JP2636576B2 - Formwork for concrete casting and sheet for formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete casting formwork and a formwork sheet, and more particularly to a concrete casting formwork and a formwork suitably used for construction of a concrete wall surface to be tiled. For sheet.

[0002]

2. Description of the Related Art Conventionally, in order to form a tile wall surface, uncured concrete is first poured into a formwork and then removed from the mold to construct a concrete wall. Then, as shown in FIG. 9, a base mortar 2 is applied to the wall surface of the concrete wall 1, and a tile 4 on which a back mortar 3 is provided is pressed against the base mortar 2. In addition, as shown in FIG. 10, the base mortar is omitted, and the tile 4 is directly adhered to the concrete wall 1 using only the adhering mortar 3.

In the conventional method of constructing a concrete wall, the wall surface of the concrete wall to be formed has a flat finished surface as the inner surface of the formwork. For this reason, the adhesion between the wall surface of the concrete wall 1 and the foundation mortar 2 or the attaching mortar 3 is not sufficiently achieved, and the foundation mortar 2 or the attaching mortar 3 is easily peeled off from the concrete wall 1, causing a tile falling accident. is there.

[0004] As a method of casting wall concrete, which solves such a problem and is suitable for construction of a wall surface to be tiled, that is, it can form a wall surface which is extremely excellent in bondability with a base mortar or a pasting mortar. The present applicant has proposed a method of placing uncured concrete in a formwork by attaching a plurality of non-water-absorbing soft sheets having a large number of projections or ridges on the inner surface of the formwork. A method of casting wall concrete in which dovetail holes or dovetail-shaped recesses are formed in the hardened concrete surface has been proposed (Japanese Patent Application No. 2-78379 (Japanese Unexamined Patent Application Publication No. Hei 3-2).
No. 79565) . Hereinafter, it is referred to as “first application”. ).

[0005] According to the method of the prior application, as shown in FIG.
A flexible sheet 11 having a large number of projections or ridges 11a is attached, and thereafter, as shown in FIG. 6, an uncured concrete 12 is poured. As described above, irregularities (recesses 13a) derived from the protrusions or ridges of the soft sheet are formed.
Since this soft sheet is non-water-absorbing, it has good releasability (releasability) from concrete.

As shown in FIG. 8, the concrete wall 13 having such irregularities has a very high bonding strength with the mortar 14, and prevents the tile from falling off when the tile is stuck with the base mortar or the stuck mortar. Is done.

In particular, the projections or ridges 11a of the soft sheet 11 shown in FIG. 5 receive a pressure A due to the hardening shrinkage of the uncured concrete 12 and spread into a tapered flat shape as shown in FIG. As shown in FIG. 7, the uncured concrete 12 is hardened, and as shown in FIG.
Is formed with a dovetail hole or a dovetail-shaped recess 13a having a narrow entrance. Such a concave portion 13a having a narrow entrance has extremely high adhesion of the mortar 14.

[0008]

In constructing a concrete wall, usually, a plurality of formwork is used by arranging them in parallel in the extending direction of the wall. This formwork is made of a hard material such as wood or plastic, and due to cost, the flatness of the side surface is not strict.

For this reason, when a plurality of molds are arranged in parallel with their side surfaces in contact with each other, a gap is formed between the contact side surfaces, and uncured concrete may leak from the gap. In the method of the above-mentioned prior application, a sheet is attached in order to form irregularities on the concrete wall. As a method for attaching the sheet, there are a method of partially fixing the sheet by staples and a method of using an adhesive. With either of the staple and adhesive methods, the concrete is partially torn or peeled off by the force at the time of pouring of the concrete, the concrete flows into the space between the sheet and the formwork, and the sheet is hardly buried in the concrete body (buried). ).

[0010]

According to a first aspect of the present invention, there is provided a concrete casting mold having a non-water-absorbing soft sheet having projections or ridges on a surface thereof. The side edge of the soft sheet is wrapped around the side surface of the mold, and the protrusion or ridge is formed on one side of the soft sheet.
It is characterized in that it is provided in a portion other than the side edge portion of the surface .

[0011] The form sheet according to claim 2 is a non-water-absorbing soft sheet having a projection or a ridge provided on one surface attached to a mold surface of a concrete casting mold. Is provided on a portion other than the side edge portion of the soft sheet.

[0012]

According to the first aspect of the present invention, since the side surfaces of the formwork are covered with the soft sheet, when a plurality of formworks are arranged in parallel, the gap between the contact side surfaces of the adjacent formworks is reduced. It is absorbed by the flexibility of the soft sheet, and leakage of uncured concrete can be almost completely prevented.

In addition, since the projections or ridges of the soft sheet are located on the mold surface of the mold, as shown in FIGS.
A concrete wall having a large number of irregularities and high bonding strength with mortar can be formed. Also, this protrusion or
Is the side edge of the soft sheet that wraps around the side of the formwork
Abutment side of adjacent formwork
No large gap is formed between them.

According to the sheet for formwork of the second aspect, the side edge portion on which the projection or the ridge is not formed is wrapped around the side surface of the formwork and is attached to the surface of the formwork. One concrete casting form can be easily manufactured.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a concrete casting formwork and a formwork sheet of the present invention, FIGS. 2 and 3 are perspective views showing an embodiment of a formwork sheet of the present invention, FIG. 4 is a cross-sectional view showing a state where the concrete casting formwork shown in FIG. 1 is arranged in parallel.

A concrete casting form 20 shown in FIG.
The mold sheet 21 of claim 2 is attached so as to cover the mold surface and both side surfaces of the mold body 22.
The protrusions 21 a of the form sheet 21 are provided on portions other than the side edge portions 21 b of the soft sheet 21 so as to be disposed only on the mold surface of the form 22.

Such a concrete casting form 20
As shown in FIG. 4, when a plurality of molds are arranged in parallel, the gap between adjacent molds 20 is closely adhered by a sealing portion 23 of a soft sheet of a mold sheet 21 to effectively prevent leakage of uncured concrete. Is done.

In the present invention, there are no particular restrictions on the shape and size of the projections and ridges of the flexible sheet (sheet for formwork), the number of projections per unit area, the arrangement pattern, and the like, and the adhesive strength with the mortar. Is selected appropriately so as to obtain a sufficient value. For example, there are a rubber sheet 24 in which protrusions 24a shown in FIG. 2 are arranged vertically and horizontally, a resin sheet 25 having a ridge 25a shown in FIG. 3, and the like.

The projections or ridges of the soft sheet may be hollow or solid, or may be porous having many independent pores. Therefore, as a soft sheet,
A foam sheet having hollow projections can also be used.
The projections and ridges may have a tapered flat shape from the beginning (that is, even if no concrete side pressure is applied).
Further, the projections and the ridges may not be deformed to a large thickness.

The width of the side edge portion of the soft sheet where no projection or ridge is formed is appropriately determined according to the mold used.

The method for attaching such a soft sheet (sheet for formwork) to the formwork is not particularly limited, and various methods such as a method using a tucker or a double-sided tape can be adopted.

In the example shown in the drawings, the side face of the form is covered with a soft sheet (form sheet). However, the form for concrete casting according to the present invention is only one side of the form. Can be sealed even if covered with a soft sheet. Accordingly, the formwork sheet of the present invention may be provided with projections or ridges except for one side edge portion.

In the present invention, the side edges of the sheet may be made thicker or made of a hard material. In this way, the side edge of the sheet can be fitted exactly to the side surface of the mold.

[0024]

As described above in detail, according to the concrete casting formwork and the formwork sheet of the present invention, excellent sealing properties can be obtained between the side faces of the formwork arranged in parallel, and leakage of uncured concrete can be achieved. Thus, a concrete wall having an uneven surface can be easily and reliably formed. Since the formed concrete wall has a strong adhesive force to the mortar and a sufficiently high joining strength can be obtained, it is extremely suitable as a wall surface to be tiled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a concrete casting formwork of the present invention.

FIG. 2 is a perspective view showing an embodiment of the form sheet of the present invention.

FIG. 3 is a perspective view showing another embodiment of the form sheet of the present invention.

FIG. 4 is a cross-sectional view showing a state in which the concrete casting forms shown in FIG. 1 are arranged in parallel.

FIG. 5 is a sectional view showing one embodiment of a concrete casting method according to the prior application.

FIG. 6 is a sectional view showing an embodiment of a concrete casting method according to the prior application.

FIG. 7 is a sectional view showing an embodiment of a concrete casting method according to the prior application.

FIG. 8 is a sectional view showing an embodiment of a concrete casting method according to the prior application.

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

FIG. 10 is a sectional view showing a tiling method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Formwork 11 Soft sheet 11a Projection or ridge 12 Unhardened concrete 13 Concrete wall 13a Depression 14 Mortar 20 Concrete casting formwork 21 Formwork sheet 21a Projection 22 Formwork body 23 Seal part

Claims (2)

(57) [Claims] 1. A concrete設用formwork non absorbent soft sheet having projections or ridges are attached to the mold surface to the surface, side edges of the soft quality sheet are wraps around to the side of the mold , The protrusion or ridge is one of the soft sheets
A concrete casting formwork provided on a portion of the surface other than the side edge portion . 2. A non-water-absorbing soft sheet having a projection or a ridge provided on one surface attached to a mold surface of a concrete casting mold, wherein the projection or the ridge is a side edge portion of the soft sheet. A sheet for a formwork, wherein the sheet is provided in a portion other than the above.