JP2018000098A - Float for stationary net, stationary net and usage of stationary net - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float for a stationary net in which the adjustment of buoyancy of a float can be performed easily and quickly, can be worked easily and quickly even on a boat floating on the sea immediately before stormy weather, and can prevent the damage of the stationary net without catch failure due to a net and a rope in the periphery of the float, and provide the usage of the stationary net and the stationary net.SOLUTION: A float 3 for a stationary net has a float body comprising a shell with a hollow in the inside, a recess 24 formed in a portion on the outside of this float body, a screw hole formed in this recess 24 so as to come in communication with the inside of the shell, and a lid 30 screwed in the screw hole and disposed in the recess so as to close the screw hole. Then, when extending the outer surface except the recess 24 of the float body and assuming a virtual outer surface surrounding this recess, the shape and size of the lid 30 and the recess 24 are set so that the lid 30 may be fitted in this virtual outer surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a float for a stationary network, a stationary network, and a method for using the stationary network, which can suppress damage caused by a large wave during aging.

  One of the Japanese coastal fisheries is stationary net fishery. This stationary net fishery catches fish using a fixed net that is fixedly installed at a specific location on the coast of Japan, and the most famous ones are the Toyama Bay and the anchored nets in Hokkaido.

  In recent years, with the increase in size of low pressure or typhoons, stationary nets have suffered significant losses due to waves caused by low pressure or typhoons. This loss is common in large stationary networks. A large stationary net has a complicated structure that cannot be easily landed at each time of storm. Even if it can be landed, it is only a limited part. Therefore, the damage of large stationary nets is expanding due to the emergence of storms due to large typhoons or bomb low pressures that have become larger in recent years. For example, in the fall of 2015 three times, 80% of the stationary nets in Hokkaido were damaged and suffered a great loss.

  Therefore, in recent years, with the advancement of materials and the like, various devices have been made so as not to be damaged even by some aging, such as a strong material structure that can withstand waves. In addition, a stationary net in a relatively shallow place is used so that it can be easily landed.

  However, a stationary net installed at a deep position where the average depth exceeds 40 m needs to use a sturdy net or rope according to the depth, and is a very large device. Since it is such a large-scale device, landing work in a short time is difficult. As countermeasures for nets that cannot be landed, the influence of waves is reduced by partially removing the float in the upper layer to reduce buoyancy. Although this is the most effective measure, it is difficult to do such work in a short time before the storm occurs. A storm will occur.

  In addition, although net companies or related industries are researching tidal currents and deposits in order to increase fishing efficiency, measures to prevent damage from damage due to storm waves and the shape of the seabed, etc. The current situation is that the local fishermen have been handed down from generation to generation due to the differences in conditions.

  Some float-sink type floats adjust the buoyancy by press-fitting air. However, this type of float is often relatively large and has a problem that it is difficult to use in a stationary network that uses many small floats.

  Moreover, as a conventional buoyancy adjustment type float, it is a float of a hollow structure in which the inside is partitioned into a plurality of chambers by a plurality of partition plates, and in a body portion or a mirror plate portion close to the mirror plate, at a position referred to relative to the float body, There has been proposed one in which two or more water or air ports are provided so that water can be discharged or injected into the float (Patent Document 1). In Patent Document 1, the buoyancy of the float can be adjusted by controlling the amount of water introduced into the float, thereby avoiding or reducing the influence of wave force and wave as much as possible ( It is described that it can not be shaken by waves).

Japanese Utility Model Publication No. 5-51066

  However, since the buoyancy adjustment type float described in the above-mentioned Patent Document 1 is provided with two or more air or water outlets, the protrusions at the outlets make it difficult to work on the float. Yes. In particular, since this buoyancy adjustment is carried out on the ship at sea when aging occurs, the work for buoyancy adjustment is difficult, and the net or rope surrounding the stationary net is caught by the protrusions, In spite of the fact that it is in the middle of aging, the working time becomes long, and eventually it becomes difficult to adjust buoyancy during aging.

  The present invention has been made in view of such a problem, and can easily and quickly adjust the buoyancy of a float, and can easily and quickly work on a ship floating on the sea just before aging. Another object of the present invention is to provide a float for a stationary network, a stationary network, and a method for using the stationary network, which can prevent damage to the stationary network without being caught by the mesh and rope around the float.

The float for a stationary network according to the present invention is
A float body with a hollow shell inside,
A recess formed in a part of the outer surface of the float body;
A screw hole formed in this recess to communicate with the inside of the shell;
A lid disposed in the recess so as to be able to close the screw hole by being screwed into the screw hole;
Have
The shape and size of the lid and the recess are set so that the lid fits in the virtual outer surface when the outer surface excluding the recess of the float body is extended to assume a virtual outer surface that wraps the recess. It is characterized by being.

The stationary network using the stationary network float according to the present invention,
With hand net and trunk net,
Supported by a plurality of stationary net floats, the hand net and the trunk net are held in the sea,
A small float for a stationary net consisting of a spherical shell in which the float body has a spherical shape;
The float main body has a cylindrical cylindrical shell and a large float for a stationary net formed of hemispherical hemispherical shells provided at both ends in the longitudinal direction of the cylindrical shell.

The method of using the stationary net according to the present invention is as follows:
When time is expected,
For part or all of the stationary net float, remove the lid and open the screw holes in the float body,
After the aging is settled, seawater is discharged from the float main body from which the lid is removed, and the lid is attached.

  According to the present invention, the buoyancy adjustment of the float can be performed while the float is floating on the sea surface, and the buoyancy loss work can be performed quickly and easily even in a short time before aging. It can be carried out. Further, this float buoyancy adjustment work can be easily performed even on a small work boat not provided with a net lifting machine. And by removing the lid | cover of a predetermined float, seawater can be inject | poured into this float only by a wave exposing the upper surface of a float, and a special injection | pouring operation | work is unnecessary. Float restoration work can be done in a short time and easily with a small work boat and a small drainage pump using a pump to discharge the seawater inside the float and attach a lid. . In addition, since the lid fits inside the virtual outer surface and there is no protrusion from the virtual outer surface, there is no risk that the net or rope existing near the float will be caught, and there is no risk of breakage of the float and net or rope due to this catch. .

It is a perspective view which shows the float 3 of the state which mounted | wore the lid | cover. It is a perspective view of the float 3 of the state which similarly mounted | wore with the lid | cover. It is a front view of the float 3 of the state which mounted | wore with the cover similarly. It is a side view of the float 3 of the state which mounted | wore with the cover similarly. It is a top view of the float 3 of the state which similarly mounted | wore with the lid | cover. It is a perspective view which shows the float 3 of the state which removed the cover. It is a front view of the float 3 of the state which similarly removed the cover. It is a side view of the float 3 of the state which similarly removed the cover. It is a perspective view which shows the large sized float 13 of the state which mounted | wore the lid | cover. It is a perspective view of the large sized float 13 of the state which similarly mounted | wore with the lid | cover. It is a front view of the large sized float 13 of the state which similarly mounted | wore with the lid | cover. It is a side view of the large-sized float 13 of the state which similarly mounted | wore with the lid | cover. It is a top view of the large sized float 13 of the state which similarly mounted | wore with the lid | cover. It is a perspective view which shows the large sized float 13 of the state which removed the cover. It is a front view which similarly shows the large sized float 13 of the state which removed the cover. It is a side view which shows the large sized float 13 of the state which similarly removed the cover. 1 is a perspective view showing an example of a stationary net 1. FIG. It is the same top view. It is the side view similarly. It is the same front view. It is a side view which shows the state of the stationary net | network at the time of aging.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. 17 is a perspective view showing a stationary net 1 as an example, FIG. 18 is a plan view, and FIG. 19 is a side view. The planar hand nets 1a, 1b, and 1c are arranged vertically so as to extend from the land toward the offshore, for example, over three stages. Trunk nets 11a, 11b, and 11c are installed at the offshore ends of the hand nets 1a, 1b, and 1c of the respective stages. The trunk nets 11a, 11b, and 11c form a box shape in which the upper surface and the portions in the vicinity of the hand nets 1a, 1b, and 1c on the side surfaces are opened, and the longitudinal direction of the box is relative to the hand nets 1a, 1b, and 1c. It is arranged to be vertical. Therefore, the fish that has been prevented from moving forward by the hand net 1 (1a, 1b, 1c) enters the trunk net 11 from the opening 5 on the hand net 1 side of the trunk net 11 (11a, 11b, 11c). Captured in the net 11.

  The upper end of each hand net 1 is suspended from a rope 6 called a plurality of ropes 7, and the rope 6 is installed on the sea surface by the buoyancy of a small float 3. A weight 2, which is said to be earthen, placed on the seabed is connected to an appropriate place of the rope 6 via a rope 8. This prevents the hand net 1 from moving due to wave power. On the other hand, the lower end of each hand net 1 is provided with a chain 9 which is said to be attached along the lower end. The chain 9 serves as a weight, and the hand net 1 maintains a vertical posture against wave forces. Are arranged.

  The trunk net 11 has a box shape, and a rope 12 called a mold is stretched around the upper end edge of the box in a rectangular shape so as to surround the trunk net 11. Is connected by a rope 14 so that the trunk net 11 is supported by the rope 12. A large float 13 is attached to the rope 12, and a small float 3 is attached to the upper end edge of the trunk net 11. The large float 13 and the small float 3 allow the trunk 12 to The net 11 is supported so as to float on the sea. The rope 12 supporting the trunk net 11 is connected to the weight 2 placed on the seabed via a rope 8 at an appropriate position. The trunk net 11 is moved by the wave force via the rope 12. Without being held in that position.

  Next, the floats 3 and 13 will be described. FIGS. 1 to 8 are views showing a small float 3, FIGS. 1 to 5 are views showing a state where a lid is attached, and FIGS. 6 to 8 are views showing a state where the lid is removed. . 3 and 7 are front views, FIGS. 4 and 8 are side views, FIG. 5 is a top view, and FIGS. 1, 2 and 6 are perspective views. The float 3 is a spherical shell 21 (float body) whose outer shape is entirely spherical and whose inside is hollow. A part of the outer surface of the spherical shell 21 is provided with a pair of locking portions 22 for attaching the float 3 to the rope. The locking portion 22 locks the rope. A hole 23 is formed for this purpose. A belt-like concave portion 24 is formed on the outer surface of the spherical shell 21 on the opposite side of the locking portion 22. The bottom surface of the recess 24 is a flat surface, and a lid 30 is disposed at the approximate center thereof. That is, a screw hole 33 is formed at substantially the center of the flat surface of the recess 24, and a screw part 34 formed on the lower surface of the lid body 31 of the lid 30 is screwed into the screw hole 33. . A flat handle 32 is formed on the upper surface of the lid body 31 of the lid 30, and the lid 30 is rotated by gripping the handle 32, so that the screw portion 34 is screwed into the screw hole 33. The lid 30 is removed. The outer surface of the spherical shell 21 of the float 3 is a spherical surface except for the concave portion 23. When a spherical surface having the radius centered on the center of the spherical shell 21 is a spherical virtual surface, the lid 30 is attached to the concave portion 24. In this case, the shape and size of the lid 30 and the spherical shape and size of the recess 24 are determined so that the upper end of the handle 32 of the lid 30 is within this spherical virtual plane. This spherical virtual surface becomes a virtual outer surface that extends the outer surface excluding the concave portion 24 of the spherical shell 21 as the float body and encloses the concave portion 24.

  9 to 16 are views showing the large float 13, FIGS. 9 to 13 are views showing a state where the lid is attached, and FIGS. 14 to 16 are views showing a state where the lid is removed. . 11 and 15 are front views, FIGS. 12 and 16 are side views, FIG. 13 is a top view, and FIGS. 9, 10 and 14 are perspective views. The float 13 has an overall hemispherical outer shape, and has hollow hemispherical shells 41 and 42 having hollow interiors and a hollow cylindrical shell 43 having hemispherical shells on both sides of the cylindrical shell 43. 41 and 42 are arranged (float body). A concave portion 44 extending in the lateral direction is formed at substantially the center in the longitudinal direction of the cylindrical shell 43, and the bottom surface of the concave portion 44 is flat. A lid 30 is provided in the approximate center of the recess 44. The screw portion 34 on the lower surface of the lid body 31 of the lid 30 is screwed into the screw hole 33 formed in the recess 44, and the handle 32 protruding from the upper surface of the lid body 31 of the lid 30 is picked. By rotating the lid 30, the lid 30 can be attached to and removed from the screw hole 33. Note that a locking portion 22 for attaching the float 13 to the rope and a locking hole 23 are provided on the outer surfaces of the hemispherical shells 41 and 42. In the float 13, the outer surface of the cylindrical shell 43 is a cylindrical surface except for the concave portion 44, and a cylindrical surface having a radius centered on the center of the cylindrical shell 43 is a cylindrical surface virtual surface. When the lid 30 is attached, the shape and size of the lid 30 and the shape and size of the concave portion 44 are determined so that the upper end of the handle 32 of the lid 30 is within this cylindrical virtual plane. The virtual surface of the cylindrical surface and the outer surfaces of the hemispherical shells 41 and 42 on both sides thereof are virtual outer surfaces that extend from the outer surface excluding the cylindrical shell 43 serving as the float main body and the concave portions 44 of the hemispherical shells 41 and 42 on both sides thereof and wrap around the concave portion 444. It becomes.

  In addition, it is preferable to use the material which does not change by corrosion other than a metal like the plastics etc. which comprise the floats 3 and 13. FIG.

  Next, the operation of the stationary network float configured as described above will be described. The interiors of the floats 3 and 13 are hollow, and the interiors of the floats 3 and 13 are sealed from the outside air by attaching the lid 30. Note that a packing or the like may be provided on the lower surface of the lid main body 31 of the lid 30 so that the space between the screw hole 33 and the lid main body 31 is reliably shielded. Thereby, the floats 3 and 13 float on the sea surface. Therefore, the upper end of the hand net 1 is supported by the small float 3, and the upper end of the trunk net 11 is supported by the large float 13 and the small float 3. Accordingly, as shown in FIG. 19, when the sea surface is calm, the three-stage hand net 1 from the first floor to the third floor is stretched in the sea water from the land to the offshore, and the fish 11 Captured within.

  In this stationary net, when the wave becomes intense and becomes timed, as shown in FIG. 21, the floats 3 and 13 floating on the sea surface generate a large swell due to the sea surface wave, and the hand net 1 and the trunk net 11 etc. Will be destroyed. These floats 3 and 13 are attached at substantially equal intervals, for example, at intervals of 1 to 1.5 m so as not to sink due to the weight of the nets and deposits or tidal currents. Further, the large float 13 is attached at a ratio of 3 to 4 at the four corners of the mold in a state where the rope 12 is stretched in a rectangular shape. When the waves become large, the hand net 1 and the trunk net 11 are lifted up together with these floats 3 and 13, and when the allowable range is exceeded, the mold and the rope 8 connecting the net 1 and the weight 2 on the seabed are cut. Or the weight 2 is dragged. Eventually, the portion that was supported by dividing the entire stationary network can no longer be held, and the surrounding ropes 6, 7, 8, and 12 and the weight 2 and the like are successively damaged. Even if the magnitude of the aging is similar, if the aging continues for a long time, the damage will increase and the stationary net may be leaked.

  Therefore, at the time when aging is expected, an operator who has boarded a small boat at sea opens the lids 30 of some floats 3 and 13 that suspend the hand net 1 and the trunk net 11, for example. In this case, the lid 30 can be removed simply by picking the handle 32 of the lid 30 and rotating the lid 30, and the lid 30 can be removed easily and quickly. Further, in the illustrated example of FIG. 1 and the like, since the lid 30 is disposed on the opposite side of the locking portion 22 for fixing to the net, the lid 30 faces upward. Removal work is easy.

  Then, the floats 3 and 13 from which the lid 30 has been removed enter water inside the spherical shell 21 and lose buoyancy. In this case, every time the wave passes through the screw hole 33, the seawater gradually enters the inside of the spherical shell 21 and the like and automatically loses buoyancy. It is unnecessary. In this way, the buoyancy of the entire hand net 1 and the trunk net 11 is adjusted by losing the buoyancy of some or a considerable number of the floats 3 and 13 attached to the hand net 1 and the trunk net 11. Can do. Thereby, the buoyancy of the whole float 3 and 13 can be adjusted, and all of the hand net 1 and the trunk net 11 can be hidden under the sea surface together with the floats 3 and 13 in which the buoyancy remains. Therefore, damage to the stationary net can be prevented by vertical movement of the sea surface due to aging.

  After the time has settled, the buoyancy of the float that has lost its buoyancy is recovered by discharging seawater from the inside of the floats 3 and 13 from which the lid 30 has been removed with a pump or the like and attaching the lid 30 again. And the function as a stationary network can be restored. Therefore, unlike the conventional case where the float is mechanically removed from the net to weaken the buoyancy and lighten the influence of the waves, this embodiment allows quick operation even during a short time of offshore work before aging. In addition, the buoyancy of a considerable number of floats 3 and 13 can be lost. In particular, the large floats arranged at the corners of the mold are firmly attached to the mold, and it is extremely troublesome to mechanically remove the large floats as in the prior art. However, in this embodiment, the large float 13 can easily and quickly lose buoyancy by simply removing the lid 30. Moreover, the floats 3 and 13 whose buoyancy has been lost at one end can also be restored to buoyancy simply by attaching the lid 30 after the seawater that has entered the interior is discharged by a pump or the like. Therefore, the stationary network can be restored quickly.

  Moreover, in the present embodiment, the lids 3 and 13 of the floats 3 and 13 are accommodated inside the virtual outer surface (the spherical virtual surface and the cylindrical virtual surface). For this reason, a net or a thin rope existing in the vicinity of the floats 3 and 13 is not caught by the lid 30. In addition, the floats 3 and 13 are usually subjected to installation work and tidying work of the stationary net while being locked to the rope. Even in such a case, since the lid 30 is within the virtual outer surface, it is possible to prevent the lid 30 from being damaged due to rubbing and collision of a rope or the like. Since the lid 30 is provided with a handle 32, the lid 30 can be easily rotated by picking the handle 32, and a work with a bare hand or a simple tool is possible. .

  By manufacturing the floats 3 and 13 using a material such as plastic including the lid 30, no corrosion occurs when a metal material is used, and durability is improved. In the present embodiment, the buoyancy of the floats 3 and 13 can be quickly and easily lost immediately before the occurrence of aging. The buoyancy loss at the time of aging can be performed while securing the buoyancy necessary for supporting the 1 and the trunk net 11. For this reason, the manufacturing cost of a float can be reduced by the miniaturization.

  The floats 3 and 13 are newly provided with a lid 30, but the virtual outer surface can be the same size and shape as a conventional float, so it is easy to use and has a work pattern similar to the conventional one. Can be installed.

1, 1a, 1b, 1c: hand nets 11, 11a, 11b, 11c: trunk net 2: float 3: float 5: openings 6, 7, 8, 12: rope 13: (large) float 21: spherical shell 22: Locking part 23: Locking hole 24: Recess 30: Lid 31: Lid body 32: Handle 33: Screw hole 34: Screw part 41, 42: Hemispherical shell 43: Cylindrical shell 44: Recess

Claims (3)

A float body with a hollow shell inside,
A recess formed in a part of the outer surface of the float body;
A screw hole formed in this recess to communicate with the inside of the shell;
A lid disposed in the recess so as to be able to close the screw hole by being screwed into the screw hole;
Have
The shape and size of the lid and the recess are set so that the lid fits in the virtual outer surface when the outer surface excluding the recess of the float body is extended to assume a virtual outer surface that wraps the recess. A float for a stationary network, characterized in that In the stationary network using the floating network float according to claim 1,
With hand net and trunk net,
Supported by a plurality of stationary net floats, the hand net and the trunk net are held in the sea,
A small float for a stationary net consisting of a spherical shell in which the float body has a spherical shape;
A stationary net characterized in that the float main body has a cylindrical cylindrical shell and a large float for a stationary net formed of hemispherical hemispherical shells provided at both longitudinal ends of the cylindrical shell. In the usage method of the stationary net | network of Claim 2,
When time is expected,
For part or all of the stationary net float, remove the lid and open the screw holes in the float body,
A method of using a stationary net, characterized in that after the aging has settled, seawater is discharged from the float body from which the lid has been removed, and the lid is attached.

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