| 摘要 |
PROBLEM TO BE SOLVED: To efficiently support horizontal rope members receiving impact force of a falling stone, by a plurality of posts. SOLUTION: The plurality of posts 2 are provided at predetermined spaces, and the horizontal rope members 3, 3A are provided in multiple stages between the posts 2. The horizontal rope members 3, 3A are provided with oblique arranged parts 103, 103A passing along the front part of the post 2 and along the rear part of the post 2 adjoining the post 2. Between the adjoining posts 2, at least a pair of oblique arranged parts 103, 103A of the horizontal rope members 3, 3A provided in multiple stages are arranged in an intersecting state in a longitudinal direction. When the falling stone R hits the pair of oblique arranged parts 103, 103A between the adjoining posts 2 to bend the horizontal rope members 3, 3A backward, the two horizontal rope members 3, 3A are supported by four posts 2. The horizontal rope members 3, 3A can thus be efficiently supported by the plurality of posts. COPYRIGHT: (C)2011,JPO&INPIT |
