JPH04333763A - Placing method for wall concrete - Google Patents

Abstract

PURPOSE:To form a concrete wall having excellent adhesion to mortar. CONSTITUTION:A soft sheet 11 having protrusions 11a the hollow part of which is filled with incombustible liquid fluid 12 is attached on the inner surface of forms 10 and concrete 13 is placed. Dovetail tenon holes are formed in a concrete surface after curing. Thus, since the dovetail tenon holes are formed, adhesion to mortar is high and an enough high joining strength is provided. The sheet is well suitable for a tile-lined built wall surface. Since the hollow is filled with the incombustible liquid fluid 12, the protrusion 11a is prevented from breakage owing to a side pressure A. Further, combustion spread is difficult to occur.

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 wall concrete, and more particularly to a method for placing wall concrete that is suitably employed in constructing a wall surface to be tiled.

0002

BACKGROUND OF THE INVENTION Conventionally, in order to form a tile wall surface, uncured concrete is first placed in a form and then removed from the mold to construct a concrete wall. Then, as shown in FIG. 7, a base mortar 2 is applied to the wall surface of the concrete wall 1, and a tile 4 with a pasting mortar 3 on the back side is pressed onto the base mortar 2. Further, as shown in FIG. 8, the base mortar is omitted and the tiles 4 are directly attached to the concrete wall 1 using only the attaching mortar 3.

[0003] In the conventional method of constructing a concrete wall, the wall surface of the concrete wall formed is a flat finished surface that matches the inner surface of the formwork. For this reason, the adhesion between the wall surface of the concrete wall 1 and the base mortar 2 or the attachment mortar 3 is not sufficiently established, and the base mortar 2 or the attachment mortar 3 is likely to peel off from the concrete wall 1, resulting in a tile falling accident. be.

[0004] In order to solve this problem, Japanese Patent Publication No. 50-31371 discloses that if a piece of sponge is attached to the surface of the formwork, this piece of sponge will absorb the moisture in the poured concrete. It is described that the concrete swells and forms recesses on the demolded concrete surface, increasing the adhesion of the underlying mortar.

[0005]

[Problem to be solved by the invention] However,
When we actually tested the method of No. 31371, we found that the cement components in the concrete penetrated into the sponge, and the sponge also became hard, and the sponge and concrete stuck together, making it necessary to use strong force to remove the mold. However, there was a problem in that the peripheral edge of the recess was easily damaged during demolding. Furthermore, there was also the problem that the sponge remained in the recess, impairing the adhesion of the underlying mortar.

The present invention solves the above-mentioned conventional problems, and provides a wall concrete suitable for constructing a wall surface to be tiled, that is, capable of forming a wall surface with extremely excellent bonding properties with base mortar and pasting mortar. The purpose is to provide a method for placing concrete.

[0007]

[Means for Solving the Problems] The wall concrete placing method of the present invention is a wall concrete placing method in which uncured concrete is placed in a formwork, and in which a large number of soft protrusions or ridges are formed on the surface. A method for placing wall concrete in which a soft sheet having a structure is attached to the inner surface of a formwork, and dovetail holes or dovetail groove-like recesses are formed in the concrete surface after hardening, the method comprising: A non-combustible liquid fluid is sealed in the container.

[0008]

[Operation] In the present invention, since a soft sheet having a large number of protrusions or ridges is attached to the inner surface of the formwork in which uncured concrete is poured, the concrete surface after demolding is covered with the protrusions or ridges of the soft sheet. It is formed with unevenness derived from the protrusions. Moreover, the protrusions or protrusions of the soft sheet,
Because they are soft and have a nonflammable liquid fluid sealed inside them, the protrusions or protrusions can sufficiently withstand the lateral pressure of uncured concrete, which will be described later, and will also be able to withstand the lateral pressure of unhardened concrete, which will be described later. This prevents the soft sheet from spreading, preventing major accidents. Further, when the used soft sheet is incinerated, the flame does not suddenly rise, and the incineration can be done gently. Note that this soft sheet is usually made of non-water-absorbing resin or rubber, etc.
It also has good peelability (mold releasability) from concrete.

[0009] Concrete walls with such unevenness have extremely high bonding strength with mortar, and when tiles are attached using base mortar or attachment mortar, tiles are prevented from falling off.

In particular, the protrusions or protrusions 11a of the soft sheet 11 shown in FIG. 1 are subjected to pressure (lateral pressure) A due to curing shrinkage of the uncured concrete 13, and expand into a flattened shape with a thick tip as shown in FIG. Since the unhardened concrete 13 hardens in this state, as shown in FIG.
4a is formed. The mortar 15 adheres to the recessed portion 14a with such a narrow entrance extremely highly. At this time, if the pressure (lateral pressure) A is large, there is a risk that the hollow protrusion or protrusion ruptures, but in the present invention, the protrusion or protrusion 11
Since the liquid fluid 12 is sealed inside a, the pressure resistance of the protrusion or protrusion 11a is increased, and damage due to side pressure is prevented. Note that since the fluid 12 is sealed in the projection or ridge 11a, there is no problem in deforming the projection or ridge 11a, and the narrow inlet dovetail hole or dovetail groove-like recess 1
5a can be formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings. FIGS. 1, 2, 3, and 4 are cross-sectional views illustrating one embodiment of the wall concrete placing method of the present invention.

As shown in FIG. 1, in the present invention, when pouring uncured concrete, a protrusion or protrusion 11a having a hollow part filled with a nonflammable liquid fluid 12 is formed on the inner surface of the formwork 10.
Attach the soft sheet 11 having the following properties. For example, a rubber sheet 16 having protrusions 16a filled with a nonflammable liquid fluid is attached to the hollow portion shown in FIG. 5. After that, unhardened concrete 13 is poured according to the usual method (Fig. 2),
After hardening and curing, the mold is removed (Figure 3).

[0013] During this demolding, as described above, since the soft sheet 11 is generally non-water absorbent, the soft sheet can be easily peeled off from the hardened concrete surface. Of course, there is no damage to the vicinity of the recess 14a, which will be described next.

The concrete wall 14 formed by such a method has a surface structure having a dovetail hole or dovetail groove-like recess 14a with a narrow entrance as described above due to the projections or ridges 11a of the soft sheet 11. Therefore, the mortar 15, such as base mortar or pasting mortar applied to the surface, adheres very firmly to the concrete wall 14 (FIG. 4). Therefore, a concrete wall with high tile adhesion strength is formed.

In addition to the rubber sheet 16 shown in FIG.
A soft sheet 17 having protrusions 17a shown in FIG. 6 can also be used, and there are no particular restrictions on the shape, size, number of protrusions per unit area, etc. of the protrusions or protrusions, and the adhesion strength with mortar is However, in the present invention, the height (h in FIGS. 5 and 6) of the protrusion or protrusion is 3 to 5 mm, and the width (h in FIGS. 6
w) in the figure is 10 to 30 mm, and the soft sheet 1
The area covered by protrusions or protrusions per 0 cm2 is 2 to 7
cm2 is preferred. If the protrusions or protrusions have such a size and proportion, damage to the soft sheet due to the lateral pressure can be more reliably prevented, and cracks will not occur on the concrete surface to be formed, and the adhesion of mortar will be improved. A significantly superior concrete surface can be formed.

[0016] As the nonflammable liquid fluid sealed in the hollow portion of such a protrusion or protrusion, water or a jelly-like product obtained by dissolving methylcellulose in water can be used. In particular, a jelly-like material is extremely advantageous because even if the protrusion or protrusion ruptures, it will not easily flow out. Such a nonflammable liquid fluid does not necessarily need to be filled in the hollow part of the protrusion or protrusion, and may be sealed with some hollow part left.

In the present invention, the protrusions and ridges of the soft sheet may have a flattened shape from the beginning (that is, even if no concrete side pressure is applied).

[0018] There is no particular restriction on the method of attaching such a soft sheet to the inner surface of the mold, and various methods such as using a tacker or double-sided tape can be employed. The soft sheet may be provided on the entire inner surface of the formwork, or may be provided only on a portion thereof.

[0019]

As described above in detail, according to the wall concrete placing method of the present invention, a concrete wall having an uneven surface can be easily and reliably formed. The formed concrete wall has strong adhesion with mortar and a sufficiently high bonding strength, making it extremely suitable as a wall surface for tiling. Moreover, during construction, there is no fear of damage to the soft sheet or spread of fire due to ignition, and it is excellent in workability and handling.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one implementation method of the present invention.

FIG. 2 is a sectional view showing one implementation method of the present invention.

FIG. 3 is a cross-sectional view showing one implementation method of the present invention.

FIG. 4 is a sectional view showing one implementation method of the present invention.

FIG. 5 is a perspective view showing an example of a soft sheet.

FIG. 6 is a perspective view showing an example of a soft sheet.

FIG. 7 is a sectional view showing a tiling method.

FIG. 8 is a cross-sectional view showing a tiling method.

[Explanation of symbols]

10 Formwork 11 Soft sheet 11a Protrusion or ridge 12 Nonflammable liquid fluid 13 Uncured concrete 14 Concrete wall 14a Recessed part 15 Mortar

Claims (1)

[Claims] Claim 1: In a wall concrete placing method in which unhardened concrete is poured into a formwork, a soft sheet having a large number of soft protrusions or ridges on the surface is attached to the inner surface of the formwork, and after hardening, A method for placing wall concrete in which dovetail holes or dovetail groove-like recesses are formed in the concrete surface of a concrete surface, characterized in that a nonflammable liquid fluid is sealed inside the protrusions or ridges. How to place wall concrete.