JP2008063794A - Method of treating soil or building skeleton - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of treating soil or a building skeleton by using a composition containing carbon dioxide gas, the composition being easily infiltrated into the ground, being proof against degradation of the water permeability in the ground even if consolidated, and rarely affecting the circumferential environment. <P>SOLUTION: According to the method, the composition containing a polyvalent metallic compound and carbon dioxide gas as active ingredients is made to permeate or filled into the ground to form an insoluble salt. Then carbon dioxide gas is injected to an upstream side of a solution feeding pipe line 5 through a low-pressure carbon dioxide gas force-feeding pipe line 14, from a low-pressure carbon dioxide gas container 8-1, via a solenoid valve 10-1, a negatively pressurizing valve 11-1, and a carbon dioxide gas spray nozzle 15, to a polyvalent metallic compound aqueous solution (A solution) tank 1-1, and the other composition aqueous solution (B solution) tank 1-2. Alternatively, the polyvalent metallic compound aqueous solution and the carbon dioxide gas are sufficiently mixed together by a gas-liquid mixing device 2, followed by feeding the polyvalent metallic compound aqueous solution to which the carbon dioxide gas is absorbed by a filling pump 3, via the solution feeding pipe line 5 to a filling pipe 7. Further alternatively, the carbon dioxide gas is injected through a high-pressure carbon dioxide gas force-feeding pipe line 12, from a high-pressure carbon dioxide gas container 8-2, via a solenoid valve 10-2, a negatively pressurizing valve 11-2, and a carbon dioxide gas spray nozzle 13, to the feeding pipe 7 or the ground 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a soil treatment method such as ground improvement or consolidation of soil containing discharged soil, industrial waste, or harmful substances, and a building case for repairing a deteriorated part or a crack part of a building such as a concrete structure. It relates to the processing method. Here, the structure housing includes not only a concrete structure but also a stone structure or a block structure.

  Conventionally, when the soil is consolidated and the ground is improved, an injection material whose main component is water glass or cement is often used. These injection materials often use strong alkalis or strong acids. Therefore, handling is required, and groundwater in the ground may be contaminated with alkalis or acids. Is also not preferable. Furthermore, in the case of cement-based injection material, there was a limit to the permeability to the ground.

  Furthermore, when repairing deteriorated or cracked parts of a structural structure such as a concrete structure, conventionally, an organic or inorganic coating is applied to these deteriorated or cracked parts, thereby providing acid resistance, water tightness and seawater resistance. Improves sex. In particular, concrete is neutralized when in contact with acid. For example, it is neutralized in a relatively short time by carbon dioxide in the air. Moreover, when a reinforcing bar is built in the concrete frame, the concrete structure is destroyed due to expansion of the reinforcing bar due to rust.

  In order to solve the above problems, the applicant has applied for an invention described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-067819).

JP 2004-067819 A Japanese Patent Publication No. 07-057870

  Conventional water glass-based injections are those that produce a water-containing gel of silica in the ground to improve water-stopping properties. If the reaction material is reduced in order to increase the gelation time, the silica gel is re-eluted by the alkali of the unreacted water glass and durability cannot be obtained.

  In the case of an injection material using water glass and calcium chloride, when these aqueous solutions were mixed, almost all of them instantly gelled, so that only the periphery of the injection tube could be consolidated.

  Furthermore, in the case of a suspension-type injection material, it solidifies with high strength, but there is a limit to the penetration distance of the injection material, and the ground improvement range cannot be widened.

  Moreover, since the ground improved with the water glass injection material is strong in alkali, there is a problem in water quality such as affecting the trees on the ground.

  In the invention described in Patent Document 1 (Japanese Patent Laid-Open No. 2004-067819) by the present inventors, an alkaline earth metal compound and carbonic acid or carbonate are used as an injecting material, and this injecting solution is infiltrated into the soil or Injecting or mixing with soil, or spraying this injected solution on concrete frame to infiltrate, apply or inject to form insoluble salts such as calcium carbonate, causing water pollution without causing alkali pollution Not related to invention.

  Furthermore, the purpose of the invention of the prior application is not only to solidify the soil with high strength, but also to improve the ground over a wide range and with high strength. The flow of groundwater is not greatly changed, and a dense layer is formed on the surface of the concrete. In addition, the deterioration and cracks of the concrete structure are repaired. An object of the present invention is to provide a method for solidifying soil and a method for treating a concrete frame, which prevent the deterioration and improve the above-mentioned drawbacks of the known technology.

However, when water-soluble CaCl ₂ and poorly soluble Ca (OH) ₂ are used as polyvalent metal compounds as an example, when water-soluble carbonates such as sodium bicarbonate and sodium carbonate, it is easy to leach with groundwater. The caking property is low. In the case of poor solubility such as calcium carbonate, the solubility is low and the reactivity is low, so that the caking property is low.

  As described above, the invention of the prior application has a problem in that the contact time between the polyvalent metal compound and the carbonate is short in the presence of groundwater, and the caking property is low because the reactivity is low.

  In order to solve this problem, the present invention provides a method using carbon dioxide gas, which easily penetrates into the ground, and even when consolidated, the water permeability in the ground is not easily lost, and the surrounding environment is hardly affected. The present invention provides a method for treating soil or a building frame, such as a ground improvement method.

  In order to achieve the above-mentioned object, the present invention allows a composition containing a polyvalent metal compound and carbon dioxide gas to be infiltrated or injected into the soil, mixed with the soil, or infiltrated into the building frame. Or spray or coat to form insoluble salts and treat soil or building enclosures. Alternatively, the soil containing harmful substances is consolidated and the harmful substances are decomposed and purified. In the present invention, the carbon dioxide gas includes a case where it is used as carbonated water.

  In the present invention, carbon dioxide dissolves in water, reacts with the polyvalent metal compound as carbonated water, and becomes an insoluble polyvalent metal compound such as calcium carbonate, magnesium carbonate, or magnesium hydroxide. The focus is on the precipitation of soil gaps, rock wall cracks and concrete cracks, and the consolidation of soil, rock wall and concrete structures.

  The principle of the present invention will be described below.

  The carbon dioxide gas blown into the ground or the injection solution dissolves in the ground water or the injection solution, and the carbon dioxide reacts with calcium ions, so that calcium carbonate can be deposited and precipitated in the gaps and rock cracks in the ground.

Ca ²⁺ + CO ₂ + H ₂ O → CaCO ₃ ↓ + 2H ⁺

  Furthermore, in order to achieve the above-mentioned object, according to the method for treating a building housing of the present invention, a polyvalent metal compound is used as an active ingredient, a mixture of other compositions, or any one of them as liquid A, liquid B Injecting carbon dioxide gas into each liquid or mixture and / or mixing carbonated water in which carbon dioxide gas is dissolved, or infiltrating or mixing A, B liquid and carbon dioxide gas and / or carbonated water in the soil, Alternatively, the insoluble salt is formed by spraying, infiltrating, applying, or injecting the building housing.

  According to the present invention, an insoluble salt is formed by mixing (including injection) or coating (spraying or applying) a polyvalent metal compound and carbon dioxide gas and / or carbonated water into the soil or concrete frame as active ingredients. By forming it, the soil can be solidified without generating harmful substances and adversely affecting the environment, or the discharged soil can be consolidated, or the degraded or cracked parts of the concrete structure can be repaired. be able to.

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

  The soil consolidation method and the building case processing method according to the present invention are both a one-part injection material or a liquid A containing a polyvalent metal compound as an active ingredient, and other compositions as a liquid B. It may be used. One liquid or carbon dioxide gas or / and further carbonated water may be blown into either liquid A, liquid B, or both, or may be directly injected into the mixture of liquid A or liquid B or the ground after injection.

  In the injection by the conventional water glass grout or the like, if the injection material reaches the gel time during the injection, the fluidity is lost and the pressure rapidly increases. Furthermore, if it is injected more than that, the ground will be destroyed and the ground will be weakened or the ground will be displaced.

  Further, when water glass comes into contact with the hardener calcium chloride, the total amount of calcium and silica in both solutions reacts instantaneously to form a non-flowable gel. For this reason, in the water glass system, the injection range is large, and even if it is repeatedly injected, destruction or ground uplifting occurs.

  On the other hand, in the present invention, when carbon dioxide gas or / and further carbonated water is mixed in the soil or the concrete frame, it reacts with the polyvalent metal ions and precipitates between the soil particles or the concrete frame to fill the voids, It reacts very gently and the liquid does not gel, so the fluidity is not compromised.

  For this reason, even if the liquid is injected as it is, the whole amount does not react immediately, and the amount of white turbidity adheres to the particle surface in the ground, and penetrates into the ground as it is. However, if the injection is continued as it is, it will flow out to any extent. If the injection is interrupted to a certain extent and the pressurization is stopped, the reaction proceeds while the injection solution is held in the soil particle gap in that region.

  Therefore, if this process is repeated, the reaction product adhering to the surface of the soil particles will gradually thicken, eventually the soil particle gap will be filled with the reaction product, and the injected solution will not deviate beyond the required range. Mu

  Since carbon dioxide gas is a gas, it can enter voids in the fine ground and cracks in the structure body, and can react with polyvalent metal ions dissolved in the injection solution to fill the fine voids.

  In addition, the suspended polyvalent metal compound can react with carbon dioxide or carbonated water in which carbon dioxide is dissolved in water to fill large voids and cracks.

  Carbon dioxide can be blown from the gas cylinder into the ground or into the solution of the polyvalent metal compound at the cylinder pressure. Alternatively, liquefied carbon dioxide (dissolved carbon dioxide in water under pressure) or dry ice may be used.

Since carbon dioxide gas is a gas, CO ₂ can be absorbed without changing the concentration of the polyvalent metal salt solution, so that a higher strength can be obtained than when CO ₂ is reacted as carbonated water. Also, when the aqueous solution of the polyvalent metal compound exhibits an alkali, it is effective because the carbon dioxide gas dissolves and reacts easily.

  The present inventors paid attention to the fact that the reaction behavior of carbon dioxide and polyvalent metal compounds is very different from the gelation of conventional water glass grout, and by utilizing this characteristic, insoluble polyvalent metal compounds are formed in the ground. And completed the present invention.

  Further, if a silica component is added as an injection material composition to give a gelling function, a solidified body having excellent water blocking properties can be formed and consolidation can be accelerated.

  If the above polyvalent metal compound reacts with carbon dioxide or / and carbonated water in the soil, in the ground, or in a concrete frame, the carbonate, gas, mineral, calcite, gypsum of the polyvalent metal is reacted with the reaction product carbon dioxide. It is possible to artificially produce a precipitate similar to milkstone.

For example, when the polyvalent metal is Ca or Mg, CaCO ₃ , MgCO ₃ or the like is formed, and when it is Al, Al (OH) ₃ or the like is formed and precipitated. For example, when CO ₂ is reacted with an aqueous sodium aluminate solution, Al (OH) ₃ is generated and a crystalline one is precipitated.

NaAlO ₃ + 2H ₂ O + CO ₂ → Al (OH) ₃ + NaHCO ₃

In addition, even if the polyvalent metal compound is not water-soluble like CaCl ₂ and is hardly soluble like CaCO ₃ , CaSO ₄ , Mg (OH) ₂ , Ca (OH) _2, etc. Since Ca and Mg are dissolved in the form of ions, they react with carbon dioxide gas and penetrate into fine soil particles or cracks that cannot penetrate solids of sparingly soluble salts, forming precipitates. Occludes water permeability and causes water hardening.

  The cured product obtained from calcium carbonate as the main component in this way is a cured product that does not elute alkalis and acids and has no pollution. Although it is almost neutral, it artificially forms a crystal structure found in the cave in the long term. Therefore, the strength and the rate of formation of the crystal structure can be promoted by devising the formulation and construction method.

  This phenomenon is the same in the reaction of other sulfuric acid or phosphoric acid compounds with polyvalent metal compounds. In addition, in this invention, formation of a crystal structure is further accelerated | stimulated and an intensity | strength increase becomes quick by heating the above-mentioned mixing | blending liquid or both or any one of A liquid and B liquid.

  Examples of the polyvalent metal compound include oxides, hydroxides and chlorides of calcium and magnesium. Among these, polyvalent metal chlorides such as slaked lime, calcium chloride and magnesium chloride are particularly preferable.

Further, calcium salts, magnesium salts and calcium, hydroxides and carbonates of magnesium and aluminum, fine particle lime containing these, fine particle cement, and the like are also included. As these fine particle lime and fine particle cement, those having an average particle diameter of 10 μm or less and a specific surface area of 5000 cm ² / g or more are preferable.

  These polyvalent metal compounds are used alone or in combination of two or more. Since the injection solution containing these hardly soluble polyvalent metal compounds contains polyvalent metal ions corresponding to the solubility, when these mixtures are injected into the ground, solids are filled between cracks and soil particles, and the supernatant liquid is filled. Corresponding portions permeate between fine cracks and soil particles, and calcium carbonate is precipitated by carbon dioxide gas or carbonated water in which it dissolves to give water-stopping properties.

  At this time, a solid body is formed in which large-grain calcium carbonate, calcium ions, and calcium carbonate by carbonated water are integrated. In the above, when a polyvalent metal is contained as the liquid A, the concentration of the polyvalent metal compound in the liquid A is not particularly limited, but is preferably 1 to 30% by weight.

  Furthermore, the compound which comprises B liquid may use together carbon dioxide gas, or also carbonate and bicarbonate. Of course, some of these may be mixed on the liquid A side. Moreover, you may inject | pour into the ground the liquid mixture of the said all composition of this invention, A liquid, or B liquid simultaneously or with a time difference, and accelerate | stimulate the reaction in the ground.

  The calcium salt precipitated according to the present invention is calcium carbonate, calcium hydroxide, calcium chloride, calcium nitrate, aluminum dioxide or the like, and is affected by the ground and the composition to be injected.

  The concentration of the compound in the B liquid is a concentration at which the reaction with the polyvalent metal compound in the A liquid is sufficiently performed, and is also related to the concentration of the A liquid and the usage ratio of the A and B liquids, but preferably 0.1 to 30% by weight. Further, when solidifying a ground having poor water permeability, if it is solidified as much as possible into the ground, a low-concentration liquid is used and repeatedly infiltrated or injected into the soil or mixed with the soil.

  In the case of solidification of the liquid A and the liquid B, the mixed liquid of the above-mentioned all compositions according to the present invention is infiltrated or injected into the soil, or mixed with the soil to form an insoluble salt. And solidify the soil.

  The injection material according to the present invention consisting of the above-mentioned liquid A and liquid B can be used in combination with one or more of the compositions shown in the following (1) to (7). Is further improved.

(1) Composition containing water glass as an active ingredient This is, for example, a composition containing water glass and a curing agent as active ingredients. The water glass has a molar ratio of SiO ₂ / Na ₂ O = 2 to 6 and is manufactured industrially, or is obtained by adding a caustic alkali thereto. When used, it is diluted with water.

  Hardeners include bicarbonate, calcium chloride, sodium bisulfate, sodium aluminate, sulfate band, alum, etc., inorganic acids such as carbonic acid, sulfuric acid, phosphoric acid, hydrochloric acid, organic acids such as acetic acid, diacetin, triacetin And esters such as ethylene carbonate, cements such as glyoxal and fine particle cement, slags such as fine particle slag, and alkali agents such as slaked lime and caustic alkali.

  Any method may be used for this composition, but it is used by infiltrating before and after injecting the liquids A and B according to the present invention.

(2) Curable compositions other than water glass Specific examples include curable resin compositions such as epoxy resins and polyester resins.

(3) Composition comprising a hardly soluble calcium compound as an active ingredient In the present invention, the hardly soluble calcium compound is preferably calcium having a water solubility (20 ° C.) of 5% by weight or less, specifically calcium carbonate, cements. Slags, limes and the like.

  As this combination method, when the grounds A and B according to the present invention deviate due to non-uniform ground, it is preferable to use in combination mainly for the purpose of preventing this deviation, specifically, Before injecting the A and B liquids according to the present invention, they can be used together as a primary injection material. However, as described above, the production of calcium carbonate by the upper solution of a hardly soluble calcium compound can be used in the present invention.

(4) Composition containing fine particle slag or fine particle cement as an active ingredient As these fine particle slag and fine particle cement, those having an average particle diameter of 10 μm or less and a specific surface area of 5000 cm ² / g or more are used. In this case, as in the case of (3), the production of calcium carbonate by the supernatant can be used in the present invention.

(5) Composition containing alkali agent as active ingredient As the alkali agent, slaked lime, caustic alkali or the like is used.

(6) Composition containing active silica or colloidal silica as an active ingredient Active silica obtained by removing alkali from water glass using an ion exchange resin or an ion exchange membrane, acid radicals of acidic water glass, Examples include activated silica obtained by removing an alkali metal with an ion exchange resin and an ion exchange membrane, colloidal silica obtained by concentrating and granulating active silica.

  As the curing agent, inorganic salts such as sodium chloride and potassium chloride and acids or alkalis are used for adjusting the curing rate and pH.

(7) Carbon dioxide gas Carbon dioxide gas may be injected by injecting into the polyvalent metal compound, or carbon dioxide gas may be injected into the ground later to accelerate the caking due to the precipitation of calcium carbonate in the initial stage, and thus calcium carbonate. May be formed.

  Further, carbon dioxide or a mixed solution of carbon dioxide and water glass may be blown into the ground simultaneously with or after the injection of the present invention. This method and apparatus have already been disclosed by the present applicant (for example, Patent Document 2 (Japanese Patent Publication No. 07-057870)).

  Hereinafter, the present invention will be described in detail by way of examples.

[Example 1] Precipitation experiment of calcium carbonate An experiment of curing a polyvalent metal compound with carbon dioxide gas was performed.

As a polyvalent metal compound, 300 g of a ground solution containing 0.59 g of lime dissolved in 25 ml of distilled water (lime water) and ground containing a lot of shells, and after stirring well with 500 ml of distilled water, is filtered ( Two types of 25 ml of filtrate) were prepared.
Carbon dioxide gas was blown into the liquid at 1 L / min from a gas cylinder.
Observation was carried out after blowing at 25 ° C. for 2 hours.

  The results are shown in Table 1.

  When carbon dioxide was added to the liquid containing calcium, white calcium carbonate was precipitated. Moreover, the amount of precipitation increased by adding organic nutrient sources.

  Comparative Examples 1 and 2 were solutions containing calcium but not blowing carbon dioxide, and no precipitation of calcium carbonate was observed.

  Further, even when carbon dioxide was added to a solution containing no calcium, no precipitation of calcium carbonate was observed.

[Example 2]
A water permeability test was performed using a chemical solution containing a polyvalent metal compound and carbon dioxide.

(1) Materials used Polyvalent metal compounds:
Slaked lime Specific surface area: 10,000 cm ² / g
Calcium chloride dihydrate, reagent grade 1, magnesium chloride hexahydrate, reagent grade 1, carbon dioxide

(2) Formulation Calcium chloride (dihydrate) was dissolved in water to prepare a 20% (by weight) solution. Similarly, other polyvalent metal compounds were prepared.

  These are shown in Table 2.

  Carbon dioxide gas was blown into the liquid at 1 l / min through a nozzle.

(3) Penetration test into soil 90cm of Toyoura standard sand was filled in a plastic mold with a diameter of 5cm and a length of 1m. (Relative density 60%, hydraulic conductivity = 1.5 × 10 ⁻² cm / s). Then 1000 ml of water was allowed to flow down naturally. Next, 500 ml of liquid A and 500 ml of liquid B were mixed and allowed to flow naturally.

  The natural flow of the liquid mixture of liquid A and liquid B was defined as one cycle. This cycle was performed in two types: 5 cycles and 10 cycles.

  After completion, the upper and lower sides of the mold were sealed with a wrap and cured indoors. Uniaxial compressive strength was measured on the 7th day of curing.

(4) Water permeability test The solidified product was removed from the mold, and a pressure water permeability test was performed according to the measurement method (geological engineering society standard). The water pressure was 0.1 MPa.

(5) Results of water permeability test and uniaxial compressive strength Table 2 shows the results of comparing the present invention with water alone.

  Compared to the case of water alone, in the examples of the present invention, the water permeability coefficient decreased by about an order of magnitude, and it was found that the water stopping effect and the consolidation effect of the ground can be obtained.

  Table 3 shows the results when 5 cycles are repeated, the water permeability and the uniaxial compressive strength when 10 cycles are repeated. When 10 cycles were repeated, the hydraulic conductivity decreased by an order of magnitude more than 5 cycles. From this result, it was found that the present invention does not become impervious by a single injection as in general water glass, but the water permeability is lowered by repeated injection. This seems to be because the generated calcium carbonate is deposited in the gaps between the soil particles.

  Therefore, it was found that the decrease in water permeability can be arbitrarily controlled by the degree of repetition of injection. In addition, the characteristic of obtaining a consolidation effect while reducing water permeability while maintaining water permeability so as not to completely stop water is extremely unique in that ground improvement is carried out while retaining the original groundwater veins in the ground. It has been found that it has a characteristic that it can produce a great effect.

  In addition, such a feature has an epoch-making effect of having a drainage function while increasing the bearing capacity of the ground under the road. In addition, if it is used to reinforce the slope in order to maintain the drainage function while strengthening the ground, it will be possible to make groundbreaking ground improvement to prevent landslides.

Example 3
(1) Formulation Calcium hydroxide (slaked lime) and carbon dioxide using the formulation of Example 2 were used. The liquid temperature was 20 ° C.

(2) Experimental method 1) Concrete immersion test A mortar specimen (diameter 5 cm x length 10 cm) is immersed in 150 ml of the mixed solution of the present invention for a predetermined time, and then the mortar specimen is taken out of the liquid, lightly wiped, and left to stand. Cycle.
After immersion, the sample was removed from the solution, and the specimen was wrapped in a wrap and cured indoors.

2) Concrete application test The mixed liquid of the present invention was applied to the entire surface of a mortar specimen (diameter 5 cm x length 10 cm) with a brush having a width of 4 cm.
The coating amount was confirmed by the change in weight of the mortar specimen after coating. After the application, it was allowed to stand at room temperature for 30 minutes or more, and this was defined as one cycle.

3) Concrete spray test The mixed liquid of the present invention was sprayed on one side of a mortar specimen (diameter 5 cm x length 10 cm) with a coating machine and left for 30 minutes or more. This was made one cycle and sprayed several times.

(3) Results Table 4 shows the results. In any of the infiltration, coating, and spraying, the permeability coefficient was lowered and an improvement was seen compared to the untreated one.

Furthermore, when forming an insoluble salt using the ground injection agent of the present invention,
(1) A method in which carbon dioxide gas is blown into liquid A containing a polyvalent metal compound as an active ingredient, or water (carbonated water) into which carbon dioxide gas has been blown is blended,

(2) A method in which carbon dioxide gas is blown into liquid B containing a compound other than a polyvalent metal compound as an active ingredient, or water (carbonated water) into which carbon dioxide gas has been blown is blended,

(3) A method of blending water (carbonated water) into which carbon dioxide gas is blown or carbon dioxide gas is blown into a liquid obtained by mixing the liquid A and the liquid B.

(4) After mixing (including injection) the solution A and solution B into the soil or concrete frame, or after coating (spraying or coating), or at the same time, osmotic mixing or coating, or coating with carbon dioxide. A method of osmotic mixing or filming water (carbonated water)
Can also be used.

Example 4
FIG. 1 is a flow sheet for explaining a method of mixing carbon dioxide gas in the actual ground in the present invention. Mainly, the A and B liquid feed pipe lines 5 and a plurality of systems (two systems in FIG. 1) carbon dioxide pressure feed. A pipe line, that is, a high-pressure carbon dioxide pressure feed line 12 and a low-pressure carbon dioxide pressure feed line 14, and an injection pipe 7 inserted into the ground 6 are configured.

  A and B liquid feed pipes 5 are piped from the polyvalent metal compound aqueous solution (A liquid) storage tank 1-1 and the other composition aqueous solution (B liquid) storage tank 1-2 to the injection pipe 7 inserted into the ground 6. Then, as shown in FIG. 1, the gas-liquid mixing device 2, the injection pump 3, and the flow meter 4 are arranged in the liquid feeding line 5 from the upstream side, respectively.

  The high-pressure carbon dioxide pressure feeding line 12 is connected to the high-pressure carbon dioxide container 8-2 via the connection pipe 9-2 and is connected to the injection pipe 7. An electromagnetic valve 10-2, a pressure reducing valve 11-2, and a carbon dioxide gas blowing nozzle 13 are disposed in the pipe 12 respectively. Although not shown, the carbon dioxide gas blowing nozzle 13 can be provided in the injection pipe 7.

  The low-pressure carbon dioxide pressure feed line 14 is connected to the reduced-pressure high-pressure carbon dioxide container 8-1 through the connection pipe 9-1 in the same manner as the high-pressure carbon dioxide pressure feed line 12, and the aqueous solution storage tank 1-1, 1-2 or piped to the upstream side of the gas-liquid mixing device 2 in the liquid feeding pipeline 5. Similarly to the above, the solenoid valve 10-1, the pressure reducing valve 11-1, and the carbon dioxide gas blowing nozzle 15 similar to the above are arranged in the pipe line 14, respectively.

  According to the apparatus of the present invention having the above-described configuration, the low-pressure carbon dioxide container 8- The carbon dioxide gas is injected into the aqueous solution from 1 through the electromagnetic valve 10-1, the pressure reducing valve 11-1, and the carbon dioxide blowing nozzle 15, and then the polyhydric metal compound, the other composition and the carbon dioxide gas are fed by the gas-liquid mixing device 2. Mix well to increase the absorption rate of the carbon dioxide gas into the aqueous solution, and the polyhydric metal compound aqueous solution in which the carbon dioxide gas is absorbed by the injection pump 3 is sent to the injection pipe 7 through the liquid supply line 5.

  Further, carbon dioxide is injected into the injection pipe 7 from the high-pressure carbon dioxide container 8-2 via the electromagnetic valve 10-2, the pressure reducing valve 11-2, and the carbon dioxide blowing nozzle 13 via the high-pressure carbon dioxide pressure feed line 12.

It is explanatory drawing of one specific example of the injection apparatus of the injection material concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aqueous solution storage tank 2 Mixing tank 3 Injection pump 4 Flowmeter 5 Aqueous solution liquid supply line 6 Ground 7 Injection pipe 8 Carbon dioxide gas container 9 Connection pipe
10 Solenoid valve
11 Pressure reducing valve
12 High-pressure carbon dioxide gas supply line
13 Carbon dioxide blowing nozzle
14 Low pressure carbon dioxide gas supply line
15 Carbon dioxide blowing nozzle

Claims (5)

  A composition containing polyvalent metal compounds and carbon dioxide as active ingredients is infiltrated or injected into the soil, mixed with the soil, or infiltrated or sprayed into the building enclosure or coated to form an insoluble salt. A method for treating soil or a building frame, characterized in that:   The soil according to claim 1, wherein the polyvalent metal compound is one or more selected from the group consisting of chlorides, carbonates, hydroxides, sulfates, and cements or slags of polyvalent metals. Or the processing method of a building frame.   The composition according to claim 1, further comprising infiltrating or injecting into the soil a composition containing one or more selected from the group of carbonates, bicarbonates, and polyvalent metal compounds as an active ingredient, Alternatively, a method for treating soil or building enclosures comprising mixing with soil, or infiltrating or spraying or covering the building enclosure to form an insoluble salt.   The composition containing a carbon dioxide gas as an active ingredient is injected once or a plurality of times according to claims 1 to 3 into a soil or a structure housing in which a composition containing a polyvalent metal compound as an active ingredient is injected or mixed. The processing method of the soil or building frame. Injecting the composition which uses a sparingly soluble polyvalent metal compound as an active ingredient in soil or a structure housing | casing in Claims 1-3, and also inject | pours the composition which uses a water-soluble polyvalent metal compound as an active ingredient further. A method for treating soil or building enclosures.

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