| 摘要 |
PURPOSE:To reduce the thickness of a bottom panel and to increase the bending strength thereof along the width direction, by molding a square-cylindrical resin continuous hollow extrusion molded body wherein continuous undulation parts are respectively provided to one of mutually opposed plate parts along the longitudinal direction and dividing the same into two sections at the part of the other of mutually opposed plate parts. CONSTITUTION:A continuous hollow extrusion molded body A1 made of a resin has a square- cylindrical shape and plate parts 2 opposed to each other up and down are formed into a corrugated board shape having continuous undulation parts along the longitudinal direction P thereof and several ribs 6 are provided to the plate parts 4 opposed to each other left and right along the longitudinal direction P. A receiving shelf B1 for a pipe or cable has an integrated structure formed by dividing the square-cylindrical resin continuous hollow extrusion molded body A1 into two sections in the up-and-down direction. Since the bottom part 12 of the receiving shelf B1 for the pipe or cable has a corrugated board shape having undulation parts in the longitudinal direction P, the bending strength along the width direction Q thereof is markedly increased as compared with that of a flat bottom plate and, even when the thickness of the bottom plate 12 is reduced, the bending of the bottom plate 12 in the width direction Q by the wt. of the pipe or cable can be prevented. |
