抄録
The ring-net-works have been spread as a rock-fall barrier in Japan. We investigated accordingly the usages such as “Plan” “Design” “Work” “Management” of ring-nets. We state on this time the some usages currently as “The Actual Condition” using the results by compiling statistics of data. And we state some comments about some usages “The established exceed load for the ring-net” and so on.
