JP2004052327A - Method for preventing outflow of surface soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple method which can surely prevent an outflow of surface soil such as red clay etc. without devastating soil. <P>SOLUTION: An outflow preventing material is manufactured in such a manner that soil, which is formed in the purification of running water, industrial water and the like, is molded like a particle with a water content of the order of 1-2%. After that, the outflow preventing material is placed as fill and stacked in a place where water flows, or arranged in the state of being packed in a sandbag, so that a weir can be constructed so as to dam up the water. Thus, the downflow of the surface soil is prevented. Additionally, the outflow preventing material is manufactured as an appropriate-rate mixture which is composed of the soil formed in the purification of the running water, the industrial water and the like, soil produced from a used-paper recycling factory, coal ash produced from a thermal power plant, and recycled chips produced from an industrial-waste treatment plant. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a method for preventing the outflow of topsoil such as red soil flowing out of a construction site, agricultural land, landslides and the like.
[0002]
[Prior art]
Generally, when the hourly rainfall is about 30 mm, the surface of the soil is shaved by rain, the particles of the soil become finer, and the topsoil flows. Or, in places where the speed of water flow is high, such as slopes, particles of red soil flow out to the sea, so it was necessary to prevent red soil from flowing out.
[0003]
Conventionally, as a method of preventing runoff of topsoil such as red soil, there has been a method of covering a soil surface by sowing a bond or an emulsion on a bare soil surface generated during construction.
Other methods include covering the soil surface with a vinyl sheet during rainfall to prevent soil runoff, creating a sand basin to slow down the time required for water containing red soil generated during rainfall to reach the sea, or creating stones or stones. There was a method in which weirs were used to dam the topsoil with concrete or the like, damming the water containing the redsoil, and causing the particles of the redsoil to settle there.
[0004]
[Problems to be solved by the invention]
Among the conventional methods, the former method of covering the soil surface with an emulsion or the like is not preferable because the surface of the soil is roughened.
In addition, the method of covering with a vinyl sheet is troublesome and troublesome in a large area, and the method of making a weir is effective in preventing the outflow of red soil while a certain amount of water is flowing from the weir, but it exceeds a certain amount of rainfall In that case, red soil overflows along with rainwater from the weir and the effect of preventing topsoil runoff is lost.
The present invention has been made to solve such a problem of the conventional example.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the gist of the present invention is to prepare a runoff prevention material mainly containing soil containing a flocculant, and then deposit the runoff prevention material on a surface of the soil to a predetermined thickness. The purpose is to prevent runoff of topsoil.
Further, the gist of the present invention is to prepare an outflow prevention material mainly composed of soil containing a coagulant, and then embankment and laying the outflow prevention material in a place where water flows, or in a sandbag bag. The purpose of this is to prevent topsoil runoff by creating weirs and damping water by arranging them together.
In addition, the gist of the present invention is to form the above-mentioned outflow prevention material into granules having a water content of about 1% to 17% containing a soil containing a coagulant generated at the time of purifying tap water or industrial water. I have created it.
Further, the gist of the present invention is that the above-mentioned spill prevention material includes soil containing a flocculant generated during purification of tap water or industrial water, and soil containing a flocculant generated from a used paper recycling plant. In this method, coal ash generated from a thermal power plant, recycled chips from an industrial waste disposal plant, and the like are mixed at an appropriate ratio, and the mixture is formed into granules having a water content of about 1% to 17%.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described.
When tap water or industrial water is purified, soil containing a flocculant called sludge or cake is generated at the time of purification. In the present embodiment, this soil is used. In addition, other soils can also be used as long as they contain a flocculant. For example, soil comes out from a dam construction site, and a coagulant can be added to this soil for use.
[0007]
The flocculant is a known chemical agent, and acts to solidify the fine particles of the soil floating in the raw water in the process of purifying the water, floculate and settle the soil. Also called agent.
Since the soil of the present embodiment is solidified by this coagulant, it is stable even if it is formed into granules, and does not melt out into water and return to the original soil.
[0008]
According to the present embodiment, the soil generated from the water purification plant during purification of tap water, industrial water, or the like is adjusted to a moisture content of about 1% to 17%, preferably about 1% to 2%, and formed into granules. The size of the grain is about 0 to 40 mm in diameter, and the grain of 0 to 10 mm accounts for 10% or less of the total amount of soil.
The granulated soil is used as it is as the outflow prevention material of the present embodiment described below.
[0009]
Further, as another embodiment of the outflow preventing material, even better results can be obtained by mixing the following materials to improve water permeability. The materials used and the mixing ratios are as follows.
(1) 50% of soil containing coagulant generated from water purification plants such as tap water and industrial water
(2) 10% of soil containing flocculant generated from waste paper recycling factory
(3) 20% of coal ash generated from thermal power plants
(4) 20% recycled chips at industrial waste disposal sites
The mixing ratio of the above-mentioned materials is an example, and can be changed according to the situation.
[0010]
The outflow of the red soil can be prevented by spraying the outflow prevention material configured as described above on the place where the red soil is exposed, about 2 cm to 4 cm.
This is a case where the outflow prevention material of the present embodiment is used as guest soil, for example, a case where a large area such as a field or a park is covered with soil as it is.
If the above-mentioned emulsion or the like is scattered, turf and trees cannot be planted in the area in the future. However, according to this method, turf and trees can be planted because the soil is not exposed.
[0011]
In addition, in the case of civil engineering work, since soil is dug up, soil cannot be scattered in a certain area as described above. Therefore, the outflow prevention material may be packed in a sandbag and placed in a place where water is expected to flow, or the outflow prevention material may be piled up like an embankment to make a weir.
Also, in places where the speed of water flow can be predicted to be high, it is necessary to set up a plurality of piles so that the embankment runoff preventive material is not washed away by the water, and install a net between them to surround the preventive material.
[0012]
In the case of rainfall, when the topsoil flows together with rainwater during rainfall, the topsoil runoff prevention weir made as described above does not stop rainwater like a conventional weir, but because the embankment soil is granular, It drains rainwater from the gaps in the soil.
In this case, the flow speed of rainwater is reduced by the weir, and the particles of the red soil flowing with the rainwater sink into the area dammed by the weir. Therefore, even if a sand basin is not formed, by making many weirs of the present embodiment, it is possible to prevent runoff of topsoil due to rainwater.
[0013]
When the weir is no longer necessary after the damming work is completed, the outflow prevention material used for the embankment can be disposed of by using it as horticultural soil, so that it can be reused without becoming industrial waste.
Furthermore, even if the place where the weir is made is used in a multipurpose open space or a green space after the work, the outflow prevention material can be used.
[0014]
【The invention's effect】
INDUSTRIAL APPLICABILITY According to the present invention, by spreading a certain thickness on the surface of land in a certain area, it is possible to prevent the outflow of topsoil such as red soil in the area and prevent the future effective use of land in the area.
In addition, rainwater containing topsoil and the like can be dammed up by a simple method, and the topsoil can be obtained by reasonably preventing only the topsoil from flowing down. Therefore, without damaging the soil, damming work can be performed easily and quickly.
Furthermore, since the outflow preventing material is mainly made of waste such as soil generated at the time of purifying tap water or industrial water, it also has the effect of reusing resources and saving energy.

Claims (4)

A topsoil outflow prevention method in which an outflow prevention material mainly composed of soil containing a flocculant is prepared, and then the outflow prevention material is deposited on a surface of the soil to a predetermined thickness to prevent outflow of topsoil. Create a runoff prevention material mainly composed of soil containing a flocculant, and then fill and pile up the runoff prevention material in a place where water flows, or place it in a sandbag bag and place a weir to create water. Topsoil runoff prevention method that prevents topsoil runoff by damming. The said outflow prevention material was formed by shaping | molding the soil containing the coagulant produced | generated at the time of purification of tap water, industrial water, etc. into the granular form of about 1%-17% of containing water, The Claims 1 or 2 characterized by the above-mentioned. The method for preventing topsoil outflow according to claim 2. The above-mentioned spill-prevention material is used for soil containing a flocculant generated during purification of tap water or industrial water, soil containing a flocculant generated from a waste paper recycling plant, coal ash generated from a thermal power plant and industrial The topsoil according to claim 1 or 2, wherein the recycle chips and the like at the waste disposal site are mixed at an appropriate ratio, and the mixture is formed into granules having a water content of about 1% to 17%. Spill prevention method.