JP2002030652A - Method for insoluble improved soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent soluble earth and sand from being converted into sludge and muddy water as the result of rainfall and flowing out into rivers, lakes or the sea, etc., by improving the soluble earth and sand into insoluble earth and sand differing in nature from conventional improved earth. SOLUTION: Insoluble earth and sand 1 is dumped into a mixing vessel 5 and mixed with an aqueous solution 55 of a cement type improver 51 and a fibrous material 52 to produce primary improved earth 10. The primary improved earth 10 is mixed with an aqueous solution 65 of a polymer based improver 61 and agitated to produce insoluble improved earth 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving soluble earth and sand into insoluble earth and sand. INDUSTRIAL APPLICABILITY The insolubility-improved soil method of the present invention can be applied to the prevention of sludge and turbidity of soluble earth and sand caused by rainwater or the like.

[0002]

2. Description of the Related Art The conventional improved soil technology has been to improve the quality of soil by mixing and mixing a cement-based modifier, a lime-based modifier or a gypsum-based modifier with earth and sand. These improved soils had the property of dissolving in rainwater or the like and turning into sludge and turbidity.

[0003]

DISCLOSURE OF THE INVENTION Fine soil particles of soluble earth and sand are dissolved in rainwater and turned into sludge to become turbid water, and rivers,
Runoff to lakes, seas, etc. These accumulate on the bottom surface to kill aquatic organisms and promote environmental destruction. An object of the present invention is to improve insoluble soil and soil different from the properties of the conventional improved soil, and to suppress sludge from rainwater or the like to become turbid water and flow out to rivers, lakes, seas, and the like. Was.

[0004]

Means for Solving the Problems Natural earth and sand, which is usually in a dry state, becomes sludge by rainwater or the like and generates muddy water. In order to suppress these natural phenomena, there has been a demand for a technique for improving the properties of soil and sand so as not to cause sludge and turbidity. In order not to dissolve the fine soil particles in rainwater or the like, it was necessary to improve them to insoluble soil particles. The soil improved by the cement-based modifying agent of the prior art is disadvantageous in that it is dissolved in rainwater, turned into sludge, and dried to solidify into a rock mass. The soil improved by the lime-based modifier and the gypsum-based modifier was dissolved in rainwater and turned into sludge and turbidity. The fine soil particles in the dissolvable earth 1
1 and the aqueous solution 55 of the fibrous substance 52 are agglomerated into fine soil particles by mixing and stirring, and further mixed with the aqueous solution 65 of the polymer / polymer modifier 61, and sludge is formed with rainwater.
It has been found that the insolubility-improved soil 20 does not become turbid. According to laboratory experiments, it was found that the dry
The amount of suspended solids eluted after adding 900 cc of water to 0 cc and stirring was 500 PPM or more, but the amount of suspended solids under the same conditions after improvement to insoluble soil was reduced to 35 PPM. there were.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described with reference to an embodiment in which soluble soil such as a field or bare land is converted into an insoluble improved soil. The dissolving earth and sand 1 collected by the excavating means, the transporting means, and the like are charged into the mixing tank 5 by an appropriate amount. The volumes of the aqueous solutions 55 and 65 of the improving material to be mixed and stirred with the volume of the soluble earth and sand 1 in the mixing tank 5 are determined. Aqueous solution of improver 55
Is prepared by mixing 20% of cement-based modifier 51 per unit weight of water 50 with 3% of cement-based modifier 51 of fibrous substance 52 per unit weight of water 50 with stirring mixer 53. 50 kgf per unit volume (1 m ³ ) of the dissolving earth and sand 1 is charged into the mixing tank 5 and mixed with the dissolving soil 1 to form the primary improved soil 10. The cement-based modifier 51
Ordinary Portland cement, blast furnace cement, alumina cement and the like can be used. As the fibrous substance 52, methyl cellulose, carboxymethyl cellulose or the like can be used. A shovel dozer, a backhoe, or the like is used as a means for introducing the soluble earth and sand 1 into the mixing tank 5. The mixing tank 5 has a shape capable of measuring the volume, for example, a box shape, so that the volume of the soluble earth and sand 1 can be easily obtained. The mixing and stirring means is
An agitating bucket 15 having a bucket shape is used. The earth and sand bucket may have a rotating drum for mixing and stirring. Alternatively, a mixing and stirring means using a soil improvement machine may be used. An aqueous solution 65 of an improving material of 100 kgf to 200 kgf per unit volume (1 m ³ ) of the primary improved soil 10 is put into the primary improved soil 10 in the mixing tank 5 improved by the primary mixing and stirring, and mixed and stirred by the stirring bucket 15. To improve the insolubility-improved soil 20. The aqueous solution 65 of the improving material
2% of the polymer-based modifier 61 is mixed with the water 60 per unit weight of the water 60, and is produced by the stirring mixer 63. As the polymer-based modifier 61, a nonionic polymer, an anionic polymer, or the like can be used. In the step of mixing and stirring, it is not preferable in terms of handling that the improved soil 20 becomes sludge-like, and the mixing amount of the aqueous solution 65 of the polymer-based modifier is primarily improved according to the state of infiltration of the primary improved soil 10. 100k per unit volume (1m ³ ) of soil 10
Adjust within the range of gf to 200 kgf. In the step of mixing and stirring, by installing a plurality of mixing tanks 5, the step of improving soil can be continuously performed. The insolubility-improved soil 20 can be compacted in an appropriate wet state. Insoluble improved soil 20
Is composed of aggregated soil particles and has good drainage properties.

[0006]

According to the present invention, there has been shown an example in which the soluble soil, which is naturally present in, for example, a field or a bare land, is improved to the non-elutable soil by the above steps. There is a lot of sediment with the property of sludge and turbidity caused by rainwater, and the distribution area is huge. The present invention is based on
Depending on the use of the improved soil, the improved soil means can be adapted to the right person in the right place. For example, in the case of impermeable ground, instead of the improvement tank 5, a depression may be provided so that the volume can be measured, and the improvement may be performed in the same manner as described above. Alternatively, continuously improved soil can be produced by a soil improvement machine having a measuring device. With mobile mixing equipment, improved soil can be obtained at the improvement site. In the Okinawa region, Kunigami Merge,
Red soil, called Shimajiri Merge, becomes muddy water every time it rains and flows into the ocean, killing coral reefs and destroying the environment. The method for improving the soluble earth and sand of the present invention into insoluble earth and sand can be applied as a solution to the above-mentioned problems and the like.
In addition, by improving the soil quality of the topsoil during the construction work, improving the soil of the fields and bare ground, or improving the soil of the ground, it is possible to prevent the sediment from becoming sludge, muddy water, etc. due to rainwater and flowing out. . According to the present invention, the drainage function can be recovered by improving the ground with reduced drainage into a ground with good drainage. Since it is rich in drainage compared to conventional improved soil, it can be used as a surface material for sports fields, parks, pedestrian passages, and the like.

[Brief description of the drawings]

 FIG. 1 shows a flow of the present invention.

[Explanation of symbols]

 Reference Signs List 1 soluble soil 5 mixing tank 9 mixed soil (primary mixed soil) 10 primary improved soil 15 stirring bucket 19 mixed soil (secondary mixed soil) 20 insoluble improved soil 50 water 51 cement-based modifier 52 fibrous substance 53 Stirring mixer 54 Tank 55 Aqueous solution 56 Stirrer 60 Water 61 High molecular polymer modifier 63 Stirring mixer 64 Tank 65 Aqueous solution 66 Stirrer

Claims (4)

[Claims] 1. A step of mixing and agitating a water 50, a cement-based modifier 51, and an aqueous solution 55 of a fibrous substance 52 in a soluble soil 1 to form a primary improved soil 10; An insolubility-improved soil method comprising a step of mixing and stirring an aqueous solution 65 of a polymer-based modifier 61 to form the insolubility-improved soil 20. 2. An aqueous solution 55 according to claim 1, wherein
The amount of the cement-based modifying material 51 per unit weight of 0 is 20%, and the amount of the fibrous substance 52 is 3% of the cement-based modifying material 51. . 3. The aqueous solution 65 according to claim 1, wherein
A method for improving the insolubility, characterized in that the blending amount of the polymer-based modifier 61 per unit weight of 0 is 2%. 4. A process for mixing the aqueous sediment 1 with 50 kgf per unit volume of the dissolvable soil 1 to obtain a primary improved soil 10; A method for insolubility-improved soil comprising a step of mixing 100 kgf to 200 kgf per unit volume of the primary improved soil by stirring and mixing the aqueous solution 65 described in (1) to obtain the insolubility-improved soil 20.