JPH0717779A - Production of thin alc panel - Google Patents

Abstract

PURPOSE:To provide a process for producing a thin ALC panel preventing the weight increasing patterns appearing on the surface of the panel. CONSTITUTION:Both sides of plural reinforcing materials 4 are supported by supporting rod 1 and are arranged at prescribed intervals in a form 3. A mortar slurry is injected into this form 3 and is expanded. The supporting rods 1 are removed while the slurry has a flow property, by which the holes formed after the removal of the supporting rods 1 are made solid by the self-decay property of the mortar slurry and the distances from the flanks of the supporting rods 1 to the cut surfaces of the panel are made larger than the flow distance in the horizontal direction of the mortar after removal of the supporting rods.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin lightweight cellular concrete panel (hereinafter referred to as an ALC panel) having a thickness of 20 to 50 mm.

[0002]

2. Description of the Related Art Conventionally, there is known a method of manufacturing a thin ALC panel having a panel thickness of 20 to 50 mm by using a metal lath or a welded wire net as a reinforcing material. This is because the mortar slurry is injected into the mold, and after the foaming of the mortar slurry is completed, the support rod holding the reinforcing material in the mold is pulled out while the mortar slurry retains fluidity so that the support rod extraction hole is formed. This is a manufacturing method in which the mortar slurry is self-disintegrating and is solid. (Japanese Patent Publication No. 63-43208) According to this manufacturing method, since no extraction hole remains inside the ALC panel, it has practically sufficient strength even if it is a thin plate having a panel thickness of 20 to 50 mm.

[0003]

However, in the above manufacturing method, there is a problem that a striped pattern appears on the surface of the obtained panel along the positions where the supporting rods are present, and the product appearance is poor. Therefore, an object of the invention is to prevent a heavy pattern from appearing on the surface of a thin ALC panel.

[0004]

In view of the above problems, when the behavior of the mortar slurry in the mold in the above manufacturing method was analyzed, the temperature of the mortar slurry injected into the mold increased due to the heat of hydration reaction. However, since the heat is radiated to the outside on the side surface of the mold, a temperature difference is generated between the central portion and the side surface of the mortar slurry of the mold, and the temperature difference causes a difference in saturated vapor pressure in the bubble and gas volume expansion pressure. If the density of the reinforcing material is different between the central part and the side surface of the mortar slurry, the difference in the rising resistance of the mortar slurry causes the mortar slurry to flow from the central part of the mold toward the side surface, and this phenomenon It was found to continue after the support rod was pulled out.

When the support rod is pulled out, the air bubbles around the support rod are caught in the support rod and come out together, and the portion from which the support rod is pulled out has a heavy portion with a large specific gravity that does not contain bubbles. become. Then, due to the flow of the mortar slurry, the heavy portion moves and appears in a striped pattern on the cut surface of the panel, which causes a phenomenon that the appearance of the finished panel deteriorates.

Therefore, in the present invention, when the distance from the side surface of the support rod to the panel cut surface is set to be equal to or longer than the horizontal flow distance of the mortar after the support rod is extracted, the heavy portion does not appear on the surface of the panel and is excellent. They found the finding that it would be a product with an external appearance. That is, the gist of the invention is that a plurality of reinforcing materials are supported by supporting rods on both sides thereof and vertically arranged at a predetermined interval in a mold, and mortar slurry is injected into the mold to foam and maintain fluidity. In the method for manufacturing a thin ALC panel by extracting the support rod between the support rod to make the extraction hole of the support rod solid by the self-disintegrating property of the mortar slurry, the distance from the side surface of the support rod to the panel cut surface is set. It is characterized in that the distance is not less than the horizontal flow distance of the mortar after the support rod is removed.

[0007]

The present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a state in which a reinforcing material is arranged on a mold, and FIG. 2 is a horizontal cross-sectional view showing a panel cut surface in a state where the reinforcing material is arranged. In the figure, a supporting rod fixing frame 2 is provided on a mold 3, and a plurality of supporting rods 1 are arranged on the supporting rod fixing frame 2. The support rod 1 is passed through the support rod fixing frame 2 at its upper portion, for example, and is fixed at that portion, and the support rods 1 are arranged at predetermined intervals in the mold. The support rods 1 are composed of a pair, and the space between them is such that one reinforcing member can be inserted and supported, and the reinforcing member 4 is provided between them.
I support you. As the reinforcing material 4, for example, a metal lath or a welded wire net can be used.

FIG. 3 is an enlarged view of a cross section showing a panel cut surface. In the figure, a reinforcing member 4 is arranged between a pair of support bars 1, and a panel cut surface C corresponding to the panel thickness of this product.
Is indicated by a one-dot diagonal line. The distance D from the side surface of the support rod 1 to the panel cut surface C is set to be longer than the horizontal flow distance of the mortar after the support rod is extracted. In the manufacturing method of the present invention, first, a siliceous raw material, a calcareous raw material, a foaming agent, and water are mainly contained in a mold 3 in which a plurality of reinforcing materials 4 supported by the supporting rods 1 and held at predetermined intervals are set. Inject mortar slurry as a component.

Next, while the mortar slurry foams and retains its fluidity, the support rod 1 is extracted, and the extraction hole of the support rod 1 is filled by the self-disintegrating property of the mortar slurry to be solid. After the mortar slurry has reached a semi-cured state, it is demolded, cut at a panel cutting surface C so as to have a predetermined size, and further autoclaved to obtain a thin ALC panel.

In such a method for manufacturing a thin ALC panel, a heavy pattern can be prevented by setting the distance from both sides of the support rod to the panel cut surface to be equal to or more than the horizontal flow distance of the mortar after the removal of the support rod. Of. Hereinafter, the manufacturing method of the present invention will be specifically described with reference to examples. Example 1 A metal lath having a wire diameter of 1 mm was used as a reinforcing material, and both sides of each reinforcing material were supported vertically by supporting rods.
They were arranged in parallel in the mold at intervals of mm. The supporting rod has a cross section of 6 × 13 mm in order to obtain an appropriate second moment of area,
A 800 mm long prism and a carbon steel material were used. The width of the support rod is 13 mm and the side is parallel to the reinforcement.
It was set so that the distance from the side surface of the support rod to the panel cut surface was 11 mm.

The mortar slurry is 33 parts by weight of Portland cement, 7 parts by weight of quick lime, 42 parts by weight of powdered silica, 18 parts by weight of mortar recovery waste, 0.0 parts of metallic aluminum powder.
A mixture containing 7 parts by weight of water and 73 parts by weight of water as main components was stirred and prepared. This mortar slurry was poured into a mold, and after 30 minutes, the supporting rod was pulled out while the mortar slurry maintained its fluidity, and the withdrawal hole of the supporting rod was made solid by the self-disintegrating property of the mortar slurry. Then, after the mortar slurry reached a semi-cured state, the mold was removed and the piano wire was used for 37.5.
The product was obtained by cutting along the panel cut surface at mm intervals and further subjecting to autoclave curing.

A small piece of plastic was floated on the upper surface of the mortar and the horizontal flow distance of the mortar slurry was measured. As a result, the flow distance of the mortar slurry immediately after pulling out the set rod was 6 mm. In this case, the distance from the side surface of the support rod to the panel cut surface is 11 mm,
The appearance of the product was excellent with no heavy pattern appearing on the surface.

Comparative Example 1 A product was obtained in the same manner as in Example except that the support rod had a cross section of 12 × 13 mm and the distance from the side face of the support rod to the panel cut surface was set to 5 mm. As a result, in this case, the horizontal flow distance of the mortar after removing the support rod is larger than the distance from the side surface of the support rod to the panel cut surface, and a heavier pattern appears on the product surface along the location of the support rod. And the appearance was bad.

Although the support rods having a square shape are used in the above-described embodiments, the shape of the support rods is not limited to the square shape, and an appropriate magnitude of the second moment of area of the support rods can be secured and the side surface of the support rods can be secured. Any shape may be used as long as it can secure the distance from the panel cut surface.

[0015]

As described above, according to the method of the present invention, the distance from the side surface of the support rod to the panel cut surface is set in the horizontal direction of the mortar after the support rod is removed without leaving the support rod extraction hole. Since the flow distance is set to be equal to or longer than the flow distance, it is possible to prevent a heavy pattern from appearing on the panel surface. Since the distance from the side surface of the support rod to the panel cut surface was made equal to or more than the horizontal flow distance of the mortar after the support rod was removed,
It is possible to obtain a thin ALC panel that does not show a heavy pattern on the product surface and has an excellent product appearance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a manufacturing state of the present invention.

FIG. 2 is a cross-sectional view showing a manufacturing state of the present invention.

FIG. 3 is an enlarged cross-sectional view of a support rod portion of the present invention.

[Explanation of symbols]

 1 Support rod 2 Support rod fixed frame 3 Formwork 4 Reinforcement C Panel cut surface D Distance from side of support rod to panel cut surface

Claims (1)

[Claims] 1. A method in which a plurality of reinforcing materials are supported vertically by supporting rods on both sides of the reinforcing material and are vertically arranged in a mold at a predetermined interval, and mortar slurry is injected into the mold to foam and maintain fluidity. In the method for producing a thin ALC panel by extracting the support rod to make the extraction hole of the support rod solid by the self-disintegrating property of the mortar slurry, the distance from the side surface of the support rod to the panel cut surface is supported. A method for producing a thin ALC panel, characterized in that the flow distance in the horizontal direction of the mortar after the rod is removed is equal to or longer than the flow distance.