JP2000072560A - Lightweight aerated concrete and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lightweight aerated concrete panel having uneven decorative patterns on both sides, heavy parts formed at least to the middle part of the inside of the panel, denseness and beautiful finish free from porosity on the surface by placing the both sides of a semihardened panel between pressing mold parts having an uneven decorative pattern forming face and pressing the mold parts. SOLUTION: A panel in a semihardened state is a lightweight aerated concrete panel having plasticity before autoclave curing. Preferably the hardness of the semihardened panel has 0.6-5.0 kg/cm2 compression strength (strength test measurement method in accordance with JIS A5, 416). A urethane resin, an epoxy resin, steel, stainless steel, aluminum, etc., are preferably used for the pressing mold parts. Preferably a mold-releasing agent is applied to the pressing parts as a means for preventing fragment in demolding. Preferably reinforcing bars are embedded in the panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight cellular concrete panel and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for lightweight cellular concrete panels having excellent design properties. Above all, panels having a decorative pattern on both sides are used for veranda walls and exterior structures, and play an important role in enhancing the design of a building. In general, panels with uneven cosmetic patterns on both sides
Made by casting molding. In this method, a mortar raw material slurry is poured into a mold in which uneven decorative pattern surfaces are arranged on both the bottom side and the top side, and cured and cured.

However, when a panel having a decorative pattern on both sides is molded by this method, bubbles mixed into the mortar raw material slurry during curing are degassed by buoyancy and accumulate on the surface of the decorative pattern arranged on the upper surface side. There is a problem that the panel has a cavity on the upper surface side. In order to solve these problems, Japanese Patent Application Laid-Open No. Hei 10-44120 proposes a molding method using a device capable of fixing a mold in an upright state and an inclined state. This involves pouring an amount of mortar raw material slurry that does not overflow even in a tilted state into a mold with the uneven decorative pattern surface facing the side, tilting the mold so that one side faces downward, and giving forced vibration Then, the mold is tilted with the other side facing downward and the mold is similarly degassed, and then the mortar raw material slurry is replenished in an upright state, cured and cured.

[0004] However, if the amount of the raw material is reduced by increasing the inclination of the mold for efficient degassing by this method, bubbles may be mixed in again by replenishing the mortar raw material slurry after the deaeration. In addition, if a large amount of the initial mortar raw material slurry is supplied, there is a problem that the inclination of the mold must be reduced so as not to overflow, and degassing cannot be performed efficiently. In particular, a lightweight cellular concrete panel that involves firing during curing is not only easy to overflow but also tends to form burrows due to generation of bubbles during curing, and is not suitable for molding by a casting method. In addition, casting requires a set of molds for each panel, which not only increases production cost but also lowers production efficiency.

On the other hand, Japanese Patent Publication No. Hei 3-27368 and Japanese Patent Publication No. Hei 5-34121,
No. 50 and the like propose a method of pressing a decorative pattern with concave and convex patterns on a semi-cured panel as a means for obtaining a lightweight cellular concrete panel having a decorative pattern with concaves and convexes on one side of the panel.

[0006]

SUMMARY OF THE INVENTION The present invention is to provide a lightweight cellular concrete panel which solves the above-mentioned problems. That is, an object of the present invention is to provide a lightweight cellular concrete panel having a dense and beautiful finish without burrows on the panel surface, and a concave and convex decorative pattern on both surfaces, a method for producing the same, and a formwork apparatus for producing the same. That is.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, pressed both sides of a semi-cured panel with a pressing die portion having an uneven decorative pattern forming surface. As a result, the present inventors have found that a lightweight cellular concrete panel having an uneven decorative pattern can achieve the object of the present invention, and have completed the present invention. That is, the present invention
(1) A lightweight cellular concrete panel having a concave and convex decorative pattern on both sides, and a heavy portion being formed from the concave and convex decorative pattern at least halfway through the inside of the panel.
(2) The lightweight air bubbles according to (1), wherein both sides of the semi-cured panel are sandwiched between the concave and convex decorative pattern forming surfaces of the mold and pressed to simultaneously form concave and convex decorative patterns on both surfaces. (3) A method for manufacturing a concrete panel, comprising: a side frame portion for supporting a side surface of a semi-cured panel from the periphery; and a pair of upper and lower pressing mold portions having an uneven decorative pattern forming surface. A) a formwork apparatus for producing lightweight cellular concrete panels according to (1).

Hereinafter, the present invention will be described in detail. In the present invention, a lightweight cellular concrete panel having a concave and convex decorative pattern on both sides is formed by pressing both surfaces of a semi-cured panel before autoclaving with a pressing mold portion having a concave and convex decorative pattern forming surface and pressing. When a semi-cured lightweight cellular concrete panel is pressed with a pressing part, the internal air bubbles are crushed, and a protruding part is formed from the uneven decorative pattern to the middle of the panel, and the panel surface has a dense and beautiful finish without burrows . In addition, in the present invention, not only a single set of formwork devices for forming the concave / convex decorative pattern, but also the concave / convex decorative pattern is simultaneously formed on both sides of the panel, so that productivity can be improved by shortening the production process. Becomes

FIG. 1 shows a typical example of a formwork apparatus for manufacturing a lightweight cellular concrete panel according to the present invention. In the formwork device of the present invention, a side frame portion 6 that supports the side surface of the semi-cured panel 1 from the periphery and a pair of pressing mold portions 5 having an uneven decorative pattern forming surface face the top plate 7 and the bottom plate 8. Are located. Here, the top plate 7 may not only abut the side frame 6 as shown in FIG. 1, but may also enter the space between the side frames 6 similarly to the pressing die 5 having the concave and convex decorative pattern forming surface. The side frame portion 6 is for supporting the semi-cured panel 1 in order to prevent the semi-cured panel 1 from being damaged.
The semi-cured panel 1 is sandwiched and pressed at the same time to form the concave and convex decorative pattern 3 on both sides. Here, the pressing die portion 5 may be integrated with or separated from the top plate 7 and the bottom plate 8.

Also, in the present invention, a lightweight cellular concrete panel having a semi-cured panel 1 and a pair of pressing mold portions 5 having an uneven decorative pattern forming surface pressed thereon to provide the uneven decorative pattern 3 on both surfaces is provided. The heavy portion 2 is formed from the pattern 3 to the middle of the panel. The heavy portion 2 has a higher density than the bubble portion in which the air bubbles are crushed and the density is partially increased, and thus has a reinforcing effect of suppressing a decrease in the strength of the panel. In the lightweight cellular concrete panel of the present invention, it is preferable that the reinforcing bar 4 is buried.

The semi-cured panel in the present invention is a lightweight cellular concrete panel having plasticity before autoclaving. The semi-cured panel may be manufactured by an existing method.For example, a raw material slurry made by mixing gypsum, crushed debris, foaming agent, etc. with silica stone, cement, quick lime, water as a main raw material, in advance, After pouring into a formwork with reinforcing steel bars or wire mesh and curing it to a hardness suitable for cutting, it is removed from the form to form a semi-hardened mortar block, which is used for tensioned piano wires, etc. It is manufactured by cutting with a wire. The length, width, and thickness of the semi-cured panel are not particularly limited, but the hardness has a compressive strength of 0.6 to 5.0 kg / cm ² in a strength test measurement method based on JIS A5416. Are preferred.

The material, shape, size, etc., of the press mold portion in the present invention are not particularly limited as long as the press mold portion has a strength capable of transferring a concave and convex decorative pattern to a semi-cured panel. Rubber, resin, metal or the like can be used. The pressing part which can be more preferably used in the present invention is urethane resin, epoxy resin, steel, stainless steel, aluminum or the like. Further, it is preferable to apply a release agent to the pressing die portion as a means for preventing chipping at the time of demolding after pressing.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the following examples. A lightweight cellular concrete panel having a concave and convex decorative pattern on both sides was obtained by the following procedure. First, 53 parts by weight of silica stone, 7.5 parts by weight of quicklime, 37 parts by weight of cement, 2.5 parts by weight of dry gypsum, 68 parts by weight of water and 0.06 parts by weight of aluminum powder were mixed with 100 parts by weight of these solids. The mortar slurry is poured into an injection mold provided with a reinforcing wire mesh in advance, and the cured semi-cured lightweight cellular mortar block is cut with a tensioned piano wire, and has a length of 2,000 mm and a width of 2,000 mm. A semi-cured panel having a thickness of 610 mm and a thickness of 50 mm was obtained. Next, the semi-cured panel was placed on a urethane resin pressing mold part having a brick pattern arranged on a bottom plate in the formwork apparatus, and a similar pressing mold part was arranged on the panel. The side surface of the semi-cured panel was supported by the side frame portion, and the press die portion and the side frame portion were released from the mold by pressing 10 mm, respectively, and then autoclaved. The mortar hardness at the time of pressing was 1.5 kg / cm ^{2 when} measured by a method based on JIS A5416.

The lightweight cellular concrete panel obtained according to the present embodiment has no cracks, chips or other defects, and has a dense and beautiful finish without burrows on the panel surface, and a concave and convex decorative pattern is clearly transferred on both sides. Was confirmed.

[0015]

The present invention is a completely novel technique as described in detail above, and has the following remarkable effects. 1. By pressing both sides of the semi-cured panel with a pressing die portion having a surface having a concavo-convex pattern, the concavo-convex pattern can be formed at the same time, and a highly value-added panel can be efficiently produced. 2. By pressing the semi-cured panel with a pressing die, bubbles are crushed, and a protruding portion is formed from the concave and convex decorative pattern to a partway inside the panel. Therefore, the panel surface has a dense and beautiful finish without burrows.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a formwork apparatus for manufacturing a lightweight cellular concrete panel of the present invention (a semi-cured panel is also shown).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 semi-cured panel 2 heavy part 3 uneven decorative pattern 4 reinforcing bar 5 press-type part having uneven decorative pattern forming surface 6 side frame part 7 top plate 8 bottom plate

Claims (3)

[Claims] 1. A lightweight cellular concrete panel having a concave and convex decorative pattern on both sides and a heavy portion formed at least halfway through the panel from the concave and convex decorative pattern. 2. The uneven pattern according to claim 1, wherein both sides of the semi-cured panel are pressed between the two surfaces of the mold frame. Manufacturing method of lightweight cellular concrete panels. 3. The device according to claim 1, further comprising a side frame portion for supporting the side surface of the semi-cured panel from the surroundings, and a pair of upper and lower pressing mold portions having an uneven decorative pattern forming surface. Formwork equipment for manufacturing lightweight cellular concrete panels.