| 摘要 |
The present invention relates to a girder for a temporary structure, which is used for a predetermined period, like a temporary bridge or a temporary support, and is removed after achieving objectives, and more particularly to a girder for a temporary structure where prestress is introduced in a main girder by the cooling contraction of a reinforcing member where temperature distribution is introduced and a manufacturing method thereof. According to an embodiment of the present invention, the girder for a temporary structure where temperature prestress is introduced comprises: a main girder; a first fixing member parallel to the longitudinal direction of the main girder, which is attached to one end of the lower part of the main girder; a second fixing member parallel to the longitudinal direction of the main girder, which is attached to the other end of the lower part of the main girder; a middle supporter, which is attached to the lower part of the center of the main girder to be symmetrical to the axis of a web and is higher than the first and second fixing members; a first reinforcing member, which is pinned to the first fixing member in one end and is expanded in the other end by heating to be pinned to the middle supporter, and which includes length materials with an H-shaped cross section; and a second reinforcing member, which is pinned to the second fixing member in one end and is expanded in the other end by heating to be pinned to the middle supporter, and which includes length materials with an H-shaped cross section. The prestress is introduced to the main girder by the cooling contraction of the first and second reinforcing members. |
