| 摘要 |
<p>Foamed plastic structures, esp. walls and roofs, wheather straight or curved are made by casting in stages successive wall areas which are joined without seam formation. A pair of moulding walls (shutters) are used, these being advanced from each stage to the next (either alongside or above) along a template course. The prefd. appts. for building a circular or polygonal structure comprises moulds travelling around a central, vertical axis.</p> |
