A method for constructing cage body of tapered cage assembled in rigid-flexible manner, wherein a rigid copper alloy stretched net and a flexible synthetic fiber net are assembled to the cage body of the tapered marine aquaculture cage, a structure of the cage body of the cage from upper to lower comprises a first segment net circle, a second segment net circle, a third segment net circle, a fourth segment net circle and a bottom net, the first segment net circle and the third segment net circle are produced by assembling a long strip netting standard component made of a knotted net woven by the flexibly connected flexible synthetic fiber net cable;
- the second segment net circle and the fourth segment net circle are produced by alternately assembling a standard component prepared by a copper alloy stretched net and an isosceles trapezoid netting standard component prepared by the flexible synthetic fiber net;
- the bottom net is prepared by the flexible synthetic fiber net;
- the method is characterized by comprising steps of:
- (1) selecting a rectangular copper alloy stretched net with four peripheries wrapped for reinforcement by an ultra high molecular weight polyethylene sheet material, and pre-preparing a docking ring for quick connection to prepare the copper alloy stretched net standard component;
- (2) selecting the high performance synthetic fiber net to weave the knotted net, cutting the net after stretching heat shaping and resin consolidation treatment in order to produce a net with a fixed mesh size and fixed longitudinal and lateral mesh amount;
- producing a long trip synthetic fiber netting and an isosceles trapezoid synthetic fiber netting by assembling a high performance synthetic fiber rope, and pre-assembling a tube ring by cutting the ultra high molecular weight polyethylene tube into segments and assembling the rope, wherein a distribution component of the tube ring is staggeredly corresponding to the pre-assembled docking ring at a periphery of the copper alloy stretched net standard component, so that the long strip and isosceles trapezoid synthetic fiber netting standard components are prepared;
- (3) selecting the high performance synthetic fiber net, cutting and assembling the bottom net in order to preset a shape and size of a bottom, assembling a reinforcing on the bottom net, assembling a high performance synthetic fiber rope at a periphery of the bottom net, pre-assembling a tube ring by segment cutting the ultra high molecular weight polyethylene tube into segments while assembling the rope, wherein a distribution component of the tube ring is staggeredly corresponding to the above mentioned docking ring pre-assembled on the copper alloy stretched net standard component and the synthetic fiber netting standard component, thus preparing the bottom net component of the case body of the tapered cage which is capable of quickly assembling;
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- (4) assembling the case body comprising firstly installing the long strip synthetic fiber netting standard component on a rope at a top end of the case body for connecting the case body with the case frame to produce the first segment of the synthetic fiber net circle starting from the tying position to a waterline;
- and then staggeredly assembling the pre-installed tube ring with the docking tube ring installed at a short edge of the copper alloy stretched standard component and finishing connection by threading the high performance synthetic fiber rope through the tube rings, and then connecting the long edge of the copper alloy stretched standard component with the tube rings on the lateral side of the isosceles trapezoid synthetic net standard component and threading the rope through the tube ring and the docking tube ring;
- similarly, producing the second segment of the net circle by assembling the long base of the isosceles trapezoid synthetic net standard component with the bottom of the first net circle, and then producing the third segment of the net circle by assembling the other short edge of the copper alloy stretched net and the short base of the isosceles trapezoid synthetic fiber net standard component with the long strip synthetic fiber net standard component in the same method, that is, by matching the tube rings and threading the rope through the rings;
- the method of producing the fourth segment of the net circle, which is assembled by the copper alloy stretched net and the isosceles trapezoid synthetic fiber net, is the same to that of producing the second one, however, a length of the long base of the trapezoid net equals to the short base of that of the second segment;
- the tube rings at the bottom of the fourth segment is matched with the tube rings on the synthetic fiber bottom net and connected with rope, thus the cage body of the tapered gravity cage assembled by the rigid copper alloy stretched net and the flexible synthetic fiber net is constructed.