| 摘要 |
PROBLEM TO BE SOLVED: To provide a guard fence superior in the shock absorbing effect capable of smoothly transmitting tension of a rope body to columns. SOLUTION: The columns 2, 3 and 2 are erected at an interval. Rope materials 4 and 4' being the rope body are vertically installed at an interval between these columns 2, 3 and 2. The two rope materials 4 and 4' are gripped by predetermined frictional force by a shock absorber 21. When tension of a predetermined value or more acts on the rope materials 4 and 4', sliding of the rope materials 4 and 4' is allowed. A guide groove 12 is arranged for guiding one rope material 4 along the column 3. When the tension of the predetermined value or more acts on the rope materials 4 and 4' by impact force such as a falling rock, the rope materials 4 and 4' slide to the shock absorber 21, and absorb the impact force by friction energy by this sliding. In this case, even if the rope material 4 slides to the column 3, since the rope materials 4 and 4 slide along the guide groove 12, unreasonable force is not applied to the rope material 4 and the column 3, so that the rope materials can smoothly slide. COPYRIGHT: (C)2006,JPO&NCIPI
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