Method for machining a large-diameter thick-walled complex cylindrical tube

Abstract

The present application relates to a kind of processing methods of large-diameter thick-walled complex pipe column, belong to steel structure technical field, including the following operating steps: first step: the conical pipe section I, conical pipe section II and pipe section are lofted, blanking, forming, and complete the column hole processing of pipe section.Second step: end face circle four equal division point mark is made respectively in the conical pipe section I, conical pipe section II and pipe section both end face and is marked with sample punch.Third step: the position contour of identification roller stand is marked.Fourth step: set up the wheel and wheel base of steel pipe splicing with mould, then conical pipe section I, conical pipe section II and pipe section are hoisted to several mould wheels.Fifth step: conical pipe section I, conical pipe section II and pipe section are ring seam welded and formed.Sixth step: complete H-shaped steel hoof welding on conical pipe section II.Seventh step: the lower insertion plate is inserted into pipe section to complete welding, complete the splicing welding of lower insertion plate and column bottom plate.It has the characteristics of convenient operation, shortens production cycle, good quality stability and good stress effect.

Description

Technical Field

[0001] This invention relates to the field of steel structure technology, specifically to a method for processing large-diameter, thick-walled, complex circular tubular columns. Background Technology

[0002] Tapered tube straight columns play a vital role in modern airport construction, forming an important component of the airport terminal's steel structure. Their unique shape and superior performance ensure both the safety and aesthetics of the terminal. Tapered tube straight columns have the following characteristics: Aesthetically pleasing: The tapered design gives the building a more modern and beautiful appearance.

[0003] Reasonable stress distribution: The conical structure helps to optimize the stress distribution and improve overall stability.

[0004] Low cost: Compared with traditional structures, tapered tube straight column structures have a more cost-effective advantage.

[0005] Low self-weight: While ensuring strength, the self-weight of the structure is reduced.

[0006] A large-diameter, thick-walled, complex circular tube column is made of low-alloy high-strength structural steel of Q460GJC-Z5, Q460GJC, and Q355B. The entire steel column is formed by sequentially connecting two sections of tapered tube and one section of circular tube. The tube diameter and wall thickness specifications are D1500~1000×60×50×40×30.

[0007] Circular tubular columns are characterized by their large size, high steel strength, thick steel plates, high weld quality requirements, large welding workload, numerous brackets, and high assembly difficulty, making their overall processing quite challenging. The internal components of large-diameter, thick-walled, complex circular tubular columns, such as partitions and studs, require phased assembly and disassembly. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a method for processing large-diameter, thick-walled, complex circular tubular columns. This method is characterized by convenient operation, shortened production cycle, good quality stability, and effective stress distribution. It also reduces the number of times components need to be moved or turned, thereby minimizing welding deformation and residual stress.

[0009] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: A method for processing a large-diameter, thick-walled, complex circular tube column, comprising a circular tube section with several column holes, a tapered tube section I at one end of the circular tube section, a tapered tube section II between the tapered tube section I and the circular tube section, several H-shaped steel brackets arranged in a ring on the outer circumference of the tapered tube section II, a column base plate at the other end of the circular tube section, and a cross-shaped lower insert plate between the column base plate and the circular tube section, and uniformly distributed welded studs inside the tapered tube section I, tapered tube section II, and the circular tube section.

[0010] The processing method includes the following steps: Step 1: Lay out, cut, and shape the tapered pipe section I, tapered pipe section II, and circular pipe section. After shaping, assemble and weld the partitions, longitudinal ribs, and studs inside the tapered pipe section I, tapered pipe section II, and circular pipe section. Then, complete the machining of the column holes in the circular pipe section.

[0011] Step 2: Mark the four equal division points of the end face at 0°, 90°, 180° and 270° on both ends of the tapered pipe section I, tapered pipe section II and circular pipe section respectively. Then use ink lines to pop out the corresponding equal division points as the splicing reference generatrix, that is, the splicing and mating line of the pipe body is the parallel line of the central axis of the steel pipe, and punch a center punch.

[0012] Step 3: Draw the center line and outline projection line of the steel pipes to be spliced ​​on the platform; according to the length of each steel pipe segment, draw a perpendicular line to the center projection line on the horizontal platform to mark the position outline of the roller frame.

[0013] Step 4: Based on the position of the vertical line and the center projection line, set up the jig wheels and jig base for splicing steel pipes. Then, hoist the tapered pipe section I, tapered pipe section II and circular pipe section onto several jig wheels, and adjust the height of the jig wheels. Align them sequentially with the splicing reference line as the reference and fix the adjacent pipe sections with tack welding.

[0014] Step 5: Conical pipe section I, conical pipe section II, and circular pipe section are circumferentially welded together.

[0015] Weld the inner side first, clean the root of the outer side, and then weld the outer side. After the circular seam is welded, grind the weld in time, clean the weld slag and surface spatter, and perform non-destructive testing on the weld quality of the circular seam.

[0016] Step 6: Weld the H-beam brackets together, then mark the positions on tapered pipe section II, and finally weld the H-beam brackets onto tapered pipe section II.

[0017] Step 7: Next, insert the lower insert plate into the round pipe section to complete the welding, and finally complete the welding of the lower insert plate and the column base plate.

[0018] Preferably, the tapered tube section II is provided with several longitudinal reinforcing ribs arranged in a ring. The longitudinal reinforcing ribs and studs are first welded to the inner wall of the middle section of the tapered tube section II in sequence, and then several inner partitions and the remaining studs are welded to both ends of the longitudinal reinforcing ribs.

[0019] As a preferred option, the steel plates for tapered tube sections I and II are cut using CNC laser cutting technology according to design requirements. Then, when pressing with a hydraulic press, a machining allowance is added. The joint between the two tapered tube halves is then beveled on both sides. For the circular tube section, the steel plate is cut using a CNC cutting machine, with a machining allowance reserved. The ends are pre-bent using a hydraulic press or plate rolling machine to prevent straight edges during rolling. The steel plate is then hoisted into a three-roll plate rolling machine, where a progressive rolling process is used to ensure the accuracy of the circular tube forming. After vertically splicing tapered tube sections I, II, and the circular tube section, longitudinal seam welding is performed.

[0020] As a preferred method, the inner side is welded first and then the outer side during longitudinal seam welding. Carbon arc gouging is used for root cleaning, and carbon dioxide gas shielded welding is used for the pre-welding of the longitudinal seam for the root pass. Multi-wire submerged arc welding is used for welding the inner and outer longitudinal seams.

[0021] As a preferred method, during the assembly of the H-beam brackets, the assembly position lines of each bracket's web and the center line of the bracket are marked using the reference generatrix of the steel pipe extension splicing of tapered pipe section II and the end milling surface as references. The connecting brackets are then placed on the steel pipe column assembly surface, aligning the bracket center line and the flange contour with the bracket positioning contour line. During assembly, it should be ensured that the center plane of the bracket web thickness passes through the central axis of tapered pipe section II.

[0022] Preferably, both ends of the H-beam bracket are provided with several bracket reinforcing ribs that are welded and fixed to the H-beam bracket. Several bracket studs are arranged in an array on both sides of the bracket reinforcing ribs and welded perpendicular to the H-beam bracket. The bracket studs are fixed by stud welding or carbon dioxide gas shielded welding.

[0023] Preferably, the outer circumference of the rear end of the tapered tube section I is provided with several connecting plates that are distributed in an equal-spaced ring. The welding position is located by the center line, and then the connecting plates are aligned with the positioning line and welded and fixed.

[0024] As a preferred method, when machining cylindrical holes, first determine the position and size of the hole on the circular tube section. Then, when using flame cutting to perform the hole-making operation, the cutting speed and flame temperature should be well controlled, and the operation procedure should be strictly followed to ensure the accuracy and safety of the hole-making. After the hole-making is completed, clean the edge of the hole, removing burrs and slag impurities to ensure that the edge of the hole is smooth and flat.

[0025] The present invention can achieve the following effects: This invention provides a method for processing large-diameter, thick-walled, complex circular tubular columns. Compared with existing technologies, it features convenient operation, shortened production cycle, good quality stability, and better stress distribution. It reduces the number of times components need to be moved and rotated, thus minimizing welding deformation and residual stress. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the tapered tube section II of the present invention.

[0028] Figure 3 This is a schematic diagram of the circular tube segment of the present invention.

[0029] Figure 4 This is a schematic diagram of the welding structure of the tapered tube section and the circular tube section of the present invention.

[0030] Figure 5 This is a schematic diagram of the welding structure of the H-shaped steel bracket of the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of the lower insert plate and column base plate of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure after the final remaining welding of the present invention.

[0033] In the figure: tapered pipe section I 1, tapered pipe section II 2, H-beam bracket 3, round pipe section 4, lower insert plate 5, column base plate 6, bracket reinforcing rib 7, bracket stud 8, connecting plate 9, longitudinal reinforcing rib 10, inner partition 11, column hole 12, jig wheel 13, jig base 14. Detailed Implementation

[0034] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0035] Example: Figure 1-7 As shown, a method for processing a large-diameter, thick-walled, complex circular tube column is disclosed. The large-diameter, thick-walled, complex circular tube column includes a circular tube section 4, which has several column holes 12. One end of the circular tube section 4 has a tapered tube section I1, and a tapered tube section II2 is provided between the tapered tube section I1 and the circular tube section 4. Several H-shaped steel brackets 3 arranged in a ring are provided on the outer circle of the tapered tube section II2. The other end of the circular tube section 4 has a column base plate 6, and a pair of cross-shaped lower insert plates 5 are provided between the column base plate 6 and the circular tube section 4. Welded studs are uniformly distributed inside the tapered tube section I1, the tapered tube section II2, and the circular tube section 4.

[0036] The processing method includes the following steps: Step 1: Lay out, cut, and shape the tapered pipe section I1, tapered pipe section II2, and circular pipe section 4. After shaping, assemble and weld the partitions, longitudinal ribs, and studs inside the tapered pipe section I1, tapered pipe section II2, and circular pipe section 4. Tapered pipe section II2 has several annularly distributed longitudinal reinforcing ribs 10. First, weld the longitudinal reinforcing ribs 10 and studs sequentially to the inner wall of the middle section of tapered pipe section II2. Then, weld four inner partitions 11 and the remaining studs to both ends of the longitudinal reinforcing ribs 10. Next, complete the machining of the cylindrical holes 12 in the circular pipe section 4. When machining the cylindrical holes 12, first determine the opening position and size on the circular pipe section 4. Then, when using flame cutting for the opening operation, the cutting speed and flame temperature should be carefully controlled, and the operating procedures should be strictly followed to ensure the accuracy and safety of the opening. After the opening is completed, clean the opening edges, removing burrs and slag impurities to ensure a smooth and flat opening edge.

[0037] According to design requirements, tapered tube sections I1 and II2 are cut from steel plates using CNC laser cutting technology. Then, during hydraulic pressing, a machining allowance is added. The joint between the two tapered tube halves is then beveled on both sides. Round tube section 4 is cut from steel plates using a CNC cutting machine, with a machining allowance reserved. The ends are pre-bent using a hydraulic press or plate rolling machine to prevent straight edges during rolling. The steel plates are then hoisted into a three-roll plate rolling machine, where a progressive rolling process is used to ensure the accuracy of the round tube forming. After vertically splicing tapered tube sections I1, II2, and 4, longitudinal seam welding is performed. During longitudinal seam welding, the inner side is welded first, followed by the outer side. Carbon arc gouging is used for root cleaning. Carbon dioxide gas shielded welding is used for the longitudinal seam pre-welding. Multi-wire submerged arc welding is used for both the inner and outer longitudinal seams.

[0038] Step 2: Mark the four equal division points of the end face at 0°, 90°, 180° and 270° on both ends of tapered pipe section I1, tapered pipe section II2 and circular pipe section 4 respectively. Then use ink lines to pop out the corresponding equal division points as the splicing reference generatrix, that is, the splicing and mating line of the pipe body is the parallel line of the central axis of the steel pipe, and punch a center punch.

[0039] Step 3: Draw the center line and outline projection line of the steel pipes to be spliced ​​on the platform; according to the length of each steel pipe segment, draw a perpendicular line to the center projection line on the horizontal platform to mark the position outline of the roller frame.

[0040] Step 4: Based on the position of the vertical line and the center projection line, set up the steel pipe splicing jig wheel 13 and jig base 14. Then, the tapered pipe section I1, tapered pipe section II2 and circular pipe section 4 are hoisted onto several jig wheels 13, and the height of the jig wheels 13 is adjusted. The adjacent pipe sections are aligned in sequence with the splicing reference line as the reference and fixed with tack welding.

[0041] Step 5: Conical pipe section I1, conical pipe section II2, and circular pipe section 4 are circumferentially welded together.

[0042] Weld the inner side first, clean the root of the outer side, and then weld the outer side. After the circular seam is welded, grind the weld in time, clean the weld slag and surface spatter, and perform non-destructive testing on the weld quality of the circular seam.

[0043] Step 6: Weld the H-beam bracket 3 into shape, then mark the positioning on the tapered pipe section II2, and complete the welding of the H-beam bracket 3 onto the tapered pipe section II2.

[0044] Both ends of the H-beam bracket 3 are provided with several bracket reinforcing ribs 7 that are welded and fixed to the H-beam bracket 3. Several bracket studs 8 are arranged in an array on both sides of the bracket reinforcing ribs 7 and welded perpendicularly to the H-beam bracket 3. The bracket studs 8 are fixed by stud welding or carbon dioxide gas shielded welding.

[0045] When assembling the H-beam bracket 3, use the reference generatrix of the steel pipe extension splicing of tapered pipe section II2 and the end milling surface as references to mark the assembly position lines of each bracket's web and the bracket's center line; place the connecting bracket on the steel pipe column assembly surface, aligning the bracket's center line and the web's outline with the bracket's positioning outline. During assembly, ensure that the center plane of the bracket's web thickness passes through the central axis of tapered pipe section II2.

[0046] Step 7: Next, insert the lower insert plate 5 into the round pipe section 4 to complete the welding, and finally complete the splicing welding of the lower insert plate 5 and the column base plate 6.

[0047] The outer circle of the rear end of the tapered tube section I1 is provided with several connecting plates 9 arranged in an equal-spaced ring. The welding position is located by the center line, and then the connecting plates 9 are aligned with the positioning line and welded and fixed.

[0048] In summary, this processing method for large-diameter, thick-walled, complex circular tubular columns is characterized by convenient operation, shortened production cycle, good quality stability, and good stress distribution. It reduces the number of times components need to be moved around, thus minimizing welding deformation and residual stress.

[0049] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A method for processing large-diameter, thick-walled, complex circular tube columns, characterized in that: The large-diameter thick-walled complex circular tube column includes a circular tube section (4), which has several column holes (12). One end of the circular tube section (4) is provided with a tapered tube section I (1), and a tapered tube section II (2) is provided between the tapered tube section I (1) and the circular tube section (4). Several H-shaped steel brackets (3) are provided on the outer circle of the tapered tube section II (2) in a ring. The other end of the circular tube section (4) is provided with a column base plate (6), and a lower insert plate (5) is provided between the column base plate (6) and the circular tube section (4). The tapered tube section I (1), tapered tube section II (2) and the circular tube section (4) are provided with uniformly distributed welded studs. The processing method includes the following steps: Step 1: Lay out, cut, and form the tapered pipe section I (1), tapered pipe section II (2), and round pipe section (4). After forming, assemble and weld the partitions, longitudinal ribs, and studs in the tapered pipe section I (1), tapered pipe section II (2), and round pipe section (4). Then, process the column hole (12) of the round pipe section (4). Step 2: Mark the four equal division points of the end face at 0°, 90°, 180° and 270° respectively on the two end faces of the tapered pipe section I (1), tapered pipe section II (2) and circular pipe section (4), and then use ink lines to pop up the corresponding equal division points as the splicing reference generatrix, that is, the splicing and mating line of the pipe body is the parallel line of the central axis of the steel pipe, and punch the sample punch; Step 3: Draw the center line and outline projection line of the steel pipes to be spliced ​​on the platform; according to the length of each steel pipe segment, draw a perpendicular line to the center projection line on the horizontal platform to mark the position outline of the roller frame; Step 4: Based on the position of the vertical line and the center projection line, set up the steel pipe splicing jig wheel (13) and jig base (14), then hoist the tapered pipe section I (1), tapered pipe section II (2) and circular pipe section (4) onto several jig wheels (13), and adjust the height of the jig wheels (13), align them in sequence with the splicing reference line as the reference, and fix the adjacent pipe sections with positioning welds; Step 5: Conical pipe section I (1), conical pipe section II (2), and circular pipe section (4) are circumferentially welded together; Weld the inner side first, clean the root of the outer side, and then weld the outer side; after the circular seam is welded, the weld should be ground in time to clean the weld slag and surface spatter, and the weld quality of the circular seam should be non-destructive tested. Step 6: Weld the H-beam bracket (3) together, then mark the positioning on the tapered pipe section II (2), and weld the H-beam bracket (3) onto the tapered pipe section II (2); Step 7: Next, insert the lower insert plate (5) into the round pipe section (4) to complete the welding, and finally complete the welding of the lower insert plate (5) and the column base plate (6).

2. The processing method for large-diameter, thick-walled, complex circular tube columns according to claim 1, characterized in that: The tapered tube section II (2) is provided with several longitudinal reinforcing ribs (10) arranged in a ring. First, the longitudinal reinforcing ribs (10) and studs are welded to the inner wall of the middle section of the tapered tube section II (2) in sequence. Then, several inner partitions (11) and the remaining studs are welded to both ends of the longitudinal reinforcing ribs (10).

3. The processing method for large-diameter, thick-walled, complex circular tube columns according to claim 1, characterized in that: According to the design requirements, the steel plates of the tapered tube section I (1) and tapered tube section II (2) are cut using CNC laser cutting technology. Then, when the hydraulic press is used for pressing, a processing allowance needs to be added. Then, the joint of the two halves of the tapered tube is beveled on both sides. The steel plate of the round tube section (4) is cut using a CNC cutting machine, with a processing allowance reserved. The ends are pre-bent using a hydraulic press or a plate rolling machine to pre-bend both ends of the steel plate to prevent straight edges from appearing during rolling. Then, the steel plate is hoisted into a three-roll plate rolling machine and the cylinder is rolled in a progressive manner to ensure the forming accuracy of the round tube. After the tapered tube section I (1), tapered tube section II (2) and round tube section (4) are vertically spliced ​​and joined together, longitudinal seam welding is performed.

4. The method for processing large-diameter, thick-walled, complex circular tube columns according to claim 3, characterized in that: When welding the longitudinal seam, weld the inner side first, then the outer side. Use carbon arc gouging to clean the root. Use carbon dioxide gas shielded welding for the root pass of the longitudinal seam pre-welding. Use multi-wire submerged arc welding for welding the inner and outer longitudinal seams.

5. The method for processing large-diameter, thick-walled, complex circular tube columns according to claim 1, characterized in that: When assembling the H-beam bracket (3), the assembly position lines of each bracket flange and the center line of the bracket are drawn based on the reference line of the steel pipe splicing of the tapered pipe section II (2) and the end milling surface; the connecting bracket is placed on the steel pipe column assembly surface so that the center line of the bracket and the flange outline are aligned with the bracket positioning outline. During assembly, it should be ensured that the center plane of the thickness of the cow leg web plate passes through the center axis of the tapered tube section II (2).

6. The method for processing large-diameter, thick-walled, complex circular tube columns according to claim 1 or 5, characterized in that: Both ends of the H-shaped steel bracket (3) are provided with several bracket reinforcing ribs (7) that are welded and fixed to the H-shaped steel bracket (3). Several bracket studs (8) are arranged in an array and welded perpendicular to the H-shaped steel bracket (3) on both sides of the bracket reinforcing ribs (7). The bracket studs (8) are fixed by stud welding or carbon dioxide gas shielded welding.

7. The method for processing large-diameter, thick-walled, complex circular tube columns according to claim 1, characterized in that: The outer circle of the rear end of the tapered tube section I (1) is provided with several connecting plates (9) arranged in an equally spaced ring. The welding position is positioned by the center line, and then the connecting plates (9) are aligned with the positioning line and welded and fixed.

8. The method for processing large-diameter, thick-walled, complex circular tube columns according to claim 1, characterized in that: When machining the column hole (12), first determine the opening position and size on the round tube section (4), and then use flame cutting to perform the opening operation. The cutting speed and flame temperature should be controlled, and the operation procedure should be strictly followed to ensure the accuracy and safety of the opening. After drilling is completed, clean the edges of the drilled hole. Burrs and slag impurities should be removed from the edges of the drilled hole to ensure that the edges of the drilled hole are smooth and flat.

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