Steel single-box type (1-cell box girder)

摘要

The steel single-box type ramen type walkway overpass of this invention is a structure type that is more economical and aesthetically pleasing because it greatly reduces the cross-section of the girder-shaped beam and forms a curved section and a straight section. In addition, the steel single-box type raft type bridge overpass structure of the present invention has excellent usability for sagging and provides a simple construction method that can control the contraction and expansion amount due to the temperature difference in the connection between the column and the beam. In addition, it provides advantageous methods in terms of material side and construction rather than the existing double-barrel type ramen structure.;The construction procedure according to the present invention is as follows: a steel column is fixed on the foundation, a single-box steel beam made of curved and straight sections is mounted on the column, and the sagging at the center is adjusted to a temporary column In the state, the column and beam are welded in the field, and the temporary column is demolished to complete the structural form. In this case, the position of the stiffened beam on the steel column is designed by reinforcing the steel beam so as to allow an error that can be varied by about 1 cm according to the shrinkage and expansion due to the temperature. It greatly improves the economic efficiency by designing.