| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel earthenware pipe for closed conduit arranged in one row in an earthenware pipe embedding ditch by an automatic earthenware pipe embedding machine to continuously feed the earthenware pipes via a chute. SOLUTION: Earthenware pipes for closed conduit are continuously arranged in one mw in an earthenware pipe embedding ditch 11 using an earthenware pipe embedding machine to continuously feed earthenware pipes 12 via a chute 15. A blade-shaped stabilizing auxiliary foot 2 is provided on the equally-spaced lines parallel to each other in the longitudinal direction on an outer circumferential surface of a body 1 of the earthenware pipes for closed conduit, one end face of the earthenware pipe body 1 for closed conduit is a recessed and tapered part 3, the other end face thereof is a projecting tapered part 4, and when the earthenware pipe bodies 1 for closed conduit are joined for use, these recessed tapered part 3 and the projecting tapered part 4 are fitted to each other, and the end faces of the blade-shaped stabilizing information feet 2 are butted to each other.
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