CN115338601B - Preparation method of girder with triangular structure - Google Patents
Preparation method of girder with triangular structure Download PDFInfo
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- CN115338601B CN115338601B CN202211016767.4A CN202211016767A CN115338601B CN 115338601 B CN115338601 B CN 115338601B CN 202211016767 A CN202211016767 A CN 202211016767A CN 115338601 B CN115338601 B CN 115338601B
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- wing plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
Abstract
The invention discloses a preparation method of a girder with a triangular structure, which comprises the following six aspects: in the first aspect, the lower chord structure is manufactured by dividing the lower chord structure into three sections of box bodies, and the left side and the right side of each section of box body are manufactured in a combined way; in a second aspect, chamfering a welded area of a steel gasket, increasing a thickness of the steel gasket, and chamfering a root of the steel gasket; in the third aspect, a boss is added on an upper wing plate of the lower chord structure; in the fourth aspect, the root of the straight web is reversely inclined, and a groove with an asymmetric inclined plane is formed; in a fifth aspect, changing an assembly order of the lower chord structure; in a sixth aspect, the welding sequence of the lower chord structure is changed. The invention solves the problems of difficult size control and weld penetration in the prior art.
Description
Technical Field
The invention relates to a crane steel structure manufacturing technology, in particular to a preparation method of a triangular girder.
Background
Because a part of user wharfs are closer to an airport, strict height limiting requirements are provided for equipment on the wharfs in order not to influence navigation of an airplane, but along with large development of ships, the large-scale requirements for a shore container crane are continuously increased, so that a large-scale low-attitude telescopic truss girder shore bridge is generated, and the type of shore bridge can meet the height limiting requirements and can also meet the requirements for loading and unloading large ship containers. The girder is fixed on the door frame through the upper cross beam and the suspension system, and is pulled by the traction steel wire rope to perform telescopic motion in the sea-land side suspension system so as to meet the functions of user wharf operation and avoiding ship berthing, and in order to ensure the stability of the girder during telescopic motion, the door frame adopts a large-slope structural form (the upper opening of the door frame is about 16 meters compared with the track gauge).
As shown in fig. 1 to 3, the girder of the shore container crane in this form adopts a truss structure, and is composed of an upper chord structure 1, a lower chord structure 2, web members 3, an upper layer stay 4, a transverse stay 5 and the like, a trolley track 6 is arranged on an upper wing plate of the lower chord structure 2, and a lower sliding track 7 of the sliding girder is arranged at the bottom of a lower wing plate of the lower chord structure 2.
The overall length of the truss girder structure is about 120m, the height of the cross section is about 8m, and the width is about 8m. When the girder is manufactured, an upper chord section, a lower chord section, a web member, a transverse brace rod, an upper brace rod and the like are manufactured respectively, the upper chord and the lower chord are spliced into a whole length and then are spliced with the web member into a side piece assembly, and finally the side piece assembly is spliced after being erected, and the transverse brace rod, the upper brace rod and the like are installed.
The lower chord structure 2 is arranged at the lower part of the cross section of the girder, is a triangular box body at the left side and the right side, has the length of about 120m, is a narrow sealing space inside, and is characterized in that the welding seam between the inclined web 8 and the lower wing plate is a full penetration welding seam 9 of a whole strip steel gasket, the welding seam between the inclined web 8 at the web part and the upper wing plate is a full penetration welding seam 9 of the steel gasket, and the welding seam between the web plate supporting the trolley track 6 and the upper wing plate is a penetration welding seam 9.
The girder structure is E-level fatigue grade project, and the lower chord structure of the girder is provided with an integral sliding rail and a trolley running rail for supporting the girder to stretch out and draw back, so that the precision control of the lower chord structure manufacturing and the quality requirement of a forming welding seam are very high, meanwhile, the lower chord structure steel plate is an FCM plate, all the assembly and the like can be only spot-welded in a structure groove, and spot welding is not allowed on the structure.
In view of the small cross section of the lower chord box body, the single manufacture is not beneficial to controlling the torsion degree and straightness of the box body and the deviation of the external dimensions of the left box body and the right box body, and the repair of the penetration weld joint of the steel gasket has great influence on the transverse and longitudinal level of the bearing rail beam surface.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a girder with a triangular structure, which aims to solve the problems of difficult dimension control and weld penetration in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the girder with the triangular structure comprises the following six aspects:
in the first aspect, the lower chord structure is manufactured by dividing the lower chord structure into three sections of box bodies, and the left side and the right side of each section of box body are manufactured in a combined way;
in a second aspect, chamfering a welded area of a steel gasket, increasing a thickness of the steel gasket, and chamfering a root of the steel gasket;
in the third aspect, a boss is added on an upper wing plate of the lower chord structure;
in the fourth aspect, the root of the straight web is reversely inclined, and a groove with an asymmetric inclined plane is formed;
in a fifth aspect, changing an assembly order of the lower chord structure;
in a sixth aspect, the welding sequence of the lower chord structure is changed.
Preferably, in the first aspect, the width of the upper wing plate of the combined blanking of each section of the box body is widened;
wherein, the width of the upper wing plate of the first box body of the segmentation and the third box body of the segmentation widens 100+ -1 mm, and the width of the upper wing plate of the second box body of the segmentation widens 200+ -1 mm.
Preferably, in the second aspect, the chamfer on the steel gasket has a specification of 5×5mm;
the thickness of the steel gasket is increased to 10 + -0.5 mm.
Preferably, in the third aspect, the boss is disposed at a splice joint position, a lifting lug position and a welding process support position of the upper wing plate and the lower wing plate of the lower chord structure.
Preferably, in the fourth aspect, the width of the back-inclined force on the straight web is 12±0.5mm;
the angles of the grooves are 45 degrees;
the bevel with small bevel is positioned at one side of the triangular box body.
Preferably, in the fifth aspect, the assembly sequence of the lower chord structure is specifically as follows:
a) The lower wing plate of the lower chord structure and the inclined web plate are subjected to three-side forming;
b) Before the straight web is assembled, the welding seam of the welding root of the inclined web pad on the side of the bearing rail beam is primed for 1-2 times;
c) And after the straight web plate is installed, welding a welding seam of the box body.
Preferably, in the sixth aspect, the welding sequence of the lower chord structure is specifically as follows:
1) A vertical welding seam is formed between the outer partition plate and the web plate;
2) A weld joint between the outer partition plate and the upper wing plate;
3) The bevel weld with small inclined plane;
4) A weld joint between the straight web side inclined web and the upper wing plate;
5) A weld joint between the outer inclined web plate and the upper wing plate;
6) After primary turning, backing 1-2 times of welding seams between the inclined web plate and the lower wing plate, and correcting the reverse deformation of the angle joint of the inclined web plate and the lower wing plate after secondary turning;
7) Finishing welding seams between the partition plate and the lower wing plate after three times of turning over;
8) A weld joint between the inclined web and the lower wing plate at the side of the straight web;
9) A welding seam between the inclined web plate and the lower wing plate at the outer side;
10 The bevel weld with a large carbon planing inclined surface is welded in place after correction of the reverse deformation.
The preparation method of the girder with the triangular structure, provided by the invention, can better control the size of the box body, improve the qualification rate of the penetration weld, meet the quality requirement of product operation, and solve the problems of difficult size control and penetration weld in the prior art.
Drawings
FIG. 1 is a schematic illustration of a prior art shoreside container crane girder;
FIG. 2 is a schematic cross-sectional view of the shoreside container crane girder of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the lower chord structure of FIG. 1;
FIG. 4 is a schematic view of the first aspect of the present invention divided into three sections, wherein (a) is a schematic view of the first section, (b) is a schematic view of the second section, and (c) is a schematic view of the third section;
FIG. 5 is a schematic view of the widening of the third-stage tank in the first aspect of the preparation method of the present invention, wherein (a) is a schematic view of the first/third stage, and (b) is a schematic view of the second stage;
FIG. 6 is a schematic view of a second aspect of the steel gasket in the manufacturing method of the present invention, wherein (a) is a schematic view of chamfering the steel gasket and (b) is a schematic view of assembling the steel gasket;
FIG. 7 is a schematic view of boss locations of a third aspect of the method of making the present invention;
FIG. 8 is a schematic view of a fourth aspect of the present invention, wherein (a) is a schematic view of a straight web arrangement and (b) is a schematic view of a straight web assembly;
FIG. 9 is a schematic diagram of the assembly sequence of the lower chord structure of the fifth aspect of the preparation method according to the present invention, wherein (a) is a schematic diagram of the sequence A), and (b) is a schematic diagram of the sequence C);
FIG. 10 is a schematic view of a welding sequence of a lower chord structure in a sixth aspect of the manufacturing method of the present invention, wherein (a) is a schematic view of sequences 1) to 5), (b) is a schematic view of sequence 6), and (c) is a schematic view of sequences 6) to 10);
FIG. 11 is a schematic illustration of a low profile truss girder after use of the method of the present invention;
fig. 12 is a schematic view in the direction A-A of fig. 11.
Detailed Description
In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The invention provides a preparation method of a girder with a triangular structure, which comprises the following six aspects:
in the first aspect, the lower chord structure is manufactured by three sections of boxes (a first section of box 101, a second section of box 102 and a third section of box 103), and the left side and the right side of each section of box are manufactured in a combined way so as to control the box size, the box torsion degree, the structural straightness and the like of the left side and the right side, as shown in fig. 4; meanwhile, in order to increase the construction space, the widths w1 of the upper wing plates of the first-stage tank 101 and the third-stage tank 103 are widened by 100+ -1 mm, and the widths w2 of the upper wing plates of the second-stage tank 102 are widened by 200+ -1 mm, as shown in fig. 5.
In the second aspect, the thickness of the steel gasket 9 is increased from 6mm which is conventional to 10+/-0.5 mm, so that chamfer 901 is convenient to process on one hand, and the phenomenon that the steel gasket 9 is planed through during repairing is prevented on the other hand. And processing a chamfer 901 in a welding area of the steel gasket 9, wherein the specification of the chamfer 901 is 5 x 5mm, then assembling the chamfer with a web, and performing backing welding 902 on a position formed by a blunt edge of the web to ensure that the penetration depth of a penetration weld exceeds the thickness of a base material, so that the base material has no defects in the thickness. Meanwhile, the positioning size control and the assembly quality of the assembly of the steel gasket 9 are enhanced, and the gap between the steel gasket 9 and the wing plate is ensured to completely meet the requirements of welding technological regulations. By opening the oblique potential at the root of the steel gasket 9, the bottoming weld with the defects easily appearing is outside the thickness of the base metal, and the quality control in the construction process is combined, so that the quality of the weld within the thickness range of the base metal is effectively ensured, and the problem that the defects at the root of the steel gasket weld cannot be eliminated for many years is solved, as shown in fig. 6.
In the third aspect, spot welding is strictly forbidden in a non-welding area of the truss girder, a steel plate clamp is not required to be used for lifting in a turning mode, a boss is added on an upper wing plate of a lower chord structure, and the boss is arranged at a jointed seam position 10, a lifting lug position 11 and a welding process supporting position of a jointed plate of the upper wing plate and the lower wing plate of the lower chord structure, so that the requirement that welding seams are not welded on a base metal is met, as shown in fig. 7.
In the fourth aspect, in order to reduce the deformation influence of penetration weld on the rail surface of the trolley track rail, the thickness t=24 mm of the straight web 12 on the rail beam, the root of the straight web 12 is reversely inclined to reduce the welding amount, the width t1 of the reversely inclined is 12±0.5mm, meanwhile, the grooves of the asymmetric inclined planes are formed, the angle α of the grooves is 45 °, the small groove side 13 is assembled on the triangular box side, the welding amount of the narrow space side is reduced, after the welding of the small groove side 13 is completed, the welding of the large groove side 14 is performed by carbon planing, and the reverse deformation is corrected and then the welding is performed in place, so that the flatness of the rail beam surface 15 is better controlled, as shown in fig. 8.
In a fifth aspect, the lower chord structure is in a triangle box structure form, and the outer side of the triangle box is welded with the rail bearing beam web of the trolley rail, so that the welding space is limited due to the relatively smaller structure, more CJP welding seams exist, the construction difficulty is extremely high, particularly, the inclined web full penetration welding seams on the rail bearing beam side are difficult to control, and the root welding defects are difficult to control, so that the assembly sequence of the lower chord structure is changed, and the method is as follows:
a) The lower wing plate of the lower chord structure is formed with the inclined web 16 in three sides, see the x position in fig. 9 (a);
b) Before the straight web plates are assembled, backing 1-2 times of welding seams at the root parts of the backing welds of the inclined web plates 16 at the side of the rail bearing beam so as to improve the primary qualification rate of the welding seams;
c) After the straight web is installed, the box welds are welded, see y-position in fig. 9 (b).
In a sixth aspect, in order to reduce deformation of the case, multiple turn-over multi-pass welding is adopted, and a specific welding sequence is as follows:
1) A vertical weld joint between the outer separator and the web, see position a in fig. 10 (a);
2) The weld between the outer separator and the upper wing, see position B in fig. 10 (a);
3) Bevel welds with small bevels, see position C in fig. 10 (a);
4) The weld between the straight web side inclined web and the upper wing plate, see position D in fig. 10 (a);
5) The weld between the outboard canted web and the upper wing panel, see E in fig. 10 (a);
6) After primary turning, a weld joint between the inclined web plate and the lower wing plate is bottomed for 1-2 times, and after secondary turning, the angle joint between the inclined web plate and the lower wing plate is corrected to be deformed reversely, and the F position in the figure 10 (b) is shown;
7) Finishing welding lines between the partition plate and the lower wing plate after three times of turning over, wherein the G position in the figure 10 (c) is shown;
8) The weld joint between the straight web side inclined web and the lower wing plate is shown in the H position in the figure 10 (c);
9) The weld between the outboard canted web and the lower wing panel, see position I in fig. 10 (c);
10 Large bevel weld with carbon planed, correct for reverse deformation and weld in place, see J in fig. 10 (c).
Examples
The steps for preparing the low-attitude truss girder in the embodiment are as follows:
1) Part lofting and numerical control blanking:
the triangular box body with the lower chord structure is manufactured by dividing the triangular box body into three sections, upper wing plates are combined and fed (the width of a first box body 101 and a third box body 103 is divided into +100, the width of a second box body 102 is divided into +200), web plates are combined and fed (the width allowance is 30 x 2), the length of the web plates is allowance (100 mm on the most sea side and the most land side respectively, the butt joint port of each section is 50mm, and the allowance of each section part of the lower chord is arch value +shrinkage allowance is 1.5 mm/m=2.3 x L); and bosses 20 x 60 on two sides of the joint position are arranged, and a single-side boss 20 x 180 is arranged at the position of the turning lifting lug.
2) The web wing plates of the lower chord section are spliced, the arc striking and extinguishing plates of the upper wing plate and the lower wing plate are arranged at the boss positions, the inclined web plate is cut off after finishing scribing, a groove is formed, and the spliced plates are butted after the groove is processed on the straight web plate of the rail bearing beam.
3) And drawing an assembly line of an inclined web plate, a straight web plate and a central inspection line on the upper wing plate and the lower wing plate, drawing a partition plate assembly line on the inclined web plate, and drawing a scribing notch between the partition plates to be 1250+3 mm.
4) Chamfer 5*5 was machined from steel plate-10 x 50 as a steel backing, then assembled to a beveled web, and the site where the blunt edge of the web was formed was primed and inspected for MT100% flaw detection.
5) And (5) building a horizontal jig frame in a workshop, and detecting to be qualified.
6) The lower wing panel is placed on the horizontal jig frame and secured with the clip Ma Guding.
7) And forming three sides of the triangular box body, installing a bevel web process plate for 3 m/gear, then utilizing the support of the process plate and a chain block to adjust the angle, assembling and positioning the bevel web, ensuring the fit between the bevel web gasket and the lower wing plate, and prohibiting spot welding between the process plate and the bevel web.
8) And a partition plate is arranged between the two inclined webs, so that the center of the partition plate is aligned with the center of the lower wing plate, namely, the center of the inclined web is aligned with the center of the lower wing plate.
9) And (5) finishing the vertical welding seam of the partition board.
10 The upper wing plate is arranged on the horizontal jig frame and is firmly clamped Ma Guding, the three-face formed triangular box body is turned over, integrally assembled and positioned on the upper wing plate, and the fit between the inclined web plate liner and the upper wing plate is ensured.
11 A partition plate outside the positioning triangular box body is assembled.
12 In order to better ensure the full penetration weld of the inclined web plate on the side of the rail bearing beam, the rail bearing beam is firstly primed, and then the straight web plate of the rail bearing beam is installed, and the small groove of the straight web plate faces the triangular box body side.
13 Welding, turning over and the like according to the welding sequence, symmetrically and sectionally skipping welding from the middle to the two ends during welding, adopting multiple welding, and preheating before welding.
14 Correcting the transverse and longitudinal flatness of the upper wing plate and the lower wing plate.
15 The lower chord is split into two parts. And drilling a through hole phi 6 (3 m/grade) before splitting, taking the through hole as a reference and a flame starting point, adopting a semi-automatic cutter to break from the center to the two sides, keeping 50mm for every 3m without cutting, and keeping 60mm at the two ends respectively. In order to reduce deformation, each section is cut and cooled, then the next section is cut, and the rest is cut completely after the whole section is cooled.
16 The free edge allowance of the upper wing plate is trimmed by scribing, and the straightness, the distortion and the flatness of the upper wing plate of the lower chord triangle box body are integrally corrected.
17 Measuring the length of the lower chord segment, trimming the segment port size, and adjusting the butt joint to be integral as shown in fig. 11 and 12.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (4)
1. The preparation method of the girder with the triangular structure is characterized by comprising the following six aspects:
in the first aspect, the lower chord structure is manufactured by dividing the lower chord structure into three sections of box bodies, and the left side and the right side of each section of box body are manufactured in a combined way;
in a second aspect, chamfering a welded area of a steel gasket, increasing a thickness of the steel gasket, and chamfering a root of the steel gasket;
in the third aspect, a boss is added on an upper wing plate of the lower chord structure;
in the fourth aspect, the root of the straight web is reversely inclined, and a groove with an asymmetric inclined plane is formed;
the width of the inverted slope on the straight web is 12+/-0.5 mm;
the angles of the grooves are 45 degrees;
the bevel with small bevel of the straight web is positioned at one side of the triangular box body,
in a fifth aspect, the assembly sequence of the lower chord structure is changed, specifically as follows:
a) The lower wing plate of the lower chord structure and the inclined web plate are subjected to three-side forming;
b) Before the straight web is assembled, the welding seam of the welding root of the inclined web pad on the side of the bearing rail beam is primed for 1-2 times;
c) After the straight web plate is installed, welding a welding line of the box body;
in a sixth aspect, the welding sequence of the lower chord structure is changed, specifically as follows:
1) A vertical welding seam is formed between the outer partition plate and the web plate;
2) A weld joint between the outer partition plate and the upper wing plate;
3) The groove weld joint with a small straight web inclined plane;
4) A weld joint between the straight web side inclined web and the upper wing plate;
5) A welding seam between the inclined web plate and the upper wing plate at the outer side;
6) After primary turning, backing 1-2 times of welding seams between the inclined web plate and the lower wing plate, and correcting the reverse deformation of the angle joint of the inclined web plate and the lower wing plate after secondary turning;
7) Finishing welding seams between the outer partition plate and the lower wing plate after three times of turning over;
8) A weld joint between the inclined web and the lower wing plate at the side of the straight web;
9) A welding seam between the inclined web plate and the lower wing plate at the outer side;
10 The groove welding seam with a large straight web carbon planing inclined plane is welded in place after correction of the reverse deformation.
2. The method for manufacturing the triangular structure girder according to claim 1, wherein: in the first aspect, the width of an upper wing plate of each section of box body combined blanking is widened;
wherein, the width of the upper wing plate of the first box body of the segmentation and the third box body of the segmentation widens 100+ -1 mm, and the width of the upper wing plate of the second box body of the segmentation widens 200+ -1 mm.
3. The method for manufacturing the triangular structure girder according to claim 1, wherein: in the second aspect, the chamfer on the steel gasket has a gauge of 5 x 5mm;
the thickness of the steel gasket is increased to 10 + -0.5 mm.
4. The method for manufacturing the triangular structure girder according to claim 1, wherein: in the third aspect, the boss is arranged at a jointed seam position of the jointed board of the upper wing plate and the lower wing plate of the lower chord structure, a lifting lug position and a welding process support position.
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| CN202211016767.4A CN115338601B (en) | 2022-08-24 | 2022-08-24 | Preparation method of girder with triangular structure |
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| CN202211016767.4A CN115338601B (en) | 2022-08-24 | 2022-08-24 | Preparation method of girder with triangular structure |
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| CN115338601B true CN115338601B (en) | 2023-09-26 |
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| US11536030B2 (en) * | 2022-03-24 | 2022-12-27 | B&H Solutions LLC | Composite open web beam-joist and method of manufacture |
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| CN106112223A (en) * | 2016-07-18 | 2016-11-16 | 中建钢构有限公司 | A kind of T connector submerged welding process |
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| CN115338601A (en) | 2022-11-15 |
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