JP2961484B2 - Chemical solution for ground injection and ground injection method using this liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention provides a high-strength solidified product, and it is easy to adjust a gelling time over a wide range, especially a relatively long gelling time, and has a low viscosity until gelation. It has excellent permeability to keep the soil, and therefore, a ground injection chemical and liquid that are particularly suitable for injection into permeable ground such as sandy soil.
The present invention relates to a ground injection method using a medicinal solution .

[0002]

2. Description of the Related Art Generally, it is very difficult to adjust a chemical solution for injection, which is an inorganic system for permeating sandy soil or the like, has low viscosity and has a long gelation time. However, although this adjustment is possible under strict control, deterioration of the consolidation strength is inevitable. That is, it is almost impossible to expect improvement in both the permeability and the strength of the inorganic injection chemical liquid.

On the other hand, organic chemicals for injection can be expected to improve both permeability and strength. However, in general, this is not only extremely expensive, but also requires COD during construction management. There is a problem that inspection is required.

[0004]

Accordingly, an object of the present invention is to provide a wide range of gelation time, especially a long gelation time, even though it is an inorganic chemical solution, and furthermore, until the gelation occurs. It is an object of the present invention to provide a liquid for ground injection in which the permeability is excellent and the consolidation strength is improved to maintain a low viscosity, and the above-mentioned disadvantages of the known art are improved.

[0005]

According to the present invention, a water glass having a molar ratio in the range of 1.5 to 2.8 and a water glass having an average particle diameter of 10 μm or less are provided according to the present invention. 50 surface area
It is characterized by containing fine particle slag of at least 00 cm ² / g as an active ingredient, and, if necessary, further comprising a cement and / or lime or, further, a calcium elution amount regulator. .

[0006]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail.

The water glass used in the present invention is J
The molar ratio is lower than that of IS3 water glass, and the molar ratio is in the range of 1.5 to 2.8. The amount of the water glass in the total chemical, in an amount of 1.5 to 20% by weight in terms of SiO ₂ in water glass.

The slag has an average particle diameter of 10 μm.
m or less, and the specific surface area is 5000 cm ² / g or more, preferably 80 cm ² / g or more.
Fine particle slag of not less than 00 cm ² / g.

The present invention contains the above-mentioned water glass and fine particle slag as active ingredients, thereby gelling in a relatively long time, maintaining low viscosity until gelation, and preventing sedimentation. To obtain a homogeneous and strong compact.

Furthermore, the present invention relates to the above-mentioned water glass-slag system, wherein cement and / or lime, especially a specific surface area is added.
5000 cm ² / g or more, preferably 8000 cm ² / g or more, each having an average particle diameter of 10 μm or less, fine-particle cement and lime are added and mixed, and further a calcium elution amount modifier is added and mixed, gelation time, It is also possible to adjust the permeability or the consolidation strength.

Examples of the calcium eluted amount regulator include sodium hydrogen carbonate, sodium carbonate, disodium hydrogen phosphate and sodium hexametaphosphate. These potassium salts are, of course, pyrophosphates, acid pyrophosphates, tripolyphosphates. , Tetrapolyphosphates, condensed phosphates as sequestering agents such as acidic metaphosphates and sequestering agents such as ethylenediaminetetraacetate, nitrotriacetate, citrate, tartrate and sodium phosphate, phosphorus Examples include ordinary phosphates such as sodium hydrogen oxyoxide. Among them, soluble alkali agents such as bicarbonate, carbonate and phosphate including condensed phosphoric acid are particularly suitable.

In the present invention, any reactant capable of adjusting the gel time may be used in combination. The reactants are listed below.

Esters Fatty acid esters of monohydric alcohols such as ethyl acetate, methyl acetate, butyl acetate and amyl acetate. Ethylene glycol diacetate, glycerin triacetate,
Fatty acid esters of polyhydric alcohols such as succinic diesters. (All esters). Intramolecular esters such as δ-butyrolactone and ε-caprolactone. (Cyclic esters: lactones). Ethylene glycol monoformate, ethylene glycol monoacetate, ethylene glycol monopropionate, glycerin monoformate, glycerin monoacetate, glycerin monopropionate, glycerin diformate, glycerin diacetate, sorbitol monoformate, Polyhydric alcohol partial esters such as sorbitol monoacetic acid ester, glycolic acid monoacetic acid ester, low polymerization degree partially saponified vinyl acetate and the like. Diacetoxyethylene

Embedded image Unsaturated fatty acid esters such as. Carbonates such as cyclic carbonates such as ethylene carbonate (ethylene carbonate), propylene carbonate (propylene carbonate), and glycerin carbonate;

Aldehydes: Dialdehydes such as glyoxal, succinic dialdehyde, malondialdehyde, succinaldehyde, glutardialdehyde, and furfural dialdehyde.

Amides: formamide, dimethylformamide, acetamide, dimethylacetamide, propionamide, butylamide, acrylamide, malondiamide, pyrrolidone, caprolactam and the like.

Alcohols: monohydric and polyhydric alcohols such as ethyl alcohol, methyl alcohol, amyl alcohol, glycerin and polyvinyl alcohol, or synthetic high molecular alcohols.

Acids: inorganic acids such as sulfuric acid, hydrochloric acid and phosphoric acid. Organic acids such as formic acid, acetic acid, malonic acid, succinic acid, maleic acid and tartaric acid.

Inorganic salts: chlorides such as calcium chloride, sodium chloride, magnesium chloride, potassium chloride, and aluminum chloride; sulfates such as calcium sulfate, sodium sulfate, and aluminum sulfate; and aluminates such as sodium aluminate and potassium aluminate. Hydrochloride such as ammonium chloride, zinc chloride, aluminum chloride, sodium chlorate,
Chlorate such as potassium chlorate, sodium perchlorate, potassium perchlorate, etc., carbonate such as sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, sodium bisulfate, bisulfuric acid Potassium, bisulfite such as ammonium bisulfite, sodium bisulfite, potassium bisulfite, bisulfite such as ammonium bisulfite, sodium sulfite, potassium sulfite such as potassium sulfite, alkaline earth metal salt of silicic acid,
Silicates such as aluminum salts, borates such as sodium borate, potassium borate and ammonium borate; hydrogen phosphates such as sodium hydrogen phosphate, potassium hydrogen phosphate and ammonium hydrogen phosphate; sodium pyrosulfate; Pyrosulfates such as potassium sulfate and ammonium pyrosulfate; pyrophosphates such as sodium pyrophosphate, potassium pyrophosphate and ammonium pyrophosphate; dichromates such as sodium dichromate, potassium dichromate and ammonium dichromate; Permanganates such as potassium manganate and sodium permanganate.

Organic salts: sodium acetate, sodium succinate, potassium formate, sodium formate, sodium citrate and the like.

Metal oxides such as quicklime, alumina, iron oxide and magnesium oxide, and Ca, Al and Mg salts.

Furthermore, in the present invention, any gelling agent such as an aqueous solution of acidic silicic acid or any other gelling agent can be used in combination. In addition, pozzolans such as fly ash, diatomaceous earth, diatomaceous earth, and clay may be used in combination, and a chemical solution for injecting into the ground, which makes use of the respective properties, may be blended. In addition, a small amount of a dispersing agent may be used in combination to prevent sedimentation, whereby a uniform solidified body can be obtained at all times.

The above-mentioned chemical liquid for injection of the present invention is injected, for example, by preparing a one-liquid chemical liquid of the present invention in which the gelation time is adjusted to be long and injecting it into the ground as it is, or Injection is performed by injecting a cement-based injection material thereinto, and then injecting the chemical solution into the injection location.

Furthermore, the water glass compounded liquid according to the present invention may be referred to as liquid A, the compounded liquid containing the fine particle slag according to the present invention may be referred to as liquid B, and both AB liquids may be combined and injected.
In addition, the above-mentioned water glass and slag or, furthermore, a compounding solution containing a calcium elution amount regulator is referred to as a liquid A, and a gelling accelerator compounding liquid or any other gelling agent compounding liquid is referred to as a liquid B. They may be merged and injected after adjusting the gel time of the drug solution arbitrarily.

Further, a double injection tube was prepared, and the drug solution of the present invention in which the gelation time was adjusted to be long was designated as solution A, and the gelation accelerator-containing solution was designated as solution B. The liquid is fed into the ground from separate pipes of the pipe, and the two liquids are joined at this tip to form a grout with a short gelation time, which is injected into the space around the injection pipe to form a packer,
It is also possible to inject only the solution A.

Further, a water glass composition according to the present invention,
Or the water glass and slag, or even formulation solution containing calcium elution weight modifier thereto was a solution A, Yuruyui
The liquid mixture containing the reactive agent is liquid B, the liquid containing the instantaneous reactant is liquid C, and the gelation time obtained by combining both AC liquids is short.
After the grout is injected into the ground, the process may be switched to the injection of the AB combined liquid, and the above steps may be repeated while raising the injection stage.

Further, water glass and slag (which may contain a calcium elution amount adjusting agent if necessary) are referred to as liquid A, and the flash reactant compounding liquid is referred to as liquid C. the grout from the top outlet of the double pipe, the slow-setting property grout consisting of a liquid from the lower discharge port, respectively can be injected into the ground at the same time.

Further, a slag and, if necessary, a calcium elution amount modifier are added to the water glass to prepare a chemical solution having a long gelation time of several hours (a chemical solution which does not lead to gelation may be used). A liquid and a mixed liquid containing slag or another reactant are used as a B liquid. At the time of construction, the B liquid is added to the A liquid to form a chemical solution of the present invention having a predetermined gelation time and strength. It can also be injected inside.

Further, the No. 3 water glass blended liquid having a molar ratio higher than 2.8 was designated as liquid A, and the water glass blended liquid of the present invention having a molar ratio in the range of 1.5 to 2.8 was designated as liquid B. the binding reaction blending was brought to solution C, the particulate slag liquid combination according to the present invention as D solution, later by injecting Madokayui grout consisting AC merged liquid in the ground, the present invention consisting BD if the flowing liquid The compound injection can be performed by injecting the slow-release drug solution according to (1).

[0029]

There is known a chemical which comprises cement as a main material and has a low molar ratio of water glass applied thereto to prolong the gelation time. This means that the gelation time is extended at most several minutes to 10 minutes. The reason for this is that the water glass S
A large amount of CaO, which is liable to react with iO ₂ , is contained, which reacts rapidly with the SiO _{2 of the} water glass, and as a result, it is considered that the gelation time is shortened. Moreover, this chemical consumes CaO of the cement, so that the original strength of the cement cannot be found.

[0030] In contrast, in the slag to be used in the present invention is less CaO content in the reaction tends to form against the SiO ₂ component of the water glass is allowed as compared to the cement, Therefore, water glass SiO ₂ Reaction is unlikely to occur.

Further, the alkali content in the water glass stimulates the potential hydraulic characteristics of the slag, and calcium ions are released from the slag. This calcium ion is Si of the water glass.
In addition to reacting with O _2, it also reacts with SiO _{2 of} the slag and gradually solidifies to form calcium silicate with a long gelling time, thereby obtaining a solidified material having a high solidification strength.

When cement is further added to the water glass-slag system described above, the cement promotes the reaction of the water glass-slag system by its self-hardening and reaction with the silica content of the water glass. Therefore, the gelation time of this system is shortened,
The strength is increased with a slight increase in viscosity.

Although limes are hardly soluble in water, their solubility increases in the presence of water glass. When this lime is added to the water glass-slag system described above, it promotes the reaction of this system and exhibits the same action as cement.

The above action is affected by the alkali of the water glass. Therefore, the molar ratio of the water glass in the present invention is suitably in the range of about 1.5 to 2.8, and the concentration of the water glass is determined by the SiO _{As two} components, 1 . About 5 to 20% is appropriate.

The slag, cement and lime used in the present invention are useful for adjusting the gelling, viscosity and consolidation strength of water glass, but the average particle diameter depends on the size of these particles. 10 μm or less, the specific surface area is 5000 cm ² / g or more, preferably 8000 cm ² / g or more, an appropriate amount of alkali of water glass, as a stimulant, a large slag silica content, a small silica content of water glass. And calcium combine with each other to form a gel of strong composite silica calcium having a high density.

In other words, the space of the large silica net caused by the slag is filled with the small silica caused by the water glass, and the calcium is connected and solidified to form a dense cured product.

Furthermore, when a calcium elution amount regulator is added to the system of the present invention, for example, when a carbonate, bicarbonate or phosphate is added, inactive calcium carbonate or calcium phosphate is formed, thereby delaying gelation. be able to.

In the above, if the molar ratio of the water glass is lower than 1.5, the alkali content becomes excessive and does not gel, or the gelation time becomes so long as to be impractical as an injection material and consolidation occurs. Becomes insufficient, and the viscosity increases, so that it is difficult to perform clear gelation in a state where the viscosity remains increased. In addition, from the viewpoint of pollution, excess alkali is likely to cause groundwater contamination.

When the water glass has a molar ratio of No. 3 or more, that is, a molar ratio of about 2.8 or more, the amount of alkali in the water glass is small, and it is insufficient to stimulate the latent hydraulic property of the slag to harden it. Therefore, the slag cannot exhibit the original strength. For this reason, the water glass and the slag do not easily react with each other, and not only the gelation is greatly extended, but also the slag and the water glass are separated, and it is difficult to obtain a uniform solidified body.

If the particle size of the slag is coarser than the above range, not only does the permeability to sand be impaired, but also the reaction between the alkali of the water glass and the slag is greatly reduced, resulting in a gelation suitable for injection. Gelation does not occur within the range, and the expression of the solidification of water glass by alkali becomes insufficient.

That is, according to the present invention, the average particle size is
10 µm or less, the specific surface area is 5000 cm ² / g or more reactive fine particle slag, and the molar ratio is 1.5 to
By using water glass of 2.8, a wide range of gelation time can be obtained for the first time, and excellent permeability to fine-grained soil can be obtained.

In addition, by using cement and / or lime in combination with such a water glass and slag system, the gelation time can be shortened effectively, and further, a calcium elution amount modifier is used in combination. This effectively delays the gel time, thereby making it possible to easily control the gel time.

When the molar ratio of water glass is 1.5 or less, an extremely large amount is required to shorten the gelation time by adding limes and cement, and the viscosity is greatly increased to exhibit a thixotropic property. As a result, the permeability is greatly reduced. Moreover, it is impossible to significantly reduce the gelation time.

On the other hand, in the range of water glass according to the present invention, the gelation time can be effectively shortened even with a small amount of cement or lime. This does not result in a significant increase in viscosity and therefore does not impair permeability. In the range of water glass according to the present invention, slag can maintain low viscosity without exhibiting thixotropic properties such as cement and lime in the presence of water glass.
This is presumably because CaO in the slag contains a small amount of CaO, such as cement or lime, which is easily released, and is released only when a predetermined amount or more of alkali is present.

[0045]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to examples, but the present invention is not limited thereto.

1. Materials Used (1) Water Glass Five types of water glass having different molar ratios shown in Table 1 were used.

[0047]

[Table 1]

(2) Slag SiO ₂ : 33.0 2%, CaO: 41.9 4%, Al ₂ O
_{3: 12.8 3%, MgO:} 8.6 1%, Fe 2 O 3: 0.3
A water slag having a component composition of 7% was pulverized, and four types of water slag having different specific surface areas and average particle sizes shown in Table 2 were used.

[0049]

[Table 2]

(3) Cement SiO ₂ : 22.2%, CaO: 64.6%, Al ₂ O ₃ :
Portland cement having a component composition of 5.4% and Fe ₂ O ₃ : 3.1% was pulverized, and three types of Portland cement having different specific surface areas and average particle diameters shown in Table 3 were used.

[0051]

[Table 3]

(4) Lime Three types of powdered industrial slaked lime shown in Table 4 were used.

[0053]

[Table 4]

(5) Calcium elution control agent The most general-purpose industrial sodium hydrogen carbonate (NaHCO)
₃ ), sodium carbonate (Na ₂ CO ₃ ), disodium hydrogen phosphate (Na ₂ HPO ₄ .12 H ₂ O), and sodium hexametaphosphate [(NaPO ₃ ) ₆ ] were used.

2. Water glass-slag system Table 5 shows the formulation, gel time, viscosity, and uniaxial compressive strength of the system consisting of the water glass in Table 1 and the slag in Table 2.
The uniaxial compressive strength shows the result of a sand gel specimen obtained by filling a standard sand and a compounding solution while mixing them in a mold. However, the 7-day strength indicates the strength after curing in the mold, and the 49-day strength indicates the strength after curing in the mold for 7 days and after curing in water. Table 6, Table 7
The same applies to the strength test results.

[0056]

[Table 5]

In Table 5, the run Nos. 1 to 20 are 1000 g in total.
In the five types of water glass in Table 1, the SiO ₂ concentration was 8
%, And each of the four types of slags in Table 2 was mixed. Of these, the run Nos. 1-4 were 2.9 molar ratios
Gelling time is too long with water glass of No. 6, and although it is highly viscous, its strength is weak and it is separated from the supernatant. In addition, working Nos. 17 to 20 are water glasses having a molar ratio of 1.37, and have the same tendency in this case, and have particularly high viscosity.

On the other hand, in Examples Nos. 5 to 16 using water glass within the scope of the present invention, all of Examples Nos. 5, 9 and 13 containing slag No. 1 in Table 2 had low viscosity and high strength. Is shown. In particular, the slags No. 3 and 4 in Table 2 (specific surface area is 8000 cm ² /
g, average particle diameter of 10 μm or less)
The effects are remarkable in 8, 11, 12, 15, and 16.

From these results, the water glass used had a molar ratio of about 1.5 to 2.8, and the slag used had an average particle diameter of 10 μm or less.
It can be seen that those having a specific surface area of 5,000 cm ² / g or more, particularly 8000 cm ² / g or more, exhibit extremely remarkable effects.

Runs Nos. 21-28 combine the water glass of No. 3 in Table 1 with the slag of No. 4 in Table 2 within the scope of the present invention.
This is an example in which the concentration of water glass is changed. Water glass S
Implementation with very low iO ₂ concentration (1.37%) Implementation of NO.21 with low strength and very high SiO ₂ concentration (21.9%)
NO.28 has high viscosity, short gelation time and low strength. As described above, the concentration of the water glass is suitably in the range of about 1.5 to 20% in the amount of SiO ₂ in the blended liquid.

3. Water glass-slag-cement / slaked lime system Based on the water glass-slag system of the above 2 and mixing this system with cement and / or slaked lime, the formulation, gel time, viscosity, and uniaxial compressive strength are shown in Table 6. Show.

[0062]

[Table 6]

In Table 6, Run No. (15) is a rewrite of Run No. 15 in Table 5 consisting solely of water glass and slag as a control. Run Nos. 29 to 35 are systems in which part of the slag of Run No. 15 is replaced with cement. In each case, the viscosity increases, the gelation time is shortened, and the strength is enhanced.
The degree is remarkable as the amount of cement increases. As for the cement particles, the finer, that is, from No. 1 in Table 3 to No. 2
Furthermore, the gelation time is shortened and the strength is strengthened as the particles are reduced to NO.3, but good results are obtained in which the increase in viscosity is small, and in particular, the average particle diameter is 10 μm or less, and the specific surface is 5000 cm ² /
g or more (implemented NO. 30, 33), more preferably 8000 cm ² /
The effect is remarkable in the case of g or more (implementation Nos. 31 and 34).

Examples Nos. 36 to 42 are systems in which part of the slag is replaced with slaked lime, and show a tendency similar to that of cement. The tendency is even more pronounced than with cement.

Although the viscosity increases as described above, the gelling time is shortened, and the strength, particularly the initial strength, is clearly enhanced. Therefore, when the water glass-slag system of the present invention is partially combined with cement and lime, particularly fine particle cement and fine lime, the gelation time is shortened even if the permeability is somewhat sacrificed, and the strength, particularly the initial time, is reduced. It is effective when applied to the target ground where the strength is desired.

4. Water glass-slag-calcium elution amount controlling system Based on the water glass-slag of the above 2, the calcium elution amount adjusting agent has a particularly effective soluble alkali agent, that is, sodium hydrogen carbonate, sodium carbonate, For a system in which disodium hydrogen phosphate and sodium hexametaphosphate were added and mixed, the formulation and gelation time,
Table 7 shows the viscosity and the uniaxial compressive strength.

[0067]

[Table 7]

In Table 7, Run No. (12) is a reproduction of Run No. 12 in Table 5 consisting of water glass-slag as a control. Run Nos. 43-52 are based on the water glass-slag system of Run No. 12 with sodium bicarbonate,
It is a system to which sodium carbonate, disodium hydrogen phosphate and sodium hexametaphosphate are added.

As the amount of addition increases, the gelation time becomes longer and the viscosity tends to gradually decrease, but the strength of the consolidated body tends to decrease gradually, albeit slightly. Therefore, it is effective when applied to the target ground where the gelation time is prolonged but the permeability is desired to be improved, although the strength cannot be enhanced.

5. Penetration Test and Alkali Elution Test A penetration test of the drug solution according to the present invention was performed using the injection device shown in FIG. In FIG. 1, 1 is a compressor, 2,
3 is a pressure gauge. A chemical solution 6 according to the present invention is filled in a water tank 5 provided with a stirrer 4 connected to the compressor 1.

Reference numeral 7 denotes an acrylic mold into which sand 8 is filled. The chemical 6 filled in the water tank 5 is introduced into the sand 8 in the acrylic mold 7 by the operation of the compressor 1. Here, the chemical solution 6 is permeated into the sand 8, and the chemical solution 6 that has been permeated is collected in the measuring cylinder 11,
The penetration situation is measured. 9 and 10 are wire nets. Table 8 shows the sand 8 filled in the acrylic mold 7, and Table 9 shows the measurement results of the penetration test.

[0072]

[Table 8]

[0073]

[Table 9]

The symbols in Table 9 have the following meanings. ：: The injection liquid discharged from the mold gelled normally. Internal solids are normal. Δ: The gelation of the discharged injection liquid was delayed, and the internal consolidation was hard at the lower part but weak at the upper part. ×: The discharged injection liquid was not gelled, and the internal solidification state was only the lower part and the upper part was not. XX: A uniform specimen cannot be obtained. (Note) The uniaxial compressive strength is the strength (K
gf / cm ² ).

The specimen after the above-mentioned permeation test was formed in a water tank having a depth of 20 cm, a width of 50 cm and a length of 50 cm.
It was buried in mountain sand up to 10 cm, immersed in water to 10 cm, and after 10 days, water was collected from the end of the aquarium and the pH was measured. Table 10 shows the results.

[0076]

[Table 10]

The symbols in Table 10 have the following meanings. ：: pH is 10 or less. Δ: pH is 10 to 10.5. X: pH is 10.5 or more.

From the above test results, when water glass having a molar ratio of 2.8 or more was used (Experiments Nos. 5 to 8 in Table 9), slag was separated and permeation was insufficient. When water glass having a molar ratio of 1.5 or less was used (Experiments Nos. 9 to 1 in Table 9).
2) is highly viscous and the consolidation at the upper part of the consolidated body is insufficient. In Experiments Nos. 1 to 4 in the scope of the present invention, excellent penetration results were obtained.

Further, in the pH test of the immersion water, as shown in Table 10, when the molar ratio of water glass was 2.8 or more (Experiment Nos. 17 to 20), the water glass and slag separated, and the reaction between water glass and slag was insufficient. The alkali of the water glass is easily eluted and the pH increases. Molar ratio of water glass is 1.5 or less (Experiment NO.
In the case of 4), the pH is further increased due to excess alkali. Experiments Nos. 13 to 16 within the scope of the present invention showed a small increase in pH, less than 10.

From the above examples, it was found that water glass having a molar ratio of 1.5 to 2.8, an average particle diameter of 10 μm or less, and a specific surface area of about 50
It can be seen that a system consisting of only fine particle slag of at least 00 cm ² / g, preferably at least about 8000 cm ² / g, is sufficiently excellent in permeability and consolidation strength.

Further, based on the above system comprising water glass-slag, cement, limes, preferably having an average particle diameter of 10 μm or less and a specific surface area of about 5000 cm ² / g
Above, more preferably about 8000 cm ² / g or more of fine particulate cement, slag or calcium elution amount adjuster is added and mixed, gelation time, permeability, consolidation strength so as to be most suitable for the ground to be injected Can be adjusted.

In the present embodiment, ordinary water glass in which silica sand and alkali are melted is used. However, an alkali water may be added to No. 3 water glass to adjust the molar ratio to 1.5 to 2.8. .

As the slag, a water slag is taken as an example, but other silicate slags can also be applied. The cement used is general-purpose Portland cement, but can be applied to other blast furnace cement, alumina cement, and the like. As for limes, industrial slaked lime is taken up, but quick lime also changes to slaked lime in water and shows a tendency similar to slaked lime.

[0084]

【The invention's effect】

1. In the liquid chemical for ground injection composed of water glass and slag, water glass having a molar ratio in the range of about 1.5 to 2.8 and an average particle diameter of about 10 μm or less and a specific surface area of about 5000 cm ² / g or more, By using a fine particle slag of preferably about 8000 cm ² / g or more, a relatively long gelation time is required while maintaining a low viscosity, and solidification is surely performed, and a high-strength consolidated body can be obtained for a long period of time.

2. Based on the water glass-slag system of 1 above, cement, lime, and cement having an average particle diameter of about 10 μm or less and a specific surface area of about 5000 cm ² / g or more, more preferably about 8000 cm ² / g or more However, mixing with limes slightly increases the viscosity, but the viscosity can be adjusted so as to shorten the gel time, and the strength can be increased.

3. Based on the water glass-slag system of 1 above, by adding a calcium elution amount modifier thereto, the strength is slightly reduced, but the viscosity can be reduced and the gelation time can be adjusted to be delayed. Can be improved.

[Brief description of the drawings]

1 shows a schematic view of an apparatus for injecting a chemical solution into sand.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 4 Stirrer 5 Water tank 6 Chemical solution 7 Acrylic mold 8 Sand

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C09K 17/10 C09K 17/10 P E02D 3/12 101 E02D 3/12 101 // C09K 103: 00

Claims (8)

(57) [Claims] 1. A water glass having a molar ratio in the range of 1.5 to 2.8, an average particle diameter of 10 μm or less and a specific surface area of 5000 cm ² / g.
A liquid for ground injection containing the above-mentioned fine particle slag as an active ingredient. 2. The fine particle slag having a specific surface area of 8000 cm ² /
2. The chemical for ground injection according to claim 1, which is not less than g. 3. The ground injection chemical solution according to claim 1, further comprising cement and / or limes. 4. The cement and lime according to claim 3, each having an average particle size of 10 μm or less and a specific surface area of 5000 cm ² /
The chemical for ground injection according to claim 3, which is not less than g. 5. The cement and the lime according to claim 3, each having an average particle diameter of 10 μm or less and a specific surface area of 8000 cm ² /
The chemical for ground injection according to claim 3, which is not less than g. 6. The chemical solution for injection into the ground according to claim 1, further comprising a calcium elution amount regulator, wherein the calcium elution amount regulator is selected from the group consisting of carbonate, bicarbonate and phosphate. The chemical for ground injection according to claim 1. 7. The method according to claim 1, wherein the amount of water glass is S in the water glass.
Ground injection drug solution according to claim 1 in iO ₂ is 1.5 to 20 wt% as calculated. 8. A water glass having a molar ratio higher than 2.8 is referred to as a liquid A, a water glass having a molar ratio in a range of 1.5 to 2.8 is referred to as a liquid B, and a flash reactant-containing liquid is referred to as a liquid C. Liquid, average particle size 10μm
In the following, the fine particle slag having a specific surface area of 5,000 cm ² / g or more is referred to as a D liquid, and an instantaneous setting grout composed of an AC combined liquid is injected into the ground, and then a warming chemical liquid composed of a BD combined liquid is injected. Characteristic ground injection method.