| 摘要 |
PROBLEM TO BE SOLVED: To prevent a net field from being damaged even if it is brought into contact with a revetment and to improve efficiency on cost and safety without requiring the repair or replacement of the net field. SOLUTION: Weight-variable floats 4 having freely settable draft are aligned on a main rope 8, and float protecting frames 9 are arranged below the weight- variable floats 4. The aligned weight-variable floats 4 are connected together by net-like members 14, and the main rope 8 and the float protecting frames 9 are fixed by float bands 10 arranged on the outer peripheral side faces of the weight-variable floats 4 via connecting parts 12.
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