JPH04261962A - Placing method of concrete wall surface - Google Patents

Abstract

PURPOSE:To obtain the even surface disposition of a concrete wall surface by suppressing an increase of thickness as well as securing the watertightness in the superposing area of resin sheets, when plural sheets of resin sheets furnishing hollow foamy projections are installed by superposing partially to the inner surface of a formwork, in order to place a concrete wall surface furnishing numerous recesses of a large adhesive strength with a mortar. CONSTITUTION:By using a formwork 1 a resin sheet 2 furnishing hollow foamy projections 3 is installed to the inside 1a thereof, a concrete wall surface furnishing nemerous recesses on the surface is placed. In this case, when the resin sheets 2 are installed to the inner surface 1a of the formwork 1 by superposing partially plural resin sheets 2, the hollow foamy projections 3 of the resin sheet 2 positioned in the lower layer in the superposing area of them are ruptured beforehand.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for placing concrete walls, and more particularly to a method for forming a wall surface that has a high adhesive strength with mortar and is suitable for tiling.

0002

[Conventional technology and its problems] Concrete wall is poured,
When constructing a tile wall surface by arranging and pasting tiles on the surface with mortar, the following problems have conventionally occurred.

[0003] Usually, tiles have dovetail-like soles, so they have a high adhesive strength with mortar. In contrast, conventional concrete walls are cast with a substantially smooth surface, so the adhesive strength with mortar is inevitably low. As a result, due to thermal expansion, thermal contraction, vibration, etc., peeling occurs at the interface between the concrete wall surface and the mortar, and there is a risk that the tile may fall off.

0004

[Means for Solving the Problems] The present applicant provided a technique capable of solving the above problems in an earlier application, Japanese Patent Application No. 76301/1999 (unpublished). The present invention is an improvement on the above-mentioned prior art, and is characterized by pouring uncured concrete into a formwork whose inner surface is equipped with a resin sheet having hollow foam protrusions. A method of pouring a concrete wall surface having a recessed portion, in which a plurality of the resin sheets are partially overlapped and attached to the inner surface of the formwork, and the resin sheet located on the lower layer side in the overlapping region of the resin sheet is formed by hollow foaming. The first step is to rupture the protrusion beforehand.

[0005]

[Operation] When a concrete wall surface is cast based on the above method, a large number of recesses are formed on the surface corresponding to the hollow foam projections of the resin sheet. Therefore, when mortar is applied to this concrete wall surface, the mortar that has entered the recesses acts as an anchor after hardening, and exhibits extremely high adhesive strength.

However, the technique described in the prior application does not assume a case where two or more resin sheets are attached to the inner surface of the mold. When the size of the formwork is large and multiple resin sheets must be used to cover the inner surface of the formwork, this is to prevent poured uncured concrete from entering between the joints of the resin sheets and the formwork. , it is necessary to partially overlap the resin sheets and attach them.

[0007] At this time, if the resin sheets are simply overlapped, the hollow foam projections will overlap and the thickness will become very large. As a result, a step is created on the poured concrete wall surface at the boundary between the polymerized region and the non-polymerized region of the resin sheet. Furthermore, since watertightness is not guaranteed in the polymerization region, uncured concrete enters between the resin sheets through the gaps between the hollow foam protrusions, making it difficult to remove the resin sheet from the concrete wall surface during demolding.

However, according to the method of the present invention, in the polymerization region of the resin sheet, the hollow foam protrusions of the resin sheet located on the lower layer side are ruptured in advance, so that the back surface of the resin sheet on the upper layer side and the resin sheet on the lower layer side are ruptured in advance. It can be brought into close contact with the surface. Therefore, since the thickness increase due to overlapping is slight, the surface quality of the poured concrete wall can be maintained almost uniform. Furthermore, since the watertightness of the polymerization area is ensured, there is no risk of uncured concrete leaking out and causing various problems.

[0009]

[Example] Hereinafter, details of a method for pouring concrete walls based on the present invention will be explained using drawings showing examples.

FIG. 1 shows a formwork 1 for pouring concrete into a wall.
This shows the main parts of The inner surface 1a of the formwork 1 is covered with a resin sheet 2 having a large number of hollow foam protrusions 3, but when the size of the formwork is large, a plurality of resin sheets 2 are used.

When a plurality of resin sheets 2 are attached, a portion of each is overlapped, but the resin sheet 2 that is attached to the inner surface 1a of the formwork and located on the lower layer side is placed in a predetermined area corresponding to the overlap margin. 4 is ruptured in advance. For this operation, a roller 20 having needle-like protrusions 21 on its circumferential surface may be used as illustrated in the drawings. Alternatively, the hollow foam projections 3 may be damaged by thermal melting using a heated roller, trowel, or the like.

Subsequently, as shown in FIG. 2, a part of another resin sheet 2 is superimposed on the resin sheet 2 in which the hollow foam protrusions 3 in the predetermined area 4 have been burst, and is attached to the inner surface 1a of the mold. . At this time, the back surface 2b of the resin sheet 2 located on the upper layer side
is in close contact with the surface 2a of the resin sheet 2 located on the lower layer side. Therefore, as shown in FIG. 3, the thickness of the overlapping region 5 increases only slightly, and watertightness is ensured.

After a plurality of resin sheets 2 are attached to the formwork 1 as described above, uncured concrete 6 is poured into the formwork 1, as shown in FIG. Resin sheet 2
Since the polymerization area 5 is in close contact with the concrete 6 in a watertight manner, there is no fear that this concrete 6 will leak out. Further, since there is almost no difference in thickness between the overlapping region 5 and the non-overlapping region, the appearance properties of the concrete wall surface to be poured are almost uniform.

Note that the hollow foam projections 3 of the resin sheet 2 are
As shown in FIG. 4, the uncured concrete 6 is flattened by pressure due to curing shrinkage. Therefore, if the formwork 1 is demolded after curing for a certain period of time, a large number of recesses 8 with narrow entrances will be formed in the concrete wall surface 7, as shown in FIG.

When mortar 9 is applied to the concrete wall surface 7 thus cast and tiles 10 are pasted as shown in FIG. Demonstrates an anchoring effect. Therefore, the adhesive strength between the concrete wall surface 7 and the mortar 9 becomes extremely high. On the other hand, the sole foot 11 also ensures sufficient adhesive strength between the tile 10 and the mortar 9. Therefore, when tiling is carried out on the concrete wall surface 7 cast by the method of the present invention, there is little risk that the tiles 10 will fall off.

The embodiments of the present invention are not limited to those described above, and various modifications may be made depending on the mode of implementation. For example, regarding the resin sheet, there are no restrictions on the shape, size, number of hollow foam protrusions per unit area, etc., and they are appropriately selected so as to obtain sufficient adhesive strength between the concrete wall surface and the mortar. Furthermore, the means for attaching the resin sheet to the inner surface of the mold is not particularly limited, and any appropriate means such as double-sided tape or tacker may be employed depending on the construction situation. Furthermore, the resin sheet is not only attached to the entire inner surface of the formwork, but also
If necessary, it is also possible to attach it to only a part of the inner surface of the formwork.

[0017]

[Effects of the Invention] As is clear from the above explanation, the method for placing concrete walls according to the present invention provides excellent bonding strength between mortar and concrete walls, which was obtained by the applicant's prior art. It is possible to use a plurality of resin sheets without any loss in quality. Therefore, it is possible to use a formwork having a wide area that cannot be covered with a single resin sheet, thereby improving concrete wall casting efficiency.

Furthermore, when attaching a plurality of resin sheets to the inner surface of the mold, some of them are overlapped, but by adopting the method of the present invention, the watertightness of the polymerization area is ensured,
Since there is almost no increase in sheet thickness, it is possible to cast concrete walls with uniform surface texture over a wide range.

[Brief explanation of the drawing]

1] Figure (a) is a side sectional view showing the main parts of a mold with a resin sheet attached to the inner surface, and Figure (b) is a side view showing an example of a roller for bursting hollow foam protrusions. It is a diagram.

FIG. 2 is a side cross-sectional view showing a state in which a predetermined region of a resin sheet attached to a formwork is ruptured, and a main part of another resin sheet to be polymerized.

FIG. 3 is a side sectional view showing the main parts of the resin sheets partially overlapped and attached to the formwork.

FIG. 4 is a side sectional view of a main part showing a state in which uncured concrete is poured into a formwork.

FIG. 5 is a side sectional view showing a main part of a concrete wall surface that has been cast.

FIG. 6 is a side cross-sectional view showing the main part of a concrete wall with mortar applied and tiles attached.

[Explanation of symbols]

Claims (1)

[Claims] 1. A method for pouring uncured concrete into a formwork whose inner surface is equipped with a resin sheet having hollow foam protrusions to form a concrete wall surface having a large number of recesses on the surface, the method comprising: A method for placing a concrete wall surface, which comprises bursting in advance the hollow foam protrusions of the resin sheet located on the lower layer side in the overlapping region of the resin sheet when the sheets are partially overlapped and attached to the inner surface of the formwork.