| 摘要 |
PURPOSE: A communication line protecting pipe is provided to safely protect a communication line from heat by passing thermal air current through a wide space between a groove with a low depth and the outer surface of the communication line. CONSTITUTION: A communication line protecting pipe is comprised of an inner pipe(110) and an outer pipe(120). Two or more inner pipes are inserted into the inside of the outer pipe. A telegraph line or optical cable is inserted into the inside of the internal pipe. The inner pipe is comprised of a wrinkle pipe with a groove part(112,112') inserted along the longitudinal direction and a protruded part(111) along the longitudinal direction. The outer pipe is comprised of a wrinkle pipe with the groove part inserted in the longitudinal direction and the protruded part along the longitudinal direction. The depth of the groove part of the inner pipe has a step based on the diameter center of the inner pipe along the longitudinal direction of the inner pipe. The protruded part and the groove part are rounded to minimize a contact area between the outer pipe and the communication line. |
