JP3523567B2 - Chemical solution for soil stabilization and ground stabilization method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement-based soil stabilizing chemical solution and a ground stabilization method using the same.

[0002]

2. Description of the Related Art A chemical solution obtained by mixing a main agent solution containing hydraulic cement and a hardening agent solution containing a hardening agent--a so-called cement-based soil stabilizer, has a hardening time of a wide range of several seconds to several tens of minutes. It is used as a material to stabilize the ground, such as strengthening the soft ground and stopping water in the spring ground, because it has high strength and durability.

In the cement-based soil stabilizer, an aqueous dispersion of hydraulic cement is used as the main agent liquid (referred to as liquid A).
On the other hand, as the hardening agent liquid (referred to as liquid B), a liquid in which a hardening accelerator for hydraulic cement or a hardening accelerator and a hardening inhibitor are dispersed or dissolved in water is used. Usually, A solution and B solution are separately prepared, and the obtained A solution and B solution are sent to a Y-tube or a mixer provided at the tip of the injection tube using an injection pump and mixed, The obtained mixed chemical solution is injected into the ground and hardened to stabilize the ground.

However, the conventional cement-based soil stabilizer has the following problems. 1) It is suitable as a stabilizer for a soil with a small amount of water, but when a chemical solution is injected into a large void or cavity in the soil that is filled with water, it is diluted with water and dispersed. The curing time of the chemical liquid becomes extremely long, or the chemical liquid flows out without being sufficiently cured.

If the curing time of the chemical liquid is within 1 to 2 hours or if the delay from the set value is not large, the chemical liquid is injected to the first location and then the injection pipe is moved to the adjacent first position. It is possible to continue the chemical solution injection work to the two places in sequence. However, as described above, if the curing time of the chemical solution injected into the first location exceeds the set value by more than 2 hours due to the influence of water, and it becomes significantly longer than 1 day, the The chemical liquid injected into the 1st place is further diluted with the boring water in the 2nd place and the hardening is hindered, and the ground stabilization becomes uncertain.

In order to prevent this, a long time may be waited for the liquid medicine to harden, or an area where the influence of the boring water does not reach the first area may be selected as the second injection area. The distance for moving a heavy boring machine will increase, and in both cases workability and construction efficiency will deteriorate. Further, in the method in which the liquid A and the liquid B are mixed and the hydration reaction of the cement is promoted to a certain extent, and the chemical liquid that is difficult to disperse in water is injected into the ground, the chemical liquid is hardened in the mixing tank or the injection pipe. It is difficult to use because it is difficult to pump and transport.

2) In the liquid A, cement is simply dispersed in water, and when the stirring and mixing of the liquid A is stopped, a solid-liquid separation phenomenon (breathing) occurs. Further, when a water-insoluble curing agent is used, the solid-liquid separation phenomenon occurs in the liquid B as in the liquid A. Further, even in the chemical liquid obtained by mixing the liquid A and the liquid B (hereinafter, simply referred to as “A-B mixed chemical liquid”), solid-liquid separation is hardly observed if the curing time is within about ten and several seconds. When the curing time exceeds 10 seconds, solid-liquid separation occurs.

When solid-liquid separation occurs in the transport pipe or the injection pipe of the liquid A or the liquid B, clogging occurs and the injection work is hindered. In addition, the composition is non-uniform and the curing time is not stable, and the strength of the cured product varies, and the desired strength cannot be obtained. Furthermore, since the AB mixed chemical liquid may undergo solid-liquid separation, there is a problem that the volume of the cured body formed is affected by the curing time of the chemical liquid. When the hardening time of the chemical liquid is short, a hardened body having a volume substantially equal to the volume of the injected A-B mixed chemical liquid is formed, and a solidified body of earth and sand corresponding to this volume is formed in the ground. However, when the curing time of the chemical liquid is long, solid-liquid separation of the chemical liquid progresses over time and the volume of the cured body decreases, so that the volume of the solidified sediment body formed becomes small and does not solidify in the ground. The part remains. There arises a problem that running water or ground subsidence occurs from this unconsolidated portion.

[0009]

DISCLOSURE OF THE INVENTION An object of the present invention is to separately provide liquids A and B, which are liquid chemicals used for ground injection,
In addition, the A-B mixed chemical liquid does not undergo solid-liquid separation in the mixing tank, the insides of these transport pipes and injection pipes are not clogged with particles of hydraulic cement or curing agent, and the chemical liquid is submerged in water in the ground. It is difficult to disperse even when injected, and it is possible to reliably cure within a short time without significantly delaying the curing time and shorten the waiting time when moving the injection point, and improve workability and construction efficiency, Moreover, it is an object of the present invention to provide a cement-based soil-stabilizing chemical liquid that forms a hardened body having high strength and durability with little variation in strength, and a ground stabilization method using the same. The cement-based soil stabilizing chemical of the present invention cures within 3 hours, preferably within 2 hours even when poured into water, and has a uniaxial compressive strength (after 1 day) of a cured product formed in water. A value corresponding to 60% or more, preferably 70% or more, of that of the cured product obtained when the chemical solution is cured in air can be expressed.

[0010]

Means for Solving the Problems As a result of intensive studies, the present inventors have added a water-soluble polymer or a water-soluble polymer and an antifoaming agent to solutions A and B of conventional cement-based soil stabilizers. Then, the respective viscosity is set to 900 centipoises (hereinafter referred to as cps) or more, and by using a chemical liquid having a viscosity of 900 cps or more obtained by mixing these liquids A and B, the above-mentioned object is achieved. The inventors have found that they can be achieved and completed the present invention.

A first invention of the present invention is a chemical liquid obtained by mixing a main agent liquid containing hydraulic cement and a hardener liquid containing a hardening agent, wherein the main agent liquid and the hardener are included. A cement-based soil stabilization chemical liquid in which a water-soluble polymer is added to each of the liquids to increase the viscosity to 900 centipoises or higher, and the viscosity obtained by mixing the base liquid and the hardening liquid is 900 centipoises or higher. " Is the gist.

The second aspect of the present invention is summarized as "a method for stabilizing the ground by injecting the cement-based soil-stabilizing chemical liquid of the first invention into the ground to cure it."

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The hydraulic cement used in the main component liquid (liquid A) of the chemical liquid of the present invention is ordinary Portland cement / early strength Portland cement / super early strength Portland cement / moderate heat Portland cement / low heat Portland cement. Various Portland cements such as sulfated Portland cement, high iron oxide type Portland cement, white Portland cement, mixed cements such as blast furnace cement, silica cement, fly ash cement, masonry cement, expansive cement, jet cement (super rapid hardening cement ) ・ Oil well cement, grout cement, sludge solidifying agent, high sulfate slag cement, special cement such as alumina cement, CaO ・ Al _{2
O 3, 12CaO · 7Al 2 O} 3, CaO · 2Al 2 O
_{3, 3CaO · Al 2 O 3} , 11CaO · 7Al 2 O 3
Calcium aluminate such as _{· CaF 2, 3CaO · 3Al 2} O 3 · CaSO 4 and the like. These hydraulic cements can be used alone or in combination of two or more. Incidentally, a part of the hydraulic cement fly ash, silica fume, blast furnace granulated slag, gypsum,
It can also be replaced with sewage sludge incineration residual ash.

The hydraulic cement used in the chemical solution of the present invention has an average particle size of 1 to 100 μm, preferably 1 to 100 μm.
The range of 50 μm is preferable. Normal commercial products can be used as they are, and normal Portland cement, blast furnace cement, early-strength Portland cement, etc. are preferably used. A hydraulic cement having an average particle size of more than 100 μm is not preferable because it causes solid-liquid separation in a short time. If the average particle size is less than 1 μm, solid-liquid separation is less likely to occur, which is preferable, but the cost for grinding is required.

The amount of hydraulic cement used in the chemical solution of the present invention is usually in the range of 20 to 400 kg, preferably 40 to 300 kg, and more preferably 60 to 240 kg per 200 liters of solution A. If the amount of hydraulic cement per 200 liters of liquid A is less than 20 kg, the strength of the hardened body formed will be low and the ground will not be sufficiently stabilized. On the other hand, if it exceeds 400 kg, the strength of the cured product will increase, but the viscosity of the chemical will increase significantly and it will be difficult to pump it, and the permeability of the chemical in the ground will decrease, forming it. The volume of the solidified sediment is small.

Generally, the liquid A containing hydraulic cement as the main ingredient is prepared to have a long curing time so as not to hinder the injection work. However, when the liquid A alone is injected into the ground, However, when there is water in the ground, it disperses and flows out, and a desired hardened body is not formed, and the stabilization of the ground becomes uncertain. In the chemical solution of the present invention, a curing agent is used in order to shorten the curing time of the solution A and prevent the chemical solution from dispersing and flowing out in water.

The hardener used in the hardener liquid (liquid B) of the chemical liquid of the present invention is selected as follows according to the type of hydraulic cement used in liquid A. Hydraulic cement
Portland cement such the mixed cements, when selected from special cements, the Examples of the curing agent _{3CaO · Al 2 O 3, CaO} · Al 2 O 3, 12Ca
_{O · 7Al 2 O 3, CaO} · 2Al 2 O 3, 11CaO
・ 7Al ₂ O ₃・ CaF ₂ , 3CaO ・ 3Al ₂ O ₃・
Calcium aluminate compounds such as CaSO ₄ and alumina cement; Alkali silicate, silica sol, colloidal silica, silicic acid colloid, destabilized silicic acid, and silicic acid dispersions called activated silicic acid; alkali aluminate, alkali carbonate, silicic acid One or two or more kinds are selected from those generally used as a hardening agent for hydraulic cement, such as acidic alkali silicate obtained by acidifying an alkali with an acid. When the hydraulic cement used in the liquid A is the above calcium aluminate,
As the hardening agent, one or more kinds are selected and used from the above-mentioned Portland cements, mixed cements and special cements.

The amount of the curing agent used in the chemical solution of the present invention is
There is no particular limitation, and the amount of hydraulic cement is set within the range of several seconds to 2 hours. For example, when the curing agent is calcium aluminate, the B liquid 200
The range is 20 to 200 kg, preferably 30 to 160 kg, and more preferably 40 to 140 kg per liter. If the amount of the curing agent per 200 liters of liquid B is less than 20 kg, the curing time of the chemical liquid cannot be set within 2 hours, so that the efficiency of the chemical liquid injection work cannot be improved and the strength of the formed cured body is small. On the other hand, 200
If it exceeds kg, the viscosity of the chemical liquid will increase significantly, so that the mixing of liquid A and liquid B will be insufficient and the chemical liquid will not partially cure, or the permeability will decrease and the consolidation volume will decrease. It is not preferable.

The chemicals of the present invention contain CaO, Ca in order to shorten the curing time of the chemicals and enhance the strength of the cured product.
(OH) ₂ , Na ₂ SO ₄ , K ₂ SO ₄ , gypsum, alkali aluminate, alkali carbonate and the like can be added to the liquid A or the liquid B.

When each of the liquid A or the liquid B prepared as the chemical liquid of the present invention cures in a short time, a curing inhibitor is added to the liquid A or the liquid B to adjust the curing time. As a curing inhibitor, organic acids such as citric acid, tartaric acid, gluconic acid or salts thereof, lignin sulfonic acid, polyol polymers, glucose, sucrose, sorbitol, pentaerythritol, phosphates, polyphosphates, fluorosilicates, etc. Is mentioned.

The purpose of adding the water-soluble polymer to the chemical liquid of the present invention is to: 1) prevent the solid-liquid separation of liquid A / liquid B and mixed liquid AB and to prevent the inside of the transport pipe or injection pipe of liquid A and liquid B. It is to prevent particles from being deposited and clogging, and 2) to reduce the water dispersibility of the drug solution.
By adding the water-soluble polymer to the chemical liquid of the present invention, surprisingly, even when the chemical liquid is injected into water, it cures within a short time without significantly delaying from the intended curing time. As a result, the work of injecting the chemical liquid can proceed smoothly and the construction efficiency can be improved.

Examples of the water-soluble polymer used in the liquid medicine of the present invention include cellulose ethers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxybutyl methyl cellulose, hydroxyethyl ethyl cellulose, and carboxymethyl cellulose; polyacrylamide; Acrylic polymers such as sodium polyacrylate / polyacrylamide-sodium polyacrylate copolymer / polyacrylamide partial hydrolyzate; polyvinyl alcohol, polyethylene oxide, sodium alginate, casein, guar gum and the like can be mentioned. These may be liquid or powder, and one kind or two or more kinds can be used.
Ordinary commercial products can be used as they are, and a cellulose ether type which is easily dissolved in water is preferably used.

Since the water-soluble polymer has different effects of increasing the viscosity of the drug solution depending on its type and degree of polymerization, the amount used in the drug solution of the present invention is preferably based on the following criteria. In the chemical liquid of the present invention, the liquid A / liquid B and the AB mixed chemical liquid do not undergo solid-liquid separation, and when the AB mixed chemical liquid comes into contact with water, the curing time is not significantly delayed. The water-soluble polymer is used in an amount required to give a viscosity that does not significantly reduce the strength of the gel body formed. The viscosity required by the chemical solution of the present invention is 900 to 20,000 cps, preferably 2,000 to 1
The range is 0,000 cps, and more preferably the range of 3,000 to 9,000 cps at which each chemical does not exhibit dispersibility in water.

Even if a water-soluble polymer is added, the viscosity of the drug solution
If it is lower than 900 cps, particles of hydraulic cement and hardener will settle and cause solid-liquid separation, and the AB mixed chemical will disperse in water to increase the curing time of the chemical, resulting in hardening. The strength of the body is greatly reduced. On the other hand, when the viscosity of each chemical liquid added with the water-soluble polymer exceeds 20,000 cps, the mixing property of the chemical liquid is lowered and the mixture is not uniformly mixed.
It is not preferable because the curing time of the mixed chemical liquid and the strength of the cured product formed may vary.

When preparing the chemical liquid-A liquid / B liquid or the AB mixed chemical liquid of the present invention, hydraulic cement, a curing agent, a water-soluble polymer and the like are mixed and dispersed in an aqueous medium. When the viscosity of the chemical liquid is low, the bubbles in the liquid will evaporate and disappear in a short time.However, if the viscosity of the liquid increases due to the water-soluble polymer used, the air from the liquid will be suppressed from escaping and will remain as bubbles. May not disappear over time.

When an antifoaming agent is added to the chemical liquid of the present invention, bubbles in the chemical liquid can be eliminated within a short time. Furthermore,
The strength of a cured product formed from a chemical solution containing an antifoaming agent is
The strength is higher than the strength of the cured body formed by curing the chemical liquid containing bubbles. It is preferable to add an antifoaming agent to the chemical liquid of the present invention, because it is possible to prevent the strength of the cured product to be formed from decreasing and to unexpectedly shorten the curing time of the chemical liquid. Examples of the defoaming agent used in the liquid medicine of the present invention include higher alcohol-based, alkylphenol-based, diethylene glycol-based, dibutyl phthalate-based, water-insoluble alcohol-based, tributyl phosphate-based, polyglycol-based, silicone-based, ethylene oxide-propylene oxide copolymers. Various types such as a polymer type can be used, and one type or two or more types can be used.

The amount of antifoaming agent used in the chemical solution of the present invention is
When preparing the liquid A / liquid B or the AB mixed chemical liquid, the amount may be such that no bubbles are generated in the liquid or the generated bubbles are eliminated within a short time. Usually, the AB mixed chemical liquid is used. It is in the range of 0.04 to 4 kg per 400 liters. If the amount of the defoaming agent is less than 0.04 kg per 400 liters of the AB mixed chemical solution, the defoaming effect cannot be obtained and the strength of the cured product to be formed decreases. Furthermore, the effect of shortening the curing time of the chemical liquid is also reduced. On the other hand, the defoaming effect does not increase so much even if it is used in excess of 4 kg, which is not economical.

In the liquid medicine of the present invention, other additives such as lignin sulfonate or its derivative, oxyorganic acid salt, alkylallyl sulfonate, polyoxyethylene alkyl ether, polyol complex, and higher polyhydric alcohol sulfone are used. A water reducing agent / dispersing agent / high-performance water reducing agent / fluidizing agent as a cement admixture containing an acid salt / melamine formalin condensate sulfonate as a main component can be used.

As one of the modes for preparing the liquid medicine of the present invention, a hydraulic cement or a hardening agent, a water-soluble polymer, and Add a foaming agent and other additives as required, and add the required amount of water and mix, stir and knead. In another embodiment, a hydraulic cement and a water-soluble polymer, or a hydraulic cement and a water-soluble polymer and an antifoaming agent, a hardening agent and a water-soluble polymer, or a hardening agent and a water-soluble polymer and an antifoaming agent are mixed in a predetermined ratio. Alternatively, other additives may be added if necessary, and a required amount of water may be added to mix, stir and knead.

In yet another embodiment, since the water-soluble polymer generally has poor solubility in water, an aqueous solution obtained by previously dissolving it may be used. In addition, powdery substances easily form mamako when they come into contact with water. In order to prevent the formation of mamako, it is preferable to use it in advance by mixing with 0.5 part or more by weight of the water-soluble polymer, the hydraulic cement or the curing agent and the defoaming agent used in the present invention.

When a curing agent that cures in a short time when contacted with water is used, the curing agent liquid is prepared by using water in which the curing inhibitor is appropriately added and dissolved in advance. The mixing time after adding various chemicals is usually about 0.5 to 3 minutes, and at most 10 minutes or less, and a uniform slurry or solution is obtained. The thus-prepared solutions A and B were fed into a Y-shaped tube, a stirrer, and a mixing chamber (in-tube mixer / pipe line mixer) provided in the injection tube and mixed to obtain A. Stabilize the ground by injecting the B mixed chemical solution into the ground and curing it. When injecting the chemical solution of the present invention into the ground, a single pipe, multiple pipes,
Various injection tubes such as a multi-tube type can be used. Also,
Pressure 50-1,000 kg using injection pipe with injection nozzle
It is also possible to inject by injection at / cm ² . Further, the chemical liquid of the present invention can also be used as a backfill material for a concrete structure.

[0032]

EXAMPLES The present invention will be specifically described below with reference to Reference Examples, Comparative Examples and Examples. Table 1 shows the correspondence between each drug used and the symbols shown in Tables 2 to 4 and each drug.

[0033]

[Table 1]

Various chemicals and water were blended in the ratios shown in Tables 2 to 4, and mixed and stirred to prepare solutions A and B, respectively. Regarding the prepared liquid A / liquid B and AB mixed chemical liquid, the conditions such as viscosity, foaming, breathing, dispersibility in water, curing time, and compression strength of the formed cured product are shown in Table 2
Shown in FIG.

Test Method and Judgment; 1) Viscosity: The value at a temperature of 20 ° C. was measured using a B type viscometer. 2) Breathing ... Measuring cylinder (capacity 500ml)
Then, 500 ml of the prepared drug solution was put in the flask and allowed to stand still. After 5 minutes, the presence or absence of breathing was visually judged. The judgment results are shown by the following symbols. ×: Yes; △: Somewhat good; ○: No. 3) Dispersibility in water: graduated cylinder filled with water (capacity
50 ml of the drug solution was poured into 100 ml), and the presence or absence of dispersion of the drug solution was visually determined. The judgment results are shown by the following symbols. ×:
Yes; △: Somewhat good; ○: No. 4) Curing time ... At a temperature of 20 ° C., the liquid A and the liquid B were thoroughly mixed and allowed to stand still, and the time until the contents did not flow out was measured even if the container was tilted. 5) Compressive strength ... 5-1) Cured material in air ... Empty cylindrical container (inner diameter 50 mm, height
200 ml of the AB mixed chemical solution was poured into 150 mm) and cured in air, and the uniaxial compressive strength of the obtained homogel cured product after 1 day was measured. 5-2) Cured product in water: The container in 5-1) was filled with water in advance, and the same measurement as in 5-1) was performed.

[0036]

[Table 2]

The liquid A is shown in Table 2a and the liquid B is shown in Table 2b.
The composition and properties are shown respectively. Reference Examples 1 to 4. Ordinary Portland cement was used as the hydraulic cement, and Table 2a
The viscosity of the slurry A liquid prepared by mixing with water in the amount ratio shown in (5) was 75 to 5,000 cps. In all cases, breathing was observed after 5 minutes of standing. These A
When the liquid was poured into water, all were dispersed and left for 1 day, but did not cure.

Reference Examples 5 to 8. The solution A prepared by adding the water-soluble polymer and the defoaming agent to the solution A of Reference Example 1 had a slight breathing when the viscosity was less than 900 cps.
No breathing was observed at 0 cps and 2,500 cps, but both were dispersed in water and did not cure even after 1 day. (Reference Examples 5 to 7) The liquid A prepared by increasing the amount ratio of the water-soluble polymer and adjusting the viscosity to 6,800 cps did not show breathing or dispersion in water, but the curing time was longer than 2 hours. It was

Reference Examples 9 to 14. Liquid B prepared by using "Electrified ES" containing a typical calcium sulfaluminate compound as a main component as a hardening agent for hydraulic cement and having a composition shown in Table 2b was prepared as follows. Breathing was not observed at a viscosity of 900 cps or higher, and dispersibility in water was not observed at a viscosity of 4,050 cps or higher. However, the viscosity 4,050
Even at cps or higher, the curing time in water was longer than 2 hours.

Table 3 shows the formulations of solutions A and B used in the comparative examples and examples, and the solutions A, B and A obtained.
Table 4 shows the respective properties of the -B mixed chemical solution, the curing time of the AB mixed chemical solution in water, and the strength of the cured product.

[0041]

[Table 3]

[0042]

[Table 4]

Comparative Examples 1 to 4 Liquid A and liquid B prepared by the formulations shown in Table 3 and the properties of a chemical liquid obtained by combining these liquids and having a viscosity of less than 900 cps are shown as comparative examples. As shown in Table 4, A in each of these comparative examples
None of the -B mixed chemicals did not breathe,
Dispersibility in water was observed. The AB mixed chemical solution of Comparative Example 1 was cured in air for 1.5 to 2 hours, and the formed cured product had a compressive strength of 11.3 kg / cm ² . When this chemical solution is poured into water, the curing time becomes 3 to 5 hours, which is 2 to 3 times that in air, and the compressive strength of the cured product formed in water is 3.7 kg / cm. ² and
Compared to that of the cured product formed in the air, it was about 30%, which was a large decrease. The AB mixed chemical liquid of Comparative Example 2 also exhibited substantially the same behavior as that of Comparative Example 1. AB of Comparative Example 3
The mixed drug solution hardened in water within 2 hours, but the compressive strength of the hardened body formed in water was less than 50% as compared with that of the hardened body formed in air, and significantly decreased. . In the AB mixed chemical liquid of Comparative Example 4, the delay in curing time in water was not so large, but the compressive strength of the cured product formed in water was 1% of that of the cured product formed in air.
It did not reach that much, and it fell significantly.

Examples 1 to 3 show the properties of a chemical solution prepared to have a viscosity of 900 cps or more by mixing various hydraulic cements, hardening agents and water-soluble polymers used in the chemical solution of the present invention. As shown in Table 4, no bleeding was observed in each of the liquids A and B and the AB mixed chemical liquid prepared by adding a water-soluble polymer to a viscosity of 900 cps or more. The AB mixed chemical solution does not disperse in water,
Cured in 0-50 minutes. The compressive strength of the cured product formed in water showed a value about the same as or higher than that of the cured product obtained when cured in air.

Examples 4 to 6. Antifoaming agents were added to solutions A and B of Examples 1 to 3, respectively. As shown in Table 4, the foaming of the drug solution could be prevented by adding the defoaming agent. The obtained chemical liquids had a slight decrease in viscosity, but neither did breathing nor disperse in water. And
The compressive strength of the cured product formed in water was greatly increased as was that of the cured product obtained when cured in air. Further, the addition of the defoaming agent surprisingly further shortened the curing time of the AB mixed chemical solution in water.

Examples 7 to 17. Viscosity 900 c obtained by combining various hydraulic cements, hardening agents, water-soluble polymers, defoamers and hardening regulators used in the chemical solution of the present invention.
The properties of the drug solution prepared above ps are shown. As shown in Table 4, a water-soluble polymer was added and the viscosity of each was 900 cps.
No bleeding was observed in any of the solutions A and B and the AB mixed drug solution prepared above. The dispersibility in water was slightly observed with the liquid A having a viscosity of less than 3,000 cps (Examples 7, 8, 12, 13, 16 and 17), but was observed with the liquid B having a viscosity of 900 cps or more. There wasn't. Further, in the AB mixed chemical solution, it was slightly observed at a viscosity of less than 2,000 cps (Examples 7 and 8), but was not observed at a viscosity of more than 3,000 cps. The curing time of the AB mixed chemical in water is about 30 minutes to 2 hours when the viscosity is adjusted to 900 to 2,000 cps (Examples 7 and 8).
In addition, those prepared to have a viscosity of more than 3,000 cps were cured in 2 to 30 minutes (Examples 9 to 17). And, the viscosity is 3,000 cps or more and does not disperse in water.
In the case of the mixed drug solution, the compressive strength of the cured product formed by injecting into water showed a value almost the same as that of the cured product obtained by curing in air. Viscosity 900-2,000
In the range of cps, the compression strength of the cured product formed in water was slightly lowered in the case of the AB mixed chemical liquid which was slightly dispersed in water, but was significantly improved as compared with the case of Comparative Example 1. did.

[0047]

The present invention has the following effects. 1) The chemical liquid of the present invention does not cause solid-liquid separation in any of the liquid A / liquid B and the AB mixed chemical liquid, so that the solid content does not settle in the device that handles the chemical liquid, and clogging trouble can be prevented. it can. Since the volume of the hardened body obtained from the chemical solution of the present invention does not decrease, there is no risk of subsidence due to the formation of a hardened body having a large consolidation volume when injected into the ground. 2) The chemical solution of the present invention can adjust the curing time within a range of about 2 hours even when injected into water,
The efficiency of injection work can be improved. Moreover, the compressive strength of the cured product formed in water is about the same as that of the cured product in air, and a cured product with stable performance can be obtained. 3) The ground stabilization method using the chemical solution of the present invention is less likely to be adversely affected by water in the ground, and can more reliably stabilize the ground.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-1-100045 (JP, A) JP-A-2-293364 (JP, A) JP-A-57-16090 (JP, A) JP-A-53- 135111 (JP, A) JP 62-253687 (JP, A) JP 62-17059 (JP, A) JP 60-65755 (JP, A) JP 49-37426 (JP, A) JP-A-3-161613 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09K 17/00-17/52 C09K 101: 00-109: 00 E02D 3/12

Claims (2)

(57) [Claims] 1. A base liquid containing a hydraulic cement,
A chemical liquid obtained by mixing with a curing agent liquid containing a curing agent, wherein a water-soluble polymer and an antifoaming agent are added to each of the main agent liquid and the curing agent liquid to make each viscosity 900 centipoise or more. A cement-based soil stabilizing chemical solution having a viscosity of 900 centipoise or more, which is obtained by mixing the main agent solution and the hardening agent solution. 2. A ground stabilization method comprising injecting the cement-based soil-stabilizing chemical solution according to claim 1 into the ground for hardening.