Construction method for blocking leakage of old rain and sewage pipe network in municipal engineering

Abstract

The invention provides a construction method for blocking leakage of an old rain and sewage pipe network in municipal engineering, which comprises the following steps of: firstly, feeding an internal blocking rubber belt into a corresponding position of a leakage part in a pipeline by using an air bag, and adhering the internal blocking rubber belt into the pipeline by utilizing the expansion of the air bag; secondly, pre-winding and temporarily fixing the corresponding position of the external leakage part of the pipeline by using an external plugging rubber belt, and filling a cavity part between the internal plugging rubber belt and the external plugging rubber belt with a damaged filler; after the damaged filler is solidified, the external plugging rubber belt is further wound, and the external plugging rubber belt is reinforced through the reinforcing binding belt; and finally, the air bag and the internal plugging rubber belt are pulled out from the interior of the pipeline, pipeline backfilling is conducted, and plugging construction of pipeline leakage is completed. The problems that in the conventional pipeline leakage repairing process, the device is complex in structure, difficult to operate, poor in adaptability and the like are solved, and the device has the advantages of being rapid to install, improving construction efficiency, reducing construction cost and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of water pipe plugging, and specifically relates to a construction method for plugging leakage of old rainwater and sewage pipe networks in municipal engineering. Background Art

[0002] Due to the limitations of early urban construction design, construction technology, materials, etc., the aging of urban drainage systems, uneven road settlement, the construction and renovation of underground pipelines, and other disturbances and damage to old pipelines, the interfaces of old urban pipelines have fallen off and leaked, the pipe walls have been damaged, and the airtightness of the pipelines has been destroyed. As a result, rainwater and sewage in the drainage pipes have seeped into the soil around the pipes during use, eroding the soil layer. When the water flow in the pipe is large, the eroded soil layer is carried away by the water flow, causing urban roads to collapse and even large-scale collapse, posing a huge safety hazard.

[0003] The usual way to deal with leakage in old rainwater and sewage pipes includes removing and replacing the original pipes, and then using concrete to fill the interfaces. This approach will not only destroy the flexible connection of the pipe network, but also cause serious damage to the road surface. Road backfilling and repairing increase the workload and affect construction efficiency.

[0004] Based on this, it is a technical problem that needs to be solved urgently to provide a construction method for sealing leakage in old rainwater and sewage pipe networks in municipal projects, which can maintain flexible connection of the pipe network, has a small scope of damage to the road surface, is simple to operate, and has high construction efficiency. Summary of the invention

[0005] The purpose of the present invention is to address the shortcomings of the prior art and provide a construction method for sealing leakage in old rainwater and sewage pipe networks in municipal engineering projects, which can maintain flexible connection of the pipe network, has a small scope of damage to the road surface, is simple to operate, and has high construction efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: providing a construction method for plugging leakage of old rainwater and sewage pipe networks in municipal engineering, comprising the following steps: S1. Confirm the leakage location and burial depth of the drainage pipe, fully expose the leakage location of the drainage pipe, and dig out an operating space under the leakage location; S2. Use the airbag to send the inner sealing rubber belt to the corresponding position of the leakage part inside the pipeline, use the expansion of the airbag to fill the entire pipeline section and stick the inner sealing rubber belt to the inside of the pipeline; S3. Use an external sealing rubber band to pre-wrap and temporarily fix the corresponding position of the external leakage part of the pipeline, and inject the damaged filler into the empty space between the internal sealing rubber band and the external sealing rubber band to fill it; S4. After the damaged filler is solidified, the external sealing rubber band is further wound, the winding end is fixed, and a reinforcing tie is used to wind the external sealing rubber band in the opposite winding direction to the external sealing rubber band to reinforce the external sealing rubber band; S5. Pull out the airbag and the inner plugging rubber belt from the inside of the pipeline, retain the outer plugging rubber belt and the reinforcing rolled belt, and backfill the pipeline to complete the plugging construction of pipeline leakage.

[0007] The general idea of ​​the present invention is as follows: The device used in the construction method provided by the present invention includes: an inner sealing rubber belt, an outer sealing rubber belt, a reinforcing tie, an airbag and a damaged filler. First, the inner sealing rubber belt is sent into the interior of the pipeline by using the airbag, and the inner sealing rubber belt is made to fit under the leakage part inside the pipeline by the expansion of the airbag, and the inner sealing rubber belt can apply a layer of inner support to the damaged part inside the pipeline; secondly, the outer sealing rubber belt is used to pre-wrap and temporarily fix the corresponding position of the leakage part outside the pipeline, and the damaged filler is used to fill the empty part between the inner sealing rubber belt and the outer sealing rubber belt; then, the outer sealing rubber belt is further wrapped, the winding end is fixed, and the reinforcing tie is used to reinforce it. In the present invention, the internal sealing rubber belt and the external sealing tape are used to wrap the interfaces and water seepage parts of the old pipe network, and the filling effect of the damaged filler is cooperated, and then the external sealing rubber belt is reinforced and sealed by the reinforcing tie, so that the water seepage parts are effectively sealed while ensuring the flexible connection of the pipeline; finally, the airbag and the internal sealing rubber belt are pulled out from the inside of the pipeline, and the external sealing rubber belt and the reinforcing rolled belt are retained. The sealing structure formed by the reinforcing tie, the external sealing tape and the damaged filler of the present invention forms a flexible and tight connection with the old pipe network, and while effectively sealing the pipeline leakage, the road surface damage range is small, the construction efficiency is high, and the maintenance quality is ensured.

[0008] Furthermore, the inner sealing rubber band and the outer sealing rubber band are both made of soft rubber.

[0009] Preferably, the soft rubber includes one or more combinations of silicone rubber, chloroprene rubber, fluororubber, and EPDM rubber.

[0010] Furthermore, the thickness of the inner sealing rubber belt is 4-6 mm, and the thickness of the outer sealing rubber belt is 8-12 mm. In the present invention, considering that the inner sealing rubber belt is only used to support and contact the damaged filler and is not retained in the pipeline at a later time, its thickness is thinner and more flexible than the outer sealing rubber belt, so that it can be more firmly attached to the inside of the pipeline and is not easy to produce wrinkles or gaps.

[0011] Furthermore, the width of the inner and outer sealing tapes is determined according to the actual conditions of the construction, and should be sufficient to cover the hole or leak, and a distance of 10-15 cm should be reserved on both sides of the outer sealing tape to facilitate the construction of reinforcement ties.

[0012] Furthermore, the side of the inner sealing rubber belt that is attached to the inside of the pipe is a smooth surface, and the side that contacts the airbag is provided with anti-skid patterns. The two sides of the inner sealing rubber belt are designed differently. The side attached to the inner wall of the pipe is a smooth surface, which is convenient for demoulding after the epoxy resin is cured; and the side in contact with the airbag surface has anti-skid patterns, which can resist water pressure and prevent the inner sealing rubber belt and the airbag from relative displacement, ensuring that the inner sealing rubber belt is more firmly attached to the inner wall of the pipe under the expansion of the airbag, and plays a better role in the internal manufacturing and sealing.

[0013] In the present invention, the surface structure design of the inner sealing rubber belt with one side smooth and the other side rough mainly plays two roles: first, the inner sealing rubber belt acts as a cushion between the inner wall of the pipe and the airbag. If the inner sealing rubber belt is not provided and the airbag is directly used to seal the inside of the pipe, the smooth surface of the airbag will be displaced from the pipe wall due to the water pressure, which may cause the filler to be damaged or form a rough surface; second, the damaged filler is filled between the inner sealing rubber belt and the sealing rubber belt, and contacts with the smooth surface of the inner sealing rubber belt, which is convenient for demolding. If the airbag is directly used for sealing, it is not conducive to demolding, and it is easy to cause contamination or damage of the airbag, increasing unnecessary construction costs.

[0014] Furthermore, both sides of the external sealing rubber band have serrated patterns, so that the external sealing rubber band bites the first circle of rubber band when the second circle is wound, thereby preventing water from leaking through the gap, and at the same time increasing the fitting friction between the first circle and the second circle, thereby preventing the rubber band from slipping and loosening to form a gap and cause water leakage. In addition, the surface of the external sealing rubber band with serrated patterns contacts the damaged filler, which can increase the contact area and improve the integrity and firmness of the sealing structure.

[0015] Furthermore, the total number of windings of the external sealing rubber band is 2-4, preferably 2.5, and when winding, the serrated pattern on the inner side of the outer ring corresponds to the serrated pattern on the outer side of the inner ring.

[0016] Preferably, the injection operation of the damaged filler is performed before the external sealing rubber tape is wrapped around the second circle, and the temporary fixation of the external sealing tape can be performed by tying or the like.

[0017] Preferably, the wound end of the external sealing rubber band can be softened by heat treatment and then attached to the rubber band at the bottom; in addition, a liquid adhesive can be used to bond the end of the external sealing rubber band. In some repair construction processes, there may be a situation where the water pressure in the pipeline is relatively high. By fixing the end of the external sealing rubber band in time, the adverse effect of water flow on the repair construction can be prevented.

[0018] Furthermore, the reinforcement tie is made of stainless steel and has a width of 1-5 cm. During the construction process, the length of the reinforcement tie can be freely adjusted to reinforce the sealing rubber belt so that it is more tightly connected to the old pipe network. The reinforcement tie made of stainless steel not only has a certain compressive strength to prevent water from flowing out from the side of the external sealing tape, but also because the pipeline is buried in the soil and is in direct contact with the soil layer, the reinforcement tie made of stainless steel also has good corrosion resistance and durability.

[0019] Furthermore, the damaged filler adopts silica epoxy resin. In the present invention, after comprehensively comparing the performance and price of epoxy resins with various fillers, silica epoxy resin is selected as the damaged filler, which can not only reduce the construction cost, but also has good physical properties. Silica epoxy resin uses silica as the filler of epoxy resin. The addition of silica filler can fill the gaps in the resin system, prevent shrinkage, increase the filling degree of epoxy resin, improve the hardness, strength and toughness of the resin, and enhance its mechanical properties. In addition, the addition of silica can also improve chemical stability. The surface of silica can adsorb impurities such as oxidants and moisture to prevent the resin from decomposing and deteriorating. At the same time, these adsorbed impurities can also play the effect of filling the gaps in the resin.

[0020] Preferably, the epoxy resin uses a material with a medium or high epoxy value, such as E-44 (WSR6101) epoxy resin, which is a bisphenol A type epoxy resin with an epoxy value (eq / 100g): 0.41-0.47. It usually takes 1 hour for initial curing and 24 hours for complete curing at room temperature.

[0021] Furthermore, the content of filler also has an important influence on the mechanical properties of epoxy resin. Preferably, the amount of silica filler added to the epoxy resin is 20 wt.%-30 wt.%, more preferably 25 wt.%.

[0022] Furthermore, the damaged filler is injected and filled after the external plugging tape is pre-wrapped and temporarily fixed. Preferably, within the operation time after the silica epoxy resin material is mixed, a syringe-like tool with a smaller injection caliber can be used to directly make a hole in the external plugging tape for injection, and the injection pressure is used to ensure that the filler fills the cavity and the syringe is not pulled out. The reaction of epoxy resin and curing agent is divided into three stages: melting stage-gel stage-hardening stage. After the gel time, a viscous colloid that is not easy to flow and has a certain adhesive force is formed, and the syringe can be pulled out. Due to the elasticity of the external plugging tape itself and the viscosity of the colloid, the damaged filler in a gel state will not flow out from the injection port.

[0023] Furthermore, after the damaged filling material is basically solidified, the materials used for temporary fixation are removed, and then the external sealing tape is subsequently wrapped. The external sealing tape of the outer circle is used to cover the external sealing tape with the injection port of the inner circle, so as to further improve the overall strength and ensure the quality of maintenance.

[0024] The above construction method is mainly suitable for repairing local cracks, small gaps, through cracks and holes in the leakage parts of old rainwater and sewage pipes in municipal engineering. It is also suitable for the situation where one end of the pipe falls off and the other end has cracks due to uneven settlement of pipes on both sides at the interface and needs to be repaired. This construction method has the advantages of in-situ repair, maintaining flexible connection of pipes, small scope of road damage and high construction efficiency.

[0025] Furthermore, in some complex pipeline leakage situations, the leakage site is the drainage interface, and due to the serious settlement of the pipeline, both ends of the pipeline fall off and cannot be reinstalled. In this case, a new pipeline is first used to replace the original pipeline that has fallen off, and then the method of steps S2-S5 is used to connect and seal the drainage interface.

[0026] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a construction method for sealing leakage in old rainwater and sewage pipe networks of municipal engineering projects. It is a method for in-situ repair of leaking old pipes. The method uses a sealing rubber belt, a reinforcing tie, an air bag and a damaged filler to solve the problems of complex device structure and difficult operation in the conventional pipeline leakage repair process, thereby achieving the effects of quick installation, economic benefits, improved construction efficiency and reduced costs.

[0027] (2) The present invention provides a construction method for sealing leakage in old rainwater and sewage pipe networks of municipal engineering projects. The internal sealing rubber belt and the external sealing rubber belt used are both made of flexible materials, which solves the problem of disconnection and water seepage of the interface caused by uneven settlement on both sides of the pipe. While dealing with the water seepage, it also ensures the flexible connection of the pipe. In addition, the present invention uses damaged fillers to fill the missing and broken parts of the pipe, which solves the problem of the prior art that the wall thickness of the pipe is reduced after the pipe is repaired, which is prone to secondary damage, and achieves the effect of extending the service life of the pipe after repair and having good hardness and weather resistance.

[0028] (3) The present invention provides a construction method for sealing leakage in old rainwater and sewage pipe networks in municipal engineering. The internal sealing rubber belt, external sealing rubber belt, reinforcement tie and damaged filler used in the invention all have a structural design with flexible and variable sizes, which can form a good matching effect with drainage pipes of various diameters in municipal engineering at this stage, solve the problem of poor adaptability of existing conventional repair schemes, and have a strong prospect for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the operation of forming an inner lining on the inner wall of a leaking pipe using an air bag and an inner sealing rubber belt according to Embodiment 1 of the present invention; Figure 2 A schematic diagram of the structure of an external sealing rubber band provided in Example 1 of the present invention; Figure 3 A schematic diagram of the structure of a reinforcement tie provided in Example 1 of the present invention; Figure 4 A partially enlarged structural schematic diagram of the damaged pipe plugging effect provided by Example 2 of the present invention; Figure 5 A schematic diagram of the pipeline leakage blocking effect provided by Example 2 of the present invention; Figure 6 A schematic diagram of the pipe interface blocking effect provided by Example 3 of the present invention; Among them, 1-airbag; 2-traction rope; 3-internal sealing tape; 4-damaged part of the pipeline; 5-external sealing tape; 6-reinforcement tie; 7-damaged filling material; 8-new replacement pipeline. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited thereto.

[0033] Example 1 This embodiment provides a construction method for plugging leakage in old rainwater and sewage pipe networks of municipal projects. The main devices and materials involved in the construction method are as follows: The airbag is a pipeline airbag made of high-quality rubber. The inner sealing rubber belt is sent to the corresponding position of the leakage part inside the pipeline by the airbag. The airbag is expanded by inflation. When the gas pressure in the pipeline airbag reaches the specified requirement, the pipeline airbag fills the entire pipeline section. On the one hand, it can quickly block the water flow. On the other hand, the pressure provided by the airbag makes the inner sealing rubber belt fit tightly to the leakage part inside the pipeline to form an inner lining (operation diagram as shown in the figure below). Figure 1 As shown), it helps the subsequent damaged filling to quickly reshape and prevent leakage.

[0034] The sealing tape is made of soft rubber and comprises an inner sealing rubber tape with a thickness of 5 mm and an outer sealing rubber tape with a thickness of 10 mm.

[0035] The internal sealing rubber belt adopts a double-sided structural design with different sides. The side that fits the inside of the pipe is a smooth surface, which is convenient for demolding the damaged filler after solidification. The side in contact with the airbag is provided with anti-slip texture, which can resist water pressure and prevent relative displacement between the internal sealing rubber belt and the airbag, ensuring that the internal sealing rubber belt fits more firmly to the inner wall of the pipe under the expansion of the airbag, and plays a better manufacturing and sealing role inside.

[0036] The external sealing rubber band has serrated patterns on both sides. The schematic diagram of its structure is as follows: Figure 2 As shown in the figure, this double-sided pattern design enables the external sealing rubber belt to bite the first circle of rubber belt when the second circle is wound, thereby preventing water from leaking through the gap, and at the same time increasing the fitting friction between the first circle and the second circle, thereby preventing the rubber belt from slipping and loosening to form a gap and cause water leakage. In addition, the surface of the external sealing rubber belt with a serrated pattern contacts the damaged filler, which can increase the contact area and improve the integrity and firmness of the sealing structure.

[0037] The structural diagram of the reinforcement tie is as follows: Figure 3 As shown, it is made of soft steel and can be freely adjusted in length. When in use, it is wound in the opposite direction of the sealing rubber belt 1 to reinforce the sealing rubber belt so that it is more tightly connected to the old pipe network.

[0038] In the embodiment of the present invention, the damaged filler adopts silica epoxy resin (E-44 (WSR6101) epoxy resin, epoxy value (eq / 100g): 0.41-0.47, usually 1 hour for initial curing and 24 hours for complete curing at room temperature, and the doping amount of silica is 25 wt.%). After curing, it has high hardness and good weather resistance, and can be filled in the missing and damaged parts of the pipeline wall, reducing the probability of secondary leakage of the pipeline and extending the service life of the repaired pipeline.

[0039] The construction method comprises the following steps: Step 1: Confirm the leakage location and burial depth of the drainage pipe, fully expose the leakage location of the drainage pipe, and dig out an operating space under the leakage location; Step 2: Use the airbag to send the inner sealing rubber belt to the corresponding position of the leakage part inside the pipeline, use the expansion of the airbag to fill the entire pipeline section and fit the inner sealing rubber belt inside the pipeline; Step 3: Use the external sealing rubber band to pre-wrap and temporarily fix the corresponding position of the external leakage part of the pipeline, and inject the damaged filler into the empty space between the internal sealing rubber band and the external sealing rubber band and fill it; Step 4: After the damaged filler is solidified, further wrap the external sealing rubber band, fix the end of the wrapping, and use a reinforcing tie to wrap it around the outside in the opposite direction of the wrapping of the external sealing rubber band to reinforce the external sealing rubber band; Step 5: Pull out the airbag and the inner sealing rubber belt from the inside of the pipeline, retain the outer sealing rubber belt and the reinforcing rolled belt, and backfill the pipeline to complete the sealing construction of pipeline leakage.

[0040] Example 2 This embodiment provides a construction method for sealing leakage in old rainwater and sewage pipe networks of municipal engineering projects. The construction method is suitable for leakage locations such as local cracks, small gaps, through cracks or voids, and interface locations (situations where one end of the pipe falls off and cracks appear at the interface at the other end due to uneven settlement of the pipes on both sides). The devices and materials used in the construction method are the same as those in Example 1.

[0041] Specifically, the construction method for repairing the leaking part or the interface part includes the following steps: Step 1: Confirm the leakage location and burial depth according to the pipe network layout, the current surface conditions of the pipeline range, and the internal inspection of the pipeline; dig out the soil around the leakage location to fully expose the leakage location of the drainage pipe, and dig out a certain operating surface under the pipeline at the leakage location; Step 2: Use an airbag to deliver the 5mm thick inner sealing rubber belt into the corresponding position inside the pipeline, and inflate the airbag by inflation. When the gas pressure in the pipeline airbag reaches the specified requirement, the pipeline airbag fills the entire pipeline section and fits the 5mm thick inner sealing rubber belt inside the pipeline; Step 3: Use a 10mm thick external sealing rubber band to pre-wrap the corresponding position of the external leakage part of the pipeline for 1.5 turns, and use a bandage to temporarily fix it; fill the silica epoxy resin as a damaged filler into the syringe, use the syringe needle to pass the damaged filler through the external sealing rubber band, inject it into the leaking damaged part and fill it; after the silica epoxy resin has a certain gel time and forms a viscous colloid that is not easy to flow and has a certain adhesive force, pull out the syringe; Step 4: After the damaged filler is basically solidified, remove the temporary fixing bandage, and further wrap the external sealing rubber belt for one circle. During the wrapping process, the serrated patterns are aligned to make the surfaces of the inner and outer circles of the external sealing rubber belt fit together. The winding end is bonded to the rubber belt at the bottom by heat treatment or glue. Then, a set of stainless steel reinforcement ties with a width of 2 cm are used to wrap around the outside of the external sealing rubber belt in the opposite winding direction. The reinforcement ties are symmetrically distributed on both sides of the external sealing rubber belt to make the external sealing rubber belt more tightly connected to the old pipe network. Step 5: After the broken filler silica epoxy resin is completely cured, the airbag and the smooth inner sealing rubber belt are pulled out, the outer sealing rubber belt and the reinforcing rolled belt are retained, and the pipe section is backfilled. The pipeline can then be used normally. Figure 4 The schematic diagram of the overall effect of pipeline leakage plugging is shown in Figure 5 shown.

[0042] Example 3 This embodiment provides a construction method for plugging leakage of old rainwater and sewage pipe networks in municipal engineering projects. The difference from Embodiment 2 is that the leakage part of the pipe in this embodiment is the interface part, and due to the serious settlement of the pipe, both ends of the pipe fall off and cannot be reinstalled. In this case, the construction method for repairing the interface part includes the following steps: First, a common pipe of suitable size (no need to specially customize pipes of corresponding models and sizes) is used to replace the original pipes that have fallen off at both ends. Then, the interface between the replaced new pipe and the original pipes on both sides is connected and reinforced using the method of steps 2-5 in Example 2. The schematic diagram of the pipe interface plugging effect is shown in FIG. Figure 6 shown.

[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for plugging leakage in old rainwater and sewage pipe networks of municipal projects. It is characterized in that The following steps are involved: S1. Confirm the leakage location and burial depth of the drainage pipe, fully expose the leakage location of the drainage pipe, and dig out an operating space under the leakage location; S2. Use the airbag to send the inner sealing rubber belt to the corresponding position of the leakage part inside the pipeline, use the expansion of the airbag to fill the entire pipeline section and stick the inner sealing rubber belt to the inside of the pipeline; S3. Use an external sealing rubber band to pre-wrap and temporarily fix the corresponding position of the external leakage part of the pipeline, and inject the damaged filler into the empty space between the internal sealing rubber band and the external sealing rubber band to fill it; S4. After the damaged filler is solidified, the external sealing rubber band is further wound, the winding end is fixed, and a reinforcing tie is used to wind the external sealing rubber band in the opposite winding direction to the external sealing rubber band to reinforce the external sealing rubber band; S5. Pull out the airbag and the inner sealing rubber belt from the inside of the pipeline, retain the outer sealing rubber belt and the reinforcing rolled belt, and backfill the pipeline to complete the sealing construction of pipeline leakage.

2. The construction method according to claim 1, It is characterized in that The inner sealing rubber band and the outer sealing rubber band are both made of soft rubber.

3. The construction method according to claim 2, It is characterized in that The soft rubber includes one or more of silicone rubber, chloroprene rubber, fluororubber, and EPDM rubber.

4. The construction method according to claim 1, It is characterized in that The thickness of the inner sealing rubber band is 4-6 mm, and the thickness of the outer sealing rubber band is 8-12 mm.

5. The construction method according to claim 1, It is characterized in that The side of the inner sealing rubber belt that is attached to the inside of the pipe is a smooth surface, and the side that contacts the airbag is provided with anti-slip patterns.

6. The construction method according to claim 1, It is characterized in that The surfaces of both sides of the external sealing rubber band are provided with serrated patterns.

7. The construction method according to claim 6, It is characterized in that The total number of windings of the external sealing rubber band is 2-4, and when winding, the serrated pattern on the inner side of the outer ring corresponds to the serrated pattern on the outer side of the inner ring.

8. The construction method according to claim 1, It is characterized in that The reinforcing tie is made of stainless steel and has a width of 1-5 cm.

9. The construction method according to claim 1, It is characterized in that The broken filler is made of silicon dioxide epoxy resin, and the amount of silicon dioxide filler added to the epoxy resin is 20 wt.%-30 wt.%.

10. The construction method according to claim 1, It is characterized in that When the leakage site is the drainage interface and both ends of the pipe are detached and cannot be reinstalled due to severe pipe settlement, first use a new pipe to replace the original pipe in the middle of the two sides of the pipe, and then use the method of steps S2-S5 to connect and seal the drainage interface.

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