| 摘要 |
PROBLEM TO BE SOLVED: To easily increase a length or a width by connecting a plurality of timbers by a sufficient strength without impairing characteristics of a natural feeling, an aesthetic sense and the like which are peculiar to the timber. SOLUTION: Edge faces of two sets of superimposed timbers are fitted in a projected and recessed state to each other, a bolt is respectively passed through bolt holes to be concreted at each position or a plurality of positions passing through each of a recessed and projected part wherein two sets of timbers are superimposed with alternately, a part wherein one side set of timbers are superimposed, and a part wherein the other side set of timbers are superimposed, and the timbers are connected.
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