A site-specific intravascular repair device

By designing a fixed-point in-pipe repair device with detachable ultraviolet light and grouting modules, the problem of frequent equipment replacement was solved, and multiple repair methods were integrated in a highly efficient and stable manner. This device is adaptable to different pipe specifications and improves construction efficiency and repair effect.

CN224567009UActive Publication Date: 2026-07-28XIAMEN CONSTRUCTION ENGINEERING CO LTD OF CHINA RAILWAY FIRST GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XIAMEN CONSTRUCTION ENGINEERING CO LTD OF CHINA RAILWAY FIRST GROUP
Filing Date
2025-06-30
Publication Date
2026-07-28

AI Technical Summary

Technical Problem

The existing fixed-point pipe repair device cannot perform both UV curing repair and lining repair with a single set of equipment, which requires construction personnel to frequently change equipment, reducing construction efficiency and significantly extending the construction period, especially in multi-point projects.

Method used

A fixed-point in-pipe repair device was designed, which includes a detachable ultraviolet light module and a grouting module. Combined with an air inflation mechanism and camera equipment, it enables the switching of repair methods with a single device, ensuring uniform contact of repair materials and providing real-time visual feedback. The walking wheels ensure stable movement of the device.

Benefits of technology

It improves construction efficiency, reduces equipment replacement time, ensures uniform curing and sealing of repair materials, reduces repeated repairs, adapts to different pipe specifications, significantly shortens the construction period, and reduces equipment purchase costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of spot pipe in-place repair device, including first walking device and second walking device arranged in front and back, first walking device and the second walking device are equipped with connecting pipe between, connecting pipe is equipped with inflation mechanism and control device, control device is electrically connected to first walking device and second walking device, connecting pipe outer side wall is detachably connected with ultraviolet light module for ultraviolet light curing method or grouting module for pad repair method, inflation mechanism can be used with ultraviolet light module and grouting module, realize only using a set of equipment and replacing connecting corresponding module can carry out ultraviolet light repair method or pad repair method, so that construction personnel need not in the operation between the equipment corresponding to two repair methods frequent disassembly and replacement, save the time consumed in the traditional way due to switching equipment, can make construction process more coherent and efficient, especially for including multiple repair points Large-scale engineering, can significantly shorten overall construction period.
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Description

Technical Field

[0001] This utility model relates to the field of pipeline repair technology, and in particular to a fixed-point in-pipe repair device. Background Technology

[0002] With the acceleration of urbanization and the increasing prominence of aging infrastructure, the demand for maintenance and repair of municipal pipeline systems is constantly increasing. Traditional open-cut repair methods are not only time-consuming and costly, but also significantly impact urban traffic and residents' lives. Therefore, trenchless repair technologies are gradually gaining market favor due to their unique advantages. Currently, the mainstream trenchless pipeline repair technologies mainly include ultraviolet light curing repair and gasket repair.

[0003] However, the existing fixed-point in-pipe repair device cannot use a single set of equipment for both UV curing repair and lining repair. The two repair methods require separate specialized equipment. After completing one repair method at a repair point, the construction personnel need to dismantle the entire set of equipment and replace it with the equipment required for the other method. This process is time-consuming and greatly reduces the overall construction efficiency. In particular, for projects with multiple repair points, frequent equipment switching will lead to a significant extension of the construction period. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a fixed-point in-pipe repair device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A fixed-point in-pipe repair device is characterized by comprising a first walking device and a second walking device arranged front to back, a connecting pipe between the first walking device and the second walking device, an inflation mechanism and a control device being provided inside the connecting pipe, the control device being electrically connected to the first walking device and the second walking device, and an ultraviolet light module for ultraviolet curing or a grouting module for padding repair being detachably connected to the outer wall of the connecting pipe, the inflation mechanism being usable in conjunction with the ultraviolet light module and the grouting module.

[0007] Furthermore, the inflation mechanism includes a membrane sleeved on the outside of the connecting tube and an air pipe disposed on the inside of the connecting tube. The air pipe is used to inflate and deflate the membrane to make it expand and contract. When the membrane expands, the membrane abuts against the tube wall.

[0008] Furthermore, the ultraviolet light module includes several ultraviolet light tubes located outside the connecting tube and connected at both ends to the first walking device and the second walking device, as well as a repair tube sleeved on the outside of the membrane, the repair tube expanding with the membrane.

[0009] Furthermore, the grouting module includes a liner sleeved on the membrane and a grouting mechanism passing through the membrane and the liner, and the grouting mechanism is sealed to the membrane.

[0010] Furthermore, the grouting mechanism includes a grouting pipe disposed within the connecting pipe and a plurality of grouting hoses passing through the connecting pipe, wherein the grouting hoses are connected to the grouting pipe, and a one-way valve is connected to the outlet of the grouting hoses.

[0011] Furthermore, the outlet of the grouting hose is also threaded with a sealing element, and the sealing element is connected to the membrane.

[0012] Furthermore, the surface of the liner tube is provided with a number of support protrusions that can be used to support the gap between the liner tube and the tube wall.

[0013] Furthermore, the outer wall of the first walking device and / or the second walking device is provided with a camera device capable of capturing images of the area to be repaired, and the camera device is electrically connected to the control device.

[0014] Furthermore, the outer walls of the first and second walking devices are provided with a plurality of walking wheels. The walking wheels are connected to a rotating mechanism, which includes a motor. The output end of the motor is connected to a swinging member and a telescopic member. The swinging member and the telescopic member are rotatably connected to the outer walls of the first and second walking devices. During the movement, the swinging member can drive the walking wheels to move back and forth, and the telescopic member can drive the walking wheels to move up and down during the extension and retraction process.

[0015] Furthermore, the outer wall of the walking wheel has several wheel protrusions distributed along its circumference.

[0016] The beneficial effects of this utility model are:

[0017] 1. The present invention proposes a fixed-point pipe repair device, wherein the connecting pipe is detachably connected to an ultraviolet light module or a grouting module, which realizes that only one set of equipment is needed and the corresponding module is replaced to carry out ultraviolet light repair or padding repair. This eliminates the need for construction personnel to frequently disassemble and replace the equipment corresponding to the two repair methods during operation, saving a lot of time spent on equipment switching in the traditional method. It makes the construction process more continuous and efficient, especially for large projects with multiple repair points, which can significantly shorten the overall construction period.

[0018] 2. The present invention proposes a fixed-point pipe repair device, wherein the ultraviolet light module includes several ultraviolet light tubes located outside the connecting pipe and connected at both ends to the first walking device and the second walking device. The ultraviolet light tubes are distributed around the connecting pipe, which helps to ensure that the material on the inner wall of the pipe being repaired can receive ultraviolet light irradiation evenly, enhance the material curing effect, and improve the material repair efficiency.

[0019] 3. The present invention proposes a fixed-point pipe repair device, wherein the grouting module includes a liner sleeved on the outside of the membrane and a grouting mechanism passing through the membrane and the liner. The grouting mechanism is sealed to the membrane, providing a stable environment for the membrane to inflate.

[0020] 4. The present invention proposes a fixed-point pipe repair device, wherein the grouting mechanism includes a grouting pipe disposed in the connecting pipe and a plurality of grouting hoses passing through the connecting pipe. The plurality of grouting hoses are arranged along the outer side wall of the connecting pipe, which can ensure that the grouting material is evenly distributed inside the pipe. Moreover, this layout can expand the grouting coverage area and provide grouting material to different areas of the pipe.

[0021] 5. The present invention proposes a fixed-point pipe repair device, wherein the outlet of the grouting hose is threadedly connected with a sealing element, which is sealed to the membrane. The sealing element can effectively prevent the grout from leaking during the connection or waiting process, ensuring the smooth progress of the preparation work before grouting. In addition, the outlet of the grouting hose is connected with a one-way valve, which can effectively prevent the grouting material from flowing back into the grouting hose after grouting is completed.

[0022] 6. The present invention proposes a fixed-point pipe repair device, wherein a membrane that can shrink or expand under the action of an inflation mechanism is sleeved on the outside of the connecting pipe. When performing ultraviolet light repair and gasket repair, the repair device needs to inflate the membrane to make the repair material to be used fit the pipe to be repaired. In the ultraviolet light repair method, this helps to improve the curing effect of the light-curing material and enhance the strength and sealing of the repair layer. In the gasket repair method, it can ensure that the gasket material is in full contact with the inner wall of the pipe, forming a good sealing and support effect.

[0023] 7. The present invention proposes a fixed-point pipe repair device, wherein the outer wall of the first traveling device and / or the second traveling device is equipped with a camera device capable of acquiring images of the area to be repaired. The camera device is electrically connected to the control device. The camera device can acquire images of the area to be repaired inside the pipe in real time. Construction personnel can view these images through the control device and clearly understand the location, extent, and degree of damage inside the pipe, thereby more accurately positioning the repair module to the part that needs repair, avoiding repair failure or repeated repair due to inaccurate positioning. In addition, the camera device can also provide real-time visual feedback when using different repair methods. Combined with multiple repair modules, it can realize the integrated application of multiple repair methods, improving the overall performance and practicality of the repair device.

[0024] 8. The present invention proposes a fixed-point pipe repair device, wherein the outer walls of the first and second traveling devices are provided with several traveling wheels. The traveling wheels enable the repair device to move stably and accurately to the position to be repaired in the pipe, reducing the time and effort of manually adjusting the position of the device and improving the efficiency of the repair operation; and the traveling device is connected to a telescopic component, so that the repair device can adapt to pipes of various specifications. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an overall schematic diagram of a fixed-point in-pipe repair device according to the present invention;

[0027] Figure 2 This is one of the schematic diagrams of the first or second traveling device of the fixed-point in-pipe repair device of this utility model;

[0028] Figure 3 This is a second schematic diagram of the first or second traveling device of a fixed-point in-tube repair device according to the present invention.

[0029] Figure 4 This is a schematic diagram of a first embodiment of a fixed-point in-tube repair device according to the present invention;

[0030] Figure 5 This is one of the schematic diagrams of the ultraviolet light module of a fixed-point in-tube repair device according to this utility model;

[0031] Figure 6 This is a second schematic diagram of the ultraviolet light module of a fixed-point in-tube repair device according to this utility model;

[0032] Figure 7 This is a schematic diagram of a second embodiment of a fixed-point in-tube repair device according to the present invention;

[0033] Figure 8 This is one of the schematic diagrams of a grouting module for a fixed-point pipe repair device according to this utility model;

[0034] Figure 9 This is the second schematic diagram of the grouting module of a fixed-point pipe repair device according to this utility model.

[0035] In the diagram, 101 is the first walking device; 102 is the second walking device; 20 is the connecting pipe; 30 is the ultraviolet light module; 301 is the ultraviolet light tube; 40 is the grouting module; 401 is the lining pipe; 402 is the grouting hose; 403 is the one-way valve; 404 is the sealing element; 405 is the support element; 50 is the inflation mechanism; 501 is the membrane body; 60 is the camera equipment; 701 is the walking wheel; 7011 is the wheel protrusion; 702 is the swinging element; and 703 is the telescopic element. Detailed Implementation

[0036] The following is combined with Figures 1 to 6 The first embodiment of this utility model will be described in detail.

[0037] Example 1

[0038] A fixed-point in-pipe repair device includes a first traveling device 101 and a second traveling device 102 arranged front and rear, with a connecting pipe 20 between them. The connecting pipe 20 contains an inflation mechanism 50 and a control device (not shown in the figure). The control device is electrically connected to both the first traveling device 101 and the second traveling device 102. An ultraviolet light module 30 for ultraviolet curing or a grouting module 40 for padding repair is detachably connected to the outer wall of the connecting pipe 20. The inflation mechanism 50 can be used in conjunction with the ultraviolet light module 30 and the grouting module 40. This device allows for both ultraviolet light repair and padding repair using only one set of equipment and by changing the corresponding modules. This eliminates the need for frequent disassembly and replacement of equipment between the two repair methods, saving the significant time wasted on equipment switching in traditional methods. This makes the construction process more continuous and efficient, especially for large projects with multiple repair points, significantly shortening the overall construction period.

[0039] In this embodiment, the first walking device 101, the connecting pipe 20, and the second walking device 102 divide the repair device into three parts: front, middle, and rear. All three parts can be disassembled. The detachable structure can easily cope with many restrictions during transportation and transfer, saving time and effort and greatly improving construction efficiency. Moreover, in different pipeline repair scenarios, the device can be freely combined as needed to easily adapt to various complex working conditions. There is no need to purchase multiple sets of complete devices of different specifications, which reduces equipment purchase costs and management difficulty.

[0040] Preferably, the first walking device 101, the second walking device 102 and the connecting pipe 20 are made of metal.

[0041] In this embodiment, the connecting pipe 20 is also provided with a data transmission unit, which can be electrically connected to the equipment provided on the first walking device 101 and the second walking device 102 to realize control and data transmission.

[0042] In this embodiment, the inflation mechanism 50 includes a membrane 501 sleeved on the outside of the connecting pipe 20 and an air pipe (not shown in the figure) disposed on the inside of the connecting pipe 20. The air pipe is used to inflate and deflate the membrane 501 to make it expand and contract. When the membrane 501 expands, the membrane 501 abuts against the pipe wall.

[0043] Furthermore, when performing ultraviolet light repair and gasket repair, the repair device needs to inflate the membrane 501 to allow the required repair material to adhere to the pipe to be repaired. In the ultraviolet light repair method, this helps to improve the curing effect of the light-curing material and enhance the strength and sealing of the repair layer. In the gasket repair method, it ensures that the gasket material is in full contact with the inner wall of the pipe, forming a good sealing and support effect.

[0044] Preferably, the membrane 501 is a polyurethane film, and the membrane 501 is a transparent membrane 501, which makes it easy for construction personnel to check the condition of the repair device.

[0045] In this embodiment, the ultraviolet light working module includes several ultraviolet lamp tubes 301 located outside the connecting tube 20 and connected at both ends to the first walking device 101 and the second walking device 102, as well as a repair tube (not shown in the figure) sleeved outside the membrane 501. The repair tube expands with the membrane 501.

[0046] Furthermore, the ultraviolet lamp tubes 301 are distributed around the connecting tube 20, which helps to ensure that the material on the inner wall of the pipe being repaired can receive ultraviolet light evenly, enhance the curing effect of the material, and improve the repair efficiency of the material.

[0047] Specifically, the repair tube is a UV-curable flexible tube.

[0048] In this embodiment, the outer wall of the first walking device 101 and / or the second walking device 102 is provided with a camera device 60 capable of acquiring images of the area to be repaired. The camera device 60 is electrically connected to the control device. The camera device 60 can acquire images of the area to be repaired inside the pipeline in real time. Construction personnel can view these images through the control device and clearly understand the location, extent, and degree of damage inside the pipeline. This allows for more accurate positioning of the repair module to the part that needs repair, avoiding repair failure or repeated repairs due to inaccurate positioning. Furthermore, the camera device 60 can provide real-time visual feedback when using different repair methods. Combined with multiple repair modules, it enables the integrated application of multiple repair methods, improving the overall performance and practicality of the repair device.

[0049] Preferably, the camera device 60 is made of plastic.

[0050] In this embodiment, the outer walls of the first walking device 101 and the second walking device 102 are provided with a plurality of walking wheels 701. The walking wheels 701 are connected to a rotating mechanism, which includes a motor. The output end of the motor is connected to a swing member 702 and a telescopic member 703. The swing member 702 and the telescopic member 703 are rotatably connected to the outer walls of the first walking device 101 and the second walking device 102. During the movement, the swing member 702 can drive the walking wheels 701 to move back and forth, and during the extension and retraction of the telescopic member 703, the walking wheels 701 can move up and down.

[0051] Furthermore, the traveling wheels 701 enable the repair device to move stably and accurately to the position to be repaired within the pipeline, reducing the time and effort required for manual adjustment of the device position and improving the efficiency of the repair operation; and the traveling device is connected to the telescopic component 703, which allows the repair device to adapt to pipelines of various specifications.

[0052] Specifically, the swing member 702 is rotatably connected to the first fixed member, and the telescopic member 703 is rotatably connected to the second fixed member. The first fixed member and the second fixed member are located on the outer side walls of the first walking device 101 and the second walking device 102.

[0053] In this embodiment, the rotating mechanism also includes a hub and a rotating housing, and a motor is installed inside the rotating housing.

[0054] Preferably, the walking wheel 701 is made of rubber material, and the telescopic component 703, wheel hub and rotating housing are made of metal material.

[0055] In this embodiment, the outer wall of the walking wheel 701 has several wheel protrusions 7011 distributed around its circumference. The wheel protrusions 7011 increase the contact area and friction between the walking wheel 701 and the inner wall of the pipe, preventing the repair device from slipping when moving inside the pipe.

[0056] In this embodiment, the outer walls of the first walking device 101 and the second walking device 102 are each provided with three walking wheels 701, and the included angle between the axes of the three walking wheels 701 is 120 degrees. This layout ensures that the repair device is evenly stressed on the inner wall of the pipe, avoiding problems such as device tilting, shaking, or excessive local pressure caused by uneven stress, thereby improving the stability of the device in the pipe and facilitating the smooth progress of the repair operation. Furthermore, because the walking wheels 701 are evenly distributed, the ultraviolet light module 30 can maintain a centered position during operation, reducing problems such as poor contact between the repair module and the inner wall of the pipe or uneven distribution of repair material caused by device tilting or offset, thereby improving the consistency and reliability of the repair effect.

[0057] In this embodiment, the operating principle of the first traveling device 101 and the second traveling device 102 is as follows: The motor is installed inside the rotating housing, and the motor output end is connected to a swinging component 702 and a telescopic component 703. The swinging component 702 can drive the traveling wheel 701 to move back and forth, and the telescopic component 703 can be adjusted according to the inner diameter of the pipe to be repaired, driving the traveling wheel 701 to move up and down, ensuring that the traveling wheel 701 is tightly attached to the inner wall of the pipe. During the repair operation, the control device controls the motor to start working, and the first traveling device 101 and the second traveling device 102 accurately position the entire repair device to the part of the pipe that needs to be repaired according to the repair position determined by the camera device 60. After positioning, the control device controls the motor to stop working.

[0058] In this embodiment, the method of using the fixed-point in-tube repair device includes the following steps:

[0059] S1. Assembly device: Connect the first end of the membrane 501 to the first walking device 101, then pass the connecting tube 20 through the first walking device 101, then connect the ultraviolet light module 30 to the connecting tube 20, and finally connect the second end of the membrane 501 and the connecting tube 20 to the second walking device 102 to complete the assembly.

[0060] S2. Determine the location: Control the fixed-point in-pipe repair device to move inside the pipeline through the control device, and determine the location to be repaired through the camera equipment 60;

[0061] S3. Pipeline repair: The air tube is operated by the control device to inflate the membrane 501, causing the membrane 501 to expand and drive the repair tube to fit tightly against the pipe wall to be repaired. Then, the ultraviolet lamp tube 301 is turned on to carry out the curing operation. After curing, the air inflation mechanism 50 is operated by the control device to release the air. Finally, the repair effect is checked by the camera equipment 60.

[0062] Example 2

[0063] Unlike Embodiment 1, in this embodiment, as... Figures 7 to 9As shown, the connecting pipe 20 is detachably connected to the grouting module 40. The grouting module 40 includes a liner tube 401 sleeved on the membrane 501 and a grouting mechanism passing through the membrane 501 and the liner tube 401. The grouting mechanism is sealed to the membrane 501, providing a stable environment for the inflation and expansion of the membrane 501.

[0064] Furthermore, the grouting mechanism includes a grouting pipe (not shown in the figure) located inside the connecting pipe 20 and several grouting hoses 402 passing through the connecting pipe 20. The multiple grouting hoses 402 are arranged along the outer wall of the connecting pipe 20, which can ensure that the grouting material is evenly distributed inside the pipe. This layout can expand the grouting coverage area and provide grouting material to different areas of the pipe. The grouting hoses 402 are connected to the grouting pipe.

[0065] Specifically, the outlet of the grouting hose 402 is connected to a one-way valve 403. The one-way valve 403 can effectively prevent the grouting material from flowing back into the grouting hose 402 after grouting is completed.

[0066] Preferably, the grouting hose 402 is made of rubber and the one-way valve 403 is made of metal.

[0067] In this embodiment, the outlet of the grouting hose 402 is also threaded with a sealing element 404, and the sealing element 404 is connected to the membrane 501. The sealing element 404 can effectively prevent the grout from leaking during the connection or waiting process, ensuring that the preparation work before grouting is carried out smoothly.

[0068] Preferably, the seal 404 is made of plastic.

[0069] In this embodiment, the surface of the liner tube 401 is provided with a plurality of support protrusions (not shown in the figure) that can be used to support the gap between the liner tube 401 and the tube wall.

[0070] Furthermore, the liner tube 401 is provided with limiting protrusions at both ends (not shown in the figure), which can prevent grout from leaking out when the device is grouting repaired.

[0071] In this embodiment, a support member 405 is also included. The first end of the support member 405 is connected to the connecting pipe 20, and the second end is connected to the grouting hose 402.

[0072] In this embodiment, the method of using the fixed-point in-tube repair device includes the following steps:

[0073] S1. Assembly device: Connect the first end of the membrane 501 to the first walking device 101, then pass the connecting pipe 20 through the first walking device 101, then connect the grouting module 40 to the connecting pipe 20, and finally connect the second end of the membrane 501 and the connecting pipe 20 to the second new trench assembly device to complete the assembly.

[0074] S2. Determine the location: Control the fixed-point in-pipe repair device to move inside the pipeline through the control device, and determine the location to be repaired through the camera equipment 60;

[0075] S3. Pipeline Repair: The air pipe is operated by the control device to inflate the membrane 501, causing the membrane 501 to expand and drive the liner 401 to fit tightly against the pipe wall to be repaired. Then, the grouting material is introduced into the grouting pipe through the grouting hose 402 and the one-way valve 403. After the grouting material has solidified, the air inflation mechanism 50 is operated by the control device to deflate the air. Finally, the repair effect is checked by the camera equipment 60.

[0076] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A site-specific in-dwelling repair device, characterized by, The device includes a first walking device and a second walking device arranged in front and behind each other. A connecting pipe is provided between the first walking device and the second walking device. An inflation mechanism and a control device are provided inside the connecting pipe. The control device is electrically connected to the first walking device and the second walking device. An ultraviolet light module for ultraviolet curing or a grouting module for padding repair is detachably connected to the outer wall of the connecting pipe. The inflation mechanism can be used in conjunction with the ultraviolet light module and the grouting module.

2. A site tube repair device as claimed in claim 1, wherein, The inflation mechanism includes a membrane sleeved on the outside of the connecting tube and an air pipe disposed on the inside of the connecting tube. The air pipe is used to inflate and deflate the membrane to make it expand and contract. When the membrane expands, it abuts against the tube wall.

3. A site pipe repair device as claimed in claim 2, wherein, The ultraviolet light module includes several ultraviolet light tubes located outside the connecting tube and connected at both ends to the first walking device and the second walking device, as well as a repair tube sleeved on the outside of the membrane. The repair tube expands with the membrane.

4. The fixed-point in-pipe repair device as described in claim 2, characterized in that, The grouting module includes a liner sleeved on the membrane and a grouting mechanism passing through the membrane and the liner, and the grouting mechanism is sealed to the membrane.

5. The fixed-point in-pipe repair device as described in claim 4, characterized in that, The grouting mechanism includes a grouting pipe disposed in the connecting pipe and a plurality of grouting hoses passing through the connecting pipe, wherein the grouting hoses are connected to the grouting pipe and the outlet of the grouting hoses is connected to a one-way valve.

6. The fixed-point in-pipe repair device as described in claim 5, characterized in that, The outlet of the grouting hose is also threaded with a seal, and the seal is connected to the membrane.

7. The fixed-point in-pipe repair device as described in claim 4, characterized in that, The surface of the liner tube is provided with several support protrusions that can be used to support the gap between the liner tube and the tube wall.

8. The fixed-point in-pipe repair device as described in claim 1, characterized in that, The outer wall of the first walking device and / or the second walking device is provided with a camera device capable of capturing images of the area to be repaired, and the camera device is electrically connected to the control device.

9. The fixed-point in-pipe repair device as described in claim 1, characterized in that, The first walking device and the second walking device are provided with a plurality of walking wheels on their outer side walls. The walking wheels are connected to a rotating mechanism. The rotating mechanism includes a motor. The output end of the motor is connected to a swinging member and a telescopic member. The swinging member and the telescopic member are rotatably connected to the outer side walls of the first walking device and the second walking device. During the movement, the swinging member can drive the walking wheels to move back and forth. During the extension and retraction of the telescopic member, the walking wheels can move up and down.

10. The fixed-point in-pipe repair device as described in claim 9, characterized in that, The outer wall of the walking wheel has several wheel protrusions distributed along its circumference.