| 摘要 |
<p>The invention relates to a procedure for applying a plastic layer on the internal surface of closed-section prefabricated concrete or reinforced concrete units, especially pipes, in the course of which procedure fibreglass-reinforced thermosetting artificial resin is applied onto the internal surface by spraying it with a spray nozzle. The equipment has a spray nozzle suitable for spraying fibre-reinforced artificial resin; and it is based on the idea that bonding elements, especially couplers and/or spikes and/or hooks made of metal are embedded in the internal surface of the prefabricated concrete or reinforced concrete unit in a protruding way, or/and the internal surface is roughened, and then fibreglass-reinforced artificial resin is sprayed on the surface while it is being rotated continuously around its own longitudinal geometrical axis and the spray nozzle is being moved inside the unit along a straight track.</p> |
