JPH04333765A - Placing method for wall concrete - Google Patents

Abstract

PURPOSE:To build a concrete wall having an uneven surface formed on a surface. CONSTITUTION:Lines of protrusion or protrusions 12 are formed on the inner surface of forms 10. A soft sheet 11 reinforced with fibers is attached and uncured concrete is placed. Dovetail tenon holes or dovetail groove-form recessed parts are formed in a concrete surface after curing. Thus, a concrete wall the adhesion strength of which is high and on which tiles can be extremely firmly stuck can be built. Since the soft sheet 11 has an enough strength, when the sheet is peeled from a cured concrete surface, no breakage occurs. Further, the sheet can be firmly attached to the forms by means of staples.

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] A method for placing wall concrete according to claim 1 is a method for placing wall concrete in which uncured concrete is placed in a formwork, which has a large number of protrusions or ridges on the surface. A method for placing wall concrete in which a non-water-absorbing soft sheet is attached to the inner surface of a formwork, and dovetail holes or dovetail groove-like recesses are formed on the concrete surface after hardening, the soft sheet comprising: It is characterized by being at least partially reinforced with fibers.

[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. Since this soft sheet is generally a non-water-absorbing resin or rubber sheet, it also has good peelability (mold releasability) from concrete. Moreover, since the soft sheet is reinforced with fibers, sufficient strength is ensured and the soft sheet will not be damaged when it is attached to a formwork or peeled off from concrete. Therefore, the soft sheet can be used repeatedly, and no sheet fragments remain on the hardened concrete wall surface, which is extremely advantageous.

[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 12 of the soft sheet 11 shown in FIG. 1 expand into a flattened shape with a thick tip as shown in FIG. Since the unhardened concrete 13 is hardened in this step, a dovetail hole or dovetail groove-shaped recess 14a with a narrow entrance is formed in the demolded concrete wall 14, as shown in FIG. The mortar 15 adheres to the recessed portion 14a with such a narrow entrance extremely highly.

[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 non-water-absorbing soft sheet 11 having a large number of protrusions or protrusions 12 formed on the inner surface of the formwork 10, for example, is used. , a soft sheet 16 having protrusions 16a shown in FIG. 5, etc. are attached. Then, according to the usual method,
Unhardened concrete 13 is poured (Fig. 2) and removed from the mold after hardening (Fig. 4).

[0013] During this demolding, since the soft sheet 11 is reinforced with fibers and is non-water absorbing, as described above, the soft sheet 11 itself does not break. It can be easily peeled off from the hardened concrete surface without damaging the vicinity of the recess 14a.

The concrete wall 14 formed by such a method has a dovetail hole or a dovetail groove-like recess 1 with a narrow entrance, as described above, by the projections or ridges 12 of the soft sheet 11.
4a, the mortar 15, such as base mortar or paste 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.

[0015] As the fiber reinforcement form of the soft sheet used in the present invention, the following can be adopted, for example. ■ A sheet with fibers dispersed within it. For example, thin FRP sheets, etc. ■ A sheet made of woven or non-woven fibers impregnated with resin. ■ A sheet made of laminated woven or non-woven fibers.

[0016] Such fiber reinforcement does not need to be applied to the entire soft sheet, but may be applied to only a portion of the soft sheet. For example, only the portion of the base membrane other than the protrusions or ridges may be reinforced with fibers.

Note that various shapes of the protrusions and ridges of the soft sheet can be adopted. For example, in addition to the soft sheet 16 shown in FIG. 5, a soft sheet 17 having protrusions 17a shown in FIG. 6, etc. can also be used. These protrusions and protrusions may have a flattened shape from the beginning (that is, even if no concrete side pressure is applied). Further, the protrusions or protrusions of the soft sheet may be hollow, solid, or porous with a large number of independent pores. Therefore, a foamed sheet having hollow protrusions can also be used as the soft sheet.

Furthermore, the protrusions or protrusions of the soft sheet are not limited to those oriented in one direction, but may be oriented regularly or irregularly in various directions. For example, the 9th
As shown in the figure, the soft sheet 18 may have substantially cylindrical protrusions 18a formed so as to be randomly inclined in various directions. With such a soft sheet 18, even if the protrusions 18a are not sufficiently deformed into a tapered flat shape due to concrete pressure, recessed holes facing different directions will be formed in the concrete wall, and multiple recessed holes will The overall wedge effect results in significantly higher mortar adhesion strength.

In the present invention, there are no particular restrictions on the size of the protrusions or protrusions on the soft sheet, the number of protrusions per unit area, etc., and they are appropriately selected to the extent that sufficient adhesion strength with the mortar can be obtained. In normal cases, the height (h in Figures 5 and 6) of the protrusion or protrusion is 3 to 5 mm, and the width (h in Figures 5 and 6).
W) in the figure is 10 to 30 mm, soft sheet area 10
The area occupied by the protrusions or protrusions per cm2 is 2 to 7 cm.
It is preferable to set it to 2. If the projections or ridges have the size and area ratio within the above range, they will not cause cracks in the concrete, and the projections or ridges will not be damaged by the pressure of the concrete, resulting in good workability. Concrete walls can be formed.

[0020] 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 staples or double-sided tape can be employed. When attached using staples, the flexible sheet used in the present invention is reinforced with fibers, so it can be attached effectively and firmly without being damaged by staples, which is extremely advantageous. The soft sheet may be provided on the entire inner surface of the formwork, or may be provided only on a portion thereof.

[0021]

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. In particular, since the soft sheet used in the present invention is reinforced with fibers, it has sufficient strength, prevents damage when attached to a formwork or peeled off from a concrete surface, and can be used repeatedly.

[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.

FIG. 9 is a perspective view showing another embodiment of the soft sheet.

[Explanation of symbols]

10 Formwork 11 Soft sheet 12　Protrusion or ridge 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 non-water-absorbing soft sheet having a large number of protrusions or ridges on the surface is attached to the inner surface of the formwork, and the hardened concrete is placed inside the formwork. A method for placing wall concrete in which dovetail holes or dovetail groove-like recesses are formed in the subsequent concrete surface, wherein the soft sheet is at least partially reinforced with fibers. How to place concrete.