JPH06261663A - Apparatus for preventing adhesion of marine organism - Google Patents

Abstract

PURPOSE:To provide an apparatus effective for surely preventing the adhesion of marine organisms such as barnacle, blue mussel and algae, having excellent durability to dispense with the maintenance and inspection works and easily applicable to the objective part. CONSTITUTION:A plate 11 is formed by bending both sides of a thin sheet made of a beryllium-copper alloy. The bent part 11a of the sheet 11 is pressed with a band plate 21 and fixed to a pit wall surface 50 with an anchor bolt 22. The rigidity of the plate 11 is increased by the presence of the bent part 11a to enable the reduction of the thickness of the plate 11 to an extent corresponding to the rigidity increase. Accordingly, the strength and the thickness of the band plate 21 can be decreased. The number of anchor bolts 22 is also decreased to facilitate the application on site. Since the plate 11 and the band plate 21 have thin thickness and the elasticity of the bent part 11a is high, the plate 11 can easily be attached along the pit wall surface 50 with the band plate 21 even if there is some unevenness on the pit wall surface 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine organism adhesion preventing device for preventing marine organisms such as shellfish from adhering to the pit wall surface of a cooling water intake provided on a quay or the like.

[0002]

2. Description of the Related Art Marine structures in contact with seawater are constantly exposed to fouling due to the adhesion of marine life. For example, in a pit of an intake port for taking in seawater of a thermal power plant or a nuclear power plant, a marine organism adhesion preventing paint is applied to the pit wall surface to prevent marine organisms such as shellfish from adhering thereto.

Conventionally, various techniques for preventing adhesion of marine organisms have been researched. Among them, one of the techniques for preventing adhesion of marine organisms that is currently in practical use is a coating containing zinc copper oxide or organic tin on the pit surface. What to apply is known.

[0004]

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

According to a long-term experimental study conducted by the present inventor, it was found that a sheet made of a beryllium copper alloy was used and a very excellent effect of preventing adhesion of marine organisms was obtained by using this sheet. The reason for this is presumed to be that beryllium ions act synergistically with copper ions to exert a large repellent effect on marine organisms, and to prevent adhesion and reproduction of marine organisms for a long period of time.

An object of the present invention is to prevent marine organisms such as barley, purple shellfish and algae from adhering surely, to eliminate the need for maintenance and inspection work having excellent durability, and to prevent marine organisms from adhering easily. To provide.

[0007]

A marine organism adhesion preventing device of the present invention for solving the above-mentioned problems comprises a sheet-shaped thin plate portion made of a copper alloy, and both ends of the thin plate portion are bent and bent. It is characterized by comprising a plate body having a bent portion and a fixing means for fixing the plate body to a wall surface.

The copper alloy is preferably a beryllium copper alloy. When a beryllium copper alloy is used, the beryllium content is 0.2 to 2.8% by weight and is selected from the group consisting of Be-Co-based copper alloys, Be-Co-Si-based copper alloys and Be-Ni-based copper alloys. It is desirable that the alloy be any one selected. The content ratios of beryllium, cobalt, nickel and silicon selectively contained in the copper alloy are preferably in the following ranges, respectively.

Beryllium (Be): 0.2 to 2.8 wt% Cobalt (Co): 0.2 to 2.7 wt% Nickel (Ni): 1.4 to 2.2 wt% Silicon (Si): 0.2 to 0.35% by weight The purpose of adding each element and the reasons for limiting the upper and lower limits of the addition range are as follows.

Beryllium (Be): 0.2 to 2.8 wt% Be is added when the plate is immersed in seawater.
Elute Be to exert antifouling effect, improve properties such as strength and corrosion resistance of copper alloy, improve manufacturability such as heat treatment property and grain size adjustment, and improve moldability and castability. This is because If Be is less than 0.2% by weight, the above effects (1) to (7) are not sufficiently exhibited. Be is 2.
If it exceeds 8% by weight, the wrought workability deteriorates and it becomes economically expensive.

Cobalt (Co): 0.2 to 2.7 wt% Co is added to form fine CoBe compounds and disperse them in the alloy to obtain mechanical properties, heat treatment properties, grain size adjustment, etc. This is for improving the manufacturability of. Co is 0.2
If it is less than wt%, the above-mentioned effects cannot be sufficiently exhibited.
This is because when Co exceeds 2.7% by weight, the flowability of the molten metal deteriorates, the above properties are hardly improved, and the cost becomes economically expensive.

Nickel (Ni): 1.4 to 2.2 wt% Ni is added to form fine NiBe compounds and disperse them in the alloy to obtain mechanical properties, heat treatment properties, grain size adjustment, etc. This is for improving the manufacturability of. Ni is 1.4
If it is less than wt%, the above-mentioned effects cannot be sufficiently exhibited.
This is because when Ni exceeds 2.2% by weight, the flowability of the molten metal deteriorates, the above properties are hardly improved, and the cost becomes economically expensive.

Silicon (Si): 0.2 to 0.35 wt% Si is added to improve the flowability of the beryllium alloy. If Si is less than 0.2% by weight, the effect is not sufficiently exhibited, and if Si is more than 0.35% by weight, the alloy becomes brittle and the toughness deteriorates. The composition of the copper alloy used for the plate is, for example, Be: 0.2 to 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 wt%, balance Cu and unavoidable impurities, Be: 1.0 to 2.0 wt%, Co: 0.2 to
0.6% by weight, balance Cu and inevitable impurities, Be:
1.6-2.8% by weight, Co: 0.4-1.0% by weight,
Si: 0.2 to 0.35% by weight, balance Cu and inevitable impurities.

[0014]

According to the apparatus for preventing adhesion of marine organisms of the present invention, the plate body made of the copper alloy is repelled by marine organisms, and the plate body has a bent portion to increase the rigidity of the plate body.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention is shown in FIGS. In the first embodiment, a sheet made of beryllium copper alloy, for example, as a thin plate, as a copper alloy having a width of about 430 mm and a plate thickness of about 0.5 mm in consideration of convenience of manufacturing, transporting, handling, etc. of the plate body 11. Is an example using. The plate 11 is formed by bending both ends of this sheet. In this case, plate 1
The length of 1 in the longitudinal direction is variable. As a result of bending, the lateral width a of the plate 11 becomes about 400 mm. The bent portion 11a of the plate body 11 is pressed by the strip plate 21, and the plate body 11 is fixed to the pit wall surface 50 by the anchor bolt 22. Anchor bolt 2
The mounting pitch b of 2 is about 600 mm.

A first comparative example is shown in FIGS. 4 and 5 in order to clarify the function and effect of the first embodiment. The sheet 10 used in the first comparative example is the same as the sheet used in the first example except that the sheet thickness is 0.5 to 1 mm, and the sheet 10 is used in a thin plate shape without bending both ends. Attachment holes for anchor bolts 22 are provided at both ends orthogonal to the longitudinal direction of the seat 10, and the seats 10 are fixed to the pit wall surface 50 by the anchor bolts 22. The attachment pitch c of the anchor bolt 22 is about 300 mm.

In the first embodiment, the plate 11 is provided with a bent portion 11a.
By virtue of this, the rigidity is higher than that of the sheet 10 of the first comparative example, the thickness of the plate body 11 can be reduced, and the weight per unit area is reduced. Therefore, the strength of the strip plate 21 that presses the plate body 11 can be low, and the thickness of the strip plate 21 can be reduced. Further, the attachment pitch b of the anchor bolt 22 can be made longer than the attachment pitch c of the first comparative example. The plate 11 and the strip 21 can be made thin, and the elasticity of the sheet originally made of beryllium-copper alloy is further promoted by the bent portion 11a.
Even if there is some unevenness, the plate body 11 can be reliably and easily attached along the pit wall surface 50 with the strip plate 21. If the rigidity of the strip plate 21 is increased, the attachment pitch of the anchor bolts 22 is further increased, and the number of attachments is reduced, which facilitates on-site construction. Further, since the plate body 11 is pressed by the strip plate 21, the number of steps for providing the plate body 11 with the attachment holes for the anchor bolts 22 is omitted. Since the bent portion 11a is formed by a press machine, it can be processed in a short time. Further, since the bent portion 11a and the strip plate 21 are highly airtight, it is possible to prevent marine life from entering through the gap and adhering to the pit wall surface 50.

A second embodiment of the present invention is shown in FIG. In the second embodiment, the upper surface and the lower surface of the plate body 11 of the first embodiment are reversed, and the plate body 11 is fixed to the pit wall surface 50 so that the bent portion 11a of the plate body 11 contacts the pit wall surface 50. To 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 more stably fixed to the pit wall surface 50 than in the embodiment.

In each of the above-mentioned embodiments, the example in which the organism adhesion preventing device is applied to the pit wall surface has been described. However, as long as the wall surface is desired to prevent marine organisms from adhering, the marine organisms of the present invention can be applied to any place. It is possible to apply an anti-adhesion device.

[0020]

As described above, according to the method for preventing adhesion of marine organisms of the present invention, by using a sheet-shaped material made of a copper alloy, copper ions and the like are continuously eluted, and marine organisms are continuously eluted. It is possible to prevent the adherence and reproduction of the fish for a long period of time. Further, since the plate body made of copper alloy has good durability and does not require maintenance, there is a remarkable effect that maintenance and inspection work can be omitted. Further, 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 made thin and the weight can be reduced, and the number of fixing means can be reduced to facilitate the construction on site. is there.

[Brief description of drawings]

FIG. 1 is a schematic vertical 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 a marine organism adhesion preventing device according to the first embodiment of the present invention.

FIG. 3 is a schematic vertical 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.

5 is a cross-sectional view taken along line VV shown in FIG.

[Explanation of symbols]

 11 plate body 11a bent portion 21 strip plate (fixing means) 22 anchor bolt (fixing means)

Claims (1)

[Claims] 1. A plate body made of a copper alloy and formed in a sheet shape, and a plate body having a bent portion in which both ends of the thin plate portion are bent, and a fixing means for fixing the plate body to a wall surface. An apparatus for preventing adhesion of marine organisms, comprising: