JPS5941367B2 - bellows fishing net - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fishing net used for aquaculture partition nets, aquaculture cage nets, fixed nets, and the like.

Conventionally, fishing nets have been made using a single piece of net, such as a partition net or a fish cage net, or a net with multiple floats at the top end, floating on the sea surface and a weight at the bottom end, which is placed on the seabed or in the sea. Ta.

In addition, fixed nets are constructed with only floats installed at the top of the net, and fish are guided and captured along the path.

However, since this type of fishing net is composed of a single piece of net, there is no way to avoid the movement of the sea surface and currents caused by currents, storms, raging typhoons, etc. (and problems such as damage to the fishing net occur). Ta.

For example, when the bottom net is placed in a fish cage net or when the sea level rises rapidly due to waves, the bottom net is suddenly pulled up by a float suspended on the sea surface.

At this time, large water pressure is applied to the bottom net, and the water pressure applied to the bottom net causes a large tension to act on the fishing net, causing breakage of the fishing net.

In addition, the fishing nets were blown away by the currents and rapids, making it difficult for the fish to swim.

In the case of partition nets and fixed nets, the fishing net is blown by the current,
Because the current is thick in the direction of travel, problems have arisen in that it damages the fish being farmed and blocks the route to guide the fish.

The bellows type fishing net of the present invention was developed in view of these drawbacks, and its primary purpose is to obtain a fishing net that can withstand waves, wave heights, currents, stormy weather, and typhoons, and preserve fishing grounds. The second objective is to prevent aquaculture pollution by making it possible to set up fishing nets in rough open seas.Furthermore, fixed nets can overcome storm surges and typhoons, and reduce the labor of fishermen in lifting nets during operations. The third purpose is to

The bellows type fishing net of the present invention that achieves the above object has the following features.

(2) The components of the bellows in the present invention are buoyancy and gravity, and are characterized by the expansion and contraction action of the bellows and the tension of the bellows.

■ Principle of forming a bellows in a fishing net The upper end is fixed to the sea surface by a large float and the bottom weight is provided at the lower end.If the (first) float is installed in the middle of the fishing net, the buoyancy of the (first) float will be equal to the bottom weight. If the float is larger than the gravity of

However, by installing a (first) weight between the large float and the (first) float, the buoyancy of the (first) float is controlled by the bottom weight, which is thicker than the gravity.
In addition, when the gravity is made smaller than the total gravity of the (first) weight and the bottom weight, the (first) float is prevented from rising by the (first) weight.

At this time, the fishing net has the (first) float as its apex, and the (first)
One surface formed by the weight and the (first) float and one surface formed by the (first) float and the bottom weight are folded back to form a bellows.

That is, this is a case where one bellows net is formed in the fish cage net.

Also, even if the length of the fishing net is longer than the depth of the water and the bottom weight is fixed to the seabed, the structure is formed by the (first) weight and the (first) float, with the (first) float as the apex. One side (first
) The fishing net is folded back on one side formed by the float and the bottom weight to form a bellows.

That is, this is a case where one bellows net is formed in the partition net (or fixed net).

In this way, a bellows net is formed by the mutual relationship between buoyancy and gravity, and if a plurality of weights and a plurality of floats are provided alternately on a fishing net, a desired number of bellows can be formed on the fishing net. I can do it.

For example, in the case of a fish cage net, there is a "first
The weights and floats are provided alternately at intervals in the following order: weight → first float → second weight → second float → bottom weight. If the gravity and buoyancy of each of the floats are made equal, and the bottom weight is made half the size of the first and second gravity, two bellows will be formed in the fishing net.

Note that the conditions for the formation of a bellows are that the above relationship between gravity and buoyancy does not necessarily have to hold; however, in the case of the above relationship, the tension of the fishing net on each side of the bellows must be the same (
This is the same magnitude as the tension generated between the second float and the bottom weight, and an ideal bellows can be obtained.

■ When forming a bellows on an actual fishing net, a main rope is attached to the upper end of the fishing net, and a large float is attached to this main rope to fix the upper end of the fishing net to the sea surface.

In addition, a large weight (or chain, etc.) is attached to the bottom end of the fishing net and fixed to the seabed (in the case of a partition net).

Furthermore, one or more float rows are formed by providing floats at intervals or in a row (continuously) in the middle of a net formed by large floats and large weights.

In this case, the direction of the float rows is the direction that intersects the net, and if they are provided parallel to the main rope, it is good for forming a bellows.

Further, the float rows are usually linear, but are not limited to this, and may be wavy or stepped.

A spindle row is formed in the same manner as this float row.

In this case, the weight row is provided at a predetermined interval from the float row.

This interval determines the length of each surface constituting the bellows described above.

The float rows and weight rows are mainly formed by providing vertically and horizontally connecting reinforcing ropes on a fishing net, and providing floats and weights on the connecting reinforcing ropes (hereinafter referred to as reinforcing ropes).

In addition, the horizontal reinforcing rope (first reinforcing rope) is the net 1]
A vertical reinforcing rope (second reinforcing rope) is a rope extending in the width direction.

In this way, by providing the float and the weight on the reinforcing rope, the expansion and contraction of one bellows is transmitted to the other bellows and the fishing net is automatically tipped, so that no local stress is placed on the fishing net and the fishing net becomes strong.

Therefore, an orderly bellows is formed. ■ About the restoring force and knitting of bellows nets As mentioned above, bellows nets are formed by the balance between floats (buoyancy) and weights (gravity), and the fishing net is folded back by these floats and weights.

In this case, if we consider a single bellows net with a float at its apex, this bellows net has a fishing net on one side formed by a weight and a float;
It consists of a fishing net with one side formed by a float and a sinker.

Naturally, the fishing nets on each side of the bellows net are held upright in the water by the buoyancy of the floats and the gravity of the weights.

In the case of a bellows net, each surface constituting the bellows net has its own assembly effect.

In other words, in order to protect fishing grounds from tidal currents and maintain fishing grounds, netting is an essential condition, and conventionally, netting is done by hanging a chain or a rope with a weight at the end from the sea surface to the seabed. It was again.

However, in the case of a bellows net, each surface constituting the bellows net has the effect of knitting, and the above-mentioned special knitting is not necessarily required.

The thicker the floats (buoyancy) and weights (gravity) that form each surface, the greater the effect of knitting.In other words, external forces such as tidal currents that try to stretch the bellows will affect the bellows net. When this happens, the force (restoring force) that tries to maintain the bellows becomes large.

It is necessary to set the size of the float (buoyancy) and weight (gravity) depending on the location where the bellows net has such properties, and for example, it is necessary to set the size of the float (buoyancy) and weight (gravity) depending on the location where the bellows net is installed. In calm inland seas, a bellows net may be formed without using a weight, using the gravity of a net or reinforcing rope and a float (buoyant force) large enough to balance this.

Note that when the gravity of the net increases beyond the buoyancy due to deposits, the bellows collapses and becomes an elongated bellows.

An embodiment of the present invention will be described below with reference to the drawings.

Figures 1 to 4 and Figure 7 are explanatory diagrams when bellows nets are used as partition nets. Enlarged perspective view, Figures 3 and 7
The figure is a cross-sectional view for explaining the action of the bellows of the partitioning net in FIG. 2.

In these figures, the partition net 1 consists of a bellows net 2 and a lid net 3.

The material of the partition net 1 is made of pure cotton, chemically synthesized net, blended net, or the like.

A main rope 4 is integrally stretched over the upper end of the mesh l of the bellows net 2 on the sea surface side, and as shown in the plan view of Fig. Or, it can be partitioned by extending it offshore from an embankment on land.

Large floats 5 are fixed at arbitrary locations on the main rope 4 at appropriate intervals.

Further, a rope I is integrally stretched at the lower end of the bellows net 2 on the seabed side in the net (water depth) l, and a chain 8 is fixed to this rope I to prevent the net from floating up.

Further, a plurality of horizontal reinforcing ropes 90 to 97 are provided approximately parallel to the main rope 4 in the middle of the net from the sea surface side at the upper end to the sea bottom side at the lower end of the bellows net 2.

The configuration of the bellows net 2 is such that floats 11, 13, 15, and 17 are provided for each row of the horizontal reinforcing ropes in odd-numbered rows among the horizontal reinforcing ropes 90 to 97, for example, 91, 93, 95, and 97. horizontal reinforcing ropes in even-numbered rows, e.g. 90, 92
, 94, 96 have weights 10.12, 14, 16 for each row.
Let each be a column of weights.

In this case, each float 11°13.1 in each row of floats
The buoyancy of 5, 17 is the weight of each weight row 10° 12.14, 16
weight of the net, and the horizontal reinforcing rope 90, 91.92,
The total gravity of the weights 93, 94, 95, 96°97 is calculated so that the bellows are formed in stages in the sea.

The length of the bellows is determined by the length of the mesh on one side and the second side of the bellows.

In the above partition net, for example, floats 11, 13° 15.1
In order to form four bellows with 7 as the apex, the following relationship needs to be satisfied (provided that the buoyancy and gravity of the float and weight are sufficiently large and the gravity of the net, reinforcing rope, etc. can be ignored) ).

The total gravity of weights 10, 12, 14, and 16 is float 11.13
, 15.

If the opposite is true, any or all of the floats 11, 13, 15 will float.

The total buoyancy of floats 11, 13° 15.17 is weight 12, 14
．． must be greater than the total gravity of 16.

If it is the opposite, any or all of the weights 12, 14, 16 will be lowered.

.......

The total buoyancy of the floats 15 and 17 is greater than the gravity of the weight 16.

If it is the other way around, the weight 16 will descend. In this way, in order to form a bellows net, the floats that act directly on these weights (floats 13, 15 for weight 14, floats 12, 14, 16 for weights 14, IL13
゜15.17) so that the total buoyancy becomes large,
Furthermore, the sizes of the floats and weights may be determined so that the total gravity of the weights acting directly on these floats is greater than the total buoyancy of one or adjacent floats.

Ideally, these relationships should be calculated as closely as possible when designing an actual bellows network.

Even if the gravity of the net increases due to deposits, the net will not sag as long as there is no deposit that exceeds the buoyancy of the float because the buoyancy of the float is greater. Similarly, the floats and nets will not droop due to buoyancy.

For this reason, this bellows net floats the upper end on the sea surface side with large floats 5 whose buoyancy is much greater than the buoyancy of the individual rows of floats that make up each row of bellows, and the lower end with a thick piece of chain or the like (with a gravitational weight 8
is fixed to the seabed.

In addition, normally, the weights 10, 12, 14, 16 and the floats 11,
The gravity and buoyancy of 13, 15, and 17 should be the same.

By making the buoyancy and gravity for forming the bellows the same in this way, the tension of the net between the weight and the float becomes approximately the same, and an ideal bellows can be formed.

Furthermore, when forming a bellows with a large restoring force, it is necessary to use a weight with a large gravity and a float with a large buoyancy.

In addition, in such a case, instead of using a single weight or float, a plurality of weights or floats may be provided in the width direction (for example, a weight 14
If the weight of one piece is 7 to 50, then the weight of 10Ky is 5
(distributed in the mesh width direction).

In this way, it is possible to reduce the effort required to lift weights and the like from the sea surface when unloading nets.

In addition, when providing strength or weakness in a part of the bellows, it is only necessary to adjust the tension of that bellows.

In the bellows net 2 used as the partitioning net, the bellows were formed by alternately using the weight rows and the float rows, but this order may be reversed.

In addition, the bellows are formed by using only a float without using a float and a weight.
The weight of the net may be used instead of the weight.

In addition, the buoyancy of the float should be made thicker than the weight of the net, weight, and reinforcing rope (
It is also possible to form a bellows by doing so.

Further, in the embodiment of the present invention, 18 is a vertical reinforcing rope.

This is connected 6 to the arc control main rope 4 at the upper end, and the bellows net 2 formed between the nets 1 has weights 10, floats 11, weights 12, floats 13 to 1 from the first row to the nth row. The floats 17 in the (n-1) to n-th rows are connected and their lower ends are connected to the bottom rope I for reinforcement.

These vertical reinforcing ropes 18 may be provided at appropriate intervals (it is not necessary to connect all the floats and weights).

In addition, in a partition net at a water depth of about 50 m, the interval between the vertical reinforcing ropes 18 should be about 5 to 10 m.

Next, the lower end of the cover net 3 is fixed to the arc control main rope 4,
The upper end is fixed to the lid net rogue 19 located at the height of the diameter of the large float 5 (.

A float 20 is placed at an arbitrary point on the rope 19 for the lid net.
Secure the rope appropriately to prevent the rope from sagging (.

The cover net 3 is designed to prevent fish from jumping out from the partition net 2 through the sea surface, but it should not be used at all times unless there is a particular need.
It's fine.

21 is an inner rope.

This inner rope 21 serves as a braid when the waves are not high.

The upper end of the inner rope 21 is fixed to the main rope 4, and the lower end is raised about 2 to 3 meters from the seabed near the hem of the net.
A weight 22 is provided.

Further, an inner tension rope 21 is extended to the weight 22 and the end thereof is fixed with an anchor 23 such as a ring or a concrete block.

The position to fix this anchor should be at least twice the depth of the water.

Further, the distance between the inner stretch rogues 21 is about 10 m to 20 m.

24 is an outer tension rope.

One end of the outer tension rope 24 is fixed to an arbitrary location on the arc-control main rope 4, and the inner tension rope and the outer tension rope are extended from the same location.

A float 25 is provided at a distance of about lom to 20 m from the arc-control main rope 4, and an anchor 26 made of a ring or a concrete block is fixed to the end.

Further, the length of the external tension rope 24 must be at least twice the depth of the water.

Since the outer tension rogue 24 is given buoyancy by the float 25, the large float 5 moves up and down due to waves and turbulent waves, facilitating its movement when expanding and contracting the bellows net 2.

Further, it is effective to provide a plurality of floats 25 on one rope at a certain distance.

Next, the action of the bellows net of the present invention will be explained using FIGS. 3 and 1.

Figure 3 shows a case where the wave height suddenly increases.

When the typhoon 27 rushes toward the bellows net 2, the large float 5 is forcibly pulled up by the height of the waves.

Along with this, the weight 22 is also lifted. Partition net is bellows net 2
Since it is a toss, multiple weights and floats are pulled up in a chain.

Therefore, by lifting the weight 10, the gravity of the weight 10 acting on the float 11 disappears, and the float 11 floats.

The buoyant force of the float 11 is then transmitted to the next weight 12, and the weight 12 is also pulled up in a chain reaction.

This chain reaction continues to the next float 13, weight 14, and then to weight 16 and float 17 (.

In this way, the bellows net 2 buffers the impact caused by the raging typhoon, overcomes the waves, and expands and contracts as the waves move up and down.

Figure 7 shows a case where a tidal current washes over the partition net.

When a tidal current rushes in the direction of the arrow shown in FIG. 1, a conventional partition net made of a single piece of net will be blown greatly in the direction of the arrow.

However, in the bellows-type fishing net of the present invention, as described above, each surface that makes up the bellows net has an assembly action, so it is not blown away by the current.

In this case, the greater the weight (gravity) and float (buoyancy) that form the bellows, and the greater the tension on each surface, the stronger the resistance to the current.

FIG. 4 shows an example of a stretched bellows net other than the partition net.

In this figure, a weight 10 is provided on the horizontal reinforcing rope 90, and a bellows is formed at the upper end of the wire width in relation to a float 11 provided on the horizontal reinforcing rope 91.

On the other hand, a float 13.15 is provided on the horizontal reinforcing rope 93.95, and the fishing net between the float 11 and the chain 8 is actively stretched.

By having such a configuration of the partitioning net of this example,
It exhibits the following effects.

The bottom of the partition net is fixed to the seabed by a heavy weight, such as a chain 8 shown in FIG. 4, for example.

With such a partition net, if the net is adjusted to the water depth at Qζlow tide or normal times, it will be difficult to adjust the water depth at high tide or even at high tide.
When the waves are high due to a typhoon, etc., the large float floating on the sea surface will sink into the sea, and it will no longer be able to fulfill its role as a partition net.

For this reason, conventionally, the length of the dividing net has been set to be longer than the maximum water depth expected in the area where the dividing net is installed.

However, with conventional partition nets formed in such long nets, the nets would sag significantly during normal times and even during low tide.

When currents act on this slack, the net becomes thicker (blown away, damaging the fish), and large water pressure acts on the net, causing the net to break.

Also, even when there is no current, the net sinks to the ocean floor in a folded manner, and this sunken net gets caught on obstacles on the ocean floor.
There was damage to the net.

Even in the partitioning net of this embodiment, the length inside the net is set to be greater than the maximum water depth, as in the conventional partitioning net.

However, in the partitioning net of this embodiment, the bellows net that stretches at high tide or wave height does not stretch at low tide or normal water level.
As shown in FIG. 4, the fishing net descends and uses the gravity of the weight 10 and the buoyancy of the float 11 to actively form a bellows at the upper end of the fishing net, thereby preventing the fishing net from being blown away by the tidal current at the water's edge. I can do it.

In addition, since the bellows are formed at the upper end of the fishing net, the fishing net becomes thicker due to the vertical movement of waves on the sea surface. , the mesh structure can be adjusted by the tension of the bellows.

Further, at low tide, the weight 10 and the float 11 descend as the waves descend.

However, even in this case, the fishing net is thick (it will not sag).

That is, a part of the net between floats i 1-13 is held by the float 13, and a bellows is formed with the float 13 as the apex (in this case, the bellows is formed by the gravity of the fishing net and the buoyancy of the float). .

Further, the fishing net further descends due to the vertical motion of the waves, and as the gravity of the fishing net between the floats 1i-i3 increases, the float 13 descends.

However, at this time, a part of the fishing net between the floats 13 and 15 is held by the float 15, and a bellows with the float 15 as the apex is formed to prevent the net from sagging and to prevent the net from sagging due to water pressure or obstacles on the seabed. Protect against corruption.

Therefore, the fishing net between floats 11 and 15 is a stretched bellows net that will form a bellows in the future.

FIG. 5 is a perspective view when the bellows net of the present invention is used in an aquaculture cage, and FIG. 8 is an explanatory view showing the function of the aquaculture cage shown in FIG.

In the figure, the aquaculture cage 28 is surrounded by bellows nets 2 on all sides and has a bottom net 29 on the bottom.

Moreover, since it is a fish pen, heavy weights such as chains are not used at the other end of the net on the seabed side.

To assemble the aquaculture cage, the assembly chain 30, one end of which is connected to the measuring main rope 4, is suspended inside the fish cage up to the hem of the net.

This prevents the net from being blown away by currents.

For assembly, a weight may be provided at the end of the rope.

Next, a method of configuring the bellows net 2 will be explained.

A weight 33 provided on a bottom rope 32 is suspended by a hanging rope 341 by an independently floating float 31, and the water depth of the net is fixed.

This hanging rope 341 is folded back as a vertical reinforcing rope 342 with the weight 33 fixed, and its tip is fixed to the side-limiting main rope 4.

In the middle of this folded vertical reinforcing rope 342, horizontal reinforcing ropes 35, 36, 37° 38 constituting a bellows are intersected and connected in horizontal rows.

A weight 39 is placed at the joint between the horizontal reinforcing rope 35 and the vertical reinforcing rope 342 in the first river, and a float 40 is installed at the joint between the horizontal reinforcing rope 36 and the vertical reinforcing rope 342 in the second river.
The horizontal reinforcing rope 37 and the vertical reinforcing rope 34 of the third evening
2, and a float 42 is provided at the joint between the horizontal reinforcing rope 38 and the vertical reinforcing rope 342.

In this case, the buoyancy of the float is 40°420 and the weight is 39,41.33
, the gravity of a net, etc. has the same relationship as in the case of the partition net described above.

In this embodiment, the bellows net 2 has three bellows portions, but is not limited to this.

Also, when the aquaculture cage 28 is attacked by waves or a raging typhoon,
The large float 5 is raised to the height of the waves, and the bellows are extended accordingly.

At this time, the independent float 31 comes to rest underwater in relation to the weight 33 designed to sink into the sea.

Incidentally, the method of preparing the bellows net in the fish cage net is not limited to the method shown in FIG. 5.

Furthermore, the shape of the fish cage is not limited to square, but may be circular, square, etc.

Figure 8 shows the action of the main net when a sudden wave height occurs.

In conventional fish cage nets, there was just a single piece of net between the large float floating on the sea surface and the weight attached to the bottom net, so when the sea level rises rapidly due to typhoons etc. When the float rose rapidly, the weight attached to the bottom net was pulled up rapidly by the large float, and the bottom net was also pulled up rapidly.

At this time, water pressure is generated on the bottom net in the direction of the arrow shown by the dashed-dotted line at the mouth of Figure 8, and this water pressure causes a localized large impact to be generated at the connection points of the fishing net that are connected to the large float and sinker. , the reinforcing ropes, nets, etc. at this connection point were damaged.

However, with this net, even if the wave height changes from the state shown in Figure 8 A to the state shown in Figure 8 Mouth, this wave height is absorbed by the elongation action of the bellows, so the bottom net does not Water pressure in the direction of the arrow described above is not generated (net breakage due to wave height can be prevented).

Also, since the bellows part is provided with a float, the mesh body has buoyancy and can prevent damage to the mesh due to water pressure and wave force.

In addition, although the bellows net was provided with alternating rows of weights and rows of floats in this embodiment, it is also possible to calculate the gravity of the net between float rows in the water and use it instead of the rows of weights. It is similar to

FIG. 6 is a perspective view of a case where the bellows net of the present invention is used in a fixed net of the type with the net bottom installed on the seabed.

In the figure, the fixed net 42 consists of a road line 43, a guide net 44 for guiding fish along the road line 43, and a capture net 45 provided at the tip of the guide net.

The bellows net of the present invention is provided in the guiding net 44 and the catching net 45.

The horizontal reinforcing ropes 461 are provided with weights 47 in horizontal rows, and the horizontal reinforcing ropes 462, 463, 464, 465° 466 are provided with floats in horizontal rows.

One end of the vertical reinforcing rope is fixed to the measuring main rope 4, vertically connecting the floats 481, 482, 483, 484, 485, and the terminal end is connected to the bottom rope 49 to reach the bottom net.

In this embodiment, the bellows 201 is composed of a float 481 and a weight 47 to strengthen the restoring force when the balance between buoyancy and gravity is lost, and a large number of bellows nets 201 are provided at the folded portion to protect against raging typhoons. It is designed to handle the wave height.

In addition, the bellows nets 202 and 203 form a bellows using only the gravity of the floats 482 and 483 and the fishing net, and the bellows net is slightly less in the folded part, but this is not intended for the original purpose, but is mainly used for fishing nets. This is to reduce frying work.

Further, 204 indicates the state of an extended bellows (future bellows), which prevents the fishing net from drooping by forming a bellows when the sea level drops.

Further, the knitting is performed by lifting a weight 51 provided at the tip of the rope 50 by about 2 m to 3 m from the seabed and installing it at the hem of the net.

FIGS. 9 to 11 are explanatory diagrams of a horizontal wheel experiment in which the formation of bellows in a cage net using the present invention was investigated.

FIG. 9 is a diagram showing a fish pen set in calm water.

This fish cage net is a model with a side of 0.5 m and was created based on the assumption of an actual fish cage net with a side of 5 m.It has one bellows on the wall,
One bellows was formed on the bottom net.

The specifications of this fish cage net are as follows.

(1) Materials Floattom: Styrofoam formed to have a buoyancy of 63.5 g (17.4 Ky).

Uses 4 pieces. Float B is a foamed sterol with a buoyancy of 5 g (1,6 Kg).

40 pieces used. Float C: Styrofoam formed to have a buoyancy of 63.5 g.

Uses 4 pieces. Float D = foamed sterol formed to have a buoyancy of 63.5 g.

4 pieces used,) Float E: Buoyancy 110.4 g (30,3
Styrofoam formed into Ky).

8 pieces used. Weight F in diwater is 63.5 g (17
, 4Kg).

Uses 4 pieces. Weight G: Lead weighing 63.5 g in water.

Uses 4 pieces.

Weight H: Weight in water is 110.4 g (30.3 Kg
) formed lead.

Use 1 piece. Anchor ■Made of double iron.

Vertical reinforcement Rogue J: Nylon root wine 1.5φ0 Horizontal reinforcement rope: Nylon root wine 1.0φ.

Anchor rope L: Nylon root wine 1.7φ0 mesh M: Nylon mesh.

Combine four pieces of 21O denier and make one string. This string is formed into a net shape without knots. (64 squares are formed in 1m units).

This is for experimental purposes and should not be exposed to high heat to prevent expansion and contraction. It's a gamble.

(2) Dimensions Between floats A: 0.5m Between floats and weight F: 0.3m Between weights F and float C: 0.1m Between floats C and weight G: 0.3m Between floats and weight G 20, 5m However, (the numbers shown above are estimated numbers when creating an actual 5m square fish cage net.

Condition of the fish cage net in Figure 9 Since the bellows were formed on the bottom net, the vertical reinforcing rope J between the float C and the weight G was slightly inclined inward (approximately 100), and the area of the bottom net was slightly narrowed.

FIG. 10 shows a state in which the fish pen net shown in FIG. 9 is subjected to a tidal current flowing in the direction of the arrow in FIG. 10 at a flow rate of 0.32 knots.

Due to the current, the vertical reinforcing rope J between the float C and the weight G is inclined by about 20 degrees on the a side, and is hardly inclined on the b side.

The bellows of the wall assembly and the bellows of the bottom net are formed together.

The bellows of the bottom net is deeper and the bottom area is narrower than in Figure 9.

In experiments using this current, it took about 1.5 knots for the wall bellows to collapse.

However, when the weight F and the float C became approximately horizontal, the bellows collapsed.

FIG. 11 is a diagram showing an experiment in which the weight G of the fish cage net in the state shown in FIG. 10 and the anchor 1 were connected with a rope to increase the bottom area.

The flow rate is 0.32 knots.

The vertical reinforcing rope J on the a side has a slightly arched shape between the float C and the weight G, and is inclined at about 10° toward the middle of the arch.

The bellows net of the present invention is automatically controlled against waves, wave height, tides, or raging typhoons by the expansion and contraction of the bellows, and the flexibility of the net protects the fishing ground from damage caused by wave force and water pressure.

Therefore, if this bellows type fishing net is used, it becomes possible to establish fishing grounds in the open sea, and it is possible to completely prevent the nuisance fish cage aquaculture pollution that is currently occurring nationwide at inland sea ports.

In addition, it is possible to raise healthy adult fish through pollution-free aquaculture.

Also, red tide is not a problem at all. Conventional fishing nets tend to break, so there is a limit to the size of fish cages, but using bellows nets eliminates this problem and expands fish cage fishing grounds into large fishing grounds. You can also do that.

Even with the current scale of cage aquaculture, it will be possible to overcome the raging typhoons in the open sea and achieve pollution-free aquaculture.

With partition nets, fishing can be done from the open sea or from the ocean floor, overcoming the raging typhoons and creating a large natural fishing ground for non-polluting aquaculture.

Fixed nets have tremendous effects, such as overcoming typhoons and buoyancy due to the bellows system, which reduces the daily work of lifting nets, which is hard work for fishermen.

[Brief explanation of the drawing]

Figure 1 is a plan view of a partition net installed in the open sea, Figure 2 is a partially cutaway enlarged perspective view of Figure 1, Figure 3 is a sectional view to explain the action of the bellows of the partition net, and Figure 4 The figure is a partially cutaway perspective view showing another embodiment of the partition net, FIG. 5 is a perspective view showing another embodiment of the present invention used in a fish cage net, and FIG. FIG. 7 is an explanatory diagram showing the action when a tidal current rushes into the partition net shown in FIG. 2, FIG. 8 is an explanatory diagram showing the action of the fish cage net shown in FIG. 5, FIGS. 9 to 11 are explanatory diagrams of a model experiment in which the formation of bellows in a cage net using the present invention was investigated. 11.13,15,17,40,42,481°482
．． 483,484,485...Float, 10°1
2.14, 16, 39, 41.47, ... weight, 35.36.37, 38, 461.462, 463° 464.465, 466.91.92, 93° 94.9
5,96,97... Lateral reinforcement rope, 18°34
・・・・・・Vertical reinforcement rope.

Claims (1)

[Scope of Claims] 1. A bellows type fishing net, characterized in that a row of weights and a row of floats are provided at intervals in a direction intersecting the net width direction in the middle of the fishing net. 2 A plurality of connecting reinforcing ropes are provided in the middle of the fishing net at intervals in a direction intersecting the net width direction, and a row of weights is provided on a predetermined connecting reinforcing rope among the plurality of connecting reinforcing ropes, and the weights A bellows type fishing net characterized in that a row of floats is provided on a predetermined connecting reinforcing rope among the connecting reinforcing ropes other than the connecting reinforcing ropes in which rows are formed. 3 A plurality of connecting reinforcing ropes are provided at intervals in the net width direction in the middle of the fishing net, and the plurality of connecting reinforcing ropes are provided in a weighted row in a direction crossing the net IJ force direction, and the plurality of connecting reinforcing ropes are A bellows type fishing net, characterized in that a row of floats is provided in a direction intersecting the direction of the net width at intervals from the row of weights. 4. A plurality of first connecting reinforcing ropes are provided at intervals in a direction intersecting the net width direction in the middle of the fishing net, and
A plurality of second connecting reinforcing ropes are provided at intervals to be connected to the first connecting reinforcing rope in a direction crossing the first connecting reinforcing rope, and a predetermined portion of the plurality of first connecting reinforcing ropes is provided. A bellows type fishing net characterized in that the connecting reinforcing ropes are provided with a row of weights, and a predetermined connecting reinforcing rope among the connecting reinforcing ropes other than the connecting reinforcing ropes provided with the row of weights is provided with a row of floats. . 5. In the middle of the fishing net, a plurality of first connecting reinforcing ropes are provided at intervals in a direction crossing the net width direction, and
A plurality of second connecting reinforcing ropes are provided at intervals in a direction intersecting the first connecting reinforcing ropes and connected to the first connecting reinforcing ropes, and the plurality of second connecting reinforcing ropes are provided with the mesh cloth. A bellows system characterized in that a row of weights is provided in a direction intersecting with the net width direction, and a row of floats is provided in the plurality of second connecting reinforcing ropes at intervals with the row of weights in a direction intersecting the direction of the net width. fishing net. 6. The bellows system according to claim 1, wherein a plurality of float rows and weight rows are provided, and at least one float row and one weight row are arranged alternately. fishing net. I. A bellows system according to claim 2, characterized in that a plurality of float rows and weight rows are provided, and at least one float row and one weight row are arranged alternately. fishing net. 8. The bellows according to claim 3, wherein a plurality of float rows and a plurality of weight rows are provided, and at least one float row and one weight row are arranged alternately. 9. A fishing net according to the present invention, wherein a plurality of float rows and a plurality of weight rows are provided, and at least one float row and one weight row are arranged alternately. A bellows-type fishing net as described in Section 10.
6. The bellows fishing net according to claim 5, wherein the rows of floats and the rows of sinkers are arranged alternately.