| 摘要 |
A laminated material relatively large in thickness and having a curved surface of small radius, wherein a laminated material ( 170 ) as a raw material is provided in which surface plates ( 181, 182 ) are fixed to both surfaces of a core material ( 183 ) and the surface plate ( 181 ) on the internal side of an arc is not fixed to the core material ( 183 ) and, with one end side of the laminated material ( 170 ) fixed to frames ( 30, 40 ), the other end of the surface plate ( 181 ) is moved in the direction apart from the core material ( 183 ) so as to bend it in arc-shape, the other end being not fixed to the core material ( 183 ).
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