| 摘要 |
PROBLEM TO BE SOLVED: To optimize the drawing tension of a cable laid in a pipe line and to intentionally increase the resistance force between the pipe line and the cable laid in the pipe line, and enhance an effect of suppressing the movement in the laying direction of the cable caused by a surfing phenomenon.SOLUTION: A pipe line 1 embedded in the ground includes first bending portions 31a to 31c curved in one direction along a laying direction J of a cable 2 laid therein, and second curved portions 32a to 32c which are curved in the other direction opposite to the one direction. Snake portions 3a to 3c having, as one cycle, a combination of the first bending portions 31a to 31c and the second bending portions 32a to 32c which are continuously arranged are arranged repeatedly by a predetermined number of cycles. The number of cycles at which the snake portions 3a to 3c are arranged and the radius R of curvature of the first curved portions 31a to 31c and the second curved portions 32a to 32c are set so that the drawing tension T of the cable 2 to the pipe line 1 is equal to or less than the upper limit value thereof.SELECTED DRAWING: Figure 2 |
