JP2002146959A - Embedded member for hollow concrete slab, and base board for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embedded member for a hollow concrete slab and a base board for the same, which are for use in forming the concrete slab excellent in sound insulating properties. SOLUTION: The embedded member 1 for the hollow concrete slab is vertically divided into a plurality of pieces except for mounting-side second joint portions 6, upper side joint portions 7, etc. Further, the embedded member 1 for the hollow concrete slab thus constructed is rigidly mounted on a concrete base board 3, to thereby form the base board 2 for the hollow concrete slab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedding material for a hollow concrete slab formed of a foam molded article integrally formed of a synthetic resin, and a hollow concrete slab in which the embedding material is mounted and fixed on a concrete substrate. Regarding the substrate.

[0002]

2. Description of the Related Art In recent years, as flooring materials and ceiling materials for buildings,
Various substrates for hollow concrete slabs having a structure in which an embedding material made of a synthetic resin foam molded product is placed on a concrete substrate and the embedding material is fixed by a fastener are proposed and used.

[0003] Using such a substrate for hollow concrete slab, concrete is poured on site to construct the floor, ceiling and the like of the building, thereby constructing the floor and ceiling of the building. There is an advantage that labor saving and weight reduction can be achieved, and excellent sound insulation performance can be obtained.

The embedding material for a hollow concrete slab to be attached to the above-mentioned hollow concrete slab substrate has an opening on the lower surface, that is, a mounting surface to be mounted on the concrete substrate, for weight reduction and material saving. There is a structure having a hollow portion.

However, in a concrete slab using a hollow concrete slab substrate in which a hollow concrete slab embedding material having a structure having the above-mentioned hollow portion is fixed on a concrete substrate, the hollow portions are arranged at substantially equal intervals inside a span. Due to the existence, there is a problem that a resonance phenomenon occurs between the concrete placed on the upper side and the concrete substrate on the lower side, and the sound insulation performance at a specific frequency (about 1 KHz) is reduced. Was.

In order to improve this, a substrate for a hollow concrete slab as shown in FIG. 10 or FIG. 11 has been proposed (Japanese Patent Application Laid-Open No. 1-287369). That is, the hollow concrete slab substrate 51 is provided with a hollow portion 52 opened on the lower surface (mounting surface) and a plurality of through-holes 53 (hatched portions in the drawing) penetrating up and down and made of synthetic resin foam. An embedding material 54 made of a molded product is mounted and fixed on a concrete substrate 55.

As shown in FIG. 11, a hollow concrete slab substrate 51 having such a structure is cast in place into a through hole 53 provided in an embedding material 54 at the time of concrete casting, as shown in FIG. 56 will enter. Then, the cast-in-place concrete 56 that has entered the concrete substrate 55 on the lower side
When the surface reaches the surface of the concrete, the cast-in-place concrete 56 and the concrete substrate 55 are integrated, thereby suppressing the resonance phenomenon between the cast-in-place concrete 56 on the upper side and the concrete substrate 55 on the lower side. A reduction in the sound insulation performance of the slab 57 can be avoided.

[0008]

In the above-mentioned conventional concrete slab, the resonance phenomenon is suppressed as compared with a concrete slab using a concrete slab substrate on which an embedding material having no through hole is placed and fixed. Although the improvement in the sound insulation performance was recognized, the improvement in the sound insulation performance was slight. Also, the sound insulation performance of a solid concrete slab was far inferior.

The present invention has been made in view of the above circumstances, and has as its object to provide an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab for forming a concrete slab having excellent sound insulation performance. I do.

[0010]

SUMMARY OF THE INVENTION The present inventor has studied an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab. As a result, the concrete slab formed by the structure of the embedding material for a hollow concrete slab was obtained. Moving the natural frequency of the concrete to a higher frequency than before to make it difficult to transmit the vibration, and connecting concrete and the concrete board above and below the embedded material for hollow concrete slabs to increase the rigidity, the resonance phenomenon And found that a sound insulation performance close to that of a solid concrete slab was obtained, thereby completing the present invention.

[0011] That is, the embedding material for a hollow concrete slab according to the present invention, which has been made to solve the above-mentioned problems, comprises a foam molded article integrally formed of a synthetic resin and is mounted on a concrete substrate. An embedding material for a hollow concrete slab to be fixed, characterized in that it is divided into a plurality in the vertical direction perpendicular to the mounting surface with respect to the concrete substrate, while leaving one or two or more connection portions. .

According to a second aspect of the present invention, there is provided an embedding material for a hollow concrete slab according to the first aspect, wherein the embedding material for a hollow concrete slab is connected to the connecting portion having a continuous surface continuous with the mounting surface. At least one communication groove notched between edges of the continuous surface is formed.

According to a third aspect of the present invention, there is provided a substrate for hollow concrete slab according to the third aspect of the present invention, wherein the embedding material for a hollow concrete slab according to the first or second aspect is mounted on a concrete substrate. It is characterized by being fixed.

According to the first aspect of the present invention,
When a substrate for hollow concrete slab is formed using the embedding material for hollow concrete slab of the present invention, and concrete is cast on the substrate for hollow concrete slab, a concrete slab is formed. Concrete enters the plurality of divided portions of the filling material, and the poured concrete and the concrete substrate are integrated above and below the embedding material for a hollow concrete slab of the present invention. In addition, since concrete enters the plurality of divided portions, the concrete and the concrete substrate cast according to the size of the divided portions have higher rigidity above and below the hollow concrete slab embedding material of the present invention. Integrated into Furthermore, by dividing the embedding material for hollow concrete slab of the present invention into a plurality, when a concrete slab is formed, its natural frequency moves to a higher frequency than the natural frequency of the conventional concrete slab. Change.

According to the second aspect of the present invention,
When forming the hollow concrete slab substrate using the hollow concrete slab embedding material of the present invention, the communication groove is formed on the concrete substrate and divided into a plurality of portions of the hollow concrete slab embedding material of the present invention. It works to drain some water.

According to the third aspect of the present invention,
The hollow concrete slab substrate of the present invention is constituted by using the hollow concrete slab embedding material according to claim 1 or 2, and concrete is cast on the hollow concrete slab substrate of the present invention. When the slab is formed, the concrete enters the plurality of divided portions of the hollow concrete slab embedding material, and the cast concrete and the concrete substrate are integrated above and below the hollow concrete slab embedding material. In addition, since concrete enters into the divided portion of the hollow concrete slab embedding material, the concrete and the concrete substrate cast according to the size of the divided portion vertically move above and below the hollow concrete slab embedding material. Are integrated so as to increase rigidity. Furthermore, by using the embedded material for a hollow concrete slab divided into a plurality, when a concrete slab is formed, its natural frequency changes so as to move to a higher frequency than the natural frequency of the conventional concrete slab. .

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab of the present invention. 2 is a plan view of an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab, FIG. 3 is a perspective view of the embedding material for a hollow concrete slab, as viewed from the top side, and FIG. FIG. 5 is a perspective view of the material as viewed from the mounting surface side, and FIG.
FIG. 6 is a sectional view taken along the line BB of FIG. 2, and FIG. 7 is a sectional view of the concrete slab.

In FIG. 1, reference numeral 1 denotes an embedding material for a hollow concrete slab, which is a synthetic resin foam molded product. Reference numeral 2 denotes a hollow concrete slab substrate constituted by placing and embedding a hollow concrete slab embedding material 1 on a concrete substrate 3.

2 and 3, the hollow concrete slab embedding material 1 is formed of a synthetic resin foam material such as expanded polystyrene having closed cells, for example, so as to have a substantially box-like outer shape. . The embedding material 1 for a hollow concrete slab is composed of four divided embedding materials 4a,
4b, 4c, 4d (when collectively referred to, the reference sign is 4)
, The mounting surface side first connection portion 5, four mounting surface side second connection portions 6, four upper surface side connection portions 7, and a divided space portion 8. Split embedding material 4, placement surface side first connection portion 5, placement surface side second connection portion 6, and upper surface side connection portion 7
Is a continuous object integrally formed, and the divided space portion 8 indicates a space generated at a predetermined interval by the divided formation of the divided embedding material 4. The division direction is a vertical direction that is a direction orthogonal to the mounting surface 9 described later. The mounting surface side first connecting portion 5, the mounting surface side second connecting portion 6, and the upper surface side connecting portion 7
Corresponds to the connecting portion described in the claims.

The divided embedding materials 4a, 4b, 4c and 4d are
Each has the same size and a rectangular shape in plan view. The divided embedding members 4a, 4b, 4c, and 4d are arranged so that the whole of the embedding members is rectangular when viewed in plan.
That is, in plan view, the divided embedding materials 4a, 4b, 4
The short side of each of c and 4d and the long side of each one constitute the outer shape of the embedding material 1 for a hollow concrete slab, and the divided embedding material 4
a, the other short side of the divided embedding material 4b, the other long side of the divided embedding material 4b and the other long side of the divided embedding material 4c,
The other short side of the divided embedding material 4c and the other short side of the divided embedding material 4d, and the other long side of the divided embedding material 4d and the other long side of the divided embedding material 4a face each other. Are located.

Here, the structure of the divided embedding material 4 will be described. The divided embedding material 4 has a mounting surface (lower surface) 9 on the concrete substrate 3 and an upper surface 10 located on the opposite side of the mounting surface 9. It has an upper wall 11, a side wall 12 connected to the upper wall 11, and a plurality of hollow portions 13 opened on the mounting surface 9. In addition, recesses 14 for fixtures (not shown) used when forming the hollow concrete slab substrate 2 are formed in the four corners of the hollow concrete slab embedding material 1.

The outer peripheral surfaces of the mounting surface 9, the upper surface 10, and the side wall 12 are each formed flat, and the flat mounting surface 9 is formed with a communication groove 15 for communicating the hollow portion 13 with the outside. Have been. The communication groove 15 is formed so as to cut out the side wall 12 to a predetermined depth through the mounting surface 9, and by forming this, the inside of the hollow portion 13 is formed when the hollow concrete slab substrate 2 is formed. This has the advantage that no more water can collect. Two ribs 16 extending in the long side direction are formed in the hollow portion 13. The ribs 16 are for reinforcement, and function to increase the rigidity of the hollow concrete slab embedding material 1 itself.

The mounting surface side first connecting portion 5 is formed so as to be located at the center of the embedding material 1 for a hollow concrete slab and on the mounting surface 9 side. The mounting surface side first connecting portion 5 is formed in a cross shape in a plan view so as to collectively connect the respective corners of the divided embedding materials 4a, 4b, 4c, and 4d. A continuous surface 17 that is continuous with the mounting surface 9 is formed in the mounting surface side first connecting portion 5, and two continuous communication grooves 18 that function in the same manner as the communication groove 15 are formed in the continuous surface 17. It is formed in a cross shape so as to cut out between the edges of the continuous surface 17. In addition, the size (thickness etc.) of the mounting surface side first connection part 5 is as follows.
It is set appropriately in consideration of the rigidity of the embedding material 1 for a hollow concrete slab.

The mounting surface side second connecting portion 6 is formed so as to be located on the mounting surface 9 side similarly to the mounting surface side first connecting portion 5. The mounting surface side second connecting portion 6 is formed on the side constituting the outer shape of the embedding material 1 for a hollow concrete slab. A continuous surface 19 that is continuous with the mounting surface 9 is formed in the mounting surface side second connecting portion 6, and the continuous surface 19 has two continuous communication grooves that function in the same manner as the communication grooves 15 and 18. 20
Are formed so as to cut out between the edges of the continuous surface 19.

The four mounting surface side second connecting portions 6
The other short side end of the divided embedding material 4a and the other short side end of the divided embedding material 4b, the other long side end of the divided embedding material 4b and the other long side end of the divided embedding material 4c Part, the other short side end of the divided embedding material 4c and the other short side end of the divided embedding material 4d, and the other long side end of the divided embedding material 4d and the other of the divided embedding material 4a Are connected at their long sides.

The upper surface side connecting portion 7 is formed on the upper surface 10 side. Further, the upper surface side connecting portion 7 is formed so as to be located between the mounting surface side first connecting portion 5 and the mounting surface side second connecting portion 6 in plan view of the hollow concrete slab embedding material 1. ing. Then, similarly to the mounting surface side second connecting portion 6, the four upper surface side connecting portions 7 allow the center of the other short side of the split embedding material 4a and the center of the other short side of the split embedding material 4b to be divided and embedded. The center of the other long side of the material 4b, the center of the other long side of the split embedding material 4c, the center of the other short side of the split embedding material 4c, and the split embedding material 4
The center of the other short side of d, the center of the other long side of the divided embedding material 4d, and the center of the other long side of the divided embedding material 4a are connected.

The above-mentioned arrangement positions of the mounting surface side first connecting portion 5, the mounting surface side second connecting portion 6, and the upper surface side connecting portion 7 are merely examples, and are not limited thereto, and may be any suitable positions. It can be arranged and formed. Although not specifically described in detail, the divided space portion 8 which is positively generated by the arrangement of the divided embedding members 4a, 4b, 4c, and 4d is formed in a cross shape in a plan view.

The above-mentioned substrate 2 for hollow concrete slab
As shown in FIG. 1, a hollow concrete slab embedding material 1 and a concrete substrate 3 are provided. Although not particularly shown, a plurality of hollow concrete slab embedding materials 1 are provided at predetermined intervals. The concrete substrate 3 is formed by arranging a plurality of reinforcing bars (not shown) in a mold (not shown) and then placing concrete 21 in the mold.

In the above configuration, the hollow concrete slab substrate 2 is formed as follows. That is, in the first step, after the concrete 21 is poured into the formwork, the embedding material 1 for a hollow concrete slab is placed on the uncured concrete substrate 3.
At this time, a fixing tool (not shown) is used for the embedding material 1 for the hollow concrete slab. In addition, since the embedding material 1 for hollow concrete slabs is an integral thing, workability is naturally good. In the second step, curing is performed from the above state, and after curing, when the concrete 21 solidifies, the hollow concrete slab embedding material 1 is fixed on the concrete substrate 3. Thus, the hollow concrete slab substrate 2 is formed.

The concrete slab 22 shown in FIG. 7 is formed as follows. That is, the hollow concrete slab substrate 2 formed as described above is carried into a construction site, laid at a predetermined position, and cast in place concrete 23 is formed on the hollow concrete slab substrate 2.

When the cast-in-place concrete 23 is cast, the cast-in-place concrete 23 enters the divided space portion 8 of the hollow concrete slab embedding material 1, and the cast-in-place concrete 23 and the concrete substrate 3 are integrated.
In addition, the cast-in-place concrete 23 located above and below the hollow concrete slab embedding material 1, that is, above and below the hollow concrete slab embedding material 1 and the concrete substrate 3 are integrated by the divided space portion 8 so as to increase rigidity. I do. Needless to say, if the size of the divided space portions 8 is large, they are integrated so that the rigidity is further increased.

The concrete slab 22 is
The result shows that the natural frequency shifts to a higher frequency than the conventional one (the natural frequency of the conventional one is 1015 Hz. On the other hand, the embedding material 1 for hollow concrete slab of the present invention and the hollow concrete When the slab substrate 2 is used, the natural frequency changes to 1357 Hz.) When an impact sound is applied to the concrete slab 22, the result shows that the level of the impact sound is improved by approximately 10 dB in the band of 1 KHz to 2 KHz.

The above is attributable to the structure of the embedding material 1 for hollow concrete slabs. Accordingly, it is possible to provide an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab for forming a concrete slab having excellent sound insulation performance.

FIG. 8 is a plan view showing another example of an embedding material for a hollow concrete slab. That is, the quote 24
The hollow concrete slab embedding material represented by is molded by a foamed material of a synthetic resin such as expanded polystyrene having closed cells, for example, so that the outer shape is substantially box-shaped, and the eight divided embedding materials 25a to 25a are formed. 25h (in the case of generic terms, the reference numeral is 25. The division direction is the same as described above)
, Three mounting surface side first connection portions 26, eight mounting surface side second connection portions 27, eight upper surface side connection portions 28, and a divided space portion 29. The split embedding material 25, the mounting surface side first connecting portion 26, the mounting surface side second connecting portion 27, and the upper surface side connecting portion 28 are a continuous body integrally formed, and the split space portion 29 is divided and embedded. It indicates a space generated at a predetermined interval by the divisional formation of the material 25. The mounting surface side first connecting portion 26, the mounting surface side second connecting portion 27, and the upper surface side connecting portion 28
Corresponds to the connecting portion described in the claims. In addition, the mounting surface side first connection portion 26, the mounting surface side second connection portion 27, the upper surface side connection portion 28, and the divided space portion 29 are formed by the mounting surface side first connection portion 5 and the mounting surface side. The second connecting portion 6, the upper surface side connecting portion 7, and the divided space portion 8 have the same functions.

When a concrete slab (not shown) is formed by using the embedding material 24 for a hollow concrete slab as described above, the concrete slab becomes highly rigid and the natural frequency of the concrete slab becomes 1505 Hz. When an impact sound is applied to the concrete slab, the level of the impact sound is adjusted to the concrete slab 22 (FIG. 7).
About 10 d in the band of 1 KHz to 2 KHz as in
B is improved. Therefore, a concrete slab excellent in sound insulation performance can be formed even if the embedding material 24 for a hollow concrete slab is used not only in four parts but also in eight parts.

FIG. 9 is a plan view showing still another example of an embedding material for a hollow concrete slab. That is, the embedding material for a hollow concrete slab indicated by reference numeral 30 is formed by a synthetic resin foam material such as expanded polystyrene having closed cells so as to have a substantially box-like outer shape. The embedding materials 31a and 31b (the reference numeral is 31 in the collective case. The dividing direction is the same as described above), the mounting surface side first connection portion 32, and the two mounting surface side second connection portions 33. , Two upper surface side connecting portions 34, and a divided space portion 35. The split embedding material 31, the mounting surface side first connecting portion 32, the mounting surface side second connecting portion 33, and the upper surface side connecting portion are a continuous body integrally formed, and the split space portion 35 It indicates a space generated at a predetermined interval due to the divisional formation of the material 31. In addition, the mounting surface side first connection portion 32, the mounting surface side second connection portion 33, and the upper surface side connection portion 34,
This corresponds to the connecting portion described in the claims. In addition, the mounting surface side first connection portion 32, the mounting surface side second connection portion 33, the upper surface side connection portion 34, and the divided space portion 35 are connected to the mounting surface side first connection portion 5 and the mounting surface side. The second connecting portion 6, the upper surface side connecting portion 7, and the divided space portion 8 have the same functions. If the rigidity of the hollow concrete slab embedding material 30 itself permits, the embedding material 30 may be composed of, for example, the divided embedding material 31 and the mounting surface side first connection portion 32.

When a concrete slab (not shown) is formed by using the embedding material 31 for a hollow concrete slab as described above, the concrete slab has a high rigidity and the natural frequency of the concrete slab becomes 1262 Hz. When an impact sound is applied to the concrete slab, the level of the impact sound is adjusted to the concrete slab 22 (FIG. 7).
About 10 d in the band of 1 KHz to 2 KHz as in
B is improved. Therefore, a concrete slab excellent in sound insulation performance can be formed even by using the hollow concrete slab embedding material 31 divided into two, not limited to four and eight.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the gist of the present invention.

[0039]

As described above, according to the first aspect of the present invention, one or two or more connecting portions are left in the vertical direction perpendicular to the mounting surface for the concrete substrate. When the concrete slab is formed, the concrete (cast concrete) and the concrete substrate are rigidly connected above and below the hollow concrete slab embedding material of the present invention because the concrete slab is formed because the embedding material for the hollow concrete slab has a plurality of divided structures. Can be integrated so as to increase. When a concrete slab is formed using the embedding material for a hollow concrete slab of the present invention, the natural frequency of the concrete slab can be shifted to a higher frequency than the natural frequency of a conventional concrete slab. Therefore, it is possible to provide an embedding material for a hollow concrete slab for forming a concrete slab having excellent sound insulation performance. still,
Since the hollow concrete slab embedding material has a connecting portion, even if the structure is divided into a plurality of parts, it is connected via the connecting portion, and the hollow concrete slab substrate of the present invention according to claim 3 is formed. The embedding material for a hollow concrete slab can be placed on a concrete substrate in one operation. Therefore, the productivity of forming the substrate for hollow concrete slab of the present invention according to claim 3 can be maintained as in the conventional case.

According to the second aspect of the present invention,
When forming a substrate for a hollow concrete slab, water in a plurality of divided portions can be easily drained. In other words, puddles can be prevented.

According to the third aspect of the present invention,
The hollow concrete for forming a concrete slab excellent in sound insulation performance, since the embedding material for a hollow concrete slab according to claim 1 or 2 is mounted and fixed on a concrete substrate. A slab substrate can be provided. In addition, it is possible to provide a substrate for a hollow concrete slab which maintains the same manufacturability as a conventional one.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab according to the present invention.

FIG. 2 is a plan view of an embedding material for a hollow concrete slab and a substrate for a hollow concrete slab.

FIG. 3 is a perspective view of an embedding material for a hollow concrete slab as viewed from the upper surface side.

FIG. 4 is a perspective view of the embedding material for the hollow concrete slab as viewed from the mounting surface side.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a sectional view taken along line BB of FIG. 2;

FIG. 7 is a sectional view of a concrete slab.

FIG. 8 is a plan view showing another example of an embedding material for a hollow concrete slab.

FIG. 9 is a plan view showing still another example of an embedding material for a hollow concrete slab.

FIG. 10 is a plan view showing a conventional embedding material for a hollow concrete slab.

FIG. 11 is a sectional view of a concrete slab using a conventional hollow concrete slab substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embedding material for hollow concrete slab 2 Substrate for hollow concrete slab 3 Concrete substrate 4 Split embedding material 5 Mounting surface side first connection part (continuous part) 6 Mounting surface side second connection part (continuous part) 7 Top surface Side connection part (continuous part) 8 Divided space part 9 Placement surface 10 Upper surface 11 Upper wall 12 Side wall 13 Hollow part 14 Concave part 15 Communication groove 16 Rib 17 Continuous surface 18 Communication groove 19 Continuous surface 20 Communication groove 21 Concrete 22 Concrete slab 23 Cast-in-place concrete 24 Embedded material for hollow concrete slab 25 Embedded material 30 Embedded material for hollow concrete slab 31 Embedded material

Claims (3)

[Claims] 1. An embedding material for a hollow concrete slab, which is formed of a foam molded article integrally formed of a synthetic resin and is mounted and fixed on a concrete substrate, wherein one or more connecting portions are left. A hollow concrete slab embedding material, which is divided into a plurality of pieces in a vertical direction orthogonal to a mounting surface for the concrete substrate. 2. The embedding material for a hollow concrete slab according to claim 1, wherein the connecting portion having a continuous surface continuous with the placing surface has at least a communication groove notched between edges of the continuous surface. An embedding material for hollow concrete slabs, wherein one is formed. 3. A substrate for a hollow concrete slab, wherein the embedding material for a hollow concrete slab according to claim 1 is mounted and fixed on a concrete substrate.