- Reinforcement Structure for Support Part of Steel Bridge I-Girder

摘要

The present invention relates to the point reinforcement structure of the I-type steel girder of the road bridge, specifically, the width of the lower flange of the I-type steel girder more than the width of the reinforcement plate for reinforcing the point of the I-type steel girder. By increasing the size, the reinforcement structure of the point of the I-type steel girder of the road bridge to extend the fatigue life of the I-type steel girder by making it possible to obtain a stable welding pattern without the overlapping phenomenon when welding the reinforcement plate. It is about.;The reinforcement structure of the point portion of the I-type steel girder of the road bridge according to the present invention, by reinforcing the point portion by applying a reinforcing plate 20 to the lower portion of the lower flange 120 of the point portion of the I-type steel girder, On both sides of the lower flange 120 of the branch portion, an expansion flange portion 122 is formed which extends outwardly larger than the reinforcement plate 20, and the reinforcement plate 20 padded on the lower portion of the lower flange 120 of the branch portion. It is characterized in that it has a structure that is fixed by welding the circumference of the expansion flange portion 120.;According to the present invention, since the reinforcement plate is added to the lower portion of the lower flange for the reinforcement of the branch portion is welded under the expansion flange portion, not only has a cross-sectional structure advantageous for improving the rigidity of the branch portion, the width of the reinforcement plate is lower It is possible to obtain a more stable welding pattern by preventing the wrap around weld shape generated when the flange is larger than the flange. In addition, since the welding pattern is prevented from being formed directly on the side end of the lower flange constituting the main skeleton of the I-type steel girder, direct welding damage or notches are prevented from occurring at the side end and the web end of the lower flange. It is possible to achieve a strong point structure.