| 摘要 |
A laying method for laying communication cables ( 16 ) is provided which allows to lay optical fiber cables ( 20 ) in an underground pipeline such as a sewage pipe neither placing direct tension nor allowing slack on them, and for a main pipe in which a plurality of optical fiber cables ( 20 ) are to be laid, the method also allows to lay optical fiber cables ( 20 ) in the upper space of inside the pipeline and to obviate the need of an expensive robot for the laying operation. In the proposed laying method, a high-strength low-elongation tension member is disposed to be slidable in the lengthwise direction along each optical fiber cable ( 20, 21, 22 ), and the tension members ( 25, 26, 27 ) are drawn into the underground pipeline ( 1 ) to tension the trunk tension member ( 25 ) thereby stretching the trunk tension member ( 25 ) substantially straight in the underground pipeline ( 1 ), and thus the optical fiber cables ( 20, 21, 22 ) are laid in the upper space of inside the underground pipeline ( 1 ). Also the branch tension member ( 26, 27 ) is tensioned in the branch pipe ( 4, 5 ) to lay the optical fiber cables ( 21, 22 ) in the branch pipe without allowing slack.
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