Method for manufacturing a steel pipe cylinder structure

Abstract

The application provides a manufacturing method of a steel pipe cylinder structure, comprising the following steps: step A: arranging a first steel pipe to be welded in a limiting groove; arranging an I-shaped steel to be welded on a first boss, so that an outer first flange is in contact with the first boss; step B: arranging a welding device on the inner side of a rotating frame, and welding and connecting an inner second flange and the first steel pipe; step C: rotating the rotating frame, continuously arranging the first steel pipe and the I-shaped steel, and repeating steps A and B to complete welding between the second flange and the first steel pipe; and step D: moving the welding device to the outer side of the rotating frame, rotating the rotating frame, and welding and connecting all the first flanges and the first steel pipe.

Description

Technical Field

[0001] This application belongs to the field of building equipment and relates to a manufacturing device and method for a steel pipe cylindrical structure. Background Technology

[0002] In the manufacture of large-diameter cylinders, vertical welding and splicing are the primary methods used to assemble them. For example, Chinese patent application CN103157955A discloses a method for manufacturing a large-diameter steel cylinder. This method divides the entire cylinder into an upper plate unit with multiple plates and a lower plate unit with multiple plates. After splicing the individual plates of the upper and lower plate units separately, the upper and lower plate units are then vertically joined together. This manufacturing method is complex and places high demands on lifting and moving equipment. Summary of the Invention

[0003] This application provides a device and method for manufacturing a steel pipe cylindrical structure. The device is simple and the manufacturing method is convenient.

[0004] The first aspect of this application provides an apparatus for manufacturing a steel pipe cylindrical structure, wherein the steel pipe cylindrical structure includes a plurality of first steel pipes and an I-beam connecting two adjacent first steel pipes. The I-beam has a first flange on an outer side and a second flange on an inner side, which are parallel to each other, and a web connecting the first flange and the second flange. The two ends of the first flange and the second flange are respectively connected to the two adjacent first steel pipes. The plurality of first steel pipes and the plurality of I-beams connecting them are arranged to form the steel pipe cylindrical structure. The manufacturing apparatus includes:

[0005] The base has a first groove with a concave surface in the shape of an arc;

[0006] The rotating frame is annular; it has an outer surface that matches the first groove of the base, allowing the rotating frame to rotate in the first groove; it also has an inner surface that can accommodate the steel pipe cylindrical structure; wherein, the inner surface of the rotating frame is provided with an inwardly protruding first boss for supporting the first flange of the I-beam, and a limiting groove that can accommodate the first steel pipe is formed between two adjacent first bosses.

[0007] A drive unit, mounted on a pedestal, is used to drive the rotating frame to rotate; and

[0008] The welding device, which is height adjustable, is used to weld the second flange to the first steel pipe on the inside of the rotating frame and to weld the first flange to the first steel pipe on the outside of the rotating frame.

[0009] In some embodiments of this application, the steel pipe cylindrical structure further includes second steel pipes with a diameter smaller than the first steel pipe, fewer in number than the first steel pipes, and spaced apart on the steel pipe cylindrical structure, for connecting two adjacent first steel pipes to replace the I-beams at that location; the steel pipe cylindrical structure simultaneously has I-beams and second steel pipes; the inner surface of the rotating frame is also provided with an inwardly protruding second boss for supporting the second steel pipe, the second boss having an arc-shaped second groove matching the outer surface of the second steel pipe; the limiting groove is formed between the second boss and the adjacent first boss.

[0010] In some embodiments of this application, the manufacturing apparatus includes a plurality of spaced-apart rotating frames, with a gap zone formed between adjacent rotating frames, in which the welding of the first flange and the first steel pipe is performed. As one embodiment, the manufacturing apparatus further includes a pushing device capable of axially moving the steel pipe cylindrical structure.

[0011] In some embodiments of this application, the driving device includes a power gear set and a motor for driving the power gear set to rotate; wherein the power gear set includes a plurality of rotatable gears, which respectively contact the outer surface of the rotating frame to drive the rotating frame to rotate.

[0012] In some embodiments of this application, the manufacturing apparatus includes a limiting device to prevent the steel pipe cylindrical structure from detaching. As one embodiment, the limiting device is a magnetic attraction device installed in the rotating frame near the first boss, the second boss, and the limiting groove, to magnetically attract the first steel pipe, the second steel pipe, and the I-beam. As another embodiment, the limiting device has an L-shaped structure, with its first end hinged to the rotating frame and its second end capable of extending into the gap formed by the first steel pipe, the second steel pipe, or the first flange and the web, to fix the first steel pipe, the second steel pipe, or the I-beam.

[0013] In some embodiments of this application, the manufacturing apparatus further includes a support frame having two legs and a crossbeam located between the two legs; the crossbeam is parallel to the axial direction of the first steel pipe; the welding device is movably mounted on the crossbeam. The support frame is detachable, and the height of the legs is adjustable to adjust the welding device to the inside or outside of the rotating frame.

[0014] In some embodiments of this application, the limiting groove is a concave arc shape that matches the outer surface of the first steel pipe, used to limit the position of the first steel pipe. The motor is a stepper motor. The multiple rotating frames can rotate synchronously.

[0015] The second aspect of this application provides a method for manufacturing a steel pipe cylindrical structure, wherein the steel pipe cylindrical structure includes a plurality of first steel pipes and an I-beam connecting two adjacent first steel pipes. The I-beam has a first flange on an outer side and a second flange on an inner side, which are parallel to each other, and a web connecting the first flange and the second flange. The two ends of the first flange and the second flange are respectively connected to the two adjacent first steel pipes. The manufacturing apparatus includes: a platform having a first groove with a concave surface in the shape of an arc; and a rotating frame, which is annular and has an outer surface that matches the first groove of the platform, such that... The rotating frame is rotatable in the first groove and has an inner surface capable of accommodating the steel pipe cylindrical structure. The inner surface of the rotating frame is provided with an inwardly protruding first boss for supporting the first flange of the I-beam, and a limiting groove for accommodating the first steel pipe is formed between two adjacent first bosses. A driving device, mounted on a base, is used to drive the rotating frame to rotate. A welding device, with adjustable height, is used to weld the second flange to the first steel pipe on the inner side of the rotating frame and to the first flange to the first steel pipe on the outer side of the rotating frame. The manufacturing method includes the following steps:

[0016] Step A: Place the first steel pipe to be welded in the limiting groove at the bottom of the rotating frame; place the I-beam to be welded on the first boss at the bottom of the rotating frame, so that the outermost first flange contacts the first boss; at this time, the two ends of the first and second flanges of the I-beam are respectively close to the two adjacent first steel pipes.

[0017] Step B: Arrange the welding device inside the rotating frame and weld the second flange and the first steel pipe on the inner side.

[0018] Step C: Rotate the rotating frame to continue arranging the first steel pipe and I-beam. Repeat steps A and B to complete the welding between the second flange and the first steel pipe.

[0019] Step D: Move the welding device to the outside of the rotating frame, rotate the rotating frame, and weld all the first flanges and the first steel pipes together.

[0020] In some embodiments of this application, the steel pipe cylindrical structure further includes second steel pipes with a diameter smaller than the first steel pipe, fewer in number than the first steel pipes, and spaced apart on the steel pipe cylindrical structure, for connecting two adjacent first steel pipes to replace the I-beams there; the steel pipe cylindrical structure simultaneously has I-beams and second steel pipes; the inner surface of the rotating frame is also provided with an inwardly protruding second boss for supporting the second steel pipe, the second boss having an arc-shaped second groove matching the outer surface of the second steel pipe; the limiting groove is formed between the second boss and the adjacent first boss; step A further includes arranging the second steel pipe to be welded on the second boss at the lower part of the rotating frame, at which time the second steel pipe is close to two adjacent first steel pipes respectively; step B further includes welding the first steel pipe and the second steel pipe together; step C further includes continuing to arrange the second steel pipe, repeating steps A and B, to complete the welding between the first steel pipe and the second steel pipe; step D further includes supplementary welding between the first steel pipe and the second steel pipe from the outside of the rotating frame.

[0021] In some embodiments of this application, the manufacturing apparatus includes multiple spaced rotating frames and a pushing device capable of axially moving the steel pipe cylindrical structure. A gap zone is formed between adjacent rotating frames, and the welding of the first flange and the first steel pipe is carried out in the gap zone. In step D, the first flange and the first steel pipe located in the gap zone are first welded, and then the unwelded first flange and the first steel pipe are moved to the gap zone for welding using the pushing device.

[0022] In some embodiments of this application, in step B, a limiting device is arranged to prevent the steel pipe cylindrical structure from detaching. As one embodiment, the limiting device is a magnetic attraction device installed in the rotating frame near the first boss, the second boss, and the limiting groove, to magnetically attract the first steel pipe, the second steel pipe, and the I-beam. As another embodiment, the limiting device is an L-shaped structure, with its first end hinged to the rotating frame and its second end able to extend into the gap formed by the first steel pipe, the second steel pipe, or the first flange and the web, to fix the first steel pipe, the second steel pipe, or the I-beam.

[0023] In some embodiments of this application, the manufacturing apparatus further includes a support frame having two legs and a crossbeam located between the two legs; the crossbeam is parallel to the axial direction of the first steel pipe; the welding device is movably mounted on the crossbeam. The support frame is detachable, and the height of the legs is adjustable. In steps C and D, after welding between the second flange and the first steel pipe is completed, the crossbeam located inside the rotating frame is disassembled, the height of the legs is adjusted, and then the crossbeam is installed on the outside of the rotating frame.

[0024] Compared with the prior art, the beneficial effects of this application are as follows:

[0025] The steel pipe cylindrical structure manufacturing apparatus provided in at least one embodiment of this application can achieve precise positioning of components and make all welds face upwards to form horizontal welds, effectively improving welding efficiency and significantly improving welding quality. Simultaneously, the rotating frame and limiting groove structure can be specifically designed according to the form of the steel pipe cylindrical structure, realizing the welding and manufacturing of various steel pipe cylindrical structures. The operation is simple and easy for mass production.

[0026] The method for manufacturing a steel pipe cylindrical structure provided in at least one embodiment of this application enables simple and convenient operation with respect to the provided manufacturing apparatus. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a steel pipe cylindrical structure according to one embodiment;

[0028] Figure 2 This is a top view schematic diagram of a manufacturing apparatus for one embodiment;

[0029] Figure 3 This is a front view schematic diagram of a manufacturing apparatus for one embodiment;

[0030] Figure 4 yes Figure 3 AA view;

[0031] Figure 5 yes Figure 3 BB view;

[0032] Figure 6 This is a side view schematic diagram of a manufacturing apparatus according to one embodiment;

[0033] Figure 7 This is a partial schematic diagram of a manufacturing apparatus for one embodiment;

[0034] Figure 8 This is a schematic diagram illustrating the installation of a support frame in another implementation method;

[0035] Figure 9 yes Figure 8 Enlarged view of the Q part;

[0036] Figure 10 yes Figure 8 A side view diagram;

[0037] Numbered in the figure: 1 Manufacturing device, 11 Base, 111 First groove, 12 Rotating frame, 121 Outer surface, 122 Inner surface, 1221 First boss, 1222 Limiting groove, 1223 Second boss, 13 Power gear set, 14 Gap band, 15 Magnetic suction device, 16 L-shaped structure, 17 Welding device, 18 Support frame, 181 Leg, 182 Crossbeam; 2 Steel pipe cylindrical structure, 21 First steel pipe, 22 I-beam, 221 First flange, 222 Second flange, 223 Web plate, 23 Second steel pipe. Detailed Implementation

[0038] The technical solutions of this application are described in detail below with reference to specific embodiments. However, it should be understood that, without further description, the elements, structures and features in one embodiment can also be beneficially incorporated into other embodiments.

[0039] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0040] In the description of this application, it should be understood that the terms "upper," "lower," "bottom," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 and Figure 3 The orientations or positional relationships shown are for the convenience of describing this application and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In this application, "inner" and "outer" are mainly relative to the steel pipe cylinder structure and the rotating frame, with the side closer to the center being the inner side and the side farther from the center being the outer side.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] The first embodiment of this application provides a steel pipe cylindrical structure manufacturing apparatus 1 (hereinafter referred to as the manufacturing apparatus), wherein, as Figure 1 , Figure 6 and Figure 7As shown, the steel pipe cylindrical structure 2 includes a plurality of first steel pipes 21 and an I-beam 22 connecting two adjacent first steel pipes 21. The plurality of first steel pipes 21 and the plurality of I-beams 22 are arranged in a generally circular steel pipe cylindrical structure 2. The I-beam 22 has a generally parallel outer first flange 221 and an inner second flange 222, and a web 223 that is generally perpendicular to the first flange 221 and the second flange 222. The two ends of the first flange 221 and the second flange 222 are respectively connected to the two adjacent first steel pipes 21.

[0043] like Figure 2-10 As shown, the manufacturing apparatus 1 includes a base 11 and a rotating frame 12 located on the base 11. The base 11 serves as the foundation of the entire manufacturing apparatus and has a first groove 111 with a concave surface of an arc. The rotating frame 12 is annular and located within the first groove 111. The outer surface 121 of the rotating frame 12 mates with the concave surface of the first groove 111, allowing the rotating frame 12 to be installed in and rotate relative to the first groove 111. Figure 5 As shown, the rotating frame 12 also has an inner surface 122 capable of accommodating the steel pipe cylindrical structure 2; wherein, the inner surface 122 is provided with an inwardly protruding first boss 1221 for supporting the first flange 221 of the I-beam 22; a limiting groove 1222 capable of accommodating the first steel pipe 21 is formed between two adjacent first bosses 1221; the limiting groove 1222 is a concave arc shape that matches the outer surface of the first steel pipe 21 and is used to limit the position of the first steel pipe 21.

[0044] The pedestal 11 is equipped with a drive device for driving the rotating frame 12 to rotate. In one embodiment, the drive device includes a power gear set 13 and a motor (not shown in the figure); wherein, as... Figure 5 and Figure 6 As shown, the power gear set 13 includes multiple rotatable gears that respectively contact the outer surface 121 of the rotating frame 12 to drive the rotation of the rotating frame 12; the motor is used to drive the power gear set 13 to rotate, so as to further rotate the rotating frame 12. The motor can be selected as a stepper motor to precisely control the synchronous rotation of the power gear set 13.

[0045] In one implementation, such as Figure 2 and Figure 3As shown, the manufacturing apparatus 1 includes multiple rotating frames 12 spaced apart on the pedestal 11; a gap band 14 is formed between adjacent rotating frames 12, wherein the axial length L1 of the gap band 14 is greater than the axial length L2 of the rotating frame 12, facilitating welding of the exposed first flange 221 within the gap band 14. When there are multiple rotating frames 12, the manufacturing apparatus 1 includes multiple power gear sets 13 corresponding one-to-one with the rotating frames 12, used to drive the rotation of each rotating frame 12 respectively. A synchronization control system can be provided to control the synchronous rotation of each power gear set 13, so that the rotation steps of each rotating frame 12 are consistent, thereby preventing the steel tube cylindrical structure 2 located in the rotating frame 12 from twisting. Figure 2 and Figure 3 The diagram shows a configuration where there are three rotating frames 12 and three power gear sets 13, with each set corresponding to the other. Figure 5 and Figure 6 The diagram illustrates a configuration where each power gear set 13 has five rotating gears. It is worth noting that in practical applications, the number of rotating frames 12, power gear sets 13, and gears can be flexibly adjusted based on the length and weight of the steel tubular structure 2. Furthermore, if multiple rotating frames 12 are spaced apart on the same base 11, only one axially arranged power gear set 13 can be mounted on the base 11 to simultaneously drive the multiple rotating frames 12 in synchronous motion.

[0046] The manufacturing apparatus 1 further includes a limiting device to prevent the steel pipe cylindrical structure from detaching. In one embodiment, such as... Figure 6 As shown, the limiting device is a magnetic attraction device 15 installed in the rotating frame 12. It can be either an electromagnet or a permanent magnet. It is arranged in a ring around the rotating frame 12 and close to the inner surface 122 of the rotating frame 12, especially close to the first boss 1221 and the limiting groove 1222. By magnetically attracting the first steel pipe 21 and the I-beam 22 of the steel pipe cylindrical structure, even if the first steel pipe 21 and the I-beam 22 are rotated to the top of the rotating frame 12 after the inner surfaces are welded, they will not fall off due to gravity. In another embodiment, as... Figure 8 and Figure 9 As shown, the limiting device is an L-shaped structure 16, with its first end 161 hinged to the rotating frame 12, and its second end 162 extending into the first steel pipe 21 or into the gap formed by the first flange 221 and the web 223. The second end 162 hooks the first steel pipe 21 or the I-beam 22 onto the rotating frame 12 to prevent it from falling off (e.g., ...). Figure 9 (As shown by the dashed line).

[0047] Furthermore, such as Figure 2-6As shown, the manufacturing device 1 also includes a welding device 17 for welding the steel pipe cylindrical structure, mainly including welding the first steel pipe 21 to the first flange 221 and the second flange 222 of the I-beam 22.

[0048] To achieve automated welding, the fabrication apparatus 1 further includes a support frame 18 having two legs 181 and a crossbeam 182 located between the legs 181. The crossbeam 182 is longer than the first steel pipe 21 and is substantially parallel to the axial direction of the first steel pipe 21. The welding device 17 is movably mounted on the crossbeam 182, for example, by providing a slide rail between the welding device 17 and the crossbeam 182, allowing the welding device 17 to slide continuously along the axial direction of the first steel pipe 21 to form a horizontal weld.

[0049] The support frame 18 is detachable, and its legs 181 are adjustable in height, allowing for double-sided welding of the steel pipe cylindrical structure both inside and outside the rotating frame 12. The support frame 18 can be initially installed inside the rotating frame, such as... Figure 3-6 As shown, first weld the second flange 222 and the first steel pipe 21 located below the crossbeam 182; after the inner welding is completed, disassemble the support frame 18 and set it on the outer side of the top of the rotating frame, as shown. Figure 8 and Figure 10 As shown, the first flange 221 and the first steel pipe 21 below the support frame 18 are welded together.

[0050] The manufacturing apparatus 1 also includes a pushing device (not shown in the figure) capable of axially moving the steel pipe cylindrical structure. For example, a jack that can be installed axially along the steel pipe cylindrical structure can be contacted with one end of the steel pipe cylindrical structure to axially push the steel pipe cylindrical structure to move. After the inner second flange 222 or part of the second flange 222 is welded, the first steel pipe 21 and the portion of the first flange 221 located in the gap zone 14 can be welded first. The portion blocked by the rotating frame 12 cannot be welded. Then, the steel pipe cylindrical structure can be axially pushed so that the unwelded portion is moved into the gap zone 14 for welding.

[0051] In another implementation, such as Figure 1 , Figure 6 and Figure 7As shown, the steel pipe cylindrical structure 2 also includes second steel pipes 23, which have a smaller diameter and fewer number than the first steel pipes 21, and are spaced apart on the steel pipe cylindrical structure 2 to connect two adjacent first steel pipes 21, replacing the I-beams 22 thereon. The steel pipe cylindrical structure 2 simultaneously has I-beams 22 and second steel pipes 23; the centers of the first steel pipes, the second steel pipes, and the I-beams (webs) are located on the same circumference of the steel pipe cylindrical structure 2. The second steel pipe 23 has an extension 231 longer than the first steel pipes 21 and the I-beams 22. Based on this, the inner surface 122 of the manufacturing device 1 is also provided with an inwardly protruding second boss 1223 for supporting the second steel pipe 23, which has an arc-shaped second groove matching the outer surface of the second steel pipe 23. The limiting groove 1222 is formed between the second boss 1223 and the adjacent first boss 1221.

[0052] The second embodiment of this application provides a method for manufacturing a steel pipe cylindrical structure, which can employ the manufacturing apparatus described in any of the preceding embodiments, and includes the following steps:

[0053] Step A: As Figure 7 As shown, the first steel pipe 21 before welding is arranged in the limiting groove 1222 at the lower part of the rotating frame 12; the I-beam 22 before welding is arranged on the first boss 1221 at the lower part of the rotating frame 12, so that the outermost first flange 221 contacts the first boss 1221; at this time, the two ends of the first flange 221 and the second flange 222 of the I-beam are respectively close to the two adjacent first steel pipes.

[0054] Step B: Arrange the welding device 17 inside the rotating frame 12 to weld the second flange 222 and the first steel pipe 21 on the inner side. Install a restraining device, such as turning on the electromagnet switch or moving the second end of each L-shaped structure 16 to extend into the first steel pipe 21 and into the gap formed by the first flange 221 and the web 223, to prevent the steel pipe cylindrical structure from detaching.

[0055] Step C: Rotate the rotating frame 12, continue to arrange the first steel pipe 21 and the I-beam 22, repeat steps A and B, and complete the welding between the second flange 222 and the first steel pipe 21.

[0056] Step D: Move the welding device 17 to the outside of the rotating frame 12, rotate the rotating frame 12, and weld all the first flanges 221 and the first steel pipes 21 together.

[0057] Further, in step D, the first flange 221 and the first steel pipe 21 located in the gap zone 14 are first welded, and then the unwelded first flange 221 and the first steel pipe 21 are moved into the gap zone 14 by a pushing device to complete the welding of the first flange 221 and the first steel pipe 21.

[0058] In one embodiment, when the steel pipe cylindrical structure 2 includes a second steel pipe 23, step A further includes placing the second steel pipe 23 before welding on the second boss 1223 at the lower part of the rotating frame 12, at which time the second steel pipe 23 is close to two adjacent first steel pipes respectively; step B further includes welding the first steel pipe 21 and the second steel pipe 23 together; step C further includes continuing to place the second steel pipe 22, repeating steps A and B, and completing the welding between the first steel pipe 21 and the second steel pipe 23; step D further includes supplementary welding between the first steel pipe 21 and the second steel pipe 23 from the outside of the rotating frame 12.

[0059] The order of steps described in this embodiment is merely a descriptive order. In actual operation, it can be adjusted according to actual needs. Therefore, this descriptive order does not constitute an absolute limitation on this application.

[0060] The described embodiments are merely preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. A method for manufacturing a steel pipe cylindrical structure, characterized in that, The steel pipe cylindrical structure is manufactured using a fabrication device. The steel pipe cylindrical structure includes multiple first steel pipes and an H-beam connecting two adjacent first steel pipes. The H-beam has a first flange on an outer side and a second flange on an inner side, which are parallel to each other, and a web connecting the first flange and the second flange. The two ends of the first flange and the second flange are respectively connected to the two adjacent first steel pipes. The fabrication device includes: a platform having a first groove with a concave surface in the shape of an arc; and a rotating frame, which is annular and has an outer surface that matches the first groove of the platform, such that the rotating frame... The rotating frame is rotatable within a first groove and has an inner surface capable of accommodating the steel pipe cylindrical structure. The inner surface of the rotating frame is provided with an inwardly protruding first boss for supporting the first flange of the I-beam, and a limiting groove for accommodating the first steel pipe is formed between two adjacent first bosses. A driving device, mounted on a base, is used to drive the rotating frame to rotate. A welding device, with adjustable height, is used to weld the second flange to the first steel pipe on the inner side of the rotating frame and to the first flange to the first steel pipe on the outer side of the rotating frame. The manufacturing method includes the following steps: Step A: Place the first steel pipe to be welded in the limiting groove at the bottom of the rotating frame; place the I-beam to be welded on the first boss at the bottom of the rotating frame, so that the outermost first flange contacts the first boss; at this time, the two ends of the first and second flanges of the I-beam are respectively close to the two adjacent first steel pipes. Step B: Arrange the welding device inside the rotating frame and weld the second flange and the first steel pipe on the inner side. Step C: Rotate the rotating frame to continue arranging the first steel pipe and I-beam. Repeat steps A and B to complete the welding between the second flange and the first steel pipe. Step D: Move the welding device to the outside of the rotating frame, rotate the rotating frame, and weld all the first flanges and the first steel pipes together.

2. The method for manufacturing a steel pipe cylindrical structure according to claim 1, characterized in that, The steel pipe cylindrical structure also includes second steel pipes with a smaller diameter and fewer number than the first steel pipes, which are spaced apart on the steel pipe cylindrical structure to connect two adjacent first steel pipes, replacing the I-beams at that location; the steel pipe cylindrical structure simultaneously has I-beams and second steel pipes; the inner surface of the rotating frame is also provided with an inwardly protruding second boss for supporting the second steel pipes, the second boss having an arc-shaped second groove matching the outer surface of the second steel pipes; the limiting groove is formed between the second boss and the adjacent first boss; step A further includes arranging the second steel pipes to be welded on the second boss at the lower part of the rotating frame, at which time the second steel pipes are close to two adjacent first steel pipes respectively; step B further includes welding the first steel pipes and the second steel pipes together; step C further includes continuing to arrange the second steel pipes, repeating steps A and B, to complete the welding between the first steel pipes and the second steel pipes; step D further includes supplementary welding from the outside of the rotating frame between the first steel pipes and the second steel pipes.

3. The method for manufacturing a steel pipe cylindrical structure according to claim 1 or 2, characterized in that, The manufacturing apparatus includes multiple rotating frames spaced apart and a pushing device capable of axially moving the steel pipe cylindrical structure. A gap zone is formed between adjacent rotating frames, and the welding of the first flange and the first steel pipe is carried out in the gap zone. In step D, the first flange and the first steel pipe located in the gap zone are first welded, and then the unwelded first flange and the first steel pipe are moved to the gap zone for welding using the pushing device.

4. The method for manufacturing a steel pipe cylindrical structure according to claim 2, characterized in that, In step B, a limiting device is arranged to prevent the steel pipe cylindrical structure from falling off.

5. The method for manufacturing the steel pipe cylindrical structure according to claim 4, characterized in that, The limiting device is a magnetic attraction device installed in the rotating frame near the first boss, the second boss and the limiting groove, to magnetically attract the first steel pipe, the second steel pipe and the I-beam.

6. The method for manufacturing the steel pipe cylindrical structure according to claim 4, characterized in that, The limiting device has an L-shaped structure, with its first end hinged to the rotating frame and its second end able to extend into the gap formed by the first steel pipe, the second steel pipe, or the first flange and the web to fix the first steel pipe, the second steel pipe, or the I-beam.

7. The method for manufacturing a steel pipe cylindrical structure according to claim 1 or 2, characterized in that, The manufacturing apparatus further includes a support frame having two legs and a crossbeam located between the two legs; the crossbeam is parallel to the axis of the first steel pipe; the welding device is movably mounted on the crossbeam; the support frame is detachable, and the height of the legs is adjustable; in steps C and D, after the welding between the second flange and the first steel pipe is completed, the crossbeam located inside the rotating frame is disassembled, the height of the legs is adjusted, and then the crossbeam is installed on the outside of the rotating frame.

8. The method for manufacturing a steel pipe cylindrical structure according to claim 1 or 2, characterized in that, The driving device includes a power gear set and a motor for driving the power gear set to rotate; wherein, the power gear set includes a plurality of rotatable gears, which respectively contact the outer surface of the rotating frame to drive the rotating frame to rotate.

9. The method for manufacturing a steel pipe cylindrical structure according to claim 3, characterized in that, In step B, a limiting device is arranged to prevent the steel pipe cylindrical structure from falling off.

10. The method for manufacturing a steel pipe cylindrical structure according to claim 9, characterized in that, The limiting device is a magnetic attraction device installed in the rotating frame near the first boss and the limiting groove, so as to magnetically attract the first steel pipe and the I-beam.

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