Long-distance pipeline construction method

Abstract

The invention provides a long-distance pipeline construction method, which belongs to the technical field of pipeline construction and comprises the following steps: acquiring the number Q of standard-length welded pipes required by construction of a section of long-distance pipeline; q standard-length welded pipes are prepared in a welded pipe machining site; the Q standard-length welded pipes are divided into M pipe connecting sets, and the number of the standard-length welded pipes in each pipe connecting set is not less than two; the two or more standard-length welded pipes in the pipe connecting set are in butt joint and welded into a prefabricated pipeline section; the prefabricated pipeline section is detected; and the multiple prefabricated pipeline sections which are detected to be qualified are transported to a long-distance pipeline for construction, and the multiple prefabricated pipeline sections are connected into the long-distance pipeline through welding. According to the long-distance pipeline construction method provided by the invention, a plurality of standard-length welded pipes forming a section of long-distance pipeline are pre-connected into the prefabricated pipeline sections in a processing site, so that the welding frequency required by butt joint of the welded pipes on a long-distance pipeline construction site is reduced, the construction amount of the long-distance pipeline construction site is reduced, and the construction efficiency is improved. The construction time and cost are greatly reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline construction, and more specifically, relates to a long-distance pipeline construction method. Background Art

[0002] Long-distance pipelines, also known as long-distance transmission pipelines, primarily involve connecting multiple standard-length welded pipes one by one to form the pipeline. Therefore, pairing and welding each pipe is a key task in pipeline construction. The process of pairing pipes involves lifting the pre-connected pipes using a pipe lifter and then moving them up and down, left and right, to align them with the pipes to be connected. Once the butt gap and misalignment between the two pipes meet the requirements, they are first spot-welded to secure them. Depending on the pipe diameter, wall thickness, and steel grade, internal welding with fully automatic gas shielded welding and external welding with fully automatic gas shielded welding for filling and capping are then performed. Since the pipes to be connected are already fixed during the welding process, the welding torch rotates while the pipes remain stationary. Therefore, the torch must weld the pipes in all positions, including uphill, downhill, horizontal, and overhead welding. However, compared with horizontal welding of welded pipes, the full-position welding process of welded pipes is difficult and time-consuming, which greatly affects the construction efficiency of the entire long-distance pipeline construction. Summary of the Invention

[0003] The purpose of the present invention is to provide a long-distance pipeline construction method, aiming to improve the pipeline construction efficiency.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a long-distance pipeline construction method, comprising the following steps: S1. Obtain the quantity Q of standard length welded pipes required for the construction of a long-distance pipeline; S2. Prepare Q standard length welded pipes at the welded pipe processing site; S3. Divide the Q standard-length welded pipes into M joint pipe groups, with each joint pipe group containing no less than two standard-length welded pipes; S4. transporting two or more standard length welded pipes in the pipe joint group to a welding workbench, sequentially butting the two or more standard length welded pipes, and spot welding the butted ends of two adjacent standard length welded pipes after they are aligned, so that the two or more standard length welded pipes form a prefabricated pipe segment; S5. Fixing the welding gun at the inner butt joint of two adjacent standard-length welded pipes on the prefabricated pipe segment, controlling the workbench to rotate the prefabricated pipe segment, and completing welding the inner weld of the prefabricated pipe segment. Then, fixing the welding gun at the outer butt joint of two adjacent standard-length welded pipes on the prefabricated pipe segment, controlling the welding workbench to rotate the prefabricated pipe segment, and completing welding the outer weld of the prefabricated pipe segment. S6. Inspect the prefabricated pipeline section and perform anti-corrosion treatment on the butt joint of two adjacent standard-length welded pipes within the prefabricated pipeline section; S7. Transport multiple qualified prefabricated pipeline sections to the long-distance pipeline construction site and connect the multiple prefabricated pipeline sections into a long-distance pipeline by welding.

[0005] In a possible implementation, in step S3, the perimeter difference between the pipe ends of any two standard-length welded pipes in the pipe coupling group is not greater than 3 mm.

[0006] In a possible implementation, in step S4, the alignment method for the butt ends of two adjacent standard-length welded pipes includes, before the standard-length welded pipes are transported to the welding operation table, pre-marking the maximum and minimum diameter positions at the pipe ends of each standard-length welded pipe. After the standard-length welded pipes are transported to the welding operation table, control the welding operation table to adjust the positions of the standard-length welded pipes so that the maximum and minimum diameter positions of the butt ends of two adjacent standard-length welded pipes correspond to each other.

[0007] In a possible implementation, in step S5, for the external welding of the prefabricated pipeline section, use carbon dioxide gas shielded welding for backing, submerged arc welding for filling, and surfacing; for the internal welding of the prefabricated pipeline section, use carbon dioxide gas shielded welding for root welding.

[0008] In a possible implementation, in step S6, the inspection of the prefabricated pipeline section includes visual inspection, geometric dimension inspection, and non-destructive flaw detection of the welded joints of the prefabricated pipeline section.

[0009] In a possible implementation, before step S7, it is also necessary to perform sandblasting treatment on the welded joints of the prefabricated pipeline section and perform joint anti-corrosion treatment with a heat shrinkable tape.

[0010] In a possible implementation, the welding operation table includes a base, and there are two working station sections on the base for placing welded pipes. The working station sections are provided with a conveying roller group and a rotating roller group. The conveying roller group abuts against the welded pipe and is used to horizontally move the welded pipe to make the welded pipes on the two working station sections approach each other. The rotating roller group abuts against the welded pipe and is used to drive the welded pipe to rotate.

[0011] In a possible implementation, a first lifting platform is provided on the working station section, the conveying roller group is arranged on the first lifting platform, and second lifting platforms are provided on both sides of the first lifting platform along the welded pipe conveying direction. The rotating roller group is arranged on the second lifting platform.

[0012] In a possible implementation, the rotating roller group includes a driving group and a driven group, and the driving group is arranged on the second lifting platform at one end where the two working station sections approach each other.

[0013] In a possible implementation, the driving group includes a driving roller and a driven roller. The driving roller and the driven roller are respectively arranged on both sides of the transmission direction of the welded pipe, and the driving rollers located on the two working station sections are arranged on the same side. One of the driving rollers is in transmission connection with a motor, and the two driving rollers are in transmission connection through a universal coupling.

[0014] The beneficial effect of a long-distance pipeline construction method provided by the present invention lies in that: compared with the prior art, in the long-distance pipeline construction method of the present invention, by pre-connecting multiple standard-length welded pipes constituting a section of long-distance pipeline at the processing site into a prefabricated pipeline section, the number of welds required for butt welding of the welded pipes at the long-distance pipeline construction site is reduced, the construction volume at the long-distance pipeline construction site is reduced, the construction time and cost are greatly reduced, and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a step diagram of a long-distance pipeline construction method provided by an embodiment of the present invention; Figure 2 It is a schematic cross-sectional view of the groove of a thin-walled welded pipe provided by an embodiment of the present invention; Figure 3 It is a schematic cross-sectional view of the groove of a thick-walled welded pipe provided by an embodiment of the present invention; Figure 4 It is a front view structural schematic diagram of a welding operation table provided by an embodiment of the present invention; Figure 5 It is along Figure 4 The sectional view taken along line A-A in

[0017] Description of the reference numerals: 1, base; 11, first working station section; 12, second working station section; 2, first lifting platform; 21, conveying roller group; 3, second lifting platform; 31, driving group; 311, driving roller; 312, driven roller; 32, driven group; 4, driving motor; 5, universal coupling; 100, welded pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Please refer to Figure 1 , and now a construction method for a long-distance pipeline is provided by the present invention for description. The construction method for a long-distance pipeline includes the following steps: S1. Obtain the quantity Q of standard-length welded pipes required for the construction of a section of long-distance pipeline; S2. Prepare Q standard-length welded pipes at the welded pipe processing site; S3. Divide the Q standard-length welded pipes into M pipe connection groups, and the number of standard-length welded pipes in each pipe connection group is not less than two; S4. Transport two or more standard-length welded pipes in the pipe connection group to the welding workbench, align the two or more standard-length welded pipes in sequence, and perform spot welding fixation after the butt ends of adjacent two standard-length welded pipes are aligned, so that two or more standard-length welded pipes form a prefabricated pipeline section; S5. Fix the welding torch at the internal butt joint of two adjacent standard-length welded pipes on the prefabricated pipeline section, control the workbench to rotate the prefabricated pipeline section, complete the welding of the internal weld of the prefabricated pipeline section, and then fix the welding torch at the external butt joint of two adjacent standard-length welded pipes on the prefabricated pipeline section, control the workbench to rotate the prefabricated pipeline section, and complete the welding of the external weld of the prefabricated pipeline section; S6. Detect the prefabricated pipeline section, and perform anti-corrosion treatment on the butt joint of two adjacent standard-length welded pipes inside the prefabricated pipeline section; S7. Transport multiple qualified prefabricated pipeline sections to the long-distance pipeline construction site, and connect the multiple prefabricated pipeline sections into a long-distance pipeline through welding.

[0020] Among them, in step S3, when grouping the Q standard-length welded pipes, it is necessary to measure the pipe end circumference of each standard-length welded pipe in advance, record the pipe end circumference of each standard-length welded pipe, and classify the standard-length welded pipes with a pipe end circumference difference within 3 mm among the Q standard-length welded pipes into one category. The standard-length welded pipes of the same category can be assigned to the same pipe connection group, that is, the pipe end circumference difference between any two standard-length welded pipes in the same pipe connection group is less than 3 mm.

[0021] After the grouping is completed, it is necessary to machine the bevel at the pipe end of the standard-length welded pipes in each pipe connection group. When machining the bevel, it is necessary to design the shape of the bevel according to the wall thickness of the welded pipe. Among them, for welded pipes with a relatively thin wall thickness, a single-sided V-shaped bevel is usually used, as Figure 2 shown; for welded pipes with a relatively thick wall thickness, a composite bevel is usually used, as Figure 3As shown

[0022] Before performing step S4, that is, before the standard-length welded pipes are transported to the welding workbench, it is also necessary to pre-mark the positions of the maximum and minimum diameters at the pipe ends of the standard-length welded pipes in each pipe coupling group. When performing step S4, the operation of aligning the butt ends of two adjacent standard-length welded pipes is as follows: First, the standard-length welded pipes are sequentially transported to the welding workbench. By controlling the welding workbench to adjust the positions of the standard-length welded pipes, the butt ends of two adjacent standard-length welded pipes are brought closer to each other. Then, by rotating the standard-length welded pipes, the positions of the marked maximum and minimum diameters on the two adjacent standard-length welded pipes are made to correspond to reduce the misalignment. After that, the two adjacent standard-length welded pipes are further moved to make them butt against each other. After butt-jointing, the two adjacent standard-length welded pipes are fixed to each other by spot welding, so that these two adjacent standard-length welded pipes can form a prefabricated pipeline segment.

[0023] In this embodiment, before performing step S5, in order to ensure the welding strength of the two standard-length welded pipes fixed by spot welding, tack welding is also required. During tack welding, the welding torch is set at the highest point outside the welded pipe and is located at the butt joint of the two standard-length welded pipes. The tack welding can be carried out by automatic gas-shielded arc welding with carbon dioxide. After the tack welding starts, the welding torch remains unchanged, and the welding workbench drives the prefabricated pipeline segment to rotate, thus completing the tack welding. During tack welding, by rotating the prefabricated pipeline segment and fixing the welding torch, it can be ensured that the weld spots are fixed at the horizontal position without change, the welding conditions are good, no special all-position welding equipment is required, and the welding quality is easy to ensure.

[0024] After completing the tack welding, step S6 is performed. In step S6, it is necessary to first perform internal welding on the prefabricated pipeline segment. The internal welding is carried out by root welding with automatic gas-shielded arc welding using carbon dioxide. Before the internal welding starts, the welding torch is fixed at the lowest point inside the prefabricated pipeline segment and is located at the butt joint of the two standard-length welded pipes. After the internal welding starts, the welding torch does not move, and the welding machine workbench drives the prefabricated pipeline segment to rotate, thus completing the internal welding of the prefabricated pipeline segment. During the internal welding process, since the welding torch does not move, the weld spots can be fixed at the horizontal position without change, the welding conditions are good, no special all-position welding equipment is required, and the welding quality is easy to ensure. Using automatic gas-shielded arc welding with carbon dioxide does not require the transportation, recycling of welding flux, and cleaning of welding slag, etc.

[0025] After the internal welding of the prefabricated pipeline section is completed, external welding of the prefabricated pipeline section is still required. For external welding, automatic CO₂ gas shielded welding can be used for backing welding, submerged arc automatic welding for filling, and surfacing. Before the start of external welding, fix the welding torch at the highest point outside the prefabricated pipeline section, which is at the butt joint of two standard-length welded pipes. After the start of external welding, keep the welding torch stationary and drive the prefabricated pipeline section to rotate by the welding machine workbench, thus completing the external welding of the prefabricated pipeline section. During the external welding process, since the welding torch is stationary, the welding points can be fixed at the horizontal position, the welding conditions are good, and the welding quality is easy to ensure. Because the welding points are fixed at the horizontal position, the conditions for submerged arc automatic welding are met, and submerged arc automatic welding has relatively high production efficiency and good quality. When using submerged arc welding for external welding of the prefabricated pipeline section, different numbers of welding wires can be selected according to the pipe diameter and wall thickness of the welded pipe for welding.

[0026] After step S5 is completed, step S6 is entered to inspect the welded prefabricated pipeline section. When inspecting, do not remove the prefabricated pipeline section from the welding workbench first. First, inspect the appearance and dimensions of the prefabricated pipeline section, and then perform non-destructive inspection on the internal and external welds of the prefabricated pipeline section by RT ray flaw detection plus UT ultrasonic flaw detection. When performing non-destructive inspection, the probe is at the highest point outside the welded pipe and is fixed at the horizontal position. Drive the prefabricated pipeline section to rotate by the welding workbench, thus completing the inspection of the internal and external welds of the prefabricated pipeline section. During the non-destructive inspection process, since the probe is fixed at the horizontal position, the inspection conditions are good, greatly reducing the difficulty of the probe tracking the weld, and the non-destructive inspection quality is easy to ensure. After the prefabricated pipeline section passes the inspection, remove the prefabricated pipeline section from the welding workbench, then perform sandblasting treatment on the welded part of the prefabricated pipeline section and perform joint anti-corrosion treatment with a heat shrinkable tape, and store it in the warehouse for standby. When the prefabricated pipeline section fails the inspection, it is necessary to repair the defective part by welding. After welding, perform step S6 again until the prefabricated pipeline section passes the inspection, then remove it from the welding workbench, and then perform sandblasting treatment on the butt joint of two adjacent standard-length welded pipes inside the prefabricated pipeline section and perform joint anti-corrosion treatment with a heat shrinkable tape, and store it in the warehouse for standby.

[0027] After all the standard-length welded pipes in the M pipe coupling groups are welded to form M prefabricated pipeline sections, transport all the prefabricated pipeline sections to the long-distance pipeline site and weld and connect the M prefabricated pipeline sections to form a long-distance pipeline.

[0028] A construction method for a long-distance pipeline provided by the present invention, compared with the prior art, by pre-connecting multiple standard-length welded pipes that make up a section of long-distance pipeline at the processing site into prefabricated pipeline sections, thus reducing the number of welds required for butt welding of welded pipes at the long-distance pipeline construction site, reducing the construction volume at the long-distance pipeline construction site, greatly reducing the construction time and cost, and improving the construction efficiency.

[0029] The welding workbench involved in the long-distance pipeline construction method provided by the present invention is now described. Figures 4 to 5 The welding workbench includes a base 1, on which are provided two workstations for placing the welded pipe 100, and on which are provided a conveying roller group 21 and a rotating roller group. The conveying roller group 21 abuts against the welded pipe 100 and is used to move the welded pipe 100 horizontally so that the welded pipes 100 located on the two workstations are close to each other, and the rotating roller group abuts against the welded pipe 100 and is used to drive the welded pipe 100 to rotate. A first lifting platform 2 is provided on the workstation, and the conveying roller group 21 is provided on the first lifting platform 2. A second lifting platform 3 is provided on both sides of the first lifting platform 2 along the conveying direction of the welded pipe 100, and the rotating roller group is provided on the second lifting platform 3. Optionally, the rotating roller group includes a driving group 31 and a driven group 32. The driving group 31 is provided on the second lifting platform 3 located at one end where the two workstations are close to each other.

[0030] In application, the two working sections can be divided into a first working section 11 and a second working section 12. When in use, the first lifting platform 2 located on the first working section 11 and the second working section 12 is first raised, and the two welded pipes 100 are placed on the first lifting platform 2 on the first working section 11 and the second working section 12 respectively with the help of a lifting device, so that the welded pipes 100 are in contact with the conveying roller group 21, and the conveying roller group 21 supports the welded pipe 100. The conveying roller group 21 is driven to rotate by an external motor, so that the two welded pipes 100 located on the first working section 11 and the second working section 12 are close to each other and docked, and the first lifting platform 2 is adjusted. The height of the platform 2 aligns the ends of the two welded pipes 100. After the ends of the two welded pipes 100 are aligned, the two welded pipes 100 are fixed to each other by spot welding, and then the second lifting platform 3 on the first work section 11 and the second work section 12 is raised to make the rotating roller group abut against the welded pipe 100. Then the first lifting platform 2 on the first work section 11 and the second work section 12 is lowered to make the conveying roller group 21 away from the welded pipe 100. At this time, the rotating roller group supports the welded pipe 100. When the welded pipe 100 needs to be rotated, the rotating roller group is driven to rotate by an external motor, which can drive the steel pipe to rotate, making it convenient for the two welded pipes 100 to be butt-welded.

[0031] Furthermore, the drive group 31 includes a driving roller 311 and a driven roller 312, which are respectively arranged on both sides of the transmission direction of the welded pipe 100. The driving rollers 311 located at the two workstations are arranged on the same side. One of the driving rollers 311 is connected to the drive motor 4, and the two driving rollers 311 are connected to each other via a universal joint 5. In this embodiment, the universal joint 5 is a telescopic universal joint 5. Through the above arrangement, it is possible to use a single driving motor 4 to drive the rotation of two welded pipes 100 at the same time, thereby avoiding a speed difference between the rotation of the two welded pipes 100.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A construction method for long-distance pipelines, characterized in that It includes the following steps: S1. Obtain the quantity Q of standard-length welded pipes required for the construction of a long-distance pipeline; S2. Prepare Q standard-length welded pipes at the welded pipe processing site; S3. Divide the Q standard-length welded pipes into M pipe coupling groups, and the number of standard-length welded pipes in each pipe coupling group is not less than two; S4. Transport two or more standard-length welded pipes in the pipe coupling group to the welding workbench, align the two or more standard-length welded pipes in sequence, and perform spot welding fixation after the butt ends of adjacent two standard-length welded pipes are aligned, so that two or more standard-length welded pipes form a prefabricated pipeline segment; S5. Fix the welding torch at the internal butt joint of two adjacent standard-length welded pipes on the prefabricated pipeline segment, control the workbench to rotate the prefabricated pipeline segment to complete the welding of the internal weld of the prefabricated pipeline segment, and then fix the welding torch at the external butt joint of two adjacent standard-length welded pipes on the prefabricated pipeline segment, control the welding workbench to rotate the prefabricated pipeline segment to complete the welding of the external weld of the prefabricated pipeline segment; S6. Detect the prefabricated pipeline segment and perform anti-corrosion treatment on the butt joint of two adjacent standard-length welded pipes inside the prefabricated pipeline segment; S7. Transport multiple qualified prefabricated pipeline segments to the long-distance pipeline construction for construction, and connect the multiple prefabricated pipeline segments into a long-distance pipeline by welding.

2. The construction method of a long-distance pipeline as described in claim 1, characterized in that In step S3, the perimeter difference between the pipe ends of any two standard-length welded pipes in the pipe coupling group is not greater than 3 mm.

3. The construction method of a long-distance pipeline as claimed in claim 1, wherein, In step S4, the alignment method of the butt ends of two adjacent standard-length welded pipes includes, before the standard-length welded pipes are transported to the welding workbench, pre-marking the maximum and minimum diameter positions at the pipe ends of each standard-length welded pipe, and after the standard-length welded pipes are transported to the welding workbench, controlling the welding workbench to adjust the positions of the standard-length welded pipes so that the maximum and minimum diameter positions of the butt ends of adjacent two standard-length welded pipes correspond to each other.

4. A construction method for a long-distance pipeline as claimed in claim 1, characterized in that In step S5, for the external welding of the prefabricated pipeline segment, CO2 gas shielded welding is used for backing welding, submerged arc welding is used for filling and surfacing, and for the internal welding of the prefabricated pipeline segment, CO2 gas shielded welding is used for root welding.

5. A construction method for a long-distance pipeline as described in claim 1, characterized in that In step S6, the detection of the prefabricated pipeline segment includes visual inspection, geometric dimension inspection and non-destructive flaw detection of the welded joints of the prefabricated pipeline segment.

6. The construction method of a long-distance pipeline as claimed in claim 1, wherein, Before step S7, it is also necessary to perform sandblasting treatment on the welded joints of the prefabricated pipeline segment and perform joint anti-corrosion treatment with a heat shrinkable tape.

7. A construction method for a long-distance pipeline as described in claim 1, characterized in that, The welding workbench includes a base, and two working sections for placing welded pipes are provided on the base. A conveying roller group and a rotating roller group are provided on the working section. The conveying roller group abuts against the welded pipe and is used for horizontally moving the welded pipe to make the welded pipes located on the two working sections approach each other. The rotating roller group abuts against the welded pipe and is used for driving the welded pipe to rotate.

8. A construction method for long-distance pipeline construction as described in claim 7, characterized in that, A first lifting platform is provided on the working section, the conveying roller group is arranged on the first lifting platform, and second lifting platforms are provided on both sides of the first lifting platform along the welded pipe conveying direction. The rotating roller group is arranged on the second lifting platform.

9. A construction method for long-distance pipeline construction as described in claim 8, characterized in that, The rotating roller group includes a driving group and a driven group, and the driving group is arranged on the second lifting platform at one end where the two working sections approach each other.

10. A construction method for long-distance pipeline construction according to claim 9, characterized in that, The driving group includes a driving roller and a driven roller. The driving roller and the driven roller are respectively arranged on both sides of the transmission direction of the welded pipe. The driving rollers located on the two station sections are arranged on the same side. One of the driving rollers is in transmission connection with a motor, and the two driving rollers are in transmission connection through a universal coupling.

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