JP2002302647A - Adhesion inhibitor for water-curable intimate mixture having good water resistance, buried body and adhesion preventive method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating material for inhibiting the adhesion of a water- curable intimate mixture which enables easy coating operation, and simultaneously, uniformly exhibits the action of inhibiting the adhesion between the surface of a base material and the water-curable intimate mixture, and additionally can be applied to various techniques due to the excellent adhesive strength of a coating film formed on the surface of a base material, a buried body obtained by applying the same, and a method for preventing the adhesion of a buried body. SOLUTION: The coating material for inhibiting the adhesion of a water- curable intimate mixture comprises (a) a water absorptive resin, (b) a binder resin having an acid value of <15 mgKOH/g, and (c) a solvent as the essential components, and inhibits the adhesion between the surface of a base material and the water-curable intimate mixture by being coating on the surface of the base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint for suppressing the adhesion of a hydraulic admixture, a buried object obtained by applying the same, and a method for preventing adhesion of the buried object.

[0002]

2. Description of the Related Art In the construction work such as the foundation work in the construction field and the civil engineering field, the work involving the construction of a ground foundation structure such as an earth retaining wall requires facilities, expenses, days, etc. It is desired to perform these processes efficiently by suppressing them. However, the paint for suppressing the admixture of hydraulic admixtures can reduce the cost of such foundation works and the like, and make it possible to complete the works quickly. For this reason, it has attracted attention recently.

[0003] For example, in a construction involving construction of an earth retaining wall or the like which is at least composed of an embedded object such as an H-shaped steel and a hydraulic admixture, the embedded object such as an H-shaped steel is embedded in a concrete hydrate or the like. The ground substructure in the state will be formed, but the H-section steel will be pulled out of the concrete hydrate so that it will not hinder other underground work after the completion of the work and to reuse it. become. At this time, since the H-shaped steel and the concrete hydrate are firmly bonded, the work efficiency is reduced by the work of extracting the H-shaped steel. The workability of drawing is improved by the coating film formed by the above, and the efficiency of construction is improved.

[0004] As described above, a technique for facilitating extraction of a buried object from a hydraulic admixture is disclosed in, for example, Japanese Patent Publication No. 5-1.
No. 9612 discloses that a polyvinyl alcohol (PVA) -based paste or the like is used as a rewetting binder for a rewetting lubricating layer obtained by kneading a water-absorbing polymer and a rewetting binder and drying and solidifying the mixture. Also, JP-A-63
JP-165615A relates to forming a film by applying a volatile film-forming resin and a superabsorbent resin, and using a latex obtained by suspending natural rubber, synthetic rubber or plastic in water as a volatile film-forming resin. It is disclosed for use.

In these techniques, the water-absorbent resin is attached to the surface of the base material. For example, the water-absorbent resin swells before the cement hardens and displaces the cement from the surface of the base material. Since water gradually disappears, the swollen water-absorbing resin shrinks, and a gap is formed between the hardened cement and the surface of the base material, thereby suppressing adhesion to the cement. When attaching the water-absorbent resin to the surface of the base material, water will be used to use PVA or latex as a binder, but if water is mixed in advance, the water-absorbent resin swells. First apply to the base material, while not drying, sprinkle the water-absorbent resin on it, mix with water, and apply the clay-like thing to the base material to form a coating film I have.

However, when the water-absorbent resin is spread, there have been problems that the water-absorbent resin cannot be applied uniformly and that the adhesion between the water-absorbent resin and the binder is low. In addition, when a clay-like material is applied, there is a problem in that application work such as spray application is difficult due to the high viscosity of the applied material, and the uniformity of the applied film is low. Therefore, there is room for devising to facilitate the coating operation and to uniformly exert the action of suppressing the adhesion between the substrate surface and the hydraulic admixture.

Japanese Patent Application Laid-Open No. 11-241339 discloses a surface treatment agent containing a water-swellable resin and an alkali water-soluble resin having an acid value of 15 mgKOH / g or more. The use of this surface treatment agent facilitates the coating operation and uniformly exerts the effect of suppressing the adhesion between the substrate surface and the hydraulic admixture, thereby improving workability in foundation work and the like. However, for example, when using a construction method in which there is a possibility that the coating film may be peeled off from the substrate surface in an embedded object such as steel sheet pile, suppression of the peeling of the coating film and hydraulic admixture with the substrate surface There is room for research to sufficiently apply the method to foundation work and the like using such a method by balancing the effect of suppressing the adhesion with the object.

[0008] Specifically, a column jet (which is a construction method in which a steel sheet pile or the like is cast in the soil and left for several days, and then, cement is sprayed to the surrounding ground such as a steel sheet pile or the like under the air by air pressure or high pressure. When the ground foundation is formed by performing the work of consolidating steel sheet piles by the CJ) method, especially when placing the sheet piles on soft ground with a lot of groundwater, the surface of the base material is placed in the groundwater for several days. Since cement is cast after contact,
In such a case, it is necessary to suppress the peeling of the coating film, to more reliably exert the effect of suppressing the adhesion between the substrate surface and the hydraulic admixture, and to devise to broaden the application use. There was room.

[0009]

SUMMARY OF THE INVENTION In view of the above situation, the present invention facilitates the coating operation and uniformly exerts the action of suppressing the adhesion between the substrate surface and the hydraulic admixture. Hydraulic admixture adhesion-suppressing paint that can be applied to various construction methods because of the excellent adhesion of the coating film formed on the base material surface, embedded objects obtained by applying it, and methods for preventing adhesion of embedded objects It is intended to provide.

[0010]

DISCLOSURE OF THE INVENTION The present inventors have studied a paint for suppressing the adhesion of a hydraulic compound, which is applied to the surface of a substrate to suppress the adhesion between the surface of the substrate and the hydraulic compound. When the water-absorbent resin (a), the binder resin (b) and the solvent (c) are essential components, the coating operation such as spray coating is facilitated, and the adhesion between the substrate surface and the hydraulic admixture is performed. First, attention is paid to the fact that the action of suppressing binder can be exerted uniformly. If the acid value of the binder resin (b) is less than 15 mgKOH / g, the water resistance of the coating film is improved. A decrease in adhesion between the base material surface and the coating film, which is considered to be caused by water absorption, is suppressed. For example, when performing construction by the column jet (CJ) method, particularly when performing construction on soft ground with a lot of groundwater, etc. , Water absorption It is prevented from coating before the resin (a) exerts its action is peeled from the substrate surface, and conceived that can be admirably solved the above problems. In addition, it has been found that when the binder resin is a water-insoluble resin, such an effect can be more reliably exerted, and a buried object obtained by applying such a paint,
It has also been found that the method for preventing the adhesion of a buried object using such a paint improves the efficiency of foundation work and the like in the construction field and the civil engineering field, and has reached the present invention.

That is, the present invention provides a water-absorbent resin (a) and a binder resin (b) having an acid value of less than 15 mgKOH / g.
(Hereinafter simply referred to as "binder resin (b)") and a solvent (c) as essential components. It is a paint for suppressing adhesion to a hydraulic mixture, which suppresses adhesion between the mixture and the mixture. The present invention is also a buried object buried in the hydraulic mixture, and is a buried object obtained by applying the paint for suppressing adhesion of the hydraulic mixture of the present invention. The invention further provides:
A method for preventing adhesion of a buried object, which suppresses the adhesion between the substrate surface of the buried object and the hydraulic admixture, comprising the paint for suppressing adhesion of a hydraulic admixture of the present invention, and / or the embedded object of the present invention. It is also a method of preventing adhesion of a buried object using the method. Hereinafter, the present invention will be described in detail.

The paint for suppressing adhesion of a hydraulic admixture of the present invention comprises:
Hydraulic admixture adhesion suppression layer (coating) applied to the substrate surface
By forming (1), the following effects (1) to (5) are exhibited. That is, (1) the water-absorbent resin (a) swells by absorbing water (alkaline water) in the hydraulic admixture, and the water-absorbent resin (a) that swells as the hydraulic admixture hydrates is dried and shrunk. In addition, since a gap can be formed between the surface of the base material and the hydraulic admixture, the surface of the substrate and the hydraulic admixture or hydrate thereof (cured product)
Can be suppressed.

(2) The binder resin (b) causes the water-absorbent resin (a) to adhere to the surface of the base material. This is because the acid value of the binder resin (b) is less than 15 mgKOH / g. As a result, the water resistance of the hydraulic admixture adhesion suppressing layer is improved, and the exfoliation of the hydraulic admixture adhesion suppressing layer is suppressed by various construction methods and construction conditions, and the adhesion can be maintained. Accordingly, it is possible to sufficiently exert the operation and effect of the above (1).

(3) The adhesion of the hydraulic admixture adhesion suppressing layer to the substrate surface is large, but if the strength is not so large, the hydraulic admixture adhesion suppressing layer peels off due to a large scratching force. Can be minimized. (4) By using the solvent (c), since the water-absorbent resin (a) does not absorb and swell when applied, it is possible to apply a uniform mixture, and the viscosity is low. Spray coating and the like are also possible, which facilitates the coating operation. (5) By utilizing the water resistance imparting agent layer as the top coat, the adhesion of the hydraulic mixture adhesion suppressing layer when casting the hydraulic mixture is maintained (prevention of peeling), and the water absorbing resin (a) is used. Water absorption swelling by the alkaline water in the hydraulic mixture can be more sufficiently compatible.

The essential components of the paint for suppressing adhesion of a hydraulic admixture of the present invention will be described below. As the water-absorbing resin (a) that constitutes the hydraulic admixture adhesion-inhibiting coating material of the present invention, a resin that swells by absorbing water, and has a water absorption ratio of ion exchange water to its own weight of 3 times or more. There is no particular limitation.

As the water-absorbent resin (a), for example,
Cross-linked poly (meth) acrylic acid, cross-linked poly (meth) acrylate, cross-linked poly (meth) acrylate having a sulfonic acid group, cross-linked poly (meth) acrylate having a polyoxyalkylene group, Poly (meta)
Crosslinked acrylamide, crosslinked copolymer of (meth) acrylate and (meth) acrylamide, crosslinked copolymer of hydroxyalkyl (meth) acrylate and (meth) acrylate, crosslinked polydioxolane, crosslinked poly Ethylene oxide, cross-linked polyvinyl pyrrolidone, cross-linked sulfonated polystyrene, cross-linked polyvinyl pyridine, saponified starch-poly (meth) acrylonitrile graft copolymer, starch-poly (meth) acrylic acid (salt) graft cross-linked copolymer, polyvinyl alcohol Reaction products of carboxylic acid and maleic anhydride (salt), crosslinked polyvinyl alcohol sulfonate, polyvinyl alcohol-acrylic acid graft copolymer, polyisobutylene maleic acid (salt) crosslinked polymer and the like. These may be used alone,
Two or more kinds may be used in combination.

Preferred examples of the water-absorbent resin (a) include a water-absorbent resin having a nonionic group and / or a sulfonic acid (salt) group, and more preferably a water-absorbent resin having an amide group or a hydroxyalkyl group. And a cross-linked copolymer of (meth) acrylate and (meth) acrylamide, and a cross-linked copolymer of hydroxyalkyl (meth) acrylate and (meth) acrylate. be able to. Further, as a particularly preferred embodiment, a water-absorbing resin having a polyoxyalkylene group can be mentioned, for example, a copolymerized crosslinked product of a (meth) acrylate and a (meth) acrylate having a methoxypolyoxyalkylene group, and the like. Can be exemplified. In these embodiments, the water absorbency with respect to alkaline water is improved, but the water-absorbent resin having a methoxypolyoxyalkylene group is particularly excellent.

The water-absorbent resin (a) may be a resin obtained by polymerizing a water-soluble ethylenically unsaturated monomer and, if necessary, a monomer component containing a crosslinking agent. Can be. In this case, the water-absorbent resin (a) is preferable because it has excellent water absorbency with water and is generally inexpensive. The ethylenically unsaturated monomer that forms such a water-absorbent resin and the crosslinking agent used as necessary are not particularly limited, and examples of the ethylenically unsaturated monomer include the following. One or more of the following monomers.

(Meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, citraconic acid, vinylsulfonic acid, (meth) allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, 2 −
(Meth) acryloylethanesulfonic acid, 2- (meth)
Acryloylpropanesulfonic acid and alkali metal salts and ammonium salts of these monomers; N, N-dimethylaminoethyl (meth) acrylate and its quaternary products; (meth) acrylamide, N, N-dimethyl (meth) ) Acrylamide, 2-hydroxyethyl (meth) acrylamide, diacetone (meth) acrylamide, N
-(Meth) acrylamides such as isopropyl (meth) acrylamide and (meth) acryloylmorpholine, and derivatives of these monomers; hydroxyalkyl such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate (Meth) acrylates; polyalkylene glycol mono (meth) acrylates such as polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, methoxypolyethylene glycol mono (meth) acrylate, and methoxypolypropylene glycol mono (meth) acrylate; N -Vinyl-2-pyrrolidone,
N-vinyl monomers such as N-vinyl succinimide;
N-vinylamide monomers such as vinylformamide, N-vinyl-N-methylformamide, N-vinylacetamide, N-vinyl-N-methylacetamide; vinyl methyl ether and the like.

The preferred form of the ethylenically unsaturated monomer is a nonionic group and / or a sulfonic acid (salt).
And an ethylenically unsaturated monomer having a group, for example, 2- (meth) acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2- (meth) acryloylpropanesulfonic acid,
(Meth) acrylamide, hydroxyalkyl (meth)
Acrylate, methoxypolyethylene glycol mono (meth) acrylate and the like can be exemplified. In addition, a particularly preferred embodiment includes an ethylenically unsaturated monomer having a polyoxyalkylene group. When the ethylenically unsaturated monomer in these forms is used, the water absorption of the water-absorbent resin (a) with respect to alkaline water is improved, but it is particularly preferable to use methoxypolyethylene glycol mono (meth) acrylate.

When two or more ethylenically unsaturated monomers are used in combination as the monomer components forming the water-absorbent resin (a), the total amount of the monomer components forming the water-absorbent resin (a) is 100%. It is preferable that the proportion of the ethylenically unsaturated monomer having a nonionic group and / or sulfonic acid (salt) group is 1% by weight or more based on the weight%. When the amount is less than 1% by weight, the effect of water absorption due to the formation of an ethylenically unsaturated monomer having a nonionic group and / or a sulfonic acid (salt) group may be reduced. More preferably, it is at least 10% by weight.

The combination when two or more of the above ethylenically unsaturated monomers are used in combination is not particularly limited. For example, a combination of an alkali metal (meth) acrylate such as sodium acrylate and acrylamide, )
A combination of an alkali metal acrylate and methoxypolyethylene glycol mono (meth) acrylate is preferred.

The polymerization method for producing the water-absorbent resin (a) and additives such as an initiator used for the polymerization are not particularly limited, and the polymerization can be carried out by a commonly used method. . The weight-average molecular weight, shape, average particle size, and the like of the water-absorbent resin (a) thus obtained may be appropriately set according to the composition of the hydraulic-mixture-adhesion-inhibiting paint, the pH of alkaline water, the working environment, and the like. Well, it is not particularly limited. For example, the average particle size is 30 to 8
It is preferably 00 μm. When it exceeds 800 μm, when the water-absorbent resin (a) is mixed with the solvent solution of the binder resin (b), the particles of the water-absorbent resin (a) are likely to sink due to too large particles,
If it is less than 30 μm, the particles of the water-absorbent resin (a) are too small, so that the particles tend to be scattered as fine powder, which may make handling difficult. More preferably, 30 to
600 μm, more preferably 30 to 400 μm
It is.

The binder resin (b) having an acid value of less than 15 mgKOH / g, which constitutes the paint for suppressing adhesion of a hydraulic admixture of the present invention, will be described. The acid value used in the present invention is 1
Binder resin (b) of less than 5 mgKOH / g is
(1) an acid value of less than 15 mgKOH / g, (2) a binder having a function of fixing the water-absorbent resin (a) to the substrate, and (3) a solvent which dissolves in the solvent (c). For example, although not particularly limited, for example, (meth) acrylate copolymer, polyurethane, polyester, polycarbonate; styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene /
Thermoplastic elastomers such as butylene-styrene block copolymer (SEBS), styrene-ethylene / propylene-styrene block copolymer (SEPS), and styrene-isoprene-styrene block copolymer (SIS); One or a mixture of two or more can be used.

The binder resin (b) having an acid value of less than 15 mgKOH / g is applied to, for example, a steel sheet pile and cast into the ground, and then, when the cement-based ground is improved by a column jet method or the like, particularly from the time of casting. If the period until ground improvement is long,
Binder resin (b) having an acid value of less than 15 mgKOH / g
If the hydrophilicity of the oil is high, the hydraulic admixture adhesion inhibitory layer formed on the substrate surface swells due to groundwater or moisture in the ground before the soil improvement, and the substrate surface / hydraulic admixture adhesion inhibitory layer When the high-pressure cement is sprayed by the column jet method to the place where the adhesive strength of the cement is reduced, the hydraulic admixture adhesion suppressing layer peels off from the surface of the base material such as steel sheet pile, and the hydraulic admixture of the cement or the like is removed. The material directly adheres to the surface of the base material such as steel sheet pile, and the ability to prevent the adhesion between the hydraulic admixture and the base material surface is reduced.

In the present invention, the acid value of the binder resin (b) having an acid value of less than 15 mgKOH / g must be less than 15 mgKOH / g in order to lower the hydrophilicity, and is less than 13 mgKOH / g. More preferably, it is less than 10 mgKOH / g, most preferably less than 5 mgKOH / g.

The glass transition temperature of the binder resin (b) having an acid value of less than 15 mgKOH / g is not particularly limited, but the adhesiveness to the surface of the substrate and the hydraulic miscibility when the substrate is embedded in the soil. It is preferable to have a glass transition temperature in the range of -20 ° C to 120 ° C from the viewpoint of achieving both the toughness of the material adhesion suppressing layer. When the glass transition temperature is −20 ° C. or lower, the hydraulic admixture adhesion suppressing layer becomes easily sticky,
In particular, when the coated substrates are left standing after being stacked, blocking may occur. Further, since the strength of the hydraulic mixture adhesion suppressing layer is insufficient, the substrate is easily peeled off when the substrate is buried in the soil. For this reason, the glass transition temperature is more preferably 0 ° C. or higher. Further, when the glass transition temperature exceeds 120 ° C., the hydraulic mixture adhesion suppressing layer becomes too hard, and the adhesion and flexibility to the base material become poor. Water absorbent resin (a)
Easily fall off. From this, it is more preferable that the glass transition temperature is 100 ° C. or less, and between 0 ° C. and 20 ° C., and between 20 ° C. and 100 ° C., respectively, when the softening component and the shape maintaining component have a glass transition temperature. Good balance is more preferable.

The glass transition temperature can be measured by differential scanning calorimetry (DSC).
C220C (trade name, manufactured by Seiko Denshi Kogyo KK) can be used in a nitrogen atmosphere according to "JIS K 7121 Plastic transition temperature measuring method". The condition of the specimen is adjusted according to JIS standard 3.
(3).

The weight average molecular weight (Mw) of the binder resin (b) having an acid value of less than 15 mgKOH / g is not particularly limited, but is preferably in the range of 30,000 to 300,000, and more preferably in the range of 50,000 to 200,000.
By using the resin having the above-mentioned weight average molecular weight, it is easy to balance the toughness and the water resistance of the hydraulic admixture adhesion suppressing layer.

In the present invention, the acid value is 15 mgKOH /
The binder resin (b) less than g is preferably a water-insoluble resin. By using such a binder resin (b), for example, as described above, when performing cement-based ground improvement such as the column jet method, especially when the period from casting to ground improvement is long, groundwater or ground Adhesion is further improved due to improved water resistance of the hydraulic admixture adhesion suppressing layer against moisture and the like, and the hydraulic admixture adhesion suppressing layer is more reliably prevented from peeling off from the substrate surface. It becomes possible. In the present invention, as the water-insoluble resin, a (meth) acrylate copolymer and / or a thermoplastic elastomer can be suitably used.

For the above water-insoluble resin, the water-insolubility can be evaluated by, for example, the weight reduction rate of the resin in the following solubility test. That is, the solubility in water of the water-insoluble resin that can be preferably used in the present invention,
The dried coating film having a constant weight (X) is immersed in ion-exchanged water at room temperature (20 ° C.) for 24 hours.
Y / X ≧ 0 (0 ° C. × 24 hr)
0.9. Y / X is preferably 0.95, and most preferably 1.

The solvent (c) that constitutes the paint for suppressing the adhesion of a hydraulic admixture of the present invention is not particularly limited as long as it is a known solvent used for ordinary paints and the like, and examples thereof include methanol, ethanol and isopropyl alcohol. Alcohols such as benzene and toluene; ketones such as acetone and methyl ethyl ketone; ethyl acetate;
One or more of aliphatic esters such as butyl acetate, ethylene glycol derivatives such as ethylene glycol and ethylene glycol monomethyl ether, and propylene glycol derivatives such as propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate. . In the present invention, the solvent (c)
Alternatively, a solvent contained in the binder resin (b) can be used.

Among the above-mentioned solvents (c), it is preferable to use a solvent having a boiling point, safety and the like suitable for application to the substrate surface. If a solvent having a low boiling point is selected, it has a quick drying property, and a hydraulic admixture adhesion suppressing layer can be formed in a short time, so that a thick coating can be easily performed.If a solvent having a high boiling point is selected, the drying speed can be reduced. Adjustment can make workability in field work such as summertime preferable. By using the solvent (c) in this manner, there is no swelling due to water absorption of the water-absorbent resin (a) generated when a medium containing water is used,
Since the gel is not formed, the coating operation is facilitated, and one of the functions and effects of the present invention is exhibited. In addition, when a highly volatile solvent such as methyl ethyl ketone or methanol is used, drying is performed in about 10 minutes, and drying is performed much faster than when water is used as a medium. And the time required for the work or the time required for application to the substrate surface can be significantly reduced.

In addition to the above-mentioned essential components, other paints such as other resins, pigments, various stabilizers, various fillers and the like may be added to the paint for suppressing the adhesion of the hydraulic admixture of the present invention, in addition to the above-mentioned essential components. It may or may not contain the additive (d). For example, for the purpose of coloring, a pigment is mixed, or various additives for other applications are mixed as necessary, so that it is easy to determine that the hydraulic mixture adhesion suppressing layer is formed. Or you may.

The essential components, that is, the water-absorbent resin (a), the binder resin (b) having an acid value of less than 15 mgKOH / g, and the solvent (c), based on 100% by weight of all the components constituting the paint for suppressing adhesion of the hydraulic admixture of the present invention. The weight ratio of the total amount is preferably 50% by weight or more with respect to 100% by weight of the paint for suppressing adhesion of a hydraulic admixture. 5
If it is less than 0% by weight, the function and effect of the present invention may be impaired. It is more preferably at least 70% by weight, particularly preferably at least 80% by weight.

The weight ratio of each component in the paint for inhibiting the adhesion of a hydraulic admixture of the present invention is not particularly limited, but, for example, in order to ensure the action and effect of the paint for inhibiting the adhesion of a hydraulic admixture of the present invention. Is the water-absorbent resin (a)
60% by weight, 10-70% by weight of the binder resin (b) having an acid value of less than 15 mgKOH / g, and 5% by weight of the solvent (c).
Preferably, the amount of the other additive (d) is 0 to 50% by weight. More preferably, the water-absorbent resin (a) is 10 to 50% by weight and has an acid value of 15 mgKOH /
less than 10 g by weight of the binder resin (b),
The solvent (c) is 10 to 60% by weight, and the other additive (d) is 0 to 30% by weight.

The paint for suppressing adhesion of a hydraulic admixture of the present invention comprises:
By applying to the surface of the base material, a hydraulic admixture adhesion-suppressing layer is formed and the function and effect thereof are exhibited, but the application to the surface of the base material means that the hydraulic admixture of the present invention is adhered to the surface of the base material. It is possible to form a hydraulic admixture adhesion-suppressing layer by applying a control paint, or to apply a hydraulic admixture adhesion-suppressing paint of the present invention to form a hydraulic admixture adhesion-suppressing layer. This means that the mixture is attached to the surface of the base material such that the adhesion-suppressing layer is on the outside.

The method of applying the paint for suppressing adhesion of a hydraulic admixture of the present invention is not particularly limited. For example, a commonly used method of applying a paint can be used.
The paint may be applied using a brush, a roller, or the like, or may be applied by spraying using a spray device such as a lithirigan.
In addition, it is applied to the surface of the substrate or the sheet so as to correspond to a portion (place) where the adhesion between the surface of the substrate and the hydraulic admixture is to be prevented, but may be applied to other portions. The coating amount is not particularly limited, and is, for example, 40 to 700 g /
m ² is preferable. If the amount is less than 40 g / m ² , the function and effect of the present invention may not be sufficiently exerted. If the amount exceeds 700 g / m ² , the time until application and drying becomes long, which is economically disadvantageous. There is a possibility that. More preferably, it is 50 to 500 g / m ² , still more preferably 70 to 300 g / m ² .
In addition, the surface of the base material has been subjected to other surface treatment,
An undercoat or the like may be painted.

In the case where the paint for suppressing adhesion of a hydraulic admixture of the present invention is applied to a sheet and the sheet is attached to the surface of a substrate,
For example, sheets such as cloth, paper, and plastic film can be used. In this case, it is preferable to apply a pressure-sensitive adhesive on the back surface of the sheet, since it is easy to attach the sheet to the surface of the base material. The pressure-sensitive adhesive is not particularly limited, for example,
A generally used acrylic pressure-sensitive adhesive may be used, and grease oil or the like is preferably used because it is easy to peel off and re-attach when erroneously applied at a construction site.

The hydraulic-mixture-adhesion-inhibiting coating material of the present invention forms a hydraulic-mixture-adhesion-inhibition layer on the substrate surface. ), A water resistance imparting agent layer can be formed by applying a water resistance imparting agent. Thus, for example, when the base material is stored, the water-absorbent resin (a) swells by absorbing rain, night dew, moisture from the ground, etc., and the effect is sufficiently enhanced in the hydraulic admixture. And it is possible to further suppress a decrease in adhesion between the surface of the base material and the hydraulic admixture adhesion suppressing layer. That is, in the construction of the ground foundation structure, etc., the adhesion of the hydraulic admixture adhesion suppressing layer is maintained (prevention of peeling) and the water-absorbent resin (a) is made Water absorption and swelling by the alkaline water in the mixture can be more sufficiently compatible.

As the above-mentioned water-resistance imparting agent, a water-resistance imparting agent layer capable of preventing the water-absorbing resin (a) in the hydraulic admixture adhesion suppressing layer from swelling before exerting its function is formed. The binder resin (b) is not particularly limited as long as it can be used. For example, the above-mentioned binder resin (b); a conventionally known water repellent such as a wax or a silicone-based water repellent can be used. Further, as a method of applying the water resistance imparting agent,
It can be carried out in the same manner as in the method for applying the hydraulic mixture adhering suppression paint described above. In this case, about 50 g / m ² is sufficient as the adhesion amount of the water resistance imparting agent, but is not particularly limited.

When the paint for suppressing the adhesion of a hydraulic admixture of the present invention is used, the above-mentioned functions and effects are exerted. However, since the hydraulic admixture is embedded in the hydraulic admixture, In the case of a buried product obtained by applying a hardening mixture adhesion suppressing paint, the hydraulic mixing agent adhesion suppressing layer of the hydraulic mixture adhesion suppressing paint of the present invention is formed on the substrate surface of the buried object. The present invention is effective for improving the efficiency in various foundation works and the like by exerting the effects of the invention. Such an embedded object is also one of the present invention.

Further, there is provided a method for preventing adhesion of a buried object, which suppresses the adhesion between the substrate surface of the buried object and the hydraulic admixture,
Similarly, the method for preventing adhesion of a hydraulic admixture of the present invention and / or the method for preventing adhesion of a buried object using the buried object of the present invention exerts the effect of the present invention to improve the efficiency in various foundation works and the like. It is effective to improve. Such a method for preventing adhesion of a buried object is also one of the present invention.

The above-mentioned buried material means a substrate buried in the hydraulic admixture, and the state thereof is as follows: (1) a substrate in a state before being buried in the hydraulic admixture, (2) Substrates embedded in the hydraulic admixture, (3) Substrates pulled out of the hydraulic admixture, and the like. That is, the above-mentioned buried object means the base material in these states. Further, it is not necessary that the entire buried object be buried in the hydraulic mixture, and it is sufficient that at least a part is buried in the hydraulic mixture.

The shape, length, material and the like of the above-mentioned buried object are not particularly limited. For example, H-section steel,
Columnar substrates such as I-beams, steel columns, concrete piles, poles, etc.
Examples include a cylindrical columnar base such as a tubular pile (hollow pile), a steel sheet pile (sheet pile) or a corrugated sheet which is a long plate-like pile, and among these, a steel sheet pile, an H-shaped steel, It is preferably a steel pipe or a cylindrical columnar substrate.

In the present invention, the buried object constitutes a structure such as a ground foundation structure such as a retaining wall or a base. Such a structure is constituted by at least a buried object and a hydraulic admixture. Examples of the hydraulic admixture include various concretes and various mortars, but are not particularly limited. Examples of the form of such a hydraulic admixture include an admixture containing water and a material such as cement that hardens with water, and more specifically, water and cement such as Portland cement or mixed cement. And, if necessary, an admixture containing an aggregate such as sand or gravel, a cement admixture, an admixture, a reinforcing material, and the like. In this case, the types and combinations of cement, aggregate, admixture, admixture, reinforcing material, and the like contained in the hydraulic admixture, that is, the composition of the hydraulic admixture are not particularly limited.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a conceptual cross-sectional view of a part of a buried object 1 embedded in a hydraulic mixture 2 in the vicinity of a substrate surface. In (1) of FIG. 1, the hydraulic admixture 2 contains alkaline water and is in a state where hydration is not progressing, and the hydraulic admixture adhesion suppressing layer 3 is in a state where the alkaline water is not sufficiently absorbed. In (2), as the hydration of the hydraulic admixture 2 progresses, the water-absorbent resin (a) 3a in the hydraulic admixture adhesion suppressing layer 3 also undergoes water-absorption swelling, and (3) In the above, the hydration of the hydraulic admixture 2 is completed so that no alkaline water is contained, and the water-absorbing resin (a) 3a that has swollen and absorbed is dried and hydrated with the hydraulic admixture adhesion suppressing layer 3. In this state, a gap is formed between the hydraulic mixture 2 and the hydraulic mixture 2. In this way, the gap formed as shown in FIG. 1C suppresses the adhesion between the substrate surface and the hydraulic admixture 2, and the embedded object 1 is moved to the hydraulic admixture 2.
Can be easily removed from the hydrate. Also,
Even when the embedded object 1 is removed from the hydraulic admixture 2 in the state shown in (2), the water-swelled hydraulic admixture adhesion-suppressing layer 3 exists between the embedded object 1 and the hydraulic admixture 2. Thereby, it can be easily performed.

FIGS. 2 (1) to 2 (3) exemplify a ground substructure formed in the ground 4. FIG. The ground substructure of FIG. 2A is formed of the hydraulic admixture 2 and the buried object 1, and the adhesion of the hydraulic admixture is suppressed on the base material surface of the buried object 1 prior to the formation of the ground substructure. A hydraulic paint is applied to form a hydraulic mixture adhesion suppressing layer 3. In this case, as a method of forming the ground foundation structure, for example, the ground 4
After the drilling hole is formed and the buried object 1 is loosely inserted, the hydraulic mixture 2 is poured around the buried object 1, or the hydraulic mixture 2 is placed in the drilling hole. This can be done by embedding 1. In such a ground foundation structure,
An operation of removing the buried object 1 from the hydraulic admixture 2 and its hydrate is performed.

The ground foundation structure shown in FIGS. 2 (2) and 2 (3) is formed of a hydraulic admixture 2 and a tubular buried object 1a.
Prior to the formation of the ground foundation structure, a hydraulic admixture adhesion-suppressing paint is applied to the upper surface (pile head) of the inner surface of the buried object 1a to form a hydraulic admixture adhesion-suppressing layer 3. ing. In this case, as a method of forming the ground foundation structure, for example, the hydraulic admixture 2 placed in the excavation hole is used.
By embedding the buried object 1a in the pit.
In such a ground foundation structure, after hydration of the hydraulic admixture 2, an operation of separating the hydrate of the hydraulic admixture 2 from the pile head 2a on the inner surface of the buried object 1a is performed. It will be provided for construction. 2 (1) to 2 (3) show a state in which the water-absorbent resin (a) in the hydraulic mixture adhesion suppressing layer 3 has swollen by water.

According to the present invention, in the embodiment shown in FIGS. 2A to 2C, when performing cement-based ground improvement such as a column jet method, particularly when the period from casting to ground improvement is long, FIG. 1 (1) to FIG.
By acting as in (3), the work of pulling out the buried object from the hydraulic admixture or its hydrate can be performed efficiently and easily.

In the embodiment shown in FIGS. 1 and 2, since the hydraulic admixture adhesion suppressing layer 3 gradually absorbs water from the surface, the degree of swelling of the water-absorbent resin (a) 3a is reduced by the hydraulic admixture adhesion suppressing layer. 3 shows that the water-absorbent resin (a) 3a existing near the surface of the base material gradually absorbs and swells. Become. That is, in the present invention, the water-absorbent resin (a) 3 present in the hydraulic admixture
When a absorbs and swells, a may be in a partially swollen state or the whole may be in a swollen state. The same applies to the following embodiments and the like.

In the various structures as described above, when the buried object is pulled out of the hydraulic mixture, a cavity (hole) having the same shape as that of the buried object is formed in the structure.
The cavity can be used, for example, as a drain, electric wire,
It can be used as a pipe for inserting a gas pipe, a water pipe, or the like. In addition, the various structures may be bases for installing road signs and the like. That is, after the structure is formed using the embedded object of the road sign desired to be installed, the embedded object is pulled out and the road sign is inserted, whereby the road sign can be installed.

As an embodiment of the present invention, after digging the ground and installing or constructing various structures below the ground surface,
A method for building an underground structure by backfilling with a backfill material in which a cement-based or lime-based solidified material is mixed, wherein between the backfill material and a member that constitutes the retaining wall or the retaining wall,
A method of constructing an underground structure in which a hydraulic mixture adhesion suppressing layer formed by the hydraulic mixture adhesion suppressing paint of the present invention is present. Such a method of constructing an underground structure is one of preferred embodiments of the present invention.

In the above method for constructing an underground structure, for example, a trench is excavated as a preliminary step, but prior to the excavation, along the outer periphery of the excavation area to prevent the ground outside the excavation area from loosening or collapse. An earth retaining wall made of steel sheet pile or the like will be constructed. After that, various underground structures are constructed inside the trench, the cut-out portion is backfilled with backfill material, and finally the retaining wall is removed by drawing or the like. here,
Since the hydraulic admixture adhesion-suppressing layer exists between the earth retaining wall or a member constituting the earth retaining wall and the backfill material, the soil absorbing wall or the earth retaining wall is swollen by the water-absorbent resin (a) swelling. Adhesion between the constituent member and the backfill material can be prevented, and furthermore, the binder resin (b) can prevent the hydraulic admixture adhesion suppression layer on the retaining wall or the member constituting the retaining wall from peeling off. As a result, it is possible to improve the efficiency of foundation work and the like even in such an underground structure building method.

The outline of the method of building the underground structure will be described with reference to FIG. In FIG. 3, the state of the foundation work in the construction of the underground structure 5 is shown as a conceptual sectional view. First, the hydraulic mixture adhesion suppressing layer 3 is formed on the base material surface of the construction member 1b such as a steel sheet pile with the hydraulic mixture adhesion suppressing paint of the present invention, and the construction member 1b is built into the ground 4. After forming the earth retaining wall, the ground 4 between the earth retaining walls is excavated to form a groove. Thereafter, the underground buried object 5 is installed in the excavated ground 4 and backfilled with the cement-based backfill material 2b, and further, a backfill material 6 such as soil used as necessary.
After that, the construction member 1b such as a steel sheet pile on which the hydraulic admixture adhesion suppressing layer 3 is formed is pulled out and removed. As described above, the hydraulic admixture adhesion suppressing layer 3 formed on the construction member 1b such as a steel sheet pile allows the construction member 1b such as the steel sheet pile constituting the retaining wall to be easily buried in the ground or from the ground. It can be pulled out and removed.

In an embodiment of the present invention, the hydraulic mixture is cast using a movable mold, and after the hydraulic mixture is cured, the movable mold is placed on the surface of the cured hydraulic mixture. A method for releasing a movable mold that is slid along, wherein a hydraulic admixture is formed between the movable mold and the hydraulic admixture by the hydraulic admixture adhesion-suppressing paint of the present invention. There is a method of releasing a movable mold form in which a suppression layer is present.
Such a method of releasing the movable mold form is one of preferred embodiments of the present invention.

In the method for releasing the movable formwork, for example, when constructing a concrete structure which extends long in the horizontal or vertical direction, such as a chimney, a pier or a tunnel, or a sewer, the hydraulic admixture is unit lengthwise. In order to construct the concrete, concrete is cast using a movable formwork. Then, after a certain level of strength is obtained, the movable formwork is slid over the surface of the hardened concrete to the place where the next concrete is to be poured, and the mold is released. Casting is carried out, and concrete is constructed to construct a concrete structure. Here, since the hydraulic admixture adhesion suppressing layer exists between the movable mold and the hydraulic admixture, the adhesion between the mold and the ground is prevented, and It can prevent peeling of the hydraulic admixture adhesion suppression layer,
The movable mold can be easily slid.

The movable mold is not particularly limited as long as it retains its shape until the hydraulic admixture exhibits a predetermined strength, and after curing, slides the surface of the cured product and releases the mold. However, examples thereof include a form for a slip form method, a form for a jump form method, a machine used for various shield methods, and other sliding form forms.

The outline of the method of releasing the movable mold form will be described with reference to FIG. FIG. 4 is a conceptual cross-sectional view showing the construction of the hydraulic admixture structure. First, using the movable mold 1c on which the hydraulic admixture adhesion suppressing layer 3 is formed, the movable mold 1c is slid over the existing hydraulic admixture 2c which has been cast and cured. , A new hydraulic mixture 2d is poured into the newly created space. As described above, the adhesion between the movable mold and the hydraulic admixture is suppressed by the hydraulic admixture adhesion suppressing layer 3 in the movable mold 1c, and the swollen water-absorbent resin (b) has a wetting effect. Since the movable mold can be easily slid by exerting, it becomes easy to construct the hydraulic admixture structure by inheriting the hydraulic admixture.

[0060]

EXAMPLES The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples. In the examples, “parts” means “parts by weight” unless otherwise specified.

Production Example 1 A water-absorbing resin (a) was prepared by the following method. That is,
A kneader equipped with a table-top jacket having a capacity of 1.5 L and provided with a thermometer and a blade (stirring blade), the inner surface of which is lined with ethylene trifluoride, is used as a reactor, and methoxypolyethylene glycol methacrylate (molecular weight) is used in the reactor. 512) 60.18 g, methacrylic acid (molecular weight 86.09) 3.76 g, sodium methacrylate (molecular weight 108) 210.69 g, polyethylene glycol diacrylate 1.3 g as a cross-linking agent, and ion-exchanged water 352 as a solvent .37 g was charged. The proportion of the crosslinking agent in the monomer component is 0.14 mol%.

By flowing warm water of 50 ° C. through the jacket, the above aqueous solution is stirred under a stream of nitrogen gas for 50 hours.
Heated to ° C. Then, 2,2'-azobis- (2-amidinopropane) dihydrochloride (molecular weight 2
71.27, Chemical product V-50) manufactured by Wako Pure Chemical Industries, Ltd.
After adding 10 g of a 1.6% by weight aqueous solution and stirring for 10 seconds, the stirring was stopped and allowed to stand. The ratio of the polymerization initiator to the monomer component is 0.2 mol%.

The polymerization reaction was started immediately after the addition of the polymerization initiator, and the internal temperature reached 100 ° C. (peak temperature) after 90 minutes. Thereafter, the contents were aged for an additional 30 minutes while flowing hot water at 80 ° C. through the jacket. Thus, a hydrogel was obtained. After completion of the reaction, the hydrogel was disintegrated by rotating a blade until the hydrogel became fine, and then the hydrogel was taken out by inverting the reactor. The obtained hydrogel was dried at 140 ° C. for 3 hours using a hot-air circulation dryer. After drying, the dried product was pulverized using a desktop simple pulverizer (manufactured by Kyoritsu Riko Co., Ltd.). Thereby, the average particle diameter of 160
As a result, a water absorbent resin (1) having a thickness of μm was obtained.

Production Example 2 Among the binder resins (b) having an acid value of less than 15 mgKOH / g, an acrylic polymer was prepared as a (meth) acrylate copolymer by the following method. That is, a tank reactor having a capacity of 50 L equipped with a thermometer and a dropping device,
Acrylic acid 0.04kg, ethyl acrylate 2.3k
g, methyl methacrylate 0.66 kg, polymerization initiator 2,2'-azobis- (2,4-dimethylvaleronitrile) 12 g, and solvent methyl alcohol 3 k
g. In addition, acrylic acid 0.09 was added to the dropping device.
kg, 2.2 kg of methyl acrylate, 4.71 kg of methyl methacrylate, 26 g of 2,2′-azobis- (2,4-dimethylvaleronitrile), and 7 kg of methyl alcohol were charged.

The above methyl alcohol solution was heated to 65 ° C. with stirring in a nitrogen gas atmosphere, and reacted for 20 minutes. Thereby, the polymerization rate of the content was adjusted to 70%. Subsequently, while maintaining the internal temperature at 65 ° C., the above mixed solution was dropped uniformly from the dropping device over 2 hours. After completion of the dropwise addition, the content was aged at 65 ° C. for another 3 hours. After the completion of the reaction, a 33% by weight methyl alcohol solution of the acrylic polymer (1) was obtained by mixing the content with 10 kg of methyl alcohol.

The obtained acrylic polymer (1) had a weight average molecular weight of 120,000 and an acid value of 12 mgKOH / g.
Met. As a result of differential scanning calorimetry of the acrylic polymer (1), the acrylic polymer (1)
It had two glass transition temperatures in the range of -80C to 120C. The acrylic polymer (1) was immersed in ion-exchanged water at room temperature for 24 hours, filtered and dried, and the ratio of the weight before immersion (X) to the weight after immersion and drying (Y) (Y / X) ) Was 0.96, and the acrylic polymer (1) was water-insoluble.

Comparative Production Example 1 A comparative acrylic polymer (binder resin) was prepared by the following method. That is, 0.45 k of acrylic acid was placed in a 50 L tank reactor equipped with a thermometer and a dropping device.
g, 2.4 kg of ethyl acrylate, 0.15 kg of methyl methacrylate, 2,2'-azobis-
12 g of (2,4-dimethylvaleronitrile) and 3 kg of methyl alcohol as a solvent were charged. Also, 1.05 kg of acrylic acid, 2.25 kg of methyl acrylate, 3.70 kg of methyl methacrylate,
2'-azobis- (2,4-dimethylvaleronitrile)
A mixed solution consisting of 26 g and 7 kg of methyl alcohol was charged.

The above methyl alcohol solution was heated to 65 ° C. with stirring in a nitrogen gas atmosphere, and reacted for 20 minutes. Thereby, the polymerization rate of the content was adjusted to 74%. Subsequently, while maintaining the internal temperature at 65 ° C., the above mixed solution was dropped uniformly from the dropping device over 2 hours. After completion of the dropwise addition, the content was aged at 65 ° C. for another 3 hours. After the reaction was completed, 10 kg of methyl alcohol was mixed with the content to obtain a 33% by weight methyl alcohol solution of the comparative acrylic polymer (1).

The obtained comparative acrylic polymer had a weight average molecular weight of 130,000 and an acid value of 113 mg KOH /
g. As a result of performing differential scanning calorimetry on the comparative acrylic polymer (1), the comparative acrylic polymer (1) had two glass transition temperatures in the range of -80 ° C to 120 ° C. The comparative acrylic polymer (1) was immersed in ion-exchanged water at room temperature for 24 hours, filtered and dried, and the ratio (Y) of the weight before immersion (X) to the weight after immersion and drying (Y) (Y / X) was 0.55, and the comparative acrylic polymer (1) was not water-insoluble.

Example 1 100 parts of the water-absorbent resin (1) obtained in Production Example 1, 303 parts of the acrylic polymer (1) obtained in Production Example 2,
After well mixing 397 parts of butanone (methyl ethyl ketone), the mixture is applied to a square steel test plate (one side) having a thickness of 3 mm and a side of 70 mm at a coating amount of 1 kg / m ² and dried at room temperature for 18 hours. A 50 mm × 50 mm jig having the shape shown in FIG. 5 is applied on the coating film, and an epoxy-based adhesive is applied to the entire surface of the jig on the non-applied surface and adhered to the applied surface. An epoxy-based adhesive was applied in a width of 10 mm each and adhered (that is, the central 30 mm × 50 mm portion was not adhered). The coated steel plate (with jig) for tensile test (1) prepared as described above was immersed in ion-exchanged water for 24 hours under the condition of 20 ° C, and then the base material of the coating film (steel plate) ) Was measured. As a result, the wet adhesion strength of the coated steel sheet (1) for tensile test using the acrylic polymer (1) was 78 N /
cm ² , which was sufficiently strong.

Example 2 In Example 1, KRATON D-11 was used as a thermoplastic elastomer in place of the acrylic polymer (1).
01 (Styrene-butadiene-styrene block copolymer, acid value 0, manufactured by Kraton Polymer Japan) 100
Example 1 was repeated except that 300 parts of toluene was used instead of 303 parts of 2-butanone (methyl ethyl ketone).
The same operation as described above was performed, and the wet adhesion strength of the coated steel sheet (2) for a tensile test was measured. As a result, the above-mentioned KRATO
The wet adhesion strength of the coated steel sheet (2) for tensile test using ND-1101 was 118 N / cm ² , which was sufficiently strong. In addition, the above KRATON
After immersing D-1101 in room temperature ion exchange water for 24 hours,
The ratio (Y / X) of the weight (X) before immersion when filtered and dried and the weight (Y) after immersion drying was 1.00, and the KRATON D-1101 was insoluble in water.

Comparative Example 1 The same operation as in Example 1 was carried out except that the acrylic polymer for comparison (1) was used instead of the acrylic polymer (1), and the wet adhesion of the coated steel sheet for comparative tensile test (1) was performed. The strength was measured. As a result, the wet adhesion strength of the coated steel sheet (1) for the comparative tensile test using the comparative acrylic polymer (1) was 4.9 N / cm ² ,
It was very weak.

Examples 3 and 4 and Comparative Examples 2 and 3 The mixture of the water-absorbent resin (1), each binder resin and the solvent obtained in Examples 1 and 2 and Comparative Example 1 was coated to a thickness of 3 m.
m, width 30mm, length 300mm steel plate 1kg / m ²
, And dried at room temperature for 18 hours to prepare steel plates (1) and (2) for cement friction cut test and steel plate (1) for comparative cement friction cut test.

Next, a polypropylene cylinder having a diameter of 80 mm and a height of 250 mm was filled with a cement milk having the composition shown in Table 1 to a height of 150 mm, and the steel plates for cement friction cut test (1) and (2) were filled therein. ,
The steel plate (1) for the comparative cement friction cut test and the steel plate to which nothing was applied were set up vertically, and the room temperature (approximately 20
゜ C) and cured for 7 days. After curing for 7 days,
Using a 0N spring only, it was manually pulled out, and the pulling force was measured. Table 2 summarizes the results.

[0075]

[Table 1]

[0076]

[Table 2]

[0077]

The paint for suppressing the adhesion of a hydraulic admixture of the present invention has the above-mentioned constitution, so that the coating operation is facilitated and the effect of suppressing the adhesion between the substrate surface and the hydraulic admixture is provided. The column-jet method is used in construction and construction works such as ground foundation structures in the field of construction and civil engineering due to the excellent adhesion of the hydraulic admixture adhesion suppression layer formed on the surface of the base material. When performing cement-based ground improvement, such as when the period from casting to ground improvement is long, especially when placing steel sheet pile as the base material on soft ground with a lot of groundwater, etc. It can be suitably applied in order to suppress the adhesion with the hard mixture. Further, the use of the embedded object of the present invention and the method for preventing adhesion of an embedded object of the present invention are effective for suppressing the cost for foundation work and the like and for quickly completing the work.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view for explaining the function and effect of a hydraulic mixture adhesion suppressing layer according to an embodiment of the present invention.

FIG. 2 is a conceptual cross-sectional view illustrating an embodiment of the present invention, and is a conceptual cross-sectional view illustrating a ground foundation structure using a buried object formed by applying a paint for suppressing adhesion of a hydraulic admixture of the present invention. .

FIG. 3 is a conceptual cross-sectional view illustrating an embodiment of the present invention, and is a conceptual cross-sectional view for explaining a method of building an underground structure.

FIG. 4 is a conceptual cross-sectional view illustrating an embodiment of the present invention, and is a schematic cross-sectional view for explaining a method of releasing a movable mold.

FIG. 5 is a schematic view of a jig for a tensile test used when measuring the adhesion of the paint for suppressing adhesion of a hydraulic admixture of the present invention to a substrate surface.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Buried object 1a Tubular buried object 1b Construction members, such as steel sheet piles 1c Mobile formwork 2 Hydraulic admixture 2a Pile head 2b Cement-based backfill material 2c Existing hydraulic admixture 2d Newly cast Hydraulic admixture 3 Hydraulic admixture adhesion-suppressing layer 3a Water-absorbent resin (a) 3b Binder resin (b) having an acid value of less than 15 mgKOH / g 4 Ground 5 Underground burial 6 Soil or the like used as necessary Backfill material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Hattori 4-1-1 Koraibashi, Chuo-ku, Osaka-shi, Osaka F-term in Nippon Shokubai Co., Ltd. (Reference) 2D049 EA02 GD01 GD06 2D050 AA08 AA12 AA13 DA01 DA10 4J038 CB131 CB132 CC021 CC022 CE021 CE022 CG031 CG032 CG091 CG092 CG141 CG142 CG171 CG172 CH121 CH122 CH141 CH142 CH261 CH262 CK031 CK032 CK041 CK042 CP011 CP012 CP061 CP062 CP071 CP072 CQ001 CQ002 CQ011 DEQ002 002 001 002

Claims (5)

[Claims] 1. A water-absorbent resin (a) having an acid value of 15 mg KO
Hydraulic admixture adhesion-inhibiting paint comprising a binder resin (b) and a solvent (c) of less than H / g as essential components. A paint for suppressing the adhesion of a hydraulic admixture, characterized by suppressing the adhesion between the two. 2. The paint for suppressing adhesion of a hydraulic admixture according to claim 1, wherein the binder resin (b) having an acid value of less than 15 mgKOH / g is a water-insoluble resin. 3. An embedded object to be embedded in a hydraulic admixture, wherein the paint for suppressing adhesion of a hydraulic admixture according to claim 1 or 2 is applied. 4. A method for preventing adhesion of a buried object, which suppresses adhesion between a substrate surface of the buried object and a hydraulic admixture, wherein the paint for suppressing adhesion of a hydraulic admixture according to claim 1 or 2. as well as/
A method for preventing adhesion of a buried object, comprising using the buried object according to claim 3. 5. The method for preventing adhesion of a buried object according to claim 4, wherein the buried object is a steel sheet pile, an H-shaped steel, a steel pipe, or a cylindrical columnar substrate.