JP4020502B2 - Soil improvement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soil improvement method in which soil needs to be improved in order to restore the tree vigor and improve the poor growth of long-term crops.
[0002]
[Prior art]
The decline in the tree vigor and the poor growth of perennial crops are caused by soil solidity, water permeability, soil structure such as superviscous or sandy, and humus content. That is, when the soil becomes dense, the supply of organic substances is small for a long period of time, the humus growth action for this is small, the drainage is poor, and the development of the soil structure is stagnant.
[0003]
As a method for restoring the tree vigor, it is highly preferable to replace the old soil that causes the decline of the tree vigor, such as soil consolidation, impermeability, soil structure, and humus content, with a new soil suitable for restoring the vigor. Needless to say.
[0004]
Conventionally, a soil improvement method for replacing old soil with new soil has been performed for the above-mentioned purpose. However, when the conventional method is described, as shown in FIGS. 5 and 6, the soil in the vicinity where the tree W is planted, That is, the root area of the tree (the area where the root Wa of the tree W exists) is excavated into a groove shape as shown in the figure with a power shovel, an earth auger or a trench digger (trencher), and the old soil S is removed. The new soil was replaced by inserting new soil T into the excavated trench.
[0005]
When the soil in the root zone of the tree is excavated using the excavating machine in this way, a part of the root Wa of the tree W is inevitably cut as shown in FIG. 6a, and the cutting of the root Wa is underground. In many cases, the stored nutrients are absorbed and deteriorated, and the cut a is an entry point for soil diseases, leading to the death of trees. That is, in the conventional method, the soil improvement work for restoring the tree vigor may sometimes result in shortening the life of the tree.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to propose a method for improving soil in the rhizosphere of a tree without cutting or damaging the root of the tree.
[0007]
[Means for Solving the Problems]
To achieve the above object, soil improvement method according to the invention of claim 1 is a method for improving the old soil S of Tree roots area range (there are roots Wa of trees W), improved In order to generate tree vigor by means of a pumping means 1 suitable for pumping highly viscous materials , such as concrete mortar , for example, pumping pump (FIG. 2), in the soil of the old soil S to be produced. A suitable new soil T is pumped and injected, and the old soil S is raised on the ground by the injection pressure of the new soil T, and the soil is improved by removing the raised old soil Sa (FIG. 2). The method is adopted.
[0008]
The soil improvement method according to claim 2 is a method for improving the old soil S of Tree roots area range (there are roots Wa of trees W), underground old soil S to be improved , the first compressed air pressure-feeding means 2, for example by utilizing cultivate working machine (Fig. 1), and press-fitted compressed air giving air explosion shock, to rise to gaps or cracks G in the ground of the old soil S Then, a new soil T suitable for generating a tree vigor is pumped and injected by a pumping means 1 suitable for pumping a material having high viscosity , such as concrete mortar , for example, a pump (FIG. 2). The old soil S is raised on the ground by the injection pressure of the new soil T, and the soil is improved by removing the raised old soil Sa (FIG. 2). is there.
[0009]
Further, the soil improvement method according to claim 3 is to improve the soil by mixing the old soil S to be removed with a material suitable for restoring the tree, for example, an organic material or an inorganic material , and the improved soil is used as a new soil. The method according to claim 1 or 2, wherein T is again pumped and injected into the ground.
[0010]
The soil improvement method according to claim 4 is configured such that the new soil T is pumped and injected into the ground by the pumping means 1 while being kneaded in a liquid containing water or nutrients. The method described in any one of 3 is adopted.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first step for carrying out the soil improvement method of the present invention. As shown in the figure, an operator M performs a soil exchanging work of a tree root zone range by using a well-known deep plowing machine 2. Compressed air is forcibly sent to an appropriate depth at a location, and a gap or crack G is generated in the ground by a kind of air explosion action. Specifically, the underground 45-45 is driven by a well-known deep plowing machine 2 integrally provided with a driving machine 4, a compressor 5, an air tank 6, and an engine 7 as a driving source for driving the compressed air jet nozzle 3. at the 60cm, distributed about I by press-fitting the compressed air once per 30~35L in pumping pressure of 9.5km / cm ^2, compressed air into the ground jet range over a range of diameters 130～320Cm ² Then, as shown in the figure, the surrounding soil is subjected to deep plowing work so that innumerable cracks G occur around the fumarole nozzle 3 and are crushed, and the density of the surrounding soil is reduced. In this way, the compressed air is only pressed into the ground by the deep plowing machine 2 and is not cultivated by the excavating blade. Even if the root of the tree extends into the deeply plowed portion, the root is cut or damaged. There is nothing.
[0012]
Next, as shown in FIG. 2, the operator M operates the soil pressure feeding means 1 to inject new soil T into the deeply plowed portion of the soil, and the old soil S is injected by the injection pressure of the new soil T. As shown in the figure Sa, it is intended to rise on the ground. Examples of the soil pressure-fitting means 1 include a pressure-feed pump suitable for pressure-feeding highly viscous materials such as concrete mortar. For example, a pumping tube type and a squeeze type pressure pump using a pumping roller, A snake-type pump using a snake rotor and a discharge pressure of 20 to 30 kg / cm ² can be used. This is a pump for compressing concrete mortar in the past, but the present inventor has repeatedly tested whether or not this pump can be used as a means for pumping and feeding soil. Since the distribution and specific gravity are different, it has been found that various soils can be pumped into the ground by changing the proportion of mixed water.
[0013]
The new soil T introduced into the hopper 8 of these pumps 1 is made of soil mixed with organic or inorganic materials suitable for the state of trees, and has a consistency suitable for pumping with the pump 1. In order to make it possible, the ratio of the soil and the liquid containing water or nutrients is 2 to 3: 1 in a mud-like state, and the pressure hose 9 is fed into the gap G (FIG. 1) at 45-60 cm in the deeply plowed ground. By injecting mud-like soil from the injection nozzle 11 at the tip of the hollow pipe 10 connected to, the soil pressure causes the old soil S on the ground surface side to rise as shown by Sa.
[0014]
Therefore, this raised old soil Sa is removed. As shown in FIG. 3, such work is performed at a plurality of locations in the rhizosphere range of the tree W, and the old soil Sa is raised at the plurality of locations, and the new soil T and the old soil S are replaced by removing these. However, according to this method, even if the root zone of the tree extends to the deeply plowed part, the root Wa is not cut and the old and new soils can be replaced smoothly.
[0015]
In this way, it is possible to replace old and new soil without cutting the roots, so there is no loss of stored nutrients in the roots, and trees can be protected from various soil diseases. 4 contains a large amount of moisture and air or nutrients as shown in Fig. 4, so that the roots extend significantly to the new soil part for a short period of time, for example, about 6 months, and the tree vigor is significantly restored. It has been found to be.
[0016]
The old soil Sa raised on the ground surface is removed, but the old soil Sa generated in large quantities requires a lot of labor for its removal place and removal work, so this old soil Sa is removed to another place. It can also be reused as new soil. That is, a large amount of old soil Sa is mixed with inorganic materials such as zeolite and perlite, organic materials such as cow dung compost (ripe cow dung compost), chicken dung compost, pig dung compost, bark compost (complete ripe bark compost), Sludge compost, peat (peat moss, etc.), chemical fertilizer, etc. may be mixed to form new soil T, which may be pumped again into the ground by the pumping means 1 as described above. According to this method, a large amount of old soil can be re-embedded in the ground, so there is no need to prepare a troublesome removal place and labor for removal, and the cost of soil improvement can be reduced accordingly. Can be mentioned.
[0017]
According to the above-described embodiment, first, as a first step, the work of lowering the density of the soil by the formation of gaps and crushing into the ground due to the press-fitting of compressed air into the ground of the soil is performed, and then the first step As a second process, new soil is pumped and injected, but the old soil is a relatively soft soil such as a sand layer or a silt layer. When the soil easily rises on the ground surface, the first step is not required and the second step can be performed.
[0018]
【The invention's effect】
According to the soil improvement method according to the invention of claim 1, by means of a pumping means comprising a pumping pump suitable for pumping a material with high consistency such as concrete mortar into the soil of the old soil to be improved. , Pumping in new soil suitable for generating tree vigor, pumping up old soil to the ground with the injection pressure of this new soil, and replacing old and new soil by removing this raised old soil So, even if the root zone of the tree extends to the deeply plowed part, the roots are not cut and the old and new soils can be replaced smoothly, so there is no loss of stored nutrients for the roots, In addition, trees can be protected from various soil diseases, and the new soil part contains a large amount of moisture and air or nutrients. Roots extend of new soil portion can be made to significantly restore the vigor of trees in the course.
[0019]
Further, in claim 2, even if the soil density of the place where soil improvement is performed is high and it is difficult to press-fit new soil into the ground, the old soil is first removed in the first step. Cultivation at a certain depth in the ground reduces the tightness of the old soil, and then, as a second step, new soil is pumped into the ground by means of pumping. It can be pressed into high old soil, and can be pushed up to the ground surface by causing cracks in the old soil by the pressure of the new soil. The soil can be replaced easily.
[0020]
Further, in claim 3, since a large amount of old soil can be buried again in the ground, there is no need for preparation and removal of a troublesome removal place, and the cost of soil improvement is low. There is an advantage to be completed.
[0021]
Further, in the present invention, since the new soil is kneaded into a liquid containing water or nutrients, the new soil is pumped into the ground by the pumping means. Can be easily pumped and injected into the ground, and the new soil contains sufficient moisture and oxygen, which can greatly contribute to the recovery of the tree.
[Brief description of the drawings]
FIG. 1 is a view for explaining a first step of an embodiment of the present invention.
FIG. 2 is a diagram for explaining the second step.
FIG. 3 is a plan view of the same.
FIG. 4 is an enlarged explanatory view of the main part.
FIG. 5 is a plan view for explaining the prior art.
FIG. 6 is a perspective view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Soil pumping means, such as a pumping pump 2 Compressed air pressure feeding means, such as a deep-plowing work machine T New soil S Old soil G Clearances and cracks generated in the ground

Claims (4)

  A method for improving old soil in the rhizosphere range of trees (the range where tree roots exist), suitable for pumping highly viscous materials into the soil of old soil to be improved Improve the soil by pumping in new soil suitable for generating tree vigor by the pumping means, and then pumping up the old soil to the ground by removing pressure from this new soil. The soil improvement method which was made to do.   This is a method for improving old soil in the root zone of trees (the range where tree roots exist). First, compressed air is injected into the ground of the old soil to be improved using compressed air pressure feeding means. However, the impact of an air explosion causes gaps and cracks in the soil of the old soil, and then the tree structure is caused by a pumping means suitable for pumping highly viscous materials. A soil improvement method in which suitable new soil is pumped and injected, the old soil is raised to the ground by the injection pressure of the new soil, and the soil is improved by removing the raised old soil.   The soil according to claim 1 or 2, wherein the old soil to be removed is mixed with materials suitable for recovery of tree vigor and the soil is improved, and the improved soil is pumped and injected again into the ground as new soil. Improvement method.   The soil improvement method according to any one of claims 1 to 3, wherein the new soil is pumped and injected into the ground by the pumping means in a state of being kneaded in a liquid containing water or nutrients.

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