BRIDGE CONSTRUCTING METHOD USING EVEN-SECTIONED I-TYPE ROLLED STEEL BEAM HAVING INCREASED SECTION INTENSITY AND I-TYPE ROLLED STEEL BEAM MANUFACTURED WITH UNEVEN STEEL PLATE

摘要

The present invention attaches a high-strength steel sheet to the upper or lower, upper and lower flanges of the rolled steel I-shaped steel beam of the same section while giving the camber to bend the opposite ends in the direction opposite to the working load or introducing the prestress to increase the rigidity. Sectional rolled constant-moulded sectioned steel I-beam and beam-formed steel plate with increased profile or flange width I-type steel beam is simply used, or high strength steel sheet is attached to the upper or lower flange or upper flange Bridge between low height and long distance by constructing bridges by connecting steel beams made of steel edges at the edges of the parental section where rigidity is increased by bending cambers or bending pre-stressed up the opposite end of the load. It is possible to construct and at the same time, it is possible to have lower shape and longer span than when it is installed in the entire section of the bridge by using the rolled steel I-shaped steel of equal section By using high-steel I-beam steel beams, construction cost can be reduced compared to the installation of all sections of the bridge, so it is economical but also has long stiffness and low stiffness. The purpose of the present invention is to provide a bridge construction method using the I-type steel beam and the steel plate of the cross-section.;In order to achieve the above object, the bridge construction method using the rolled steel I-type steel beam and the sectional-shaped steel beam I of the cross-section of the stiffened reinforcement and the cross-sectional stiffness according to the present invention are manufactured in a factory. A rolled steel I type steel beam and an I steel beam manufactured by using a steel sheet, and manufacturing a constant moment portion I type steel beam and a parent moment portion I type steel beam; According to the position of the positive and parent moments generated by the load acting on the pier and the alternator, the positive and parent section I-type steel beams are installed on the pier and the alternating line, where the normal moment is generated. The constant moment having the height and width of the cross section, in which the high strength steel sheet is attached to the lower flange on the tensile side in order to increase the cross-sectional rigidity, and the static moment in the state opposite to the static moment generated when a load is applied to the piers and the alternating shafts. Both sides of the part I-type steel beam are installed with the moment-type I-type steel beam with the camber inclined downward.In the position where the parent moment is generated, the mold height of the part placed on the point is increased but from the center part to both sides. The profile of the wing which extends a certain length is the edge that maintains the existing height for connection with the I moment steel beam of the constant moment part of the same section with the existing height installed in the future. Each step of the installation by the continuous negative moment steel I-section beam; Forming a beam connecting portion interconnecting the positive and non-mental section I-type steel beam, and installing the bridge top plate reinforcement on the beam connecting portion, and placing the concrete in sequence, characterized in that the bridge construction do.;In addition, the parent moment portion I-type steel beam is made of a cross-section steel sheet I-shaped steel beam, the abdominal portion of both ends of the beam is produced in an L-shape for structural connection joint with the constant section portion I-type steel beam And an intermediate flange is installed at the part where the constant moment portion is joined to the lower flange portion of the I-shaped steel beam, and the intermediate flange is formed in the horizontal direction of the L-shape in the horizontal direction of the portion of the parent cemented portion. Characterized in that the extension to the installation.