| 摘要 |
For a cable to be laid inside a duct, the invention teaches the addition of "scales", projections, or roughening outwardly from the cable sheath to help a cable-laying procedure wherein the cable is carried through the duct, from all along its own length, by blown air emitted from behind. Substantial improvements in laying speed and efficiency over existing blown air techniques are provided, with less strain on the cable than if pulled by a winch, and reduced laying costs are claimed. As a result of the full-length support provided during laying, cables may be of lighter construction than that required for withstanding conventional laying procedures.
|
