A trenchless repair apparatus and method for a buried water supply pipe

Abstract

The application provides a kind of non-excavation repair device and method of buried water supply pipeline, the repair device includes inner lining pipe reel, for winding transport its section extruded H-shaped inner lining pipe;Steam generator, for the section extruded H-shaped inner lining pipe is heated and softened;Air bag, for the section extruded H-shaped inner lining pipe after softening is supported round, to form the inner lining pipe of the end face round;Hot melt welding device, for the welding connection of two section inner lining pipe of the end face round;Roller device, for the section extruded H-shaped inner lining pipe after softening is extruded to form the section extruded H-shaped inner lining pipe;The repair step includes the welding lengthening of the section extruded H-shaped inner lining pipe, until the inner lining pipe being pulled reaches the repair length of the broken pipe.

Description

A trenchless repair device and method for buried water supply pipelines Technical Field

[0001] This invention relates to the technical field of trenchless pipeline repair, and more particularly to a trenchless repair device and method for buried water supply pipelines. Background Technology

[0002] Existing buried water supply pipelines, after years of use, frequently suffer from defects such as scaling and pipe bursts, seriously affecting the normal lives of urban residents. As these are pressure pipelines, repairs require strict adherence to standards regarding the hygiene, dimensions, and strength of the materials used. Current repair technologies, including stainless steel lining and folded lining repair, often struggle to achieve a tight fit with the original pipeline.

[0003] A particularly common problem during the repair process is that, due to the limited length of the inner lining material in a single reel, there is a problem of insufficient length in long-distance and ultra-long-distance trenchless lining repair construction. The usual method is to place the inner lining pipe inside the original pipeline and connect it with the previous inner lining pipe after the entire length has been laid, and then manually or by welding vehicle enter the pipeline to weld the two or more connected pipes. This is not only complicated to operate, but also extremely time-consuming. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide a trenchless repair device and method for buried water supply pipelines, so as to avoid the problem of insufficient length of the inner lining material when using inner lining pipes for the repair of ultra-long pipelines.

[0005] To address the aforementioned technical problems, this invention provides a trenchless repair device for buried water supply pipelines, comprising:

[0006] Inner liner reel, used for winding and transporting inner liner tubes whose cross-section is extruded into an I-shape;

[0007] A steam generator is used to heat and soften the inner liner tube, which is extruded into an I-shape.

[0008] An airbag is used to round out the softened cross-section of the inner liner tube, which is extruded into an I-shape, so as to form an inner liner tube with a round end face.

[0009] A hot melt welding device is used to weld two sections of the inner liner tube with circular end faces.

[0010] A pressure roller device is used to extrude the softened inner liner tube with a circular end face to form the inner liner tube with an I-shaped cross section.

[0011] The hot melt welding device includes two annular clamps and a heating plate arranged opposite each other; the two annular clamps are configured to move closer to or further away from each other; the heating plate is configured to move up and down and can be lowered between the two annular clamps.

[0012] The pressure roller device is disposed on the side of one of the annular clamps facing away from the heating plate; the two annular clamps are used to clamp the port of the inner liner tube with a circular end face after being rounded by the airbag; and transport the port to the heating plate for heat melting;

[0013] After the port is heat-melted, the heating plate is raised and then transported to the two heat-melted ports by the two ring clamps for mutual compression and docking.

[0014] In a preferred embodiment, the inner liner reel consists of a reel frame and a reel; the reel is mounted on the reel frame via a load-bearing shaft.

[0015] The reel includes an inner frame and an outer frame connected to the outside of the inner frame. The diameter difference between the inner frame and the outer frame constitutes the volume that the inner liner tube can be wound into the reel.

[0016] In a preferred embodiment, one end of the load-bearing shaft is provided with a universal joint with a built-in gas channel, the gas channel being used to connect to the steam generator;

[0017] The inner frame is provided with a locking element near the universal joint to lock the end of the wound inner liner tube onto the inner frame; and a steam inlet is opened at the rear end of the end to communicate with the gas channel.

[0018] In a preferred embodiment, the pressure roller device includes a transverse pressure roller and a longitudinal pressure roller; a set of the transverse pressure roller or the longitudinal pressure roller is symmetrically arranged on both sides of the inner liner tube, and at least one set of the transverse pressure roller and the longitudinal pressure roller is arranged on one side of the inner liner tube.

[0019] In a preferred embodiment, the pressure roller device is provided with a transverse pressure roller and a longitudinal pressure roller in sequence along the pulling direction of the inner liner tube.

[0020] In a preferred embodiment, the hot melt welding device includes a hydraulic cylinder for driving the two annular clamps to move closer to or further away from each other.

[0021] A trenchless repair method for buried water supply pipelines, using the aforementioned trenchless repair device for buried water supply pipelines;

[0022] The excavation and repair method includes the following steps:

[0023] Step 1: Cut the pipe and install a flange at the end of the cut pipe; clean the inside of the cut pipe with a cleaning vehicle;

[0024] Step 2: Heat and soften the inner lining tube, which is extruded into an I-shape on the inner lining tube reel with the inner lining tube wound around it; fill and seal one end of the inner lining tube that is extruded into an I-shape, which is the end of the inner lining tube wound on the inner lining tube reel; and open a steam inlet at the rear end of the inner lining tube at the rear end of the inner lining tube to connect to the steam generator so as to introduce steam for heating and softening.

[0025] Step 3: First pulling of the inner liner tube; pull the inner liner tube, which has been heated and softened and whose cross-section is squeezed into an I-shape, into the pipe of the broken pipe to be repaired, until all the inner liner tubes on the inner liner tube reel are pulled out.

[0026] Step 4: Weld and extend the extruded I-shaped inner liner tube; the end of the extruded I-shaped inner liner tube, which is dragged into the pipe to be repaired, is further heated and softened by another steam generator. Repeat step 2, insert an air bag into the beginning and end of the new extruded I-shaped inner liner tube to round the port and cut the end face flat, and weld the end and the beginning of the tube together using a hot melt welding device.

[0027] Step 5: Steam is introduced through the gas channel on the inner liner reel to heat and soften the inner liner with a circular end face after welding. Then, the inner liner is pulled a second time. The inner liner is squeezed by the pressure roller device to form the inner liner with an I-shaped cross section. The inner liner is pulled into the pipeline to be repaired. Steps 4 and 5 are repeated until the pulled inner liner reaches the repair length of the broken pipeline.

[0028] Step 6: Restore the I-shaped inner liner tube that has been squeezed into the cross section of the pipe to be repaired; after locally heating and softening both ends of the inner liner tube, insert air plugs and introduce steam into the inner liner tube through the air plugs. After the inner liner tube softens, stop steam heating; then introduce other gases into the inner liner tube through the air plugs to pressurize it until the inner liner tube is tightly attached to the original pipe; after maintaining the pressure for a certain period of time, convert the steam into cold air to cool the inner liner tube.

[0029] Step 7: After the inner liner has cooled, remove the inflation plug and fold the ends of the inner liner at both ends of the pipe to be repaired; fold the inner liner onto the previously installed flange.

[0030] Step 8, Pipe Breakage Restoration: The broken pipe is reconnected using a pipe break with a flange and an expansion joint or telescoping joint.

[0031] In a preferred embodiment, in step 1, sheet piles are used for support after the pipe is cut; and the length of the cut pipe is set at 2m-3m.

[0032] In a preferred embodiment, in step 1, the cleaning vehicle uses ultra-high pressure water cleaning, mechanical cleaning, or sandblasting cleaning.

[0033] In a preferred embodiment, the inflation plug has a vent hole and an inflation hole in the middle; the vent hole is used to connect to the steam softening liner tube; the inflation hole is used to introduce pressurized gas into the inflation plug.

[0034] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0035] 1. This invention provides a trenchless repair method that allows for the unlimited extension of the inner lining pipe required for repair during pipeline repair. This solves the problem of insufficient length of the inner lining pipe material in a single reel, which is a common issue in long-distance and ultra-long-distance trenchless inner lining repair construction. When using inner lining pipes for ultra-long pipeline inner lining repair construction, the problem of insufficient inner lining material length is not a concern.

[0036] 2. This invention provides a trenchless repair device, including an airbag, a hot-melt welding device, and a pressure roller device. It can perform a butt-jointing and lengthening operation on the inner liner before pulling it into the pipeline. The lengthened inner liner can still maintain the I-shaped structure of its end face, ensuring that the inner liner can be rounded and restored in the pipeline to be repaired. Moreover, maintaining the I-shaped structure of the inner liner end face after the lengthening operation will not affect the subsequent second pulling operation of the inner liner into the pipeline. Attached Figure Description

[0037] Figure 1 is a front view of the inner liner tube reel in a preferred embodiment of the present invention;

[0038] Figure 2 is a cross-sectional view of AA in Figure 1;

[0039] Figure 3 is a side view of the inner liner reel in a preferred embodiment of the present invention;

[0040] Figure 4 is a cross-sectional view of CC in Figure 3;

[0041] Figure 5 is a front view of the hot melt welding device and the pressure roller device in a preferred embodiment of the present invention;

[0042] Figure 6 is a schematic diagram of the structure of the inner liner tube with a circular end face clamped on the hot melt welding device in a preferred embodiment of the present invention;

[0043] Figure 7 is a schematic diagram of the structure of two circular end-faced inner liner tubes joined together in a preferred embodiment of the present invention;

[0044] Figures 8-13 are schematic diagrams of the on-site steps of the trenchless repair method in a preferred embodiment of the present invention.

[0045] Explanation of reference numerals in the attached drawings: 1. Inner liner reel; 11. Reel frame; 12. Reel; 121. Inner frame; 122. Outer frame; 13. Load-bearing shaft; 14. Universal joint; 15. Gas passage; 16. Locking element; 17. Filling material; 2. Steam generator; 3. Hot melt welding device; 31. Ring clamp; 32. Heating plate; 33. Hydraulic cylinder; 34. Hydraulic station; 4. Pressure roller device; 41. Transverse pressure roller; 42. Longitudinal pressure roller; 5. Inner liner; 51. Inner liner with an I-shaped cross-section; 52. Inner liner with a rounded end face; 53. Steam inlet; 6. Flange; 7. Cleaning cart; 8. Expansion joint. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0049] Referring to Figures 1-7, this embodiment provides a trenchless repair device and method for buried water supply pipelines. Its main purpose is to solve the problem of insufficient length of the inner lining pipe 5 of a single reel 12 in trenchless inner lining repair construction over long and ultra-long distances.

[0050] The trenchless repair device involved in this embodiment includes

[0051] Inner liner reel 1, used for winding and transporting inner liner 51 whose cross-section is extruded into an I-shape;

[0052] Steam generator 2 is used to heat and soften the inner liner tube 51, which is extruded into an I-shape.

[0053] An airbag is used to round out the softened cross-section of the inner liner tube 51, which is extruded into an I-shape, so as to form an inner liner tube 52 with a round end face.

[0054] The hot melt welding device 3 is used to weld the two sections of the inner liner tube 52 with circular end faces together.

[0055] The pressure roller device 4 is used to press the softened inner liner tube 52 with a circular end face to form the inner liner tube 51 with an I-shaped cross section.

[0056] The hot-melt welding device 3 includes two annular clamps 31 and a heating plate 32 arranged opposite each other. The two annular clamps 31 are configured to move closer to or further away from each other. The heating plate 32 is configured to move vertically and can be lowered between the two annular clamps 31. In this embodiment, the hot-melt welding device 3 includes a hydraulic cylinder 33 for driving the two annular clamps 31 to move closer to or further away from each other. The hydraulic cylinder 33 is connected to a hydraulic station 34, which provides hydraulic driving force.

[0057] The pressure roller device 4 is disposed on the side of one of the annular clamps 31 away from the heating plate 32; the two annular clamps 31 are used to clamp the port of the inner liner tube 52 with a circular end face after being rounded by the airbag; and transport the port to the heating plate 32 for heat melting; after the port is heat melted, the heating plate 32 is raised, and the two annular clamps 31 are used to transport the two heat-melted ports to each other for mutual compression and docking.

[0058] Specifically, the pressure roller device 4 includes a transverse pressure roller 41 and a longitudinal pressure roller 42; a set of transverse pressure rollers 41 or longitudinal pressure rollers 42 are symmetrically arranged on both sides of the inner liner tube 5, and at least one set of transverse pressure rollers 41 and longitudinal pressure rollers 42 is arranged on one side of the inner liner tube 5. The pressure roller device 4 is arranged with transverse pressure rollers 41 and longitudinal pressure rollers 42 in sequence along the pulling direction of the inner liner tube 5.

[0059] The inner liner tube reel 1 consists of a reel frame 11 and a reel 12; the reel 12 is mounted on the reel frame 11 via a load-bearing shaft 13; the reel 12 includes an inner frame 121 and an outer frame 122 connected to the outside of the inner frame 121, and the diameter difference between the inner frame 121 and the outer frame 122 constitutes the volume that the inner liner tube 5 can be wound into the reel 12.

[0060] Specifically, one end of the load-bearing shaft 13 is provided with a universal joint 14 with a built-in gas channel 15, the gas channel 15 being used to connect to the steam generator 2; the inner frame 121 is provided with a locking member 16 near the universal joint 14, which is used to lock the end of the wound inner liner tube 5 onto the inner frame 121; and a steam inlet 53 is opened at the rear end of the end to communicate with the gas channel 15.

[0061] This embodiment provides a trenchless repair method for buried water supply pipelines, as shown in Figures 8-13, including the following steps:

[0062] Step 1: Cut the pipe and install flange 6 at the port of the cut pipe; clean the inside of the pipe with a cleaning vehicle.

[0063] In step 1, pipe disconnection is necessary: ​​due to the long distance of the water supply pipeline and the presence of numerous bends and branch sections, pipe disconnection is required before repair. Steel sheet piles are needed for support during the excavation of the work pit, and the disconnected pipe length is generally 2-3 meters.

[0064] After the pipe is cut, in order to facilitate the connection of the repaired pipe, flange 6 needs to be installed at the port. For steel pipes, flange 6 can be installed by welding. For non-steel pipes, flange 6 needs to be divided into two pieces and welded to the pipe pieces respectively, and then connected to the original pipe by clamping.

[0065] The cleaning truck 7 is used to clean the scale inside the pipeline. Depending on the site conditions, ultra-high pressure water cleaning, mechanical cleaning or sandblasting cleaning can be selected.

[0066] Step 2: Heat and soften the inner lining tube 51, which is extruded into an I-shape on the inner lining tube reel 1 with the inner lining tube 5 wound on it; fill and seal one end of the inner lining tube 51, which is the end of the inner lining tube 5 wound on the inner lining tube reel 1; and open a steam inlet 53 at the rear end of the inner lining tube 51 to connect to the steam generator 2 so as to introduce steam for heating and softening.

[0067] Step 2 includes material preparation. Factory equipment produces and extrudes the inner liner tube 5, extrudes its cross-section into an "I" shape, and winds it onto the liner tube reel 12. The liner tube reel 12 consists of a reel frame 11 and a reel 12. The reel 12 is supported on the reel frame 11 via a support shaft 13. One end of the support shaft 13 is equipped with a universal joint 14, which contains an air passage 15. The reel 12 is divided into inner and outer frames 122. The inner frame 121 connects the two outer frames 122 into a single unit, while the outer frames 122 prevent the inner liner tube 5 material wound outside the inner frame 121 from slipping off. Therefore, the diameter difference between the outer frame 122 and the inner frame 121, and the resulting space, determine the volume of inner liner tube 5 material that the reel 12 can wind and hold.

[0068] Before heating and softening the inner liner tube 5, a foam-like filler material 17 is inserted into the port of the inner liner tube 5 to seal the port. Then, this end is fixed and locked inside the inner frame 121 of the reel 12 with two square tubes and long bolts (i.e., locking pieces 16) using a double-fastening clamping method. A round opening is made at the rear of this section to lock a section of metal steam inlet pipe as a steam inlet 53 for internal heating, and this steam inlet 53 is connected to the gas channel 15.

[0069] A wooden board can be installed on the outside of the inner frame 121 of the reel 12 to reduce friction damage between the outer surface of the inner liner tube 5 and the square tube that makes up the inner frame 121 of the reel 12, as well as the indentation caused by the contact with the square tube.

[0070] Step 3: During construction, the inner lining tube 5 is pulled for the first time; the steam delivery pipe of the steam generator 2 is connected to the air inlet of the universal joint 14 on the inner lining tube reel 1, and steam is introduced to heat the inner lining tube 5 from the inside; after the inner lining tube 5 softens, the inner lining tube 51, which has been heated and softened and whose cross-section is squeezed into an I-shape, is pulled into the pipeline of the broken pipe to be repaired. During the pulling process of the inner lining tube 5, the inner lining tube 5 is continuously heated to prevent the inner lining tube 5 from cooling down and being unable to be pulled into the pipeline, until all the inner lining tubes 5 on the inner lining tube reel 1 are pulled.

[0071] Step 4: Weld and extend the I-shaped inner liner 51 by extruding the cross section; the end of the I-shaped inner liner 51, which is dragged into the pipe to be repaired, is further heated and softened by another steam generator 2. Repeat step 2, insert an air bag into the beginning end and the end end of the new I-shaped inner liner 51 to round the port and cut the end face flat, and weld the end end and the beginning end together using a hot melt welding device 3.

[0072] In step 4, the inner liner tube 5 is hot-melt welded: After the first inner liner tube reel 1 is pulled out, the end of the inner liner tube 5 to be repaired is pulled in and heated with hot air at the front end of another reel 12. The material softens and is stuffed into an airbag of the same type to round and flatten the end face. After the inner liner tube 5 material cools and solidifies, the airbag is removed. A small crane is used to lift the rounded tube end to the corresponding position of the hot-melt welding device 3 and clamp it with an annular clamp 31. The heating plate 32 of the hot-melt welding device 3 heats the inner liner tube 5 material to blow it into a circle and fixes it to the annular end face on the hot-melt welding device 3. When visible melting occurs at the heating point, the hot-melt welding device 3 is operated to raise the heating plate 32, so that the molten annular end face is squeezed and joined in the middle. The clamp is opened to check whether there is any water or air leakage at the welded section. If there is no leakage, the surface of the welded section is smoothed.

[0073] Step 5: Steam is introduced through the gas channel 15 on the inner liner reel 1 to heat and soften the inner liner 52, which has a circular end face after welding. Then, the inner liner 5 is pulled a second time. The inner liner 5 is squeezed by the pressure roller device 4 to form the inner liner 51 with an I-shaped cross-section. The inner liner 5 is pulled into the pipeline to be repaired. Steps 4 and 5 are repeated until the pulled inner liner 5 reaches the repair length of the broken pipe.

[0074] In step 5, the inner liner tube 5 is pulled a second time: the clamps at both ends of the hot melt welding device 3 are replaced, and the pressure roller device 4 for folding the inner liner material is installed. The steam pipe on the steam generator 2 is connected to the steam inlet 53 on the new reel 12 to continue heating the inside of the inner liner tube 5. After the material softens, it is pulled into the pipeline to be repaired. The softened inner liner tube 5 material is pulled through the pressure rollers and rollers of the pressure roller device 4, which shape the material by passing through the transverse pressure roller 41 and the longitudinal pressure roller 42, so that the cross section of the inner liner tube 5 material is folded back to the initial "I" shape. Then the hot melt welding device 3 is removed, and the inner liner tube 5 is pulled into the pipeline to be repaired. If the length of this roll is insufficient, the inner liner tube 5 material on the next reel is welded to lengthen it until the repair length is reached.

[0075] Step 6: Restore the I-shaped inner liner 5 that has been squeezed into the cross section of the pipeline to be repaired; after locally heating and softening both ends of the inner liner 5, insert air plugs and introduce steam into the inner liner 5 through the air plugs. After the inner liner 5 softens, stop steam heating; then introduce other gases into the inner liner 5 through the air plugs to pressurize it until the inner liner 5 is tightly attached to the original pipeline; after maintaining the pressure for a certain period of time, convert the steam into cold air to cool the inner liner 5.

[0076] In step 6, the inner liner tube 5 is restored: After the inner liner tube 5 is pulled in, the excess inner liner tube 5 is cut off at both ends. The ends of the inner liner tube 5 are locally heated until the end material softens, and then an inflation plug is inserted. The inflation plug has a vent hole and an inflation hole in the middle. The vent hole is located in the middle of the inflation plug for subsequently introducing steam into the hose, and the inflation hole is used to pressurize and expand the inflation plug. By inflating the inflation hole of the inflation plug, the softened inner liner tube 5 forms local bulges at both ends, and the pressure inside the inflation plug is maintained. After the liner tube cools down, the steam pipe of the steam generator 2 is connected to the vent hole of the inflation plug, and steam continues to be introduced into the inner liner tube 5 to continue heating the inner liner tube 5. After the inner liner tube 5 softens, the steam valve is gradually closed, and the inner liner tube 5 is pressurized until the inner liner tube 5 is tightly attached to the original pipe. After maintaining the pressure for a certain period of time, the steam is converted into cold air to cool the inner liner tube 5.

[0077] Step 7: After the inner liner 5 has cooled, remove the inflation plug and fold the ends of the inner liner 5 at both ends of the pipe to be repaired; fold the inner liner 5 onto the previously installed flange 6.

[0078] In step 7, the port is flanged: after the inner liner tube 5 is cooled, the air plugs at both ends are removed, and a special flange tool is used to flange the inner liner tube 5 at both ends so that the inner liner tube 5 is flanged onto the previously installed flange 6.

[0079] Step 8, Pipe Breakage Restoration: The broken pipe is connected using a pipe break with a flange and an expansion joint or telescoping joint 8.

[0080] In step 8, the broken pipe is restored: the broken pipe is connected using a flanged broken pipe and an expansion joint or telescoping joint 8. A pressure test is performed on the repaired pipe. After the test is passed, the working pit is backfilled and a manhole is installed at this location.

[0081] The trenchless repair method for buried water supply pipelines provided in this embodiment eliminates the problem of insufficient lining material length when using the inner lining pipe 5 for the repair of ultra-long pipelines.

[0082] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A trenchless repair device for buried water supply pipelines, characterized in that: The system includes: an inner liner reel for winding and transporting an inner liner whose cross-section is extruded into an I-shape; a steam generator for heating and softening the inner liner whose cross-section is extruded into an I-shape; an air bladder for rounding the softened inner liner whose cross-section is extruded into an I-shape to form an inner liner with a rounded end face; a hot-melt welding device for welding two sections of the inner liner with rounded end faces together; and a pressure roller device for extruding the softened inner liner with rounded end faces to form the inner liner whose cross-section is extruded into an I-shape. The hot-melt welding device includes two annular clamps and a heating plate arranged opposite each other. The two annular clamps are configured to move closer to or further away from each other. The heating plate is configured to move vertically and can be lowered between the two annular clamps. The pressure roller device is disposed therein. One of the ring clamps is located on the side opposite to the heating plate; two ring clamps are used to clamp the port of the inner liner tube, which has a circular end face after being rounded by the airbag; and transport the port to the heating plate for heat fusion; after the port is heat fused, the heating plate is raised, and the two ring clamps are used to transport the two heat-fused ports for mutual compression and docking; one end of the load-bearing shaft of the inner liner tube reel is provided with a universal joint with a built-in gas channel, which is used to connect to the steam generator; the heat fusion welding device is arranged on the ground on one side of the pipe cutting operation pit and is located upstream of the pressure roller device; the pressure roller device and the ring clamps share the same track base, so that the circular inner liner tube, after being welded and lengthened, can enter the pressure roller device in a straight line and be re-pressed into an I-shaped cross section, thereby performing continuous operation of external pipe welding and internal pipe restoration.

2. The trenchless repair device for buried water supply pipelines according to claim 1, characterized in that: The inner liner tube reel consists of a reel frame and a reel; the reel is mounted on the reel frame via a load-bearing shaft; the reel includes an inner frame and an outer frame connected to the outside of the inner frame, and the annular space between the inner frame and the outer frame constitutes the volume that the inner liner tube can be wound onto the reel.

3. The trenchless repair device for buried water supply pipelines according to claim 2, characterized in that: The inner frame is provided with a locking element near the universal joint to lock the end of the wound inner liner tube onto the inner frame; and a steam inlet is opened at the rear end of the end to communicate with the gas channel.

4. The trenchless repair device for buried water supply pipelines according to claim 1, characterized in that: The pressure roller device includes a transverse pressure roller and a longitudinal pressure roller; a set of the transverse pressure roller or the longitudinal pressure roller is symmetrically arranged on both sides of the inner liner tube, and at least one set of the transverse pressure roller and the longitudinal pressure roller is arranged on one side of the inner liner tube.

5. A trenchless repair device for buried water supply pipelines according to claim 4, characterized in that: The pressure roller device is provided with transverse pressure rollers and longitudinal pressure rollers in sequence along the pulling direction of the inner liner tube.

6. The trenchless repair device for buried water supply pipelines according to claim 1, characterized in that: The hot melt welding device includes a hydraulic cylinder for driving the two annular clamps to move closer to or further away from each other.

7. A trenchless repair method for buried water supply pipelines, characterized in that: A trenchless repair device for buried water supply pipelines according to any one of claims 1-6; the trenchless repair method includes the following steps: Step 1, pipe breakage treatment and installation of a flange at the end of the broken pipe; cleaning the inside of the broken pipe with a cleaning vehicle; Step 2, heating and softening the inner liner tube, which is extruded into an I-shape on an inner liner tube reel with an inner liner tube wound around it; filling and sealing one end of the inner liner tube, which is the end of the inner liner tube wound on the inner liner tube reel; and opening a steam valve at the rear end of the one end. The inlet is connected to the steam generator to introduce steam for heating and softening; Step 3: First pulling of the inner liner tube; The heated and softened inner liner tube, with its cross-section extruded into an I-shape, is pulled into the pipe to be repaired until all the inner liner tubes on the inner liner tube reel are pulled out; Step 4: Welding and lengthening of the inner liner tube with its cross-section extruded into an I-shape; The end of the inner liner tube with its cross-section extruded into an I-shape, which has been pulled into the pipe to be repaired, is further heated and softened by another steam generator, and Step 2 is repeated, inserting an air bag into the beginning and end of the new inner liner tube with its cross-section extruded into an I-shape. Step 5: Round and flatten the end face of the inner liner tube after welding. Then, weld the end face to the beginning end using a hot-melt welding device. Step 6: Introduce steam through the gas channel on the inner liner tube reel to heat and soften the rounded end face of the welded inner liner tube. Then, perform a second pulling of the inner liner tube. The inner liner tube is squeezed by a pressure roller device to form an I-shaped cross-section. Continue pulling the inner liner tube into the pipe to be repaired, repeating steps 4 and 5 until the pulled inner liner tube reaches the repair length of the broken pipe. Step 7: Perform [further steps on] the I-shaped cross-section inner liner tube that has entered the pipe to be repaired. Restoration; After locally heating and softening both ends of the inner liner, insert air plugs and introduce steam into the inner liner through the air plugs. After the inner liner softens, stop steam heating; then introduce other gases into the inner liner through the air plugs to pressurize it until the inner liner is tightly attached to the original pipeline; after maintaining the pressure for a certain period of time, convert the steam into cold air to cool the inner liner; Step 7: After the inner liner cools down, remove the air plugs and fold the ends of the inner liner at both ends of the pipeline to be repaired; fold the inner liner onto the previously installed flange; Step 8: Pipe break restoration: Connect the broken pipe using a flanged broken pipe and an expansion joint.

8. A trenchless repair method for buried water supply pipelines according to claim 7, characterized in that: In step 1, sheet piles are used for support after the pipe is cut; and the length of the cut pipe is set at 2m-3m.

9. A trenchless repair method for buried water supply pipelines according to claim 7, characterized in that: In step 1, the cleaning vehicle is cleaned using ultra-high pressure water cleaning, mechanical cleaning, or sandblasting.

10. A trenchless repair method for buried water supply pipelines according to claim 7, characterized in that: The inflation plug has a vent hole and an inflation hole in the middle; the vent hole is used to connect to the steam softening liner tube; the inflation hole is used to introduce pressurized gas into the inflation plug.

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