Masahiro Mukaigasa
Development of buffer devices for falling rock protection and performance evaluation
Eiji Iwasaki
In Japan, lots of falling stone disasters are occurring from influence such as earthquake and climate etc. Then there are numerous falling rock protections, but these methods include some problem in safety because those need work on the slope in the construction. For solve this problem, the methods have to be improved concerning process of construction. Therefore this paper developed 2 type buffer devices that is used in falling rock protection and evaluated the performance of that. One of the buffer (Type-A) is tightened by 2 bolts, another one (Type-B) is made up by 4 bolts.
The buffer device is equipment that absorbs the falling rock energy by convert that energy into frictional force on wire-rope of falling rock protection.
This paper investigates the performance of the buffer device that developed. Some relation was clarified in evaluation test. As a result, tension of the wire-rope by buffer device is related with the making condition of a test piece. And the tension is constant unrelated with fall height of weight. In this paper, the tension is defined as 55kN by considering about the result of the evaluation test. This value is used in the analysis process. Moreover, most of the falling rock energy is absorbed by the buffer device. And the behavior of these devices on the falling rock protection became clear. On the whole, Type-B device has better precision than Type-A on the experiment. So Type-B device is adopted in this paper.
After the experimental process, It comparison these results that of falling rock experiments and dynamic response analyses. Dynamic response analyses can simulate these performances of falling rock protection under the various falling rock forces.
In conclusion, these performances of the buffer device are cleared by evaluation test and the falling rock protection can be estimated by dynamic response analysis.
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