JPH11610A - Painted structure of concrete retaining wall - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To form a painted surface on a concrete retaining wall surface, while preventing the effects of acid rain while securing the moisture permeability of the painted surface, and even if the wall surface cracks, the painted surface The present invention provides a concrete retaining wall coating structure that does not crack. SOLUTION: An undercoating surface 2 is formed on a wall surface 1 of a concrete retaining wall with a moisture-permeable paint containing a silica-based resin, and a joint 4 where the undercoating surface is exposed is left on the undercoating surface 2. An overcoating surface 3 is formed, and the overcoating surface 3 is formed of an acrylic resin-based aggregate-containing moisture-permeable paint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating structure for a concrete retaining wall constructed for earth retaining.

[0002]

2. Description of the Related Art Conventionally, as a painted surface applied to a wall surface of a concrete retaining wall, a synthetic resin-based binder (waterproof type) made of a synthetic resin-based binder in which a paint is applied in a film form, a silica-based resin And those formed of an aggregate-containing multicolor paint obtained by mixing a plurality of moisture-permeable paints of different colors are known.

[0003]

As for the concrete retaining wall, since the back surface is in contact with the soil containing moisture,
Moisture and moisture from the backside impregnate and penetrate the inside of the wall through cracks. The water and moisture are converted to water vapor from the wall and try to be discharged to the outside.
If the painted surface is made of an organic composite paint (waterproof type) having no moisture permeability, moisture and moisture cannot be discharged. For this reason, the painted surface is pushed up from behind by moisture and moisture,
A problem arises in that the painted surface rises to cause peeling of the paint.

[0004] Next, cracks always occur in concrete retaining walls, whether they are constructed on site or precast products. Reinforced concrete retaining walls theoretically allow cracks. In other words, from an academic point of view, it is natural that cracks occur. In such common sense, the biggest problem with coloring and designing concrete surfaces by painting is that they must be painted on the premise of cracking. Cracks before painting and cracks after painting both cause peeling of paint. The solution is important.

When the painted surface is formed of a moisture-permeable paint containing a silica-based resin, moisture and moisture can be discharged through the painted surface, so that peeling of the paint can be eliminated. However, in the moisture-permeable paint containing this silica-based resin, since the silica-based resin is weak to acid rain, a chemical change occurs due to acid rain in a long period of time,
Problems such as fading, discoloration, and deterioration of the painted surface occur.

[0006] Further, when a coating surface having another function (property) is further double-layered on the above-mentioned silica-based resin over the entire surface of the above-mentioned silica-based resin, discoloration or discoloration occurs because there is no influence of acid rain. Can be prevented, the number of finished colors can be increased, and the appearance is improved. However, with this double-coated surface, there is a problem that the coating thickness is inevitably increased, and accordingly, the moisture permeability is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In forming a painted surface on a concrete retaining wall, it is assumed that the concrete surface has a crack. Accordingly, an object of the present invention is to provide a concrete retaining wall coating structure capable of preventing the effect of acid rain while ensuring the moisture permeability of the painted surface while preventing the paint from being peeled off, and improving the external appearance.

[0008]

In order to solve the above-mentioned problems, a concrete retaining wall coating structure according to the present invention has an undercoating surface formed by a moisture-permeable paint containing silica-based resin on the wall surface of the concrete retaining wall. Then, a top coat is formed on the undercoat, leaving joints where the undercoat is exposed, and the top coat is made of an acrylic resin-based aggregate-containing moisture-permeable paint.

In this case, in the coating structure for a concrete retaining wall according to the first aspect of the present invention,
There is a mode in which an overcoat surface is formed leaving a portion where the undercoat surface is exposed.

[0010] Further, in the coating structure for a concrete retaining wall according to claim 1 or 2, the top coating surface is:
There is an embodiment in which a plurality of different colors of acrylic resin-based aggregate-containing paint are used.

As described above, in the concrete retaining wall coating structure of the present invention, the undercoat paint surface is exposed on the undercoat paint surface formed by the moisture-permeable paint containing the silica-based resin, and a part thereof is left. Thus, a top-coating surface is formed, and this top-coating surface is formed of an acrylic resin-based aggregate-containing paint.

[0012] Therefore, the moisture and moisture impregnated and permeated into the interior of the wall from the back side of the concrete retaining wall are discharged outside through the undercoating surface and the overcoating surface. in this case,
Since the coating thickness of the top-coated surface becomes thicker, its moisture permeability will be reduced. Can be secured. Therefore, it is possible to prevent the peeling of the paint due to the moisture on the paint surface.

[0013] Further, since the overcoating surface is formed on the undercoating surface, peeling of the coating surface due to cracks is eliminated. This will be described in detail. First, the silica-based resin-containing moisture-permeable paint used for the undercoating surface has excellent adhesion to the concrete surface. Further, the present invention is characterized in that the adhesive structure is not planar but dot-like. Point-adhesive painting. The acrylic resin used for the top coat has very good adhesion to the undercoat. In addition, there is elongation of the resin, and there is followability to the base. Therefore, even if cracks occur after painting, moisture and moisture from the cracks are discharged to the outside through the moisture-permeable coating film. Even if the crack width is larger than expected, cracks occur only in the undercoating surface, and no cracks occur in the overcoating surface due to the elongation properties of the resin. Furthermore, since the undercoating surface is point-adhesive, there is a feature that swelling and peeling of the coating film do not expand. As described above, it is possible to apply a coating that does not cause cracking on the wall surface of the retaining wall, which is commonly used for cracking, by making full use of the two different resin properties that are moisture-permeable.

In addition, since the top-coating surface appearing on the exterior is not affected by acid rain because of acrylic resin, it is possible to prevent fading, discoloration, and deterioration of the coating film. The appearance of the lizard stone is also improved, and the appearance is improved.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cutaway front view showing a concrete retaining wall coating structure according to a first embodiment. In the first embodiment, the wall surface of the concrete retaining wall constructed by cast-in-place is targeted for painting.

In FIG. 1, reference numeral 1 denotes a wall surface of a concrete retaining wall, and an undercoating surface 2 and a topcoating surface 3
Joints 4 are formed.

The undercoating surface 2 (shown by oblique lines in the drawing) is formed of a moisture-permeable paint containing a silica-based resin. The coating at this time is preferably spray coating. By forming the undercoating surface 2, dirt and scratches generated on the wall surface 1 can be hidden. There is no particular limitation on the color of the paint, but a dark color with low lightness such as black or gray is preferable since it appears later as joints 4 in appearance.

Examples of the moisture-permeable paint containing the silica-based resin include, for example, collage (trade name, manufactured by Higashiya Ube Concrete Co., Ltd., moisture permeability JIS test method Z0208).
650 ml / square meter / day), and a dice coat (trade name, manufactured by Dainichi Seika) can be used. Point adhesive paint. Examples of the acrylic resin-based aggregate-containing coating material include, for example, Couvertou (trade name, manufactured by Higashiya Ube Concrete Co., Ltd., moisture permeability JIS test method Z0208).
230 ml or more / square meter / day), a trade name loan coat (manufactured by Dainichi Seika Co., Ltd.), or the like can be used. The moisture permeability may be 400 ml or 600 ml. Silica sand and emery sand are suitable for aggregate.

The joints 4 are formed by forming the overcoating surface 3 while leaving the undercoating surface 2 such that the undercoating surface 2 is exposed when the overcoating surface 3 is formed. In this case, in the present embodiment, first, the undercoating surface 2 is entirely coated on the wall surface 1. Next, a masking tape is applied thereon so as to form a block pattern, a top coat 3 is formed from above the masking tape, and after the top coat 3 is dried, the masking tape is peeled off. The undercoating surface 2 appears at the mark where the masking tape is peeled off, and this is formed as a joint 4. In addition to the masking tape, a masking material shaped in advance with joints may be attached. For example, a masking material such as a brick pattern or an interlocking pattern may be used.

The top-coating surface 3 (indicated by a dotted pattern in the drawing) is painted with an acrylic-based moisture-permeable paint in acrylic brown. The inclusion of the aggregate is for increasing the moisture permeability of the painted surface 3 and for expressing a rough feeling (small irregularities). Silica is used as aggregate. In this case, the top-coating surface 3 overlaps with the coating surface 2 and has low moisture permeability. However, as for the joints 4, since the undercoating surface 2 is exposed as it is, sufficient moisture permeability is achieved through the joints 4. Can be secured. In addition, since the design can be drawn with the joints 4, the appearance in the design can be improved unlike a mere solid painting.

FIG. 2 is a cutaway perspective view showing a coating structure of a precast L-shaped retaining wall block for constructing a concrete retaining wall according to a second embodiment.

In the second embodiment, the L-shaped retaining block 9
Is to be painted. The L-shaped retaining wall block 9 is formed in an L-shape by a bottom plate portion 91 and a rising portion 90, and the front surface of the rising portion 90 becomes a wall surface 1, and the wall surface 1 has an undercoating surface 2 and a topcoating surface 3. , Joints 4 are formed. In this case, except that the joint 4 is formed so as to draw a stone pattern, the coating structure is the same as that of the above-described first embodiment, and the description of the configuration and operation will be omitted.

FIG. 3 is a cutaway front view showing a coating structure of a concrete retaining wall according to a third embodiment. The wall of the retaining wall is to be painted.

In the figure, the undercoating surface 2 (shown by oblique lines in the figure) is formed of a moisture-permeable paint containing a silica-based resin. The top coat surface (3a, 3b, 3c) except for the exposed portion 5 of the undercoat surface 2
Are formed in a wavy shape by a plurality of different colors of acrylic resin-based aggregate-containing paint. 3a is white granite,
3b is colored red-granite, and 3c is colored blue (monochrome).

In the method of applying the aggregate-containing paint having a plurality of different colors, a plurality of poppers are attached to a spray gun, and a plurality of different colors (for example, white, black, and gray) housed in the poppers, respectively. The paint is sprayed simultaneously from independent nozzles. If the paint is only white, it will not be thick, but if it is a three-colored lizard stone pattern, it must be thick. The reason why the coating material containing the aggregate is limited to the top coating surface 3 is to increase the moisture permeability of the coating and to express the feeling of roughness (fine irregularities) of the coating surface 3.

Therefore, the wall surface 1 is formed by the undercoating surface 2 and the overcoating surfaces (3a, 3b, 3c). Although both have moisture permeability, the topcoating surfaces (3a, 3b, 3c) are formed.
c) is thick and has low moisture permeability. However, the exposed portion 5 of the undercoating surface 2 covers the moisture permeability.
Even if the wall surface 1 is cracked and the undercoating surface 2 is torn, the overcoating surfaces (3a, 3b, 3c) can be followed without breaking because the topcoating surfaces (3a, 3b, 3c) are rich in elasticity. In addition, the fact that water does not enter from the crack generation point and does not expand is due to the effect of the adhesive structure of the silica-based resin. The combination of these different types results in a paint structure that is resistant to wall cracks.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to the embodiment. As the retaining wall, in addition to the L-shaped retaining wall block, a large-sized block may be used.

[0028]

As described above, in the coating structure of the present invention, the joint that exposes the undercoating surface to the lowering of the moisture permeability due to the overlapping of the undercoating surface and the overcoating surface is provided. Thus, moisture permeability can be ensured, and the moisture inside the concrete can be discharged from the entire wall surface or from joints or the like. As an effect, peeling of the coating can be prevented.

In addition, the effect of acid rain can be prevented by the top-coating surface, and the appearance can be improved by the finish of micage stone tone. Also,
The effect that the appearance in design can be improved by the joint is obtained.

With respect to the cracks on the wall surface, the combination of the undercoating surface and the topcoating surface does not cause the peeling of the coating film to expand, and if the cracks enter the undercoating surface, they will not reach the topcoating surface if they are slightly cracked. Can provide a painted structure.

[Brief description of the drawings]

FIG. 1 is a cutaway front view showing a concrete retaining wall coating structure according to a first embodiment of the present invention.

FIG. 2 is a cutaway perspective view showing a coating structure of a precast L-shaped retaining wall block for constructing a concrete retaining wall according to a second embodiment of the present invention.

FIG. 3 is a cutaway front view showing a concrete retaining wall coating structure according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 wall surface 2 undercoat surface 3 overcoat surface 4 joint 5 exposed part of undercoat surface 3a overcoat surface 3b overcoat surface 3c overcoat surface

Claims (3)

[Claims] An undercoating surface is formed on a wall surface of a concrete retaining wall with a moisture-permeable paint containing silica-based resin, and an overcoating surface is left on the undercoating surface, leaving joints where the undercoating surface is exposed. A coating structure for a concrete retaining wall, characterized in that the top-coated surface is formed of an acrylic resin-based aggregate-containing moisture-permeable paint. 2. The coating structure for a concrete retaining wall according to claim 1, wherein an overcoating surface is formed on the undercoating surface except for a portion where the undercoating surface is exposed. 3. The concrete retaining wall coating structure according to claim 1, wherein the top coating surface is formed of a plurality of acrylic resin-based aggregate-containing paints of different colors.