JP4642311B2 - Topsoil prevention method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a method for preventing outflow of topsoil such as red soil flowing out from a construction site, farmland, earth and sand breakage, or the like.
[0002]
[Prior art]
In general, when the amount of rainfall is about 30 mm per hour, the surface of the soil is shaved by rain, and the soil particles become fine and the topsoil flows out. Alternatively, it was necessary to prevent the red soil from flowing out because the red soil particles flowed out to the sea at a place where the water flow rate was fast, such as an inclined surface.
[0003]
Conventionally, as a method for preventing the outflow of topsoil such as red soil, there has been a method of covering the surface of the soil by seeding bond or emulsion on the surface of the bare soil generated during construction.
Other methods include covering the soil surface with a plastic sheet during rain to prevent the soil from flowing out, creating a sand basin to slow down the time it takes for the water containing red soil generated during the rain to reach the sea, There was a method of making a weir to dam the top soil with concrete, etc., damming up the water containing red soil, and sinking out the red soil particles there.
[0004]
[Problems to be solved by the invention]
Of these conventional methods, the former method of covering the soil surface with an emulsion or the like is not preferable because it roughens the surface of the soil.
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 out of the weir, but it exceeds the rainfall of a certain amount or more. In such a case, red soil overflows from the weir with rainwater, and the effect of preventing topsoil outflow is lost.
The present invention has been made to solve such problems of the conventional example.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the gist of the present invention is to form a spill preventive material by forming a soil containing a flocculant generated during purification of tap water or industrial water into granules, and then the spill If the topsoil flows together with rainwater during raining, the rainwater only flows from the gap between the granular runoff prevention materials, and the topsoil is discharged into the rainwater. Is a topsoil runoff prevention method that prevents topsoil runoff by sinking to a place blocked by a weir.
Further, the gist of the present invention is generated from a soil containing a flocculant generated during purification of tap water or industrial water, a soil containing a flocculant generated from a used paper recycling factory, and a thermal power plant. Coal ash and industrial waste treatment plant recycling chips are mixed, and the mixture is formed into granules to create a spill prevention material. After that, the spill prevention material is embanked in a place where water flows to create a weir. When the topsoil flows together with rainwater, only rainwater flows from the gaps between the granular runoff prevention materials, and the topsoil that has leaked into the rainwater sinks to a place blocked by a weir to prevent the topsoil from flowing out. This is a method for preventing topsoil outflow.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
When tap water, industrial water, or the like is purified, soil containing a flocculant called sludge or cake is generated at the time of purification. In this embodiment, this soil is used. Other soils can be used as long as they contain a flocculant. For example, soil comes out from a dam construction site, but it is possible to add a flocculant to the soil.
[0007]
In addition, the flocculant is a known chemical agent, which acts to solidify the soil by solidifying the fine particles of the soil floating in the raw water in the process of purifying water and submerging it into a floc form. Also called an agent.
Since the soil of this embodiment is hardened by this flocculant, it is stable even if it is formed into a granular shape, and does not melt 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 water supply, industrial water, etc. is adjusted to a moisture content of about 1% to 17%, preferably about 1% to 2% and shaped into granules. The size of the grains is about 0 to 40 mm in diameter, and the grains of 0 to 1 mm are 10% or less with respect to the total amount of soil.
The granulated soil is used as it is as an outflow prevention material of this embodiment shown below.
[0009]
As another embodiment of the outflow prevention material, better results can be obtained by mixing the following materials in order to improve water permeability. The materials used and the mixing ratio are as follows.
(1) 50% of soil containing flocculants generated from water purification plants such as tap water and industrial water (2) 10% of soil containing flocculants generated from waste paper recycling plants
(3) 20% of coal ash generated from thermal power plants
(4) 20% recycled chips from industrial waste disposal sites
The mixing ratio of the above materials is an example, and can be changed depending on the situation.
[0010]
The outflow of the red soil can be prevented by spraying the outflow prevention material configured as described above to a place where the red soil is exposed to about 2 cm to 4 cm.
This is a case where the spill prevention material of the present embodiment is used as a customer's soil, for example, a case where the surface is covered with soil as it is in a wide area such as a field or a park.
If the above-mentioned emulsion is sowed, it will not be possible to plant turf or trees in the area in the future, but according to this method, turf or trees can be planted because the soil is not exposed.
[0011]
In addition, in the case of civil engineering work, the soil is dug up, so it is not possible to spread the soil in a certain area as described above. Therefore, the spill prevention material may be packed in a sandbag and placed in a place where water is expected to flow, or the spill prevention material may be piled up like a bank to make a weir.
Also, in places where it can be predicted that the speed of water flow is high, it is necessary to set up a plurality of piles so that the embankment spill prevention material will not be washed away with water, and to put a net between them to surround the prevention material.
[0012]
The topsoil runoff prevention weir made in the above way is not covered with rainwater like the conventional weir when the topsoil flows along with rainwater when it rains. The rainwater oozes out from the gaps in the soil.
If it does in this way, the flow speed of rainwater will become slow by said dam, and the particle | grains of the red soil which flowed with rainwater will sink to the place stopped by the dam. Therefore, it is possible to prevent topsoil outflow due to rainwater by making many weirs of this embodiment without making a sand basin.
[0013]
When the dam work is completed and the weir is no longer needed, the spill prevention material used for the embankment can be disposed of by using it as horticultural soil, so it can be reused instead of being industrial waste.
Furthermore, even when the place where the weir is made is used for a multipurpose plaza, a green space, etc. after the work, the outflow prevention material can be used.
[0014]
【The invention's effect】
According to the present invention, topsoil can be obtained by damping rainwater containing topsoil by a simple method and preventing the topsoil from flowing down without difficulty. Therefore, it does not roughen the soil, and at the same time, the damming work can be done easily and quickly.
Furthermore, since the outflow prevention material mainly uses waste such as soil generated during purification of tap water, industrial water, etc., it also has the effect of reusing resources and saving energy.

Claims (2)

Molding soil containing flocculant generated during purification of tap water and industrial water into granules to create a spill prevention material, then embanking the spill prevention material in the place where water flows, creating a weir,
If the topsoil flows along with rainwater during rainfall, only the rainwater flows from the gaps between the granular runoff prevention materials, and the topsoil that has leaked into the rainwater sinks to a place blocked by a weir. Preventing topsoil outflow. Soil containing flocculant generated during purification of tap water and industrial water, soil containing flocculant generated from waste paper recycling plant, and coal ash generated from thermal power plants and recycling chips for industrial waste treatment plants The mixture is formed into a granular shape to create a spill prevention material, and then the spill prevention material is embanked in a place where water flows to create a weir,
If the topsoil flows along with rainwater during rainfall, only the rainwater flows from the gaps between the granular runoff prevention materials, and the topsoil that has leaked into the rainwater sinks to a place blocked by a weir. topsoil runoff prevention method for preventing.