Overturning welding method for large steel box girder

Abstract

The invention discloses a large steel box girder overturning and welding method which comprises a pair of movable type rotating suspension arms, each movable type rotating suspension arm comprises a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate are hinged, the rotating range of the first supporting plate and the second supporting plate is 0-90 degrees, and the other end of the first supporting plate and the other end of the second supporting plate are connected with a first steel wire rope and a second steel wire rope respectively. The section of the large-scale steel box girder is in a box shape, and the welding method comprises the following steps that (1) a pair of adjustable rotating suspension arms are arranged at the two ends of the large-scale steel box girder correspondingly, and two abutted seams on the upper side of the large-scale steel box girder are subjected to flat welding; (2) the second steel wire rope moves upwards to drive the large steel box girder to complete anticlockwise 90-degree overturning; (3) manually adjusting the adjustable rotary suspension arm, and enabling the adjustable rotary suspension arm to clockwise rotate by 90 degrees; and (4) the second steel wire rope moves upwards to drive the large steel box girder to turn over by 180 degrees relative to the step (1), and the other two abutted seams of the large steel box girder are subjected to flat welding. The large steel box girder overturning and welding method is convenient, efficient, time-saving, labor-saving and high in safety.

Description

Technical Field

[0001] The invention relates to the field of steel structure manufacturing, and in particular to a large steel box girder flip welding method. Background Art

[0002] In recent years, large steel structure workpieces have played an increasingly important role in the fields of steel structure buildings, ships, bridges, etc. In particular, large steel box girders have a high load-bearing capacity and can withstand a large amount of gravity load, so they are the most widely used.

[0003] The large steel box girder is welded from four steel plates, and the manufacturing process requires the completion of four welds. When a factory manufactures a large steel box girder, the welding station for the fillet weld is preferably flat welding, so the welding of the weld below the large steel box girder becomes a problem. For example, it is difficult to ensure the welding quality by using overhead welding, and the construction is also difficult. Therefore, in the prior art, the initial assembly of the large steel box girder is mostly completed by spot welding, and then the steel wire rope is wound around the two ends of the large steel box girder, and then the steel wire rope is driven upward by the crane to lift the large steel box girder, and then the large steel box girder is turned over by the workers. The whole process is labor-intensive for the workers, and there are safety hazards, and it is easy to lose the large steel box girder and the crane. For this reason, some other solutions have also been explored in the prior art, such as welding the lifting ring plates at the four corners of the two ends of the large steel box girder, hooking the lifting ring plates with steel wire ropes, and driving the steel wire rope on one side by the crane to move upward, so that the large steel box girder is first turned 90 degrees, and then put down, and then the hook is changed again, and the above operation is repeated until the large steel box girder is turned 180 degrees. The disadvantage of that solution is that the eye plate must be cut off at the end, and a large amount of eye plate is wasted, and the welding and cutting workload is large, which affects the construction efficiency. Summary of the invention

[0004] The purpose of the invention is to provide a large steel box girder flip welding method to solve the problems existing in the prior art.

[0005] The object of the present invention is achieved as follows: a large steel box girder flip welding method, comprising a pair of active rotating booms, the active rotating boom comprising a first support plate and a second support plate, the first support plate and the second support plate are hinged and the rotation range is 0-90 degrees, the other ends of the first support plate and the second support plate are respectively connected to the first steel wire rope and the second steel wire rope, the upper ends of the first steel wire rope and the second steel wire rope are respectively connected to the first crane and the second crane, the large steel box girder cross section is box-shaped, the large steel box girder is arranged on a pier, and the welding method comprises the following steps: (1) A pair of flexible rotating booms are respectively arranged at both ends of the large steel box girder to be assembled by spot welding, so that the first support plate is vertical and the second support plate is horizontal. At this time, the first support plate is in contact with the left side of the large steel box girder, and the bottom of the large steel box girder is located on the second support plate. Then, two joints on the upper side of the large steel box girder are flat welded; (2) The second crane drives the second steel wire rope to move upward until the second pallet is vertical and the first pallet is horizontal. At this time, the large steel box girder completes a 90° counterclockwise flip. Then the first crane and the second crane drive the first steel wire rope and the second steel wire rope to move and place the large steel box girder on the pier. (3) The first crane and the second crane respectively drive the first wire rope and the second wire rope to continue to move downward, and manually adjust the flexible rotating boom to rotate 90° clockwise. At this time, the first support plate is vertical and the second support plate is horizontal; (4) The second crane drives the second steel wire rope to move upward until the second support plate is vertical and the first support plate is horizontal. At this time, the large steel box girder is turned 180 degrees relative to step (1), and the other two joints of the large steel box girder are flat welded.

[0006] The large steel box girder flip welding method can conveniently and efficiently complete the welding of large steel box girders by using a specially designed flexible rotating boom, and is flexible and convenient to use with high safety.

[0007] As a further improvement of the present invention, the lengths of the first support plate and the second support plate are greater than the width and height of the large steel box girder, thereby improving safety in use.

[0008] As a further improvement of the present invention, the other ends of the first support plate and the second support plate are provided with wire rope connection holes to improve the convenience of operation.

[0009] As a further improvement of the present invention, the upper ends of the first steel wire rope and the second steel wire rope are provided with lifting rings to further improve the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the process of the large steel box girder flip welding method of the present invention.

[0011] Among them, 1 is the first support plate, 2 is the second support plate, 3 is the first steel wire rope, 4 is the second steel wire rope, 5 is the large steel box girder, and 6 is the pier. DETAILED DESCRIPTION

[0012] The large steel box girder flip welding method of this embodiment is applied to the welding of a large steel box girder 5 with a box-shaped cross section.

[0013] Specifically, the welding method of the large steel box girder 5 in this embodiment includes a pair of active rotating booms, the active rotating boom includes a first support plate 1 and a second support plate 2, the first support plate 1 and the second support plate 2 are hinged and the rotation range is 0-90°, the other ends of the first support plate 1 and the second support plate 2 are respectively connected to the first steel wire rope 3 and the second steel wire rope 4, the upper ends of the first steel wire rope 3 and the second steel wire rope 4 are respectively connected to the first crane and the second crane, the large steel box girder 5 is set on the pier 6, and the welding method includes the following steps: (1) A pair of flexible rotating booms are respectively arranged at both ends of the large steel box girder 5 to be assembled by spot welding, so that the first support plate 1 is vertical and the second support plate 2 is horizontal. At this time, the first support plate 1 is in contact with the left side of the large steel box girder 5, and the bottom of the large steel box girder 5 is located on the second support plate 2. Then, two joints A / B on the upper side of the large steel box girder 5 are flat welded; (2) The second crane drives the second steel wire rope 4 to move upward until the second pallet 2 is vertical and the first pallet 1 is horizontal. At this time, the large steel box girder 5 completes a 90° counterclockwise flip. Then the first crane and the second crane drive the first steel wire rope 3 and the second steel wire rope 4 to move, and the large steel box girder 5 is placed on the pier 6. (3) The first crane and the second crane respectively drive the first steel wire rope 3 and the second steel wire rope 4 to continue to move downward, and manually adjust the flexible rotating boom. Since the angles of the first support plate 1 and the second support plate 2 are adjustable, the entire flexible rotating boom can be easily rotated 90° clockwise. At this time, the first support plate 1 is vertical and the second support plate 2 is horizontal. (4) The second crane drives the second steel wire rope 4 to move upward until the second support plate 2 is vertical and the first support plate 1 is horizontal. At this time, the large steel box girder 5 is turned 180 degrees relative to step (1), and the other two joints C / D of the large steel box girder 5 are flat welded.

[0014] The large steel box girder flip welding method can conveniently and efficiently complete the welding of the large steel box girder 5 by using a specially designed flexible rotating boom, and is flexible and convenient to use with high safety.

[0015] In order to improve the safety of use and the convenience of operation, the length of the first pallet 1 and the second pallet 2 is greater than the width and height of the large steel box girder 5, the other end of the first pallet 1 and the second pallet 2 is provided with a wire rope connecting hole, and the upper ends of the first wire rope 3 and the second wire rope 4 are provided with a lifting ring.

[0016] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A method for flipping and welding a large steel box girder, comprising a pair of flexible rotating booms, the flexible rotating booms comprising a first support plate and a second support plate, the first support plate and the second support plate being hinged and having a rotation range of 0 to 90 degrees, the other ends of the first support plate and the second support plate being respectively connected to a first steel wire rope and a second steel wire rope, the upper ends of the first steel wire rope and the second steel wire rope being respectively connected to a first crane and a second crane, the large steel box girder having a box-shaped cross section, the large steel box girder being arranged on a pier, characterized in that: The welding method includes the following steps: (1) A pair of flexible rotating booms are respectively arranged at both ends of the large steel box girder to be assembled by spot welding, so that the first support plate is vertical and the second support plate is horizontal. At this time, the first support plate is in contact with the left side of the large steel box girder, and the bottom of the large steel box girder is located on the second support plate. Then, two joints on the upper side of the large steel box girder are flat welded; (2) The second crane drives the second steel wire rope to move upward until the second pallet is vertical and the first pallet is horizontal. At this time, the large steel box girder completes a 90° counterclockwise flip. Then the first crane and the second crane drive the first steel wire rope and the second steel wire rope to move and place the large steel box girder on the pier. (3) The first crane and the second crane respectively drive the first wire rope and the second wire rope to continue to move downward, and manually adjust the flexible rotating boom to rotate 90° clockwise. At this time, the first support plate is vertical and the second support plate is horizontal; (4) The second crane drives the second steel wire rope to move upward until the second support plate is vertical and the first support plate is horizontal. At this time, the large steel box girder is turned 180 degrees relative to step (1), and the other two joints of the large steel box girder are flat welded.

2. The large steel box girder flip welding method according to claim 1 is characterized in that: The lengths of the first support plate and the second support plate are greater than the width and height of the large steel box girder.

3. The large steel box girder flip welding method according to claim 1 is characterized in that: The other ends of the first supporting plate and the second supporting plate are provided with wire rope connecting holes.

4. The large steel box girder flip welding method according to any one of claims 1 to 3, characterized in that: The first steel wire rope and the second steel wire rope have lifting rings at their upper ends.

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