| 摘要 |
PURPOSE: A communication line protecting pipe is provided to minimize a contact area of an inner pipe with an outer pipe and a communication line by forming a round groove part and a round protruded part of the inner pipe. CONSTITUTION: A communication line protecting pipe includes an inner pipe(110) and an outer pipe(120). A communication line(130) is inserted into the inner pipe. A plurality of inner pipes are inserted into the outer pipe. A wrinkle with a groove part(112,112') and a protruded part is helically formed on the inner pipe in rows. The groove part has a step based on the diameter center of the inner pipe every interval along the longitudinal direction of the inner pipe. The protruded part and the groove part of the inner pipe are rounded to minimize the contact area with the outer pipe and the communication line. The outer pipe is comprised of a wrinkle pipe with a ring-shaped wrinkle. |
