JPH11116955A - Injectable liquid chemical composition for soil consolidation and soil stabilization waterproofing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injectable chemical composition for soil consolidation and a method for stopping and improving soil stability containing the same. SOLUTION: The solution is solved by an injectable chemical solution composition for soil consolidation comprising the following solution A and solution B and a soil stability strengthening waterproofing method using the same. Liquid A: An inorganic liquid containing (A) and (B) shown below. (A) Aqueous silicate solution. (B) an anionic surfactant. Liquid B: a mixture of (a) and (b) shown below,
The composition ratio of (a) and (b) is (a) / (b) = 20/8
An organic liquid material using a polyisocyanate having a weight ratio of 0 to 70/30. (A) Diphenylmethane diisocyanate comprising 2,2'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a total of 5 to 60% by weight, and 4,4'-diphenylmethane diisocyanate in a total of 95 to 40% by weight. (B) 3 benzene rings and isocyanate groups in one molecule
Polyphenylene polymethylene polyisocyanate having at least one polyphenylene polymethylene polyisocyanate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injectable chemical composition for soil consolidation and a method for waterproofing a soil using the same. More specifically, the present invention relates to an injectable chemical composition for soil consolidation, which is excellent in compatibility, low-temperature stability, low in viscosity, and less likely to cause soil pollution, and a soil stability strengthening waterproofing method using the same. is there.

[0002]

2. Description of the Related Art As a method of strengthening unstable rock or unstable ground, a chemical solution for stabilizing an inorganic-organic composite soil is used. This chemical solution includes a silicate aqueous solution called water glass, and a polyisocyanate. Is widely used.

In general, polyisocyanates have relatively higher viscosities than silicate aqueous solutions, and in the case of isocyanate group-terminated prepolymers obtained by modifying them with active hydrogen compounds, the viscosities are higher. Further, in a cold season or a cold region, the viscosity during actual use becomes even higher.
In addition, since the silicate aqueous solution and the polyisocyanate composition are each a combination of an inorganic substance and an organic substance, there is a problem of poor compatibility. The expressed strength was not always at a level that could be expected. For this reason,
The miscibility and compatibility between the aqueous silicate solution and the polyisocyanate composition, and the permeability into the rock or the ground have deteriorated, and improvements have been required.

[0004] As this improvement method, for example, Patent No. 2
No. 5,915,540, Japanese Patent Publication No. 7-72271, Japanese Patent Publication No. 62-21039, etc., and the contents of each publication are as follows.・ Japanese Patent No. 2591540 discloses that (A) a solid content concentration of 10
-70% by weight aqueous sodium silicate solution, and (B)
(A) Polyisocyanate does not react with (b) polyisocyanate component, but it is alkali-hydrolyzed by sodium silicate aqueous solution component and is used for tunnel excavation consisting of a polyisocyanate composition comprising a reactive diluent which is a reactive ester or ether. An injectable chemical composition for stabilizing rock or ground is disclosed. Japanese Patent Publication No. 7-72271 discloses (A) an aqueous solution of sodium silicate, and (B) (A) a polyoxyalkylene mono- or polyol having 5% by weight or more of oxyethylene chains in an oxyalkylene chain and (B) B) An injectable chemical composition for stabilizing an earth or artificial structure made of a hydrophilic urethane prepolymer containing a free isocyanate group obtained by reacting an organic polyisoanate is disclosed. There is a statement that the aforementioned reactive diluent may be used. Japanese Patent Publication No. Sho 62-21039 discloses (a) a main agent in which an inert diluent is blended with a hydrophilic urethane prepolymer having a terminal isocyanate group alone or a hydrophilic urethane prepolymer having a terminal isocyanate group, and (b) A ground stabilization method using a dilute silicate aqueous solution is described.

[0005] Further, in each of the publications, diesters of monobasic polyhydric alcohols and diesters of low-molecular-weight dibasic acids are used for the purpose of improving permeability into rocks and ground by lowering the viscosity and improving storage stability. Reactive diluents such as acetates and alkylene carbonates; plasticizers such as chlorinated paraffin, dioctyl phthalate, dibutyl phthalate, and dioctyl adipate; and non-reactive agents such as methyl ethyl ketone, toluene, xylene, and 1,1,1-trichloroethane. It is described that an active diluent (a diluent that does not contain an active hydrogen compound in the molecule) and the like can be used in combination. In Examples, a reactive diluent, a plasticizer, an inert diluent, and the like are used. ing.

[0006] The above-mentioned reactive diluent is disclosed in Japanese Patent No.
It has been shown that alkali hydrolysis is carried out by an alkali component of an aqueous silicate solution as described in JP 91540,
For example, ethylene glycol diacetate is said to hydrolyze to form ethylene glycol and acetic acid and react with isocyanate.

[0007] Mixing these diluents and plasticizers has the effect of lowering the viscosity of the injection liquid and the effect of preventing solidification, so that workability is improved (especially in the field construction in cold regions. (Avoidance of increase in viscosity and solidification) and improvement of the mixing property at the time of mixing the liquid, and further, as described in Japanese Patent No. 2591540, the curability is improved by the reaction between the decomposition product and the polyisocyanate, and the strength is improved. It has been commonly used in this field because of its expected effects. In some cases, a flame retardant may be used in order to obtain all of the above effects and the flame retardant effect at once.

In general, non-reactive additives such as a flame retardant and a plasticizer are generally slightly exuded outside the resin after being taken into the resin. It is not preferable for the purpose of stabilizing the soil. Further, even with a reactive diluent, there is a possibility that unreacted substances may exude over time.

On the other hand, the injection chemical for urethane-based rock or ground consolidation is managed in accordance with the "Guidelines on Safety Management of Urethane Injection in Mountain Tunneling Method" (October 1992; issued by Japan Highway Public Corporation). It is assumed. One of the management items is water quality control of groundwater, and an injection chemical that does not contaminate groundwater is required. The indicators of water pollution in groundwater in these guidelines include potassium permanganate consumption (hereinafter COD
Expressed as a value. As the COD value increases, the water pollution increases. ) Is used and C of urethane infusion
The OD value is required to be 10 mg / L or less.

However, the alkylene carbonate used as a reactive diluent decomposes and penetrates into the soil, causing an increase in the COD value as an index of water pollution of groundwater. For example, the COD value of propylene carbonate is 83,9
00 mg / L. COD of a foam of a certain urethane-based injection chemical solution using an alkylene carbonate
The value is 308 mg / L, far exceeding the upper limit (10 mg / L) of the COD value in the above-mentioned guideline.

As described above, unless these diluents and plasticizers are used, the viscosity of the injected chemical liquid inevitably increases and the solidification at a low temperature occurs, making it difficult to put it into practical use. On the other hand, those using a diluent, a plasticizer or the like have difficulty in achieving environmental protection standards. As described above, it has been difficult to achieve both the practical advantage and the environmental protection with the conventional injection chemical for soil consolidation.

[0012]

The inventors of the present invention have sought to develop an injection chemical composition for soil consolidation that does not use the above-mentioned diluents, plasticizers, flame retardants, etc. from the viewpoint of environmental protection. Intensive research is being conducted on possible measures to solve the problems that existed in conventional products, such as a decrease in workability due to an increase in viscosity or solidification of the injectable chemical composition during the low temperature period, and poor mixing due to insufficient compatibility. As a result, the above-mentioned problems, especially the silicate aqueous solution, were obtained by using an injectable chemical composition composed of an A solution containing a silicate aqueous solution and an anionic surfactant, and a B solution containing a polyisocyanate having a specific composition. It has been found that a drastic improvement in the compatibility between water and polyisocyanate can be achieved, and the present invention has been achieved.

[0013]

That is, the present invention provides the following (1) to (5). (1) An injectable chemical composition for soil consolidation comprising the following liquid A and liquid B. Liquid A: An inorganic liquid containing (A) and (B) shown below. (A) Aqueous silicate solution. (B) an anionic surfactant. Liquid B: a mixture of (a) and (b) shown below,
The composition ratio of (a) and (b) is (a) / (b) = 20/8
An organic liquid containing a polyisocyanate in an amount of 0 to 70/30 (weight ratio). (A) Diphenylmethane diisocyanate comprising 2,2'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a total of 5 to 60% by weight, and 4,4'-diphenylmethane diisocyanate in a total of 95 to 40% by weight. (B) 3 benzene rings and isocyanate groups in one molecule
Polyphenylene polymethylene polyisocyanate having at least one polyphenylene polymethylene polyisocyanate.

(2) An injectable chemical composition for solidifying soil, comprising the following liquid A and liquid B: Liquid A: An inorganic liquid containing (A) and (B) shown below. (A) Aqueous silicate solution. (B) an anionic surfactant. Liquid B: isocyanate group-terminated prepolymer obtained by reacting the following (a) to (c), and the composition ratio of (a) and (b) is (a) / (b) = 20 / 80- 70/30
An organic liquid containing an isocyanate group-terminated prepolymer obtained by reacting (c) with a polyisocyanate (weight ratio). (A) Diphenylmethane diisocyanate comprising 2,2'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a total of 5 to 60% by weight, and 4,4'-diphenylmethane diisocyanate in a total of 95 to 40% by weight. (B) 3 benzene rings and isocyanate groups in one molecule
Polyphenylene polymethylene polyisocyanate having at least one polyphenylene polymethylene polyisocyanate. (C) The number average molecular weight is 200 to 5,000, and the ethylene oxide unit is 60 to 100% by weight.
Containing hydroxyl group-containing polyether.

(3) An injectable chemical composition for soil consolidation obtained by adding (C) an active hydrogen compound to the solution A in the injectable chemical composition for soil consolidation according to (1) or (2).

(4) The solution A in the infusion chemical composition for solidifying soil according to any one of the above (1) to (3),
An injection chemical composition for soil consolidation to which an amine catalyst has been added.

(5) The injection liquid chemical composition for solidifying soil according to any one of the above (1) to (4) is injected and solidified from an injection hole provided at a predetermined location in the soil in advance. Water stabilization method to enhance soil stability.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
First, an injection liquid composition for soil consolidation will be described. The present invention comprises (A) an aqueous silicate solution, (B) an A liquid which is an inorganic liquid containing an anionic surfactant, and a B liquid containing a polyisocyanate. Immediately after being blended, this blended liquid is injected into a bedrock or ground, and is a chemical solution composition that is foamed and formed into a resin, and is effective in stopping and strengthening soil.

The aqueous solution of silicate (A) used in the present invention is preferably an aqueous solution containing 20 to 40% by weight of silicon dioxide and 5 to 20% by weight of sodium oxide, and more preferably 21 to 36% by weight of silicon dioxide. Aqueous silicate solutions containing 8 to 17% by weight of sodium oxide are preferred. The molar ratio of sodium oxide to silicon dioxide in the aqueous silicate solution is sodium oxide: silicon dioxide = 2: 1: 1-4. The solid content of the silicate aqueous solution is 10 to 70% by weight,
Preferably it is 20 to 50% by weight. If the solid content of a commercially available silicate aqueous solution is too high, it may be diluted with water. Specific products include No. 1 sodium silicate S2, 2
No. 2 sodium silicate Q5, No. 2 sodium silicate T2, and No. 2 sodium silicate T8 (manufactured by Tosoh Sangyo Co., Ltd.).

In the present invention, (B) an anionic surfactant is blended with the solution A in order to improve the compatibility between the solution A and the solution B. By using (B) an anionic surfactant as a compatibilizer, the compatibility between the two is further improved.
As a result, there is no inconvenience at the time of work such as shaking the container before use at the actual construction site, stirring in a tank, and further performing on-site construction using a mixing device such as a static mixer. A uniform foam can be obtained by improving the compatibility of the above, and stable strength can be exhibited.

In the present invention, the (B) anionic surfactant is preferably one of a sulfonate surfactant, a sulfate ester surfactant and an acidic phosphate ester surfactant. Is selected above,
Particularly preferred are those having a pH of 6 to 10, and more preferred are sulfonate-based surfactants. The sulfonate surfactant and the sulfate ester surfactant are usually supplied in the form of an aqueous solution, and the acidic phosphate ester surfactant has a solid content of 100%.
Supplied in state.

The sulfonate-based surfactants used in the present invention include those represented by the following formulas 1 to 11 and ammonium salts, alkali metal salts, alkaline earth metal salts of naphthalenesulfonic acid formalin condensate, Organic quaternary ammonium salts and the like can be mentioned.

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[0023]

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[0024]

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[0025]

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[0026]

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[0027]

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[0028]

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[0029]

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[0030]

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[0031]

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[0032]

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Examples of the sulfate ester-based surfactant include those represented by the following formulas (12) to (14).

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[0034]

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[0035]

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Examples of the acidic phosphoric acid ester surfactant include those represented by the following formulas (15) to (20).

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[0037]

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[0038]

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[0039]

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[0040]

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[0041]

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The most preferred of these anionic surfactants are those represented by Formulas 2 and 7.

(B) The amount of the anionic surfactant added is
0.05- in terms of solid content with respect to the silicate aqueous solution (A)
If the amount is less than 1.5% by weight, the compatibility between the aqueous silicate solution and the polyisocyanate composition tends to be poor. If the amount is more than 1.5% by weight, the strength and the expansion ratio are adversely affected.

In the present invention, the solution A (C) will be described later.
The use of an active hydrogen group-containing compound or an amine catalyst (D) is preferable in terms of strength and workability.

The active hydrogen group compound (C) used in the present invention includes low molecular weight alcohols, low molecular weight amines, low molecular weight amino alcohols, low molecular weight glycol ethers, polyester polyols, polyether polyols, polycarbonate polyols And the like. These can be used alone or in combination of two or more.

Examples of the low molecular alcohols include methyl alcohol, ethyl alcohol, n-propyl alcohol, n-butyl alcohol, n-amyl alcohol, n-hexyl alcohol, n-heptyl alcohol, n-octyl alcohol, and n-octyl alcohol. Nonyl alcohol,
n-decyl alcohol, n-lauryl alcohol, n-
Tridecyl alcohol, n-tetradecyl alcohol,
n-pentadecyl alcohol, n-heptadecyl alcohol, n-octadecyl alcohol (stearyl alcohol), isopropyl alcohol, isobutyl alcohol, 2-ethylhexanol, methyl-1-nonanol, dimethyl-1-octanol, tetramethyl-1-
Hexanol, 3-ethyl-4,5,6-trimethyloctanol, 4,5,6,7-tetramethylnonanol, tridecanol, tetradecanol, 2-hexyldecanol, 2-hexadecyloctanol, cyclohexanol, cyclohexane Methanol, ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6 -Hexanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2,2
-Diethyl-1,3-propanediol, 2-n-butyl-2-ethyl-1,3-propanediol, 2,2,
Single product such as 4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, glycerin, trimethylolpropane, pentaerythritol or 2
Mixtures of more than one species.

Examples of the low molecular amines include ethylamine, butylamine, diethylamine, dibutylamine, aniline, N-methylaniline, diphenylamine, ethylenediamine, propylenediamine, diethylenetriamine, toluenediamine, metaphenylenediamine, diphenylmethanediamine, and xylylenediamine. And the like, or a mixture of two or more.

Examples of the low molecular weight amino alcohols include monoethanolamine, diethanolamine, N- (β-aminoethyl) ethanolamine and the like, or a mixture of two or more thereof.

Examples of low molecular weight glycol ethers include ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, and ethylene glycol mono-2. A single product or a mixture of two or more glycol ethers such as ethylhexyl ether, propylene glycol monomethyl ether, and dipropylene glycol monomethyl ether.

The polyester polyols include those having two or more active hydrogen groups in one molecule among the above-mentioned low molecular alcohols, low molecular amines and low molecular amino alcohols, succinic acid, adipic acid, sebacine and the like. Polycarboxylic acids such as acids, azelaic acid, terephthalic acid, isophthalic acid, orthophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, hexahydroorthophthalic acid, naphthalenedicarboxylic acid, trimellitic acid, and hexahydrotrimellitic acid, acids Examples include polyester polyols and polyester amide polyols obtained by a dehydration condensation reaction with one or more kinds of esters or acid anhydrides. Lactone-based polyester polyols obtained by ring-opening polymerization of cyclic ester (lactone) monomers such as ε-caprolactone, γ-butyrolactone and the like are also included.

The polycarbonate polyol is obtained by a dealcoholation reaction between the above-mentioned alcohols having two or more active hydrogen groups in one molecule and diethylene carbonate, dimethyl carbonate, diethyl carbonate, diphenyl carbonate or the like. Things.

Examples of polyether polyols include ethylene oxide (hereinafter abbreviated as EO), propylene oxide (hereinafter abbreviated as PO), butylene oxide, and amylene, using the above-mentioned alcohols, amines and amino alcohols as initiators. It can be obtained by addition-polymerizing an alkylene oxide such as an oxide, an alkyl glycidyl ether such as a methyl glycidyl ether, an aryl glycidyl ether such as a phenyl glycidyl ether, or a cyclic ether monomer such as tetrahydrofuran or a mixture thereof by a known method.

The number average molecular weight of the active hydrogen group-containing compound (C) in the present invention is preferably from 62 to 5,000, more preferably from 500 to 4,000. The average number of functional groups is preferably from 1 to 5, and more preferably from 2 to 4. In addition, among the aforementioned active hydrogen group-containing compounds, the hydroxyl group-containing polyether is considered to be the viscosity, stability, reactivity (foamability) at the time of blending, the strength of the foam formed after blending, etc. Preferably, polypropylene glycol is particularly preferred. Further, the compounding amount of (C) is preferably (A) aqueous silicate solution / (C) active hydrogen group-containing compound = 100/5 to 100/30 (weight ratio).

As the (D) amine catalyst used in the present invention, those generally used in the urethane industry can be used. For example, compounds represented by the formulas 21 to 34,
8-diazabicyclo [5.4.0] undenecene-7
(DBU) and the like.

[0055]

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[0056]

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[0057]

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[0058]

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[0059]

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[0060]

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[0061]

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[0062]

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[0063]

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[0064]

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[0065]

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[0066]

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[0067]

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[0068]

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The preferred (D) amine catalyst in the present invention is a tertiary amine compound having an active hydrogen group, and more preferably a tertiary amine compound represented by Formulas 22 to 24 and 27. . The reason for this is that the amine catalyst itself reacts with the isocyanate and is bound into the resin, so that the possibility of exuding over time is small, and soil contamination is unlikely to occur. (D)
Is preferably (A) aqueous silicate solution / (D) amine catalyst = 100 / 0.5 to 100/5 (weight ratio).

Metal catalysts such as dibutyltin dilaurate, dioctyltin dilaurate, calcium naphthenate, tin octylate and zinc octylate among the catalysts used for the purpose of adjusting the reactivity are also bound in the resin. It is not preferable because there is no risk of soil contamination.

As the polyisocyanate used in the liquid B of the present invention, (a) diphenylmethane diisocyanate having two benzene rings and two isocyanate groups in one molecule (hereinafter referred to as (a) MDI), and (b) polyphenylenepolymethylene polyisocyanate having three or more benzene rings and isocyanate groups in one molecule (hereinafter abbreviated as polymeric MDI) as main components. Further, (a) MDI is 2,2'-diphenylmethane diisocyanate (hereinafter abbreviated as 2,2'-MDI) and 2,4'-diphenylmethane diisocyanate (hereinafter abbreviated as 2,4'-MDI). ), 4,4 '
-Diphenylmethane diisocyanate (hereinafter 4,4 ')
-Abbreviated as MDI. ) Of the three isomers must be 4,
It is a mixture of two or more isomers containing 4'-MDI.

In the present invention, the composition ratio of (a) MDI and (b) polymeric MDI is (a) :( b) = 20 to
70: 80-30, preferably 25-65: 75-3
5 (weight ratio). If (a) is less than this range, it is difficult to reduce the viscosity of the liquid B. In addition, when the amount is large, the influence of solidification (crystallization) of MDI at low temperature of MDI itself becomes strong, and liquid B is easily solidified.

Further, in the above-mentioned (a) MDI,
The composition ratio of the sum of 2'-MDI and 2,4'-MDI (hereinafter abbreviated as isomer total) and 4,4'-MDI is 5-60: 95-40, preferably 10-55: 9.
5 to 40 (% by weight). When the content ratio of the total isomers is 5% by weight or less, the influence of solidification (crystallization) of MDI at a low temperature becomes strong, and the whole liquid B is easily solidified. In the case of 60% by weight or more, 4,4′-
Since 2,2'-MDI and 2,4'-MDI are more flexible in molecular structure than MDI, they are less likely to exhibit strength and are likely to be unsuitable as an injection liquid for soil consolidation.

In the present invention, an isocyanate group (hereinafter abbreviated as NCO group) obtained by modifying the mixture of (a) and (b) described above with (c) a hydroxyl group-containing polyether.
The terminal prepolymer can be used as a main component of the liquid B.

The hydroxyl group-containing polyether has a number average molecular weight of 200 to 5,000, preferably 300 to 4.5.
00 and contains 60 to 100% by weight, preferably 65 to 100% by weight of an EO unit in order to impart hydrophilicity to the polyisocyanate. When the number average molecular weight is less than 200, the urethane group concentration increases and the strength is developed, but since the urethane group is liable to hydrogen bond, the whole liquid B is easily solidified at a low temperature. On the other hand, when the number average molecular weight exceeds 5,000,
Conversely, the urethane group concentration is low, and the strength is insufficient, so that it tends to be unsuitable as an injection liquid for soil consolidation. If the content of the EO unit is lower than 60% by weight, the miscibility with the silicate aqueous solution will be poor. The hydroxyl group-containing polyether may be any as long as it satisfies this condition as a whole, and may have any shape such as polyethylene glycol alone, a mixture of polyethylene glycol and polypropylene glycol, and an EO and PO copolymer. Polyethylene glycol alone or EO and PO copolymer. The average number of functional groups of the hydroxyl group-containing polyether is 1 to 5
Is preferable, and 1-3 are more preferable.

The ratio of the mixture of (a) and (b) to (c) in the production of the NCO group-terminated prepolymer is such that the molar ratio of NCO groups to hydroxyl groups at the time of preparation is NCO group / hydroxyl groups = 5 to 500. , Preferably 10 to 300. When the NCO group / hydroxyl group is less than 5, the viscosity of the solution B becomes too high, and the workability is reduced. On the other hand, if it exceeds 500, it is difficult to obtain a modifying effect.

If the amount is small, the polyisocyanate may be 4,4'-diphenyl ether diisocyanate, 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenylpropane-4,4'-diisocyanate. 3,3'-dimethyldiphenylmethane-
4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate,
Aromatic diisocyanates such as 4-phenylene diisocyanate, 1,4-naphthalene diisocyanate, 1,5-naphthalene diisocyanate, 3,3'-dimethoxydiphenyl-4,4'-diisocyanate, 1,6-hexamethylene diisocyanate, 1,4 -Aliphatic methylene diisocyanate such as tetramethylene diisocyanate, lysine diisocyanate, o-xylene diisocyanate,
Alicyclic aliphatic isocyanates such as m-xylene diisocyanate, p-xylene diisocyanate, tetramethyl xylene diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and alicyclics such as hydrogenated tetramethyl xylene diisocyanate Diisocyanates and so-called modified polyisocyanates such as adduct-modified, burette-modified, isocyanurate-modified, uretonimine-modified, uretdione-modified and carbodiimide-modified organic diisocyanates can also be used. These isocyanates can be used alone or in a mixture of two or more.

The isocyanate content of the polyisocyanate used in the present invention (hereinafter abbreviated as NCO content)
Is 23 to 33% by weight, preferably 25 to 33% by weight. Further, the viscosity is preferably from 30 to 300 mPa · s / 25 ° C, more preferably from 35 to 280 mPa · s / 25 ° C.

In the present invention, the mixing ratio of the liquid A and the liquid B is
It is preferable to use the liquid A / liquid B / = 0.7 to 1.3 in a weight ratio. Outside this range, the strength tends to be insufficient.

In the present invention, if necessary, surfactants and catalysts other than those described above, other pigments, dyes, fillers, gelling inhibitors, coupling agents, foaming agents, dispersants, thickeners, oxidizing agents Various additives such as an inhibitor, an ultraviolet absorber and a heat resistance imparting agent can be added, but they should be limited to those that do not cause soil contamination.

Next, a description will be given of a soil stabilization waterproofing method using an injection chemical composition for soil consolidation. The injection liquid composition for soil consolidation of the present invention described so far has foaming properties, and also has good characteristics of both inorganic and organic materials. The injection liquid composition for soil consolidation of the present invention has a lower viscosity than the conventional one, and the compatibility between the liquid A and the liquid B is dramatically improved. For this reason, the soft or unstable ground with many voids and cracks, the bedrock, used for the stabilization and waterproofing of the crushed zone, etc., the soil stability strengthening waterproofing method of the present invention is not particularly limited, and known methods are Either can be adopted.

For example, the injection amount of each of the solution A and the solution B,
Each is put into a separate tank using a proportional compounding pump capable of controlling the pressure, the compounding ratio and the like. An injection hole is provided at a predetermined location (for example, a plurality of holes drilled at predetermined intervals) on a bedrock or the like, and a perforated lock bolt, injection rod, or the like containing a static mixer, a check valve, and the like fixed in advance. , Each component in the tank is injected under pressure, and a predetermined amount of each component is uniformly mixed using a static mixer. In this way, it is possible to infiltrate and infiltrate into predetermined soil such as unstable rock or ground, and to harden it by solidifying it.

Further, in the case of injecting into the roof of the tunnel, prior to the injection, holes are drilled at predetermined intervals using a leg auger or the like, and injection holes having a predetermined depth and a drilling angle are provided. A static mixer and a lock bolt are inserted into the injection hole. Then, the mouth of the lock bolt is sealed using a waste or the like impregnated with quick-setting cement or a foamed hard polyurethane resin in order to prevent a backflow of the injected chemical solution, and the composition is injected in the same manner as described above. You can also.

[0084]

As explained above, the infusion chemical composition for soil consolidation of the present invention is an improvement on the disadvantages of the conventionally known inorganic-organic composite infusion chemical composition for soil consolidation. is there. That is, the injectable chemical composition for consolidation of the present invention has low viscosity and low-temperature stability without using a diluent, a plasticizer, a flame retardant, a catalyst, or the like, which easily causes soil contamination or (groundwater) water pollution. Can be achieved, and furthermore, the compatibility between the solution A and the solution B is remarkably improved, so that a uniform foam can be obtained and a stable reinforced soil can be developed. Therefore, the workability of the on-site construction in a cold season or a cold region is improved, and the soft or unstable ground having many voids and cracks, the bedrock, the excellent permeability and filling property to the soil such as the crushed zone. A foamable resin can be obtained. Further, by the soil stabilization method of soil stability strengthening water stoppage method using the injectable chemical composition for consolidation of the present invention, mountain tunnels, seabed tunnels, tunnel excavation works such as large section tunnels, deep underground civil works, etc. The rock or ground can be stably and reliably stopped over a wide area with high strength.

[0085]

EXAMPLES Examples of the present invention will be described below in detail, but the present invention is not limited to these examples. Unless otherwise specified, "parts" in Examples and Comparative Examples
And "%" represent "parts by weight" and "% by weight", respectively.

[Preparation of Solution B] Synthesis Examples 1 to 14 Polyisocyanates A to D, I, J, and N used for Solution B
A liquid B was prepared by using NCO-1 to NCO-4 and NCO-6 to 10 individually or by mixing them. In addition, polyisocyanate E
To H and K to M are NCO-3, 4, 7, and 8 alone or in combination with OH-1 to OH-7 in the combination shown in Tables 1 and 2.
The mixture was reacted at a temperature of 3 ° C. for 3 hours to synthesize an NCO group-terminated prepolymer. Polyisocyanate A to N
Tables 1 and 2 show the types, amounts, analytical values, and low-temperature stability of the raw materials used in Example 1.

[0087]

[Table 1]

[0088]

[Table 2]

In Synthesis Examples 1 to 14 and Tables 1 and 2, the raw materials are as follows. NCO-1: MDI / polymeric MDI = 100/0 (weight ratio) Content ratio of total isomers in MDI = 50% NCO content = 33.5% NCO-2: MDI / polymeric MDI = 50/50 (weight ratio) Content ratio of total isomers in MDI = 10% NCO content = 31.3% NCO-3: MDI / polymeric MDI = 100/0 (weight ratio) Content ratio of total isomers in MDI = 28% NCO content = 33. 6% NCO-4: MDI / polymeric MDI = 36/64 (weight ratio) Content ratio of total isomer in MDI = 17% NCO content = 31.3% NCO-5: MDI / polymeric MDI = 30/70 (weight) Ratio) Content ratio of total isomers in MDI = 50% NCO content = 31.1% NCO-6: MDI / polymeric DI = 100/0 (weight ratio) Total content of isomers in MDI = 100% NCO content = 33.4% NCO-7: MDI / polymeric MDI = 100/0 (weight ratio) Total isomer content in MDI Ratio = 0% NCO content = 33.7% NCO-8: MDI / polymeric MDI = 42/58 (weight ratio) Total content of isomers in MDI = 0% NCO content = 31.1% NCO-9: MDI / Polymeric MDI = 10/90 (weight ratio) Total content of isomers in MDI = 30% NCO content = 28.7% OH-1: number average molecular weight = 400, average number of functional groups = 2 EO unit = 100 mol% OH-2: number average molecular weight = 3,000, average number of functional groups = 3 EO unit = 80 mol% OH-3: number average molecular weight = 4,000, average Number of functional groups = 2 EO units = 80 mol% OH-4: Number average molecular weight = 2,000, average number of functional groups = 1 EO unit = 65 mol% OH-5: Number average molecular weight = 400, average number of functional groups = 2 EO units OH-6: number average molecular weight = 3,000, average number of functional groups = 3 EO units = 30 mol% OH-7: number average molecular weight = 4,000, average number of functional groups = 2 EO units = 0 mol% In addition, the low-temperature stability is that the solution B is stored at −10 ° C. for one month,
The appearance was checked. Good: Uniform state without solidification, precipitation, etc. Poor: solidified, precipitated, etc., and is in an uneven state.

[Preparation of Liquid A] Synthesis Examples 15 to 21 Liquid A was prepared with the raw materials and the mixing ratios shown in Table 3.

[0091]

[Table 3]

In Synthesis Examples 15 to 21 and Table 3, the starting materials are as follows. Aqueous silicate solution: No. 1 sodium silicate S2 (manufactured by Tosoh Sangyo) SURF-1: Aqueous solution of ammonium salt of dodecylbenzenesulfonic acid (trade name Newcol 210: manufactured by Nippon Emulsifier) Aqueous solution of sodium salt of disulfonic acid (trade name Newcol 271-A: manufactured by Nippon Emulsifier) Solid content = 47% Amine catalyst: N, N, N'-trimethylaminoethyl-ethanolamine OH-8: Number average molecular weight = 3000, initiator = diamine EO unit / PO unit = 40/60 (weight ratio) polyether polyol OH-9: number average molecular weight = 1000, initiator = diol EO unit / PO unit = 0/100 (weight ratio) Polyether polyol

[Expansion Test, Measurement of Physical Properties of Foam] Examples 1 to 8 and Comparative Examples 1 to 6 After combining the liquids A and B in the combinations and mixing ratios shown in Tables 4 and 5, 600 rpm / 10 seconds ( 20 ° C.) under the condition of mixing and foaming, with regard to the reaction behavior and the physical properties of the foam,
The following items were tested. The results are shown in Tables 4 and 5.

Regarding Comparative Examples 5 and 6 shown in Table 5, the viscosity was too high to use the polyisocyanates M and N directly as the B liquid, and thus the polyisocyanates M and N diluted with propylene carbonate were used as the B liquids. Used as The mixing ratio of polyisocyanate and propylene carbonate and the viscosity of the diluted product are as follows. Polyisocyanate M / propylene carbonate = 85 / 9.4 (weight ratio) Viscosity of diluted polyisocyanate M: 110 mPa · s / 25 ° C. Polyisocyanate N / propylene carbonate = 85 / 21.3 (weight ratio) of diluted polyisocyanate N Viscosity: 120 mPa · s / 25 ° C

[0095]

[Table 4]

[0096]

[Table 5]

[Method of Testing Physical Properties of Foam] (1) Foaming Speed and Foaming Ratio Cream Time The time from the start of mixing the liquid A and the liquid B to the time when the compound liquid becomes cloudy and rises up. . Rise time Indicates the time from the start of mixing the liquid A and the liquid B to the time when the compounded liquid foams and reaches the highest height. The expansion ratio is calculated by the following equation. Expansion ratio (times) = volume of foam after foaming (cc) / volume of blended liquid before foaming (cc) (2) Uniaxial compressive strength JSF T511 (conforms to the uniaxial compression test method for soil specified by the Japan Society of Soil Engineering) It went according to. (3) Mixability and compatibility of the blended liquid The obtained foam was subjected to a JIS K-7222 according to JIS K-7222.
Five or more test pieces were taken out of the foam of at least ml and the density was measured. ：: All the measured density values are within ± 10% of the simple average value. X: There are density measurement values that are not within the range of ± 10% of the simple average value. (4) Soil and water pollution Potassium permanganate (KMnO ₄ ) consumption (COD)
Value) The measurement was performed in accordance with the item 17 of JIS K-0102 (Factory drainage test method).

[0098] In Examples 1 to 8 in Table 4, it is considered that the distribution of the density of the foam did not vary, and the mixed liquid was in a uniform state, that is, the compatibility between the liquid A and the liquid B was good. On the other hand, the same test was performed on Comparative Examples 1 to 6 described in Table 5, and as a result, the density distribution of the foams varied, so that the mixed liquid was in a non-uniform state, that is, the phase of the liquid A and the liquid B It is considered that the solubility was not good. As shown in Table 5, the COD values of Comparative Examples 5 and 6 were particularly high, resulting in a large possibility of causing soil contamination. When the various data in Tables 4 and 5 are comprehensively considered, the examples of the present invention had properties equivalent to or higher than those of the comparative examples with respect to the foaming speed, the expansion ratio, and the compressive strength.
Compatibility has no problem in all examples, and COD values are clear at 10 mg / L or less specified in the guidelines in all examples. Therefore, it can be said that there is no problem with water pollution.

Example 9 A hole drilling angle of 25 to 35 ° was applied to a roof of a tunnel having a crushing zone at intervals of 2 m using a 42 mmφ bit leg auger.
(Angle with respect to the tunnel excavation direction) 5 holes were drilled, and carbon steel injection bolts (outer diameter 27.2 mm, inner diameter 1
5 mm, length 3 m, built-in static mixer and check valve), and a 30-cm mouth portion of a knitted cloth impregnated with a two-component hard foamed polyurethane resin was pressed and sealed with an iron bar. Then, in each of the fixed injection holes, the injection liquid composition for soil consolidation prepared in Example 7 was injected at an injection pressure of 20 to 50.
kg-f / cm ² , and 80 to 120 kg per hole were injected.
When the state of the tunnel ground was examined by excavation 50 minutes after the injection, the ground was hemispherical with a radius of 5 m centered on the surface holes and was stabilized and solidified. Not confirmed. The liquid injection solidified part was sampled into a 5 cmφ × 10 cm cylindrical shape with a sampler, and the uniaxial compressive strength was measured.
/ Cm ² . The unimproved part could not be sampled because of the crush zone.

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[Procedure amendment]

[Submission date] December 5, 1997

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Injectable medicinal liquid composition for soil consolidation and soil stabilization waterproofing method using the same

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // C09K 103: 00

Claims (5)

[Claims] 1. An injectable chemical composition for soil consolidation comprising a liquid A and a liquid B shown below. Liquid A: An inorganic liquid containing (A) and (B) shown below. (A) Aqueous silicate solution. (B) an anionic surfactant. Liquid B: a mixture of (a) and (b) shown below,
The composition ratio of (a) and (b) is (a) / (b) = 20/8
An organic liquid containing a polyisocyanate in an amount of 0 to 70/30 (weight ratio). (A) Diphenylmethane diisocyanate comprising 2,2'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a total of 5 to 60% by weight, and 4,4'-diphenylmethane diisocyanate in a total of 95 to 40% by weight. (B) 3 benzene rings and isocyanate groups in one molecule
Polyphenylene polymethylene polyisocyanate having at least one polyphenylene polymethylene polyisocyanate. 2. An injectable chemical composition for solidifying soil comprising the following liquids A and B: Liquid A: An inorganic liquid containing (A) and (B) shown below. (A) Aqueous silicate solution. (B) an anionic surfactant. Liquid B: isocyanate group-terminated prepolymer obtained by reacting the following (a) to (c), and the composition ratio of (a) and (b) is (a) / (b) = 20 / 80- 70/30
An organic liquid containing an isocyanate group-terminated prepolymer obtained by reacting (c) with a polyisocyanate (weight ratio). (A) Diphenylmethane diisocyanate comprising 2,2'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in a total of 5 to 60% by weight, and 4,4'-diphenylmethane diisocyanate in a total of 95 to 40% by weight. (B) 3 benzene rings and isocyanate groups in one molecule
Polyphenylene polymethylene polyisocyanate having at least one polyphenylene polymethylene polyisocyanate. (C) The number average molecular weight is 200 to 5,000, and the ethylene oxide unit is 60 to 100% by weight.
Containing hydroxyl group-containing polyether. 3. An infusion chemical composition for soil consolidation, wherein (C) an active hydrogen compound is added to the solution A in the infusion chemical composition for soil consolidation according to claim 1 or 2. 4. An injection liquid composition for soil consolidation, wherein (D) an amine catalyst is added to the liquid A in the injection liquid composition for soil consolidation according to any one of claims 1 to 3. 5. A soil stabilizing method, comprising injecting and solidifying the injectable chemical composition for soil consolidation according to any one of claims 1 to 4 from an injection hole provided at a predetermined location in the soil in advance. Reinforced waterproofing method.