To arrange blocks for a large space dome or roof by providing a block form consisting of juxtaposed isosceles triangles, and arranging ones having a large number of triangles most preferentially in relation to the hoisting ability of a using crane so as to be mutually non-connected.
In a single layer lattice large dome roof 1 having an isosceles triangle close to equilateral triangle as a basic grid, the largest block form consisting of isosceles triangles arranged side by side in a row is set. From the hoisting ability of a using crane, a block (d) having four isosceles triangles is preferentially arranged, and a block (c) having three triangles, a block having two triangles, and a block having one triangle are arranged in the remaining space so as to be mutually non-adjacent. In this case, the remaining blank is erected with a single frame, while ensuring regulating spans 2, 3 for welding convergence and thermal expansion and contraction in the intermediate part and isometric diagonals of the dome roof. Since the roof frame is stabilized so as to be capable of self-standing when the dome center part, the symmetric circular intermediate part having about 60° on both side thereof and the circumferential part are completed, the frame is successively extended.
URYU KUNIMITSU
IINUMA SHIGEO
ICHIKAWA ATSUSHI
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