Construction method of inclined strut through type thick plate four cavity right angle trapezoidal section giant column

Abstract

The application is a construction method of a diagonal bracing through type thick plate four-cavity right angle trapezoidal section giant column; including the direction setting of cover plate and web plate; layout and blanking, hole making; groove setting; wall plate internal bolt welding; L-shaped structure assembly welding; trapezoidal structure and box body internal diagonal bracing node assembly welding; column bottom plate assembly welding; component external part assembly welding; component pre-assembly. The processing method adopted by the application can ensure that the space dimensions of the cavity internal cross stiffening plate and other parts of the component, the space dimensions of the trapezoidal section butt joint of the component end, the space dimensions of the component external box type diagonal bracing and the space dimensions of the column bottom plate dense anchor bolt hole group all meet the specification requirements under the premise of the most economic and efficient, and ensure that the thick plate penetration welding seam flaw detection all meets the specification requirements, achieves the similar through type effect of the diagonal bracing and the internal partition plate, and ensures the qualified on-site installation of the component.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel structure construction, and particularly relates to a construction method of a diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column. BACKGROUND

[0002] With the rapid development of the construction field, the super high-rise building has also entered a construction peak period, and a thick plate type steel structure giant column has been widely applied, and a diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column gradually appears in people's field of vision.

[0003] The diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column is responsible for bearing the main load of the building structure, and the component form is complex. Figure 1 As shown in the figure, the diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column has a component main wall plate with a thickness of 60 mm, is composed of a 40 mm thick vertical cross stiffener plate in length, and is divided into four cavities by the vertical cross stiffener in the interior, each cavity contains multiple 40 mm thick horizontal partition plates, the component has a 60 mm thick box type support connected to the outside, the component bottom plate has a thickness of 90 mm, and the single piece bottom plate contains 123 foundation bolt holes; the component body weld is a full penetration weld in length, the internal cross stiffener plate body weld and the connecting weld between the internal cross stiffener plate and the wall plate are both full penetration welds, the connecting weld between the internal horizontal partition plate and the wall plate and the vertical cross stiffener plate is a full penetration weld, the component outside box type diagonal strut body weld and the connecting weld between the component outside box type diagonal strut and the wall plate are both full penetration welds, and the connecting weld between the component body and the column bottom plate is a full penetration weld.

[0004] Considering the complexity of the component, the subsequent steel structure component construction method cannot be directly applied. SUMMARY

[0005] The application aims to provide a diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column processing method, which ensures that the component is successfully installed on site.

[0006] In order to achieve the above-mentioned purpose, the application is implemented as follows:

[0007] A diagonal-strut-through-thick-plate four-cavity right-angled trapezoidal-section giant column construction method comprises the following steps.

[0008] Step 1, direction setting of the cover plate and the web plate: the directly connected surface between the thickness direction of the body wall plate and the thickness direction of the component box type diagonal strut wall plate is set as the body cover plate, and the non-directly connected surface is set as the body web plate.

[0009] Step 2, layout, blanking, and hole making: the length of the component wallboard is increased by 30 mm for welding shrinkage, and the width of the wallboard is increased by 6 mm on each side for welding shrinkage; after the column bottom plate is blanked, the positioning dimensions of the anchor bolt holes are drawn on the corresponding positions according to the drawing, and after the detection is qualified, the sample piercing point is knocked out at the center of the hole, and then the hole is made; a taper shank drill is used to make the hole, and during the process, a small diameter drill bit is used for trial drilling, and then the final hole is made to ensure that the center positioning deviation of the finally made anchor bolt hole is within 0.5 mm, and the perpendicularity deviation of the hole wall and the bottom plate is controlled within 1 mm;

[0010] Step 3, groove setting: the body weld straight angle edge and obtuse angle edge wallboard is set according to the requirement of 26° on both sides, 13° on each side, and 10 mm gap; the body weld acute angle edge wallboard is set according to the requirement of natural groove 30° and 6 mm gap; after the groove setting is completed, the groove should be polished and smoothed, and the welding position should not have impurities that affect welding;

[0011] Step 4, internal bolt welding of wallboard: the internal bolt of the wallboard is welded with the wallboard, and during the welding process, the axis of the welding gun and the bolt should be perpendicular to the surface of the workpiece, the inclination of the welded component during flat welding should not exceed 15°, and at the same time, the welding gun should be lightly pressed by hand to keep the welding gun, bolt and porcelain ring in a stationary state; the welding gun should be kept stationary during the process of arc striking, lifting and pressing, and the welding gun should be lightly lifted after welding is completed; finally, the positions with welding defects are repaired using gas shielded welding;

[0012] Step 5, L-shaped structure assembly welding: after the jig is leveled, the lower wallboard, vertical cross stiffener, horizontal partition and right angle edge wallboard are assembled in turn, and the lower wallboard in contact with the jig is the maximum side length wallboard of the component trapezoidal cross section; before assembly, the connecting contact surface and the rust, burrs and dirt within a range of 30-50 mm along the edge of the assembly welding position should be cleaned; due to the limited internal space of the steel column, the fusion welding seam cleaning process should be reduced as much as possible, and a 45° single groove is set at the part welding position, and a 6 mm welding gap is left for assembly; after assembly, the size is rechecked, and it is positioned firmly, the preheating temperature of the positioning welding is 100-120℃, the welding seam thickness is 10 mm, the length is 240 mm, and the spacing is 400 mm;

[0013] Step 6, assembly welding of trapezoidal structure and box body diagonal brace nodes: complete the assembly process of the trapezoidal inclined wallboard and the upper wallboard, recheck the cross-sectional size of the steel column, and remove the impurities from the welding area and polish it smoothly; before welding the component, add a tie plate at the four corners of the wallboard and the connection between the wallboard and the cross stiffener to prevent the cross section from deforming during welding; the thickness of the tie plate is 20 mm, and the length of the contact edge is 300 mm;

[0014] Step 6.1, welding all the welds, then welding the cross stiffening body welds and connecting welds 1-6 between the wall plates;

[0015] Step 6.2, the components are placed and hoisted to the vertical state, vertical positioning stiffening plates are added between the inner diaphragms corresponding to the diagonal braces, the horizontal diaphragms corresponding to the diagonal braces are welded to the cross stiffening plates and trapezoidal wall plates 7-8, and four welders simultaneously perform symmetrical operations during welding;

[0016] Step 6.3, horizontal diaphragm flat welding accelerates welding efficiency and improves the pass rate of penetration welds, forming inner and outer penetration welds to achieve the effect of diagonal braces penetrating the column;

[0017] Step 6.4, finally weld the four main body welds of the wall plate, the bottom layer is welded by gas shielded welding, the filler layer and the surface layer are welded by submerged arc welding, the acute angle main weld and the adjacent right angle main weld 9-10 are welded first, then the obtuse angle main weld and the adjacent right angle main weld 11-12 are welded in turn, the filler layer is welded in the opposite direction 12-9, and the welds are welded in turn to both sides at the length center position respectively during the welding process to reduce deformation;

[0018] Step 7, column bottom plate assembly welding: after the component body assembly and welding are completed, the dimensions are checked, and the penetration welds are treated by UT detection, and the results meet the requirements, then draw the body assembly position line on the column bottom plate, and complete the welding groove setting of the column bottom, the groove form is 45° single-sided external welding groove, leaving a 6mm welding gap, and reserving 8mm welding shrinkage allowance in the length direction; then complete the assembly between the column bottom plate and the column body, recheck the flatness and space size of the column bottom plate after assembly, and firmly spot weld it after meeting the requirements, and finally weld the column bottom plate and the column body, multiple welders simultaneously perform symmetrical welding on four sides during the welding process to reduce welding deformation; after welding, the space size is checked again and the UT detection result is detected;

[0019] Step 8, component external part assembly welding: according to the spatial positioning size of the external diagonal brace bracket of the steel column, complete the assembly welding process, and complete the assembly welding process of the external steel reinforcement connector, then complete the component external bolt welding process, set the field welding groove, polish the component welds to ensure that the component appearance meets the requirements, and finally the component is accepted after passing the test, knock the steel stamp number and mark the positioning sample punch point, and prepare for pre-assembly work;

[0020] Step 9, component pre-assembly: the pre-assembly site should be flat and solid to avoid settlement due to the self-weight of the components; the jig used for pre-assembly should have sufficient strength, rigidity and stability; the components should be pre-assembled in a free state, and the three sub-components of each section are sequentially pre-assembled according to the component size drawing; the on-site welding gap between the sub-components should be consistent with the drawing; the total length of the pre-assembled unit, the bending loss height of the pre-assembled unit, the interface misalignment, the column body distortion of the pre-assembled unit and the distance from the top surface to any bracket are sequentially measured; and after meeting the requirements, the components are prepared for delivery.

[0021] The diagonal bracing through type thick plate four-cavity right trapezoidal section giant column processing method adopted by the application can ensure that the space dimensions of the cross stiffening plate and other parts inside the cavity of such components, the space dimensions of the trapezoidal section butt joint of the end part of the component, the space dimensions of the box type diagonal bracing and other parts outside the component and the space dimensions of the group of dense foot bolt holes of the column bottom plate all meet the specification requirements under the premise of the most economical and efficient, and ensure that the thick plate penetration welding seam flaw detection all meets the specification requirements, achieves the similar penetration effect of the diagonal bracing and the inner partition plate, and ensures that the component on-site installation is qualified. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a diagonal bracing through type thick plate four-cavity right trapezoidal section giant column.

[0023] Figure 2 It is a construction method flowchart shown in the application.

[0024] Figure 3 It is a method shown in the application Figure 1 .

[0025] Figure 4 It is a method shown in the application Figure 2 .

[0026] Figure 5 It is a method shown in the application Figure 3 .

[0027] Figure 6 It is a method shown in the application Figure 4 .

[0028] Figure 7 It is a method shown in the application Figure 5 .

[0029] Figure 8 It is a method shown in the application Figure 6 .

[0030] Figure 9 It is a method shown in the application Figure 7 .

[0031] Figure 10A schematic diagram of the method shown in the present application Figure 8 . DETAILED DESCRIPTION

[0032] The present application is further illustrated below by specific examples.

[0033] As shown in Figure 1 , Figure 3 , a construction method of a diagonal bracing through type thick plate four-cavity right angle trapezoidal section giant column, comprising:

[0034] Step 1, cover plate and web direction setting: in order to prevent the joint action of the body weld and the connecting weld between the diagonal bracing wall plate and the body from having an adverse effect on the layered tearing of the thickness direction of the component body wall plate, the directly connected surface of the thickness direction of the component body wall plate and the thickness direction of the component box type diagonal bracing wall plate is set as the body cover plate, and the non-directly connected surface is set as the body web; as shown in the accompanying Figure 3 .

[0035] Step 2, layout, blanking and hole making: the length direction of the component wall plate is increased by 30mm for welding shrinkage allowance, and the width direction of the wall plate is increased by 6mm for welding shrinkage allowance on each side; after the column bottom plate is blanked, the positioning dimensions of 123 anchor bolt holes are drawn at the corresponding positions according to the drawing, and after the detection is qualified, sample punch points are knocked out at the hole center positions, and then the holes are made; a taper shank drill is used to make the holes, and during the process, a small diameter drill bit is used for trial drilling, and then the final hole making is performed, so that the center positioning deviation of the finally made anchor bolt hole is within 0.5mm, and the perpendicularity deviation of the hole wall and the bottom plate is controlled within 1mm, so as to increase the installation safety factor and avoid that the dense anchor bolts on site cannot be freely passed through the hole group at one time.

[0036] Step 3, groove setting: the right angle edge and the obtuse angle edge wall plate of the body weld is set according to the requirement of 26 degrees on both sides, 13 degrees on each side and 10mm gap; the acute angle edge wall plate of the body weld is set according to the requirement of natural groove 30 degrees and 6mm gap. After the groove setting is completed, the groove should be polished and smoothed, and there should be no impurities affecting welding at the welding position.

[0037] As shown in the accompanying Figure 4 .

[0038] Step 4, internal bolt welding of wall plate: the internal bolt of the wall plate is welded with the wall plate. During the welding process, the axis of the welding gun and the bolt should be perpendicular to the surface of the workpiece, the inclination of the welded component during flat welding should not exceed 15°, and at the same time, the welding gun, the bolt and the porcelain ring should be kept in a static state by lightly pressing the welding gun with the hand; the welding gun should be kept static during the process of arc striking, lifting and pressing of the welding gun, and the welding gun should be lifted lightly after the welding is completed; finally, the positions with welding defects are repaired by using gas shielded welding.

[0039] Step 5, L-shaped structure assembly welding: after the jig is leveled, the lower wall plate, vertical cross stiffener plate, horizontal partition plate and right-angle edge wall plate are assembled in sequence, and the lower wall plate in contact with the jig is the largest side length wall plate of the component trapezoidal section; before assembly, the connecting contact surface of the assembly welding position and rust, burrs, dirt and the like within a range of 30-50 mm along the edge are cleaned; the internal space of the steel column is limited, and the fusion welding seam cleaning process should be reduced as much as possible, the 45° single V-groove is provided at the part welding position, and the 6 mm welding gap is left; after the assembly is completed, the size is rechecked, and the positioning is firm, the preheating temperature of the positioning welding is 100-120℃, the welding seam thickness is 10 mm, the length is 240 mm, and the interval is 400 mm.

[0040] Step 6, trapezoidal structure and box body inner diagonal bracing node assembly welding: the assembly process of the trapezoidal inclined wall plate and the upper wall plate is completed, the steel column section size is rechecked again, and the welding bead part is cleaned of impurities and polished smooth. Before welding of the component, a tie plate is provided at the four corners of the wall plate and the cross stiffening connection, so as to prevent deformation of the section during welding, the thickness of the tie plate is 20 mm, and the contact edge length is 300 mm, as shown in the accompanying Figure 5 First, all the welding seams are welded, then the cross stiffening body welding seam and the connecting welding seam 1-6 between the wall plate are welded, as shown in the accompanying Figure 6 Then, the component is placed and hoisted to the vertical state, a vertical positioning stiffener plate is provided between the inner partition plates corresponding to the diagonal bracing, the horizontal partition plate and the cross stiffener plate and the trapezoidal wall plate welding seams 7-8 corresponding to the diagonal bracing are welded, and four welding personnel simultaneously perform symmetrical operation during the welding process, as shown in the accompanying Figure 7 The horizontal partition plate flat welding can speed up the welding efficiency and improve the penetration welding seam qualification rate, and the inner and outer penetration welding seams achieve the effect of the diagonal bracing penetrating the column body; finally, four main body welding seams of the wall plate are welded, the backing layer is welded in the way of gas shielded welding, and the filler layer and the surface layer are welded in the way of submerged arc welding, as shown in the accompanying Figure 8 The backing layer is first welded with acute angle main welding and adjacent right angle main welding seam 9-10, then blunt angle main welding and adjacent right angle main welding seam 11-12 are welded in sequence, the filler layer is welded in the reverse direction, and the welding seam is welded in sequence to both sides at the length center position, so as to reduce deformation.

[0041] Step 7, column base plate assembly welding: after the component body is assembled and welded, the size is checked, the UT flaw detection treatment is carried out on the fusion welding seam, the position line of the body assembly is drawn on the column base plate after the result meets the requirements, and the welding groove opening is completed at the bottom of the steel column, the welding groove form is 45° single-sided external welding groove, 6mm welding gap is reserved, 8mm welding shrinkage allowance is reserved in the length direction; then the assembly between the column base plate and the column body is completed, the flatness and the space size of the column base plate after assembly are rechecked, the column base plate is firmly spot welded after meeting the requirements, and finally the welding between the column base plate and the column body is carried out, four welders simultaneously symmetrically weld on four sides during the welding process, welding deformation is reduced, and the space size is checked again after welding and the UT flaw detection result is detected.

[0042] Step 8, component external part assembly welding: according to the space positioning size of the external diagonal bracing bracket of the steel column, as shown in the drawings, Figure 9 the assembly welding process is completed, the external reinforcement connector is assembled and welded, then the component external stud welding process is completed, the site welding groove is opened, the component weld is polished to ensure that the component appearance meets the requirements, and finally the component is accepted after being qualified, the steel stamp number is knocked, and the positioning sample punch point is marked, and the pre-assembly work is prepared.

[0043] Step 9, component pre-assembly: the pre-assembly site should be flat and solid to avoid settlement due to the self weight of the component; the cradle used for pre-assembly should have sufficient strength, rigidity and stability; the component should be pre-assembled in a free state, and the three sub-components are sequentially pre-assembled according to the component size drawing, as shown in the drawings, Figure 10 the site welding gap between the sub-components is required to be consistent with the drawing, the pre-assembled component is measured by the inspection personnel, the total length of the pre-assembled unit, the bending loss height of the pre-assembled unit, the interface edge, the pre-assembled unit column body distortion and the distance from the top surface to any bracket are measured, and the component is prepared for delivery after meeting the requirements.

[0044] The diagonal bracing through type thick plate four-cavity right trapezoidal section giant column processing method adopted in the application can ensure that the space sizes of parts such as cross stiffening plates inside the cavity of such components, the space size of the trapezoidal section butt joint of the component end, the space size of the external box type diagonal bracing of the component and the space size of the dense group of anchor bolt holes of the column base plate all meet the specification requirements under the premise of the most economic and efficient, and ensure that the thick plate fusion welding seam flaw detection all meets the specification requirements, achieves the similar through type effect of diagonal bracing and inner partition plate, and ensures that the component is qualified in the field installation.

Claims

1. A method for constructing a diagonally braced, through-type, thick-plate, four-cavity, right-angled trapezoidal cross-section mega-column, characterized by: include Step 1, Setting the orientation of the cover plate and web plate: The surface directly connected to the thickness direction of the body wall plate and the thickness direction of the component box-type diagonal brace wall plate is set as the body cover plate, and the surface not directly connected is set as the body web plate. Step 2, Layout, Cutting, and Hole Making: A 30mm welding shrinkage allowance is added to the length of the component wall panel, and a 6mm welding shrinkage allowance is added to each side of the width of the wall panel. After the column base plate is cut, the positioning dimensions of the anchor bolt holes are drawn in the corresponding positions according to the drawings. After passing the inspection, a punch mark is made at the center of the hole, and then the hole is made. A tapered shank drill is used for hole making. During the process, a small-diameter drill bit is used for trial drilling first, and then the final hole is made. The center positioning deviation of the final anchor bolt hole is guaranteed to be within 0.5mm, and the perpendicularity deviation between the hole wall and the base plate is controlled within 1mm. Step 3, Beveling: For right-angled and obtuse-angled wall panels of the main body weld, beveling should be done according to the requirements of 26° on both sides, 13° on each side, and a 10mm gap; for acute-angled wall panels of the main body weld, beveling should be done according to the requirements of 30° natural beveling and a 6mm gap; after beveling, the beveling should be ground smooth, and there should be no impurities in the welding area that would affect the welding. Step 4, Welding of internal studs in the wall panel: Weld the internal studs of the wall panel to the wall panel. During the welding process, the axis of the welding torch and the studs should be kept perpendicular to the surface of the workpiece. When welding flat, the inclination of the welded component should not exceed 15°. At the same time, press the welding torch lightly by hand to keep the welding torch, studs, and ceramic ring in a stationary state. Keep the welding torch stationary during the process of arc ignition, lifting, and pressing down. After the welding is completed, gently lift the welding torch. Finally, use gas shielded welding to repair any areas with welding defects. Step 5, L-shaped structure assembly and welding: After leveling the jig, assemble the lower wall panel, vertical cross stiffening plate, horizontal partition, and right-angle side wall panel in sequence. The lower wall panel in contact with the jig is the wall panel with the longest side of the trapezoidal cross section of the component. Before assembly, clean the rust, burrs, and dirt from the connection and contact surfaces at the assembly and welding points and from the edge within 30-50mm. Due to the limited internal space of the steel column, the root cleaning process of the penetration weld should be minimized. Assemble the parts by opening a 45° single bevel at the welding points and leaving a 6mm welding gap. After assembly, check the dimensions and securely position the components. The preheating temperature for the tack weld is between 100-120℃, the weld thickness is 10mm, the length is 240mm, and the spacing is 400mm. Step 6: Assemble and weld the trapezoidal structure and the diagonal bracing nodes inside the box: Complete the assembly process of the trapezoidal inclined wall panel and the upper wall panel, recheck the cross-sectional dimensions of the steel column, and remove debris from the weld area and grind it smooth; Before welding the components, add tie plates at the four corners of the wall panel and at the joint between the wall panel and the cross stiffener to prevent the cross-section from deforming during the welding process. The thickness of the tie plate is 20mm and the contact edge length is 300mm. Step 6.1: Add additional welding to all welds, and then weld the cross stiffening body weld and the connection welds 1 to 6 between the body and the wall panel; Step 6.2: Place and hoist the components to an upright position, add vertical positioning stiffening plates between the inner partitions of the corresponding diagonal braces, and weld the transverse partitions of the corresponding diagonal braces to the cross stiffening plates and trapezoidal wall panels at welds 7-8. During the welding process, four welders work symmetrically at the same time. Step 6.3: Flat welding of the transverse partition accelerates welding efficiency and improves the pass rate of the penetration weld, forming an internal and external penetration weld to achieve an effect similar to the diagonal bracing penetrating the column; Step 6.4: Finally, weld the four main welds of the wall panel. The root pass is welded using gas shielded welding. The filler and cover passes are all welded using submerged arc welding. For the root pass, first weld the acute angle main weld and the adjacent right angle main weld 9-10, then weld the obtuse angle main weld and the adjacent right angle main weld 11-12 in sequence. For the filler pass, weld the welds 12-9 in the opposite direction. During the welding process, weld from the center of the length to both sides in sequence to reduce deformation. Step 7: Column Base Plate Assembly and Welding: After the main body of the component is assembled and welded, its dimensions are checked. The penetration welds are subjected to UT (Ultra-Touch) testing. If the results meet the requirements, the assembly position lines are drawn on the column base plate. A 45° single-sided external welding bevel is then created at the bottom of the steel column, leaving a 6mm welding gap and an 8mm welding shrinkage allowance along the length. Next, the column base plate is assembled with the column body. After assembly, the flatness and spatial dimensions of the column base plate are checked. If they meet the requirements, it is tack-welded securely. Finally, the column base plate is welded to the column body. During welding, multiple welders simultaneously perform symmetrical welding on all four sides to reduce welding deformation. After welding, the spatial dimensions and UT testing results are checked again. Step 8: Assembly and welding of external components: Based on the spatial positioning dimensions of the external diagonal bracing bracket of the steel column, complete the assembly and welding process, and complete the assembly and welding process of the external steel bar connector. Then, complete the welding process of the external studs of the component, open the on-site welding bevel, grind the component weld to ensure that the appearance of the component meets the requirements, and finally, after the component passes the acceptance inspection, stamp the steel stamp number and mark the positioning punch point to prepare for the pre-assembly work. Step 9, Component Pre-assembly: The pre-assembly site should be flat and firm to avoid settlement due to the weight of the components; the jig used for pre-assembly should have sufficient strength, rigidity and stability; the components should be pre-assembled in a free state, and each section of three sub-components should be pre-assembled in sequence according to the component dimension drawing. The on-site welding gap between sub-components should be consistent with the drawing. For the pre-assembled components, measure the total length of the pre-assembled unit, the bending height of the pre-assembled unit, the misalignment of the interface, the twisting of the pre-assembled unit column, and the distance from the top surface to any bracket in sequence. After meeting the requirements, prepare the components for shipment.

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