A large steel box girder overturning welding method

Abstract

The application discloses a large steel box girder overturning welding method, which comprises a pair of active rotary hangers, wherein the active rotary hangers comprise first supporting plates and second supporting plates, the first supporting plates and the second supporting plates are hinged and the rotation range is 0-90 degrees, the other ends of the first supporting plates and the second supporting plates are respectively connected with first steel wires and second steel wires, the cross section of the large steel box girder is in a box shape, and the welding method comprises the following steps: (1) the pair of active rotary hangers are arranged at the two ends of the large steel box girder respectively, and the two upper seams of the large steel box girder are welded horizontally; (2) the second steel wires are moved upwards to drive the large steel box girder to complete 90-degree counterclockwise overturning; (3) the active rotary hangers are manually adjusted to rotate 90 degrees clockwise; and (4) the second steel wires are moved upwards to drive the large steel box girder to complete 180-degree overturning relative to step (1), and the other two seams of the large steel box girder are welded horizontally. The large steel box girder overturning welding method is convenient and efficient, saves time and effort, and is high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of steel structure manufacturing, in particular to a large steel box girder overturning welding method. BACKGROUND

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

[0003] A large steel box girder is made by welding four steel plates together, and four welds need to be welded during the manufacturing process. When a large steel box girder is manufactured in a factory, the fillet weld welding station should be flat welding, so the welding of the weld located below the large steel box girder becomes a problem. If overhead welding is used, on the one hand, it is difficult to ensure the welding quality, and on the other hand, the construction is also difficult. Therefore, in the prior art, the large steel box girder is first preliminarily assembled by spot welding, then steel wire ropes are wound around the two ends of the large steel box girder, then the steel wire ropes are lifted by a crane to lift the large steel box girder, and then the large steel box girder is overturned by workers. The whole process has a large labor intensity of workers and has safety hazards, and the large steel box girder and the crane are easily damaged. For this reason, some other solutions have been explored in the prior art, such as welding a lifting ring plate at the four corners of the two ends of the large steel box girder, hooking the lifting ring plate with a steel wire rope, lifting the steel wire rope on one side by a crane, turning the large steel box girder by 90 degrees, then lowering it, re-hooking, repeating the above operation, and until the large steel box girder is turned by 180 degrees. The disadvantage of that solution is that the lifting ring plate has to be cut off at the end, a large amount of lifting ring plate is wasted, and the welding and cutting workloads are large, which affects the construction efficiency. SUMMARY

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

[0005] The purpose of the present application is achieved by a large steel box girder overturning welding method, which comprises a pair of articulated rotary hoists, the articulated rotary hoists comprising a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate being hinged and having a rotation range of 0-90°, the other end of the first supporting plate and the second supporting plate being connected with a first steel wire rope and a second steel wire rope respectively, the upper end of the first steel wire rope and the second steel wire rope being connected with a first crane and a second crane respectively, the large steel box girder having a box-shaped cross section, the large steel box girder being arranged on a pier, and the welding method comprising the following steps:

[0006] (1) A pair of articulated rotary hangers are arranged at both ends of the large steel box girder assembled by spot welding, so that the first supporting plate is vertical and the second supporting plate is horizontal, at this time the first supporting plate is attached to the left side of the large steel box girder and the bottom of the large steel box girder is located on the second supporting plate, then the two seams on the upper side of the large steel box girder are flat welded;

[0007] (2) The second hoist drives the second steel wire rope to move upwards until the second supporting plate is vertical and the first supporting plate is horizontal, at this time the large steel box girder is completed 90° counterclockwise rotation, then the first hoist and the second hoist drive the first steel wire rope and the second steel wire rope to move, and the large steel box girder is placed on the pier;

[0008] (3) The first hoist and the second hoist drive the first steel wire rope and the second steel wire rope to continue to move downwards, and the articulated rotary hanger is manually adjusted to rotate 90° clockwise, at this time the first supporting plate is vertical and the second supporting plate is horizontal;

[0009] (4) The second hoist drives the second steel wire rope to move upwards until the second supporting plate is vertical and the first supporting plate is horizontal, at this time the large steel box girder is completed 180° rotation relative to step (1), and the other two seams of the large steel box girder are flat welded.

[0010] The large steel box girder overturning and welding method can conveniently and efficiently complete the welding of the large steel box girder by means of the specially designed articulated rotary hanger, and is flexible, convenient and safe to use.

[0011] As a further improvement of the present application, the length of the first supporting plate and the second supporting plate is greater than the width and height of the large steel box girder, improving the safety in use.

[0012] As a further improvement of the present application, the other end of the first supporting plate and the second supporting plate is provided with a steel wire rope connecting hole, improving the operation convenience.

[0013] As a further improvement of the present application, the upper end of the first steel wire rope and the second steel wire rope is provided with a lifting ring, further improving the operation convenience. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The figure is a process schematic diagram of the large steel box girder overturning and welding method of the present application.

[0015] Among them, 1 is the first supporting plate, 2 is the second supporting 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

[0016] The large steel box girder overturning and welding method of the present embodiment is applied to the welding of the large steel box girder 5 with a box-shaped cross section.

[0017] Specifically, the large steel box girder 5 welding method in the embodiment includes a pair of articulated rotary hangers, the articulated rotary hangers include a first supporting plate 1 and a second supporting plate 2, the first supporting plate 1 and the second supporting plate 2 are hinged and the rotation range is 0~90°, the other end of the first supporting plate 1 and the second supporting plate 2 is respectively connected with a first steel wire rope 3 and a second steel wire rope 4, the upper end of the first steel wire rope 3 and the second steel wire rope 4 is respectively connected with a first crane and a second crane, the large steel box girder 5 is arranged on a pier 6, and the welding method includes the following steps:

[0018] (1) A pair of articulated rotary hangers are arranged at the two ends of the large steel box girder 5 assembled by spot welding, so that the first supporting plate 1 is vertical and the second supporting plate 2 is horizontal, at this time, the first supporting plate 1 is attached to 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 supporting plate 2, and then the two seams A / B on the upper side of the large steel box girder 5 are flatly welded;

[0019] (2) The second crane drives the second steel wire rope 4 to move upwards until the second supporting plate 2 is vertical and the first supporting plate 1 is horizontal, at this time, the large steel box girder 5 is completed 90° counterclockwise rotation, 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;

[0020] (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 downwards, and the articulated rotary hangers are manually adjusted, since the angle of the first supporting plate 1 and the second supporting plate 2 is adjustable, the entire articulated rotary hangers can be easily rotated 90° clockwise, at this time, the first supporting plate 1 is vertical and the second supporting plate 2 is horizontal;

[0021] (4) The second crane drives the second steel wire rope 4 to move upwards until the second supporting plate 2 is vertical and the first supporting plate 1 is horizontal, at this time, the large steel box girder 5 is completed 180° rotation relative to step (1), and the other two seams C / D of the large steel box girder 5 are flatly welded.

[0022] The large steel box girder rotation welding method can conveniently and efficiently complete the welding of the large steel box girder 5 by means of the specially designed articulated rotary hangers, and is flexible, convenient and safe to use.

[0023] In order to improve the use safety and operation convenience, the length of the first supporting plate 1 and the second supporting plate 2 is greater than the width and height of the large steel box girder 5, the other end of the first supporting plate 1 and the second supporting plate 2 is provided with a steel wire rope connecting hole, and the upper end of the first steel wire rope 3 and the second steel wire rope 4 is provided with a lifting ring.

[0024] The present application is not limited to the above-mentioned embodiments, and on the basis of the technical solutions disclosed in the present application, those skilled in the art can make some substitutions and modifications to some technical features without creative labor according to the disclosed technical content, and these substitutions and modifications are all within the protection scope of the present application.

Claims

1. A large steel box girder overturning welding method, comprising a pair of articulated rotary jibs, the articulated rotary jibs 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 0-90°, the other end of the first support plate and the second support plate being connected with a first steel wire rope and a second steel wire rope respectively, the upper end of the first steel wire rope and the second steel wire rope being connected with a first crane and a second crane respectively, the large steel box girder having a box-shaped cross section, the large steel box girder being arranged on a pier block, characterized in that, The welding method comprises the following steps: (1) a pair of live-type rotary hangers are arranged at two ends of a large steel box girder to be assembled by spot welding, so that the first supporting plate is vertical and the second supporting plate is horizontal, at this time the first supporting plate is attached to the left side of the large steel box girder and the bottom of the large steel box girder is located on the second supporting plate, then the two seams on the upper side of the large steel box girder are flatly welded; (2) the second crane drives the second steel wire rope to move upward until the second supporting plate is vertical and the first supporting plate is horizontal, at this time the large steel box girder is completed to be turned over by 90° counterclockwise, then the first crane and the second crane drive the first steel wire rope and the second steel wire rope to move, and the large steel box girder is placed on the pier; (3) the first crane and the second crane continue to drive the first steel wire rope and the second steel wire rope to move downward respectively, and the live-type rotary hanger is manually adjusted to be rotated by 90° clockwise, at this time the first supporting plate is vertical and the second supporting plate is horizontal; (4) the second crane drives the second steel wire rope to move upward until the second supporting plate is vertical and the first supporting plate is horizontal, at this time the large steel box girder is completed to be turned over by 180° relative to step (1), and the other two seams of the large steel box girder are flatly welded.

2. The method of claim 1, wherein: The length of the first supporting plate and the second supporting plate is greater than the width and the height of the large steel box girder.

3. The method of claim 1, wherein: The other end of the first supporting plate and the second supporting plate is provided with a steel wire rope connecting hole.

4. The method according to any one of claims 1-3, wherein: The upper end of the first steel wire rope and the second steel wire rope is provided with a lifting ring.

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