| 摘要 |
<p>The present invention addresses the problem of preventing caving-in of synthetic resin sheets (8, 10) in a hollow structure in which both surfaces of a core member (2) having concavities and convexities are covered by the sheets (8, 10). This hollow structure is equipped with a synthetic resin core member (2) having concavities and convexities in the thickness direction (D1), a first sheet (8) of synthetic resin for covering one side of the core member (2), and a second sheet (10) of synthetic resin for covering the other side of the core member (2). In the core member (2), first convex parts (24) projecting on one thickness-direction (D1) side are multiply disposed in a staggered manner in plan view, and second convex parts (34) projecting on the other thickness-direction (D1) side are multiply disposed in a staggered manner in plan view.</p> |
