JP3709394B2 - Hollow slab embedding material, hollow slab substrate having the embedding material, and structure having a hollow slab structure in which the embedding material is fixed - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow slab embedding material, a hollow slab substrate having the embedding material, and a structure having a hollow slab structure in which the embedding material is fixed.
[0002]
[Prior art]
The floor structure of a recent concrete-based apartment building is that a light-weight embedding material is fixed on a precast concrete board (PCa board), and then cast-in-place concrete is placed on top of that to place the embedded material in the in-situ concrete. Hollow slab structures that are buried are widely used. As shown in FIG. 16, for example, an embedding material 1 made of a synthetic resin foam molded article such as expanded polystyrene, preferably having a recessed portion on the back side, is placed on a precast concrete plate 3 provided with truss bars 2. As shown in FIG. 17 or 18, a required number of hollow slab substrates A1 fixed at intervals are placed between the beams B and B of the frame, and a space SS between the embedding materials 1 and 1 is formed. The construction pipe P for equipment is used and the slab upper end reinforcement 4 is laid, and then the hollow slab CS is constructed by placing the cast-in-place concrete C. This hollow slab structure has advantages that it is lightweight and has high rigidity, does not require a small beam in the living room, and can freely plan a plan in the dwelling unit.
[0003]
In the above hollow slab structure, as a measure for the sound insulation performance of the upper and lower floors in the apartment house, as shown in FIG. 19a, a slit 1c is formed by penetrating in the plate thickness direction between the recessed portions 1b formed at predetermined intervals. By fixing an appropriate number of the embedded material 1a (FIG. 19b is a back view thereof) on the precast concrete plate 3 at a predetermined interval and passing the cast-in-place concrete C through the slit 1c to the precast concrete plate 3. There has been proposed an embedding material that is integrated vertically so as to reduce as much as possible the resonance phenomenon with the hollow portion as a unit (see Japanese Patent No. 2601314).
[0004]
[Problems to be solved by the invention]
By constructing the hollow slab using the embedded material having the structure disclosed in the above-mentioned Japanese Patent No. 2601314, the problem of the sound insulation performance on the upper and lower floors in the apartment house has been improved to some extent. However, on the other hand, there is a request to improve the overall living environment to a level that is more comfortable than the conventional standard, and higher levels of sound insulation performance on the upper and lower floors in the apartment are being demanded. However, in a hollow slab structure, improving the sound insulation performance and reducing the weight are contradictory propositions, and in order to obtain a high sound insulation performance (that is, increase the amount of concrete and increase the mass), the hollow ratio should be reduced. It must be lowered.
[0005]
By the way, in the embedding material 1a having the structure disclosed in Japanese Patent No. 2601314, the volume into which the concrete enters is only the slit 1c portion, and there is a limit. Increasing the cross-sectional area of the slit 1c increases the amount of intrusion of the concrete C and can be expected to further improve the sound insulation performance. However, the structural strength of the embedding material decreases, so that it can be fixed to the precast concrete plate during transportation or on site. There is a risk of damage during construction work. As another method, an embedding material having a small horizontal cross-sectional area may be fixed to a precast concrete plate with a wide gap, but the embedding material fixing operation becomes complicated. Therefore, the first object of the present invention is to provide a hollow slab structure with an arbitrary hollow ratio without incurring a structural strength decrease as an embedded material, although the embedded material has substantially the same horizontal cross-sectional area as the conventional one. An object of the present invention is to provide an embedding material that can be reduced to a minimum.
[0006]
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 in the entire area of the floor surface, the weight reduction must be sacrificed. On the other hand, in the residential space of an apartment house, there are areas where floor impact sounds are likely to occur and areas where they are relatively rare. Therefore, by fixing the embedding material that can reduce the hollow ratio in the former area and fixing the conventionally used embedding material in the latter area, the entire floor area of one dwelling unit is made of slabs. It is possible to satisfy both the weight reduction and the sound insulation performance problems 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 in sound insulation performance. It is to provide.
[0007]
[Means for Solving the Problems]
An embedding material for a hollow slab according to the present invention for solving the above-mentioned problems is embedded on a precast concrete plate and embedded in the concrete by a cast-in-place cast concrete to form a hollow slab structure. Basically, on the side of the embedding material facing the precast concrete plate, there is formed a back recess that is convex upward and open in the lateral direction, and the lower end communicates with the back recess. Through-holes are formed in the plate thickness direction, and the cast-in-place concrete to be placed flows through the through-holes and flows into the back surface depression, spreads on the back surface side of the embedded material, and the precast concrete. It is designed to be integrated with the concrete of the board.
[0008]
In addition, a hollow slab substrate according to the present invention for solving the above-described problems is provided by at least a part or all of a plurality of embedding materials fixed on a precast concrete plate of the hollow slab substrate. Is an embedding material in which convex depressions and through holes in the plate thickness direction are formed on the above.
[0009]
In addition, a structure having a hollow slab structure according to the present invention for solving the above-described problems has the hollow slab substrate as a whole or a part of the hollow slab structure substrate, or generates a high floor impact sound. The embedding material in which the convex depression on the top and the through hole in the plate thickness direction are formed is fixed in the region where the above is predicted, and in the other region, the conventional material which does not have at least the through hole is fixed. It is characterized by having a hollow slab structure in which the embedding material is fixed or the embedding material is not fixed and the cast-in-place concrete is cast.
[0010]
According to the embedding material and the substrate for a hollow slab provided with the embedding material according to the present invention, the cast-in-place concrete is formed on the back surface side of the embedding material through the through hole of the embedding material. It penetrates into the depression and easily reaches the back side, and fills the back depression with concrete. Furthermore, the through hole is also filled with concrete. Thereby, in the hollow slab structure to be constructed, the hollow ratio occupied by the embedded material portion is only the volume of the upwardly convex back surface depression (the volume may be arbitrarily determined according to the design conditions) Further, compared with the conventional one, it is further reduced, the rigidity and 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 substantially only reduces the cross-sectional area of the through-hole, and does not cause a significant reduction in strength structurally. Further, the back-side depression that is convex upward also opens in the side surface direction of the embedding material, and the cast-in-place concrete that is placed flows through the opening in the side surface direction. As a result, the fluidity of the cast-in-place concrete into the back surface depression becomes high, the concrete can be reliably filled into the back surface depression without a gap, and a predetermined sound insulation performance can be ensured reliably.
[0012]
The embedding material may preferably have a shape having a chevron shape in which the surface side shape in the cross section is convex upward. In this case, the vibration caused by floor impact on the upper concrete shell part of the concrete slab hollow part is diverged along the curved surface of the upper concrete shell part in the convex chevron-shaped part on the embedded material. As a result, the occurrence of resonance itself is suppressed as compared with the case of using an embedding material having a rectangular cross section in the short direction. Sound insulation performance is further improved.
[0013]
In a preferred embodiment, the surface side of the through hole may have a funnel-shaped inclined surface that extends upward. A recess is also 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 recess. In another preferred embodiment, the back surface of the embedding material may be an inclined surface whose side surface direction is higher, and is a plurality of quadrangular pyramids obtained by cutting a head having four inclined surfaces. It may be. In these aspects, the in-situ concrete can be more surely flowed into the through hole, and the concrete can be put into the surface depression or in the space area between the precast concrete plate surface and the back side of the embedded material. This increases the rigidity and mass of the region, further reducing the resonance phenomenon as much as possible, and further improving the sound insulation performance.
[0014]
As described above, the primary purpose of the hollow slab in the structure is to reduce the weight of the concrete slab. Therefore, when the above-mentioned embedding material capable of reducing the hollowness ratio is embedded in the entire surface of the concrete slab, although the improvement of the sound insulation performance can be expected, the intended purpose as the hollow slab structure is not necessarily achieved. Can also happen. Therefore, in the hollow slab substrate or the structure having a hollow slab structure according to the present invention, at least a part of the embedded materials embedded in the cast-in-place concrete can be used to reduce the above-described hollow ratio. As the material, other embedding materials are conventionally known ordinary embedding materials, which simultaneously satisfy both the problems of weight reduction and improvement of sound insulation performance.
[0015]
In that case, the floor part including the area where the generation of high floor impact noise is predicted such as the area used for living (living room area) such as living room, tea room, bedroom, guest room, reception room, etc. in the living space The above-mentioned embedding material that can reduce the hollow ratio is fixed to ensure sound insulation performance, while other non-residential areas such as kitchens, toilets, bathrooms, storerooms and the like are used for conventional embedding. Fix the material to ensure the required hollowness.
[0016]
In still another embodiment of the hollow slab substrate or the structure having a hollow slab structure according to the present invention, a portion where it is necessary to install a horizontal distribution pipe such as a bathroom, a toilet, or a bathroom is required to have a large floor space. Therefore, the embedding material should not be fixed in the area. As a result, the floor finish surface of the house can be smoothed throughout the dwelling unit, and the arrival of an aging society, for the convenience of elderly people or the use of wheelchairs It is possible to answer the request that the difference in level of the floor finish of the house should be eliminated.
[0017]
In the present invention, as the material for the embedding material, any material can be used as long as it is lightweight and does not deform due to the cast concrete, but a synthetic resin foam molded product such as expanded polystyrene is used. Most preferably used. In addition, a foam such as a styrene resin, a polyolefin resin, a hard urethane resin, a phenol resin, a polyisothiocyanate resin, or an epoxy resin, or a foam obtained by appropriately mixing these resins can be used. The foaming method is arbitrary, and may be appropriately selected according to the shape of 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.
[0018]
The styrene resin may be a polymer having a styrene-based vinyl monomer as a main structural unit such as styrene, methylstyrene, or dimethylstyrene, and the foamed styrene-based resin material is a copolymer containing 50% by weight or more of a styrene-based monomer. Examples of the monomer that is composed of a polymer and can be copolymerized with a styrene monomer include acrylic acid, methacrylic acid, or esters thereof, acrylonitrile, methacrylonitrile, maleic anhydride, and the like.
[0019]
Polyolefin resins include high density polyethylene, low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-carboxylic acid ester copolymer, ethylene-carboxylic acid metal salt copolymer, crystalline polypropylene homopolymer, crystalline propylene. -Ethylene copolymer, crystalline propylene-ethylene-diene terpolymer, and the like.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described 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 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, the embedding material 10 according to the present invention may be fixed on the precast concrete plate (PCa plate) 3 as a whole by a suitable number of 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 portion that is a region where high floor impact sound is expected to be generated in a normal living environment such as a living room / dining room, a Western-style room, a Japanese-style room 10 may be fixed, and a conventional embedding material 1 having a flat surface and a recessed portion on the back surface side may be fixed to other portions.
[0021]
The embedding material 10 has a box shape, and an appropriate number of first back surface grooves 11 in the longitudinal direction convex upward are provided on the back surface side, that is, the side facing the precast concrete plate 3 (in the illustrated case). 2) and the appropriate number of second back surface grooves 12 in the short direction that are also convex upward (in the illustrated case, two in pairs and six in total), and the side surfaces 10a, 10b of the embedding material 10 Are formed so as to cross each other with both ends open. Although not shown, a recessed portion may be formed in a portion where the first and second back surface grooves 11 and 12 are not formed, similarly to the conventional embedded material. The first and second back surface grooves 11 and 12 correspond to back surface depressions in the present invention.
[0022]
Also on the front surface side, at a position facing the first back surface groove 11 and the second back surface groove 12, a first surface groove 13 that is convex downward and a second surface groove 14 that is also convex downward. Are similarly formed. And in each crossing part of each groove | channel, the through-hole 15 which communicates from a surface groove | channel to a back surface groove | channel is formed in the plate | board thickness direction by a suitable number (in the illustration, 12 pieces in total). In addition, it is arbitrary whether the surface grooves 13 and 14 are provided, and one or both of them may be omitted. The first and second surface grooves 13 and 14 correspond to the surface depressions referred to in the present invention.
[0023]
Further, as shown in the figure, in this embedding material 10, cut lines 16 along the short direction are formed along the four circumferences at positions where the whole is roughly divided into three in the longitudinal direction. This cut line 16 is used when constructing a hollow slab, for example, from the condition of piping or when it is desired to construct a hollow slab structure having a higher sound insulation effect, and when it is necessary to use a smaller embedded material. This is used to easily separate and divide one embedding material 10 using the cut line 16. Note that the number of cut lines 16 and the positions to be provided are arbitrary and may be omitted.
[0024]
As with the conventional hollow slab substrate, the embedding material 10 is fixed on the precast concrete plate 3 provided with the truss bars 2 at a predetermined interval to produce the hollow slab substrate A. As shown in FIG. 17, the hollow slab substrate A is mounted in a required number between the beams B and B of the frame, and if necessary, the installation of the equipment piping P, the reinforcement of the slab upper bar 4, etc. After being done, on-site cast concrete C is laid.
[0025]
The cast-in-place concrete C that has been placed passes through the through-hole 15 formed in the embedding material 10 and enters the first back surface groove 11 and the second back surface groove 12 that are convex on the back surface of the embedding material. Flows in. The first back surface groove 11 and the second back surface groove 12 are open at both ends 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 end. Thus, the first back surface groove 11 and the second back surface groove 12 are easily and reliably filled with the cast-in-place concrete C. The cast-in-place concrete C fills the through-hole 15 and the first and second surface grooves 13 and 14, and then forms a concrete layer having a required thickness on the embedding material 10 as shown in FIG. 2. As the concrete hardens, a hollow slab in the required structure is constructed. In the illustrated example, the ceiling surfaces of the first and second back grooves 11 and 12 that are convex upward are shown as flat surfaces, but the vicinity of the center in the longitudinal direction of the ceiling surface protrudes downward. It can also be set as such a ship bottom type | mold, and, thereby, the filling by the cast-in-place concrete C in the said back surface grooves 11 and 12 can be made still more reliable.
[0026]
In the hollow slab structure constructed in this way, the hollow ratio occupied by the embedding material 10 is the first and second back grooves 11 and 12, the through holes 15, and the first and second convexities. The total volume of the surface grooves 13 and 14 is reduced, the rigidity and mass of the portion are increased, and the occurrence of the resonance phenomenon described above can be reduced as much as possible. Sound insulation performance is greatly improved. Further, in the illustrated embedding material 10, the horizontal cross-sectional area is substantially only reduced in the cross-sectional integral of the through-hole 15, and is structurally larger than the conventional embedding material shown in FIG. 16. There is no reduction in strength.
[0027]
There are many other types of implants that can perform 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 recess) 11 that is convex upward on the back surface side. Three surface grooves (surface depressions) 14 that are convex downward are formed on the front surface side, 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. Has been. Thereby, a through hole 15 that communicates the lower end with the back surface groove 11 is substantially formed at the intersection of the back surface groove 11 and the front surface groove 14. In the figure, reference numeral 16 denotes a cut line formed at a position that substantially divides the entire embedding material 10A into three in the longitudinal direction.
[0028]
Also in this embedded material 10 </ b> A, the cast-in-place concrete C flows into the back surface groove 11 through the through hole 15. At the same time, it also flows into the back surface groove 11 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. The surface groove 14 is also filled with the 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 structure 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 reduction in strength structurally.
[0029]
FIG. 4 shows still another embodiment of the embedding material according to the present invention. FIG. 4a is a perspective view, and FIG. 4b is a cross-sectional view taken along the line bb. The embedding material 10B has an appropriate number of back surface depressions 21 (three in the illustrated example) that are convex upward on the back surface side, and each back surface depression 21 is formed on the side surface 10a, 10b of the embedding material 10B. , Each having an open end 22. A through-hole 15 extending to the surface of the embedding material 10B is formed at the center of the ceiling of each backside recess 21. The surface side of the through-hole 15 is a funnel-shaped inclined surface 15a that expands upward. In the figure, reference numeral 16 denotes a cut line formed at a position that substantially divides the entire embedding material 10B into three in the longitudinal direction.
[0030]
Also in this embedded material 10 </ b> B, the cast-in-place concrete C flows into the back surface recess 21 through the through-hole 15, and also flows into the back surface recess 21 through the side surface open end 22 of the back surface recess 21. Thereby, the inside of the back surface depression 21 is filled with the cast-in-place concrete C easily and reliably. In particular, the front surface side of the through-hole 15 is a funnel-shaped inclined surface 15a that expands upward, and ensures that the cast-in-place concrete C flows into the back surface depression 21. The portion of the through hole 15 is also filled with the cast-in-place concrete C as in the 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 structure is improved. In addition, although the strength of the embedding material 10B hardly deteriorates, the area of the back surface depression 21 facing the precast concrete plate 3 can be made larger than that of the other structure, The rigidity and mass of the area further increase.
[0031]
FIG. 5 shows still another embodiment of the embedding material according to the present invention. FIG. 5a shows a perspective view and FIG. 5b shows a perspective view seen from the back side. The embedding material 10 </ b> C has one convex back groove (back recess) 11 extending in the longitudinal direction on the back surface side, and is convex downward at a position facing the back surface groove 11 on the front surface side. One surface groove (surface depression) 13 in the longitudinal direction and three surface grooves (surface depressions) 14 in the short direction that are convex downward in a direction orthogonal to the surface groove 13 are formed. Further, this embedding material 10C has a ship-bottom cross section in the short direction. As shown in the figure, the entire back surface has the bottom surface groove portion 11 at the lowest position, and both sides thereof have longitudinal side surfaces 10b. It is set as the inclined surfaces 31 and 31 which rise toward. The inclined surfaces 31, 31 are provided with legs 32 for the purpose of stabilizing the posture when the embedded material 10 </ b> C is placed on the precast concrete plate 3. The legs 32 may be omitted.
[0032]
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, and a side edge portion in the vicinity of the lower end portion of the through hole 15 in the back surface groove 11 is convex upward. A notch 33 is provided. Further, an appropriate number of through-holes 15 b that pass through the inclined surfaces 31, 31 are also formed in the surface grooves 14 in the short direction. In the figure, reference numeral 16 denotes a cut line formed at a position where the entire embedding material 10C is substantially divided into three in the longitudinal direction.
[0033]
In this embedding material 10C, the cast-in-place concrete C flows into the back surface groove 11 through the through hole 15, and through the through hole 15b, the back inclined surfaces 31, 31 and the precast concrete of the embedding material 10C. It also flows between the surfaces of the plates 3. Further, the cast-in-place concrete C flows into the back-surface groove 11 from the side open end of the back-surface groove 11, and the cast-in-place concrete C also flows in the notch 33 portion. The cast-in-place concrete C flows into the space between the back inclined surfaces 31 and 31 of the embedded material 10C and the surface of the precast concrete plate 3 also from the outside. Furthermore, the surface grooves 13, 14 are also filled with cast-in-place concrete C.
[0034]
In the hollow slab structure using the embedding material 10C, the space area between the surface of the precast concrete plate 3 and the back inclined surfaces 31 and 31 of the embedding material 10C can be filled with the cast-in-place concrete C as described above. Therefore, compared with the embedding material having a flat bottom surface, the hollow ratio of the portion occupied by the embedding material 10C can be further reduced, and the rigidity and mass of the region can be further increased. The sound insulation performance of the hollow slab is improved. The horizontal cross-sectional area of the embedding material 10C substantially only reduces the cross-sectional integral of the through holes 15 and 15b, and the structural strength is hardly lowered.
[0035]
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 side. The surface of the embedding material 10D is the same as that of the embedding material 10C shown in FIG. 5, and there is one longitudinal surface groove 13 projecting downward and a direction perpendicular to the surface groove 13. In addition, three surface grooves 14 in the short direction that are convex downward are formed. A cut line 16 is formed at a position that substantially divides the entire embedding material 10D into three in the longitudinal direction, and the back surface side of the embedding material 10D has a head portion for each block defined by the cut line 16. Each of them has four inclined surfaces 41. In each quadrangular pyramid portion, an upwardly protruding back surface groove (back surface recess) 11 and a short side extending in the longitudinal direction are provided at positions facing the longitudinal surface groove 13 and the short surface groove 14 formed on the surface. An upwardly convex back surface groove (back surface recess) 12 extending in the direction is formed in a cross shape. Further, an appropriate number of through-holes 15 are formed in the surface groove 13 in the longitudinal direction so as to pass through the back-surface groove 11, and an appropriate number of through-holes 15 b that pass through the back-surface groove 12 also in the surface groove 14 in each lateral direction. Is formed.
[0036]
In the embedded material 10D, the cast-in-place concrete C flows into the back surface grooves 11 and 12 through the through holes 15 and the through holes 15b. On the other hand, the cast-in-place concrete C also flows into the space between the inclined surfaces 41 on the back surface of the embedding material 10 </ b> D and the surface of the precast concrete plate 3, and then passes through the side surface opening portions of the back surface grooves 11 and 12. Into the backside grooves 11 and 12. Furthermore, the through hole and the surface groove portion are also filled with the cast-in-place concrete C.
[0037]
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 the cast-in-place concrete C. Compared with the embedding material 10C shown in FIG. 5, the hollow ratio of the portion occupied by the embedding material 10D can be further reduced, and the sound insulation performance of the hollow slab in the structure is reliably improved. Similarly to the other embodiments described above, the horizontal cross-sectional area of the embedding material 10D substantially only reduces the cross-sectional integral of the through holes 15 and 15b, and hardly reduces the structural strength.
[0038]
In order to fix the embedding material 10 to 10D on the surface of the precast concrete plate 3, for example, as shown in Japanese Patent Publication No. 57-47008, fixing may be performed. As shown in Japanese Patent No. -138018, fixing may be performed by forming a convex portion on the back surface of the embedding material and pressing the convex portion, or fixing with an adhesive or an adhesive tape. The embedding materials 10 to 10D can also be fixed in a state of being floated from the surface of the precast concrete plate 3 on the condition that a predetermined cover is taken between the surface of the embedding material and the slab upper end reinforcement 4. In that case, the cast-in-place concrete C enters the entire back surface side of the embedding materials 10 to 10D, and a hollow slab structure having higher sound insulation performance can be obtained. FIG. 7 shows an example of the fixing mode of the embedding material in such a case. Here, the embedding material is fixed using the embedding material support 50.
[0039]
That is, when the precast concrete board 3 is manufactured, the embedding material support 50 having a shape that can hold the back surface (back surface) of the embedding material to be fixed thereon in a stable posture is provided. And then, the embedding material is fixed thereon by an appropriate means. The illustrated one is an example in the case of using the embedding material 10C (here, the legs 32 are omitted) having the bottom surface of the cross-section ship bottom shown in FIG. It is set as the shape bent in M shape so that the back surface inclined surfaces 31 and 31 on either side of the insert 10C may be followed. 7 is merely an example, and as described above, the embedding material support 50 floats in a stable posture on the back side (back side) of the embedding material to be fixed thereon. Any material can be used as long as it can be held in a wet state, and an appropriate shape may be used depending on the shape of the embedding material to be used.
[0040]
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 necessary, whereas FIG. The embedding material shown in FIG. 13 has at least a portion in which the shape on the surface side in the cross section forms an upwardly convex chevron shape.
[0041]
For example, the embedding material 200 shown in FIG. 8 has a box shape as a whole, but the surface side has a shape in which a plurality of (in the figure, four) ridges 201 forming a mountain shape are arranged in parallel in the longitudinal direction. A plurality of (three in the figure) concave grooves 214 are formed so as to be orthogonal to the four ridges 201. Then, a rear surface groove 211 that is convex upward is formed in parallel with the concave groove 214 at a position corresponding to the concave groove 214 on the rear surface side, and the rear surface groove 211 is formed on the side surfaces 200 a and 200 b of the embedding material 200. Both ends are open. Although not shown, a recessed portion may be formed in a portion where the back surface groove 211 is not formed in the same manner as a conventional embedded material. In addition, this back surface groove | channel 211 is corresponded to the back surface hollow said by this invention.
[0042]
Further, an appropriate number of through-holes 215 communicating with the concave groove 214 and the back surface groove 211 (4 × 3 in the illustrated case, 12 in total) are formed in the plate thickness direction, and the ridge 201 and the ridge 201 An appropriate number of through-holes 215a (four in the illustrated case only in the central depression) are also formed in the depressions between them. In addition, the hollow between the said protruding item | line 201 and the protruding item | line 201 is corresponded also to the surface depression said by this invention.
[0043]
As in the case of the embedding materials 10 to 10D shown in FIGS. 1 to 7, the embedding material 200 is fixed at a predetermined interval on the precast concrete plate 3 provided with the truss bars 2, and is a hollow slab substrate. A is manufactured. And the hollow slab in a required structure is constructed | assembled as shown in FIG. 9 using this board | substrate A for hollow slabs. At that time, the cast-in-place concrete C that has been cast flows through the through holes 215 and 215a formed in the embedding material 200 into the back surface groove 211 that is convex above the back surface of the embedding material, The cast-in-place concrete C flows from the open end of the back surface groove 211 into the back surface groove as in the case of the embedding materials 10 to 10D shown in FIGS.
[0044]
Furthermore, in the hollow slab structure constructed by using the hollow slab substrate A to which the above-described embedding material 200 is fixed, the upper portion formed on the upper surface of the ridge 201 having a mountain shape on the surface of the embedding material 200. The vibration generated by the floor impact on the concrete shell portion is radiated and attenuated along the curved surface along the upper surface of the ridge 201 of the concrete shell portion, and the bending generated in the concrete shell portion is flat on the conventional surface. Smaller than some embedding materials. Thereby, the occurrence of resonance related to the presence of the hollow portion in the hollow slab is suppressed, and the sound insulation performance as the hollow slab is further greatly improved.
[0045]
An embedding material 200A shown in FIG. 10 is a ridge 250 having a convex chevron shape on the back surface side of the ridge shape 201 forming the chevron shape in the above-described embedding material 200. The structure is different from that of the embedding material 200 in that a gap 251 is formed between the front surface and 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 is constructed using a hollow slab substrate A to which the embedding material 200A is fixed. In the slab structure, the vibration generated by receiving a floor impact on the upper concrete shell portion formed on the upper surface of the ridge 201 having a mountain shape on the surface of the embedding material 200A is similar to the case of the embedding material 200. The concrete shell portion is radiated and attenuated along the curved surface along the upper surface of the ridge 201, and the occurrence of resonance related to the presence of the hollow portion in the hollow slab is suppressed.
[0046]
The embedding material 200B shown in FIG. 11 has a shape in which a plurality of cylindrical bodies 260 are formed as a whole (two in the figure are shown, but the number is arbitrary) and are integrally formed adjacently. Each cylinder 260 is formed with an appropriate number of through-holes 215 penetrating from the front surface to the rear surface (three in the figure), and an appropriate number of through-holes 215a are also formed on the joint surfaces of the cylinders 260. (4 in the figure) are formed. Furthermore, a back surface groove 211 that is convex upward is formed at a position on the back surface side corresponding to the location where the through-hole 215 is formed, in a direction perpendicular to the axial center line of the cylindrical body 260. The back surface groove 211 is open at both ends to the side surfaces 200a and 200b of the embedding material 200B. It will not be necessary to explain that this embedment 200B has the same function as the embedment 200 or 200A.
[0047]
An embedding material 200 </ b> C shown in FIG. 12 has an appropriate number of through-holes 215 (three in the figure) penetrating from the front surface to the back surface of one cylindrical tube 260, and the through-hole 215. A back groove 211 that is convex upward is formed in a direction perpendicular to the axial center line of the cylindrical body 260 on the back surface side corresponding to the location where the is formed. The embedding material 200D shown in FIG. 13 is different from the embedding material 200C shown in FIG. 12 in that the cross-sectional shape of the cylindrical body 260 is not circular but is oval, and the other shapes are the same. Also in the case of these embedding materials, the hollow slab substrate A is fixed to the precast concrete plate 3 provided with the truss bars 2 at a predetermined interval in the same manner as the embedding material 200 or 200A. It is not necessary to explain that the slab is manufactured and that these embedments can perform the same functions as the other embedments described above in the hollow slab constructed using the hollow slab substrate A. Will.
[0048]
Next, an example in the case of constructing an actual building hollow slab using the 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 slab surface view showing a state before the cast-in-place concrete C is placed. As described above with reference to FIG. 17, the required number of hollow slab substrates A (in this example, as shown in FIG. 15, 5 sheets) between the beams of the frame (not shown in FIGS. 14 and 15). A1 to A5) After being placed and cast on-site concrete to form a hollow slab structure, a living space is constructed with a floor plan as shown in FIG.
[0049]
In the example shown in FIG. 14, the living room / dining room and the Japanese-style room are on the veranda side, the western room 1 and the kitchen are inside, and the western room 2 and the bathroom, the bathroom dressing room, The entrance is arranged. In the living space as described above, living rooms such as living room / dining room, Western-style room, Japanese-style room, etc. are areas where high floor impact noise is expected to occur in normal living conditions due to jumping and running sounds of children. On the other hand, non-residential rooms such as kitchens, bathrooms, wash-dressing rooms, and entrances can be said to be areas where high floor impact noise is unlikely to occur compared to living / dining rooms, western rooms, Japanese-style rooms, and the like.
[0050]
Therefore, as the hollow slab substrates A1 and A2 attached to the area serving as the living room / dining room and the Japanese-style room, the embedding material (10 to 10D, 200 to 200D) that can reduce the hollow ratio according to the present invention (indicated by hatching) One of the above is 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, the embedding material (10 to 10D, 200 to 200D) (in hatching) that can reduce the hollowness ratio in the region where the western room 1 and the western room 2 are located and the vicinity thereof. Any other area (kitchen, bathroom, bathroom undressing room, non-residential room part that becomes a front door, etc.) that has been fixed to any of the above-mentioned embedding material has not been taken By using the fixed hollow slab substrate, the sound insulation performance is partially ensured and the necessary hollowness is also ensured.
[0051]
Although not shown in the figure, parts that require horizontal installation of water pipes, such as bathrooms, toilets, and washrooms, are places where large floors are required. You may make it place cast-in-place concrete without arranging itself. Thereby, the floor finish surface of a house can be made smooth over the inside of a dwelling unit, and the height difference of the floor finish surface of a house can be eliminated for the safety | security of elderly people or the convenience of using a wheelchair.
[0052]
【The invention's effect】
As can be seen from the above description, according to the present invention, the hollowness ratio of the hollow slab structure can be easily and surely reduced without causing a decrease in structural strength while having the same horizontal cross-sectional area as that of the prior art. An embedding material and a hollow slab substrate having the embedding material are obtained. In addition, by using the embedding material according to the present invention or the substrate for a hollow slab having the embedding material, the entire floor area of one dwelling unit can satisfy both the problems of weight reduction and improvement in sound insulation performance at the same time. A structure having a hollow slab structure can be easily constructed.
[Brief description of the drawings]
FIG. 1 illustrates 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.
FIGS. 3A and 3B are diagrams illustrating another embodiment of an embedding material according to the present invention, FIG. 3A being a perspective view, and FIG. 3B being a cross-sectional view taken along the line bb of FIG. 3A.
FIGS. 4A and 4B are views for explaining still another embodiment of the embedding material according to the present invention, FIG. 4A is a perspective view, and FIG. 4B is a cross-sectional view taken along the line bb in FIG. 4A.
FIGS. 5A and 5B are views for explaining 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 as seen from the back side.
6A and 6B are views for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 6a shows a perspective view and FIG. 6b shows a perspective view seen from the back side.
FIG. 7 is a view for explaining an embodiment of a fixing mode of an embedding material to a precast concrete board according to the present invention, in which fixing is performed using an embedding material support.
8A and 8B are views for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 8a is a perspective view, FIG. 8b is a side view, and FIG. 8c is a cross-sectional view taken along the line cc of FIG. The figure is shown.
9 is a cross-sectional view illustrating a hollow slab structure constructed using the hollow slab substrate shown in FIG.
10A and 10B are diagrams for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 10a is a perspective view, FIG. 10b is a side view, and FIG. 10c is a cross-sectional view taken along line cc of FIG. The figure is shown.
11A and 11B are views for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 11a is a perspective view, FIG. 11b is a side view, and FIG. 11c is a line cc and d in FIG. Sectional drawing by -d line is shown.
12A and 12B are diagrams for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 12a is a perspective view, FIG. 12b is a side view, and FIG. 12c is a cross-sectional view taken along the line cc of FIG. The figure is shown.
13A and 13B are diagrams for explaining still another embodiment of an embedding material according to the present invention, in which FIG. 13a is a perspective view, FIG. 13b is a side view, and FIG. 13c is a cross-sectional view taken along the line cc of FIG. The figure is shown.
FIG. 14 is a plan view showing an example of a floor plan of an apartment house.
15 is a slab surface view of the floor plan shown in FIG.
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 for explaining 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 having another shape according to the prior art, and FIG. 19b 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 plate (PCa plate), 10-10D, 200-200D ... Embedded material, 11, 12 ... On the back side of the embedded material Grooves that are convex and open in the lateral direction (recessed recesses), 13, 14... Recessed grooves (surface recesses) formed on the surface side of the embedding material, 15... Implant support

Claims (8)

An embedding material that is fixed on a precast concrete plate and embedded in the concrete by a cast-in-place concrete to form a hollow slab structure,
On the side of the embedding material facing the precast concrete board, there is formed a back recess that is convex upward and open in the lateral direction, and is also convex downward on the opposite side and open in the lateral direction. Surface depressions are formed ,
Further, through-holes communicating the upper end in the recess the surface communicating lower end to the back recess be formed in a thickness direction,
The cast-in-place concrete to be placed flows through the through-hole into the back surface depression, spreads on the back surface side of the embedded material, and is integrated with the concrete of the precast concrete plate. An embedding material characterized by The embedding material has a portion in which the surface side shape in the cross section has a convex chevron shape, and the convex chevron-shaped portion is formed in a plurality of rows in parallel. The embedding material according to claim 1, wherein a space penetrating in the vertical direction is formed in at least a part of the space .   The embedding material according to claim 1, wherein the back surface of the embedding material is an inclined surface having a side surface on the upper side.   The embedding material according to claim 3, wherein the inclined surface includes a leg. An embedding material that is fixed on a precast concrete plate and embedded in the concrete by a cast-in-place concrete to form a hollow slab structure,
On the side of the embedding material facing the precast concrete plate, there is formed a back recess that is convex upward and open in the side direction, and further, a through hole that communicates the lower end with the back recess is formed in the thickness direction. And the back side of the embedding material is a plurality of quadrangular pyramids obtained by excising a head having four inclined surfaces,
The cast-in-place concrete to be placed flows through the through-hole into the back surface depression, spreads on the back surface side of the embedded material, and is integrated with the concrete of the precast concrete plate. An embedding material characterized by   The embedding material according to claim 5, wherein the inclined surface includes a leg.   The embedding material according to any one of claims 1 to 6, wherein the embedding material includes a cut line that divides the whole in a longitudinal direction.   A hollow slab substrate in which a plurality of embedding materials are fixed on a precast concrete board, wherein at least a part or all of the embedding materials of the plurality of embedding materials are the above-described claims. A hollow slab substrate, which is any one of the embedding materials.

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