JPH07158201A - Base for hollow concrete slab - Google Patents

Abstract

PURPOSE:To improve the drainage of moisture in post-cast concrete. CONSTITUTION:A box-shaped imbedded member 4 which is formed of a synthetic resin foamed part and has a hollow part having an opened lower face is connectedly fixed to a concrete base 3 through a locking tool 5 during the curing process of the concrete base 3 having not hardened yet. The imbedded member 4 has an upper face inclining roof-shapedly, and is provided with an opened hole 7 to make the hollow part of the imbedded member communicate with the outside. Since the drainage of moisture in post-cast concrete is excellent, even if the concrete is post-cast in a cold area, an inferior curing is not caused by the freezing of staying water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate for hollow concrete slabs, and more particularly, to improve the drainage of water in post-cast concrete in the process for producing a substrate for hollow concrete slabs, and also during the production process and the completion of finished products The present invention relates to a substrate for hollow concrete slabs having an effective structure for discharging moisture accumulated in an internal space surrounded by an embedding material and a concrete substrate later.

[0002]

2. Description of the Related Art As a construction method for a concrete slab constructed as a floor material or ceiling material for a building, the material is made hollow or a light embedding material is embedded inside the concrete for the purpose of reducing the weight and improving the sound insulation effect. It is generally widely known that they are used in a complicated manner. However, such a construction method has drawbacks that it requires labor to manufacture the hollow portion and that mounting of the embedding material is not easy.

Conventionally, as a method of solving these problems, as disclosed in Japanese Patent Publication No. 57-47008,
An embedding material consisting of a synthetic resin foam molded product is placed during the curing process in which the concrete substrate is uncured, and the embedding material is fixed to the concrete substrate using a locking tool, and the embedding material is solidified by the concrete substrate. It has been proposed to connect and fix the to the concrete substrate. FIG. 11 schematically shows such a conventional substrate structure for hollow concrete slabs.

In FIG. 11, in order to assemble a substrate for a hollow concrete slab, first, a grid-like reinforcing bar 02 having truss reinforcing bars 01 fixed thereto is set on a mounting table (not shown) and surrounded by the reinforcing bars 02. The concrete substrate 03 is molded by casting the kneaded concrete in the frame. Next, while the concrete substrate 03 is uncured, a box-shaped embedding material 04, which is a synthetic resin foam-molded product and has a hollow portion with an opened lower surface, is placed at a predetermined position, and a locking tool 05 is used. Then, the embedding material 04 is fixed to the concrete substrate 03. In this way, the hollow portion 06 surrounded by the embedding material 04 and the concrete substrate 03 is formed. Then, the concrete is hardened through the steam curing process, and the embedding material 04 is firmly integrated with the concrete substrate 03. The thus-prepared hollow concrete slab substrate is carried into the site and set at a predetermined position, the slab top bar is reinforced, and in-situ concrete is poured to complete the process.

With such a structure and manufacturing method, the concrete substrate 03 and the embedding material 04 can be integrated and transported, and the transportation cost of the embedding material 04 can be saved. Further, the embedding material 04 does not rise when the post-cast concrete is poured, and the hollow portion is reliably formed at a predetermined position.

[0006]

However, in the above-mentioned conventional substrate for hollow concrete slab, the water in the post-cast concrete is slowly drained, and the retained water may freeze and cause curing failure especially in cold regions. . Further, the amount of the frozen and increased volume may push up the concrete, and the upper surface of the embedding material 04 may rise. The concrete thus hardened cannot express a predetermined strength and cannot be used.

Further, during the steam curing process at the time of manufacturing the substrate for hollow concrete slab, the steam is confined in the hollow portion 06 surrounded by the embedding material 04 and the concrete substrate 03, and this steam is generated even after the steam curing process is completed. Water droplets remained and delayed the drying of the portion where the embedding material 04 was installed. During the steam curing process, the embedding material 04 may be deformed by the heat of steam inside the hollow portion 06. When the substrate in which the water content is confined in the hollow portion 06 is mounted on the site as it is, the concrete substrate 03 may be deformed or cracked after the construction.

The present invention has been made in view of the above problems, and an object thereof is to improve water handling in post-cast concrete and to rapidly dry a substrate for hollow concrete slab in a steam curing step. It is an object of the present invention to provide a substrate for hollow concrete slabs that can be deformed and destroyed during the steam curing process and after construction on site.

[0009]

In order to solve the above-mentioned problems, the present invention provides a box-shaped embedding material which is made of a synthetic resin foam-molded product and has a hollow portion whose lower surface is opened, in which a concrete substrate is not used. During the curing process of hardening, in the hollow concrete slab substrate that is connected and fixed to the concrete substrate using a locking tool, the upper surface of the embedding material is inclined like a roof, and the hollow portion of the embedding material is It is characterized in that an opening is formed for communicating with the outside.

The opening may be an opening formed in the vicinity of a position where the side surface of the embedding material comes into contact with the concrete substrate, the opening being tapered toward the outside. There may be at least one through hole formed at a position located in the open hollow surface,
Both may be used.

[0011]

[Operation] In the substrate for hollow concrete slabs according to the present invention, since the upper surface of the embedding material is inclined like a roof, the moisture in the post-cast concrete is pulled out quickly, and the moisture stays even in cold regions. It never freezes. In addition, during the steam curing process at the time of manufacturing the substrate for the hollow concrete slab or during the sprinkling of water before the post-casting concrete is placed, the water trapped in the hollow portion surrounded by the embedding material and the concrete substrate is an open hole, that is, drainage. It is discharged to the outside through the holes. Since this discharge hole formed in the side wall of the embedding material is tapered toward the outside, water in the hollow portion of the embedding material is easily discharged, and conversely, moisture from the outside is unlikely to enter. In addition, this opening formed in the concrete substrate can effectively remove the water that has entered the hollow portion due to some reason during sprinkling of water before the post-casting concrete is poured during or after the on-site construction.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is an overall perspective view of an embodiment of a hollow concrete slab substrate according to the present invention, and FIG. 2 is a line II-II of FIG.
A line sectional view, FIG. 3 is a front perspective view of the embedding material, FIG. 4 is a rear perspective view of the embedding material, and FIG. 5 is a plan view of the back surface of the embedding material.

As is apparent from FIG. 2, this hollow concrete slab substrate is basically constructed in the same manner as the conventional one. That is, the hollow concrete slab substrate C is an embedding material 4 made of a synthetic resin foam-molded product having a truss bar 1, a reinforcing bar 2, a concrete substrate 3, and a hollow portion whose upper surface inclines like a roof and opens downward. , And the locking member 5, and the embedding material 4 is embedded in the surface of the concrete substrate 3 through the truss bars 1 and the reinforcing bars 2 and the locking tool 5.

In order to assemble the substrate C for the hollow concrete slab, first, a grid-shaped reinforcing bar 2 having truss reinforcing bars 1 fixed thereto is set on a mounting table (described later) and surrounded by the reinforcing bars 2. The concrete substrate 3 is molded by placing concrete that has been kneaded in advance in the frame.
Next, while the concrete substrate 3 is uncured, a box-shaped embedding material 4 made of a synthetic resin foam-molded product whose upper surface is inclined like a roof and whose lower surface is opened is arranged at a predetermined position, and a locking tool is provided. The embedding material 4 is fixed to the concrete substrate 3 by using 5. In this way, the hollow portion 6 surrounded by the embedding material 4 and the concrete substrate 3 is formed. Then, the concrete is hardened through the steam curing process, and the embedding material 4 is firmly integrated with the concrete substrate 3.

As shown in FIGS. 3 to 5, the embedding material 4 is molded from a synthetic resin foam-molded product, and has an overall box-like shape having a hollow portion whose upper surface is inclined like a roof and whose lower surface is open. Is made. Lattice-shaped inner leg portions 41 are provided inside the hollow of the embedding material 4 to provide strength. Further, a cutout 10 is formed on a side portion of the embedding material 4 for recessing a locking tool 5 used for attaching the embedding material 4 to the concrete base material 3.

A drain hole 7 for communicating the hollow portion 6 formed inside the embedding material 4 and the outside is provided at the lower end of the side surface of the embedding material 4 (in the vicinity of the position where it abuts on the concrete substrate 3). There is. The drainage hole 7 is preferably formed in a tapered shape as a whole to the outside, and may have a maze structure as shown in the drawing. After the substrate C for hollow concrete slab integrally formed in this way is carried into the site and set at a predetermined position, the slab upper end streak (not shown) is laid and post-cast concrete is placed to complete. . And
In order to improve the adhesion between the concrete slab substrate C and the post-cast concrete during construction at this site, or to prevent the strength of the post-cast concrete due to water absorption of the concrete substrate 3 and to prevent cracking due to drying shrinkage. Water is sprinkled on 3.

Next, the function of the hollow concrete slab substrate C thus constructed will be described. Since the conventional embedding material 04 shown in FIG. 11 has a flat upper surface,
As shown in FIG. 6 (a), the drainage is slow above the embedding material,
Moisture in the post-cast concrete 20 tends to stay. For this reason, when the construction is performed in a cold region, the accumulated water may be frozen to cause a problem such as curing failure.

On the other hand, in the embedding material 4 according to the present invention, since the upper surface of the embedding material is inclined like a roof, as shown by an arrow in FIG. It is quickly discharged along the roof-like slope, and it does not cause problems such as freezing and poor curing even during construction in cold regions. Also, the water trapped in the hollow portion 6 surrounded by the embedding material 4 and the concrete substrate 3 during the steam curing step during the production of the hollow concrete slab substrate C or in the sprinkling water before the post-casting concrete placement. Is discharged to the outside through the drain hole 7. Since the discharge hole 7 has a tapered shape with respect to the outside, water in the hollow portion 6 of the embedding material 4 is easily discharged, and conversely, water from the outside is less likely to enter.

At the lower end of the side surface of the embedding material 4, a drainage hole 7 for communicating the hollow portion 6 formed inside the embedding material 4 with the outside.
As a result, the contact area between the embedding material 4 and the concrete substrate 3 is reduced. Therefore, when the upper concrete receives an impact, the impact transmitted through the embedding material 4 is reduced, and the floor sound insulation characteristics are improved.

[Embodiment 2] Next, referring to FIGS. 7 to 10, an embodiment of a hollow slab concrete substrate in which an upper portion is inclined like a roof and a through hole (drain hole) is formed in a concrete substrate portion is manufactured. Will be explained together.
7 and 8 are cross-sectional views of main parts in the manufacturing process, FIG. 9 is a cross-sectional view of main parts of a finished product of the hollow concrete slab base material C, and FIG. 10 is a cross-sectional view taken along line IX-IX of FIG. Also in this manufacturing method, the manufacturing method is basically the same as that of the above-described embodiment. Therefore, in the description of this embodiment, the components corresponding to the components of the above embodiment are
The same reference numerals as those in the above-mentioned embodiment are attached and the duplicated description is omitted.

In manufacturing the hollow concrete slab base material C of this embodiment, first, as shown in FIGS. 7 and 8, a reinforcing bar in which truss bars 1 are preliminarily fixed on a mounting table 8 preferably made of steel. After assembling 2, the kneaded concrete is poured into the frame of the assembled rebar 2 to mold the concrete substrate 3 (FIG. 7). Next, while the concrete substrate 3 is uncured, the embedding material 4 made of a synthetic resin molded product is placed at a predetermined position, and the embedding material 4 is attached to the concrete substrate 3 using the fasteners 5. Fix it. The embedding material 4 has substantially the same shape as that used in the embodiment of the first invention. That is, the embedding material 4 has a box-like shape with an opening on the lower surface as a whole, and the inner leg portions 41 having a lattice shape are integrally formed inside the hollow. Further, as shown in the figure, the inner leg portion 41 is formed with a communication hole 11 for communicating the hollow portions 6, 6 with each other.

The concrete is hardened through the steam curing process, and the embedding material 4 is firmly integrated with the concrete substrate 3. The hollow concrete slab substrate C integrally formed in this way is carried into the site, set at a predetermined position, the upper end stirrup of the slab (not shown) is arranged, and post-casting concrete is placed to complete. To do. As shown in the figure, an appropriate number of rods 9 longer than the thickness of the concrete substrate 3 are integrally formed on the mounting table 8 in the present invention in the vertical direction. Therefore, when the hollow concrete slab substrate C is removed from the mounting table 8, a drain hole 10 is formed which penetrates the concrete substrate 3 and communicates the hollow portion 6 of the embedding material 4 with the outside. After the construction on site, the drain hole 10 is closed with a decorative material such as a wall material, a floor material, or a ceiling material, if necessary.

Since the hollow concrete slab substrate C manufactured in this manner has the drain holes 10 formed through the concrete substrate 3, it can be sprayed during the steam curing step or before the sprinkling of the post-cast concrete. The water trapped in the hollow portion 6 surrounded by the embedding material 4 and the concrete substrate 3 is discharged to the outside through the drain hole 10. At this time, the inner leg portion 41 of the embedding material 4 is provided with the communication holes 11 for communicating the hollow parts 6, 6 with each other, so that all the hollow parts 6 are communicated by the communication holes 11. Therefore, the water trapped in the hollow portion 6 can freely move back and forth between the hollow portions 6 and 6, and the probability of being discharged from the drain hole 10 is increased accordingly.

[Embodiment 3] FIG. 12 is a perspective view showing another embodiment of the embedding material. The embedding material of this embodiment is formed of a synthetic resin foam-molded product like the embedding material described in the above embodiments, and has a box-like shape with a hollow portion opened on the lower surface. It has a grid-shaped inner leg inside the hollow, a cutout for recessing the locking tool in the periphery, and a drain hole for communicating the hollow portion formed inside the embedding material with the outside. The points and the like are the same as those in the above-mentioned embodiment. However, what is different from the above-mentioned embodiment is that the roof-like inclined upper surface is corrugated. Even when the embedding material of this embodiment is used, the same effect as that of the above-mentioned embodiment can be obtained.

[Modification] Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various small designs can be made without departing from the scope of the claims. It is possible to make changes. For example, the roof-like slope does not necessarily have to be provided symmetrically, and the slope direction may be four directions instead of two directions. In the first embodiment, it is possible to provide the inner leg portion 41 of the embedding material 4 with a communication hole for communicating the hollow portions 6 with each other, and in that case, the number of drainage holes 7 can be appropriately reduced. Is. Further, in the second embodiment, instead of providing the communication holes 11 for communicating all the hollow portions 6, the communication holes 11 for communicating only the plurality of hollow portions 6 are provided, and at least one of the hollow portions 6 is provided. The drain hole 10 may be provided.

Furthermore, it is also possible to provide both holes formed in the embedding material and holes formed in the concrete base material as drainage holes in one hollow concrete slab base material. The shape and size of the hole are not limited to those shown in the figures, and can be appropriately selected according to the use environment. Further, it will be easily understood that the opening formed in the embedding material does not necessarily have to be a tapered opening to the outside.

[0027]

EFFECTS OF THE INVENTION According to the present invention, the water content of the post-cast concrete is improved, so that even in cold regions, curing failure and floating of the embedding material due to freezing do not occur. Further, the water accumulated in the hollow internal space surrounded by the embedding material and the concrete substrate can be easily discharged, and the substrate for the hollow concrete slab can be quickly dried in the steam curing step. And, it is possible to prevent the deformation and crack occurrence of the substrate for the hollow concrete slab after the steam curing process and the finished product construction at the site,
It is possible to improve the stable quality of products.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a substrate for hollow concrete slab according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front perspective view of the embedding material according to the first embodiment.

4 is a rear perspective view of the embedding material of FIG. 3. FIG.

5 is a plan view of the back surface of the embedding material of FIG. 3. FIG.

FIG. 6 is a diagram for explaining the operation of the present invention.

FIG. 7 is a cross-sectional view of essential parts in a manufacturing process of a substrate for hollow concrete slabs according to a second embodiment.

FIG. 8 is a sectional view of an essential part with an embedding material attached.

FIG. 9 is a cross-sectional view of essential parts of a completed hollow concrete slab substrate.

10 is a sectional view taken along line IX-IX in FIG.

FIG. 11 is a schematic view of a conventional hollow concrete substrate.

FIG. 12 is a perspective view showing another embodiment of the embedding material.

[Explanation of symbols]

C ... Substrate for hollow concrete slab, 3 ... Concrete substrate, 4 ... Embedding material, 5 ... Locking tool, 7 ... Drainage hole, 8 ... Steel mounting table, 9 ... Bar material, 11 ... Communication hole

Claims (4)

[Claims] 1. A box-shaped embedding material made of a synthetic resin foam-molded product and having a hollow portion with an opened lower surface is attached to the concrete substrate by using a fastener during a curing process in which the concrete substrate is uncured. In the connected and fixed hollow concrete slab substrate, the embedding material has an upper surface inclined like a roof, and an opening for communicating the hollow portion of the embedding material to the outside is formed. Substrate for hollow concrete slabs. 2. The substrate for hollow concrete slab according to claim 1, wherein the opening is formed in a side surface of the embedding material in a vicinity of a position where the opening comes into contact with the concrete substrate. 3. The hollow according to claim 2, wherein the opening is a taper-shaped opening formed on a side surface of the embedding material in the vicinity of a position where it abuts on the concrete substrate. Substrate for the continuous slab. 4. The through hole according to claim 1, wherein the opening is at least one through hole formed in the concrete substrate at a position located inside the hollow surface of the embedding material. Substrate for hollow concrete slab.