JPH03287949A - Method for placing wall concrete - Google Patents

Abstract

PURPOSE:To enable a wall having rugged sections on the surface, to be formed by fitting a non-water-absorbing soft sheet having a plurality of the kinds of the projections of different hardnesses, on the internal surface of a form, and by deforming the projections in claviform flattened shapes with the side pressure of placed non-hardened concrete. CONSTITUTION:A non-water-absorbing soft sheet 11 having a plurality of the projections 11a of different hardnesses is fitted on the internal surface of a form 10. After that, when non-hardened concrete 12 is placed in the form 10, then pressure A due to the hardening shrinkage of the concrete 12 is applied to the projections 11a, and the projections 11a are widened in claviform flattened shapes. After that, when the form is removed from, then recessed holes with narrow inlets are formed in a concrete wall.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for placing wall concrete, and particularly to a method for placing wall concrete that is suitably employed in constructing a wall surface to be tiled.

[Prior Art] Conventionally, in order to form a tile wall surface, uncured concrete is first poured into a formwork and then removed from the form to construct a concrete wall. Then, as shown in FIG. 2, a base mortar 2 is applied to the wall surface of the concrete wall 1, and a tile 4 with mortar 3 on the back side is pressed onto the base mortar 2. Further, as shown in FIG. 3, the base mortar is omitted and the tiles 4 are directly attached to the concrete wall 1 using only the mortar 3.

In the conventional concrete wall construction method, 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 mortar 3 is not sufficient, and the mortar 3 easily peels off from the concrete wall 1 when the base mortar 2 or the base mortar 3 is attached. It has the disadvantage of causing

As an attempt to solve such problems,
Publication No. 0-31371 states that if a piece of sponge is attached to the surface of the formwork, this piece of sponge absorbs moisture in the poured concrete and swells, forming a recess on the concrete surface after demolding. , it is stated that the adhesion force of the base mortar is increased.

[Problems to be Solved by the Invention] However, when the method of Japanese Patent Publication No. 50-31371 was actually tested, the cement component in the concrete penetrated into the sponge, and the sponge became hard and the sponge and concrete became separated. There was a problem in that a strong force was required to remove the mold, and 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 is suitable for constructing a wall surface to be tiled, that is, a wall concrete that can form a wall surface with extremely excellent bonding properties with base mortar and mortar. The purpose is to provide a pouring method.

[Means for Solving the Problems] The present invention provides a method for placing uncured concrete in a formwork, in which a non-water-absorbing soft sheet having a large number of protrusions or ridges is placed on the inner surface of the formwork. The wall concrete is attached to a concrete surface and the protrusions or protrusions are deformed into a thicker, flattened shape by the lateral pressure of the poured unhardened concrete, forming a narrow concave hole in the concrete surface after hardening. The casting method is characterized in that the non-water-absorbing soft sheet has a plurality of types of projections or ridges having different hardnesses as the projections or ridges.

[Function] 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 cast, 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 non-water absorbent, it has good releasability from concrete (type III property).

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

In particular, the protrusion 11a of the soft sheet 11 shown in FIG. 1(a)
is subjected to pressure A due to curing shrinkage of the uncured concrete 12, and expands into a flattened shape with a thick tip as shown in FIG. 1(b).
Since the unhardened concrete 12 hardens in this state, a narrow concave hole 13a is formed in the demolded concrete wall 13, as shown in FIG. 1(c). Such a concave hole f3a with a narrow entrance has extremely high adhesion of the mortar 14.

By the way, when forming a concrete wall, the pressure applied to the formwork by the uncured concrete placed in the formwork via the soft sheet is naturally small at the upper part of the formwork and large at the lower part.

Therefore, the pressure applied to the protrusions or ridges of the soft sheet is small in the upper part of the formwork, and this pressure is large in the lower part.

Therefore, if the hardness of all the protrusions or ridges of the soft sheet is uniform, the pressure applied to the upper part of the formwork is small, so that the protrusions or ridges do not deform much. On the other hand, in the lower part, the protrusions or ridges are almost completely crushed due to the application of large pressure, and it may not be possible to obtain the desired deformation, that is, the thick-topped flat shape.

In the method of the present invention, projections or ridges of different hardness are provided, so that the relatively soft projections or ridges have a flattened shape above the formwork where less pressure is applied to the uncured concrete. transform. (Note that the highly hard protrusions or ridges do not deform much at the top of the formwork.)Then, since the pressure applied below the formwork is large,
A relatively hard protrusion or protrusion deforms into a flattened shape. (
Depending on the concrete pressure, low hardness protrusions or protrusions may
It can be crushed. ) In this way, in the upper part of the formwork, the low-hardness protrusions or protrusions are deformed into a tapered flat shape, and in the lower part of the formwork, the high-hardness protrusions or protrusions are deformed into a thick-tipped flat shape. , the concrete wall that is formed has narrow concave holes formed over its entire surface. Therefore, according to the method of the present invention, the adhesion of mortar over the entire concrete wall surface is significantly improved.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view illustrating an embodiment of the wall concrete casting method of the present invention.

As shown in the figure, in the present invention, when pouring uncured concrete, a non-water-absorbing soft sheet 11 having a large number of protrusions 11a of different hardness on the inner surface of the formwork 10, for example, a fourth
A rubber sheet 15 having projections 15a shown in the figure is attached. After that, according to the usual method, unhardened concrete 12
After pouring and curing (Fig. 1(b)), the mold is removed (Fig. 1(C)).

During demolding, the soft sheet 11 is easily peeled off from the hardened concrete surface since it is non-water absorbent. Of course, there is no damage to the vicinity of the recessed hole 13a, which will be described next.

The concrete wall 13 formed by such a method has a surface structure having a concave hole 13a with a narrow entrance as described above due to the protrusion 11a of the soft sheet 11.
The mortar 14, such as base mortar or adhesive mortar, applied to the surface adheres very firmly to the concrete wall 13 (FIG. 1(d)). Therefore, a concrete wall with high strength is formed when the tiles are attached.

In addition, there are no particular restrictions on the shape, size, number of protrusions per unit area, etc. of the protrusions or protrusions for the soft sheet having protrusions or protrusions, and sufficient adhesion strength with mortar can be obtained. Appropriate selection is made depending on the degree. For example, in addition to the rubber sheet 15 shown in FIG. 4, a soft sheet 16 having protrusions 16a shown in FIG. 5 may also be used.

The protrusions of the soft sheet may be hollow, solid, or porous with many independent pores. Therefore, a foamed sheet having hollow protrusions can also be used as the soft sheet.

These protrusions and protrusions may have a flat shape with a thick tip from the beginning (that is, even if no concrete side pressure is applied).

There are no particular restrictions 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.

[Effects of the Invention] As detailed above, according to the wall concrete placing method of the present invention, it is possible to reliably form a concrete wall with uneven surfaces even if the wall is a tall concrete wall. . 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.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one method of implementing the present invention, FIGS. 2 and 3 are sectional views showing a tiling method, and FIGS. 4 and 5 are sectional views showing a tiling method.
The figure is a perspective view showing an example of a soft sheet. 10... Formwork, 11... Soft sheet, 11a.
...Protrusion, 12...Uncured concrete, 13...
Concrete wall, 13a... recessed hole, 14... mortar.

Claims (1)

[Claims] (1) In a wall concrete placing method in which uncured concrete is poured into a formwork, a non-water-absorbing soft sheet having a large number of protrusions or ridges is attached to the inner surface of the formwork,
A method for placing wall concrete in which the lateral pressure of the unhardened concrete that has been placed deforms the protrusions or protrusions into a flattened shape with a thick tip to form a concave hole with a narrow entrance on the concrete surface after hardening. The non-water absorbent soft sheet is
A method for placing wall concrete characterized by having multiple types of protrusions or protrusions having different hardnesses as the protrusions or protrusions.