JPH04333767A - Placing method for wall concrete - Google Patents

Abstract

PURPOSE:To build a concrete wall having an uneven surface formed on a surface. CONSTITUTION:A soft sheet 11 having lines of protrusion or protrusions 11a is attached on the inner surface of forms 10 and uncured concrete is placed. Dovetail tenon holes or dovetail groove-form recessed parts are formed in a concrete surface after curing. A member for jointing, such as a magnet tape, is attached on the rear of the soft sheet 11. Thus, a concrete wall the adhesion strength of mortar of which is high and on which tiles can be extremely firmly stuck can be built. The soft sheet 11 is attachable and detachable to and from the forms 10, attaching and detaching of the sheet are facilitated, and a re-use is practicable.

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. 8, a base mortar 2 is applied to the wall surface of the concrete wall 1, and a tile 4 with a pasting mortar 3 placed on the back side is pressed onto the base mortar 2. Furthermore, as shown in FIG. 9, 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. A method for placing wall concrete in which a water-absorbing soft sheet is attached to the inner surface of the formwork, and dovetail holes or dovetail groove-like recesses are formed on the concrete surface after hardening, the method comprising: It is characterized by being provided with a joining member that can removably join the formwork and the soft sheet.

[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 a non-water-absorbing resin or rubber sheet, 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 expand into a flattened shape with a thick tip as shown in FIG. Since the unhardened concrete 13 is hardened in the process, as shown in FIG.
A dovetail hole or dovetail groove-shaped recess 14a with a narrow entrance is formed in the recess 14a. The mortar 15 adheres to the recessed portion 14a with such a narrow entrance extremely high.

[0011] Methods for attaching the soft sheet to the formwork include stapling, double-sided tape, etc., but these require special equipment and materials on site, and the soft sheet cannot be removed and reused. There are drawbacks such as: In contrast, in the present invention, a joining member that can removably join the formwork and the soft sheet is provided on the back side of the soft sheet, so special equipment is required separately at the site. There is no need to prepare or materials,
The soft sheet can be easily attached to and removed from the formwork. Moreover, it is also possible to reuse the soft sheet removed from the formwork.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings. Figures 1, 3, 4 and 5 are cross-sectional views illustrating an embodiment of the wall concrete casting method of the present invention, and Figure 2 is an enlarged view of the main parts of Figure 1. .

As shown in FIG. 1, in the present invention, when pouring uncured concrete, a joining member is attached to the inner surface of the formwork 10 on the back surface, and projections or protrusions 11a are formed on the surface.
The non-water-absorbent soft sheet 11 on which a ridge is formed, for example, the soft sheet 16 having protrusions 16a shown in FIG. 6, is attached by a joining method using a joining member provided on the back surface thereof. For example, as shown in FIG. 2, when attaching a soft sheet 11 with magnetic tape 12 affixed to the back side to an iron formwork 10, the magnetic tape 12 portion of the soft sheet 11 is directly applied to the formwork 10. It can be easily and stably attached using magnetic force. Thereafter, unhardened concrete 13 is poured according to a conventional method (FIG. 3), and after hardening and curing, it is removed from the mold (FIG. 4).

[0014] During this demolding, as described above, since the soft sheet 11 is non-water absorbent, the soft sheet can be easily peeled off from the hardened concrete surface. Furthermore, the vicinity of the recessed portion 14a, which will be described below, will not be damaged.

The concrete wall 14 formed by such a method has a surface structure in which a dovetail hole or dovetail groove-like recess 14a with a narrow entrance is formed by the projections or ridges 11a of the soft sheet 11, as described above. Therefore, the mortar 15, such as base mortar or pasting mortar applied to the surface, adheres very firmly to the concrete wall 14 (FIG. 5). Therefore, a concrete wall with high tile adhesion strength is formed.

[0016] In the present invention, the joining member provided on the back surface of the soft sheet may be any member that can be used to removably attach the soft sheet to the formwork, that is, to repeatedly perform mechanical or physical bonding. Although there are no particular limitations, examples include the following: ■
Magnets such as magnetic tape. In this case, if the formwork is not made of iron, attach magnetic tape or iron tape to the side of the formwork as well. ■ Tape with hook-shaped projections and loops made of high-elastic resin (product name: Velcro tape). In this case, attach Velcro tape to the necessary parts of the formwork. ■ Hook. In this case, a pair of hooks is also attached to the formwork. ■Other vinyl fasteners, etc.

[0017] Such a joining member may be provided by being attached to the back surface of the soft sheet with an adhesive or the like, or may be provided by integral molding during molding of the soft sheet.

[0018] The mounting area or number of joining members is as follows:
It may be determined as appropriate so that sufficient bonding strength can be obtained for bonding the soft sheet and the formwork.

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. 6, a soft sheet 17 having protrusions 17a shown in FIG. 7, 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.

[0020] Such a soft sheet may be provided on the entire inner surface of the mold, 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, the present invention is extremely advantageous in that the flexible sheet can be easily attached to and removed from the formwork using the joining member. Also,
It is also possible to reuse the soft sheet.

[Brief explanation of drawings]

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

2] FIG. 2 is an enlarged view of the section ■ in FIG. 1. [FIG.

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 cross-sectional view showing one implementation method of the present invention.

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

FIG. 7 is a perspective view showing an example of a soft sheet.

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

FIG. 9 is a sectional view showing a tiling method.

[Explanation of symbols]

10 Formwork 11 Soft sheet 11a Protrusion or ridge 12 Magnetic tape 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 on the subsequent concrete surface, and the formwork and the soft sheet can be removably joined to the back side of the soft sheet. A method for placing concrete for a wall, characterized in that a joining member is provided.