JPH08291591A - Contour body for concrete column and its manufacture - Google Patents

Abstract

PURPOSE: To enhance adhesion by arranging recesses-projections in a ground design shape over the whole surface of an inner peripheral wall of a contour body for a column, and pressing concrete in recessed parts by filling the concrete in hollow parts by a post-cast method. CONSTITUTION: Air is sealed in places inside of a sheet layer, and an outer peripheral surface of an inner form is covered with an air plastic tube where bowl-shaped projecting parts are protrusively arranged in a ground design shape over the whole surface. Next, an outer form is assembled at prescribed intervals around the inner form through a reinforcement cage. Next, concrete is placed between the inner form and the outer form, and is centrifugally molded, and a concrete tubular body is molded. The inner form is diametrically contracted, and after it is removed from a mold, the air plastic sheet tube is separated from an inner peripheral surface of the concrete tubular body, and the outer form is disassembled, and a contour body 10 for a concrete column is manufactured. Concrete is placed in the contour body 10 by a post-cast method, and is engaged with bowl-shaped recessed parts 11. Therefore, adhesion of the concrete is significantly enhanced, and strength can be improved, and it can be easily manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer shell for a concrete column used in a building and a method for manufacturing the outer shell,
In particular, the present invention relates to an outer shell for a concrete column, which is formed by providing unevenness in a ground pattern on the entire inner peripheral wall, and a method for manufacturing the outer shell for a concrete column.

[0002]

2. Description of the Related Art Recently, hollow cylindrical concrete column outer casings formed by centrifugal molding or the like have come to be used as columns for buildings. Since this concrete column outer shell is formed by a method such as centrifugal molding, the outer peripheral wall surface is extremely dense and smooth, the appearance is beautiful, and the strength is also strong. It has features. Also, when using this concrete column outer shell as a building column, at the construction site, concrete is post-filled into the concrete column outer shell, and the concrete is integrally attached to the outer shell. It was used as a pillar of a building by being constructed.

In the manufacture of the conventional outer shell for concrete columns of this type, the outer mold is assembled around the inner mold having a smooth outer peripheral surface with a predetermined gap, and the inner mold and the outer mold are It has been common practice to cast concrete in the gap between the formwork and manufacture a hollow cylindrical concrete column outer shell. Therefore, since the inner peripheral wall surface of the hollow portion of the concrete outer shell formed by such a conventional manufacturing method is formed by welding concrete onto an inner formwork whose outer peripheral surface is smooth, the entire surface is smooth. Was formed.

[0004]

However, as described above, since the outer wall for the concrete column has a smooth inner wall surface of the hollow part, as described above, the concrete is formed on-site in the hollow part of the outer wall for the concrete column. When post-casting, the post-casting concrete does not adhere to the inner wall surface of the outer shell for concrete columns, and when the post-casting concrete solidifies, there is a problem that the post-casting concrete and the outer shell for concrete columns are separated. there were. When the two are separated in this way, there is also a problem that a crack is generated in the outer shell and the strength of the constructed building column is reduced.

Further, in order to solve this problem, a large number of irregularities are provided on the entire inner peripheral wall surface of the hollow portion of the concrete column outer shell, and the post-compacting concrete is press-fitted into the irregularities to obtain the post-compacting concrete. It is also conceivable to make a concave and convex engagement between the outer shell for concrete columns and thereby increase the adhesive force between them, but in order to form unevenness on the inner peripheral wall surface of the outer shell for concrete columns, When forming an outer shell for a concrete column, it was necessary to previously form irregularities on the outer peripheral surface of the inner mold used. However, if the concrete outer shell is molded using the inner mold with the unevenness on the outer peripheral surface, the inner mold and the outer shell of the concrete are unevenly engaged. There was a problem that the inner formwork could not be removed from the outer shell for concrete columns. Therefore, there is a problem that it is extremely difficult to form an outer shell for a concrete column in which unevenness is provided on the entire inner wall surface.

The outer shell for concrete columns and the method for manufacturing the same according to the present invention is a completely new technology developed in view of the above-mentioned conventional problems, and in particular, uneven surfaces are formed on the surface by sealing air. After coating the formed air plastic sheet on the inner formwork used to form the outer shell for concrete columns, after placing concrete around the inner formwork and setting the placed concrete With the air plastic sheet left, only the inner mold is demolded, then the air plastic sheet is peeled off from the inner peripheral surface of the concrete cylinder from which the inner mold has been demolded, and the inner peripheral wall has an uneven pattern. The present invention provides a method for producing an outer shell for a concrete column having the above-mentioned structure, and an outer shell for a concrete column thus produced.

[0007]

An outer shell for a concrete column according to the present invention is a technique which has fundamentally improved the above-mentioned conventional problems, and the gist of the present invention is to cast concrete. In a column outer shell used for a building formed in a hollow cylindrical shape, the concrete is characterized in that unevenness is provided in a ground pattern on the entire inner peripheral wall of the column outer shell. It is an outer shell for columns.

Further, the outer shell for concrete columns according to the present invention is also a technique which has fundamentally improved the above-mentioned conventional problems, and the gist of the present invention is to provide a predetermined shape around the inner mold which can be demolded. A method of manufacturing an outer shell for a hollow cylindrical concrete column by assembling an outer mold while maintaining the gap between the inner mold and the outer mold, and placing concrete in the gap between the inner mold and the outer mold. After covering the outer peripheral wall of the inner formwork with an air plastic sheet in which irregularities are formed on the entire surface by sealing air in various places inside the layer, concrete is cast around it and After the concrete has solidified, only the inner formwork is demolded, and the air plastic sheet is peeled off from the inner surface of the cast concrete cylinder to form unevenness on the entire inner peripheral wall of the concrete cylinder. Manufacture It is a manufacturing method of a concrete pillar for enclosures which was characterized by.

[0009]

As described above, the concrete pillar outer shell according to the present invention is provided with the unevenness on the entire inner peripheral wall of the hollow portion in a ground pattern. When the concrete is filled with, the poured concrete is press-fitted into the concave portion of the inner peripheral wall, so that the concrete can be engaged with the column outer shell. Therefore, it is possible to remarkably improve the adhesion between the cast concrete and the column outer shell.

As described above, the method for manufacturing a concrete column outer shell according to the present invention comprises the step of covering the outer peripheral wall of the inner mold with an air plastic sheet having irregularities formed on the entire surface by sealing air in some places. Since concrete is placed around it, it is possible to automatically form an uneven surface corresponding to the uneven surface of the air plastic sheet on the surface of the inner peripheral wall of the cast concrete.

In the manufacturing method of the present invention, since the outer wall of the inner mold is simply covered with the air plastic sheet as described above, after the post-cast concrete is solidified, the air plastic sheet is placed on the concrete side. The inner formwork can be smoothly demolded while leaving it in place.
Furthermore, the air plastic sheet can be easily peeled off and removed from the surface of the concrete cylinder after the inner mold is completely demolded. Therefore, the air plastic sheet can be peeled off to easily form irregularities on the entire inner peripheral wall of the concrete tubular body.

[0012]

EXAMPLE An example of an outer shell for a concrete column and a method for manufacturing the same according to the present invention will be specifically described with reference to the drawings.
1 is a partially cutaway perspective explanatory view of an outer shell for a concrete column according to the present invention, FIG. 2 is an overall explanatory view of an outer shell for a concrete column of FIG. 1, and FIG. 3 is for manufacturing the outer shell of FIG. 4 is a perspective explanatory view of a state in which the inner mold is covered with an air plastic sheet, and FIG. 5 is a perspective explanatory view of a state in which the inner mold of FIG. 4 is further covered with a reinforcing cage. 6 is a perspective explanatory view of a state where one outer mold is provided around the inner mold, and FIG. 7 is a perspective explanatory view of a state where an outer mold is attached around the inner mold.

An apparatus and a manufacturing process for manufacturing an outer shell for a concrete column according to the present invention will be described in order with reference to the drawings. That is, in FIG. 3, reference numeral 1 denotes an inner mold having a predetermined outer diameter, which has a rectangular tube shape as a whole and can be contracted as necessary. Reference numeral 2a is an angle-shaped outer mold member, and by combining two outer mold members 2a, a rectangular cylindrical outer mold 2 having a predetermined inner diameter can be formed. . When the outer mold 2 is assembled around the inner mold 1, the outer diameter of the inner mold 1 and the inner diameter of the outer mold 2 are preliminarily set so that a gap having a predetermined width is formed therebetween. It is prescribed.

Reference numeral 3 denotes an air plastic sheet tube, which is an air plastic sheet obtained by sealing air in each part of the sheet layer and projecting a bowl-shaped convex portion 4 in a ground pattern on the entire surface of the sheet. Is formed. The inner diameter of the air plastic sheet tube 3 is substantially equal to the outer diameter of the inner mold 1, and the air plastic sheet tube 3 is configured so that the outer peripheral surface of the inner mold 1 can be detachably covered. Further, the bowl-shaped convex portion 4 is provided so as to project on the entire outer peripheral surface of the air plastic sheet tube 3.

Next, as shown in FIGS. 4 to 7, after the inner formwork 1 is erected on the pillar formwork demolding table 5, the inner formwork 1 is then raised.
While covering the outer peripheral surface of the air plastic sheet tube 3,
The upper and lower edges of each are temporarily fixed to the inner formwork 1 using the adhesive tape 6 or the like. Separately, a rebar cage 7 prepared in advance is attached around the air plastic sheet tube 3 covered with the inner formwork 1 as described above.

Since this reinforcing bar cage 7 serves as a reinforcing reinforcing bar at the center of an outer shell for a concrete column, which will be described later, the inside diameter of the reinforcing bar cage 7 is made larger than the outside diameter of the inner formwork 1 by a predetermined dimension. And the inner peripheral surface of the reinforcing cage 7
The reinforcing bar cage 7 is mounted around the inner mold 1 so that a uniform gap is formed between the inner mold 1 and the outer peripheral surface of the air plastic sheet tube 3. Further, the outer mold frame 2 is formed by assembling the two angle-shaped outer mold member members 2a as described above around the rebar cage 7 with a predetermined space.

The inner mold 1 and the outer mold 2 assembled as described above.
After pouring concrete into the gap between them (not shown), the upper space of the gap is closed by a ring-shaped lid, and the vertical centrifugal molding rotary drum (not shown) is rotated to drive the concrete. It is possible to centrifuge the provided concrete and form a concrete tubular body between the inner mold 1 and the outer mold 2 as a prismatic outer shell for a pillar.

In removing the inner formwork 1, the adhesive tapes 6 provided on the upper and lower edges of the air plastic sheet tube 3 are peeled off, and then the inner formwork 1 in the air plastic sheet tube 3 is reduced in diameter. And, this is lifted with a crane to remove the shape. Subsequently, the air plastic sheet tube 3 is peeled off from the inner peripheral surface of the concrete tubular body,
Further, by disassembling the outer formwork 2 around the concrete cylinder body 1 and removing the outer formwork member 2a, a concrete column outer shell 10 according to the present invention as shown in FIGS. 1 and 2 is manufactured. Can be done.

As shown in FIG. 1 in particular, a bowl-shaped concave portion corresponding to the bowl-shaped convex portion 4 provided on the outer surface of the air plastic sheet tube 3 is formed on the entire inner peripheral surface of the concrete column outer shell 10. 11 is provided in a ground pattern. In the above embodiment, the outer shell 1 for concrete columns is used.
Although the bowl-shaped concave portion 11 was formed on the entire inner peripheral surface of No. 0, the pattern such as the size and shape of the irregularities formed on the inner peripheral surface of the concrete column outer shell 10 is the air used for the air plastic sheet tube 3. A wide variety of uneven patterns can be formed by changing the uneven pattern formed on the surface of the plastic sheet.

As the air plastic sheet, a commercially available air sheet for packing having a bumpy convex portion can be used. The air plastic sheet does not necessarily have to be formed into a tube shape and used, and the air plastic sheet can be used by being wound around the outer peripheral surface of the inner mold body 1 as it is.

The outer shell for a concrete column according to the present invention is
As mentioned above, since the uneven pattern is provided on the entire inner peripheral wall,
When concrete is post-cast into the outer casing for pillars, the concrete is press-fitted and engaged with the recesses of the inner peripheral wall in the outer casing for pillars, so that the adhesion strength of concrete can be remarkably increased. That is, when concrete is cast in the conventional column outer shell, there is almost no adhesive force of concrete and the adhesive force is close to 0, whereas the one of the present invention was used and the adhesive force was tested. As a result, the following good results were obtained.

That is, concrete is cast in the outer shell for a pillar according to the present invention to form a concrete pillar, and after the cast concrete is sufficiently solidified, one side of the pillar is located at three places (from the bottom, 350, 1310). , 2270 mm) with a width of 10 × 10 cm and a depth of post-cast concrete of 10
As a result of making attachments of mm and calculating the adhesive strength of these attachments, the following results were obtained.

The method for calculating the adhesion strength is that the size of the attachment is 10 × 10 cm, so the load P (kgf)
Adhesive strength (kgf / cm ² )
= (Below margin) Specimen A Loaded part (kgf) Adhesive strength (kgf / cm ² ) No. 1 826 8.3 No. 2 894 8.9 No. 3 1620 16.2 Average 1113 11.1 Specimen B Loaded part (kgf) Adhesive strength (kgf / cm ² ) No. 1 833 8.3 No. 2 902 9.0 No. 3 964 9.6 Average 900 9.0 As is apparent from the above test results, when the outer shell for a concrete column according to the present invention is used, the adhesive force of concrete is extremely high, and therefore the strength of the concrete column is increased. It is clear that it can be significantly increased.

[0024]

As described above, the concrete body according to the present invention is provided with the uneven pattern on the entire inner peripheral wall thereof. It is possible to significantly increase the force of attachment. Therefore, this can increase the strength of the concrete column.

Further, as described above, the outer shell for a concrete column and the method for manufacturing the same according to the present invention, as described above, after the inner mold is covered with the air plastic sheet having the uneven pattern on the surface, the concrete is cast around it. Since the outer shell for pillar is formed by forming the outer shell for pillar, an uneven pattern corresponding to the uneven pattern of the air plastic sheet can be automatically formed on the inner peripheral wall surface of the molded outer shell for pillar. In addition, the inner mold can be more easily demolded than the molded outer shell for pillar.

Further, after the inner form is removed, the air plastic sheet attached to the inner peripheral surface of the column outer shell can be easily peeled and removed. Therefore, by a simple manufacturing process, it is possible to mass-produce easily and reliably the outer shell for a concrete column having an uneven pattern on the entire inner peripheral wall, which has been conventionally difficult to manufacture.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective explanatory view of an outer shell for a concrete column according to the present invention.

FIG. 2 is an explanatory view of an entire outer shell for a concrete column of FIG.

3 is an explanatory view of components of an apparatus for manufacturing the outer shell of FIG. 1. FIG.

FIG. 4 is a perspective explanatory view showing a state where an inner plastic frame is covered with an air plastic sheet.

5 is a perspective view showing a state in which a reinforcing bar cage is further covered around the inner mold frame of FIG. 4. FIG.

FIG. 6 is a perspective explanatory view of a state where a reinforcing bar cage is provided around the inner formwork.

FIG. 7 is an explanatory perspective view showing a state in which an outer mold is attached around the inner mold.

[Explanation of symbols]

 1 Inner formwork 2 Outer formwork 2a Outer formwork member 3 Air plastic sheet tube 4 Bowl-shaped convex part 5 Column formwork demolding table 6 Adhesive tape 7 Rebar cage 10 Concrete column outer shell 11 Bowl-shaped recess

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location E04B 1/16 7121-2E E04B 1/16 D

Claims (2)

[Claims] 1. A pillar outer shell used in a building formed by casting concrete into a hollow cylindrical shape, wherein unevenness is provided in a ground pattern on the entire inner peripheral wall of the pillar outer shell. An outer shell for a concrete pillar, which is characterized by being configured. 2. A hollow cylinder in which an outer mold is assembled around a demoldable inner mold while maintaining a predetermined gap, and concrete is placed in a gap between the inner mold and the outer mold. In a method for manufacturing a shell-shaped concrete column outer shell, an air plastic sheet having irregularities formed on the entire surface by enclosing air inside the sheet layer is coated on the outer peripheral wall of the inner formwork. After that, concrete is placed around it, and after the placed concrete is solidified, only the inner formwork is demolded, and the air plastic sheet is further formed from the tubular inner surface made of the placed concrete. A method for manufacturing an outer shell for a concrete column, characterized by comprising: