JPH10217225A - Method of manufacturing concrete article and formwork for concrete article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a concrete article capable of positively removing air bubbles of placed concrete, and having its excellently finished surface. SOLUTION: A plurality of through holes 21 piercing the front and rear surfaces are formed in a upper formwork 13 installed on the upper portion of a lower formwork 12. Between the lower formwork and the upper formwork, a closing plate 14 comprising a sheet plate is provided slidably along the lower surface of the upper formwork 13. A plurality of holes 22 capable of communicating with the through hoes 21 of the upper formwork 13 are made in the closing plate 14. In an open state made by causing the holes 22 of the closing plate 14 to communicate with the through holes of the upper formwork 13, concrete is placed, and air bubbles gathered at the upside are permitted to escape outward from the through holes 21; after that, before concrete cures, the closing plate 14 is allowed to slide for closing the through holes 21 and curing concrete, thereby separating concrete filled within the through hole 21 of the upper formwork 13 and an concrete article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product manufacturing method for forming a concrete product by molding concrete and a concrete product formwork.

[0002]

2. Description of the Related Art Generally, when a concrete product is manufactured by molding concrete, as shown in FIG. 8, the concrete mold is enclosed by a lower mold 1 and an upper mold 2 installed above the lower mold 1. Concrete was poured into the concrete placement space S, and the concrete was removed after curing and curing. By the way, when producing the above-mentioned concrete secondary product, air bubbles are generated in the upper part of the poured concrete. Had to be removed.

[0003]

However, the ventilation sheet needs to be attached so that the lower surface of the upper mold frame does not loosen, and there is a problem that the operation is extremely complicated. Also, a plurality of through-holes are formed in the upper formwork to remove air bubbles generated at the top from these through-holes, but when the mold is removed from the mold, the concrete filled in the through-holes is removed. There is a problem that the surface of the product is damaged due to breakage, which requires a great deal of trouble to repair, and also leads to an increase in cost and a decrease in quality.

[0004] The present invention has been made in view of the above circumstances, and it is possible to extremely easily remove air bubbles generated at the top of a poured concrete to produce a high-quality concrete product without increasing the cost. It is an object of the present invention to provide a method of manufacturing a concrete product and a formwork for the concrete product.

[0005]

According to a first aspect of the present invention, there is provided a method of manufacturing a concrete product, comprising the steps of: forming a concrete product on a lower form having a horizontal form around a bottom plate; By installing an upper mold having a plurality of through holes that penetrated,
Concrete is poured into a concrete placing space surrounded by the lower mold frame and the upper mold frame, and after bubbles contained in the concrete have entered the through holes of the upper mold frame, Before the hardening of the concrete, a closing plate made of a thin plate is slid and disposed on the lower surface side of the upper mold frame to close the through hole.

According to a second aspect of the present invention, there is provided a concrete product form having a lower form provided with a horizontal form around a bottom plate, and an upper form provided above the lower form. A concrete product mold for producing a concrete product by casting concrete in a concrete casting space surrounded by the lower mold frame and the upper mold frame and curing the concrete, wherein the upper mold frame includes A plurality of through-holes that penetrate the front and back are formed, and a closing plate made of a thin plate having a plurality of holes that can communicate with the through-holes of the upper mold is provided between the lower mold and the upper mold. The upper mold is slidably provided along the lower surface of the upper mold, and the through hole of the upper mold is opened and closed by sliding the closing plate.

According to a third aspect of the present invention, there is provided a concrete product form having a lower form provided with a horizontal form around a bottom plate, and an upper form provided above the lower form. A concrete product mold for producing a concrete product by casting concrete in a concrete casting space surrounded by the lower mold frame and the upper mold frame and curing the concrete, wherein the upper mold frame includes A plurality of through-holes are formed on the front and back sides, and the through-holes are formed in a tapered shape whose diameter is gradually reduced in a direction of releasing from a molded concrete product.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete product manufacturing method and a concrete product formwork according to an embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) First, a first embodiment will be described.
In FIG. 1, reference numeral 11 denotes a mold. This formwork 11
Is a lower mold frame 12, an upper mold frame 13 attached to the upper portion of the lower mold frame 12, and an iron plate, a resin plate, or the like disposed between the lower mold frame 12 and the upper mold frame 13. And a closing plate 14 made of a thin plate. The lower mold frame 12 includes a bottom plate portion 15,
It is composed of a horizontal frame 16 erected around the bottom plate 15, and concrete is cast in the concrete casting space S surrounded by the lower mold 12 and the upper mold 13. It has become.

As shown in FIG. 2, the upper mold frame 13 is formed with a plurality of through holes 21 penetrating from the front to the back with a space therebetween in the width direction and the longitudinal direction. A plurality of holes 22 are formed in the closing plate 14 provided between the lower mold frame 12 and the upper mold frame 13, similarly to the upper mold frame 13. Through hole 21 of upper mold frame 13
Can communicate with each other.

When a concrete product is manufactured using the formwork 11 having the above structure, a closing plate 14 is interposed between the lower formwork 12 and the upper formwork 13 as shown in FIG.
Further, concrete is poured into the concrete placing space S of the formwork 11 with the hole 22 of the closing plate 14 and the through hole 21 of the upper formwork 13 being in communication with each other. When the concrete is poured into the concrete placing space S in this manner, the air contained in the poured concrete rises upward as air bubbles, and further, the holes 22 and the through holes 21 communicated with each other. Penetrates and is released outside.

In this state, before the concrete is hardened, the closing plate 14 is slid, as shown in FIG.
The hole 2 in the closing plate 14 is
2 to close the through hole 21 of the upper mold frame 13. After the cast concrete is hardened and cured, the upper mold frame 13 and the closing plate 14 are removed, and the concrete product is removed from the lower mold frame 12 and taken out. Here, since the closing plate 14 is formed from a thin plate, when the closing plate 14 is removed, only the closing plate 14 does not scrape off the concrete that has entered the holes 22 of the closing plate 14. Removed. That is, according to the first embodiment, it is possible to manufacture an extremely high-quality concrete product from which bubbles have been removed without damaging the surface, and therefore, it is complicated and troublesome to repair the damaged surface. Repair work that leads to an increase in cost can be eliminated. In addition, since the convex part whose height is about the plate thickness of the closing plate 14 is regularly formed on the surface of the concrete product, the convex part can be used as a decoration.

(Second Embodiment) Next, a second embodiment will be described. As shown in FIG. 5 and FIG.
The through-hole 21 formed in the upper mold frame 13 which constitutes 1 is formed in a tapered shape whose diameter gradually decreases in the direction of releasing from the concrete product to be molded, that is, upward. When the upper mold frame 13 having the through hole 21 having this shape is used, the upper mold frame 1 is used without using the closing plate 14.
3 is placed directly on the lower mold frame 12.

In this state, as shown in FIG. 7, concrete is poured into the concrete placing space S surrounded by the lower mold frame 12 and the upper mold frame 13. When concrete is poured into the concrete placing space S in this manner, the air contained in the poured concrete rises upward as air bubbles, and further, the upper mold 13
Into the through-hole 21 formed in the substrate and is released to the outside.

After the cast concrete is hardened and cured, the upper mold frame 13 is removed, and the concrete product is removed from the lower mold frame 12 and taken out. Here, this upper mold 1
Since the through hole 21 formed in 3 is formed in a tapered shape whose diameter is gradually reduced in the direction of releasing from the concrete product, the through hole 21 enters the through hole 21 and is hardened when the upper mold frame 13 is released from the concrete product. Only the upper mold 13 is removed without scraping the concrete. That is, according to the second embodiment, it is possible to manufacture an extremely high-quality concrete product from which bubbles have been removed without damaging the surface, and therefore, it is complicated and troublesome to repair the damaged surface. Repair work that leads to an increase in cost can be eliminated. In addition, since the convex part made of concrete which has entered into the through hole 21 of the upper mold frame 13 is regularly formed on the surface of the concrete product, the convex part can be used as a decoration.

[0015]

As described above, according to the method for manufacturing a concrete product and the concrete product form of the present invention, the following effects can be obtained. According to the method for manufacturing a concrete product according to the first aspect, the air bubbles contained in the concrete enter into the through holes of the upper mold, and further, before the concrete hardens, the thin plate is formed on the lower surface side of the upper mold. By closing the through hole by slidably disposing the closing plate made of, it is possible to manufacture an extremely high-quality concrete product from which bubbles are removed without damaging the surface. Therefore, it is not necessary to perform a complicated and costly repair work for repairing the surface.

According to the concrete product form of the present invention, concrete is poured into the concrete placing space in a state where the hole of the closing plate communicates with the through hole of the upper form and is opened. By doing so, the air bubbles collected above the poured concrete are released from the through hole to the outside,
After that, before the concrete hardens, the concrete plate and the concrete filled in the through-hole of the upper formwork can be separated by sliding the closing plate to close the through-hole and to harden the concrete, so that the concrete can be separated. . In other words, a high-quality concrete product from which air bubbles have been removed can be produced very easily without damaging the surface, and therefore, the need for a complicated and costly repair work for repairing the surface is eliminated. Can be. According to the concrete product mold of the third aspect, the air bubbles of the poured concrete can be discharged to the outside from the through hole of the upper mold, and the diameter of the through hole is gradually reduced in the demolding direction. Since the upper mold is formed in a tapered shape, the upper mold can be very easily removed from the concrete product. In other words, a high-quality concrete product from which air bubbles have been removed can be produced very easily without damaging the surface, and therefore, the need for a complicated and costly repair work for repairing the surface is eliminated. Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a concrete product formwork according to a first embodiment of the present invention, illustrating the structure and structure of the formwork.

FIG. 2 is a perspective view of the upper mold and the closing plate for explaining the structure of the upper mold and the closing plate constituting the concrete product mold of the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a part of the concrete form for explaining the configuration and structure of the concrete product form of the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a concrete product for explaining a method for manufacturing a concrete product using the concrete product form of the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a concrete product formwork according to a second embodiment of the present invention, illustrating the structure and structure of the formwork.

FIG. 6 is a perspective view of the upper mold for explaining the structure of the upper mold constituting the concrete product mold according to the second embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a concrete product mold according to a second embodiment of the present invention, illustrating the configuration and structure of the mold.

FIG. 8 is a sectional view of a mold for explaining a schematic configuration of a mold for producing a concrete product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Formwork for concrete products 12 Lower formwork 13 Upper formwork 14 Closing plate 15 Bottom plate part 16 Horizontal formwork part 21 Through hole 22 Hole part S Concrete casting space

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Ota Ishikawashima Building Materials Co., Ltd., 1-12-1 Yurakucho, Chiyoda-ku, Tokyo

Claims (3)

[Claims] An upper mold having a plurality of through-holes penetrating on the front and back sides is provided on an upper part of a lower mold provided with a horizontal frame around a bottom plate, and the lower mold and the upper mold are provided. And placing concrete in the concrete placing space surrounded by the above, and after the bubbles contained in the concrete have entered the through holes of the upper formwork and before the concrete hardens, A method for manufacturing a concrete product, characterized in that a closing plate made of a thin plate is slid and disposed on a lower surface side of an upper mold frame to close the through hole. 2. A lower mold provided with a horizontal frame around a bottom plate, and an upper mold provided on an upper portion of the lower mold. A concrete product formwork for producing a concrete product by casting concrete in an enclosed concrete casting space and hardening the concrete formwork, wherein the upper formwork has a plurality of through holes penetrating from front to back. Formed, between the lower mold frame and the upper mold frame, a closing plate made of a thin plate having a plurality of holes that can communicate with the through holes of the upper mold frame,
A concrete product form, which is slidably provided along the lower surface of the upper form, and wherein the through-hole of the upper form is opened and closed by sliding the closing plate. 3. A lower mold provided with a horizontal frame around a bottom plate, and an upper mold provided on an upper portion of the lower mold. A concrete product formwork for producing a concrete product by casting concrete in an enclosed concrete casting space and hardening the concrete formwork, wherein the upper formwork has a plurality of through holes penetrating from front to back. A concrete product form, wherein the through hole is formed in a tapered shape whose diameter is gradually reduced in a direction of releasing from the molded concrete product.