| 摘要 |
<p>Two spaced horizontal plywood, pressed wood, plasticiser similar panels combine with end and side battens to enclose a space filled with hard foam, in a frame board for scaffolding. The two panels (1a,1b) are connected by one or more lengthways battens glued to them. The length of these battens is shorter than the interval between the end battens. The connecting battens are pref. located symmetrically to the transverse central axis of the board. This is endowed with adequate rigidity, without involving any difficulties in foam-filling.</p> |
