| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress damage, and attain continuous use even if a fire breaks out by forming a surface layer at a cable protection pipe out of non-woven fabric whose main component is cellulose fabric. SOLUTION: This cable protection pipe is constituted of an FRP layer 11 of vertical directional fabric, an FRP layer 12 of spiral fabric, an FRP layer 13 of vertical directional fabric, an FRP layer 14 of a mat or cloth fabric, and a resin impregnated surface layer 15 for forming a smooth surface. Non- woven fabric whose main component is cellulose fabric is used as fabric material of the surface layer 15, and phenol resin is used as an impregnated resin for the respective FRP layers 11 to 14, and the surface layer 15. After manufacture by a continuous extruded filament winding method, and immersion and impregnation by phenol resin bath, the non-woven fabric for surface is coated, reshaping and resin hardening are conducted, and impregnated hardening can be conducted uniformly without generating a dry spot. It is thus possible to suppress damage, and attain continuous use even if a fire occurs under a bridge.</p> |
