Municipal old pipeline repair device and repair method

Abstract

The present invention provides a device for repairing old municipal pipelines, comprising a plurality of support pipes, a plurality of connectors, and a plurality of seals. The support pipes are inserted into the old municipal pipeline to be repaired, the support pipes are of equal diameter, the connectors are arranged in a tubular shape, a top platform is provided in the middle of each connector, the connector on one side of the top platform is inserted into one support pipe, and the connector on the other side of the top platform is inserted into the other support pipe, so that adjacent support pipes are connected and fixed, a plurality of seals are provided between the support pipes and the connectors, the outer wall of the seals abuts the inner wall of the support pipes, and the inner wall of the seals abuts the outer wall of the connectors. The outer diameter of the support pipes of the present invention is equal at all places, and adjacent support pipes are connected using connectors, which effectively reduces the diameter reduction ratio of the repaired pipeline compared to the pipeline before repair, increases the water flow area, and at the same time reduces the size of the gap between the support pipe and the old municipal pipeline to be repaired, thereby reducing the amount of filler required and reducing the repair cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal construction, and more specifically, relates to a municipal old pipeline repair device. The present invention also relates to a municipal old pipeline repair method. Background Art

[0002] In urban construction, over time, corrosion from the surrounding media, vibrations caused by external forces impacting shallow surfaces, human damage, quality issues with pipeline materials, and debris left behind from the laying of old municipal pipelines can cause varying degrees of damage to various underground pipelines, leading to various types of damage and leakage. Once a municipal pipeline has a problem, what we need to do is to repair it.

[0003] In traditional repair technology, old pipelines are repaired using locally excavated operating wells. Non-metallic materials such as cement mortar, resin cement, various plastics, and rubber are mainly applied to the inner wall of the old pipeline to form a solid lining layer after curing. However, this non-metallic lining layer has low strength and may cause secondary pollution to the medium, especially water.

[0004] To improve repair strength and prevent water pollution, the use of ductile iron pipes to repair old municipal pipes is becoming increasingly popular. This technique typically involves inserting a ductile iron pipe with a larger diameter at one end and a smaller diameter at the other into the old concrete pipe. When connecting two adjacent ductile iron pipes, the smaller end of one pipe is inserted into the larger end of the other.

[0005] However, this type of repair also presents significant challenges. First, because the ductile iron pipe must be inserted into the old municipal pipeline, the diameter of the large-diameter end of the pipe cannot be larger than the inner diameter of the municipal pipeline to be repaired. Consequently, the diameter of the small-diameter end must be reduced even more than the diameter of the repaired pipe, resulting in a diameter reduction ratio of more than 15% compared to the original pipe, resulting in a smaller water flow area. Furthermore, the gap between the repaired pipe and the new ductile iron pipe after sleeve insertion is large, requiring a large amount of secondary grouting, which increases the cost of repairing the old municipal pipeline. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for repairing old municipal pipelines to solve the problems of large diameter reduction and high repair cost in the repair of old municipal pipelines using traditional ductile iron pipes.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a municipal old pipeline repair device, comprising multiple support tubes, multiple connecting parts and multiple sealing parts, wherein the support tubes are inserted into the municipal old pipelines to be repaired, and the outer diameters of the support tubes are the same at all places; the connecting parts are arranged in a tubular shape, and a top platform is provided in the middle of each connecting part, the connecting part on one side of the top platform is inserted into one of the support tubes, and the connecting part on the other side of the top platform is inserted into the other support tube, so that the adjacent support tubes are connected and fixed; multiple sealing parts are arranged between the support tubes and the connecting parts, the outer wall of the sealing part abuts against the inner wall of the support tube, and the inner wall of the sealing part abuts against the outer wall of the connecting part, so that the connection between the support tube and the connecting part is sealed.

[0008] In a possible implementation, the sealing member is a sealing rubber ring.

[0009] In a possible implementation, a limiting ring is provided on the outer wall of the connecting member, a limiting groove is provided on the sealing ring, and the limiting ring is provided in the limiting groove.

[0010] In a possible implementation, a limiting ring is provided on the inner wall of the support tube, a limiting groove is provided on the sealing ring, and the limiting ring is provided in the limiting groove.

[0011] In one possible implementation, the sealing ring includes a hard rubber ring and a soft rubber ring connected to each other, the limiting groove is opened on the hard rubber ring, the outer diameter of the soft rubber ring is larger than the inner diameter of the support tube, and the outer diameter of the hard rubber ring is smaller than the inner diameter of the support tube.

[0012] In a possible implementation, the sidewall of the rubber ring is arranged tilted, and the tilt direction is from large to small outer diameter from one end of the soft rubber ring to one end of the hard rubber ring.

[0013] In one possible implementation, the support tube includes a large inner diameter section and a small inner diameter section, the connector is inserted into the large inner diameter section, and the seal abuts against the inner wall of the large diameter section, and the inner diameter of the connector is not smaller than the inner diameter of the small diameter section.

[0014] In a possible implementation, a diameter reducing platform is provided on the outer wall of the connecting member, wherein the maximum diameter of the diameter reducing platform is smaller than the inner diameter of the support tube, and the diameter of the diameter reducing platform is arranged from large to small along the top end of the support member to the top platform;

[0015] A first inclined surface is provided at the top end of the connecting member. In a cross section of the connecting member, the first inclined surface is arranged from low to high from an end away from the top platform to an end close to the top platform.

[0016] The beneficial effects of the municipal old pipeline repair device provided by the present invention are as follows: compared with the prior art, the present invention repairs the municipal old pipeline by using support pipes with the same outer diameter at all locations and inserting them into the municipal old pipeline to be repaired. At the same time, by providing a connector with a top platform in the middle of the connector, one end of the connector is inserted into one support pipe, and the other end of the connector is inserted into the other support pipe, so that two adjacent support pipes are connected and fixed to each other. At the same time, by providing a sealing member between the connector and the support pipe, the outer wall of the sealing member abuts the inner wall of the support pipe, and the inner wall of the sealing member abuts the outer wall of the connecting member, so that the connection between the support pipe and the connecting member is sealed. Compared with the use of traditional ductile iron pipes with a larger diameter at one end and a smaller diameter at the other end for repair, the outer diameter of the support pipes is equal at all locations, and the adjacent support pipes are connected by the connecting member, which effectively reduces the reduction ratio of the repaired pipeline compared to the original pipeline, increases the water flow area, and reduces the size of the gap between the support pipe and the municipal old pipeline to be repaired, thereby reducing the amount of filler required and reducing the repair cost.

[0017] Another object of the present invention is to propose a method for repairing old municipal pipelines, including S1, topographic survey, underground structure survey, and old municipal pipeline survey; S2, arranging supports and excavating working pits; S3, inspecting the original old municipal pipelines to detect defects, diameters, and deflection angles; S4, pre-treating the old municipal pipelines by hole expansion; S5, flushing the ground pipelines with high-pressure flushing equipment; S6, finally determining the length of each interlaced section based on the curvature radius of the original pipeline on site; S7, inserting support pipes into the old municipal pipelines to be repaired, and fixing adjacent support pipes with connectors; S8, performing a water pressure test on the pipelines; and S9, disinfecting the repaired pipelines.

[0018] In a possible implementation, in step S4, a mixture of bentonite and plastic particles is injected into the bottom of the pretreated pipe.

[0019] The beneficial effect of the municipal old pipeline repair device provided by the present invention is that, compared with the prior art, the present invention effectively reduces the diameter reduction ratio of the repaired pipeline compared to the original pipeline by using the aforementioned municipal old pipeline repair device to repair the municipal old pipeline, and can also greatly reduce the repair cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a municipal old pipeline repair device provided by an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Plane view along AA direction;

[0023] Figure 3 for Figure 2 A magnified view of part B;

[0024] Figure 4 Schematic diagram of the structure of the connecting piece provided by the embodiment of the present invention

[0025] Among them, the reference numerals in the figures are as follows:

[0026] 1. Support tube; 2. Connector; 3. Sealing part;

[0027] 101. Large diameter section; 102. Small diameter section;

[0028] 201, top platform; 202, limit ring; 203, diameter reducing platform; 204, first inclined surface;

[0029] 301, hard rubber ring; 302, soft rubber ring. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0032] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] The directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0035] The municipal old pipeline repair device provided by the present invention is now described.

[0036] Example 1

[0037] Please also refer to Figure 1 and Figure 2 The municipal old pipeline repair device includes multiple support tubes 1, multiple connecting parts 2 and multiple sealing parts 3, wherein the support tube 1 is inserted into the old municipal pipeline to be repaired, and the outer diameter of the support tube 1 is the same at all places; the connecting parts 2 are arranged in a tubular shape, and a top platform 201 is provided in the middle of each connecting part 2. The connecting part 2 on one side of the top platform 201 is inserted into one of the support tubes 1, and the connecting part 2 on the other side of the top platform 201 is inserted into the other support tube 1, so that the adjacent support tubes 1 are connected and fixed; multiple sealing parts 3 are arranged between the support tubes 1 and the connecting parts 2, the outer wall of the sealing part 3 abuts against the inner wall of the support tube 1, and the inner wall of the sealing part 3 abuts against the outer wall of the connecting part 2, so that the connection between the support tube 1 and the connecting part 2 is sealed.

[0038] The beneficial effect of the old municipal pipeline repair device provided by this embodiment is: compared with the prior art, the old municipal pipeline repair device provided by this embodiment repairs the old municipal pipeline by using a support tube 1 with the same outer diameter at all places to be inserted into the old municipal pipeline to be repaired, and at the same time, by arranging a connector 2, a top platform 201 is provided in the middle of the connector 2, one end of the connector 2 is inserted into one support tube 1, and the other end of the connector 2 is inserted into another support tube 1, so that the two adjacent support tubes 1 are connected and fixed to each other, and at the same time, a sealing member 3 is arranged between the connecting member and the support tube 1, the outer wall of the sealing member 3 abuts against the inner wall of the support tube 1, and the inner wall of the sealing member 3 abuts against the outer wall of the connector 2, so that the connection between the support tube 1 and the connector 2 is sealed. Compared with the use of traditional ductile iron pipes with a larger diameter at one end and a smaller diameter at the other end for repair, the outer diameter of the support pipe 1 is equal at all places, and adjacent support pipes 1 are connected using connectors 2, which effectively reduces the diameter reduction ratio of the repaired pipe compared to before the repair, increases the water flow area, and at the same time reduces the size of the gap between the support pipe 1 and the old municipal pipe to be repaired, thereby reducing the amount of filler required and reducing the repair cost.

[0039] Based on the above design concept, the sealing member 3 of the present invention is selected as a sealing rubber ring. Due to the good deformation ability of the rubber ring, when in use, the sealant is completely clamped between the connector 2 and the support tube 1, which can achieve a good sealing effect. Of course, in addition to using a sealing rubber ring, the sealing member 3 can also be a suitable method such as hot melt adhesive.

[0040] like Figure 3 and Figure 4 As shown, in a specific embodiment, a limiting ring 202 is provided on the outer wall of the connector 2, and a limiting groove is provided on the sealing rubber ring. The limiting ring 202 is arranged in the limiting groove, so that the sealing rubber ring mounted on the connector 2 is fixed on the connector 2, so that the sealing rubber ring is finally clamped between the connector 2 and the support tube 1 to seal the two.

[0041] Of course, the above is only a preferred embodiment. A limiting ring 202 may be provided on the inner wall of the support tube 1, and a limiting groove may be provided on the sealing ring. The limiting ring 202 is provided in the limiting groove, so that the sealing rubber ring is fixed on the inner wall of the support tube 1, which can also facilitate sealing the connection between the connector 2 and the support tube 1.

[0042] In this embodiment, the sealing ring comprises a hard rubber ring 301 and a soft rubber ring 302, which are interconnected. A retaining groove is defined in the hard rubber ring 301. The outer diameter of the soft rubber ring 302 is larger than the inner diameter of the support tube 1, while the outer diameter of the hard rubber ring 301 is smaller than the inner diameter of the support tube 1. Due to the inherent material properties of the hard rubber ring 301, it is not easily deformed, thus facilitating its engagement with the retaining ring 202, thereby securing the position of the sealing rubber ring. Due to the inherent material properties of the soft rubber ring 302, which is easily deformed, and because its outer diameter is larger than the inner diameter of the support tube 1, it can deform when clamped between the connector 2 and the support tube 1, allowing it to press against the two components, enhancing the seal. Furthermore, the smaller outer diameter of the hard rubber ring 301 than the inner diameter of the support tube 1 facilitates insertion of the connector 2 into the support tube 1 and prevents interference between the hard rubber ring 301 and the support tube 1.

[0043] like Figure 2 and Figure 3 As shown, the rubber ring sidewalls are arranged at an angle, with the outer diameter decreasing from the soft rubber ring 302 to the hard rubber ring 301. This facilitates insertion of the connector 2, with the sealing rubber ring affixed thereto, into the urban pipe. To facilitate insertion of the connector 2 into the support tube 1, a lubricating coating is applied to the inner wall of the support tube 1 and the outer wall of the sealing rubber ring prior to insertion. The lubricating coating can be made of any of petroleum jelly, lubricating oil, or the like.

[0044] It is worth noting that the outer diameter of the top platform 201 of the connecting piece 2 is not larger than the outer diameter of the supporting pipe 1, so that when the connecting piece 2 is inserted into the supporting pipe 1 to fix the two adjacent urban pipes, the top platform 201 will not extend outward to the outside of the supporting pipe 1, which is beneficial to reducing the diameter reduction ratio after the repair of the old municipal pipeline is completed.

[0045] Furthermore, support tube 1 comprises a large inner diameter section and a small inner diameter section. Connector 2 is inserted into the large inner diameter section, and seal 3 abuts the inner wall of large diameter section 101. The inner diameter of connector 2 is no smaller than that of small diameter section 102. The provision of large diameter section 101 provides space for connector 2. Combined with the fact that the inner diameter of support tube 1 is no smaller than that of support tube 1, the inner diameter of the repaired municipal pipeline is the same as that of support tube 1, preventing connector 2 from increasing the diameter reduction ratio.

[0046] As a preferred solution, a reducing platform 203 is provided on the outer wall of the connector 2. The maximum diameter of the reducing platform 203 is smaller than the inner diameter of the support tube 1. The diameter of the reducing platform 203 is arranged from large to small along the top of the support tube to the top platform 201. A first inclined surface 204 is provided on the top of the connector 2. In the cross section of the connector 2, the first inclined surface 204 is arranged from low to high from the end away from the top platform 201 to the end close to the top platform 201. The provision of the reducing platform 203 allows the connector 2 to be twisted a certain angle along the radial direction of the support tube 1 when inserted into the support tube 1 until the reducing platform 203 abuts the inner wall of the support tube 1, which facilitates installation at the bend of old municipal pipelines. At the same time, the provision of the first inclined surface 204 prevents the top of the connector 2 from interfering with the support tube 1 and hindering the twisting of the connector 2.

[0047] Finally, a filling layer is filled between the outer wall of the support pipe 1 and the old municipal pipeline. In this embodiment, the filling layer is made of cement slurry.

[0048] Example 2

[0049] The method for repairing old municipal pipelines of the present invention comprises S1, a topographic survey, an underground structure survey, and an old municipal pipeline survey; S2, arranging supports and excavating a working pit; S3, inspecting the original old municipal pipeline to detect defects, diameters, and deflection angles of the original old municipal pipeline; S4, performing hole enlargement pretreatment on the old municipal pipeline; S5, flushing the ground pipeline using high-pressure flushing equipment; S6, ultimately determining the length of each interlaced section based on the curvature radius of the original pipeline on site; S7, inserting a support pipe 1 into the old municipal pipeline to be repaired, and fixing adjacent support pipes 1 with connectors 2; S8, performing a water pressure test on the pipeline; and S9, disinfecting the repaired pipeline.

[0050] The beneficial effect of the old municipal pipeline repair device provided in this embodiment is: by using the aforementioned old municipal pipeline repair device to repair the old municipal pipeline, the reduction ratio of the repaired pipeline compared to the original pipeline is effectively reduced, and the repair cost can also be greatly reduced.

[0051] Based on the above design principles, in this embodiment, step S1 is designed to minimize the impact on traffic terrain and ensure the safety of the existing pipeline during construction. In step S4, a mixture of bentonite and plastic particles is injected into the bottom of the pretreated pipeline. This facilitates the insertion of support pipe 1 into the existing municipal conduit, reduces drag, and protects the bottom of the ductile iron pipe from wear.

[0052] It is worth noting that the support pipe 1 should be lifted with a sling or special tools, and should be handled with care during loading and unloading. It should be padded and secure during reversal and transportation, and should not collide with each other. Operations should be carried out strictly in accordance with the requirements of protection and fastening to avoid damage to the support pipe 1 and its cement lining and external anti-corrosion coating, so as to protect the inner and outer coatings of the pipe.

[0053] In this embodiment, the pipeline is installed using a crane with manual assistance. Before installation, the support pipe 1 is hoisted approximately 10 cm above the ground to check the binding and braking performance. Lifting is only permitted when it is safe. Lowering the pipe must be supervised by a dedicated person who is familiar with the relevant operating procedures and command signals for mechanical lifting, and the operator must obey these signals. The pipe must be hoisted with a correct center of gravity, hoisted horizontally and gently, and avoid sudden acceleration and deceleration or sudden braking. Damage to the water pipe, protective coating, and cement lining must be avoided. No one is allowed to stand or pass under the hook or the hoisted load within the lifting area.

[0054] Before connecting the support tube 1 and connector 2, the connection area must be cleaned, especially the area where the connector 2's rubber ring is installed. This area must be free of dust, sand, stones, and other debris to prevent damage to the rubber ring and prevent the presence of these impurities from causing large errors and making it difficult to insert the connector 2 into the support tube 1. Additionally, the chamfers should be checked for appropriateness and the smoothness of the sealing surface.

[0055] Next, use a special crowbar to install the sealing rubber ring into the sealing groove of the inner sleeve, ensuring that the sealing rubber ring is properly installed. Apply a lubricant evenly to the inner wall of the socket end face and the outer surface of the rubber ring of the inner sleeve pipe fitting. Do not use detergent, soapy water, or other lubricants that may damage the water quality and the sealing rubber ring.

[0056] Installation can be performed using tools such as wire ropes and fall chains. However, it should be noted that the contact areas between the wire ropes and fall chains and the pipes should be protected with flexible material to avoid damage to the pipe body and the anti-corrosion coating on the inner and outer walls. During the insertion operation, when the axes of the support pipe 1 and the connector 2 are aligned, the installation method can be promoted by jacking.

[0057] When inserting support pipe 1 into the old municipal pipeline, first position and secure the traction machine, jack, and other equipment. Ensure all other equipment and materials are in place, organize personnel at all positions, and ensure smooth communication between the beginning and end. Wipe away dust and water droplets from the surface of support pipe 1 and inspect the pipe wall for scratches and defects. Then, use the jack or traction machine to discontinuously push or pull the support pipe into the concrete pipe.

[0058] Finally, after the insertion is complete, the pipeline is inspected manually and using a system. Once the pipeline is confirmed to be faulty, grouting is performed to fill the gap between support pipe 1 and the old municipal pipeline, creating a pipe-in-pipe structure and ensuring no disturbances after water is passed. The repaired pipeline is then connected to the original pipeline and subjected to a hydrostatic test, strictly adhering to the relevant provisions of GB 50268-2008, "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Projects." Upon passing the test, the pipeline is disinfected and water is allowed to flow.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A municipal old pipeline repair device, characterized in that: include: A plurality of support pipes (1) are inserted into an old municipal pipeline to be repaired, wherein the outer diameters of the support pipes (1) are the same at all locations; A plurality of connecting members (2) are arranged in a tubular shape, and a top platform (201) is provided in the middle of each connecting member (2), the connecting member (2) on one side of the top platform (201) is inserted into one of the support tubes (1), and the connecting member (2) on the other side of the top platform (201) is inserted into another support tube (1), so that adjacent support tubes (1) are connected and fixed; A plurality of sealing members (3) are provided between the support tube (1) and the connecting member (2), wherein the outer wall of the sealing member (3) abuts against the inner wall of the support tube (1), and the inner wall of the sealing member (3) abuts against the outer wall of the connecting member (2), so that the connection between the support tube (1) and the connecting member (2) is sealed; The support tube (1) comprises a large inner diameter section and a small inner diameter section, the connecting piece (2) is inserted into the large inner diameter section, and the sealing piece (3) abuts against the inner wall of the large inner diameter section (101), and the inner diameter of the connecting piece (2) is not less than the inner diameter of the small inner diameter section (102); A diameter reducing platform (203) is provided on the outer wall of the connecting member (2), the maximum diameter of the diameter reducing platform (203) is smaller than the inner diameter of the support tube (1), and the diameter of the diameter reducing platform (203) is arranged from large to small along the top of the diameter reducing platform (203) to the top platform (201); A first inclined surface (204) is provided at the top end of the connecting member (2). In a cross section of the connecting member (2), the first inclined surface (204) is arranged from low to high from an end away from the top platform (201) to an end close to the top platform (201).

2. The municipal old pipeline repair device according to claim 1, characterized in that: The sealing member (3) is a sealing rubber ring.

3. The municipal old pipeline repair device according to claim 2, characterized in that: A limiting ring (202) is provided on the outer wall of the connecting member (2), a limiting groove is provided on the sealing rubber ring, and the limiting ring (202) is arranged in the limiting groove.

4. The municipal old pipeline repair device according to claim 2, characterized in that: A limiting ring (202) is provided on the inner wall of the support tube (1), a limiting groove is provided on the sealing rubber ring, and the limiting ring (202) is arranged in the limiting groove.

5. The municipal old pipeline repair device according to any one of claims 3-4, characterized in that: The sealing rubber ring comprises a hard rubber ring (301) and a soft rubber ring (302) connected to each other, the limiting groove is provided on the hard rubber ring (301), the outer diameter of the soft rubber ring (302) is larger than the inner diameter of the support tube (1), and the outer diameter of the hard rubber ring (301) is smaller than the inner diameter of the support tube (1).

6. The municipal old pipeline repair device according to claim 5, characterized in that: The side wall of the sealing rubber ring is arranged tilted, and the tilting direction is from the outer diameter of one end of the soft rubber ring (302) to the outer diameter of one end of the hard rubber ring (301) from large to small.

7. A method for repairing old municipal pipelines using the repair device according to any one of claims 1 to 6, characterized in that: S1. Topographic survey, underground structure survey, and municipal old pipeline survey; S2. Arrange support and excavate the working pit; S3. Inspect the existing municipal pipelines to check for defects, diameters, and deflection angles. S4. Carry out hole enlargement pretreatment on old municipal pipelines; S5. Use high-pressure flushing equipment to flush the ground pipes; S6. Finalize the length of each interlaced section based on the original pipeline curvature radius on site; S7, inserting the support pipe (1) into the old municipal pipeline to be repaired, and fixing adjacent support pipes (1) with connectors (2); S8. Conduct a water pressure test on the pipeline; S9. Disinfect the repaired pipeline.

8. The method for repairing old municipal pipelines according to claim 7, characterized in that: In step S4, a mixture of bentonite and plastic particles is injected into the bottom of the pretreated pipe.

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