| 摘要 |
PROBLEM TO BE SOLVED: To provide a nail capable of certainly being driven into a wood material and enhancing a work efficiency and a joining structure and a joining method using this nail. SOLUTION: The nail 10 comprises an end sharp portion 12 formed on a lower end portion, a head portion 13 formed on an upper end portion and a shaft portion 14 formed between the end sharp portion 12 and the head portion 13. Convex and concave portions are formed by providing a plurality of annular projections 15, 15... along a circumferential direction on a surface of a lower portion of the above shaft portion 14 such that a drawing resistance is enhanced. An upper surface than a portion in which the convex and concave portions of the above shaft portion 14 are formed is almost smoothly formed. A joining structure and a joining method using the nail 10 are provided.
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