| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to obtain a dome suitable for a baseball ground at a low cost. SOLUTION: A tension ring 8 provided to the circumference of a spherical dome roof 5 is borne on a lower tension ring 4 through a wall in a state to position it in an inclined posture to ground, the lower tension ring 4 is so placed that a virtual arc (a) with the same curvature ranging with the arc including the roof center RC of the spherical dome roof 5 and the inclined upper end of the lower edge of the spherical dome roof 5 is positioned to the roof center RC side rather than the intersection (b) with a setting level L of the lower tension ring 4, and both tension ring 8 and lower tension ring 4 are constituted in a circular shape.
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