Reinforcing bar, seismic isolation upper foundation structure and footing structure

摘要

PROBLEM TO BE SOLVED: To facilitate the construction of a reinforcing bar, and to provide a seismic isolation upper foundation structure having the reinforcing bar, and a footing structure. A reinforcing bar has a first annular reinforcing bar and at least one U-shaped reinforcing bar joined to the first annular reinforcing bar. At least one U-shaped reinforcing bar is arranged outside the first annular reinforcing bar, one end of which is bent in the direction of the first annular reinforcing bar, and the first annular reinforcing bar on the bent tip side. It is joined to the reinforcing bar of. Further, the reinforcing bar may further have a second annular reinforcing bar in addition to the first annular reinforcing bar, and the first annular reinforcing bar and the second annular reinforcing bar are concentric circles. Arranged in a shape and spaced apart from each other in the longitudinal direction of at least one U-shaped rebar, the at least one U-shaped rebar is a first annular rebar and a second circle. It may be arranged outside the annular reinforcing bar, the other end may be bent in the direction of the second annular reinforcing bar, and the other end may be joined to the second annular reinforcing bar on the bent tip side. [Selection diagram] Fig. 1