JPH01128733A - Mechanism for holding position of middle layer floating fish gathering place - Google Patents

Abstract

PURPOSE:To always float a fish gathering place to a given water depth with low buoyancy, be feeding a gas from a pressure tank to a buoyancy regulation tank with a valve operating apparatus operating according to a variable water pressure. CONSTITUTION:A valve operating apparatus 5 operating according to a variable water pressure is connected to the upper part of a pressure tank 2 to communicate the valve operating apparatus 5 through an annular pipe 10 with a buoyancy regulation tank 3. If a floating fish gathering body 1 is sunk below the set water depth, the gas according to the extent of variability is fed from the pressure tank 2 to the buoyance regulation tank 3 with the valve operating apparatus 5 to increase buoyancy.

Description

DETAILED DESCRIPTION OF THE INVENTION: Industrial Application Field The present invention relates to a mid-layer pelagic reef that is moored to an anchor on the seabed and floated at a mid-depth position in the water.

2. Conventional technology and problems: In the conventional mid-level floating fish reef, the main body of the fish reef with a floating body is moored to an anchor on the seabed via a mooring line, and is kept at a predetermined water depth suitable for fish growth. It is known that a buoy is connected to a mooring lobe with one end fixed to the main body to indicate the installation position.

Conventional mid-level floating fish reefs become heavy when they are left in place for long periods of time due to the accumulation of marine life (shells, seaweed, etc.), so the floating bodies must have a large buoyancy in advance.

Therefore, a large tensile force is constantly acting on the seabed anchor and the mooring line.

Furthermore, if the external force of waves during rough weather is added to the constantly acting tensile force, there is a risk that the mooring line will break, and in this case, there is a risk that the reef body will rise above the sea surface due to buoyancy and collide with the vessel. .

Therefore, as a means to prevent the mooring line from being cut and the reef body from rising to the sea surface, it is disclosed in Japanese Patent Publication No. 58-20241, and as shown in Figure 5, the pressure inside the floating body is made equal to the water depth pressure at which it is installed. When the mooring line is cut and the floating fish reef body tries to float, the external pressure decreases, and the difference between the pressure inside the floating body and the outside breaks the blockage, allowing seawater to enter the floating body, causing it to float. A known method is to sink the fish reef itself into the ocean floor.

However, this method is an emergency measure in case the mooring line breaks, and does not prevent the mooring line from breaking.Also, as mentioned above, it requires a large buoyancy force on the floating body, which increases the size of the mooring line and anchor. There was a problem.

[Purpose and structure of the invention]

The present invention reduces the excess buoyancy exerted on floating fish reefs.

Even if the weight of the floating fish reef gradually increases due to the attachment of sea creatures during its installation period, the buoyancy adjustment means increases the buoyancy to keep the reef body afloat at a predetermined water depth with low buoyancy, with a tensile force acting on the mooring cables. The purpose of this system is to provide a mid-level pelagic reef that reduces the risk of breakage by reducing the risk of breakage, and allows the use of small-scale mooring lines and anchors.

For mid-level pelagic fish reefs that are moored to anchors on the seabed and suspended mid-sea, if the floating fish reef sinks below a set water depth, a pressure tank filled with high-pressure gas is operated by a valve switch that operates according to the fluctuating water pressure. A mid-layer floating fish reef position holding mechanism characterized in that the floating position of the floating fish reef is stabilized by repeating the process of supplying gas according to the amount to a buoyancy adjustment tank to increase buoyancy and restore the floating fish reef to a set water depth position. It is in.

〔Example] 1 to 4 show an embodiment of the present invention.

FIGS. 1 and 2 are schematic diagrams showing the intermediate floating fish reef according to the present invention installed in the sea. The floating fish reef main body l has a pressure tank 2 in the center and a buoyancy adjustment tank 3 around it with a frame 4. Enclosed interior; 2. Attachment: It is supported by the frame member, and is moored at four points to anchors 7 on the seabed by four mooring ropes 6 via swivels provided at the lower end of the frame 4. The main body l is floatingly moored at a predetermined depth h above the sea surface.

On the sea surface above the floating fish reef body 1, a buoy 8 indicating the establishment of the floating fish reef is attached to the frame 4 of the floating fish reef body 1 by a holding lobe 9.
is connected to the top of the

A valve switch 5, which will be described in detail later, is connected to the upper part of the pressure tank 2 via a pipe.

Further, each buoyancy adjustment tank 3 is connected to an annular pipe 10 via a pipe, and the annular pipe 10 is configured to communicate with a valve switch 5.

In addition, it is preferable that the frame of the floating fish reef main body 1 has a shape that is not susceptible to resistance from tidal currents as much as possible.

As shown in detail in FIGS. 3(a) and 3(b), the buoyancy adjustment tank 3 is closed at its upper end by a lid 12 connected to a pipe 11 communicating with the annular pipe 10, and at its lower end is a hole 13 through which seawater enters and exits. has been established.

Inside the jacket 14 of the buoyancy adjustment tank 3, a shield 15 that shields the upper gas and the lower seawater is slidably housed. The shield 15 is hollow inside and has a structure that slides due to pressure changes, and its outer periphery is wrapped with an O-ring or the like.

As shown in detail in FIG. 4, the valve opening/closing device 5 is provided with a spring 18 on the upper part of the piston 17 in the cylinder 16. This is so that it can be adjusted.

The piston 17 is connected to a valve 21 via a piston rod 20 passing through the lower part of the cylinder 16. An opening 22 is provided at the bottom of the cylinder 16 through which external seawater enters and exits.

The pressing force of the spring 18 is determined by the pressure of the piston 1 at a predetermined water depth.
Adjust screw 19 to balance the water pressure pushing up 7.
Adjust it with.

This valve switch 5 is fixed by a mounting member 24 so that the valve 21 is located in the middle of a pipe 23 (one end of which communicates with the annular pipe 10) connected to the upper part of the pressure tank 2.

Since the valve opening/closing device 5 has the above-described structure, the spring force is stronger than the pressing force of the piston 17 at a position that is approximately the same as the predetermined water depth position or shallower than the normal state, so that the piston 1
7 is pushed downward, the valve 21 in the pipe 23 is closed, and the gas in the pressure tank 2 is prevented from flowing into the buoyancy adjustment tank 3.

Next, the operation of the present invention will be explained.

When sea life attaches to the floating fish reef body 1 and it becomes heavy, and it is no longer able to float with the originally set buoyancy, the floating fish reef body 1 tends to sink below the predetermined water depth.

At this time, when the water sinks below a predetermined depth, the seawater pressure entering through the opening 22 of the valve switch 5 increases, and the piston 1 in the cylinder 16 increases.
7 becomes stronger than the spring force holding down the piston 17 and pushes the piston 17 upward, thereby opening the valve 21. As a result, high-pressure gas higher than the water pressure at a predetermined water depth sealed in the pressure tank 2 is sent to each buoyancy adjustment tank 3 via the vibrator 23 and the annular vibrator IO.

A plurality of buoyancy adjustment tanks 3 (four in the embodiment) are provided around the pressure tank 2 to stabilize the floating posture of the floating fish reef body 1, and the high-pressure gas sent from the pressure tank 2 is distributed evenly to each tank. It is fed to the upper part of the mantle 14 of the buoyancy adjustment tank 3, and the shield 15 inside the mantle 14 is pushed down to the state shown in FIG. 3 (b) and held balanced at a predetermined position.

When the floating fish reef main body 1 rises to a predetermined water depth, the valve switch 5 is closed, and the buoyancy adjustment is automatically repeated according to the increase in the amount of sea life attached to the floating fish reef, causing it to float at a predetermined water depth. be able to.

In this embodiment, the floating fish reef body 1 is moored with four mooring lines 6, but it may be moored at 1 to 3 points or at 5 or more points, and the buoyancy adjustment tank 3 may also be moored with four mooring lines. However, the object of the present invention can be achieved even if this number is increased or decreased.

In addition, in this embodiment, the valve open/close device 5 has been explained as an example of a piston/cylinder type that uses spring force, but instead of the spring type, a piston/cylinder type that uses liquid/gas pressure or a water depth gauge can be used to determine the predetermined water depth. It may be a mechanism that senses when the sink sinks further and opens and closes the valve based on that signal.

Effects of the Invention 2 According to the present invention, a pressure tank filled with a pressure gas higher than the specified water depth pressure provided in the reef body and a buoyancy adjustment tank are communicated by a pipe through a valve, and this valve has a buoyancy. When the fish reef sinks below a predetermined water depth, the valve is opened and the gas in the pressure tank is sent to the buoyancy adjustment tank to increase buoyancy.This allows the floating fish reef to always float at the predetermined water depth. Even if it is installed for a long period of time and its weight increases due to the attachment of marine life, it can be stably maintained at a specified water depth.

In addition, there is no need to provide a large amount of surplus buoyancy to the floating reef in advance in anticipation of an increase in buoyancy due to the attachment of marine life, and the floating reef can always be kept floating with a low buoyancy commensurate with its weight in the water. These structures have the advantage of being able to be scraped on a small scale because the tensile force applied to them is small.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention. FIG. 2 is a plan view taken along line A-A in FIG. 1, and FIG. 3 (A). (b) is a side sectional view showing an example of a buoyancy adjustment tank used in the present invention, FIG. 4 is a side sectional view showing an example of a valve switch used in the present invention, and FIG. 5 is a known floating fish reef. FIG. l; Floating fish reef body 2: Pressure tank 3: Buoyancy adjustment tank 4: Frame 5: Valve switch 6: Mooring line 7:
Anchor 8: Buoy 9: Holding Robe lO: Circular Vibrator 11: Vibrator 12: Lid 13: Hole 14: Cloak
15: Shielding body 16: Cylinder 17, piston 18
: Spring 19: Adjustment screw 20: Piston rod 21
: Valve 22: Opening 23: Hive 24: Mounting member patent applicant Nippon Steel Corporation

Claims (1)

[Claims] In mid-level floating fish reefs that are moored to anchors on the seabed and suspended in the middle of the sea, when the floating fish reef sinks below the set water depth, a valve switch that operates according to the fluctuating water pressure releases pressure from a pressure tank filled with high-pressure gas. A mid-layer floating fish reef position holding mechanism characterized in that the floating position of the floating fish reef is stabilized by repeating the process of supplying gas according to the amount to a buoyancy adjustment tank to increase buoyancy and restore the floating fish reef to a set water depth position. .