JPH10146819A - Embedding material of concrete slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix to the base plate part of a concrete by means of a simple structure by a method wherein this embedding material is made of a platen-like synthetic resin foamed molded article, at the side walls of which respective inclined surfaces divergent from the top surface to the base plate side bottom surface of the platen are provided so as to embed its peripheral low end parts in a concrete base plate in order to be temporarily fixed through hardening. SOLUTION: As a means for temporarily fixing an embedding material 1 to the base plate part 30 of a concrete, its four side walls 16 are composed of inclined surfaces, each of which is divergent from its top surface 18 to the bottom surface 17 side of the base plate part 30. A sure temporarily fixing can be realized by expandingly immersing the divergent peripheral edge lower end part of the embedding material 1 into the base plate part 30 of the concrete through hardening. Concretely, since the side walls become narrower towards their upper part, by pressing the embedding material 1 in the base plate part 30, which is not yet hardened, of the concrete, the base plate part 30 of the concrete and the peripheral edge low end part of the embedding material 1 come into inclinedely contact with each other, resulting in allowing to surely prevent the embedding material 1 from falling off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding made of synthetic resin, which is temporarily fixed to a substrate constituting a lower layer of a reinforced concrete slab and finally enclosed therein for the purpose of reducing the weight of the reinforced concrete slab. It is about materials.

[0002]

2. Description of the Related Art In recent years, with the rise of buildings, reinforced concrete slabs have been used for flooring and ceiling materials of buildings for the purpose of reducing the weight of buildings, commercializing building materials, and reducing transportation costs. I have. With respect to this concrete slab, an embedding material made of a foamed resin molded article has been recently filled in the slab for the purpose of increasing strength, reducing weight, and improving sound insulation.

[0003] Such a reinforced concrete slab S is
It is common to construct through the steps shown in FIGS. 8A to 8C. 1. Reinforcing bars 20 are arranged in the formwork 10, concrete serving as the base 30 of the concrete slab serving as the lower layer of the slab is poured, and the concrete in the formwork 10 is uniformly filled by vibrating up, down, front, back, left and right by a vibrator (not shown). Process. 2. Before the substrate portion 30 of the concrete slab is cured, a step of arranging and temporarily fixing the embedding materials 1 made of a foamed resin molded product at appropriate intervals (FIG. 8A). 3. The steam is sent into the mold 10 to be at normal pressure and high temperature (80
(° C. to 90 ° C.) for several hours to cure the concrete substrate portion 30 quickly. This step may be heating curing by an oven or hot-air curing by a hot-blast stove. 4. The hardened concrete board part 30 is carried into the building site from the factory, the surroundings of the board part 30 with the embedding material 1 are surrounded by another formwork 10, and the rebar 21 on the upper side is arranged. Post-cast concrete 4 to be the upper layer
0, the embedding material 1 is embedded in the concrete slab, and is hardened to complete the reinforced concrete slab S (FIG. 8c).

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 59-2286
As clearly shown in Japanese Patent Publication No. 2, the adhesive strength between concrete and a foamed resin molded product is poor, and the foamed resin molded product is used as a mold for a concrete product. Since the embedding material 1 made of a foamed resin molded product is ultimately embedded in the reinforced concrete slab S, it can be said that the problem is a method of temporarily fixing the embedding material 1 to the substrate portion 30 of the lower concrete slab.

[0005] At present, a method widely used is disclosed in
This is a technique disclosed in Japanese Patent No. 47008, in which an embedding material formed of a foamed resin molded product is fixed to a substrate portion of a concrete slab before being hardened by various locking tools. Although it is reliable to stop the embedding material with the locking tool in this way, it is extremely complicated and troublesome to stop a large number of embedding materials on the substrate part of the concrete slab. The use of a fastener and its management became necessary.

In the embedding material disclosed in Japanese Patent Publication No. 58-20768, a concave portion such as a groove or a concave portion is formed in at least a part of the peripheral side surface, and a part of the mortar dango is inserted into the concave portion. A means is shown in which a lever mortar dango is placed over a substrate portion and an embedding material is attached and fixed. However, it is difficult to increase the working efficiency because the mortar dango is applied so as to straddle the concave portions of a large number of embedding materials and the substrate portion so as to be applied manually.

In the means disclosed in the mounting method of Japanese Patent Application Laid-Open No. Hei 4-216010, a through hole is formed in the embedding material so that the uncured concrete of the substrate portion flows into one opening of the through hole. Are fixed and fixed by curing. However, if a through hole communicating with the internal space is provided, the post-cast concrete enters the inside from the through hole, and the meaning of providing the space in the embedding material is lost. The use of two or more through-holes with different penetration directions is recognized to be effective. In other words, the production is troublesome and the cost is high, and the product has not actually been supplied.

In general, when the embedding material has a solid rectangular parallelepiped shape having a wide joint surface with the substrate portion, drying for curing cannot be performed uniformly, and concrete and embedding materials are not provided. In order to save money, a plurality of spaces having openings formed on the lower end side are provided. Since the reinforced concrete slab has a large area, an operator has to walk on the already installed embedding material to arrange the embedding material in the central portion. Therefore, it has been proposed not only to provide a large number of reinforcing ribs inside the box, but also to put a wire mesh inside the embedding material or to join a pressure-resistant plate on the upper surface side to reinforce it. (JP-B-57-47007, page 3, lines 5 to 10). Probably because of the increase in unit price when the reinforcing means is separately provided, the reinforcing means is not provided in the actual product.
For this reason, the embedded material of the foamed resin molded product may be broken by an operator stepping on it.

[0009]

The present invention has been developed by the inventor as a result of intensive studies to solve the above-mentioned problems. The gist of the invention of claim 1 is that, before the substrate portion of the concrete slab is still hardened, it is disposed on the surface of the substrate portion and temporarily fixed, and finally poured into the slab by pouring the slab concrete. A burying material to be buried, characterized in that it is made of a disc-shaped synthetic resin foam molded product in which each of the four side walls is formed with an inclined surface which is flared from the upper surface toward the bottom surface on the substrate side. It is.

The invention of claim 2 is characterized in that the inclination of the side wall inclined surface is 3 ° or more with respect to the vertical surface. Further, the invention of claim 3 is characterized in that, in the above-mentioned invention, only the bottom side of each side wall is flared and inclined. According to a fourth aspect of the present invention, in the above-mentioned invention, a regular rib and a columnar reinforcing wall are provided on the bottom side to form a box.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings showing an embodiment of the present invention. FIG. 1 is a perspective view of the embedding material 1 according to the present invention as viewed from the back surface. FIGS. 2 and 3 are cross-sectional views of essential parts in use, FIG. 4 is a plan view, FIG. 5 is a rear view, and FIG. 5 is a sectional view taken along the line AA, and FIG. 7 is a sectional view taken along the line BB of FIG.

The embedding material 1 is made of a disc-shaped foamed article made of synthetic resin, and is formed of closed-cell polyethylene, polypropylene, a polyethylene / polystyrene composite resin, an acrylonitrile / styrene copolymer, or the like. Although it may be solid, it is desirable to have a box shape with a large number of spaces 11 provided on the bottom side in order to save the embedding material 1 and concrete material.

Further, the bottom surface 1 is used to dissipate the heat of hydration accompanying the hardening of the concrete and to discharge moisture (breathing) that seeps into the upper surface of the substrate 30 of the concrete slab.
The recesses 12 and 12 communicating with the outside are provided on the peripheral edge of the bottom surface when the 7 is disposed on the concrete substrate portion 30, and the recesses 13 communicating with the recesses 12 and 12 are provided from the bottom surface 17 side of all the spaces 11. To do. The depths of the concave portions 12 and 13 are set to about 20 cm. Even when the concave portions 12 and 13 are embedded in the concrete substrate portion 30, 5 to 10 cm are exposed so that the space 11 communicates with the outside.

The space 11 of the embedding material 1 shown in the drawing has a rectangular space 11 formed by reinforcing ribs 14 formed vertically and horizontally, and a columnar reinforcing wall 15 is provided at a position near a short side and a central portion. It is formed so as to be provided. Also, rib 1
The inner cross-shaped part 4 is made thicker, and the central part is reinforced without providing the concave part 13 in the longitudinal rib 14.

As means for temporarily fixing the embedding material 1 to the concrete substrate portion 30, the four side walls 16 are each formed of an inclined surface that expands from the upper surface 18 toward the bottom surface 17 of the substrate portion 30. The lower end of the peripheral edge of the embedding material 1 spreads into the base 30 of the concrete and spreads into the concrete base portion 30 so that the embedding material 1 can be temporarily fixed without fail by hardening. That is, if the side wall 16 is perpendicular to the bottom surface 17, it will be barely held in the horizontal direction. However, as described above, the embedding material 1 and the concrete do not adhere to each other, so that they are easily removed. It will end up. However, in other words, since the side wall 16 is narrowed toward the upper part, when the embedding material 1 is pushed into the uncured concrete substrate portion 30, the concrete substrate portion 30 and the peripheral lower end portion of the embedding material 1 are pressed. Are inclined and come into contact with each other, so that the embedded material 1 can be reliably prevented from falling off (FIG. 2).
reference).

As shown in FIG. 2, the inclined surface (α
In the case of (°), if the angle is 3 ° or more with respect to the vertical, the embedding material 1 can be sufficiently temporarily fixed securely. When the inclination is less than 3 ° and becomes almost vertical, the embedded material 1 may fall off.

Although the detailed illustration is omitted, the embedding material 1 is not adhered to the concrete substrate portion 30 but is bonded to each other, but by the inclined surfaces to be joined. The inclined surface may be formed only at a portion near the bottom surface.

Since the embedding material 1 is provided with the reinforcing ribs 14 formed vertically and horizontally inside and the reinforcing wall 15 in the form of a column, the embedding material 1 walks up when the work of arranging the concrete on the substrate part 30 is performed. But they never step on.

The embedding material 1 having the above-described structure is to be embedded in a reinforced concrete slab S shown in FIG. Since it is stopped, a detailed description of the steps to be constructed is omitted.

[0020]

As described above, the embedding material according to the present invention is made of a disc-shaped synthetic resin foam molded article, and has an inclined surface on the side wall which extends from the upper surface toward the bottom surface on the substrate side. It was constructed so that the lower edge of the periphery was buried in the concrete substrate and hardened and temporarily fixed, so that the structure was extremely simple compared to the conventional temporary fixing means, and the concrete substrate could be securely fixed to the substrate portion. .

If the slope of the side wall is 3 ° or more with respect to the vertical, the side wall close to the bottom is covered with the hardened concrete substrate and held. The inclined surface may be formed only on the side wall close to the bottom surface, which is the portion to be embedded in the concrete substrate portion of the embedding material.

If the embedding material is formed in a box shape having regular ribs and a cylindrical reinforcing wall on the bottom side, the material of concrete and foam resin can be saved, and the material can be reinforced freely. Even if a person gets on the vehicle, it will not be stepped on or damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embedding material according to the present invention as viewed from the back surface.

FIG. 2 is a perspective view of a use state.

FIG. 3 is a perspective view of a use state.

FIG. 4 is a plan view of an embedding material.

FIG. 5 is a rear view of the embedding material.

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a sectional view taken along line BB of FIG. 5;

FIG. 8 is a cross-sectional view showing a method of applying an embedding material.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 embedded material 11 space 12 concave portion 13 concave portion 14 rib 15 reinforcing wall 16 side wall 17 bottom surface 18 top surface 10 formwork 20 reinforcing bar 21 reinforcing bar 30 substrate portion 40 post-cast concrete

Claims (4)

[Claims] 1. A buried material which is disposed on the surface of a concrete slab and temporarily fixed before the substrate of the concrete slab is still hardened, and is finally buried in the slab by pouring the slab concrete. An embedding material for a concrete slab, characterized in that the embedding material is a disc-shaped synthetic resin foam molded product in which each of the four side walls is formed with an inclined surface that expands from the upper surface toward the bottom surface on the substrate side. 2. The embedding material according to claim 1, wherein the inclination of the side wall inclined surface is 3 ° or more with respect to a vertical surface. 3. The embedding material according to claim 1, wherein only the bottom surface of each side wall is flared and inclined. 4. A box-like structure having a regular rib on the bottom surface and a reinforcing wall on a cylinder.
The embedding material according to claim 2 or 3.