| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple plate structure capable of further reliably preventing large deformation when thermally expanding by being heated, by normally providing practically sufficient rigidity.SOLUTION: Respective parts of an inner panel 13 are swollen toward an outer panel 14 side, and a plurality of main and sub swelling parts 17, 17' and 18 of a regular tetragonal pyramid shape of being mutually the same shape and the same size on at least respective base end parts, are respectively formed, and the swelling parts 17, 17' and 18 are vertically, horizontally, regularly and continuously arranged in the plane direction. When viewing a part 13a in the plane direction of the inner panel 13, the part 13a is formed so as to have a main swelling part 17 for constituting its central part and six sub-swelling parts continuously arranged around the main swelling part 17. A through-hole 20 is formed on the respective base sides of two second triangular plates for sandwiching respective first triangular plates directly continuously arranged in the main swelling part 17 among six triangular plates for respectively constituting the respective sub-swelling parts. |
