| 摘要 |
<p>PURPOSE:To facilitate the installation of the kinds of piping by excavating a ditch on the ground surface, burying a culvert made of foamed resin therein, thereby installing the kinds of piping within said culvert. CONSTITUTION:A ditch 1 is excavated on the ground surface, and a culvert 2 made of foamed styrol and the like is buried within the ditch 1 so that piping such as water supply, sewage pipes, electric cables and the like is installed therein. By this constitution, installation works can be done more easily than the previous ones wherein a concrete culvert heavy in weight is usually used.</p> |
