HOLLOW MATERIAL, HOLLOW MATERIAL UNIT, AND PIPING METHOD IN HOLLOW MATERIAL UNIT

摘要

PROBLEM TO BE SOLVED: To provide a hollow material capable of easily laying CD tubes or the like without much labor, hollow material units, and a piping method of the hollow material units. SOLUTION: Incision slits 6, 7 or cutoff marks from which a fan-shaped form in plan view including a part of the outer periphery or an arc shaped form in plan view including a part of the outer periphery are formed on the upper spherical part of a spherical or capsule shaped hollow material body in a hollow material 1. COPYRIGHT: (C)2004,JPO&NCIPI