JP4558385B2 - Method for producing granular cosmetic material-exposed exterior precast concrete board - Google Patents

Description

  The present invention belongs to the technical field of a method of manufacturing an exterior precast concrete board manufactured in advance in a factory as a member that forms part or most of an outer wall of a building, and more specifically, using a glossy granular decorative material The present invention relates to a method for producing a granular decorative material exposed-type exterior precast concrete board that is exposed on the surface of a concrete board and has improved design.

Conventionally, an exterior precast concrete board manufactured in advance in a factory has been used as a member for forming an outer wall or the like of a building. The exterior precast concrete board is manufactured by placing concrete on a formwork bed, and in order to improve the design of the exterior precast concrete board, a granular decorative material is laid and fixed on the formwork bed surface. A method for producing a granular decorative material-exposed exterior precast concrete board by placing concrete thereon has already been disclosed and variously known.
As an example, Patent Document 1 discloses a method for producing an exterior precast concrete board using specially filled clay as a fixing material for fixing a granular decorative material to a formwork bed surface. The specially filled clay is described as a configuration in which bentonite is added as a plasticizer, water glass is added as a setting modifier, and kneaded water is added to a dry fine-grained sand as a base material. The special filled clay is spread on a formwork bed and smoothed smoothly, and cobblestone or iron flat stone as a granular cosmetic material is about half in the layer of the special filled clay (see FIGS. 1 to 4 of Patent Document 1). Insert and lay down and fix. Alternatively, a granular decorative material is laid out on the upper surface of the formwork bed, and specially filled clay is applied or poured between them to fix them. The unevenness of the specially filled clay generated at that time is smoothed out with a bowl. After that, bar arrangement is performed and concrete is placed in the formwork bed. It is described that the mold is removed when the concrete is hardened, but the polishing work is not performed and the adhering special filled clay is only washed with water. It is a configuration that enhances the design by exposing cobblestone or iron flat stone to the concrete surface as much as possible.

  In the method for producing an exterior precast concrete board disclosed in Patent Document 2, an insulating sheet is laid on a formwork bed surface to which a double-sided adhesive tape is attached, an adhesive is applied to the upper surface of the insulating sheet, and a granular makeup is applied thereon. Scatter and fix the gravel as a material, metal pieces, ore, glass or resin. Or it replaces with the said adhesive agent on the upper surface of an insulating sheet, a double-sided adhesive tape is affixed, and a granular cosmetic material is scattered and fixed on it. After that, concrete is placed in the formwork bed, and after the concrete is completely cured, the surface made of concrete and granular decorative material is sharpened to a thickness of about 1 mm and buffed. ing. Similar to Patent Document 1, the design is improved by exposing the granular decorative material to the concrete surface as much as possible.

Japanese Patent No. 2903379 JP 2001-269912 A

The method for producing an exterior precast concrete board disclosed in Patent Document 1 requires preparation of specially filled clay for fixing the granular decorative material to the formwork bed surface, which is cumbersome and costly. In addition, the specially filled clay spread in the formwork bed is leveled smoothly, and the unevenness of the specially filled clay that rises by inserting granular cosmetics is leveled with a broom, which is cumbersome and troublesome. .
Since cobblestone or iron plank as a granular decorative material has no luster, it needs to be exposed as much as possible on the concrete surface to enhance the design. In order to expose the cobblestone or iron flat stone to the concrete surface sufficiently large, it must be inserted deeply into the special filling clay laid on the formwork bed, and when the special filling clay is washed away in the finishing stage, the cobblestone or iron flat stone Is exposed greatly from the concrete surface, but on the other hand, there is a great concern that the concrete will be peeled off due to insufficient restraint and holding power.

Since the method for producing an exterior precast concrete board disclosed in Patent Document 2 grinds concrete and granular decorative material together in a state where the concrete is completely cured, it requires a powerful grinder and hard grinding work. ,It takes time and effort. Grain gravel, metal pieces, glass, ore, or resin as a granular decorative material has a problem with luster, so the design is not enhanced unless it is exposed to the concrete surface as much as possible. However, as explained in Patent Document 1, when the granular decorative material is polished together with concrete, the restriction and holding power of the granular decorative material embedded and restrained in the concrete are lowered, and the granular decorative material is peeled off from the concrete. I am worried.
By the way, when glossy general glass particles are used, the surface becomes scratched and loses gloss when a strong polishing operation is performed. In addition, it is known that the design property is impaired because it becomes clouded by being eroded by the alkali component of concrete.

  Therefore, an object of the present invention is to select and use glossy quartz glass grains as the granular decorative material, and fix this to a spotted state slightly lifted from the formwork bed surface by utilizing the thickness of the amorphous material. By polishing the thickness of the amorphous material that plays the role of polishing allowance when the concrete is still hardened, the polishing operation is facilitated and the quartz glass particles are not damaged unnecessarily. The exposed quartz glass grains reflect the light and shines brightly, so that an excellent appearance can be obtained. Further, most of the quartz glass grains are embedded in the cast concrete sufficiently deeply into the concrete. It is an object of the present invention to provide a method for producing a granular decorative material-exposed-type exterior precast concrete board having a configuration that does not peel off from the inside.

As a means for solving the above-described problems of the prior art, a method for producing a granular decorative material exposed-type exterior precast concrete board according to the invention described in claim 1 is:
In the method for producing a granular decorative material exposed-type exterior precast concrete board, in which the granular decorative material 3 is laid and fixed on the mold bed surface 2 and the concrete 5 is placed in the mold bed 1 and molded.
Viscosity that can be supported with a certain height floating on the bed surface 2 by placing one quartz glass particle as the granular decorative material 3 on the steel formwork bed surface 2 with a cosmetic effect. And a curable amorphous material 4 having adhesive strength, and using the thickness of the amorphous material 4 to fix it in a spotted state slightly lifted from the bed upper surface 2;
After the amorphous material 4 is hardened, the reinforcement 6 is placed on the bed surface 2, the concrete 5 is placed in the formwork bed 1, and the concrete 5 is demolded at a young age, The surface of the molded concrete plate 5 turned upside down is polished and finished to the extent that the thickness of the amorphous material 4 is scraped off.

Invention of Claim 2 in the manufacturing method of the granular cosmetic material exposure type exterior precast concrete board described in Claim 1,
The quartz glass particles as the granular decorative material 3 are crushed particles having a short side length of 20 mm or more and a large particle size. The long side direction of the quartz glass particles 3 stands perpendicular to the formwork bed surface 2. It is characterized by being fixed with a curable amorphous material 4 in the direction.

Invention of Claim 3 in the manufacturing method of the granular cosmetic material exposure type exterior precast concrete board described in Claim 1 or 2,
Curable amorphous material 4, characterized in that it is a modified silicone sealant or an elastic adhesive or clay.

Invention of Claim 4 in the manufacturing method of the granular cosmetic material exposure type exterior precast concrete board described in Claim 1 or 2,
As the granular decorative material 3, limestone aggregate is used together with quartz glass particles.

Invention of Claim 5 in the manufacturing method of the granular cosmetic material exposure type exterior precast concrete board as described in any one of Claims 1-4,
The granular decorative material 3 is characterized in that it is fixed with a curable amorphous material 4 including a spacer 7 which is supported by being floated at a certain height between the granular decorative material 3.

According to the method for producing a granular decorative material-exposed exterior precast concrete board according to the present invention, an amorphous material is attached to each of the quartz glass particles selected and used as the granular decorative material on the steel formwork bed surface. Since it is slightly lifted and fixed in a dotted state, the layer thickness of this irregular material becomes a polishing allowance for polishing. In addition, the concrete surface is polished at a young age when the cast concrete is still hardened, so that it does not require a very powerful polishing machine or hard polishing work, and the polishing finish can be carried out easily and efficiently. In addition, since it is polished by the thickness of the attached amorphous material, the exposed surface of the quartz glass particles can be hardly damaged. As a result, the quartz glass particles are exposed to the concrete surface as an exposed surface only when the amorphous material is ground, but even if the exposure is slight, it reflects when receiving light and shines brightly. An appearance with an excellent design taste can be obtained.
In addition, since only the thickness of the amorphous material serving as the polishing allowance is polished, most of the quartz glass particles can be strongly restrained and held in the state embedded in the concrete. In addition, since only the quartz glass grains having a short side of 20 mm or more and a large particle diameter are used and the long side direction of the quartz glass grains is fixed in a direction standing perpendicular to the formwork bed surface, a highly stable fixed state There is no worry about peeling.

One quartz glass particle as the granular decorative material 3 can be floated and supported on the bed surface 2 with a certain height on the steel formwork bed surface 2 with a cosmetic effect. A curable amorphous material 4 is attached and fixed in a spotted state slightly lifted from the bed surface 2. After the amorphous material 4 is cured, bar arrangement 6 is performed on the bed surface 2 and concrete 5 is placed in the formwork bed 1. The cast concrete 5 is demolded when it is young, and the surface of the inverted concrete plate 5 is polished to the extent that the thickness of the amorphous material 4 is removed.

  FIG. 1A shows a cross-sectional view of a stage in which granular decorative materials 3 are arranged on the upper surface 2 of a steel formwork bed 1 and arranged cosmetically, and are spotted and fixed with an amorphous material 4. FIG. 1B shows an enlarged view of the spot fixing. In the present embodiment, quartz glass particles are individually supported as a granular decorative material 3 and are supported and fixed on the upper surface 2 of the bed 1 with a certain height as shown in FIG. Therefore, the amorphous material 4 has a viscosity and adhesive force that can support the quartz glass particles 3 with a height of about 5 mm, specifically, a modified silicone sealant, an elastic adhesive, or clay. Etc. There are two types of modified silicone sealants: one-component type that cures from the surface by reacting with moisture in the air, and two-component type in which the modified silicone polymer is cured by reacting with a curing agent catalyst. May be used (the invention according to claim 3).

  The quartz glass particles used as the granular decorative material 3 are very hard and not easily damaged, and are glossy and have a characteristic of reflecting and shining when receiving light. In addition, unlike general glass grains, it is not eroded by the alkali component of concrete, so it does not lose its luster due to white turbidity. As the quartz glass particles 3 used in the present embodiment, only crushed particles having a large particle size with a short side length of 20 mm or more that are not passed through a 20 mm × 20 mm mesh screen are used. The amorphous material 4 is attached to the surface of the quartz glass grain 3 to a thickness of at least about 5 mm, and the long side direction of the quartz glass grain 3 is perpendicular to the upper surface 2 of the formwork bed 1 as shown in FIG. And fixed in a dotted state floating from the upper surface 2 of the bed 1 by the thickness of the amorphous material 4 (the invention according to claim 2).

  At this time, as shown in FIG. 2, when the spacer 7 is included in the dumpling of the amorphous material 4 and the quartz glass particles 3 are pointed to stand on the upper surface 2 of the bed 1 through the spacer 7, It can be reliably supported in a state of being lifted from the bed surface 2 having a height equal to the height of the spacer 7, and the work efficiency and accuracy are improved (the invention according to claim 5).

  In the case of the present invention, limestone aggregate may be used in combination with quartz glass particles as the granular decorative material 3. Limestone is a hard sedimentary rock composed mainly of calcite (calcium carbonate). Limestone, an aggregate of small crystals of calcite, also reflects light, so it shines shiningly when it receives light. Moreover, since the glass is not eroded by the alkaline component of the concrete as in the case of the quartz glass particles 3, the gloss is not lost (the invention according to claim 4).

  FIG. 3 shows a perspective view of a stage in which reinforcing bars 6 are arranged in the mold bed 1 after the amorphous material 4 attached to the quartz glass particles 3 is cured. FIG. 4 shows a cross-sectional view of the stage where the concrete 5 is placed in the formwork bed 1 in which the reinforcing bars 6 are arranged. The presence of the rebar 6 prevents a problem that the quartz glass 3...

FIG. 5A shows the surface where the shaped concrete plate 5 is removed from the formwork bed 1 and the amorphous material 4 attached to the quartz glass particles 3 appears when the cast concrete 5 is hardened at a young age. Sectional drawing of the concrete board 5 turned over so that it may become is shown. FIG. 5B shows an enlarged view of the embedded state of the quartz glass particles 3 in the inverted concrete plate 5. The stage at which the cast concrete 5 is young is, for example, a stage where it has developed a strength sufficient to withstand demolding and turning over, specifically, 4 to 5 days after placing the concrete, the compressive strength Refers to the stage where the pressure reaches about 18 N / mm ² .

  FIG. 6A shows a cross-sectional view of the stage in which the upper surface of the inverted concrete plate 5 is scraped and polished by a polishing machine by the thickness of the amorphous material 4 and the surface of the quartz glass particles 3 is exposed on the surface of the concrete plate 5. . FIG. 6B shows an enlarged view of the exposed state of the quartz glass particles 3. At the time of this polishing operation, the concrete plate 5 is still at a young age, so that it can be easily and efficiently polished without requiring a very powerful polishing machine or a hard polishing operation. Since the exposed surface of the quartz glass grain 3 is polished by the thickness of the amorphous material 4 serving as a polishing allowance, it does not need to be damaged much. Even if it is polished to some extent, the hard quartz glass particles 3 are not damaged so as not to lose their luster, so there is no worry. Even if the degree of exposure of the quartz glass particles 3 exposed in this way is slight, the quartz glass particles 3 are reflected and shone when they receive light, so that an appearance with an excellent design taste can be obtained.

  In the present invention, as shown in FIG. 6B, only the thickness of the amorphous material 4 serving as a polishing allowance is polished, so that most of the quartz glass particles 3 can be embedded in the concrete 5. In addition, as described above, only the quartz glass grains 3 having a short side of 20 mm or more and a large particle size are used, and the long side direction of the quartz glass grains 3 stands perpendicular to the upper surface 2 of the mold bed 1. Since it is fixed, it is excellent in restraint and holding state, and it becomes a highly stable fixed state without worrying about peeling.

  When the concrete board 5 is completely cured after about 28 days from the placement of the concrete, only the concrete portion on the upper surface of the concrete board 5 is, for example, clear-coated or a permeable water-absorbing waterproofing material is applied in order to enhance waterproofness. And finish.

A is a cross-sectional view of a formwork bed showing a stage in which quartz glass particles are laid and fixed in a decorative manner, and B is an enlarged view of a fixed state of quartz glass particles. It is the enlarged view which showed the Example which fixed the quartz glass grain with the amorphous material containing a spacer. It is a perspective view of the formwork bed which gave reinforcement. It is sectional drawing which showed the step which laid concrete on the formwork bed. A is a cross-sectional view of a concrete plate that has been demolded and turned inside out, and B is an enlarged view of quartz glass grains embedded in the concrete plate that has been turned over. A is a cross-sectional view of a concrete plate showing a stage where the upper surface of the concrete is polished to expose the quartz glass grains, and B is an enlarged view of the exposed quartz glass grains.

Explanation of symbols

1 Formwork bed 2 Formwork bed surface 3 Granular decorative material (quartz glass grain)
4 Amorphous material 5 Concrete (plate)
6 Rebar 7 Spacer

Claims (5)

In the method for producing a granular decorative material exposed mold exterior precast concrete plate, in which a granular decorative material is laid and fixed on the mold bed surface, and concrete is placed in the mold bed and molded.
Viscosity and adhesive strength that can be supported with a certain height floating on the bed surface, with one piece of quartz glass particles as a granular decorative material on the surface of the steel formwork bed. Attached with a curable amorphous material having, and fixed to a dotted state slightly lifted from the bed upper surface using the thickness of the amorphous material,
After the amorphous material has hardened, place the bars on the bed surface, place concrete in the formwork bed, remove the mold when the concrete is young, and turn the molded concrete board upside down A method for producing a granular decorative material-exposed exterior precast concrete board, wherein the surface is polished and finished to an extent that the thickness of the amorphous material is removed. Quartz glass particles as a granular decorative material use crushed particles having a short side length of 20 mm or more and a large particle size, and the quartz glass particles are hardened so that the long side direction of the quartz glass particles stands perpendicular to the formwork bed surface. The method for producing a granular decorative material exposed-type exterior precast concrete board according to claim 1, wherein the material is fixed with an indeterminate amorphous material. Curable amorphous material, characterized in that it is a modified silicone sealant or an elastic adhesive or clay, the manufacturing method of the particulate decorative material Exposed exterior precast concrete plate as claimed in claim 1 or 2.   The method for producing a granular decorative material-exposed exterior precast concrete plate according to claim 1 or 2, wherein limestone aggregate is used in combination with quartz glass particles as the granular decorative material. The granular decorative material is fixed with a curable amorphous material including a spacer that is supported by being floated at a certain height between the granular decorative material and the formwork bed surface. The manufacturing method of the granular cosmetic material exposure type exterior precast concrete board described in 2.

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