Repeat S4.1 to S4.3 until all the arc plates (2) press the sealing rings (3) against the inner wall of the pipe (1).

2. The method for rigid support repair of damaged sections of old municipal drainage pipes according to claim 1, characterized in that: It also includes the following steps: S5: Inject sealant into the annular cavity formed at the end of the expansion tube, the sealing ring (3), and the inner wall of the pipe (1).

3. The method for rigid support repair of damaged sections of old municipal drainage pipes according to claim 1, characterized in that: Several diagonal braces (411) are also provided between the arc plate (2) and the drive rod (41).

Images