Repairing device for environment-friendly drainage pipeline

Abstract

The invention relates to the field of repair of drainage pipelines, in particular to a repair device for an environment-friendly drainage pipeline, which comprises a repair buoy and a curing buoy which are connected with each other, and repair air bags and curing air bags are distributed on the surfaces of the repair buoy and the curing buoy. Repairing and curing operation can be completed in the pipeline, isolation of the repairing space is achieved through the air bag, on one hand, the workload of water drainage is reduced, the drainage time is shortened, on the other hand, gluing operation is completed in the isolation space, and the resin effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of repairing drainage pipes, and in particular to a repairing device for environmentally friendly drainage pipes. Background Art

[0002] Environmentally friendly drainage pipes play an important role in protecting the environment, urban drainage and flood control, promoting the rational use of water resources and improving the quality of urban environment. Therefore, attention should be paid to the construction, maintenance and management of environmentally friendly drainage pipes to ensure that they can better serve the city and the environment.

[0003] Environmentally friendly drainage pipes often use steel belt corrugated pipes, which are made of high-density polyethylene (HDPE) as the base material and are formed by embedding steel belts into the pipe wall through a special process. It not only inherits the corrosion resistance, wear resistance and aging resistance of HDPE materials, but also greatly improves its compressive strength and ring stiffness due to the addition of steel belts. This makes the steel belt corrugated pipe perform well in terms of withstanding external pressure and foundation settlement, and is very suitable for environmentally friendly drainage systems.

[0004] During the use of steel belt corrugated pipes, there is a problem of pipe top subsidence (collapse). Pipe top subsidence is a local deformation problem caused by external loads, foundation settlement or material fatigue during the construction or use of the pipeline. If the pipe top subsidence is serious, it needs to be excavated for replacement and repair. If it is only a small or medium-sized collapse, it can be repaired by non-excavation repair technology.

[0005] Airbag repair is a trenchless repair technology that restores the shape of the pipeline by internal inflation and pressurization. It is suitable for the repair of small and medium-sized collapses of steel corrugated pipes. A high-pressure airbag (or inflation device) is used to apply radial pressure to the collapsed part inside the pipeline, gradually lift the sunken pipe top to reset it, and reinforce the repair area with auxiliary materials to restore the structural strength and water flow capacity of the pipeline. The auxiliary material reinforcement repair area generally adopts the local resin curing method, also known as the felt tube airbag local molding method. The glass fiber felt cloth coated with resin mixture is pressed against the inner wall of the pipeline with an airbag, and then pressurized at room temperature to achieve curing, forming a new liner to repair the local damage of the pipeline. This method is simple and fast to construct, with low cost, and is very suitable for repairing small-scale pipeline damage, such as cracks, holes, etc.; moreover, the local strength after repair is high, which can effectively prevent the damage from expanding.

[0006] At present, the connection between airbag repair and reinforcement of the repair area is not coherent. As a non-excavation repair technology, construction workers use the closed-circuit television detection system or pipeline periscope on the road surface to determine the location, scope and severity of the collapse, put the repair airbag into the pipeline in advance and pull it to the collapsed part of the corrugated pipe, and pressurize the repair airbag to expand it to lift and reset the corrugated pipe. After the corrugated pipe is lifted and repaired, the repair airbag is taken out, and then the reinforcement operation is carried out, the resin material is wrapped on the repair airbag, and then the repair airbag is pulled to the repair site again, and the expansion characteristics are used again to fix the material on the corrugated pipe.

[0007] The current repair operation is cumbersome and requires taking out the repair airbag twice at the same time. Therefore, the present invention designs a repair device for an environmentally friendly drainage pipe, which can simultaneously realize the pipe lifting and resetting and the repair site reinforcement operation at one time. Summary of the invention

[0008] According to the problems raised in the background technology, the present invention provides a repair device for environmentally friendly drainage pipes to solve the problems. The present invention will be further explained below.

[0009] A repair device for an environmentally friendly drainage pipeline comprises a repair buoy and a curing buoy connected to each other, wherein repair air bags and curing air bags are distributed on the surfaces of the repair buoy and the curing buoy.

[0010] Furthermore, the repair buoy and the curing buoy are rotatably connected, and a torsion spring is arranged at the rotation connection between the repair buoy and the curing buoy. The repair buoy and the curing buoy can be rotated according to environmental requirements and smoothly placed in the pipeline. The function of the torsion spring is to maintain the repair buoy and the curing buoy in a straight line when floating in the water through elastic force.

[0011] Furthermore, the side of the repair airbag different from the curing airbag and the side of the curing airbag different from the repair airbag are connected to a matching disc through a main shaft, and a positioning wheel is connected to the matching disc along the circumference, and the position of the positioning wheel in the radial direction exceeds the position of the repair airbag and the curing airbag before collision, so as to protect the repair airbag and the curing airbag from contacting the tube wall.

[0012] Furthermore, the curing buoy is connected with end plates on both sides, the curing buoy is rotatably arranged on the end plates, a rack is slidably arranged on the end plate close to the repair buoy, one end of the rack is connected with a rubber coating ring, the rack and the rubber coating ring are provided with connected rubber coating paths, the inner ring of the rubber coating ring is provided with a glue outlet, and the glue outlet is connected with the glue coating path; the end plate close to the repair buoy is also connected with a mounting seat and a glue injection machine, the glue injection machine is connected to the glue coating path of the rack through a hose, a motor is arranged on the mounting seat, a screw is connected to the output shaft of the motor, and a helical gear is rotatably arranged on the curing buoy, and the helical gear is meshed with the rack and the screw respectively; one end of the screw passes through the end plate and is connected with a gear, a gear ring is arranged at the end of the curing buoy, and the gear is meshed with the gear ring. The curing buoy rotates, and the glass fiber felt cloth can be covered with the resin mixture in coordination with the movement of the rubber coating ring.

[0013] Furthermore, the distribution plate is connected to a barrier airbag through the main shaft, a flow channel is arranged in the main shaft, a pump is connected to the end plate, a water inlet of the pump is connected to a water pumping pipeline, and a water outlet of the pump is connected to the flow channel in the main shaft through the water outlet pipeline. The barrier airbag is inflated by the air compressor to isolate the pipeline repair part, and the pump only needs to discharge the water in the isolated pipe section.

[0014] Furthermore, a cover is provided outside the pump, and the pumping pipe is close to the pump. The pump is positioned so as to utilize its gravity to maintain the water inlet of the pumping pipe at the lowest position, and the cover is used to provide water-proof protection for the pump.

[0015] Furthermore, an air cavity is provided on a matching disk, and the air cavity is connected to the flow channel of the main shaft through an air pipe. A repair solenoid valve, a curing solenoid valve and a blocking solenoid valve are provided on the air cavity. The repair solenoid valve and the curing solenoid valve are connected to the repair airbag and the curing airbag through pipelines, and the blocking solenoid valve is connected to the blocking airbags at both ends through pipelines.

[0016] Furthermore, a constant pressure solenoid valve is provided on the air cavity, and a constant pressure air supply pipe is connected to the constant pressure solenoid valve. After the barrier airbag expands to isolate the pipe section, the air compressor supplies air to the isolated pipe section during the process of the pump starting to drain water outward to maintain smooth drainage.

[0017] Beneficial effects: Compared with the prior art, the present invention can complete the repair and curing operations in the pipeline, isolate the repair space through the airbag, complete the gluing operation in the isolation space, and ensure the effect of the resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A schematic diagram of the structure of the repair device for environmentally friendly drainage pipes of the present invention;

[0019] Figure 2 : Schematic diagram of the internal structure of the repair device of the present invention;

[0020] Figure 3 : Figure 1 A schematic diagram of the cross-section of the structure at point A;

[0021] Figure 4 : Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0022] Figure 5 : Schematic diagram of the structure of the rack and rubber ring;

[0023] Figure 6 : Schematic diagram of the internal pipeline wiring of the repair device of the present invention.

[0024] In the figure: repair buoy 1, curing buoy 2, repair airbag 3, curing airbag 4, torsion spring 5, main shaft 6, matching disk 7, positioning wheel 8, end plate 9, rack 10, rubber coating ring 11, mounting seat 12, glue injection machine 13, hose 14, screw 15, bevel gear 16, gear 17, gear ring 18, barrier airbag 19, pump 20, water pumping pipe 21, air cavity 22, air pipe 23, constant pressure air supply pipe 24, motor 25. DETAILED DESCRIPTION

[0025] Next, combine with Figure 1-Figure 6 A specific embodiment of the present invention is described in detail.

[0026] Reference Figure 1-Figure 2 A repair device for an environmentally friendly drainage pipe comprises a repair buoy 1 and a curing buoy 2 connected to each other, and a repair airbag 3 and a curing airbag 4 are distributed on the surface of the repair buoy 1 and the curing buoy 2. The repair airbag 3 and the curing airbag 4 are essentially special high-pressure airbags (usually rubber or fiber-reinforced composite materials). The existence of the repair buoy and the curing buoy makes the repair airbag 3 and the curing airbag 4 expand radially outward when inflated, and the internal space can be used for pipeline wiring. Check valves and pressure gauges can be installed at both ends of the repair buoy and the curing buoy. The airbag is connected to an inflation device outside the drainage pipe, generally an air compressor, and the inflation and deflation of the airbag 3 can be controlled by the air compressor.

[0027] The repair buoy 1 and the curing buoy 2 float on the water in the drainage pipe, which is conducive to the traction of the overall repair device and can be quickly towed to the collapsed part of the pipe. There is no need to completely remove the water in the pipe before traction. The airbag is suspended by using the water body and does not directly contact the bottom of the pipe, thereby avoiding friction and collision to avoid wear on the repair airbag 3 and the curing airbag 4.

[0028] When reaching the collapsed part of the pipeline, the pipeline periscope determines that the repair airbag 3 is below the collapsed position, and then the air compressor starts to inflate the repair airbag 3. The repair airbag 3 gradually and slowly expands and lifts the collapsed part of the pipeline upward until the pipeline is reset. After the pipeline is reset, the repair airbag 3 releases gas to recover, and then the traction device pulls the curing airbag 4 forward to be below the repaired part. The curing airbag 4 can adopt the existing technology, pre-wrap with glass fiber felt coated with resin mixture, and the glass fiber felt is pre-wrap on the curing airbag 4 by binding rope. After the curing airbag 4 is ventilated and expanded, the binding rope breaks, and the adjacent layers of the wrapped glass fiber felt slip, and the whole is in an expanded state with the curing airbag until the glass fiber felt is pressed tightly against the inner wall of the pipeline, and shrinks after a period of compression to complete the repair.

[0029] The repair buoy 1 and the solidification buoy 2 are rotatably connected. When the pipeline is placed in the climbing well, the repair buoy 1 and the solidification buoy 2 can be rotated to reduce the space requirement and can be smoothly placed in the pipeline. A torsion spring 5 is provided at the rotation connection between the repair buoy 1 and the solidification buoy 2. The function of the torsion spring 5 is to maintain the repair buoy 1 and the solidification buoy 2 in a straight line when floating in the water body through elastic force.

[0030] There is undischarged water in the pipeline, and the buoyancy of the water body can be used to pull the device to the repair site with low resistance. The suspended airbag does not contact the bottom wall of the pipe, which can avoid damage to the airbag. If the water body is deep, in order to further protect the airbag from being scratched by the top of the pipe, this embodiment adopts the following technical solution: the side of the repair airbag 3 that is different from the solidification airbag 4, and the side of the solidification airbag 4 that is different from the repair airbag 3 are connected to the matching disk 7 through the main shaft 6. The matching disk 7 is circumferentially connected to a positioning wheel 8, and the radial position of the positioning wheel 8 exceeds the position of the repair airbag 3 and the solidification airbag 4 before the collision. During the traction process, under the premise that the torsion spring 5 maintains the repair buoy 1 and the solidification buoy 2 in a straight line, based on the existence of the positioning wheel 8, the repair airbag 3 and the solidification airbag 4 do not contact the pipe wall.

[0031] As mentioned above, there is undrained water in the traction device pipeline. Under the goal of continuous repair and curing of the present invention, a glass fiber felt cloth coated with a resin mixture can be pre-wound on the curing buoy 2. Before actual curing, the water in the pipe section needs to be completely drained, otherwise, the moisture will hinder the adhesion of the resin to the inner wall of the pipe, causing the inner lining layer to peel off or delaminate. During the resin curing process, water vapor may form bubbles or hollows, reducing the strength of the repaired structure. Therefore, after the repair of the repair airbag 3, a water pump can be used to pump out the water in the pipeline. After there is no water in the pipeline, the positioning wheel 8 is pressed on the bottom wall of the pipeline, and the torsion spring 5 maintains the repair buoy 1 and the curing buoy 2 in a straight line. At this time, the device can still be towed forward without damage, so that the curing buoy 2 is moved to the repair site.

[0032] Reference Figure 3-Figure 5 According to common sense, water will dilute the uncured resin and change its ratio (such as the ratio of curing agent), resulting in incomplete curing or decreased mechanical properties. Some resins (such as epoxy resins) may even undergo hydrolysis when in contact with water, affecting durability. Based on this, the present embodiment does not adopt the method of pre-binding glass fiber felt coated with resin mixture outside the pipeline, but instead coats the resin after draining the water in the pipeline during repair. The specific scheme is as follows: The curing buoy 2 is connected to end plates 9 on both sides, and the curing buoy 2 is rotatably set on the end plates 9. A rack 10 is slidably set on the end plate 9 close to the repair buoy 1. A rubber coating ring 11 is connected to one end of the rack 10. The rack 10 and the rubber coating ring 11 are provided with connected rubber coating channels, and the inner circumferential array of the rubber coating ring 11 is provided with a glue outlet, and the glue outlet is connected to the inner circumference of the rubber coating ring 11. A gluing channel is provided; a mounting seat 12 and a glue injector 13 are also connected to the end plate 9 on the side close to the repair buoy 1, and the glue injector 13 is connected to the gluing channel of the rack 10 through a hose 14; a motor 25 is provided on the mounting seat 12, and a screw 15 is connected to the output shaft of the motor 25; a bevel gear 16 is also rotatably provided on the curing buoy 2, and the bevel gear 16 is respectively meshed with the rack 10 and the screw 15; one end of the screw 15 passes through the end plate 9 and is connected to a gear 17, and a gear ring 18 is connected to the end of the curing buoy 2, and the gear 17 is meshed with the gear ring 18.

[0033] Outside the pipeline, glass fiber felt is pre-bound on the curing airbag 4 of the curing buoy 2 and then the device is towed to the repair site of the pipeline. After the repair is completed, the water in the pipeline is discharged and then the resin is applied. The operation steps of applying glue on site in the pipeline are as follows: the motor 25 is started, on the one hand, the rack 10 is gradually pulled out through the meshing transmission, and then the rubber ring 11 is synchronously pulled to move toward the repair buoy 1. At this time, the glue injection machine 13 injects resin into the glue channel of the rubber ring 11 through the rubber hose 14. During the movement, the rubber ring 11 applies the resin mixture on the glass fiber felt through the glue outlet on it; on the other hand, the meshing transmission of the gear 17 and the gear ring 18 drives the curing buoy 2 to rotate, and the movement of the rubber ring 11 is coordinated so that the glass fiber felt can be covered with the resin mixture. After the coating is completed, the rack 10 and the rubber ring 11 are moved to the outside of the radial expansion direction of the curing airbag 4, leaving expansion space for the curing airbag 4.

[0034] Before applying glue, it is generally necessary to completely drain the water in the pipeline, but the current method is to pump out all the water in the pipeline through a pump, which is a large amount of work and time-consuming. In this embodiment, the barrier airbag 19 is set to isolate the repair position where the device is located from the pipeline, and then only the water in the isolated space needs to be pumped out. Specifically, the distribution plate 7 is connected to the barrier airbag 19 through the main shaft, and a flow channel is set in the main shaft. The end plate 9 is connected to the pump 20, and the water suction port of the pump 20 is connected to the water suction pipeline 21. The water outlet of the pump 20 is connected to the flow channel in the main shaft through the water outlet pipeline, and then connected to the drainage pipeline outside the barrier airbag 19. Before applying glue, the barrier airbags 19 at both ends are inflated by the action of the air compressor to isolate the pipeline repair site, and then the pump 20 is started to discharge the water in the isolation pipe section from the flow channel in the main shaft.

[0035] The pump 20 is provided with a cover outside, and the pumping pipe 21 is close to the pump 20. The position of the pump 20 is set to utilize its gravity to maintain the water suction port of the pumping pipe 21 at the lowest position. At this time, the pump 20 may be immersed in the water body, and the function of the cover is to provide water-proof protection for the pump 20.

[0036] Reference Figure 1 and Figure 6 In the present invention, an external air compressor needs to infuse gas into the repair airbag 3, the curing airbag 4 and the barrier airbag 19 respectively. This embodiment adopts the following pipeline wiring scheme: an air cavity 22 is provided on a distribution plate 7, and the air cavity 22 is connected to the flow channel of the main shaft through an air pipe 23, and the external air compressor is connected to the flow channel of the main shaft through a pipeline; a repair solenoid valve, a curing solenoid valve and a barrier solenoid valve are provided on the air cavity 22, and the repair solenoid valve and the curing solenoid valve are connected to the repair airbag 3 and the curing airbag 4 through a pipeline, and the barrier solenoid valve is connected to the barrier airbags 19 at both ends through a pipeline, and gas can be infused or released to different airbag structures by controlling the on-off control of the solenoid valve.

[0037] A constant pressure solenoid valve is also provided on the air cavity 22, and a constant pressure air supply pipe 24 is connected to the constant pressure solenoid valve. After the barrier airbag 19 expands to isolate the pipe section, the pump 20 starts to drain water outward, and the air pressure in the isolated pipe section decreases. Therefore, during the drainage process, the constant pressure solenoid valve opens, and the air compressor replenishes air to the isolated pipe section to maintain smooth drainage.

[0038] The repair solenoid valve, curing solenoid valve, blocking solenoid valve and constant pressure solenoid valve are conventional solenoid valves, and the repair airbag and curing airbag are also conventional repair airbags, which are distinguished from each other only by naming in this embodiment. The two main axes of the present invention, one is connected to the external air compressor as the gas injection and release channel, and the other is connected to the pump as the drainage channel of the isolation pipe section. In the description of the following working principle, the airflow main axis and the drainage main axis are used as distinctions.

[0039] The steps for repairing the environmentally friendly drainage pipe using the present invention are as follows:

[0040] In the first step, on the roadbed, a glass fiber felt cloth not coated with the resin mixture is wound around the curing airbag 4 of the curing buoy 2 and pre-tied with a binding rope, and the device is placed into the drainage pipe section through a climbing well, suspended on it, and the traction rope is pulled through a periscope to tow the device to the collapsed part of the pipe;

[0041] In the second step, the periscope is used to determine that the repair airbag 3 is below the collapsed position, the air compressor is started, the repair solenoid valve is opened, and the air compressor gradually infuses gas into the repair airbag 3, the repair airbag 3 slowly expands, and the collapsed part of the pipeline is lifted and repaired. After the repair, the repair airbag 3 releases gas, and the repair solenoid valve is closed after the repair airbag 3 recovers;

[0042] In the third step, the traction device moves forward, and the periscope is used to determine that the curing airbag 4 is below the collapsed repair position, the blocking solenoid valve is opened, and the air compressor gradually infuses gas into the blocking airbag 19, and the blocking airbag 19 slowly expands until it is pressed tightly against the inner wall of the pipeline to isolate the pipe section, and the blocking solenoid valve is opened and closed to maintain the isolation state of the isolated pipe section;

[0043] Step 4: The constant pressure solenoid valve is opened, the pump 20 is started, and the water pumping pipe 21 discharges the water in the isolation pipe section from the flow channel in the drainage main shaft. The air compressor injects gas into the isolation pipe section to fill the space after the water is discharged. After the water is discharged, the pump 20 stops and the constant pressure solenoid valve is closed.

[0044] In the fifth step, the motor 25 is started. On the one hand, the rack 10 is gradually pulled out through meshing transmission, and then the rubber coating ring 11 is synchronously pulled to move toward the repair buoy 1. The glue injection machine 13 injects resin into the glue coating channel of the rubber coating ring 11 through the rubber hose 14. The rubber coating ring 11 applies the resin mixture to the glass fiber felt cloth through the glue outlet thereon during the movement; on the other hand, the curing buoy 2 is driven to rotate through the meshing transmission of the gear 17 and the gear ring 18, and the glass fiber felt cloth can be covered with the resin mixture in coordination with the movement of the rubber coating ring 11. After the coating is completed, the rack 10 and the rubber coating ring 11 are stationary outside the radial expansion direction of the curing airbag 4;

[0045] Step 6: The curing solenoid valve is opened, and the air compressor injects gas into the curing airbag 4. The curing airbag 4 collides slowly, first breaking the pre-bound rope, and then pressing the glass fiber felt coated with the resin mixture on the pipeline repair part to achieve the purpose of curing. After curing, the curing airbag 4 releases gas to recover, and the curing solenoid valve is closed;

[0046] In the seventh step, after the solidification airbag 4 is restored, the motor 25 is started to reset the rack 10 and the rubber ring 11, the blocking solenoid valve is opened, the blocking airbag 19 releases the gas, the blocking airbag 19 is restored, the water outside the pipeline flows back, the device floats on the water again, and the device is taken out by the traction device to complete the repair operation.

[0047] The present invention can complete the repair and curing operations in the pipeline, and isolates the repair space through the airbag, which reduces the workload of water discharge and shortens the drainage time on the one hand, and completes the glue coating operation in the isolation space on the other hand, ensuring the effect of the resin.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A repair device for an environmentally friendly drainage pipe, characterized in that: The invention comprises a repair buoy (1) and a curing buoy (2) which are connected to each other, and repair air bags (3) and curing air bags (4) are distributed on the surfaces of the repair buoy (1) and the curing buoy (2).

2. The repair device for environmentally friendly drainage pipes according to claim 1 is characterized in that: The repair buoy (1) and the curing buoy (2) are rotationally connected, and a torsion spring (5) is provided at the rotationally connected position between the repair buoy (1) and the curing buoy (2).

3. The repair device for environmentally friendly drainage pipes according to claim 1 is characterized in that: The side of the repair airbag (3) different from the curing airbag (4), and the side of the curing airbag (4) different from the repair airbag (3) are connected to a matching disc (7) via a main shaft (6); a positioning wheel (8) is connected to the matching disc (7) along the circumferential direction; the radial position of the positioning wheel (8) exceeds the position of the repair airbag (3) and the curing airbag (4) before the collision.

4. The repair device for environmentally friendly drainage pipes according to claim 3 is characterized in that: The curing buoy (2) is connected to end plates (9) on both sides. The curing buoy (2) is rotatably arranged on the end plates (9). A rack (10) is slidably arranged on the end plate (9) close to the repairing buoy (1). One end of the rack (10) is connected to a rubber coating ring (11). The rack (10) and the rubber coating ring (11) are provided with connected rubber coating channels. The inner ring of the rubber coating ring (11) is provided with a rubber outlet, and the rubber outlet is connected to the rubber coating channel. The end plate (9) close to the repairing buoy (1) is also connected to a mounting seat (12) and a rubber injection machine (13). The rubber injection machine (13) is connected to the end plate (9) close to the repairing buoy (1). The machine (13) is connected to the gluing path of the rack (10) through a rubber hose (14); a motor (25) is provided on the mounting seat (12); a screw (15) is connected to the output shaft of the motor (25); a helical gear (16) is rotatably provided on the curing buoy (2); the helical gear (16) is respectively meshed with the rack (10) and the screw (15); one end of the screw (15) passes through the end plate (9) and is connected to a gear (17); a gear ring (18) is provided at the end of the curing buoy (2); the gear (17) is meshed with the gear ring (18).

5. The repair device for environmentally friendly drainage pipes according to claim 4 is characterized in that: The distribution plate (7) is connected to a barrier airbag (19) via a main shaft, a flow channel is arranged in the main shaft, a pump (20) is connected to the end plate (9), a water suction port of the pump (20) is connected to a water suction pipe (21), and a water outlet of the pump (20) is connected to the flow channel in the main shaft via the water outlet pipe.

6. The repair device for environmentally friendly drainage pipes according to claim 5 is characterized in that: The pump (20) is provided with a casing outside, and the water pumping pipeline (21) is close to the pump (20).

7. The repair device for environmentally friendly drainage pipes according to claim 5 is characterized in that: An air cavity (22) is provided on a matching disc (7), and the air cavity (22) is connected to the flow channel of the main shaft through an air pipe (23). A repair solenoid valve, a curing solenoid valve and a blocking solenoid valve are provided on the air cavity (22). The repair solenoid valve and the curing solenoid valve are connected to the repair airbag (3) and the curing airbag (4) through pipelines, and the blocking solenoid valve is connected to the blocking airbags (19) at both ends through pipelines.

8. The repair device for environmentally friendly drainage pipes according to claim 7 is characterized in that: The air cavity (22) is also provided with a constant-pressure electromagnetic valve, which is connected to a constant-pressure air supply pipe (24).

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