JPH0610118B2 - Method for manufacturing glazed cement products - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for producing a glazed cement product in the form of a lump or a thick plate.

<Prior Art> A method for producing a glazed cement pipe with high durability on the inner surface is as described in Japanese Patent Publication No. 61-50918, in which a thin cement-made thin pipe is molded to form a thin-walled pipe. A glaze is applied to the inner surface and baked at a temperature of 850 ° C., and the glaze is fused to the inner surface of the thin-walled tube. After that, this thin-walled pipe is fitted around the outer periphery of the thin-walled pipe by inserting a reinforced cage into the cylindrical formwork, and mortar is put between the formwork and the thin-walled pipe to rotate the formwork. The mortar in which the basket is buried is centrifugally molded into a thick-walled tube to obtain a cement-made tube having an inner surface as a glazed surface.

A method of manufacturing a glazed concrete plate having a high surface design is, as disclosed in JP-A-1-103974, a plain concrete substrate having a plurality of grooves formed on the back surface,
The surface of the concrete substrate is glaze 600-900 ℃
Bake at the temperature of, and fuse the glaze to the surface of the concrete substrate. After that, reinforcing bars are arranged in the respective grooves on the back surface of this concrete substrate and filled with mortar to obtain a reinforced concrete plate having a glazed surface.

<Problems to be Solved by the Invention> However, in the above-mentioned method for producing a glazed cement pipe, since the mortar thick-walled pipe is centrifugally formed at the outer peripheral position of the thin-walled pipe, the direction in which the thick-walled pipe separates from the thin-walled pipe The thick-walled tube and the thin-walled tube are not firmly bonded to each other, and the thin-walled tube whose inner surface is the glazed surface is easily damaged. That is, it is impossible to manufacture a glazed cement pipe having high strength. Moreover, it is not possible to manufacture a cement product having a glazed outer surface.

In the above-mentioned method for producing a glazed concrete plate, when the concrete substrate to be fired is made into a thick plate, a difference in the amount of expansion between the surface and the interior occurs during firing, which causes cracking or breakage. Moreover, since a plurality of grooves are formed on the back surface and the thicknesses are uneven, a difference in expansion amount between the thick portion and the thin portion may occur during firing, and cracking or breakage may occur.
That is, it is not possible to manufacture a thick-walled glazed concrete board having high strength.

After all, the conventional manufacturing method cannot obtain a high-strength lump-like or thick-walled plate-like glazed cement product having an outer surface as a glazed surface.

An object of the present invention is to solve the above conventional problems.

<Means for Solving the Problems> The present invention forms a thin box-shaped unreinforced cement product having a hollow portion opened on one side, and the cement product is glazed on the outer surface thereof and fired to obtain the outer surface of the cement product. Fusing a glaze to the cement product, and then filling the mortar or concrete with or without placing a reinforcing bar in the hollow part of the cement product to obtain a solid glazed cement product in the form of a block. It is a manufacturing method for glazed cement products.

Further, the present invention forms a flat thin-walled tubular unreinforced cement product having a hollow portion opened at both end surfaces, and fires the cement product by applying glaze to the outer surface of the cement product and melting the glaze to the outer surface of the cement product. Glazed, and then the hollow part of the cement product is filled with mortar or concrete with or without reinforcing bars to obtain a glazed cement product having a thick plate-like solid shape. It is a method of manufacturing cement products.

<Operation> In the present invention, a glazed cement product in the form of a lump or a thick plate having a glazed surface on the outer surface is obtained.

In addition, since the hollow portion of the cement product is filled with mortar or concrete, unlike the conventional example of manufacturing a glazed cement pipe, a glazed cement product in which the cement product and the embedded mortar or concrete are firmly bonded is obtained.

Further, the cement product to be fired is a thin-walled box shape having a hollow portion opened on one surface or a flat thin-walled tubular shape having a hollow portion opened on both end surfaces, which is different from the conventional example for producing a glazed concrete plate and has a thin wall. Since the groove for burying the reinforcing bar is not necessary and the thickness is uniform, the amount of expansion does not become uneven during firing, and cracking and breakage are less likely to occur.

<Effects of the Invention> In the present invention, a glazed cement product having a glazed surface or a thick plate having a high strength and having an outer surface as a glazed surface can be obtained.

<Example> The manufacturing method of this example is 100 parts by weight of cement, 300 crushed sand of fine aggregate.
1 part by weight of water, 35 parts by weight of water, and 1 part by weight of an admixture are cast into a mortar, and as shown in FIG.
A thin box-shaped unreinforced cement product 1 having an opening on one side is formed, and the cement product 1 is steam-cured at a temperature of 70 ° C. for 3 hours.

The mortar may be concrete containing coarse aggregate. The steam curing may be autoclave curing, air curing or underwater curing.

Next, the cement product 1 is coated with glaze on the two adjacent surfaces 2 on the outer surface thereof, baked at a temperature of 850 ° C. for 1 hour, slowly cooled, and then cured in water for 1 day.

The curing may be steam curing or autoclave curing.

That is, a thin box-shaped unreinforced cement product 1 in which a glaze is fused to two adjacent outer surfaces 2 is manufactured.

After that, as shown in FIG. 2, a plurality of reinforcing bars 4 are arranged in the hollow portion 3 of the cement product 1, and 100 parts by weight of cement,
Mortar 5 is prepared by kneading 300 parts by weight of crushed sand, 35 parts by weight of water, 5 parts by weight of expander and 1 part by weight of admixture.

The embedded mortar 5 may be concrete containing coarse aggregate.

That is, a glazed rebar cement product 1 having a substantially rectangular parallelepiped solid shape in which a glaze is fused to two adjacent surfaces 2 is manufactured.

As shown in FIG. 3, the solid rectangular glazed rebar cement product 1 obtained by the manufacturing method of the present example has a large number of pieces along the step portion of the drainage groove between the sidewalk h and the road s. Are arranged, and the two adjacent surfaces 2 on which the glaze is fused, that is, the decorative surface 2 of the glazed surface are arranged at exposed positions visible to pedestrians and people in the vehicle, and are used as boundary blocks.

A large number of them are arranged around the raised flowerbed, and the decorative surface 2 of the glazed surface is arranged at the exposed position to be used as a curb block.

Glazed rebar cement product 1 obtained by the production method of this example
Has a high strength, and a boundary block, a curb block, or the like using the same is unlikely to be damaged even if an automobile collides.

In the manufacturing method of this example, since the embedded mortar 5 contains the expansive material, the adhesiveness between the cement product 1 and the embedded mortar 5 is good.

In the manufacturing method of the present example, the reinforcing bar 4 is arranged in the hollow portion 3 of the cement product 1, but the reinforcing bar 4 may not be arranged if there is no need for strength.

Further, the decorative surface 2 of the glazed surface is formed on a part of the outer surface of the cement product 2, but it may be formed on the entire outer surface of the cement product.

As shown in FIG. 4, the manufacturing method of another embodiment is such that the hollow portion 13
Mold a flat thin-walled tubular unreinforced cement product 11 with both ends open, apply glaze to the outer surface of the cement product 11 and bake it, then fuse the glaze to the outer surface of the cement product 11 and then cement. The hollow portion 13 of the product 11 is filled with mortar or concrete with or without reinforcing bars to obtain a solid glazed cement product having a thick plate shape.

Other points are the same as in the previous example.

[Brief description of drawings]

FIG. 1 is a perspective view of an intermediate cement product obtained by the manufacturing method of the embodiment of the present invention. FIG. 2 is a perspective view of a glazed rebar cement product as a final product obtained by the manufacturing method of the same example. FIG. 3 is a cross-sectional view showing a usage example of the glazed reinforced cement product. FIG. 4 is a perspective view of an intermediate cement product obtained by the manufacturing method of another embodiment. 1: Cement product, 2: Outer surface, surface 3: Hollow part, 4: Reinforcing bar 5: Filled mortar 11: Cement product, 13: Hollow part

Claims (2)

[Claims] 1. A thin box-shaped unreinforced cement product having a hollow portion opened on one surface, the cement product is glazed on its outer surface and baked, and the glaze is fused to the outer surface of the cement product. A method for producing a glazed cement product, characterized in that a mortar or concrete is packed in the hollow part of the cement product with or without reinforcing bars to obtain a solid glazed cement product in a lump form. 2. A flat, thin-walled, unreinforced cement product having a hollow portion opened at both end faces is molded, the outer surface of the cement product is glazed and baked, and the outer surface of the cement product is fused with the glaze. Then, in the hollow part of the cement product, with or without arranging the reinforcing bar, mortar or concrete is packed to obtain a glazed cement product having a thick plate-like solid shape. Product manufacturing method.