A grouting repair device and method for defects in brick coal gas ducts

Abstract

This invention discloses a grouting repair device and method for defects in brick gas ducts. The repair device includes a tee pipe, a grouting pipeline, a grouting mechanism, a drain valve, and a grouting connector. The grouting connector has an internal connecting pipe, which is connected to a long grouting pipe. This grouting repair device can repair defects such as fractures, cracks, and breaks in brick gas ducts, especially defects whose specific locations cannot be determined. During use, this grouting repair device does not require prior detection of the defect location, allowing for direct blind repair without worrying about missing any defects. It is not limited by the number and size of defects in the brick gas duct, resulting in high repair efficiency and good effect.

Description

Technical Field

[0001] This invention relates to the field of brick-and-coal gas duct repair technology, specifically to a grouting repair device and method for repairing defects in brick-and-coal gas ducts. Background Technology

[0002] Cracks, damage, and even breakage can easily occur in the brick gas ducts of the coke oven gas heating system, especially at the coke oven head. When cracks appear, the gas can enter other spaces and burn at the bottom of the combustion chamber or in the inclined duct during heating. This not only wastes gas but also affects heating, resulting in poor coke maturation at the oven head.

[0003] To repair these defects, the existing method is to directly spray grout through grouting pipes. However, this method has two drawbacks: poor grout adhesion to the wall and the need to accurately locate the defects beforehand. This positioning process is cumbersome and difficult. Furthermore, when multiple defects are found in the brick gas duct, each defect needs to be located and repaired one by one, resulting in a large workload, low efficiency, and the need for multiple people to work together to complete the repair. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a grouting repair device and method for repairing defects in brick coal gas ducts.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A grouting repair device for defects in brick coal gas ducts includes a three-way pipe. One port of the three-way pipe is connected to a grouting mechanism via a grouting pipeline. Another port of the three-way pipe is equipped with a drain valve. A third port of the three-way pipe is connected to a grouting connector. The grouting connector has a connecting pipe inside. One end of the connecting pipe is closedly connected to the grouting connector, leaving an outlet for the connecting pipe. The other end of the connecting pipe is connected to a grouting pipe. The grouting connector has an open grouting port at the end connected to the grouting pipe. The length of the grouting pipe is more than ten times the length of the grouting connector.

[0007] This brick gas duct defect grouting repair device has a simple structure, is easy to connect, install and use. It can repair defects such as fractures, cracks and breaks in brick gas ducts, especially defects whose specific locations cannot be determined. This grouting repair device does not require prior detection of defect locations during use, and can directly repair blindly without worrying about missing defect locations. It is not limited by the number and size of defects in the brick gas duct, and has high repair efficiency and good effect.

[0008] The grouting pipe connected to the connecting pipe is a relatively long pipe, several meters long. It is inserted into the brick gas duct. During the grouting process, this grouting pipe is not used for grouting. Instead, it is used to determine whether the grout has filled the entire brick gas duct. Specifically, the grout will only enter the grouting pipe after it rises to the top position in the brick gas duct. When grout overflows from the grouting pipe, it can be determined that the brick gas duct is full. A brick gas duct filled with grout allows the grout to enter or penetrate into every crack or defect, and can repair all cracks and damaged parts inside, resulting in a good sealing effect.

[0009] The purpose of the slurry pipe is not only to determine whether the slurry is full, but also to guide the slurry and vent air, which is conducive to the full filling of the slurry. It can also reduce the volume of the air duct by utilizing the space occupied by the slurry pipe itself, which means that the amount of slurry to be filled can be reduced. The slurry only needs to fill the area between the slurry pipe and the brick coal gas duct.

[0010] With the above improvements, this grouting repair device can be operated by a single person, reducing manpower compared to traditional repair methods. It also has low requirements for construction space and can effectively solve problems such as insufficient height space in basements, limited space with blast furnace gas pipelines at the furnace head, and misaligned pipe bricks that are difficult to repair with grouting.

[0011] Furthermore, the side wall of the grouting connector is connected to and communicates with the tee pipe, the bottom of the grouting connector is provided with the outlet, and the interior of the grouting connector is provided with the connecting pipe integrally formed at the outlet.

[0012] Furthermore, the grouting pipe includes a riser and a flexible pipe connected to the riser. The end of the flexible pipe is provided with a rigid pipe head. The riser is detachably connected to the connecting pipe. The length of the riser is 20 to 100 cm, and the length of the flexible pipe is not less than 200 cm.

[0013] The flexible tube design gives the slurry tube a certain degree of flexibility, allowing it to adapt to changes in the brick-coal gas duct and making it easier to insert into irregularly shaped and oriented brick-coal gas ducts.

[0014] Furthermore, the connecting pipe and the riser are both metal pipes, the flexible pipe is a metal corrugated pipe, or the body of the flexible pipe is a composite plastic, and the body of the pipe has a spirally extending elastic metal wire along the length direction.

[0015] Furthermore, an adaptive scraper assembly is provided on the outer periphery of the end of the slurry pipe. The adaptive scraper assembly includes multiple scrapers arranged around the outer periphery of the slurry pipe. The scrapers are connected to the slurry pipe through an adaptive telescopic rod. The scrapers are provided in at least two layers, with 2 to 5 scrapers arranged at intervals in each layer. The scrapers in the upper and lower layers are staggered.

[0016] When the slurry pipe is removed after slurry discharge, the scraper can scrape the inner wall of the brick gas duct during the process of the slurry pipe exiting along the original route. On the one hand, it can remove the excess slurry adhering to the inner wall of the brick gas duct, and on the other hand, it can help the outer surface of the slurry at the defect repair site to be flush with the inner wall of the brick gas duct, thus achieving a more complete repair effect.

[0017] Furthermore, a spring is also sleeved on the outer periphery of the adaptive telescopic rod, and the two ends of the spring are respectively connected to the scraper and the slurry pipe; the scraper is a fan-shaped scraper, and scraping parts are provided below or above and below the scraper.

[0018] Furthermore, the end face of the slurry pipe is also provided with several limiting rods.

[0019] Furthermore, the inner circumference of the end of the slurry pipe is connected to an airbag support via several radial spokes. The airbag support is equipped with an inflatable airbag, which seals the end of the slurry pipe after inflation. The inflatable airbag expands and seals the upper end in time after the brick-coal gas channel is filled. This helps to keep the slurry in the brick-coal gas channel and reduces the increase in grouting volume due to overflow. The inner wall of the end of the slurry pipe or the radial spokes are also equipped with a material sensor, which can detect the slurry flowing into the slurry pipe in time.

[0020] Furthermore, the grouting mechanism includes a trolley with a grout tank on it. The grout tank is connected to the grouting pipeline via a pressure grouting pump. The grouting pipeline is also equipped with a grouting valve and a pressure gauge.

[0021] Furthermore, a grouting repair method for defects in brick gas ducts includes the following steps:

[0022] Select a grouting pipe according to the length of the brick gas duct to be repaired, connect the grouting pipe to the grouting connector, connect the tee pipe and the grouting mechanism through the grouting pipeline, and prepare mud slurry in the grouting mechanism;

[0023] Insert the grouting pipe into the brick gas duct from the lower position until the grouting pipe is fully inserted into the brick gas duct. The grouting connector abuts against the opening of the brick gas duct and seals it in place.

[0024] Close the drain valve, open the grouting mechanism, and inject the slurry into the brick gas duct along the grouting port of the grouting connector;

[0025] Continuously inject mud slurry. If mud slurry is observed or detected in the slurry pipe, it is determined that the mud slurry has reached the top of the brick gas duct and filled the brick gas duct. At this time, stop injecting mud slurry and maintain the full slurry state for several minutes.

[0026] Then, the drain valve is opened to discharge the mud material in the brick gas duct; after the mud material is recovered, the grouting repair device is removed, and the operation is completed.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The grouting repair device for defects in brick gas ducts has a simple structure, is easy to connect, install and use, and can repair defects such as fractures, cracks and breaks in brick gas ducts, especially defects whose specific locations cannot be determined. During use, the grouting repair device does not require prior detection of the defect location, allowing for direct blind repair without worrying about missing any defects. It is not limited by the number and size of defects in the brick gas duct, resulting in high repair efficiency and good effect. 2. The grouting pipe can be used to determine whether the grout has filled the entire brick gas duct. The grout will only enter the grouting pipe after it rises to the top position. When grout overflows from the grouting pipe, it can be determined that the brick gas duct is full. A full grouting pipe allows the grout to enter or penetrate every cracked defect, repairing all internal cracks and breaks with good sealing effect. 3. The grouting pipe, in addition to determining the grout level, also serves to improve the grouting performance of the brick gas duct. The filling of the grouting pipe not only serves to guide the slurry and facilitate venting, but also reduces the volume of slurry required to fill the gas duct by utilizing the space occupied by the grouting pipe itself. This reduces the amount of slurry needed. 4. With these improvements, this grouting repair device can be operated by a single person, reducing labor costs compared to traditional repair methods and requiring less space. 5. The scraper, installed during the retraction of the grouting pipe, scrapes the inner wall of the brick gas duct, removing excess slurry adhering to it. This also ensures the slurry surface at the repair site is flush with the inner wall of the brick gas duct, achieving a more complete repair effect. 6. This method can effectively repair defects at uncertain locations on the inner wall of the brick gas duct in one go. The slurry effectively seals these gaps, improving the overall sealing of the brick gas duct. This reduces gas waste during production, ensures heating efficiency, and guarantees the coke maturation effect at the furnace head. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the structure of a grouting repair device for defects in brick coal gas ducts according to the present invention;

[0029] Figure 2 This is a schematic diagram of the grouting connector of the present invention;

[0030] Figure 3 This is a schematic diagram of the upper part of the grouting pipe of the present invention;

[0031] Figure 4 This is a schematic diagram of one arrangement of the scrapers on the slurry pipe according to the present invention;

[0032] Figure 5 This is a schematic diagram of another arrangement of the scrapers on the slurry pipe of the present invention;

[0033] Figure 6 This is a schematic diagram of another structure of the scraper on the slurry pipe of the present invention;

[0034] Figure 7 This is a schematic diagram of the installation of the inflatable airbag inside the slurry pipe of the present invention. Figure 1 ;

[0035] Figure 8 This is a schematic diagram of the installation of the inflatable airbag inside the slurry pipe of the present invention. Figure 2 ;

[0036] In the diagram: 1. Tee pipe; 2. Grouting pipeline; 3. Drain valve; 4. Grouting connector; 5. Connecting pipe; 6. Grouting pipe; 601. Riser; 602. Flexible pipe; 603. Rigid pipe head; 604. Elastic metal wire; 7. Drain outlet; 8. Grouting port; 9. Scraper; 901. Scraping part; 10. Adaptive telescopic rod; 11. Spring; 12. Limiting rod; 13. Radial spokes; 14. Airbag support; 15. Inflatable airbag; 16. Material sensor; 17. Air pipe. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] like Figure 1 and Figure 2 As shown, a grouting repair device for defects in a brick coal gas duct includes a three-way pipe 1. One port of the three-way pipe 1 is connected to a grouting mechanism via a grouting pipe 2. Another port of the three-way pipe 1 is equipped with a drain valve 3. A third port of the three-way pipe 1 is connected to a grouting connector 4. The grouting connector 4 has a connecting pipe 5 inside. One end of the connecting pipe 5 is closedly connected to the grouting connector 4, leaving an outlet 7 below the connecting pipe. The other end of the connecting pipe 5 is connected to a grouting pipe 6. The grouting connector 4 has an open grouting port 8 at the end connected to the grouting pipe. The length of the grouting pipe 6 is more than ten times the length of the grouting connector 4.

[0040] This brick gas duct defect grouting repair device has a simple structure, is easy to connect, install and use. It can repair defects such as fractures, cracks and breaks in brick gas ducts, especially defects whose specific locations cannot be determined. This grouting repair device does not require prior detection of defect locations during use, and can directly repair blindly without worrying about missing defect locations. It is not limited by the number and size of defects in the brick gas duct, and has high repair efficiency and good effect.

[0041] The tee pipe 1 can simultaneously connect the grouting pipe 2, the drain valve 3, and the grouting connector 4. The grouting connector 4 is used to connect to the opening on the brick gas duct so that the slurry can enter the brick gas duct from the grouting pipe, the tee pipe, and the grouting connector.

[0042] The grouting connector 4 and the connecting pipe inside it can form a grouting channel that is closed at the bottom and open at the top. The connecting pipe 5 is a through structure, and the lower outer periphery of the connecting pipe 5 is closed to the inner periphery of the grouting connector, so that the slurry entering the grouting connector will not flow out from there.

[0043] The grouting pipe 6 connected to the connecting pipe 5 is a relatively long pipe, several meters long. It is inserted into the brick gas duct. During the grouting process, the grouting pipe 6 is not used for grouting. Instead, it is used to determine whether the grout has filled the entire brick gas duct. Specifically, the grout will only enter the grouting pipe 6 after it rises to the top position. When grout overflows from the grouting pipe 6, it can be determined that the brick gas duct is full. A brick gas duct filled with grout allows the grout to enter or penetrate into every crack or defect, and can repair all cracks and damaged parts inside, resulting in a good sealing effect.

[0044] The purpose of the slurry pipe 6 is not only to determine whether the slurry is full, but also to guide the slurry and release air, which is beneficial for the full filling of the slurry. It can also reduce the volume of the gas duct by utilizing the space occupied by the slurry pipe 6 itself, that is, to reduce the amount of slurry to be filled. The slurry only needs to fill the area between the slurry pipe and the brick gas duct. In some embodiments, the diameter of the slurry pipe can be set to be larger. If the slurry pipe 6 is not set and the slurry is directly injected into the brick gas duct, the amount of slurry will be very large and it will be difficult to fill the slurry completely, because the residual gas in the brick gas duct is not easy to be discharged, and it is also difficult to set up an exhaust pipe in the brick gas duct.

[0045] With the above improvements, this grouting repair device can be operated by a single person, reducing manpower compared to traditional repair methods. It also has low requirements for construction space and can effectively solve problems such as insufficient height space in basements, limited space with blast furnace gas pipelines at the furnace head, and misaligned pipe bricks that are difficult to repair with grouting.

[0046] Furthermore, the side wall of the grouting connector 4 is connected to and communicates with the tee pipe, the bottom of the grouting connector 4 is provided with the outlet 7, and the interior of the grouting connector 4 is provided with the connecting pipe 5 integrally formed at the outlet 7.

[0047] The connecting pipe 5 can be integrated with the grouting connector 4 for use; the connecting pipe 5 can be inside the grouting connector 4 or extend out of the grouting connector 4; the upper opening of the grouting connector 4 is provided with a joint structure for docking with the opening of the brick gas duct.

[0048] Furthermore, the slurry pipe 6 includes a riser 601 and a flexible pipe 602 connected to the riser 601. The end of the flexible pipe 602 is provided with a rigid pipe head 603. The riser 601 is detachably connected to the connecting pipe 5. The length of the riser 601 is 20 to 100 cm, and the length of the flexible pipe 602 is not less than 200 cm.

[0049] The flexible tube 602 provides the slurry pipe with a certain degree of flexibility, allowing it to adapt to changes in the brick gas duct and making it easier to insert into the entire duct. This is because some brick gas ducts are not straight and have bends or curves; a rigid tube throughout would hinder insertion. The flexible tube 602 is typically around 3 meters long. While flexible, it is not a completely flexible tube; it also possesses a certain strength to maintain its tubular shape and prevent self-twisting or tangling. The rigid tube head 603, relative to the flexible tube 602, is slightly stiffer for easier insertion and can also be used to mount auxiliary tools.

[0050] Furthermore, the connecting pipe 5 and the riser 601 are metal pipes, and the flexible pipe 602 is a metal corrugated pipe.

[0051] In some embodiments, the body of the flexible tube 602 can also be made of composite plastic, and the tube body is provided with a spirally extended elastic metal wire 604 along the length direction. The resulting flexible tube has both flexibility and strength, good torsion control performance and adaptability, and can better adapt to the shape and direction of the brick gas duct.

[0052] In some embodiments, the spiral of the elastic metal wire 604 is arranged to gradually increase in density from one end to the other. Depending on the density of the spiral arrangement of the elastic metal wire 604, the flexible tube can have different flexibility and elasticity at different positions. The spiral formed by the elastic metal wire can also be arranged in a cyclical manner from sparse to dense, and this arrangement is a gradual change in cyclical manner.

[0053] In some embodiments, the outer periphery of the slurry pipe 6 is provided with a hydrophilic coating, which makes the surface smooth when it encounters slurry, reducing friction and adhesion. This allows the slurry to be better injected into the brick gas duct and fill any defects. During subsequent slurry discharge, the slurry also flows out more easily without adhering to the slurry pipe. The hydrophilic coating on the inner periphery of the slurry pipe also allows the overflowing slurry to flow downwards, making it easier to observe that the brick gas duct is filled in a timely manner.

[0054] Furthermore, such as Figures 3-5 As shown, the outer periphery of the end of the slurry pipe 6 is also provided with an adaptive scraper assembly. The adaptive scraper assembly includes a plurality of scrapers 9 arranged around the outer periphery of the rigid pipe head 603 of the slurry pipe. The scrapers 9 are connected to the slurry pipe 6 through an adaptive telescopic rod 10. The scrapers 9 are provided in at least two layers, with 2 to 5 scrapers 9 arranged at intervals in each layer. The scrapers 9 in the upper and lower layers are staggered.

[0055] When the slurry pipe is removed after the slurry discharge, the scraper 9 can scrape the inner wall of the brick gas duct during the process of the slurry pipe 6 exiting along the original route. On the one hand, it can remove the excess slurry adhering to the inner wall of the brick gas duct, and on the other hand, it can also make the outer surface of the slurry at the defect repair site flush with the inner wall of the brick gas duct, so as to achieve a more perfect repair effect.

[0056] Since the internal shape and curvature of the brick-coal gas duct may change, the connection of the scraper 9 is set to be flexible, so that it can be adjusted according to its position to prevent it from getting stuck in the gas duct. There is a gap between each layer of scraper 9 to provide space for their adjustment. The upper and lower layers of scraper 9 can cover the gap by staggering, so that the entire inner circumference of the brick-coal gas duct can be scraped.

[0057] Furthermore, a spring 11 is also sleeved on the outer periphery of the adaptive telescopic rod 10. The two ends of the spring 11 are respectively connected to the scraper 9 and the slurry pipe 6. Such connection can improve stability and support performance, and allow the scraper to better fit the inner wall of the brick gas duct. The scraper 9 is generally a fan-shaped scraper, and a scraping part 901 is provided below the scraper 9.

[0058] In some implementations, such as Figure 6 As shown, scraping parts 901 are provided at both the top and bottom of the scraper 9. In this way, during the process of inserting the grouting pipe into the brick gas duct, the inner wall of the brick gas duct is cleaned once by the scraping part at the front end, which is more conducive to grouting repair.

[0059] Furthermore, the end face of the slurry pipe 6 is also provided with several limiting rods 12. When the slurry pipe 6 is inserted into place, the limiting rods 12 abut against the end of the brick gas pipe, so that there is a gap between the end face of the slurry pipe 6 and the inner end of the brick gas pipe. This allows the mud slurry to overflow into the slurry pipe, so that it can be judged.

[0060] In some implementations, such as Figure 7 As shown in Figure 8, the inner circumference of the end of the slurry pipe 6 is also connected to an airbag support 14 by a number of radial spokes 13. The airbag support 14 is provided with an inflatable airbag 15, which closes the end of the slurry pipe 6 after inflation.

[0061] Under normal circumstances, grouting can be stopped once the brick gas duct is determined to be full, and the grouting pipe does not need to be sealed. In order to further improve the penetration and repair capabilities of the grout, the inflatable airbag 15 can be installed at the upper end of the grouting pipe. After the brick gas duct is full, the upper end can be sealed in time. This helps the grout to remain in the brick gas duct, reduces the amount of grouting to be increased due to overflow, and can also maintain a certain static pressure.

[0062] Since there are flues or combustion chambers outside the brick gas duct, some cracks exist in these locations. It is not desirable for the slurry to penetrate excessively, so as not to affect the flues or combustion chambers. Therefore, it is sufficient to maintain a normal filling state or slight pressure.

[0063] The inflatable airbag 15 is connected to an air tube 17 at its lower end. The air tube 17 can be led out through the outlet 7 of the connecting pipe along the inside of the slurry pipe. It can be inflated and deflated. After inflation, the airbag expands and can seal the slurry pipe.

[0064] A material sensor 16 is also provided on the inner wall of the end of the slurry pipe 6 or on the radial spoke 13. When slurry overflows into the slurry pipe 6, the material sensor 16 can detect it in time, so that it can quickly determine that the slurry has filled the brick gas duct, instead of waiting for the slurry to flow out from the outlet.

[0065] Furthermore, the grouting mechanism includes a trolley with a grout tank. The grout tank is connected to the grouting pipeline via a pressure grouting pump. The grouting pipeline is also equipped with a grouting valve and a pressure gauge. The pressure grouting pump can inject grout into the tee pipe, the grouting connector, and the brick gas duct.

[0066] Furthermore, a grouting repair method for defects in brick gas ducts includes the following steps:

[0067] Select a suitable grouting pipe 6 according to the length of the brick gas duct to be repaired, connect the grouting pipe 6 to the grouting connector 4, connect the grouting pipeline 2 to the tee pipe 1 and the grouting mechanism, and prepare mud slurry in the grouting mechanism;

[0068] Insert the grouting pipe 6 into the brick gas duct from the lower position until the grouting pipe is fully inserted into the brick gas duct. The grouting connector 4 abuts against the opening of the brick gas duct and seals it. After setting the sealing ring, tighten it, or after the flange face with the sealing ring is connected, fix it with bolts.

[0069] Close the drain valve and open the grouting mechanism to allow the slurry to be injected into the brick gas duct along the grouting port of the grouting connector.

[0070] Continuously inject mud slurry. If mud slurry is observed or detected in the slurry pipe, it is determined that the mud slurry has reached the top of the brick gas duct and filled the brick gas duct. At this time, stop injecting mud slurry and maintain the full slurry state for several minutes.

[0071] Specifically, the sealing slurry is slowly pumped upwards from the outer wall of the slurry pipe and the inner wall formed by the brick gas duct using a pressure of 0.8 MPa. When the slurry rises to a height of more than three meters, it will flow inwards along the upper end of the slurry pipe. After the injection of the slurry is stopped, the slurry fills and seals the defective position (cracks, fissures) in the brick wall for two minutes.

[0072] Then, the drain valve 3 is opened, and the mud material in the brick gas duct is discharged through the three-way pipe 1; after the mud material is recovered, the grouting repair device is removed, and the operation is completed.

[0073] During the disassembly of the grouting connector and the extraction of the grouting pipe, since most of the grout has been discharged, some grout will still adhere to the inner wall of the brick gas duct. When the grouting pipe is pulled out, the scraper on the outer periphery of the upper end of the grouting pipe will further scrape off the remaining grout.

[0074] The above method can effectively repair defects in various uncertain locations on the inner wall of the brick gas duct in one go. The slurry can effectively seal these gaps and defects, thereby improving the overall sealing of the brick gas duct. This can reduce gas waste during production and ensure heating effect. The temperature of the switch under the small flue drops from 210℃ to 145℃, and the furnace head temperature rises from 1011℃ to 1079℃, ensuring the coke maturation effect of the furnace head.

[0075] This grouting repair method utilizes static pressure to allow the grout to self-permeate and seal the inner wall of the entire brick gas duct, thus completing the repair on its own. This reduces the difficulty of single-point repair positioning, while also greatly improving repair efficiency for multiple repairs. Furthermore, it reduces the amount of grout injected and recovers excess grout, minimizing waste of repair materials.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for repairing a defect in a brick gas flue by grouting, characterized in that, The system includes a three-way pipe, one port of which is connected to a grouting mechanism via a grouting pipeline. Another port of the three-way pipe is equipped with a drain valve. A third port of the three-way pipe is connected to a grouting coupling pipe. The grouting coupling pipe has an internal connecting pipe. One end of the connecting pipe is sealed to the grouting coupling pipe, leaving an outlet. The other end of the connecting pipe is connected to a grouting pipe. The grouting coupling pipe has an open grouting port at the end connected to the grouting pipe. The length of the grouting coupling pipe is more than ten times the length of the grouting coupling pipe. The grouting pipe includes a riser and a flexible pipe connected to the riser. The end of the flexible pipe has a rigid pipe head. The riser is detachably connected to the connecting pipe. The length of the riser is 20–100 cm, and the length of the flexible pipe is not less than 200 cm. The inner circumference of the end of the slurry pipe is also connected to an airbag support by several radial spokes. The airbag support is equipped with an inflatable airbag, which seals the end of the slurry pipe after inflation. A material sensor is also provided on the inner wall of the end of the slurry pipe or on the radial spokes.

2. The grouting repair device for defects in brick coal gas ducts according to claim 1, characterized in that, The side wall of the grouting connector is connected to and communicates with the tee pipe. The bottom of the grouting connector is provided with the outlet. The interior of the grouting connector is provided with the connecting pipe integrally formed at the outlet.

3. The grouting repair device for defects in brick coal gas ducts according to claim 1, characterized in that, The connecting pipe and the riser are both metal pipes, the flexible pipe is a metal corrugated pipe, or the body of the flexible pipe is a composite plastic, and the body of the pipe has a spirally extending elastic metal wire along the length direction.

4. The grouting repair device for defects in brick coal gas ducts according to claim 1, characterized in that, An adaptive scraper assembly is also provided on the outer periphery of the end of the slurry pipe. The adaptive scraper assembly includes multiple scrapers arranged around the outer periphery of the slurry pipe. The scrapers are connected to the slurry pipe through adaptive telescopic rods. The scrapers are provided in at least two layers, with 2 to 5 scrapers arranged at intervals in each layer. The scrapers in the upper and lower layers are staggered.

5. The grouting repair device for defects in brick coal gas ducts according to claim 4, characterized in that, The outer periphery of the adaptive telescopic rod is also fitted with a spring, and the two ends of the spring are respectively connected to the scraper and the slurry pipe; the scraper is a fan-shaped scraper, and scraping parts are provided below or above and below the scraper.

6. The grouting repair device for defects in brick coal gas ducts according to claim 1, characterized in that, The end face of the grouting pipe is also provided with several limiting rods.

7. The grouting repair device for defects in brick coal gas ducts according to claim 1, characterized in that, The grouting mechanism includes a trolley with a grout tank on it. The grout tank is connected to the grouting pipeline via a pressure grouting pump. The grouting pipeline is also equipped with a grouting valve and a pressure gauge.

8. A grouting repair method having the grouting repair device for defects in brick gas ducts as described in any one of claims 1 to 7, characterized in that, The grouting repair method includes the following steps: Select a grouting pipe according to the length of the brick gas duct to be repaired, connect the grouting pipe to the grouting connector, connect the tee pipe and the grouting mechanism through the grouting pipeline, and prepare mud slurry in the grouting mechanism; Insert the grouting pipe into the brick gas duct from the lower position until the grouting pipe is fully inserted into the brick gas duct. The grouting connector abuts against the opening of the brick gas duct and seals it in place. Close the drain valve, open the grouting mechanism, and inject the slurry into the brick gas duct along the grouting port of the grouting connector; Continuously inject mud slurry. If mud slurry is observed or detected in the slurry pipe, it is determined that the mud slurry has reached the top of the brick gas duct and filled the brick gas duct. At this time, stop injecting mud slurry and maintain the full slurry state for two minutes. Then, the drain valve is opened to discharge the mud material in the brick gas duct; after the mud material is recovered, the grouting repair device is removed, and the operation is completed.

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