JP2533729B2 - Sea life prevention net - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a net for preventing marine organisms such as jellyfish from entering a cooling water intake port provided on a quay or the like.

[0002]

BACKGROUND OF THE INVENTION Marine structures that are in contact with seawater are constantly exposed to fouling by the attachment of marine organisms. For example, at intakes that take in seawater from thermal power plants and nuclear power plants, adjust the net by tilting the net from the sea to near the bottom of the sea so that it surrounds the intake on the quay to prevent the inflow of jellyfish. ing.

Conventionally, various techniques for preventing marine organisms from adhering have been studied. One of the techniques for preventing marine organisms from being put into practical use at present is to paint a coating containing zinc oxide or organic tin with a high molecular weight polyethylene. What is applied to the surface of the net | network which consists of is known.

[0004]

However, in the case where the coating is applied to the surface of such a net made of polyethylene, the coating is eluted and consumed, so that about one year is required.
There is a problem in that maintenance is complicated because maintenance work such as pulling up the circuit and repainting is required.

According to a long-term experimental study of the present inventors, it has been found that a net made of a beryllium-copper alloy can be used to obtain an extremely excellent effect of preventing marine organisms from adhering to sea and jellyfish. The reason is presumed to be that the beryllium element in the beryllium copper alloy acts synergistically with the copper element, exerting a large repellent effect on marine organisms, and preventing the attachment and reproduction of marine organisms for a long time. .

SUMMARY OF THE INVENTION An object of the present invention is to prevent the invasion of marine life such as whales, purple shellfish and algae, as well as marine life such as jellyfish, and eliminate the need for maintenance and inspection work which is excellent in durability. An object of the present invention is to provide a biofouling prevention net.

[0007]

Means for Solving the Problems The marine organism adhesion preventing net of the present invention for solving the above problems is reticulated by a material made of beryllium copper alloy having a beryllium content of 0.2 to 2.8% by weight. It is characterized in that it is composed of a formed material part and a space part surrounded by this material part and capable of passing seawater.

The beryllium copper alloy is preferably any one selected from the group consisting of Be--Co based copper alloys, Be--Co--Si based copper alloys and Be--Ni based copper alloys. The content ratios of cobalt, nickel, and silicon selectively contained in the beryllium copper are preferably in the following ranges, respectively.

Cobalt (Co): 0.2 to 2.7% by weight Nickel (Ni): 1.4 to 2.2% by weight Silicon (Si): 0.2 to 0.35% by weight Addition of each element described above The purpose and the reason for limiting the upper limit and the lower limit of the addition range are as follows.

Beryllium (Be): 0.2 to 2.8 wt% Be is added so that when the antifouling structure is immersed in seawater, Be is eluted to exert an antifouling effect and beryllium copper. This is because the properties of the alloy such as strength and corrosion resistance are improved, the manufacturability such as heat treatment property and grain size adjustment is improved, and the formability and castability are improved. Be is 0.
If the amount is less than 2% by weight, the above effects (1) to (3) are not sufficiently exhibited. If Be exceeds 2.8% by weight, the stretchability decreases and the cost becomes high.

Cobalt (Co): 0.2-2.7% by weight Co is added because it forms a fine CoBe compound and disperses it in the alloy to control mechanical properties, heat treatment properties, crystal grain size, etc. This is for improving the manufacturability. Co is 0.2
If the amount is less than the weight%, the above effect is not sufficiently exhibited.
If the Co content exceeds 2.7% by weight, the flowability of the molten metal decreases, and the above-mentioned properties hardly improve, and the cost becomes high.

Nickel (Ni): 1.4 to 2.2% by weight Ni is added because a fine NiBe compound is formed and dispersed in an alloy to provide mechanical properties, heat treatment properties, crystal grain size adjustment, and the like. This is for improving the manufacturability. Ni is 1.4
If the amount is less than the weight%, the above effect is not sufficiently exhibited.
If the content of Ni exceeds 2.2% by weight, the flowability of the molten metal decreases, and the above characteristics hardly improve, and the cost becomes high economically.

Silicon (Si): 0.2 to 0.35 wt% Si is added to improve the flowability of the beryllium alloy. If the content of Si is less than 0.2% by weight, the effect is not sufficiently exhibited, and if the content of Si exceeds 0.35% by weight, the alloy becomes brittle and the toughness is reduced. The composition of the beryllium copper alloy used for the antifouling structure is
For example, Be: 0.2 to 1.0% by weight, Co: 2.4
~ 2.7 wt%, balance Cu and unavoidable impurities, B
e: 0.2 to 1.0 wt%, Ni: 1.4 to 2.2 wt%, balance Cu and unavoidable impurities, Be: 1.0 to
2.0% by weight, Co: 0.2 to 0.6% by weight, balance Cu
And unavoidable impurities, Be: 1.6 to 2.8% by weight,
Co: 0.4 to 1.0% by weight, Si: 0.2 to 0.35
% By weight, balance Cu and inevitable impurities.

[0014]

According to the marine organism adhesion preventing net having the above construction of the present invention, seawater can be freely circulated from the space portion, and copper ions are eluted from the material portion made of the copper alloy, so that the material portion to the material portion can be removed. The marine organisms are prevented from adhering, and the net-shaped material portion prevents marine organisms such as jellyfish from entering the other side from one side of the net.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. First, the method of stretching the net will be described. A net will be stretched from the sea to the vicinity of the seabed in a downward direction so as to surround the cooling water intake of a thermal power plant or a nuclear power plant. This will be described with reference to FIGS. As shown in FIGS. 1 and 2, a net 5 is stretched between the main body buoy 2 provided on the pier 1 and the fixed block 4 provided on the seabed 3 so as to be inclined. The net 5 is stretched on the front side of the intake 8 of the quay 7. The tension angle of the net 5 is set to, for example, an angle of about 45 ° on average. This is because if the tension angle of the net 5 is made too small, the net 5 will be displaced downward when a large amount of jellyfish tries to flow in, and as a result, the under-net opening between the net 5 and the seabed 3 will be almost closed. This is because the inflow of seawater into the water intake port 8 is hindered. Conversely, if the tension angle is too large, the effective surface area of the net decreases, and even if a small amount of jelly flows, the net tends to be closed by the jelly.

Next, various embodiments of the net 5 are shown in FIGS. A first embodiment of the present invention is shown in FIG. The first embodiment is generally of a fence type, and is made by bending a wire material of a copper alloy, for example, beryllium copper alloy into a jagged shape, and intertwining these into a mesh shape. In this normal fence type net 10, a rectangular unit having a certain size is used as one unit 6, and the unit 6 is assembled in the left-right direction as shown in FIG.
A mesh belt extending 0 m is constructed. Net 10 is the material part 10
It consists of a and a space 9.

A second embodiment of the present invention is shown in FIG. In the second embodiment shown in FIG. 4, wire rods made of a beryllium copper alloy are superposed in a lattice shape with vertical lines 11 and horizontal lines 12, and the superposed portions are welded. A third embodiment of the present invention is shown in FIGS. The third embodiment shown in FIGS. 5 and 6 is an example in which the pipes 14 made of beryllium copper alloy are arranged in parallel in the lateral direction, and the thin wires 15 made of beryllium copper alloy are stretched so as to intersect the pipes 14. . In this example, the thin wire 15 made of beryllium copper alloy is made of several twisted wires, and the pipe 14 is inserted between the twisted wires 15a and 15b to fix the pipe 14 and the thin wire 15.
The pipe 14 is formed by bending a thin plate made of beryllium copper alloy into a tubular shape. This is because the manufacturing cost is extremely reduced by bending a thin plate material of beryllium copper alloy into a pipe shape. Also, the weight is significantly reduced. The size of the openings formed by the pipe 14 and the thin wires 15 in a grid pattern is 40 to 40 in consideration of preventing intrusion of jellyfish.
Set to about 60 mm.

A fourth embodiment of the present invention is shown in FIG. In the fourth embodiment shown in FIG. 7, a rectangular frame body 18 made of beryllium copper alloy is formed, and a vertical direction made of beryllium copper alloy is formed as if a gut of a tennis racket is stretched inside the frame body 18. This is an example in which a wire rod 19 and a horizontal wire rod 20 are tensioned and stretched. Each wire rod 1
9 and 20 are fixed at the frame 18. Wire 1
9 and 20 have a diameter of, for example, about 0.3 mm and are stretched in a lattice shape. According to this example, there is an effect that the weaving work is unnecessary and the weight is reduced.

As a modified example of the fourth embodiment, the fine wires 19, 20 formed of the beryllium copper alloy formed in the fourth embodiment.
Instead of this, it is also possible to use a twisted wire or wire made of a mixed weave of resin fibers such as nylon fibers, polyethylene fibers and beryllium copper alloy. In the case of this mixed weaving, it is also possible to put it on a machine for knitting a normal diamond-shaped net, and it is possible to significantly reduce the manufacturing cost.

Since the fine wires 19 and 20 are knitted in a lattice shape by applying tension, the fine wires 1 are subjected to a load twisted in a water stream.
Abrasion between 9 and 20 can be reduced. The reason for using the resin fiber is to prevent electrolytic corrosion with the beryllium copper alloy. A fifth embodiment of the present invention is shown in FIGS. 8, 9 and 10. The fifth embodiment shown in FIGS. 8, 9 and 10 is a blind type in which a plate member 22 made of beryllium-copper alloy is used for the horizontal member and thick wires 24 and thin wires 26 are used for the vertical members.

The size of the openings of the lattice is 40 mm. A thin wire 26 is inserted through a hole formed in the plate member 22, and thick lines 24 on both sides are fastened at the intersection with the plate member 22. By pulling the thick line 24 to the upper part, it is possible to easily collect the net from seawater to the ground. Since the plate member 22 is a thin plate-shaped beryllium copper alloy, the material cost can be reduced. In addition, in this embodiment, when performing maintenance and inspection, there is an effect that repairing and inspection work can be facilitated by collecting on the ground, and cleaning can be easily performed.

A sixth embodiment of the present invention is shown in FIGS. 11, 12 and 13. In the sixth embodiment shown in FIGS. 11, 12 and 13, a beryllium copper alloy wire rod is used to weave a strip material 28 having a ring-shaped cross section as shown in FIG. This is an example of forming a lattice or a diamond-shaped net with an opening of 40 mm by. The strip 28 is formed in a net shape by intersecting the vertical direction and the horizontal direction. Since the inside of the strip 28 is formed in a hollow shape, the contact surface area with the seawater is increased and the weight can be reduced. Vertical strip 28
The strips a and the lateral strips 28b are formed in a lattice shape, and are fastened by welding or the like at intersections.

As a modification of the sixth embodiment, a thin plate-shaped band may be formed of beryllium copper alloy as shown in FIG. 13, and the thin plate-shaped beryllium copper alloy 29 may form a mesh in a lattice pattern. . A seventh embodiment of the present invention is shown in FIGS. 14, 15 and 16. 14, 15, and 16
In the seventh embodiment shown in (1), a panel-like material made of beryllium copper alloy is punched out to form a net-like shape. The mesh body 30 includes a mesh portion 31 and a frame portion 32 forming a frame. As shown in FIG. 17, the corner portion 33 is made thick. This is because by making the frame thick, the frame 32 exerts an effect of reinforcing it even if it receives its own weight.

In the seventh embodiment, since the corner portion 33 is reinforced, there is an effect that the shape retaining property at the time of pulling up the net body 30 is maintained. An eighth embodiment of the present invention is shown in FIGS. In the eighth embodiment shown in FIGS. 18 and 19, a reinforcing bar 38 is provided on a diagonal line of a rectangular frame body 36 made of beryllium copper alloy, and the frame body 36 is provided.
20 is an example in which an armor wire net 39 shown in FIG. 20 is stretched in a space surrounded by the reinforcing bar 38. Since the adjacent twisted portions 39a are engaged with each other at the twisted portion 39a of the upper wire net 39, the wear given to this portion is reduced.

FIG. 20 and FIG. 21 show the ninth embodiment of the present invention.
Shown in In the ninth embodiment shown in FIGS. 20 and 21, a thick rectangular wire 41 made of beryllium-copper alloy forms a rectangular flat space, and thin wires 42 made of beryllium-copper alloy are stretched in a grid pattern in the flat space. There is. Both ends of the thin wire 42 are fastened to the thick wire 41 by hooks 43. The size of the grid formed by the thin wires 42 is about 40 mm.

The thin wire 42 is formed in a ring shape by fitting ring-shaped ring members 44 in a ring as shown in FIG. As described above, according to the marine organism adhesion prevention net according to the above-described embodiment, by using a material made of beryllium copper alloy, beryllium ions act synergistically with copper ions to greatly repel sea creatures. It is possible to prevent the adhesion and reproduction of marine life for a long time. Further, since the material portion made of the beryllium copper alloy is formed in a net shape, intrusion of relatively large jellyfish or the like is prevented. Furthermore, the net made of a beryllium copper alloy has a remarkable effect that the maintenance and inspection work can be made unnecessary since the adhesion of marine organisms can be prevented, the durability is good, and maintenance is not required.

In the above-mentioned embodiment, an example in which beryllium copper alloy is used as a net material has been described, but in the present invention,
A copper alloy mesh is good.

[0028]

As described above, according to the marine organism adhesion preventing net of the present invention, copper ions are eluted into seawater by using a material made of a copper alloy and exert a great repellent effect on marine organisms. However, it is possible to prevent the attachment and reproduction of marine organisms for a long time. Furthermore, since it is formed in a net shape with a material portion made of a copper alloy, intrusion of relatively large jellyfish or the like is prevented.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an attachment structure of a net attached to an intake port to which the present invention is applied.

FIG. 2 is a view taken in the direction of arrow II shown in FIG.

FIG. 3 is a schematic diagram showing a first embodiment of the present invention.

FIG. 4 is a schematic view showing a modified example of the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing a second embodiment of the present invention.

FIG. 6 is an enlarged sectional view taken along line VI shown in FIG.

FIG. 7 is a schematic diagram showing a fourth embodiment of the present invention.

8 is a view taken in the direction of the arrow IX shown in FIG.

9 is a sectional view taken along line XX shown in FIG.

FIG. 10 is a schematic view showing a fifth embodiment of the present invention.

FIG. 11 is a schematic configuration diagram showing a sixth embodiment of the present invention.

12 is an enlarged sectional view taken along line XII shown in FIG.

FIG. 13 is a sectional view showing a modification of the sixth embodiment of the present invention, which corresponds to FIG.

FIG. 14 is a schematic configuration diagram showing a seventh embodiment of the present invention.

FIG. 15 is an enlarged view of XV shown in FIG.

16 is a sectional view taken along line XVI shown in FIG.

FIG. 17 is a schematic cross-sectional view showing a frame body portion according to a seventh embodiment of the present invention.

FIG. 18 is a schematic configuration diagram showing an eighth embodiment of the present invention.

19 is an enlarged view of a portion XX shown in FIG.

FIG. 20 is a schematic configuration diagram showing a ninth embodiment of the present invention.

21 is an enlarged view of a portion XXI shown in FIG.

[Explanation of symbols]

 5 Net 9 Space 10 Net (material part) 11, 12 Fine wire (material part)

Claims (1)

(57) [Claims] 1. A beryllium content of 0.2 to 2.8
A marine organism adhesion-preventing net comprising: a raw material portion formed of a material made of a beryllium copper alloy in an amount of% by weight, and a space portion surrounded by the raw material portion and capable of passing seawater.