JP2019210721A - Excavation method and excavation stabilizing liquid - Google Patents

Abstract

To provide an excavation method and excavation stabilizing liquid that can suppress the water loss that occurs in the permeable ground that causes collapse in an excavation hole when excavating the ground in an embedded concrete pile embedding method or the like.SOLUTION: In an excavation method, the ground is excavated using an excavation stabilizing liquid containing (A) a rheology modifier, (B) water-swellable clay, hydraulic property powder, and water while preventing the collapse of an inner wall surface of an excavation hole.SELECTED DRAWING: None

Description

  The present invention relates to a drilling stabilization liquid used for preventing collapse in a drilling hole when excavating the ground in an embedded concrete pile embedding method or the like, and a drilling method using the drilling stabilization liquid.

In the typical method of embedding concrete piles in foundation construction for construction, etc., after excavating the ground up to the support layer using the excavation stirrer rod and injecting stabilization liquid, injecting the rooting liquid into the excavation hole. Next, while injecting a predetermined hydraulic slurry (hereinafter referred to as “pile circumference fixing liquid”), the excavation stirring rod is slowly pulled up, and then a ready-made concrete pile is set in the hole filled with the pile circumference fixing liquid. .
In this construction method, first, excavation of the ground is started, and at this time, in order to prevent collapse of the wall surface of the excavation hole, excavation is performed while filling the excavation hole with a excavation stabilizing liquid containing water-swellable clay such as bentonite. The drilling stability liquid used here prevents the wall from weakening and prevents the wall from collapsing due to the hydraulic pressure of the drilling stability liquid filling the inside of the drilling hole. The water-swellable clay in the excavation stabilizing liquid is thought to be because a water-stopping layer called a mud cake is formed by clogging and depositing between soil particles (Patent Document 1).

  On the other hand, by adding a specific anionic surfactant and a specific cationic surfactant to the cement slurry at a certain ratio, a pseudo polymer called string-like micelles is formed, and high viscoelasticity can be obtained. Is known (Patent Document 2). This pseudo polymer is constructed by intermolecular interactions other than covalent bonds, such as hydrophobic bonds in the alkyl chain part and unique interactions in the hydrophilic part. It has the characteristics that the structure collapses and viscoelasticity decreases (high thixotropic property). For this reason, the conventional organic polymer is such that the pseudo-polymer structure collapses to lower the viscosity during transportation where shear force is applied, and the pseudo-polymer structure is regenerated and viscoelasticity is restored at the site where the shear force is removed. Performance not found in system thickeners (coexistence of pumpability and viscoelasticity).

  Patent Document 3 discloses a rheology modifier that forms string micelles by combining a specific sulfate ester and a specific fatty acid alkanolamide to impart thixotropic properties and viscosity to water.

JP 2004-300190 A JP 2003-313536 A International Publication No. 2017/217445

However, when the ground to be excavated is constructed in a highly permeable geology such as a sand layer, gravel layer, or gravel layer (hereinafter also referred to as permeable ground) in the method of embedding prefabricated concrete piles, etc. In some cases, the wall of the excavation hole collapses, making it difficult to perform construction. Here, the water-permeable ground in the present invention refers to a ground having a water permeability coefficient of 10 ⁻⁴ cm / second or more measured by the soil permeability test (constant water level) of JISA 1218.

  TECHNICAL FIELD The present invention relates to an excavation method and an excavation stabilizing liquid that can suppress water loss generated in a water-permeable ground that causes collapse in an excavation hole when excavating in an embedded concrete pile embedding method or the like.

  The present invention includes (A) a rheology modifier (hereinafter referred to as component (A)), (B) a water-swellable clay (hereinafter referred to as component (B)), a hydraulic powder, and water. The present invention relates to an excavation method for excavating the ground using a stabilizing liquid while preventing collapse of the inner wall surface of the excavation hole.

  Moreover, this invention relates to the excavation stabilization liquid containing the said (A) component, the said (B) component, hydraulic powder, and water.

  According to the present invention, in an embedded concrete pile embedding method or the like, when excavating the ground, an excavation method that can suppress water loss occurring in the permeable ground that causes collapse in the excavation hole, and excavation stability Liquid is provided.

  The excavation stabilizing liquid of the present invention contains a rheology modifier, preferably a rheology modifier containing string-like micelles, as component (A), a water-swellable clay, and hydraulic powder as component (B). A slow-relaxed network structure is formed in the drilling stabilization liquid, and a specific storage elastic modulus is given. This stable drilling fluid with a specific storage modulus retains the water in the liquid with a slow relaxation network structure and can reduce water penetration into the permeable ground. It is thought that collapse can be prevented.

The excavation method of the present invention excavates the ground using the excavation stabilizing liquid containing component (A), component (B), hydraulic powder, and water while preventing the collapse of the inner wall surface of the excavation hole. It is a construction method.
The excavation stabilizer used in the excavation method of the present invention will be described below.

[Drilling stabilizer]
The excavation stabilizing liquid of the present invention is an excavation stabilizing liquid containing (A) component, (B) component, hydraulic powder, and water.

<(A) component>
The excavation stabilizing liquid of the present invention contains a rheology modifier as the component (A).

  The component (A) is preferably a rheology modifier containing string-like micelles from the viewpoint of obtaining a high water loss prevention effect. That is, the component (A) of the present invention is preferably a rheology modifier containing a compound that forms string micelles in water or a combination thereof. Therefore, the excavation stabilizing liquid of the present invention can contain string-like micelles formed from the component (A).

Confirmation of the string-like micelles of the component (A) of the present invention, for example, the formation of string-like micelles in water can be confirmed by an electron micrograph.
In addition, the fact that the component (A) of the present invention forms string micelles in water is judged by the fact that the dynamic viscoelasticity of the composition containing the component (A) and water shows behavior similar to that of the Maxwell type. it can. This behavior suggests entanglement of polymer structures with a finite molecular weight from the description of “Viscoelastic properties of aqueous surfactant solution” (Toshiyuki Shikata, Surface vol.29, No5 (1991), p399-499). Thus, although it is not a complete string-like micelle shape having an infinite molecular weight, it can be inferred that a string-like micelle having a sufficient length is formed to exhibit practically useful viscoelasticity.

As the rheology modifier of the component (A), one or more rheology modifiers selected from the following components (A1) to (A7) are preferable. Since the components (A1) to (A7) can form string micelles in water, a rheology modifier containing these components is suitable as the component (A).
Component (A1): (A1-1) A sulfuric ester or a salt thereof (hereinafter referred to as (A1-), wherein the hydrocarbon group has 12 to 22 carbon atoms and the alkylene oxide has an average addition mole number of 0 to 25. 1) component), and (A1-2) a rheology modifier containing a fatty acid alkanolamide (hereinafter referred to as (A1-2) component), wherein the fatty acid moiety has 10 to 22 carbon atoms (A2) component: (A2-1) a polyether compound (hereinafter referred to as (A2-1) component) in which the hydrocarbon group has 14 to 24 carbon atoms and the average added mole number of ethylene oxide is 5 to 19; A2-2) Rheology modifier containing fatty acid alkanolamide (hereinafter referred to as (A2-2) component) having 14 to 24 carbon atoms in the fatty acid moiety (A3) component: (A3-1) A naphthalenesulfonic acid formaldehyde condensate (hereinafter referred to as component (A3-1)) having a weight average molecular weight of 1,000 or more and 100,000 or less, and (A3-2) a hydrocarbon group having an average carbon number of 14 or more and 24 or less. A rheology modifier comprising a cationic surfactant having at least one (hereinafter referred to as component (A3-2)) (A4) component: (A4-1) betaine-type amphoteric surfactant (hereinafter referred to as (A4-1) And rheology modifier comprising (A4-2) ethylene oxide addition type alkyl sulfate ester type surfactant (hereinafter referred to as (A4-2) component) (A5) component: (A5-1) Rheology comprising a quaternary salt type cationic surfactant (hereinafter referred to as component (A5-1)) and (A5-2) an anionic aromatic compound (hereinafter referred to as component (A5-2)) (A6-1) Component: (A6-1) Quaternary salt type cationic surfactant (hereinafter referred to as (A6-1) component), and (A6-2) Bromide compound (hereinafter referred to as (A6-2)) Rheology modifier containing component (A7) Component: Rheology modifier containing a compound represented by the following general formula (a7)
R ^7a —CONH— (AO) _m —H (a7)
(In the general formula (a7), R ^7a is a hydrocarbon group having 7 to 35 carbon atoms, AO is an alkyleneoxy group having 2 to 4 carbon atoms, m is an average added mole number of AO, and 2 to 20 Is the number of

(A1) Component The (A1) component of the present invention is a rheology modifier containing the (A1-1) component and the (A1-2) component. The (A1) component of the present invention forms string-like micelles by associating the (A1-1) component and the (A1-2) component in water.

Component (A1-1) The component (A1-1) is a sulfate ester or a salt thereof, wherein the hydrocarbon group has 12 to 22 carbon atoms, and the average added mole number of alkylene oxide is 0 to 25. .
The hydrocarbon group of component (A1-1) is preferably a linear or branched alkyl group or a linear or branched alkenyl group, more preferably a linear or branched alkenyl group, still more preferably. Is a linear alkenyl group.
From the viewpoint of obtaining high viscoelasticity, the carbon number of the hydrocarbon group of the component (A1-1) is 12 or more, preferably 14 or more, more preferably 16 or more, still more preferably 18 or more, and 22 or less, preferably 20 or less.

  Examples of the hydrocarbon group of the component (A1-1) include one or more selected from a lauryl group, a myristyl group, a palmityl group, an oleyl group, a stearyl group, and a docosyl group, and preferably a myristyl group, a palmityl group, and an oleyl group. 1 or more selected from a group and a stearyl group, more preferably one or more selected from a palmityl group, an oleyl group and a stearyl group, still more preferably an oleyl group or a stearyl group, and still more preferably an oleyl group.

The average added mole number of the alkylene oxide of the component (A1-1) is 0 or more and 25 or less.
Examples of the alkylene oxide as the component (A1-1) include alkylene oxides having 2 to 4 carbon atoms. The alkylene oxide is preferably ethylene oxide. The component (A1-1) preferably contains ethylene oxide as alkylene oxide.

When the carbon number of the hydrocarbon group of the component (A1-1) is 12 or more and 16 or less, the average number of added moles of alkylene oxide is preferably 0 from the viewpoint of low environmental load.
When the carbon number of the hydrocarbon group of the component (A1-1) is 12 or more and 16 or less, the average number of added moles of alkylene oxide is preferably 1 or more, more preferably 2 or more, from the viewpoint of solubility in water. And from the viewpoint of increasing the arrangement density of the active agents in the string micelles, it is preferably 20 or less, more preferably 16 or less, still more preferably 14 or less, still more preferably 12 or less, even more preferably 10 or less, and even more. Preferably it is 8 or less, More preferably, it is 6 or less.
When the carbon number of the hydrocarbon group of the component (A1-1) is 17 or more and 22 or less, the average added mole number of alkylene oxide is preferably 2 or more, more preferably 4 or more, from the viewpoint of solubility in water. More preferably 5 or more, and from the viewpoint of increasing the arrangement density of the active agent in the string micelles, preferably 20 or less, more preferably 18 or less, still more preferably 16 or less, still more preferably 14 or less, and even more preferably. Is 12 or less.

  (A1-1) Inorganic salt, monoethanolammonium salt, diethanolammonium salt, triethanolammonium salt, morpholinium salt selected from sodium salt, ammonium salt, potassium salt, calcium salt, magnesium salt, etc. An organic ammonium salt selected from among them is preferred.

  As the component (A1-1), specifically, alkyl sulfate, alkenyl sulfate, polyoxyalkylene alkyl ether sulfate, polyoxyalkylene alkenyl ether sulfate, alkylphenyl sulfate, alkenyl phenyl sulfate, polyoxyalkylene alkyl phenyl ether sulfate, One or more types selected from polyoxyalkylene alkenyl phenyl ether sulfates are mentioned, and one or more types selected from alkenyl sulfates, polyoxyalkylene alkyl ether sulfates, and polyoxyalkylene alkenyl ether sulfates are preferable from the viewpoint of obtaining high viscoelasticity. , Polyoxyalkylene alkyl ether sulfates, and polyoxyalkylene alkenyls One or more selected from over ether sulfates are more preferable.

As the component (A1-1), a compound represented by the following general formula (a1) is preferable from the viewpoint of obtaining high viscoelasticity.
R ^1a —O— (R ^2a O) _n —SO ₃ M ¹ (a1)
[Wherein, R ^1a is a hydrocarbon group having 12 to 22 carbon atoms, R ^2a is an alkylene group having 2 to 4 carbon atoms, preferably an ethylene group, and n is an average number of moles added. It is a number from 0 to 25. M ¹ is a hydrogen atom or a cation, preferably an inorganic or organic cation. ]

In general formula (a1), R ^1a is preferably a linear or branched alkyl group or a linear or branched alkenyl group, more preferably a linear or branched alkenyl group, still more preferably. It is a linear alkenyl group.
From the viewpoint of obtaining high viscoelasticity, R ^1a has 12 or more, preferably 14 or more, more preferably 16 or more, still more preferably 18 or more, and 22 or less, preferably 20 or less.

In the general formula (a1), from the viewpoint of obtaining high viscoelasticity, R ^1a is, for example, one or more selected from a lauryl group, a myristyl group, a palmityl group, an oleyl group, a linole group, a stearyl group, and a docosyl group. Preferably at least one selected from a myristyl group, a palmityl group, a linole group, an oleyl group and a stearyl group, more preferably at least one selected from a linole group, a palmityl group, an oleyl group and a stearyl group, and more preferably Is at least one selected from a linole group, an oleyl group, and a stearyl group.

In the general formula (a1), when R ^1a has 12 to 16 carbon atoms, n is preferably 0 from the viewpoint of reducing environmental load.
In the general formula (a1), when R ^1a has 12 or more and 16 or less carbon atoms, n is preferably 1 or more, more preferably 2 or more, and in the string-like micelles from the viewpoint of solubility in water. From the viewpoint of increasing the arrangement density of the active agent, it is preferably 20 or less, more preferably 16 or less, still more preferably 14 or less, still more preferably 12 or less, still more preferably 10 or less, still more preferably 8 or less, and still more. Preferably it is 6 or less.
In the general formula (a1), when R ^1a has 17 to 22 carbon atoms, n is preferably 2 or more, more preferably 4 or more, still more preferably 5 or more, and from the viewpoint of solubility in water. From the viewpoint of increasing the arrangement density of the active agent in the cord-like micelle, it is preferably 20 or less, more preferably 18 or less, still more preferably 16 or less, still more preferably 14 or less, and still more preferably 12 or less.

In general formula (a1), M ¹ is a hydrogen atom, or an inorganic cation such as sodium ion, ammonium ion, potassium ion, calcium ion, magnesium ion, monoethanolammonium ion, diethanolammonium ion, triethanolammonium ion, morpholine Examples thereof include organic cations such as nium ions, preferably sodium ions, potassium ions, ammonium ions, calcium ions, and magnesium ions, and more preferably sodium ions and ammonium ions.

The average filling parameter of the component (A1-1) is preferably 1/3 or more and 1 or less from the viewpoint of obtaining high viscoelasticity. In the present invention, the average filling parameter is represented by the following equation.
Average filling parameter = v / (a0 × lc)
v: Volume of hydrocarbon group a0: Optimum head area of water interface of surfactant lc: Critical chain length of hydrocarbon chain

  The HLB derived by the Davis method of the component (A1-1) is preferably 10 or more and 40 or less from the viewpoint of obtaining high viscoelasticity.

(A1-2) Component The component (A1-2) is a fatty acid alkanolamide whose fatty acid moiety has 10 to 22 carbon atoms.

  The hydrocarbon group of the fatty acid part of the component (A1-2) is a hydrocarbon group containing a carbon atom of a carboxyl group in the raw fatty acid of the fatty acid alkanolamide, preferably a linear or branched alkyl group or linear or branched A chain alkenyl group, more preferably a linear or branched alkenyl group, and still more preferably a linear alkenyl group.

  The number of carbon atoms in the fatty acid moiety of the component (A1-2) is the number of carbon atoms including the carbon atom of the carboxyl group in the fatty acid alkanolamide raw material fatty acid, and from the viewpoint of obtaining high viscoelasticity, 10 or more, preferably 12 or more. It is preferably 14 or more, more preferably 16 or more, and 22 or less, preferably 20 or less, more preferably 18 or less, and still more preferably 18.

  Examples of the fatty acid alkanolamide (A1-2) include fatty acid monoethanolamide, fatty acid methyl monoethanolamide, fatty acid ethyl monoethanolamide, fatty acid propyl monoethanolamide, fatty acid methanol ethanolamide, fatty acid diethanolamide, and the like. From the viewpoint of obtaining viscoelasticity, fatty acid diethanolamide is preferable.

  The component (A1-2) is, for example, oleic acid diethanolamide, stearic acid diethanolamide, a compound having 10 to 18 carbon atoms in the fatty acid part of palm kernel fatty acid diethanolamide, coconut fatty acid diethanolamide, myristic acid diethanolamide, And lauric acid diethanolamide may be used, and two or more of these may be used in combination. The component (A1-2) is preferably one selected from oleic acid diethanolamide, palm kernel fatty acid diethanolamide, and palm fatty acid diethanolamide from the viewpoint of maintaining solubility in water and obtaining high viscoelasticity. More preferably, it is at least one selected from oleic acid diethanolamide and coconut fatty acid diethanolamide.

  The component (A1-2) is obtained by reacting a higher fatty acid and an alkanolamine, but byproducts other than the fatty acid alkanolamide are simultaneously generated. Examples of by-products include fatty acid alkanolamide fatty acid monoesters obtained by dehydration condensation of fatty acid alkanolamides and fatty acids, fatty acid alkanolamide fatty acid diesters, fatty acid alkanolamine monoesters obtained by dehydration condensation of alkanolamines and fatty acids, and fatty acid alkanolamine diesters. The component (A1-2) of the present invention may contain a small amount of the by-product as long as the effects of the present invention are not impaired. From the viewpoint of obtaining high viscoelasticity, the content of the by-product in the component (A1-2) is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, more preferably 100 parts by mass of the component (A1-2). Preferably it is 5 mass parts or less.

  The average filling parameter of the component (A1-2) is preferably ½ or more and 2 or less from the viewpoint of obtaining high viscoelasticity.

Component (A2) The component (A2) is a rheology modifier containing the component (A2-1) and the component (A2-2). The component (A2) of the present invention forms string micelles by associating the components (A2-1) and (A2-2) in water.

(A2-1) Component The component (A2-1) is a polyether compound having a hydrocarbon group having 14 to 24 carbon atoms and an average added mole number of ethylene oxide of 5 to 19. The component (A2-1) is a nonionic polyether compound. The component (A2-1) is a nonionic polyether compound having a hydrocarbon group having 14 to 24 carbon atoms and a polyoxyethylene group having an average added mole number of ethylene oxide of 5 to 19 It is preferable that

The hydrocarbon group of the component (A2-1) is preferably an alkyl group or an alkenyl group, more preferably a linear alkyl group or a linear alkenyl group.
The number of carbon atoms of the hydrocarbon group of the component (A2-1) is 14 or more, preferably 16 or more, more preferably 18 or more, and 24 or less, preferably 22 or less, more preferably, from the viewpoint of obtaining high viscoelasticity. 20 or less.
Examples of the hydrocarbon group of the component (A2-1) include one or more selected from a linolenic group, a linole group, an oleyl group, a stearyl group, a palmityl group, and a myristyl group, preferably a linole group, an oleyl group, and It is 1 or more types chosen from a stearyl group, More preferably, it is 1 or more types chosen from an oleyl group and a stearyl group.

  From the viewpoint of obtaining high viscoelasticity, the average added mole number of ethylene oxide as the component (A2-1) is 5 or more, preferably 6 or more, more preferably 7 or more, still more preferably 8 or more, and 19 or less, preferably Is 15 or less, more preferably 14 or less, and still more preferably 12 or less.

  Specific examples of the component (A2-1) include one or more selected from polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkenyl phenyl ether. From the viewpoint of obtaining high viscoelasticity, one or more selected from polyoxyethylene alkyl ether and polyoxyethylene alkenyl ether are preferable.

(A2-2) Component The component (A2-2) is a fatty acid alkanolamide having a fatty acid moiety having 14 to 24 carbon atoms.

  The hydrocarbon group of the fatty acid part of the component (A2-2) is preferably a linear or branched alkyl group or a linear or branched alkenyl group in the raw fatty acid of the fatty acid alkanolamide, more preferably A linear alkyl group or an alkenyl group is preferable, and a linear alkenyl group is more preferable.

  The number of carbon atoms in the fatty acid portion of the component (A2-2) is the number of carbon atoms containing a carbon atom of the carboxyl group in the fatty acid alkanolamide raw material fatty acid, and from the viewpoint of obtaining high viscoelasticity, it is 14 or more, preferably 16 or more. Preferably it is 18 or more and 24 or less, preferably 22 or less, more preferably 20 or less.

The component (A2-2) is obtained by reacting a fatty acid having 14 to 24 carbon atoms with an alkanolamine.
Examples of the raw fatty acid of the fatty acid part of the component (A2-2) include one or more selected from linolenic acid, linoleic acid, oleic acid, stearic acid, palmitic acid, and myristic acid, preferably oleic acid, stearin One or more selected from acids and palmitic acid, more preferably one or more selected from oleic acid and stearic acid, and still more preferably oleic acid.

  Examples of the fatty acid alkanolamide as the component (A2-2) include fatty acid monoethanolamide, fatty acid methyl monoethanolamide, fatty acid ethyl monoethanolamide, fatty acid propyl monoethanolamide, fatty acid methanol ethanolamide, fatty acid diethanolamide, and the like. From the viewpoint of obtaining viscoelasticity, fatty acid diethanolamide is preferable.

  Examples of the component (A2-2) include linolenic acid diethanolamide, linoleic acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide, palmitic acid diethanolamide, myristic acid diethanolamide, and the like. May be. The component (A2-2) is preferably at least one selected from oleic acid diethanolamide, stearic acid diethanolamide, and palmitic acid diethanolamide, more preferably oleic acid diethanolamide, from the viewpoint of obtaining high viscoelasticity. .

  The component (A2-2) is obtained by reacting a higher fatty acid and an alkanolamine, but byproducts other than the fatty acid alkanolamide are simultaneously generated. Examples of by-products include fatty acid alkanolamide fatty acid monoesters obtained by dehydration condensation of fatty acid alkanolamides and fatty acids, fatty acid alkanolamide fatty acid diesters, fatty acid alkanolamine monoesters obtained by dehydration condensation of alkanolamines and fatty acids, and fatty acid alkanolamine diesters. (A2-2) of the present invention may contain a small amount of the above-mentioned by-product as long as the effects of the present invention are not impaired. From the viewpoint of obtaining high viscoelasticity, the content of the by-product in (A2-2) is (A2-2) in 100 parts by mass, preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and still more preferably. 5 parts by mass or less.

(A3) component (A3) component of this invention is a rheology modifier containing (A3-1) component and (A3-2) component. The component (A3) of the present invention forms string micelles by associating the components (A3-1) and (A3-2) in water.

(A3-1) Component The (A3-1) component is a naphthalenesulfonic acid formaldehyde condensate having a weight average molecular weight of 1,000 or more and 100,000 or less.

The weight average molecular weight of the component (A3-1) is 1,000 or more, preferably 2,000 or more, more preferably 3,000 or more, and high during production from the viewpoint of improving the viscoelasticity of the resulting composition. From the viewpoint of securing the fluidity of the concentration condensate, it is 100,000 or less, preferably 70,000 or less, more preferably 50,000 or less, still more preferably 30,000 or less, and even more preferably 15,000 or less. .
The weight average molecular weight of the component (A3-1) was calculated by area comparison by GPC (gel permeation chromatography method: UV detection) measurement using sodium polystyrene sulfonate as a standard substance. Specific conditions are as follows.

GPC condition column: G4000SWXL + G2000SWXL (Tosoh Corporation)
Eluent: 30 mM CH3COONa / CH3CN = 6/4
Flow rate: 0.7ml / min
Detection: UV280nm
Sample size: 0.2 mg / ml
Standard substance: manufactured by Nishio Kogyo Co., Ltd. Polystyrene sulfonate sodium equivalent (monodispersed sodium polystyrene sulfonate: molecular weight, 206, 1,800, 4,000, 8,000, 18,000, 35,000, 88,000, 780,000)
Detector: Tosoh Corporation UV-8020

  As the component (A3-1), a commercially available product can be used. Examples of the method for producing the component (A3-1) include a method of obtaining a condensate by a condensation reaction of naphthalenesulfonic acid and formaldehyde. You may neutralize the said condensate. Moreover, you may remove the water insoluble matter byproduced by neutralization. Specifically, in order to obtain naphthalenesulfonic acid, 1.2 to 1.4 mol of sulfuric acid is used with respect to 1 mol of naphthalene and reacted at 150 to 165 ° C. for 2 to 5 hours to obtain a sulfonated product. Next, formalin is added dropwise at 85 to 95 ° C. over 3 to 6 hours to form 0.95 to 0.99 mol as formaldehyde with respect to 1 mol of the sulfonated product, and condensed at 95 to 105 ° C. after the addition. Perform the reaction. Furthermore, since the aqueous solution of the obtained condensate has high acidity, water and a neutralizing agent are added to the obtained condensate from the viewpoint of suppressing metal corrosion in storage tanks, and a neutralization step is performed at 80 to 95 ° C. be able to. The neutralizing agent is preferably added in an amount of 1.0 to 1.1 moles per each of naphthalenesulfonic acid and unreacted sulfuric acid. Moreover, the water-insoluble matter which arises by neutralization can be removed, and preferably the separation by filtration is mentioned as the method. By these steps, an aqueous solution of a naphthalenesulfonic acid formaldehyde condensate water-soluble salt is obtained. This aqueous solution can be used as it is as an aqueous solution of the component (A3-1) of the present invention. The concentration of the naphthalene sulfonic acid formaldehyde condensate in the aqueous solution is preferably 10% by mass or more, more preferably 20% by mass or more, and preferably 60% by mass from the viewpoint of economical efficiency during transportation, depending on the use. Hereinafter, it is more preferably 50% by mass or less. Furthermore, if necessary, the aqueous solution can be dried and pulverized to obtain a powdery salt of naphthalenesulfonic acid formaldehyde condensate, which can be used in the present invention as a powdery component (A3-1). . Drying and powdering can be performed by spray drying, drum drying, freeze drying, or the like.

(A3-2) Component The (A3-2) component contains a cationic surfactant having at least one hydrocarbon group having an average carbon number of 14 or more and 24 or less (hereinafter also referred to as a long-chain hydrocarbon group).

  The long chain hydrocarbon group as the component (A3-2) is preferably a linear or branched alkyl group or a linear or branched alkenyl group. The average carbon number of the long chain hydrocarbon group of the component (A3-2) is 14 or more, preferably 16 or more, more preferably more than 16 from the viewpoint of enhancing the entanglement of the hybrid string-like micelle and increasing the viscoelasticity. From the viewpoint of availability (raw material cost), it is 24 or less, preferably 22 or less.

  (A3-2) As a preferable cationic surfactant, the cationic surfactant represented by the following general formula (a3) is mentioned.

[Wherein, R ^3a is an alkyl group or alkenyl group having an average carbon number of 14 to 24, preferably an alkyl group, R ^4a is an alkyl group having 1 to 24 carbon atoms, or an alkenyl group having 2 to 24 carbon atoms, R ^5a and R ^6a are each an alkyl group having 1 to 3 carbon atoms. X ⁻ represents an anionic group. ]

In the general formula (a3), from the viewpoint of obtaining practically sufficient viscoelasticity, R ^3a has an average carbon number of 14 or more, preferably 16 or more, more preferably more than 16 and preferably 24 or less, preferably 22 or less. R ^4a , R ^5a and R ^6a are each preferably a methyl group. X ⁻ is preferably an anion group selected from halide ions, sulfate ions, methyl sulfate ions and ethyl sulfate ions, more preferably an anion group selected from halide ions, and even more preferably a chloride ion.

  As the component (A3-2), a quaternary ammonium salt having at least one hydrocarbon group having an average carbon number of 14 or more and 24 or less is preferable. Examples of the component (A3-2) include alkyl (average carbon number 14 to 24) trimethylammonium salt, alkyl (average carbon number 14 to 24) pyridinium salt, alkyl (average carbon number 14 to 24) imidazolinium. Salt, alkyl (average carbon number 14 to 24) dimethylbenzylammonium salt, and the like. Specific examples include hexadecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride, octadecyltrimethylammonium bromide, docosyl. Trimethylammonium chloride, tallow trimethylammonium chloride, tallow trimethylammonium bromide, hydrogenated tallow trimethylammonium chloride, hydrogenated tallow Limethylammonium bromide, hexadecylethyldimethylammonium chloride, octadecylethyldimethylammonium chloride, hexadecylpropyldimethylammonium chloride, hexadecylpyridinium chloride, 1,1-dimethyl-2-hexadecylimidazolinium chloride, hexadecyldimethylbenzyl Examples thereof include ammonium chloride, and two or more of these may be used in combination. The component (A3-2) is preferably an alkyl (average carbon number of 14 to 24) trimethylammonium salt, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride from the viewpoint that the melting point is relatively low and handling at room temperature is simple. From the viewpoint of availability (raw material cost), hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, and docosyltrimethylammonium chloride are more preferable. In addition, two or more kinds of cationic surfactants having different carbon numbers in the above alkyl group can be used in combination.

(A4) component (A4) component of this invention is a rheology modifier containing (A4-1) component and (A4-2) (A4-2) component. The component (A4) of the present invention forms string micelles by associating the components (A4-1) and (A4-2) in water.

(A4-1) Component (A4-1) The component is a betaine amphoteric surfactant. Examples of the betaine-type amphoteric surfactant include at least one selected from dodecanoic acid amidopropyl betaine, octadecanoic acid amidopropyl betaine, and dodecyldimethylaminoacetic acid betaine, and dodecanoic acid amidopropyl betaine is preferable from the viewpoint of viscosity expression.

(A4-2) Component The component (A4-2) is an ethylene oxide addition type alkyl sulfate ester type surfactant. The ethylene oxide addition type alkyl sulfate ester type surfactant is selected from POE (3) dodecyl ether sulfate ester, POE (2) dodecyl ether sulfate ester, and POE (4) dodecyl ether sulfate ester. Examples of the salts include metal salts such as sodium salts, alkanolamine salts such as triethanolamine salts, and the like. Among these, the combination of dodecanoic acid amidopropyl betaine and POE (3) dodecyl ether sulfate triethanolamine or POE (3) dodecyl ether sulfate sodium is preferable. POE is an abbreviation for polyoxyethylene, and the numbers in parentheses are the average number of moles of ethylene oxide added.

Component (A5) The component (A5) is a rheology modifier containing the component (A5-1) and the component (A5-2). The component (A5) of the present invention forms string micelles by associating the component (A5-1) and the component (A5-2) in water.

(A5-1) Component (A5-1) The component is a quaternary salt type cationic surfactant. The quaternary salt type cationic surfactant has at least one saturated or unsaturated linear or branched alkyl group containing 10 to 26 carbon atoms in the structure. Is preferred. For example, alkyl (10 to 26 carbon atoms) trimethylammonium salt, alkyl (10 to 26 carbon atoms) pyridinium salt, alkyl (10 to 26 carbon atoms) imidazolinium salt, and alkyl (10 to 26 carbon atoms) One or more selected from dimethylbenzylammonium salts can be mentioned. Quaternary salt type cationic surfactants are specifically hexadecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride, octadecyltrimethylammonium bromide, tallow trimethylammonium chloride, tallow trimethylammonium bromide, hydrogen Tallow trimethylammonium chloride, hydrogenated tallow trimethylammonium bromide, hexadecylethyldimethylammonium chloride, octadecylethyldimethylammonium chloride, hexadecylpropyldimethylammonium chloride, hexadecylpyridinium chloride, 1,1-dimethyl-2-hexadecylimidazo Linium chloride, hexadecyl di Chill benzyl ammonium chloride, and the like, may be used in combination of two or more of these.

(A5-2) Component (A5-2) The component is an anionic aromatic compound. Examples of the anionic aromatic compound include one or more selected from carboxylic acid having an aromatic ring, phosphonic acid, sulfonic acid, and salts thereof, and specifically, salicylic acid, p-toluenesulfonic acid, sulfosalicylic acid. Benzoic acid, m-sulfobenzoic acid, p-sulfobenzoic acid, 4-sulfophthalic acid, 5-sulfoisophthalic acid, p-phenolsulfonic acid, m-xylene-4-sulfonic acid, cumenesulfonic acid, methylsalicylic acid, styrene One or more selected from sulfonic acid, chlorobenzoic acid, and salts thereof are preferred. However, when the anionic aromatic compound is a polymer, the weight average molecular weight of the anionic aromatic compound (for example, gel permeation chromatography method / polyethylene oxide conversion) is preferably less than 500.

Component (A6) The component (A6) is a rheology modifier containing the component (A6-1) and the component (A6-2). The (A6) component of the present invention forms string micelles by associating the (A6-1) component and the (A6-2) component in water.

(A6-1) Component (A6-1) The component is a quaternary salt type cationic surfactant. The component (A6-1) is the same as the component (A5-1), and all items described in the component (A5-1) can be applied.

(A6-2) Component (A6-2) The component is a bromide compound. The bromide compound is preferably at least one selected from inorganic salts, and preferably at least one selected from sodium bromide, potassium bromide, and hydrogen bromide.

(A7) component (A7) component of this invention is a rheology modifier containing the compound represented by the following general formula (a7). The (A7) component of the present invention forms string micelles when the (A7) components associate with each other in water.
R ^7a —CONH— (AO) _m —H (a7)
(In the general formula (a7), R ^7a is a hydrocarbon group having 7 or more carbon atoms, preferably 9 or more and 35 or less, preferably 23 or less, AO is an alkyleneoxy group having 2 to 4 carbon atoms, m is (The average number of moles of AO added is 2 or more, preferably 3 or more, and 20 or less, preferably 12 or less.)

  The component (A) of the present invention is preferably one or more rheology modifiers selected from the components (A1), (A2), (A3), (A4) and (A5), (A1) One or more rheology modifiers selected from the component and the component (A2) are more preferable, and the component (A1) is more preferable. That is, the excavation stabilizing liquid of the present invention preferably contains (A1-1) component, (A1-2) component, (B) component, hydraulic powder, and water.

<(B) component>
The water-swellable clay used as the component (B) in the excavation stabilizing liquid of the present invention is bentonite (including natural or synthetic bentonite), montmorillonite (including natural or synthetic montmorillonite), beidellite, nontronite, laponite, and saconite. Hectrites (including natural or synthetic hectorites), smectite group clay minerals such as stevensite, vermiculite, swellable synthetic fluorinated mica (Na-type, Li-type synthetic mica), and swellable mica. 1 type (s) or 2 or more types can be used. The water-swellable clay is preferably at least one selected from bentonite, montmorillonite, beidellite, nontronite, laponite, and hectorite from the viewpoint of economy and availability, and is selected from bentonite, montmorillonite, and hectorite. More than seeds are more preferable, and bentonite is still more preferable.

  As the water-swellable clay, commercially available products used for construction and civil engineering foundation work can be used. When bentonite is used as the water-swellable clay, bentonite containing a large amount of montmorillonite is preferred, and bentonite containing a large amount of hydrated and water-swellable Na-montmorillonite is more preferred.

In the present invention, “water swellability” refers to a bentonite test method defined in the 15th revised Japanese Pharmacopoeia, and the swelling force expressed by the swelling volume (cm ³ ) of 2 g of clay mineral is 20 cm. ^The thing which is ³ / g or more.

<Hydraulic powder>
The hydraulic powder used in the drilling stabilizing liquid of the present invention is a powder that hardens when mixed with water. For example, ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, sulfate-resistant Portland cement And low heat Portland cement, white Portland cement, and eco-cement (for example, JIS R5214). Among these, from the viewpoint of obtaining high viscoelasticity, a cement selected from early-strength Portland cement, ordinary Portland cement, sulfate-resistant Portland cement and white Portland cement is preferable, and a cement selected from early-strength Portland cement and ordinary Portland cement. Is more preferable.

The hydraulic powder may include blast furnace slag, fly ash, silica fume, anhydrous gypsum, and the like, and may include non-hydraulic fine limestone powder. As the hydraulic powder, blast furnace cement, fly ash cement, or silica fume cement in which cement and blast furnace slag, fly ash, silica fume, or the like are mixed may be used.
Examples of the hydraulic powder include cement or a mixed powder of cement and bentonite.

<Composition of drilling stabilization liquid>
The excavation stabilizing liquid of the present invention is preferably 0.002 parts by mass or more, more preferably 0.01 parts by mass or more from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of the component (A). More preferably, it is 0.02 parts by mass or more, and from the viewpoint of pumpability, it is preferably 50 parts by mass or less, more preferably 30 parts by mass or less.

  When the component (A1) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A1-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.05 parts by mass or more, more preferably 0.10 parts by mass or more, further preferably 0.15 parts by mass or more, more preferably 0.2 parts by mass or more, and preferably 10% from the viewpoint of pumpability. It is contained in an amount of not more than mass parts, more preferably not more than 5.0 parts by mass, still more preferably not more than 1.0 parts by mass.

  When the component (A1) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A1-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.05 parts by mass or more, more preferably 0.10 parts by mass or more, further preferably 0.15 parts by mass or more, more preferably 0.2 parts by mass or more, still more preferably 0.25 parts by mass or more, and From the viewpoint of pumpability, the content is preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less, and still more preferably 1.0 parts by mass or less.

  When the component (A1) is contained as the component (A), the mass ratio (A1-1) between the content of the component (A1-1) and the content of the component (A1-2) in the excavation stabilization liquid of the present invention. ) / (A1-2) is preferably 0.1 or more, more preferably 0.25 or more, still more preferably 0.5 or more, and preferably 10 or less, from the viewpoint of obtaining a high water loss prevention effect. Preferably it is 4 or less, More preferably, it is 2 or less.

  When the component (A2) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A2-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.25 parts by mass or more, more preferably 0.5 parts by mass or more, further preferably 1 part by mass or more, and from the viewpoint of pumpability, preferably 25 parts by mass or less, more preferably 20 parts by mass or less, More preferably, it contains 15 parts by mass or less.

  When the component (A2) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A2-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.25 parts by mass or more, more preferably 0.5 parts by mass or more, further preferably 1 part by mass or more, and from the viewpoint of pumpability, preferably 25 parts by mass or less, more preferably 20 parts by mass or less, More preferably, it contains 15 parts by mass or less.

  When the component (A3) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A3-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.001 part by mass or more, more preferably 0.005 part by mass or more, further preferably 0.01 part by mass or more, and preferably 20 parts by mass or less, more preferably 15 parts by mass from the viewpoint of pumpability. The content is more preferably 10 parts by mass or less.

  When the component (A3) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A3-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.001 part by mass or more, more preferably 0.005 part by mass or more, further preferably 0.01 part by mass or more, and preferably 20 parts by mass or less, more preferably 15 parts by mass from the viewpoint of pumpability. The content is more preferably 10 parts by mass or less.

  When the component (A4) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A4-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A4) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A4-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A5) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A5-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A5) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A5-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A6) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A6-1) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A6) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably a component (A6-2) from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of water. Is 0.005 parts by mass or more, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and from the viewpoint of pumpability, preferably 10 parts by mass or less, more preferably 8 parts by mass. Hereinafter, more preferably 5 parts by mass or less is contained.

  When the component (A7) is contained as the component (A), the excavation stabilizing liquid of the present invention is preferably 0 from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of the component (A7). 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, still more preferably 0.3 parts by mass or more, and from the viewpoint of pumpability, preferably 20 parts by mass or less, more preferably 10 parts by mass or less, More preferably 5 parts by mass or less is contained.

  The drilling stabilizing liquid of the present invention is preferably 1.0 part by mass or more, more preferably 2.5 parts by mass or more from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of the component (B). Further, it is preferably 4.0 parts by mass or more, and from the viewpoint of obtaining good pumpability, it is preferably 15 parts by mass or less, more preferably 10 parts by mass or less, and still more preferably 7.0 parts by mass or less.

In the excavation stabilizing liquid of the present invention, the water / hydraulic powder ratio (W / C) is preferably 500% by mass or more, more preferably 1,000% by mass or more, from the viewpoint of obtaining a high water loss prevention effect. Preferably it is 1,500 mass% or more, and preferably is 10,000 mass% or less, More preferably, it is 5,000 mass% or less, More preferably, it is 4,000 mass% or less.
Here, the water / hydraulic powder ratio (W / C) is a mass percentage (mass%) of water and hydraulic powder in the excavation stabilizing liquid, and is calculated as water / hydraulic powder × 100. .
In addition, the hydraulic powder is selected from powder having physical properties such as cement, which is hardened by a hydration reaction, powder having pozzolanic action, powder having latent hydraulic property, and stone powder (calcium carbonate powder). When powder is included, in the present invention, these amounts are also included in the amount of hydraulic powder. In addition, when the powder having physical properties that hardens by a hydration reaction contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of the hydraulic powder. The same applies to other mass parts related to the mass of the hydraulic powder.

  From the viewpoint of obtaining a high water loss prevention effect, the excavation stabilizing liquid of the present invention comprises (C) polyethylene glycol having a weight average molecular weight of 500 or more, polypropylene glycol having a weight average molecular weight of 500 or more, ethylene oxide and propylene oxide having a weight average molecular weight of 500 or more. It is preferable to contain at least one compound selected from a copolymer and an ether compound having a hydrocarbon group and a polyoxyalkylene group (hereinafter referred to as component (C)).

The weight average molecular weight of the component (C) polyethylene glycol is preferably 1,000 or more, more preferably 2,000 or more, still more preferably 5,000 or more, and preferably 20 from the viewpoint of the viscosity of the dispersion stabilizer. , 0000 or less, preferably 150,000 or less, more preferably 120,000 or less, still more preferably 90,000 or less, even more preferably 50,000 or less, and even more preferably 20,000 or less.
The weight average molecular weight of the component (C) polypropylene glycol is preferably 500 or more, more preferably 700 or more, and preferably 5,000 or less, more preferably 3,000 or less.
The weight average molecular weight of the copolymer of ethylene oxide and propylene oxide as component (C) is preferably 1,000 or more, more preferably 2,000 or more, and preferably 25,000 or less, more preferably 20,000 or less. It is.

  The weight average molecular weight of the component (C) is a value measured by a gel permeation chromatography (GPC) method using polystyrene as a standard. When the component (C) is polyethylene glycol, water / ethanol can be used as a solvent. .

  Among the components (C), at least one compound selected from ether compounds having a hydrocarbon group and a polyoxyalkylene group has a hydrocarbon group preferably having 10 to 22 carbon atoms. The polyoxyalkylene group is preferably a group selected from a polyoxyethylene group and a polyoxypropylene group, and more preferably a polyoxyethylene group. The average added mole number of the polyoxyalkylene group is preferably 9 or more and 5,000 or less.

  From the viewpoint that compounds having a wide range of weight average molecular weight can be used, the component (C) is one or more kinds selected from polyethylene glycol having a weight average molecular weight of 500 or more and a copolymer of ethylene oxide and propylene oxide having a weight average molecular weight of 500 or more. A polymer is preferable, and one or more polymers selected from polyethylene glycol having a weight average molecular weight of 500 or more are more preferable.

  When the excavation stabilizing liquid of the present invention contains the component (C), the excavation stabilizing liquid of the present invention is preferably used from the viewpoint of obtaining a high water loss prevention effect with respect to 100 parts by mass of the component (C). 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, further preferably 0.15 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less, and further preferably 1 0.0 parts by mass or less.

  The excavation stabilizing liquid of the present invention has an octanol / water partition coefficient of -1.6 or more and 1 as the component (D) from the viewpoint of making the excavation stabilizing liquid of the present invention into a one-pack type having a viscosity with good handleability. It is preferable to contain the compound which has a hydroxyl group which is .2 or less.

  In the present invention, the octanol / water partition coefficient of component (D) is a coefficient indicating the affinity of an organic compound for water and 1-octanol, expressed by a log P value. 1-octanol / water partition coefficient P is a distribution equilibrium when a trace amount of compound is dissolved as a solute in a two-liquid solvent of 1-octanol and water, and is a ratio of the equilibrium concentration of the compound in each solvent. It is common to show them in the form of their logarithm logP for the base 10. LogP values of many compounds have been reported, and many values are listed in databases available from Daylight Chemical Information Systems, Inc. (Daylight CIS), etc., and can be referred to. When there is no measured logP value, it can be calculated by the program “CLOGP” or the like available from Daylight CIS. This program outputs the value of “calculation logP (ClogP)” calculated by the fragment approach of Hansch and Leo together with the measured logP value, if any.

  The fragment approach is based on the chemical structure of the compound and takes into account the number of atoms and the type of chemical bond (cf. A. Leo, Comprehensive Medicinal Chemistry, Vol. 4, C. Hansch, PG Sammens, JB Taylor and CA Ramsden, Eds., P.295, Pergamon Press, 1990). This ClogP value can be used in place of the measured logP value when selecting a compound. In the present invention, if there is a measured value of logP, the ClogP value calculated by the program CLOGP v4.01 is used when there is no measured value. Hereinafter, the octanol / water partition coefficient may be expressed as Log Pow.

The component (D) is preferably a compound having 1 to 10 carbon atoms.
The component (D) is preferably a compound having 1 to 3 hydroxy groups.
The component (D) is preferably one or more compounds selected from a compound having one hydroxy group and a compound having two hydroxy groups.
The component (D) is preferably a compound having a molecular weight of 50 or more and 200 or less.

  Component (D) is preferably an organic compound having a hydroxy group, more preferably an aliphatic compound having a hydroxy group, still more preferably one or two hydroxy groups, and a carbon-carbon bond. An aliphatic compound having a saturated bond, and more preferably an aliphatic compound having two or more hydroxy groups and having a carbon-carbon bond being a saturated bond and having 5 or less carbon atoms.

  From the viewpoint of obtaining high viscoelasticity, the component (D) is preferably a compound having a solubility parameter (Fedors method) of 9 or more, further 10 or more, 20 or less, and further 18 or less. Hereinafter, the solubility parameter (Fedors method) may be expressed as an SP value.

The component (D) is preferably an organic compound having a hydroxy group. Examples of the organic compound having a hydroxy group include one or more compounds selected from the following (D1) and (D2).
(D1) Aromatic compound having a hydroxy group Specific examples include benzyl alcohol (Log Pow 1.10 / SP value 9.3).
(D2) Aliphatic compound having a hydroxy group Specifically, diethylene glycol monobutyl ether (Log Pow 0.56 / SP value 10.5), 2-butoxyethanol (Log Pow 0.83 / SP value 10.8), ethylene glycol monoisopropyl ether (Log Pow 0.05 / SP value 11.1), 1-butanol (LogPow 0.90 / SP value 11.3), 2-methoxyethanol (Log Pow -0.77 / SP value 12.0), triethylene glycol monobutyl ether (Log Pow 0.02 / SP value 10.3), Propylene glycol monobutyl ether (Log Pow 1.15 / SP value 10.4) Propylene propylene glycol (Log Pow 0.62 / SP value 10.5), 2-dimethylaminoethanol (Log Pow -0.58 / SP value 11.3), Diethanolamine (LogPow -1.43 / SP value) 15.4), 2-methylpentane-2,4-diol (Log Pow 0.58 / SP value 13.1), dipropylene glycol (Log Pow -0.70 / SP value 13.3), , 3-butanediol (Log Pow -0.85 / SP value 14.8), 1,4-butanediol (Log Pow -1.00 / SP value 15.0), diethylene glycol (LogPow -1.30 / SP value 15.0), neopentyl glycol (Log Pow 0.23 / SP value 13.8), propylene glycol (Log Pow -0.92 / SP value 15.9), ethylene glycol (Log Pow -1.36 / SP value 17.8), and the like.

  Component (D) is preferably (D2) an aliphatic compound having a hydroxy group, more preferably an aliphatic compound having one or two hydroxy groups, and the carbon-carbon bond is a saturated bond. More preferably, it is an aliphatic compound having 5 or less carbon atoms, which has two hydroxy groups and the carbon-carbon bond is a saturated bond.

The component (D) is preferably diethanolamine (Log Pow -1.43 / SP value 15.4), 2-methylpentane-2,4-diol (Log Pow 0.58 / SP value 13.1), dipropylene glycol (Log Pow -0.70 / SP value 13.3), 1,3-butanediol (Log Pow -0.85 / SP value 14.8), 1,4-butanediol (Log Pow -1.00 / SP value 15.0), diethylene glycol (LogPow -1.30 / SP value 15.0), One or more compounds selected from neopentyl glycol (Log Pow 0.23 / SP value 13.8), propylene glycol (Log Pow -0.92 / SP value 15.9), and ethylene glycol (Log Pow -1.36 / SP value 17.8) .
The component (D) is more preferably 1,3-butanediol (Log Pow -0.85 / SP value 14.8), 1,4-butanediol (Log Pow -1.00 / SP value 15.0), diethylene glycol (Log Pow -1.30). / SP value 15.0), neopentyl glycol (Log Pow 0.23 / SP value 13.8), propylene glycol (Log Pow -0.92 / SP value 15.9), and ethylene glycol (Log Pow -1.36 / SP value 17.8) These compounds.
Component (D) is one or more compounds selected from neopentyl glycol (Log Pow 0.23 / SP value 13.8) and propylene glycol (Log Pow -0.92 / SP value 15.9) from the viewpoint of odor and availability. preferable.

  From the viewpoint of obtaining a drilling stabilizing liquid having a low viscosity with a small addition amount of the component (D), the octanol / water partition coefficient of the component (D) is preferably 0.03 or more, more preferably 0.7 or more, and 1 .15 or less is preferable, and 0.85 or less is more preferable. Compounds with octanol / water partition coefficients in this range include benzyl alcohol, 1-butanol, 2-butoxyethanol, 2-methylpentane-2,4-diol, diethylene glycol monobutyl ether, neopentyl glycol, and ethylene glycol monoisopropyl ether 1 or more types selected from are preferred, and 2-butoxyethanol is more preferred.

  From the viewpoint of obtaining a drilling stabilizing liquid having a low viscosity with a small amount of component (D), the SP value of component (D) is preferably 9 or more, more preferably 10.7 or more, and preferably 11.5 or less. 11.2 or less is more preferable, and 11 or less is more preferable. One having at least an SP value within this range is preferably at least one selected from benzyl alcohol, diethylene glycol monobutyl ether, 2-butoxyethanol, ethylene glycol monoisopropyl ether, and 1-butanol. Benzyl alcohol, diethylene glycol monobutyl ether, 2- One or more selected from butoxyethanol and ethylene glycol monoisopropyl ether are more preferable, one or more selected from benzyl alcohol, diethylene glycol monobutyl ether and 2-butoxyethanol are more preferable, and 2-butoxyethanol is still more preferable.

From the viewpoint of inhibiting hydrolysis of the component (A), the component (D) is preferably a compound having no carboxy group.
If the octanol / water partition coefficient is within the range of the component (D), the component (D) includes 2-dimethylaminoethanol having a hydroxy group and an amino group (Log Pow -0.58 / SP value 11.3), Compounds such as diethanolamine (Log Pow -1.43 / SP value 15.4) can be used. From the viewpoint of obtaining a stable excavation stabilizing liquid having a viscosity with good handleability, the component (D) is preferably a compound having no amino group.

The excavation stabilizing liquid of the present invention comprises (D) component as benzyl alcohol, diethylene glycol monobutyl ether, propylene glycol, 2-butoxyethanol, ethylene glycol monoisopropyl ether, 1-butanol, 2-methylpentane-2,4-diol, And one or more compounds selected from neopentyl glycol.
(A) From the viewpoint of little influence on the component, imparting high viscoelasticity to the object, and maintaining product stability at a low temperature, the excavation stabilizing liquid of the present invention comprises two or more types of the component (D). It is preferable to contain. From this point of view, the excavation stabilizing liquid of the present invention contains benzyl alcohol, diethylene glycol monobutyl ether, 2-butoxyethanol, ethylene glycol monoisopropyl ether, 1-butanol, 2-methylpentane-2,4-diol as component (D). It is preferable to contain 2 or more types selected from propylene glycol and neopentyl glycol, and it is more preferable to contain propylene glycol and neopentyl glycol. When component (D) contains propylene glycol and neopentyl glycol, the mass ratio of propylene glycol / neopentyl glycol is preferably 20/80 or more, more preferably 30/70 or more, and even more preferably 40/60 or more. And preferably 80/20 or less, more preferably 70/30 or less, and still more preferably 60/40 or less.

  In addition, even if it has a hydroxy group, a compound in which Log Pow is outside the scope of the present invention, such as glycerin (Log Pow-1.76 / SP value 16.5), or even if Log Pow is within the scope of the present invention, For example, methylamine (Log Pow -0.71 / SP value 8.85), dimethylamine (Log Pow -0.20 / SP value 7.72), tetramethylethylenediamine (Log Pow 0.30 / SP value 7.74), It is considered that a stable excavation stabilizing liquid having a viscosity that is difficult to liquefy and has good handleability cannot be obtained.

  When the excavation stabilization liquid of the present invention contains the component (D), the excavation stabilization liquid of the present invention is obtained from the viewpoint of obtaining workability and a high water loss prevention effect with respect to 100 parts by mass of the component (D). , Preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, still more preferably 0.15 parts by weight or more, and preferably 3.0 parts by weight or less, more preferably 2.0 parts by weight or less. More preferably, the content is 1.0 part by mass or less.

The pH at 20 ° C. of the excavation stabilizing liquid of the present invention is preferably 3.0 or more, more preferably 3.5 or more, still more preferably 4.0 or more, and preferably 7.0 from the viewpoint of storage stability. Hereinafter, it is more preferably 6.5 or less, and still more preferably 6.0 or less.
The pH can be adjusted by adding a pH adjuster to the excavation stabilizing liquid of the present invention. Examples of the pH adjuster include lactic acid, citric acid, phosphoric acid, acetic acid, hydrochloric acid, and the like, and one or more of these can be used.

  From the viewpoint of workability, the viscosity of the excavation stabilizing liquid of the present invention is 20 ° C., preferably 2,500 mPa · s or less, more preferably 2,000 mPa · s or less, and still more preferably 1,500 mPa · s or less. More preferably, it is 500 mPa · s or less, preferably 50 mPa · s or more, more preferably 100 mPa · s or more, and further preferably 200 mPa · s or more. Here, the viscosity of the excavation stabilizer is 50 g of the excavation stabilizer to be measured in a screw tube (Marem, No. 7, 35 mm × 78 mm), and a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., VISCOMETER TVB- 10, the value measured after 3 minutes of stirring at a rotational speed of 12 rpm using a rotor M21).

  The excavation stabilizing liquid of the present invention may further contain other components other than the above components as long as the effects of the present invention are not affected. Examples thereof include a dispersant, an AE agent, a retarder, a foaming agent, a thickening agent, a foaming agent, a waterproofing agent, a fluidizing agent, an antifoaming agent and the like (except for the components (A) to (D)).

  The excavation stabilizing liquid of the present invention can be prepared by a conventional method. From the viewpoint of suppressing foaming, water (optionally adding an antifoaming agent), (B) component and hydraulic powder are used. After preparing a mixture by mixing, a composition prepared by adding (A) component and optional components (C), (D), a pH adjuster, etc. to a small amount of water, It is preferable to prepare by adding and mixing to the mixture.

[Drilling method]
The excavation method of the present invention is an excavation method in which the ground is excavated using the excavation stabilizing liquid of the present invention while preventing the collapse of the inner wall surface of the excavation hole.
The excavation method for excavating the ground while preventing the collapse of the inner wall surface of the excavation hole using the excavation stabilizing liquid of the present invention is excavated on the ground using an excavation stirring rod such as a drill, a BW excavator, a bucket hydrophrase, or an electro mill. When the excavation stabilizing liquid of the present invention is filled in the excavation hole while forming a hole, the water-swelling clay in the excavation stabilizing liquid is clogged between soil particles when the excavation stabilizing liquid penetrates the excavation wall surface. By depositing, a water-stopping layer called a mud cake is formed. The water blocking layer reinforces the excavation wall surface, and the collapse of the inner wall surface of the excavation hole is prevented by the water pressure of the excavation stabilizing liquid filling the excavation hole. Furthermore, the excavation stabilizing liquid in the excavation method of the present invention suppresses water leakage and prevents collapse in the excavation hole even if the excavated ground includes a permeable ground such as a sand layer, gravel layer or gravel layer. Can do. That is, the excavation stabilizing liquid of the present invention is suitable for permeable ground.

  As described above, after excavating while stabilizing the wall surface, for example, injecting root hardening liquid into the excavation hole, then slowly pulling up the excavation stirring rod while injecting pile circumference fixing liquid, and then The pile embedding method that integrates the ground and the pile by sinking a ready-made concrete pile into the hole filled with the pile circumference fixing liquid can be mentioned. The excavation method and the excavation stabilizing liquid of the present invention are suitable for, for example, cast-in-place concrete piles for manufacturing piles in the field, embedment methods for piles such as mortar columns, and are widely used for all methods that use excavation stabilizing liquids. can do.

(1) Preparation of compositions I, J, and K The following (A) component, (C) component, (D) component, and water are mixed in the compounding amounts shown in Table 1, and the pH at 20 ° C is 5.0. The following pH adjusters were added so as to prepare compositions I, J, and K, respectively. The amount of each component in Table 1 is an effective amount. The following (A) component forms a string-like micelle in water by the combination of Table 1.

(A) Component (A-1): polyoxyethylene alkenyl sulfate ester salt (in general formula (a1), R ^1a : alkenyl group having 18 carbon atoms (oleyl group), R ^2a : ethylene group, n: 9, M ¹ : Ammonium ion), (A1-1) Component (A-2): Oleic acid diethanolamide (a compound in which the fatty acid portion is an alkenyl group having 18 carbon atoms (oleyl group)), (A1-2) Component (A- 3): Coconut fatty acid diethanolamide (a compound in which the fatty acid portion is mainly composed of an alkyl group having 12 to 14 carbon atoms), (A1-2) component (C) component (C-1): polyethylene glycol (weight average molecular weight 8) , 500)
(D) Component (D-1): Propylene glycol pH adjuster: Lactic acid

(2) Preparation of Drilling Stabilizing Liquid With the blending amounts shown in Table 2, 30 seconds after adding water added to an antifoaming agent and hydraulic powder to a hand mixer (manufactured by Panasonic Corporation, MK-H4) Stir and mix. Subsequently, bentonite was added as component (B) and stirred for 30 seconds, and any of the compositions I, J and K prepared earlier was further added and stirred for 30 seconds to prepare a drilling stable liquid. The excavation stabilizing liquid containing the compositions I, J, and K contained string-like micelles formed by the component (A).

Each material used in the preparation of the excavation stabilizing liquid is as follows.
Water: tap water (the amount includes the amount of antifoam, composition I, J, K)
Antifoaming agent: DK Q1-1183, manufactured by Toray Dow Corning Co., Ltd. Hydraulic powder: ordinary Portland cement, Taiheiyo Cement Co., Ltd. and Sumitomo Osaka Cement Co., Ltd. mixed at a mass ratio of 50/50 , Specific gravity 3.16
Bentonite: Kunigel GS, manufactured by Kunimine Industry Co., Ltd.

(3) Evaluation of prevention of water loss 45 g of dried sand (Mikawa Silica No. 3, manufactured by Mikawa Silica Co., Ltd., bulk volume: about 30 mL) was placed in a 50 mL dropping funnel having a two-way cock. The two-way cock was closed, and 20 mL of the previously prepared drilling stabilizing solution was gently poured into the separatory funnel while hanging on the inner wall surface of the separatory funnel. Immediately after pouring the drilling stable liquid, measure the liquid volume of the liquid phase part excluding the sand volume from the scale of the dropping funnel, open the two-way cock, and measure the liquid quantity of the liquid phase part after 10 minutes. did. The results are shown in Table 2. It can be said that the greater the amount of the liquid phase portion after 10 minutes, the better the water loss prevention property.

  In Table 2, the added amount of each component is an effective amount.

Claims (16)

  (A) Rheology modifier (hereinafter referred to as “component (A)”), (B) water-swellable clay (hereinafter referred to as “component (B)”), hydraulic powder, and water containing a drilling stabilizer This excavation method excavates the ground while preventing the collapse of the inner wall of the excavation hole.   The excavation method according to claim 1, wherein the component (A) includes string micelles. The excavation method according to claim 1 or 2, wherein the component (A) is one or more rheology modifiers selected from the following components (A1) to (A7).
(A1) Component: (A1-1) A sulfuric ester or a salt thereof, wherein the hydrocarbon group has 12 to 22 carbon atoms and the average added mole number of alkylene oxide is 0 to 25, and (A1-2) ) A rheology modifier containing a fatty acid alkanolamide, wherein the fatty acid moiety has 10 to 22 carbon atoms (A2) Component: (A2-1) The hydrocarbon group has 14 to 24 carbon atoms, Rheology modifier containing a polyether compound having an average addition mole number of 5 or more and 19 or less, and (A2-2) a fatty acid alkanolamide having a fatty acid moiety having a carbon number of 14 or more and 24 or less (A3) component: (A3- 1) a naphthalenesulfonic acid formaldehyde condensate having a weight average molecular weight of 1,000 to 100,000, and (A3-2) an average of 14 or more carbon atoms A rheology modifier comprising a cationic surfactant having at least one hydrocarbon group of 24 or less (A4) component: (A4-1) a betaine-type amphoteric surfactant, and (A4-2) an ethylene oxide addition type Rheology modifier containing alkyl sulfate ester type surfactant (A5) Component: (A5-1) Rheology modifier containing quaternary salt type cationic surfactant and (A5-2) anionic aromatic compound Agent (A6) Component: (A6-1) Quaternary salt type cationic surfactant and (A6-2) Rheology modifier containing bromide compound (A7) Component: represented by the following general formula (a7) Rheology modifier containing
R ^7a —CONH— (AO) _m —H (a7)
(In the general formula (a7), R ^7a is a hydrocarbon group having 7 to 35 carbon atoms, AO is an alkyleneoxy group having 2 to 4 carbon atoms, m is an average added mole number of AO, and 2 to 20 Is the number of   The excavation method according to any one of claims 1 to 3, wherein the content of the component (A) in the excavation stabilization liquid is 0.002 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of water. .   The excavation method according to any one of claims 1 to 4, wherein a water / hydraulic powder ratio in the excavation stabilizing liquid is 500 mass% or more and 10,000 mass% or less.   In excavation stabilization liquid, content of (B) ingredient is 0.1 mass part or more and 2.0 mass parts or less to 100 mass parts of water, or any 1 paragraph of Claims 1-5. Excavation method.   The excavation method according to any one of claims 1 to 6, wherein the ground to be excavated includes permeable ground.   The excavation method according to any one of claims 1 to 7, which is used for a pile embedding method.   A drilling stabilizing liquid containing (A) a rheology modifier (hereinafter referred to as component (A)), (B) a water-swellable clay (hereinafter referred to as component (B)), a hydraulic powder, and water.   The drilling stabilization liquid according to claim 8, wherein the component (A) includes string-like micelles. The drilling stabilization liquid according to claim 9 or 10, wherein the component (A) is one or more rheology modifiers selected from the following components (A1) to (A7).
(A1) Component: (A1-1) A sulfuric ester or a salt thereof, wherein the hydrocarbon group has 12 to 22 carbon atoms and the average added mole number of alkylene oxide is 0 to 25, and (A1-2) ) A rheology modifier containing a fatty acid alkanolamide, wherein the fatty acid moiety has 10 to 22 carbon atoms (A2) Component: (A2-1) The hydrocarbon group has 14 to 24 carbon atoms, Rheology modifier containing a polyether compound having an average addition mole number of 5 or more and 19 or less, and (A2-2) a fatty acid alkanolamide having a fatty acid moiety having a carbon number of 14 or more and 24 or less (A3) component: (A3- 1) a naphthalenesulfonic acid formaldehyde condensate having a weight average molecular weight of 1,000 to 100,000, and (A3-2) an average of 14 or more carbon atoms A rheology modifier comprising a cationic surfactant having at least one hydrocarbon group of 24 or less (A4) component: (A4-1) a betaine-type amphoteric surfactant, and (A4-2) an ethylene oxide addition type Rheology modifier containing alkyl sulfate ester type surfactant (A5) Component: (A5-1) Rheology modifier containing quaternary salt type cationic surfactant and (A5-2) anionic aromatic compound Agent (A6) Component: (A6-1) Quaternary salt type cationic surfactant and (A6-2) Rheology modifier containing bromide compound (A7) Component: represented by the following general formula (a7) Rheology modifier containing
R ^7a —CONH— (AO) _m —H (a7)
(In the general formula (a7), R ^7a is a hydrocarbon group having 7 to 35 carbon atoms, AO is an alkyleneoxy group having 2 to 4 carbon atoms, m is an average added mole number of AO, and 2 to 20 Is the number of   The drilling stabilization liquid according to any one of claims 9 to 11, wherein the component (A) is contained in an amount of 0.002 parts by mass to 50 parts by mass with respect to 100 parts by mass of water.   The excavation stabilizing liquid according to any one of claims 9 to 12, wherein a water / hydraulic powder ratio is 500 mass% or more and 10,000 mass% or less.   The drilling stabilization liquid according to any one of claims 9 to 13, wherein the component (B) is contained in an amount of 0.1 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of water.   The excavation stabilizing liquid according to any one of claims 9 to 14, which is used for permeable ground. The excavation stabilizing liquid according to any one of claims 9 to 15, which is used for a pile embedding method.