Turning method and turning device for manufacturing steel box girders

摘要

The present invention relates to a turning method and a turning device for manufacturing a steel box girder (Steel Box Girder) used as a construction member, such as high prices, bridges.;As is well known, the process of fillet-welding the joints of the box beams welded during the manufacturing process of the forced box beams is always required to weld only in the downward position in order to prevent the decrease in strength due to welding defects. It is necessary to turn to realign the welding table by turning it 90 degrees to correspond to the posture of the welding step by step, but Boxbo was a very difficult problem because the turning work was a huge volume of heavy materials. . In order to solve this problem, in the related art, a chain block device is installed on two or more cranes on one side of a workbench, the both ends of the box beams are rolled up with chains, and the chain is rotated to rotate the box beams by about 90 degrees. However, this turning work requires a lot of work such as winding and unwinding the chain by hand, and the chain breaks both edges of the box beam, and the turning and incomplete coordination between both sides of the chain are of high quality. It was difficult to manage, low productivity, not automated, and took up a lot of installation space and workspace.;The present invention solves the problems of the conventional turning method, lowering the occupation of the workplace by configuring the entire turning device built in the basement, and is operated by a hydraulic device to the turning device to support the bottom and side ends of the box beam rear It is equipped with a position-type box support means for rotating 90 degrees by rotating the turning operation safely, quickly, collectively and easily, without damaging the appearance of the beam, to automate the turning operation The present invention provides a turning method and a turning device that can significantly improve quality controllability.