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(上接2012年第9期)由于顶部的边框一个整体部件,不能用螺栓U形环。上拉紧绳直接系在顶部边框上,拴在如图24所示的位置,固定的方法和渔网相同。一个酒瓶结套系在边框上。另外半个绳套与绳子的尾端扎紧防止结松开。对顶部边框的HDPE吊孔进行了调研并制作焊接到HDPE角上。但为了HDPE的焊接足够牢固,焊接的面积要求很大,这对于初期的研究来说太冒险了。以后将用一个有吊孔的套环来安装拉紧绳(图25)。
(Continued on 2012 No. 9) due to the top of the border as a whole component, can not bolt U-ring. Tighten the rope directly tied to the top of the frame, tied in the position shown in Figure 24, the same fixed method and the same fishing net. A wine bottle knot tied on the border. The other half of the rope cover and the tail of the rope tie tight to prevent the knot from loosening. HDPE hanging holes on the top of the border were investigated and produced by welding to the HDPE corner. However, HDPE welding is strong enough to require large welding area, which is too risky for the initial study. A tensioning loop will be used to attach the tensioning string (Figure 25).