| 摘要 |
PROBLEM TO BE SOLVED: To widen the selection of a driving position of a main anchor without impairing the balance of the whole net and to uniformly fix a ring net as soon as possible. SOLUTION: A ring net is equipped with a net unit 5 connecting rope ring g in the shape of a rectangle, a first joint device 16 connecting a main rope 3 or 4 stretching the net unit to a boundary thereof and a second joint device 17. Since the first joint device 16 has a U-bolt and a holding plate, and a joint plate member for fixing a main anchor 20 is provided to the first joint device 16 positioned to a distance (p) approximately equivalent to an interval between cross joint devices 5. The second joint device 17 is equipped with a U-shaped bending metal fixture and bolt, and the joint devices 16 and 17 allow the movement or the slippage of the holding rope. The cross joint device 5 for fixing a cross section of the main rope is not accompanied with an anchor, and the net unit 6 is fixed with the main rope together with the main rope.
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