JPH0952211A - Pca panel and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a PCa (precast concrete) panel and a manufacture thereof which prevent practically the sticking of a foreign substance such as dust to the sticking surface of the panel with postcast concrete, facilitate washing and enable attainment of a high sticking strength. SOLUTION: A perforated plate wherein a plurality of hole parts are provided is disposed on the side of the sticking surface 6a of PCa panel 6 with postcast concrete 12 in a form for manufacturing the PCa panel. Thereby the PCa panel 6 of which the sticking surface 6a is constituted of a flat surface 9 and a plurality of projections 10 formed by the hole parts and projecting from the flat surface 9 is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PCa panel having improved adhesion strength to post-cast concrete and the Pa panel.
The present invention relates to a method for manufacturing a Ca panel.

[0002]

2. Description of the Related Art In recent years, when constructing reinforced concrete columns, walls, floors, etc., the weir plates themselves have been removed from the formwork in order to shorten the construction period, save temporary materials, and facilitate construction. Unused driving formwork is being used frequently. For example, in the construction of a pillar, precast concrete (abbreviated as PCa in this specification) plates are built into four side surfaces of the pillar as a driving form, and cast-in-place concrete is placed inside the pillar to form an integrated body. The wall construction method is used for thin wall PC with tile driving.
A method is adopted in which the a plate is built in as a formwork for the outer wall, the wall is reinforced inside, and then integrated with cast-in-place concrete. In addition, as the synthetic floor construction method, a construction method is adopted in which half PCa floor boards with truss reinforcements to be the lower formwork are bridged over the beams, floor reinforcement is performed, and cast in place concrete is integrated. ing.

By the way, in the PCa panel used as such a casting form, it is important to obtain sufficient adhesion strength with the post-cast concrete such as the above-mentioned cast-in-place concrete. Therefore, conventionally, the above-mentioned PC
When a panel is manufactured, a ridge sheet is laid on the inner mold surface of the mold for manufacturing, or a pressing plate having an uneven portion is pressed onto the upper surface of the PC after the concrete is cast, thereby An uneven portion is formed on a lower surface or an upper surface which is an adhesion surface with the post-cast concrete, and the mutual adhesion strength is improved by the anchor effect between the post-cast concrete and the above-mentioned uneven portion.

[0004]

However, in such a conventional method for manufacturing a PCa panel and the PCa panel obtained by such a conventional method, since a concave portion is formed on the adhesion surface with the post-cast concrete, Foreign matter such as dust is likely to accumulate in the concave portion before the placing of the post-cast concrete, and it is difficult to clean it, and when pouring the post-cast concrete, air and excess water are likely to accumulate in the concave portion, resulting in There is a drawback that sufficient bond strength cannot be obtained, and in particular for construction concrete with a large slump value, the physical bond strength is further reduced by bleeding water and impurities, and the problem of lack of stability of bonding there were. And, if the adhesion to the post-cast concrete is poor in this way, dew condensation will occur at the joint interface over time, creating gaps, and when used on outer walls, columns, etc. However, there is a problem in that it causes a decrease in sex.

The present invention has been made to effectively solve the problems of the conventional method of manufacturing a PCa panel and the PCa panel obtained thereby, and the surface adhered to the post-cast concrete is free from dust and the like. It is an object of the present invention to provide a PCa panel and a method for manufacturing the same, in which foreign matter is unlikely to adhere, cleaning is easy, and high adhesion strength is obtained.

[0006]

The PCa panel according to the present invention as set forth in claim 1 has an adhesion surface with post-cast concrete,
It is characterized in that it is composed of a flat surface and a plurality of convex portions formed integrally with the flat surface and projecting therefrom.

A PC according to the present invention according to claim 2
The method for manufacturing an a-panel is the same as the above-mentioned PCa in a frame for manufacturing a PCa panel, in which a perforated plate having a plurality of holes is formed.
By arranging the panel on the adhesion surface side with the post-cast concrete, a plurality of convex portions defined by the holes are formed on the adhesion surface of the PCa panel.

According to a third aspect of the present invention, the perforated plate is installed on a concrete placing surface of the formwork,
On the other hand, the invention according to claim 4 is characterized in that concrete is first poured into the mold, and the concrete is deformed at a time when the concrete can be deformed. It is characterized in that a perforated plate is pressed against the surface of concrete until the hole is filled with the concrete. Further, the invention according to claim 5 is characterized in that the aperture ratio of the perforated plate according to any one of claims 2 to 4 is 5 to 95%.

A PC according to any one of claims 2 to 4.
According to the method for producing an a panel and the PCa panel according to claim 1 obtained thereby, the surface of the PCa panel to be adhered to the post-cast concrete is a flat surface having a plurality of protrusions corresponding to the holes of the perforated plate. Since the parts are formed independently and the recesses are not formed unlike the conventional one, there is no fear that foreign matter such as dust adheres before the placement of the post-cast concrete, and the cleaning is easy. Since the cleaning liquid also entirely flows down along the flat surface, there is no possibility that the cleaning liquid will remain on the adhering surface. Moreover, when the post-cast concrete is poured, as a result of the fact that no concave portion where air and water are likely to be collected is formed on the adhesion surface, the concrete flows down along the flat surface between the convex portions, so that the filling property is good. In addition, after the concrete is cast, even if the concrete shrinks in the course of hardening, peeling at the interface between the adhered surface of the PCa panel and the post-cast concrete is prevented by the convex portion, and after hardening, the Since the convex portion provides the anchor effect, it is possible to obtain stable and high adhesive strength over a long period of time.

When manufacturing the PCa panel, if the side surface of the inner frame of the manufacturing mold is the surface to be adhered to the post-cast concrete in the PCa panel, first, as in the invention described in claim 3, A perforated plate may be installed on the side of the inner mold side surface of the mold, and concrete may be placed on the mold. On the other hand, when the upper surface side of the mold becomes the adhesion surface of the PCa panel to be manufactured. According to the invention as set forth in claim 4, first, concrete is poured into the formwork, and when the concrete can be deformed, a perforated plate is provided on the surface of the concrete and the concrete is provided in the hole. Press it until it is filled. At this time, if a thin plate is attached to the upper surface of the perforated plate, it is preferable that concrete is prevented from leaking from the hole portion to the upper surface of the perforated plate.

Here, when the ratio of the area of the hole per 1 m ² of the perforated plate to the area of the part where the hole is not formed is taken as the open area ratio, this open area ratio is defined in claim 5. It is preferably 5 to 95% as in the invention of. By the way, if the porosity is out of the above range, a sufficient anchoring effect cannot be obtained between the convex portion of the PCa panel and the post-cast concrete, and the adhesive strength cannot be significantly improved. The thickness of the perforated plate is preferably 3 to 30% of the member thickness including the thickness of post-cast concrete. This is because if the thickness is less than 3%, the protrusions may be too thin and the anchor effect may be reduced, and sufficient adhesive strength may not be obtained. On the other hand, if the thickness exceeds 30%, This is because it is difficult to remove the perforated plate and the PCa panel from each other when the PCa panel is manufactured, and the convex portion may be chipped.

[0012]

1 to 4 show a PC according to the present invention.
This is for explaining the embodiment of the method for manufacturing the a panel, and reference numerals 1 and 2 in the drawing are perforated plates. Each of these perforated plates 1 and 2 is a plate-shaped member having a thickness dimension of 3 to 30% of the member thickness obtained by adding the thickness of post-cast concrete, and its material is steel, aluminum alloy, Metals such as stainless steel, various synthetic resins such as vinyl chloride resin, polyethylene resin, polypropylene resin and polycarbonate resin, wood such as plywood, particle board and fiber board, and laminated materials thereof can be used. A large number of circular hole portions 3 ... Are bored in the perforated plate 1 so as to be parallel to each other in the vertical and horizontal directions. On the other hand, in the perforated plate 2, the holes 3 ...
The holes are drilled in a zigzag pattern at 0 °. Here, in any of the perforated plates 1, 2, the perforated plates 1, 2
Are perforated so that the open area ratio, which is the ratio of the area of the hole portions 3 per 1 m ^{2 to} the area of the portion where the hole portions 3 are not formed, is in the range of 5 to 95%. It is set up.

In order to manufacture a U-shaped PCa panel using the perforated plate 1 having the above structure, as shown in FIG.
The side 5'side of the inner formwork of the U formwork 5 for manufacturing is U-shaped P
Adhesion surface 6 of Ca panel 6 with post-cast concrete
In the case of a, first, the perforated plate 1 is attached to the form 5
It is installed on the side surface 5'of, and then concrete is poured into the above-mentioned form 5. Further, when the upper surface side of the mold 7 becomes the adhesion surface 8a of the PCa panel 8 to be manufactured, concrete is first poured into the mold 7 as shown in FIG. 4 so that the concrete does not solidify. Inside, the perforated plate 1 is placed on the surface of the concrete, and the holes 3 ...
Can be filled with the above concrete. At this time, if a thin plate 11 is attached to the upper surface of the perforated plate 1,
Concrete does not leak from the holes 3 ... to the upper surface of the perforated plate 1. As described above, as shown in FIG. 5, the adhesion surface 6a (8a) with the post-cast concrete is the flat surface 9
Then, the PCa panel 6 (8) is manufactured, which is composed of the plurality of columnar convex portions 10 ... Formed integrally with the flat surface 9 and protruding therefrom.

According to the method of manufacturing a PCa panel and the PCa panel 6 (8) obtained thereby, the shape of the adhering surface 6a (8a) with the post-cast concrete is such that the flat surface 9 has holes in the perforated plate 1. .. has a shape in which a plurality of independent cylindrical protrusions 10 ... Corresponding to the parts 3 are formed. Therefore, unlike the conventional one, no recesses are formed. There is no possibility that foreign matter such as the above will adhere, and cleaning is easy, and since the cleaning liquid also entirely flows down along the flat surface 9, the cleaning liquid does not remain on the adhesion surface 6a (8a). In addition, when the post-cast concrete is poured, the adhesion surface 6a is
As a result of the fact that no concave portion where air and moisture are likely to accumulate is formed in (8a), the concrete is convex 1 along the flat surface 9.
Excellent filling property because it flows down between 0 ... In addition, after the concrete is poured, as shown in FIG. 6, even if the concrete 12 shrinks in the process of hardening, the PCa panel 6
(8) Adhesion surface 6a (8a) and post-cast concrete 12
The peeling at the interface with and is prevented by the convex portions 10 ... And the anchoring effect is obtained by the convex portions 10 ... After curing, so that stable and high adhesive strength can be obtained for a long period of time.

[0015]

EXAMPLE First, in a plate made of hard vinyl chloride resin having a length of 30 cm, a width of 30 cm and a thickness of 3 mm, a hole having a diameter of 20 mm was formed between the centers in parallel in the vertical and horizontal directions as shown in FIG. A perforated plate was obtained by making a hole at a distance of 30 mm. Then, this perforated plate was attached to the inner side surface of a U-shaped steel frame having a length of 2 m and a depth of 1 m by using a double-sided tape and screws together, and after applying an oil-based release agent on the surface, An embodiment according to the present invention in which a large number of convex portions having a diameter of 20 mm and a height of 3 mm are formed on the adhesion surface with the post-cast concrete by arranging stainless steel bars in the formwork and placing concrete A PCa panel of Example 1 was obtained. Next, except that the thickness of the hard vinyl chloride resin plate was changed to 2 mm, the diameter of the adhered surface was 20 m in the same manner as in Example 1 above.
A PCa panel of Example 2 according to the present invention in which a large number of convex portions having a height of 2 mm and a height of m were formed was obtained. Further, holes having a diameter of 20 mm were drilled in a plate having the same size as in Example 1 in a zigzag pattern of 60 ° with a center interval of 30 mm as in the case shown in FIG. Example 1 above
In the same manner as above, the diameter of the attached surface is 20mm and the height is 3mm.
A PCa panel of Example 3 according to the present invention, in which a large number of convex portions of No. 3 were formed in a staggered pattern, was obtained.

As a comparative example, a PCa panel having a flat attachment surface was obtained by placing concrete in a mold without using a perforated plate. Then, using the PCa panels of Examples 1 to 3 and the PCa panel of the comparative example thus obtained, the columnar concrete member A as shown in FIG. 7 was manufactured, and each PCa panel was manufactured by the Kenken-type adhesion test method. The adhesive strength between B and the post-cast concrete C was measured. FIG. 9 shows the dimensional values and the like of the perforated plate used in the production of the PCa panels of Examples 1 to 3 and the adhesion strength of each PCa panel obtained by the adhesion test method. As is clear from FIG. 9, in the comparative example,
PC just by making a notch to measure the adhesive strength
While the a panel was peeled off, in Examples 1 to 3 according to the present invention, a sufficient improvement in the adhesive strength was observed. Further, when the perforated plate was used for the steel U formwork and concrete was repeatedly placed, it was confirmed that the concrete could withstand 50 times of use.

According to the method of manufacturing a PCa panel according to the present invention, in addition to those shown in the above-mentioned embodiments and examples, the surface 20 as shown in FIG. It is also possible to manufacture a tile-implanted PCa panel in which the back surface 21 side that comes into contact is an embossed surface.

[0018]

As described above, according to claims 2 to 5
According to the method for producing a PCa panel according to any one of claims 1 to 3 and the PCa panel according to claim 1 obtained by the method, there is no possibility that foreign matter such as dust adheres before placing the post-cast concrete, and the PCa panel is cleaned. Since the cleaning liquid also flows down along the flat surface, the cleaning liquid does not remain on the adhering surface. Further, when the post-cast concrete is poured, the concrete flows down along the flat surface between the convex portions, so that the filling property is good, and after the concrete is cast, even if the concrete shrinks in the process of hardening, the PCa panel Detachment at the interface between the adhesive surface and the post-cast concrete is prevented by the protrusions, and the anchoring effect is obtained by the protrusions after curing, so that stable and high adhesive strength can be obtained over a long period of time. You can

[Brief description of drawings]

FIG. 1 is a plan view showing a perforated plate used in an embodiment of a method for manufacturing a PCa panel of the present invention.

FIG. 2 is a plan view showing a modified example of the perforated plate of FIG.

FIG. 3 is a vertical cross-sectional view showing an embodiment of a method for manufacturing a PCa panel of the present invention.

FIG. 4 is a vertical sectional view showing another embodiment of the method for manufacturing a PCa panel of the present invention.

FIG. 5 is a perspective view showing a PCa panel manufactured according to the above embodiment.

FIG. 6 is a vertical cross-sectional view of an essential part showing a state where post-cast concrete is placed on the PCa panel of FIG.

FIG. 7 is a perspective view showing a shape of a member used in an adhesion strength test of an example of the present invention.

FIG. 8 is a perspective view showing a tiled PCa panel manufactured according to an embodiment of the present invention.

FIG. 9 is a table showing the results of adhesion strength tests according to examples of the present invention and comparative examples.

[Explanation of symbols]

 1, 2 Perforated Plate 3 Holes 5, 7 PCa Panel Manufacturing Form 6, 8 PCa Panels 6a, 8a Adhesive Surface 9 Flat Surface 10 Convex 12 Post-cast Concrete

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hirotoshi Ikeda 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Hiroshi Shimizu 4-5-19 Ryoke, Kawaguchi City, Saitama Ohira Chemicals Co., Ltd. (72) Inventor Haruhiko Takamura 862 Yamanaka, Yamanakako-mura, Minamitsuru-gun, Yamanashi Takamura Construction Co., Ltd. (72) Inventor Moriteru 862 Yamanaka, Yamanakako-mura, Minamitsuru-gun, Yamanashi Takamura Construction Co., Ltd. Within

Claims (5)

[Claims] 1. A PC characterized in that an adhesion surface with post-cast concrete is composed of a flat surface and a plurality of convex portions formed integrally with the flat surface and protruding therefrom.
a panel. 2. A perforated plate having a plurality of holes formed therein,
By arranging the Caa panel in a formwork for manufacturing the PCa panel on the surface of the PCa panel which is attached to the post-cast concrete, a plurality of convex portions defined by the holes are formed on the attachment surface of the PCa panel. P which is characterized by
Manufacturing method of Ca panel. 3. The PCa panel according to claim 2, wherein the perforated plate is installed on an upper part of a bed of the mold or on an inner mold surface, and concrete is poured into the mold. Production method. 4. First, concrete is poured into the formwork, and then, at a time when the concrete can be deformed, the perforated plate is pressed onto the surface of the concrete until the hole is filled with the concrete. The method for manufacturing a PCa panel according to claim 2, wherein 5. The method for manufacturing a PCa panel according to claim 2, wherein the aperture ratio of the perforated plate is 5 to 95%.