| 摘要 |
PROBLEM TO BE SOLVED: To eliminate such a possibility that an earthenware pipe is laterally shifted when gravel or the like are placed from the side of the pipe although a conventional earthenware pipe for a culvert is cylindrically shaped and laid in a ditch and a hydrophobic material is fed on the surface for permeance of the surface water and excessive water in the soil and further, backfilling soil is charged. SOLUTION: The production method for an earthenware pipe for a culvert to solve the problem is constituted so that it can be easily and securely produced by using a mold, an inner core part, cutting jigs, and jigs for forming grooves.
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