JPS60248788A - Soil ground solidification - Google Patents

Abstract

PURPOSE:A solution which has been obtained by dissolving a synthetic resin with high affinity to soil ground and solubility in an organic solvent in a volatile organic solvent is sprayed and impregnated into soil to solidify the soil ground deeply without disturbance of the original ground and reduce or prevent the freezing. CONSTITUTION:A synthetic resin having high affinity to soil ground and dissolving in an organic solvent such as polyurethane, acrylic, polyester, epoxy or rubber polymer is dissolved in a volatile solvent such as benzene, toluene, xylene, methylene chloride, chloroform, cyclohexanone and the solution is sprayed in a concentration of about 20-30% at a rate of, preferably about 200-600g/m<2> for impregnation.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a construction method for solidifying soil.

(Conventional technology and problems) Conventionally, in order to improve soft ground, there has been a construction method in which chemicals such as cement and lime are mixed with the ground base material, or a water mixture of the above chemicals is sprayed into the ground using a nozzle. Are known.

However, these construction methods have the disadvantage of roughening the original ground because they mechanically mix the ground and chemicals, and therefore require time and effort such as leveling the ground and compacting it after construction. In addition, the injection mixing method has drawbacks such as the ground surface being raised, and construction is also troublesome.

Furthermore, in order to prevent topsoil from being eroded by feng shui, it is also known to solidify the surface layer by diluting a synthetic resin emulsion such as vinyl acetate with water and spreading it on the soil surface.

Synthetic resin emulsions have a relatively high viscosity and high surface tension, so they are difficult to penetrate into soil, and the solidification depth is about 2.5c+n at most. Therefore, a portion of the shallow solidified surface layer is damaged. Erosion is likely to occur from that area. - Means for Solving Problem C) The above-mentioned problems in the conventional method have been solved by the present invention.

The present invention is a soil solidification method characterized by spreading and permeating a solution of a soil-compatible and organic solvent-soluble synthetic resin in a volatile organic solvent.

In the present invention, the term "soil" refers to not only ground, but also playgrounds created by artificial embankment, floors of tennis courts, walls of underground construction, etc.
It also includes the ceiling surface.

Examples of synthetic resins that are compatible with soil and soluble in organic solvents include polyurethane-based, acrylic-based, polyester-based, epoxy-based, and rubber-based polymers. Such resins are well known in the field of synthetic adhesives and paints.

Examples of volatile organic solvents that dissolve synthetic resins include benzene, toluene, xylene, methylene chloride,
Examples include chloroform, monochlorobenzene, cyclohexanone, dioxane, acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, dimethylformamide, and the like. Most organic solvents are used in the form of a mixed solvent appropriate for the type of synthetic resin. Of course, solvents other than the upper one may be used or mixed as needed. It is selected depending on the condition of the soil, the degree of desired construction effect, etc. Generally, as the concentration increases and the amount of application increases, the degree of solidification of the soil also increases, but in practical terms, the concentration is about 20 to 30% and the amount of application is 200 to 60%.
07/lrf is preferable.

The solution may be applied to the soil over the entire surface of the soil, or may be applied in a grid pattern using a nozzle.

(Function) When a volatile organic solvent solution of a synthetic resin is sprinkled on the soil, the solution has a low viscosity and a low surface tension, so it penetrates deeper than when an emulsion is sprinkled and can easily solidify over several Cs. I can do it. The infiltrated solution loses its solvent through volatilization, and the soil particles are bound and solidified by the hardening of the synthetic resin, becoming impermeable to water.

In the case of grid-like spreading, the solution is spread from the soil surface, for example 40
Since it diffuses outward at a steep angle of ~50 degrees and penetrates, it maintains the strength of the lattice mesh part (unspreading part) to a certain extent, and also reduces the area ratio of the lattice to lattice mesh and the coarseness of the mesh. By adjusting the depth, the permeability of the soil can be adjusted.

(Effects of the Invention) According to the method of the present invention, not only can the surface of the soil be deeply solidified without roughening the original soil, but also the heat retention of the soil is increased, so the freezing depth of the soil in cold regions is reduced. , frost heave phenomenon can be prevented or reduced. In addition, it is also possible to solidify the soil and adjust water permeability by spreading it in a grid pattern.

Example 1 Unconfined compressive strength qu = 0.3 kVc4, water permeability coefficient 5
A mixture of 1 part moisture-curing polyol-based polyurethane resin [trade name Autosol, manufactured by Autoset Co., Ltd. (Osaka City)] and 1 part toluene-based thinner was applied to the ground of X10-'C/S at 8'OOP/d. It was spread and allowed to penetrate at a ratio of 1, and was allowed to cure for 3 days. The soil strength after curing is qu=5~8 kg/
ctl and the hydraulic conductivity decreased to 10XIO-8C/S. The solidification depth due to penetration of the polyurethane resin solution was 3 to 5G.

Example 2 8% cement and 3% quicklime (weight ratio) were added to valve waste mud (water content 150%) and solidified. - Axial compressive strength qu = 1.2-1.4 kg/cI #, hydraulic conductivity 2
It was X10'C/S. When the polyurethane resin and thinner mixture of Example 1 was infiltrated into this at 4oo, f/rd, and measured after curing for 3 days, qu ~5.4~7.2k
Q/aA had increased, and the hydraulic conductivity had decreased to 8X10 C76.

Example 3 Cement solidifying agent [Autoce, y h
O# 3500, Co., Ltd. t-)-ky)
A tennis court surface was prepared by adding 5% (by weight) of Ti (produced by Ti) and solidifying it. Its −axial compressive strength qu = 1
．． It was 4&9/c4. At this point, as a surface for sports, it lacks abrasion resistance and requires appropriate water permeability, so the same mixture of polyol-based polyurethane resin and thinner as in Example 1 was applied to the surface layer at 3001//lri.
The mixture was sprayed using a nozzle in the form of a lattice with a width of 2 to 3 cI11 and a square of 10 to 15 cIK at a ratio of: 3E! After curing, qu=
The hydraulic conductivity increased to 5.4 kQ/d, and the permeability coefficient was 10 x 10-" C76 for the part where the above mixed solution penetrated, and 6 x 10 C/S for the inside of the mesh where the liquid was not sprayed. I put on a usable all-weather coat and went up.

Patent Dekodai Autoset Co., Ltd. Agent: Patent Attorney Taku Takeuchi

Claims (1)

[Claims] 1. Synthetic resin that has soil affinity and is soluble in organic solvents as a volatile organic solvent! A soil solidification method characterized by spreading and permeating the dissolved solution into the soil. 2. The soil solidification method according to claim 1, wherein the spreading is carried out in a grid pattern.