JP2003079246A - Soil structure for planting and method for structuring the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil structure for planting maintaining both pH and water content suitable for plant growth. SOLUTION: This soil structure 1 for planting is such that, on acidic soil 2 spread in a marshland, a drainable neutralizing bed 8 made of concrete debris 3 is formed, and on the bed 8, soil 4 is dressed to form a planting bed 5 for growing a plant therein, wherein the block size of the concrete debris 3 and the thickness of the neutralizing bed 8 may be determined as appropriate so as to form gaps among the concrete debris 3 to secure sufficient drainage function and secure neutralizing effect owing to the alkaline component in the concrete debris 3 whereas desirable by in the early stages when the plant is not sufficiently grown yet, acidic water from the acidic soil 2 is neutralized in the drainable neutralizing bed 8 and then supplied to the planting bed 5 by the aid of capillarity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil structure for vegetation for maintaining a growth environment of plants in an acidic soil, particularly an acidic soil in a wetland, and a construction method thereof.

[0002]

2. Description of the Related Art In order for a plant to grow, a pH environment suitable for its growth is required. If the pH of the surface layer of the ground is too low or too high, the ground will be greened and agricultural crops will be produced. It becomes difficult to use.

Therefore, for example, it is difficult to turn agricultural land as it is without adding any acidic soil such as acidic sulfate soil. The acid sulfate soil is a soil containing sulfide mainly composed of pyrite, which is exposed to the air to generate sulfuric acid and becomes strongly acidic.

[0004] In order to use such an acidic soil as a green space or an agricultural land, it is necessary to improve it so that the soil environment is suitable for growing plants. It was common to try to neutralize by mixing the neutralizing agent of.

[0005]

However, in the conventional method of mixing the neutralizing agent, it takes time until the acidic soil is neutralized by the neutralization reaction, while the cost is increased by using it in a large amount. There was a problem that the start of plant cultivation was delayed.

Further, in such a method, since the neutralizing agent is mixed and stirred only in the surface layer, when the acidification reaches the lower layer, the surface layer is acidified again by the acidic water rising from the lower layer to the surface layer. However, a large amount of precipitation causes the neutralizing agent to flow out and return to the original acidic soil, thus making it difficult to maintain a pH environment suitable for plant growth for a long period of time.

Particularly in wetlands, since the groundwater level is high, the influence of acidic water from the lower layer is great.

Further, in such a wetland, since the soil is moist, the trafficability of large heavy equipment is deteriorated, and it becomes difficult to mix the neutralizing agent. There is also a problem that plants that can grow because they are too expensive are limited.

The present invention has been made in view of the above circumstances, and provides a soil structure for vegetation capable of maintaining a pH environment and a water environment suitable for plant growth and a method for constructing the soil structure. To aim.

[0010]

In order to achieve the above object, the soil structure for vegetation according to the present invention, as described in claim 1, is a drainage neutralization method in which concrete slag is laid on acid soil. A layer is formed, and a predetermined soil is deposited on the drainage neutralization layer to form a vegetation layer for plants to grow.

Further, in the soil structure for vegetation according to the present invention, a predetermined drainage pipe is arranged in the drainage neutralization layer so as to communicate with a gap formed between the concrete husks, and the drainage pipe is provided. The drainage pump is connected to.

Further, the vegetation soil structure according to the present invention has a water-permeable protection between at least one of the acidic soil and the drainage neutralization layer and / or between the drainage neutralization layer and the vegetation layer. A sheet is interposed.

Further, the vegetation soil structure according to the present invention is such that the water-permeable protective sheet is interposed between the drainage neutralization layer and the vegetation layer, and the soil is dredged soil.

In the vegetation soil structure according to the present invention, the water-permeable protective sheet is interposed between the acidic soil and the drainage neutralization layer, and the acidic soil is spread over a wetland. It was done.

Further, the method for constructing a soil structure for vegetation according to the present invention, as described in claim 6, forms a drainage neutralization layer comprising laying concrete glass on acid soil, The vegetation layer for growing plants is formed by applying a predetermined soil on the neutralization layer.

Further, in the method for constructing a soil structure for vegetation according to the present invention, at least one of between the acidic soil and the drainage neutralization layer and between the drainage neutralization layer and the vegetation layer. A water-permeable protective sheet is interposed.

In the soil structure for vegetation and the method for constructing the same according to the present invention, first, a drainage neutralization layer is formed by laying concrete dust on acidic soil, and then the drainage neutralization layer is formed. A certain soil is applied to the top of the above to form a vegetation layer for plants to grow.

In this way, the acidic water that has infiltrated the drainage neutralization layer from the acidic soil side is neutralized by the concrete glass containing the alkaline component and passes through the gaps formed between the concrete glass. The water is drained in the in-plane direction within the cross section of the drainage neutralization layer.

Therefore, even if acidic water is leached from the acidic soil due to rainfall or the like, the acidic water does not directly enter the vegetation layer but first enters the drainage neutralization layer.

Since the acidic water that has entered the drainage neutralization layer is neutralized by the neutralizing action of the drainage neutralization layer, even if it subsequently enters the vegetation layer, the acidic environment in the vegetation layer will be affected. Does not have any adverse effect.

Further, even if the acidic water that has infiltrated into the drainage neutralization layer from the acidic soil cannot be completely neutralized and remains weakly acidic, for example, the acidic water is not cross-linked by the drainage action of the drainage neutralization layer. The water will be drained in the in-plane direction and will not enter the vegetation layer. Therefore, there is no adverse effect on the growth of plants in the vegetation layer.

On the other hand, even if a large amount of water flows into the vegetation layer due to rainfall or the like, the surplus water infiltrates into the drainage neutralization layer thereunder, and the drainage action of the drainage neutralization layer causes the cross-section in the cross section. The water is drained in the in-plane direction. Therefore, it is possible to suppress an increase in the water content of the vegetation layer.

Here, in order to allow the water having entered the drainage neutralization layer to flow in a predetermined direction in the cross section by utilizing its drainage function, for example, when the acidic soil is formed in a stepwise manner. For example, the natural flow from upstream to downstream can be used.

Further, since the concrete glass constituting the drainage neutralization layer gradually shifts to weak alkali and neutral while neutralizing the acidic water, the cement component contained in the concrete glass is decomposed. , The concrete debris and the entire drainage neutralization layer are decomposed over time.

That is, since the cement contained in the concrete debris is mainly composed of silicic acid, alumina, lime salt of iron oxide and a small amount of alkali compound, it becomes soluble lime salt by acid and thus has a predetermined decomposition function. Become. In particular, strong inorganic acids such as sulfuric acid, hydrochloric acid, and nitric acid neutralize calcium hydroxide in cement and decompose into relatively stable hardening products such as lime silicate and alumina salt. Further, salts such as sodium, magnesium and calcium sulfates react with calcium hydroxide in the cement to form a soluble substance, or take a large amount of crystal water to expand and decompose the cement.

Therefore, the plant growing in the vegetation layer penetrates the decomposed drainage neutralization layer, extends the roots in the soil thereunder, and continues to grow smoothly. In addition, the soil that was acidic at the beginning when the drainage neutralization layer was formed migrated to a non-acidic environment by the neutralizing action described above, and in this respect also, the plants in the vegetation layer had an appropriate pH. Can be grown in the environment.

The concrete debris and the drainage neutralizing layer formed by laying the debris should ensure that a space is formed between the concrete debris and a sufficient drainage function is ensured and that the above-mentioned neutralizing action is ensured. The particle size of concrete debris and the thickness of the drainage neutralization layer are appropriately determined.

The vegetation layer is a layer for growing plants, and what kind of plants are grown is arbitrary. For example, it is conceivable to plant cereals such as vegetables and rice in a vegetation layer to make farmland, or to plant grass to make green space in a park.

As a means for causing the water having entered the drainage neutralization layer to flow in a predetermined direction in the cross section by utilizing its drainage function, the natural flow from upstream to downstream is used as described above. Although it does not matter, when a predetermined drainage pipe is arranged in the drainage neutralization layer so as to communicate with the gap formed between the concrete debris and a drainage pump is connected to the drainage pipe, Since an artificial flow can be created using a drainage pipe and drainage pump, the drainage function of the drainage neutralization layer can be made effective, and the amount of drainage from the drainage pump is reduced to the drainage neutralization layer. By controlling the drainage pump so that it always exceeds the inflow, it is possible to properly manage the water environment of the vegetation layer.

In forming the drainage neutralization layer, the drainage neutralization layer may be directly laminated on the acidic soil, but a water-permeable protective sheet is interposed between the drainage neutralization layer and the acidic soil. That is, if the water-permeable protective sheet is laid on the acidic soil and then the drainage neutralization layer is formed, the water-permeable protective sheet moves the soil particles from the acidic soil toward the drainage neutralization layer. Since it is blocked, it is possible to prevent soil particles of acidic soil from entering the gaps between concrete husks and causing clogging as the groundwater level rises. It is possible to secure the drainage function of.

Similarly, when the vegetation layer is formed, it may be laminated directly on the drainage neutralization layer, but a water-permeable protective sheet is interposed between the drainage neutralization layer and the vegetation layer. That is, if the water-permeable protective sheet is laid on the drainage neutralizing layer and then the vegetation layer is formed, the water-permeable protective sheet is used to remove soil particles from the vegetation layer toward the drainage neutralizing layer. Since movement is blocked, it is possible to prevent soil particles in the vegetation layer from entering the gaps between concrete husks and causing clogging due to the weight of the soil and the flow of water during rainfall, thus draining water. It is possible to secure the original drainage function of the neutralization layer.

The water-permeable protective sheet may be constructed in any manner as long as it can pass through the roots without allowing soil particles to pass through and not inhibiting the growth of plants. For example, a nonwoven fabric is used. It is possible to do it.

Since the water-permeable protective sheet has water permeability, there is no fear that the inflow of water from the acidic soil or the vegetation layer to the drainage neutralization layer will be hindered.

Further, among the above water-permeable protective sheets, only one of them may be interposed, or both of them may be interposed.

Any soil may be used as the soil to be used as long as it is a high-quality soil on which plants can grow. However, the water-permeable material between the drainage neutralization layer and the vegetation layer may be used. If the soil is a dredged soil, the surplus water of the dredged soil with a high water content ratio is quickly drained by the drainage function of the drainage neutralization layer, and thus the moisture suitable for plant growth is provided. It becomes the vegetation layer of the environment.

Further, since the water-permeable protective sheet is laid on the drainage neutralization layer before the dredged soil is applied to the soil, even if the dredged soil is easy to flow, its soil particles are It is possible to prevent the movement due to the blocking action described above from entering the gaps between the concrete debris and causing clogging, thus ensuring the original drainage function of the drainage neutralization layer. Become.

Therefore, conventionally, it is difficult to use it for cultivated land and green areas due to its high water content, and the dredged soil, which had to be disposed of as industrial waste after being subjected to treatment such as dehydration and solidification, should be specially prepared in advance. It can be effectively used as a vegetation layer for plants to grow without treatment.

Since the dredged soil contains many components such as organic matter, nitrogen and phosphoric acid which are fertilizers for plants, a soil environment suitable for plant growth is constructed and the amount of chemical fertilizers used Can also be reduced.

It does not matter what kind of acidic soil the present invention is applied to, but when a water-permeable protective sheet is interposed between the acidic soil and the drainage neutralization layer, the acidic soil that spreads over wetlands Effectively applied to soil. That is, even in a wetland where the influence of acidic water rising from the lower layer to the surface layer is large due to the high groundwater level, the acidic water rising from the lower layer to the surface layer is neutralized and drained by the drainage neutralization layer. Therefore, for a long period of time, the vegetation layer should be suitable for plant growth.
It can be maintained in an H environment and a water environment.

Further, since the movement of the soil particles of the acidic soil is blocked by the above-mentioned blocking action of the water permeable protection sheet, the soil particles flow into the drainage neutralization layer as the groundwater level rises, causing clogging. This makes it possible to ensure the original drainage function of the drainage neutralization layer.

Further, in the past, workability was poor due to the fact that a foot was taken in a wetland, but it was necessary to lay a water-permeable protective sheet on acidic soil and then form a drainage neutralization layer. As a result, workability in wetlands is greatly improved.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a soil structure for vegetation and a construction method thereof according to the present invention will be described below with reference to the accompanying drawings. It should be noted that parts and the like which are substantially the same as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a sectional view showing a soil structure for vegetation according to this embodiment. As can be seen in the figure, the soil structure 1 for vegetation according to this embodiment has a drainage neutralization layer 8 made of concrete slag 3 formed on an acidic soil 2 spreading in a wetland, and the drainage neutralization layer 8 is formed. A soil layer 4 is formed on the top of the above to form a vegetation layer 5 for growing plants.

The concrete debris 3 and the drainage neutralizing layer 8 composed of the concrete debris are
By appropriately determining the particle size of the concrete debris 3 and the thickness of the drainage neutralizing layer 8 so that a gap is formed between them and a sufficient drainage function is secured, and a neutralizing action by the alkaline component is secured. Good. On the other hand, in the initial stage where the plant is not growing sufficiently, it is preferable that the acidic water from the acidic soil 2 is neutralized by the drainage neutralization layer 8 and then supplied to the vegetation layer 5 by the capillary phenomenon.

Therefore, for example, it is conceivable to adjust the particle size of the concrete debris 3 to a particle size of 2 mm or more and 20 mm or less and set the thickness of the drainage neutralizing layer 8 to several cm.

The vegetation layer 5 is a layer for growing plants, and is used, for example, by planting trees, vegetables or cereals in the vegetation layer to make it a farmland or turf to make a green space in a park. It will be.

Here, the water-permeable protective sheet 6 is interposed between the acidic soil 2 and the drainage neutralization layer 8 so that the soil particles of the acidic soil 2 enter the drainage neutralization layer 8. It is designed to prevent Similarly, drainage neutralization layer 8 and vegetation layer 5
A water-permeable protective sheet 7 is interposed between the above and so as to prevent the soil particles of the soil 4 forming the vegetation layer 5 from entering the drainage neutralization layer 8.

The water-permeable protective sheet 6 and the water-permeable protective sheet 7 are each made of a non-woven fabric so that soil particles cannot pass through and plant roots can pass through.

FIG. 2 is a horizontal sectional view and a detailed view of the drainage neutralization layer 8. As can be seen from the figure, a hollow cylindrical drainage pipe 21 provided with a large number of water passage holes 20 so as to communicate with the gaps formed between the concrete debris 3 is provided in the drainage neutralization layer 8. The drain pipe is buried and is connected to the drain pump 22 via the header 23 so that the water flowing into the drainage neutralization layer 8 can be drained by using the drain pipe 21 and the drain pump 22. Has become.

In order to construct the soil structure 1 for vegetation according to this embodiment, first, the water-permeable protective sheet 6 is laid on the acidic soil 2 spreading in the wetlands.

Next, the concrete debris 3 is spread on the water-permeable protective sheet 6 to have an appropriate thickness to form a drainage neutralizing layer 8. At this time, the drain pipe 21 described above is embedded in the drainage neutralization layer 8.

Next, the water-permeable protective sheet 7 is laid on the drainage neutralization layer 8, and then the soil 4 is deposited on the water-permeable protective sheet 8 to grow plants. To form.

In the soil structure 1 for vegetation according to the present embodiment, as shown in FIG. 3, the acidic water that has infiltrated into the drainage neutralization layer 8 from the acidic soil 2 side is the concrete slag 3 containing alkaline components. As is well understood in FIG. 2 (b), while being neutralized by the water, it flows into the drain pipe 21 from the water passage hole 20 through the gap formed between the concrete glasses 3 and is pulled out by the drain pump 22. Drained from the drainage neutralization layer 8.

Therefore, even if acidic water is leached from the acidic soil 2 due to rainfall or the like, the acidic water is still sown in the vegetation layer 5.
To the drainage neutralization layer 8 first.

Since the acidic water that has entered the drainage neutralization layer 8 is neutralized by the neutralizing action of the drainage neutralization layer, even if it subsequently enters the vegetation layer 5 (the direction of the broken line in FIG. 3). ), And does not have any bad influence on the pH environment in the vegetation layer 5. Rather, the neutralized water is supplied to the vegetation layer 5 by capillarity.

Further, even if the acidic water that has infiltrated into the drainage neutralization layer 8 from the acidic soil 2 cannot be completely neutralized and stays weakly acidic, for example, the acidic water will still be discharged from the drainage neutralization layer 8 and the drain pipe. 21 and the drainage pump 22 cause drainage in the in-plane direction (flow direction by the drainage pump 22) in the cross section of the drainage neutralization layer 8 (solid line direction in FIG. 3), and do not enter the vegetation layer 5. . Therefore, there is no adverse effect on the growth of plants in the vegetation layer 5.

On the other hand, even if a large amount of water flows into the vegetation layer 5 due to rainfall or the like, the surplus water enters the drainage neutralization layer 8 thereunder, and the drainage effect is the same as that described above. It is drained in the in-plane direction within the cross section of the neutralization layer 8. Therefore, it is possible to prevent the water content of the vegetation layer 5 from increasing.

Here, when the water that has entered the drainage neutralization layer 8 is caused to flow in a predetermined direction within the cross section by utilizing its drainage function, as described above, the drainage pipe 21 and the drainage pump 22.
However, if the drainage pump 22 is driven and controlled so that the amount of drainage from the drainage pump 22 always exceeds the amount of inflow to the drainage neutralization layer 8, the vegetation layer 5 of It is possible to properly manage the water environment.

Further, the concrete debris 3 constituting the drainage neutralization layer 8 gradually shifts to weak alkali and neutral while neutralizing acidic water, and the cement component contained in the concrete debris is decomposed. Therefore, the concrete debris 3 and thus the drainage neutralization layer 8 as a whole are decomposed over time, and aggregates such as sand and gravel contained in the concrete debris 3 remain.

Therefore, the drainage neutralization layer 8 can maintain its drainage function for a long time even after being decomposed, and the tree 31 growing in the vegetation layer 5 has the decomposed drainage neutralization layer 8 as shown in FIG. The roots are extended through the Japanese layer 8 to the soil 2a thereunder, and the growth is continued smoothly. In addition, drainage neutralization layer 8
The soil 2 that was acidic at the beginning of the formation was transferred to a non-acidic environment by the neutralizing action described above. In this respect also, it is necessary to grow the plant in the vegetation layer 5 in an appropriate pH environment. You can

Silica is eluted during the process of neutralizing the cement component, and the silica becomes a fertilizer for rice cultivation,
Strengthens the tissue of grasses.

As described above, according to the vegetation soil structure 1 and the construction method thereof according to the present embodiment, the acidic soil 2 is used.
The acidic water that has entered from the side can be neutralized by the drainage neutralization layer 8 made of the concrete glass 3, and the acidic water can be drained in the in-plane direction within the cross section of the drainage neutralization layer 8.

Therefore, even if the acidic water is leached from the acidic soil 2 due to rainfall or rise of groundwater, the acidic water is neutralized by the neutralizing action of the drainage neutralization layer 8 and the acidic water is neutralized. Even if the acidic water is not weakened and remains weakly acidic, it becomes possible to drain the acidic water in the in-plane direction in the cross section by the drainage action of the drainage neutralization layer 8 and block the vegetation layer 5 from the acidic soil 2. In other words, it is possible to prevent acidic water from entering the vegetation layer 5 in advance.

On the other hand, even if a large amount of water flows into the vegetation layer 5 due to rainfall or the like, the surplus water enters the drainage neutralization layer 8 therebelow, and is discharged by the drainage neutralization layer. Drained in-plane in the cross section. Therefore, it is possible to prevent the water content of the vegetation layer 5 from increasing.

Further, in the process in which the concrete glass 3 gradually shifts to the neutral environment while neutralizing the acid water as described above, the acid water decomposes the cement component contained in the concrete glass 3, Aggregates such as gravel and sand remain in the long run.

Therefore, the tree 31 growing in the vegetation layer 5
Penetrates such gravel or sand and extends its roots into the soil 2a that has become a neutral environment.

Therefore, it becomes possible to maintain the vegetation layer 5 in an appropriate pH environment and a water environment, and to grow the roots of the trees 31 to be grown in the vegetation layer 5 into the soil 2a, thus making it possible to grow smoothly. Even the soil 2 can be used as a green space or an agricultural land.

In the vegetation layer 5, the soil 4 is ready to grow immediately after the soil 4 has been soiled. Therefore, unlike the conventional method of mixing the neutralizing agent, the acidic soil 2 is waited for to be neutralized. It becomes possible to start cultivating the plant in the vegetation layer 5.

On the other hand, since the concrete waste 3 can be effectively used as a constituent material of such a drainage neutralization layer 8, it is possible to reduce the volume of industrial waste.

Further, the vegetation soil structure 1 according to this embodiment.
According to this, since the drainage pipe 21 is embedded in the drainage neutralization layer 8 so as to communicate with the gap between the concrete debris 3 and the drainage pump 22 is connected to the drainage pipe, the drainage pipe and the drainage pump are connected to each other. An artificial flow of water can be created by using the drainage neutralization layer 8 and the drainage function of the drainage neutralization layer 8 can be made effective. The water environment of the vegetation layer 5 can be appropriately managed by driving and controlling the drainage pump 22 so as to always exceed the inflow amount.

Further, the vegetation soil structure 1 according to the present embodiment.
And according to the construction method thereof, since the water-permeable protective sheet 6 is interposed between the acidic soil 2 and the drainage neutralization layer 8, the water-permeable protective sheet blocks the movement of soil particles to prevent the acidity. It is possible to prevent the soil particles of the soil 2 from entering the gaps between the concrete debris 3 and being clogged with the rise of the groundwater level, for example, so that the drainage neutralizing layer 8 has an original drainage function. It becomes possible to secure.

Further, the vegetation soil structure 1 according to the present embodiment.
And according to the construction method thereof, the drainage neutralization layer 8 and the vegetation layer 5
Since the water-permeable protective sheet 7 is interposed between the water-permeable protective sheet 7 and the soil, movement of soil particles is blocked by the water-permeable protective sheet 7. Therefore, it is possible to prevent the soil particles of the vegetation layer 5 from entering the gaps between the concrete lumps 3 by their own weight or with the flow of water at the time of rainfall to be clogged, and as described above. It is possible to secure the original drainage function of the drainage neutralization layer 8.

Further, the vegetation soil structure 1 according to the present embodiment.
According to the present invention, since the present invention was applied to the acidic soil 2 spreading in the wetlands, even in a wetland where the influence of acidic water rising from the lower layer to the surface layer due to the high groundwater level is large, The rising acidic water is neutralized and drained by the drainage neutralization layer 8, and the vegetation layer 5 can be maintained in a pH environment and a water environment suitable for plant growth for a long period of time.

Conventionally, the workability was poor because the foot was taken in a wetland, but the water-permeable protective sheet 6 was laid on the acidic soil 2, and then the drainage neutralization layer 8 was formed. Therefore, the workability in wetlands will be greatly improved.

In this embodiment, the drain pipe 21 is embedded in the drainage neutralization layer 8. However, if the drainage function of the drainage neutralization layer 8 can be realized, the drain pipe 21 Two
The arrangement of 1 is arbitrary, and for example, it may be arranged so as to surround the drainage neutralization layer 8.

Further, in the present embodiment, the drainage pipe 21 is arranged so as to communicate with the gap between the concrete debris 3 and the drainage pump 22 is connected to the drainage pipe 21, so that the drainage neutralization layer 8 is penetrated. The generated water was made to flow in a predetermined direction within the cross section. For example, when the acidic soil 2 is formed in a stepwise manner, the natural flow from upstream to downstream is used to discharge the drainage pipe 21 and the drainage water. The pump 22 may be omitted.

In the present embodiment, the water-permeable protective sheet 6 and the water-permeable protective sheet 7 are provided between the acidic soil 2 and the drainage neutralization layer 8 and between the drainage neutralization layer 8 and the vegetation layer 5, respectively.
However, both the water-permeable protective sheet 6 and the water-permeable protective sheet 7 may be omitted if there is no concern that the gaps between the concrete pieces 3 will be clogged with soil particles. Only one of them may be interposed.

In the present embodiment, the acidic soil is the acidic soil 2 that spreads over wetlands. However, the present invention can be applied to any acidic soil, and the present invention can be applied to acidic soils other than wetlands. Needless to say, can be applied.

In the present embodiment, no particular reference was made to the type of soil 4, but as shown in FIG. 5, the dredged soil 41 is used as soil to form the vegetation layer 42, and the vegetation layer 42 The water-permeable protective sheet 7 may be interposed between the drainage neutralization layer 8 and the drainage neutralization layer 8.

In this way, due to the drainage function of the drainage neutralization layer 8, the surplus water of the dredged soil 41 having a high water content ratio is quickly drained, and the vegetation layer 42 has a water content suitable for plant growth. Become the environment.

Further, since the water-permeable protective sheet 7 is laid on the drainage neutralization layer 8 before the dredged soil 41 is soiled, even if the dredged soil 41 is easy to flow, its soil particles are permeable to water. It is possible to prevent the movement of the drainage neutralization layer 7 from being blocked due to the blocking action of the waterproofness protection sheet 7 and to cause clogging due to invasion into the gaps between the concrete debris 3, thus ensuring the original drainage function of the drainage neutralization layer 8. It becomes possible to do.

Therefore, conventionally, it is difficult to use it in cultivated land and green areas due to its high water content, and the dredged soil, which had to be disposed of as industrial waste after being subjected to treatment such as dehydration and solidification, was specially prepared in advance. It can be effectively used as a vegetation layer for plants to grow without treatment.

Utilizing its high fluidity, the dredged soil 41 can be soiled at a desired position by a pressure pump connected to a pipe similar to concrete pipe, for example.

Since the dredged soil 41 contains a lot of components such as organic matter, nitrogen and phosphoric acid, which are fertilizers for plants,
A soil environment suitable for plant growth will be constructed,
It is also possible to reduce the amount of chemical fertilizer used.

Further, although not particularly mentioned in the present embodiment, it is optional how much the drainage neutralization layer and the vegetation layer are spread in a plane, and it is not necessarily required to be continuous in a plane.

FIG. 6 is a cross-sectional view showing a soil structure for vegetation according to a modified example. In this modified example as well as in the above-described embodiment, drainage neutralization consisting of concrete soil 3 on acidic soil 2 is carried out. Although the layer 8 is formed and the vegetation layer 5 made of the soil 4 is formed on the drainage neutralization layer, the drainage neutralization layer 8 and the vegetation layer 5 form the ridges 51 as a whole. .

In such a structure, as in a normal field,
Crop is grown in the vegetation layer 5 of the ridge 51. In addition,
Also here, the thickness of the drainage neutralization layer 8, the grain size of the concrete debris 3 constituting the drainage neutralization layer, or the thickness of the vegetation layer 5 is arbitrary. For example, the thickness of the vegetation layer 5 is about 30 cm. It is possible to do it.

According to this modification, it is possible to save the amount of the concrete waste 3 constituting the drainage neutralization layer 8. In this modification, the drainage pipe 21 may be appropriately embedded in the drainage neutralization layer 8 forming each ridge 51, if necessary.

[0089]

As described above, according to the soil structure for vegetation and the method for constructing the same according to the present invention, the vegetation layer is appropriately p-typed.
It is possible to grow smoothly in roots of plants that grow in vegetation layers while maintaining the environment in H and water, and thus to use as a green space or agricultural land even in acidic soil. it can.

[0090]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a soil structure for vegetation according to this embodiment.

2 is a diagram showing a drainage neutralization layer 8 of a soil structure for vegetation according to the present embodiment, (a) is a horizontal sectional view taken along the line AA of FIG. 1, and (b) is a detailed view.

FIG. 3 is a diagram showing an operation of a soil structure for vegetation and a construction method thereof according to the present embodiment.

FIG. 4 is a view showing the operation of the soil structure for vegetation and the construction method thereof according to the present embodiment.

FIG. 5 is a cross-sectional view showing a soil structure for vegetation according to a modification.

FIG. 6 is a cross-sectional view showing a soil structure for vegetation according to another modification.

[Explanation of symbols]

1 Soil structure for vegetation 2 acidic soil 3 Concrete Gala 4 Saturday 5,42 Vegetation layer 8 Drainage neutralization layer 6, 7 Water permeable protective sheet 21 drainage pipe 22 Drainage pump 41 Dredged soil

Claims (7)

[Claims] 1. A vegetation for growing a plant by forming a drainage neutralization layer by laying concrete husks on acid soil, and depositing a predetermined soil on the drainage neutralization layer. A soil structure for vegetation characterized by forming layers. 2. A drainage pipe is arranged in the drainage neutralization layer so as to communicate with a gap formed between the concrete trash and a drainage pump is connected to the drainage pipe. Soil structure for vegetation. 3. The water-permeable protective sheet is interposed between at least one of the acidic soil and the drainage neutralization layer and between the drainage neutralization layer and the vegetation layer. Soil structure for vegetation. 4. The soil structure for vegetation according to claim 3, wherein the water-permeable protective sheet is interposed between the drainage neutralization layer and the vegetation layer, and the soil is dredged soil. 5. The vegetation soil structure according to claim 3, wherein the water-permeable protective sheet is interposed between the acidic soil and the drainage neutralization layer, and the acidic soil is an acidic soil that extends into a wetland. . 6. A vegetation for growing a plant by forming a drainage neutralization layer by laying concrete husks on acidic soil, and depositing a predetermined soil on the drainage neutralization layer. A method for constructing a soil structure for vegetation, which comprises forming a layer. 7. The vegetation according to claim 6, wherein a water-permeable protective sheet is interposed between at least one of the acidic soil and the drainage neutralization layer and between the drainage neutralization layer and the vegetation layer. Method of constructing soil structure for soil.