A pipe puller for natural gas energy pipeline butt joint repair and a use method thereof

Abstract

The application discloses a pipe puller for butt joint repair of natural gas energy pipelines, which comprises a fixed clamp assembly, a rack assembly, a ratchet wrench assembly and a pipe clamp assembly. The rack assembly can be connected with the fixed clamp assembly. The ratchet wrench assembly on the pipe clamp assembly can drive the pipe clamp assembly to move linearly on the rack assembly. The fixed clamp assembly and the pipe clamp assembly are fixed, and then the rack assembly and the capacitor sleeve are fixed, so that a structure in which the rack and the capacitor sleeve move simultaneously is formed. The damaged gas pipeline and the sleeve can be butt jointed through the fixed clamp assembly, the rack assembly and the pipe clamp assembly. The installation of the sleeve adopts the ratchet wrench assembly, so that the operation is convenient, labor-saving and safe, and the risk of safety accidents caused by traditional manual hammering can be avoided.

Description

Technical Field

[0001] This invention relates to the field of pipeline connection and repair construction technology, specifically to a pipe puller for emergency repair of natural gas energy pipeline connections and its usage method. Background Technology

[0002] Natural gas pipelines are pipelines that transport natural gas (including associated gas produced from oil fields) from extraction sites or processing plants to urban gas distribution centers or industrial users; they are also known as gas transmission pipelines.

[0003] When a gas pipeline that is already in use is damaged by external forces, flammable and explosive gases inside the pipeline may leak, which is extremely dangerous and requires immediate repair.

[0004] Current emergency repair methods typically involve sealing off the gas supply side of the pipeline, cutting off the gas pipeline at the leak point, installing a sleeve and adjusting it to the appropriate position, and finally heat-fusion. During the sleeve installation and adjustment process, manual hammering is primarily used, which is difficult to perform. In particular, the vibration generated by hammering can easily cause the seal to leak again. In past on-site operations, this method has resulted in accidents where workers were directly injured or killed by explosions.

[0005] Currently, there is a lack of a lightweight, safe, and effective emergency repair device for on-site repairs of pressurized gas pipelines. Summary of the Invention

[0006] (a) Technical problems to be solved To address the problems existing in the background technology, this invention designs a pipe puller and its usage method for emergency repair of natural gas energy pipelines. It can realize emergency repair work under gas pressure and can ensure temporary gas supply to downstream areas through bypass pipelines during emergency repairs. Moreover, the device is lightweight and can meet the needs of rapid installation of different capacitor bushing lengths and diameters, achieving fast, convenient and safe emergency repair results.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A pipe puller for emergency repair of natural gas energy pipelines, characterized in that it includes: a fixing clamp assembly, the fixing clamp assembly including two fixing clamp bodies, a fixing clamp channel formed between the two fixing clamp bodies, end plates fixedly connected to the upper and lower ends of the fixing clamp bodies, the end plates being provided with screw holes and / or through holes, ear plates fixedly connected to the outer contour of the fixing clamp bodies, the ear plates being provided with slots, the slots being used in conjunction with a rack and pinion assembly; The rack assembly includes a rack segment, a connecting rod, and a second end plate. One end of the rack segment is fixedly connected to one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the second end plate. A movable groove is formed between the second end plate and one end of the rack segment. The movable groove cooperates with a retaining groove. The rack segment is movably connected to a pipe clamp assembly. The pipe clamp assembly includes a ratchet wrench assembly, a pipe clamp short plate, and a pipe clamp long plate. The pipe clamp short plate, the pipe clamp long plate, and the base plate form a rack movable groove. The rack movable groove is used for the rack assembly to reciprocate within it. Pipe clamp end plates are fixed to both ends of the pipe clamp long plate. A sleeve mounting groove is formed between the two pipe clamp end plates. The ratchet wrench assembly is fixed between the pipe clamp short plate and the pipe clamp long plate via a spline shaft. The ratchet wrench assembly includes a handle, a ratchet wrench housing, and a gear. The handle is welded and fixed to the ratchet wrench housing. The ratchet wrench housing is fixed between the short plate and the long plate of the pull pipe clamp via the spline shaft. A gear is provided inside the ratchet wrench housing. The gear is mounted on the spline shaft and meshes with the rack segment, controlling the rack segment to reciprocate in the rack's movable groove.

[0008] As a preferred embodiment of the previous step, the fixing clamp body is a semi-circular pipe shape, and the two fixing clamp bodies are locked and fixed by locking screws through the through hole and / or screw hole. The fixing clamp channel formed between the two fixing clamp bodies is used to clamp and fix the first pipe and the second pipe.

[0009] As a preferred embodiment of the previous step, an extension section and a first end plate are added between the rack section and the connecting rod. One end of the extension section is fixedly connected to the rack section, and the other end is fixedly connected to one side of the first end plate. The other side of the first end plate is fixedly connected to one end of the connecting rod.

[0010] As a preferred embodiment of the previous step, the ratchet wrench housing is symmetrically provided with two sets of pawls and two second springs. One end of the second spring is connected to the inner wall of the ratchet wrench housing, and the other end is connected to the pawl, pushing the pawl out so that the tip of the pawl abuts against the gear teeth.

[0011] As a preferred embodiment of the previous step, a paddle is provided between the two sets of pawls. The paddle is installed inside the ratchet wrench housing and is used to control the contact and separation between the pawls on both sides and the gear teeth.

[0012] As a preferred embodiment of the previous step, the paddle controls one pawl to engage with the gear teeth, and the lever is turned to rotate the gear in one direction. The paddle also controls the other pawl to engage with the gear teeth, and the lever is turned to rotate the gear in the other direction, thereby causing the pipe clamp assembly to move left and right on the rack assembly.

[0013] As a preferred embodiment of the previous step, the top of the pull-tube clamp plate is also provided with a pull strap ring, which is used to assist the bandage in passing through and fixing. The bandage is provided with Velcro, and after fixing, the bandage suspends the pull-tube clamp assembly on the capacitor sleeve through the pull strap ring.

[0014] As a preferred embodiment of the previous step, the long end of the pull-tube clamp plate is provided with a movable groove, the inner side of the movable groove is provided with a step, and a movable clamp plate that is slidably connected is provided in the movable groove. The movable clamp plate has a convex structure, and the convex surface of the movable clamp plate is fixed to the side plate by screws. The side plate and the step are slidably connected.

[0015] As a preferred embodiment of the previous step, the movable clamping plate is provided with a positioning post and / or a flexible clamp, which is used to hold the capacitor sleeve on the tube clamping assembly. A sleeve rod is provided on the same side of the protruding surface of the movable clamping plate and the positioning post. The sleeve rod is used to install and limit the first spring. A pressure plate is fixed on the long end face of the tube clamping plate. The pressure plate is provided with a threaded through hole. A matching adjusting screw is provided in the threaded through hole. The adjusting screw passes through the pressure plate to push the movable clamping plate to move and position. Multiple flexible clamping heads are provided on the flexible clamp. The flexible clamping heads retract into the flexible clamp after being subjected to pressure.

[0016] A method for using a pipe puller for emergency repair of natural gas pipeline connections includes the following steps: 1) Install pressurized sealing heads on the first and second pipes at the ends of the natural gas pipeline at positions where the pipe puller's stroke length is sufficient. Seal the sealing heads inside the first and second pipes. Use the vent valve of the sealing device to vent the sealed first and second pipes. After confirming that there is no leakage, the sealing is deemed qualified. Install a bypass pipe on the sealing device and open the bypass valve to temporarily supply gas to the downstream. Cut off the damaged pipe section between the first and second pipes, keeping the cross-section flush with an upper and lower deviation of no more than 0.5 mm. Cut the pipe at a distance of no less than 1 cm from both ends of the damage point. Measure the length of the damaged pipe section and cut off the third pipe. Evenly scrape off 0.1-0.2 mm of oxide layer from the surface of the first and second pipes according to the length of the capacitor sleeve to be installed. Chamfer and remove burrs. Clean the surface with alcohol. Mark the welding positioning lines of the piping and main pipe. 2) Install the pipe puller at an appropriate travel position. Fix the fixing clamp assembly at an appropriate position on the first pipe with the locking screw. Combine the two sets of rack assemblies and the pipe puller assembly. Adjust the position of the paddle and operate the handle to move the pipe puller assembly to the rack section away from the extension section. Then, insert the movable slot of the other end of the rack assembly into the slot of the fixing clamp assembly. 3) Install the capacitor sleeve between the two pipe clamp assemblies. Select the corresponding electrofusion sleeve caliper. The end of the capacitor sleeve that is being pulled is clamped onto the positioning post on the inner side of the pipe clamp end plate on the pipe clamp long plate. Use an auxiliary bandage to pass through the pull ring at the top of the pipe clamp long plate to keep the two sets of pipe clamp assemblies horizontal. The bandage has Velcro. After fixing, the bandage hangs the pipe clamp assembly on the capacitor sleeve through the pull ring. Adjust the lever in the opposite direction. Two people operate the control handle at the same speed to put the capacitor sleeve on the pipe clamp assembly into the outer wall of the first and second pipes until it is roughly flush with the cut surface of the first and second pipes. 4) After the capacitor sleeve is fully fitted onto the first and second tubes, place the third tube between the first and second tubes, keeping it approximately coaxial with the first and second tubes; 5) Adjust the lever in the opposite direction again. Both people operate the control handle at the same speed and operate the ratchet wrench assembly on the pipe clamp assembly. Drive the pipe clamp assembly to move towards the middle of the third tube on the rack assembly. The moving distance is about half the length of the capacitor sleeve. This completes the two capacitor sleeves on the first and third tubes and the third and second tubes. At this time, the joint of the first and third tubes and the third and second tubes is roughly at the center of the capacitor sleeve axis. 6) Disassemble this device and check whether the capacitor sleeve, the third tube, the first tube, and the second tube are concentric and coaxial, and whether the welding positioning line is flush. After confirming that everything is correct, electrofusion welding is performed on both ends of the damaged point. During the welding process, it is forbidden to apply external force to the welded tube section. Then, the two capacitor sleeve sections are heat-fused to complete the sealing connection between the first tube, the capacitor sleeve, the third tube, and the second tube. The welding time, voltage, and cooling time parameters are set according to the tube diameter and material. After cooling, the capacitor sleeve is welded and checked to see if: there is any molten material flowing out, the resistance wire of the electrofusion sleeve is leaking out, and the positioning line is flush. 7) After confirming that the welding is correct, open the sealing valves on the first and second pipes, replace the welded pipe section with natural gas, and maintain the pressure. During the pressure maintenance process, conduct leak detection on the weld points. After the pressure maintenance and detection are qualified, remove the sealing equipment, restore gas supply to the site, backfill the earthwork, and the construction is completed.

[0017] This invention provides a pipe puller for emergency repair of natural gas pipeline connections and its usage method, which has the following beneficial effects: 1. The product of this invention can connect damaged gas pipelines and sleeves through a fixing clamp assembly, a rack assembly, and a pipe clamp assembly. The sleeve is installed using a ratchet wrench assembly, which is convenient, labor-saving, and safe, avoiding the safety risks caused by traditional manual hammering.

[0018] 2. The product of this invention uses a ratchet wrench assembly to fix the sleeve, and the ratchet wrench assembly drives the pipe clamp assembly to reciprocate on the rack assembly 2, thereby moving the sleeve. This structural design, in which the pipe clamp assembly and the sleeve move together, allows for a smaller overall structural size and reduces the requirements for on-site excavation of foundation tunnels.

[0019] 3. The auxiliary bandage and positioning post of the present invention can easily fix the sleeve, making it more stable when installing the sleeve.

[0020] 4. In order to meet the installation and fixing of sleeves of different lengths, the product of this invention adopts a structural design of movable clamps, which eliminates the need to customize different length specifications and makes the product highly adaptable.

[0021] 5. In order to meet the installation and fixing of sleeves of different diameters, the product of this invention adopts a flexible clamp structure design, which eliminates the need to customize different diameter specifications, making fixing more convenient and the product highly adaptable.

[0022] 6. The product of this invention has a simple structure, allowing for construction under conditions of gas outage and gas pressure with minimal impact. It is easy to process, manufacture, and promote, effectively solving the major problem of emergency repair of gas pipeline leaks and improving the efficiency and safety of emergency repair work. Attached Figure Description

[0023] Figure 1 This is a front view of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the fixing clip structure according to Embodiment 1 of the present invention.

[0024] Figure 3 This is a schematic diagram of the pipe clamp assembly structure according to Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the rack and pinion assembly structure according to Embodiment 1 of the present invention.

[0026] Figure 5 This is a schematic diagram of the pipe clamp structure according to Embodiment 1 of the present invention.

[0027] Figure 6 This is a partial cross-sectional view of the pipe clamp assembly according to Embodiment 1 of the present invention.

[0028] Figure 7 This is a schematic diagram of the pipe clamp assembly in Embodiment 2 of the present invention.

[0029] Figure 8 This is a schematic diagram of the installation of the movable clamping plate in Embodiment 2 of the present invention.

[0030] Figure 9 This is a schematic diagram of the movable clamping plate structure in Embodiment 2 of the present invention.

[0031] Figure 10 This is a schematic diagram of the flexible clamp structure in Embodiment 3 of the present invention.

[0032] Figure 11 This is a schematic diagram of the sleeve clamping in Embodiment 3 of the present invention.

[0033] Figure 12 For the present invention Figure 11 AA view.

[0034] Figure 13 This is a diagram showing the original pipe blockage and disconnection state in Embodiment 1 of the present invention.

[0035] Figure 14 This is a diagram showing the initial installation state of the fixing clip according to Embodiment 1 of the present invention.

[0036] Figure 15 This is a diagram showing the installation state of the pipe clamp in Embodiment 1 of the present invention.

[0037] Figure 16 This is a diagram showing the state of the entire sleeve being moved by the pipe clamp according to Embodiment 1 of the present invention.

[0038] Figure 17 This is a diagram showing the state of the sleeve when the pipe clamp is retracted halfway in Embodiment 1 of the present invention.

[0039] Figure 18 This is a diagram showing the completed installation of a set of pipes according to an embodiment of the present invention.

[0040] The components include: 1. Fixing clamp assembly; 2. Rack assembly; 3. Ratchet wrench assembly; 4. Pipe clamp assembly; 5. First tube; 6. Capacitor sleeve; 7. Third tube; 8. Second tube; 9. Auxiliary bandage; 10. Fixing clamp body; 11. Screw hole; 12. Through hole; 13. Slot; 14. Ear plate; 15. Locking screw; 16. Fixing clamp channel. 17. End plate; 18. Sleeve rod; 19. First spring; 20. Rack section; 21. Extension section; 22. First end plate; 23. Connecting rod; 24. Second end plate; 25. Movable groove; 26. Movable clamping plate; 27. Side plate; 28. Adjusting screw; 29. ​​Movable groove; 30. Handle; 31. Ratchet wrench housing; 32. Pawl; 33. Paddle; 34. Second spring; 35. Gear; 36. Pressure plate; 37. Guide rail; 38. Flexible clamp head; 39. Flexible clamp; 40. Pull pipe clamp short plate; 43. Pull belt ring; 44. Pull pipe clamp end plate; 45. Positioning post; 46. Spline shaft; 47. Sleeve mounting groove; 48. Rack movable groove; 49. Pull pipe clamp long plate. Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0042] like Figure 1 As shown, a pipe puller for emergency repair of natural gas pipelines includes: a fixing clamp assembly 1, a rack assembly 2, a ratchet wrench assembly 3, and a pipe puller assembly 4. The rack assembly 2 can be inserted into the fixing clamp assembly 1. The ratchet wrench assembly 3 on the pipe puller assembly 4 can drive the pipe puller assembly 4 to move linearly on the rack assembly 2. The fixing clamp assembly 1 is fixed to the pipe puller assembly 4, and then the rack assembly 2 is fixed to a capacitor sleeve 6, forming a structure in which the rack and capacitor sleeve 6 move simultaneously. However, to save construction space and meet product structural size requirements, the structure shown in the figure is preferred.

[0043] like Figure 2 As shown, the fixing clamp assembly 1 of this application consists of two fixing clamp bodies 10 used together. The fixing clamp body 10 is a semi-circular pipe shape. The upper and lower sides of the fixing clamp body 10 are provided with end plates 17. In a preferred embodiment, the end plates 17 are welded to the fixing clamp body 10. The end plates 17 are provided with screw holes 11 and / or through holes 12. The locking screws 15 can pass through the through holes 12 and cooperate with the screw holes 11 to lock and fix the two fixing clamp bodies 10. A fixing clamp channel 16 is formed between the two fixing clamp bodies 10. The fixing clamp channel 16 is used to clamp and fix the first pipe 5 and the second pipe 8. The outer contour of the fixing clamp body 10 is provided with ear plates 14. In a preferred embodiment, the ear plates 14 are welded and fixed to the outer surface of the fixing clamp body 10. The ear plates 14 are provided with slots 13. The slots 13 are used to cooperate with the rack assembly 2.

[0044] like Figure 3-5 As shown, the rack assembly 2 of this application includes a rack segment 20, an extension segment 21, a first end plate 22, a connecting rod 23, and a second end plate 24. The first end plate 22 and the second end plate 24 are connected by the connecting rod 23 to form a movable groove 25. The movable groove 25 is used in conjunction with the slot 13 on the ear plate 14 for easy assembly and disassembly. An extension segment 21 is welded between the second end plate 24 and the rack segment 20. The extension segment 21 is made of square tubing to avoid using the same solid, high-strength material as the rack segment 20, which can reduce the overall structural weight and material cost. The rack assembly 2 can move linearly within the pipe clamp assembly 4. The rack segment 20 is used in conjunction with the ratchet wrench assembly 3 on the pipe clamp assembly 4.

[0045] The pipe clamp assembly 4 of this application includes a ratchet wrench assembly 3, a short pipe clamp 40, a pipe clamp end plate 44, a positioning post 45, a spline shaft 46, and a long pipe clamp 49. The short pipe clamp 40, the long pipe clamp 49, and the base plate (not marked in the diagram) form a U-shaped cross-section. A rack and pinion groove 48 is formed inside the U-shaped structure to facilitate the movement of the rack and pinion assembly 2 within the groove. A pull strap ring 43 is also provided at the top of the long pipe clamp 49. The pull strap ring 43 is used to assist the bandage 9 in passing through and fixing it. Pull-tube clamp end plates 44 are fixed to both ends of plate 49. Positioning posts 45 are arranged in a straight line on the inner side of the pull-tube clamp end plates 44. The two pull-tube clamp end plates 44 form a sleeve mounting groove 47. The sleeve mounting groove 47 is used to install the capacitor sleeve 6. The pull-tube clamp end plates 44 are used to push the capacitor sleeve 6 to move. The positioning posts 45 can penetrate into the inner hole of the capacitor sleeve 6 to initially fix the capacitor sleeve 6 so that it will not fall off. The ratchet wrench assembly 3 is fixed between the pull-tube clamp short plate 40 and the pull-tube clamp long plate 49 through the spline shaft 46.

[0046] like Figure 6 As shown, the ratchet wrench assembly 3 of this application includes a handle 30, a ratchet wrench housing 31, a pawl 32, a paddle 33, a second spring 34, and a gear 35. The handle 30 is welded and fixed to the ratchet wrench housing 31. The ratchet wrench housing 31 is fixed inside the pull tube clamp assembly 4 via a splined shaft 46. A gear 35 is provided inside the ratchet wrench housing 31 and is mounted on the splined shaft 46. The gear 35 meshes with the rack segment 20 of the rack assembly 2. Two sets of pawls 32 and a second spring 34 are symmetrically arranged inside the ratchet wrench housing 31. The second spring 34 can push out the pawls 32 so that the top of the pawls 32 abuts against the teeth of the gear 35. The paddle 33 is installed inside the ratchet wrench housing 31. The paddle 33 can control the engagement and disengagement of the pawls 32 on both sides with the gear teeth 35. That is, by controlling one pawl 32 to engage with the gear teeth 35, turning the handle 30 left or right will drive the gear 35 to rotate in one direction. Similarly, the paddle 33 controls the other pawl 32 to engage with the gear teeth 35, so turning the handle 30 left or right will drive the gear 35 to rotate in the other direction. Ultimately, this will drive the pull tube clamp assembly 4 to move left and right on the rack assembly 2. Example

[0047] like Figures 7-9As shown, in order to meet the installation requirements of capacitor sleeves 6 of different lengths, a movable groove 29 is provided at the long end of the pull-tube clamp plate 49. A step 37 is formed between the movable grooves 29. The step 37 is stepped, which facilitates the movement of the movable clamp plate 26 in the movable groove 29. The movable clamp plate 26 is convex. The convex surface of the movable clamp plate 26 is fixed to the side plate 27 by screws and can move in the movable groove 29. A positioning post 45 is provided on the movable clamp plate 26. The positioning post 45 is used to be locked inside the capacitor sleeve 6 and to assist in fixing it to the pull-tube clamp assembly 4. A sleeve rod 18 is provided on the same side of the convex surface of the movable clamp plate 26 and the positioning post 45. The sleeve rod 18 is used to install the first spring 19 and to limit the movement. A pressure plate 36 is fixed on the long end face of the pull-tube clamp plate 49. The pressure plate 36 is provided with a threaded through hole. The adjusting screw 28 passes through the pressure plate 36 to push the movable clamp plate 26 to move and achieve real-time positioning. Example

[0048] like Figures 10-12 As shown, in order to meet the clamping and fixing requirements of capacitor sleeves 6 of different diameters on the tube clamp assembly 4 and to avoid large deviations when pulling the sleeves, the positioning post 45 can be replaced with a flexible clamp 39. The flexible clamp 39 is provided with dense flexible clamp heads 38. The flexible clamp heads 38 can retract into the flexible clamp 39 when subjected to pressure, and can pop out again when no external force is applied. The flexible clamp heads 38 can adapt well to the size of capacitor sleeves 6 of different diameters, making it convenient to fix the capacitor sleeves 6 from both ends.

[0049] like Figures 13-18 As shown, 1) Install pressurized sealing devices at appropriate positions on the first pipe 5 and the second pipe 8 at both ends of the natural gas pipeline rupture point, leaving sufficient travel length for the pipe puller. Place the sealing head inside the first pipe 5 and the second pipe 8, completely sealing them. Use the vent valve of the sealing device to vent the sealed first pipe 5 and the second pipe 8. After checking for leaks, the sealing is deemed qualified. Install a bypass pipe on the sealing device and open the bypass valve to temporarily supply gas downstream, achieving uninterrupted operation. Cut off the damaged pipe section between the first pipe 5 and the second pipe 8, keeping the cross-section flush, with an upper and lower deviation not exceeding 0.5 mm. Cut the pipe at a distance of not less than 30 cm from both ends of the rupture point, measure the length of the damaged pipe section, and cut off the third pipe 7. Evenly scrape off 0.1-0.2 mm of oxide layer from the surface of the first pipe 5 and the second pipe 8 according to the length of the capacitor sleeve 6 installation, chamfer and remove burrs, clean the surface with alcohol, and mark the positioning lines for the piping and main pipe welding. (e.g.) Figure 13 ) 2) Install the pipe puller at an appropriate travel position, and fix the fixing clamp assembly 1 at the appropriate position on the first pipe 5 using the locking screw 15. Combine the two sets of rack assemblies 2 and the pipe puller assembly 4: adjust the correct position of the lever 32, operate the handle 30, and move the pipe puller assembly 4 to the end of the rack section 20 away from the extension section 21. Then, insert the movable slot 25 of the other end of the rack assembly 2 into the slot 13 of the fixing clamp assembly 1. (e.g.) Figure 14 ) If there are two devices, they can be installed symmetrically on the first tube 5 and the second tube 8 at the same time.

[0050] 3) Install the capacitor sleeve 6 between the two pipe clamp assemblies 4, selecting the corresponding electrofusion sleeve 6 caliper. The pulled end of the capacitor sleeve 6 is clamped onto the positioning post 45 on the inner side of the pipe clamp end plate 44 on the pipe clamp long plate 49. Use the auxiliary bandage 9 to pass through the pull loop 43 at the top of the pipe clamp long plate 49 to keep the two sets of pipe clamp assemblies 4 horizontal. The bandage 9 has Velcro; after fixing, the bandage 9 suspends the pipe clamp assembly 4 on the capacitor sleeve 6 through the pull loop 43. Adjust the lever 32 in the opposite direction, and have two people operate the control handle 30 at a uniform speed to fit the capacitor sleeve 6 on the pipe clamp assembly 4 onto the outer wall of the first pipe 5 and the second pipe 8 until it is roughly flush with the cut surface of the first pipe 5 and the second pipe 8. (e.g.) Figure 15 ) 4) After the capacitor sleeve 6 is fully fitted onto the first tube 5 and the second tube 8, place the third tube 7 between the first tube 5 and the second tube 8, ensuring it is approximately coaxial with the first tube 5 and the second tube 8. (e.g.) Figure 16 ) 5) Adjust the lever 32 in the opposite direction again. Two people simultaneously operate the constant-speed control handle 30, operating the ratchet wrench assembly 3 on the pipe clamp assembly 4. This drives the pipe clamp assembly 4 to move towards the middle of the third tube 7 from the rack assembly 2, moving approximately half the length of the capacitor sleeve 6. This completes the connection between the two capacitor sleeves 6 on the first tube 5 and the third tube 7, and the second tube 8. At this point, the joint between the first tube 5 and the third tube 7, and the second tube 8, is roughly at the axial center of the capacitor sleeve 6. (e.g.) Figure 17 ) 6) Disassemble this device and check whether capacitor sleeve 6, the third tube 7, and the first tube 5 and second tube 8 are concentric and coaxial, and whether the welding positioning lines are aligned. After confirming that everything is correct, perform electrofusion welding on both ends of the damaged point. During the welding process, it is forbidden to apply external force to the welded tube section. Then, perform heat fusion treatment on the two capacitor sleeve sections 6 to complete the sealed connection between the first tube 5, capacitor sleeve 6, third tube 7, and second tube 8. The welding time, voltage, cooling time, and other parameters are set according to the tube diameter and material. After cooling, perform a welding inspection on capacitor sleeve 6 (whether there is any molten material flowing out, whether the resistance wire of electrofusion sleeve 6 is leaking, and whether the positioning lines are aligned). (e.g.) Figure 18 ) 7) After confirming that the welding is correct, open the sealing valves on pipe 5 and pipe 8, and replace the welded pipe section with natural gas and maintain pressure. During the pressure maintenance process, perform leak detection on the weld points (using foam water and a combustible gas detector). After the pressure maintenance and detection are passed, remove the sealing equipment, restore gas supply to the site, backfill the earthwork, and the construction is completed.

[0051] To facilitate the installation of capacitor bushings 6 of different lengths and diameters, the structure of Embodiment 2, Embodiment 3, or a combination of both in this technical solution can be adopted.

[0052] The above achieves the design objective.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. In summary, the invention achieves its intended purpose.

Claims

1. A method for using a pipe puller for emergency repair of natural gas energy pipelines, characterized in that, The following usage steps are included: 1) Install sealing valves at the positions where the pipe puller stroke length is left on the first pipe (5) and the second pipe (8) at both ends of the natural gas pipeline damage point. Close the valve inside the sealing valve to seal the first pipe (5) and the second pipe (8). Use the vent valve of the sealing valve to vent the sealed first pipe (5) and the second pipe (8). After checking for no leakage, confirm that the sealing is qualified. Install a bypass pipe on the sealing valve and open the bypass valve to temporarily supply gas to the downstream. Cut off the damaged pipe section between the first pipe (5) and the second pipe (8), keep the cross-section flush, and the vertical deviation is not greater than 0.5 mm. Cut the pipe at a distance of not less than 30 cm from both ends of the damage point. Measure the length of the damaged pipe section and cut off the third pipe (7). According to the length of the electrofusion sleeve (6), scrape off the oxide layer of the first pipe (5) and the second pipe (8) by 0.1-0.2 mm evenly. Chamfer and remove burrs. Clean the surface with alcohol. Mark the positioning lines for the piping and the main pipe welding. 2) Install the pipe puller at the appropriate stroke position, and fix the fixing clamp assembly (1) at the appropriate position of the first pipe (5) by locking screw (15). Combine the two sets of rack assemblies (2) and the pipe puller assembly (4), adjust the position of the lever (33), operate the handle (30), and move the pipe puller assembly (4) to one end of the rack segment (20) away from the extension section (21). Then, insert the first movable groove (25) located at the other end of the rack assembly (2) into the slot (13) of the fixing clamp assembly (1). The rack assembly (2) includes a rack segment (20), a connecting rod (23), and a second end plate (24). One end of the rack segment (20) and the connecting rod (23) One end is fixedly connected, the other end of the connecting rod (23) is fixedly connected to the second end plate (24), and a first movable groove (25) is formed between the second end plate (24) and one end of the rack section (20). The first movable groove (25) and the slot (13) cooperate with each other. The rack section (20) is movably connected to the pipe clamp assembly (4). An extension section (21) and a first end plate (22) are added between the rack section (20) and the connecting rod (23). One end of the extension section (21) is fixedly connected to the rack section (20), and the other end is fixedly connected to one side of the first end plate (22). The other side of the first end plate (22) is fixedly connected to one end of the connecting rod (23). 3) Install the electrofusion sleeve (6) between the two pipe clamp assemblies (4). Select an electrofusion sleeve (6) of the corresponding size and clamp the electrofusion sleeve (6) onto the positioning post (45) and / or flexible clamp (39) on the inner side of the pipe clamp end plate (44) and movable clamp plate (26). Rotate the adjusting screw (28) to fix the electrofusion sleeve (6). Then, use an auxiliary bandage (9) to pass through the pull strap ring (43) at the top of the pipe clamp long plate (49) to hold the two sets of pipe clamp assemblies (4). The bandage (9) has Velcro attached. After fixing, the bandage (9) fixes the pipe clamp assembly (4) to the electrofusion sleeve (6) through the pull ring (43) to prevent the pipe clamp assembly (4) from loosening or falling off during the pulling process. Adjust the lever (33) in the opposite direction and operate the control handle (30) at the same speed to put the electrofusion sleeve (6) on the pipe clamp assembly (4) into the outer wall of the first pipe (5) and the second pipe (8) until it is flush with the cut surface of the first pipe (5) and the second pipe (8). 4) After the electrofusion sleeve (6) is fully fitted onto the first tube (5) and the second tube (8), place the third tube (7) between the first tube (5) and the second tube (8) and keep it coaxial with the first tube (5) and the second tube (8); 5) Adjust the lever (33) again in the opposite direction. The two people operate the control handle (30) at the same speed. Operate the ratchet wrench assembly (3) on the pipe clamp assembly (4) to drive the pipe clamp assembly (4) to move the electrofusion sleeve (6) towards the center position of the third pipe (7) along the rack assembly (2). The moving distance is half the length of the electrofusion sleeve (6). One electrofusion sleeve (6) is used to initially fix one end of the first pipe (5) and the third pipe (7), and the other electrofusion sleeve (6) is used to initially fix the other end of the second pipe (8) and the third pipe (7). At this time, the joint of the first pipe (5) and the third pipe (7), and the third pipe (7) and the second pipe (8) are at the center position of the electrofusion sleeve (6) in the axial direction. 6) Remove this device and check whether the electrofusion sleeve (6) is concentric and coaxial with the first tube (5), the third tube (7), and the second tube (8). Confirm whether the welding position of the end face of the electrofusion sleeve (6) is offset. After confirming that there is no error, electrofusion welding is performed on both ends of the damaged point. During the welding process, it is forbidden to apply external force to the welded pipe section. Then, the two electrofusion sleeve (6) sections are heat-fused to complete the sealing connection between the first tube (5), the electrofusion sleeve (6), the third tube (7), and the second tube (8). During welding, the corresponding welding time, voltage, and cooling time parameters are set according to the pipe diameter and material. After cooling, the electrofusion sleeve (6) is welded and inspected: whether there is any molten material flowing out, whether the resistance wire of the electrofusion sleeve (6) is leaking out, and whether the electrofusion sleeve (6) is in the predetermined welding position. 7) After confirming that the welding inspection is correct, open the sealing valves on the first pipe (5) and the second pipe (8), replace the welded pipe section with natural gas, and maintain the pressure. During the pressure maintenance process, conduct leakage detection on the welding point. After the pressure maintenance and detection are qualified, remove the sealing equipment, restore the gas supply to the site, backfill the earthwork, and the construction is completed.

2. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 1, characterized in that, The pipe puller includes: a fixing clamp assembly (1), the fixing clamp assembly (1) includes two fixing clamp bodies (10), a fixing clamp channel (16) is formed between the two fixing clamp bodies (10), and end plates (17) are fixedly connected to the upper and lower ends of the fixing clamp bodies (10). The end plates (17) are provided with screw holes (11) and / or through holes (12). Ear plates (14) are fixedly connected to the outer contour of the fixing clamp bodies (10). The ear plates (14) are provided with slots (13). The slots (13) are used to cooperate with the rack assembly (2). The pipe clamp assembly (4) includes a ratchet wrench assembly (3), a pipe clamp short plate (40), and a pipe clamp long plate (49). The pipe clamp short plate (40), the pipe clamp long plate (49), and the base plate form a rack movable groove (48). The rack movable groove (48) is used for the rack assembly (2) to move back and forth within it. Both ends of the pipe clamp long plate (49) are fixed with pipe clamp end plates (44). The two pipe clamp end plates (44) form a sleeve mounting groove (47). The ratchet wrench assembly (3) is fixed between the pipe clamp short plate (40) and the pipe clamp long plate (49) through a spline shaft (46). The ratchet wrench assembly (3) includes a handle (30), a ratchet wrench housing (31), and a gear (35). The handle (30) is welded and fixed to the ratchet wrench housing (31). The ratchet wrench housing (31) is fixed between the short plate (40) and the long plate (49) of the pull pipe clamp via the spline shaft (46). The ratchet wrench housing (31) is provided with a gear (35), which is mounted on the spline shaft (46). The gear (35) meshes with the rack segment (20), and the rack segment (20) reciprocates in the rack movable groove (48).

3. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 2, characterized in that, The fixing clamp body (10) is a semi-circular pipe shape. The two fixing clamp bodies (10) are locked and fixed by the locking screw (15) through the through hole (12) and / or screw hole (11). The fixing clamp channel (16) formed between the two fixing clamp bodies (10) is used to clamp and fix the first tube (5) and the second tube (8).

4. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 3, characterized in that, The ratchet wrench housing (31) is symmetrically provided with two sets of pawls (32) and two second springs (34). One end of the second spring (34) is connected to the inner wall of the ratchet wrench housing (31), and the other end is connected to the pawl (32) and pushes the pawl (32) out so that the top of the pawl (32) abuts against the teeth of the gear (35).

5. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 4, characterized in that, A paddle (33) is provided between the two sets of pawls (32). The paddle (33) is installed inside the ratchet wrench housing (31). The paddle (33) is used to control the contact and separation of the pawls (32) on both sides with the gear teeth (35).

6. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 5, characterized in that, The paddle (33) controls one pawl (32) to engage with the teeth of the gear (35), and the lever (30) drives the gear (35) to rotate in one direction. The paddle (33) controls the other pawl (32) to engage with the teeth of the gear (35), and the lever (30) drives the gear (35) to rotate in another direction, thereby causing the pipe clamp assembly (4) to move left and right on the rack assembly (2).

7. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 6, characterized in that, The top of the tube clamp plate (49) is also provided with a pull strap ring (43), which is used to assist the bandage (9) in passing through the fixing. The bandage (9) is provided with Velcro. After fixing, the bandage (9) fixes the tube clamp assembly (4) to the electrofusion sleeve (6) through the pull strap ring (43).

8. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 7, characterized in that, The long end of the pull-tube clamp plate (49) is provided with a second movable groove (29), and a step (37) is provided on the inner side of the second movable groove (29). A movable clamp plate (26) is provided in the second movable groove (29) and is slidably connected. The movable clamp plate (26) has a convex structure. The protruding surface of the movable clamp plate (26) is fixed to the side plate (27) by screws. The side plate (27) and the step (37) are slidably connected.

9. The method of using a pipe puller for emergency repair of natural gas energy pipelines according to claim 8, characterized in that, The movable clamping plate (26) is provided with a positioning post (45) and / or a flexible clamp (39). The positioning post (45) and / or the flexible clamp (39) are used to clamp the electrofusion sleeve (6) onto the pipe clamp assembly (4). A sleeve rod (18) is provided on the same side of the protruding surface of the movable clamping plate (26) and the positioning post (45). The sleeve rod (18) is used to install and limit the first spring (19). A pressure plate (36) is fixed on the long end face of the pipe clamp long plate (49). The pressure plate (36) is provided with a threaded through hole. A matching adjusting screw (28) is provided in the threaded through hole. The adjusting screw (28) passes through the pressure plate (36) to push the movable clamping plate (26) to move and position. Multiple flexible clamp heads (38) are provided on the flexible clamp (39). The flexible clamp heads (38) retract into the flexible clamp (39) after being pressured.

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