JP3135167B2 - Concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a mold having irregularities.
The present invention relates to a concrete molding form capable of preventing solidified concrete from adhering to a mold form to be formed and improving the surface appearance of the obtained concrete molded body.

[0002]

2. Description of the Related Art A concrete molded product is formed by removing a mold after the concrete poured into the mold has hardened, and a high-viscosity oil such as grease is previously applied to the concrete casting surface of the mold. (Concrete casting side surface, hereinafter referred to as a mold surface), and the lubricating effect and the edge cutting effect are used to make it easy to remove the mold. In particular, in the case of a so-called mold mold, it is difficult to remove the mold compared to the case where another mold is used, so that grease must be applied. This is because the mold form positively forms a design appearance on the surface of the concrete molded body, so that irregularities having an inverted shape to the surface shape of the molded body to be obtained are formed in advance on the concrete casting surface side. This is because the unevenness causes a biting effect between the surface of the solidified concrete molded product and the formwork.

[0003]

However, such fats and oils tend to adhere to the surface of the molded article when the mold is peeled from the concrete molded article at the time of demolding. A coating operation had to be performed. Also,
Fats and oils have high viscosity, so it is difficult not only to apply evenly to the uneven surface, especially when using a mold form, but it is difficult to clean the form and prevent reuse. When the viscosity is lowered to improve the workability, the function as a release agent is lost, so that a difficult coating operation has to be performed every time.

On the other hand, since fats and oils are still attached to the surface of the molded product, the stains are conspicuous and the appearance is poor. In addition, since the adhered oils and fats hinder the coating, when applying the coating to the surface of the molded body, it is necessary to perform a base treatment such as removal.

The present invention solves the above-mentioned problems, and eliminates the need for applying a release agent for each molding, improves the appearance of the surface of the molded body, and eliminates the need for a base treatment in painting or the like. It is an object of the present invention to provide a mold form in which irregularities are formed on the formed mold surface .

[0006]

In order to achieve the above-mentioned object, the present invention provides a water-repellent material such as trisilane or tetrasilane as a release material on a concrete casting side surface of a mold form having irregularities on a mold surface. Lining by applying or spraying silicon hydride having a high water repellency to form a water-repellent release layer made of the release material on the surface on the casting side.

[0007]

The adhesion of concrete is caused by the fact that cement particles are adsorbed on the adherend surface in the presence of water and gelled by a hydration reaction. Therefore, the presence of a hydrophilic group on the mold surface has an affinity for water and promotes this adhesion phenomenon, but the release material of the present invention has a hydrophobic group and has a high
As it has high water repellency, it prevents the mold surface from getting wet with water,
Inhibits adhesive action.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

[0009]

1A and 1B show a mold formwork as a concrete formwork form according to the present invention. In the figure, a mold frame 1 has an irregular surface formed on a mold surface 1a, and a water-repellent release layer 2 is formed on the irregular surface as shown in an enlarged part of FIG. Have been. The release layer 2 has a predetermined thickness in advance by a lining operation such as coating, spray coating, hot melt coating, or pasting a release material having a hydrophobic group.
a.

As a release material for coating or spray coating, there is silicon hydride having a hydrophobic group such as trisilane and tetrasilane. These are generally used such as waterproof spray on, Ri your known Te is a material having a high water repellent material <br/>, strongly adhere to the mold surface 1a by applying to the mold surface 1a of the absolute dry condition Fixed.

As a release material by hot-melt coating or pasting, a thermoplastic resin material having a hydrophobic group such as Teflon (registered trademark), polyethylene, or polypropylene is used. These resin materials in a molten state are spray-painted with a melt gun or the like and solidified by cooling, or a film is pressed against the mold surface 1a, melted along the mold surface by hot-air spraying, and solidified by cooling to be water-repellent. The release layer 2 is formed.

The release layer 2 formed by the above-described method has an affinity for the concrete surface in a completely dry state, and an anchor effect due to the inside of the fine unevenness formed on the mold surface 1a. As a result, the layer is firmly adhered to the mold surface 1a, and the surface thereof has lubricity and becomes a layer that is not wet with water.

Next, a concrete molding method using the mold frame 1 having the above configuration will be described. Basically ,
As is conventional, the mold 1 the concrete on which to place the rebar
If the mold 1 is dismantled and removed from the mold after solidification of the concrete, a concrete molded body having surface irregularities corresponding to the irregular shape of the mold surface 1a is completed.

In the solidification process, as shown in FIG. 1 (a), the cement particles C1 are adsorbed on the mold surface 1a as an adherend in the presence of water and tend to gel, but water is separated from the mold surface 1a. Mold layer 2
Since the surface of the mold is flipped as indicated by the arrow in the figure, only the interface portion in contact with the surface is gelled and solidified, and is cut off from the mold surface 1a. The adhesion phenomenon can be prevented beforehand.

At the time of demolding, if a force is applied in a direction in which the mold surface 1a is separated from the molded body C, the demolding can be performed relatively smoothly even if there are irregularities. At this time, the release layer 2 is as shown in FIG.
As shown in (1), since it remains fixed to the mold surface 1a, the function as a release layer is also maintained, and the number of diversions can be greatly improved.

On the other hand, the surface of the molded article C has no adhesion of the release layer 2 and a dense surface layer C 2 of the cement gel.
Is formed, the surface becomes smooth and even, and the appearance is improved. In addition, when this surface is coated with the paint for concrete, it is possible to perform the coating as it is without any trouble such as groundwork treatment.

It is also possible to form only the surface of the concrete molded body C having the irregularities by the mold form 1 and use another form on the other side.

[0018]

As described in detail in the above embodiments , in the mold according to the present invention in which the mold surface is formed with irregularities , the release material having a hydrophobic group is preventing wetting of the mold surface with water by inhibiting the adhesive action, also coated or spray paint spray painting or hydrogen reduction of silicon in the molten state, the release layer is tightly bonded to the mold surface Therefore, it does not peel off due to the peeling force at the time of release from the mold, and it is not necessary to apply a release agent for each molding, and the workability can be greatly improved. At the same time, the appearance of the surface of the molded body can be improved, and there is an advantage that a base treatment in painting or the like can be omitted.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a concrete mold frame according to the present invention, and FIG. 1 (a) is a partial cross-sectional view when concrete is molded. (B) is a partial cross-sectional view at the time of the same mold release.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold form 1a Mold surface (Concrete casting side surface) 2 Water-repellent release layer C Concrete molded object C1 Cement particle C2 Surface layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-164138 (JP, A) JP-A-3-100060 (JP, A) Fully open 1987-155165 (JP, U) Really open 1986 58298 (JP, U)

Claims (1)

(57) [Claims] 1. A lining by applying or spray-coating a highly water-repellent silicon hydride such as trisilane or tetrasilane as a release material on a concrete casting side surface of a mold form having irregularities on a mold surface. And a water-repellent release layer made of the release material formed on the surface on the casting side.