CULVERT, MANUFACTURING METHOD FOR THE CULVERT AND FORMATION METHOD FOR THE CULVERT

摘要

PROBLEM TO BE SOLVED: To provide a culvert capable of solving such a problem that the conventional culvert constituted of a firing earthenware pipe or vinyl chloride has low absorptivity because of having no collecting hole in the case the culvert uses the firing earthenware pipe and that the culvert constituted of used vinyl chloride results to one cause of public pollution because of having no reprocessing method.;SOLUTION: The culvert is constituted of a drainage pipe body 1A and a group of collecting holes 1B, the drainage pipe body 1A is constituted of a pipe-like inner circumferential surface 1A2 formed by hollowing out the center of a log, and a group of collecting holes 1B is constituted of collecting holes 1B1 bored in the drainage pipe body 1A at predetermined intervals.;COPYRIGHT: (C)2005,JPO&NCIPI