JPH05168365A - Structure for improving fish-gathering places - Google Patents

Abstract

PURPOSE:To provide a structure for improving fish-gathering places and the production process therefor which is in no need of mold frame formation and assembling, and can be built up easily and can be conveyed on the boat and sunk into the sea from the boat. CONSTITUTION:A take 1 whose inside to be filled has a shape for gathering fishes is conveyed by a boat 4 loading cement till the sea area of a fish- gathering place. Then the tank is connected to a tube 3 and sunk into the sea bottom and the inside of the tank is filled with cement through the tube 3 to form the place for gathering fishes. The material to be cast is not only cement, but may be mixture thereof with fly ash.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish field improving structure such as an artificial fish reef and a method for producing the structure.

[0002]

2. Description of the Related Art Conventionally, in order to improve a fish field in the sea, a method of sinking a tetera pot or other small precasts in addition to a wreck, an artificial fish reef on the sea floor to generate upwelling and retain normal temperature water There are known methods for creating
All of these were for transporting what was made on the ground to the fish field and causing it to settle.

[0003]

However, according to the conventional method, since it is necessary to form, assemble and demold the mold of the precast member such as a fish reef, the work of forming the structure is troublesome. , In order to submerge artificial fish reefs made of cement or concrete or other structures made of iron, etc. in the sea, it is necessary to carry them by ships and set them down.
It has a drawback that it requires a large transportation space, the work efficiency is low, and the cost is high. In particular, a large crane is required for transporting to and sunk from the ship. Therefore,
It is an object of the present invention to provide a fish field improved structure and a method for manufacturing the same that can easily carry out the process of forming an artificial fish reef and the like and can easily carry it to and from the ship. ..

[0004]

In the workpiece of the present invention which solves the above problems, the bag 1 having an internal filling shape having a shape or structure according to the purpose of improving the fish field is formed of a sheet material. The bag 1 is filled with concrete or kneaded concrete with fly ash, and the manufacturing method thereof is such that the inner filling shape is formed into a shape or structure according to the purpose of fish field improvement. The bag 1 thus formed is connected to a tube 3 to be settled in water, and a mixture of concrete or concrete containing fly ash is injected into the bag 1 through the tube 3 to form the bag 1. There is.

[0005]

In the method of manufacturing a structure such as an artificial fish reef according to the present invention,
While the bag 1 is connected to the tube 3 and settled in water, when the kneaded concrete is poured into the bag 1 through the tube 3, the bag 1 has a desired internal filling shape. Therefore, when concrete is filled, fish field improvement works such as fish reefs are formed on the seabed. This bag 1
Can be formed of a synthetic resin material or other tough fiber material, so that it can be folded and miniaturized for transportation to a sea area where a fish reef or the like is settled. In addition, this structure does not require assembling of a mold, since the bag body 1 is only filled with concrete.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. When the fluid is filled in the interior, as shown in FIG. 1, for example, by causing it to settle into a seawater area at a water depth of 100 to 150 m at a position of about 20 km offshore, an upwelling current is formed by an internal wave of seawater or an ocean current, and normal temperature water The bag body 1 having the shape of a fish reef block that forms a retention area is formed of a sheet material having air permeability in order to obtain the solidification property of concrete. Further, when the bag 1 is filled with concrete having water-solidifying property, the bag 1 may be formed of a sheet material made of a material having water permeability. That is, it may be formed of a sheet material knitted in a net shape. The bag 1 has a shape of a generally used fish reef for upwelling flow formation, and forms an inclined surface 1b so that the water flow is guided upward from the rising side as shown by an arrow. As a fish reef, fish are easy to come and go, and the hole 1a hidden inside is formed. Further, an injection port 2 for attaching the tip of a tube for injecting concrete or the like is provided at the upper end of the bag body 1.

The bag body 1 formed as described above is transported to a sea area where a fish reef is to be constructed by a concrete loading ship 4 loaded with concrete. At the time of transportation, since the inside of the bag body 1 is not filled, it can be folded and kept small, and a large space is not required for transportation. Then, after connecting the tip of the tube 3 to the inlet 2 of the bag body 1, the bag body 1 is dropped into the sea area where the fish reef is set, as shown in FIG. Concrete is poured from the cement loading ship 4 through the tube 3 to fill the bag body 1.
After that, as shown in FIG. 3, if the tube 3 is removed from the bag body 1 after the concrete is solidified, the fish reef A in which the bag body 1 is filled with concrete is completed on the seabed,
It forms an upwelling stream in which the bottom cold water mass rises in a predetermined sea area, and creates a retention area for normal temperature water.

As the concrete, a special underwater concrete (trade name "Himic", handled by Toyo Construction Co., Ltd.) using a cellulose-based or acrylic-based resin, which has been widely used recently, can be used. In water, it has excellent coagulability, self-leveling property (filling property), strength, long-term fluidity, and non-polluting water quality. As the bag body, those shown in Japanese Examined Patent Publication No. 56-11011, Japanese Utility Model Publication No. 51-112, etc., which are known as cloth frame materials, are used.

Fly ash is produced in large amounts as a waste of coal used as fuel in thermal power plants and the like, and has tended to increase in recent years. The mainstream of the disposal is landfill disposal, which is costly as industrial waste, and although some are used as ceramic products, the amount used is limited because it leads to quality deterioration and high cost of ceramic products. ..

Therefore, if a mixture of concrete and fly ash is used in the bag body 1, fly ash can be effectively used and can be effectively treated. Also,
Fly ash is lighter in weight and therefore easier to carry than normal cement alone. The mixing ratio of cement and fly ash is, for example, 60% cement and 40% fly ash. When the filling is completed and the cement is solidified, fish reef A is completed as shown in FIG. 40% fly ash in the mixture
Although included, the fish reef can maintain sufficient solidification and durability of the whole fish reef due to the high water pressure formed on the seabed. In addition, although an example of the artificial fish reef has been described in the above embodiment, the present invention can be applied to the production and sedimentation of a concrete precast member or the like that becomes a fish nest as it is.

[0011]

According to the present invention configured as described above, the following effects can be obtained. (1) According to the artificial fish reef of the present invention, it is not necessary to form, assemble, and demold the mold of the fish reef, and it is sufficient to simply pour concrete or the like into the bag body. Field-improving structures can be formed. (2) Further, according to the method for manufacturing a structure of the present invention, since the bag body and the concrete may be transported to the sea area where the fish reef is settled, no extra transportation space or means is required, and the conventional sedimentation structure While it was necessary to use a large crane to transport the finished product, it is sufficient to simply carry the bag and concrete when loading it on the ship, even when it is settled in the sea. Since it suffices to drop the concrete and pour the concrete into the bag through the tube, transportation to the ship and settling work from the ship become very easy. (3) The use of concrete containing fly ash as a filler makes it possible to effectively use waste and eliminate the cost of waste disposal, which makes it extremely economical, and because fly ash is lightweight, it is easy to handle. There is. Further, since fly ash itself has a solidifying property, it has an advantage that it is suitable for forming the structure of the present invention together with the action of cement. (4) Since the structure of the present invention is not limited by the size of the mold and the transportation means, a large structure can be constructed. (5) When concrete containing methyl cellulose is used, it has a foaming effect as opposed to fly ash.
Due to the weight reduction of the structure and the porosity of the surface, a microorganism (plankton) adhesion effect occurs.

[Brief description of drawings]

FIG. 1 is a perspective view showing a shape of a bag body.

FIG. 2 is an explanatory view showing a state of manufacturing an artificial fish reef and filling a bag in a sedimentation process.

[Explanation of symbols]

 1 bag 2 inlet 3 tube

Claims (2)

[Claims] 1. A bag body (1) whose inner filling shape has a shape or a structure according to the purpose of fish field improvement, is formed of a sheet material,
A fish field improvement structure obtained by filling the bag body (1) with a mixture of concrete or concrete containing fly ash. 2. A bag body (1) having an inner filling shape formed into a shape or a structure according to the purpose of fish field improvement, connected to a tube (3) and allowed to settle in water to form the bag body (1). A method for producing a fish field improved structure, which comprises injecting a kneaded concrete or concrete containing fly ash through the tube (3).