| 摘要 |
<p>A box-like chassis has an external framework separating upper and lower panels, the space between being filled with a thermal insulating material resistant to water and press, the chassis being placed side by side with similar units, the remaining space being filled by a thermal insulating material resistant to water and press. The insulating material is pref. expanded polyurethane with closed cells and may be formed in situ. Spaces between the chassis units created by chamfering the ends may be used for drainage and for filling the space with insulating material.</p> |
