JP2595180B2 - Sea life adhesion prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing marine organisms such as shells from attaching to the pit wall of 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, in a pit at an intake port for taking in seawater from a thermal power station or a nuclear power station, a marine organism adhesion preventing paint is applied to the pit wall surface to prevent marine organisms such as shells from attaching.

Conventionally, various techniques for preventing marine organisms from adhering to the sea have been studied. One of the techniques for preventing marine organisms from adhering to the surface of the pit is to apply paint containing zinc copper oxide or organic tin to the pit surface. What is applied is known.

[0004]

However, in such a method of applying paint to the pit wall, the paint is eluted and consumed, so that the pit is drained about once a year to clean the wall. There is a problem that maintenance and repair work such as base treatment and coating is required, and maintenance is complicated.

According to a long-term experimental study of the present inventors, it has been found that a sheet made of a beryllium copper alloy is used and an extremely excellent effect of preventing marine organisms from being adhered can be obtained. The reason is presumed to be that beryllium ions act synergistically with copper ions to exert a large repellent effect on marine organisms, and also to prevent the attachment and reproduction of marine organisms for a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for preventing sea organisms such as wisteria, purple shellfish, and algae from sticking to each other, eliminating the need for maintenance work with excellent durability, and facilitating construction. Is to provide.

[0007]

According to the present invention, there is provided an apparatus for preventing marine organisms from adhering to a vehicle, comprising a sheet-shaped thin plate made of a copper alloy, and both ends of which are bent. It is characterized by comprising a plate having a bent portion and fixing means for fixing the plate to a wall surface.

The copper alloy is preferably a beryllium copper alloy. In the case of using a beryllium copper alloy, the content of beryllium is 0.2 to 2.8% by weight and is selected from the group consisting of Be-Co-based copper alloy, Be-Co-Si-based copper alloy, and Be-Ni-based copper alloy. Desirably, one of the selected alloys is used. The contents of beryllium, cobalt, nickel, and silicon selectively contained in the copper alloy are preferably in the following ranges.

Beryllium (Be): 0.2 to 2.8% by weight 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 The purpose of addition of each element and the reasons for limiting the upper and lower limits of the addition range are as follows.

[0010] Beryllium (Be): 0.2 to 2.8 wt% Be is added when the plate is immersed in seawater.
Elutes Be to exhibit antifouling effects, improves the properties of copper alloys such as strength and corrosion resistance, improves heat treatability, increases manufacturability such as grain size adjustment, and improves moldability and castability. To do that. If Be is less than 0.2% by weight, the above effects (1) to (3) are not sufficiently exhibited. Be is 2.
If it exceeds 8% by weight, the stretchability is reduced and the cost is 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% The addition of 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 copper alloy used for the plate body is, for example, Be: 0.2-1.
0% by weight, Co: 2.4 to 2.7% by weight, balance Cu and unavoidable impurities, Be: 0.2 to 1.0% by weight, N
i: 1.4 to 2.2% by weight, 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, with the balance being Cu and unavoidable impurities.

[0014]

According to the apparatus for preventing the adhesion of sea creatures having the above construction of the present invention, sea creatures repel the plate made of the copper alloy, and the rigidity of the plate is increased by the bent portion of the plate.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. In the first embodiment, a sheet formed of a thin plate of, for example, a beryllium copper alloy as a copper alloy having a width of about 430 mm and a thickness of about 0.5 mm in consideration of the convenience of manufacturing, transporting, and handling the plate body 11. This is an example using. By bending both ends of the sheet, the plate 11 is formed. In this case, the plate 1
The length in the longitudinal direction of one is variable. As a result of bending, the width a of the plate body 11 becomes about 400 mm. The bent portion 11 a of the plate 11 is pressed by the band plate 21, and the plate 11 is fixed to the pit wall surface 50 by the anchor bolt 22. Anchor bolt 2
The mounting pitch b of No. 2 is about 600 mm.

In order to clarify the operation and effect of the first embodiment, a first comparative example is shown in FIG. 4 and FIG. The sheet 10 used in the first comparative example is the same as the sheet used in the first example except that the thickness of the sheet 10 is 0.5 to 1 mm. Attachment holes for anchor bolts 22 are provided at both ends of the sheet 10 perpendicular to the longitudinal direction, and the seat 10 is fixed to the pit wall 50 by the anchor bolts 22. The mounting pitch c of the anchor bolt 22 is about 300 mm.

In the first embodiment, a bent portion 11a
Due to this, the rigidity is higher than that of the sheet 10 of the first comparative example, the thickness of the dividing plate 11 can be reduced, and the weight per unit area is reduced. For this reason, the strength of the strip 21 for holding the plate 11 can be low, and the thickness of the strip 21 can be reduced. Further, the mounting pitch b of the anchor bolt 22 can be made longer than the mounting pitch c of the first comparative example. The plate 11 and the strip 21 can be made thinner, and the elasticity of the sheet originally formed of the beryllium copper alloy is promoted by the bent portion 11a.
The plate 11 can be securely and easily attached along the pit wall 50 by the band plate 21 even if there are some irregularities. If the rigidity of the band plate 21 is increased, the mounting pitch of the anchor bolts 22 is further increased, and the number of mounting the anchor bolts 22 is reduced. Further, since the plate body 11 is pressed by the band plate 21, the man-hour for providing the mounting hole for the anchor bolt 22 in the plate body 11 is omitted. Since the formation of the bent portion 11a is performed by a press machine, it can be processed in a short time. In addition, since the airtightness between the bent portion 11a and the band plate 21 is high, it is possible to prevent sea creatures from entering the gap and attaching to the pit wall surface 50.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the upper surface and the lower surface of the plate 11 of the first embodiment are inverted, and the plate 11 is fixed to the pit wall 50 so that the bent portion 11a of the plate 11 contacts the pit wall 50. I do. Since the contact area between the plate body 11 and the pit wall surface 50 is relatively small, even if the pit wall surface 50 has irregularities,
It can be fixed to the pit wall 50 more stably than the embodiment.

In each of the embodiments described above, an example is described in which the biofouling prevention device is applied to the wall surface of the pit. It is possible to apply an anti-adhesion device.

[0020]

As described above, according to the method for preventing marine organisms from adhering to seawater according to the present invention, copper ions and the like are continuously eluted by using a sheet-shaped material made of a copper alloy, and marine organisms are prevented from being eluted. Adhesion and propagation can be prevented for a long time. Further, the plate body made of a copper alloy has a remarkable effect that the maintenance and inspection work can be made unnecessary because the durability is good and the maintenance is unnecessary. Furthermore, since the plate body having the bent portions obtained by bending both ends of the thin plate portion has high rigidity, the plate thickness can be reduced, the weight can be reduced, and the number of fixing means can be reduced to facilitate the on-site construction. is there.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a marine organism adhesion preventing device according to a first embodiment of the present invention.

FIG. 2 is a schematic front view showing the marine organism adhesion preventing device according to the first embodiment of the present invention.

FIG. 3 is a schematic longitudinal sectional view showing a marine organism adhesion preventing device according to a second embodiment of the present invention.

FIG. 4 is a schematic front view showing a marine organism adhesion preventing device according to a first comparative example.

FIG. 5 is a sectional view taken along line VV shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Plate 11a Bending part 21 Strip (fixing means) 22 Anchor bolt (fixing means)

Claims (1)

(57) [Claims] 1. A plate body made of a copper alloy and having a thin plate portion formed in a sheet shape, and a bent portion obtained by bending both ends of the thin plate portion, and fixing means for fixing the plate body to a wall surface. An apparatus for preventing marine organisms from adhering, comprising: