JPH0721182B2 - Injection method of cement-based liquid and carbon dioxide - Google Patents

Description

TECHNICAL FIELD The present invention relates to an invention for mixing and injecting a cement liquid and carbon dioxide into the ground.

[Technology of Conventional Example] Conventionally, according to JP-A-53-108610 and JP-A-53-96212, a cement-based liquid such as a cement milk-based liquid and carbon dioxide gas are mixed and injected into the ground. The construction method is known. When the cement-based liquid and the carbon dioxide gas are mixed and injected into the ground in this way, the penetration of the cement-based liquid into the soil becomes easy due to the prior preferential permeability in the void in the ground of the carbon dioxide gas, The penetration of the cement-based liquid into the soil particles is reliably performed, and it becomes possible to penetrate well even in soil that is difficult to penetrate when the cement-based liquid alone is used alone.
Further, the cement-based liquid and the carbon dioxide gas react with each other to be cured quickly.

[Problems to be Solved by the Invention] By the way, when carbon dioxide gas and a cement-based liquid are mixed in a closed container, the drug heats up to 50 ° C to 60 ° C, and when such heat is generated, the viscosity of the cement-based liquid increases, However, there is a problem that the penetration force between soil particles becomes weak. On the other hand, if the cement particles are coarse, they are caught between the soil particles and have a weak osmotic force. Therefore, considering the osmotic force, the smaller the cement particles are, the higher the osmotic force is. Also, the smaller the cement particles, the higher the strength. Therefore, in recent years, use of ultrafine particle cement has been performed. However, if ultrafine cement, carbon dioxide and water are mixed and injected into the ground, the heat generated by the reaction with carbon dioxide will cause the viscosity to rise even higher than that of normal cement when ultrafine cement is used. However, there is a problem that the penetrating force is weak although the cement-based liquid is satisfactorily permeated into the ground by utilizing the prior-priority permeation property.

The present invention is invented in view of the problems of the above-mentioned conventional example, the purpose is to mix the cement-based liquid and carbon dioxide gas to permeate into the ground, heat generation during permeation Can be suppressed and penetrated well,
It is another object of the present invention to provide a method for injecting a cement-based liquid and carbon dioxide gas, which can generate heat by the reaction between the cement-based liquid and carbon dioxide gas after infiltration and cure quickly.

[Means for Solving the Problems] In order to solve the problems of the above-mentioned conventional examples and achieve the object of the present invention, the method for injecting the cement-based liquid and carbon dioxide gas of the present invention mainly includes cement milk and cement milk. It is characterized in that a mixed liquid obtained by mixing a cement-based liquid such as the mixed liquid described above and dry ice in the form of granules or sorbets is injected into the ground.

Further, a mixed liquid obtained by mixing cement or a cement-based material mainly composed of cement, cooling water cooled by a cooling means, and dry ice in the form of granules or sorbets may be injected into the ground.

[Action] However, since a mixed liquid obtained by mixing cement-based liquid such as cement milk, a mixed liquid mainly composed of cement milk, and granular or sherbet-like dry ice is injected into the ground, carbon dioxide and cement Suppresses the reaction with the system liquid to delay heat generation, does not generate heat during permeation into the ground, suppresses the increase in viscosity, and uses the prior priority permeability of carbon dioxide gas to permeate the cement system liquid Can be done well.
Further, since the granular or sherbet-shaped dry ice is mixed with the cement-based liquid, when mixing the carbon dioxide with the cement-based liquid, the carbon dioxide gas can be easily added to the cement-based liquid without the need for a special pressurizing device. It can be mixed and injected into the ground. After permeation, the temperature of the carbon dioxide gas or the cement-based liquid that has been cooled rises, and the carbon dioxide gas reacts with the cement-based liquid to quickly cure the cement-based liquid.

[Examples] The present invention will be described in detail below based on examples.

First, a first embodiment of the present invention will be described. In this embodiment, a mixed liquid obtained by mixing a cement liquid and dry ice is injected into the ground. The cement-based liquid used here is cement milk, a mixed liquid mainly composed of cement milk, or the like. Then, cement, which is a material of the cement-based liquid, water, and other materials, and granular and sherbet-shaped dry ice are mixed and kneaded,
In this way, the mixed liquid obtained by mixing the cement-based liquid and the dry ice is injected into the ground. In this case, the mixed solution may be injected under pressure. When the mixture of cement-based liquid and dry ice is poured into the ground, the granular, sherbet-shaped dry ice becomes cold carbon dioxide gas,
The voids between soil particles in the ground penetrate first and preferentially, followed by the cement-based liquid. Further, when the carbon dioxide gas and the cement-based liquid are mixed, fine bubbles are formed, the fine bubbles easily penetrate into the soil, and when the fine bubbles collide with the soil particles and are destroyed. The gas first enters between the soil particles, and then the cement-based liquid enters. In this way, the cement-based liquid penetrates well between the soil particles. In this case, the carbon dioxide gas is still cooled as it has just changed from dry ice to gas, so that it is suppressed from reacting with the cement-based liquid during permeation, and the viscosity of the cement-based liquid is prevented from increasing due to heat generation. Therefore, it does not hinder the permeation of the cement-based liquid. For this reason, even if ultrafine particle cement is used as the material of the cement-based liquid, it is possible to satisfactorily penetrate it. After the permeation is completed, the carbon dioxide gas gradually increases in temperature and reacts with the cement-based liquid to generate heat, which contributes to quick hardening of the cement-based liquid. In this case, unnecessary carbon dioxide gas dissolves easily in groundwater immediately after infiltration because it is cold, and when the cement liquid hardens, unnecessary carbon dioxide gas remains and the hardened part of the cement liquid is porous. It is designed to prevent the water from becoming watertight and prevent deterioration in strength. From the viewpoint of improving the permeability of the cement-based liquid by utilizing the precedence preferential permeability of carbon dioxide, it is preferable that the amount of carbon dioxide is large. There is no problem even if the amount of is increased. Further, since the carbon dioxide gas is mixed in the dry ice state, it is easy to mix with the cement-based liquid, and a special pressure mixing device for mixing the carbon dioxide gas is not required. By the way, when carbon dioxide gas is cooled as in the present invention, even if carbon dioxide gas is mixed in 10% of the cement amount, carbon dioxide gas of about 20% of the cement amount actually reacts with the cement after permeation for the reasons described above. Since the excess carbon dioxide other than that is used for cooling, it can be easily dissolved in groundwater to prevent the formation of a porous part in the hardened part of the cement liquid. When carbon dioxide gas is added to 10% of the amount of cement as described above, the excess carbon dioxide gas does not escape and a porous portion is formed in the hardened portion of the cement liquid, which causes water stoppage and strength reduction.

Next, another embodiment of the present invention will be described. In this embodiment, a cement-based material mainly composed of cement, cooling water cooled by a cooling means, and dry ice are mixed and poured into the ground. In this embodiment, by using the cooling water in the case of using the dry ice, the cooling rate by the dry ice can be suppressed to a low amount by the cooling water, and the usage amount of the dry ice can be reduced. .

By the way, in injecting a mixed liquid obtained by mixing the cement-based liquid in the present invention and the granular or sherbet-shaped dry ice into the ground, various conventionally known methods of injecting the cement-based liquid into the ground are adopted. This is possible, and by pouring in this way, pile retaining walls and piles of soil cement are formed in the ground.

[Effects of the Invention] In the present invention, as described above, cement-based liquids such as cement milk and mixed liquids containing cement milk as a main component,
Since a mixed solution of dry ice in the form of granules or sorbets is injected into the ground, it suppresses the reaction between carbon dioxide gas and cement-based liquid to delay heat generation, and heat is generated during permeation into the ground. Without increasing the viscosity of the cement-based liquid, it is possible to satisfactorily permeate the cement-based liquid by utilizing the precedence preferential permeability of carbon dioxide gas. It can also be used for high-viscosity materials, and the temperature of the carbon dioxide gas or cement-based liquid that has been cooled after infiltration rises and the carbon dioxide gas reacts with the cement-based liquid to cure the cement-based liquid quickly. It can be done. Moreover, since carbon dioxide is cooled and permeated into the ground, even if the amount of carbon dioxide is increased, excess carbon dioxide is cold after permeation and is easily dissolved in groundwater. It is possible to increase the amount of carbon dioxide gas mixed as a result without the possibility of forming a porous part in the hardened part of the carbon dioxide, and it is possible to further utilize the prior preferential permeability of carbon dioxide gas. It is a thing. Moreover, when the carbon dioxide gas is mixed with the cement-based liquid and injected into the ground, the cement-based liquid and a mixed solution of granular or sherbet-shaped dry ice are injected into the ground, so It does not require a special pressurizing device for mixing carbon dioxide gas, and it is sufficient to simply mix. It is easy to mix, and since dry ice is used, it is easy to handle and has a cooling capacity. It is expensive.

In addition, in the case of injecting a mixed liquid obtained by mixing cement or a cement-based material mainly composed of cement, cooling water cooled by cooling means, and dry ice in the form of granules or sherbet into the ground, the above-mentioned effect is obtained. In addition, there is an advantage that the cooling rate of dry ice can be kept low by the amount of cooling with cooling water, and the amount of dry ice used can be reduced.

Claims (2)

[Claims] 1. A cement system characterized by injecting into the ground a mixture solution of cement-based liquid such as cement milk or a mixed liquid mainly composed of cement milk, and dry ice in the form of granules or sorbets. Injection method of liquid and carbon dioxide. 2. A mixture of cement or cement-based material mainly composed of cement, cooling water cooled by a cooling means, and granular or sherbet-shaped dry ice is poured into the ground. A method of injecting cement-based liquid and carbon dioxide.