| 摘要 |
<p>PURPOSE:To reduce the quantity of the metal material used, by installing a slab in the vicinity of the ground surface and installing a semispherical shell which is upwardly covex over said slab. CONSTITUTION:A ferro-concrete slab 1 is laid in the vicinity of the ground surface of a base ground (a), and a semispherical shell 2 made of metal is installed upwardly in convex form over said slab, and the lower edge of the semispherical shell 2 is extended downward vertically and buried inside the slab 2. A thin metal film 3 is applied onto the upper surface of the slab 1, and the peripheral edge of the film 3 is connected liquidtightly with the semispherical shell 2. Thus, a load is dispersed to the base ground (a) through the slab 1, and the material used is reduced, in comparision with molding a spherical surface, and the surface outside pressure is directly transmitted to the slab 1 by means of the bottom plate.</p> |
