KR100960207B1 - Protective sheet for concrete structure of civil engineering structure and building structure and Protective method using thereof - Google Patents

Abstract

The protective sheet used for attaching to the surface of the civil structure and the building structure by waterproofing the concrete structure in the civil structure and the building structure and protecting the surface thereof, and the method of protecting the civil structure and the building structure using the protective sheet. Provide technology.

Civil engineering structures and building structures 1 are, for example, concrete structures or steel structures. The protective sheet 2 attached to the surface 1a of the civil and building structures 1 includes a weatherproof film 2a and an adhesive layer 2b attached to one side of the weatherproof film 2a. Consists of sheets.

Description

Protective sheet for concrete structure of civil engineering structure and building structure and protective method using

BRIEF DESCRIPTION OF THE DRAWINGS The structural schematic diagram which shows one example of embodiment in the protection sheet of the concrete structure in the civil engineering structure and building structure which concerns on this invention, and the protection method using the said protection sheet.

2 is a schematic view showing another example of an embodiment in a protective sheet for a concrete structure and a protective method using the protective sheet in a civil engineering structure and a building structure according to the present invention.

FIG. 3 is a view illustrating the strength or crack followability test of a concrete embodiment and the attachment of a protective sheet in a protective sheet of a concrete structure and a protective method using the protective sheet in a civil structure and a building structure according to the present invention. (a) is a block diagram and (b) is a figure which shows test conditions.

Fig. 4 shows test results in the test examples shown in Figs. 3A and 3B. The test results show the data of the adhesion test of the pressure-sensitive adhesive sheet. .

5 is a view illustrating a crack followability test of a concrete embodiment and a protective sheet in a protection sheet for a concrete structure and a protection method using the protection sheet in the civil and building structures according to the present invention. The configuration diagram and (b) are diagrams showing test conditions.

6 is a first crack followability test data diagram for the test example shown in FIGS. 5A and 5B.

FIG. 7 is a second crack followability test data diagram for the test example shown in FIGS. 5A and 5B.

8 is a cross-sectional view showing a state in which a repair / reinforcement sheet according to the related art is attached to a surface of a concrete structure.

<Description of the symbols for the main parts of the drawings>

1: Civil structure and building structure (concrete)

1a: Surfaces of civil and architectural structures

2: protective sheet

2a: weather resistant fluorine film

2b: adhesive layer (adhesive sheet)

2c: primer

2d: putty

The present invention relates to a protective sheet used for the protection of civil and structural structures consisting of bridges, tunnels, chimneys, concrete or steel structures of buildings, railways and roads, and a protection method using the protective sheets.

Conventionally, for example, concrete structures such as bridges, tunnels, and chimneys formed of concrete have caused cracks due to repetition of external force, intrusion of water, change of temperature, etc. over time, causing aging. In addition, in the coating applied to the surface of the steel structure for the purpose of rust prevention, the coating is immersed due to deterioration of the coating due to changes in temperature, vibration, or the like over time, causing aging. The crack which occurred in the conventional concrete was repaired by formation of the waterproof layer by injection of a repair agent, painting, etc. In addition, repair of steel structures has been performed by methods such as repainting.

As another example in the prior art, there is a technique for repairing / reinforcing a concrete structure sheet and a method for repairing / reinforcing a concrete structure disclosed in Japanese Patent Laid-Open No. 2002-256707.

Referring to FIG. 8, 4 is a sheet for repair and reinforcement, and is attached to the concrete structure 5. The repair / reinforcement sheet 4 is coated with a polyvinylidene fluoride film as the protective layer 4a and a urethane-based liquid curing adhesive as a laminate adhesive 4b and dried to form a vinylon triaxial mesh as the reinforcing layer 4c. The spunbonded nonwoven fabric made of polyester fiber as the adhesion layer 4d is laminated and dry laminated, and adhered to the concrete structure 5 as the construction adhesive 4e at the site.

Thus, for example, the surface of the concrete structure 5 is subjected to the latent treatment and the dead skin modification using a disk sander or the like, and then coated with a primer agent and dried, and then the adhesive for construction on this surface. As (4e), an epoxy resin adhesive is applied. It adhered to this surface through the adhesion layer 4d of the sheet | seat 4 for repair and reinforcement of the concrete structure 5 mentioned above. When the adhesive 4e for construction is impregnated in the adhesion layer 4d and hardened | cured, the sheet | seat 4 for repair and reinforcement of the concrete structure 5 will adhere firmly to the surface of the concrete structure 5.

[Patent Document 1]

Japanese Patent Publication 2002-256707 Patent Publication

The prior art has the following problems because of the above-described configuration and operation.

In the conventional repair method, in particular, in areas where stress is generated constantly or intermittently in bridges, box cuts, etc. of railroads or roads, maintaining the maintenance over time does not increase the cost of maintenance. It is a phenomenon that intrusion of water and recurrence of cracks are unavoidable, and it is a phenomenon that a change in temperature is caused when a crack occurs on the painted surface of a civil structure and a building structure, for example, a concrete structure or a steel structure. Cracking recurs or enlarges due to stress generated in structural members due to anti-freezing, alkali aggregate reaction, and the like, and the reinforcing steel or tension steels constituting the structural member by leakage of rain or the like from the part of the crack. Corrosion progresses and concrete is destroyed by freezing and thawing such as rain water submerged in the cracked portion, and durability of the structural member There is a problem that significantly reduced. In addition, in particular, in the case of concrete structures, there is a problem that attracts the fall of the concrete piece.

In addition, according to the technique disclosed in Japanese Patent Laid-Open No. 2002-256707 in the above-described conventional technique, various protective layers in which the repair / reinforcement sheet 4 adhered to the surface of the concrete structure 5 is formed in multiple layers. (4a) or the adhesive 4b, the reinforcing layer 4c, the adhesion layer 4d, etc. are laminated | stacked, and there existed a problem that the lamination order and the construction method were complicated, time-consuming, and the length of repair work was long. . In addition, when the repair / reinforcement sheet 4 is attached to the upper surface of the concrete structure 5, the repair / reinforcement sheet 4 has a thickness of the repair / reinforcement sheet 4 from the original. There is a problem in that it does not have a tackiness called itself a soaking feeling, and it is impossible to prevent a crack phenomenon on the surface of the concrete structure 5 disposed below.

In the civil and structural structures of the present invention, a protective sheet for a concrete structure and a protective method using the protective sheet are provided with a waterproofing treatment for a civil structure and a building structure in order to solve the above problems. It is an object of the present invention to provide a protective sheet used by attaching to a surface of a building structure to be protected, and to provide a method of protecting a civil structure and the building structure using the protective sheet.
That is, according to the invention of claim 1, when repairing a concrete structure in a civil structure and a building structure in which a crack occurs, the surface area of the concrete structure in the civil structure and the building structure is subjected to a base treatment, and a primer is applied. A protective sheet having flexibility to be attached later, wherein the protective sheet is formed of a weatherproof film substrate and one side of the weatherproof film substrate, and is composed of a pressure-sensitive adhesive layer having flexibility before and after attachment, and a pressure-sensitive adhesive layer having flexibility before and after the attachment. Is a pressure-sensitive adhesive and is composed of a (co) polymer having (meth) acrylic acid alkyl ester as the main monomer, wherein hollow microspheres of inorganic or organic filler are added to the pressure-sensitive adhesive layer.
According to invention of Claim 2, a weather resistant film base material is a fluororesin film, It is characterized by the above-mentioned.

According to the invention as set forth in claim 3, in the civil and structural structures in which the crack has occurred, the dirt or deposits on the surface of the concrete structure are removed, and a predetermined amount of the primer is applied, and the above-mentioned claim 1 or The protective sheet of the concrete structure in the civil and structural structures described in claim 2 is attached to the surface of the primer.

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[Embodiment Mode]

EMBODIMENT OF THE INVENTION Hereinafter, embodiment in the protective sheet of the concrete structure and the protection method using the said protective sheet in the civil engineering structure and building structure which concern on this invention is described in detail based on an accompanying drawing.

In FIG. 1, 1 is a civil engineering structure and a building structure, for example, a concrete structure or a steel structure. 2 is a protective sheet attached to the surface 1a of the civil engineering structure and the building structure 1. In addition, as shown in FIG. 2, the said protective sheet 2 is comprised from the weatherproof film 2a and the adhesive layer 2b formed in one surface of the said weatherable film 2a, ie, an adhesive sheet.

In the present invention, civil structures and building structures (1) refers to the entire civil structure and building structure (1) including concrete structures and steel structures. Concrete structures and steel structures mean one of concrete structures and steel structures. For example, concrete structures such as bridges of railways and roads, tunnels, chimneys, buildings, and various structures using reinforcing steel, steel, tension steel, etc. The specific object is not particularly limited.

In the present invention, the protection means protection of the civil engineering structure and the building structure 1, for example, the surface of the concrete surface 1a in a concrete structure, the surface of steel frames, etc. in a steel structure. On the other hand, in addition to the case where concrete or steel frame is directly exposed to the surface of the concrete surface 1a or steel frame, for example, even if the surface of the concrete surface 1a or steel frame is subjected to surface treatment such as painting, etc. good.

In addition, the protective sheet 2 of the present invention is intended to provide temporary protection during the construction period when repairing and constructing a civil structure and a building structure 1, for example, a concrete structure and a steel structure. It is not to be used as, for example, it means a film-like or sheet-like member that is used integrally with the concrete structure and steel structure over a long period of one year or more.

The protective sheet (hereinafter simply referred to as a protective sheet) 2 of the concrete structure in the civil structure and the building structure of the present invention is used by being attached to the surface 1a of the concrete structure and the steel structure, for example. The protective sheet 2 is characterized by consisting of an adhesive layer 2b or an adhesive sheet.

The pressure-sensitive adhesive layer 2b includes an adhesive sheet in which a pressure-sensitive adhesive composed of a composition described later in the form of a sheet or a film is formed. For example, the pressure-sensitive adhesive layer 2b has a tackiness as a feeling of turk at normal temperature 23 ° C. The protective sheet of the present invention can be applied to the surface of civil engineering structures and building structures 1, for example, concrete structures and steel structures, by using the adhesiveness of the pressure-sensitive adhesive layer 2b alone.

In addition, the adhesive layer 2b or the adhesive sheet which comprises the protective sheet 2 of this invention shows the property of a viscoelastic body, and the civil engineering structure and building structure 1 in which the surface deteriorated or the crack generate | occur | produced, for example, By attaching to concrete structures, it is possible to prevent infiltration and intrusion into concrete such as rainwater, and to have a waterproof function even if cracks occur or existing cracks progress after attachment, thereby making civil structures and building structures (1) For example, it becomes effective to prevent deterioration of a concrete structure. Moreover, it can also attach to new civil engineering structures and building structures 1, for example, a concrete structure. By attaching to the painted steel structure, it has weather resistance and is effective in preventing deterioration of the steel structure. It can also be attached to steel structures without coating.

In the present invention, the specific material of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2b or the pressure-sensitive adhesive sheet is not particularly limited, and examples thereof include suitable acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, and silicone pressure-sensitive adhesives. Pressure-sensitive adhesives (adhesives) can be used. Especially in this invention, it is especially preferable to use an acryl-type pressure-sensitive adhesive from a point which requires the protection function for a long time.

As the acrylic pressure-sensitive adhesive, the pressure-sensitive adhesive layer (2b) excellent in adhesiveness, water resistance and weather resistance to concrete and steel structures can be easily adjusted by adjusting the monomer (monomer) composition of the (meth) acrylic (co) polymer as the main component. Can be formed.

As an acryl-type pressure sensitive adhesive, the main component contains the (meth) acrylic-type (co) polymer using the (meth) acrylic-acid alkylester represented by following General formula (1) as a main monomer, for example, a (meth) acrylic-type polymer as a main component. . Here, (meth) acrylic-acid alkylester is used as a generic term of acrylic-acid alkylester and methacrylic acid alkylester. In addition, a (meth) acrylic-type (co) polymer means both the homopolymer (homopolymer) of a (meth) acrylic-acid alkylester and the hollow copolymer of a (meth) acrylic-acid alkylester and another monomer.

General formula (1) CH ₂ = C (R ¹ ) COOR ²

In the above formula, R ¹ represents a hydrogen atom or a methyl group, and R ² represents an alkyl group having ² to 14 carbon atoms. As said R <^2> , for example, an ethyl group, a propyl group, isopropyl group, a butyl group, isobutyl, isoamyl group, hexyl group, heptyl group, 2-ethylhexyl group, isooctyl group, isononyl group, isodecyl group Etc. can be illustrated. Especially as R <^2> , a C2-C10 alkyl group, such as a butyl group and 2-ethylhexyl group, is preferable. The said (meth) acrylic-acid alkylester can be used individually or in combination of 2 or more types. Here, content of the (meth) acrylic-acid alkylester in a (meth) acrylic-type copolymer is 60 weight% or more of the whole monomer which comprises a copolymer, for example, an upper limit is 99 weight%, Especially 80 weight% or more This is preferred.

In the (meth) acrylic copolymer, as a copolymerization component (monomer) other than the (meth) acrylic acid alkyl ester, in order to improve the adhesive force to the adherend or to increase the cohesion force of the pressure-sensitive adhesive, a polar group-containing monomer or a polyfunctional monomer, Other hollow synthetic monomers can be used. As said polar group containing monomer, For example, Carboxyl group containing monomers, such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, maleic anhydride, or its acid anhydride; Hydroxyl group-containing monomers such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate; (Meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-metholol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, etc. Amide group-containing monomers; Amino group-containing monomers such as dimethylaminoethyl (meth) acrylate and t-butylaminoethyl (meth) acrylate; Glycidyl group-containing monomers such as glycidyl (meth) acrylate; (Meth) acrylonitrile, N- (meth) acryloyl morpholine, N-vinyl-2-pyrrolidone, etc. are mentioned. Among these, carboxyl group-containing monomers, such as acrylic acid, or an acid anhydride thereof are especially preferable. Said polar group containing monomer can be used 1 type (s) or 2 or more types.

The amount of the polar group-containing monomer is 1 to 30% by weight, preferably 3 to 20% by weight of the entire monomer constituting the hollow copolymer. When the content of the polar group-containing monomer exceeds 30% by weight, the cohesive force tends to be too high, and the pressure-sensitive adhesiveness may be lowered. When the content of the polar group-containing monomer is less than 1% by weight, it is found that the effect of the hollow polymerization is difficult to be obtained.

As said polyfunctional monomer, for example, hexanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) Acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, trimetholpropane tri (meth) acrylate, tetramethylolmentant tree (meth) Acrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, etc. can be used.

The usage-amount of the said polyfunctional monomer is 0.01-2.0 weight part with respect to 100 weight part of said (meth) acrylic-acid alkylesters, Preferably it is 0.02-1.0 weight part. When the amount of the polyfunctional monomer exceeds 2.0 parts by weight, the cohesive force tends to be too high, and the pressure-sensitive adhesiveness may decrease, and when the amount of the multifunctional monomer is less than 0.01 part, the effect of the hollow polymerization is difficult to be obtained.

As said other hollow synthetic monomer, it is methyl (meth) acrylate, for example; Vinyl esters such as vinyl acetate; Aromatic vinyl compounds such as styrene and vinyltoluene; (Meth) acrylic acid ester of cyclic alcohols, such as cyclopentyl (meth) acrylate and isobonyl (meth) acrylate, etc. are mentioned. One or two or more of these hollow synthetic monomers can also be used.

In the acrylic pressure-sensitive adhesive used in the present invention, a polymerization regulator such as lauryl mercaptan or thio glycolic acid, a polyfunctional epoxy compound, a polyfunctional isocyanate compound, a polyfunctional melamine compound for controlling adhesion or cohesion A crosslinking regulator consisting of a polyfunctional compound such as a crosslinking agent, divinylbenzene, ethylene glycol diacrylate, trimethylolpropane trimethacrylate, or the like is blended as necessary. Although the compounding quantity is suitably determined, it is 50 weight part or less, especially 10 weight part or less per 100 weight part of monomer (monomer) components normally.

In the polymerization of a (meth) acrylic-based (co) polymer, a method of polymerization by heat using a thermal polymerization initiator, or a method of polymerization using active energy light (ultraviolet rays, electron beams, etc.) using a photopolymerization initiator, or the like Appropriate polymerization method can be adopted. It is more preferable to superpose | polymerize using active energy ray from the advantage which can shorten superposition | polymerization time.

As the thermal polymerization initiator, benzoyl peroxide, 2,2'-azobisisobutyronitrile or the like can be used.

Examples of the photopolymerization initiator include substituted benzoin ethers such as benzoin ether such as benzoin methyl ether, benzoin isopropyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, anisole methyl ether, Substituted acetophenones, such as 2, 2- diethoxy acetophenone, 2, 2- dimethoxy- 2-phenylacetophenone, and 1-hydroxy cyclohexyl phenyl- ketone, and 2-methyl- 2-hydroxy propiophenone Aromatic sulfonyl chlorides such as substituted alpha ketol, aromatic sulfonyl chlorides such as 2-naphthalenesulfonyl chloride, and the like, 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime Photoactive oximes;

These polymerization initiators are used in an amount of 0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight with respect to 100 parts by weight of the (meth) acrylic acid ester monomer.

Moreover, in this invention, in the said acrylic pressure sensitive adhesive,

(1) blending inorganic or organic fillers,

(2) As inorganic or organic fillers, hollow microspheres are used,

(3) mix bubbles having an average bubble diameter of 50 to 500 µm, or

(4) By containing both of the hollow microspheres and bubbles having an average bubble diameter of 50 to 500 µm, further improvement in flexibility and stress relaxation characteristics of the protective sheet 2 or the pressure-sensitive adhesive layer 2b can be realized. In particular, the protection function of civil and structural structures (1), for example, concrete and steel structures, in the protection of sites where vibrations occur constantly or intermittently, such as bridges of railways or roads, and inner walls of tunnels. And durability can be further improved.

Examples of the inorganic fillers include calcium carbonate, silica, alumina, titanium oxide, clay, and the like. As organic fillers, polyethylene, polyester, polystyrene powder, and the like can be used, but any of them is limited thereto. It is not.

The compounding quantity of these inorganic fillers and organic fillers is 0.5-20 weight part with respect to 100 weight part of (meth) acrylic-type (co) polymers, Preferably 5-15 weight part is preferable.

In the present invention, as the inorganic filler or the organic filler, it is preferable to use a material whose shape is a hollow microsphere.

By adding these inorganic fillers, organic fillers or hollow microspheres in the pressure-sensitive adhesive, in addition to the above-mentioned improvement in flexibility and stress relaxation characteristics, the shear adhesive force of the pressure-sensitive adhesive layer can be further improved, and the protective sheet 2 is civilized. It is possible to achieve the effect of improving the adhesion in the case of attaching to the structure and the building structure (1), that is, the vertical part such as a concrete structure.

As the hollow microspheres, inorganic hollow microspheres such as hollow glass balloons, alumina balloons and ceramic balloons having an average particle diameter of 5 to 200 µm, and organic hollow microspheres such as vinylidene chloride balloons and acrylic balloons Can be used. As an average particle diameter of these hollow microspheres, the thing of 5-200 micrometers, Preferably it is 10-100 micrometers can be used. In the present invention, the average particle diameter of the hollow microspheres is a value measured using a particle size distribution system of the laser diffraction method. The density of the hollow microspheres may be 0.1 to 0.8 g / cm 3, and preferably 0.12 to 0.5 cm 3. When the density is less than 0.1 g / cm 3, when blended into the pressure-sensitive adhesive precursor, the rise becomes severe and it is difficult to uniformly disperse. If the density is higher than 0.8 g / cm 3, the weight of the protective sheet 2 increases, which causes a problem in workability.

The amount of the hollow microspheres to be used is preferably 10 to 50% by volume, preferably 15 to 40% by volume of the pressure-sensitive adhesive layer. If the amount used is less than 10% by volume, the added effect cannot be obtained. If the amount is more than 50% by volume, the adhesive force is lowered.

Moreover, the bubble of an average bubble diameter is 50-500 micrometers, Preferably it is 100-350 micrometers, can be mixed with the adhesive layer 2b as a pressure-sensitive adhesive of this invention, and a level | step difference absorptivity and heat insulation can also be improved. By mixing bubbles in the pressure-sensitive adhesive (adhesive layer), the pressure-sensitive adhesive layer 2b as a pressure-sensitive adhesive has better flexibility and stress relaxation property, and vibrations are generated continuously or intermittently, especially in bridges on roads or railways. For civil engineering structures and building structures (1), they are quite effective.

In addition, the average diameter of a bubble can be measured by an X-ray CT apparatus. That is, first, the sample of the protective sheet 2 to be measured is set to an X-ray CT apparatus, for example, NX-HCP-OT160-1L manufactured by Nitetsu Ellex Co., to take a tomographic image. At that time, a plurality of layers of at least 100 layers are measured every few μm. The measurement of the bubble diameter assumes the maximum value when focusing on individual bubbles and observing a plurality of layers as the bubble diameter of the bubble, and estimates the average bubble diameter of the sample of the protective sheet 2 from the average value of the bubble sizes. It was.

As a method of mixing bubbles with the pressure-sensitive adhesive, an inert gas such as nitrogen gas, carbon dioxide gas or argon gas is introduced into the acrylic pressure-sensitive adhesive, or the bubbles are mixed by a shearing method, for example, a microblender or a homomixer. The bubbling method of nitrogen, carbon dioxide gas, etc. can be used. Moreover, in order to introduce a bubble finely and stably into a pressure-sensitive adhesive agent, you may add an appropriate surfactant as needed. In order to introduce a bubble more finely and stably, it is more preferable to use a fluorine-type surfactant. The acrylic pressure-sensitive adhesive in which the bubbles are mixed is cured by a method such as thermal polymerization or UV polymerization, and bubbles are dispersed in the final pressure-sensitive adhesive layer 2b.

In addition, the pressure-sensitive adhesive of the present invention, in addition to the above components, depending on the type of pressure-sensitive adhesive, a crosslinking agent, for example, polyisocyanate crosslinking agent, silicone crosslinking agent, epoxy crosslinking agent, alkyl etherified melamine crosslinking agent and the like For example, solid, semi-solid or liquid, plasticizers, fillers, antioxidants, antioxidants or colorants made of pigments or dyes at room temperature, such as rosin derivative resin, polyterpene resin, petroleum resin, oil-soluble phenol resin, etc. A suitable additive may be included.

The thickness of the pressure-sensitive adhesive layer 2b used in the present invention is not particularly limited depending on the purpose of use, but is preferably 0.05 to 5.0 mm, preferably 0.2 to 2.0 mm, more preferably 0.3 to 1.2 mm, and 0.05. If it is less than mm, sufficient adhesion characteristics cannot be obtained with respect to a to-be-adhered body, and the unevenness | corrugation of the to-be-adhered body surface cannot fully be absorbed, and the possibility of floating in an adhesion part becomes high. If the thickness exceeds 5.0 mm, the cost of the tape becomes expensive, the practicality is insufficient, the weight of the tape increases, and workability is also caused.

In addition, when foam | bubble is introduce | transduced into a pressure-sensitive adhesive agent, it is preferable that the thickness of the final adhesive layer 2b shall be thickness at least 1.5 times or more of average bubble diameter.

The protective sheet 2 of the present invention may be constituted only of the pressure-sensitive adhesive layer 2b composed of the aforementioned various pressure-sensitive adhesives. In this case, considering the workability in the field, it can be made into a wound body wound in a roll shape in a state in which a release film (separator) is laminated on the pressure-sensitive adhesive layer 2b. In this case, as a separator, a paper or a plastic film base material can be used, and what apply | coated the silicone mold release agent to the surface, for example, one side or both surfaces can be used as needed.

As shown in FIG. 2, the protective sheet 2 of this invention can be set as the structure which has the said adhesive layer 2b in the one surface of the weather-resistant film 2a. By providing the weather resistant film 2a, the weather resistance and long-term reliability of the protective sheet 2 can be improved further.

In the present invention, as the weather resistant film 2a, the protective sheet 2 is deteriorated in a short period of time, for example, after being attached to a concrete and steel structure, that is, a civil structure and a building structure 1, for example, less than one month. If it is not the same material, the material etc. are not specifically limited, For example, anti-aging agent, a ultraviolet absorber, chemically inert pigment, etc. to various plastic materials, such as a polyolefin type, polyvinyl chloride type, polyester type, or an acryl urethane type, etc. And film-formed, sheet-formed, film-sheet-shaped metal materials such as various metal foils and metal plates, lamination bases of plastic films and metal foils, films or fiber bases metal-deposited on plastic films, and the like can be used. .

In particular, as the weather resistant film 2a, various fluorine resin films are more preferable. Although it does not specifically limit as a fluororesin film, For example, polyvinyl fluoride, polytetrafluoroethylene, a perfluoroalkoxy alkane, an ethylene tetrafluoroethylene copolymer, etc. are used more preferably.

In addition, the thickness of the weather resistant film 2a is not specifically limited, For example, the film of 5-500 micrometers in thickness, Preferably it is 10-200 micrometers, More preferably, the film of 20-60 micrometers is used.

Next, a protective sheet for a concrete structure in a civil engineering structure and a building structure, a protective method using the protective sheet, and the like will be described based on FIGS. 3 (a), (b) to 5 (a) and (b). .

(1) The civil and structural structures (1), that is, the surface of the concrete is washed with water, a brush, a disk sander, a blast treatment, etc. to remove dirt and deposits. In the case where the coating is applied, it is a rule to remove the deteriorated layer such as an overcoat, but it may not be removed as long as the interlaminar force above the adhesive force of the protective sheet 2 can be confirmed.

(2) The primer is uniformly applied to the surface of the concrete by bristles, roller brushes, air spray, airless spray or the like.

(3) The protective sheet 2 is attached to the surface of the primer 2c within the usable time of the primer 2c in FIG. 3 (a).

(4) In the attaching operation, a roller, a defoaming roller, or the like (not shown) is used between the primer 2c and the protective sheet 2 to prevent air from entering the center of the protective sheet 2. Attach while pulling towards the end.

(5) If air enters, deflate the air with a fine needle such as a needle.

On the other hand, when the unevenness of the concrete surface as the civil engineering structure and the building structure 1 is difficult to follow the protective sheet 2 remarkably, the putty treatment can be performed as shown in FIG.

In addition, the method of protecting (repairing) the concrete structure as the civil structure and the building structure 1, in which a crack has already occurred, will be described below.

(1) The base treatment is performed around the cracked portion of the concrete surface, that is, about 5 cm on both sides from the crack with a brush, a disk sander, or the like.

(2) A primer 2c is applied.

(3) The protective sheet 2 is attached to the base-treated part.

(4) In the attaching operation, the protective sheet 2 is pulled out closely so that air does not enter between the primer 2c and the protective sheet 2 by using a roller, a defoaming roller (not shown), or the like. Attach it.

In addition, the method of protecting (repairing) the concrete structure as the civil structure and the building structure 1 in which the through crack has already occurred will be described below.

(1) According to the cracks, a thin sealant with putty material (2d) or tape is attached to the injection pipe at the same time, and the epoxy resin injection material is injected into the crack from the pipe after curing the putty material (2d).

(2) The pipe is removed.

(3) The protective sheet 2 is attached to the surface of the primer 2c within the usable time of the primer 2c.

(4) In the attaching operation, a roller, a defoaming roller (not shown), or the like is used between the primer 2c and the protective sheet 2 to prevent air from entering the center of the protective sheet 2. Attach while pulling towards the end.

(5) If air enters, deflate the air with a fine needle such as a needle.

On the other hand, when the unevenness of the concrete surface is remarkably difficult to follow with the protective sheet 2, the putty treatment can be performed after the primer 2c is applied.

Next, each Example of the protective sheet 2 applied to the protective sheet of the concrete structure in the civil engineering structure and building structure which concerns on this invention, and the protection method using the said protective sheet is demonstrated.

Example 1

First, a pressure sensitive adhesive is produced. Thus, as a monomer (monomer), 0.05 part by weight of the trade name monocure 651 (made by Tever Specialty Chemical) as a photopolymerization initiator, 90 parts by weight of 2-ethylhexyl acrylate and 10 parts by weight of acrylic acid, and the name of the product cure (184) Tiber specialty chemicals) 0.05 weight part was mix | blended, and the ultraviolet-ray was irradiated under nitrogen atmosphere and the partially polymerized syrup was obtained.

0.2 part of fluorine-based surfactant is added in solid content with respect to 100 parts by weight of the produced syrup, and it is made into hollow glass beads (hollow microspheres), brand name Cellstar Z-27 (manufactured by Tokai Kogyo Co., Ltd., real density: 0.27 average Particle diameter: 63 μm} was added 10 parts by weight (about 27% by volume) based on 100 parts by weight of the syrup.

Subsequently, the pressure-sensitive adhesive was applied to the PET substrate (separator) subjected to the peeling treatment so as to have a thickness of 1.0 mm, and the PET substrate subjected to the peeling treatment was pasted thereon. ) Was examined to obtain an adhesive layer having a thickness of 1 mm.

The obtained adhesive layer 2b was made into the protective sheet 2 for the purpose of laminating to the 38-micrometer-thick fluorine-type resin film (Tedla film TGH15BL3 made by DuPont).

Next, various tests shown in Figs. 3 (a) and 7 (b) are performed based on the first embodiment of the protective sheet for the concrete structure in the civil and structural structures according to the present invention. The evaluation was confirmed.

(1) Adhesion strength of the adhesive sheet (2b) applied to the present invention and crack cracking test of concrete as civil engineering structure and building structure (1)

Generally, when the adhesive sheet 2b is directly attached to the concrete as the civil engineering structure and the building structure 1, the adhesion may be lowered due to the alkalinity of the concrete. Therefore, as shown in Fig. 3 (a), an epoxy resin, that is, a primer 2c was applied for the purpose of blocking alkalinity of the concrete, and it was confirmed whether or not the adhesive force was reduced. As shown in Fig. 4 (a), repetition of hot and cold is confirming whether or not the property is maintained even under a load.

As shown in Fig. 4A, the test results show little change even under load. In addition, also in the destructive form, the adhesive sheet 2b or the adhesive is agglomerated and broken, as shown to FIG. 4 (a), and adhesion with concrete is not broken. The property which originally requires is a matter of following a crack etc. completely, and it is good if there is no cracking or peeling as a coating film.

Next, a crack followability test was performed. This pulls up and down the test piece which produced the crack as the adhesive sheet 2b, and confirms to what extent it conforms to a crack. In addition, the crack followability is confirmed even after the load of cold and hot repetition is applied.

As shown in Fig. 4 (b), the test result shows that the displacement extends 10 mm or more at 20 ° C., and the material substantially follows the crack. In addition, even in a low temperature environment of -20 ° C, the displacement extends by 6 mm or more, and it has been found that the material follows the crack even in a low temperature environment.

(2) About the concrete crack followability test as the adhesive sheet (2b) and the civil and structural structures (1) on which the weather-resistant fluorine film (2a) applied to the present invention

As the first crack followability test, this test is performed by attaching the weather-resistant fluorine film 2a because it is required to be weather-resistant or the like, in actual construction, without sticking only to the civil engineering structure and the building structure 1 with the adhesive sheet 2b. The same test as in (1) was performed. The test was similarly carried out after alkali resistance and cold and cold repeated.

According to the test result, as shown in FIG. 6, it confirmed that it was excellent in crack trackability like the adhesive sheet 2b demonstrated in above-mentioned (1). In addition, it was confirmed that the use of the flexible weather-resistant fluorine film (2a) is more excellent in crack tracking properties.

After repeating 2000 times of fatigue (3 Hz) of ± 0.5 mm from the 1.5 mm tensile state as the second crack followability test, a test was performed to confirm crack followability by visually checking whether the coating film was torn. As a result, as shown in FIG. 7, even at -10 degreeC, the adhesive sheet 2 confirmed that it was excellent in crack tracking property, without breaking | breaking. Even when a load is applied, the pressure sensitive adhesive sheet 2b is not broken and the deterioration of the pressure sensitive adhesive sheet 2b can be prevented by integrating the epoxy resin {primer 2c} and the weather resistant film 2a with the pressure sensitive adhesive sheet 2b. We confirmed that there was.

[Example 2]

In the same manner as in Example 1, a pressure-sensitive adhesive composition containing a syrup, a fluorine-based surfactant, and hollow glass beads was prepared, and the pressure-sensitive adhesive composition was placed in a beaker, bubbling nitrogen gas from the bottom, and interlocking the bubbles. Bubbles were mixed by a homomixer so as to obtain a bubble-mixing pressure-sensitive adhesive. Next, the protective sheet 2 was obtained from the bubble mixing pressure-sensitive adhesive obtained by the above method in the same manner as in Example 1.

At this time, the bubble of the sample of the protective sheet 2 was 197 micrometers of average bubble diameters, 389 micrometers of largest bubble diameters, and 70 micrometers of standard deviations. At this time, the X-ray CT apparatus used for the measurement was NX-HCP-OT160-1L manufactured by Nitetsu Ellex Co., Ltd., and the protective sheet 2 sampled at about 1 mm angle was observed at 105 layers of monolayers every 3.4 µm, and 31 The bubble diameter of each bubble was calculated | required and the average bubble diameter was computed.

As a result of the evaluation, crack tracking, step absorbency, and thermal insulation similar to those of Example 1 were obtained.

Example 3

Except not adding hollow glass beads, it was set as the desired protective sheet according to Example 1 above. As a result of evaluation, crack tracking property, step absorbency, and heat insulation similar to those of Example 1 were obtained.

Example 4

A protective sheet 2 was obtained in the same manner as in Example 1 except that the fluorine resin film was not laminated. That is, the protective sheet 2 of this embodiment is comprised only by the adhesive layer or the adhesive sheet 2b. As the evaluation result, roughly the same as in Example 1, crack followability, step absorbency and heat insulating property can be obtained.

In addition, the detail of the protection method using the protective sheet 2 and the protective sheet 2 which concerns on Example 1 thru | or Example 4 mentioned above is the same as what was described in the term of the best form for implementing above-mentioned invention, The description is omitted.

The protective sheet 2 described in Examples 1 to 4 was constructed on a concrete wall height shelf of the bridge.

Since the surface of the concrete which has undergone the change of time becomes significantly dirty by the exhaust gas caused by the rainfall or the traffic vehicle, the floor is cleaned by high pressure cleaning, and the surface irregularities are smoothed by a disk sander. In addition, the site where the surface of the concrete was missing was restored to the cross section by polymer cement mortar. In the places where rust is generated by reinforcing steel in the concrete, cross-sectional recovery was performed with polymer cement mortar after application of anti-rust material to the rebar exposed by dropping concrete in the surrounding area. The protective sheet 2 of the present invention was attached to the protective sheet 2 of the present invention using a defoamer roller in the order of the top and the outside of the concrete height shelf. In addition, the protective sheets 2 and 2 were stacked together to cover the surface of concrete continuously.

The protective sheet for the concrete structure and the protective method using the protective sheet in the civil and structural structures according to the present invention have the following effects because they have the above-described configuration and function.

In the conventional crack prevention or repair method by the injection method, in particular, in areas where stress is generated continuously or intermittently in bridges, box cuts, and the like on railways and roads, maintenance is maintained over time. The increase in the cost of repair is inevitable, and recurrence such as cracking is inevitable. If the state remains cracked on the painted surface of a concrete structure or steel structure, changes in temperature, anticipation, Due to the stress generated in the structural member due to an alkali aggregate reaction or the like, the crack recurs or expands, and leakage of rainwater or the like from the part of the crack causes corrosion of the steel such as the reinforcing steel or the tension steel, which constitutes the structural member. In addition, concrete is destroyed by freezing and melting of rainwater submerged in the cracked portion, and the durability of the structural member is significantly lowered. In addition, in the case of the concrete structure, although the fall of the concrete piece was attracted, in the protection method using the protection sheet and the protection sheet of the concrete structure in the civil structure and the building structure of the present invention, by using the protection sheet, In addition to excellent elasticity, it is possible to prevent or repair cracks generated in concrete structures in civil structures and building structures even at low temperatures, to prevent leakage of rainwater, etc. The pressure-sensitive adhesive can be applied to the surface of a concrete structure or the like alone by using the adhesiveness as a feeling of a tack, and the protective sheet itself has flexibility, and the adhesive layer has flexibility before and after adhesion of the protective sheet. I can do it and, by the stress relaxation property, There is an effect that it is possible to increase the durability and weather resistance of the member.
In addition, the protection method using the protective sheet of the concrete structure in the civil and building structures of the present invention, by attaching the protective sheet to the exposed surface of the concrete structural member, there is no need to cure, waterproof and protect over time This makes it possible to produce a uniform finish with high quality.

Claims (24)

When repairing a concrete structure in a civil structure and a building structure in which a crack has occurred, a protective sheet having flexibility that is attached after the surface portion of the concrete structure in the civil structure and the building structure is applied and applied after applying a primer. as, The protective sheet is formed of a weatherproof film substrate and a pressure-sensitive adhesive layer formed on one side of the weatherproof film substrate and having flexibility before and after attachment, The pressure-sensitive adhesive layer having flexibility before and after the attachment is a pressure-sensitive adhesive and is composed of a (co) polymer having (meth) acrylic acid alkyl ester as the main monomer, A protective sheet for a concrete structure in a civil engineering structure and a building structure, wherein a hollow microsphere of inorganic or organic filler is added to the pressure-sensitive adhesive layer. The protective sheet for a concrete structure according to claim 1, wherein the weatherproof film base material is a fluororesin film. The civil engineering structure according to claim 1 or 2 within the temporary service time after removal of dirt or deposits on the surface portion of the concrete structure in the cracked civil engineering structure and the building structure, and after applying a predetermined amount of primer. A protective method using a protective sheet for a concrete structure in a civil structure and a building structure, comprising attaching a protective sheet for a concrete structure in a building structure to the surface of the primer. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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