JP2003328359A - Adhesion prevention method and withdrawal method for temporarily buried object, and adhesion preventive material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesion prevention method for a temporarily buried object that can prevent adhesion between a set body of a hydraulic composition and a temporarily buried object such as an H-steel temporarily buried in the hydraulic composition, facilitate work of withdrawing the temporarily buried object from the set body of the hydraulic composition, improve the workability of the work, and reduce refuse. <P>SOLUTION: After an object 13 to be temporarily buried is coated with an adhesion preventive material 14 comprising a backing using aliphatic polyester as a raw material, and loosely inserted in an excavated hole cut in ground 11, a hydraulic composition is injected and hydrated (set) about the temporarily buried object 13 to form a hydraulic composition hydrate 2. Alternatively, after the temporarily buried object 13 coated with the adhesion preventive material 14 is buried in the hydraulic composition injected into the excavated hole, the hydraulic composition is hydrated (set) to form the hydraulic composition hydrate 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hardened product of a hydraulic composition such as a cement composition or the like, and a temporary buried product for the purpose of easily extracting a temporary buried product such as an H-shaped steel from a hardened product of the hydraulic composition. The present invention relates to a method for preventing adhesion of a temporary buried object, a method for pulling out a temporary buried object, and an adhesion preventive material for preventing adhesion with a temporary buried object.

[0002]

2. Description of the Related Art Generally, when constructing a ground foundation structure as a structure such as an earth retaining wall in the field of construction and civil engineering, after loosely inserting, for example, an H-shaped steel into an excavation hole, A hydraulic composition such as cement milk or fresh concrete is injected around the H-section steel to be hardened, or, for example, an H-section steel is embedded as a core material in the hydraulic composition injected into the drill hole ( After (driving), the hydraulic composition is cured. After the hardening of the hydraulic composition is completed, the H-section steel is desired to be pulled out and removed from the hardened product so as not to become an obstacle when redeveloping the underground in a later year.

However, the H-section steel and the hardened material of the hydraulic composition are firmly adhered to each other, and in order to remove the H-section steel after the completion of the work, the work of pulling out the H-section steel from the hardened material is required. Since a considerable amount of labor (tensile force) is required to overcome the adhesive strength (adhesive strength), equipment, cost, and days are required.

Therefore, as a method for easily performing the above-mentioned drawing work, for example, a method of coating H-section steel with a lubricant is used. As the method, for example, JP-A-7-2
Japanese Patent Publication No. 47549 discloses that a temporary embedding material is formed by coating a temporary embedding material with a bag-shaped lubricant made of a polymer sheet obtained by directly adhering a water-absorbent resin to a base material such as a woven fabric or a non-woven fabric. A method for reducing the frictional resistance force when pulling out has been proposed.

As described above, the method of coating the H-section steel with the lubricant obtained by fixing the water-absorbent resin to the base material such as the woven cloth or the non-woven cloth is the case where the surface of the H-section steel is treated with the surface treatment agent. As described above, there is no need to secure labor, time, place, etc. for heating, melting, and coating the surface treatment agent at the work site, and it is a very effective method for improving workability.

[0006]

However, in the above-mentioned conventional lubricants, the synthetic fibers such as polyester as the base material do not decompose over a long period of time, and the base material remains in the cured body of the hydraulic composition. In that case, there is a problem in that it will be left (embedded) in the underground ground as coarse dust. Also, damaged lubricants are not suitable for use and must be landfilled or incinerated. In addition, when it is landfilled, the above base material does not decompose or it takes a long time to decompose, so it is necessary to expand the disposal site. There is a nature.

Therefore, it is necessary to provide a method for easily withdrawing a temporary buried object such as an H-section steel from a hardened body of a hydraulic composition without causing such a problem in consideration of environmental protection. , Very meaningful.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a cured product of a hydraulic composition,
Preventing adhesion to a temporary buried object such as an H-shaped steel temporarily buried in the hydraulic composition, facilitating the work of pulling out the temporary buried product from the cured body of the hydraulic composition, and improving the workability of this work. An object of the present invention is to provide a method of preventing adhesion and a method of pulling out a temporary buried object and an adhesion preventive material that can be improved and can reduce dust.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, aliphatic polyester has excellent biodegradability in a hydraulic composition, and aliphatic polyester is used as a raw material. By coating the temporary embedding material with an anti-adhesion material having the base material used, it is possible to prevent adhesion between the temporary embedding material and the cured body of the hydraulic composition, and it is possible to reduce dust, The present invention has been completed by finding that it can alleviate dust pollution. Further, the inventors of the present application, by providing a resin layer containing a water-absorbent resin on the base material, facilitates the work of pulling out the temporary buried product from the cured product of the hydraulic composition, and the workability of this work It has been found that can be significantly improved.

That is, in order to solve the above-mentioned problems, the method for preventing the adhesion of a temporary embedding material according to the present invention includes a cured body of a hydraulic composition and a temporary embedding in the hydraulic composition, A method for preventing adhesion with a temporary embedding material that is pulled out from a cured body of the hydraulic composition after curing the composition, wherein the temporary embedding material is provided with a substrate using an aliphatic polyester as a raw material. It is characterized in that it is covered with a preventive material.

In order to solve the above-mentioned problems, the method of preventing adhesion of a temporary buried object according to the present invention further comprises, as the above-mentioned adhesion preventing material, an adhesion preventing material further comprising a resin layer containing a water-absorbent resin. It is characterized by using.

Further, in order to solve the above-mentioned problems, the method for preventing the adhesion of the temporary buried object according to the present invention covers the temporary buried object such that the resin layer is on the outside of the base material. It is characterized by that.

In order to solve the above-mentioned problems, a method for extracting a temporary buried product according to the present invention is to temporarily embed a temporary buried product in a hydraulic composition, and after hardening the hydraulic composition, the hydraulic composition. A method of extracting the temporary embedding material from a cured product of the material, the temporary embedding material being covered with an adhesion preventive material comprising a base material using an aliphatic polyester as a raw material, and temporarily embedding in a hydraulic composition. However, after curing the hydraulic composition, substantially only the temporary embedding material is extracted from the cured body of the hydraulic composition.

In the present invention, substantially withdrawing only the temporary embedding material from the cured body of the hydraulic composition means
It shows that the temporary embedding material is extracted from the cured body of the hydraulic composition without extracting the adhesion preventive material. That is, in the present invention, it is not necessary to pull out the anti-adhesion material from the cured body of the hydraulic composition, and in many cases, the adhesion prevention by the time of pulling out the temporary embedded material from the cured body of the hydraulic composition. The material, that is, the base material using the above-mentioned aliphatic polyester as a biodegradable base material as a raw material disappears or collapses. Therefore, substantially withdrawing only the temporary embedding substance from the cured body of the hydraulic composition means that the temporary embedding substance is not withdrawn alone for each adhesion preventive material but with it alone. Therefore, a component other than the material constituting the anti-adhesion material, such as water or soil attached during construction or extraction, may be attached to the temporarily buried object to be pulled out.
Further, when the above-mentioned anti-adhesion material is provided with a resin layer containing a water-absorbent resin, a hydrophobic lubricating layer, etc., the water-absorbent resin, the hydrophobic lubricant, or the like constituting these resin layers or hydrophobic lubricating layers, or the like. It does not matter even if a little of the component is attached.

In order to solve the above-mentioned problems, the anti-adhesion material according to the present invention is a cured product of a hydraulic composition and is temporarily embedded in the hydraulic composition. An adhesion preventive material for preventing adhesion with a temporary embedding material pulled out from a cured body of a hydraulic composition, comprising a base material using an aliphatic polyester as a raw material, and a resin layer containing a water absorbent resin. It is characterized by that.

In order to solve the above problems, the adhesion preventive material according to the present invention has an acid value of 15 m in the resin layer.
It is characterized by further containing an alkaline water-soluble resin in the range of gKOH / g or more and 500 mgKOH / g or less.

Further, the adhesion preventive material according to the present invention is characterized by further comprising a hydrophobic lubricating layer containing a hydrophobic lubricant in order to solve the above problems.

Further, in order to solve the above problems, the adhesion preventive material according to the present invention is provided with the resin layer at least on a surface which is an outer side when the temporary buried object is covered with the adhesion preventive material. It is characterized by being.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The method for preventing the adhesion of a temporary embedding material according to the present invention comprises a cured body of a hydraulic composition, and temporary embedding in the hydraulic composition. A method for preventing adhesion with a temporary embedding material that is pulled out from a cured body of a hard composition, wherein the temporary embedding material is an anti-adhesion material (covering material) including a base material using an aliphatic polyester as a raw material. This is a coating method. Further, the method for extracting a temporary buried product according to the present invention is a method for extracting a temporary buried product using the above-mentioned method for preventing adhesion of the temporary buried product, in which the temporary buried product is temporarily buried in the hydraulic composition, A method for extracting the temporary embedding material from a cured body of the hydraulic composition after curing the hydraulic composition, wherein the temporary embedding material is an anti-adhesive material provided with a substrate using an aliphatic polyester as a raw material. Is temporarily embedded in the hydraulic composition, and after the hydraulic composition is cured, substantially only the temporary embedded material is extracted from the cured body of the hydraulic composition.

The temporary buried object covered with the anti-adhesive material according to the present invention is a buried object which is buried on the assumption that it is pulled out after use or when it is no longer needed, or
It is not particularly limited as long as it is a buried object that is desirable to be pulled out, but in the following description, it is used for a structure that is composed of at least a temporary buried object and a cured product of a hydraulic composition. Buried objects will be taken as an example. That is, in the following description, an adhesion prevention method and a withdrawal method for a temporary buried object covering a temporary buried object used for the structure and an adhesion preventive material suitably used for these methods will be given as examples. .

Examples of the above-mentioned structures include ground foundation structures such as earth retaining walls and foundations in foundation works in the fields of construction and civil engineering. The hydraulic composition constituting the structure includes, for example, various concretes such as soil cement, various mortars, etc., but is not particularly limited, generally in the construction field and civil engineering field foundation construction, earth retaining Any hydraulic composition may be used as long as it is used when constructing a ground foundation structure such as a retaining wall or a foundation.
The hydraulic composition becomes a cured product by curing.
The types and combinations of cement, admixture, admixture, aggregate, reinforcing material, etc. contained in the hydraulic composition, that is, the composition of the hydraulic composition is not particularly limited.

Specific examples of the above-mentioned temporary buried object constituting the above-mentioned structure include, for example, H-section steel, I-section steel, iron columns, concrete piles, poles, tubular piles (hollow piles), and long plate-like shapes. Steel piles (sheet piles), corrugated sheets, and the like, which are piles of, are not particularly limited. Temporary buried objects are generally used when constructing ground foundation structures such as earth retaining walls and foundations in foundation works in the fields of construction and civil engineering, and it is necessary to pull them out from the cured product of the hydraulic composition after use. Any buried object (core material) will do. Moreover, the shape, length, material, etc. of the temporary buried object are not particularly limited.

The temporary embedding material does not have to be entirely embedded in the hydraulic composition, and at least a part thereof may be embedded in the hydraulic composition. Further, the temporary buried object in the present invention also includes the temporary buried object stored in, for example, a material storage area before constructing the structure.

In the present invention, the temporary embedding material is coated with an anti-adhesive material having a base material using an aliphatic polyester as a raw material to obtain the temporary embedding material and a cured product of the hydraulic composition. To prevent adhesion.

The aliphatic polyester is a polymer synthesized from a diol component and a dicarboxylic acid, and specific examples thereof include polylactic acid, polyethylene succinate, polyalkylene alkanoate, poly β-hydroxyalkanoate, and these. And the like.
Among these aliphatic polyesters, polylactic acid and polyethylene succinate are preferable because they are easily available and inexpensive, and have excellent biodegradability in a hydraulic composition.
Polylactic acid is particularly preferred.

The above-mentioned aliphatic polyester is, for example, spun singly, or composite spun with a material such as another polymer,
Alternatively, it is spun after being copolymerized or blended with another polymer. As a result, an aliphatic polyester fiber or an aliphatic polyester composite fiber (hereinafter, the aliphatic polyester fiber or the aliphatic polyester composite fiber is generically referred to as an aliphatic polyester fiber) is obtained. The aliphatic polyester fiber is used as a fibrous structure such as a lump of fibers, a woven fabric (fabric base fabric), a knitted fabric (knitted fabric base), a non-woven fabric, etc., which is formed into a sheet shape, a bag shape or a tubular shape. To be done.

In the base material, the aliphatic polyester is used as a main component, and the usage ratio thereof is preferably 80% by weight or more, and more preferably 90% by weight or more, although it depends on the usage form. More preferably, 100% by weight is particularly preferable.

In the case of covering the temporary embedding material by wrapping (wrapping) the sheet-like base material, for example, by sticking a sheet-like base material on the temporary embedding material, the sheet-like base material is
It is not necessary to have sufficient strength to support the temporary buried object when the temporary buried object is placed. Therefore, it is not always necessary to use a raw material other than the aliphatic polyester in combination for the purpose of imparting strength. Therefore, for example, by using a base material consisting of only aliphatic polyester as the base material,
The entire substrate is biodegradable and the substrate can be completely eliminated.

However, the base material may use other materials such as polymers other than the aliphatic polyester as a part of the raw material in order to impart strength to the base material. In this case, the base material does not completely disappear or has time to disappear, but the aliphatic polyester biodegrades and the fiber structure constituting the base material physically decomposes to form a fiber structure. Because the shape as the body collapses,
It can reduce waste and mitigate waste pollution.

Examples of other raw materials (materials) other than the aliphatic polyester used for the base material are, for example, polystyrene, polyethylene, polypropylene,
Examples thereof include vinyl chloride resin, urethane resin, phenol resin, and acrylic resin, but are not particularly limited. Specific examples of the fiber material that is composite-spun (blended) with the aliphatic polyester fiber include fibers such as glass fiber, glass fiber reinforced plastic, cotton fiber, hemp fiber, and polyester fiber; and the like. However, it is not particularly limited. Only one kind of raw material other than the aliphatic polyester may be used, or two or more kinds thereof may be used in combination (composite).

The thickness of the base material layer formed by the base material, that is, the thickness of the base material layer formed by the sheet-shaped base material may be appropriately set depending on the material, method of use, form of use, etc. In order to sufficiently prevent the adhesion between the water-soluble composition and the cured product of the hydraulic composition, the range of 0.01 mm to 10 mm is preferable, and the range of 0.
More preferably within the range of 05 mm to 8 mm, 0.2 mm
The range of up to 5 mm is particularly preferable. When the thickness of the base material layer is thicker than 10 mm, for example, when the thickness of the sheet-shaped base material is thicker than 10 mm, the flexibility of the covering material may be reduced. Further, since the covering material becomes bulky, there is a possibility that the handling property and the storage property thereof are deteriorated. On the other hand, when the thickness of the base material layer is less than 0.01 mm, for example, when the base material is biodegraded, a sufficient space is formed between the temporary buried object and the cured body of the hydraulic composition. It may not be possible to sufficiently improve the withdrawal property of the temporary buried object. For example, a plurality of the base materials may be used so that the thickness of the base material layer is within the above range.

The basis weight of the sheet-like base material may be set according to the material and thickness, but is 10 g / m ² to 10,
More preferably in the range of ^{000g / m 2, 20g / m} 2 ~
The range of 1,000 g / m ² is more preferable.

The tensile strength of the sheet-shaped substrate is not particularly limited, but is preferably 19.6 N / 5 cm or more, more preferably 196 N / 5 cm or more, and further preferably 588 N / 5 cm or more. Is particularly preferable. The tensile strength of the sheet-shaped substrate is 19.6 N /
If it is less than 5 cm, it tends to be torn or split when an external force is applied.

The above tensile strength has a width of 5 cm and a length of 20 c.
After cutting to a size of m, a test piece (sheet-like base material) that has been sufficiently wetted by immersion in ion-exchanged water for 30 minutes is used.
Using a low speed elongation tensile tester based on the tensile test method (tensile strength) of ISL 1096 (general textile test method),
It was measured under the conditions of a pulling speed of 20 mm / min and a gripping interval of 10 cm. It can be judged that the greater the measured value obtained by the tester, the greater the tensile strength of the sheet-shaped substrate.

As the base material, for example, a commercially available biodegradable sheet can be used. As the above-mentioned base material, for example, the time required for shape collapse is 6 based on the biodegradability (disintegration) test of JIS K 6953.
Polylactic acid nonwoven fabric "Terramac G0703 / WTO" (trade name; manufactured by Unitika Ltd., basis weight (basis weight) 70 g / m ² , thickness 0.37 mm, tensile strength 117.) within 30 days in a compost at 0 ° C. 6N / 5cm (length))
And polylactic acid non-woven fabric "Terramac ST200S00"
(Product name: Unitika Ltd., basis weight (basis weight) 200g
/ M ² , thickness 4.5 mm, tensile strength 117.6 N / 5c
m (length)) or the like can be used.

Although these biodegradable sheets are stable and hardly decomposed under normal room temperature environment, they are decomposed in the hydraulic composition and finally completely decomposed into carbon dioxide gas and water. To do.

The above-mentioned sheet-shaped base material, that is, the adhesion preventive material may be formed in a shape and a size capable of covering the temporary embedding material, but as will be described later in detail,
More preferably, it is formed in a bag shape or a cylindrical shape into which the temporary buried object can be inserted. By forming the sheet-shaped base material, that is, the adhesion-preventing material in the shape of a bag or a cylinder, it is possible to cover a large and heavy temporary embedding material more easily and quickly. Workability can be further improved.

The aliphatic polyester is gradually biodegraded in the hydraulic composition by contact with "water exhibiting alkalinity" (hereinafter referred to as alkaline water) present in the hydraulic composition, such as cement water. To do. For example, while various concretes such as soil cement harden in about half a day to one day, the base material (base cloth) made of polylactic acid is almost completely biodegraded after burying, for example, in several tens of days to several years. . Therefore, by coating the temporary embedding material with an adhesion preventive material including a base material using the aliphatic polyester as a raw material before embedding the temporary embedding material in a hydraulic composition, before biodegradation. Prevents direct contact between the temporary embedding material and the hydraulic composition, and after biodegradation forms a space (gap) between the temporary embedding material and the cured body of the hydraulic composition. Therefore, the work of pulling out the temporary buried product from the cured product of the hydraulic composition can be facilitated, and the workability of this work can be improved. In the present invention, the base material disappears or disintegrates due to the biodegradation of the aliphatic polyester, so that substantially only the temporary embedding material is extracted from the cured body of the hydraulic composition.

Further, the aliphatic polyester is excellent in biodegradability in the hydraulic composition as described above. Therefore, the above base material using the aliphatic polyester as a raw material,
Even if it is left in the cured body of the hydraulic composition part, it does not remain as coarse dust in the cured body of the hydraulic composition for a long period of time.

According to the present invention, even when the temporary embedding material is pulled out before the disintegration and disappearance of the base material due to the biodegradation of the aliphatic polyester, for example, the base material is formed into a bag shape or a tubular shape, The temporary embedding material is coated with the base material (adhesion preventive material) to keep the temporary embedding material and the hydraulic composition in a non-contact state, and after the hydraulic composition is cured, the base material is left as it is, and the By pulling out only the temporary buried object, it is possible to improve the pulling out property of the temporary buried object.

The above-mentioned substrate can be used as it is as an adhesion preventive material according to the present invention. By directly coating the above-mentioned temporary embedding material with the above-mentioned substrate, a cured product of the above-mentioned hydraulic composition before biodegradation is obtained. Although it is possible to pull out substantially only the temporary buried object from, between the temporary buried object and the hydraulic composition,
By interposing a hydrophobic lubricating layer containing a hydrophobic lubricant,
By using the adhesive force of the hydrophobic lubricating layer, the base material, that is, the adhesion preventive material, can be releasably adhered (attached) to the surface of the temporary embedding material, and at the same time when the temporary embedding material is pulled out. The frictional resistance force of can be reduced.

As a method for interposing a hydrophobic lubricating layer containing a hydrophobic lubricant between the temporary embedding material and the hydraulic composition, a hydrophobic lubricant is applied to the temporary embedding material to make it hydrophobic. Of applying a hydrophilic lubricant; a method of coating the temporary base material with the base material, that is, a base material having the hydrophobic lubricating layer on the inner surface when the temporary embedded material is coated with the adhesion preventive material Etc.

As the above-mentioned hydrophobic lubricant, specifically,
For example, wax, grease, tar, asphalt,
Examples include oils and fats and oil agents.

Wax means water-insoluble monovalent or divalent wax.
Esters of higher valent alcohols and fatty acids, and specifically, for example, plant waxes such as wood wax and cotton wax; animal waxes such as sperm whale oil, beeswax and wool wax; sticky oil,
Various waxes in liquid, semi-solid or solid form such as montan wax, ozokerite, petroleum wax, paraffin wax, microcrystalline wax, petrolatum; Among the above-exemplified waxes, the semisolid wax is lubricity, coating processability, and adhesion (adhesion) between the temporary embedding material and the adhesion preventive material.
From the viewpoint of, it is preferable because it is more excellent. Further, a semi-solid petroleum wax is particularly preferable.

The semi-solid wax is obtained by blending mineral oil, and the weight blending ratio of wax and mineral oil (wax:
(Mineral oil) in the range of 30:70 to 70:30, that is, the wax content is more than 30% by weight and less than 70% by weight,
It is particularly preferable from the viewpoints of lubricity, coating workability, and adhesion (adhesiveness) between the temporary embedding material and the adhesion preventive material. When the blending ratio of the wax is 30% by weight or less, the viscosity decreases at room temperature around 30 ° C., the liquid becomes close to a liquid (fluidization), the adhesion becomes weak, and the problem of liquid dripping may occur during coating processing. is there. Further, when it is 70% by weight or more, it becomes hard in a low temperature environment of 5 ° C. or less, which may hinder the coating of the adhesion preventive material on the temporary embedding material or may reduce the adhesion.

In addition to mineral oil, various additives such as polybutadiene and polyethylene may be added to the wax. For example, 1% by weight based on the total amount of the wax and the mineral oil. Addition within the range of up to 20% by weight can improve properties such as improved adhesion.

The grease is a semi-solid lubricant obtained by mixing a fatty acid metal salt with mineral oil. Specifically, for example, a mineral oil, a silicone oil (silicone grease), a diester oil base oil or the like is used as the base oil. In addition, a metal soap composed of a fatty acid salt such as a fatty acid calcium salt, a fatty acid sodium salt or a fatty acid lithium salt, a thickener such as a bentonite type, a silica gel type, a copper phthalocyanine type or an allylurea type is mixed. The grease is not particularly limited, but it does not fluidize at room temperature around 30 ° C, and
Even in a low temperature environment of 5 ° C. or less, a semi-solid material having a hardness (softness) within a range that does not hinder the coating of the adhesion preventive material on the temporary buried object is preferable.

Specific examples of tars include wood tar and coal tar. Among these tars, hardness (softness) that does not fluidize at room temperature around 30 ° C and does not hinder coating of the adhesion preventive material on the temporary embedding material even in a low temperature environment of 5 ° C or less. The range of is preferable.

Specific examples of fats and oils include fatty acids such as oleic acid, lauric acid and stearic acid; derivatives such as synthetic glycerin and polyglycerin; higher alcohols such as branched higher alcohols; soybean oil, Linseed oil, rapeseed oil, castor oil, cow oil, lanolin, margarine, heavy oil; and the like. Among these fats and oils, it does not fluidize at room temperature around 30 ° C and is 5 ° C.
Even in the following low temperature environment, a material having a hardness (softness) within a range that does not hinder the coating of the temporary adhesion material with the adhesion preventive material is preferable.

These hydrophobic lubricants may be used alone or in combination of two or more. Among the above-exemplified hydrophobic lubricants, semisolid waxes and greases are preferable because they are excellent in the lubricating effect and have a small content of volatile components. Semisolid lubricants that are semisolid at room temperature, such as wax and grease prepared by blending mineral oil into semisolid form, have both lubricating performance and adhesive force (adhesion), so solventless application is possible. Make it easy. A wax-based semi-solid lubricant is preferable because it can be easily melt-coated and the workability is further improved.

The semi-solid state means that the mixing consistency is 3 to 38.
The preferred hydrophobic lubricant has a miscibility of 3 to 385, more preferably 5 to 250, and further preferably 10 to 170.
Is a hydrophobic semi-solid lubricant within the range of. If the miscibility is less than 3, the lubricity will be reduced, and the adhesive strength to the steel material will be reduced, for example, and falling off will occur easily. Further, there is a problem that the melting or heating takes time and the melt coating becomes complicated. Further, if the mixing consistency exceeds 385, liquid sagging occurs, which contaminates the periphery and reduces the adhesive strength. The above-mentioned mixing consistency is determined by the test method of JIS K2560.

The hydrophobic lubricating layer may be, if necessary, within a range not impairing the lubricity of the hydrophobic lubricant.
For example, it may contain various additives such as surfactants, pulp fibers, rust preventives, antioxidants and hydrophilic lubricants.

As a method for forming the hydrophobic lubricating layer on the surface of the temporary buried object or the surface of the base material, for example, a heated melt obtained by heating and melting each component containing the above-mentioned hydrophobic lubricant, or the above-mentioned hydrophobic A method in which a dispersion liquid obtained by dispersing each component including a hydrophilic lubricant in a dispersion medium such as an organic solvent is sprayed on the surface of the temporary embedding material or the base material; Brush the semi-solid material with reduced
Alternatively, a method of applying using a roller; a method of impregnating the above-mentioned base material with the above heating melt or dispersion liquid, and the like can be employed. Among the above methods, the heating melt or the semi-solid whose viscosity is lowered by heating is used continuously with the base material surface while using rollers to adjust the amount of adhesion by adjusting the clearance between the upper and lower rollers. The coating method is particularly preferable because it is excellent in coating processability, productivity and product accuracy.

In the present invention, the method for preparing the dispersion liquid when the above dispersion liquid is used is not particularly limited. Specific examples of the organic solvent include methyl alcohol, ethyl alcohol, isopropyl alcohol, benzene, toluene, acetone, methyl ethyl ketone, ethyl acetate, and butyl acetate, but are not particularly limited. .

The film thickness of the hydrophobic lubricating layer is 1 μm to 1
It is preferably in the range of 10,000 μm and 10 μm to 5,0.
The range of 00 μm is more preferable, and 100 μm to 2,0
The range of 00 μm is more preferable, and 300 μm to 1,
The range of 000 μm is particularly preferable. When the film thickness of the hydrophobic lubricating layer is less than 1 μm, the effect of improving the separability and lubricity of the hardened product of the hydraulic composition and the temporary embedding is poor due to the provision of the hydrophobic lubricating layer. The adhesion of the preventive material to the temporary embedding material is also reduced, which is not preferable. On the other hand, when the thickness of the hydrophobic lubricating layer exceeds 10,000 μm, the weight and bulk of the obtained anti-adhesion material increase, and the handleability and the processability during production are deteriorated, which is not preferable.

The amount of the hydrophobic lubricant adhered to the temporary buried object or the base material, that is, the amount of the hydrophobic lubricant adhered per unit area is determined by the kind of the hydrophobic lubricant or the temporary buried object to be adhered. Alternatively, it can be set according to the combination with the base material, the condition of the surface of the temporary embedding object to be attached or the surface of the base material (unevenness, etc.), the work environment, etc., but both coating processability and adhesion are satisfied. 1 g / m ² to 1
It is preferably in the range of 30,000 g / m ² , and 1
More preferably in the range of ^{0g / m 2 ~5,000g / m 2} , more preferably in the range of ^{100g / m 2 ~2,000g / m 2} , 300g / m 2 ~1,
The range of 000 g / m ² is particularly preferable.

The ratio of the lubricant to 100 parts by weight of the base material is preferably in the range of 1 part by weight to 10,000 parts by weight in order to satisfy both coating processability and adhesiveness. It is more preferably in the range of 10 parts by weight to 2,000 parts by weight, and particularly preferably in the range of 20 parts by weight to 1,000 parts by weight.

The anti-adhesion material may be added to the hydrophobic lubricating layer or instead of the hydrophobic lubricating layer.
It may have a configuration including a resin layer containing at least a water-absorbent resin.

The resin layer may be provided on only one surface of the base material, or may be provided on both surfaces thereof.
Prevention of adhesion between hydraulic composition and temporary embedding (drawing / separation, safety, adhesion of temporary embedding), simplification of work for covering and embedding temporary embedding, production of anti-adhesion material As a result of considering processability, economy, etc., the hydrophobic lubricating layer is a surface on which the water-absorbent resin is not attached in the base material, that is,
It is preferably provided on the surface opposite to the surface on which the resin layer is formed. The resin layer is preferably provided on at least a surface which is the outside of the base material when the temporary embedding material is covered with the adhesion preventive material, such as a contact surface with a hydraulic resin.

Since the above-mentioned adhesion preventive material is provided with the above-mentioned resin layer, between the cured body of the hydraulic composition and the temporary embedding material,
A layer of a water-absorbent resin that swells by absorbing water is formed. The layer of the swollen water-absorbent resin suppresses adhesion between the cured body of the hydraulic composition and the temporary embedding, and exhibits a lubricating effect when the temporary embedment is pulled out from the cured body of the hydraulic composition. As a result, it is possible to reduce the frictional resistance force when pulling out the temporary buried object.

Further, in the above-mentioned anti-adhesion material, since the above-mentioned base material uses aliphatic polyester as a raw material, the shape of the anti-adhesion material until the temporary embedding material is covered, for example, the sheet shape is maintained. While it is possible to stably hold the resin layer, after temporarily embedding the temporary embedding material in the hydraulic composition, the base material is biodegraded and a cured body of the hydraulic composition and By creating a space (gap) between the temporary embedding and the embedding, the labor required for pulling out the temporary embedding can be further reduced.

For this reason, the resin layer functions as a water-absorbing lubricating layer in a state of being held by the base material in the case where the temporary buried object is pulled out before the disintegration and disappearance of the aliphatic polyester before biodegradation. To do.

Further, in the anti-adhesion material, the resin layer is provided on a surface which is an outer side of the base material when the temporary embedding material is covered with the anti-adhesion material, that is,
By covering the temporary embedding material with the anti-adhesion material so that the resin layer is on the outside of the base material, the temporary embedding material is made to have a hydraulic composition by a synergistic effect of the base material and the resin layer. The work of pulling out from the cured product can be facilitated, and the workability of this work can be significantly improved.

Since the base material is provided with the resin layer, even if the temporary embedding material is pulled out after the base material is biodegraded, the temporary embedding material is made into a hydraulic composition by its synergistic effect. Although it is not clear why the workability of pulling out from a cured product can be significantly improved unexpectedly from its structure, an aliphatic polyester has a high biodegradation rate in an alkaline environment and is a hydraulic composition. Whereas the biodegradation progresses even before curing, the resin layer is provided on the surface that is the outside of the base material when the temporary embedding material is covered with the adhesion preventing material. The alkaline water contained in the hydraulic resin composition is absorbed by the water absorbent resin before contacting with the base material, and the amount of alkaline water contacting with the base material can be adjusted. Delayed biodegradation rate of wood It is possible to form a sufficient space between the cured body of the hydraulic composition and the temporary embedding material, and sufficiently prevent the adhesion between the cured body of the hydraulic composition and the temporary embedding material. What can be done is considered as one of the reasons. That is, in the present invention, the resin layer functions not only as a water-absorbing lubricating layer but also as a layer for controlling the biodegradation rate of the base material.

The anti-adhesion material does not have a hydrophobic lubricating layer, and the resin layer is formed only on the outer surface of the base material when the temporary embedding material is covered with the anti-adhesion material. By being formed, it is possible to keep the surface of the pulled out temporary embedding in a clean state.

The water-absorbent resin used in the present invention may be any resin as long as it swells by absorbing water and has a deionized water absorption capacity against its own weight of 3 times or more, and is not particularly limited. However, the water absorption ratio is 10
More than double the resin is more preferable. As the water-absorbent resin,
Specifically, for example, poly (meth) acrylic acid crosslinked product,
Crosslinked poly (meth) acrylic acid salt, crosslinked poly (meth) acrylic acid ester having sulfonic acid group, crosslinked poly (meth) acrylic acid ester having polyoxyalkylene group, crosslinked poly (meth) acrylamide, ( Meta)
Copolymerized cross-linked product of acrylate and (meth) acrylamide, hydroxyalkyl (meth) acrylate and (meth)
Copolymerized cross-linked product with acrylic acid salt, polydioxolane cross-linked product, cross-linked polyethylene oxide, cross-linked polyvinyl pyrrolidone, sulfonated polystyrene cross-linked product, cross-linked polyvinyl pyridine, saponified product of starch-poly (meth) acrylonitrile graft copolymer, starch- Poly (meth) acrylic acid (salt) graft cross-linked copolymer, reaction product of polyvinyl alcohol and maleic anhydride (salt), cross-linked polyvinyl alcohol sulfonate, polyvinyl alcohol-acrylic acid graft copolymer, polyisobutylene malein Examples thereof include acid (salt) cross-linked polymers. These water-absorbent resins may be used alone if necessary,
Moreover, you may use together 2 or more types. Further, another resin may be used in combination with the water absorbent resin to the extent that various properties of the water absorbent resin (such as water absorption capacity) are not impaired.

Among the water-absorbent resins exemplified above, a water-absorbent resin having a nonionic group and / or a sulfonic acid (salt) group is more preferable, and a water-absorbent resin having an amide group or a hydroxyalkyl group is further preferable. Examples of the water-absorbent resin include a copolymer crosslinked product of (meth) acrylic acid salt and (meth) acrylamide, a copolymerized crosslinked product of hydroxyalkyl (meth) acrylate and (meth) acrylic acid salt, and the like. To be Further, among the water-absorbent resins exemplified above, a water-swellable resin having a polyoxyalkylene group is particularly preferable. Examples of the water absorbent resin include a crosslinked copolymer of a (meth) acrylic acid ester having a methoxypolyoxyalkylene group and a (meth) acrylic acid salt. The water-swellable resin having a polyoxyalkylene group is particularly excellent in swelling property with respect to alkaline water such as cement water, and can facilitate the work of pulling out the temporary buried object and improve the workability of this work.

Further, as the water absorbent resin according to the present invention, a resin obtained by polymerizing a monomer component containing a water-soluble ethylenically unsaturated monomer and, if necessary, a crosslinking agent is used. be able to. A water-absorbent resin obtained by (co) polymerizing an ethylenically unsaturated monomer is excellent in swelling property in water and is generally inexpensive. Therefore, by using the water absorbent resin, the work of pulling out the temporary buried object can be performed very easily and more economically. The cross-linking agent is not particularly limited. In addition, in the linear polymer,
It is also preferable to form a water-absorbent resin by adding a crosslinking agent to perform crosslinking, or by irradiating with an electron beam to perform crosslinking.

As the above-mentioned ethylenically unsaturated monomer,
Specifically, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, citraconic acid, vinylsulfonic acid, (meth) allylsulfonic acid,
2- (meth) acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid,
2- (meth) acryloylpropane sulfonic acid, and alkali metal salts and ammonium salts of these monomers;
N, N-dimethylaminoethyl (meth) acrylate,
And its quaternary compounds; (meth) acrylamide, N,
(Meth) acrylamides such as N-dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylamide, diacetone (meth) acrylamide, N-isopropyl (meth) acrylamide, (meth) acryloylmorpholine, and these monomers Derivatives of hydroxyalkyl (meth) acrylates such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate; polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, methoxypolyethylene glycol mono ( (Meth) acrylate, polyalkylene glycol mono (meth) acrylate such as methoxy polypropylene glycol mono (meth) acrylate; N-vinyl-
N-vinyl monomers such as 2-pyrrolidone and N-vinylsuccinimide; N-vinylformamide, N-vinyl-N
-Methylformamide, N-vinylacetamide, N-
Examples thereof include N-vinylamide monomers such as vinyl-N-methylacetamide; vinylmethyl ether; and the like, but are not particularly limited. These ethylenically unsaturated monomers may be used alone or in combination of two or more.

Among the above-exemplified ethylenically unsaturated monomers, ethylenically unsaturated monomers having a nonionic group and / or a sulfonic acid (salt) group are more preferable. Specific examples of the monomer include 2- (meth) acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2- (meth) acryloylpropanesulfonic acid, and (meth ) Acrylamide, hydroxyalkyl (meth) acrylate, methoxypolyethylene glycol mono (meth) acrylate and the like. Further, among the above-exemplified ethylenically unsaturated monomers, an ethylenically unsaturated monomer having a polyoxyalkylene group is particularly preferable. In particular, a water-absorbent resin obtained by polymerizing a monomer component containing methoxypolyethylene glycol mono (meth) acrylate is particularly excellent in swelling property in alkaline water. Therefore, by using the water absorbent resin, the work of pulling out the temporary buried object can be facilitated and the workability of this work can be further improved.

When two or more kinds of ethylenically unsaturated monomers are used together as a monomer component, the ethylenically unsaturated monomer having a nonionic group and / or a sulfonic acid (salt) group in the monomer component is used. The proportion of the monomer is preferably 1% by weight or more, more preferably 10% by weight or more. When the above ratio is less than 1% by weight, the effect of improving the workability of the work of pulling out the temporary buried object may not be sufficiently exerted even if the water absorbent resin obtained by polymerizing the above monomer components is used. is there.

When two or more ethylenically unsaturated monomers are used in combination as the monomer component, a more preferable combination is, for example, a combination of an alkali metal (meth) acrylic acid salt such as sodium acrylate and acrylamide. , A combination of (meth) acrylic acid alkali metal salt and methoxy polyethylene glycol mono (meth) acrylate.

Although the water-absorbent resin is obtained by polymerizing the above-mentioned monomer component, the method for polymerizing the monomer component, that is, the method for producing the water-absorbent resin is not particularly limited.

The average molecular weight, shape, average particle size, etc. of the water-absorbent resin are determined by the composition of the hydraulic composition and the p of alkaline water.
It may be appropriately set according to H, working environment, combination with a base material and the like, and is not particularly limited, but the average particle diameter is 2,000 μm or less, more preferably 500 μm or less, and further preferably 200 μm or less, It is particularly desirable to use a water-absorbent resin having a thickness of 100 μm or less.
The most preferable average particle size is 70 μm or less, and by using the water-absorbent resin having the average particle size, the dispersibility or mixability of the water-absorbent resin in mixing with the hydrophobic lubricant becomes good, and the adhesion of the mixture is prevented. Property and handleability are further improved. Further, a layer of the above mixture can be easily formed, for example, when it is adhered and formed on the surface of a sheet-shaped substrate. Further, it is easy to increase the amount of the water-absorbent resin contained in the layer of the mixture per unit area in a uniform state, and the anti-adhesion performance can be further improved.

The above water-absorbent resin can be produced, for example, by the following method. The water-absorbent resin and the method for producing the water-absorbent resin described below are examples of the water-absorbent resin used in the present invention. It is not limited to only the water absorbent resin obtained by.

First, a kneader equipped with a thermometer and a blade (stirring blade) and having an internal surface lined with ethylene trifluoride and having a capacity of 1.5 L was used as a reactor, and the reactor was equipped with a kneader. Methoxy polyethylene glycol methacrylate (molecular weight 512) 55.18 g, methacrylic acid (molecular weight 86.09) 3.76 g, sodium methacrylate (molecular weight 108) 215.69 g, polyethylene glycol diacrylate 1.4 as a cross-linking agent
g and 352.37 g of ion-exchanged water as a solvent were charged. The ratio of the cross-linking agent in the monomer component is 0.15
Mol%.

By flowing hot water of 50 ° C. into the jacket, the above aqueous solution was stirred under a nitrogen gas stream while stirring.
Heated to ° C. Next, the polymerization initiator 2,2′-azobis- (2-amidinopropane) dihydrochloride (molecular weight 2
71.27, chemical product V-50 manufactured by Wako Pure Chemical Industries, Ltd.)
10 g of a 11.6 wt% aqueous solution was added and stirred for 10 seconds, and then the stirring was stopped and the mixture was allowed to stand. The ratio of the above-mentioned polymerization initiator to the monomer component is 0.2 mol%.

The polymerization reaction was started immediately after the addition of the polymerization initiator, and after 90 minutes, the internal temperature reached 100 ° C. (peak temperature). Then, the contents were aged for 30 minutes while flowing warm water of 80 ° C. through the jacket. Thereby, a hydrogel was obtained. After completion of the reaction, the blade was rotated to disintegrate the hydrous gel to a fine state, and then the reactor was inverted to take out the hydrous gel.

The obtained hydrogel was dried at 140 ° C. for 3 hours using a hot air circulation dryer. After drying, the dried product was crushed using a desktop simple crusher (manufactured by Kyoritsu Riko Co., Ltd.). As a result, a water absorbent resin having an average particle diameter of 150 μm was obtained.

As the water absorbent resin, a commercially available water absorbent resin can also be used. Examples of such a water-absorbent resin include a commercially available polyacrylic acid sodium salt crosslinked product “Aqualic ML-20” (trade name; manufactured by Nippon Shokubai Co., Ltd., average particle diameter 20 μm) and a commercially available sodium polyacrylate. Salt cross-linked product "Aqualic ML-7
0 "(trade name; manufactured by Nippon Shokubai Co., Ltd., average particle size 50 μm
m) and the like can be used.

It is more preferable that the resin layer further contains an alkaline water-soluble resin. The alkaline water-soluble resin functions as a bonding agent for adhering the water-absorbent resin to the base material, is solubilized when contacted with alkaline water such as cement water, and does not impair the water-absorption swelling property of the water-absorbent resin.
Further, the alkaline water-soluble resin has excellent coating properties and firmly adheres (attaches) to the base material, and the water absorption before or during construction due to unexpected water wetness / rainfall (including acid rain) It is possible to prevent the functional resin from falling off. Therefore, the labor (tensile force) in the work of pulling out the temporary buried object from the cured product of the hydraulic composition can be further reduced.

The alkaline water-soluble resin is a resin which is soluble in alkaline water made alkaline by dissolving sodium hydroxide in ion-exchanged water in a proportion of 0.4% by weight, and has an acid value of 15 mgKOH / g or more. In addition, any resin that does not dissolve in neutral and acidic water may be used.

As the above alkaline water-soluble resin, for example, a resin having a substituent such as a carboxylic acid group, a sulfonic acid group or a phosphonic acid group is more preferable, and an α, β-unsaturated carboxylic acid type monomer and a vinyl type resin are preferable. The resin obtained by copolymerizing with a monomer is excellent in solubility or swelling property in alkaline water, and economical efficiency, and is excellent in various physical properties of the resin layer formed on the surface of the base material, and α, The carboxylic acid group of the β-unsaturated carboxylic acid-based monomer is particularly preferable because it strongly interacts with various materials and the adhesiveness of the resin layer to the above-mentioned base material becomes better.

Specific examples of the α, β-unsaturated carboxylic acid type monomer include α, β-unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid; itaconic acid, maleic acid and fumaric acid. Α, β-unsaturated dicarboxylic acids such as acids;
Α, β-unsaturated dicarboxylic acid anhydrides such as maleic anhydride and itaconic anhydride; α, β-unsaturated dicarboxylic acid monoesters such as maleic acid monoester, fumaric acid monoester, itaconic acid monoester; and the like. To be These α, β-unsaturated carboxylic acid type monomers may be used alone or in combination of two or more. Among the α, β-unsaturated carboxylic acid-based monomers exemplified above, acrylic acid and methacrylic acid are more preferable because they are more excellent in flexibility and toughness of the resin layer formed on the surface of the base material.

Specific examples of the vinyl-based monomer include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, stearyl acrylate, methyl methacrylate, ethyl methacrylate and methacrylic acid. Ester of monohydric alcohol having 1 to 18 carbon atoms and (meth) acrylic acid such as propyl acid, butyl methacrylate, stearyl methacrylate; nitrile group-containing vinyl monomers such as acrylonitrile and methacrylonitrile; acrylamide; Amide group-containing vinyl monomers such as methacrylamide; hydroxyethyl acrylate,
Hydroxypropyl group-containing vinyl monomer such as hydroxypropyl methacrylate; Epoxy group-containing vinyl monomer such as glycidyl methacrylate; Metal salt of α, β-unsaturated carboxylic acid such as zinc acrylate and zinc methacrylate; Styrene, α
-Aromatic vinyl monomers such as methylstyrene; Aliphatic vinyl monomers such as vinyl acetate; Halogen group-containing vinyl monomers such as vinyl chloride, vinyl bromide, vinyl iodide, and vinylidene chloride; Allyl Ethers; maleic anhydride,
Maleic acid derivatives such as maleic acid monoalkyl ester and maleic acid dialkyl ester; fumaric acid derivatives such as fumaric acid monoalkyl ester and fumaric acid dialkyl ester; maleimide, N-methylmaleimide, N-stearylmaleimide, N-phenylmaleimide, N -Maleimide derivatives such as cyclohexylmaleimide; itaconic acid monoalkyl esters, itaconic acid dialkyl esters, itaconic amides, itaconic imides, itaconic acid derivatives such as itaconic acid esters; alkenes such as ethylene and propylene; dienes such as butadiene and isoprene And the like. These vinyl monomers may be used alone or in combination of two or more.

Among the above-exemplified vinyl-based monomers, alkyl acrylate and methacrylic acid alkyl ester are excellent in flexibility, adhesion, weather resistance and toughness of the resin layer formed on the surface of the base material. Therefore, it is more preferable. Further, when the proportion of the (meth) acrylic acid alkyl ester in the vinyl-based monomer is 30% by weight or more, the flexibility, adhesion, weather resistance and toughness of the resin layer are further improved. preferable. Furthermore, the (meth) acrylic acid alkyl ester has a carbon number of 1
It is most preferable to use an ester of -18 monohydric alcohol and (meth) acrylic acid because the flexibility, adhesion, weather resistance and toughness of the resin layer are particularly improved. Furthermore, when the (meth) acrylic acid alkyl ester is an ester of a monohydric alcohol having 1 to 4 carbon atoms and (meth) acrylic acid, it is more susceptible to hydrolysis by alkaline water, and therefore, It is particularly preferable because the solubility in alkaline water is further improved.

The ratio of the α, β-unsaturated carboxylic acid monomer to the total amount of the α, β-unsaturated carboxylic acid monomer and the vinyl monomer is 9% by weight or more. More preferably, and still more preferably within the range of 9% by weight to 40% by weight. By setting the proportion of the α, β-unsaturated carboxylic acid-based monomer to 9% by weight or more, it is possible to obtain an alkaline water-soluble resin that is more excellent in solubility in alkaline water. When the proportion of the α, β-unsaturated carboxylic acid-based monomer is set within the range of 9% by weight to 40% by weight, the solubility in alkaline water is particularly excellent, and neutral and acidic waters are obtained. On the other hand, an alkaline water-soluble resin exhibiting water resistance can be obtained.

The above alkaline water-soluble resin has the above α, β
It can be obtained by copolymerizing an unsaturated carboxylic acid type monomer and a vinyl type monomer. The copolymerization method, that is, the method for producing the alkali water-soluble resin is not particularly limited, but the solution polymerization method forms a resin solution (water-absorbent resin dispersion liquid) described below for forming the resin layer. It is more preferable because it is easy to do. The average molecular weight of the alkaline water-soluble resin may be set according to the composition of the hydraulic composition, the pH of the alkaline water, the working environment, etc., and is not particularly limited, but the weight average molecular weight is 40,000. When it is in the range of from 200,000 to 200,000, a tougher resin layer is obtained, and moreover, it has an appropriate dissolution rate in alkaline water, which is more preferable. Since the alkaline water-soluble resin according to the present invention has excellent solubility in alkaline water, there is no possibility of inhibiting the volume expansion when the water absorbent resin absorbs water and swells. Therefore, the water absorbent resin has its water absorption characteristics (performance).
Can be fully exerted.

The acid value of the alkaline water-soluble resin according to the present invention may be 15 mgKOH / g or more, but is 30 m.
More preferably gKOH / g or more, 50 mg
More preferably at least KOH / g, 70 mg
Particularly preferred is KOH / g or more, 70 mgK
Most preferably, it is within the range of OH / g to 500 mg KOH / g. Acid value of alkaline water soluble resin is 15mg
If it is less than KOH / g, the solubility in alkaline water becomes poor, and the effect of improving the workability of the work of pulling out the temporary buried object may become poor. Also,
When the acid value of the alkaline water-soluble resin exceeds 500 mgKOH / g, the water resistance of the alkaline water-soluble resin decreases, so that the above-mentioned anti-adhesion agent is water having a pH in a neutral region or an acidic region such as rain. When contacted with, the alkaline water-soluble resin is dissolved, and the resin layer may swell and be damaged. Therefore, the effect of improving the workability of the work of pulling out the temporary buried object may be poor.

The acid value of the alkaline water-soluble resin is determined according to JIS K when the sample is the alkaline water-soluble resin alone.
6901 “Liquid unsaturated polyester resin test method” can be measured based on the test method described in 4.3. However, when the alkaline water-soluble resin does not dissolve in the solvent specified in the test method, a solvent that dissolves is appropriately used and the measurement is performed according to the above test method. When the sample is a mixture of an alkaline water-soluble resin and a water-absorbent resin or a coating film thereof, the sample is dissolved or dispersed in an organic solvent, and then the filtrate and the water-absorbent resin in which the alkaline water-soluble resin is dissolved by filtration are used. The resin and the filtrate are separated, and the filtrate is measured based on the test method described in JIS K6901 “Test method for liquid unsaturated polyester resin”, Clause 4.3. The nonvolatile content obtained by drying the filtrate is the total amount of the alkaline water-soluble resin.

The alkaline water-soluble resin according to the present invention is
Differential scanning calorimetry (DSC)
The glass transition temperature measured by
It is preferable to have the glass transition temperature in the range of 80 ° C to 120 ° C, and the glass transition temperature of the low temperature side in the range of -30 ° C to 20 ° C, while the glass of the high temperature side in the range of 40 ° C to 100 ° C. More preferably, it has a transition temperature.

The above glass transition temperature measuring method, that is, the differential scanning calorimetry of the alkaline water-soluble resin can be carried out by using DSC220C manufactured by Seiko Denshi Kogyo Co., Ltd. The measurement conditions are as follows. First, in a nitrogen gas atmosphere, 10 mg of sample was heated to 150 ° C.,
After holding at the temperature for 5 minutes, it is rapidly cooled to −100 ° C. and held at the temperature for 5 minutes. Subsequently, the sample is heated to 150 ° C. at a heating rate of 10 ° C./minute. And DSC
The temperature at which the inflection point on the curve is read is read according to a conventional method, and the temperature is taken as the glass transition temperature of the alkaline water-soluble resin.

The glass transition temperature on the low temperature side is −30 ° C. to 20.
By existing in the range of ° C., the toughness of the resin layer at a low temperature becomes higher, and the resin layer peels off from the substrate due to the decrease in the toughness even when the work site is at a low temperature, for example, in winter. Less likely to Further, since the glass transition temperature on the high temperature side is in the range of 40 ° C. to 100 ° C., the resin layer becomes sticky or softens even when the work site is at a high temperature, for example, in summer. For example, there is no possibility of being easily damaged by contact with a rope or the like. Therefore, the alkaline water-soluble resin is
When the glass transition temperature on the low temperature side is in the range of 20 ° C, while the glass transition temperature on the high temperature side is in the range of 40 ° C to 100 ° C, it is stable and not easily affected by the temperature change at the work site. It is possible to form a simple resin layer, that is, a resin layer that is not easily peeled or damaged and is not sticky.

When the alkaline water-soluble resin and the water-absorbent resin are used together (mixed), that is, the ratio of the alkaline water-soluble resin and the water-absorbent resin in the resin layer is the composition and combination of both, and the working environment. It may be set according to the above, and is not particularly limited, but from the viewpoint of satisfying both the water absorption swelling property and the adhesive property (non-dropping property) of the water absorbent resin, the weight ratio is 1/99 to 99. The range of / 1 is more preferable, the range of 10/90 to 90/10 is more preferable, and the range of 25/75 to 75/25 is particularly preferable.

The ratio of the resin layer to the base material, that is, the adhesion amount of the alkaline water-soluble resin and the water-absorbent resin per unit area of the sheet-shaped base material, depends on the composition and combination of the two and the working environment. Just set
Although not particularly limited, from the viewpoint of satisfying both the above-mentioned anti-adhesion property and the productivity of coating on a sheet substrate, 1
more preferably in the range of ^{g / m 2 ~10,000g / m 2} , more preferably in the range of ^{10g / m 2 ~1,000g / m 2} , in the range of 20g / m ² ~500g / m ² is particularly preferable. The ratio of the alkaline water-soluble resin and the water-absorbent resin to 100 parts by weight of the sheet-shaped substrate is from 1 part by weight to 10,000 from the viewpoint of satisfying both the above-mentioned anti-adhesion property and the coating productivity on the sheet substrate. The range of parts by weight is more preferable, the range of 10 parts by weight to 1,000 parts by weight is more preferable, and the range of 20 parts by weight to 500 parts by weight is particularly preferable.

The sheet-shaped substrate is coated with a resin solution (water-absorbent resin dispersion liquid) as a coating material obtained by mixing at least an alkaline water-soluble resin and a water-absorbent resin to bond the above-mentioned anti-adhesive material. The prevention ability can be improved, the work of pulling out the temporary buried object from the cured body of the hydraulic composition can be facilitated, and the workability of this work can be further improved.

The coating material obtained by mixing the alkaline water-soluble resin and the water-absorbing resin can also be used as a coating-type anti-adhesive agent. For example, instead of the hydrophobic lubricant, It can be used by applying it to the surface of a temporary buried object.

The method of forming the resin layer on the surface of the base material or the surface of the temporary embedding material is not particularly limited, but specifically, for example, an alkaline water-soluble resin and a water-absorbent resin are used in combination. In some cases, a method of spraying a resin solution (water-absorbent resin dispersion liquid) obtained by dissolving (or dispersing) both of them in a dispersion medium such as an organic solvent or water on the surface of the base material or the surface of the temporary embedding material. A method of applying the resin solution with a brush or a roller, a method of impregnating a sheet-shaped substrate with the resin solution, and the like. In addition, after spraying or applying a resin solution or dispersion containing an alkaline water-soluble resin on the surface of the sheet-shaped substrate or the surface of the temporary embedding material, a water-absorbent resin is evenly spread on the surface, and further, an alkali A method of spraying or coating the above resin solution or dispersion containing a water-soluble resin; Among the methods exemplified above, a resin solution (water-absorbent resin dispersion liquid) obtained by dissolving (or dispersing) an alkaline water-soluble resin and a water-absorbent resin in a dispersion medium such as an organic solvent or water is used as a sheet-shaped substrate surface or On the surface of the temporary buried object,
The method of spraying or applying is more preferable because it is easy in terms of work and production. Further, when the resin solution (water-absorbent resin dispersion liquid) is applied to the surface of the sheet-shaped substrate, a method of continuously applying the coating is particularly preferable while adjusting the clearance between the upper and lower rollers to control the amount of adhesion. preferable. The above resin solution or dispersion applied on the surface of the base material or the surface of the temporary embedding material may be dried if necessary. As a result, a resin layer is formed on the surface of the base material (outer surface and / or inner surface) or the surface of the temporary buried object.

The method for preparing the resin solution containing the alkali water-soluble resin and the water absorbent resin is not particularly limited. Specific examples of the organic solvent include methyl alcohol, ethyl alcohol, isopropyl alcohol, benzene, toluene, acetone, methyl ethyl ketone, ethyl acetate, butyl acetate; ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether. Examples thereof include polyhydric alcohols and derivatives thereof such as acetate and polypropylene glycol monomethyl ether acetate; however, they are not particularly limited. The film thickness of the resin layer is sufficient if it is about 10 μm, but it may be set according to the particle diameter of the water absorbent resin and is not particularly limited.

The alkaline water-soluble resin in the resin layer does not easily dissolve even when contacted with water having a neutral or acidic pH such as rain. That is, the alkaline water-soluble resin has excellent water resistance and is not damaged even when contacted with water having a pH in the neutral range or the acidic range. Therefore, even if rainfall occurs during the work, the performance is not impaired. In addition, when constructing the structure, the temporary embedding material can be coated with the anti-adhesion material at the work site. For example, the temporary embedding material is previously coated with the anti-adhesion material, and the Temporary buried objects can also be loaded at the work site. That is, since the work can be simplified and rationalized as appropriate according to the situation of the work site, the structure can be quickly constructed.

Further, if necessary, a water resistant coating composed of a water resistance-imparting agent may be formed on the surface of the resin layer (so-called top coat). As the water resistance-imparting agent,
Examples thereof include the above-mentioned alkaline water-soluble resin; conventionally known water repellents such as wax and silicone-based water repellents; and the like, but it may be selected in consideration of the combination with the resin layer, and is particularly limited. Not a thing. Further, the method for applying (adhering) the water resistance-imparting agent to the surface of the resin layer to form the water resistance coating is not particularly limited, but specifically, for example, the water resistance imparting agent is exemplified above. A method of spraying a dispersion liquid obtained by dispersing in a dispersion medium such as an organic solvent, that is, a dispersion liquid of a water resistance imparting agent on the surface of the resin layer;
Etc. may be adopted. The dispersion liquid applied to the surface of the resin layer may be dried if necessary. As a result, a water resistant coating made of a water resistance imparting agent is formed on the surface of the resin layer. The adhesion amount of the water resistant coating is sufficient if it is about 50 g / m ² , but is not particularly limited.

By forming the water resistant coating on the surface of the resin layer, for example, when the anti-adhesive material or the temporary embedding material is stored, the anti-adhesion material or the temporary embedding material is loaded in the material storage space or the like. Even so, the water-absorbent resin does not swell by absorbing water from rain, night dew, or the ground. Therefore, it is not necessary to cover the anti-adhesion material or the temporary buried object with, for example, a waterproof sheet or store it in an indoor material storage space, and it can be stored easily and inexpensively.

As described above, according to the present invention, by coating the above-mentioned temporary embedding material with the above-mentioned anti-adhesion material, a cured product of the hydraulic composition and an H-shaped material which is temporarily embedded in the hydraulic composition. Prevents adhesion with temporary buried objects such as steel, facilitates the work of pulling out the temporary buried object from the cured body of the hydraulic composition, and improves the workability of this work, while reducing dust. Therefore, it is possible to reduce the pollution of garbage.

In the present invention, “coating” does not necessarily cover the temporary embedding with a covering so that the temporary embedding cannot be seen. For example, the temporary embedding can be easily pulled out from the cured product of the hydraulic composition. It is shown that the temporary embedding material is covered with an anti-adhesion material (covering material) to such an extent that the above can be achieved, that is, the adhesion between the two can be suppressed.

As a method of coating the above-mentioned temporary buried object with the above-mentioned adhesion preventing material, that is, a method of forming a covering structure in which the above-mentioned temporary buried object is covered with the above-mentioned adhesion preventing material, for example,
As shown in FIG. 2 (a), the temporary buried object 2 is lifted up using a crane 6, and a string 3 passed through a pulley 5 provided at the tip of the crane 6 is formed into, for example, a bag shape or a tubular shape. Attached to the adhered anti-adhesion material 1 (covering material), and then
After the adhesive preventive material 1 is inserted into the temporary buried object 2 such that the worker 4 pulls the string 3 so that the worker can wear the string 3 from below, as shown in FIG. A method of pulling up the anti-adhesion material 1 by further pulling it, and mounting and fixing the anti-adhesion material 1; inserting the tubular anti-adhesion material (covering material) into the temporary buried object so as to cover it from above, and the upper end portion. After fixing the, the temporary buried object is lifted by using a crane, and then, for example, an operator pulls the string attached to the lower end portion of the adhesion preventing material to pull down the adhesion preventing material and attach it; a bag -Shaped or tubular anti-adhesion material (covering material) is placed on the ground, etc., then a temporary embedded object is inserted into the anti-adhesion material, and then the anti-adhesion material is pulled up and mounted and fixed. Method: After placing the temporary buried object on the ground, A method of inserting a bag-shaped or tubular anti-adhesive material (covering material) into the temporary embedding product, then lifting the temporary embedding product and lifting and mounting and fixing the anti-adhesion material; FIG. As shown in FIG. 3, for example, after placing the temporary buried object 2 on the sheet-shaped anti-adhesion material 10 provided with a hydrophobic lubricating layer on the surface using a crane 6 or the like, FIG. ), The temporary embedding material 2 is wrapped with the adhesion preventive material 10 by using the adhesiveness (adhesiveness) of the hydrophobic lubricating layer, and the adhesion preventing material 10 is adhered to the surface of the temporary embedding material 2. (Affixing) method: A method of sandwiching and fixing the temporary embedding material between the adhesion preventing materials folded in a bellows shape; applying a commercially available adhesion or the like to at least a part of the temporary embedding material or the adhesion preventing material, and Fix the anti-adhesion material to the temporary buried object, or the temporary buried object A method of fixing a part of the anti-adhesion material on the upper part and hanging the remaining part of the anti-adhesion material along the temporary embedding material; after enclosing the temporary embedding material with a sheet-shaped anti-adhesion material, the anti-adhesion material From above, a method of fixing with a string, belt, gum tape or the like, preferably made of a biodegradable substrate; when the temporary buried object has flanges at the corners such as H-section steel, the above-mentioned adhesion Form a notch, etc. at the end of the prevention material,
For example, a method of fixing the end portion by hooking it on the flange portion such as a corner of an H steel flange;
It is not particularly limited. By adopting the above method, after the hydraulic composition is cured, substantially only the temporary buried object can be effectively extracted from the cured body of the hydraulic composition.

When the temporary embedding material is coated with the adhesion preventing material, it is more preferable that the adhesion preventing material is coated along the shape of the temporary embedding material. This further improves the positioning accuracy (driving accuracy) when the covered temporary buried object is built (temporarily buried). Therefore,
Among the above-mentioned methods, a method of inserting the bag-like or tubular anti-adhesion material (covering material) into the temporary buried object so that it can be worn from below, and the method described above. Since the method of wrapping the temporary buried object in the sheet-shaped covering material is excellent in the workability of the covering work,
More preferable.

Furthermore, a layer or a layer made of a mixture of a water-absorbent resin and a hydrophobic lubricant such as an adhesive semi-solid lubricant (eg grease) is formed on the inner surface from the bottom of the temporary buried object lifted by a crane or the like. Put a bag-shaped or tubular anti-adhesive material on which a hydrophobic lubricating layer or the like made of an adhesive semi-solid lubricant is formed, and further hang up the anti-adhesive material to coat the temporary buried object, and then, Once the temporary embedding material is laid down, the adhesion preventing material is used by using an automatic or manual roller or stepping on the foot, and the adhesion (adhesiveness) of the hydrophobic lubricant component is used on the surface of the temporary embedding material. A more preferable method is to bring them into close contact with each other. As a method of bringing the anti-adhesion material into close contact with the surface of the temporary embedding material, a method of rubbing the anti-adhesion material with a foot is particularly preferable from the viewpoint of workability.

Further, the anti-adhesion material may be brought into close contact with an automatic or manual dedicated roller jig while the temporary buried object is suspended. Further, a method of adhering the anti-adhesion material by a manual operation at the same time as the building or by using an automatic or manual dedicated roller jig (a method of driving while adhering to the temporary embedding material) is also preferable. Further, instead of artificially adhering with a roller or the like, it is possible to naturally adhere the above-mentioned anti-adhesion material by hydraulic pressure of the hydraulic composition at the time of building.

As a method of forming the above-mentioned anti-adhesive material in the shape of a bag or a cylinder, specifically, for example, a sheet-like anti-adhesive material is folded in two, and the end portions are joined together and the end portions are joined together. Method of bonding with an adhesive; by heat sealing,
Various methods such as a method of fusing the above-mentioned end portions; a method of sewing the above-mentioned end portions; a method of binding with a string made of a biodegradable material, etc. can be adopted, but from the viewpoint of the strength of the product The sewing process of sewing is particularly preferable.

When the temporary embedding material is coated with the anti-adhesion material, it is desirable to use one (one) anti-adhesion material for one temporary embedding material. It is also possible to use two (two) or more anti-adhesion materials for one temporary buried object. Therefore, as a method of covering the temporary embedding material with the anti-adhesion material, for example, a method of sandwiching the temporary embedding material with two sheet of anti-adhesion material may be adopted.

The time for coating the temporary buried object with the adhesion preventive material is not particularly limited, and may be an appropriate time until the temporary buried object is carried to the work site.
It may be an appropriate time while the temporary buried object is stored at the work site, and it may be an appropriate time before the work of bringing the temporary buried object into contact with the hydraulic composition (temporary buried). May be. The temporary embedding material may be coated with the adhesion preventive material at the time of contact (temporary embedding) with the hydraulic composition.

The following is a description of one embodiment of the present invention.
This will be described in more detail with reference to FIG. As shown in FIG. 1, a ground foundation structure as a structure according to the present embodiment is embedded in the ground 11, and a hydrate of a hydraulic composition (hereinafter, referred to as a hydraulic composition hydrate). 12),
It is composed of a temporary buried object 13. The above-mentioned ground foundation structure is, for example, a temporary buried object 1 formed by forming an excavation hole in the ground 11.
After loosely inserting 3, the hydraulic composition hydrate (cured body of the hydraulic composition) 12 is obtained by placing the hydraulic composition around the temporary embedding material 13 and hydrating (curing) it. To form or
Alternatively, it is constructed by embedding the temporary embedding material 13 in the hydraulic composition cast in the drilled hole and then hydrating the hydraulic composition to form the hydraulic composition hydrate 12. There is.

The temporary buried object 13 is covered with the adhesion preventive material 14 by the above-mentioned method prior to the execution of the above construction. As described above, the anti-adhesion material 14 preferably has a structure in which the hydrophobic lubricating layer and / or the resin layer is formed on the surface of the base material using the aliphatic polyester as a raw material. preferable. Instead of forming the hydrophobic lubricating layer and / or the resin layer on the adhesion preventive material, the hydrophobic lubricating layer or the resin layer may be formed on the surface of the temporary buried object.

In the above structure, the adhesion preventing material 14
When contacted with the alkaline water contained in the hydraulic composition,
The aliphatic polyester as the base material is gradually biodegraded and completely disappears or disintegrates after the hydration of the hydraulic composition is completed. Therefore, after the aliphatic polyester of the base material disappears or disintegrates, the hydraulic composition hydrate 12
And the surface of the temporary buried object 13 between the above-mentioned adhesion preventive material 14
Instead of the base material or the anti-adhesion material 14, a space (gap) is formed by the disappearance or collapse of the base material (adhesion prevention material 14). This can reduce the labor (tensile force) in the work of pulling out the temporary buried object 13 from the hydraulic composition hydrate 12.
The workability of the work can be improved.

When the anti-adhesion material 14 is provided with the hydrophobic lubricating layer, the hydraulic composition hydrate 12 and the temporary embedding material 13 are prepared after the hydration of the hydraulic composition is completed.
Since the hydrophobic lubricating layer is formed between the surface and the surface, the temporary embedding material 13 becomes slippery when the temporary embedding material 13 is pulled out from the hydraulic composition hydrate 12. Therefore, the labor (pulling force) in the work of pulling out the temporary buried product 13 from the hydraulic composition hydrate 12 can be further reduced, and the workability of the work can be improved. The hydrophobic lubricant that forms the hydrophobic lubricating layer, due to its adhesive force, contacts the surface of the hydrophobic lubricating layer even after the base material (the adhesion preventive material 14) disappears or collapses, for example, a temporary buried object. It remains attached to the surface of 13 and is retained, and exhibits a lubricating effect. Therefore, the labor (tensile force) in the work of pulling out the temporary buried object 13 from the hydraulic composition hydrate 12 can be further reduced.

When the anti-adhesion material 14 is provided with the resin layer, after the hydration of the hydraulic composition is completed, the hydration of the hydraulic composition 12 and the surface of the temporary embedding material 13 are prevented. In between, a layer of a water-absorbent resin swelled by absorbing water is formed. That is, since a layer of the swollen water-absorbent resin is formed between the hydraulic composition hydrate 12 and the surface of the temporary embedding material 13, the adhesion between the two can be suppressed. Furthermore, for example, when the temporary embedding material 13 is extracted from the hydraulic composition hydrate 12 before the base material (the adhesion preventive material 14) disappears or collapses, for example, the water-absorbent resin in which the resin layer is swollen is lubricated. By exhibiting the effect, the temporary buried object 13 becomes slippery. Therefore, the labor (pulling force) in the work of pulling out the temporary buried product 13 from the hydraulic composition hydrate 12 can be further reduced, and the workability of the work can be improved. Further, by drying the water absorbent resin, a gap can be further formed between the hydraulic composition hydrate 12 and the surface of the temporary embedding material 13. As a result, the withdrawal property of the temporary buried object 13 is further improved.

Then, the anti-adhesion material 14 has its surface,
That is, when the resin layer is provided on the outer side of the base material, the labor (tensile force) in the work of pulling out the temporary buried object 13 from the hydraulic composition hydrate 12 even after the base material disappears or collapses It can be further reduced and the workability of the work can be improved.

As described above, according to the above configuration, there are provided an adhesion preventing method and an extracting method for a temporary buried object, and an adhesion preventing material which can be suitably used for the ground foundation structure (structure). be able to.

The temporary embedding material that is extracted from the cured body of the hydraulic composition (hydraulic composition hydrate) and recovered can be reused as it is. The temporary buried object is
In many cases, after the anti-adhesion material disappears or collapses due to biodegradation of the aliphatic polyester, it is extracted, and after extraction of the temporary embedding material, in the cured body (structure) of the hydraulic composition, Nothing remains, or only the residue of the anti-adhesion material remains. According to the present invention, since a gap (space portion) is formed between the cured body of the hydraulic composition and the temporary embedding material, the labor required for extracting the temporary embedding material can be small, and the removability can be improved. And the pollution of dust can be reduced.

The anti-adhesion material will remain in the cured body (structure) of the hydraulic composition even after the temporary embedding material is pulled out. However, the aliphatic polyester in the anti-adhesion material is used for a short period of time. Since it is biodegraded at 1, the above-mentioned anti-adhesion material disappears or collapses, it can be left as it is.

When the temporary embedding material is pulled out from the cured body of the hydraulic composition, a cavity (hole) having a shape substantially the same as the shape of the temporary embedding material is formed in the structure. The cavity can be used, for example, as a drain.
Moreover, an electric wire, a gas pipe, a water pipe, or the like can be inserted into the cavity.

The structure according to the present invention may be a base for installing road signs and the like. In other words, by forming a structure using an embedded object of a size (shape, length, etc.) corresponding to the embedded portion of the road sign that is desired to be installed, by pulling out the embedded object and inserting the road sign. , Road signs can be installed.

[0123]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these.

Example 1 First, an alkaline water-soluble resin was prepared by the following method. First, a thermometer, a stirring blade,
In a 50 L capacity tank reactor equipped with a reflux condenser and a dropping device, 0.45 kg of acrylic acid, 2.4 kg of ethyl acrylate, 0.15 kg of methyl methacrylate, and 2,2′-azobis which is a polymerization initiator. 28 g of-(2,4-dimethylvaleronitrile) and 7 kg of methyl alcohol
A mixed solution consisting of was prepared to obtain a methyl alcohol solution. Next, the above methyl alcohol solution was heated to 65 ° C. with stirring under a nitrogen gas atmosphere and reacted for 20 minutes. Thereby, the polymerization rate of the content was adjusted to 72%.
Subsequently, while maintaining the internal temperature at 65 ° C., the above mixed solution was uniformly added dropwise over 2 hours from the dropping device. After the dropping was completed, the contents were 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 wt% methyl alcohol solution of the alkaline water-soluble resin (A).

The acid value of the obtained alkaline water-soluble resin (A) was 117 mgKOH / g. Moreover, as a result of carrying out a differential scanning calorimetry of the alkaline water-soluble resin (A), the alkaline water-soluble resin (A) has two glass transition temperatures in the range of −80 ° C. to 120 ° C. Was there.

Then, the above alkaline water-soluble resin (A)
150 parts by weight of a 33% by weight methyl alcohol solution and a commercially available polyacrylic acid sodium salt crosslinked product as a water-absorbent resin (a) (trade name "AQUALIC ML-70"; manufactured by Nippon Shokubai Co., Ltd., average particle diameter 50 μm). ) 50 parts by weight was mixed and dispersed to obtain a water absorbent resin dispersion (i).

The weight ratio of the water-absorbent resin (a) to the alkali-water-soluble resin (A) in the water-absorbent resin dispersion (i) (water-absorbent resin / alkali-water-soluble resin) is 1/1.
Met.

Next, based on JIS K 6953,
The time required for the shape to collapse is 60 ° C.
Polylactic acid non-woven fabric within 30 days in post (brand name
"Terramac ST200S00"; Unitika Ltd.
Made, basis weight (basis weight) 200 g / m ², Thickness 4.5mm, pull
Tensile strength 117.6 N / 5 cm) biodegradable sheet-like substrate
The surface of this biodegradable sheet-like substrate (piece
Surface) with the water-absorbent resin dispersion (i) on the water-absorbent resin
Adhesion amount of fat (a) is 45 g / m in terms of solid content², Alkaline water
Soluble resin (A) adhesion amount is 45 g / m in solid content²Tona
And then dried. As a result, the water absorption
Including a resin (a) and an alkaline water-soluble resin (A),
Biodegradability with a resin layer (I) having a thickness of about 0.2 mm formed
A sheet-shaped substrate was obtained.

Then, two pieces of the biodegradable sheet-shaped substrate on which the resin layer (I) is formed are sewn together so that the resin layer (I) is on the outer side, and a width of 700 m is obtained.
A bag-shaped covering material (1) having m × height of 1200 mm was produced.

Then, in this bag-shaped covering material (1), an H-shaped steel (H-100 × 100, length 1 m, as a temporary buried object,
"Construction Price" substrate) was inserted.

On the other hand, water, cement, clay and bentonite were mixed at a weight ratio of 25: 6: 16: 0.6 to prepare soil cement milk as a hydraulic composition, and put in a container for measurement. Injected.

Next, after the H-shaped steel covered with the bag-like covering material (1) was driven into the soil cement milk, the soil cement milk was cured. That is, the bag-shaped covering material (1) was embedded in the soil cement milk.

Next, the H-section steel on which the hydrophobic lubricant layer (III) was formed was hammered into the soil cement milk to cure the soil cement milk.

For 30 days (6
After the passage (under 0 ° C.), the H-section steel was pulled out from the hardened soil cement milk using a tensile tester. The withdrawal load required for the withdrawing operation was 206 N, and the H-section steel could be extracted extremely easily from the hardened material of soil cement milk.

After the measurement, the lump of the hardened soil cement was broken and the collapsed state of the bag-like covering material (1) was observed. As a result, the bag-like shape was almost completely collapsed.

Example 2 The same polylactic acid nonwoven fabric “Terramac ST200S00” as in Example 1 was used as a biodegradable sheet-like substrate, and the surface (one side) of this biodegradable sheet-like substrate was used as an example. The water-absorbent resin dispersion (i) prepared in the same manner as in Example 1 was treated with the water-absorbent resin (a) having a solid content of 45 g / m ² and the alkaline water-soluble resin (A) having a solid content. It was applied at 45 g / m ² and dried. Next, on the back surface of the biodegradable sheet-shaped substrate, a semi-solid hydrophobic lubricant (mixing consistency 3
0 to 170), a light brown, hard, sticky (semi-solid) grease (trade name "Nigrider TN-2";
Nippon Grease Co., Ltd., melting point 75.6 ° C., consistency 85,
Viscosity 17.0 μm ² / s (100 ° C.), flash point 280
(° C.) was applied so that the adhesion amount would be 300 g / m ² . As a result, a resin layer (I) having a thickness of about 0.2 mm containing the water-absorbent resin (a) and the alkaline water-soluble resin (A) is formed on one surface (surface) of the biodegradable sheet-shaped substrate. , The other surface (back surface) of the biodegradable sheet-shaped substrate
And a thickness of about 0.3 comprising the above semi-solid hydrophobic lubricant.
A biodegradable sheet-like base material having a mm hydrophobic hydrophobic layer (II) was obtained.

Next, the above-mentioned biodegradable sheet-like substrate on which the resin layer (I) and the hydrophobic lubricating layer (II) are formed,
The resin layer (I) is outside (the hydrophobic lubricating layer (II) is inside)
Width 70 by sewing two pieces so that
A bag-shaped covering material (2) having a size of 0 mm and a height of 1200 mm was produced.

Then, the same H-section steel as in Example 1 was inserted into this bag-shaped covering material (2) as a temporary buried object.

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a container for measurement.

Next, after the H-shaped steel covered with the bag-like covering material (2) was driven into the soil cement milk, the soil cement milk was cured.

For 30 days (6
After the passage (under 0 ° C.), the H-section steel was pulled out from the hardened soil cement milk using a tensile tester. The withdrawal load required for the withdrawal work was 176 N, and the H-section steel could be extracted extremely easily from the hardened material of soil cement milk.

After the measurement, the lump of the hardened soil cement was broken and the collapsed state of the bag-like covering material (2) was observed. As a result, the bag-like shape was almost completely collapsed.

Example 3 The same polylactic acid nonwoven fabric “Terramac ST200S00” as in Example 1 was used as a biodegradable sheet-like substrate, and this biodegradable sheet-like substrate was
700 mm width x 120 height by stitching together
A 0 mm bag-shaped covering material (3) was produced.

Then, the same H-section steel as in Example 1 was inserted into this bag-shaped covering material (3) as a temporary buried object.

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a measuring container.

Next, the H-section steel coated with the bag-like coating material (3) was driven into the soil cement milk, and then the soil cement milk was cured.

For 30 days (6
After the passage (under 0 ° C.), the H-section steel was pulled out from the hardened soil cement milk using a tensile tester. The withdrawal load required for the withdrawing work was 588 N, and the H-section steel could be easily withdrawn from the cured product of soil cement milk.

After the measurement, the lumps of the hardened soil cement were broken and the collapsed state of the bag-like covering material 3 was observed. As a result, the bag-like shape was almost completely collapsed.

Comparative Example 1 A woven fabric having a width of 1250 mm, a weight ratio of polyester to rayon (polyester / rayon) of 60/40 and a basis weight of 160 g / m ² was used as a sheet-like substrate. On the surface (one side) of this sheet-shaped substrate, the water-absorbent resin dispersion liquid (i) prepared in the same manner as in Example 1 was added, and the amount of the water-absorbent resin (a) deposited was 45 g / m ² in terms of solid content, The alkaline water-soluble resin (A) was coated and dried so that the solid content was 45 g / m ² . As a result, a comparative sheet-like base material (X) was obtained in which the resin layer (I) containing the water absorbent resin (a) and the alkaline water-soluble resin (A) and having a thickness of about 0.2 mm was formed. .

Next, two sheets of the comparative sheet-like base material (X) having the resin layer (I) formed thereon are sewn together so that the resin layer (I) is on the outside, so that the width 7
00 mm x 1200 mm high bag-shaped covering material for comparison (1)
Was produced.

Then, the comparison bag-shaped covering material (1) was
The H-section steel similar to that in Example 1 was inserted as a temporary buried object.

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a measuring container.

Next, the H-section steel coated with the comparative bag-shaped coating material (1) was driven into the soil cement milk, and then the soil cement milk was cured.

For 30 days (6
After the passage (under 0 ° C.), the H-section steel was pulled out from the hardened soil cement milk using a tensile tester. The withdrawal load required for the withdrawing work was 255 N, and the H-section steel could be easily withdrawn from the cured product of soil cement milk.

However, after the measurement, the lump of the hardened soil cement was broken to observe the collapsed state of the shape of the comparative bag-shaped covering material (1). It was left.

[Comparative Example 2] A wax (trade name "Hislide WAX TAP-2"; manufactured by PALACE CHEMICAL CO., LTD.) As a hydrophobic lubricant was thickly applied to the entire surface of the H-section steel similar to that in Example 1. A hydrophobic lubricant layer (III) was formed on both surfaces of the H-section steel by uniformly applying the solution to a thickness of 1 mm.

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a measuring container.

Next, the H-section steel on which the hydrophobic lubricant layer (III) was formed was driven into the soil cement milk, and then the soil cement milk was cured.

Thirty days after the H-section steel was driven in, the H-section steel was pulled out from the hardened soil cement milk using a tensile tester. The withdrawal load required for the withdrawing operation was 5700 N, and the above H-section steel could not be easily withdrawn from the hardened material of soil cement milk.

Comparative Example 3 The width of 1250 used in Comparative Example 1 in place of the biodegradable sheet-shaped substrate in Example 3 was used.
mm, weight ratio of polyester to rayon (polyester / rayon) 60/40, basis weight 160 g / m ²
Example 3 except that a sheet-like substrate made of the woven fabric of
A bag-shaped covering material for comparison (2) was prepared in the same manner as in.

Then, the comparison bag-shaped covering material (2) was
The H-section steel similar to that in Example 1 was inserted as a temporary buried object.

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a measuring container.

Next, the H-section steel coated with the comparative bag-shaped coating material (2) was driven into the soil cement milk, and then the soil cement milk was cured.

For 30 days (6
After the passage (under 0 ° C.), the above H-section steel coated with the above comparative bag-like coating material (2) was pulled out from the cured product of soil cement milk using a tensile tester. The pulling load required for the pulling operation was 784N. Also, the above H
After drawing out the shaped steel, the collapsed state of the shape of the comparative bag-shaped covering material (2) was observed, but the collapse did not progress much, and the bag-shaped form remained.

[Comparative Example 4] As a comparative covering material, the resin material (I) having a thickness of about 0.2 mm was formed on the surface (one surface) of the sheet-shaped substrate used in Comparative Example 1 for comparison. The sheet-like base material (X) for comparison was used, and this sheet-like base material (X) for comparison was applied to a vinyl chloride resin adhesive (for bond vinyl) on the entire surface of the H-section steel as in Example 1. , Manufactured by Konishi Co., Ltd.).

On the other hand, as a hydraulic composition, the same soil cement milk as in Example 1 was prepared and poured into a measuring container.

Next, the H-shaped steel to which the sheet-like base material (X) for comparison was attached was driven into the soil cement milk, and then the soil cement milk was cured.

[0168] For 30 days (6
(Under 0 ° C.), the above H-shaped steel covered with the comparative sheet-shaped base material (X), together with the comparative sheet-shaped base material (X), from a cured product of soil cement milk, It was pulled out using a tensile tester. The pulling load required for the pulling operation was 1470N. Further, after the H-shaped steel was drawn out, the collapsed state of the shape of the comparative sheet-like base material (X) was observed, but the collapse was hardly progressed,
It remained in the form of a bag.

[0169]

As described above, the method for preventing the adhesion of a temporary embedding material according to the present invention cures the cured body of the hydraulic composition and the hydraulic composition by provisionally embedding it in the hydraulic composition. A method for preventing adhesion with a temporary embedding material that is subsequently withdrawn from a cured body of the hydraulic composition, wherein the temporary embedding material is covered with an adhesion preventive material including a base material using an aliphatic polyester as a raw material. Is the way to do it.

Further, as described above, the method of extracting the temporary embedding material according to the present invention comprises temporarily embedding the temporary embedding material in the hydraulic composition, and after curing the hydraulic composition, curing the hydraulic composition. A method of extracting the temporary embedding material from a cured body, wherein the temporary embedding material is temporarily embedded in a hydraulic composition by coating with an anti-adhesive material having a base material using an aliphatic polyester as a raw material, After curing the hydraulic composition, substantially only the temporary embedding material is extracted from the cured body of the hydraulic composition.

The aliphatic polyester is very excellent in biodegradability in the hydraulic composition. Therefore, according to the above method, before the biodegradation of the aliphatic polyester, to prevent direct contact between the temporary embedding material and the hydraulic composition, after biodegradation, the temporary embedding material and the hydraulic composition. There is an effect that a space portion (gap) is formed between the cured product and the cured product, the work of pulling out the temporary buried object from the cured product of the hydraulic composition is facilitated, and the workability of this work can be improved.

Further, since the aliphatic polyester is excellent in biodegradability in the hydraulic composition, the above-mentioned anti-adhesion material is left as a coarse dust even when left in the cured body of the hydraulic composition part. It does not remain in the cured product of the hydraulic composition for a long period of time. Further, by using the above method, when the temporary embedding material is extracted from the cured body of the hydraulic composition, the temporary embedding material is extracted from the cured body of the hydraulic composition together with the base material, that is, the adhesion preventive material. No need. Therefore, it is not necessary to secure or add a disposal place to dispose of the above-mentioned anti-adhesion material, and it does not remain as coarse dust in the cured body of the hydraulic composition for a long period of time. Therefore, according to the above method, it is possible to reduce the pollution of dust.

As described above, the method of preventing adhesion of a temporary buried object according to the present invention is a method of using, as the above-mentioned adhesion preventing material, an adhesion preventing material having a resin layer containing a water absorbent resin. is there. Furthermore, the method for preventing adhesion of the temporary embedding material according to the present invention is a method of coating the temporary embedding material so that the resin layer is on the outside of the base material as described above.

As described above, the adhesion preventive material according to the present invention is temporarily embedded in a cured product of the hydraulic composition and the hydraulic composition, and after the hydraulic composition is cured, the hydraulic composition is cured. An adhesion preventive material for preventing adhesion to a temporary embedding material that is pulled out from a cured product of a composition, comprising a base material using an aliphatic polyester as a raw material, and a resin layer containing a water-absorbent resin. is there. Further, as described above, the anti-adhesion material according to the present invention is configured such that the resin layer is provided on at least the surface which is the outer side when the temporary buried object is covered with the anti-adhesion material.

Since the above-mentioned adhesion preventive material is provided with the above-mentioned resin layer, between the cured product of the hydraulic composition and the temporary embedding material,
A layer of a water-absorbent resin that swells by absorbing water is formed. The layer of the swollen water-absorbent resin suppresses adhesion between the cured body of the hydraulic composition and the temporary embedding, and exhibits a lubricating effect when the temporary embedment is pulled out from the cured body of the hydraulic composition. .
Therefore, according to each of the above configurations, there is an effect that the frictional resistance force when pulling out the temporary buried object can be further reduced.

Further, the resin layer is provided at least on a surface which is an outer side when the temporary embedding material is covered with the anti-adhesion material. In other words, the temporary embedding material is provided with the resin layer. By covering the base material so as to be outside, by the synergistic effect of the base material and the resin layer,
The effect of facilitating the work of pulling out the temporary buried material from the cured product of the hydraulic composition and remarkably improving the workability of this work is exhibited.

As described above, in the adhesion preventive material according to the present invention, the resin layer further contains an alkaline water-soluble resin having an acid value of 15 mgKOH / g or more and 500 mgKOH / g or less. Is.

The alkaline water-soluble resin functions as a bonding agent for adhering the water-absorbent resin to the above-mentioned base material, is solubilized when contacted with alkaline water such as cement water, and does not impair the water-absorption swellability of the water-absorbent resin. . Furthermore, the alkaline water-soluble resin has excellent coating properties and firmly adheres (attaches) to the substrate.
However, it is possible to prevent the water absorbent resin from falling off before or during construction due to unexpected water wetness / rainfall (including acid rain). Therefore, according to the above configuration,
The effect that the labor (tensile force) in the work of pulling out the temporary buried object from the cured product of the hydraulic composition can be further reduced.

As described above, the anti-adhesion material according to the present invention further comprises a hydrophobic lubricating layer containing a hydrophobic lubricant.

According to the above structure, the adhesion preventing material is
Since the adhesive property (adhesiveness) of the hydrophobic lubricating layer can be used to adhere (paste) to the temporary embedding material, the temporary embedding material coated with the anti-adhesion material in the hydraulic composition can be used. During temporary embedding, the temporary embedding material can be coated with the anti-adhesion material without biodegrading and leaving a fixture that will become garbage in the future in the hydraulic composition. The above-mentioned adhesion preventive material can be brought into close contact with the above-mentioned temporary embedding material to cover it, and it is possible to alleviate dust pollution and improve the workability when the temporary embedding material is set up. Further, according to the above configuration, the hydrophobic lubricating layer also has the effect of reducing the frictional resistance when the temporary buried object is pulled out.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a ground foundation structure as a structure according to an embodiment of the present invention.

2 (a) and 2 (b) are perspective views showing a procedure for covering a temporary buried object with an adhesion preventive material according to an embodiment of the present invention.

3 (a) to 3 (c) are perspective views showing a procedure for covering a temporary buried object with an adhesion preventive material according to another embodiment of the present invention.

[Explanation of symbols]

1 coating material 2 Temporary buried objects 10 coating material 11 ground 12 Hydraulic composition hydrate (cured body of hydraulic composition) 13 Temporary buried objects 14 Anti-adhesion material

Claims (8)

[Claims] 1. Adhesion between a cured product of a hydraulic composition and a temporary embedded product which is temporarily embedded in the hydraulic composition and is withdrawn from the cured product of the hydraulic composition after curing the hydraulic composition. A method of preventing adhesion of a temporary buried object, comprising: covering the above-mentioned temporary buried object with an adhesion preventive material having a base material using an aliphatic polyester as a raw material. 2. The method for preventing adhesion of a temporary buried object according to claim 1, wherein an adhesion prevention material having a resin layer containing a water-absorbent resin is further used as the adhesion prevention material. 3. The method for preventing adhesion of a temporary buried object according to claim 2, wherein the temporary buried object is covered so that the resin layer is outside the base material. 4. A method of temporarily embedding a temporary embedding material in a hydraulic composition, and extracting the temporary embedding material from a cured body of the hydraulic composition after the hydraulic composition has been cured. The object is coated with an anti-adhesive material having a base material using an aliphatic polyester as a raw material and temporarily embedded in a hydraulic composition, and after curing the hydraulic composition, a cured product of the hydraulic composition. A method for extracting a temporary buried object, wherein substantially only the temporary buried object is extracted from the above. 5. Adhesion between a cured product of a hydraulic composition and a temporary embedded product that is temporarily embedded in the hydraulic composition and is withdrawn from the cured product of the hydraulic composition after curing the hydraulic composition. An anti-adhesion material, comprising: a base material using an aliphatic polyester as a raw material; and a resin layer containing a water-absorbent resin. 6. The resin layer has an acid value of 15 mgKOH / g.
The anti-adhesion material according to claim 5, further comprising an alkaline water-soluble resin in the range of 500 mgKOH / g or less. 7. The adhesion preventive material according to claim 5, further comprising a hydrophobic lubricating layer containing a hydrophobic lubricant. 8. The resin layer is provided at least on a surface which is an outer side when the temporary buried object is covered with the adhesion preventive material, according to any one of claims 5 to 7. The anti-adhesion material described in.