JP2001214562A - Hollow slab embedding material, hollow slab base plate having it, and construction having hollow slab structure with fixed embedding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embedding material and a hollow slab base plate having it for easily and surely reducing a hollow ratio of a hollow slab structure without any deterioration in structural strength with a horizontal cross section area substantially equal to that of a conventional one. SOLUTION: On the back face of the embedding material 10, back face recesses 11, 12 are formed, and a through hole 15 communicated with the back face recesses is formed in the plate thickness direction. The embedding material 10 is fixed on a precast concrete plate 3 so as to be used as a hollow slab base plate A. When cast-in-place concrete is placed in a construction field, the cast-in-place concrete passes through the through hole 15 and easily fills the back face recesses 11, 12. In this way, a hollow ratio of the embedding material is lowered and high sound insulating performance of the hollow slab structure is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an embedding material for a hollow slab, a substrate for a hollow slab having the embedding material, and a structure having a hollow slab structure in which the embedding material is fixed.

[0002]

2. Description of the Related Art Recently, a floor structure of a concrete-type apartment house has a structure in which a lightweight embedding material is fixed on a precast concrete plate (PCa plate) and cast-in-place concrete is poured from above the cast-in-place concrete. A hollow slab structure in which an embedding material is buried is widely used. As shown in FIG. 16, an embedding material 1 made of a synthetic resin foam molded product such as expanded polystyrene and preferably having a recessed portion on the back side is placed on a precast concrete plate 3 provided with a truss bar 2 as shown in FIG. As shown in FIG. 17 or FIG.
A required number of frames are mounted between the beams B of the skeleton, and the installation pipe P is constructed using the space SS between the embedding materials 1 and 1,
After the reinforcement of the upper slab 4 of the slab is performed, the hollow slab CS is constructed by placing the cast-in-place concrete C. This hollow slab structure has the advantages that it is lightweight and has high rigidity, does not require small beams in the living room, and can freely plan the interior of the dwelling unit.

In the above hollow slab structure, as a countermeasure for the sound insulation performance of the upper and lower floors in an apartment house, as shown in FIG. 19a, a slit penetrates in the thickness direction between recessed portions 1b formed at predetermined intervals. Embedding material 1a formed with 1c
(FIG. 19b is a rear view thereof) is fixed on the precast concrete plate 3 by an appropriate number at predetermined intervals, and the cast-in-place concrete C is integrated vertically by passing through the slit 1c to the precast concrete plate 3, Thus, an embedding material has been proposed in which a resonance phenomenon in units of hollow portions is reduced as much as possible (see Japanese Patent No. 26013314).

[0004]

The above-mentioned Patent No. 26013
By constructing a hollow slab using the embedding material having the structure disclosed in Japanese Patent Application Publication No. 14, the problem of the sound insulation performance of the upper and lower floors in an apartment house has been improved to some extent. However, on the other hand, there is a demand to improve the overall living environment to a level that is more comfortable than the conventional standards, and higher levels of sound insulation performance on the upper and lower floors of apartment buildings are being demanded. However,
In the hollow slab structure, improving the sound insulation performance and reducing the weight are contradictory propositions, and in order to obtain high sound insulation performance (that is, increase the amount of concrete and increase the mass), the hollow ratio must be reduced. Not get.

Meanwhile, in the embedding material 1a having the structure disclosed in the above-mentioned Japanese Patent No. 2601314, the volume in which concrete can enter is only the slit 1c, and there is a limit. Increasing the cross-sectional area of the slit 1c increases the amount of concrete C infiltrated, and can further improve the sound insulation performance. However, the structural strength of the embedded material is reduced, and the material is fixed during transportation and on precast concrete boards and There is a risk of damage during construction work. As another method, it is conceivable to fix an embedding material having a small horizontal cross-sectional area to a precast concrete plate with a wide gap, but the fixing operation of the embedding material becomes complicated. Accordingly, a first object of the present invention is to provide an embedment having substantially the same horizontal cross-sectional area as the conventional one, but without reducing the structural strength of the embedment, allowing the hollow slab structure to have an arbitrary hollow ratio. An object of the present invention is to provide an embedding material that can be reduced to a minimum.

As described above, the primary purpose of the hollow slab structure is to reduce the weight of the concrete slab. However, in the case where an embedding material having a structure capable of arbitrarily reducing the hollow ratio of the hollow slab structure is fixed to the entire area of the floor surface, weight reduction must be sacrificed. On the other hand, in the living space of an apartment house,
There are a region where floor impact sound is likely to occur and a region where floor impact sound is relatively unlikely to occur. Therefore, by embedding the embedding material that can reduce the hollow ratio in the former area and embedding the conventionally used embedding material in the latter area, the floor area of a single dwelling unit as a whole is It is possible to satisfy both the weight reduction and the problem of the sound insulation performance of the upper and lower floors at the same time. Accordingly, another object of the present invention is to provide a hollow slab substrate and a structure having a hollow slab structure using the substrate or the embedding material, which can simultaneously satisfy both the problems of weight reduction and improvement of sound insulation performance. To provide.

[0007]

An embedding material for a hollow slab according to the present invention for solving the above-mentioned problems is fixed on a precast concrete plate and buried in the concrete by cast-in-place concrete. An embedding material that forms a hollow slab structure, and basically, on the side of the embedding material facing the precast concrete plate, a back surface depression that is upwardly convex and is opened in the side direction is formed,
Further, a through-hole communicating with the lower end of the backside recess is formed in the thickness direction, and the cast-in-place cast concrete flows into the backside recess through the through-hole, and the It is characterized in that it extends to the back side and is integrated with the concrete of the precast concrete plate.

[0008] In addition, a substrate for a hollow slab according to the present invention for solving the above-mentioned problems, comprises at least a part or all of a plurality of embedding materials fixed on a precast concrete plate of the substrate for a hollow slab. The embedding material is the embedding material in which the above-mentioned convex depression and the through hole in the thickness direction are formed.

Further, a structure having a hollow slab structure according to the present invention for solving the above-mentioned problems has a hollow slab substrate as a whole or a part of a substrate of the hollow slab structure, or has a high floor impact. An embedding material having the above-described upwardly projecting back surface dent and a through hole in the thickness direction is fixed in a region where the generation of sound is predicted, and the other region does not have at least the through hole. It is characterized by having a hollow slab structure in which a conventional embedding material is fixed or a cast-in-place concrete is cast without fixing the embedding material.

According to the embedding material and the hollow slab substrate provided with the embedding material according to the present invention, cast-in-place concrete
Through the through hole of the embedding material, it penetrates into the upwardly convex back surface dent formed on the back surface side of the embedding material, easily reaches the back surface side, and fills the back surface dent with concrete. Furthermore, the through holes are also filled with concrete. Thereby, in the hollow slab structure to be constructed, the hollow ratio occupied by the embedding material portion is equal to the volume of the upwardly convex backside depression (the volume may be arbitrarily determined according to design conditions). , The rigidity and the mass are increased, and the resonance phenomenon is reduced as much as possible. Thereby, the sound insulation performance is greatly improved.

[0011] In the embedding material according to the present invention, the horizontal cross-sectional area of the embedding material is substantially reduced only by the cross-sectional integral of the through-hole, and the structural strength is not greatly reduced. The upwardly convex backside depression is also opened in the side direction of the embedding material, and the cast-in-place concrete flows through the opening in the side direction. Thereby, the fluidity of the cast-in-place concrete into the backside depression is increased, and the concrete can be reliably filled into the backside depression without gaps, and a predetermined sound insulation performance can be reliably ensured.

[0012] The embedding material may preferably have a shape in which a surface side shape in a cross section has an upwardly convex chevron shape. In this case, the vibration caused by the floor impact on the upper concrete shell part of the concrete slab hollow part is dissipated along the curved surface of the upper concrete shell part in the convex mountain shape above the embedding material. Dispersion is attenuated, and the bending generated in the concrete shell portion is reduced, and as a result, the occurrence of resonance itself is suppressed as compared with the case where an embedding material having a rectangular cross section in the short direction is used, Sound insulation performance is further improved.

[0013] In a preferred aspect, the surface side of the through hole may have a funnel-shaped inclined surface extending upward.
Also, a depression is formed on the surface of the embedding material, and at least a part of the upper end of the through hole is open to the surface depression. In another preferred embodiment, the back surface of the embedding material may be an inclined surface in which the side surface direction is higher, or a plurality of quadrangular pyramids whose heads having four inclined surfaces are cut off. May be. In these embodiments, the inflow of cast-in-place concrete into the through-hole is further ensured, and concrete is also formed in the surface depression or in the space region between the surface of the precast concrete plate and the back surface of the embedding material. , The rigidity and mass of the region increase, the resonance phenomenon can be further reduced as much as possible, and the sound insulation performance can be further improved.

As mentioned above, the primary purpose of hollow slabs in construction is to reduce the weight of concrete slabs.
Therefore, embedding an embedding material capable of reducing the above-described hollow ratio over the entire surface of the concrete slab is intended to improve the sound insulation performance, but does not necessarily achieve the intended purpose of the hollow slab structure. Can also occur.
Therefore, in the hollow slab substrate or the structure having the hollow slab structure according to the present invention, at least a part of the multitude of burying materials buried by cast-in-place concrete is capable of reducing the above-described hollow ratio. Other embedding materials are conventionally known embedding materials, so that both the problems of weight reduction and improvement of sound insulation performance are simultaneously satisfied.

At this time, an area where a high floor impact sound is expected to be generated such as an area used for living (area of a living room) such as a living room, a tea room, a bedroom, a guest room, a reception room, etc. in a living space. In the floor area including the above, embedding material that can reduce the hollow ratio described above is fixed to ensure sound insulation performance, while other non-living areas such as kitchens, toilets, bathrooms, and sheds are conventionally known Fix the embedded material to ensure the required hollowness.

In still another embodiment of the hollow slab substrate or the hollow slab structure having a hollow slab structure according to the present invention, a part where a water distribution pipe such as a bathroom, a toilet, a toilet room, etc. needs to be installed in a horizontal direction is a large floor. Since it is a place where a foot is needed, the embedding material is not fixed in that area. By doing so, the floor surface of the house can be made smooth as a result throughout the dwelling unit, and as the aging society comes, for the safety of the elderly or the convenience of using a wheelchair, It can answer the request to eliminate the difference in height of the floor finish of the house.

In the present invention, any material can be used as the material of the embedding material, provided that it is lightweight and does not deform due to the concrete to be cast.
A synthetic resin foam molded article such as expanded polystyrene is most preferably used. In addition, a foam such as a styrene-based resin, a polyolefin-based resin, a hard urethane resin, a phenol resin, a polyisothianate resin, or an epoxy resin, or a foam obtained by appropriately mixing these resins can be used. The foaming method is optional, and may be appropriately selected depending on the synthetic resin material to be used, such as extrusion foaming or foaming in a bead mold, and the shape of the embedding material to be molded.

The styrene resin may be a polymer having a styrene-based vinyl monomer such as styrene, methylstyrene or dimethylstyrene as a main constituent unit.
Weight percent or more of the copolymer, acrylic acid as a monomer that can be copolymerized with the styrenic monomer,
Examples include methacrylic acid or esters thereof, acrylonitrile, methacrylonitrile, maleic anhydride and the like.

Examples of the polyolefin resin include high-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-carboxylate copolymer,
Examples thereof include an ethylene-carboxylic acid metal salt copolymer, a crystalline polypropylene homopolymer, a crystalline propylene-ethylene copolymer, and a crystalline propylene-ethylene-diene terpolymer.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a part of a hollow slab substrate A using a hollow slab embedding material 10 according to the present invention, and FIG. 2 is a diagram showing a structure constructed using the hollow slab substrate A shown in FIG. It is a fragmentary sectional view of a hollow slab. The overall shape of the hollow slab substrate A is the same as that described with reference to FIG. 16, and truss bars and the like are omitted in FIG. In the hollow slab substrate A, an appropriate number of the embedding materials 10 according to the present invention may be fixed on the whole of the precast concrete plate (PCa plate) 3 at appropriate intervals, or will be described later. As described above, in a structure having a hollow slab structure, the embedding material according to the present invention is used only in a region where a high floor impact sound is expected to be generated in a normal living environment such as a living room / dining room, a Western room, a Japanese room, etc. 10 may be fixed, and a conventional embedding material 1 having a flat surface and a concave portion on the back side may be fixed to other portions.

The embedding material 10 is of a box shape,
That is, on the side facing the precast concrete plate 3, an appropriate number (two in the illustrated example) of the first back grooves 11 in the longitudinal direction that are upwardly convex, and the short sides in the short direction that are also upwardly convex. An appropriate number of second backside grooves 12 (two in the figure, a pair of six in total) are formed so as to intersect each other with both ends open to the side surfaces 10a and 10b of the embedding material 10. Have been. Although not shown, a recess may be formed in a portion where the first and second backside grooves 11 and 12 are not formed, similarly to the conventional embedding material. In addition, this first
And the second back surface grooves 11 and 12 correspond to the back surface depression in the present invention.

The first back surface groove 11 and the second
A first surface groove 13 that is downwardly convex and a second surface groove 14 that is also downwardly convex are similarly formed at positions facing the back surface groove 12. In each crossing portion of each groove, an appropriate number (12 in total in the figure) of through holes 15 communicating from the front surface groove to the rear surface groove are formed in the thickness direction. The presence or absence of the surface grooves 13 and 14 is optional, and one or both of them may be omitted. The first and second surface grooves 13 and 14 correspond to surface depressions according to the present invention.

Further, as shown in the figure, the embedding material 10 is formed with cut lines 16 along the transverse direction at positions where the whole is substantially divided into three in the longitudinal direction. When the hollow slab is constructed, for example, when the hollow slab is constructed, it is necessary to use a smaller embedding material due to, for example, the condition of the piping, or when it is desired to construct a hollow slab structure having a higher sound insulation effect. Is used to easily separate and divide one embedding material 10 by using the cut line 16. The number of cut lines 16 and the positions where the cut lines 16 are provided are arbitrary and may be omitted.

An embedding material 10 is fixed on a precast concrete plate 3 provided with a truss bar 2 at a predetermined interval at an appropriate interval, similarly to a conventional hollow slab substrate, and a hollow slab substrate A is manufactured. As shown in FIG. 17, a required number of the hollow slab substrates A are mounted between beams B of the skeleton, and if necessary, the installation of the equipment pipes P and the reinforcement of the top slab 4 of the slab are performed. After performing, cast-in-place concrete C is poured.

The cast-in-place concrete C is passed through a through hole 15 formed in the embedding material 10, and the first back surface groove 11 and the second back surface groove 12 which are convex on the back surface of the embedding material.
Flow into The first back surface groove 11 and the second back surface groove 12 have both ends open to the side surfaces 10a and 10b of the embedding material 10, and the cast-in-place concrete C flows into the back surface groove from the open ends. As a result, the first back surface groove 11
And the second back surface groove 12 is easily and reliably filled with the cast-in-place concrete C. Cast-in-place concrete C
After the through holes 15 and the first and second surface grooves 13 and 14 are also filled, a concrete layer having a required thickness is formed on the embedding material 10 as shown in FIG. 2, and the concrete hardens. This builds the hollow slab in the required construction. In the illustrated example, the ceiling surfaces of the first and second rear grooves 11 and 12 that are upwardly convex are shown as flat surfaces, but the vicinity of the center in the longitudinal direction of the ceiling surface protrudes downward. Such a ship bottom type can also be used, whereby the filling with the cast-in-place concrete C in the backside grooves 11, 12 can be further ensured.

In the hollow slab structure constructed as described above, the hollow ratio occupied by the embedding material 10 depends on the upwardly projecting first and second backside grooves 11 and 12, the through hole 15, and the first hole.
And the second surface grooves 13 and 14 are reduced by the total volume, and the rigidity and mass of that portion are increased, and the occurrence of the above-described resonance phenomenon can be reduced as much as possible. The sound insulation performance of the slab structure is greatly improved. In the illustrated embedding material 10, the horizontal cross-sectional area is substantially reduced only by the cross-sectional integral of the through hole 15.
Compared with the conventional embedding material shown in FIG. 6, there is no structurally significant reduction in strength.

There are many other forms of the embedding material that can fulfill the above functions. 3A is a perspective view, and FIG. 3B is a cross-sectional view taken along the line bb. The embedding material 10A has a longitudinal back surface groove (back surface depression) 11 that is convex upward on the back surface side.
And one surface groove (surface depression) 1 that is convex downward on the surface side
4 are formed, and the bottom surface 141 of each surface groove 14 is positioned lower than the position of the ceiling surface 111 of the back surface groove 11. As a result, a through-hole 15 is formed substantially at the intersection of the back surface groove 11 and the front surface groove 14 so as to communicate the lower end with the back surface groove 11. In the figure, 16 is
This is a score line formed at a position where the entire embedding material 10A is divided into approximately three in the longitudinal direction.

Also in this embedding material 10A, the cast-in-place concrete C flows into the back surface groove 11 through the through hole 15. At the same time, it flows into the back surface groove 11 also from the side open end of the back surface groove 11, and the inside of the back surface groove 11 is easily and reliably filled with the cast-in-place concrete C. In addition, surface groove 1
Four parts are also filled with cast-in-place concrete C. Thereby, in the hollow slab structure in which the embedding material 10A is fixed, the hollow ratio occupied by the embedding material 10A is reduced by that amount, and the sound insulation performance of the hollow slab in the building is reliably improved. Also in this case, the horizontal cross-sectional area of the embedding material 10A substantially only reduces the cross-sectional integral of the through-hole 15, and does not cause a significant structural decrease.

FIG. 4 shows still another embodiment of the embedding material according to the present invention. FIG. 4A is a perspective view, and FIG.
FIG. 3 shows a sectional view along the line. The embedding material 10B is formed with an appropriate number (three in the illustrated example) of back surface dents 21 projecting upward on the back surface side, and each back surface dent 21 is formed on the side surface 10a, 10b of the embedding material 10B. , Each having an open end 22. A through hole 15 is formed in the center of the ceiling of each back surface recess 21 so as to pass through the surface of the embedding material 10B, and the surface side of the through hole 15 has a funnel-shaped inclined surface 15 extending upward.
a. In the figure, reference numeral 16 denotes a score line formed at a position where the entire embedding material 10B is divided into approximately three in the longitudinal direction.

Also in this embedding material 10B, the cast-in-place concrete C flows into the backside recess 21 through the through-hole 15, and also flows into the backside recess 21 through the side open end 22 of the backside recess 21. Thereby, the inside of the back surface depression 21 is easily and reliably filled with the cast-in-place concrete C. In particular, the front side of the through hole 15 is a funnel-shaped inclined surface 15a that expands upward, thereby ensuring that the cast-in-place concrete C flows into the back surface depression 21. The through hole 15 is also filled with the cast-in-place concrete C as in the case of other forms. Even in the hollow slab structure using the embedding material 10B, the hollow ratio occupied by the embedding material 10B is surely reduced, and the sound insulation performance of the hollow slab in the building is improved. In addition, although the strength of the embedding material 10B is hardly reduced, the area of the back surface depression 21 facing the precast concrete plate 3 can be made larger than that of the other structures described above. The rigidity and mass of the region are further increased.

FIG. 5 shows still another embodiment of the embedding material according to the present invention. FIG. 5A is a perspective view, and FIG. 5B is a perspective view from the back. The embedding material 10C has an upwardly convex back surface groove (back surface depression) 11 extending in the longitudinal direction on the back surface side.
On the front surface side, a longitudinal surface groove (surface depression) 13 protruding downward at a position facing the back surface groove 11.
And three short-side surface grooves (surface depressions) 14 that are convex downward in a direction perpendicular to the surface grooves 13. The embedding material 10C has a cross section in the transverse direction having a ship bottom shape. As shown in the figure, the entire back surface has the lowest portion of the back surface groove 11, and both sides have longitudinal side surfaces 10b. Inclined surfaces 31, 31 rising toward. Then, legs 32 are provided on the inclined surfaces 31, 31 for the purpose of stabilizing the posture when the embedding material 10C is placed on the precast concrete plate 3. The legs 32 may be omitted.

Further, an appropriate number of through holes 15 are formed in the front surface groove 13 in the longitudinal direction so as to pass through the back surface groove 11.
A side edge near the lower end of the through hole 15 in the back surface groove 11 is formed as a notch 33 that is convex upward. Also,
An appropriate number of through-holes 15b that penetrate through the inclined surfaces 31, 31 are also formed in the surface grooves 14 in the respective lateral directions. In the figure, reference numeral 16 indicates that the entire embedding material 10C is substantially 3
It is a score line formed at a position to be divided.

In this embedding material 10C, the cast-in-place concrete C flows into the back surface groove 11 through the through hole 15 and also passes through the through hole 15b.
C also flows between the back inclined surfaces 31 and 31 and the surface of the precast concrete plate 3. Furthermore, the cast-in-place concrete C is also used for the back surface groove 1 from the side open end of the back surface groove 11.
1 and the cast-in-place concrete C flows in the notch 33 as well. The cast-in-place concrete C flows into the space between the rear inclined surfaces 31 and 31 of the embedding material 10C and the surface of the precast concrete plate 3 from outside. Further, the surface grooves 13, 14 are also filled with the cast-in-place concrete C.

In the hollow slab structure using the embedding material 10C, as described above, the space area between the surface of the precast concrete plate 3 and the rear inclined surfaces 31, 31 of the embedding material 10C is filled with the cast-in-place concrete C. As a result, the hollow ratio of the portion occupied by the embedding material 10C can be further reduced as compared with the embedding material having a flat bottom surface, and the rigidity and mass of the region can be further increased. Therefore, the sound insulation performance of the hollow slab in the structure is definitely improved. In the horizontal cross-sectional area of the embedding material 10C, only the cross-sectional integration of the through holes 15 and 15b is substantially reduced, and the structural strength is hardly reduced.

FIG. 6 shows still another embodiment of the embedding material according to the present invention. FIG. 6a is a perspective view seen from above, and FIG. 6b is a perspective view seen from the back. This embedding material 1
0D is the same as the embedding material 10C shown in FIG. 5 on the surface side, and has one longitudinal surface groove 13 which is convex downward, and a convex downward in the direction orthogonal to the surface groove 13. The three surface grooves 14 in the short direction are formed. A cut line 16 is formed at a position where the entire embedding material 10D is substantially divided into three in the longitudinal direction. The back surface of the embedding material 10D has a head portion for each block partitioned by the cut line 16. Are cut off, and each has four inclined surfaces 41. Each quadrangular pyramid portion has a longitudinal surface groove 13 and a lateral surface groove 14 formed on the surface.
An upwardly convex rear surface groove (rear surface depression) 11 extending in the longitudinal direction and an upwardly convex rear surface groove (rear surface depression) 12 extending in the lateral direction are formed in a cross shape at a position opposed to. Further, an appropriate number of through-holes 15 are formed in the longitudinal surface groove 13 so as to pass through the back surface groove 11.
Are formed.

In the embedding material 10D, the cast-in-place concrete C flows into the back grooves 11, 12 through the through holes 15 and the through holes 15b. On the other hand, the embedding material 10D
Of each inclined surface 41 on the back side of the precast concrete plate 3
Cast-in-place concrete C from outside also in the space between the surfaces
Flows into the rear grooves 11, 12 through the side openings of the rear grooves 11, 12 from there. Further, the through holes and surface grooves are also filled with cast-in-place concrete C.

In the hollow slab structure using the embedding material 10D, the space area between the surface of the precast concrete plate 3 and the twelve back inclined surfaces 41 of the embedding material 10D can be filled with cast-in-place concrete C. So Figure 5
The hollow ratio of the portion occupied by the embedding material 10D can be further reduced as compared with the embedding material 10C shown in (1), and the sound insulation performance of the hollow slab in the building is reliably improved. Further, as in the other embodiments described above, the horizontal cross-sectional area of the embedding material 10D substantially only reduces the cross-sectional integration of the through holes 15 and 15b, and the structural strength hardly decreases.

Incidentally, in order to fix the embedding materials 10 to 10D on the surface of the precast concrete plate 3, for example, fixing may be performed using a locking tool as shown in Japanese Patent Publication No. 57-47008. As shown in Japanese Unexamined Patent Publication No. 54-138018, a convex portion may be formed on the back surface of the embedding material and fixed by pressing the convex portion, or may be fixed with an adhesive or an adhesive tape. Good. In addition, the embedding materials 10 to 10D can be fixed in a state of being floated from the surface of the precast concrete plate 3 on condition that a predetermined cover is formed between the surface of the embedding material and the upper slab upper line 4. In this case, the cast-in-place concrete C enters the entire back surface side of the embedding materials 10 to 10D, and it is possible to obtain a hollow slab structure having higher sound insulation performance. FIG. 7 shows an example of an embedding material fixing mode in such a case. Here, the embedding material is fixed using an embedding material support 50.

That is, the precast concrete plate 3
When the precast concrete board 3 is manufactured, an embedding material support 50 having a shape such that the back surface (back surface) of the embedding material to be fixed thereon can be held in a stable posture when manufacturing the same.
The embedding material is fixed thereon by an appropriate means. The illustrated one is an example in which an embedding material 10C (here, legs 32 are omitted) having a bottom surface of a ship bottom type cross section shown in FIG. 5 is used. Left and right rear inclined surfaces 31, 31 of the filling material 10C
Is bent in an M-shape so as to conform to. 7 is merely an example, and as described above, the embedding material support 50 has a stable posture on the back side (rear side) of the embedding material to be fixed thereon and rises up. Any shape can be used as long as it can be held in a state in which the embedding material is used.

8 to 13 show still another embodiment of the embedding material according to the present invention. The embedding materials 10 to 10D shown in FIGS. 1 to 7 basically have a flat surface, and an appropriate surface depression is formed on the flat surface as needed. The embedding material shown in FIG. 13 to FIG. 13 is characterized by having at least a portion where the shape on the surface side in the cross section has an upwardly convex mountain shape.

For example, the embedding material 200 shown in FIG. 8 has a box shape as a whole, but a plurality of (four in the figure) mountain-shaped ridges 201 are arranged in the longitudinal direction on the surface side. A plurality of (three in the figure) concave grooves 214 are formed so as to be orthogonal to the four ridges 201. At a position corresponding to the concave groove 214 on the rear surface side, an upwardly convex rear surface groove 211 is formed in parallel with the concave groove 214, and the rear surface groove 211
Both ends are open to the side surfaces 200a and 200b of the "00".
Although not shown, a concave portion may be formed in a portion where the back surface groove 211 is not formed, similarly to the conventional embedding material. In addition, this back surface groove 211 corresponds to a back surface depression in the present invention.

Further, an appropriate number (4 × 3, 12 in total in the figure) of through holes 215 communicating the concave groove 214 and the back surface groove 211 are formed in the plate thickness direction.
Also, an appropriate number of through holes 215a (four in the drawing, only in the central depression portion) are formed in the depression between the ridge 201 and the protrusion 201 from the front surface to the rear surface. The ridge 20
The depression between 1 and the ridge 201 also corresponds to the surface depression referred to in the present invention.

The embedding material 200 is fixed on the precast concrete plate 3 provided with the truss bars 2 at a predetermined interval at a predetermined interval in the same manner as the embedding materials 10 to 10D shown in FIGS. The slab substrate A is manufactured. Then, a hollow slab of a required structure is constructed using the substrate A for the hollow slab as shown in FIG. At that time, the cast-in-place concrete C flows through the through holes 215 and 215a formed in the embedding material 200 into the back surface groove 211 that is convex on the back surface of the embedding material, and The cast-in-place concrete C flows into the back surface groove from the open end of the back surface groove 211, as shown in FIG.
The same as in the case of 10D.

Further, in the hollow slab structure constructed using the hollow slab substrate A on which the embedding material 200 has been fixed, the hollow slab structure is formed on the upper surface of the convex ridge 201 in the surface of the embedding material 200. Vibration caused by the floor impact on the upper concrete shell portion is dissipated and attenuated along a curved surface along the upper surface of the ridge 201 of the concrete shell portion. Is smaller than that of a flat embedding material.
Thereby, the occurrence of resonance related to the existence of the hollow portion in the hollow slab is suppressed, and the sound insulation performance of the hollow slab is further improved.

The embedding material 200A shown in FIG. 10 has a convex ridge 250 which also has a downwardly convex ridge shape on the back surface side of the ridge 201 having the chevron shape in the above-described embedment material 200. The configuration differs from that of the embedding material 200 in that a gap 251 is formed between the ridge 201 and the front surface to the back surface. Also in this embedding material 200A, the cast-in-place concrete C can flow into the back surface groove 211 through the through hole 215 and the gap 251 and the hollow formed using the hollow slab substrate A on which the embedding material 200A is fixed. In the slab structure, the embedding material 200
The vibration caused by the floor impact on the upper concrete shell portion formed on the upper surface of the mountain-shaped ridge 201 on the surface of A is similar to the case of the embedding material 200, and the ridge of the concrete shell portion is formed. It escapes and attenuates along the curved surface along the upper surface of 201, and the occurrence of resonance related to the existence of the hollow portion in the hollow slab is suppressed.

As for the embedding material 200B shown in FIG. 11, a plurality of cylindrical bodies 260 as a whole (two in FIG. 11 are shown, but the number is arbitrary) is integrally formed adjacently. The cylindrical body 260 is formed with an appropriate number (three in the figure) of through holes 215 penetrating from the front surface to the rear surface, and the through holes 215 are also formed on the joint surfaces between the cylindrical bodies 260.
a is formed in an appropriate number (four in the figure). Further, at a position on the back surface side corresponding to the place where the through hole 215 is formed, a back surface groove 211 which is upwardly convex is formed in a direction orthogonal to the axis of the cylindrical body 260. The back surface grooves 211 are for the side surfaces 200a, 200b of the embedding material 200B.
Both ends are open. It is unnecessary to explain that the embedding material 200B also has the same function as the embedding material 200 or 200A.

An embedding material 200C shown in FIG. 12 has a through-hole 21 penetrating from one surface to the other surface in one cylindrical cylinder 260.
5 are formed (three in the figure), and on the back side corresponding to the place where the through hole 215 is formed,
An upwardly convex back surface groove 211 is formed in a direction perpendicular to the axis of the cylinder 260. An embedding material 200 shown in FIG.
D is different from the embedding material 200C shown in FIG. 12 in that the cross-sectional shape of the cylinder 260 is not circular but elliptical, and the other shapes are the same. In the case of these embedding materials, similarly to the embedding material 200 or 200A, the precast concrete plate 3 having the truss bars 2 is used.
The hollow slab substrate A is manufactured by fixing an appropriate number of the substrates at predetermined intervals, and in the hollow slab constructed using the hollow slab substrate A, these embedding materials are other than those described above. It will not be necessary to explain that it can perform the same function as the implant.

Next, an example of a case where a hollow slab of an actual building is constructed using the above-described hollow slab substrate A to which the embedding material according to the present invention is fixed will be described. FIG. 14 is a plan view showing an example of a floor plan of an apartment house, and FIG. 15 is a plain view of the slab, showing a state before the cast-in-place concrete C is cast. As described above with reference to FIG. 17, the required number of hollow slab substrates A (in this example, FIG. 15) is provided between the beams (not shown in FIGS. 14 and 15) of the skeleton.
5 sheets, A1 to A5) are mounted as shown in
After the cast-in-place concrete is cast into a hollow slab structure, a living space is constructed with a layout as shown in FIG.

In the example shown in FIG. 14, a living room / dining room and a Japanese-style room are on the veranda side, and a Western-style room 1 and a kitchen are located inside the veranda, and a Western-style room 2 and a bathroom are located further inside (a common corridor side).
Washing room, entrance, etc. are located. In the living space described above, living rooms such as a living room / dining room, a Western-style room, and a Japanese-style room are areas where high floor impact sounds are expected to occur in normal living conditions due to children's jumping, running sounds, etc. Can, on the other hand, kitchen, bathroom, washroom,
A non-living room such as an entrance can be said to be a region in which a high floor impact sound is unlikely to occur as compared with a living room / dining room, a Western-style room, a Japanese-style room, and the like.

Therefore, as the hollow slab substrates A1 and A2 to be attached to the area which becomes the living room / dining room and the Japanese-style room, the embedding material (10-1
0D, 200-200D) (shown by hatching) fixed on the entire surface of the precast concrete plate 3 to ensure sound insulation performance. On the other hand, as the remaining hollow slab substrates A3 to A5, embedding materials (10 to 10D, 200 to 200D) capable of reducing the hollow ratio according to the present invention are provided in and around the regions to be the Western room 1 and the Western room 2.
(Indicated by hatching), and in other areas (kitchen, bathroom, washroom, non-living room area such as entrance), there is no known means for reducing the hollow ratio. By using a substrate for a hollow slab in which a filling material is fixed, sound insulation performance is partially secured, and a necessary hollow ratio is also secured.

Although not shown in the figure, a part where the water pipe is required to be installed horizontally, such as a bathroom, a toilet, and a dressing room, is a place that requires a large floor space. The cast-in-place concrete may be cast without placing the embedding material itself. Thus, the floor surface of the house can be smooth over the dwelling unit, and the height difference of the floor surface of the house can be eliminated for the safety of the elderly or the convenience of using a wheelchair.

[0052]

As can be seen from the above description, according to the present invention, the hollow ratio of the hollow slab structure can be easily and reliably increased without incurring a structural strength decrease while having substantially the same horizontal cross-sectional area as in the prior art. An embedding material which can be reduced, and a substrate for a hollow slab having the embedding material can be obtained. Further, by using the embedding material or the hollow slab substrate having the embedding material according to the present invention, the entire floor area of a single dwelling unit can simultaneously satisfy both the problems of weight reduction and improvement of sound insulation performance. A building having a hollow slab structure can be easily constructed.

[Brief description of the drawings]

FIG. 1 is a view illustrating a hollow slab substrate having an embedding material according to the present invention.

FIG. 2 is a cross-sectional view illustrating a hollow slab structure constructed using the hollow slab substrate shown in FIG.

FIG. 3 is a view for explaining another embodiment of the embedding material according to the present invention, and FIG. 3A is a perspective view, and FIG.
3 shows a cross-sectional view along the line b.

FIG. 4 is a view for explaining still another embodiment of the embedding material according to the present invention. FIG. 4a is a perspective view, and FIG. 4b is FIG. 4a.
2 shows a cross-sectional view along the line bb.

5A and 5B are diagrams illustrating still another embodiment of the embedding material according to the present invention, wherein FIG. 5A is a perspective view and FIG. 5B is a perspective view as viewed from the back.

6A and 6B are views for explaining still another embodiment of the embedding material according to the present invention, wherein FIG. 6A is a perspective view and FIG. 6B is a perspective view as viewed from the back.

FIG. 7 is a view for explaining an embodiment of a mode of fixing an embedding material to a precast concrete plate according to the present invention,
It is fixed using an embedding material support.

8A and 8B are views for explaining still another embodiment of the embedding material according to the present invention, wherein FIG. 8A is a perspective view, FIG. 8B is a side view, and FIG. 8C is a cross section taken along line cc of FIG. The figure is shown.

FIG. 9 is a sectional view illustrating a hollow slab structure constructed using the hollow slab substrate shown in FIG. 8;

10A and 10B are views for explaining still another embodiment of the embedding material according to the present invention, wherein FIG. 10A is a perspective view, FIG. 10B is a side view, and FIG. 10C is a cross section taken along line cc of FIG. 10A. The figure is shown.

11 is a view for explaining still another embodiment of the embedding material according to the present invention, FIG. 11a is a perspective view, FIG. 11b is a side view, and FIG. 11c is a line c-c and d of FIG. 11a. FIG. 4 shows a cross-sectional view taken along line -d.

12A and 12B are views for explaining still another embodiment of an embedding material according to the present invention, wherein FIG. 12A is a perspective view, FIG. 12B is a side view, and FIG. 12C is a cross section taken along line cc of FIG. 12A. The figure is shown.

13A and 13B are views for explaining still another embodiment of the embedding material according to the present invention. FIG. 13A is a perspective view, FIG. 13B is a side view, and FIG. 13C is a cross section taken along line cc of FIG. 13A. The figure is shown.

FIG. 14 is a plan view showing an example of a layout of an apartment house.

FIG. 15 is a raw slab plan view of the floor plan shown in FIG. 14;

FIG. 16 is a bird's-eye view showing a conventional hollow slab substrate.

FIG. 17 is a view showing an example of a hollow slab structure and a structure using a conventional hollow slab substrate.

FIG. 18 is a diagram illustrating a piping state using a conventional hollow slab substrate.

FIG. 19a is a diagram illustrating a cross section of a hollow slab structure using an embedding material of another conventional shape, and FIG.
b is a bottom view of the embedding material used.

[Explanation of symbols]

A: substrate for hollow slab, C: cast-in-place concrete, 3
... Precast concrete board (PCa board), 10-1
0D, 200 to 200D: embedding material, 11, 12: upwardly convex grooves formed on the back side of the embedding material (recessed recesses), 13, 14: front side of the embedding material Recesses (surface depressions) formed on the bottom surface, 15 ... through-holes communicating the lower end with the depressions on the back surface, 50 ... embedded material support

Claims (15)

[Claims] 1. An embedding material which is fixed on a precast concrete board and is buried in the concrete by cast-in-place concrete to form a hollow slab structure, wherein the precast concrete board of the embedding material is provided. On the side facing the rear surface is formed a rear surface depression that is convex upward and is open in the side direction, and further, a through hole communicating with the lower end of the rear surface depression is formed in the plate thickness direction, and the above-described casting is performed. The cast-in-place concrete flows through the through-hole into the recess on the back side, spreads on the back side of the embedding material, and is integrated with the concrete of the precast concrete plate. Material. 2. The embedding material according to claim 1, wherein the embedding material has a portion in which a surface side shape in a cross section has an upwardly convex chevron shape. 3. The convex mountain-shaped portion is formed in a plurality of rows in parallel, and at least a part between each row is formed with a space penetrating in a vertical direction. An embedding material according to claim 2. 4. The embedding material according to claim 1, wherein the surface side of the through hole has a funnel-shaped inclined surface extending upward. 5. The embedding material according to claim 1, wherein the embedding material also has a depression on the surface, and an upper end of at least a part of the through hole is open to the surface depression. Embedded material. 6. The embedding material according to claim 1, wherein the back surface of the embedding material is an inclined surface having an upper surface on a side surface side. 7. The embedding material according to claim 1, wherein the back surface of the embedding material is a plurality of quadrangular pyramids whose heads having four inclined surfaces are cut off. Material. 8. The embedding material according to claim 6, wherein the inclined surface includes a leg. 9. The embedding material is provided with a score line dividing the whole in a longitudinal direction.
An embedding material according to any of the above. 10. A hollow slab substrate obtained by fixing a plurality of embedding materials on a precast concrete plate,
10. A hollow slab substrate, wherein at least a part or all of the plurality of embedding materials is the embedding material according to any one of claims 1 to 9. 11. A structure having the hollow slab substrate according to claim 10 as all or a part of the substrate having the hollow slab structure. 12. The hollow slab substrate according to claim 10 is used in an area where a high floor impact sound is expected to be generated, and in other areas, a normal embedding without at least said through hole is used. 12. The structure according to claim 11, wherein a hollow slab structure is used, in which a hollow slab substrate to which a material is fixed or an embedding material is not fixed is used, and cast-in-place concrete is cast thereon. 13. An embedding material according to any one of claims 1 to 9, wherein said embedding material is fixed in an area where a high floor impact sound is expected to be generated, and at least said through hole is not formed in other areas. A structure having a hollow slab structure in which an embedding material is fixed or cast-in-place concrete is cast without fixing the embedding material. 14. The area in which the generation of the high floor impact sound is predicted is a living room, a tea room, a bedroom, a guest room, or a living room in a living space.
14. The building having a hollow slab structure according to claim 12, wherein the building is a floor portion including at least a living room area such as a reception room. 15. The area where the embedding material is not fixed is a floor portion such as a bathroom, a toilet, or a washroom where it is necessary to install a water distribution pipe sideways.
14. A structure having the hollow slab structure according to 2 or 13.