JP2000246717A - Concrete form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a molding face side from becoming rusty and at the same time, minimize surface contamination to mitigate an after-treatment by forming a coating layer of a transparent rust-inhibitive coating on the molding face side of a steel-made concrete form body. SOLUTION: A coating layer 2 of a transparent rust-inhibitive coating is formed on the molding face 1A side of a form body 1 of a steel-made concrete form. In this case, a highly heat-resistant lacquer coating is used which is quick- drying and easily applicable as a rust-inhibitive coating and allows wet on wet coat application, contributing to the formation of a hard and durable coat. This lacquer coating is applied a plurality of times to obtain the coating layer 2. In addition, a parting compound such as a dimethyl silicone oil is applied to the surface of the coating layer 2 according to necessity. Thus it is possible to inhibit rust to be generated on the molding face 1A side of the concrete form and at the same time, prevent an extraneous coating on the surface of a manufactured concrete product from becoming conspicuous and further, mitigate an after-treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete form for producing a concrete form, and more particularly, to a concrete form capable of reducing the surface contamination of the obtained concrete form and reducing post-treatment.

[0002]

Conventionally, various concrete products such as foundations such as concrete blocks, building structures, civil engineering structures and the like are generally manufactured by molding them into a predetermined shape using a concrete formwork. There is
As a concrete form of this type, a form made of a steel material has recently been frequently used from the viewpoint of durability.
In this steel-made concrete formwork, a colored anticorrosive paint is applied to the outer surface, but the metal plate is exposed on the inner side, which is the mold surface. And, after concrete molding, if left to stand, rust will be generated on the inner surface of the formwork, and if the concrete is formed as it is, rust will adhere to the surface of the concrete product and it will be necessary to remove it, so it is necessary to remove rust However, there is a problem that the removal of the rust is extremely troublesome and poor in workability because the work is rubbed off with a screver or the like.

[0003] Therefore, it is conceivable to apply the same rust-preventive paint as that applied to the inner surface of the concrete formwork to the outer surface. However, post-processing for removing this is still necessary, and the above-mentioned problem cannot be solved. In addition, during the production of concrete, the mold surface is in a wet state and is exposed to a high temperature of about 50 to 80 ° C. for a long time, so that the rust-preventive paint conventionally used on the outer surface of the concrete form is inferior in durability, There was a problem that it was immediately peeled off and peeled off.

[0004] The present invention has been made in view of these problems, and a concrete molded body that can prevent rust on the mold surface side of a mold, has less surface dirt, and can reduce post-treatment. An object of the present invention is to provide a manufacturable concrete formwork.

[0005]

According to a first aspect of the present invention, there is provided a concrete form having a coating layer made of a transparent rust-proof paint formed on the mold side of a steel concrete form body. Therefore, it is possible to prevent rust from being generated on the mold surface side of the concrete formwork, and even if paint is attached to the surface of the manufactured concrete product, it is not conspicuous, so that post-processing is light.

According to a second aspect of the present invention, in the concrete form, the transparent rust preventive paint has heat resistance. For this reason, since the rust preventive paint can well withstand the heat of about 50 ° C. to 80 ° C. during concrete molding, the rust preventive paint is hardly peeled off and the durability is improved.

[0007] Further, in the concrete form according to the third aspect, in the first or second aspect, the transparent rust preventive paint is an acrylic lacquer. For this reason, a hard coating film is formed quickly, and the workability and durability are improved due to excellent heat resistance.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete formwork of the present invention will be described below in detail.

[0009] The concrete formwork used in the present invention is made of steel material, and is used for concrete products to be manufactured, such as those for construction used for outer walls and foundations of houses and those for civil engineering such as revetment works. The shape and size are not limited. A feature of the present invention is that a coating layer 2 made of a transparent rust-preventive paint is formed on the mold surface 1A side of a mold body 1 of a steel concrete mold as shown in FIG.

As the transparent rust-preventive paint for forming the coating layer 2, any of a water-based paint, a lacquer paint, and a paint paint can be used. Lacquer paint or paint paint is preferred because it is exposed to heat of about 50 to 80 ° C. for a long time during molding of concrete, and lacquer paint is particularly preferred. In the present invention, a lacquer paint is an aromatic hydrocarbon solvent such as a thinner using a synthetic resin as a base material,
It is a paint containing an ester-based solvent, alcohol-based solvent, ketone-based solvent, etc.It can be dried quickly and has good workability, and can be overcoated to form a hard and durable coating. Has advantages. As the lacquer paint as described above, an acrylic lacquer excellent in heat resistance, based on an acrylic polymer in which other molecules are bonded to acrylic acid, an acrylate ester or the like as necessary, is preferable. As this acrylic lacquer, for example, "A8-300 Eight Clear" (trade name) manufactured by Natco Corporation can be used. As the paint as described above, if the paint contains a coloring material, the paint adheres to the surface of the concrete product and requires post-treatment for treating the paint. use.

The concrete formwork of the present invention comprises a formwork body 1.
The above-mentioned paint is applied, preferably applied twice, to the surface of the resin to form a coating layer 2 and, if necessary, a silicone oil such as dimethyl silicone oil or methyl phenyl silicone oil, or a polyethylene wax such as various surfactants. Alternatively, it can be obtained by applying a release agent such as other oils.

Since the concrete form of the present invention as described above has a coating layer 2 made of a transparent rust-preventive paint formed on the mold surface 1A of the steel concrete form main body 1, the concrete form is used. Rust can be prevented from forming on the mold surface side, and even if the rust-preventive paint is peeled off, the paint will not be noticeable even if it adheres to the surface of the obtained concrete product, so that post-processing is light. Further, since the transparent rust-preventive paint has heat resistance, it can well withstand heat of about 50 ° C. to 80 ° C. during concrete molding, so that it is hard to peel off and has improved durability. It has become. Particularly, when the transparent rust-preventive paint is an acrylic-based lacquer, a hard coating film is formed quickly and a workability and durability are improved.
In addition, the coating layer of the acrylic lacquer has a hard and smooth surface, and the resulting concrete product has a good surface smoothness.

Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be made. For example, since it prevents rust on the mold surface side of a concrete formwork, it can be applied to various concrete formworks such as reinforced concrete materials used for building foundations and large concrete products such as seawalls. In addition, acrylic lacquer is preferred as the transparent rust-preventive paint, but other transparent paints of 50 to 50% are preferred.
It is also possible to use a transparent rust preventive paint that can withstand a temperature of 80 ° C. In the present specification, the concrete form made of steel material does not need to be made entirely of steel material, and may be made of another material as long as at least the mold surface is made of steel material.

[0014]

The present invention will be described in more detail with reference to the following specific examples. Preparation Example 1 Preparation of Transparent Acrylic Lacquer Transparent acrylic lacquers prepared by mixing various solvents and a base resin (acrylic polymer) in the ratios shown in Table 1 below were prepared.

The basic physical properties of this acrylic lacquer are as shown in Table 2.

[0016]

[Table 1]

[0017]

[Table 2]

Example 1 Production of concrete formwork This transparent acrylic lacquer was applied to the inner surface (mold side) of a steel formwork body (for building foundation plate), respectively.
The coating layer was formed by drying for 30 minutes to 1 hour to obtain a concrete formwork. When a building base plate was manufactured using this concrete form, the temperature of the form at that time was about 7
It was about 0 ° C. After curing, the mold was opened to obtain a concrete building base plate. The concrete building base plate obtained in this way had a clean surface and little peeling of the coating layer, indicating that this paint could withstand the heat during concrete molding.

Further, when the concrete formwork was left for one month, no rust or the like was found on the mold surface side on which the coating layer was formed, and the same concrete concrete building base plate as the first one could be manufactured. .

[0020]

The concrete form according to the first aspect of the present invention is formed by forming a coating layer made of a transparent rust-preventive paint on the mold side of a concrete form body made of steel. Rust can be prevented from forming on the mold side, and even if paint adheres to the surface of the manufactured concrete product, it does not stand out, so post-processing is light.

According to a second aspect of the present invention, in the concrete form according to the first aspect, the transparent rust-preventive paint has heat resistance. Since it can well withstand heat of about ° C, it is hard to peel off and has improved durability.

Further, in the concrete form according to the third aspect, since the transparent rust-preventive paint is an acrylic-based lacquer according to the first or second aspect, a hard coating film is formed quickly and heat resistance is improved. It has excellent workability and durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a layer structure on a mold surface side of a concrete formwork according to an embodiment of the present invention.

[Explanation of symbols]

 1 Formwork body (steel concrete formwork body) 1A Mold side 2 Coating layer

Claims (3)

[Claims] 1. A concrete formwork, wherein a coating layer made of a transparent rust-proof paint is formed on the mold surface side of a steel concrete formwork body. 2. The concrete formwork according to claim 1, wherein the transparent rust preventive paint has heat resistance. 3. The concrete formwork according to claim 1, wherein the transparent rust preventive paint is an acrylic lacquer.