JP2000328781A - Sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a concrete building frame having projecting and recessed surface of high grade by providing a projecting and recessed part on the surface part of a placed concrete side, and securing water permeability in the direction of thickness and in the direction intersecting perpendicularly to the thickness direction. SOLUTION: A sheet material 10 is formed by projections 12 provided in parallel and at a designated space to a sheet base 11 on the concrete placing surface side (front part 11a) of the sheet base 11 and a projecting part is formed. The sheet base 11 is a rectangular membrane material, and in the inside of the base, a layer-like water passing space part 11c which permits surplus water discharged from a bed concrete building frame to permeate is formed in the direction intersecting perpendicularly to the direction of thickness, that is, along the membrane layer. Accordingly, surplus water in the concrete can be discharged early immediately after concrete is placed so as to construct a concrete building frame of high grade by a unit water reducing effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material to be stuck inside a form when a concrete frame having an uneven surface is constructed using the form.

[0002]

2. Description of the Related Art In a concrete structure, there are many cases of constructing a concrete body having an uneven surface on its surface. In such a case, the concrete foundation skeleton (hereinafter referred to as the “prime concrete skeleton”)
The following describes an example in which the construction is performed.

Heretofore, the following crimping method has been used as a method of attaching a plate-like tile to the surface of a foundation concrete body. That is, a plurality of ridges are formed in parallel on the surface of the foundation concrete skeleton so as to form an uneven surface, mortar is injected into a portion other than the ridge, and a plurality of tiles are arranged in this portion and bonded. The pasting method was used. To form a plurality of ridges on the foundation concrete skeleton, assembling a formwork in which a sheet material having ridges and grooves arranged at predetermined intervals is attached to the inner wall portion,
This has been done by placing concrete inside the formwork.

[0004]

However, since the conventional sheet material is formed of a water-impermeable material, it is impossible to discharge surplus water contained in the concrete cast in the formwork. However, it has been difficult to construct a foundation concrete skeleton having a predetermined strength. In addition, since the sheet material peels off due to environmental factors such as mold release and wind, it was difficult to stick the sheet material to the surface of the base concrete frame until a sufficient curing period was secured. . Also, even if the sheet material can be pasted, it often peels off halfway at each corner of the foundation concrete frame, and in that case, the appearance is poor, so the entire sheet material Was to be peeled off.

[0005] In order to construct a high quality foundation concrete skeleton, it is necessary to sufficiently perform initial curing. However, if the initial curing is insufficient, the surface of the underlying concrete body is exposed to a dry state before the underlying concrete body develops sufficient strength, which has a significant adverse effect on quality and causes cracks, etc. Becomes Therefore, if the sheet material is peeled off at an early stage, the surface portion of the foundation concrete skeleton is exposed to a dry state, so that the initial curing is not sufficiently performed, and the development of the strength of the concrete is suppressed. In addition, in the case of the concrete skeleton in which the concave and convex portions are formed by the sheet material, the area of the surface portion is large, and the evaporation of moisture from the portion is large, which is particularly inconvenient. Therefore, when the conventional sheet material is used, the various problems described above are compounded, and the quality of the concrete is significantly impaired, so that the adhesiveness of the tile to the completed foundation concrete skeleton deteriorates, Eventually, it could cause a tile peeling accident.

The present invention has been made to solve each of the above-mentioned drawbacks.
It is an object of the present invention to provide a sheet material that contributes to constructing a concrete skeleton having a high-quality uneven surface.

[0007]

In short, the sheet material of the present invention is a sheet material which is used by being stuck inside a formwork at the time of concrete casting, and is applied to the surface of the concrete side to be cast. It is characterized by having an uneven portion and ensuring water permeability in a thickness direction and a direction orthogonal to the thickness direction.

[0008] Therefore, since the sheet material of the present invention has water permeability, it is possible to discharge surplus water inside the concrete immediately after the concrete is poured. A concrete skeleton having an uneven surface can be constructed. Therefore, even if the sheet material is peeled off at an early stage, the curing is effectively performed while the underlying concrete skeleton is being held by the formwork. The impact on quality can be minimized.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of Sheet Material 10 According to the Present Invention As shown in FIGS. 1 and 2, the sheet material 1 according to the present invention
Numeral 0 is composed of a sheet base 11 and ridges 12 which are provided in parallel at a predetermined interval on a concrete casting surface side (hereinafter referred to as "front part 11a") of the sheet base 11 to form a convex part. Have been. The sheet base 11 is a rectangular film material. Inside the sheet material, a layer is formed so that surplus water discharged from the foundation concrete body can pass through in a direction perpendicular to the thickness direction, that is, in a direction along the film layer. Is formed.

As described above, the ridges 12 protrude from the front surface 11a of the sheet base 11, and the ridges 12 and the concave grooves 13 are formed alternately. In the sheet substrate 11, a large number of fine holes 11d are provided at regular intervals.
It is provided so as to penetrate in the thickness direction, so that excess water discharged from the foundation concrete skeleton can be discharged to the outside. The sheet base 11 and the ridge 12 are formed of vinyl chloride and have elasticity and deformability.

The sheet member 10 comes into contact with the foundation concrete skeleton at the front surface 11a, and comes into contact with the weir plate 20 forming the formwork on the opposite surface (hereinafter referred to as the "back surface 11b"). Also, naturally, the sheet material 1
The standard of 0, the formation mode and the number of the ridges 12, etc. are determined according to the foundation concrete skeleton to be constructed. It should be noted that the formation of the irregularities on the surface of the foundation concrete skeleton is not limited to the case where the above-mentioned crimping method is applied, and enhances adhesion of mortar or the like used for bonding the tile and the foundation concrete skeleton. It may be formed to take on a role. In such a case, the shape of the uneven portion formed on the front surface portion 11a of the sheet material 10 is as follows.
The protrusions 12 and the concave grooves 13 need not be provided, and can be formed in an appropriate shape.

(2) Method for Using Sheet Material 10 According to the Present Invention Next, a method for using the sheet material 10 according to the present invention will be described.

First, the back surface portion 11b of the sheet material 10 is stuck to the concrete casting surface side of the weir plate 20 constituting the formwork with an adhesive or staples. Then, the crest plate 20 is raised upright (not shown) so as to have a predetermined shape.
And assemble the formwork.

Next, concrete is poured into the formwork,
Curing is performed until a predetermined strength is developed. At this time, surplus water existing near the surface of the foundation concrete body is discharged to the outside through the fine holes 11d formed in the sheet base 11 (see the leftward arrow in FIG. 2). Here, since the drainage holes 20a are also formed at predetermined intervals in the weir plate 20, surplus water can be easily discharged to the outside of the weir plate 20 through the drainage holes 20a. Also,
Part of the surplus water passes through the water passage space 11c formed inside the sheet material 10, and is discharged downward by gravity (see the downward arrow in FIG. 2). Therefore, it is possible to construct a high-quality foundation concrete skeleton by the effect of reducing the unit water amount.

Subsequently, after the foundation concrete frame reaches a predetermined strength, the mold is released from the mold while the sheet material 10 is held as it is. Then, after a predetermined curing period has elapsed, the sheet material 10 is peeled off from the surface of the foundation concrete skeleton, and the operation is completed. Here, even after the mold is removed from the mold, the sheet material 10 has elasticity and is sufficiently adhered to the surface of the foundation concrete skeleton, so that it is difficult to peel off. Also, even if the sheet material 10 is peeled off, the curing is effectively performed while the underlying concrete skeleton is held by the formwork, so that the quality of the underlying concrete skeleton is improved. Can be minimized.

Therefore, by using the sheet material 10 of the present invention, the initial curing is carried out in an ideal state, so that a high-quality concrete foundation body can be formed. Therefore, when a tile is stuck on the foundation concrete skeleton, the adhesiveness of the tile is good, and the peeling of the tile can be sufficiently prevented by the dovetail effect.

As described above, as an example of the preferred embodiment of the sheet material according to the present invention, the case where the foundation concrete skeleton is constructed has been described. However, the present invention is not limited to such a case, and it goes without saying that the present invention can be appropriately modified and implemented within the range of the above-described configuration even when another concrete skeleton is formed. In addition, there is no limitation on the material of the sheet material, the shape and number of the concave and convex portions formed on the surface of the sheet material, and a plurality of combinations of those materials and shapes.

[0019]

According to the present invention, since the sheet material has water permeability, the excess water inside the concrete can be discharged immediately after the concrete is poured.
A high quality concrete skeleton can be constructed by the effect of reducing the amount of water per unit.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sheet material according to the present invention.

FIG. 2 is an enlarged side sectional view of a main part of a sheet material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sheet material 11 Sheet base 11a Front part 11b Back part 11c Water-passing space part 11d Micro hole 12 Protrusion 13 Concave groove 20 Weir board 20a Drain hole

Claims (1)

[Claims] 1. A sheet material which is used by being stuck inside a formwork at the time of placing concrete, wherein the sheet material has an uneven portion on a surface side of a concrete side to be poured, and a thickness direction and the thickness. A sheet material having water permeability secured in a direction perpendicular to the direction.