| 摘要 |
<p>The flanges (1) of the beams have at least three plies and the holes in the web (6) are exactly spaced and formed by spacing the web sheets. The faces of the web remain rough because the sheets that form it are not dressed but they can be flushed during the assembly of the elements. The beams allow purlins to be cantilevered at right angles to the gaps, the ceiling can be placed on the purlins followed by a large thickness of insulation, and then the roof is placed to cover all elements.</p> |
