Composite flexible pressure-resistant lining pipe as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of pipeline repair, and particularly relates to a composite flexible pressure-resistant lining pipe and a preparation method and application thereof.The composite flexible pressure-resistant lining pipe comprises a supporting structure layer, the supporting structure layer is bonded to the inner wall of a pressure-bearing structure layer through resin glue, and the pressure-bearing structure layer is attached to the inner wall of a to-be-repaired outer pipeline; the pressure-bearing structure layer is a single-face film-coated circular knitting pipe composed of a circular knitting pipe and a film-coated adhesive formed by extruding the outer wall of the circular knitting pipe, the supporting structure layer is composed of a single-face film-coated felt hose and a resin adhesive impregnated on the single-face film-coated felt hose, and the single-face film-coated felt hose is bonded on the inner wall of the single-face film-coated circular knitting pipe through the resin adhesive. After the laminated adhesive is extruded and formed on the outer wall of the single-sided laminated circular knitting pipe, when the single-sided laminated circular knitting pipe is used for conveying a medium, the internal pressure of the single-sided laminated circular knitting pipe can reach 30-50MPa at most, the single-sided laminated circular knitting pipe basically covers pressure-bearing intervals of pressure pipelines in the industrial and civil fields, and the single-sided laminated felt hose can independently bear all pressures except for the internal pressure of the conveyed medium, such as vacuum pressure in the pipelines, soil load on the pipes, dynamic load and the like; therefore, the service life of the pipeline is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline repair, and in particular relates to a composite flexible pressure-resistant liner pipe and a preparation method and application thereof. Background Art

[0002] Existing trenchless repairs for pipelines can be divided into two modes: independent pressure-bearing and composite pressure-bearing. Existing independent pressure-bearing rigid lining repair technologies represented by CIPP (curing in place) are all on-site curing reaction (or on-site assembly) technologies, that is, pipe forming and engineering implementation are completed simultaneously. If quality defects occur, there is basically no possibility of removing the lining pipe installed in the pipeline to be repaired except for excavation and replacement of the pipe. In other words, it is impossible to sample and test the pressure resistance of the pipeline before actual installation. For pressure pipelines, this is a serious lack of safety supervision;

[0003] The independent pressure-bearing flexible liner trenchless repair technology represented by high-pressure resistant flexible circular woven composite pipes adopts the direct equal-diameter insertion method to directly drag a flexible pressure-resistant liner into the pressure pipe to be repaired. Since the flexible pipe does not have rigidity, the pipe will be sucked out when it is under negative pressure after the repair. Groundwater and sand will enter between the inner liner and the outer pipe through the leakage point of the original pipe, resulting in a weakening of the flow capacity. After the pressure is restored, the sand is difficult to discharge, and the weakened flow capacity will continue to exist. Summary of the invention

[0004] The purpose of the present invention is to provide a composite flexible pressure-resistant liner pipe and a preparation method and application thereof to solve the problems in the prior art. The specific technical scheme is as follows:

[0005] A composite flexible pressure-resistant liner pipe comprises a supporting structure layer, which is bonded to the inner wall of a pressure-bearing structure layer by resin glue, and the pressure-bearing structure layer is adhered to the inner wall of an outer pipe to be repaired. The pressure-bearing structure layer is a single-sided coated circular woven tube composed of a circular woven tube and a coated glue extruded on its outer wall, and the supporting structure layer is composed of a single-sided coated felt hose and resin glue impregnated thereon, and the single-sided coated felt hose is bonded to the inner wall of the single-sided coated circular woven tube by resin glue.

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

[0007] Furthermore, the laminating adhesive material is polyurethane, and the resin adhesive material is EP, VE or UP resin.

[0008] A method for preparing a composite flexible pressure-resistant inner liner pipe is used to prepare a composite flexible pressure-resistant inner liner pipe as described in any one of the above items, comprising the following steps:

[0009] S1. Pour a sufficient amount of resin glue into the single-sided film-coated felt hose, press the resin glue evenly, and soak the felt layer of the single-sided film-coated felt hose, and then stack the single-sided film-coated felt hose neatly;

[0010] S2. The single-sided coated felt hose impregnated with resin glue is fed from the feed port of the casing device, pulled out from the reducer of the casing device, the front end of the single-sided coated felt hose is turned over, and it is fixed to the reducer by a clamp, and the end of the single-sided coated round woven tube is also fixed to the reducer;

[0011] S3. Inflate and pressurize the casing device through the pressurized air inlet pipe. The single-sided film-coated felt hose impregnated with resin glue is gradually inserted into the single-sided film-coated round woven tube in an overturned form under the action of air pressure. The single-sided film-coated felt hose is bonded to the inner wall of the single-sided film-coated round woven tube through the resin glue to form a composite flexible pressure-resistant inner liner tube;

[0012] S4. Remove the composite flexible pressure-resistant liner pipe from the reducer, fold it, and store or transport it in a cold place.

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

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

[0015] Further, the water level monitoring component includes a limit column slidably connected in the bracket, the bracket is fixed in the top pipe, the limit column is fixed at the upper end of the hollow float, a float rod 1 is fixed at the upper end of the hollow float, a scale 1 is provided on the outer surface of the float rod 1, a float rod 2 is inserted in the float rod 1, a scale 2 is provided on the outer surface of the float rod 2, a limit cover is fixed at the upper end of the float rod 2, and the limit cover is against the upper end of the top pipe;

[0016] The roller limiting component includes an outer roller, which rotates on the top pipe. 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. Both slip rings are provided with baffles, which slide on the roller and have their front ends located outside the outer roller.

[0017] Furthermore, an inner tube is fixed to the inner wall of the shell, the center line of the pressurized air intake pipe coincides with the center line of the inner tube, a blocking column is slidably connected to the inner tube, a spring is provided between the blocking column and the bottom of the inner tube, a sealing ring is provided between the blocking column and the inner wall of the shell, and a plurality of long holes are provided on the side wall of the inner tube;

[0018] A water outlet pipe is arranged on the side of the shell body, and a ball valve is rotatably connected in the water outlet pipe.

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

[0020] The shell is fixedly connected to the reducer through a flange.

[0021] Further, the reducer includes a reducer body, the reducer body is fixedly connected to the flange, the end of the reducer body is threadedly connected to a threaded outer tube, the threaded outer tube is rotatably connected to a limit ring, the limit ring is fixedly connected to a connecting column, the connecting column is fixedly connected to an inner slide, the inner slide slides in a slide groove 1 on the reducer body, the connecting column is rotatably connected to one end of a rotating rod, 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, the sliding rod slides in a slide groove 2 on the reducer body, and a rubber sleeve is provided on the reducer body, one end of the rubber sleeve is bonded and fixed to the edge of the flange The other end of the rubber sleeve passes through the clamp, and the end of the single-sided film-coated felt hose passes through the reducer body from the inside of the shell. The end of the single-sided film-coated felt hose is turned over and sleeved on the arc-shaped support plate. The front end of the single-sided film-coated felt hose is bent and fits the slide bar, and the end of the single-sided film-coated circular woven 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 circular woven tube, and the rubber sleeve, the end of the single-sided film-coated circular woven tube and the outward-turned single-sided film-coated felt hose end are fixed on the arc-shaped support plate by locking the clamp, and the side of the locking clamp squeezes the rubber sleeve and the outward-turned front end of the single-sided film-coated felt hose onto the slide bar.

[0022] A composite flexible pressure-resistant liner pipe prepared by the method for preparing a composite flexible pressure-resistant liner pipe as described in any one of the above items is used in trenchless repair of pipelines.

[0023] The advantages of the present invention are:

[0024] The outer wall of the single-sided coated circular woven tube is extruded with a coated rubber, so that when conveying the medium, its internal pressure can reach up to 30-50MPa, basically covering the pressure range of pressure pipelines in industrial and civil fields. The single-sided coated felt hose can independently bear all pressures except the internal pressure of the conveying medium, such as the vacuum pressure in the pipeline, the soil load on the pipe, and the dynamic load;

[0025] Since the composite flexible pressure-resistant inner liner is produced in advance for backup, the composite flexible pressure-resistant inner liner can be sampled and tested for its pressure resistance before actual installation to prevent the composite flexible pressure-resistant inner liner with quality problems from being difficult to remove later after it is installed in the external pipeline to be repaired;

[0026] After the resin glue impregnated on the outside of the single-sided coated felt hose is cured, it provides supporting strength for the single-sided coated felt hose. The pipeline will not be sucked flat when it is under negative pressure, and groundwater and sand will not enter between the inner lining pipe and the outer pipe through the leakage point of the original pipeline, resulting in a weakening of the flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 The structure of the casing device of the present invention is shown in FIG. Figure 1 ;

[0029] Figure 3 The structure of the casing device of the present invention is shown in FIG. Figure 2 ;

[0030] Figure 4 for Figure 3 A partial enlarged view of the middle part;

[0031] Figure 5 for Figure 3 A partial enlarged view of point B in the middle;

[0032] Figure 6 The structure of the casing device of the present invention is shown in FIG. Figure 3 ;

[0033] Figure 7 for Figure 6 A partial enlarged view of point C in the middle;

[0034] Figure 8 The structure of the casing device of the present invention is shown in FIG. Figure 4 ;

[0035] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle;

[0036] Fig.10 The reducer structure of the present invention is shown in FIG. Figure 1 ;

[0037] Fig.11 The reducer structure of the present invention is shown in FIG. Figure 2 ;

[0038] Fig.12 for Fig.11 A partial enlarged view of point E in the middle;

[0039] Fig.13 for Fig.11 A partial enlarged view of point F in the middle;

[0040] Fig.14 It is a schematic diagram of the working of the casing of the present invention;

[0041] Fig.15 for Fig.14 A partial enlarged view of the G in the middle;

[0042] Description of the markings in the figure:

[0043] External pipeline to be repaired 1; pressure-bearing structure layer 2; supporting structure layer 3; single-sided coated felt hose 4; single-sided coated round woven tube 5; shell 6; middle tube 7; top tube 8; pressurized air intake pipe 9; pressure gauge 10; flange 11; reducer 12; reducer body 1201; threaded outer tube 1202; limit ring 1203; connecting column 1204; inner slide plate 1205; slide groove 1 1206; rotating rod 1207; arc support plate 1208; slide rod 1209; slide groove 2 1210; Rubber sleeve 1211; water level baffle 13; roller 14; cover 15; sealing ring 16; handle 17; support column 18; pressure plate 19; sealing ring 20; internal pipe 21; blocking column 22; long hole 23; spring 1 24; external roller 25; rotating shaft 26; slip ring 27; bracket 28; limiting column 29; hollow floating ball 30; floating rod 1 31; floating rod 2 32; limiting cover 33; water outlet pipe 34; ball valve 35; feed port 36; clamp 37; screw 38; baffle 39. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] Embodiment 1

[0047] like Figure 1-Figure 15 As shown, a composite flexible pressure-resistant inner liner pipe includes a supporting structure layer 3, which is bonded to the inner wall of a pressure-bearing structure layer 2 by resin glue, and the pressure-bearing structure layer 2 is attached to the inner wall of an outer pipe 1 to be repaired, and the pressure-bearing structure layer 2 is a round woven tube and a single-sided coated round woven tube 5 composed of a coated glue extruded from the outer wall thereof, and the supporting structure layer 3 is composed of a single-sided coated felt hose 4 and resin glue impregnated thereon, and the single-sided coated felt hose 4 is bonded to the inner wall of the single-sided coated round woven tube 5 by resin glue;

[0048] The working principle of the above technical solution: after the outer wall of the single-sided coated circular woven tube 5 is extruded and coated with glue, when conveying the medium, its internal pressure can reach up to 30-50MPa, basically covering the pressure range of industrial and civil pressure pipelines, and the single-sided coated felt hose 4 can independently bear all pressures except the internal pressure of the conveying medium, such as the vacuum pressure in the pipeline, the soil load on the pipe, and the dynamic load;

[0049] Since the composite flexible pressure-resistant inner liner is produced in advance for backup, the composite flexible pressure-resistant inner liner can be sampled and tested for its pressure resistance before actual installation to prevent the composite flexible pressure-resistant inner liner with quality problems from being difficult to remove later after it is installed in the external pipeline to be repaired;

[0050] After the resin glue impregnated on the outside of the single-sided coated felt hose is cured, it provides supporting strength for the single-sided coated felt hose. The pipeline will not be sucked flat when it is under negative pressure, and groundwater and sand will not enter between the inner lining pipe and the outer pipe through the leakage point of the original pipeline, resulting in a weakening of the flow capacity.

[0051] Embodiment 2

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

[0053] The laminating adhesive material is polyurethane, and the resin adhesive material is EP, VE or UP resin;

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

[0055] Embodiment 3

[0056] like Figure 1-Figure 15 As shown, a method for preparing a composite flexible pressure-resistant inner liner pipe is used to prepare a composite flexible pressure-resistant inner liner pipe as described in any one of the above items, comprising the following steps:

[0057] S1. Inject a sufficient amount of resin glue into the single-sided coated felt hose 4, press the resin glue evenly, and soak the felt layer of the single-sided coated felt hose 4, and then stack the single-sided coated felt hose 4 neatly;

[0058] S2. The single-sided coated felt hose 4 impregnated with resin glue is fed from the feed port 36 of the casing device, pulled out from the reducer 12 of the casing device, the front end of the single-sided coated felt hose 4 is turned over, and it is fixed to the reducer 12 by the clamp 37, and the end of the single-sided coated round woven tube 5 is also fixed to the reducer 12;

[0059] S3. The casing device is inflated and pressurized through the pressurized air inlet pipe 9. The single-sided coated felt hose 4 impregnated with resin glue is gradually inserted into the single-sided coated round woven tube 5 in an overturned form under the action of air pressure. The single-sided coated felt hose 4 is bonded to the inner wall of the single-sided coated round woven tube 5 through the resin glue to form a composite flexible pressure-resistant inner liner;

[0060] S4. Remove the composite flexible pressure-resistant liner from the reducer 12, fold it and store or transport it in a cold place;

[0061] The working principle of the above technical solution is as follows: a sufficient amount of resin glue is poured into the single-sided film-coated felt hose 4, and after the resin glue is pressed evenly and soaked into the felt layer of the single-sided film-coated felt hose 4, the single-sided film-coated felt hose 4 is neatly stacked, and a preset amount of water is fed into the casing device from the feeding port 36 of the casing device, and the single-sided film-coated felt hose 4 impregnated with resin glue is fed from the feeding port 36 of the casing device, and the single-sided film-coated felt hose 4 passes through the water inside the casing device, and is pulled out from the reducer 12 of the casing device, and the single-sided film-coated felt hose 4 is turned over. The front end of the single-sided film-coated felt hose 4 is fixed to the reducer 12 by a clamp 37, and the end of the single-sided film-coated circular woven tube 5 is also fixed to the reducer 12. The casing device is inflated and pressurized by the pressurized air inlet pipe 9, so that the air pressure in the casing device increases. The single-sided film-coated felt hose 4 impregnated with resin glue is gradually inserted into the single-sided film-coated circular woven tube 5 in an overturned form under the action of air pressure. The single-sided film-coated felt hose 4 is bonded to the inner wall of the single-sided film-coated circular woven tube 5 by the resin glue to form a composite flexible pressure-resistant inner liner tube;

[0062] The function of the water in the casing equipment is to discharge the air in the single-sided film-coated felt hose 4 impregnated with resin glue, further press the resin glue impregnated in the single-sided film-coated felt hose 4 evenly, and the single-sided film-coated felt hose 4 impregnated with resin glue moves forward in the water, reducing friction.

[0063] Embodiment 4

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

[0065] The pressure difference compensation riser comprises a plurality of middle section pipes 7 and a top pipe 8, wherein the plurality of middle section pipes 7 are connected in series in pairs, the top pipe 8 is fixed to the upper end of the uppermost middle section pipe 7, and the lower end of the lowermost middle section pipe 7 is fixed to the shell 6, a feed port 36 is provided at the upper end of the top pipe 8, and a water level monitoring component and a roller limiting component are provided inside the top pipe 8;

[0066] The working principle of the above technical solution is as follows: after water is injected into the shell 6 from the feed port 36, due to the principle of the communicating vessel, the water level line in the shell 6 is in a level state with the water level line in the middle section pipe 7, and the water level line cannot be higher than the upper end of the water level baffle 13. When the single-sided coated felt hose 4 with the end turned over is fixed to the reducer 12 by the clamp 37, the chamber on the upper side of the water level in the shell 6 is in a relatively closed state. When the shell 6 is inflated and pressurized by the pressurized air inlet pipe 9, the water level in the shell 6 is squeezed down and the water level in the middle section pipe 7 is raised under the action of atmospheric pressure. Therefore, in the middle section pipe 7, a longer water column can be in contact with 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 in the housing 6 can be monitored by a pressure gauge 10;

[0068] For the connection between the single-sided coated felt hose 4 and the single-sided coated round woven tube 5 of different sizes and models, the required pressure is not the same, so the number of the middle section tube 7 can be appropriately increased or decreased to adjust the height of the pressure difference compensation riser to adapt to different casing requirements;

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

[0070] The single-sided film-coated felt hose 4 moves through the roller 14 and enters the reducer 12 , thereby reducing the friction of the single-sided film-coated felt hose 4 during the forward movement, making it easier to be sleeved with the single-sided film-coated round woven 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 to prevent the water in the differential pressure compensation riser from overflowing due to excessive water level;

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

[0073] Embodiment 5

[0074] like Figure 1-Figure 15 As shown, the water level monitoring component includes a limit column 29 slidably connected in the bracket 28, the bracket 28 is fixed in the top pipe 8, the limit column 29 is fixed to the upper end of the hollow float 30, a float rod 1 31 is fixed to the upper end of the hollow float 30, the outer surface of the float rod 1 31 is provided with a scale 1, a float rod 2 32 is inserted into the float rod 1 31, the outer surface of the float rod 2 32 is provided with a scale 2, and a limit cover 33 is fixed to the upper end of the float rod 2 32, and the limit cover 33 is against the upper end of the top pipe 8;

[0075] The working principle of the above technical solution is: when the water level in the middle pipe 7 and the top pipe 8 is higher than the hollow float 30, the buoyancy of the water drives the hollow float 30 to rise, driving the bracket 28 and the limit column 29 to slide, and the limit column 29, the hollow float 30, the float rod 1 31, the float rod 2 32 and the limit cover 33 all rise, and the limit cover 33 is higher than the upper end of the top pipe 8 to remind the operator to stop inflating and pressurizing the shell 6;

[0076] There is a large friction force between the float rod 1 31 and the float rod 2 32. Under normal circumstances, no one touches the float rod 1 31 and the float rod 2 32, and no sliding will occur between the two. The height position of the hollow float 30 is the warning water level height. The warning water level height at this time can be obtained by calculating the scale 1 and the scale 2. Manually plugging and unplugging the float rod 1 31 and the float rod 2 32 changes the position of the hollow float 30, that is, changes the warning water level height, and can be adjusted according to actual usage.

[0077] Embodiment 6

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

[0079] The working principle of the above technical solution is: the end of the single-sided film-coated felt hose 4 is passed around the outer roller 25 and sent into the shell 6, and the outer roller 25 and the top pipe 8 rotate to reduce the friction of the single-sided film-coated felt hose 4 moving forward, so that the single-sided film-coated felt hose 4 and the single-sided film-coated round woven tube 5 are easier to be connected, and at the same time, no greater air pressure is required to squeeze the single-sided film-coated felt hose 4 into the single-sided film-coated round woven tube 5, which saves energy;

[0080] The outer roller 25 is controlled not to rotate, and the screw 38 is rotated, which drives the two screws 38 and the rotating shaft 26 to rotate, and drives the two slip rings 27 to move together or away from each other, thereby changing the distance between the two sets of baffles 39. The two sets of baffles 39 block the two sides of the single-sided film-coated felt hose 4, so that the single-sided film-coated felt hose 4 always enters the shell 6 in the middle position of the top pipe 8, preventing it from deviating and hitting the inner wall of the shell 6, increasing friction, and thus affecting the sleeve connection between the single-sided film-coated felt hose 4 and the single-sided film-coated round woven tube 5;

[0081] By adjusting the distance between the two groups of baffles 39, the single-sided coated felt hose 4 with different pore diameters can be adapted.

[0082] Embodiment 7

[0083] like Figure 1-Figure 15 As shown, an inner tube 21 is fixed to the inner wall of the housing 6, the center line of the pressurized air intake pipe 9 coincides with the center line of the inner tube 21, a blocking column 22 is slidably connected in the inner tube 21, a spring 24 is provided between the blocking column 22 and the bottom of the inner tube 21, a sealing ring 20 is provided between the blocking column 22 and the inner wall of the housing 6, and a plurality of long holes 23 are provided on the side wall of the inner tube 21;

[0084] The housing 6 is provided with a water outlet pipe 34 on its side, and a ball valve 35 is rotatably connected to the water outlet pipe 34;

[0085] The working principle of the above technical solution is as follows: when the pressurized air intake pipe 9 is used to inflate and pressurize the shell 6, the gas squeezes the blocking column 22 to move downward in the inner tube 21, driving the spring 1 24 to be compressed. After the blocking column 22 moves downward to a certain height, the gas enters the shell 6 through the long hole 23. When the pressurized air intake pipe 9 is accidentally separated from the inflatable device, under the dual action of the air pressure inside the shell 6 and the elastic force of the spring 1 24, the blocking column 22 is driven to move upward rapidly and abut against the sealing ring 20, sealing the long hole 23 to prevent the gas in the shell 6 from overflowing and causing energy loss.

[0086] When the water in the shell 6 needs to be replaced, the ball valve 35 in the water outlet pipe 34 is opened, and the water in the shell 6 flows out through the water outlet pipe 34 .

[0087] Embodiment 8

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

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

[0090] The working principle of the above technical solution is: rotate the pressing plate 19 to separate the front end of the pressing plate 19 from the cover plate 15, pull the handle 17, and the cover plate 15 and the shell 6 can be rotated and opened, and the inside can be operated through the opening on the shell 6, especially in the early stage, when the single-sided film-coated felt hose 4 passes through the shell 6, the cover plate 15 can be opened to pull the single-sided film-coated felt hose 4 passing through;

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

[0092] Embodiment 9

[0093] like Figure 1-Figure 15As shown, the reducer 12 includes a reducer body 1201, which is fixedly connected to the flange 11, and a threaded outer tube 1202 is threadedly connected to the end of the reducer body 1201. A limit ring 1203 is rotatably connected to the threaded outer tube 1202, and the limit ring 1203 is fixedly connected to a connecting column 1204, and the connecting column 1204 is fixedly connected to an inner slide 1205, and the inner slide 1205 slides in a slide groove 1206 on the reducer body 1201, and the connecting column 1204 is rotatably connected to one end of a rotating rod 1207, and the other end of the rotating rod 1207 is rotatably connected to an arc-shaped support plate 1208, and the end of the arc-shaped support plate 1208 is fixedly connected to a slide rod 1209, and the slide rod 1209 slides in a slide groove 2 1210 on the reducer body 1201, and a rubber sleeve is provided on the reducer body 1201 1211, one end of the rubber sleeve 1211 is glued and fixed at 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 shell 6, and the end of the single-sided film-coated felt hose 4 is turned over and sleeved on the arc-shaped support plate 1208. The front end of the single-sided film-coated felt hose 4 is bent and fits with the slide bar 1209, and the end of the single-sided film-coated circular woven tube 5 is inserted on the outer side of the end of the single-sided film-coated felt hose 4. The rubber sleeve 1211 covers the outer side of the single-sided film-coated circular woven tube 5, and the rubber sleeve 1211, the end of the single-sided film-coated circular woven tube 5 and the outward-turned end of the single-sided film-coated felt hose 4 are fixed on the arc-shaped support plate 1208 by locking the clamp 37, and the side of the locking clamp 37 squeezes the rubber sleeve 1211 and the outward-turned front end of the single-sided film-coated felt hose 4 onto the slide bar 1209;

[0094] The working principle of the above technical solution is as follows: after the end of the single-sided film-coated felt hose 4 passes through the reducer body 1201 from the inside of the shell 6, the end of the single-sided film-coated felt hose 4 is turned over and sleeved on the arc-shaped support plate 1208, the front end of the single-sided film-coated felt hose 4 is bent and fits with the slide bar 1209, the end of the single-sided film-coated circular woven tube 5 is inserted into the outer side of the end of the single-sided film-coated felt hose 4, the rubber sleeve 1211 covers the outer side of the single-sided film-coated circular woven tube 5, and the rubber sleeve 1211, the end of the single-sided film-coated circular woven tube 5 and the outward-turned end of the single-sided film-coated felt hose 4 are fixed to the arc-shaped support plate 1208 by the locking clamp 37, and the side of the locking clamp 37 squeezes the rubber sleeve 1211 and the outward-turned front end of the single-sided film-coated felt hose 4 onto the slide bar 1209 to enhance the sealing and prevent gas from overflowing;

[0095] Rotate the threaded outer tube 1202, and the threaded outer tube 1202 moves inward or outward on the reducer body 1201, driving the limit ring 1203 to move with the threaded outer tube 1202, driving the four connecting columns 1204 and the four inner slides 1205 to slide on the reducer body 1201 through the four slide grooves 1206 respectively, driving the four groups of rotating rods 1207 to rotate, driving the four arc-shaped support plates 1208 to move together or away, driving the four slide bars 1209 to slide in the four slide grooves 2 1210 respectively, and after the four arc-shaped support plates 1208 move, their calibers are changed, thereby adapting to the socketing between the single-sided coated felt hose 4 and the single-sided coated round woven tube 5 of different calibers, and having strong adaptability.

[0096] Embodiment 10

[0097] like Figure 1-Figure 15 As shown, an application of a composite flexible pressure-resistant liner pipe prepared by the method for preparing a composite flexible pressure-resistant liner pipe described in any one of the above in trenchless repair of pipelines;

[0098] Working principle of the above technical solution: Pipeline trenchless repair technology refers to the use of original pipe resources without excavation or less excavation, with inspection wells, valve wells, etc. as operating space, and adopting relevant technologies to install a new lining pipe in the existing pipeline, so that the pipeline can be regenerated, thereby extending its service life. It is widely used in pipeline renewal;

[0099] At present, mainstream trenchless pipeline repair technologies represented by CIPP, FIPP, mechanical spiral winding, polymer mortar spraying, short pipe replacement, and interlacing methods are widely used in drainage gravity flow pipeline renewal and repair projects, exceeding excavation and replacement of pipelines. Water supply, gas, and heating pipeline renewal projects are also gradually being promoted, but due to technical limitations, the promotion speed is slower than gravity drainage.

[0100] The composite flexible pressure-resistant liner pipe is used in trenchless pipeline repair to repair existing pipelines, regenerate the pipelines, and thus extend their service life.

[0101] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A composite flexible pressure-resistant liner pipe, characterized in that: The invention comprises a supporting structure layer (3), wherein the supporting structure layer (3) is bonded to the inner wall of a pressure-bearing structure layer (2) by resin glue, the pressure-bearing structure layer (2) is attached to the inner wall of an external pipe (1) to be repaired, the pressure-bearing structure layer (2) is a round woven tube and a single-sided coated circular woven tube (5) composed of a coated glue extruded on its outer wall, the supporting structure layer (3) is composed of a single-sided coated felt hose (4) and resin glue impregnated thereon, and the single-sided coated felt hose (4) is bonded to the inner wall of the single-sided coated circular woven tube (5) by resin glue.

2. A composite flexible pressure-resistant liner pipe according to claim 1, characterized in that: The single-sided coated circular woven tube (5) is made of industrial filaments such as polyester or nylon.

3. A composite flexible pressure-resistant liner pipe according to claim 1, characterized in that: The laminating adhesive material is polyurethane, and the resin adhesive material is EP, VE or UP resin.

4. A method for preparing a composite flexible pressure-resistant inner liner pipe, used for preparing a composite flexible pressure-resistant inner liner pipe according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Inject a sufficient amount of resin glue into the single-sided coated felt hose (4), press the resin glue evenly, and soak the felt layer of the single-sided coated felt hose (4), and then stack the single-sided coated felt hose (4) neatly; S2. The single-sided coated felt hose (4) impregnated with resin glue is fed from the feed port (36) of the casing device, pulled out from the reducer (12) of the casing device, the front end of the single-sided coated felt hose (4) is turned over, and it is fixed to the reducer (12) by a clamp (37), and the end of the single-sided coated round woven tube (5) is also fixed to the reducer (12); S3. The casing device is inflated and pressurized through the pressurized air inlet pipe (9). The single-sided coated felt hose (4) impregnated with resin glue is gradually inserted into the single-sided coated circular woven tube (5) in an overturned form under the action of air pressure. The single-sided coated felt hose (4) is bonded to the inner wall of the single-sided coated circular woven tube (5) through the resin glue to form a composite flexible pressure-resistant inner liner; S4. Remove the composite flexible pressure-resistant liner pipe from the reducer (12), fold it, and store or transport it in a cold place.

5. The method for preparing a composite flexible pressure-resistant liner pipe according to claim 4, characterized in that: The casing device comprises a shell (6), a pressure differential compensation riser is provided on the side of the shell (6), the lower end of the pressure differential compensation riser is connected to the inside of the shell (6), the upper end of the pressure differential compensation riser is provided with a feed port (36), a water level baffle (13) is provided in the shell (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 shell (6), and a pressurized air inlet pipe (9) and a pressure gauge (10) are provided at the upper end of the shell (6).

6. The method for preparing a composite flexible pressure-resistant liner pipe according to claim 5, characterized in that: The pressure difference compensation riser comprises a plurality of middle section pipes (7) and a top pipe (8), wherein the plurality of middle section pipes (7) are connected in series in pairs, the top pipe (8) is fixed to the upper end of the middle section pipe (7) at the uppermost side, the lower end of the middle section pipe (7) at the lowermost side is fixed to the shell (6), a feed port (36) is provided at the upper end of the top pipe (8), and a water level monitoring component and a roller limiting component are provided inside the top pipe (8).

7. The method for preparing a composite flexible pressure-resistant liner pipe according to claim 6, characterized in that: The water level monitoring component comprises a limit column (29) slidably connected in a bracket (28), the bracket (28) is fixed in a top pipe (8), the limit column (29) is fixed at the upper end of a hollow floating ball (30), a floating rod (31) is fixed at the upper end of the hollow floating ball (30), a scale (1) is provided on the outer surface of the floating rod (31), a floating rod (32) is inserted in the floating rod (31), a scale (2) is provided on the outer surface of the floating rod (32), a limit cover (33) is fixed at the upper end of the floating rod (32), and the limit cover (33) is against the upper end of the top pipe (8); The roller limiting component comprises an outer roller (25), the outer roller (25) rotates on the top pipe (8), a rotating shaft (26) is rotatably connected to the middle position of the outer roller (25), two screw rods (38) with opposite thread directions are respectively fixed at both ends of the rotating shaft (26), two slip rings (27) are respectively threadedly connected to the two screw rods (38), and the two slip rings (27) are both provided with a baffle (39), which slides on the roller (25) and has a front end located outside the outer roller (25).

8. The method for preparing a composite flexible pressure-resistant liner pipe according to claim 7, characterized in that: An inner pipe (21) is fixed to the inner wall of the shell (6), the center lines of the pressurized air intake pipe (9) and the inner pipe (21) coincide with each other, a blocking column (22) is slidably connected inside the inner pipe (21), a spring (24) is provided between the blocking column (22) and the bottom of the inner pipe (21), a sealing ring (20) is provided between the blocking column (22) and the inner wall of the shell (6), and a plurality of long holes (23) are provided on the side wall of the inner pipe (21); A water outlet pipe (34) is provided on the side of the housing (6), and a ball valve (35) is rotatably connected inside the water outlet pipe (34).

9. The method for preparing a composite flexible pressure-resistant liner pipe according to claim 8, characterized in that: The shell (6) is rotatably connected to a cover plate (15). After the cover plate (15) is covered on the shell (6), a sealing ring (16) is provided between the cover plate (15) and the shell (6). The cover plate (15) is provided with a handle (17). A support column (18) is fixed on the shell (6). A pressing plate (19) is rotatably connected to the support column (18). The front end of the pressing plate (19) abuts against the upper surface of the cover plate (15). The housing (6) is fixedly connected to the reducer (12) via a flange (11).

10. Use of a composite flexible pressure-resistant liner pipe prepared by the method for preparing a composite flexible pressure-resistant liner pipe as described in any one of claims 4 to 9 in trenchless repair of pipelines.

Images