Large-diameter long-distance conveying pipeline welding multi-functional butt welding jig frame

Abstract

The application discloses a large-diameter long-distance conveying pipeline welding multifunctional butt welding jig frame, and belongs to the technical field of building construction, which comprises a jig frame supporting system, a butt system and a winter and rainy season construction temporary sealing system, the jig frame supporting system is mainly composed of H-shaped main supporting frames, the butt system is mainly composed of fine adjustment butt components and coarse adjustment positioning components, and the winter and rainy season construction temporary sealing system is mainly composed of upper horizontal rods, top horizontal connecting rods, slope connecting rods, riveted ground short pipes and sealing sheds. The application has the butt welding function of large-diameter long-distance pipeline welding, and can further provide a temporary sealing local working environment for winter and rainy season construction according to the weather condition of a construction site. The application does not need to dig many large working pits, is convenient for pipeline foundation treatment, has small work load, and can provide a reasonable space for the application of a track adsorption type welding robot, thereby providing a technical support for the application of the welding robot, and effectively improving engineering quality and work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to the welding construction of conveying pipelines, specifically a multi-functional butt welding jig for welding large-diameter long-distance conveying pipelines. Background Technology

[0002] Large-diameter pipelines play a crucial role in modern industrial production and public works projects, frequently appearing in key national and regional infrastructure construction projects. Large-diameter pipelines are characterized by their large diameter and long length, and in practical applications, welding is often used for pipeline connection and construction.

[0003] Currently, the welding connection of large-diameter pipelines all adopts the traditional construction method of manual alignment. This method is difficult to operate in practice and is time-consuming and labor-intensive. If the pre-made alignment tools on the market are used, due to the large diameter of the pipeline, large-diameter alignment tools must be specially made. Since both the pipeline and the large-diameter alignment tool are relatively heavy, the installation and alignment of the large-diameter alignment tool is almost impossible. At the same time, many large working pits need to be excavated, which brings many inconveniences and considerable investment to the earthwork and pipe foundation treatment. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to provide a multifunctional butt welding jig for welding large-diameter long-distance conveying pipelines.

[0005] This invention is achieved through the following technical solution: A multi-functional butt welding jig for welding large-diameter, long-distance pipelines includes a jig support system, a butt welding system, and a temporary closure system for construction during winter and rainy seasons.

[0006] The support system includes an H-shaped main support frame, which consists of a left column, a right column, and a central main support beam fixedly connected between them. Multiple sets of H-shaped main support frames are arranged sequentially, and the left and right columns of the multiple sets of H-shaped main support frames are all fixedly connected by two upper and lower stabilizing rods. The central main support beam includes two H-shaped beam frames, which are arranged laterally and respectively abut against the front and rear sides of the left and right columns. An adjustment joint is left between the two H-shaped beam frames.

[0007] The alignment system includes a fine-tuning alignment component and a coarse-tuning positioning component. The fine-tuning alignment component includes two sets of fine-tuning members, one on the left and one on the right. Each fine-tuning member includes an outer equilateral angle steel block and an inner equilateral angle steel block supported on the top of the two H-shaped beams. A fine-tuning threaded round steel bar is movably connected through the outer equilateral angle steel block. The inner end of the fine-tuning threaded round steel bar is fixedly connected to the inner equilateral angle steel block. A positioning nut is threaded onto the fine-tuning threaded round steel bar. The positioning nut is located inside the outer equilateral angle steel block and abuts against it. The inner equilateral angle steel block... A slanted hardwood block is fixedly connected to the side of the angle steel block away from the outer equilateral angle steel block; the coarse adjustment positioning assembly includes two coarse adjustment steel plates, which are fixed to the bottom of the two outer equilateral angle steel blocks respectively. The two coarse adjustment steel plates pass downward through the adjustment joint between the two H-shaped beams. A coarse adjustment threaded round steel is movably connected between the two coarse adjustment steel plates. Two positioning nuts are threaded on the coarse adjustment threaded round steel. The two positioning nuts are located on the outside of the two coarse adjustment steel plates and abut against their respective coarse adjustment steel plates.

[0008] The temporary enclosure system for winter and rainy season construction includes upper horizontal bars, top horizontal connecting bars, slope connecting bars, ground-mounted short pipes, and an enclosure. The upper horizontal bars are set on the left and right sides of the frame support system. The two ends of the left upper horizontal bar are connected to the top of the left column of the two adjacent H-shaped main support frame bodies through T-joints, and the two ends of the right upper horizontal bar are connected to the top of the right column of the two adjacent H-shaped main support frame bodies through T-joints. The top horizontal connecting bars are fixedly connected between the left and right upper horizontal bars. The slope connecting bars are set on the left and right sides of the frame support system, and the left and right slope connecting bars are rotatably connected to the left and right upper horizontal bars respectively. The bottom end of the slope connecting bars is hinged to the ground-mounted short pipes. The enclosure is installed on the frame support system, the middle top horizontal connecting bar, the left and right upper horizontal bars, and the left and right slope connecting bars.

[0009] Furthermore, in the H-shaped main support frame, the left and right columns have the same structure, including a U-shaped base column and main side tubes; the U-shaped base column includes two symmetrically arranged first vertical tubes, and a second vertical tube extending upwards is welded and fixed between the two first vertical tubes; the ends of two H-shaped beams are sandwiched on the front and rear sides of the second vertical tube, the bottom of the two H-shaped beams abuts against the top of the two first vertical tubes, and the ends of the two H-shaped beams are connected and fixed to the second vertical tube by multiple through bolts; the main side tube is sleeved and installed on the top of the second vertical tube; the ends of the upper and lower stabilizing rods are both connected and fixed to the second vertical tube in the U-shaped base column by through bolts.

[0010] Furthermore, the top and bottom of the two first vertical pipes in the convex-shaped base column are both beveled, and the bottom of the two H-shaped beams are also beveled. The beveled surface at the top of the first vertical pipe matches and fits snugly with the beveled surface at the bottom of the H-shaped beam.

[0011] Furthermore, the matching system also includes a top truss, which is installed between the inner ends of the upper part of the left and right main side tubes of the H-shaped main support frame. The top truss and the main side tubes are connected and fixed by through bolts. Hand hoists are installed at both ends of the top truss by steel wire strong ring hooks, and steel wire ropes / lifting straps are connected to the hand hoists.

[0012] Furthermore, the top truss includes supporting vertical beams on the left and right sides, and two supporting horizontal beams are fixed between the supporting vertical beams on the left and right sides; the supporting vertical beams are connected and fixed to the main side pipe by through bolts, and a hand hoist is installed on the upper and lower supporting horizontal beams.

[0013] Furthermore, two stabilizing rods are fixedly connected between the upper parts of the main side tubes of adjacent H-shaped main support frames. The two stabilizing rods are located at the position where the outer end of the main side tube connects to the supporting vertical beam. The supporting vertical beam, the main side tube and the stabilizing rods are connected and fixed by through bolts.

[0014] Furthermore, the ramp connecting rod, the upper crossbar, and the top crossbar are connected by a hinge tee, allowing the ramp connecting rod to rotate freely relative to the upper crossbar via the hinge tee.

[0015] Furthermore, the slope connecting rods are connected by through-threaded couplings.

[0016] The multifunctional butt welding jig for large-diameter, long-distance pipeline welding described in this invention is a modular assembly jig system. It features butt welding capabilities for large-diameter, long-distance pipelines and can also provide a temporarily enclosed local working environment for winter and rainy season construction, adaptable to local weather conditions. When using this multifunctional butt welding jig for butt welding operations, it eliminates the need for extensive excavation of large working pits, simplifies pipe foundation treatment, reduces workload, and provides a suitable space for the application of rail-mounted adsorption welding robots, offering technical support for the application of welding robots and effectively improving project quality and work efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0018] Figure 1 This is a front view of the frame of the present invention (the top truss structure is not shown).

[0019] Figure 2 for Figure 1 Left view (top truss structure not shown).

[0020] Figure 3 for Figure 2 Enlarged schematic diagram of a partial structure of the left-center column.

[0021] Figure 4 for Figure 1 A magnified schematic diagram of the interface architecture.

[0022] Figure 5 for Figure 4 Top view.

[0023] Figure 6 This is a schematic diagram of other additional structures in the mating system of the present invention.

[0024] Figure 7 This is a schematic diagram showing the connection of adjacent slope connecting rods in the frame of the present invention through through-wire clamps.

[0025] In the diagram: 1-Left column, 2-Right column, 3-Central main bearing beam, 4-Stabilizing connecting rod, 5-Top horizontal connecting rod, 7-H-shaped beam frame, 8-Outer equilateral angle steel block, 9-Inner equilateral angle steel block, 10-Fine adjustment threaded round steel, 12-Slanted hardwood block, 13-Coarse adjustment steel plate, 14-Coarse adjustment threaded round steel, 15-Upper horizontal bar, 16-Slope connecting rod, 17-Riveted short pipe, 18-Working pipe, 19-First vertical pipe, 20-Second vertical pipe, 21-Threaded pipe clamp, 22-Main side pipe, 23-Supporting vertical beam, 24-Supporting horizontal beam, 25-Hand-operated hoist, 26-Wire rope / lifting strap, 27-Adjusting joint, 28-Hinge tee. Detailed Implementation

[0026] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore merely examples and should not be used to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0027] like Figures 1 to 7 As shown, this embodiment provides a multi-functional butt welding jig for welding large-diameter long-distance pipelines, including a jig support system, a butt welding system, and a temporary closure system for winter and rainy season construction.

[0028] The support system includes an H-shaped main support frame, which consists of a left column 1, a right column 2, and a central main support beam 3 fixedly connected between them. The total height of the H-shaped main support frame is 1450mm, and it is driven into the pipe foundation for 500m during use. Multiple sets of H-shaped main support frames are arranged in sequence. The left columns 1 and right columns 2 of the multiple sets of H-shaped main support frames are all fixedly connected by two upper and lower stabilizing rods 4. The central main support beam 3 includes two H-shaped beam frames 7, which are arranged laterally and respectively abut against the front and rear sides of the left and right columns 1 and 2. An adjustment joint 27 is formed between the two H-shaped beam frames 7.

[0029] Specifically, in the H-shaped main support frame, the left column 1 and right column 2 have the same structure, including a U-shaped base column and a main side tube 22; the U-shaped base column includes two symmetrically arranged first vertical tubes 19, and a second vertical tube 20 extending upwards is welded and fixed between the two first vertical tubes 19; the ends of two H-shaped beam frames 7 are sandwiched on the front and rear sides of the second vertical tube 20, the bottom of the two H-shaped beam frames 7 abuts against the top of the two first vertical tubes 19, and the ends of the two H-shaped beam frames 7 are connected and fixed to the second vertical tube 20 by multiple through bolts. Both the first vertical tube 19 and the second vertical tube 20 are made of DN40 steel pipe with an outer diameter of 48 mm and an inner diameter of 41 mm. The through bolts are M10 mm with... The top and bottom ends of the two first vertical pipes 19 in the U-shaped base column are both 45° beveled, and the bottom ends of the two H-shaped beam frames 7 are also 45° beveled. The 45° beveled at the top of the first vertical pipe 19 matches and fits snugly with the 45° beveled at the bottom of the H-shaped beam frame 7. The matching 45° beveled at the top of the first vertical pipe 19 and the bottom of the H-shaped beam frame 7 is to facilitate the disassembly of the central main bearing beam 3 after construction. After removing the multi-through bolts, the H-shaped beam frame 7 will fall freely under the action of the 45° beveled and its own weight, completing the quick disassembly. The 45° beveled at the bottom of the first vertical pipe 19 is for easy insertion into the pipe base. The main side pipe 22 is directly sleeved on the top of the second vertical pipe 20 through the middle short pipe fixed on it. The ends of the upper and lower stabilizing connecting rods 4 are connected and fixed to the second vertical pipe 20 in the U-shaped base column by through bolts.

[0030] The alignment system includes fine-tuning alignment components, coarse-tuning positioning components, and a top truss. The fine-tuning alignment components include two sets of fine-tuning members, one on the left and one on the right. Each fine-tuning member consists of an outer equilateral angle steel block 8 and an inner equilateral angle steel block 9 supported on the top of the two H-shaped beams 7. The outer equilateral angle steel block 8 and the inner equilateral angle steel block 9 are made of ∟100*16*144 equilateral angle steel blocks. A Φ16 fine-tuning threaded round steel bar 10 is movably connected through the outer equilateral angle steel block 8. The inner end of the fine-tuning threaded round steel bar 10 is fixedly connected to the inner equilateral angle steel block 9. A positioning nut is threaded onto the fine-tuning threaded round steel bar 10. The positioning nut is located inside the outer equilateral angle steel block 8 and is connected to the outer equilateral angle steel block 9. Block 8 abuts, and a slanted hardwood block 12 is fixedly connected to the inner equilateral angle steel block 9 on the side away from the outer equilateral angle steel block 8; the coarse adjustment positioning assembly includes two 95*45*16 coarse adjustment steel plates 13 with Φ14 on the left and right, the two coarse adjustment steel plates 13 are fixed to the bottom of the two outer equilateral angle steel blocks 8 respectively, the two coarse adjustment steel plates 13 pass downward through the adjustment joint 27 between the two H-shaped beam frames 7, and a Φ12 coarse adjustment threaded round steel 14 is movably connected between the two coarse adjustment steel plates 13. Two positioning nuts are threaded on the coarse adjustment threaded round steel 14, and the two positioning nuts are located on the outside of the two coarse adjustment steel plates 13 respectively and abut against their respective coarse adjustment steel plates 13. The top truss is installed between the inner ends of the upper part of the left and right main side tubes 22 of the H-shaped main support frame. The top truss and the main side tubes 22 are connected and fixed by through bolts. Hand-operated hoists 25 are installed at both ends of the top truss via steel wire hooks, and steel wire ropes / lifting straps 26 are connected to the hand-operated hoists 25. The top truss includes supporting vertical beams 23 on both sides, and two supporting horizontal beams 24 are fixed between the supporting vertical beams 23 on both sides. The supporting vertical beams 23 are connected and fixed to the main side tubes 22 by through bolts, and the hand-operated hoists 25 are installed on the upper and lower supporting horizontal beams 24. Two stabilizing rods 4 are fixedly connected between the upper parts of the main side tubes 22 of adjacent H-shaped main support frames. The two stabilizing rods 4 are located at the position where the outer end of the main side tube 22 connects to the supporting vertical beam 23. The supporting vertical beams 23, the main side tubes 22, and the stabilizing rods 4 are connected and fixed by through bolts.

[0031] The temporary enclosure system for winter and rainy season construction includes an upper horizontal bar 15, a top horizontal connecting bar 5, a slope connecting bar 16, a short pipe 17, and an enclosed shed. The upper horizontal bar 15 is made of seamless steel pipe with an outer diameter of 38mm. The upper horizontal bar 15 is set on the left and right sides of the frame support system. Both ends of the left upper horizontal bar 15 are connected to the top of the left column 1 of the two adjacent H-shaped main support frames through a T-junction assembly. Both ends of the right upper horizontal bar 15 are connected to the top of the right column 2 of the two adjacent H-shaped main support frames through a T-junction assembly. The top horizontal connecting bar 5 is fixedly connected between the left and right upper horizontal bars 15. The slope connecting bar 16 is set on the left and right sides of the frame support system. 16 is rotatably connected to the left and right upper crossbars 15 respectively; the slope connecting rod 16, the upper crossbar 15 and the top crossbar 5 are connected by a hinge tee, and the slope connecting rod 16 can rotate arbitrarily relative to the upper crossbar 15 through the hinge tee; the slope connecting rod 16 is customized in three modules of 3m, 2m and 1m to adapt to different rod length requirements, and the end of the slope connecting rod 16 is provided with a connecting thread, and adjacent slope connecting rods 16 can be butt-connected by a threaded pipe clamp 21; the bottom end of the slope connecting rod 16 is hinged to the riveted short pipe 17; the enclosed canopy is installed on the entire frame support system, the middle top crossbar 5, the left and right upper crossbars 15 and the left and right slope connecting rods 16.

[0032] The multi-functional butt welding jig for welding large-diameter, long-distance pipelines described in this embodiment is used as follows: S1. Construction surveying and setting out At the construction site, surveyors drive nails into the center of the pipeline and fix centerline stakes and elevation stakes with cement blocks. Using a level and theodolite, control stakes (or temporary control stakes) are erected on roads, buildings, or utility poles on both sides of the centerline stake, and the distance and elevation are marked. Then, using the level and theodolite, additional centerline stakes are driven in and elevations are erected. The excavation width is calculated based on the elevation of each stake, and the area is divided in half on both sides of the center stake. A straight line is stretched between the two center stakes, lime is sprinkled, and excavation begins after verification.

[0033] During the earthwork excavation process, surveyors constantly measure the elevation of the trench bottom. Especially when using machinery for excavation, manual bottom checks are conducted when the trench bottom elevation is reached to a certain distance from the designed pipe bottom elevation to control the trench bottom elevation.

[0034] S2. Secondary measurement and layout for pipe foundation treatment After the pipe foundation is treated, the control piles are used to lay out the lines on the treated pipe foundation for the second time. The position of the H-shaped main support frame in the support system is determined through the center line of the working pipe 18. The H-shaped main support frame is driven in according to the control points. If the pipe foundation is made of concrete, holes are first drilled at the legs of the H-shaped main support frame, and the H-shaped main support frame is driven in according to the control points.

[0035] When determining the elevation of the central main bearing beam 3 in the H-type main bearing frame, a pre-prepared wooden template (with an outer diameter equal to that of the working pipe 18) is used to simulate the working pipe 18. The fine-tuning and coarse-tuning positioning components in the matching system are adjusted to the center position through the simulated working pipe 18. At the same time, the position and elevation of the central main bearing beam 3 in the first set of H-type main bearing frames are determined. The elevation of the central main bearing beam 3 in each subsequent continuous H-type main bearing frame is controlled and fixed with the first set as the standard.

[0036] There are multiple H-type main support frames, and the spacing is set according to the pattern of 4m, 2m, 4m, 2m... The length of the working pipe 18 is 6m, so the above-mentioned 4m interval is the pipe body part, and the 2m interval is the joint of the two working pipes 18.

[0037] After each H-type main support frame is installed, upper and lower stabilizing connecting rods 4 are installed between them to form a frame support system.

[0038] S3. Placement of the mating system and installation of the working pipe 18 Place the fine-tuning alignment component and the coarse-tuning positioning component, which make up the alignment system, on the central main bearing beam 3. Use a pre-prepared wooden template (the outer diameter of the wooden template is equal to the outer diameter of the working pipe 18) to simulate the working pipe 18. Adjust the fine-tuning alignment component and the coarse-tuning positioning component to the center position by simulating the working pipe 18.

[0039] When installing the fine-tuning alignment components and coarse-tuning positioning components, there is no distinction between initial and fine-tuning; the key is to ensure the maximum adjustment stroke. Place the fine-tuning alignment components and coarse-tuning positioning components on the main support frame, and control the elevation and position. At this time, hoist the first working pipe 18 up, and place an infrared controller inside the first working pipe 18 to control the placement of the fine-tuning alignment components and coarse-tuning positioning components under the second...nth pipe sections. The center line of each set of fine-tuning alignment components and coarse-tuning positioning components is controlled by the infrared controller, and a check and verification with the control pile is performed every three to five sections.

[0040] During the hoisting of the second section working pipe 18, jacks are installed under the working pipe 18, and alignment is achieved through the fine-tuning alignment component and the coarse-tuning positioning component.

[0041] When the deviation exceeds the process requirements, adjustments are made using the top truss and its hand-operated hoists 25 and wire ropes / lifting slings 26 (lifting slings are used when the working pipe 18 has an insulation or anti-corrosion layer). The working pipe 18 is aligned using two pairs of four hand-operated hoists 25. After the working pipe 18 is lifted, it is adjusted left and right using the fine-tuning alignment components. The gap between the aligned working pipes 18 is adjusted by reasonably adjusting the position of the wire ropes / lifting slings 26 (lifting slings are used when the working pipe 18 has an insulation or anti-corrosion layer). After the gap between the aligned working pipes is adjusted, the weld joint is fixed by spot welding.

[0042] It should be noted that the working pipe 18 joint position, that is, the weld position, is placed 500mm away from one side of the H-shaped main support body and 1500mm away from the other side of the H-shaped main support body, to facilitate the installation of the welding robot.

[0043] When installing the welding robot, according to the equipment parameters, first install the adsorption track belt, then install the welding robot, and finally carry out the robot welding operation.

[0044] After the working pipe 18 is welded, the weld is inspected according to the design and specification requirements. After the weld is qualified, the working pipe 18 is lowered onto the pipe base along the long line by the elasticity of the working pipe 18. Finally, the jig support system is gradually dismantled and reused.

[0045] In addition, when it is necessary to install a temporary enclosure system for winter and rainy season construction, the installation should be carried out in the following order: upper horizontal bar 15, top horizontal connecting bar 5, slope connecting bar 16, and ground-mounted short pipe 17.

[0046] The slope connecting rod 16 is connected to the upper horizontal rod 15 and the top horizontal connecting rod 5 via a hinge tee, and can rotate at any angle to form a sloping water surface with the ground at the edge of the trench. The slope connecting rod 16 is connected to the ground-mounted short pipe 17 via through bolts, and the ground-mounted short pipe 17 is riveted to the ground at the edge of the trench.

[0047] The enclosed canopy (rain shelter) is erected on the frame support system, the top horizontal connecting rod 5, the upper horizontal rod 15 and the slope connecting rod 16 as a whole. Ties are installed on the enclosed canopy at the rod parts to fix the enclosed canopy to the corresponding rods.

[0048] When needed during the rainy season, the temporary closure system for winter and rainy season construction can ensure organized drainage at the construction site and guarantee the smooth progress of construction during the rainy season.

[0049] When needed in winter, the temporary enclosure system for winter and rainy season construction can ensure that the construction site is relatively enclosed, and that welding and hydrostatic testing can be carried out smoothly in winter. For large-diameter buried pipelines, hydrostatic testing can generally be carried out in the shed without any additional measures.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A multi-functional butt welding jig for welding large-diameter, long-distance conveying pipelines, characterized in that: This includes the formwork support system, the alignment system, and the temporary enclosure system for construction during winter and rainy seasons; The support system of the frame includes an H-shaped main support frame, which consists of a left column (1), a right column (2) and a central main support beam (3) fixedly connected between the two; multiple sets of H-shaped main support frames are arranged in sequence, and two upper and lower stabilizing rods (4) are fixedly connected between the left columns (1) and the right columns (2) of the multiple sets of H-shaped main support frames; the central main support beam (3) includes two H-shaped beam frames (7), which are arranged laterally and respectively abut against the front and rear sides of the left and right columns (1, 2), and an adjustment joint (27) is left between the two H-shaped beam frames (7). In the H-shaped main support frame, the left column (1) and the right column (2) have the same structure, including a U-shaped bottom column and a main side tube (22); the U-shaped bottom column includes two symmetrically arranged first vertical tubes (19), and a second vertical tube (20) extending upward is welded and fixed between the two first vertical tubes (19); the ends of the two H-shaped beam frames (7) are sandwiched between the front and rear sides of the second vertical tube (20), the bottom of the two H-shaped beam frames (7) abuts against the top of the two first vertical tubes (19), and the ends of the two H-shaped beam frames (7) are... The second risers (20) are connected and fixed by multiple through bolts; the main side pipe (22) is sleeved and installed on the top of the second riser (20); the ends of the upper and lower stabilizing rods (4) are connected and fixed to the second riser (20) in the convex-shaped bottom column by through bolts; the top and bottom ends of the two first risers (19) in the convex-shaped bottom column are both beveled, and the bottom ends of the two H-shaped beams (7) are also beveled. The beveled top end of the first riser (19) matches and fits the beveled bottom end of the H-shaped beam (7). The alignment system includes a fine-tuning alignment component and a coarse-tuning positioning component. The fine-tuning alignment component includes two sets of fine-tuning components, one on the left and one on the right. Each fine-tuning component includes an outer equilateral angle steel block (8) and an inner equilateral angle steel block (9) supported on the top of the two H-shaped beams (7). A fine-tuning threaded round steel bar (10) is movably connected through the outer equilateral angle steel block (8). The inner end of the fine-tuning threaded round steel bar (10) is fixedly connected to the inner equilateral angle steel block (9). A positioning nut is threaded onto the fine-tuning threaded round steel bar (10). The positioning nut is located inside the outer equilateral angle steel block (8) and abuts against the outer equilateral angle steel block (8). The inner equilateral angle steel block (9) is far from the outer equilateral angle steel block (9). A slanted hardwood block (12) is fixedly connected to one side of the outer equilateral angle steel block (8); the coarse adjustment positioning assembly includes two coarse adjustment steel plates (13) on the left and right, the two coarse adjustment steel plates (13) are fixed to the bottom of the two outer equilateral angle steel blocks (8) respectively, the two coarse adjustment steel plates (13) pass through the adjustment joint (27) between the two H-shaped beams (7) downwards, and a coarse adjustment threaded round steel (14) is movably connected between the two coarse adjustment steel plates (13). Two positioning nuts are threaded on the coarse adjustment threaded round steel (14), and the two positioning nuts are located on the outside of the two coarse adjustment steel plates (13) respectively and abut against their respective coarse adjustment steel plates (13); The temporary enclosure system for winter and rainy season construction includes an upper horizontal bar (15), a top horizontal connecting bar (5), a slope connecting bar (16), a short pipe for ground anchoring (17), and an enclosed shed. The upper horizontal bar (15) is set on the left and right sides of the frame support system. Both ends of the upper horizontal bar (15) on the left are connected to the top of the left column (1) of the two adjacent H-type main support frame bodies through a three-way assembly. Both ends of the upper horizontal bar (15) on the right are connected to the top of the right column (2) of the two adjacent H-type main support frame bodies through a three-way assembly. Connection; the top horizontal connecting rod (5) is fixedly connected between the left and right upper horizontal rods (15); the slope connecting rod (16) is set on the left and right sides of the frame support system, and the left and right slope connecting rods (16) are rotatably connected to the left and right upper horizontal rods (15) respectively; the bottom end of the slope connecting rod (16) is hinged to the riveted short pipe (17); the enclosed canopy is installed on the frame support system, the middle top horizontal connecting rod (5), the left and right upper horizontal rods (15) and the left and right slope connecting rods (16) as a whole.

2. The multi-functional butt welding jig for large-diameter long-distance conveying pipelines according to claim 1, characterized in that: The matching system also includes a top truss, which is installed between the inner ends of the left and right main side pipes (22) of the H-shaped main support frame. The top truss and the main side pipes (22) are connected and fixed by through bolts. Hand hoists (25) are installed at both ends of the top truss by steel wire strong ring hooks. Steel wire ropes / lifting belts (26) are connected to the hand hoists (25).

3. The multi-functional butt welding jig for large-diameter, long-distance conveying pipelines according to claim 2, characterized in that: The top truss includes support vertical beams (23) on the left and right sides, and two support horizontal beams (24) are fixed between the support vertical beams (23) on the left and right sides. The support vertical beams (23) are connected and fixed to the main side pipe (22) by through bolts, and the hand hoist (25) is installed on the upper and lower support horizontal beams (24).

4. The multi-functional butt welding jig for large-diameter long-distance conveying pipelines according to claim 3, characterized in that: Two stabilizing rods (4) are fixedly connected between the upper parts of the main side tubes (22) of the adjacent H-type main support frame. The two stabilizing rods (4) are located at the position where the outer end of the main side tube (22) is connected to the support vertical beam (23). The support vertical beam (23), the main side tube (22) and the stabilizing rods (4) are connected and fixed by through bolts.

5. The multi-functional butt welding jig for large-diameter long-distance conveying pipelines according to claim 1, characterized in that: The ramp link (16), the upper crossbar (15) and the top crossbar (5) are connected by a hinge tee (28). The ramp link (16) can rotate arbitrarily relative to the upper crossbar (15) through the hinge tee (28).

6. The multi-functional butt welding jig for large-diameter long-distance conveying pipelines according to claim 1, characterized in that: The slope connecting rods (16) are connected by a through-threaded pipe clamp (21).

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