JPH05292855A - Sink-and-float pipe for stationary net - Google Patents

Abstract

PURPOSE:To obtain the subject pipe capable of guiding a fish school into a bag net while preventing the escape of the fish by attaching a flexible sink-and-float pipe having plural bubble-ejection holes to a bottom net and a wing net of a stationary net in a state to enable sinking and flotation and connecting the pipe with a compressed air source for forming bubbles. CONSTITUTION:The objective flexible sink-and-float pipe 7 has plural ejection holes 8 having proper diameter and opened at proper positions to generate bubbles. A plurality of the pipes 7 are parallelly attached to the bottom net and the wing net of a stationary net 1 having right and left bag nets 5, a leader net 2, a circling net 3 and a non-return sloped net 4. The pipes are extended in the direction perpendicular to the longitudinal direction of the stationary net. The sink-and-float pipe 7 attached to the sea-bottom member is connected to a compressed air source 11 such as compressor and air is supplied to the pipe from the inlet part and transferred to the fish- capturing part through a solenoid valve 10 and an air-hose 9 while switching the air pressure at regular intervals. Bubbles are ejected from the ejection holes of the sink-and-float pipe 7 and fish schools are guided into the bag net 5. The escape of the fish is prevented by the threatening effect of the bubbles in combination with the sound generated by the bubbles.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Many of the fish that come to the coast, such as yellowtail, tuna, sardines, mackerel, salmon, trout, etc., migrate migratory seasonally and regionally year by year.
Taking advantage of such characteristics of fishes along the coast, set nets are set over a certain water surface suitable for the visiting of fish schools for a considerable period of time, and fishing is performed by these set nets. The present invention is
The present invention relates to a floating / sinking pipe for guiding a fish school to the set net and for floating the set net, which enables the fish net to be pulled into the fish catching side without manpower when guiding and floating the fish group. Is. And, in detail, blocking the way of the school of fish with a fence, without scattering this,
Change the direction of movement and move the fish school to the net net (enclosure net, climbing net,
When guiding the three parts of the box net collectively, first raise bubbles so as to block from the part of the fence net that connects to the net part to the open part of the net part. At about the same time, the float-sink pipe starts to float, and this is sequentially switched from the surrounding net with the net to the rising net and then to the box net, or even to the safe net, while raising the bubbles, at the same time, the float-sink pipe also floats, The present invention relates to a settling pipe for a set net that can guide a school of fish by guiding a school of fish to a box net by floating the settling pipe to simultaneously guide the school of fish.

[0002]

2. Description of the Related Art When lifting a box net, for example, compressed air is supplied to a long floating body, and the buoyancy thereof is used to gradually levitate the net from the climbing section side. Then, the buoyancy of the floating body is further applied to the box net portion through the net, thereby significantly reducing the lifting labor and man-hours of the box net portion. In order to achieve this effect, there is conventionally a net-meshing device for a stationary net in which a net is placed below the box net part of the stationary net, and a flexible long floating float which can supply and exhaust gas is attached to the net. (Japanese Patent Laid-Open No. 60-10213
No. 0).

[0003]

However, in the above-mentioned conventional technique, in the net-meshing device for a stationary net equipped with a flexible long floating body capable of supplying and discharging gas, forced expansion and contraction due to supply and discharge of gas. Both the sinking hose and the weight extend in a direction perpendicular to the axis of the main body part, and when these settle down the long floating sediments, they cause the long floating sediments to sink from their mounting side. Complete exhaust is guaranteed without leaving any gas inside. To describe this sinking situation in more detail, the floating posture of the long floating sinker is
Because of the presence of the weight, it always takes a downward position, so when exhausting from a long floating sinker, the forced sinking hose that receives the largest water pressure is first exhausted, which increases buoyancy. The reduced weight exerts its weight directly on the end of the body portion, resulting in a slight sinking of the body portion end. Therefore, in the subsequent evacuation, the body part is gradually evacuated from the submerged part, which results in uniform subsidence of the long floating sedimentation body without gas remaining in the bag-shaped part. Both the forced sinking hose and the weight that expand and contract due to the extension in the direction perpendicular to the axis of the main body part cause the sinking of the long float / sink from the attachment side of the long float / sink. , The forced sinking hose and the weight must be installed at a right angle, and in practice it cannot be easily settled,
To make the settling easier, the weight should be heavier, but since it must be levitated, this balance is very difficult and impractical. Moreover, since the long floating body is sealed, it must be made of a strong material that is thick in terms of strength. Therefore, there is a problem that the device becomes very expensive. In addition, in view of the current lack of manpower in the fishery, conventional fixed nets consist of fence nets, climbing nets, box nets or even drop nets. Therefore, maintain each one and secure manpower to net all of them. There was a problem that was difficult. In view of this point, the present invention has a simple structure, and by forming an appropriate number of discharge holes of an appropriate diameter in a flexible floating / sinking pipe, the strength of the floating / sinking pipe itself need not be considered so much. is there. In addition, since the discharge hole is bored, the gas can smoothly flow in and out of the discharge hole when the pressurized gas is supplied and discharged, so that the floating and sinking action can be performed very smoothly. Moreover, since air bubbles can be formed by also using the discharge holes, it is possible to guide the school of fish to a box net for catching the stationary net or a drop net.
Also, by using a floating / sink pipe with a discharge hole, a fixed net with a box net directly from a fence net that does not require an enclosing net or climbing net can secure a large capture amount compared to the conventional one. The purpose is to provide a floating pipe.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and it is attached to the bottom net and side net of a stationary net so as to float and sink, and at the same time, pressurized gas is formed so as to form bubbles. A technical means was adopted in which a suitable number of discharge holes having an appropriate diameter were formed at appropriate positions of the flexible floating / sink pipe connected to the supply source.

[0005]

According to the present invention, by adopting the above technical means, the floating and sinking pipes are expanded and contracted by supplying and discharging the pressurized gas with a simple structure, and at the same time when the pressurized gas is supplied,
While the pressurized gas is ejected from the discharge hole formed in the floating and sinking pipe to form bubbles, the floating and sinking pipe floats.
The floating and sinking pipes are connected to the adjacent floating and sinking pipes by a net, and when the floating and sinking pipes supplied with pressurized gas start to float, the net between the sinking and sinking adjacent floating and sinking pipes is slanted. Then, the floating and sinking pipes float while approaching each other gradually, and at the same time, the bubbles gradually approach in the overlapping direction, and at the same time, the sound made when the pressurized gas is ejected from the discharge hole and the bubbles By doing so, it is possible to reliably intimidate the school of fish.

[0006]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The embodiment shown in FIGS. 1 and 2 is an example of a stationary net, and is a schematic plan view showing a general stationary net 1 having a box net 5 or a drop net (also referred to as a safe net) on the left and right. The stationary net 1 has a fence net 3 (moving part) provided with a net, a climbing net 4, and a box net 5 as a longitudinal direction, and the net 3 is provided with each net. Climbing net 4, box net 5
The width direction is a direction orthogonal to the longitudinal direction so as to cross the lengthwise direction, and the floating and sinking pipes 7 that also generate bubbles at appropriate intervals in the width direction are attached in parallel to the bottom net and the side net of a plurality of stationary nets. It is arranged on the sea bottom (it is needless to say that the floating and sinking pipe 7 and the net have the same function as long as they are not directly attached to each other if they are not separated from each other). The plurality of floating and sinking pipes 7 are sequentially switched to the longitudinal direction by a solenoid valve 10 at regular time intervals, and a group of fishes guided by the mesh net 2 is lifted from the inlet side of the enclosure net 3 provided with a net. , And to the box net 5, the right and left are sequentially switched and moved at an appropriate speed (to the extent that bubbles are not interrupted). This is because the group of fish blocked and guided by fence 2
When the fish finder 6 or the like detects this by swimming into the fence net 3 provided with a net, the fence net 3 provided with the net is first detected.
If the floating and sinking pipe 7 is arranged so as to block the entrance of the fish, the school of fish that loses its escape area due to the bubbles from the floating and sinking pipe 7 will swim in the enclosure net 3 provided with a net. .. A plurality of floating and sinking pipes 7 arranged in the width direction of the stationary net 1 described above are provided with a pressure gas source, for example, a compressor 11, a cylinder or the like, from the inlet side to the fish catching side. The air bubbles are generated from the floating and sinking pipe 7 by switching at regular intervals via the air supply hose 9 and the air supply hose 9, and the bubbles rise like a curtain. The rising air bubbles are guided and captured in the box net 5 so that they move by sequentially switching from the entrance side of the enclosure net 3 provided with a net to the rising net 4 and the box net 5. In order to generate the bubbles, pressurized gas is sent to the floating / sinking pipe 7 so that the bubbles rise while generating sound from the discharge holes 8 formed in the floating / sinking pipe, and as a result, a curtain of bubbles is formed. At the same time, the up and down pipe 7 floats. Since the floating / sink pipe 7 to which the pressurized gas is fed is attached to the bottom net and the side net of the stationary net 1, the bottom net is raised and at the same time the side net is also raised. At this time, the bubbles are formed while rising so as to approach the adjacent floating / sink pipe 7 to which the pressurized gas is not fed. When the pressurized gas is sent to the adjacent floating and sinking pipes 7 at the same timing, the bubbles move to the left and right in a state of chasing the school of fish with almost no breaks. Although the case of application to the conventional stationary net has been described above, as described in the problem to be solved by the invention, when the floating pipe of the present invention is used, the surrounding net 3 and the rising net 4 are removed and the net is directly attached to the fence net. Even with a simple stationary net with a box net,
It is possible to catch a school of fish without any hindrance. The floating / sinking pipe 7 is a flexible pipe having a large number of air bubble discharge holes 8 formed in a hollow cylindrical structure, and made of synthetic resin, synthetic rubber (for example, Neodericon R made of Kuraray plastic) or the like. Made of The diameter of the floating / sinking pipe 7 and the diameter of a large number of the bubble discharge holes 8 are designed so that when the pressurized gas is sent, the bubbles can be formed and float at the same time. It has various lengths in relation to the stationary net 1 that is installed, and the length determines the interval at which bubbles are formed, the diameter of the discharge holes 8 and the diameter of the floating pipe 7 itself. Is. For example,
The diameter of the floating pipe 7 itself is 50 mmφ, the buoyancy is about 2 kg per 1 m, and the bubble discharge hole 8 is a 0.8 mmφ diameter hole, and three bubbles are formed per 1 m to form bubbles. Moreover, it can be lifted and lowered. Moreover, the connection with the pressurized gas supply source may be provided at an appropriate number of positions at one end, both ends, or every predetermined section in the axial direction in order to uniformly distribute the bubble discharge. In order to improve the condition, it is selected by design depending on the conditions such as water depth. Although there are various kinds of general set nets 1, for example, the set net fishing method composed of fence nets 2, enclosure nets 3, climbing nets 4 and box nets 5 (there are also some nets provided with drop nets after this), Blocking the approach of the school of fish with a fence net 2 to guide the school of fish to the surrounding net 3, and a part of the school of fish rises to the net 4, box net 5
It swims in and enters. This is only part of the school of fish, and most of them do not go to the box net 5 and the net 3
I also escape from. Almost all the school of fish that has entered this at least into the surrounding net 3 will enter the box net 5 by utilizing the threatening effect of bubbles and the sound generated when they spout from the discharge hole 8 of the ups and downs pipe 7. Then, while chasing the school of fish, the bubbles are switched and moved so that the escape direction is directed to the box net 5. As a result, the school of fish enters the box net 5, and this is confirmed by the school of fish finder 6 or the like. At this time, the amount of pressurized gas supplied,
The floating / sinking pipe 7 floats when air is sent and sinks when the air is stopped in relation to the amount of air discharged. In particular, even if the floating state is not canceled temporarily due to the tide, since the discharge hole 8 is bored in the floating / sinking pipe 7, the air that controls levitation always escapes, and as a result, it sinks. .. Further, when the pressurized gas is sent, since the discharge hole 8 is formed in the floating / sinking pipe 7, the pressure resistance of the floating / sinking pipe 7 itself is taken into consideration, as compared with the conventional long-length floating / sinking body. Is rarely needed. Furthermore, it is possible to balance the levitation and the sinking by attaching a weight to the sinking / sinking pipe 7 in order to settle it. Moreover, because the discharge hole 8 is formed in the floating / sink pipe 7,
A large amount of air is required, and it is less problematic to directly use the compressor 11 instead of the air tank. Next, to give a general description, a remote control buoy provided with a compressor 11, an air tank, a switching solenoid valve 10 and the like is provided at an appropriate location near the stationary net 1, and the compressor 11,
Connected to an air tank, an air supply hose 9 is arranged along a stationary net 1 via a float (this float is provided with a switching solenoid valve 10), and an appropriate portion is fixed by an anchor via a wire. I am doing it. It is arranged so that pressurized gas can be jetted from the air supply hose 9 to each floating / sinking pipe 7 via a switching electromagnetic valve 10 provided on each float. A check valve is provided at an appropriate location on the end of each floating / sinking pipe 7 on the side of the air supply hose 9, and an air trap is provided at an appropriate location on the tip end of the floating / sink pipe 7 so that bubbles can rise quickly. Further, not only one remote control buoy provided with the compressor 11 and the air tank but also a plurality of remote control buoys are provided. One remote air supply hose 9 is provided in the longitudinal direction of the stationary net 1, and at the same time the remote control buoy is also provided. By providing each one, it is possible to more accurately switch the bubbles. Further, it goes without saying that the places where the remote control buoy, the switching solenoid valve 10 and the compressor 11 are installed can be appropriately changed in design. When the fish finder 6 detects that a fish school has entered the box net 5, the fish finder 6 sends a signal to the land radio station, which receives the signal and sends the signal to the compressor 11 and the switching solenoid valve 10 to the land radio station. A command is issued from the switch to sequentially switch and move the bubbles at fixed time intervals.
Further, it goes without saying that the structure of the floating and sinking pipe 7, the performance of the compressor 11, the remote automatic control method of the system, etc. can be designed and combined in various ways to save labor and labor. This is because the discharge / sink 8 is formed in the floating / sinking pipe 7, so that the floating / sinking action is performed smoothly and surely, so that the above automation is possible. Since the fish finder, the compressor, the switching solenoid valve, and each device and system for remote operation with the land radio station may be designed and installed by combining various conventionally known devices, detailed description thereof will be omitted. In addition, the facility direction of the above-mentioned floating and sinking pipe 7 is set parallel to the longitudinal direction (two facilities are provided along at least the bottom ridge portions on both sides, and several facilities are increased in parallel in the central portion depending on the size of the stationary net). In the case where the box net 5 is provided on the left and right as in the present embodiment, by feeding the pressurized gas to the floating and sinking pipe 7 from approximately the center,
While floating from the center, lift up and down pipes 7 on both left and right sides
Is levitated, so this kind of usage is also possible.
Further, in the case of the stationary net 1 in which the box net 5 is only on one side, by feeding pressurized gas from the opposite side of the box net 5 to the floating / sink pipe 7, the air net is also sent to the box net 5 side from the floating net. 7
Levitates. In the above description, the floating / sink pipe 7 is provided with the discharge hole 8. However, in place of this, a discharge hole is formed in the air bag, and this is attached to the bottom net of the stationary net,
Even if the pressurized gas is sent or cut off to float or sink, the same action is achieved. Besides, it goes without saying that the present invention can be applied to various kinds of nets that need to be lifted (for example, live state nets).

[0007]

According to the present invention, the following effects can be obtained based on the above configuration. (1) By attaching the floating and sinking pipes having the discharge holes, it is possible to configure the stationary net with a mesh net and a box net, so that the cost of the stationary net itself can be reduced. In addition, the manpower required for lifting the net can be reduced. Further, it has an extremely excellent effect that the management of the enclosure net and the climbing net becomes unnecessary. (2) In the set-net fishing method in which the fish net is blocked by the fence net and the fish school is surrounded and guided into the net, a floating / sinking pipe having a discharge hole is provided, and bubbles are formed while the floating / sinking pipe is floated. Due to the moving movement of the bubbles, the sound generated when the bubbles are ejected from the floating and sinking pipe, and the intimidating effect of the bubbles, the school of fish guided to the enclosure net can be guided to the box net with almost no escape. Moreover, since the floating / sinking pipe floats, the set net locked by the floating / sinking pipe also floats, so that the trouble of the net can be saved and the catch amount can be increased. (3) It also contributes to the improvement of the environment of the fishing grounds where a device for guiding fish for a fixed net using bubbles is installed. That is, as the bubbles are generated, the surrounding seawater simultaneously forms an upward flow, which promotes the exchange of seawater in the water area and improves the water quality. In addition, nutrients deposited in the bottom layer will be transported to the upper layer, and various plankton, which will be the food for fish, will be generated, forming a good fishing ground. At the same time, it contributes to the destruction of the thermocline, which causes red tide.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a floating and sinking pipe in the embodiment.

FIG. 3 is a perspective view of a floating and sinking pipe of the present invention.

[Explanation of symbols]

1 ... fixed net 2 ... fence net 3 ... enclosure net 4 ... climbing net 5 ... box net 6 ... fish finder 7 ... floating pipe 8 ... discharge hole 9 ... air supply hose 10 ... switching Solenoid valve 11 Compressor

Claims (1)

[Claims] 1. A flexible floating pipe, which is attached to a bottom net and a side net of a stationary net so as to float and sink, and at the same time, is connected to a pressurized gas supply source so as to form bubbles,
A floating net for a fixed net, comprising a proper number of discharge holes having an appropriate diameter.