A composite flexible pressure-resistant inner liner tube, its preparation method and application

Abstract

This invention belongs to the field of pipeline repair technology, and particularly relates to a composite flexible pressure-resistant inner liner pipe, its preparation method, and its application. It includes a supporting structural layer, which is bonded to the inner wall of a pressure-bearing structural layer with resin adhesive. The pressure-bearing structural layer is attached to the inner wall of the outer pipeline to be repaired. The pressure-bearing structural layer is a single-sided coated circular woven pipe composed of a circular woven tube and a coated adhesive formed by extrusion on its outer wall. The supporting structural layer consists of a single-sided coated felt hose and resin adhesive impregnated on it. The single-sided coated felt hose is bonded to the inner wall of the single-sided coated circular woven tube with resin adhesive. After the coated adhesive is extruded onto the outer wall of the single-sided coated circular woven tube, it can withstand internal pressures of up to 30-50 MPa when transporting media, basically covering the pressure range of industrial and civil pressure pipelines. The single-sided coated felt hose can independently bear all pressures except for the internal pressure of the transported medium, such as the vacuum pressure inside the pipeline, soil load on the pipeline, and dynamic load, enabling pipeline regeneration and thus extending its service life.

Description

Technical Field

[0001] This invention belongs to the field of pipeline repair technology, and particularly relates to a composite flexible pressure-resistant inner liner pipe, its preparation method and application. Background Technology

[0002] Existing trenchless pipeline repair methods can be divided into two modes: independent pressure bearing and composite pressure bearing. Existing independent pressure bearing rigid lining repair technologies, represented by CIPP (in-situ curing), are all field curing reaction (or field assembly) technologies. That is, the pipe forming and project implementation are completed simultaneously. If quality defects occur, the lining pipe installed in the pipeline to be repaired is basically impossible to remove except for excavation and pipe replacement. In other words, it is impossible to conduct sampling tests on the pressure resistance of the pipeline before actual installation. For pressure pipelines, this is a serious lack of safety supervision.

[0003] The trenchless repair technology of independent pressure-bearing flexible lining, represented by high-pressure resistant flexible circular woven composite pipe, adopts the direct equal-diameter insertion method. A flexible pressure-resistant lining pipe is directly dragged into the pressure pipeline to be repaired. Since the flexible pipe has no rigidity, it will collapse when the pipeline is subjected to negative pressure after repair. Groundwater and sand will enter between the inner lining pipe and the outer pipe through the original pipeline leakage point, resulting in a weakening of the flow capacity. Moreover, after the pressure is restored, the sand is difficult to be discharged, and this weakening of the flow capacity will continue. Summary of the Invention

[0004] The purpose of this invention is to provide a composite flexible pressure-resistant inner liner tube, its preparation method, and its application, in order to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A composite flexible pressure-resistant inner liner includes a supporting structure layer, which is bonded to the inner wall of a pressure-bearing structure layer with resin adhesive. The pressure-bearing structure layer is attached to the inner wall of the outer pipe to be repaired. The pressure-bearing structure layer is a single-sided coated round tube composed of a round tube and a film-coated adhesive extruded onto its outer wall. The supporting structure layer is composed of a single-sided coated felt hose and resin adhesive impregnated on it. The single-sided coated felt hose is bonded to the inner wall of the single-sided coated round tube with resin adhesive.

[0006] Furthermore, the single-sided coated circular tube is made of industrial filaments such as polyester or nylon.

[0007] Furthermore, the coating adhesive is made of polyurethane, and the resin adhesive is made of EP, VE, or UP resin.

[0008] A method for preparing a composite flexible pressure-resistant inner liner tube, used to prepare the composite flexible pressure-resistant inner liner tube described in any one of the above-mentioned methods, includes the following steps:

[0009] S1. Inject a sufficient amount of resin into the single-sided coated felt tube, press the resin evenly, and after it has soaked through the felt layer of the single-sided coated felt tube, stack the single-sided coated felt tubes neatly.

[0010] S2. Feed the resin-impregnated single-sided coated felt hose into the feed port of the casing equipment, pull it out from the reducer of the casing equipment, flip the front end of the single-sided coated felt hose, and fix it to the reducer with a clamp. The end of the single-sided coated round braided tube is also fixed to the reducer.

[0011] S3. Pressurize the casing equipment by pressurizing the air inlet pipe. Under the action of air pressure, the single-sided coated felt hose that has been impregnated with resin glue is gradually inserted into the single-sided coated round tube in an inverted manner. The single-sided coated felt hose is bonded to the inner wall of the single-sided coated round tube by resin glue to form a composite flexible pressure-resistant inner lining tube.

[0012] S4. Remove the composite flexible pressure-resistant inner liner from the reducer, fold it, and store or transport it under cold storage.

[0013] Furthermore, the casing equipment includes a housing, a differential pressure compensation riser is provided on the side of the housing, the lower end of the differential pressure compensation riser is connected to the inside of the housing, the upper end of the differential pressure compensation riser is provided with a feed inlet, a water level baffle is provided inside the housing, a roller is provided at the upper end of the water level baffle, the roller is rotatably connected to the inside of the housing, and a pressurized air inlet pipe and a pressure gauge are provided at the upper end of the housing.

[0014] Furthermore, the differential pressure compensation riser includes multiple intermediate pipes and a top pipe. The intermediate pipes are connected in series in pairs. The top pipe is fixed at the upper end of the uppermost intermediate pipe, and the lower end of the lowermost intermediate pipe is fixed to the shell. The upper end of the top pipe is provided with a feed inlet, and the top pipe is provided with a water level monitoring component and a roller limiting component.

[0015] Furthermore, the water level monitoring component includes a limiting post slidably connected inside the bracket, the bracket being fixed inside the jacking pipe, the limiting post being fixed to the upper end of the hollow float, a float rod one being fixed to the upper end of the hollow float, a scale one being provided on the outer surface of the float rod one, a float rod two being inserted inside the float rod one, a scale two being provided on the outer surface of the float rod two, a limiting cover being fixed to the upper end of the float rod two, and the limiting cover abutting against the upper end of the jacking pipe;

[0016] The roller limiting component includes an outer roller that rotates on the top tube. A rotating shaft is rotatably connected to the middle position of the outer roller. Two screws with opposite thread directions are fixed at both ends of the rotating shaft. Two slip rings are threadedly connected to the two screws. Each slip ring is provided with a baffle plate, which slides on the outer roller with its front end located outside the outer roller.

[0017] Furthermore, an inner pipe is fixed to the inner wall of the housing, the center line of the pressurized air inlet pipe coincides with that of the inner pipe, a plug is slidably connected inside the inner pipe, a spring is provided between the plug and the bottom of the inner pipe, a sealing ring is provided between the plug and the inner wall of the housing, and multiple elongated holes are provided on the side wall of the inner pipe.

[0018] The side of the housing is provided with a water outlet pipe, and a ball valve is rotatably connected inside the water outlet pipe.

[0019] Furthermore, a cover plate is rotatably connected to the housing. After the cover plate is closed on the housing, a sealing ring is provided between the cover plate and the housing. A handle is provided on the cover plate. A support column is fixed on the housing. A pressure plate is rotatably connected to the support column. The front end of the pressure plate abuts against the upper surface of the cover plate.

[0020] The housing is fixedly connected to the reducing joint via a flange.

[0021] Furthermore, the reducing joint includes a reducing joint body, which is fixedly connected to a flange. A threaded outer tube is threadedly connected to the end of the reducing joint body, and a limit ring is rotatably connected to the threaded outer tube. The limit ring is fixedly connected to a connecting column, and the connecting column is fixedly connected to an inner sliding plate. The inner sliding plate slides in a groove one on the reducing joint body. One end of the connecting column is rotatably connected to a rotating rod, and the other end of the rotating rod is rotatably connected to an arc-shaped support plate. The end of the arc-shaped support plate is fixedly connected to a sliding rod, which slides in a groove two on the reducing joint body. A rubber sleeve is provided on the reducing joint body, and one end of the rubber sleeve is bonded and fixed to the edge of the flange. At this point, the other end of the rubber sleeve passes through the clamp, and the end of the single-sided film-coated felt hose extends out of the reducer body from inside the shell. The end of the single-sided film-coated felt hose is flipped over and fitted onto the arc-shaped support plate. The front end of the single-sided film-coated felt hose is bent and fits against the slide rod. The end of the single-sided film-coated round tube is inserted into the outside of the end of the single-sided film-coated felt hose. The rubber sleeve covers the outside of the single-sided film-coated round tube. The rubber sleeve, the end of the single-sided film-coated round tube, and the flipped-out end of the single-sided film-coated felt hose are fixed to the arc-shaped support plate by the locking clamp. The side of the locking clamp presses the rubber sleeve and the front end of the flipped-out single-sided film-coated felt hose onto the slide rod.

[0022] The application of a composite flexible pressure-resistant liner prepared by any of the above-described methods in trenchless pipeline repair.

[0023] The advantages of this invention are:

[0024] After the outer wall of the single-sided coated circular hose is extruded with coated adhesive, it can withstand internal pressure of up to 30-50MPa when transporting media, basically covering the pressure range of industrial and civil pressure pipelines. The single-sided coated felt hose can independently bear all pressures except the internal pressure of the transported medium, such as the vacuum pressure inside the pipeline, the soil load on the pipeline, and the dynamic load.

[0025] Since the composite flexible pressure-resistant inner liner is produced in advance for backup, its pressure resistance can be sampled and tested before actual installation to prevent the situation where a composite flexible pressure-resistant inner liner with quality problems is installed in the outer pipe to be repaired, making it difficult to remove later.

[0026] After the resin adhesive impregnated on the outside of the single-sided membrane felt hose cures, it provides support strength for the single-sided membrane felt hose. The pipe will not be sucked down when it is under negative pressure, and groundwater and sand will not enter the space between the inner and outer pipes through the original pipe leakage points, thus preventing the flow capacity from weakening. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the composite flexible pressure-resistant inner liner tube structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the casing device structure of the present invention. Figure 1 ;

[0029] Figure 3 This is a schematic diagram of the casing device structure of the present invention. Figure 2 ;

[0030] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0031] Figure 5 for Figure 3 Enlarged view of a section at point B in the middle;

[0032] Figure 6 This is a schematic diagram of the casing device structure of the present invention. Figure 3 ;

[0033] Figure 7 for Figure 6 Enlarged view of a section at point C;

[0034] Figure 8 This is a schematic diagram of the casing device structure of the present invention. Figure 4 ;

[0035] Figure 9 for Figure 8 Enlarged view of a section at point D;

[0036] Figure 10 This is a schematic diagram of the variable diameter joint structure of the present invention. Figure 1 ;

[0037] Figure 11 This is a schematic diagram of the variable diameter joint structure of the present invention. Figure 2 ;

[0038] Figure 12 for Figure 11 Enlarged view of a section at point E in the middle;

[0039] Figure 13 for Figure 11 Enlarged view of a section at point F in the middle;

[0040] Figure 14 This is a schematic diagram of the sleeve operation of the present invention;

[0041] Figure 15 for Figure 14 Enlarged view of a section at point G in the middle;

[0042] Explanation of markings in the diagram:

[0043] 1. External pipe to be repaired; 2. Pressure-bearing structural layer; 3. Supporting structural layer; 4. Single-sided membrane-coated felt hose; 5. Single-sided membrane-coated round braided tube; 6. Shell; 7. Middle section pipe; 8. Jacking pipe; 9. Pressurized air inlet pipe; 10. Pressure gauge; 11. Flange; 12. Reducer; 1201. Reducer body; 1202. Threaded outer pipe; 1203. Limiting ring; 1204. Connecting column; 1205. Inner sliding plate; 1206. Slide groove one; 1207. Rotating rod; 1208. Arc-shaped support plate; 1209. Slide rod; 1210. Slide groove two. 1211 Rubber sleeve; 13 Water level baffle; 14 Roller; 15 Cover plate; 16 Sealing ring 1; 17 Handle; 18 Support column; 19 Tightening plate; 20 Sealing ring 2; 21 Inner pipe; 22 Plug; 23 Long hole; 24 Spring 1; 25 Outer roller; 26 Rotating shaft; 27 Slip ring; 28 Bracket; 29 Limiting column; 30 Hollow float; 31 Float rod 1; 32 Float rod 2; Limiting cover; 33 Outlet pipe; 34 Ball valve; 35 Feed inlet; 36 Clamp; 37 Screw; 38 Baffle plate; 39. Detailed Implementation

[0044] 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 only some, not all, of the embodiments of the present invention. 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.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 the 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Example 1

[0047] like Figures 1-15 As shown, a composite flexible pressure-resistant inner liner includes a support structure layer 3, which is bonded to the inner wall of a pressure-bearing structure layer 2 with resin adhesive. The pressure-bearing structure layer 2 is attached to the inner wall of the outer pipe 1 to be repaired. The pressure-bearing structure layer 2 is a single-sided coated round tube 5 composed of a round tube and a coated adhesive extruded from its outer wall. The support structure layer 3 is composed of a single-sided coated felt hose 4 and resin adhesive impregnated on it. The single-sided coated felt hose 4 is bonded to the inner wall of the single-sided coated round tube 5 with resin adhesive.

[0048] The working principle of the above technical solution: After the outer wall of the single-sided coated circular hose 5 is extruded and formed with coated adhesive, it can withstand a pressure of up to 30-50MPa when transporting the medium, which basically covers the pressure range of industrial and civil pressure pipelines. The single-sided coated felt hose 4 can independently bear all pressures except the internal pressure of the transported medium, such as the vacuum pressure inside the pipeline, the soil load on the pipeline, and the dynamic load.

[0049] Since the composite flexible pressure-resistant inner liner is produced in advance for backup, its pressure resistance can be sampled and tested before actual installation to prevent the situation where a composite flexible pressure-resistant inner liner with quality problems is installed in the outer pipe to be repaired, making it difficult to remove later.

[0050] After the resin adhesive impregnated on the outside of the single-sided membrane felt hose cures, it provides support strength for the single-sided membrane felt hose. The pipe will not be sucked down when it is under negative pressure, and groundwater and sand will not enter the space between the inner and outer pipes through the original pipe leakage points, thus preventing the flow capacity from weakening.

[0051] Example 2

[0052] like Figures 1-15 As shown, the single-sided coated circular tube 5 is made of industrial filaments such as polyester or nylon;

[0053] The coating adhesive is made of polyurethane, and the resin adhesive is made of EP, VE, or UP resin.

[0054] The working principle of the above technical solution is as follows: the single-sided coated circular tube 5 is made of industrial filaments such as polyester or nylon to ensure its structural strength, and the resin material is EP, VE or UP resin, which can make the temperature, corrosiveness and water immersion of the conveyed medium meet the requirements.

[0055] Example 3

[0056] like Figures 1-15 As shown, a method for preparing a composite flexible pressure-resistant liner tube, used to prepare the composite flexible pressure-resistant liner tube described in any of the above-mentioned embodiments, includes the following steps:

[0057] S1. Inject a sufficient amount of resin into the single-sided coated felt tube 4, press the resin evenly, and after it has soaked through the felt layer of the single-sided coated felt tube 4, stack the single-sided coated felt tube 4 neatly.

[0058] S2. Feed the resin-impregnated single-sided coated felt hose 4 into the feed port 36 of the casing equipment, pull it out from the reducer 12 of the casing equipment, flip the front end of the single-sided coated felt hose 4, and fix it to the reducer 12 with the clamp 37. The end of the single-sided coated round braided tube 5 is also fixed to the reducer 12.

[0059] S3. Pressurize the casing equipment by pressurizing the air inlet pipe 9. Under the action of air pressure, the single-sided coated felt hose 4, which has been impregnated with resin, is gradually inserted into the single-sided coated round tube 5 in a flipping manner. The single-sided coated felt hose 4 is bonded to the inner wall of the single-sided coated round tube 5 by the resin to form a composite flexible pressure-resistant inner lining tube.

[0060] S4. Remove the composite flexible pressure-resistant inner liner from the reducer 12, fold it, and store or transport it under cold storage.

[0061] The working principle of the above technical solution is as follows: Sufficient resin is injected into the single-sided coated felt hose 4. The resin is pressed evenly and thoroughly impregnates the felt layer of the single-sided coated felt hose 4. The single-sided coated felt hoses 4 are then stacked neatly. A preset amount of water is injected into the casing equipment through the inlet 36. The resin-impregnated single-sided coated felt hose 4 is then fed into the casing equipment through the inlet 36. The single-sided coated felt hose 4 passes through the water inside the casing equipment and is pulled out through the reducing joint 12 of the casing equipment, then flipped over. The front end of the single-sided coated felt hose 4 is fixed to the reducing joint 12 by clamp 37. The end of the single-sided coated round tube 5 is also fixed to the reducing joint 12. Air is injected into the casing equipment through the pressurized air inlet pipe 9, which increases the air pressure inside the casing equipment. Under the action of air pressure, the resin-impregnated single-sided coated felt hose 4 is gradually inserted into the single-sided coated round tube 5 in a flipped manner. The single-sided coated felt hose 4 is bonded to the inner wall of the single-sided coated round tube 5 by resin adhesive to form a composite flexible pressure-resistant inner lining tube.

[0062] The water inside the casing equipment serves to expel air from the single-sided coated felt hose 4, which has been impregnated with resin, and to further press the resin impregnated in the single-sided coated felt hose 4 evenly. The single-sided coated felt hose 4, which has been impregnated with resin, moves forward in the water, reducing friction.

[0063] Example 4

[0064] like Figures 1-15As shown, the casing equipment includes a housing 6, a differential pressure compensation riser is provided on the side of the housing 6, the lower end of the differential pressure compensation riser is connected to the inside of the housing 6, the upper end of the differential pressure compensation riser is provided with a feed inlet 36, a water level baffle 13 is provided inside the housing 6, a roller 14 is provided at the upper end of the water level baffle 13, the roller 14 is rotatably connected to the inside of the housing 6, and a pressurized air inlet pipe 9 and a pressure gauge 10 are provided at the upper end of the housing 6;

[0065] The differential pressure compensation riser includes multiple intermediate pipes 7 and a top pipe 8. The multiple intermediate pipes 7 are connected in series in pairs. The top pipe 8 is fixed at the upper end of the uppermost intermediate pipe 7, and the lower end of the lowermost intermediate pipe 7 is fixed on the shell 6. The upper end of the top pipe 8 is provided with a feed inlet 36. The top pipe 8 is provided with a water level monitoring component and a roller limiting component.

[0066] The working principle of the above technical solution is as follows: After water is injected into the shell 6 through the inlet 36, due to the principle of communicating vessels, the water level in the shell 6 is level with the water level in the middle section pipe 7. The water level should not be higher than the upper end of the water level baffle 13. When the single-sided coated felt hose 4 with the end flipped over is fixed at the reducer 12 by the clamp 37, the chamber on the upper side of the water level in the shell 6 is relatively closed. When the shell 6 is pressurized by the pressurized air inlet pipe 9, the water level in the shell 6 is squeezed down under the action of atmospheric pressure, and the water level in the middle section pipe 7 rises. Therefore, in the middle section pipe 7, a longer water column can contact the single-sided coated felt hose 4, and the resin glue impregnated in the single-sided coated felt hose 4 can be further pressed evenly by water.

[0067] The air pressure inside the housing 6 can be monitored by pressure gauge 10;

[0068] The required pressure for connecting single-sided coated felt hose 4 and single-sided coated round braided hose 5 of different sizes and models is not the same. Therefore, the number of intermediate pipes 7 can be appropriately increased or decreased to adjust the height of the pressure differential compensation riser, thereby adapting to different sleeve requirements.

[0069] The function of the water level baffle 13 is to prevent water in the housing 6 from entering the reducer 12 and then entering the single-sided coated round tube 5, thereby affecting the connection between the single-sided coated felt hose 4 and the single-sided coated round tube 5.

[0070] The single-sided coated felt hose 4 moves through the roller 14 and enters the reducing joint 12, reducing the friction of the single-sided coated felt hose 4 during the forward movement, and facilitating connection with the single-sided coated round braided tube 5.

[0071] The water level monitoring component can monitor whether the water level in the differential pressure compensation riser has reached the warning water level height, preventing the water in the differential pressure compensation riser from overflowing due to excessive water level.

[0072] The single-sided coated felt hose 4 enters the housing 6 through the feed port 36 via the roller limiting component. The function of the roller limiting component is to reduce the friction between the single-sided coated felt hose 4 and the upper edge of the top tube 8. In addition, the roller limiting component can be adjusted to adapt to single-sided coated felt hoses 4 of different diameters, so that the single-sided coated felt hose 4 always enters the housing 6 in the middle position of the top tube 8, preventing it from deviating and hitting the inner wall of the housing 6, increasing the friction, and thus affecting the connection between the single-sided coated felt hose 4 and the single-sided coated round braided tube 5.

[0073] Example 5

[0074] like Figures 1-15 As shown, the water level monitoring component includes a limiting post 29 slidably connected inside a bracket 28, the bracket 28 being fixed inside a jacking pipe 8, the limiting post 29 being fixed to the upper end of a hollow float 30, a float rod 31 being fixed to the upper end of the hollow float 30, a scale 1 being provided on the outer surface of the float rod 31, a float rod 32 being inserted inside the float rod 31, a scale 2 being provided on the outer surface of the float rod 32, and a limiting cover 33 being fixed to the upper end of the float rod 32, the limiting cover 33 abutting against the upper end of the jacking pipe 8;

[0075] The working principle of the above technical solution is as follows: When the water level in the middle section pipe 7 and the jacking pipe 8 is higher than the hollow float 30, the buoyancy of the water causes the hollow float 30 to rise, which causes the support 28 and the limiting column 29 to slide. The limiting column 29, the hollow float 30, the float rod 1 31, the float rod 2 32 and the limiting cover 33 all rise. The limiting cover 33 is higher than the upper end of the jacking pipe 8 to remind the operator to stop inflating and pressurizing the shell 6.

[0076] There is significant friction between float 1 (31) and float 2 (32). Under normal conditions, when no one touches float 1 (31) and float 2 (32), they will not slip. The height of the hollow buoy 30 is the warning water level. The warning water level can be obtained by combining scale 1 and scale 2. Manually inserting or removing float 1 (31) and float 2 (32) changes the position of the hollow buoy 30, thus changing the warning water level. This can be adjusted according to actual usage.

[0077] Example 6

[0078] like Figures 1-15 As shown, the roller limiting component includes an outer roller 25, which rotates on the top tube 8. A rotating shaft 26 is rotatably connected to the middle position of the outer roller 25. Two screws 38 with opposite thread directions are fixed at both ends of the rotating shaft 26. Two slip rings 27 are threadedly connected to the two screws 38 respectively. Each slip ring 27 is provided with a baffle 39. The baffle 39 slides on the outer roller 25, and its front end is located outside the outer roller 25.

[0079] The working principle of the above technical solution is as follows: the end of the single-sided coated felt hose 4 is bypassed by the outer roller 25 and sent into the housing 6. The outer roller 25 rotates with the top tube 8, which reduces the friction force of the single-sided coated felt hose 4, making it easier to connect the single-sided coated felt hose 4 and the single-sided coated round tube 5. At the same time, it does not require greater air pressure to squeeze the single-sided coated felt hose 4 into the single-sided coated round tube 5, thus saving energy.

[0080] Control the outer roller 25 to prevent it from rotating, rotate the screw 38 to rotate, drive the two screws 38 and the rotating shaft 26 to rotate, drive the two slip rings 27 to move together or away, thereby changing the distance between the two sets of baffles 39. The two sets of baffles 39 block both sides of the single-sided coated felt hose 4, so that the single-sided coated felt hose 4 always enters the housing 6 in the middle position of the top tube 8, preventing it from deviating and hitting the inner wall of the housing 6, increasing friction, and thus affecting the connection between the single-sided coated felt hose 4 and the single-sided coated round braided tube 5;

[0081] By adjusting the distance between the two sets of baffles 39, single-sided coated felt hoses 4 with different apertures can be adapted.

[0082] Example 7

[0083] like Figures 1-15 As shown, an inner tube 21 is fixed to the inner wall of the housing 6. The pressurized air inlet pipe 9 coincides with the center line of the inner tube 21. A plug 22 is slidably connected inside the inner tube 21. A spring 24 is provided between the plug 22 and the bottom of the inner tube 21. A sealing ring 20 is provided between the plug 22 and the inner wall of the housing 6. Multiple elongated holes 23 are provided on the side wall of the inner tube 21.

[0084] The side of the housing 6 is provided with a water outlet pipe 34, and a ball valve 35 is rotatably connected inside the water outlet pipe 34.

[0085] The working principle of the above technical solution is as follows: When the pressurized air inlet pipe 9 pressurizes the housing 6, the gas compresses the plug 22 and moves it downward in the inner pipe 21, which in turn compresses the spring 24. After the plug 22 moves down a certain height, the gas enters the housing 6 through the elongated hole 23. When the pressurized air inlet pipe 9 is accidentally separated from the air filling device, under the combined action of the air pressure inside the housing 6 and the elastic force of the spring 24, the plug 22 moves upward rapidly and presses against the sealing ring 20, sealing the elongated hole 23 and preventing the gas inside the housing 6 from overflowing and causing energy loss.

[0086] When it is necessary to replace the water in the housing 6, open the ball valve 35 in the outlet pipe 34, and the water in the housing 6 will flow out through the outlet pipe 34.

[0087] Example 8

[0088] like Figures 1-15As shown, a cover plate 15 is rotatably connected to the housing 6. After the cover plate 15 is closed on the housing 6, a sealing ring 16 is provided between the cover plate 15 and the housing 6. A handle 17 is provided on the cover plate 15. A support column 18 is fixed on the housing 6. A pressure plate 19 is rotatably connected to the support column 18. The front end of the pressure plate 19 abuts against the upper surface of the cover plate 15.

[0089] The housing 6 is fixedly connected to the reducing joint 12 via flange 11;

[0090] The working principle of the above technical solution is as follows: Rotate the pressure plate 19 so that the front end of the pressure plate 19 separates from the cover plate 15. Pull the handle 17 so that the cover plate 15 and the housing 6 can be rotated open. The inside can be operated through the opening on the housing 6. Especially in the early stage, when the single-sided coated felt hose 4 passes through the housing 6, the cover plate 15 can be opened to pull the single-sided coated felt hose 4 through.

[0091] A sealing ring 16 is provided between the cover plate 15 and the housing 6 to increase the sealing between the two and prevent pressure loss when the housing 6 is inflated and pressurized after the cover plate 15 and the housing 6 are fastened together.

[0092] Example 9

[0093] like Figures 1-15As shown, the reducing joint 12 includes a reducing joint body 1201, which is fixedly connected to a flange 11. A threaded outer tube 1202 is threadedly connected to the end of the reducing joint body 1201. A limit ring 1203 is rotatably connected to the threaded outer tube 1202. The limit ring 1203 is fixedly connected to a connecting post 1204. The connecting post 1204 is fixedly connected to an inner sliding plate 1205. The inner sliding plate 1205 slides in a first sliding groove 1206 on the reducing joint body 1201. One end of the connecting post 1204 is rotatably connected to a rotating rod 1207. The other end of the rotating rod 1207 is rotatably connected to an arc-shaped support plate 1208. The end of the arc-shaped support plate 1208 is fixedly connected to a sliding rod 1209. The sliding rod 1209 slides in a second sliding groove 1210 on the reducing joint body 1201. A rubber sleeve is provided on the reducing joint body 1201. 1211, one end of the rubber sleeve 1211 is glued and fixed to the edge of the flange 11, and the other end of the rubber sleeve 1211 passes through the clamp 37. The end of the single-sided film-coated felt hose 4 passes through the reducer body 1201 from the inside of the housing 6. The end of the single-sided film-coated felt hose 4 is turned over and sleeved on the arc support plate 1208. The front end of the single-sided film-coated felt hose 4 is bent and fits against the slide rod 1209. The end of the single-sided film-coated round tube 5 is inserted into the outside of the end of the single-sided film-coated felt hose 4. The rubber sleeve 1211 covers the outside of the single-sided film-coated round tube 5. The rubber sleeve 1211, the end of the single-sided film-coated round tube 5 and the turned-out end of the single-sided film-coated felt hose 4 are fixed on the arc support plate 1208 by the locking clamp 37. The side of the locking clamp 37 squeezes the rubber sleeve 1211 and the turned-out end of the single-sided film-coated felt hose 4 onto the slide rod 1209.

[0094] The working principle of the above technical solution is as follows: After the end of the single-sided coated felt hose 4 passes through the reducer body 1201 inside the shell 6, the end of the single-sided coated felt hose 4 is turned over and sleeved on the arc support plate 1208. The front end of the single-sided coated felt hose 4 is bent and fits against the slide rod 1209. The end of the single-sided coated round tube 5 is inserted into the outside of the end of the single-sided coated felt hose 4. The rubber sleeve 1211 covers the outside of the single-sided coated round tube 5. The rubber sleeve 1211, the end of the single-sided coated round tube 5 and the turned-out end of the single-sided coated felt hose 4 are fixed on the arc support plate 1208 by the locking clamp 37. The side of the locking clamp 37 squeezes the rubber sleeve 1211 and the turned-out front end of the single-sided coated felt hose 4 onto the slide rod 1209 to enhance the sealing and prevent gas leakage.

[0095] Rotating the threaded outer tube 1202 causes it to move inward or outward on the reducing connector body 1201, which in turn moves the limiting ring 1203 along with the threaded outer tube 1202. This causes the four connecting posts 1204 and the four inner sliding plates 1205 to slide on the reducing connector body 1201 through the four sliding grooves 1206, thereby causing the four sets of rotating rods 1207 to rotate. This causes the four arc-shaped support plates 1208 to move together or away, and the four sliding rods 1209 to slide in the four sliding grooves 1210. After the four arc-shaped support plates 1208 move, their diameter changes, thus adapting to the connection between single-sided coated felt hoses 4 and single-sided coated round braided tubes 5 of different diameters, resulting in strong adaptability.

[0096] Example 10

[0097] like Figures 1-15 As shown, a composite flexible pressure-resistant liner prepared by any of the above-described methods is used in trenchless pipeline repair.

[0098] The working principle of the above technical solution: Trenchless pipeline repair technology refers to the method of using the original pipeline location resources, such as inspection wells and valve wells, as the operating space, without excavation or with minimal excavation, and using relevant technologies to install a new pipeline lining inside the existing pipeline, so as to regenerate the pipeline and extend its service life. It is widely used in pipeline renewal.

[0099] Currently, mainstream trenchless pipeline repair technologies, such as CIPP, FIPP, mechanical spiral winding, polymer mortar spraying, short pipe replacement, and interlocking, are widely used in drainage gravity flow pipeline renewal and repair projects, exceeding the application rate of excavation and pipeline replacement. They are also gradually being promoted in water supply, gas, and heating pipeline renewal projects, but due to technical limitations, the promotion speed is slower than that of gravity drainage.

[0100] This composite flexible pressure-resistant inner liner is used in trenchless pipeline repair to repair existing pipelines, enabling them to regenerate and thus extending their service life.

[0101] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for preparing a composite flexible pressure-resistant inner liner tube, characterized in that, Includes the following steps: S1. Inject a sufficient amount of resin glue into the single-sided coated felt tube (4), press the resin glue evenly, and after it has soaked through the felt layer of the single-sided coated felt tube (4), stack the single-sided coated felt tube (4) neatly. S2. Inject a preset amount of water into the casing equipment from the feed port (36) of the casing equipment, feed the resin-impregnated single-sided coated felt hose (4) into the casing equipment from the feed port (36), pull it out from the reducer joint (12) of the casing equipment, flip the front end of the single-sided coated felt hose (4), and fix it to the reducer joint (12) with the clamp (37). The end of the single-sided coated round braided tube (5) is also fixed to the reducer joint (12). S3. Pressurize the casing equipment by pressurizing the air inlet pipe (9). Under the action of air pressure, the single-sided coated felt hose (4) which has been impregnated with resin glue is gradually inserted into the single-sided coated round tube (5) in a flipping manner. The single-sided coated felt hose (4) is bonded to the inner wall of the single-sided coated round tube (5) by resin glue to form a composite flexible pressure-resistant inner lining tube. S4. Remove the composite flexible pressure-resistant inner liner from the reducing joint (12), fold it, and store or transport it under cold storage; The casing equipment includes a housing (6), a differential pressure compensation riser is provided on the side of the housing (6), the lower end of the differential pressure compensation riser is connected to the inside of the housing (6), the upper end of the differential pressure compensation riser is provided with a feed inlet (36), a water level baffle (13) is provided inside the housing (6), a roller (14) is provided at the upper end of the water level baffle (13), the roller (14) is rotatably connected inside the housing (6), and a pressurized air inlet pipe (9) and a pressure gauge (10) are provided at the upper end of the housing (6). The differential pressure compensation riser includes multiple intermediate pipes (7) and a jacking pipe (8). The multiple intermediate pipes (7) are connected in series in pairs. The jacking pipe (8) is fixed at the upper end of the uppermost intermediate pipe (7), and the lower end of the lowermost intermediate pipe (7) is fixed on the shell (6). The upper end of the jacking pipe (8) is provided with a feed inlet (36). The jacking pipe (8) is provided with a water level monitoring component and a roller limiting component. The housing (6) is fixedly connected to the reducing joint (12) via a flange (11); The reducing joint (12) includes a reducing joint body (1201), which is fixedly connected to a flange (11). A threaded outer tube (1202) is threadedly connected to the end of the reducing joint body (1201). A limit ring (1203) is rotatably connected to the threaded outer tube (1202). The limit ring (1203) is fixedly connected to a connecting column (1204). The connecting column (1204) is fixedly connected to an inner sliding plate (1205). The inner sliding plate (1205) slides in a groove (1206) on the reducing joint body (1201). The connecting column (1204) is rotatably connected to one end of the rotating rod (1207), and the other end of the rotating rod (1207) is rotatably connected to the arc-shaped support plate (1208). The end of the arc-shaped support plate (1208) is fixedly connected to the slide rod (1209). The slide rod (1209) slides in the second slide groove (1210) on the reducing joint body (1201). The reducing joint body (1201) is provided with a rubber sleeve (1211). One end of the rubber sleeve (1211) is bonded and fixed to the edge of the flange (11), and the other end of the rubber sleeve (1211) passes through the clamp (37).

2. The method for preparing a composite flexible pressure-resistant inner liner tube according to claim 1, characterized in that, The water level monitoring component includes a limiting column (29) slidably connected inside a bracket (28), the bracket (28) fixed inside a jacking pipe (8), the limiting column (29) fixed at the upper end of a hollow float (30), a float rod (31) fixed at the upper end of the hollow float (30), a scale (1) provided on the outer surface of the float rod (31), a float rod (32) inserted inside the float rod (31), a scale (2) provided on the outer surface of the float rod (32), a limiting cover (33) fixed at the upper end of the float rod (32), and the limiting cover (33) abutting against the upper end of the jacking pipe (8); The roller limiting component includes an outer roller (25), which rotates on the top pipe (8). A rotating shaft (26) is rotatably connected to the middle position of the outer roller (25). Two screws (38) with opposite thread directions are fixed at both ends of the rotating shaft (26). Two slip rings (27) are threadedly connected to the two screws (38). Each slip ring (27) is provided with a baffle (39). The baffle (39) slides on the outer roller (25), and its front end is located outside the outer roller (25).

3. The method for preparing a composite flexible pressure-resistant inner liner tube according to claim 2, characterized in that, The inner wall of the housing (6) is fixed with an inner pipe (21). The center line of the pressurized air inlet pipe (9) coincides with that of the inner pipe (21). A plug (22) is slidably connected inside the inner pipe (21). A spring (24) is provided between the plug (22) and the bottom of the inner pipe (21). A sealing ring (20) is provided between the plug (22) and the inner wall of the housing (6). Multiple elongated holes (23) are provided on the side wall of the inner pipe (21). The housing (6) has a water outlet pipe (34) on its side, and a ball valve (35) is rotatably connected inside the water outlet pipe (34).

4. The method for preparing a composite flexible pressure-resistant inner liner tube according to claim 3, characterized in that, A cover plate (15) is rotatably connected to the housing (6). After the cover plate (15) is closed on the housing (6), a sealing ring (16) is provided between the cover plate (15) and the housing (6). A handle (17) is provided on the cover plate (15). A support column (18) is fixed on the housing (6). A pressure plate (19) is rotatably connected to the support column (18). The front end of the pressure plate (19) abuts against the upper surface of the cover plate (15).

5. The application of a composite flexible pressure-resistant liner prepared by the method of any one of claims 1-4 in trenchless pipeline repair.

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