JP3539614B2 - Method of forming plant growth base - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for forming a plant growth base on a ground surface, such as a slope, using a material including soil containing cohesive soil and crushed pieces of grass or wood.
[0002]
[Prior art]
Forming a plant growth base for greening on a ground surface such as a slope in a terrain remodeled area formed by cutting up mountainous or forested areas for the construction of roads and dams, the development of residential and golf courses, etc. Has been done.
[0003]
The formation of the plant growth substrate is carried out by passing a mixture of soil, the material of which is formed, and crushed pieces of herbs or woody plants which act as reinforcing materials for the soil and later ripen and act as amendments, through tubes. It is conceivable to carry out the method by conveying the air to the surface and spraying it on the slope.
[0004]
By the way, in order to harmonize with the surrounding vegetation, the material forming the plant growth base formed in the topographically modified land may include topsoil and weathered soil, that is, excavated soil generated during the topographical modification, that is, locally generated soil. desirable.
[0005]
However, locally generated soil generally consists of soil containing a large amount (usually 70% or more) of fine soil particle components (cohesive soil components) having a particle size of 74 μm or less. During transport, the fine particles adhere to the inner peripheral surface of the tube, and the lumen of the tube is closed in a short time. For this reason, the amount of soil that can be conveyed at one time is small, and a great deal of time and labor is required to release the blockage of the pipe. There was a problem of low.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to improve the efficiency of the formation of a plant growth base by carrying air by transporting soil containing cohesive soil, particularly soil that is locally generated in the formation area of the plant growth base, and one containing crushed pieces of grass or wood. It is to plan.
[0007]
[Means for Solving the Problems]
The present invention is a method for forming a plant growth base on the ground using a material including clay containing clay and crushed pieces of grass or wood, wherein the soil, the aggregating agent, and the crushing After the mixture obtained by mixing the pieces with the pieces is obtained, the mixture is pneumatically conveyed onto the ground by a pipe and sprayed onto the ground. The mixture can be obtained by mixing the soil and the crushed pieces and then mixing the aggregate with the crushed pieces. The soil is, for example, a locally generated soil at a site where the plant growth base is formed.
[0008]
[Action and effect]
According to the present invention, fine soil particles constituting the cohesive soil by adding a flocculating agent to soil containing cohesive soil, such as locally generated soil obtained at the formation site of the plant growth base, and mixing with the soil May be agglomerated, for example, a large number of soil particles as large as sand particles. Soil containing agglomerated soil particles has a substantially lower amount of said fine soil particles than soil without any agglomeration. In addition, for the agglomeration, after mixing the soil and the crushed pieces, and then mixing the agglomerated agent with them, these three components (soil, crushed pieces and agglomerated agent) are mixed. Better mixing and shorter mixing time than when mixing at once. This is preferred to prevent the agglomerated soil particles from collapsing during prolonged mixing.
[0009]
Therefore, the time from the start of air conveyance to the blockage of the pipe by the fine soil particles is made longer or infinite (that is, the blockage of the pipe does not occur) as compared with the conventional case. Thus, a large amount of soil can be conveyed at one time, and the labor and time for releasing the blockage can be reduced or eliminated. During this time, a large amount of the crushed vegetation pieces can be transported together with the soil.
[0010]
Therefore, in general, it is possible to convey the locally generated soil having a high content of the cohesive soil by air, and to form a plant growth base using the soil including the cohesive soil or the soil including the locally generated soil and the crushed pieces as a soil material. Can be performed easily and efficiently. The aggregated soil particles are more likely to adhere to the crushed pieces than non-agglomerated soil particles. Therefore, the soil and the crushed pieces can be released from the pipe while maintaining their integrity well, and the crushed pieces that maintain good integrity with the soil can be formed by the plant growth It provides a good reinforcing effect of the soil in the base. This provides a plant growth base that is resistant to erosion by rain and the like. In addition, due to the good integration, the amount of rebound at the time of release can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, first, a granulating agent is added to soil, which is a part of a material for forming a plant growth base formed on a ground surface such as a slope or a flat surface, that is, soil including a viscous soil. In addition, at least one of crushed pieces of herbs and crushed pieces of wood is added and then mixed to obtain a mixture. Thereafter, the mixture is pneumatically conveyed over the ground by a tube such as a hose, and the mixture is sprayed onto the ground surface from the end of the tube, thereby forming a plant growth base.
[0012]
The soil is typically a topsoil or a weathered soil under the topsoil, or a topsoil and a weathered soil generated by excavating the ground for terrain modification such as construction of roads and dams, development of residential lands and golf courses, and the like. , That is, a locally generated soil. The plant growth base is sown with seeds of plants such as turf, flowers, wildflowers, and trees, or transplanted with greenery plants, for greening the ground surface of the topographically modified land. If necessary, the seeds of the plant can be previously mixed with the soil, and the seeding can be completed together with the spraying of the mixture.
[0013]
When the soil and the aggregating agent (for example, a water-soluble polymer such as polyacrylamide) are mixed, fine particles constituting a viscous soil, which is a component of the soil, are formed according to the amount of the aggregating agent added. Some or most of the natural soil particles (soil particles having a particle size of 74 μm or less) are aggregated (agglomerated) by the action of the aggregating agent, and a large number of soils having a sandy size or larger are obtained. Turns into a set of particles. Thereby, the amount or ratio of the fine soil particles in the soil can be substantially reduced.
[0014]
The air transport of the mixture of the soil containing the aggregated soil particles and the crushed pieces is performed by supplying compressed air from an air compressor connected to the pipe to the pipe and using the compressed air as a transport medium. .
[0015]
Unlike the fine soil particles, the sand particles that have changed into a sand form smoothly move through the pipe without adhering to the inner peripheral surface of the pipe under the pressure of air in the pipe. Therefore, the soil containing the aggregated sand-like soil particles hardly causes or does not cause the blockage of the lumen of the pipe. The same applies to the air conveyance of locally generated soil, which generally has a high content of cohesive soil.
[0016]
Therefore, the time from the start of the air conveyance of the mixture of the soil and the crushed pieces to the blockage of the lumen of the pipe can be made long or infinite. For this reason, compared with the related art, it is possible to convey a larger amount of the mixture at one time, and to reduce the labor and time required for removing fine soil particles that are clogs when the pipe is clogged, Alternatively, it can be unnecessary. As a result, it is possible to easily and efficiently form a plant growth base using the soil containing the clayey soil or the mixture containing the locally generated soil as a soil material.
[0017]
The amount of the aggregating agent can be arbitrarily determined, but is preferably 0.2% or more based on the weight of the soil.
[0018]
Experiments have shown that under about 0.2% by weight of the agglomerated agent, about half of the amount of the cohesive soil was agglomerated, and the use of this soil did not result in lumen blockage of the tube.
[0019]
Increasing the amount of the aggregating agent increases the agglomeration rate of the fine soil particles (the ratio of the amount of the sandy particles to the total amount of the viscous soil). Almost 100% with a relatively small amount of aggregate. The amount of the agglomerated agent required to obtain the agglomeration rate of almost 100% is about 1.0% by weight or more when the soil belongs to the cohesive soil according to the classification. If so, it was about 0.3% by weight.
[0020]
The agglomerates of the soil particles further have a higher weight due to higher order agglomeration in which a plurality of the agglomerates are successively agglomerated via the linear polymer of the aggregating agent. Since the small aggregates are also intermingled with each other, the plant growth base formed by the mixture containing the soil containing the aggregates retains air and moisture, and has a root for growing the plant. It has a suitable void and provides a soil structure suitable for vegetation.
[0021]
The crushed pieces mixed with the soil containing the agglomerated soil particles preferably have a size of a toothpick or split chopsticks. Further, the mixing ratio of the crushed pieces to the soil can be set arbitrarily. For example, the weight is 20% (20% by weight) based on the weight of the soil. The vegetation, which is the raw material of the crushed pieces, preferably consists of those that have been cut or cut off during the terrain remodeling.
[0022]
The aggregated soil particles have better adhesion to the crushed pieces than non-agglomerated soil particles. For this reason, the degree of integrity between the soil and the crushed pieces mixed with the soil is high, and the separation of the two after discharge from the pipe is small. For this reason, these favorable integral relationships are maintained also in the plant growth base, and the crushed pieces function as a good reinforcing material for the soil. In addition, the crushed pieces form appropriate voids for growing the seeds and the transplanted plant in the plant growth base, and further ripen over time to become a fertilizer (soil improving material) for plant growth. .
[0023]
The crushed pieces of the herb (for example, weeds) or the crushed pieces of the wood (for example, tree trunks, branches, or roots) can be obtained by crushing with a crushing device, for example, a tab grinder (manufactured by Vermiya, USA). it can.
[0024]
Since the tab grinder is crushed by tearing or stripping the trunk, branches, etc. of the tree in the direction in which the fibers extend, the crushed pieces obtained using the tab grinder have a relatively thin and elongated shape. Have. Since the thin and long crushed pieces are flexible, the crushed pieces are easily entangled with each other. The entanglement of the crushed pieces contributes to maintenance of the morphology of the plant growth base, and thus to enhancement of erosion resistance against rainfall and the like.
[0025]
It should be noted that a fertilizer, an adhesive, or the like as a soil improving material can be mixed with the mixture and conveyed simultaneously by air, and can be sprayed toward the ground.
[0026]
Mixing of the soil, the aggregating agent, and the crushed pieces, or mixing of these with the fertilizer, the adhesive, the seeds, etc. is performed by a suitable mixing device, for example, a so-called pagmill mixer having a pagmill stirring blade. Can be performed.
[0027]
As described above, the soil, the aggregating agent, and the crushed pieces can be mixed at the same time, but preferably, the soil and the crushed pieces are mixed (at this time, usually unnecessary However, when the soil is dry, add a little water.) Then, add the above-mentioned aggregating agent to them and mix with them. The last time the agglomerated agent is mixed is better stirred as a whole, and the aggregating time of the agglomerated agent that occurs when the mixing time is too long can be shortened because the aggregating time of the agglomerated agent can be shorter. It is possible to prevent the collapsed soil particles.
[0028]
The mixture can be conveyed and sprayed with a common spraying device, for example, a mortar concrete spraying machine having a length of 150 m and an inner diameter of 2.5 to 5.0 cm. The amount of air to be applied and the working pressure are, for example, 10 m ³ / min and 7 kg / cm ² .

Claims (3)

A method for forming a plant growth base on the ground using a material including clay containing cohesive soil and crushed pieces of grass or wood, wherein the soil, the aggregating agent, and the crushed pieces are mixed. A method for forming a plant growth base, wherein the mixture is obtained by air, and then the mixture is pneumatically conveyed onto the ground by a tube and sprayed onto the ground. The method according to claim 1, wherein the mixture is obtained by mixing the soil and the crushed pieces and then mixing the aggregate with the soil. The method of claim 1, wherein the soil comprises locally generated soil at a site on which the plant growth base is formed.