Cylindrical sheet manufacturing process

Abstract

The invention provides a cylinder piece manufacturing process. The cylinder piece manufacturing process comprises the steps that a cylinder body of a cylinder in the cylinder piece manufacturing process is divided based on hoisting and manufacturing modularization; according to a design drawing of the cylinder, the splicing number of the steel sheets is reduced, the weight of the steel sheets is reduced, and the sheet bodies of the cylinder body are reasonably divided according to factory production capacity requirements; manufacturing the sheet body by adopting a pre-arc process; and the cylinder bodies are manufactured on the basis of the sheet bodies, and the cylinder bodies are spliced into the cylinder. The pre-arc process is adopted for manufacturing the sheet body, and the method has the advantages of being good in sheet body forming effect, low in hoisting equipment requirement, low in transfer frequency and convenient to manufacture.

Description

Technical Field

[0001] The invention relates to the field of cylinder construction, and in particular to a cylinder sheet manufacturing process. Background Art

[0002] The steel cylinder construction technology is widely used in engineering construction, especially in ports, docks, breakwaters, revetments and other projects. The steel cylinder construction technology is to insert a thin-walled cylindrical shell with a large diameter and no internal partition into the foundation by vibration sinking, and use the embedding effect of the foundation to keep the steel cylinder stable. In water conservancy projects, the steel cylinder construction technology is used to intercept water flow in order to carry out foundation pit excavation, foundation construction and other operations; in port and coastal projects, the steel cylinder construction technology is used to prevent waves from impacting and damaging engineering facilities.

[0003] The construction process of steel cylinders usually includes prefabrication, transportation, foundation insertion, and backfilling and compaction. The prefabrication process is to make steel cylinders in factories or prefabrication areas according to design requirements. During the production process, the diameter, wall thickness, length and other parameters of the cylinders need to be strictly controlled to ensure that they meet the design requirements. The transportation process is to transport the prefabricated steel cylinders to the construction site. During the transportation process, necessary measures should be taken to protect the steel cylinders from damage. The foundation insertion process is to use a vibrating hammer or other equipment to insert the steel cylinder into the foundation in a vibrating manner. During the insertion process, parameters such as insertion depth, angle and speed are controlled to ensure the stability and safety of the steel cylinder. The backfilling and compaction process is to backfill soil and stone around the steel cylinder and compact it. The type and compaction degree of the backfill soil and stone need to be determined according to the design requirements.

[0004] For example, in a bridge tunnel artificial island project, an inserted large-diameter steel cylinder construction process was used. By inserting 120 steel cylinders weighing 500-800 tons on the seabed and filling them with soil, an artificial island was successfully built. The application of this steel cylinder construction technology not only speeds up the construction speed, but also reduces the project cost.

[0005] The steel cylinder manufacturing process involves not only material selection, but also a complex manufacturing process with multiple steps, such as cutting and pretreatment, bending, welding, surface processing, hoisting and transportation, etc. The quality of each link in the steel cylinder manufacturing process needs to be strictly controlled so that it can be better used in engineering construction. For steel cylinders with a single weight of 500-800 tons and a height of 40-70m, the diameter and height are quite large. Especially for the steel cylinder construction process with limited geological conditions, the height is equivalent to 20 floors and the diameter is very large to ensure sufficient stability and bearing capacity. However, the quality of the bending and welding processes in the steel cylinder manufacturing process directly affects the quality of engineering construction. How to ensure the quality of bending and welding has become an important link in the steel cylinder manufacturing process.

[0006] The steel cylinders used in large-scale projects are usually formed by precise splicing and welding of steel sheets to form steel cylinders with good stability and strong bearing capacity. Especially in large-scale infrastructure construction projects, the process of splicing steel sheets into steel cylinders is a complex and delicate project. First of all, the steel plate must meet the requirements of strength, toughness, corrosion resistance and other properties. During the rolling process, it is necessary to ensure that the steel plate can be smoothly rolled into a cylindrical shape without falling off. The rolling process needs to strictly control the rolling accuracy and curvature to ensure the roundness and verticality of the steel cylinder. Secondly, the rolled steel cylinder is spliced ​​by multiple steel sheets, and multiple steel sheets are tightly spliced ​​together by welding or bolting to form a complete steel cylinder. During the splicing process of steel sheets, it is necessary to ensure the flatness and sealing of the splicing seam to avoid problems such as leakage or seepage during subsequent use. Next, the welds and steel cylinders are post-processed.

[0007] Large-scale projects require a large number of steel cylinders. The process of making steel sheets and splicing and welding them into steel cylinders requires a lot of manpower, equipment, and time. The welding quality and progress of the steel sheets directly affect the quality and progress of the project. In addition, the process of making and splicing steel sheets requires high technical requirements for workers, which invisibly increases labor costs and project costs. How to save labor, facilitate production, and improve production efficiency in the process of making steel sheets has become a difficult problem that needs to be tackled in the production of steel cylinders. Summary of the invention

[0008] The object of the present invention is to provide a cylindrical sheet manufacturing process, which adopts a pre-arc process to manufacture the sheet body, and has the advantages of good sheet body forming effect, low lifting equipment requirements, less transportation times and convenient manufacturing.

[0009] The technical solution for achieving the purpose of the present invention is as follows: The present invention provides a cylindrical sheet manufacturing process, comprising: The cylinder body in the cylinder sheet manufacturing process is divided into the cylinder body based on lifting and manufacturing modularization; The sheets of the cylinder are reasonably divided according to the design drawings of the cylinder, the number of steel sheets to be spliced, the weight of the steel sheets to be reduced, and the production capacity of the factory; The sheet body is manufactured by using a pre-arcing process; The cylinder is manufactured based on the sheet, and the cylinder is spliced ​​into the cylinder.

[0010] In one embodiment of the present invention, the cylinder body of the cylinder in the cylinder sheet manufacturing process based on lifting and modularization of the manufacturing process comprises: Based on hoisting, the weight of a single section of the cylinder in the cylinder sheet manufacturing process is determined to be 200t-450t; Based on the convenience of modular production, the height of the cylinder is fixed at 25m, and the height of the uppermost cylinder body of the cylinder is deducted by at least 25m according to the total height of the cylinder.

[0011] In one embodiment of the present invention, the sheets of the cylinder are reasonably divided according to the design drawings of the cylinder, the number of steel sheets to be spliced, the weight of the steel sheets to be reduced, and the production capacity of the factory, including: The conditions that need to be met when dividing the cylinder body into single-segment pieces include: (1) meeting the design drawing requirements of the steel cylinder and reducing the number of steel plate splicing; (2) reducing the size and weight of the pieces and reducing the requirements for lifting equipment; (3) meeting the conventional procurement size requirements for the steel plates required for making the pieces; (4) meeting the overall production capacity of the factory; The sheet of the cylinder of a single segment is divided into 6 pieces along the vertical direction at 60 degrees, and the weight of a single sheet is 35t-75t; The width of a single sheet is 10m-15m, and the length of a single sheet is (Hn*25m)-25m.

[0012] In one embodiment of the present invention, the process of manufacturing the sheet body by using a pre-arc process includes: Cut the sheet body based on the steel plate in the factory, where the length of the sheet body is formed by splicing multiple pieces of the steel plate in the width direction, and the length of the steel plate is used as the width of the sheet body; After the steel plate groove is accepted, it is hoisted to the stand by crane, and the adjacent steel plates are connected on the stand smoothly without misalignment; Use the deadweight of the steel plate to pre-arc to 60° on the bench and check the gap between the steel plates again. First weld the code plates between the adjacent steel plates for positioning, then temporarily fix them along the joints with local skip welding, and then use manual gas shielded welding to weld them into shape in one step. Grind the weld and check the flatness of the steel plate to initially form a sheet. The flatness requirement shall not exceed 4mm / 2m; The sheet is fixed to process the annular reinforcing ribs and vertical T-ribs corresponding to the cylinder.

[0013] In one embodiment of the present invention, the fixing of the sheet body to process the annular reinforcing ribs and the vertical T-ribs corresponding to the cylinder includes: Temporarily fix the sheet and check its external dimensions to ensure that the external dimensions meet the requirements; Marking the installation position line of the annular reinforcing rib and the installation position line of the vertical T-rib on the sheet body, so that the installation position line of the vertical T-rib is parallel to the center line of the sheet body; Install the annular reinforcement ribs and the vertical T-ribs to their respective installation position lines, and use a fixing tool to fix the sheet body, the annular reinforcement ribs and the vertical T-ribs; The sheet body, annular reinforcement ribs and vertical T-ribs are welded by a CO2 welding trolley and passed the inspection.

[0014] In one embodiment of the present invention, the annular reinforcing ribs and the vertical T-ribs are installed to their respective installation position lines, and the sheet body, the annular reinforcing ribs and the vertical T-ribs are fixed by a fixing tool, including: Check the external dimensions of the sheet. If the dimensions meet the requirements of the specification, use ultrasonic wave to inspect the weld of the sheet. If the inspection is qualified, mark the installation position lines of the annular reinforcement and vertical T ribs. Using the center line of the sheet as a reference, draw lines on both sides of the sheet to ensure that the installation line of each vertical T-rib is parallel to the center line and the position deviation of each vertical T-rib assembly line is less than 2mm; Install vertical T-ribs and annular reinforcement plates according to the vertical T-rib assembly line to ensure the installation accuracy of vertical T-ribs and annular reinforcement plates; After the vertical T-ribs and annular reinforcement plates are installed and positioned using fixed fixtures, the dimensions of the sheet body, vertical T-ribs and annular reinforcement plates are inspected. If the dimensions are qualified, they are spot welded and fixed, and then the fixed fixtures are removed.

[0015] In one embodiment of the present invention, the sheet body, the annular reinforcement ribs and the vertical T-ribs are welded by a CO2 welding trolley and accepted as qualified, including: Use CO2 welding trolley to weld the fillet weld of vertical T rib; The sheet body is formed by arc pressing; After arc forming, the annular reinforcement ribs are welded.

[0016] In one embodiment of the present invention, the cylinder is manufactured based on the sheet, and the cylinder is spliced ​​into the cylinder, including: Splicing six sheets of the same specification into a ring and welding them to form a single-segment cylinder; At least two of the single-segment cylinders are spliced ​​and welded in the height direction to form the cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts the pre-arcing process to manufacture the sheet body, which has the advantages of good sheet body forming effect, low requirements for hoisting equipment, less transportation times and convenient manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A process flow chart of a cylindrical sheet manufacturing process provided by the present invention; Figure 2 A diagram of the cylinder provided by the present invention in sections; Figure 3 A diagram of a cylinder provided for the present invention; Figure 4 A flow chart of the pre-arcing process for making a sheet body in step 3 of the cylindrical sheet manufacturing process provided by the present invention; Figure 5 The present invention provides Figure 3 Medium AA and BB views; Figure numerals: 1-cylinder body; 2-sheet body; 3-cylinder; 4-docking port. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0020] A large-scale project uses a steel cylinder process to quickly form an island. During the construction of the project, the speed of making the steel cylinder sheet determines the progress of the steel cylinder forming. The production process of the sheet in the steel cylinder has an impact on the progress of the sheet. The embodiment of the present invention comprehensively considers the convenience of construction, material saving, labor saving and other aspects, and makes a lot of research on the sheet production process of the steel cylinder. Please refer to Figure 1 The embodiment of the present invention provides a cylindrical sheet manufacturing process, comprising the following steps: Step 1: Divide the cylinder body of the cylinder sheet manufacturing process based on lifting and production modularization.

[0021] In practical applications, step one is as follows: based on lifting and hoisting, the weight of a single segment of the cylinder in the cylinder sheet manufacturing process is determined to be 200t-450t; based on the convenience of modular manufacturing, the height of the cylinder is fixed to 25m, and the height of the uppermost cylinder body of the cylinder is deducted by at least 25m according to the total height of the cylinder.

[0022] The port area where the project is located is a typical offshore island and reef terrain. The project's dike uses vibrating steel cylinders to quickly close the dike. The project's steel cylinders are arranged along the axis of the dike, with a total of 124 steel cylinders, numbered T1~T124, with a diameter of 22 meters. The wall thickness of the steel cylinder is mainly 16mm and 25mm, and the material is Q355B. The main profiles are T250*200*10*16 and L160*100*16, and the material is Q235B. The cylinder height of the steel cylinder ranges from 43 meters to 62 meters, and the single cylinder weight of the steel cylinder ranges from 515.93t to 728.42t. The total weight of the steel cylinders required for the project is about 80,000 tons. Among them, the main body of the steel cylinder is a 16mm circumferential thin-walled structure. In order to meet the vibration and compression buckling stability of the top 1m and the bottom 0.5m, the steel cylinder body is reinforced with a 25mm circumferential steel plate, and the steel cylinder is provided with T-shaped stiffening ribs every 10° in the vertical direction to provide vertical stiffness; a number of circumferential reinforcement belts, circumferential reinforcement rings and reinforced vertical plates are arranged on the wall of the steel cylinder to meet the circumferential stiffness requirements of the steel cylinder during hoisting, transportation and vibration and sinking periods during construction.

[0023] Step 2: Rationally divide the cylinder body according to the cylinder design drawings, reduce the number of steel sheet splicing, reduce the weight of steel sheets and the factory production capacity requirements.

[0024] In practical applications, see Figure 2 , step 2 of the embodiment of the present invention is specifically as follows: the conditions to be met when dividing the sheet of a single-segment cylinder include: (1) meeting the design drawing requirements of the steel cylinder and reducing the number of steel plate splicing; (2) reducing the size and weight of the sheet and reducing the requirements for lifting and hoisting equipment; (3) meeting the conventional procurement size requirements of the steel plates required for making the sheet; (4) meeting the overall production capacity of the factory; the sheet of the single-segment cylinder is divided into 6 pieces along the vertical direction of 60°, and the weight of a single sheet is 35t-75t; the width of a single sheet is 10m-15m, and the length of a single sheet is (Hn*25m)-25m.

[0025] When the cylinder of the embodiment of the present invention is divided into single-segment cylinders, hoisting and manufacturing modularization are comprehensively considered. Figure 2 The cylinder division shown is to divide the cylinder into two sections, each section is divided into 6 vertical plates, and finally the vertical plates are folded together on the tire frame to complete the overall cylinder production. Figure 2 The lower section of the cylinder shown has a fixed length of 25m, and the length of the upper section is reduced by 25m according to the overall length of the steel cylinder. The weight of a single section cylinder is 228.29t~437.16t.

[0026] In order to ensure the processing of the sheet, the present invention embodiment studies the sheet division of a single-segment cylinder. Figure 3 The sheet division of the embodiment of the present invention should not only meet the design drawing requirements of the cylinder 3, reduce the number of steel plate splicing, but also reduce the size and weight of the sheet, and reduce the requirements for lifting and transportation equipment. At the same time, it is necessary to meet the conventional procurement size requirements of steel plates. Figure 3 and Figure 5 As shown, in the embodiment of the present invention, the cylinder 1 of the upper section and the cylinder 1 of the lower section are divided into 6 blocks along the vertical direction of 60 degrees in combination with the overall production capacity of the factory. Figure 3 and Figure 5 The width of each sheet body 2 shown is about 11.5 m, and the weight of a single sheet body 2 is 38.04 t to 72.86 t.

[0027] Step 3: Use pre-arcing technology to make the sheet.

[0028] For further information, see Figure 4 , step three of the embodiment of the present invention specifically includes: Step 31, cutting the sheet body based on the steel plate from the factory, wherein the length of the sheet body is formed by splicing multiple pieces in the width direction of the steel plate, and the length of the steel plate is used as the width of the sheet body. More specifically, when the sheet body is cut based on the steel plate from the factory in the embodiment of the present invention, (1) a steel plate material list and drawings are prepared, and the layout and cutting are performed according to the drawings. (2) The main parts of the cylinder body are flame cut, and the cutting is preferably controlled by numerical control. (3) Process requirements for flame cutting: Before flame cutting in the embodiment of the present invention, in order to verify the heat control technology, a flame cutting specimen test is also required to ensure that the heat control technology is effective, there are no cracks on the surface after flame cutting, and the local hardness does not exceed Hv(10)350; and there shall be no other defects that endanger the performance of the structure. The flame cutting trace line is removed by grinding or machining. (4) The size deviation of the sheet body after steel plate processing meets the requirements of the process technology documents or drawings.

[0029] Step 32: After the steel plate groove is inspected and accepted, it is hoisted to the stand by crane, and the adjacent steel plates are connected on the stand smoothly without misalignment. Figure 2 Taking the lower segment cylinder shown as an example, the sheet unit is 11.5m wide and 25m long, and is made up of multiple steel plates. When the plates are assembled, the length direction of the steel plates is used as the overall width of the sheet without overlap, and the length of the sheet is made up of multiple pieces of steel plates spliced ​​in the width direction. After the steel plate groove is completed and accepted, it is directly hoisted onto the platform by a crane, and the adjacent steel plates are connected smoothly without misalignment.

[0030] Step 33, use the deadweight of the steel plate to pre-arc to 60° on the test bench and check the gap between the steel plates again, first weld the code plates between adjacent steel plates for positioning, then temporarily fix them by local skip welding along the seams, and then use manual gas shielded welding to weld them in one go. The steel plates of the embodiment of the present invention are spliced ​​on a special tire frame, and the deadweight of the steel plate is used for pre-arc. After the sheet is put on the tire, the gap between the sheets is checked again, code plates are welded between adjacent sheets for positioning, and temporarily fix them by local skip welding along the seams. The steel plate of the embodiment of the present invention adopts a single-sided bevel, a ceramic liner is attached to the back, and is welded in one go by manual gas shielded welding. After the single sheet is spliced, the weld is polished and the flatness of the steel plate is checked. The flatness requirement shall not exceed 4mm / 2m.

[0031] Step 34: Grind the weld and check the flatness of the steel plate to initially form a sheet. The flatness requirement should not exceed 4mm / 2m.

[0032] Step 35, the fixed sheet is processed to form annular reinforcement ribs and vertical T-ribs corresponding to the cylinder.

[0033] Among them, the above-mentioned fixed sheet body processing corresponding to the annular reinforcement ribs and vertical T-ribs of the cylinder in the embodiment of the present invention includes: temporarily fixing the sheet body and checking its external dimensions to ensure that the external dimensions meet the requirements; marking the installation position lines of the annular reinforcement ribs and the vertical T-ribs on the sheet body, so that the installation position line of the vertical T-ribs is parallel to the center line of the sheet body; installing the annular reinforcement ribs and the vertical T-ribs to their respective installation position lines, and using fixed tooling to fix the sheet body, annular reinforcement ribs and vertical T-ribs; using a CO2 welding trolley to weld the sheet body, annular reinforcement ribs and vertical T-ribs and accept them as qualified.

[0034] More specifically, the annular reinforcement ribs and vertical T-ribs are installed to their respective installation position lines, and the sheet body, annular reinforcement ribs and vertical T-ribs are fixed with fixed fixtures, including: checking the outer dimensions of the sheet body, and after the dimensions meet the requirements of the specifications, using ultrasonic flaw detection to inspect the welds of the sheet body, and after the inspection is qualified, marking the installation position lines of the annular reinforcement and vertical T-ribs; using the center line of the sheet body as a reference, marking both sides of the sheet body to ensure that the installation line of each vertical T-rib is parallel to the center line, and the position deviation of each vertical T-rib assembly line is less than 2mm; installing the vertical T-ribs and annular reinforcement plates according to the vertical T-rib assembly line to ensure the installation accuracy of the vertical T-ribs and the annular reinforcement plates; after the vertical T-ribs and the annular reinforcement plates are installed and positioned with fixed fixtures, inspect the dimensions of the sheet body, the vertical T-ribs and the annular reinforcement plates, and fix them by spot welding if the dimensions are qualified, and then remove the fixed fixtures.

[0035] The above-mentioned CO2 welding trolley is used in the embodiment of the present invention to weld the sheet, annular stiffening ribs and vertical T-ribs and the acceptance is qualified, including: using the CO2 welding trolley to weld the fillet weld of the vertical T-rib; using the arc pressing method to press the sheet into shape; welding the annular stiffening ribs after arc pressing. It should be pointed out that in the embodiment of the present invention, after all welding is completed, the temporary tooling is removed, the part is polished and trimmed, and the sheet weld is accepted. Recheck the sheet size and the longitudinal and transverse stiffening rib positions, draw the longitudinal and transverse margin trimming lines according to the center reference line of the sheet, cut off the margin, make the sheet arc length reach the length of the drawing, and cut the sheet to close the welding groove as required.

[0036] It should be noted that the embodiment of the present invention adopts arc pressing to form the sheet body, and the sheet body is formed on a special tire frame in the workshop. The tire frame is arranged into an arc shape according to the outer diameter of the steel cylinder. The arc, strength, rigidity and stability of the tire frame need to be verified before use. The embodiment of the present invention adopts arc pressing after the sheet body is spliced, and the degree of automation is high.

[0037] The sheet of the embodiment of the present invention is hoisted to the arc pressing frame, and the sheet is pressed and formed by its own weight and a 5t counterweight. The longitudinal baseline of the sheet is pressurized to coincide with the longitudinal baseline of the frame, and is fixed by a temporary tool. Check whether the sheet is in close contact with the frame to determine the arc pressing state of the sheet.

[0038] Step 4: Make a cylinder based on the sheet and splice the cylinder into a cylinder. Step 4 of the embodiment of the present invention specifically includes: splicing 6 sheets of the same specification into a ring and welding to form a single-segment cylinder; splicing and welding at least two single-segment cylinders along the height direction to form a cylinder.

[0039] The pre-arc process of the embodiment of the present invention has a small site requirement and a single type of stand. The steel plates can be directly spliced ​​on the stand and formed by their own weight alone without the need for counterweights to press the arc. The forming is fast and effective, and the welding deformation is easy to control. After the panels are spliced, no transfer is required, the number of transfers is small, and the corresponding equipment requirements are small. It has obvious advantages under conditions of limited site.

[0040] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cylindrical sheet manufacturing process, characterized in that: include: The cylinder body in the cylinder sheet manufacturing process is divided into the cylinder body based on lifting and manufacturing modularization; The sheets of the cylinder are reasonably divided according to the design drawings of the cylinder, the number of steel sheets to be spliced, the weight of the steel sheets to be reduced, and the production capacity of the factory; The sheet body is manufactured by using a pre-arcing process; The cylinder is manufactured based on the sheet, and the cylinder is spliced ​​into the cylinder.

2. A cylindrical sheet manufacturing process according to claim 1, characterized in that: The cylinder body of the cylinder in the cylinder sheet manufacturing process based on lifting and modularization of manufacturing comprises: Based on hoisting, the weight of a single section of the cylinder in the cylinder sheet manufacturing process is determined to be 200t-450t; Based on the convenience of modular production, the height of the cylinder is fixed at 25m, and the height of the uppermost section of the cylinder is deducted by at least 25m according to the total height of the cylinder.

3. A cylindrical sheet manufacturing process according to claim 1, characterized in that: The cylinder body is divided into the following parts according to the design drawings of the cylinder, the number of steel sheets to be spliced, the weight of the steel sheets to be reduced, and the production capacity of the factory: The conditions that need to be met when dividing the cylinder body into single-segment pieces include: (1) meeting the design drawing requirements of the steel cylinder and reducing the number of steel plate splicing; (2) reducing the size and weight of the pieces and reducing the requirements for lifting equipment; (3) meeting the conventional procurement size requirements for the steel plates required for making the pieces; (4) meeting the overall production capacity of the factory; The sheet of the cylinder of a single segment is divided into 6 pieces along the vertical direction at 60 degrees, and the weight of a single sheet is 35t-75t; The width of a single sheet is 10m-15m, and the length of a single sheet is (Hn*25m)-25m.

4. A cylindrical sheet manufacturing process according to claim 1, characterized in that: The method of using a pre-arc process to manufacture the sheet body comprises: Cut the sheet body based on the steel plate in the factory, where the length of the sheet body is formed by splicing multiple pieces of the steel plate in the width direction, and the length of the steel plate is used as the width of the sheet body; After the steel plate groove is accepted, it is hoisted to the stand by crane, and the adjacent steel plates are connected on the stand smoothly without misalignment; Use the deadweight of the steel plate to pre-arc to 60° on the bench and check the gap between the steel plates again. First weld the code plates between the adjacent steel plates for positioning, then temporarily fix them along the joints with local skip welding, and then use manual gas shielded welding to weld them into shape in one step. Grind the weld and check the flatness of the steel plate to initially form a sheet. The flatness requirement shall not exceed 4mm / 2m; The sheet is fixed to process the annular reinforcing ribs and vertical T-ribs corresponding to the cylinder.

5. A cylindrical sheet manufacturing process according to claim 4, characterized in that: The fixing of the sheet body to process the annular reinforcing ribs and the vertical T-ribs corresponding to the cylinder comprises: Temporarily fix the sheet and check its external dimensions to ensure that the external dimensions meet the requirements; Marking the installation position line of the annular reinforcing rib and the installation position line of the vertical T-rib on the sheet body, so that the installation position line of the vertical T-rib is parallel to the center line of the sheet body; Install the annular reinforcement ribs and the vertical T-ribs to their respective installation position lines, and use a fixing tool to fix the sheet body, the annular reinforcement ribs and the vertical T-ribs; The sheet body, annular reinforcement ribs and vertical T-ribs are welded by a CO2 welding trolley and passed the inspection.

6. A cylindrical sheet manufacturing process according to claim 5, characterized in that: Install the annular reinforcement ribs and the vertical T-ribs to their respective installation position lines, and use a fixing tool to fix the sheet body, the annular reinforcement ribs and the vertical T-ribs, including: Check the dimensions of the sheet. If the dimensions meet the requirements of the specification, use ultrasonic wave to inspect the weld of the sheet. If the inspection is qualified, mark the installation position lines of the annular reinforcement and vertical T ribs. Using the center line of the sheet as a reference, draw lines on both sides of the sheet to ensure that the installation line of each vertical T-rib is parallel to the center line and the position deviation of each vertical T-rib assembly line is less than 2mm; Install vertical T-ribs and annular reinforcement plates according to the vertical T-rib assembly line to ensure the installation accuracy of vertical T-ribs and annular reinforcement plates; After the vertical T-ribs and annular reinforcement plates are installed and positioned using fixed fixtures, the dimensions of the sheet body, vertical T-ribs and annular reinforcement plates are inspected. If the dimensions are qualified, they are spot welded and fixed, and then the fixed fixtures are removed.

7. A cylindrical sheet manufacturing process according to claim 5, characterized in that: The sheet body, annular reinforcement ribs and vertical T-ribs are welded by CO2 welding trolley and accepted as qualified, including: Use CO2 welding trolley to weld the fillet weld of vertical T rib; The sheet body is formed by arc pressing; After arc forming, the annular reinforcement ribs are welded.

8. A cylindrical sheet manufacturing process according to claim 1, characterized in that: The method comprises: manufacturing the cylinder body based on the sheet body, and splicing the cylinder body into the cylinder, comprising: Splicing six sheets of the same specification into a ring and welding them to form a single-segment cylinder; At least two of the single-segment cylinders are spliced ​​and welded along the height direction to form the cylinder.

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