| 摘要 |
PROBLEM TO BE SOLVED: To improve the function of a bridge fall preventive structure, by engaging a cable end with a bracket fixed to a bridge girder via a spring and a buffer material which is formed by laminating and embedding a fiber material in an elastic body. SOLUTION: An end of a cable 10 is engaged with a bracket 9 arranged at an end of an adjacent bridge girder 2, via a buffer material 13 and a spring 18 disposed in a buffer material box 12. The buffer material 13 is formed by laminating and embedding a fiber material in an elastic body, and has a gap 14 defined by the periphery thereof and the box 12. The spring 18 has one end thereof abutted on the buffer material 13 via an intermediate plate 17 and the other end thereof engaged with the cable 10 by means of a support plate 19. In case of an earthquake, the girder moves to pull the cable 10, and the spring 18 is compressed, which causes compressive deformation of the buffer material 13 and hence fracture of the fiber material. Further, the rubber is squeezed out of the gap 14 to a location between the box 12 and the plate 17 to absorb impact energy, to thereby smoothly transfer a tensile force to the cable. Thus, large energy can be absorbed, and girder can be prevented from falling.
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