JPH07285116A - Manufacture of patterned lightweight cellular concrete panel - Google Patents

Abstract

PURPOSE:To provide a manufacture to obtain a patterned lightweight cellular concrete panel wherein the surface of the panel is free from irregular holes by destruction of cells and an uneven pattern is formed clearly. CONSTITUTION:After placing lightweight cellular concrete slurry 11 on a sheet by laying a flexible sheet in a concrete shuttering 10 into which a necessary number of air blowing holes 13 are formed by penetrating the bottom, pressurized air 15 is blown against the sheet in the concrete shuttering through an air blowing hole prior to generation of shape retaining hardness of the slurry and the slurry is pressed and deformed partly through the sheet, through which an uneven pattern is formed on the surface of the concrete.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for manufacturing a lightweight cellular concrete panel with a pattern.

[0002]

2. Description of the Related Art In recent years, patterned lightweight cellular concrete panels have been used as wall panels for prefabricated unit houses. Such a lightweight cellular concrete panel with a pattern, a pattern sheet coated with a release agent on the surface is laid in a molding frame, and a lightweight cellular concrete slurry is cast on the pattern sheet in the frame, It is produced by curing and curing and transferring the pattern of the sheet to concrete.

However, according to this method, when the lightweight cellular concrete slurry is placed in the mold,
When bubbles in the slurry come into contact with the pattern sheet, the film of the bubbles may be broken due to the weight of the lightweight cellular concrete slurry. Therefore, there is a problem that a large number of fine holes are irregularly generated due to the disappearance of the bubble film on the surface of the panel formed by the concrete slurry in which the bubbles are destroyed. This hole is
Not only the appearance of the panel is poor, but also the panel may be chipped near the hole. further,
If the panel surface is subjected to waterproof coating, it may hinder the uniform application of such coating.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problems, and is a lightweight cellular concrete with a pattern in which there are no pores due to the breakage of bubbles and a concavo-convex pattern is clearly formed. It is intended to provide a manufacturing method for obtaining a panel.

[0005]

That is, the present invention is
After laying a flexible sheet in a formwork in which a required number of air-blowing holes are formed through the bottom surface and placing a lightweight cellular concrete slurry on the sheet, the air is formed before the shape retention hardness of the slurry is generated. A lightweight cellular concrete panel with a pattern, characterized in that an uneven pattern is formed on the concrete surface by blowing pressurized air to the sheet in the form from the blowing hole and partially pressing and deforming the slurry through the sheet. Related to the manufacturing method of.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an example of a method for producing a lightweight cellular concrete panel with a pattern according to the present invention, which is a cross-sectional view showing a step of laying a sheet in a mold, and FIG. 2 shows a lightweight cellular concrete slurry cast on the sheet. FIG. 3 is a cross-sectional view showing the step of setting up, FIG. 3 is a cross-sectional view showing the step of blowing pressurized air onto the lightweight cellular concrete slurry, and FIG. 4 is a cross-sectional view showing the step of demolding the concrete panel from the mold.

The manufacturing method of the present invention comprises the steps of placing a lightweight cellular concrete slurry in a mold and blowing compressed air onto the lightweight cellular concrete slurry.

First, the concrete slurry placing step will be described. As shown in FIG. 1, a flexible sheet 12 is laid in advance in a mold 10 formed in a predetermined panel shape by a plate material or the like. Form 1
On the bottom surface of 0, an air blowing hole 13 for blowing air into the mold 10 is formed. The air blowing hole 13 is for blowing pressurized air from the outside of the mold 10 to the concrete slurry inside through the sheet 12, and the size and depth of the mold 10 and molding are performed. The required number of through-holes are formed depending on the viscosity of the lightweight cellular concrete slurry.

The flexible sheet 12 laid in the mold 10 is freely pressed and deformed by the pressure of the pressurized air so that the surface of the lightweight cellular concrete slurry in contact with the sheet 12 is brought into contact with the sheet 12. Form irregularities. In the present embodiment, the sheet 12 has an overall surface area of about 1-2.
The fine holes 14 of about 0 μm are formed. Due to the fine pores 14, the sheet 12 is impermeable to air and water when not pressed, and exhibits appropriate breathability and water permeability when pressed. Thereby, when pressurized air is blown to the lightweight cellular concrete slurry placed in the mold, excess water and bubbles in the slurry are discharged.

The sheet 12 is made of soft vinyl chloride,
Woven or non-woven fabrics made of synthetic fibers such as polyethylene, polypropylene, vinylon, polyester, nylon, fluororesin and silicone resin, or natural fibers (including paper) coated with a release agent such as oil, wax and silicone Used. The sheet 12 is preferably a polypropylene spunbond nonwoven fabric (trade name “Stratec” manufactured by Idemitsu Petrochemical Co., Ltd.).

After the sheet 12 is laid in the mold 10, the lightweight cellular concrete slurry 11 is cast on the sheet 12 as shown in FIG. The lightweight foamed concrete slurry 11 is preferably a known lightweight foamed concrete slurry prepared by adding water and a foaming liquid to raw materials such as Portland cement, quick lime and silica sand.

Subsequently, as shown in FIG. 3, pressurized air 15 is blown onto the sheet 12 through an air blowing hole 13 formed in the inner bottom surface of the mold 10. The pressurized air 15 is blown before the lightweight cellular concrete slurry 11 in the mold 10 develops its shape retention hardness and partially presses the sheet 12. As a result, the surface of the lightweight cellular concrete slurry 11 in the mold 10 is deformed into the uneven surface shape of the sheet 12 through the sheet 12, thereby forming a desired uneven pattern on the panel surface. In addition, by appropriately changing the pressure and the blowing amount of the pressurized air 15, the deformed shape of the sheet 12 can be appropriately changed, and the uneven pattern formed in the lightweight cellular concrete slurry 11 can be changed.

At this time, since the sheet 12 has proper air permeability and water permeability when being pressed, excess water in the lightweight cellular concrete slurry 11 is pushed out when the pressurized air 15 is blown. Be done. In addition, the pressure of the pressurized air 15 compresses the lightweight cellular concrete slurry 11 in and around the portion in contact with the sheet 12, and the bubbles in the portion are eliminated.

Therefore, in the lightweight cellular concrete slurry 11, a dense surface layer 16 with few bubbles and an inner layer 17 in which the number of bubbles gradually increases from the surface layer 16 toward the inside and becomes coarse are continuously formed. The formed panel having a so-called integral skin is formed.

Since the dense surface layer 16 has few bubbles and is formed relatively harder than other parts, not only the product surface is beautiful and the coating property is excellent, but also the holes due to the destruction of the bubbles and the surrounding holes are formed. It is possible to prevent chipping. Further, the unevenness due to the pressurized air 15 is clearly shown, and a deep pattern can be formed. On the other hand, since air bubbles are present in the inner layer 17 of the panel, various characteristics such as lightness, heat insulating property and soundproof property of the patterned lightweight cellular concrete panel are not impaired.

Next, the mold 10 on which the lightweight cellular concrete slurry 11 has been cast is aged for a predetermined time to cure the slurry 11 and then demolded. As shown in FIG. 4, the sheet 12 is peeled and removed from the obtained panel body, and is further cured by heating and pressurizing with an autoclave (not shown) or the like, and a patterned lightweight cellular concrete panel 18
To get The obtained lightweight cellular concrete panel with a pattern 1
In FIG. 8, the unevenness due to the pressing of the pressurized air is shown as a clear pattern 19.

[0017]

As shown and described above, according to the manufacturing method of the present invention, there are no irregular pores or the like due to the breakage of bubbles on the surface, and a concavo-convex pattern is clearly formed, and the coating property is good. It is possible to obtain a lightweight cellular concrete panel with an attached.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a step of laying a sheet in a mold.

FIG. 2 is a cross-sectional view showing a step of placing a lightweight cellular concrete slurry on the sheet.

FIG. 3 is a cross-sectional view showing a step of blowing pressurized air onto the lightweight cellular concrete slurry.

FIG. 4 is a cross-sectional view showing a step of removing the concrete panel from the mold.

[Explanation of symbols]

 10 Formwork 11 Lightweight Aerated Concrete Slurry 12 Sheet 13 Air-Blowing Hole 14 Micropore 15 Pressurized Air 19 Uneven Pattern

Claims (1)

[Claims] 1. A flexible sheet is laid in a formwork having a required number of air blow holes formed on the bottom surface thereof, and a lightweight cellular concrete slurry is cast on the sheet, and the shape retention hardness of the slurry is adjusted. A pattern characterized by forming a concavo-convex pattern on the concrete surface by blowing pressurized air to the sheet in the mold through the air blowing hole before it occurs and partially pressing and deforming the slurry through the sheet. For manufacturing lightweight cellular concrete panels with panels.