JP4736443B2 - Construction method of shallow ground - Google Patents

Description

  The present invention relates to a method for constructing shallow areas and tidal flats in coastal waters and the like.

In general, a shallow area is a shallow sea area that is inundated with an annual depth of 10 to 15 m or less, and a tidal flat is a muddy sandy coast that repeatedly floods and drains due to tides. .
Shallow ground is a water area that serves as a habitat for seaweeds and seaweeds, a habitat and feeding ground for seafood and benthic organisms, and is also a place where the purification of seawater and sediment is carried out through the activities of these organisms. Similarly, tidal flats are also a place of growth and habitat for various seaweeds, seafood and benthic organisms, and recently, the high purification action of seawater by tidal flats has attracted attention. Therefore, it can be said that the existence of shallow areas and tidal flats is very important from the viewpoint of environmental conservation in coastal waters and securing useful marine resources such as seaweed and seafood.

However, in recent years, many shallow areas and tidal flats in coastal waters have been lost due to land reclamation, port development, sludge formation of sediments, sea sand loss, etc. For this reason, attempts to create new shallows and tidal flats have recently been made in various places. In addition, in the inland seas and bays, seawater may become hypoxic, especially in the summer, at relatively deep water depths, and benthic organisms such as clams that migrate to the shallow water and inhabit there. There is a problem that causes drowning. In response to such a problem, attempts have been made to create a shallow field (raise the bottom of the water) in a water area where seawater is poorly oxygenated.
In the conventional construction of shallow tidelands and tidal flats, a method is adopted in which natural sand or natural stones collected at other locations are put into the water area to be created. However, it is not preferable to use natural resources (natural sand, natural stone) as a material for creation in this way, because it involves new natural destruction at the collection site.

On the other hand, dredging is carried out at ports and rivers in various places for the purpose of port maintenance and river maintenance. The amount of soil generated is increasing year by year, making it difficult to secure a disposal site.
Against this background, attempts have been made to use dredged soil as a material for creating shallow fields and tidal flats. In this construction method, a submerged dike is constructed with natural stone to surround the shallow water and the tidal flat, and a paddy layer is formed inside the submerged dike. However, the sea sand is covered on the filling layer, and there is an advantage that a large amount of dredged soil can be used as the filling material and the amount of sea sand used for creation can be reduced ( Non-patent document 1).
“CDIT 2003 No.10” (Journal of Coastal Development Technology Research Center) p.18-19

However, in the above-mentioned preparation method using dredged soil, regardless of the use of high-quality dredged soil with a very small proportion of mud, medium dredged mud generated in dredging such as harbors and rivers When used as a filling material, when large waves are pushed by a typhoon or the like, the construction material (sand cover material, medium filling material) flows out to the surrounding area, or the dredged soil that is the filling material is exposed from the sand covering layer. There is a problem that it is impossible to maintain a shallow environment and a tidal flat. In addition, when a heavy object such as a fish reef block is installed on the sand cover layer, the problem is that the sand cover layer-filled layer cannot support the heavy load, and the heavy object is buried in the cover sand layer or the fill layer. There is also. Furthermore, since a large amount of natural stone and natural sand are used for submerged dikes and sand cover, there is a problem of the procurement source.
Therefore, an object of the present invention is to create a shallow place and tidal flat where a suitable environment for growth and habitat of organisms is maintained over a long period of time without causing problems such as outflow of construction materials in the creation of shallow places and tidal flats using dredged soil. It is to provide a method that can be created.

The features of the present invention for solving the above-described problems are as follows.
[1] Build a submerged dike to prevent outflow of construction material so as to surround shallow waters and / or water areas where tidal flats should be constructed, and fill the inside of the submerged dike to form a filling layer, It is a construction method such as a shallow place in which a sand-covering layer made of blast furnace granulated slag is provided on a packed bed , and the submerged dike is constructed with steel-making slag, and the upper part of the submerged dike is more than 5 mass% in the proportion of particle size exceeding 80 mm. A steelmaking slag having a particle size distribution in which the ratio of the diameter exceeding 50 mm is 10 mass% or more and the ratio of the particle diameter exceeding 30 mm is 45 mass% or more, and the ratio of the particle diameter of 30 mm or less is 85 mass% or more and the particle diameter of 10 mm. A construction method for a shallow place or the like comprising a steelmaking slag having a particle size distribution in which the following ratio is 10 mass% or more, the ratio of particle diameter 5 mm or less is 3 mass% or more, and the ratio of particle diameter 1 mm or less is 1 mass% or more .
[2] A submerged dike for preventing outflow of construction material is constructed so as to surround shallow water or / and the water area where the tidal flat should be constructed, and dredged soil is put inside the submerged dike to form a middle layer, It is a construction method such as a shallow place where a sand-covering layer consisting of an upper layer made of blast furnace granulated slag and a lower layer made of steelmaking slag is formed on the packed bed , and the submerged dike is constructed with steelmaking slag, and the upper part of the submerged dike has a particle size of 80 mm It is composed of a steelmaking slag having a particle size distribution in which the ratio of super is 5 mass% or more, the ratio of particle size of more than 50 mm is 10 mass% or more, and the ratio of particle size of more than 30 mm is 45 mass% or more. A ratio of 85 mass% or more, a ratio of particle size of 10 mm or less is 10 mass% or more, a ratio of particle size of 5 mm or less is 3 mass% or more, and a ratio of particle size of 1 mm or less is composed of steelmaking slag having a particle size distribution of 1 mass% or more. Characteristic construction of shallow fields Method.
[3] Build a submerged dike to prevent the outflow of construction material so as to surround the shallow water or / and the water area where the tidal flat should be built, and put dredged soil and blast furnace granulated slag into the submerged dike sequentially. And a blast furnace water granulated slag layer that is interposed between the clay layers and has a layer thickness smaller than the thickness of the clay layer. It is a construction method such as a shallow place where a sand-covered layer is formed by crushed slag. The submerged dike is constructed of steel slag, and the upper part of the submerged dike is more than 5 mass% in particle size of 80 mm and more than 10 mass in particle size of 50 mm. %, And the ratio of particle size exceeding 30 mm is made of steelmaking slag having a particle size distribution of 45 mass% or more, and the lower part of the submerged dike is 85 mass% or more of particle size of 30 mm or less and the ratio of particle size of 10 mm or less is 10 mass% or more. The ratio of the particle size of 5 mm or less is 3 mass% or more and the particle size of 1 mm or less. A construction method for a shallow place or the like, characterized by comprising a steelmaking slag having a particle size distribution of 1 mass% or more .

[4] Build a submerged dike to prevent outflow of construction material so as to surround the shallow water or / and the water area where the tidal flat should be constructed, and sequentially put dredged soil and blast furnace granulated slag inside the submerged dike. And a blast furnace water granulated slag layer that is interposed between the clay layers and has a layer thickness smaller than the thickness of the clay layer. It is a construction method such as shallow ground where a sand-covering layer consisting of an upper layer made of crushed slag and a lower layer made of steel slag is provided , and the submerged levee is constructed with steel slag, and the upper part of the submerged levee has a ratio of particle size greater than 80 mm is 5 mass% or more , Composed of a steelmaking slag having a particle size distribution in which the ratio of the particle diameter exceeding 50 mm is 10 mass% or more and the ratio of the particle diameter exceeding 30 mm is 45 mass% or more, and the ratio of the particle diameter of 30 mm or less is 85 mass% or more. The ratio of the diameter of 10 mm or less is 10 mass% or more and the particle diameter is 5 mm or less. If the 3 mass% or more, Construction method of Hitoshi Asaba, characterized in that the ratio of the particle diameter of 1mm or less is formed by steel slag having a particle size distribution of more than 1 mass%.
[5] A method for forming a shallow place or the like, wherein the particle size of the steelmaking slag constituting the lower layer of the sand-capping layer is 10 to 80 mm in the method of [2] or [4].
[6] A method for creating a shallow place or the like, wherein in the creation method according to any one of [1] to [5], a seaweed settlement base or / and a fishing reef are installed on the sand-capped layer.
[7] In the creation method of [6] above, the seaweed settlement base and / or the fishing reef is a block of slag generated in the steel manufacturing process, a solidified carbonate block using slag generated in the steel manufacturing process as a main raw material, steel A construction method for a shallow place or the like, characterized in that it is at least one selected from hydrated and cured bodies blocks mainly made of slag generated in the production process.

[8] An artificially constructed shallow beach, tidal flat, or a beach where the shallow and the tidal flat are continuous, and a submerged dike for preventing outflow of the constructed material constructed so as to surround the shallow water and / or the tidal flat. And an inside filling layer formed of dredged soil inside the submerged dam, and a sand-covering layer formed by granulated blast furnace slag provided on the inner filling layer, and the submerged levee is made of steel slag, The upper part of the submerged dike is composed of a steelmaking slag having a particle size distribution in which the ratio of the particle size exceeding 80 mm is 5 mass% or more, the ratio of the particle size exceeding 50 mm is 10 mass% or more, and the ratio of the particle size exceeding 30 mm is 45 mass% or more. Part has a particle size distribution in which the ratio of the particle size of 30 mm or less is 85 mass% or more, the ratio of the particle size of 10 mm or less is 10 mass% or more, the ratio of the particle size of 5 mm or less is 3 mass% or more, and the ratio of the particle size of 1 mm or less is 1 mass% or more. JP that constituted by steel slag having Construction structures and.
[9] An artificially constructed shallow beach, tidal flat, or a beach where the shallow ground and the tidal flat are continuous, and the submerged dike for preventing the outflow of the constructed material constructed to surround the shallow water and / or the tidal flat. And a filling layer formed by dredged soil inside the submerged dam, and a sand-covering layer composed of an upper layer made of granulated blast furnace slag and a lower layer made of steelmaking slag provided on the filling layer , The submerged dike is made of steel slag, and the upper part of the submerged dike has a particle size distribution in which the ratio of particle size over 80 mm is 5 mass% or more, the ratio of particle size over 50 mm is 10 mass% or more, and the ratio of particle size over 30 mm is 45 mass% or more. The lower part of the submerged dike is 85 mass% or more, the ratio of 10 mm or less is 10 mass%, the ratio of 5 mm or less is 3 mass%, and the particle diameter is 1 mm or less. Have a particle size distribution with a proportion of 1 mass% or more Construction structure, characterized in that composed of steel slag.
[10] An artificially constructed shallow beach, tidal flat, or a beach where the shallow and the tidal flat are continuous, and the submerged dike for preventing the outflow of the constructed material constructed to surround the shallow water and / or the tidal flat. And a filling layer formed of clay and blast furnace granulated slag inside the submerged dike, and is interposed between the multiple clay layers and each clay layer, and the layer thickness of the clay layer A submerged layer composed of a blast furnace granulated slag layer that is thinner than the thickness, and a sand-clad layer formed by blast furnace granulated slag provided on the submerged layer ; The upper part is composed of a steelmaking slag having a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. The ratio of the particle size of 30 mm or less is 85 mass% or more, and the ratio of the particle size of 10 mm or less is 1. mass% or more, the following proportions particle diameter 5mm is 3 mass% or more, Construction structure, characterized in that composed of steel slag fraction of particle size 1mm or less has a particle size distribution of more than 1 mass%.

[11] An artificially constructed shallow beach, tidal flat, or a beach where the shallow ground and the tidal flat are continuous, and a submerged dike for preventing outflow of constructed material constructed to surround the shallow water or / and the tidal flat. And a filling layer formed of clay and blast furnace granulated slag inside the submerged dike, and is interposed between the multiple clay layers and each clay layer, and the layer thickness of the clay layer a packed layer in made of a thin water-granulated blast furnace slag layer than the thickness, and a sand layer covering comprising a lower layer by the steel slag layer by water-granulated blast furnace slag provided on the middle packed layer, said Sentsutsumi Steelmaking slag, and the upper part of the submerged dike has a particle size distribution in which the ratio of the particle size exceeding 80 mm is 5 mass% or more, the ratio of the particle size exceeding 50 mm is 10 mass% or more, and the ratio of the particle size exceeding 30 mm is 45 mass% or more. It is composed of slag, and the lower part of the submerged dike has a ratio of particle size of 30mm or less of 85ma. It is composed of steelmaking slag having a particle size distribution in which a ratio of ss% or more and a particle diameter of 10 mm or less is 10 mass% or more, a ratio of a particle diameter of 5 mm or less is 3 mass% or more, and a ratio of a particle diameter of 1 mm or less is 1 mass% or more. The creation structure.
[12] The formed structure according to the above [9] or [11], wherein the steelmaking slag constituting the lower layer of the sand covering layer has a particle size of 10 to 80 mm.
[13] The formation structure according to any one of the above [8] to [12], wherein a seaweed settlement base and / or a fishing reef is installed on the sand cover layer.
[14] In the structured structure according to [13], the seaweed settlement base and / or the fishing reef is a massive slag generated in the steel production process, a solidified carbonate block using slag generated in the steel production process as a main raw material, A structured structure characterized in that it is at least one selected from a hydrated hardened body block made mainly of slag generated in a steel manufacturing process.

  Here, shallow fields and tidal flats refer to the water areas and water beaches (including water areas and water beaches such as lakes, inland seas, and estuaries in the present invention) as described above. A shallow beach, a tidal flat, or a continuous beach. In addition, the creation in the present invention is not only a case where a shallow field or / and a tidal flat is newly created in a deep water area, but the water depth and / or place corresponds to a shallow field or / and a tidal flat. This includes the restoration of water areas and beaches where the growth and habitat environment of living organisms are damaged or lost due to the cause to natural shallow areas and / or tidal flats where the growth and habitat environment of living organisms are good.

According to the inventions according to claims 1, 2 and 8, 9, on the padding layer composed of dredged soil, it has high stability against waves and is less likely to cause consolidation settlement after laying. Blast furnace granulated slag sand-covering layer (all or top layer consisting of blast-furnace granulated slag) that has high functionality as a weight and lid for the padded layer is stabilized. It is possible to reliably prevent dredged soil from being exposed and washed away, and even when heavy objects such as seaweed growth bases and fishing reefs are installed on the sand-covered layer, it is possible to appropriately prevent the burial of these heavy objects. It is possible to create a shallow place where an environment suitable for the growth and habitat of organisms can be maintained over a long period of time. Moreover, according to the invention which concerns on Claim 3, 4 and Claim 10, 11, the shallow field etc. from which the above effects are acquired more notably can be created. Further, in the inventions according to claims 2, 4 and 9, 11, in addition to obtaining the above-described effects by the upper blast furnace granulated slag layer, the steelmaking slag is sulfided as compared with the blast furnace granulated slag. The lower steelmaking slag layer has a large hydrogen suppression effect and hydrogen sulfide fixing action, and the steelmaking slag layer acts as a lid for the filling layer by itself or by solidifying by reacting with clay. Thus, generation of hydrogen sulfide in the filling layer and elution of hydrogen sulfide from the filling layer can be more effectively suppressed.
Further, according to the inventions according to claim 7 and claim 14, it is possible to create a shallow place etc. with 100% recycled material (steel slag + clay) without using natural resources, This is also extremely advantageous from the viewpoints of cost reduction of construction and prevention of environmental destruction due to the use of natural resources.

Hereinafter, an embodiment of the method of the present invention will be described by taking the creation of shallow fields as an example.
1 and 2 show an embodiment of a method for creating a shallow field according to the present invention. FIG. 1 is a schematic longitudinal section of the created shallow field, and FIG. 2 is a plan view of the same.
In general, a place (water area) for creating a new shallow ground is a water area with a relatively large depth facing the coast (for example, a depth of 15 m or more), but is not limited to this, and is not necessarily limited to the coast. It does not have to be a water area. The scale of the shallow ground to be created is arbitrary, but generally a scale of about 100 m to several thousand m on one side is assumed.
The shallow ground (structured structure) created by the method of the present invention includes, as basic components, a submerged dike 1 for preventing the outflow of the generated material, a filling layer 2 formed in the submerged dike 1, It has a sand cover layer 3 provided on the padding layer 2, and more preferably has a seaweed settlement base 4 (and / or fishing reef) installed on the sand cover layer 3.

  In the creation of the shallow field according to the present invention, first, the submerged dike 1 for preventing the outflow of the generated material is constructed so as to surround the water area in which the shallow field is to be created (that is, along the outer edge of the shallow field creation water area). In the present embodiment, as shown in FIG. 2, the submerged dam 1 is composed of three sides excluding the coastline portion in order to create a shallow field having a substantially rectangular shape in the water area facing the coast. The arrangement form of the submerged dike 1 is determined by the shape of the water area (shoreline, seafloor shape, etc.) where the shallow ground is to be created, and is not limited to this embodiment. In the case of creating a shallow place, it may be in a closed form so as to surround the entire water area where the shallow place is to be created.

  Materials and construction methods for constructing the submerged dike 1 are arbitrary. For example, a submerged dike made of cast concrete, natural stone, concrete block, a specific block as described later (for example, slag generated in the steel manufacturing process is used as a main raw material. However, in this embodiment, a solid submerged dike can be used for concrete or natural resources (such as hydrated hardened block made mainly of slag generated in the steel manufacturing process). The submerged dam 1 is constructed from slag generated in the steel manufacturing process from the viewpoint of constructing inexpensively without using natural stone or the like. In order to construct the submerged dam 1 by slag, it is usually a rubble-type inclined levee as in this embodiment.

  There are various types of slag generated in the steel manufacturing process, but as slag that can be used as materials for submerged dike, blast furnace chilled slag generated in a blast furnace (however, this blast furnace chilled slag does not elute S in water. Steel slag (dephosphorization slag, desulfurization slag, desiliconization slag, etc.) generated in processes such as hot metal pretreatment, converter decarburization refining, casting, electric furnace refining, etc. Hot metal pretreatment slag, decarburization slag, cast slag, electric furnace slag, etc.), ore reduction slag, etc., and two or more of these may be used.

  Among these slags, steel slag is particularly preferable, and among these, decarburization slag (converter slag) and dephosphorization slag are particularly suitable. Steelmaking slag (especially decarburized slag, dephosphorized slag) is easily obtained in a lump and has a large specific gravity, so that a solid submerged dike can be constructed by stacking this to a predetermined height, As described below, steelmaking slag is excellent in water purification, and therefore has the advantage of being able to contribute to environmental improvement in water. Steelmaking slag is obtained by solidifying molten slag and mechanically crushing it, and thus has a rugged, irregular shape. For this reason, the internal friction angle when piled up is larger than that of natural stones of the same particle size, and it is possible to construct a submerged dike with a relatively steep structure by reducing the submerged dike width.

Steelmaking slag has a particularly high water purification effect among various slags. That is, in steelmaking slag, (1) Phosphorus in water is adsorbed and fixed by CaO contained in slag, and eutrophication of water is suppressed. (3) Hydrogen sulfide in water is fixed by CaO and Fe ₂ O ₃ contained in the slag, (4) The above (2), ( For the reason of 3), the interstitial water between slag particles is in a state where there is little hydrogen sulfide and much dissolved oxygen, so that organisms settle in the slag gaps, nitrogen and phosphorus fixation by this organism, decomposition of organic matter, supply of oxygen There is a feature that an action such as a water purification action by a high degree can be obtained.

  Further, the water purification action as described above is preferable because steelmaking slag having a relatively large particle size is likely to last for a long period of time. This is because if the steelmaking slag particle size is too small, the sludge deposited on the slag covers the entire surface of the slag layer, and the above-mentioned water purification action and biological habitat in the slag gap This is because the environment is lost. On the other hand, since steelmaking slag has latent hydraulic properties due to alkali stimulation, those having a relatively small particle size tend to solidify in water (slag particles are bonded together).

  Considering the characteristics of steelmaking slag as described above, when the submerged dike 1 is constructed with steelmaking slag, the lower part of the submerged dike contains a considerable amount of steelmaking slag with a relatively small particle size or slag particles with a relatively small particle size. Preferably, the upper part of the submerged dike is made of steelmaking slag having a relatively large particle size or steelmaking slag having a particle size distribution containing a lot of slag particles having a relatively large particle size. By adopting such a structure, it is possible to secure a strong structure by solidifying the steelmaking slag using hydraulic properties at the bottom of the submerged dike. It is possible to prevent the slag from being covered with floating mud by allowing it to enter into the gaps between the large slag particles and biodegrading in the slag gaps. Also, by constructing the upper part of the submerged dike with slag with a large particle size, it is possible to ensure stability against waves and buoyancy due to attached seaweed, so slag outflow and damage to the submerged dike accompanying this・ Can also prevent collapse.

  Specifically, for the upper part of the submerged dike, a steelmaking slag having a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. It is preferable to comprise. Here, the ratio of the particle size of more than 80 mm, the ratio of the particle size of more than 50 mm, and the ratio of the particle size of more than 30 mm are respectively a sieve having a nominal size of 75 mm as defined in JIS Z 8801 (when the particle size exceeds 80 mm). Slag of “on top of sieve” when screened using a screen sieve with a nominal size of 53 mm (when the particle size is over 50 mm) and a screen screen with a nominal size of 31.5 mm (when the particle size is over 30 mm). Refers to the percentage. By using steelmaking slag having such a particle size distribution, the ratio of the settled floating mud that enters the slag gap increases, and the mud is biodegraded just before the slag. It is possible to maintain the purification action and the biohabitat environment for a long time. If the particle size of the steelmaking slag exceeds 200 mm, there is a risk that the floating mud that accumulates on each massive slag will increase and a substantial floating mud layer may be formed on the slag surface. The particle size is preferably about 200 mm as the upper limit (“slag under the sieve” when screened using a screen sieve having a nominal size of 200 mm).

  On the other hand, for the lower part of the submerged dike, from the viewpoint described above, the ratio of the particle diameter of 30 mm or less is 85 mass% or more, the ratio of the particle diameter of 10 mm or less is 10 mass% or more, the ratio of the particle diameter of 5 mm or less is 3 mass% or more, and the particle diameter of 1 mm or less. It is preferable to constitute the steelmaking slag having a particle size distribution of 1 mass% or more. Here, the ratio of the particle diameter of 30 mm or less, the ratio of the particle diameter of 10 mm or less, the ratio of the particle diameter of 5 mm or less, and the ratio of the particle diameter of 1 mm or less are respectively a mesh sieve having a nominal size defined in JIS Z8801 of 31.5 mm. (When the particle size is 30 mm or less), the screen size is also 9.5 mm (when the particle size is 10 mm or less), the screen size is 4.75 mm (when the particle size is 5 mm or less), the same size Indicates the ratio of slag “under the screen” when screened using a 1.18 mm screen (when the particle size is 1 mm or less).

In the present embodiment, the upper portion 10 of the submerged levee 1 (for example, the upper portion of the height of about 10 to 30% of the total height of the submerged levee) has a ratio of the particle size exceeding 80 mm of 5 mass% or more and the ratio of the particle size exceeding 50 mm is 10 mass%. As mentioned above, it comprises with the steelmaking slag which has a particle size distribution whose particle size exceeds 30 mm, and the ratio of the particle size 30 mm or less is 85 mass% or more, and the ratio of particle size 10 mm or less is 10 mass% or more. The steelmaking slag has a particle size distribution in which the ratio of the particle diameter of 5 mm or less is 3 mass% or more and the ratio of the particle diameter of 1 mm or less is 1 mass% or more. Further, the submerged dike lower part 11 has a two-stage structure in order to improve stability. The structure of the submerged dike lower part 11 may be three or more.
The particle size adjustment of the steelmaking slag can be carried out by cooling and solidifying the molten slag, crushing it to an appropriate size with a heavy machine or a crushing plant, and sizing using, for example, a predetermined sieve mesh. Moreover, as a method of obtaining steelmaking slag with a large particle size, when cooling and solidifying, the method of flowing molten slag to a yard etc. and making the thickness thick can be taken.
In addition, various slags including steelmaking slag may be used after hydration treatment, carbonation treatment, aging treatment, hydration hardening, carbonation hardening and the like.

The size of the submerged dike 1 constructed using slag is arbitrary, but in terms of stability as a structure in the case of a rubble-type inclined dike, stability against waves during a typhoon, etc. When the total height is about 8 m to 20 m, it is preferable that the bottom end width is 20 m to 40 m and the top end width is about 1 m to 4 m.
Moreover, since the water depth at the top of the submerged levee 1 is generally set within 5 to 7 m at which the seaweed or seagrass can grow by photosynthesis, the water depth at the highest water depth of the sand cover layer 3 is at least the sand cover layer 3. The height is set so as to prevent the outflow. Further, the height of the crest 1 of the submerged dike 1 may be set higher (smaller water depth) than the viewpoint of preventing the sand covering layer 3 from flowing out in order to prevent the entry of the poor oxygen water mass.
In order to construct the submerged dam 1 with slag, for example, slag may be thrown into the construction site from a gut ship.

After constructing the submerged dike 1 as described above, the clay layer 2 is formed by putting clay as an intermediate filler inside. This filling layer 2 is formed to fill most of the water depth inside the submerged dike, and usually depends on the scale and depth of the sea bottom, but usually compared to the sand-covered layer 3 formed on the top layer. A much thicker layer. In general, the filling layer 2 occupies a thickness of 80% or more of the water depth inside the submerged dike that needs to be filled with the building material.
The clay may be subjected to a drying process (for example, sun drying) or a dehydration process (a method of dehydrating and reducing the volume after adding a chemical to agglomerate).

Moreover, when forming the filling layer 2, you may throw the solidification material into a submerged dike with a clay. The solidifying material is not particularly limited as long as it has hydraulic properties, and examples thereof include slag generated in steel manufacturing processes such as cement, lime, and steelmaking slag, concrete waste, and the like. The above can be used. Moreover, you may use additives, such as a modifier, a foam agent, and a foam bead, with this solidification material.
In this way, by adding the solidified material together with the clay and forming the filling layer 2, the strength of the clay is enhanced by the solidifying material, so that the filling layer is further stabilized, and the clay is exposed and washed away. Can be prevented more reliably.

As slag used as a solidification material, blast furnace slow cooling slag generated in a blast furnace (however, this blast furnace slow cooling slag is preferably sufficiently aged in order to prevent the elution of sulfides in water), hot metal preliminary treatment Steelmaking slag generated in processes such as converter decarburization refining, casting, electric furnace refining (hot metal pretreatment slag such as dephosphorization slag, desulfurization slag, desiliconization slag, decarburization slag, casting slag, electric furnace slag, etc.) Ore reduction slag and the like, and two or more of these may be used. Among these slags, steel slag is particularly preferable, and among these, decarburization slag (converter slag) and dephosphorization slag are particularly suitable. In order to obtain a sufficient effect, it is preferable to use a slag having a granular shape.
When the solidifying material is added together with the dredged soil, the solidified material is generally mixed with the dredged soil and then poured into the submerged dam 1. The method of mixing the solidified material with the clay is optional, such as a method of mixing using a mixing processing facility or the like in advance, and a method of mixing at the time of charging into the submerged dike. Moreover, what is necessary is just to select suitably the mixing rate with respect to the clay of the solidification material according to the desired intensity | strength of the filling layer 2. FIG.

  As another form, the filling layer 2 may be formed by laying the solidified material and the clay in layers. That is, the clay and the solidifying material are sequentially added to the inside of the submerged dike 1, and a multilayered clay layer and a solidified material layer that is interposed between the clay layers and whose layer thickness is thinner than the layer thickness of the clay layer. The filling layer 2 is formed. According to such a structure of the filling layer 2, the solidified material layer interposed between the multiple clay layers improves the strength of at least a part of the clay layer in contact therewith. And the whole filling layer will be restrained by the layer part which the intensity | strength improved in this way, and the uppermost sand-covering layer 3, Thereby, the fluidization of the filling layer 2 can be suppressed effectively. it can. The solidifying material layer formed in the filling layer 2 can be one layer or any number of layers of two or more, but in order to restrain the filling layer 2 more stably, two or more layers, preferably It is preferable to provide three or more layers.

In addition, the thickness of the kneaded material layer and the solidified material layer when the solidified material layer is provided is arbitrary, but the solidified material layer functions sufficiently even if the layer thickness is relatively small. For the purpose of the present invention to use as a material, the layer thickness of the solidified material layer is made thinner than the layer thickness of the clay layer. Generally, the clay layer may be 1 to 5 m thick and the solidified material layer may be about 10 cm to 1 m thick.
A typical form in which the solidification material is put together with the clay inside the submerged dike is as follows: (1) A form in which the clay mixed with the solidification material is thrown to form at least a part of the filling layer 2; (2) The clay and the solidifying material are sequentially added, and the filling layer is composed of a multilayered clay layer and a solidified material layer interposed between the clay layers and having a layer thickness smaller than the thickness of the clay layer. There are forms that form at least a part of 2. However, as modifications, for example, the following various forms can be adopted.

(a) Filling layer 2 consisting of a clay layer in which the lower layer is not mixed with a solidifying material, and an upper layer consisting of a clay layer in which the solidifying material is mixed
(b) Filling layer 2 consisting of a clay layer in which the lower layer is mixed with a solidifying material and an upper layer consisting of a clay layer in which the solidifying material is not mixed
(c) Filling layer 2 in which the lower layer is a layer in which a solidified material and clay are laminated (layer in the form of (2) above), and the upper layer is a layer of clay in which the solidified material is mixed.
(d) Filling layer 2 consisting of a clay layer in which the lower layer is mixed with a solidifying material, and an upper layer in which the solidified material and the clay are laminated (layer in the form (2) above)
(e) Filling layer 2 consisting of multiple layers of clay mixed with solidifying material, each layer having different mixing ratio of solidifying material
(f) Filling layer 2 comprising a plurality of layers made of clay mixed with a solidifying material, and a solidifying material layer interposed between these layers.

Next, a blast furnace granulated slag is laid on the filling layer 2, and a sand covering layer 3 made of the blast furnace granulated slag is provided.
Granulated blast furnace slag is one in blast furnace slag of steelmaking slag system a slag solidified by water砕化treatment, the particle size is greater than the sea sand (typically, 1.0 to the D ₅₀ The particle size is about 2.0 mm), and the true specific gravity is slightly larger than sea sand. Furthermore, a major feature of the blast furnace granulated slag is that the slag particles have an angular shape, and because of this shape, the physical characteristics of a large internal friction angle and high shear resistance. have.

  The ground cover layer 3 of blast furnace granulated slag having such a physical property itself has high stability against waves and is unlikely to cause consolidation settlement after laying. In addition, the weight and lid of the lower layer (filled layer) As a high functionality. Therefore, (1) the sand-clad layer of granulated blast furnace slag, which is generally formed on the top of the padded layer made of dredged soil containing a lot of floating mud, stabilizes the padded layer and effectively exposes and drains the dredged soil. (2) Even if heavy objects such as seaweed settlement bases and fishing reefs, which will be described later, are installed on the sand cover layer, there is an effect that these heavy objects are hardly buried. Is the greatest feature of the present invention.

  In addition, the sand-covering layer is preferably the basis for the settlement of seagrasses such as eelgrass, but the sand-covering layer 3 of the granulated blast furnace slag is highly stable against waves as described above, and for the following reasons It is excellent in seagrass settlement. In other words, seaweeds such as sea cucumber grow and proliferate by extending rhizomes and roots to the bottom sediment and entwining them with the bottom sediment constituent material so that they do not easily escape from the bottom sediment due to waves. However, when the bottom sediment is sand, there is a problem that the rhizome is easily removed from the bottom sediment due to waves and the like, and seaweeds are difficult to grow. On the other hand, blast furnace granulated slag has higher shear resistance than sea sand due to the above-mentioned particle shape, so seagrass has a strong binding force against waves, etc. Hard to be pulled out. In addition, due to its unique particle shape and moderate roughness, the rhizomes and roots of seaweeds are more likely to be entangled than sea sand, and by serving as their anchors, it is difficult to escape seagrasses. In particular, the latter greatly contributes to the establishment of seaweeds immediately after germination.

  Furthermore, the following effects can be obtained by providing the sand cover layer 3 of granulated blast furnace slag. (1) Blast furnace granulated slag is vitreous with a porous structure for manufacturing reasons, and the slag particles have an angular shape (a shape having a number of sharp parts on the surface). The sand cover layer 3 of granulated blast furnace slag has a large slag gap and is excellent in water permeability. For this reason, the water in the slag gap is easily replaced, and the dissolved oxygen concentration in the gap is sufficiently ensured, so that a good environment is provided to organisms living in the sediment. (2) A small amount of Ca from glassy slag particles is slowly eluted over a long period of time, so that the pH in the pore water is maintained at about 8.5. Effectively suppressed. (3) By covering the organic matter (sludge content) contained in the dredged soil of the filling layer 2, elution of phosphate and nitrogen compounds that cause eutrophication can be suppressed.

As granulated blast furnace slag, as-produced, ground iron (iron) removed, crushed such as lightly crushed, crushed such as lightly crushed before or after removal of ground iron, by carbonation treatment Any of those having a carbonic acid film formed on the surface may be used. Since granulated blast furnace slag is generated in large quantities in the steel manufacturing process, it is a material that can be obtained in large quantities at low cost.
The thickness of the sand covering layer 3 of the granulated blast furnace slag is not particularly limited, and may be appropriately selected according to the thickness of the clay (filled layer 2) from the above-described function, but is usually more preferably 30 cm or more. Is preferably 70 cm or more.
The sand-covering layer 3 is preferably a deep water zone in which the amount of light necessary for the growth of seaweed and seaweed is secured, and it is usually preferable that the water depth is about 5 to 7 m at the deepest part.

In this invention, it may replace with the sand cover layer 3 which consists of a blast furnace granulated slag as mentioned above, and may provide the sand cover layer which consists of the upper layer by a blast furnace granulated slag, and the lower layer by steel-making slag. FIG. 3 shows one embodiment of the present invention, which is a schematic cross-sectional view of a shallow field formed. The sand covering layer 3 is composed of an upper layer 3a made of blast furnace granulated slag and a lower layer 3b made of steelmaking slag.
Steelmaking slag is more effective in suppressing the generation of hydrogen sulfide and fixing hydrogen sulfide than blast furnace granulated slag, and has the property of being easily solidified in the sea due to its hydraulic properties. Therefore, the above-mentioned specific operation and effect can be obtained by configuring the upper layer 3a of the sand-capping layer 3 with blast furnace granulated slag, and the formation of hydrogen sulfide can be suppressed by configuring the lower layer 3b of the sand-clad layer 3 with steelmaking slag. In addition, the steelmaking slag layer can act as a lid for the filling layer by itself or by solidifying by reacting with the clay, so that the sulfurization in the filling layer Generation of hydrogen and elution of hydrogen sulfide from the filling layer can be more effectively suppressed.

As mentioned above, as steelmaking slag, various types of slag (dephosphorization slag, desulfurization slag, desiliconization slag, etc.) generated in the processes of hot metal pretreatment, converter decarburization refining, casting, electric furnace refining, etc. Slag, decarburized slag, cast slag, electric furnace slag, etc.), and two or more of these may be used. Of these steelmaking slags, decarburization slag (converter slag), dephosphorization slag and the like are particularly suitable.
There is no particular restriction on the particle size of the steelmaking slag, but in order to prevent the steelmaking slag having hydraulic properties from solidifying appropriately by itself or reacting with the clay, while not excessively increasing the pH of the surrounding water, It is preferable to use steelmaking slag having a particle size of about 10 to 80 mm, desirably about 10 to 50 mm. Here, a particle size of 80 mm or less and a particle size of 50 mm or less means a screen sieve having a nominal size of 75 mm (when the particle size is 80 mm or less) specified in JIS Z 8801, respectively, and a screen sieve having a nominal size of 53 mm (particle size of 50 mm). It means “under the sieve” when sieving using the following case). Further, the particle size of 10 mm or more means “on the sieve” when the sieve is screened using a mesh sieve having a nominal size specified in JIS Z 8801 of 9.5 mm.

As described above, there is no particular limitation on the thickness of the sand covering layer 3 when the sand covering layer 3 is composed of the upper layer 3a made of blast furnace granulated slag and the lower layer 3b made of steelmaking slag. Although it may be appropriately selected according to the thickness of the filling layer 2), it is usually 30 cm or more, more preferably 70 cm or more. The layer thickness ratio between the upper layer 3a and the lower layer 3b is preferably about upper layer 3a / lower layer 3b = 3/7 to 7/3.
The steelmaking slag may be hydrated, carbonated, aged, hydrated, carbonated, or the like.

To insert and lay filling materials (such as dredged soil) and sand-clad materials (such as blast furnace granulated slag) inside the submerged levee 1 according to the present invention, for example, a tremy pipe is extended from the ship to the bottom of the water. For example, a method of introducing a material through a pipe, a method of directly introducing a material from a gut ship after installing a pollution prevention film around the gut ship, and the like can be employed.
Furthermore, it is preferable to install a seaweed settlement base 4 (or / and a fishing reef) on the sand-clad layer 3 to prepare a growth and habitat environment for seaweeds and seafood. The seaweed settlement base and fishing reef can be composed of natural stones, blocks (for example, concrete blocks), steel structures, etc., but in particular, the lump formed in the steel manufacturing process as described above. It is preferable to use a slag, a carbonate solid body block using slag (steel slag) generated in the steel manufacturing process as a main raw material, or a hydrated hardened body block using steel slag as a main raw material. Of these, a solidified carbonate block using steel slag as a main raw material is particularly preferable, and this block is arranged in this embodiment.

For the massive slag generated in the steel manufacturing process, the slag as described for the submerged dam 1 can be used.
Moreover, as the carbonate solid body block obtained by carbonizing the steel slag which is the main raw material, for example, the powdery raw material which uses steel slag as the main raw material proposed by the patent 3175694 is produced | generated by carbonation reaction. CaCO ₃ (optionally further MgCO ₃₎ obtained by can be used as the so consolidated as a main binder, were agglomerated. Steel slag includes various types of slag as mentioned above, that is, granulated blast furnace slag and blast furnace slow-cooled slag generated in the blast furnace, decarburized slag, dephosphorization generated in processes such as pretreatment, converter and casting. Steelmaking slag such as slag, desulfurization slag, desiliconization slag, cast slag, ore reduction slag, electric furnace slag, and the like can be used.

The carbonate solid block (stone) obtained by carbonizing such steel slag is (1) most of CaO contained in the slag (or Ca (OH) ₂ generated from CaO) into CaCO ₃ . Because it changes, the pH of seawater can be prevented from rising due to CaO. (2) The slag contains an appropriate amount of iron (especially metallic iron, metal-containing iron), and this iron is eluted in the seawater. As a nutrient salt, iron is replenished, and this effectively works for the growth of seaweeds. (3) The block obtained by carbonizing slag has a porous property as a whole (surface and inside). For this reason, seaweeds are easy to adhere to the stone surface, and the inside of the stone is also porous, so components that are effective in promoting the growth of seaweed contained in the stone (for example, silicate ions and iron) are seawater. It is easy to elute in By effectively functions as aerial base and reef seaweed.

Moreover, the hydration hardening block which uses steel slag as a main raw material is obtained by hydrating and hardening a raw material containing steel slag as a main raw material (aggregate and / or binder). Slag, blast furnace granulated slag generated in blast furnace, blast furnace slow-cooled slag, decarburized slag, dephosphorized slag, desulfurized slag, desiliconized slag generated in processes such as pretreatment, converter, casting, etc. Steelmaking slag such as cast slag, ore reduction slag, electric furnace slag, and the like can be used. In the production of a block by hydration curing, the raw material is kneaded with water, then placed in a mold and usually cured for 1 to 4 weeks to produce the block.
In addition to the above-mentioned fine powder of granulated blast furnace slag, as a binder used for the block, silica-containing substances (for example, clay, fly ash, silica sand, silica gel, silica scum), cement, slaked lime, NaOH, etc. are appropriately used. It can also be used in combination.

When installing a block on the sand covering layer 3, each block may be installed on the sand covering layer 3, and a plurality of blocks may be stacked or assembled. In particular, when a block has a function as a fishing reef, it is preferable to form a space part where a plurality of blocks can be stacked or assembled so that seafood can live between the plurality of blocks.
Moreover, when installing block slag and a natural stone, it can take arbitrary installation forms, for example, pile them up in a mountain shape, or put and install them, such as a wire netting.
In this embodiment, a plurality of carbonate solidified blocks are arranged on the sand covering layer 3 near the submerged dam 1 at an appropriate interval (for example, an interval of 1 m or more).

FIG. 4 shows another embodiment of the shallow field creation method according to the present invention, and is a schematic longitudinal section of the created shallow field.
In this embodiment, in order to particularly stabilize the filling layer 2 (the clay), the clay and the granulated blast furnace slag are sequentially placed inside the submerged dike 1 to form a multilayered clay layer 20 and each of these layers. A filling layer 2 is formed which comprises a blast furnace granulated slag layer 21 interposed between the clay layers 20 and having a layer thickness smaller than the layer thickness of the clay layer 20. A sand covering layer 3 made of slag is provided.

According to such a structure of the filling layer 2 of this embodiment, the granulated blast furnace slag layer 21 interposed between the multiple layers 20 of the clay layer 20 is overlapped and covered with the clay layer 20 in each lower layer. In addition to fulfilling the function, the entire filling layer is constrained by the blast furnace granulated slag covering sand layer 3 in the uppermost layer and the blast furnace granulated slag layer 21 in the filling layer 2. Can be effectively suppressed.
The granulated blast furnace slag layer 21 formed in the filling layer 2 can be one layer or any number of layers, but two or more layers can be used to more stably restrain the filling layer 2. Preferably, three or more layers are provided.

The layer thickness of the dredged soil layer 20 and the blast furnace granulated slag layer 21 is also arbitrary, but the blast furnace granulated slag layer 21 functions sufficiently even if the layer thickness is relatively small. For the purpose of the present invention to be used as a material, the thickness of the granulated blast furnace slag layer 21 is made thinner than that of the clay layer 20. Generally, the clay layer 20 may have a thickness of about 1 to 5 m and the blast furnace granulated slag layer 21 may have a thickness of about 10 to 50 cm.
Other configurations and preferable conditions of this embodiment are the same as those of the embodiment of FIGS. Therefore, at least a part of the clay layer 20 may be formed by adding the solidification material together with the clay. The kind of the solidifying material and the charging form are the same as those described in the embodiment of FIGS. That is, as a typical form when the solidification material is added together with the clay, (1) a form in which the clay mixed with the solidification material is charged to form at least a part of the clay layer 20, (2 ) The clay and the solidifying material are sequentially added, and the clay layer 20 is formed by a multilayered clay layer and a solidified material layer interposed between the clay layers and having a layer thickness smaller than that of the clay layer. There are forms that form at least a part, but as modifications thereof, for example, the following various forms can be adopted.

(a) A form having a clay layer 20 not mixed with a solidifying material on the lower layer side of the filling layer 2 and a clay layer 20 mixed with a solidifying material on the upper layer side
(b) Form having the clay layer 20 mixed with the solidifying material on the lower layer side of the filling layer 2 and the clay layer 20 not mixing the solidifying material on the upper layer side
(c) It has the clay layer 20 (the clay layer of the form of said (2)) which laminated | stacked the solidification material and the clay on the lower layer side of the filling layer 2, and mixed the solidification material on the same upper layer side. Form having the clay layer 20
(d) A clay layer 20 in which a solidification material is mixed on the lower layer side of the filling layer 2 and a solidification layer 20 in which the solidification material and the clay are laminated on the upper layer side (in the form of (2) above) Forms with (soil layer)
(e) A form having a plurality of clay layers 20 mixed with a solidifying material, each layer having a different mixing ratio of the solidifying material
(f) Form having a clay layer 20 in which a clay layer mixed with a solidification material and a solidification material layer are laminated Also in the embodiment of FIG. 4, a sand-covering layer made of blast furnace granulated slag as described above Instead of 3, a sand covering layer 3 composed of an upper layer 3a made of blast furnace granulated slag and a lower layer 3b made of steelmaking slag as shown in FIG. 3 may be provided. The steelmaking slag used in this case and preferable production conditions are the same as those in the embodiment of FIG.

  In the creation of a shallow field according to the method of the present invention, as in the above-described embodiments, the submerged levee 1 is constructed of steel slag, and the seaweed settlement base 4 (or fishing reef) installed on the sand cover layer 3 is a massive slag, slag By using one or more of the carbonate solidified block made of slag as a main raw material, and the hydrated cured block made of slag as a main raw material, preferably a carbonate solidified block made mainly of slag without using natural resources. % Recycle material (steel slag + dredged soil) can be used to create a shallow field, which is extremely advantageous from the standpoints of effective use of recycle material, cost reduction of construction, and prevention of environmental destruction due to the use of natural resources.

Here, assuming that 100% recycled material (steel slag + clay) is used as the building material in the building method of the present invention, for example, a shallow area of about 100 m × 100 m (1 ha) in a water area with a water depth of 15 to 20 m. As a rough estimate, about 100,000 tons of steelmaking slag for submerged dike, about 100,000 m ³ of dredged soil for filling, and blast furnace granulated slag or blast furnace granulated slag and steelmaking slag for covering sand are used. Approximately 25,000 tons, about 100 to 200 slag carbonate solidified blocks (1 to 5 t / piece) will be used for the seaweed agglomeration base, and an excellent structure is created using a large amount of recycled resources. It is very useful in that it can be.

As part of the creation of the shallow ground, seaweeds such as sea bream and seaweeds such as seaweed, arame, kajime and hondawala may be transplanted to the sand-covering layer 3 and the seaweed settlement base 4.
The shallow ground created as described above becomes a place where various organisms grow and inhabit, and can also be used as a production place for useful marine resources such as clams and seaweed.
The object of creation according to the present invention is not limited to the shallow ground as described in the above embodiment, but may be a tidal flat or a water beach where the shallow ground and the tidal flat are continuous. In addition, the target of creation includes not only sea areas and beaches, but also water areas and beaches such as lakes, inland seas, and estuaries.
In addition, examples of water areas to be constructed include water areas that are not used for fisheries in the deep water areas facing the coast, and water areas that are not used for fisheries due to sludge bottom sediments that are shallow in depth. These include, but are not limited to, waters where hypoxia is likely to progress during the summer, and existing shallow and tidal flats that need to be regenerated and restored.

Moreover, the shallow ground (created structure) created by the method of the present invention has the following configuration.
(1) An artificially constructed shallow beach, tidal flat, or a beach where the shallow ground and the tidal flat are continuous, and a submerged dike to prevent outflow of the constructed material constructed so as to surround the shallow water and / or the tidal flat. And a padding layer formed of dredged soil inside the submerged dam, a sand-covering layer made of blast furnace granulated slag or an upper layer made of blast furnace granulated slag provided on the filling layer, and a lower layer made of steelmaking slag A constructed structure having a sand covering layer.
(2) An artificially constructed shallow beach, tidal flat, or a beach where the shallow ground and the tidal flat are continuous, and a submerged dike for preventing outflow of the constructed material constructed so as to surround the shallow water and / or the tidal flat. And a filling layer formed of clay and blast furnace granulated slag inside the submerged dike, and is interposed between the multiple clay layers and each clay layer, and the layer thickness of the clay layer A filling layer composed of a blast furnace granulated slag layer thinner than the thickness, and a sand covering layer composed of a blast furnace granulated slag provided on the filling layer, or an upper layer composed of a blast furnace granulated slag and a lower layer composed of a steelmaking slag And a built structure.

(3) In the above (1) or (2), the subsidence is a constructed structure made of slag generated in the steel manufacturing process.
(4) The constructed structure according to (3), wherein the slag is steel slag.
(5) In the above (4), the upper part of the submerged dike has a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. A built structure composed of steelmaking slag.
(6) In the above (5), the ratio of the lower part of the submerged dike is 85 mass% or more, the ratio of the particle diameter of 10 mm or less is 10 mass% or more, the ratio of the particle diameter of 5 mm or less is 3 mass% or more, and the particle diameter is 1 mm. A formed structure composed of steelmaking slag having a particle size distribution with the following ratio of 1 mass% or more.

(7) The constructed structure according to any one of (1) to (6) above, wherein a seaweed settlement base and / or a fishing reef is installed on the sand-covering layer.
(8) In the above (7), the seaweed settlement base and / or the fishing reef is a block of slag generated in the steel manufacturing process, a carbonate solid block made mainly of slag generated in the steel manufacturing process, and a steel manufacturing process. A built-up structure that is at least one selected from hydrated and cured blocks made mainly from the generated slag.
(9) The constructed structure according to (8), wherein the seaweed settlement base and / or fishing reef is a carbonate solidified block made mainly of slag generated in the steel manufacturing process.

The form of the submerged dike as described above is not limited to the construction method or construction structure of the shallow ground according to the present invention, but various submerged dike constructed for other forms of shallow ground construction or other purposes. Can be applied. In this case, it is particularly preferable to construct the submerged dike with the steelmaking slag and to configure the upper part of the submerged dike and the lower part of the submerged dike with the steelmaking slag having a specific particle size distribution for the reasons described above. Therefore, it is preferable that the construction technique of a submerged dike constituted by steelmaking slag and the construction technique such as shallow ground using the same have the following configuration.
(1) The submerged dike is constructed of steel slag. At that time, the upper part of the submerged dike is 5 mass% or more with a particle size of more than 80 mm, 10 mass% or more with a particle size of more than 50 mm, and 45 mass with a particle size of more than 30 mm. A construction method of a submerged dike characterized by comprising steelmaking slag having a particle size distribution of at least%.

(2) In the above (1), the ratio of the particle diameter of 30 mm or less is 85 mass% or more, the ratio of particle diameter of 10 mm or less is 10 mass% or more, the ratio of particle diameter of 5 mm or less is 3 mass% or more, and the particle diameter is 1 mm. A construction method of a submerged dike characterized by comprising steelmaking slag having a particle size distribution of the following proportion of 1 mass% or more.
(3) It is made of steelmaking slag, and the upper part of the submerged levee has a particle size distribution in which the ratio of the particle size exceeding 80 mm is 5 mass% or more, the particle size exceeding 50 mm is 10 mass% or more, and the particle size exceeding 30 mm is 45 mass% or more. A submerged dike characterized by comprising steelmaking slag.
(4) In the above (3), the ratio of the submerged dike is 85 mass% or more, the ratio of the particle diameter of 10 mm or less is 10 mass% or more, the ratio of the particle diameter of 5 mm or less is 3 mass% or more, and the particle diameter is 1 mm. A submerged dike characterized by being composed of steelmaking slag having the following proportion of particle size distribution of 1 mass% or more.

(5) A submerged dike is constructed with steelmaking slag so as to surround shallow water and / or water areas where tidal flats should be constructed. At that time, the upper part of the submerged dike is more than 5 mass% with a particle size of more than 80 mm. , Composed of steelmaking slag having a particle size distribution with a particle size of more than 50mm and a particle size distribution of more than 10 mass% and a particle size of more than 45mm%. A method for creating a shallow place or the like, characterized by forming a layer.
(6) In the above (5), at the lower part of the submerged dike, the ratio of the particle diameter of 30 mm or less is 85 mass% or more, the ratio of the particle diameter of 10 mm or less is 10 mass% or more, the ratio of the particle diameter of 5 mm or less is 3 mass% or more, and the particle diameter is 1 mm. A construction method for a shallow place or the like, characterized by comprising a steelmaking slag having a particle size distribution of the following proportion of 1 mass% or more.
(7) A method for creating a shallow place or the like, characterized in that in (5) or (6) above, a sand-covering layer is provided on the filling layer.

(8) An artificially constructed shallow beach, tidal flat, or a beach where the shallow ground and the tidal flat are continuous, and a submerged dike for preventing the outflow of the constructed material constructed so as to surround the shallow water and / or the tidal flat. And a filling layer formed on the inner side of the submerged dike, and the upper part of the submerged dike has a ratio of a particle size of more than 80 mm of 5 mass% or more, a ratio of a particle size of more than 50 mm of 10 mass% or more, and a particle size of more than 30 mm. A formed structure characterized by comprising a steelmaking slag having a particle size distribution of 45 mass% or more.
(9) In the above (8), the lower part of the submerged dike is 85 mass% or more with a particle size of 30 mm or less, 10 mass% or more with a particle size of 10 mm or less, 3 mass% or more with a particle size of 5 mm or less, and 1 mm particle size. A formed structure characterized in that the following ratio is constituted by a steelmaking slag having a particle size distribution of 1 mass% or more.
(10) The constructed structure according to (8) or (9), wherein a sand-covering layer is provided on the filling layer.

1 shows an embodiment of a method for creating a shallow field according to the present invention, and is a schematic cross-sectional view of the created shallow field. FIG. 1 is a plan view of a shallow field created in the embodiment of FIG. Another embodiment of the shallow field creation method according to the present invention is shown, and a schematic sectional view of the shallow field created is shown. Another embodiment of the shallow field creation method according to the present invention is shown, and a schematic sectional view of the shallow field created is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submerged dike 2 Filled layer 3, 3a, 3b Sand cover layer 4 Seaweed settlement base 10 Upper submerged 11 Lower submerged 20 Soil layer 21 Blast granulated slag layer

Claims (14)

Build a submerged dike to prevent outflow of construction material so as to surround the water area where the shallow area or / and the tidal flat should be constructed, and fill the inside of the submerged dike to form a middle layer, It is a creation method such as shallow place where a sand-covering layer with granulated blast furnace slag is provided on top ,
The submerged dike is constructed of steel slag, and the upper part of the submerged dike is 5 mass% or more with a particle size of more than 80 mm, 10 mass% or more with a particle size of more than 50 mm, and a particle size with a ratio of more than 30 mm of 45 mass% or more. Constructed by steelmaking slag having distribution, the lower part of the submerged dike is 85 mass% or more with a particle size of 30 mm or less, 10 mass% or more with a particle size of 10 mm or less, 3 mass% or more with a particle size of 5 mm or less, and 1 mm particle size A construction method for shallow fields or the like, characterized by comprising steelmaking slag having a particle size distribution of 1 mass% or more in the following ratio . Build a submerged dike to prevent outflow of construction material so as to surround the water area where the shallow area or / and the tidal flat should be constructed, and fill the inside of the submerged dike to form a middle layer, It is a creation method such as shallow place where a sand-covering layer consisting of an upper layer with blast furnace granulated slag and a lower layer with steelmaking slag is provided on top ,
The submerged dike is constructed of steel slag, and the upper part of the submerged dike is 5 mass% or more with a particle size of more than 80 mm, 10 mass% or more with a particle size of more than 50 mm, and a particle size with a ratio of more than 30 mm of 45 mass% or more. Constructed by steelmaking slag having distribution, the lower part of the submerged dike is 85 mass% or more with a particle size of 30 mm or less, 10 mass% or more with a particle size of 10 mm or less, 3 mass% or more with a particle size of 5 mm or less, and 1 mm particle size A construction method for shallow fields or the like, characterized by comprising steelmaking slag having a particle size distribution of 1 mass% or more in the following ratio . A submerged dike is constructed to prevent the outflow of construction material so as to surround the water area where the shallow area and / or tidal flat should be constructed, and dredged soil and blast furnace granulated slag are sequentially placed inside the submerged dike, so that multiple layers of dredged soil And a blast furnace granulated slag layer that is interposed between each of the clay layers and whose layer thickness is thinner than the layer thickness of the clay layer. It is a construction method such as a shallow place where a sand covering layer is provided ,
The submerged dike is constructed of steel slag, and the upper part of the submerged dike is 5 mass% or more with a particle size of more than 80 mm, 10 mass% or more with a particle size of more than 50 mm, and a particle size with a ratio of more than 30 mm of 45 mass% or more. Constructed by steelmaking slag having distribution, the lower part of the submerged dike is 85 mass% or more with a particle size of 30 mm or less, 10 mass% or more with a particle size of 10 mm or less, 3 mass% or more with a particle size of 5 mm or less, and 1 mm particle size A construction method for shallow fields or the like, characterized by comprising steelmaking slag having a particle size distribution of 1 mass% or more in the following ratio . A submerged dike is constructed to prevent the outflow of construction material so as to surround the water area where the shallow area and / or tidal flat should be constructed, and dredged soil and blast furnace granulated slag are sequentially placed inside the submerged dike, so that multiple layers of dredged soil And a blast furnace granulated slag layer that is interposed between each of the clay layers and whose layer thickness is thinner than the layer thickness of the clay layer. It is a construction method such as a shallow place where a sand-covering layer consisting of an upper layer and a lower layer made of steel slag is provided ,
The submerged dike is constructed of steel slag, and the upper part of the submerged dike is 5 mass% or more with a particle size of more than 80 mm, 10 mass% or more with a particle size of more than 50 mm, and a particle size with a ratio of more than 30 mm of 45 mass% or more. Constructed by steelmaking slag having distribution, the lower part of the submerged dike is 85 mass% or more with a particle size of 30 mm or less, 10 mass% or more with a particle size of 10 mm or less, 3 mass% or more with a particle size of 5 mm or less, and 1 mm particle size A construction method for shallow fields or the like, characterized by comprising steelmaking slag having a particle size distribution of 1 mass% or more in the following ratio . The method for creating a shallow place or the like according to claim 2 or 4, wherein the steelmaking slag constituting the lower layer of the sand covering layer has a particle size of 10 to 80 mm.   The method for creating a shallow place or the like according to any one of claims 1 to 5, wherein a seaweed settlement base or / and a fishing reef are installed on the sand covering layer.   The seaweed settlement base and / or fishing reefs are massive slag generated in the steel production process, carbonated solid blocks made mainly from slag produced in the steel production process, and water mainly made from slag produced in the steel production process. The method for creating a shallow place or the like according to claim 6, wherein the method is one or more selected from a Japanese cured body block. An artificially constructed shallow beach, tidal flat, or a beach with continuous shallow and flat tidal flats,
A submerged dike for preventing outflow of construction material constructed so as to surround the shallow water and / or tidal flats, a filling layer formed of dredged soil inside the submerged dike, and provided on the filling layer And a sand-covered layer of granulated blast furnace slag ,
The submerged levee is made of steel slag, and the upper part of the submerged levee is a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. The lower part of the submerged dike is 85 mass% or more, the ratio of 10 mm or less is 10 mass%, the ratio of 5 mm or less is 3 mass%, and the particle diameter is 1 mm or less. A formed structure comprising a steelmaking slag having a particle size distribution of 1 mass% or more . An artificially constructed shallow beach, tidal flat, or a beach with continuous shallow and flat tidal flats,
A submerged dike for preventing outflow of construction material constructed so as to surround the shallow water and / or tidal flats, a filling layer formed of dredged soil inside the submerged dike, and provided on the filling layer A sand-covering layer consisting of an upper layer made of granulated blast furnace slag and a lower layer made of steelmaking slag ,
The submerged levee is made of steel slag, and the upper part of the submerged levee is a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. The lower part of the submerged dike is 85 mass% or more, the ratio of 10 mm or less is 10 mass%, the ratio of 5 mm or less is 3 mass%, and the particle diameter is 1 mm or less. A formed structure comprising a steelmaking slag having a particle size distribution of 1 mass% or more . An artificially constructed shallow beach, tidal flat, or a beach with continuous shallow and flat tidal flats,
A submerged dike for preventing outflow of construction material constructed so as to surround the shallow water and / or tidal flats, and a filling layer formed by dredged soil and blast furnace granulated slag inside the submerged dike. A filling layer comprising a clay layer of layers and a blast furnace granulated slag layer interposed between the clay layers and having a layer thickness smaller than the thickness of the clay layer, and a blast furnace provided on the filling layer It has a sand covering layer with granulated slag ,
The submerged levee is made of steel slag, and the upper part of the submerged levee is a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. The lower part of the submerged dike is 85 mass% or more, the ratio of 10 mm or less is 10 mass%, the ratio of 5 mm or less is 3 mass%, and the particle diameter is 1 mm or less. A formed structure comprising a steelmaking slag having a particle size distribution of 1 mass% or more . An artificially constructed shallow beach, tidal flat, or a beach with continuous shallow and flat tidal flats,
A submerged dike for preventing outflow of construction material constructed so as to surround the shallow water and / or tidal flats, and a filling layer formed by dredged soil and blast furnace granulated slag inside the submerged dike. A filling layer comprising a clay layer of layers and a blast furnace granulated slag layer interposed between the clay layers and having a layer thickness smaller than the thickness of the clay layer, and a blast furnace provided on the filling layer It has a sand covering layer consisting of an upper layer made of granulated slag and a lower layer made of steelmaking slag ,
The submerged levee is made of steel slag, and the upper part of the submerged levee is a particle size distribution in which the ratio of the particle diameter of more than 80 mm is 5 mass% or more, the ratio of the particle diameter of more than 50 mm is 10 mass% or more, and the ratio of the particle diameter of more than 30 mm is 45 mass% or more. The lower part of the submerged dike is 85 mass% or more, the ratio of 10 mm or less is 10 mass%, the ratio of 5 mm or less is 3 mass%, and the particle diameter is 1 mm or less. A formed structure comprising a steelmaking slag having a particle size distribution of 1 mass% or more . The formed structure according to claim 9 or 11, wherein the steelmaking slag constituting the lower layer of the sand covering layer has a particle size of 10 to 80 mm.   The constructed structure according to any one of claims 8 to 12, wherein a seaweed settlement base or / and a fishing reef are installed on the sand-capping layer.   The seaweed settlement base and / or fishing reefs are massive slag generated in the steel production process, carbonated solid blocks made mainly from slag produced in the steel production process, and water mainly made from slag produced in the steel production process. The structured structure according to claim 13, wherein the structure is one or more selected from a Japanese cured body block.

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