| 摘要 |
<p>Concrete tubing reinforced with glass fibres and plastic material nets, consisting of several superimposed layers obtained by a mixture of cement, water, inert substances, possibly additives, one or more of said layers containing said glass fibres and plastic material nets. The process for manufacturing said tubing consists in repeatedly winding on a suitable mandrel (1) a layer of the cement mixture in which glass fibres and plastic material nets are incorporated until the desired thickness is reached.</p> |
