JP2000303423A - Method for preventing attachment of shellfish to wall surface in contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate places of attachment and growing of small shellfishes in a set peripheral area and efficiently prevent attachment of shellfishes on a water contact wall face by densely providing a fibrous hairlike body on the water contact wall face with sea water in a waving state. SOLUTION: Fibrous hairlike bodies (a)..., are densely provided on a water contact wall face with sea water in a waving state. The thickness of the fibrous hairlike body is 0.5-3 mm, the length from the wall face to the waving end is preferably 3-20 cm, and it is preferably provided in density of 1-3 pieces/cm2. Thus, a gap is eliminated for the entrance to the wall face by small shellfishes, which are prevented from attaching to the fibrous hairlike body (a). Thereby attachment of the shellfishes to the wall face is efficiently prevented, the removing work of the shellfishes is hardly required, even such occasion occurs, a removing period can be extended to an extreme.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing shellfish from adhering to a wall surface in contact with seawater.

[0002]

2. Description of the Related Art For example, in a seaside thermal power plant or a nuclear power plant, a form is generally adopted in which seawater is taken in for cooling equipment and cooling wastewater is returned to the sea. In order not to take in shellfish such as barnacles and mussels attached to the water wall, the shells attached to the water-contacting wall around the water intake and the hot drain, and the water-contacting wall near it,
They are periodically removed and incinerated or landfilled.

[0003] In particular, hot effluent discharged from a power plant is regulated to a surrounding seawater temperature of + 7 ° C or less, and such hot effluent provides a comfortable environment for shellfish to live. Since these shells are likely to collect near the drain and lead to the occurrence of troubles in the equipment, the operation is periodically stopped, and the shells are removed and treated with great expense and labor.

[0004]

The amount of shellfish generated reaches 100,000 tons in Japan, and the treatment costs are increasing year by year due to the tightening of waste disposal regulations. It is the present condition that hurt his head.

[0005] In the present invention, shellfishes are conventionally treated on a regular basis on the assumption that they cannot be attached to the water-contacting wall surface. However, the present invention has been made by paying attention to the fact that this causes the above-mentioned inconvenience. It is an object of the present invention to eliminate or significantly reduce the removal of shellfish and waste treatment by preventing the attachment of shellfish itself, which is the root cause of the above-mentioned inconvenience, as much as possible.

[0006] To achieve the above object, the present invention provides:
As a method of preventing shellfish from adhering to the wall surface in contact with seawater,
A fibrous ciliary body is densely disposed on a wall surface in contact with seawater in a freely movable state (Claim 1). Specifically, the fibrous ciliary body has a thickness of 0.5. ３3 mm, the length from the wall surface to the free end is 3-20 cm, for example, 1-3 pcs / cm
^It is disposed on the wetted wall surface at a density of ² (claim 2).

That is, the fibrous ciliary body is densely arranged on the wall surface so that the juvenile shellfish does not have a gap for entering the wall surface,
In addition to this, the filiform ciliary body is made movable so that it is difficult for the fry to adhere to the fibrous ciliary body. I decided to eliminate the nursery.

[0008] This effectively prevents the shellfish from adhering to the water-contacting wall surface, so that the operation of removing the shellfish becomes almost unnecessary, or even if the shellfish adheres to the wall surface or the fibrous ciliary body. Because they are negligible, the need to remove the shellfish can greatly extend the period of regular removal.

[0009] Therefore, according to the present invention, the cost of shellfish removal and waste disposal can be significantly reduced, and the period during which periodic operation for shellfish removal is stopped, for example, at a power plant, is extremely short. can do.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a wall structure made of concrete, steel, or the like at a seaside, for example, at an intake port or a hot drainage port of a power plant or in a surrounding area thereof.

In constructing the concrete wall 1,
As shown in FIG. 2, a fibrous ciliary body a having a thickness of 0.5 to 3 mm and a length from a wall surface to a free end of 3 to 20 cm is formed on a sheet 2 made of, for example, paper or synthetic resin. 1-3 pieces / cm
Planted in ² density, the sheet 2 concrete form 3
The concrete 4 is poured into the mold 3 by means of bonding or the like, and the mold 3 is released from the mold after the concrete is cured.

By the construction of the wall 1, the fibrous ciliary body a is densely disposed on the wall surface in contact with the seawater in a freely movable state, so that the juvenile shellfish in the seawater is The dense fibrous ciliary body a narrows the gap into the wall surface, making it difficult to adhere to the wall surface.

[0013] In addition, since the fibrous ciliary body a always moves by running water, it is difficult for the young shellfish in seawater to adhere to this fibrous ciliary body a. In the peripheral region of the wall 1 on which the fibrous ciliary body a is disposed, the attachment of juvenile shellfish and the growth area are eliminated, so that the attachment of shellfish to the water-contacting wall surface of the wall 1 is effectively prevented. .

Therefore, the work of removing the shellfish is almost unnecessary, or even if the shellfish adheres to the wall surface or the fibrous ciliary body a, the amount is very small, so that it is necessary to remove the shellfish. Even so, the period of periodic removal can be extremely extended.

The material of the fibrous ciliary body a is a plastic fiber such as polyethylene or polypropylene, a metal fiber such as iron, aluminum or stainless steel, a mineral fiber such as glass or rock wool, or a plant fiber such as hemp or palm. Natural fibers such as properties can be arbitrarily selected, and in the above-described flocking method, the burying length of the fibrous ciliary body a in the concrete 4 is, for example, 5 to 1
0cm, but after the construction of the concrete wall 1,
Modifications such as bonding one end of the fibrous ciliary body a with an adhesive (for example, a seawater-resistant adhesive) are possible.

Alternatively, as shown in FIG. 3, a net-like (or sheet-like) ciliary body holding substrate 5 having a dense mesh is formed of a plastic fiber, a metal fiber, a natural fiber, or the like. The fibrous ciliary body a of the same kind, different kind, or a mixture thereof is densely provided with the ciliary body holding base material 5 in a state where the base material 5 is manufactured and is freely movable on the base material 5. It may be installed on the water-contacting wall using an anchor bolt or the like.

According to the above configuration, even if the water-contacting wall surface has irregularities, the base material 5 can be stretched along the wall surface and shells adhere to the fibrous ciliary body a. Even if it does, or even if the base material 5 is damaged, by replacing it, the adhesion prevention function of shellfish can be easily restored.

[0018]

As described above, according to the present invention, a fibrous ciliary body is densely arranged on a water-contacting wall surface so as not to give a gap for a juvenile shellfish in seawater to enter the wall surface. The fibrous ciliary body is made movable so that the mussel does not adhere to the fibrous ciliary body. According to the method of the present invention, the peripheral region of the wall where the fibrous ciliary body is installed is provided. In addition, since the attachment of juvenile shellfish and the nursery are eliminated, the attachment of shellfish to the water-contacting wall surface is effectively prevented.

Therefore, the shellfish removal work becomes almost unnecessary, or even if the shellfish adheres to the wall surface or the fibrous ciliary body, the amount is very small and it is necessary to remove the shellfish. However, according to the present invention, the cost of shellfish removal and waste disposal can be significantly reduced because the periodical removal period can be extremely extended. The period of suspension of typical operation can be extremely shortened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a seaside concrete wall in which fibrous ciliary bodies are densely arranged.

FIG. 2 is a partial cross-sectional view showing a construction example of a concrete wall body having a ciliary body.

FIG. 3 is a sectional view showing another embodiment of the ciliary body arrangement.

[Explanation of symbols]

 a: fibrous ciliary body.

Claims (2)

[Claims] The present invention relates to a shellfish, wherein a fibrous ciliary body is densely arranged in a freely movable state on a wall surface in contact with seawater to prevent shellfish from adhering to the wall surface in contact with seawater. Adhesion prevention method. 2. A fibrous ciliary body having a thickness of 0.5 to 3 mm and a length of 3 to 20 cm from the wall surface to the free end is disposed on the water-contacting wall surface at a density of 1 to 3 fibers / cm ^2. The method for preventing adhesion of shellfish according to claim 1 provided.