| 摘要 |
<p>Floors for dwellings are injection-moulded from pref. polyurethane foam, within a perimeter frame of wooden rafters placed in the load-bearing direction of the floor, and into the light-aggregate-filled space between 2 facing plates supported by the frame. Injection is via pipes extended partially between the plates and perforated peripherally along the length between the places. The pipes are left in the completed floor, to form complementary stiffeners.</p> |
