JP3799034B2 - Renovation method for wall surface of exterior tile of formwork - Google Patents

Description

The present invention relates to a new renewal method of the exterior tile wall which is construction by Katawaku tipping method.

  Formwork attaching method has been widespread since around 1970, and has been widely used as a highly reliable method with little risk of tile peeling. For processing the separator penetration part, there are a perforated tile method, a temporary tile method, and a method using a joint part. The perforated tile method has a problem that cracks occur in the tile, and the temporary tile method has a construction problem of increasing the amount of post-tensioning after the temporary tile is removed.

  On the other hand, the method using the joint portion has been adopted when the joint width dimension is relatively large, such as 10 mm or more. For example, as shown in FIG. 4, the method of using the joint portion is driven into the portion of the separator 2 that penetrates the concrete wall 1 and attaches the tile 3. It was a simple method that only required repairing the part with mortar or the like.

  However, as shown in FIG. 5, since the joint base 4 is a concrete base as shown in FIG. 5, the rusting of the separator 2 (2a) caused by the wraparound of rainwater over the years after the construction of this construction method. ) Causes the surrounding tiles 3a and 3b to be pushed out. As this repair method, after removing the separator tip, a rust prevention treatment is performed, and a new tile is attached with a polymer cement mortar or an epoxy adhesive.

  Currently, the Ministry of Construction's Repair Department Building Construction Supervision Guidelines Chapter 11 Tile Construction Section 2 “Materials” [If the formwork tension material is passed through the joint, the cover thickness of the hardware remaining in the concrete is Use a dedicated one to ensure it. ], And there are restrictions on the method of using the joints. In addition, the construction work supervision guideline 1993 Chapter ll Chapter 2 Tile work section 2 “Ceramic ceramic tile form attachment” is a detailed example of joint separator, using plastic spacers and shaft foot bolts to secure the cover thickness. It is posted. However, prior guidelines did not place restrictions on how to use joints.

Therefore, when repairing and repairing tile walls that have deteriorated phenomena, after performing construction by various existing methods such as resin injection, anchor pinning, tile replacement, etc., it is excellent in maintaining transparency, durability, waterproofness, design etc. A method of applying a coating film having a high performance is known (for example, see Patent Document 1).
Japanese Patent No. 2680227 Japanese Patent Publication No. 3-80231 Japanese Patent Publication No. 5-5988 Japanese Patent No. 2611895 Japanese Patent Laid-Open No. 9-21796 JP 9-317195 A JP 2003-56157 A

The method of Patent Document 1 is effective when the aggregate used is minute and the structure is dense, such as tile joint mortar.
However, the joints of the exterior tiles constructed by the formwork attaching method at that time were still in a concrete base and were exposed to wind and rain over time, so they were washed out and become porous, resulting in excessive water absorption. I'm feeling down. With such a concrete joint, it is difficult to ensure the performance excellent in maintaining transparency, durability, waterproofness, design, etc. with the coating film of Patent Document 1.

Moreover, the outer wall concrete joint surface constructed by the former formwork attaching method at that time is likely to cause rusting of the separator again due to the circulation of rainwater over time only by repairing the periphery of the separator portion. Therefore, in order to prevent rainwater penetration from the concrete joints, it is necessary to take measures to prevent rainwater penetration into the joints.
In addition, a method of covering the entire tile wall surface with a resin layer without repairing the floating tile part (see, for example, Patent Document 2), a special guard pin is fixed with an adhesive, and the tile, the mortar layer and the ground concrete are integrated. When replacing a part of the tile stretched on the wall surface (for example, refer to Patent Document 3), the thermoplastic resin block is mounted in the joint space at the periphery of the tile, A method of filling the joint space by heating and pressing the resin block (see, for example, Patent Document 4), a method of reliably injecting an adhesive to the back of the tile without increasing the injection pressure (see, for example, Patent Document 5), Applicable to deterioration of building structure and finishing, cracking of structure, progress of neutralization, rebar corrosion, repair of surface deterioration, etc., prevention of peeling of finish, new surface finishing layer After applying an organic adhesive to the existing wall in the hybrid outer wall repair method (for example, refer to Patent Document 6) that can simultaneously realize the enhancement of the housing protection performance by the installation, and the wall repair method to tile the existing wall For example, a method of forming a base with an adhesive by curing and attaching a tile onto the base with an organic adhesive (see, for example, Patent Document 7) is known.

  However, in Patent Documents 2, 3, 4, and 7, there is little effect against a large external force such as tile extrusion due to rusting from a separator in a form-attached exterior tile, and the joint portion is also integrally covered with a resin layer. Therefore, the texture changes greatly. Moreover, in patent documents 3, 4, since the water absorption preventive measure is not taken with respect to the joint part, there is a concern about rainwater permeation into the outer wall concrete. Further, in Patent Document 5, an adhesive is injected from a gap formed by cutting a base mortar in contact with the back of the tile from the side surface of the perforated hole into a floating gap on the back of the tile, so that the back of the tile is removed from the perforated hole. A gap (passage) leading to the floating gap is ensured, and in this method, it is not preferable to drill a base mortar on the back of the tile because it may cause a healthy tile to float. Moreover, since the water absorption preventive measure is not taken with respect to the joint part, there is a concern about rainwater permeation into the outer wall concrete. Moreover, in patent document 6, it is not the construction method which repairs the design feeling of a tile as it is. Moreover, in patent document 7, since the malfunction in a field form pre-attached exterior tile is limited to a separator peripheral part tile, it is not necessary to newly use the tile for the whole tile outer wall surface.

The present invention has been made in order to solve such a conventional problem, and its purpose is to form a mold that has a tile piece peeling prevention, a design restoration, and a dirt prevention function on the exterior tile wall surface. The purpose is to provide a method for repairing the exterior tile wall.

In the present invention, in addition to repairing the periphery of the separator, for the purpose of preventing rainwater penetration from the concrete deep joints, the exterior tile joints having a thickness of about 3 mm are filled with the resin-mixed joint material, and the entire outer wall It was decided to perform clear coating with hydrophilicity, low contamination, and high durability.
Here, when a small tile having a tile thickness of about 10 mm is constructed by a formwork attaching method, the joint part is filled with concrete about ½ of the tile thickness. Therefore, when newly filling the joint material on the entire outer wall, the joint thickness is about 3 to 4 mm. In addition, some tiles have a chamfered surface. In such a case, the joint thickness may be 3 mm or less. In addition, low contamination refers to making the paint film less hydrophilic by imparting hydrophilicity to the entire outer wall with clear coating. High durability means gloss retention of the paint film by accelerated weathering test. Means the same level as fluorine paint (15 years or more).

  Therefore, the method of repairing a formwork-attached exterior tile according to the present invention is to remove the exterior tile to be repaired and remove the tip of the separator when repairing the exterior tile wall surface where the exterior tile is pasted in the vicinity of the separator portion by the formwork prioritization method. Then, the anti-rust treatment is applied to the tip, a new tile is pasted and cured with a one-pack type epoxy-modified silicone resin adhesive at the exterior tile removal place, and the water absorption adjusting material is applied to the tile joint and cured. Further, a resin-mixed joint material is applied to the tile joint, cured, the outer wall surface is washed, and a clear paint is applied to the outer wall surface.

  Here, the one-pack type epoxy-modified silicone resin-based adhesive refers to a one-pack reaction type and moisture-curing type adhesive having a modified silicone resin and an epoxy resin as main components and calcium carbonate as a filler. One-pack type epoxy-modified silicone resin adhesive has good adhesion to concrete and mortar, the cured film has rubber-like elasticity, excellent impact resistance, and relieves stress due to base deformation and thermal expansion It is possible.

  Moreover, a water absorption adjusting material means EVA type emulsion resin or acrylic type emulsion resin. The EVA emulsion resin contains 35 to 45% EVA resin solids and is emulsified. The EVA resin is a random copolymer of ethylene and vinyl acetate, and ethylene is a monomer effective for internal plasticization of vinyl acetate and is inexpensive. The minimum film forming temperature is 0 ° C., and no plasticizer is required. The copolymerization of ethylene significantly improves the water resistance and alkali resistance, which are disadvantages of vinyl acetate. The acrylic emulsion resin is an emulsion containing 35 to 45% of an acrylic resin solid content. The acrylic resin uses styrene as a hard monomer and 2-ethylhexyl acrylate or butyl acrylate as a soft monomer, and is called acrylic / styrene.

Here, both the EVA and acrylic water absorption adjusting materials have the following effects.
Because it is familiar with cement, it can be constructed without much influence from the wet and dry conditions of the concrete substrate. Adjusts water absorption to the base of the joint mortar, sufficiently promotes the hydration reaction of cement, and improves the adhesive strength. It is excellent in water resistance and alkali resistance and maintains a stable adhesive force for a long time.

  Further, the clear paint refers to a paint having a colorless and transparent finished coating film having a function of imparting hydrophilicity, low contamination, and high durability to the entire outer wall. The acrylic silicone resin paint has an alkoxysilyl group in an acrylic resin excellent in weather resistance, and forms a stable siloxane bond by crosslinking to exhibit excellent durability. The dealcoholization reaction of the alkoxysilyl group exhibits adhesion due to a strong chemical reaction with inorganic materials.

Here, the clear paint has the following characteristics.
Leveraging the high durability of acrylic silicone resin, it has a much longer service life than conventional urethane paints and has the same level of durability as fluorine paint (15 years or more). LCC reduction effect due to high durability can be expected. A very high hydrophilic layer is formed on the coating film surface immediately after coating, and a low contamination effect can be expected. Compared to conventional products, it has a low contact angle (20 to 25 degrees) that is less likely to get rain stains (conventional products are 55 to 60 degrees).

In addition, the present invention can be applied to a refurbishing method in which a perforated tile and a temporary tile portion are provided with functions of preventing peeling, recovering design properties, and preventing stains, as well as formwork-attached exterior tiles that are concrete bases.
In that case, when repairing the exterior tile wall to which the exterior tile is attached by the formwork attaching method, the exterior tile to be repaired is removed, and the exterior tile is removed with a one-pack type epoxy-modified silicone resin adhesive. Applying water absorption adjusting material to the tile joints, curing, applying resin mixed joint material to the tile joints, curing, cleaning the outer wall surface, and applying clear paint to the outer wall surface It is characterized by that.

  By the way, general-purpose joint materials are made by mixing ordinary Portland cement in an amount of 40 to 45%, fine aggregate such as cinnabar sand in an amount of 50 to 55%, and methylcellulose-based water retention agent in an amount of less than 1% in advance. Yes, kneaded with the amount of water specified by the manufacturer. From the viewpoint of workability (coating property, wiping property, etc.), no resin other than the water retention agent is mixed. Originally, the most important purpose of the joint material is to secure the water-stopping property of the tile joint part, and since the three-sided adhesion between the joint base and the tile edge is not expected, adhesion is not expected much.

  On the other hand, in the present invention, since the joint thickness is as thin as about 3 mm, the purpose is to suppress the dryout of the joint material, and various general joint materials are screened. As a result, the dryout is suppressed. Various experimental studies were performed on the joint material, which was judged as a material, using water cement ratio, mixed resin type, and amount as parameters. In this way, as a measure for water retention, adhesion, and durability enhancement of thin-coated joint materials, a water absorption adjusting material is applied to the surface of the outer wall concrete, and then an EVA resin or an acrylic resin is added to the general joint material as a resin amount (P) / Cement amount (C) = 1 ~ 2% by applying resin-mixed joint material, the optimal solution in terms of both adhesion to thin joint material and wiping of joint material adhered to tile It came to the knowledge that it was.

Therefore, the resin-mixed joint material according to the present invention is obtained by mixing EVA resin or acrylic resin into a general-purpose joint material in a ratio of resin amount (P) / cement amount (C) = 1 to 2%. Features.
Here, when the amount of resin (P) / cement amount (C) is less than 1%, the joint thickness is as thin as about 3 mm, so water retention and adhesion enhancing effect due to mixing of resin cannot be expected, and durability When the amount of resin (P) / cement amount (C) exceeds 2%, the viscosity of the joint material increases by mixing the resin, but when it exceeds 2%, it adheres to the tile when applied. The wipeability of the joint material that has been removed will be significantly deteriorated.

  In addition, the resin-mixed joint material according to the present invention peels off the perforated tile and the temporary tile part as well as the formwork-attached exterior tile whose joint base is a concrete base performed by the method using the joint part for the processing of the separator penetration part. It can also be used for repair methods with prevention, design recovery, and dirt prevention functions, but it can also be used as a method for repairing concrete joints in tiled PC plates. Since the tile-attached PC plate is also a concrete deep joint as in the case of the form-attachment method, the resin-mixed joint material of the present invention can be used as a joint repair method when a problem such as poor finish of the joint occurs.

According to the repair method of the wall surface of the exterior tile of the formwork according to the present invention, it is possible to prevent the peeling of the tile piece by the repair technique in the vicinity of the separator part, the mortar joint filling to the deep joint part of the tile, and the clear painting of the entire outer wall. It is possible to have both recovery and anti-smudge functions.
In addition, according to the method for repairing a wall surface of a formwork-attached exterior tile according to the present invention, even when a perforated tile and a temporary tile are used for the treatment of the separator penetration portion, the tile piece is prevented from peeling off, the design property is restored, and the stain is prevented. It is possible to have both functions.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
(First embodiment)
This embodiment shows an example in which the method of repairing a formwork-attached exterior tile wall according to the present invention is applied to a method using a joint (claim 1).
A method for repairing a formwork-attached exterior tile wall according to the present embodiment will be described with reference to FIGS.

First, as shown to Fig.1 (a), the tile extruded by the rusting of the separator 11 provided in the concrete wall 10 (this is equivalent to tile 3a, 3b of FIG. 5 used for the prior art example). As shown in FIG. 1 (b), the tip 13 of the separator 11 is removed.
Next, as shown in FIGS. 1C and 2, the separator 11 is rust-prevented to form a rust prevention treatment portion 12 a. Zinc rich primer is desirable for the rust prevention paint.

  Next, as shown in FIGS. 1D and 3, after the curing period is over, a one-pack type epoxy-modified silicone resin adhesive (for example, “ME-031” manufactured by Tilement Co., Ltd.) is used at the tile removal location. At 14, the new tile 15 is attached with high accuracy so that the adhesive 14 does not excessively protrude from the tile edge. Here, a two-pack type epoxy-modified silicone resin adhesive (for example, “ME-02” manufactured by Tilement Co., Ltd.) is not used because it is difficult to ensure adhesion with joint mortar.

Next, as shown in FIG. 1 (e), the curing period after pasting varies depending on the season, but takes approximately 1 to 3 days, and the EVA water absorption adjusting material (for example, manufactured by Tilement Co., Ltd.) is applied to the concrete joint bottom 16. A prescribed amount of EVA (ethylene vinyl acetate) type “EV-300”) 17 is applied.
Next, as shown in FIG.1 (f), after setting a curing period to 1 to 24 hours, the resin mixed joint material 18 is applied. Wipe with a soft sponge or the like within 15-60 minutes after painting. Here, since the resin mixed joint material 18 is applied to the entire surface of the outer wall of the tile, it is necessary to wipe off the portion other than the joint portion after application. After curing for 1 to 2 weeks, the entire outer wall is subjected to high-pressure washing to wash away dirt that has adhered over time and resin that has adhered during repair work. Washing here means washing off the resin and the like contained in the resin-mixed joint material 18 adhered to the tile surface during repair work before applying the clear coating.

  Thereafter, as shown in FIG. 3, an acrylic silicone-based clear coating (for example, a super weather-resistant acrylic silicone resin paint “Neosilica # 5000GS Clear” manufactured by Isamu Paint Co., Ltd. is used as the undercoat, Contaminated acrylic silicone paint “Neosilica 21C # 1000 Clear” was used. 19) to give a stain prevention function to the entire outer wall including the joint.

In order to confirm the durability of the resin-mixed joint material 18 applied to the concrete base with a thickness of 3 mm, a freeze-thaw test specified by JIS A 1148 and a temperature-cooling repeated test specified by the Japan Society for Architectural Finishing, etc. were performed. . The former was carried out for 200 cycles and the latter was carried out for 300 cycles, and both freeze-thaw resistance and hot / cold resistance were high.
In addition, although the case where it applied to the method of using a joint part was demonstrated in the said embodiment, for example, it is good also as a repair method of the tile wall surface when a perforated tile and a temporary tile part peel and are damaged (Claim 2). ).

(Second embodiment)
This embodiment shows an example of the resin-mixed joint material according to the present invention (Claim 3).
In-house curing (room temperature of about 20 ° C, humidity of 40%) on-site con plate (Fc = 24 N / mm ² , 300 x 300 x 65, material age of about 120 days), various emulsion resins (EVA and acrylic ternary) Copolymer, acrylic latex) is applied as a water absorption adjusting material, and a joint material (for example, “CG-5121” manufactured by Tilement Co., Ltd.) to which various emulsion resins are added is applied as a test body, and a durability test ( Freezing and thawing test and hot and cold repeated test). The water-cement ratio of the joint material was set to two types of the manufacturer specified value -5% (50%) in consideration of the manufacturer specified value and workability.

  On the other hand, a resin-mixed joint mortar prepared by kneading an EVA water absorption adjusting material in a ratio of resin amount (P) / cement amount (C) = 1 to 2%, and durability applied to a concrete base with a thickness of 3 mm is applied. In order to confirm the above, a freeze / thaw test defined by JIS A 1148 and a hot / cold repeated test defined by the Japan Society for Architectural Finishing, etc. were carried out for 200 cycles in the former and 300 cycles in the latter.

Both freeze-thaw resistance and hot / cold resistance were high. Here, a high result means a state in which the adhesion strength after the completion of the test is 1.0 N / mm ² or more, and there is no significant cracking or peeling. 0 cycle time in freeze-thaw test: 1.1N / mm ^2, 200 cycles when: 2.7N / mm ^2, 0 cycle time in hot and cold cycle test: 0.8N / mm ^2, 300 cycles when: 1.8 N / It was mm ^2.

  In addition, the same result was obtained also in the resin mixing joint mortar which knead | mixed the acrylic water absorption adjusting material in the ratio of resin amount (P) / cement amount (C) = 1 to 2%.

It is a figure which shows the process of the repair method of the formwork attachment exterior tile wall surface by 1st embodiment of this invention. It is sectional drawing which shows the state which gave the antirust process to the front-end | tip of a separator. It is sectional drawing which shows the state which gave the clear coating after apply | coating the resin mixed joint material. It is sectional drawing which shows the formwork attachment exterior tile which employ | adopted the method of letting a joint part pass to the process of a separator penetration part. It is sectional drawing which shows the malfunction example of the formwork attachment exterior tile which employ | adopted the method of letting a joint part pass to the process of a separator penetration part.

Explanation of symbols

10 Concrete Wall 11 Separator 12 Tip 13 of Separator 11 Tile 14 One-Part Epoxy-Modified Silicone Resin Adhesive 15 New Tile 16 Exterior Wall Concrete Joint Base 17 Water Absorption Control Material 18 Resin-Containing Joint Material 19 Acrylic Silicone Clear Coating

Claims (3)

When refurbishing the exterior tile wall with the exterior tile pasted to the vicinity of the separator by the formwork method,
The exterior tile to be repaired is removed, the tip of the separator is removed, the tip of the separator is subjected to rust prevention treatment, and a new tile is attached to the location where the exterior tile is removed with a one-pack type epoxy-modified silicone resin adhesive. Applying water absorption adjusting material to the tile joint, curing, applying resin mixed joint material to the tile joint, curing, cleaning the outer wall, and applying clear paint to the outer wall Renovation method for the wall surface of the exterior tile of the formwork. When refurbishing the exterior tile wall with the exterior tile pasted by the formwork method,
Remove the exterior tile to be repaired, paste a new tile with a one-pack type epoxy-modified silicone resin adhesive at the exterior tile removal location, cure, apply a water absorption adjusting material to the tile joint, and cure, Further, a method for repairing an exterior tile wall surface with a formwork, characterized by applying a resin-mixed joint material to the tile joint, curing, cleaning the outer wall surface, and applying a clear paint to the outer wall surface. 3. The method of repairing a formwork-attached exterior tile wall according to claim 1 or claim 2, wherein the resin-mixed joint material includes an EVA resin or an acrylic resin as a general-purpose joint material, and a resin amount (P) / cement amount (C ) = 1 to 2% of the mixture, and a method for repairing the wall surface of the exterior tile of the formwork .

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