抄録
The Y-shaped lumbers of chestnut trees from the Jomon period about 4000 years ago were excavated at the Sakuramachi site in Oyabe City, Toyama, Japan in 1997. The usage of Y-shaped lumbers at this site has not yet been clarified. A field survey of the Y-shaped lumbers of the Sakuramachi site was performed and structural characteristics of the Y-shaped lumbers were investigated by the author Ozawa et al. A lot of usages of Y-shaped lumbers at the Sakuramachi site had been collected in the home page of Oyabe City. In this paper, the usage for its validity of Y-shaped lumbers at the Sakuramachi site is discussed from a viewpoint of the existence of the necessity of structural characteristics of the Y-shaped lumbers.
