JPH11277511A - Method for finishing placing face of concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for accurately and cleanly finishing a concrete placing face. SOLUTION: A concrete a is fed into a form 1 with a specified shape and before the concrete a is cured, a lid body 2 whose inner face is cleanly finished and provided with an inlet 3 at an appropriate position is fitted on the feeding face of the form 1 and a grout material b is fed and filled into a space part between the surface of the concrete a and the inner face of the lid body 2 and after filling, the inlet 3 is closely sealed under a condition where it is on the same level as the inner face of the lid body 2 and thereafter, the lid body 2 is made underside by turning back the form 1 to perform curing and after curing, the form 1 and the lid body 2 or only the lid body 2 are released to finish the placing face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finishing a cast surface of a concrete product, and more particularly to a method for accurately and beautifully finishing a cast surface of a concrete product formed by casting concrete in a formwork.

[0002]

2. Description of the Related Art Generally, in the production of concrete products, concrete is put into a mold, molded using a vibrator or the like, and then the surface of the concrete exposed at the opening of the mold, that is, the cast surface Is leveled by hand using a trowel or the like, and finished smoothly. Further, as a method of smoothing the surface of the concrete poured into the formwork, there is a method of flattening the flat surface by pressing a flat plate against the surface of the poured concrete.

[0003]

However, since the iron finishing described above is only a manual operation, the surface slightly changes depending on the pressing force of the worker on the iron, and the surface looks flat even if it looks flat. It becomes wavy, and mechanical high precision cannot be expected.

Further, in the latter method of pressing a flat plate, there is a problem that when the poured concrete is pressed by a flat plate, moisture in the concrete rises to the upper surface (breathing water), and water bubbles are formed on the surface.
In such a case, hand finishing is required by the above-described iron, but the finishing accuracy is, as described above, mechanically high accuracy cannot be expected.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a method capable of accurately and beautifully finishing a concrete casting surface.

[0006]

The technical means taken by the present invention to solve the above-mentioned problems is that concrete is poured into a mold having a predetermined shape, and the upper surface of the mold is opened before the concrete hardens. The part is covered with a lid that forms a predetermined gap with the concrete casting surface, and grout is injected and filled into the gap from the injection hole formed in the lid, and after the injection is completed, the injection port is closed with the inner surface of the lid. After sealing, flush the mold and turn the lid down to cure, and after the concrete and grout have hardened, remove both the mold and the lid or only the lid to remove the concrete product. It is characterized by obtaining. In addition, the cover is vibrated at the time of the concrete injection or after the mold is inverted after the grout material is injected and filled, so as to perform deaeration and dense driving of the material, and further remove bubbles on the surface of the grout material. You may.

[0007] The hardness (slump) of concrete to be poured into the formwork can be arbitrarily selected, but in general, it is more advantageous from the viewpoint of controlling breathing. The grout material to be injected into the gap between the concrete and the inner surface of the lid may be any of an inorganic material (for example, cement mortar, etc.) and an organic material (for example, synthetic resin material). Form (strength, texture, etc.)
Is appropriately selected according to the conditions. Also, the mold for molding may be made of metal, synthetic resin, wood, etc., and the mold of metal or synthetic resin may be molded or not molded after molding is completed. The product may be integrated with the product and used as it is.

According to the above-mentioned means, traces of air bubbles and water bubbles generated during concrete pouring or during vibration molding are covered by the grout material laminated and integrated thereon, and the outer surface of the grout material is It can be finished beautifully and accurately by the inner surface of the lid. In addition, since the breathing water generated from the grout material by inverting the mold after the grout material is injected and filled is blocked by the upper base concrete layer, no water bubble marks are generated on the outer surface of the base concrete layer. Furthermore, by vibrating the lid after the inversion, bubbles on the surface of the grout material in contact with the lid can be removed.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a process for manufacturing a concrete product according to the present invention. In the figure, reference numeral 1 denotes a mold made of metal or synthetic resin, and 2 denotes a mold that is detachably hooked to an upper surface opening of the mold 1. A lid made of metal or synthetic resin to be attached, 3 is an injection port for injecting a grout material formed at an appropriate position of the lid 2, 4 is a plug for sealing the injection port 3, a is concrete, and b is grout. Material.

Next, the production of a concrete product will be described. First, concrete a kneaded to a predetermined hardness is formed in a mold 1.
With a vibrator, and the amount is slightly changed between the surface of the concrete a and the upper edge of the mold 1 (for example, 5 to 5 mm).
20mm). (See FIG. 1 (1)) Before the hardening of the poured concrete a is almost completed, and before the hardening, the cover 2
To form a space 5 between the surface of the concrete a and the inner surface of the lid 2. (Refer to FIG. 1 (2).) The space 5 is filled with a grout material b such as mortar from the injection port 3 of the lid 2, and after the injection, the injection port 3 is flush with the inner surface of the lid 2. The state is adjusted and sealed with the stopper 4. The grout material b is injected before the concrete a poured into the mold 1 is hardened, and the grout material b
Is the amount to fill the space 5 and the grout material b
Is in contact with the inner surface of the lid 2. (See FIG. 1 (3).) The mold 1 is turned over, and the lid 2 is placed on the lower side, and light vibration is applied. (Refer to FIG. 1 (4)) Curing is performed in the inverted state, and the base concrete a and the grout material b are hardened. (See FIG. 1 (5).) When the base concrete a and the grout material b have completely hardened, the mold 1 and the lid 2 are removed from the concrete product A.
Get.

According to the above method, traces of air bubbles and water bubbles generated during vibration molding are hidden by the grout material b, and the outer surface of the grout material b adheres to the inner surface of the lid 2 and the mold 1 It is beautifully finished with inversion. or,
The slight breathing water generated from the grout material b is not a problem because it is blocked by the upper base concrete layer a.

In the case where hardened concrete is used as the base layer concrete, water is not formed inside the form even if the form is reversed at an early stage because the breathing is small. In the illustrated embodiment, the example in which the mold 1 is removed is described. However, depending on the concrete product to be manufactured, the mold may be used as it is without removing the mold. Further, it goes without saying that the method of the present invention is not limited to a rectangular product as shown, but can be applied to, for example, a shell shape or the like.

[0013]

According to the method of finishing a cast surface of a concrete product according to the present invention, the cast surface of concrete which is originally finished with a trowel or the like can be finished beautifully and accurately. Further, according to the configuration of the second aspect, it is possible to remove air bubbles on the surface of the grout material in contact with the inner surface of the lid, thereby making it possible to manufacture a concrete product having a more beautiful surface. Therefore, it is possible to provide an effective method for forming a finished surface requiring high precision and aesthetic appearance.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a finishing method according to the present invention, wherein (1) is a concrete driving step, (2) is a step of attaching a lid to an opening of a formwork, and (3) is a grout material injection. (4) shows a mold reversing step, (5) shows a curing step, and (6) shows a demolding step.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mold frame 2 ... Lid 3 ... Injection port 4 ... Plug body 5 ... Space part a ... Concrete b ... Grout material A ... Concrete product

Claims (2)

[Claims] 1. Casting concrete into a mold having a predetermined shape, before the concrete hardens, the casting surface of the mold has a beautifully finished inner surface and is provided with an inlet at an appropriate place. Attach the lid and inject and fill the grout material into the space between the concrete surface and the inner surface of the lid, and after filling, seal the injection port flush with the inner surface of the lid, and then turn the mold over. A method for finishing a concrete product driven surface, which comprises curing the concrete and grout material with the lid down, curing the concrete and grout material, and then removing the mold and the lid or removing only the lid. 2. The method according to claim 1, wherein the cover is vibrated after the mold is inverted.