ABSTRACT
Aging of bridges is a common issue in the world. Bridges are one of important social infrastructures that is indispensable for living and industry, it is necessary for us to solve the problem of aging of Bridges. About 720,000 road bridges have been constructed in Japan, many of which are managed by local governments. Bridges managed by them are almost small bridges with narrow widths and short lengths. As structures for short bridges, two types are used: bridge type and box culvert type. Box culvert without the joints is effective in easing deterioration and simplifying inspection work. In addition, the precast box culvert, which is manufactured in advance at the factory, is excellent in that the material quality can be ensured and the construction period can be shortened. It is suitable for constructions with limited traffic restrictions and in winter of cold regions. In this paper, the comparison and discussion for two types are described.
