Coaxial pipe pulling and clamping device and pipe butt joint method thereof

Abstract

The application provides a coaxial pipeline traction clamping device and a pipeline butt joint method thereof, and relates to the traction device field.The device is assembled by left and right traction clamping devices which are mirror images;each set of traction clamping device comprises a pipeline welding butt joint device, a hydraulic jacking back steel ring and a hydraulic jack;the pipeline welding butt joint device is provided with an annular iron, a fastening screw rod, a slide rail fixed steel ring, a detachable locking device and a jack iron;the hydraulic jacking back steel ring is provided with a slide rail fixed steel ring and a jack placing device;the back steel ring and the slide rail are locked to serve as supports, and the butt joint device can slide along the slide rail.The construction method comprises device preparation, pipeline hoisting and positioning, device installation, slide rail installation, hydraulic jacking and welding and dismounting.The application realizes high-precision coaxial butt joint of high-altitude suspended pipeline, and the hydraulic traction is stable and controllable, slipping is avoided, the device is convenient to dismount and mount, the construction efficiency is high, and the application is suitable for high-altitude butt joint of various pipelines such as gas steel pipes.

Description

Technical Field

[0001] This application relates to the field of traction devices, and more specifically, to a coaxial pipe traction clamping device and a method for pipe connection therewith. Background Technology

[0002] Suspended connection construction of gas pipelines is widely used in engineering construction fields such as laying pipelines along bridges and building structures. The accuracy of pipeline connection directly affects welding quality, sealing performance, and long-term operational safety. Traditional gas steel pipeline connection usually involves hoisting the pipeline into place with a crane, and then relying entirely on manual observation and experience for pulling and adjustment. This method has the following significant technical drawbacks: Coaxiality control relies on experience and has low precision: the manual pulling method lacks rigid guidance and limit, and the alignment of the two pipe sections' axes depends heavily on the operator's skills. The coaxiality error is often greater than 0.5mm / m, which can only meet the requirements of general pipe installation with low precision.

[0003] Poor adaptability under high-altitude suspended conditions: Under high-altitude suspended conditions, the steel pipe itself has a large deflection and is affected by environmental factors such as wind force and swaying of the slings, resulting in an unstable dynamic state for the pipeline. Traditional manual pulling is difficult to stably control the pipe end posture and cannot meet the requirements for high-precision docking.

[0004] Lack of an effective axial traction and locking linkage mechanism: Existing technology lacks an integrated device that can quickly lock two pipe sections onto the same axis, provide stable and controllable axial jacking force, and is suitable for high-altitude operations. Problems such as pipe slippage, asynchronous jacking, and uneven joint gaps frequently occur during construction, directly affecting welding quality and construction efficiency.

[0005] The equipment is inconvenient to assemble and disassemble and is difficult to reuse: Traditional auxiliary tooling is mostly an integrated structure designed for specific pipe diameters. It is difficult to assemble and disassemble in narrow working areas at high altitudes and cannot adapt to rapid adjustments for different pipe diameters, resulting in poor versatility.

[0006] Therefore, there is an urgent need to provide a pipeline connection device and construction method that can achieve coaxial locking, smooth traction, and precise alignment of two gas steel pipes in a high-altitude suspended state, and that is simple in structure, easy to disassemble and assemble, and widely applicable, so as to overcome the shortcomings of the existing technology. Summary of the Invention

[0007] The purpose of this application is to provide a coaxial pipe traction clamping device and a method for pipe connection, which can solve the above-mentioned technical problems.

[0008] This application provides a coaxial pipe traction clamping device, including a left traction clamping device, a right traction clamping device, and a steel pipe slide rail. Both the left traction clamping device and the right traction clamping device can be slidably installed on the steel pipe slide rail. Both the left traction clamping device and the right traction clamping device include a pipe welding butt joint tool, a hydraulic jacking back steel ring, and a hydraulic jack. The pipe welding fitting includes two first annular limiting members and several fastening components. The two first annular limiting members are fixed by a first locking device. The several fastening components are evenly distributed on the first annular limiting members. At least one hydraulic jack is provided on the side of the first annular limiting member. The hydraulic jacking rear steel ring includes two second annular limiting members and a hydraulic jack placement member. The two second annular limiting members are fixed by a second locking device. The hydraulic jack placement member is installed on the second annular limiting members. The bottom end of the hydraulic jack is fixedly connected to the hydraulic jack placement member. The output end of the hydraulic jack is connected to the hydraulic jack top iron.

[0009] Preferably, the fastening assembly includes a fastening screw and a fastening nut, wherein the fastening screw passes through the first annular limiting member or the second annular limiting member, and the fastening nut is configured to cooperate with the fastening screw.

[0010] Preferably, a plurality of sliding rail fixing steel rings are evenly arranged outside the first annular limiting member or the second annular limiting member, and the steel pipe sliding rail passes through the sliding fixing steel rings.

[0011] Preferably, both the first locking device and the first locking device are clamp-type quick-release structures made of high carbon steel, used to realize the split connection and disassembly of the ring iron.

[0012] Preferably, both the first and second annular limiting members are cut from steel plates with a wall thickness of 8mm. The outer diameter of the first annular limiting member is at least 50mm larger than its inner diameter, and the outer diameter of the second annular limiting member is at least 50mm larger than its inner diameter.

[0013] Preferably, the hydraulic jack top plate and the hydraulic jack placement piece are both made of 10mm thick steel plate. The size of the hydraulic jack top plate is at least 20mm larger than the size of the hydraulic jack head, and the size of the jack placement piece is at least 20mm larger than the size of the bottom of the hydraulic jack.

[0014] Preferably, the fastening screw and the fastening nut are M22×2.5mm in size, and the length of the fastening screw is adapted to the diameter of the gas steel pipe to be connected.

[0015] Preferably, a fixing strip is provided between the first annular limiting member and the fixing screw, and between the second annular limiting member and the fixing screw. The fixing strip is made of 50mm thick steel strip and has holes that are adapted to the fixing screw.

[0016] Preferably, the steel pipe slide rail is made of Q235 steel, with an outer diameter of 20mm and a wall thickness of not less than 5mm; the slide rail fixing steel ring is made of Q235 steel, with a wall thickness of not less than 5mm, and the deviation between the inner diameter of the slide rail fixing steel ring and the outer diameter of the steel pipe slide rail is not greater than 0.1mm.

[0017] A pipe connection method using a coaxial pipe traction clamping device includes the following steps: S1. Equipment preparation: Based on the size of the gas steel pipe to be connected and the friction of the gas steel pipe, make a coaxial pipe traction clamping device, make the first annular limiting part of the pipe welding butt joint fitting and the second annular limiting part of the hydraulic jacking back steel ring, and select a hydraulic jack that meets the safety performance and calculation requirements. S2. Pipeline hoisting and positioning: Use a crane to hoist the two gas steel pipe sections to be connected to a distance of 40cm-50cm from the connection position, and adjust the axial position deviation of the two steel pipe sections to not exceed 20cm. S3. Installation of traction clamping device: Open the pipe welding fitting and the detachable locking device of the hydraulic jacking back steel ring in the left and right traction clamping devices respectively, put them into the gas steel pipe on the corresponding side and lock them in place; adjust the distance between the hydraulic jacking back steel ring and the pipe welding fitting so that it is within the stroke range of the hydraulic jack, and simultaneously align the position of the jack placement device and the jack top iron. S4. Steel pipe slide rail installation: Insert the steel pipe slide rail into the slide rail fixing steel ring of the left traction clamping device and the right traction clamping device in sequence. Then lock the steel pipe slide rail with the slide rail fixing steel ring of the hydraulic push-back steel ring of the left and right traction clamping devices. Check the locking status of all locking parts and the sliding status of the pipe welding butt joint. S5. Hydraulic jack installation and jacking: Install the hydraulic jack onto the jack placement device and check the stroke and working status of the hydraulic jack; start the hydraulic jack to jack, and after the gas steel pipe is moved to the designated docking position, check the fit of the two pipe joints and the elevation deviation. S6. Steel pipe welding operation: After the joint position and elevation of the two pipe sections meet the welding requirements, pipe welding shall be carried out; after the weld joint is inspected and qualified, the coaxial pipe traction clamping device shall be removed in sequence according to the principle of "install first and remove later".

[0018] The beneficial effects of this invention are: This invention uses mirror-image left and right traction clamping devices and steel pipe slide rails as rigid guides to keep the two pipe welding joints always on the same axis. The hydraulic jack pushes the pipe welding joint to slide smoothly along the slide rail, effectively avoiding the axis deviation caused by manual pulling. The coaxiality error can be controlled within 0.2mm / m, significantly improving the docking accuracy under high-altitude suspended conditions and meeting high-level welding quality requirements. This invention uses a hydraulic jack as a power source, along with a fastening screw, a fastening nut, and a detachable locking device, to achieve the linkage between radial locking and axial traction of the pipeline. After hydraulic jacking, the back steel ring locks to the steel pipe slide rail as a fixed support. After the pipeline welding and mating device grips the steel pipe, it moves along the slide rail. Even if there is oil or slight corrosion on the pipeline surface, slippage or deflection will not occur, ensuring a smooth and controllable jacking process. The detachable locking device adopts a clamp-type quick-release structure, allowing for rapid insertion or removal of the ring iron from the pipe without the need for complex tools; the steel pipe slide rail and the slide rail fixing steel ring are fitted with a clearance fit (deviation ≤0.1mm), ensuring smooth sliding while preventing wobbling. The entire device is lightweight and modular, allowing for rapid installation and dismantling in narrow working areas at heights, significantly reducing manual labor intensity; The diameter of the annular iron and the length of the fastening screw can be customized according to the diameter of the steel pipe to be connected; the hydraulic jack can be selected and adjusted according to the required jacking force. This device is not only suitable for gas steel pipes, but also for suspended connection construction of other metal pipes such as water pipes and steam pipes, and has wide applicability; The construction method of this invention simplifies the multiple adjustments required by traditional manual pulling into a single hydraulic jacking operation through a standardized process of "hoisting and positioning → device installation → slide rail fixing → hydraulic jacking → welding → disassembly," reducing the single-joint time by more than 50%. Simultaneously, due to the uniform gaps and high coaxiality of the joints, the first-pass yield rate of welding is significantly improved, avoiding rework caused by misalignment or uneven gaps. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the pipe welding butt joint device of the present invention; Figure 3 This is a side view of the pipe welding butt joint device of the present invention; Figure 4 This is a schematic diagram of the hydraulically jacked back steel ring of the present invention.

[0021] The reference numerals in the attached figures are as follows: 1. Left traction clamping device; 2. Right traction clamping device; 3. Steel pipe slide rail; 4. Pipe welding butt joint tool; 5. Hydraulic jacking back steel ring; 6. Hydraulic jack; 7. First annular limiting component; 8. Fastening assembly; 9. First locking device; 10. Hydraulic jack top iron; 11. Second annular limiting component; 12. Hydraulic jack placement component; 13. Second locking device; 14. Fastening screw; 15. Fastening nut; 16. Slide rail fixing steel ring; 17. Fixing strip. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0028] like Figure 1-4 As shown, a coaxial pipe traction clamping device includes a left traction clamping device 1, a right traction clamping device 2, and a steel pipe slide rail 3. The left traction clamping device 1 and the right traction clamping device 2 can be slidably installed on the steel pipe slide rail 3. The left traction clamping device 1 and the right traction clamping device 2 both include a pipe welding butt joint tool 4, a hydraulic jacking back steel ring 5, and a hydraulic jack 6. The pipe welding fitting 4 includes two first annular limiting parts 7 and several fastening components 8. The two first annular limiting parts 7 are fixed by a first locking device 9. The several fastening components 8 are evenly distributed on the first annular limiting parts 7. At least one hydraulic jack top iron 10 is provided on the side of the first annular limiting parts 7. The hydraulic jacking rear steel ring 5 includes two second annular limiting members 11 and a hydraulic jack placement member 12. The two second annular limiting members 11 are fixed by a second locking device 13. The hydraulic jack placement member 12 is installed on the second annular limiting members 11. The bottom end of the hydraulic jack 6 is fixedly connected to the hydraulic jack placement member 12. The output end of the hydraulic jack 6 is connected to the hydraulic jack top iron 10.

[0029] In use, open the detachable locking device, and insert the left and right pipe welding couplings 4 and the hydraulic jacking back steel rings 5 ​​onto the two sections of gas steel pipes to be connected; use the fastening components 8 to limit and fix the gas steel pipes, adjust the axial distance between the hydraulic jacking back steel rings 5 ​​and the pipe welding couplings 4, and align the jack placement device with the jack top position. Insert the multiple steel pipe slide rails 3 sequentially into the slide rail fixing steel rings 16 on the left and right sides, and lock the two ends of the steel pipe slide rails 3 to the slide rail fixing steel rings 16 on the left and right hydraulic jacking back steel rings 5, making the back steel rings... With the support point fixed, place the hydraulic jack 6 on the jack placement device, aligning the jack head with the jack top; start the hydraulic jack 6 to push out synchronously, pushing the pipe welding alignment tool 4 to slide along the steel pipe slide rail 3 towards the middle; the alignment tools of the left and right devices move relative to each other, gradually bringing the two steel pipe ends closer together until the required gap for welding is reached; check the position, elevation, and misalignment of the joint, and weld after meeting the requirements; after the welding inspection is qualified, remove the hydraulic jack 6, pull out the steel pipe slide rail 3, open the detachable locking device, and remove the pipe welding alignment tool 4 and the hydraulic jack back steel ring 5.

[0030] In this embodiment, the fastening assembly 8 includes a fastening screw 14 and a fastening nut 15. The fastening screw 14 passes through the first annular limiting member 7 or the second annular limiting member 11. The fastening nut 15 is configured to cooperate with the fastening screw 14. The present invention uses the fastening screw 14 and the fastening nut 15 to fasten and clamp the gas pipeline.

[0031] In this embodiment, a plurality of slide rail fixing steel rings 16 are uniformly arranged outside the first annular limiting member 7 or the second annular limiting member 11. The steel pipe slide rail 3 passes through the sliding fixing steel ring. The present invention adopts a segmented slide rail, which makes the left traction clamping device 1 and the right traction clamping device 2 run smoothly and distribute the gravity, thus ensuring the safety and reliability of operation.

[0032] In this embodiment, both the first locking device 9 and the second locking device 13 are clamp-type quick-release structures made of high carbon steel. They are used to realize the split connection and disassembly of the ring iron. The device can be put into or taken out of the pipe without completely removing the bolts. It is particularly suitable for high-altitude narrow working surfaces, which significantly shortens the installation and disassembly time and improves construction efficiency.

[0033] In this embodiment, both the first annular limiting member 7 and the second annular limiting member 11 are cut from steel plates with a wall thickness of 8mm. The outer diameter of the first annular limiting member 7 is at least 50mm larger than its inner diameter, and the outer diameter of the second annular limiting member 11 is at least 50mm larger than its inner diameter. Their main function is to work together with the sliding fixed steel ring, the jack top iron, the jack placement device, the steel pipe slide rail 3, the detachable locking device, the fastening screw 14 and the fastening nut 15 to lock and pull the gas steel pipe.

[0034] In this embodiment, both the hydraulic jack top plate 10 and the hydraulic jack placement piece 12 are made of 10mm thick steel plate. The size of the hydraulic jack top plate 10 is at least 20mm larger than the size of the hydraulic jack head 6, and the size of the jack placement piece is at least 20mm larger than the size of the bottom of the hydraulic jack 6. The present invention is made of 10mm thick steel plate, and the size is 20mm larger than the jack head or bottom. This ensures that the top plate and placement device do not buckle or deform when subjected to concentrated pressure, and provides sufficient positioning margin to facilitate quick centering of the jack and prevent uneven loading or slippage during the jacking process.

[0035] In this embodiment, the fastening screw 14 and the fastening nut 15 are M22×2.5mm in size. The length of the fastening screw 14 is adapted to the diameter of the gas steel pipe to be connected. The present invention uses an M22×2.5mm fastening screw 14 in conjunction with a fastening strip made of 50mm thick steel bar, which provides a strong radial locking force to ensure that the pipe welding fitting 4 will not slide relative to the pipe when subjected to axial jacking friction. The screw length can be adapted to different pipe diameters, enhancing the versatility of the device.

[0036] In this embodiment, fixing strips 17 are provided between the first annular limiting member 7 and the fixing screw, and between the second annular limiting member 11 and the fixing screw. The fixing strips are made of 50mm thick steel strips and have holes that fit the fixing screw 14. The 4-8 fixing strips of this invention are evenly distributed at equal angles along the circumference, so that the annular iron is subjected to uniform force when clamping the pipe, avoiding local stress concentration that may cause pipe deformation or device damage; at the same time, it ensures the connection strength between the two annular iron pieces and meets the requirements of repeated use.

[0037] In this embodiment, the steel pipe slide rail 3 is made of Q235 steel, with an outer diameter of 20mm and a wall thickness of not less than 5mm; the slide rail fixing steel ring 16 is also made of Q235 steel, with a wall thickness of not less than 5mm, and the deviation between the inner diameter of the slide rail fixing steel ring 16 and the outer diameter of the steel pipe slide rail 3 is not greater than 0.1mm. The Q235 steel slide rail, with an outer diameter of 20mm and a wall thickness ≥5mm, has sufficient bending stiffness and does not produce significant deflection under long-distance suspension conditions; the deviation between the inner diameter of the slide rail fixing steel ring 16 and the outer diameter of the slide rail is ≤0.1mm, ensuring smooth sliding and eliminating radial sway, thereby ensuring that the coaxial accuracy of the two pipe sections is controlled within 0.2mm / m when they are joined.

[0038] By setting up mirror-image left and right traction clamping devices 2 and using steel pipe slide rail 3 as a rigid guide, the two pipe welding joints 4 are always kept on the same axis; the hydraulic jack 6 pushes the pipe welding joint 4 to slide smoothly along the slide rail, effectively avoiding the axis deviation caused by manual pulling, and the coaxiality error can be controlled within 0.2mm / m, significantly improving the docking accuracy under high-altitude suspended working conditions and meeting the high-level welding quality requirements; This invention uses a hydraulic jack 6 as a power source, in conjunction with a fastening screw 14, a fastening nut 15, and a detachable locking device, to achieve the linkage of radial locking and axial traction of the pipeline. After hydraulic jacking, the back steel ring 5 locks to the steel pipe slide rail 3 as a fixed support. After the pipeline welding joint 4 clamps the steel pipe, it moves along the slide rail. Even if there is oil or slight corrosion on the pipeline surface, slippage or deflection will not occur, ensuring a smooth and controllable jacking process. The detachable locking device adopts a clamp-type quick-release structure, allowing the ring iron to be quickly fitted into or removed from the pipe without complicated tools; the steel pipe slide rail 3 and the slide rail fixing steel ring 16 adopt a clearance fit (deviation ≤0.1mm), which ensures smooth sliding and avoids shaking. The entire device is lightweight and modular, allowing for quick installation and dismantling in narrow working areas at heights, significantly reducing manual labor intensity; The diameter of the annular iron and the length of the fastening screw 14 can be customized according to the diameter of the steel pipe to be connected; the selection of the hydraulic jack 6 can be adjusted according to the required jacking force. This device is not only suitable for gas steel pipes, but also for the suspended connection construction of other metal pipes such as water pipes and steam pipes, and has a wide range of applications; The construction method of this invention simplifies the multiple adjustments required by traditional manual pulling into a single hydraulic jacking operation through a standardized process of "hoisting and positioning → device installation → slide rail fixing → hydraulic jacking → welding → disassembly," reducing the single-joint time by more than 50%. Simultaneously, due to the uniform gaps and high coaxiality of the joints, the first-pass yield rate of welding is significantly improved, avoiding rework caused by misalignment or uneven gaps. Example

[0039] like Figure 1-4 As shown, a pipe connection method using a coaxial pipe traction clamping device includes the following steps: S1. Equipment preparation: Based on the size of the gas steel pipe to be connected and the friction of the gas steel pipe, make a coaxial pipe traction clamping device, make the first annular limiting part 7 of the pipe welding butt 4 and the second annular limiting part 11 of the hydraulic jacking back steel ring 5, and select a hydraulic jack 6 that meets the safety performance and calculation requirements. S2. Pipeline hoisting and positioning: Use a crane to hoist the two gas steel pipe sections to be connected to a distance of 40cm-50cm from the connection position, and adjust the axial position deviation of the two steel pipe sections to not exceed 20cm. S3. Installation of traction clamping device: Open the pipe welding alignment device 4 and the detachable locking device of the hydraulic jacking back steel ring 5 in the left traction clamping device 1 and the right traction clamping device 2 respectively, put them into the corresponding side of the gas steel pipe and lock them in place; adjust the distance between the hydraulic jacking back steel ring 5 and the pipe welding alignment device 4 so that it is within the stroke range of the hydraulic jack 6, and simultaneously align the position of the jack placement device and the jack top iron. S4. Installation of steel pipe slide rail 3: Insert the steel pipe slide rail 3 into the slide rail fixing steel ring 16 of the left traction clamping device 1 and the right traction clamping device 2 in sequence. Then lock the steel pipe slide rail 3 and the slide rail fixing steel ring 16 of the back steel ring 5 after the hydraulic push of the left and right traction clamping devices 2. Check the locking status of all locking parts and the sliding status of the pipe welding joint 4. S5. Installation and jacking of hydraulic jack 6: Install hydraulic jack 6 onto the jack placement device and check the stroke and working status of hydraulic jack 6; start hydraulic jack 6 to jack, and after the gas steel pipe is moved to the designated docking position, check the fit of the two pipe joints and the elevation deviation. S6. Steel pipe welding operation: After the joint position and elevation of the two pipe sections meet the welding requirements, pipe welding shall be carried out; after the weld joint is inspected and qualified, the coaxial pipe traction clamping device shall be removed in sequence according to the principle of "install first and remove later".

[0040] In step S1, the dimensions of the jack placement device and the jack top iron need to be made according to the dimensions of the hydraulic jack 6 on site. The hydraulic device needs to be firmly fixed to the placement position with welded steel plates to prevent slippage.

[0041] In step S2, if the difference in the hoisting positions of the two pipe sections is too large, they need to be re-hoisted and adjusted; direct installation of the device is prohibited.

[0042] In step S5, if the pipeline slips or becomes stuck during the jacking process of the hydraulic device, it should be stopped immediately, and all locking devices and the hydraulic system should be re-inspected.

[0043] In step S6, before disassembling the device, the welding quality must be inspected and qualified. Disassembly is prohibited if the quality is not qualified. The disassembly process must follow the principle of "install first, then disassemble" and "install last, then disassemble first". Disassembly is strictly prohibited.

[0044] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A coaxial pipe traction clamping device, characterized in that: It includes a left traction clamping device, a right traction clamping device, and a steel pipe slide rail, wherein both the left traction clamping device and the right traction clamping device can be slidably installed on the steel pipe slide rail; Both the left traction clamping device and the right traction clamping device include a pipe welding butt joint tool, a hydraulic jacking back steel ring, and a hydraulic jack. The pipe welding fitting includes two first annular limiting members and several fastening components. The two first annular limiting members are fixed by a first locking device. The several fastening components are evenly distributed on the first annular limiting members. At least one hydraulic jack is provided on the side of the first annular limiting member. The hydraulic jacking rear steel ring includes two second annular limiting members and a hydraulic jack placement member. The two second annular limiting members are fixed by a second locking device. The hydraulic jack placement member is installed on the second annular limiting members. The bottom end of the hydraulic jack is fixedly connected to the hydraulic jack placement member. The output end of the hydraulic jack is connected to the hydraulic jack top iron.

2. The coaxial pipe traction clamping device according to claim 1, characterized in that: The fastening assembly includes a fastening screw and a fastening nut. The fastening screw passes through the first annular limiting member or the second annular limiting member, and the fastening nut is configured to cooperate with the fastening screw.

3. The coaxial pipe traction clamping device according to claim 1, characterized in that: A plurality of sliding rail fixing steel rings are evenly arranged outside the first annular limiting member or the second annular limiting member, and the steel pipe sliding rail passes through the sliding fixing steel rings.

4. The coaxial pipe traction clamping device according to claim 1, characterized in that: Both the first locking device and the first locking device are clamp-type quick-release structures made of high carbon steel, used to realize the split connection and disassembly of the ring iron.

5. A coaxial pipe traction clamping device according to claim 1, characterized in that: Both the first and second annular limiting members are cut from steel plates with a wall thickness of 8mm. The outer diameter of the first annular limiting member is at least 50mm larger than its inner diameter, and the outer diameter of the second annular limiting member is at least 50mm larger than its inner diameter.

6. The coaxial pipe traction clamping device according to claim 1, characterized in that: Both the hydraulic jack top plate and the hydraulic jack placement piece are made of 10mm thick steel plate. The size of the hydraulic jack top plate is at least 20mm larger than the size of the hydraulic jack head, and the size of the jack placement piece is at least 20mm larger than the size of the bottom of the hydraulic jack.

7. A coaxial pipe traction clamping device according to claim 1, characterized in that: The fastening screw and the fastening nut are M22×2.5mm in size, and the length of the fastening screw is adapted to the diameter of the gas steel pipe to be connected.

8. The coaxial pipe traction clamping device according to claim 1, characterized in that: A fixing strip is provided between the first annular limiting member and the fixing screw, and between the second annular limiting member and the fixing screw. The fixing strip is made of 50mm thick steel strip and has holes that are adapted to the fixing screw.

9. A coaxial pipe traction clamping device according to claim 3, characterized in that: The steel pipe slide rail is made of Q235 steel, with an outer diameter of 20mm and a wall thickness of not less than 5mm; the slide rail fixing steel ring is made of Q235 steel, with a wall thickness of not less than 5mm, and the deviation between the inner diameter of the slide rail fixing steel ring and the outer diameter of the steel pipe slide rail is not greater than 0.1mm.

10. A pipe docking method using the coaxial pipe traction clamping device according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Equipment preparation: Based on the size of the gas steel pipe to be connected and the friction of the gas steel pipe, make a coaxial pipe traction clamping device, make the first annular limiting part of the pipe welding butt joint fitting and the second annular limiting part of the hydraulic jacking back steel ring, and select a hydraulic jack that meets the safety performance and calculation requirements. S2. Pipeline hoisting and positioning: Use a crane to hoist the two gas steel pipe sections to be connected to a distance of 40cm-50cm from the connection position, and adjust the axial position deviation of the two steel pipe sections to not exceed 20cm. S3. Installation of traction clamping device: Open the pipe welding fitting and the detachable locking device of the hydraulic jacking back steel ring in the left and right traction clamping devices respectively, put them into the gas steel pipe on the corresponding side and lock them in place; adjust the distance between the hydraulic jacking back steel ring and the pipe welding fitting so that it is within the stroke range of the hydraulic jack, and simultaneously align the position of the jack placement device and the jack top iron. S4. Steel pipe slide rail installation: Insert the steel pipe slide rail into the slide rail fixing steel ring of the left traction clamping device and the right traction clamping device in sequence. Then lock the steel pipe slide rail with the slide rail fixing steel ring of the hydraulic push-back steel ring of the left and right traction clamping devices. Check the locking status of all locking parts and the sliding status of the pipe welding butt joint. S5. Hydraulic jack installation and jacking: Install the hydraulic jack onto the jack placement device and check the stroke and working status of the hydraulic jack; start the hydraulic jack to jack, and after the gas steel pipe is moved to the designated docking position, check the fit of the two pipe joints and the elevation deviation. S6. Steel pipe welding operation: After the joint position and elevation of the two pipe sections meet the welding requirements, pipe welding shall be carried out; after the weld joint is inspected and qualified, the coaxial pipe traction clamping device shall be removed in sequence according to the principle of "install first and remove later, install last and remove first".

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