KR100780877B1 - Production and installation of artificial fishing reef of plain concrete using low-grade iron ore - Google Patents

Abstract

An artificial fishing reef of plant concrete using low-grade iron ore is provided to utilize resources by using low-grade iron ore of an abandoned mine as aggregates and to increase the dead load thereof. A spherical fishing reef body(1) of an artificial fishing reef of plane concrete using low-grade iron ore is formed by using a forming material to have an opening portion(11) on a part of a bottom portion thereof. Low-grade iron ore, water, cement, a water reducing agent and admixture are mixed to form the forming agent. On the circumference of the fishing reef body, several fish entrance holes(12) are formed. Numberless pores for habitation of seaweeds(13) are integrally formed on the fishing reef itself. The pores for habitation of seaweeds are varied according to the mixing ratio of various mixtures.

Description

Production and Installation of Artificial Fishing Reef of Plain Concrete Using Low-grade Iron Ore}

1 is a perspective view of the present invention.

Figure 2 is a longitudinal section and partly enlarged cross-sectional view of the present invention.

Figure 3 is a state diagram when the salvage after the installation of the artificial reef of the present invention in the salvage ball and then installed in the water.

<Explanation of symbols for the main parts of the drawings>

(1): reef body (2): salvage ball

(11): opening 12: fish entrance

(13): seaweed habitat voids (21): netting

(22): ring body (23): link

24: fixture

The present invention relates to a plain concrete artificial reef using low-grade iron ore, artificially installed on the seabed or the sea artificially using low-grade iron ore from the abandoned mines, fishery aimed at attracting, protecting and cultivating the target fishery By manufacturing the artificial reef, which is a facility, without weight (reinforcing bar type), the manufacturing cost of the artificial reef itself can be greatly reduced, and environmental pollution through recycling of resources can be prevented, and the reproduction of copper, phytoplankton and seaweed is promoted. It can be made, excellent in stability, durability and seawater resistance at the time of marine dumping, it is invented to be high-strength and nature-friendly by mixing strong aggregates and mixed materials.

In general, a fishery facility aimed at attracting, protecting, and cultivating aquatic organisms by artificially installing structures on the seabed or in the sea is called artificial reefs. It is installed in a sea of 10 ~ 50m depth and uses fish's instinct to protect itself while staying close to or touching other objects in the sea.

In addition, artificial reefs slow the flow of water and slow down the speed of water, which not only causes the fish to gather but also serves as a spawning ground, where the density of fish is three to four times higher than that of the natural fishery.

That is, artificial reefs are generally installed in order to protect water resources by providing spawning places as well as hiding places of fish, shellfish, etc. inhabiting the near sea, and are also installed to promote the growth of fry through the growth of copper, phytoplankton and seaweeds.

These artificial reefs have to be relatively inexpensive because they are dumped and installed in the ocean, so they must not only have a weight that will not be moved or lost by currents at the time of ocean dumping, but also suitable for spawning, habitat and fishing of marine life. And it must also be made to meet the conditions, such as made of a strong material to sea water.

In particular, it should not be made of materials that could harm marine life.

However, since conventional artificial reefs are mostly made of concrete structures with reinforcing bars for reinforcement, artificial reefs of concrete structures are expensive and are not preferable in terms of economy, and concrete structures with reinforcing bars are strongly alkaline in seawater. Not only is it precipitated, it is particularly weak to salts, so it corrodes quickly and degrades its durability. Also, when toxic substances are deposited, they are harmful to marine organisms. It adversely affects spawning, habitat and fishing.

In consideration of these problems, artificial reefs using waste tires have recently been proposed, and these reefs have the advantages of recycling wastes and being cheap, but they also emit toxic substances in seawater and are difficult to install. It is difficult and easily moved or lost by currents, which is undesirable.

The present invention has been made in order to solve such a conventional problem, by using the low-grade iron ore of the abandoned mines as aggregate, by using a resource of the concrete artificial reef of porous, but without muscle, can be utilized, the artificial fish by the increase of weight Roots of low-grade iron ores that can increase the self-weight of grass to improve the resistance of transverse movements by currents, and can be made of porous rootless concrete to provide habitats for copper, phytoplankton and seaweeds, as well as habitat for fish The purpose is to provide a concrete artificial reef.

That is, the object of the present invention is to significantly reduce the manufacturing cost of the first artificial reef itself, to prevent environmental pollution through the recycling of second resources, to promote the reproduction of third copper, phytoplankton and seaweed, and the fourth marine It is excellent in stability, durability and seawater resistance during dumping, and the fifth is to provide a strength-free concrete artificial reef using low-grade iron ore that can be high-strength and natural-friendly by mixing strong aggregates and mixed materials.

Artificial reefs of the present invention for achieving the above object, by using a molding material containing a low-grade iron ore to form a spherical reef body in which an opening is formed in a portion of the bottom, the fish body has several fish entrance holes It can achieve by forming.

At this time, the reef body itself is characterized in that a number of seaweed habitat voids are integrally provided.

In addition, the artificial reef and the net is installed in a form surrounding the reef body in the bottom blocked state; A ring body installed in the upper opening of the mesh; Several connection rings whose one end is axially spaced around the ring body; It is characterized in that the dumping in the ocean by storing in a lifting tool consisting of a fixture that connects the other end of the connecting ring integrally.

On the other hand, the molding material is a low-grade iron ore 1470kgf / m ³ to 1680kgf / m ³ , water 150kgf / m ³ to 180kgf / m ³ , cement 540kgf / m ³ to 650kgf / m ³ , high-performance water reducing agent having a particle size of 5mm to 13mm 0.65kgf / to have the m ³ to about 2.7kgf / m ³ and admixture 60kgf / m ³ to 72kgf / m less than 2.5cm ³ of a mixture of slump and 210kgf / cm ² or more strength and 0.1cm / sec or more of permeability, that in the The specific gravity of the grade iron ore is 2.5 or more, the wear rate is 40% or less, the moisture absorption rate is 3% or less, and the admixture is formed of silica fume.

In order to achieve the above object, the present invention forms a hollow reef body in which an opening is formed in a portion of the bottom using a molding material by mixing a low-grade iron ore and water, cement, high-performance water-reducing agent and admixture in a predetermined ratio, At the periphery of the body of the reef body provides a plain concrete artificial reef using low-grade iron ore, characterized in that formed several fish entrance holes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows a perspective view of the reef of the present invention, Figure 2 shows a longitudinal cross-sectional view and partly enlarged cross-sectional view of the reef of the present invention, Figure 3 is a salvage after installation of the artificial reef of the present invention in a state that is stored in the net The state diagram of the time is shown.

According to this, the artificial reef of the present invention is a spherical reef body (1) in which the opening 11 is formed in a part of the bottom by using a molding material obtained by mixing low-grade iron ore and water, cement, high-performance water-reducing agent and admixture in a predetermined ratio. To form, but the peripheral portion of the fish body (1) is characterized in that formed several fish entrance holes (12).

At this time, the reef body (1) itself is characterized in that it is integrally provided with a number of seaweed habitat voids 13 that change in response to the mixing ratio of the various mixtures constituting the molding material.

In addition, the body (1) of the artificial reef is characterized in that the dumping in the state stored in the lifting port (2), if necessary during ocean dumping.

The lifting port (2) and the net is installed in a form surrounding the fish body (1) in the bottom portion is blocked (21);

A ring body 22 provided at an upper opening of the mesh 21;

Several connection rings 23 having one end axially spaced apart from the circumference of the ring body 22;

Characterized in that it consists of a fixture 24 to connect the other end of the connecting ring 23 integrally.

On the other hand, low-refined ore 1470kgf / having a 5mm to 13mm particle size material forming the m ³ to 1680kgf / m ^3, water 150kgf / m ³ to 180kgf / m ^3, the cement 540kgf / m ³ to 650kgf / m ^3, superplasticizer 0.65kgf / m ³ to 2.7kgf / m ³ and admixture 60kgf / m ³ to 72kgf / m ^{3 is characterized} by having a slump of less than 2.5cm, strength of 210kgf / cm ² or more and permeability of 0.1cm / sec or more.

At this time, the low-grade iron ore has a specific gravity of 2.5 or more, wear rate is 40% or less, moisture absorption is characterized in that 3% or less.

In addition, the admixture is characterized in that formed of silica fume.

Referring to the operation and effect of the artificial reef of the present invention configured as described above are as follows.

First, the artificial reef form of the present invention is characterized in that a plurality of fish entrance holes 12 are formed at a predetermined magnification in the periphery of the spherical fish body 1 in which the opening 11 is formed in a part of the bottom.

At this time, the size or number of the fish access hole 12 formed in the fish body 1, including the total size or weight of the fish body 1 is inhabited within the size or artificial reef of the fish body 1 itself And the type and size of fish desired for spawning, the depth of the sea to be dumped, and the like.

In addition, the reef body (1) is formed without a reinforcing bar without using a reinforcing bar by using a low-grade iron ore and water, cement, high-performance sensitizers and admixtures mixed in a suitable ratio in a suitable ratio.

In addition, the reef body (1) is a number of seaweed habitat pores (13) that is changed in response to the mixing ratio of the various mixtures constituting the molding material during manufacture is itself formed.

On the other hand, iron ore is generally referred to as iron ore 60% or more of the ore, 40% or less of the poor ore, 25% or less of the low grade light, the poor ore is not used for steelmaking, high-grade ore, It is used in mixing with the buoys, and the low grade light is not used but is deposited around the iron mine, which is the main cause of environmental damage and pollution.

As mentioned above, low grade ore (hereinafter referred to as low grade iron ore), that is, low grade iron ore, is a substitute material for concrete aggregates. The use is very limited.

Therefore, in the present invention, using the molding material containing the low-grade iron ore excellent in specific gravity, wear rate, water absorption as a substitute for natural aggregates to manufacture the myelin sheath body (1) for artificial reefs, iron content of 13% to 25 in the present invention Low grade iron ores in the% range were used for selection.

Molding material used to manufacture the myelin sheath body 1 of the present invention is a low-grade iron ore used as a substitute for the natural aggregate, a cement mixed with water to form a dough, a high-performance water-reducing agent to reduce the amount of water and improve workability and low It has a form in which the admixture which raises the binding force of the iron ore is mixed.

Such a molding material may be mixed using a conventional mixing method, that is, by a mixer, and prepared by mixing the low-grade iron ore, cement, water, a high performance water reducing agent, and a mixed material into a content range suitable for the intended use while stirring for a predetermined time. do.

Molding material used to manufacture such a myelin sheath body (1) has a particle size in the range of 5mm to 13mm using low-grade iron ore deposited in the abandoned mine as a substitute for the aggregate, the weight per unit volume of the low-grade iron ore is 1470kgf / m ³ It is most preferable to select and mix within the range of 1680kgf / m ³ , the specific gravity of the low-grade iron ore is 2.5 or more, the moisture absorption is 3% or less, the wear rate is most preferably used 40% or less.

Table 1 shows the results of the water absorption and wear rate of the low-grade iron ore based on KS F 2503, KS F 2508 and KS F2527-2002.

Item standard Test result Test Methods Water absorption 3% or less 0.3% KS F 2503 Wear rate 40% less than 15% KS F 2508 importance 2.5 or more 3.33 KS F 2527-2002

That is, as shown in Table 1, the water absorption rate, wear rate and specific gravity of low-grade iron ore deposited in the abandoned mines were tested based on KS F 2503, KS F 2508 and KS F 2527-2002. The wear rate is 15% and the specific gravity is 3.3. Therefore, the low-grade iron ore can be used to replace the aggregate used as artificial reefs. When used to manufacture the body of artificial reefs, the wear rate can be significantly reduced compared to porous concrete using general aggregates. In addition, it can greatly enhance the strength and durability of the packaging material.

In addition, since the low-grade iron ore is stored in the abandoned mine area, the hazardous substance dissolution test was carried out to determine whether or not it is contaminated by harmful substances, and the test results are shown in Table 2.

standard result Test Methods Dissolution Test Pb 3mg / l Not detected Waste Process Test Method Cadmium (Cd) 0.3mg / l Not detected Chromium oxide (CrO4) 1.5mg / l Not detected Mercury (Hg) 0.005mg / l Not detected Arsenic (As) 1.5mg / l Not detected Copper (Cu) 3mg / l Not detected

As shown in Table 2, as a result of the hazardous substance dissolution test conducted in accordance with the waste process test method, lead (Pb), cadmium (Cd), chromium oxide (CrO 4), mercury (Hg), arsenic (As), and copper ( Since no harmful substances such as Cu) are detected at all, low-grade iron ores may be used in place of the aggregate of porous concrete used to manufacture artificial reefs by satisfying the standard elution amount of each hazardous substance shown in Table 2.

Aggregate used in the molding material of the present invention is a low-grade iron ore having a particle size in the range of 5mm to 13mm, the pass weight percentage in the checker 20mm is 100%, the pass weight percentage in the checker 13mm is 95 to 100%, The pass weight percentage at 10 mm is 47 to 52%, the pass weight percentage at checker 5 mm is 2 to 5%, and in checker 2.5 it is most preferred to use a pass weight percentage of 0%.

The low-grade iron ore may improve the permeability due to porosity if the particle size range, that is, larger than 13mm, but may decrease the strength, as well as aesthetics of the surface, if less than 5mm, the strength is improved However, after curing the herbaceous body (1), the gap between the low-grade iron ore and the iron ore (13) becomes smaller, so that if the sand or foreign matter penetrates into the voids, they are not discharged, so that many seaweed habitats formed in the reef body (1) itself Since the pores 13 are clogged, the permeability is lowered, and the pores 13 can reduce the rate at which copper, phytoplankton and seaweeds can inhabit, so the required number and amount of pores 13 for seaweed incubation are required. Or it is preferable to mix and select within a range that can satisfy this according to the permeability coefficient and strength.

In addition, the cement included in the molding material used to manufacture the fish body 1 of the present invention is generally used portland cement, the amount of the cement is selected in the range of 540kgf / m ³ to 650kgf / m ³ It is preferable to mix, and the cement is a condition for manufacturing artificial reefs, that is, early strength is required or may be used in the winter season crude steel or super crude steel portland cement, summer heat medium portland cement may be used.

When the amount of the cement mixture is larger than the above range, that is, 650 kgf / m ³ , the binding force between low-grade iron ore and iron ore is increased, but the seaweed habitat voids 13 are relatively small, which satisfies the coefficient of permeability and seaweed habitat voids 13. If the number is less than the above-mentioned range, that is, less than 540kgf / m ³ , the seaweed habitat voids 13 may be relatively large, but the binding strength between the low-grade iron ore and the iron ore may become small, and thus, satisfactory strength may not be obtained. The amount of the mixture is most preferably selected and mixed within the range of 540kgf / m ³ to 650kgf / m ³ .

In addition, the water used in the production of eocho body (1) of the present invention that refined ore 1470kgf / m ³ to 1680kgf / m ^3, the cement 540kgf / m ³ to 650kgf / m ³ compared to 150kgf / m ³ to 180kgf / m ³ Selected and mixed within the range, the water may be used for drinking water does not affect the quality of artificial reefs, even if foreign matters are mixed.

In addition, groundwater, industrial water, river water, etc. may be used. However, when the above groundwater, industrial water, river water, etc. are used, it is preferable to use them after sufficient preliminary examination and inspection so as not to affect the quality of artificial reefs.

If the mixing amount of the water is greater than the above range, that is, 180kgf / m ³ , the strength of the low-grade iron ore or cement may be lowered. If the water is less than the above range, that is, 150kgf / m ³ , the materials may not be uniformly mixed, resulting in poor quality. Can be degraded.

Therefore, a predetermined amount of high performance water reducing agent is added so that the stirring of the materials can be well performed while minimizing the mixing amount of the water.

As described above, the high-performance water reducing agent in the molding material used to manufacture the artificial reef of the present invention in order to minimize the mixing amount of water to be made well, the low-grade iron ore 1470kgf / m ³ to 1680kgf / m ³ , water 150kgf / m ³ to 180kgf / m ³ of cement, and 540kgf / m ³ to 650kgf / m ³ or less when compared to 0.65kgf / m ³ is added, the failure to achieve the air-entraining effect and take effect to expect the enhancement of the strength of concrete When 2.7kgf / m ³ or more is added, the loss of slump according to the elapsed time is excessive and the amount of air is excessively lowered to decrease the strength of concrete. In the manufacture of the artificial reef of the present invention, the amount of the high performance water reducing agent is 0.65kgf / m ³ to It was selected and mixed within the range of 2.7kgf / m ³ .

When the high-performance water reducing agent is mixed as described above, the dispersion action of the cement may be promoted to increase the water-resistance rate compared to the case where the high-performance water reducing agent is not used. Accordingly, the agitation is sufficiently sufficient to significantly increase the strength of the mixed low-grade iron ore or cement. Can be.

In addition, among the various materials used as the molding material of the present invention, the mixed material is uniformly mixed with the cement to further improve the binding force between the low-grade iron ore and the iron ore having a certain void by the cement, the mixing amount of the mixed material is cement and it is most preferred to mix selected within 60kgf / m ³ to 72kgf / m ³ range so that the weight ratio (B / (C + B) ) is 10% to 30% by weight of the admixture on the combined weight of the admixture .

If the mixing amount of the admixture is more than the above range, that is, 72kgf / m ^{3 It} is not good to stir due to the viscosity of the admixture, the quality may be reduced, even if less than 60 kgf / m ³ is mixed satisfactory You won't get strength.

Therefore, the admixture is selected and mixed within the range of 60kgf / m ³ ~ 72kgf / m ³ to sufficiently satisfy the surface strength required in the artificial reefs dumped in the ocean, the admixture is most preferably used that formed of silica fume desirable.

The artificial reef according to the present invention manufactured by using the molding material formed by mixing as described above is hardened after the permeability coefficient is 0.1cm / sec or more, the compressive strength is 210kgf / cm ² or more, the permeability coefficient and compression The strength can be controlled by controlling the particle size of the low grade iron ore and the cement content.

Table 3 shows the results of testing the compressive strength and permeability coefficient of artificial reefs after the mixture prepared by the mixing examples according to the adjustment of the mixing ratio is cured.

Low Grade Iron Ore (G) (13 mm or less) Cement (C) Water (W) Admixtures (B) High Performance Reducer (A / D) Permeability coefficient Compressive strength First Formulation Example 1679kgf / m3 540 kgf / m3 150 kgf / m3 60 kgf / m3 2.7 kgf / m3 0.12 cm / sec 248.1 kgf / cm2 Second Formulation Example 1474kgf / m3 648 kgf / m3 180 kgf / m3 72 kgf / m3 0.65 kgf / m3 0.11 cm / sec 212.5 kgf / cm2

As shown in Table 3, the ratio of the amount of water to the sum of cement and admixture in order to obtain a predetermined permeability coefficient and compressive strength according to the size or location of the artificial reef dumped into the ocean (ie, the depth of the seabed), etc. While maintaining (W / (C + B)) at about 25% by weight, the permeability coefficient and the compressive strength are controlled by adjusting the amount of cement and the blending amount of the high performance water reducing agent to have the necessary permeability coefficient and compressive strength. High performance-high strength porous concrete artificial reef can be produced.

In other words, as the cement content increases, the voids between the low grade iron ore and the iron ore decrease, so that the permeability coefficient decreases, but the compressive strength increases, and when the cement content decreases, the voids between the low grade iron ore and the iron ore increase. Is increased but the compressive strength is lowered to adjust the blending amount according to the predetermined permeability coefficient and the compressive strength according to the location of the artificial reef dumping, etc. The high-performance reducing agent is within the range of 0.54kgf / m ³ ~ 3.25kgf / m ³ By mixing in various mixing ratios according to the strength of the bare concrete artificial reef required by the stiffness, the bare concrete type artificial fish having high strength and high performance using low grade iron ore having permeability coefficient and compressive strength according to the seabed where the artificial reef is dumped Can make candles.

In addition, the compressive strength decreases as the grain size of low grade iron ore increases for the same amount of cement, but the permeability coefficient increases because the void between the low grade iron ore and iron ore increases, whereas the compressive strength increases when the grain size of low grade iron ore decreases. It is preferable to select and use the particle size of low grade iron ore according to the intensity | strength required within the range which a permeability coefficient falls and a permeability coefficient does not fall.

As described above, when mixing of the molding material obtained by mixing low-grade iron ore with water, cement, high-performance water reducing agent, and admixture at a predetermined ratio is completed, it is put into a mold having a shape opposite to that of the fish body 1 for a predetermined time. When cured, the artificial reef hardened | cured to a predetermined form (hollow sphere shape in drawing) can be obtained.

As described above, the plain concrete artificial reef using low-grade iron ore according to the present invention is depleted by recycling resources by using low-grade iron ore that is not used and used as a substitute for molding materials used to produce artificial reefs. Not only the saving of natural aggregates, but also the preservation of the environment, as well as significantly lower wear than artificial reefs manufactured using natural aggregates can have a high strength and durability can significantly extend the life of artificial reefs.

In addition, the artificial reefs of the present invention by using a low-grade iron ore aggregate, the weight of the artificial reefs can be increased due to the increase in weight, thereby improving the resistance of the transverse movement caused by the current, and produced in the form of porous plain concrete It can provide habitats for copper, phytoplankton and seaweeds and provide a living base for fish.

That is, when the low-grade iron ore loaded in the abandoned mines is used as aggregate, the water contained in the low-grade iron ore is supplied to the nutrients of copper, phytoplankton and seaweeds, so that the water quality is improved by increasing dissolved oxygen, and also the food chain. It is ideally formed to enrich fish stocks and increase the income of fisheries workers. The use of low-grade iron ore containing large amounts of Fe as aggregates improves stability during dumping at sea, resulting in the movement and loss of current. The installation cost and maintenance cost can be reduced.

On the other hand, when dumping the artificial reefs of the present invention to the ocean and then, if necessary to dump the spherical reef body (1) without installing a separate device as needed, the weight of the artificial reefs is heavy, separate lifting mechanism The lifting work for the collection of artificial reefs, such as the end of life is difficult to connect to the fish body (1) is very difficult.

Therefore, in the present invention, when the artificial reefs are dumped to the ocean, the reef body 1 is inserted into the lifting port 2 to be dumped, and when lifting the reef body 1 as needed, a lifting device not shown is used. It is possible to minimize the tensile force to artificial reefs by adopting a method of lifting up the lifting port (2) accommodated in the reef body (1), the reef body (1) during burnout or lifting of artificial reefs is damaged or damaged It can be prevented beforehand.

At this time, the lifting tool 2 is provided with a ring body 22 is installed in the upper opening of the mesh 21 is installed in a form surrounding the fish body (1) in the state that the bottom is blocked, the circumference of the ring body 22 One end of the several connecting ring 23 at a predetermined interval is condensed, and the other end of the connecting ring 23 is configured to have a fixture 24 for connecting them integrally.

Therefore, when dumping the artificial reefs of the present invention to the ocean or to lift the artificial reefs from the seabed, the hook body of the lifting device to the hook (23) connected integrally by the fixture 24, or raise the reef body (1) Is to be safely dumped and lifted in a state stored in the net 21 of the lifting port 21.

At this time, the mesh size of the mesh 21 is formed to be at least larger than the size of the several fish entrance hole 12 formed in the reef body (1) by the various kinds of fish in the seabed fish out of the artificial reef of the present invention When the net 21 of the lifting port 2 interferes with the entrance of the fish when entering and exiting the inside and the outside of the fish body 1 through the ball 12, or the fish are caught in the net 21 itself. Etc. can be prevented beforehand.

In addition, the above-mentioned reef body (1) is formed as described above a number of seaweed habitat voids that change in response to the mixing ratio of the various mixtures constituting the molding material during manufacture, so that the artificial reefs of the present invention When dumped on the ground, various fish can be used as a spawning ground, and the habitats of copper and phytoplankton and various seaweeds can be rooted and inhabited in the seaweed pores (13) for the habitat of copper, phytoplankton and seaweed. Will also be performed.

Of course, since the artificial reefs of the present invention also performs the function of habitation and breeding place of copper, phytoplankton and seaweed, various fish can be naturally flocked and used as spawning or habitating place.

On the other hand, the description so far has described only the example in which the shape of the reef body (1) is formed in a spherical shape, not limited to this, it can be produced in various forms, such as rectangular box, rectangular box, triangular pyramid or pyramid shape, It is obvious that such a change can be made by anyone having ordinary skill in the art.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, according to the artificial reef of the present invention, by using the low-grade iron ore accumulated in the abandoned mines as aggregate, the production cost of the first artificial reef itself is greatly improved by manufacturing a concrete artificial reef that is porous and non-reinforcing (without rebar). Second, it can prevent the environmental pollution through the recycling of resources, third, can promote the reproduction of copper, phytoplankton and seaweed, fourth, excellent stability, durability and seawater resistance during ocean dumping, fifth It can be high strength and nature friendly by mixing strong aggregates and miscible materials, and it is a very useful invention such that the artificial reefs can be dumped and lifted safely by storing the sixth artificial reefs in the lifting port and dumping them into the ocean.

Claims (8)

1470kgf / m ³ to 1680kgf / m ³ low grade iron ore with 5mm to 13mm particle size, 150kgf / m ³ to 180kgf / m ³ water, 540kgf / m ³ to 650kgf / m ³ cement, 0.65kgf / m ³ to 2.7kgf / m ³ superplasticizer and 60kgf / m ³ to 72kgf / m ³ molding material having a slump and 210kgf / cm ² or more strength and 0.1cm / sec or more hydraulic conductivity of less than 2.5cm formed by mixing of the admixture of A hollow reef body using a low-grade iron ore, characterized in that to form a hollow reef body having an opening formed in a portion of the bottom portion, a number of fish entrance holes in the periphery of the reef body. The method of claim 1, The reef body itself is a plain concrete type reef using low-grade iron ore, characterized in that a number of seaweed habitat voids are integrally provided. The method of claim 2, The reef body is a plain concrete type reef using low grade iron ore, characterized in that having a spherical shape. The method according to claim 1 or 2, The reef body is a reinforced concrete artificial reef using low grade iron ore, characterized in that the dumping in the ocean in the state stored in the lifting port. The method of claim 4, wherein The salvage sphere, A net installed in a form in which the bottom body is closed and surrounding the fish body; A ring body provided in an upper opening of the mesh; Several connecting rings whose one end is circumscribed around the ring body; Root-free concrete artificial reef using low grade iron ore, characterized in that consisting of a fixture that connects the other end integrally of the connecting ring. delete The method of claim 1, The low-grade iron ore has a specific gravity of 2.5 or more, wear rate is 40% or less, moisture absorption rate is less than 3% concrete-free artificial artificial reef using low grade iron ore. The method of claim 1, The admixture is a plain concrete type reef using low grade iron ore, characterized in that formed of silica fume.

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