A bending method for manufacturing large-diameter, thick-walled, high-strength steel pipes

Abstract

A method for bending and manufacturing large-diameter, thick-walled, high-strength steel pipes includes: simulating the bending direction centerline of each semicircle using a BIM model of the steel arch shape; marking the joint lines and processing lines of the steel pipe with chalk and stamping them on the pipe with a steel stamp; applying pressure using a press and comparing the theoretical and measured arch heights of various parts of the steel pipe; re-verifying the joint lines, processing lines, and their corresponding centerlines; marking the cutting sequence on the steel pipe and cutting the pipe according to the specified sequence, leaving approximately 10mm of uncut area in the connection zone of the relevant cuts; cutting the subsequent eight connection points after the component has cooled; and cutting the pipe at both ends to divide it into two semicircular sections. This invention solves the difficulty of processing adjacent stages of large-diameter curved steel pipes in different planes.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of steel structure buildings, and particularly relates to a bending manufacturing method of a large-diameter thick-wall high-strength steel pipe. BACKGROUND

[0002] The steel pipe is a commonly used component in the steel structure building, and in the construction process, the steel pipe is processed into a semicircular pipe for better convenience of construction, and the semicircular pipe arch axis adopts a quadratic parabola, the arch rib is not only vertically bent, but also horizontally bent along the road curve, and the overall presents a three-dimensional spatial form of tilting towards the outside of the curve, and the processing radii of adjacent stages of the steel pipe are not in the same plane, so that the processing difficulty is large.

[0003] In the cutting process of the pipe fitting, if the pipe fitting is directly cut in place at one time, deformation is prone to occur, and the pipe fitting is prone to rolling in the cutting process, so that the cutting seam of the steel pipe is not in a horizontal state, the cutting precision is affected, meanwhile, in the cutting process of the connecting point, the steel pipe is prone to collapse and hurt people, so that safety hazards exist in the processing process. SUMMARY

[0004] The application aims at overcoming the above problems, and provides a bending manufacturing method of a large-diameter thick-wall high-strength steel pipe, the bending direction center lines of respective semicircles are simulated through a BIM model, the whole is coiled and cut according to the circular arc pipe processing, and the two circular arc semicircular pipes are obtained by opening, so that the processing precision can be effectively ensured, and deformation of the semicircular pipe in the processing process can be avoided.

[0005] Technical scheme: in order to achieve the above purpose, the application provides a bending manufacturing method of a large-diameter thick-wall high-strength steel pipe, which comprises the following steps:

[0006] S1: the bending direction center lines of respective semicircles are simulated through a BIM model according to the steel arch line type;

[0007] S2: the powder line is popped out at the steel pipe joint position line and the processing position line according to the drawing size, and is marked on the steel pipe by stamping, and the inner and outer sides are marked, 30mm excess is reserved at both ends of the steel pipe, and quality inspection is required for checking and rechecking, which serves as the basis for subsequent steel pipe pressing and cutting;

[0008] S3: 6-meter long false joints are added at both ends of the steel pipe, and pressing is performed through a 2000-ton oil press, and the lower area of the steel pipe in the pressing area is heated and baked by an oven gun until the 7-meter long range of the steel pipe is pressed;

[0009] S4: after the final pressing is completed, the theoretical arch height and the measured arch height of each part of the steel pipe are compared;

[0010] S5: after pressing, according to the size of the drawing, recheck the joint position line, processing position line and the center line corresponding to the processing position line, and hand over to the quality inspection, ensure the accuracy before carrying out the joint cutting processing;

[0011] S6: draw out the cutting sequence on the steel pipe, and set up the cutting platform in the workshop, and cut the joint according to the specified cutting sequence, and leave about 10mm area in the connection area of the relevant joint during the cutting process;

[0012] S7: first, the joint of the steel pipe is placed in a horizontal state, then the upper port of the both ends of the steel pipe is hung by the hook through the small crane, and the support is arranged at the joint connection point position, and after the component is cooled, the cutting of the subsequent 8 connection points is carried out;

[0013] S8: then, the joint at the port position of the both ends of the steel pipe is cut, and the steel pipe is cut into two half circular pipes;

[0014] S9: longitudinal groove is set on the half circular pipe, and the groove setting form is: 11° root is left inside, and 6mm root is left outside;

[0015] S10: after the longitudinal groove is set, the half circular pipe is placed on the horizontal jig for positioning, and the fire correction is carried out;

[0016] S11: the measured value and the theoretical value data of the overall test piece are collected as the reference corresponding to the subsequent production of the half circular pipe.

[0017] The bending manufacturing method of the large pipe diameter thick wall high strength steel pipe provided by the application, before cutting in step S6, the processing direction of the half circle is not at the center line position of the half circle, and the adjacent stage processing radius is not in the same plane; therefore, the two side half circular pipes are combined into a whole circular pipe according to a certain rule, the whole circular pipe is rolled, and then the circular arc pipe is processed, and then the two circular arc half circular pipes are obtained.

[0018] The bending manufacturing method of the large pipe diameter thick wall high strength steel pipe provided by the application, before correction in step 10, the actual and theoretical data deviation value is measured and recorded, and the fire correction is carried out after the quality inspection.

[0019] The half circular pipe manufactured by the bending manufacturing method of the large pipe diameter thick wall high strength steel pipe provided by the application, the inner wall of the half circular pipe is provided with a group of first auxiliary plates and first partition plates.

[0020] The super-large section double-web waist circular joint provided by the application comprises a half circular pipe manufactured by the bending manufacturing method of the large pipe diameter thick wall high strength steel pipe.

[0021] The application further comprises a box body, the box body is provided with an anchor rod assembly; the half circular pipes are oppositely arranged on the two sides of the box body, and the length of the half circular pipe is longer than the length of the box body;

[0022] A set of port upper panels and port lower panels are oppositely arranged between the semicircular pipes and at one end of the box body.

[0023] Further comprising corbels arranged outside the semicircular pipes.

[0024] The anchor rod assembly comprises a support frame and an anchor rod, the support frame is provided with a meander-shaped opening, and the anchor rod extends from the lower end face of the meander-shaped opening to the lower side of the support frame.

[0025] The box body comprises an upper top plate and a lower bottom plate, the support frame is arranged between the upper top plate and the lower bottom plate, and the webs are arranged on both sides of the support frame and are welded and fixed to the upper top plate and the lower bottom plate at the upper and lower ends thereof.

[0026] A set of vertical partitions are arranged on both sides of the anchor rod assembly in the box body, the vertical partitions are oppositely arranged with the first partitions in the semicircular pipes, and segmented webs are arranged between the vertical partitions and the first partitions; the vertical partitions are provided with open grooves, and the second partitions are arranged in the open grooves.

[0027] The first partition is in a semicircular or semicircular ring shape, and a set of openings are arranged on the outer side of the first partition, one side of the second partition is fixed to the semicircular pipe, and the other side is inserted into the opening of the first partition.

[0028] The above technical solution can have the following beneficial effects:

[0029] 1. The bending manufacturing method of the large-diameter thick-walled high-strength steel pipe can effectively ensure the machining precision, can solve the difficulty that adjacent stages of the large-diameter arc-shaped steel pipe are not in the same plane, can also avoid deformation of the semicircular pipe during the machining process, records actual data and theoretical data in the model during the whole process, and can provide a strong reference for subsequent machining.

[0030] 2. In the slitting process, a connection point of about 10mm is left in the relevant slitting area, and the subsequent cutting of the connection point is performed after the component is cooled, which can effectively prevent the steel pipe from deforming during the cutting process.

[0031] 3. When cutting the connection point, first place the slits of the steel pipe in a horizontal state, then use a small crane to hang the upper opening of the steel pipe at both ends with hooks, so as to prevent the steel pipe from suddenly breaking open and injuring people during the process of cutting the connection point, and effectively improve the safety of the machining.

[0032] 4. Supports are also installed during the processing to further control the deformation of the semi-circular tube. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the measured inner diameter of the steel pipe end of the present invention;

[0034] Figure 2 This is a schematic diagram illustrating that during the cutting process of this invention, an area of ​​about 10mm is left uncut in the connection area of ​​the relevant kerf.

[0035] Figure 3 This is a schematic diagram of the support setup in this invention;

[0036] Figure 4 This is a schematic diagram of the internal structure of the ultra-large cross-section double web waist-shaped node in this invention;

[0037] Figure 5 This is a schematic diagram of the anchor bolt assembly in this invention;

[0038] Figure 6 This is a schematic diagram showing the installation of the anchor bolt assembly with the upper top plate and the lower bottom plate in this invention;

[0039] Figure 7 This is a schematic diagram of the ultra-large cross-section double web waist-shaped node in this invention;

[0040] Figure 8 This is a schematic diagram of the internal structure of a bracket and a semi-circular tube assembly in this invention;

[0041] Figure 9 This is a schematic diagram of a bracket and semi-circular tube installation structure in this invention;

[0042] Figure 10 This is a schematic diagram of another bracket and semi-circular tube installation structure in this invention;

[0043] Figure 11 This is a schematic diagram of the installation of the stiffener plate and the node plate in this invention. Detailed Implementation

[0044] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] The figure shows a method for bending and manufacturing large-diameter, thick-walled, high-strength steel pipes, including:

[0047] S1: Simulate the center line of the bending direction of each semicircle of the steel arch line using a BIM model;

[0048] S2: According to the drawing size, the powder line is popped out at the steel pipe joint position line and the processing position line, and the steel stamp is knocked on the steel pipe, and the inner and outer sides are marked, and 30mm excess is left at both ends of the steel pipe, and quality inspection is required for checking and rechecking, which serves as the basis for subsequent steel pipe pressing and cutting;

[0049] S3: A 6-meter long false joint is needed at each end of the steel pipe, and a 2000-ton oil press is used for pressing. In the pressing process, the lower area of the steel pipe in the pressing area is heated and baked with an oven gun until the 7-meter long range of the steel pipe is pressed;

[0050] S4: After the final pressing is completed, the theoretical camber and the actual measured camber of each part of the steel pipe are compared;

[0051] S5: After the pressing is qualified, the joint position line, the processing position line and the center line corresponding to the processing position line are rechecked according to the drawing size, and the quality inspection is checked to ensure the accuracy before the joint cutting process is carried out;

[0052] S6: The cutting sequence is drawn on the steel pipe, and a cutting platform is set up in the workshop, and the steel pipe is cut according to the specified cutting sequence. In the cutting process, about 10mm area is left in the connection area of the relevant joint for temporary cutting;

[0053] S7: First, place the steel pipe joint in a horizontal state, then use a small crane to hang the upper opening of the steel pipe at both ends with hooks, and set supports at the joint connection point position. After the component is cooled, the subsequent cutting of the other 8 connection points is carried out;

[0054] S8: Then cut the joint at the port position of the steel pipe to cut the steel pipe into two half circle pipes;

[0055] S9: The longitudinal groove is opened on the half circle pipe, and the groove opening form is: 11° inside with 25mm root, 35° outside with 6mm root;

[0056] S10: After the longitudinal groove is opened, the half circle pipe is placed on the horizontal jig for positioning and fire correction;

[0057] S11: Collect the actual value and theoretical value data of the overall test piece as a reference for subsequent half circle pipe production.

[0058] In this embodiment, before cutting in step S6, the processing direction of the half circle is not at the center line position of the half circle, and the adjacent stage processing radius is not in the same plane. Therefore, the two side half circle pipes are combined into a whole circle pipe blank according to a certain rule, the whole circle pipe is rolled, and then the circle arc pipe is processed, and then the two circle arc half circle pipes are opened. In the cutting process, according to the cutting steps marked in Figure 2 , the local cutting is carried out according to the cutting steps marked in Figure 2 .

[0059] Figure 3 The black circle in the middle represents a 10mm long uncut area. Due to the instant the connection point broke, the component bounced open at the cut, accompanied by a loud noise. The width of the cut increased from approximately 5mm to 20mm. Therefore, a support should be installed at the cut connection point. Figure 4 As shown, this is to control deformation.

[0060] In this embodiment, the deviation between the actual and theoretical data is measured and recorded before correction in step 10. After verification by the quality inspection department, the data is corrected by fire.

[0061] Example 2

[0062] The semi-circular tube 3, manufactured by the bending method of the large-diameter thick-walled high-strength steel pipe, has a set of first auxiliary plates 31 and first partition plates 32 on its inner wall.

[0063] A large cross-section double-web waist-shaped node, comprising a semi-circular pipe made by the bending method of the large-diameter thick-walled high-strength steel pipe.

[0064] It also includes a box body 1, which is equipped with an anchor bolt assembly 2; the semi-circular tube 3 is disposed opposite to the two sides of the box body 1, and the length of the semi-circular tube 3 is longer than the length of the box body 1.

[0065] A set of upper port panel 4 and lower port panel 5, the upper port panel 4 and the lower port panel 5 are arranged opposite each other between the semi-circular tube 3 and are located at one end of the housing 1;

[0066] It also includes a cow leg 6, which is located on the outside of the semi-circular tube 3.

[0067] like Figure 5 The anchor bolt assembly 2 shown includes a support frame 21 and an anchor bolt 22. The support frame 21 has a loop-shaped opening, and the anchor bolt 22 extends through the lower end face of the loop-shaped opening to the bottom of the support frame 21.

[0068] like Figure 4 The box body 1 includes an upper top plate 11, a lower bottom plate 12 and a set of web plates 13. The upper top plate 11 and the lower bottom plate 12 are arranged opposite to each other. The support frame 21 is located between the upper top plate 11 and the lower bottom plate 12. The web plates 13 are located on both sides of the support frame 21, and their upper and lower ends are welded and fixed to the upper top plate 11 and the lower bottom plate 12 respectively.

[0069] like Figure 4 The box 1 shown has a set of vertical partitions 14 on both sides of the anchor bolt assembly 2. The vertical partitions 14 are arranged opposite to the first partition 32 in the semi-circular tube 3, and a segmented web plate 15 is provided between them.

[0070] The vertical partition 14 is provided with an open slot, and the second auxiliary plate 16 is arranged in the open slot. It should be noted that the end of the second auxiliary plate 16 away from the vertical partition 14 is connected with the corresponding upper top plate 11, lower bottom plate 12 and web plate 13.

[0071] The first partition 32 is semicircular or semicircular ring-shaped, and a group of openings are arranged on the outer side of the first partition 32. One side of the first auxiliary plate 31 is fixed with the semicircular pipe 3, and the other side is inserted into the opening of the first partition 32.

[0072] As shown in Figure 8 and Figure 9 The bracket 6 is arranged on the outer side of the semicircular pipe 3 and forms a Y-shaped node with the semicircular pipe 3, and the inner wall of the bracket 6 is provided with a third auxiliary plate 61.

[0073] The second partition 62 is arranged in the bracket 6, one side of the second partition 62 is welded and fixed with the outer wall of the semicircular pipe 3, and the other side is provided with an open slot. The side of the third auxiliary plate 61 away from the bracket 6 is inserted into the open slot.

[0074] Embodiment 3

[0075] As shown in Figures 4 to 7 and Figure 10 , 11 A super-large-section double-web waist-round node includes a box body 1, a group of semicircular pipes 3, a group of port upper panels 4 and port lower panels 5, and the box body 1 is provided with an anchor rod assembly 2. The semicircular pipes 3 are oppositely arranged on the two sides of the box body 1, the inner wall of the semicircular pipe 3 is provided with a group of first auxiliary plates 31 and a first partition 32, and the length of the semicircular pipe 3 is longer than the length of the box body 1. The port upper panel 4 and the port lower panel 5 are oppositely arranged between the semicircular pipes 3 and are arranged at one end of the box body 1.

[0076] The node further includes a group of brackets 6, the brackets 6 are arranged on the outer side of the semicircular pipe 3, and the node plates 63 are arranged between the two brackets 6. The end portions of the two node plates 63 are provided with sealing plates 64, and the port of the bracket 6 is provided with a bracket sealing plate 65.

[0077] As shown in Figure 5 The anchor rod assembly 2 includes a support frame 21 and an anchor rod 22. The support frame 21 is provided with a reverse-shaped opening, and the anchor rod 22 extends from the lower end face of the reverse-shaped opening to the lower side of the support frame 21.

[0078] As shown in Figure 4 The box body 1 includes an upper top plate 11, a lower bottom plate 12 and a group of web plates 13. The upper top plate 11 and the lower bottom plate 12 are oppositely arranged. The support frame 21 is arranged between the upper top plate 11 and the lower bottom plate 12. The web plates 13 are arranged on the two sides of the support frame 21, and the upper and lower ends thereof are respectively welded and fixed with the upper top plate 11 and the lower bottom plate 12.

[0079] As Figure 4 A set of vertical partitions 14 are arranged on both sides of the anchor rod assembly 2 in the box 1, the vertical partitions 14 are arranged opposite to the first partitions 32 in the semi-circular pipe 3, and a segmented web 15 is arranged between the vertical partitions 14.

[0080] The vertical partitions 14 are provided with open grooves, and the second partitions 16 are arranged in the open grooves. It should be noted that the end of the second partitions 16 away from the vertical partitions 14 is connected with the corresponding upper top plate 11, lower bottom plate 12 and web 13.

[0081] The first partitions 32 are semicircular or semi-circular ring-shaped, and a set of openings are arranged on the outer side of the first partitions 32. One side of the first partitions 31 is fixed with the semi-circular pipe 3, and the other side is inserted into the openings of the first partitions 32.

[0082] As Figure 11 The inner side of the node plate 63 is provided with a stiffener 66, and the two sides of the stiffener 66 are matched with the outer wall of the corresponding corbel 6.

[0083] In addition, it should be noted that the corbel 6 can be Y-shaped or V-shaped.

[0084] The above is only the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements, these improvements should also be considered as the protection scope of the present application.

Claims

1. A method for bending a large-diameter thick-walled high-strength steel pipe, characterized by: The method comprises the following steps: ​ S1: simulate the bending direction center line of each semicircle through the BIM model of the steel arch line type; S2: according to the drawing size, pop up the steel pipe joint position line and the processing position line with chalk, and mark the inside and outside of the steel pipe with a steel stamp, and leave a 30mm allowance at both ends of the steel pipe, and the steel pipe needs to be checked and rechecked for quality inspection, which serves as the basis for subsequent steel pipe pressing and cutting; S3: 6-meter long false joints are needed at both ends of the steel pipe, and pressing is performed through a 2000-ton oil press, and the lower area of the steel pipe in the pressing area is heated and baked with an oven gun until the 7-meter long range of the steel pipe is pressed; S4: after the final pressing is completed, compare the theoretical arch height and the actual measured arch height of each part of the steel pipe; S5: after the pressing is qualified, recheck the joint position line, the processing position line and the center line corresponding to the processing position line according to the drawing size, and submit them to the quality inspection for checking to ensure the accuracy before the joint cutting process is performed; S6: draw the cutting sequence on the steel pipe, set up a cutting platform in the workshop, and cut the joints of the steel pipe according to the specified cutting sequence, and leave about 10mm area at the connection area of the relevant joints during the cutting process; S7: first, place the joint of the steel pipe in a horizontal state, then use a small crane to hook the upper opening of both ends of the steel pipe with a hook, and set supports at the joint connection points, and then cut the subsequent 8 joint connection points after the component is cooled; S8: then, cut the joints at the port position of both ends of the steel pipe to cut the steel pipe into two semicircular pipes; S9: open the longitudinal groove on the semicircular pipe, and the groove opening form is: 11° inside with a root of 25mm, and 35° outside with a root of 6mm; S10: after the longitudinal groove is opened, position the semicircular pipe on the horizontal jig frame for fire correction; S11: collect the actual measured value and the theoretical value data of the overall test piece, which serves as a reference for the subsequent production of semicircular pipes. Before cutting in step S6, because the processing direction of the semicircle is not at the center line of the semicircle and the adjacent stage processing radius is not in the same plane, the two semicircular pipes are combined into a whole circular pipe according to a certain rule, the whole circular pipe is coiled, and then the circular pipe is processed, and then the two semicircular pipes are opened.

2. The pipe bending method of a large pipe diameter thick wall high strength steel pipe according to claim 1, characterized by: Before correction in step 10, measure the actual and theoretical data deviation value and make a record, and then submit it to the quality inspection for verification and then perform fire correction.

3. A semicircular pipe made by the bending method of the large pipe diameter thick wall high strength steel pipe according to claims 1 to 2, characterized by, The inner wall of the semicircular pipe (3) is provided with a group of first auxiliary plates (31) and first partition plates (32).

4. A double webbed haunch circular joint of super-elephant section, characterized by, The semicircular pipe is made of the large pipe diameter thick wall high strength steel pipe according to the method.

5. A large cross-section double webbed haunch circular joint according to claim 4, characterized in that: The box body (1) is provided with an anchor rod assembly (2); the semicircular pipes (3) are oppositely arranged on both sides of the box body (1), and the length of the semicircular pipe (3) is longer than the length of the box body (1); A group of port upper panels (4) and port lower panels (5) are oppositely arranged on the semicircular pipes (3) and arranged at one end of the box body (1). Further comprising a bracket (6) arranged outside the semicircular pipe (3); the anchor rod assembly (2) comprises a support frame (21) and an anchor rod (22), the support frame (21) is provided with a meandering opening, and the anchor rod (22) extends from the lower end face of the meandering opening to the lower side of the support frame (21).

6. The super large cross-section double webbed square tub node according to claim 5, characterized in that: The box (1) comprises an upper top plate (11), a lower bottom plate (12) and a plurality of webs (13), the upper top plate (11) and the lower bottom plate (12) are oppositely arranged, the support frame (21) is arranged between the upper top plate (11) and the lower bottom plate (12), and the webs (13) are arranged on both sides of the support frame (21) and are welded and fixed to the upper top plate (11) and the lower bottom plate (12) at the upper and lower ends thereof.

7. The super large cross-section double webbed square tub node according to claim 5, characterized in that: A plurality of vertical partitions (14) are arranged on both sides of the anchor rod assembly (2) in the box (1), the vertical partitions (14) are oppositely arranged with the first partition (32) in the semicircular pipe (3), and a segmented web (15) is arranged between the vertical partitions (14) and the first partition (32); the vertical partitions (14) are provided with open grooves, and the second partitions (16) are arranged in the open grooves.

8. The ultra-large cross-section double webbed square tub node according to claim 5, characterized in that: The first partition (32) is semicircular or semicircular ring-shaped, and a plurality of openings are arranged on the outer side thereof, one side of the first partition (31) is fixed to the semicircular pipe (3), and the other side is inserted into the openings of the first partition (32).

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