JP2004150270A - Embedding material for void slab, base plate for void slab having embedding material, and construction having void slab structure with fixed embedding material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embedding material and a base plate for a void slab having the embedding material which has a horizontal cross-sectional area substantially equal to that in the prior art and can easily and surely reduces a void ratio of a void slab structure without reducing structural strength. <P>SOLUTION: A reverse face recess 11 is formed in the reverse face of the embedding material 10A in an upward direction, and an obverse face recess 14 is formed in the obverse face of the embedding material in a downward direction in a manner that the reverse face recess 11 and the obverse face recess 14 intersect with each other. The two recesses 11 and 14 have the depths to form a through hole 15 at an intersection of the two recesses. The embedding material 10A is fixed onto a precast concrete plate 3 to form the base plate A for the void slab. When cast-in-place concrete C is placed in a construction field, the cast-in-place concrete passes through the through hole 15 and easily fills the reverse face recess 11. In addition, since the obverse face recess 14 is also filled with the concrete, sound insulation performance of the void slab is also improved surely. <P>COPYRIGHT: (C)2004,JPO

Description

  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.

  The floor structure of a recent concrete apartment house is to fix a lightweight embedding material on a precast concrete board (PCa board), and then cast in-place concrete from above and place the embedding material in the in-place concrete. A hollow slab structure to be buried is widely used. As shown in FIG. 16, for example, an embedding material 1 made of a synthetic resin foam molded product such as expanded polystyrene and preferably having a concave portion on the back side is placed on a precast concrete plate 3 provided with truss bars 2. As shown in FIG. 17 or FIG. 18, a required number of hollow slab substrates A1 fixed at intervals are mounted between the beams B of the skeleton, and the space SS between the embedding materials 1 and 1, and the like. The hollow slab CS is constructed by casting the in-place concrete C after performing the installation of the equipment pipe P by utilizing it and the arrangement of the top slab 4 of the slab. 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 allows free planning of dwelling units.

  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 1c is formed in the thickness direction between recessed portions 1b formed at predetermined intervals. The embedding material 1a (FIG. 19b is a rear view) is fixed on the precast concrete plate 3 at a predetermined interval at a predetermined interval, and the cast-in-place concrete C is passed through the slit 1c to the precast concrete plate 3. An embedding material has been proposed which is vertically integrated so as to reduce resonance phenomena in hollow units as much as possible.

Japanese Patent No. 2601314

  By constructing the hollow slab using the embedded material having the structure disclosed in Patent Document 1, the problem of the sound insulation performance on the upper and lower floors of 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 conventional standards, and a higher level of sound insulation performance on the upper and lower floors of an apartment complex is being demanded. However, in the hollow slab structure, improving the sound insulation performance and reducing the weight are contradictory propositions. In order to obtain high sound insulation performance (that is, increase the amount of concrete and increase the mass), the hollow ratio must be increased. I have to lower it.

  By the way, in the embedding material 1a of the structure disclosed in the above-mentioned Patent Document 1, the volume where 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 that penetrates, and can further improve the sound insulation performance. However, the structural strength of the embedded material decreases, and the material is fixed during transportation or on precast concrete plates. It may be damaged 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. Therefore, a first object of the present invention is to provide an embedded material having substantially the same horizontal cross-sectional area as the conventional one, but to make the hollow slab structure have an arbitrary hollow ratio without reducing the structural strength of the embedded material. 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, weight reduction has to be sacrificed. On the other hand, in the living space of an apartment house, there are an area where floor impact noise is likely to be generated and an area where floor impact noise is relatively rarely generated. 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 entire floor area of a single dwelling unit is It is possible to simultaneously satisfy both the problem of light weight and the problem of the sound insulation performance of the upper and lower floors. 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.

  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 embedded in the concrete by cast-in-place concrete to form a hollow slab structure. Basically, on the side of the embedding material facing the precast concrete plate, there is formed a backside depression which is convex upward and is open in the side direction, and further has a lower end communicating with the backside depression. The through-hole is formed in the plate thickness direction, and the cast-in-place concrete casts through the through-hole, flows into the backside depression, spreads to the backside of the embedding material, and It is characterized by being integrated with the concrete of the plate.

  Further, the hollow slab substrate according to the present invention for solving the above-mentioned problems includes 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 the above-mentioned convex recess and a 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 the whole or a part of the substrate of the hollow slab structure, or generates a high floor impact sound. An embedding material having the above-described upwardly projecting backside dent and a through-hole in the thickness direction is fixed in a region where is predicted, and a conventional region not having at least the through-hole is provided in other regions. It is characterized by having a hollow slab structure in which an 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, the cast-in-place concrete has an upwardly convex back surface formed on the back surface side of the embedding material through the through hole of the embedding material. It penetrates into the depression, easily reaches the back side, and fills the backside depression with concrete. Furthermore, the through holes are also filled with concrete. Accordingly, 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.

  In the embedding material according to the present invention, the horizontal cross-sectional area of the embedding material is substantially reduced only in terms of the cross-sectional integral of the through-hole, and does not cause a large structural decrease. 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 concrete can be reliably filled into the backside depression without gaps, and a predetermined sound insulation performance can be reliably ensured.

  Preferably, the embedding material may have a shape in which a surface side shape in a cross section has an upwardly convex mountain 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 attenuates and reduces the deflection generated in the concrete shell portion, as a result, compared to the case of using an embedding material having a rectangular cross section in the short direction, the occurrence of resonance itself is suppressed, The sound insulation performance is further improved.

  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 aspect, the back surface of the embedding material may be an inclined surface in which a side surface direction is higher, or a plurality of quadrangular pyramids whose heads having four inclined surfaces are cut off. May be. In these aspects, the inflow of cast-in-place concrete into the through hole is further ensured, and the concrete is also placed in the surface depression or in the space region between the surface of the precast concrete plate and the back side of the embedding material. And the rigidity and mass of the region increase, so that 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 burial materials buried by cast-in-place concrete can reduce the above-mentioned hollow ratio by embedding. 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, the floor portion including an area where high floor impact noise is expected to occur, 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 order to secure sound insulation performance by fixing the above-mentioned embedding material that can reduce the hollow ratio, on the other hand, in the non-living areas such as kitchens, toilets, bathrooms, sheds, etc. Fix the 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 which needs to be installed horizontally by distributing a water pipe such as a bathroom, a toilet, a vanity room requires a large floor space. Therefore, the embedding material is not fixed in the area. By doing so, the floor surface of the house can be made smooth over the dwelling units as a result, and with the advent of an aging society, for the safety of the elderly or the convenience of using a wheelchair, It can answer the demand to eliminate the difference in elevation of the floor surface of the house.

  In the present invention, as the material of the embedding material, any material can be used on condition that it is lightweight and is not deformed by the concrete to be cast, but a synthetic resin foam molded article such as expanded polystyrene is used. 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, and the expanded styrene-based resin material may be a polymer containing at least 50% by weight of a styrene-based monomer. Monomers composed of a polymer and copolymerizable with a styrene-based monomer include acrylic acid, methacrylic acid, or esters thereof, acrylonitrile, methacrylonitrile, maleic anhydride, and the like.

  Examples of polyolefin resins include high-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-carboxylate ester copolymer, ethylene-carboxylate metal salt copolymer, crystalline polypropylene homopolymer, and crystalline propylene. -Ethylene copolymer, crystalline propylene-ethylene-diene terpolymer and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the embedding material which can reduce easily the hollow rate of a hollow slab structure easily and reliably, without causing a structural strength fall although it has substantially the same horizontal cross-sectional area as the conventional one, and the said embedding A substrate for a hollow slab having a material is 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 structure having a hollow slab structure can be easily constructed.

  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 shows 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 to 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. The fixing material 10 may be fixed, and the conventional embedding material 1 having a flat surface and a concave portion on the back surface may be fixed to another portion.

  The embedding material 10 is box-shaped, and on the back side, that is, the side facing the precast concrete plate 3, an appropriate number of first back grooves 11 in the longitudinal direction that are upwardly convex (in the illustrated example). 2) and an appropriate number of second backside grooves 12 in the short direction, which is also convex upward (in the illustrated example, two pairs constitute a total of six), 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 concave portion 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. The first and second backside grooves 11 and 12 correspond to the backside depression according to the present invention.

  Also on the front surface side, a first surface groove 13 that is convex downward and a second surface groove 14 that is also convex downward at positions facing the first back surface groove 11 and the second back surface groove 12. Are similarly formed. 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. Note that the first and second surface grooves 13 and 14 correspond to surface depressions according to the present invention.

  Further, as shown in the figure, in the embedding material 10, cut lines 16 are formed along the circumference in 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 of the cut lines 16 are arbitrary and may be omitted.

  The embedding material 10 is fixed on the precast concrete plate 3 provided with the truss bars 2 at predetermined intervals at an appropriate number of times, similarly to the conventional hollow slab substrate, and the 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 piping P for the equipment and the arrangement of the reinforcing bars of the upper 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 the through hole 15 formed in the embedding material 10 and into 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 in. 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. Thereby, 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. After the cast-in-place concrete C has also filled the through holes 15 and the first and second surface grooves 13 and 14, a concrete layer having a required thickness is formed on the embedding material 10 as shown in FIG. As the concrete hardens, the hollow slab in the required construction is built. 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 in this manner, the hollow ratio occupied by the embedding material 10 is such that the upwardly projecting first and second backside grooves 11 and 12, the through hole 15, and the first and second Is reduced by the sum of the volumes of the surface grooves 13 and 14, 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. Sound insulation performance is greatly improved. Further, in the embedding material 10 shown in the drawing, the horizontal cross-sectional area thereof is substantially reduced only in the integral of the cross section of the through hole 15, and is structurally larger than that of the conventional embedding material shown in FIG. No reduction in strength occurs.

  There are many other forms of the embedding material that can fulfill the functions described above. 3A is a perspective view, and FIG. 3B is a cross-sectional view taken along the line bb. The embedding material 10A has one longitudinal back surface groove (back surface depression) 11 that is convex upward on the back surface side. On the front side, three surface grooves (surface depressions) 14 that are convex downward 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. Have been. 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, reference numeral 16 denotes 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 surface 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 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 shows a perspective view, and FIG. 4b shows a cross-sectional view taken along line bb. 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 at the center of the ceiling of each back surface depression 21 so as to pass through the surface of the embedding material 10B. 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 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 back surface dent 21 through the through hole 15 and also flows into the back surface dent 21 through the side open end 22 of the back surface dent 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 portion of 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 as viewed from the back. The embedding material 10C has a single upwardly projecting back surface groove (back surface depression) 11 extending in the longitudinal direction on the back surface side, and is convex downward on the front surface at a position facing the back surface groove 11. One surface groove (surface depression) 13 in the longitudinal direction and three surface grooves (surface depressions) in the short direction which are convex downward in a direction perpendicular to the surface groove 13 are formed. The embedding material 10C has a cross section in the short 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 longitudinal surface groove 13 so as to pass through the back surface groove 11, and a side edge portion of the back surface groove 11 near the lower end of the through hole 15 is upwardly convex. Notch 33 is provided. In addition, an appropriate number of through holes 15b are formed in the surface grooves 14 in the respective lateral directions so as to pass through the inclined surfaces 31, 31. In the drawing, reference numeral 16 denotes a score line formed at a position where the entire embedding material 10C is substantially divided into three in the longitudinal direction.

  In the embedding material 10C, the cast-in-place concrete C flows into the back surface groove 11 through the through hole 15 and the back inclined surfaces 31, 31 of the embedding material 10C and the precast concrete C through the through hole 15b. It also flows between the surfaces of the plate 3. Further, the cast-in-place concrete C flows into the back surface groove 11 also from the side open end of the back surface groove 11, and the cast-in-place concrete C flows also in the notch 33. The cast-in-place concrete C flows into the space between the back inclined surfaces 31 and 31 of the embedding material 10C and the surface of the precast concrete plate 3 also from the 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 region between the surface of the precast concrete plate 3 and the rear inclined surfaces 31, 31 of the embedding material 10C can be filled with the cast-in-place concrete C. Therefore, as compared with an embedding material having a flat bottom surface, the hollow ratio of a 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 surely improved. In the horizontal cross-sectional area of the embedding material 10C, only the cross-sectional integral of the through holes 15 and 15b is substantially reduced, and structural strength is hardly reduced.

  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. The embedding material 10D has the same surface-side shape as the embedding material 10C shown in FIG. 5, and has one longitudinally extending surface groove 13 protruding downward and a direction orthogonal to the surface groove 13. In the figure, three short surface grooves 14 projecting downward 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. A back surface of the embedding material 10D has a head portion for each block partitioned by the cut line 16. Are cut off, each having four inclined surfaces 41. In each quadrangular pyramid portion, an upper convex back surface groove (rear surface recess) 11 extending in the longitudinal direction and a short surface are provided at positions facing the longitudinal surface groove 13 and the lateral surface groove 14 formed on the surface. An upwardly convex back surface groove (back surface depression) 12 extending in the direction is formed in a cross shape. 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. Is formed.

  In the embedding material 10D, the cast-in-place concrete C flows into the backside grooves 11 and 12 through the through holes 15 and the through holes 15b. On the other hand, the cast-in-place concrete C flows into the space between each inclined surface 41 on the back surface of the embedding material 10D and the surface of the precast concrete plate 3 from the outside, and from there, passes through the side opening portions of the back grooves 11 and 12. Flow into the back surface grooves 11 and 12. 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 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 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 by using a locking tool as shown in Japanese Patent Publication No. 57-47008. As shown in JP-A-138018 or the like, fixing may be performed by forming a convex portion on the back surface of the embedding material and pressing the convex portion, or may be fixed with an adhesive or an adhesive tape. Further, 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 4 of the slab. In that 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, when manufacturing the precast concrete plate 3, the embedding material support 50 having such a shape that the back surface (back surface) of the embedding material to be fixed thereon can be held in a stable posture. 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. It is a shape that is bent in an M-shape along the left and right rear inclined surfaces 31, 31 of the filling material 10C. 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 has a plurality of (four in the figure) mountain-shaped ridges 201 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. Then, 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 is formed on the side surfaces 200 a and 200 b of the embedding material 200. Both ends are open. 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 is equivalent to the back surface depression in the present invention.

  Further, an appropriate number of through holes 215 (4 × 3 in the figure, 12 in total) communicating with the concave groove 214 and the back surface groove 211 are formed in the plate thickness direction. A suitable number of through-holes 215a (from the front side to the back side) are formed in the recesses between them (in the illustrated case, only four holes are provided only in the central recessed portion). The dent between the ridges 201 also corresponds to the surface dent 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. A is manufactured. Then, a hollow slab of a required structure is constructed using the substrate for hollow slab A 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 and flows into the back surface groove 211 that is convex on 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, similarly to the case of the embedding materials 10 to 10D shown in FIGS. 1 to 7.

  Furthermore, in the hollow slab structure constructed using the hollow slab substrate A on which the embedding material 200 is fixed, the upper part formed on the upper surface of the convex ridge 201 having a mountain shape on the surface of the embedding material 200. The vibration caused by the floor impact on the concrete shell portion is dissipated and attenuated along the curved surface along the upper surface of the ridge 201 of the concrete shell portion, and the deflection generated on the concrete shell portion is a conventional surface having a flat surface. Smaller than some implants. 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.

  An embedding material 200A shown in FIG. 10 has a convex shape 250 in which the back side of the convex shape 201 in the embedding material 200 is also convex downward, and the convex shape 201 and the convex shape 201 are also formed. Is different from the embedding material 200 in that a gap 251 is formed between the 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 a hollow constructed using the hollow slab substrate A on which the embedding material 200A is fixed. In the slab structure, the vibration caused by the floor impact on the upper concrete shell portion formed on the upper surface of the ridge 201 having the shape of the chevron on the surface of the embedding material 200A is similar to the case of the embedding material 200, It escapes and attenuates along the curved surface along the upper surface of the ridge 201 of the concrete shell portion, and the occurrence of resonance related to the existence of the hollow portion in the hollow slab is suppressed.

  The embedding material 200B shown in FIG. 11 has a shape in which a plurality of cylindrical bodies 260 as a whole (two in the figure are shown, but the number is arbitrary), and they are integrally formed adjacently. In each cylinder 260, an appropriate number of through holes 215 (three in the drawing) penetrating from the front surface to the back surface are formed, and an appropriate number of through holes 215a are also formed in the joint surface between the cylinders 260. (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 that is upwardly convex is formed in a direction perpendicular to the axis of the cylindrical body 260. Both ends of the back surface groove 211 are open to the side surfaces 200a and 200b of the embedding material 200B. It is unnecessary to explain that the embedding material 200B also has the same function as the embedding material 200 or 200A.

  The embedding material 200C shown in FIG. 12 is formed with a proper number (three in the figure) of through-holes 215 penetrating from a front surface to a back surface in one cylindrical tubular body 260, and the through-holes 215 are formed. On the back surface side corresponding to the position where is formed, a back surface groove 211 that is upwardly convex is formed in a direction perpendicular to the axis of the cylindrical body 260. The embedding material 200D shown in FIG. 13 differs from the embedding material 200C shown in FIG. 12 in that the cross-sectional shape of the cylindrical body 260 is not circular but elliptical, and the other shapes are the same. In the case of these embedding materials as well, in the same manner as the embedding material 200 or 200A, the hollow slab substrate A is fixed at a predetermined interval on the precast concrete plate 3 having the truss bars 2 at predetermined intervals. It is not necessary to explain that, in the hollow slab constructed using the substrate for hollow slab A, these embedding materials can exhibit the same function as the above-mentioned other embedding materials. Will.

  Next, an example in which a hollow slab of an actual building is constructed by using the hollow slab substrate A on 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 previously described with reference to FIG. 17, the required number of hollow slab substrates A is provided between the beams of the skeleton (not shown in FIGS. 14 and 15) (in this example, five substrates A as shown in FIG. A1 to A5) After being mounted, cast-in-place concrete is cast thereon to form a hollow slab structure, and a living space is constructed with a floor plan as shown in FIG.

  In the example shown in FIG. 14, the living room / dining room and the Japanese-style room are on the veranda side, the Western-style room 1 and the kitchen are inside, and the Western-style room 2 and the bathroom, the washroom and the dressing room are further inside (the common corridor side). Entrance is located. In the living space as 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. On the other hand, a non-living room such as a kitchen, a bathroom, a dressing room, and an entrance can be said to be a region in which high floor impact noise is less likely to be generated 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 attached to the living room / dining room and the area to be a Japanese-style room, embedded materials (10 to 10D, 200 to 200D) capable of reducing the hollow ratio according to the present invention (shown by hatching). Any one of which is fixed on the entire surface of the precast concrete plate 3 is used 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 (hatched areas) are provided in and around the regions to be the Western room 1 and the Western room 2. Embedment material that has not taken the conventionally known means of reducing the hollow ratio in other areas (kitchen, bathroom, washroom, non-living room part that becomes the entrance, etc.). By using the fixed hollow slab substrate, the sound insulation performance is partially ensured, and the required hollow ratio is also ensured.

  Although not shown, the areas where the water pipes need to be installed horizontally, such as bathrooms, toilets, and dressing rooms, are areas where large floors are required. You may make it cast in place cast concrete without disposing itself. Thereby, the floor surface of the house can be made 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.

The figure explaining the board | substrate for hollow slabs with the embedding material by this invention. Sectional drawing explaining the hollow slab structure constructed | assembled using the substrate for hollow slabs shown in FIG. It is a figure explaining other embodiment of the embedding material by this invention, FIG. 3a shows a perspective view, FIG. 3b shows sectional drawing which follows the bb line of FIG. 3a. FIG. 4B 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 a cross-sectional view along the line bb in FIG. 4A. 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. FIG. 6A is a view for explaining still another embodiment of the embedding material according to the present invention. FIG. 6A is a perspective view, and FIG. 6B is a perspective view as viewed from the back. It is a figure explaining one embodiment of the mode of fixation of the embedding material to the precast concrete board by the present invention, and is immobilized using the embedding material support. 8A and 8B are diagrams illustrating 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-sectional view taken along line cc of FIG. Sectional drawing explaining the hollow slab structure constructed | assembled using the substrate for hollow slabs shown in FIG. 10A and 10B are diagrams illustrating 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-sectional view taken along line cc of FIG. 10A. 11A and 11B are diagrams illustrating still another embodiment of the embedding material according to the present invention, wherein FIG. 11A is a perspective view, FIG. 11B is a side view, and FIG. 11C is a diagram along the lines cc and dd in FIG. FIG. FIG. 12A is a view for explaining still another embodiment of the embedding material according to the present invention. FIG. 12A is a perspective view, FIG. 12B is a side view, and FIG. 12C is a cross-sectional view taken along line cc of FIG. 12A. 13A and 13B are diagrams illustrating still another embodiment of the embedding material according to the present invention, wherein FIG. 13A is a perspective view, FIG. 13B is a side view, and FIG. 13C is a cross-sectional view taken along line cc of FIG. 13A. The top view which shows an example of the layout of an apartment house. The slab bare surface view of the floor plan shown in FIG. Bird's-eye view showing a conventional hollow slab substrate. The figure which shows an example of the hollow slab structure and the structure using the conventional substrate for hollow slabs. The figure explaining the piping state using the conventional substrate for hollow slabs. FIG. 19a is a diagram illustrating a cross section of a conventional hollow slab structure using an embedding material of another shape, and FIG. 19b is a bottom view of the embedding material used.

Explanation of reference numerals

A: substrate for hollow slab, C: cast-in-place concrete, 3: precast concrete plate (PCa plate), 10 to 10D, 200 to 200D: embedded material, 11, 12: formed on the back side of the embedded material Grooves that are convex and open in the lateral direction (backside depressions), 13, 14 ... concave grooves (frontside depressions) formed on the front side of the embedding material, 15 ... through-holes communicating the lower end with the depressions on the rear surface, 50 ... Embedded material support

Claims (7)

  An embedding material that is fixed on a precast concrete plate and is buried in the concrete by cast-in-place concrete to form a hollow slab structure, and has a concave back surface convex upward on the back surface and a concave surface on the front surface side. An embedding material, wherein downwardly convex surface depressions are formed to intersect, and these depressions have a depth to form a through hole at the intersection.   An embedding material that is fixed on a precast concrete plate and is buried in the concrete by cast-in-place concrete to form a hollow slab structure, and has a concave back surface convex upward on the back surface and a concave surface on the front surface side. The surface dent that is convex downward is formed such that the bottom surface of the surface dent is positioned lower than the position of the ceiling surface of the back surface dent, and thereby, at the intersection of the back surface dent and the surface dent, A through-hole communicating with the lower end of the backside dent is formed, and the cast-in-place cast concrete flows into the backside dent through the through-hole, spreads to the backside of the embedding material, and An embedding material characterized by being integrated with the concrete of a precast concrete plate.   An embedding material fixed on a precast concrete plate and buried in the concrete by cast-in-place concrete to form a hollow slab structure, wherein the embedding material is upwardly convex and has a lateral direction. An embedding material, wherein an open dent is formed in the dent, and two or more through holes communicating the lower end thereof are formed in the thickness direction.   The embedding material according to claim 3, wherein a gap is formed in the embedding material, the gap extending from the front surface to the back surface.   The embedding material according to claim 3 or 4, wherein the embedding material is further formed with a second through hole that passes from the front surface to the back surface.   6. A hollow slab substrate comprising a plurality of embedding materials fixed on a precast concrete plate, wherein at least a part or all of the plurality of embedding materials are embedded materials. A substrate for a hollow slab, characterized in that the substrate is an embedding material according to the above.   A structure, wherein the substrate for a hollow slab according to claim 6 is used as all or a part of a substrate having a hollow club structure, and a through hole of the embedding material is filled with cast-in-place concrete.

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