CN113500273A - Steel box girder construction welding process - Google Patents
Steel box girder construction welding process Download PDFInfo
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- CN113500273A CN113500273A CN202110632645.7A CN202110632645A CN113500273A CN 113500273 A CN113500273 A CN 113500273A CN 202110632645 A CN202110632645 A CN 202110632645A CN 113500273 A CN113500273 A CN 113500273A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention discloses a steel box girder construction welding process, which comprises the following steps: step one, selecting steel materials: the user selects the Q345qc steel sheet as steel box girder main part in advance, and the main steel of steel box girder is roof, outside web, arc bottom plate, web, bottom plate, baffle, inboard web and inboard web in the outside, and supplementary material steel sheet chooses high carbon steel for use, and supplementary material steel sheet is reinforcing floor, roof vertical rib and bottom plate vertical rib. According to the invention, through the matching of the processes of steel material selection, steel material pretreatment, frame gap position adjustment, frame positioning, main frame welding, welding spot, welding seam primary flaw detection, auxiliary frame welding, welding spot, welding seam secondary flaw detection, repair section repair welding and welding spot and welding seam tertiary flaw detection, accurate selection is performed on the selected materials, the overall quality of the basic steel material is improved, meanwhile, the welding is performed by adopting a main frame and auxiliary frame sectional welding mode, and the flaw detection is performed in time after each stage is finished, so that the welding quality of each stage is improved.
Description
Technical Field
The invention relates to the technical field of steel box girders, in particular to a welding process for steel box girder construction.
Background
The steel box girder is also called as a steel plate box girder, is a common structural form of a large-span bridge, is generally used on a bridge with a larger span, and is called as the steel box girder because the shape is like a box, and has the characteristics that: in large-span cable support bridge, the span of steel case girder reaches several hundred meters and to last kilometers, generally divide into a plurality of beam sections and make and install, and its cross section has broad width and flat appearance characteristics, and the aspect ratio reaches 1: about 10.
In large-scale capital construction facilities such as building bridges, cross-bridge expressways and the like, the steel box girder needs to be used, however, the steel box girder is formed by welding and manufacturing a plurality of steel plate components, and the welding process of the existing steel box girder used in the construction welding process, the welding precision and the welding seam welding spot quality are not ideal, the sectional welding of a main frame and an auxiliary frame cannot be adopted, and most of the steel box girders are subjected to one-step flaw detection, the ultrasonic detection of flaw detection cannot be carried out in time after the completion of the sectional welding stage, the situations of welding missing, wrong welding and the like occur after the welding of the steel box girder are caused, the difficulty of finding is higher, the difficulty of repairing is also higher, the welding stress between the whole steel materials of the steel box girder cannot be eliminated, the stability of the whole welding of the steel box girder is reduced, and the welding hidden danger of the steel box girder is increased.
Therefore, it is necessary to design a welding process for steel box girder construction to solve the above problems.
Disclosure of Invention
The invention aims to provide a construction welding process for a steel box girder, which aims to solve the problems of unsatisfactory welding precision and welding spot quality of welding seams of the existing welding process used in the construction welding process of the steel box girder in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a steel box girder construction welding process comprises the following steps:
step one, selecting steel materials: a user selects a Q345qc steel plate as a steel box girder main body in advance, main steel of the steel box girder comprises a top plate, an outer web plate, an arc-shaped bottom plate, an outer middle web plate, a bottom plate, a partition plate, an inner middle web plate and an inner web plate, an auxiliary steel plate is made of high-carbon steel, and the auxiliary steel plate comprises a reinforcing rib plate, a top plate vertical rib and a bottom plate vertical rib;
step two, steel pretreatment: then, a user uses a grinding wheel and abrasive paper to grind and clean rust stains and residues on the surfaces of the steel box girder and the auxiliary material steel plate, and particularly the positions of welding seams and welding points of the steel box girder and the auxiliary material steel plate;
step three, adjusting the position of the frame clearance: then, positioning and adjusting gaps, alignment positions and welding spot positions of welding seams between main steel and auxiliary steel of each steel box girder by using the positioning horse plates by a user;
step four, positioning the frame: then, fixing the welding positions of the main steel and the auxiliary steel of the steel box girder by a triangle positioning method by using a special positioning steel plate by a user;
step five, welding the main frame: then, a user welds the main body frame of the steel box girder by adopting various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding;
step six, performing primary flaw detection on welding spots and welding seams: after the main frame of the steel box girder is welded, a user uses a flaw detector to perform flaw detection on the positions of the welding seams and welding points of the top plate, the outer web plate, the arc-shaped bottom plate, the outer middle web plate, the bottom plate, the partition plate, the inner middle web plate, the inner web plate and the inner web plate, and whether the detection is qualified or not;
seventhly, welding an auxiliary frame: after the welding flaw detection of the main body frame of the steel box girder is qualified, a user also adopts various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding to weld steel products of the reinforcing rib plate of the auxiliary frame, the vertical rib of the top plate and the vertical rib of the bottom plate;
eighthly, secondary flaw detection of welding spots and welding seams: after the auxiliary frame steel is welded, a user uses a flaw detector to perform flaw detection on the positions of welding seams and welding spots of the reinforcing rib plate, the top plate vertical rib and the bottom plate vertical rib steel, detects whether the detection is qualified or not, removes welding meat after the flaw detection is unqualified, cleans welding operation again, and uses the flaw detector to detect after secondary welding is completed until the welding is qualified;
ninth, repair welding of the repair section: after the welding flaw detection of the auxiliary frame of the steel box girder is qualified, a user carries out ultrasonic detection and repair on the positions of all welding seams and welding points of the steel by using an ultrasonic detector, and repair welding operation is carried out on the positions of missed welding and wrong welding of the whole steel of the steel box girder;
step ten, performing three-time flaw detection on welding spots and welding seams: after the whole welding of steel box girder is accomplished, the user reuses the appearance of detecting a flaw to the whole steel of steel box girder and detects a flaw, treats that whole welding seam of steel box girder, solder joint position are all up to standard after, can deliver and use.
Preferably, in the first steel material selection process, the plate thickness range of the Q345qc steel plate is 18-21mm, the thickness range of the corner joint steel plate at the support of the steel box girder is 23-28mm, the yield strength of the main steel of the steel box girder is more than or equal to 400, the tensile strength of the main steel of the steel box girder is more than or equal to 520, the elongation after fracture is more than or equal to 20%, and the weld crack sensitivity index is less than or equal to 0.2%.
Preferably, in the process of adjusting the gap position of the frame in the third step, the tolerance ranges of the gap, the alignment position and the welding point position of the welding seam between the main steel material and the auxiliary steel material of each steel box girder are between 0.2 +/-0.05 mm and 0.3 +/-0.05 mm.
Preferably, in the step four frame positioning process, a user positions three positioning horse plates in a three-point distribution manner at the welding positions of the main steel and the auxiliary steel in advance, and the three positioning horse plates form an equilateral triangle, an isosceles triangle and a common triangle according to the position condition of the field steel.
Preferably, in the process of welding the five main frames and the seven auxiliary frames, four welding modes of horizontal welding, vertical welding, overhead welding and transverse welding are adopted for butt welding and diagonal welding of the steel plates, single-side V-shaped grooves are adopted for the top plate and the bottom plate, no gap exists, 4mm truncated edges are left, the ceramic liner is pasted on the back surface, the ceramic liner is welded on the back surface in a single-side forming mode, the top plate is bottomed by carbon dioxide arc welding, ER50-6 welding wires are selected, cover surfaces are filled by submerged arc automatic welding, H10-Mn2 welding wires are selected, and the cover surfaces are directly filled by the bottom plate and other main frame steel materials by carbon dioxide arc welding.
Preferably, in the welding process of the five-step main frame and the welding process of the seven-step auxiliary frame, the electric welding and the positioning welding of the steel plates are both welded by adopting a manual welding gun, the welding rod is E5015, the E5015 welding rod is placed in a drying box for drying and storing in batches before being used, the drying temperature setting interval of the drying box is between 50 and 80 ℃, the voltage range of the welding gun is 25V to 30V, and the current is 250A to 300A.
Preferably, in the processes of six welding spots, primary flaw detection of welding seams, eight welding spots, secondary flaw detection of welding seams, ten welding spots and three flaw detection of welding seams, before detection by a flaw detector, a user cleans splashes, particle impurities, oxide scales, pits, corrosion and the like on the surface of the welding position of a steel plate in advance, the finishing width of the flaw detection surfaces on two sides of each welding seam is between 80 and 120mm, and the user comprehensively judges the flaw position and the welding mode according to the shape of a flaw waveband on a fluorescent screen of the flaw detector and the height change of reflected waves.
Preferably, before the repair welding process of the ninth repair section, a user welds the outer side reinforcing steel rod and the inner side reinforcing steel rod between the outer side web plate and the outer side middle web plate and between the inner side web plate and the inner side middle web plate respectively in a manual welding mode, and then welds the cross steel frame between the outer side middle web plate and the inner side middle web plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the steel box girder construction welding process comprises the steps of steel material selection, steel material pretreatment, frame gap position adjustment, frame positioning, main frame welding, welding spots, primary flaw detection of welding spots, auxiliary frame welding, welding spots, secondary flaw detection of welding spots, repair welding and welding spots, flow cooperation of tertiary flaw detection of welding spots, accurate selection is performed on the selected materials, overall quality of basic steel materials is improved, meanwhile, the main frame and auxiliary frame sectional type welding mode is adopted for welding, in-time flaw detection is performed after completion of each stage, welding quality of each stage is improved, whether wrong welding and welding missing phenomena occur in the welding spots of the welding spots can be found in time, overall welding quality of a steel beam box is improved, overall welding stability of the steel beam box is enhanced, and meanwhile stress between steel plates is eliminated to the greatest extent.
2. According to the construction welding process for the steel box girder, the thickness range of a flat plate of a Q345qc steel plate is 18-21mm, the thickness range of a corner joint steel plate at a support of the steel box girder is 23-28mm, the size requirements of steel plates of steel box girders with most different specifications are met, the overall compression resistance, tension resistance and yield resistance of the steel box girder steel plate are improved and the welding effect among the steel plates is enhanced by the yield strength of a main steel of the steel box girder is more than or equal to 400, the tensile strength of the main steel of the steel box girder is more than or equal to 520, the elongation after fracture is more than or equal to 20% and the sensitivity index of welding cracks is less than or equal to 0.2%, the dimensional tolerance error between each main steel of the steel box girder and an auxiliary steel is within a reasonable range and the overall welding stability of the steel box girder is prevented from being influenced by overlarge error, and a triangle is formed by three positioning steel plates according to the position conditions of the steel on site, Isosceles triangle and ordinary triangle-shaped shape have the steadiness according to triangle-shaped, strengthen the fixed effect in location between each steel sheet, avoid appearing displacement and dislocation among the steel sheet welding process.
3. The steel box girder construction welding process adopts four welding modes of flat welding, vertical welding, overhead welding and transverse welding through butt welding and diagonal welding of steel plates, meets the requirements of welding modes at different positions, enhances the welding effect of a main frame and an auxiliary frame to the maximum extent, improves the welding precision and quality between the steel plates, adopts manual welding guns for welding and positioning welding through the steel plates, is beneficial to a user to carry out welding operation in a narrow space, is convenient for the user to carry out pre-welding and fixing operation on the steel box girder, eliminates the whole welding stress between the steel plates, and before the detection of a flaw detector, the user cleans splashes, particle impurities, oxide skins, pits, corrosion and the like on the surface of the welding position of the steel plates in advance, avoids the influence of external factors on the detection result of the flaw detector, improves the detection precision of the flaw detector, so as to provide a reasonable and accurate judgment and evaluation basis for the user, through outside reinforcing steel pole and inboard reinforcing steel pole, can play the effect of firm reinforcement between web and inboard web in outside web and the outside, improve whole pressurized bearing capacity between web and inboard web in outside web and the outside and inboard, through alternately steelframe, improve the compressive property between web and the inboard web in the outside, avoid web and inboard in the outside in the web surface atress take place extrusion deformation.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a flow chart of the steps of the present invention;
fig. 3 is a structural front view of the steel box girder of the present invention.
In the figure: 1. a top plate; 2. an outboard web; 3. an arc-shaped bottom plate; 4. an outboard medial web; 5. a base plate; 6. a partition plate; 7. an inboard medial web; 8. an inner web; 9. a reinforcing rib plate; 10. a top plate vertical rib; 11. a bottom plate vertical rib; 12. an outer reinforcing steel bar; 13. an inner side reinforcing steel bar; 14. and (4) crossing steel frames.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an embodiment of the present invention is shown:
a steel box girder construction welding process comprises the following steps:
step one, selecting steel materials: a user selects a Q345qc steel plate as a steel box girder main body in advance, the main steel of the steel box girder comprises a top plate 1, an outer web 2, an arc-shaped bottom plate 3, an outer middle web 4, a bottom plate 5, a partition plate 6, an inner middle web 7 and an inner web 8, an auxiliary steel plate is made of high-carbon steel, and the auxiliary steel plate comprises a reinforcing rib plate 9, a top plate vertical rib 10 and a bottom plate vertical rib 11;
step two, steel pretreatment: then, a user uses a grinding wheel and abrasive paper to grind and clean rust stains and residues on the surfaces of the steel box girder and the auxiliary material steel plate, and particularly the positions of welding seams and welding points of the steel box girder and the auxiliary material steel plate;
step three, adjusting the position of the frame clearance: then, positioning and adjusting gaps, alignment positions and welding spot positions of welding seams between main steel and auxiliary steel of each steel box girder by using the positioning horse plates by a user;
step four, positioning the frame: then, fixing the welding positions of the main steel and the auxiliary steel of the steel box girder by a triangle positioning method by using a special positioning steel plate by a user;
step five, welding the main frame: then, a user welds the main body frame of the steel box girder by adopting various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding;
step six, performing primary flaw detection on welding spots and welding seams: after the main frame of the steel box girder is welded, a user uses a flaw detector to perform flaw detection on the positions of welding seams and welding spots of the top plate 1, the outer web 2, the arc-shaped bottom plate 3, the outer middle web 4, the bottom plate 5, the partition plate 6, the inner middle web 7, the inner web 8 and the welding spots, whether the detection is qualified or not is detected, the user removes welding meat after the flaw detection is unqualified, the welding operation is cleaned again, and the flaw detector is used for detecting after the secondary welding is completed until the welding is qualified;
seventhly, welding an auxiliary frame: after the welding flaw detection of the main body frame of the steel box girder is qualified, a user also adopts various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding to weld the steel of the reinforcing rib plate 9 of the auxiliary frame, the vertical rib 10 of the top plate and the vertical rib 11 of the bottom plate;
eighthly, secondary flaw detection of welding spots and welding seams: after the auxiliary frame steel is welded, a user uses a flaw detector to perform flaw detection on the positions of welding seams and welding points of the steel of the reinforcing rib plate 9, the top plate vertical rib 10 and the bottom plate vertical rib 11, whether the detection is qualified or not is detected, after the flaw detection is unqualified, the user removes welding meat, cleans up welding operation again, and uses the flaw detector to detect after secondary welding is completed until the welding is qualified;
ninth, repair welding of the repair section: after the welding flaw detection of the auxiliary frame of the steel box girder is qualified, a user carries out ultrasonic detection and repair on the positions of all welding seams and welding points of the steel by using an ultrasonic detector, and repair welding operation is carried out on the positions of missed welding and wrong welding of the whole steel of the steel box girder;
step ten, performing three-time flaw detection on welding spots and welding seams: after the integral welding of the steel box girder is finished, a user uses the flaw detector again to carry out flaw detection on the integral steel of the steel box girder, the steel box girder can be delivered for use after the positions of the integral welding seam and the welding spot of the steel box girder are all up to standard, the precise selection is carried out on the materials selected through the flow coordination of the steel material selection, the steel material pretreatment, the frame clearance position adjustment, the frame positioning, the main frame welding, the welding spot, the primary flaw detection of the welding seam, the auxiliary frame welding, the welding spot, the secondary flaw detection of the welding seam, the repair section repair welding and the tertiary flaw detection of the welding spot and the welding seam, the integral excellence of the basic steel material is improved, meanwhile, the welding is carried out by adopting the main frame and the auxiliary frame sectional type welding mode, the detection is carried out in time after each stage is finished, the welding quality of each stage is improved, whether the wrong welding and the missing welding phenomenon of the welding spot of the welding seam can be found in time, and the integral welding quality of the steel beam flaw detection box is improved, the stress between the steel plates is eliminated to the greatest extent while the overall welding stability of the steel beam box is enhanced.
In the first steel material selection process, the plate thickness range of the Q345qc steel plate is 18-21mm, the thickness range of the angle joint steel plate at the support of the steel box girder is 23-28mm, the steel plate material size requirements of most of steel box girders with different specifications are met, the yield strength of the main steel of the steel box girder is more than or equal to 400, the tensile strength is more than or equal to 520, the elongation after fracture is more than or equal to 20%, the welding crack sensitivity index is less than or equal to 0.2%, the overall compression resistance, the tensile resistance and the yield resistance of the steel plate material of the steel box girder are improved, and the welding effect among the steel plates is also enhanced.
In the process of adjusting the position of the gap between the three frames, the tolerance ranges of the gap between the main steel of each steel box girder and the auxiliary steel, the alignment position and the welding spot position of the welding seam are between 0.2 +/-0.05 mm and 0.3 +/-0.05 mm, so that the dimensional tolerance error between the main steel of each steel box girder and the auxiliary steel is in a reasonable range, and the influence of overlarge error on the overall welding stability of the steel box girder is avoided.
In the four-frame positioning process, a user positions three positioning horse plates in a three-point distribution manner at the welding positions of main steel and auxiliary steel in advance, the three positioning horse plates form equilateral triangles, isosceles triangles and common triangles according to the position conditions of field steel, the stability is realized according to the triangles, the positioning and fixing effects among the steel plates are enhanced, and the displacement and dislocation in the welding process of the steel plates are avoided.
In the process of welding the five main frames and the seven auxiliary frames, four welding modes of flat welding, vertical welding, overhead welding and transverse welding are adopted for butt welding and diagonal welding of the steel plates, single-side V-shaped grooves are adopted for the top plate 1 and the bottom plate 5, no gaps exist, 4mm truncated edges are reserved, the ceramic liner is pasted on the reverse side, and the welding operation is carried out in a single-side welding and double-side forming mode, the top plate 1 is bottomed by carbon dioxide gas shielded welding, ER50-6 welding wires are selected, the cover surface is filled by submerged arc automatic welding, H10-Mn2 welding wires are selected, the cover surface is directly filled by the bottom plate 5 and other steel products of the main frames by carbon dioxide gas shielded welding, the requirements of the welding modes at different positions are met, the welding effect of the main frames and the auxiliary frames is enhanced to the greatest extent, and the welding precision and quality between the steel plates are improved.
In the process of welding the five main frames and the seven auxiliary frames, the electric welding and the positioning welding of the steel plates are welded by adopting a manual welding gun, the welding rods use E5015, the E5015 welding rods are placed in a drying box in batches for drying and storage before being used, the drying temperature setting interval of the drying box is between 50 and 80 ℃, the voltage range of the welding gun is 25V to 30V, the current is 250A to 300A, the welding operation of a user in a narrow space is facilitated, meanwhile, the user can conveniently weld and fix the steel box girder in advance, and the whole welding stress between the steel plates is eliminated.
In the six welding spots, the primary flaw detection of the welding seam, the eight welding spots, the secondary flaw detection of the welding seam, the ten welding spots and the three flaw detection of the welding seam, before the flaw detector detects, a user cleans splashes, particle impurities, oxide scales, pits, corrosion and the like on the surface of the welding position of a steel plate in advance, the finishing width of the flaw detection surfaces on two sides of the welding seam is between 80 and 120mm, the user comprehensively judges the flaw detection surface according to the shape of a defect wave band on a fluorescent screen of the flaw detector and the height change of a reflected wave, the defect position and the welding mode are combined, the influence of external factors on the detection result of the flaw detector is avoided, the detection accuracy of the flaw detector is improved, and therefore a reasonable and accurate judgment and evaluation basis is provided for the user.
Before the repair welding process of the nine repair sections, a user adopts a manual welding mode to weld the outer side reinforcing steel rod 12 and the inner side reinforcing steel rod 13 between the outer side web plate 2 and the outer side middle web plate 4 and between the inner side web plate 8 and the inner side middle web plate 7 respectively, the effects of stabilizing and reinforcing the outer side web plate 2 and the outer side middle web plate 4 and between the inner side web plate 8 and the inner side middle web plate 7 can be achieved, the overall compression bearing capacity between the outer side web plate 2 and the outer side middle web plate 4 and between the inner side web plate 8 and the inner side middle web plate 7 is improved, the cross steel frame 14 is welded between the outer side middle web plate 4 and the inner side middle web plate 7, the compression resistance between the outer side middle web plate 4 and the inner side middle web plate 7 is improved, and the surface of the outer side middle web plate 4 and the inner side middle web plate 7 is prevented from being subjected to extrusion deformation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A steel box girder construction welding process is characterized in that: the method comprises the following steps:
step one, selecting steel materials: the method comprises the following steps that a Q345qc steel plate is selected in advance by a user to serve as a steel box girder main body, main steel of the steel box girder comprises a top plate (1), an outer side web plate (2), an arc-shaped bottom plate (3), an outer side middle web plate (4), a bottom plate (5), a partition plate (6), an inner side middle web plate (7) and an inner side web plate (8), auxiliary steel plates are made of high-carbon steel, and the auxiliary steel plates comprise reinforcing rib plates (9), top plate vertical ribs (10) and bottom plate vertical ribs (11);
step two, steel pretreatment: then, a user uses a grinding wheel and abrasive paper to grind and clean rust stains and residues on the surfaces of the steel box girder and the auxiliary material steel plate, and particularly the positions of welding seams and welding points of the steel box girder and the auxiliary material steel plate;
step three, adjusting the position of the frame clearance: then, positioning and adjusting gaps, alignment positions and welding spot positions of welding seams between main steel and auxiliary steel of each steel box girder by using the positioning horse plates by a user;
step four, positioning the frame: then, fixing the welding positions of the main steel and the auxiliary steel of the steel box girder by a triangle positioning method by using a special positioning steel plate by a user;
step five, welding the main frame: then, a user welds the main body frame of the steel box girder by adopting various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding;
step six, performing primary flaw detection on welding spots and welding seams: after the main frame of the steel box girder is welded, a user uses a flaw detector to perform flaw detection on welding seams and welding spot positions of the top plate (1), the outer web (2), the arc-shaped bottom plate (3), the outer middle web (4), the bottom plate (5), the partition plate (6), the inner middle web (7) and the inner web (8), and whether the detection is qualified or not is determined;
seventhly, welding an auxiliary frame: after the welding flaw detection of the main body frame of the steel box girder is qualified, a user also adopts various welding modes of carbon dioxide full-automatic shielded welding, submerged arc welding, butt welding and diagonal welding to weld the steel of the reinforcing rib plate (9) of the auxiliary frame, the vertical rib (10) of the top plate and the vertical rib (11) of the bottom plate;
eighthly, secondary flaw detection of welding spots and welding seams: after the auxiliary frame steel is welded, a user uses a flaw detector to perform flaw detection on welding seams and welding spot positions of the steel of the reinforcing rib plate (9), the top plate vertical rib (10) and the bottom plate vertical rib (11), whether the detection is qualified is detected, after the flaw detection is unqualified, the user removes welding meat, cleans up welding operation again, and uses the flaw detector to detect after secondary welding is completed until the welding is qualified;
ninth, repair welding of the repair section: after the welding flaw detection of the auxiliary frame of the steel box girder is qualified, a user carries out ultrasonic detection and repair on the positions of all welding seams and welding points of the steel by using an ultrasonic detector, and repair welding operation is carried out on the positions of missed welding and wrong welding of the whole steel of the steel box girder;
step ten, performing three-time flaw detection on welding spots and welding seams: after the whole welding of steel box girder is accomplished, the user reuses the appearance of detecting a flaw to the whole steel of steel box girder and detects a flaw, treats that whole welding seam of steel box girder, solder joint position are all up to standard after, can deliver and use.
2. The steel box girder construction welding process of claim 1, wherein: in the first step of selecting the steel, the thickness range of the flat plate of the Q345qc steel plate is 18-21mm, the thickness range of the angle joint steel plate at the support of the steel box girder is 23-28mm, the yield strength of the main steel of the steel box girder is more than or equal to 400, the tensile strength is more than or equal to 520, the elongation after fracture is more than or equal to 20%, and the welding crack sensitivity index is less than or equal to 0.2%.
3. The steel box girder construction welding process of claim 1, wherein: in the process of adjusting the position of the gap of the frame in the third step, the tolerance ranges of the gap, the alignment position and the welding spot position of the welding seam between the main steel and the auxiliary steel of each steel box girder are between 0.2 +/-0.05 mm and 0.3 +/-0.05 mm.
4. The steel box girder construction welding process of claim 1, wherein: in the four-frame positioning process, a user positions three positioning horse plates in a three-point distribution manner at the welding positions of the main steel and the auxiliary steel in advance, and the three positioning horse plates form equilateral triangles, isosceles triangles and common triangles according to the position conditions of the field steel.
5. The steel box girder construction welding process of claim 1, wherein: in the process of welding the five main frames and the seven auxiliary frames, four welding modes of flat welding, vertical welding, overhead welding and transverse welding are adopted for butt welding and diagonal welding of the steel plates, single-side V-shaped grooves are adopted for the top plate (1) and the bottom plate (5), no gaps exist, 4mm truncated edges are left, the back surface is pasted with a ceramic liner, and the welding operation is carried out in a single-side welding and double-side forming mode, the top plate (1) is bottomed by adopting carbon dioxide arc welding, ER50-6 welding wires are selected, cover surfaces are automatically welded and filled in a submerged arc mode, H10-Mn2 welding wires are selected, and the cover surfaces are directly filled in the bottom plate (5) and other main frame steel materials by adopting carbon dioxide arc welding.
6. The steel box girder construction welding process of claim 1, wherein: in the welding process of the five main frames and the welding process of the seven auxiliary frames, the electric welding and the positioning welding of the steel plates are welded by adopting a manual welding gun, the welding rod is E5015, the E5015 welding rod is placed in a drying box in batch before being used for drying and storing, the drying temperature setting interval of the drying box is between 50 and 80 ℃, the voltage range of the welding gun is 25V to 30V, and the current is 250A to 300A.
7. The steel box girder construction welding process of claim 1, wherein: in the processes of six welding spots, primary flaw detection of welding seams, eight welding spots, secondary flaw detection of welding seams, ten welding spots and three flaw detection of welding seams, before the flaw detector detects, a user cleans splashes, particle impurities, oxide scales, pits, corrosion and the like on the surface of the welding position of a steel plate in advance, the finishing width of the flaw detection surfaces on two sides of each welding seam is between 80 and 120mm, and the user comprehensively judges the flaw position and the welding mode according to the shape of a flaw wave band and the height change of reflected waves on a fluorescent screen of the flaw detector.
8. The steel box girder construction welding process of claim 1, wherein: before the repair welding process of the nine repair sections in the step, a user respectively welds the outer side reinforcing steel rod (12) and the inner side reinforcing steel rod (13) between the outer side web (2) and the outer side middle web (4) and between the inner side web (8) and the inner side middle web (7) in a manual welding mode, and then welds the cross steel frame (14) between the outer side middle web (4) and the inner side middle web (7).
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