| 摘要 |
PURPOSE: To fix roof-boards or the like by incorporating a two-layer auxiliary space frame in the opening of a hollow chamber made up of a plurality of mutually joined annual networks and closing the space so that a lattice made up of pins and node members may exist in a plane. CONSTITUTION: Two-layer auxiliary space frames 1 to 4 are formed in a space frame having openings 15 of a hollow chamber defined by annual networks 11 so that there may exist lattices made up of pins 6 and node members 7 in a plane. Subsequently the auxiliary space frames matching the shape of the openings 15 are incorporated to close the spaces, thereby fixing roof-boards or sidewall laggings.
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