| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite board which can secure sufficient fixing strength, and can effectively suppress an influence of an air pressure change in a tubular body.SOLUTION: A composite board 1 is formed of a plurality of tubular bodies 2 which are arranged vertically with respect to the longitudinal direction, connecting members 3 for connecting a plurality of the tubular bodies 2 to one another, and two plate materials 4a, 4b which sandwich a plurality of the connected tubular bodies 2 from the longitudinal direction. Notches 22 are formed at the tubular bodies 2, the connecting members 3 are fit into the notches 22, thereby the adjacent tow tubular bodies 2 are connected to each other, and ventilation holes are formed in the notches 22 in a state that the connecting member 3 are fit into the notches 22. |
