JP2003176592A - Embedding material for hollow slab, base plate for hollow slab having embedding material, and construction having hollow slab structure with fixed embedding material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a embedding material and a base plate for a hollow slab having the embedding material that has a horizontal area substantially equal to that in the prior art and can easily and certainly reduce hollow factor of a hollow slab structure without reducing structural strength. <P>SOLUTION: Rear face recesses 11 and 12 are formed in the rear face of the embedding material 10, and a through hole 15 communicating with the rear face recesses is formed in the thickness direction. The embedding material 10 is fixed onto a precast concrete plate 3 to form the base plate A for the hollow slab. When cost-in place concrete is poured in an execution field, the cost-in place concrete is easily filled into the rear face recesses 11 and 12 through the through hole 15. Thus, the hollow factor of the embedding material is reduced to hold high sound insulation performance of the hollow slab structure. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In the recent floor structure of a concrete-type apartment house, a lightweight embedding material is fixed on a precast concrete board (PCa board), and a cast-in-place concrete is placed on the embedded pottery material to cast a concrete in the cast-in-place concrete. A hollow slab structure, in which an embedding material is embedded in, is widely adopted. 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 board 3 having truss bars 2 in a predetermined shape. As shown in FIG. 17 or FIG. 18, the hollow slab substrate A1 fixed at appropriate intervals is
A required number of frames are placed between the beams B and B of the frame, and the space P between the potting materials 1 and 1 is used to construct the equipment pipe P.
The hollow slab CS is constructed by placing the concrete C in place after the reinforcement of the slab upper end reinforcement 4 and the like. This hollow slab structure has the advantages that it is lightweight and has high rigidity, does not require a beam in the living room, and allows the plan of the interior of the dwelling unit to be freely set.

In the above-mentioned hollow slab structure, as a measure for the sound insulation performance of the upper and lower floors of the housing complex, as shown in FIG. 19a, slits penetrating in the plate thickness direction between the recessed portions 1b formed at predetermined intervals. Embedding material 1a forming 1c
(FIG. 19b is a rear view thereof) is fixed on the precast concrete board 3 at a predetermined interval, and the cast-in-place concrete C is passed through the slits 1c to the precast concrete board 3 to be integrated vertically. As a result, an embedding material has been proposed in which the resonance phenomenon in units of hollow portions is reduced as much as possible (see Japanese Patent No. 2601314).

[0004]

Problems to be Solved by the Invention Japanese Patent No. 26013
By constructing the hollow slab using the embedding material having the structure disclosed in Japanese Patent Publication No. 14, the problem of sound insulation performance of the upper and lower floors of the apartment house has been improved to some extent. However, on the other hand, there is a demand to improve the overall living environment to a level that is more comfortable than the conventional standard, and a higher level of sound insulation performance is being demanded for the upper and lower floors of an apartment house. However,
In a hollow slab structure, improving sound insulation performance and achieving weight reduction are contradictory propositions, and in order to obtain high sound insulation performance (that is, increase the amount of concrete and increase the mass), the hollow ratio must be reduced. I don't get.

By the way, in the embedding material 1a having the structure disclosed in the above-mentioned Japanese Patent No. 2601314, the volume into which the concrete penetrates is only the portion of the slit 1c, and there is a limit. Increasing the cross-sectional area of the slit 1c will increase the amount of concrete C infiltrated, which can be expected to further improve the sound insulation performance, but the structural strength of the embedding material will decrease, and it will be transported or fixed to the precast concrete board or on site. May be damaged during construction work. As another method, it is conceivable to fix the embedding material having a small horizontal cross-sectional area to the precast concrete plate with a wide gap, but the fixing operation of the embedding material becomes complicated. Therefore, the first object of the present invention is an embedding material having substantially the same horizontal cross-sectional area as the conventional one, but the hollow ratio of the hollow slab structure can be arbitrarily set without inducing the structural strength of the embedding material. It is to provide an embedding material that can be reduced to

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

[0007]

An embedding material for a hollow slab according to the present invention for solving the above problems is fixed on a precast concrete plate and embedded in the concrete by cast-in-place concrete. An embedding material forming a hollow slab structure, basically, a back surface recess which is convex upward and is opened in a side direction is formed on the side of the embedding material facing the precast concrete plate,
Furthermore, a through hole that communicates the lower end to the back surface recess is formed in the plate thickness direction, and the cast-in-place concrete to be poured flows into the back surface recess through the through hole, and It is characterized in that it spreads to the back side and is integrated with the concrete of the precast concrete 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. It is characterized in that the embedding material is the above-mentioned embedding material in which a convex depression and a through hole in the plate thickness direction are formed.

Further, a structure having a hollow slab structure according to the present invention for solving the above-mentioned problems has the above-mentioned substrate for hollow slab as all or a part of the substrate of the hollow slab structure, or has a high floor impact. The embedding material having the above-mentioned convex back surface depression and the through hole in the plate thickness direction is fixed in the area where the sound is expected to be generated, and at least the through hole is not provided in other areas. It is characterized by having a hollow slab structure in which conventional embedding material is fixed or in-situ concrete is cast without embedding material being fixed.

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 is
Through the through hole of the embedding material, it penetrates into the upward convex back surface recess formed on the back surface side of the embedding material and easily reaches the back surface side to fill the back surface recess with concrete. Furthermore, the through holes are also filled with concrete. Thereby, in the hollow slab structure to be constructed, the hollow ratio occupied by the embedding material portion is the same as the volume of the upwardly convex rear surface depression (the volume may be arbitrarily determined according to design conditions). Further, compared with the conventional one, the reduction is further reduced, 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 substantially only reduces the cross-sectional integral of the through hole, and does not cause a structurally large reduction in strength. Further, the upwardly convex rear surface recess also opens in the side surface direction of the embedding material, and the cast-in-place concrete to be poured flows even through the opening in the side surface direction. As a result, the flowability of the cast-in-place concrete into the back surface depression is increased, the concrete can be reliably filled into the back surface depression without a gap, and a predetermined sound insulation performance can be reliably ensured.

The embedding material may preferably have a shape in which the surface-side shape in the cross section has a convex chevron shape. In this case, the vibration generated by the floor impact on the upper concrete shell part of the hollow part of the concrete slab is dissipated along the curved surface of the upper concrete shell part in the part that has a convex chevron shape above the embedding material. Diffuse and reduce the bending that occurs in the concrete shell portion, as a result, compared to the case of using an embedding material having a rectangular cross section in the lateral direction, the occurrence of resonance itself is suppressed, Sound insulation performance is further improved.

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 direction is the upper side, and is a plurality of quadrangular pyramids in which the head having four inclined surfaces is cut off. May be. In these aspects, the in-situ concrete is more surely flowed into the through hole, and also in the surface depression, or in the space area between the surface of the precast concrete plate and the back surface of the embedding material, the concrete. , Which increases the rigidity and mass of the region, further reduces the resonance phenomenon as much as possible, and further improves the sound insulation performance.

As stated above, the primary purpose of hollow slabs in construction is to reduce the weight of concrete slabs.
Therefore, burying the above-mentioned embedding material capable of reducing the hollow ratio on the entire surface of the concrete slab does not necessarily achieve the intended purpose of the hollow slab structure, even if improvement in sound insulation performance can be expected. Can also happen.
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 embedding materials embedded in the cast-in-place concrete can be embeded to reduce the hollow ratio. As the other embedding materials, the other embedding materials are conventionally known as ordinary embedding materials to satisfy both the problems of weight reduction and improvement of sound insulation performance at the same time.

At this time, an area in which a high floor impact sound is predicted to occur, such as an area used for living such as a living room, a tea room, a bedroom, a guest room, and a reception room in a living space, is predicted. The floor part including the above is embedded with an embedding material capable of reducing the above-mentioned hollow ratio to ensure sound insulation performance, while other non-residential areas such as kitchens, toilets, bathrooms, and sheds are usually known to have been conventionally known. Fix the embedding material in to secure the required hollowness.

In still another embodiment of the substrate for a hollow slab or the structure having a hollow slab structure according to the present invention, a portion such as a bathroom, a toilet, a washroom, etc., which needs to be installed across the water pipe is a large floor. Since it is a place that requires a space, do not set the embedding material in that region. By doing so, as a result, the floor surface of the house can be made smooth throughout the dwelling unit, and for the safety of the elderly or the convenience of using wheelchairs with the advent of an aging society. It is possible to answer the request to eliminate the height difference of the floor finish of the house.

In the present invention, any material may be used as the material for the embedding material, provided that it is lightweight and does not deform due to the concrete to be placed.
A synthetic resin foam molded article such as expanded polystyrene is most preferably used. In addition, a foam such as a styrene resin, a polyolefin resin, a hard urethane resin, a phenol resin, a polyisotianate resin, or an epoxy resin, or a foam in which these resins are appropriately mixed can be used. The foaming method is arbitrary, and may be appropriately selected depending on the shapes of the synthetic resin material used such as extrusion foaming and foaming in a bead mold and 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.
Acrylic acid is used as a monomer that can be copolymerized with a styrene-based monomer, and is composed of a copolymer containing at least wt%.
Methacrylic acid or esters thereof, acrylonitrile, methacrylonitrile, maleic anhydride, etc. may be mentioned.

As the polyolefin resin, high density polyethylene, low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-carboxylic acid ester copolymer,
Examples thereof include ethylene-carboxylic acid metal salt copolymers, crystalline polypropylene homopolymers, crystalline propylene-ethylene copolymers and crystalline propylene-ethylene-diene terpolymers.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a part of a hollow slab substrate A using a hollow slab embedding material 10 according to the present invention, and FIG. 2 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 based on FIG. 16, and truss streaks 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 entire precast concrete plate (PCa plate) 3 with an appropriate interval, 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 applied only to a portion such as a living room / dining room, a Western-style room, a Japanese-style room, or the like where a high floor impact sound is expected to occur in a normal living environment Alternatively, the conventional embedding material 1 having a flat surface and a recessed portion on the back surface may be fixed to other portions.

The embedding material 10 is box-shaped, and has a back surface side,
That is, on the side facing the precast concrete plate 3, there is an appropriate number (two in the figure) of the first back surface grooves 11 in the longitudinal direction that are convex upward, and in the lateral direction that is also convex upward. An appropriate number of second rear surface grooves 12 (two in the figure, two in a pair making a total of six) are formed so as to cross each other with both ends open to the side surfaces 10a, 10b of the embedding material 10. Has been done. Although not shown, recessed portions may be formed in the portions where the first and second back surface grooves 11 and 12 are not formed, as in the conventional embedding material. In addition, this first
The second back surface grooves 11 and 12 correspond to the back surface depressions in the present invention.

Also on the front surface side, the first back surface groove 11 and the second back surface groove 11
A first surface groove 13 which is downwardly convex and a second surface groove 14 which is also downwardly convex are formed in the same manner at positions facing the back surface groove 12. Then, in each intersecting portion of each groove, a proper number (a total of 12 holes in the figure) of through holes 15 communicating from the front surface groove to the back surface groove are formed in the plate thickness direction. Whether or not the surface grooves 13 and 14 are provided is arbitrary, and either one or both of them may be omitted. The first and second surface grooves 13 and 14 correspond to the surface depression in the present invention.

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

Like the conventional hollow slab substrate, the embedding material 10 is fixed on the precast concrete plate 3 having the truss bars 2 at a predetermined interval to manufacture the hollow slab substrate A. As shown in FIG. 17, the required number of the hollow slab substrate A is placed between the beams B and B of the skeleton, and if necessary, the construction of the equipment pipe P and the reinforcement of the slab upper end streak 4 are performed. After the completion, the cast-in-place concrete C is placed.

The cast-in-place concrete C that has been cast passes through the through-holes 15 formed in the embedding material 10 and has a first back surface groove 11 and a second back surface groove 12 that are convex above the back surface of the embedding material.
Flows into. The first back surface groove 11 and the second back surface groove 12 have both ends open to the side surfaces 10a and 10b of the embedding material 10, and the cast-in-place concrete C flows into the back surface groove from the open ends as well. Thus, the first rear surface groove 11
And the second back surface groove 12 is easily and reliably filled with the cast-in-place concrete C. Cast-in-place concrete C is
After filling the through hole 15 and the first and second surface grooves 13, 14 as well, as shown in FIG. 2, a concrete layer having a required thickness is formed on the embedding material 10 and the concrete is hardened. This builds the hollow slab in the required construction. In the illustrated example, the ceiling surfaces of the upwardly convex first and second back surface grooves 11 and 12 are shown as flat surfaces, but the vicinity of the longitudinal center of the ceiling surface projects downward. It is also possible to use such a ship bottom type, whereby it is possible to further ensure the filling with the cast-in-place concrete C in the rear surface grooves 11 and 12.

In the hollow slab structure constructed as described above, the hollow ratio occupied by the embedding material 10 is such that the first and second back grooves 11 and 12 having the above-mentioned upward protrusions, the through holes 15, and the first
And the second surface grooves 13 and 14 are reduced by the total volume thereof, and the rigidity and mass of that portion are increased, so that the occurrence of the above-mentioned resonance phenomenon can be reduced as much as possible. The sound insulation performance of the slab structure is greatly improved. In addition, in the embedding material 10 shown in the figure, the horizontal cross-sectional area of the embedding material 10 only substantially reduces the cross-sectional integral of the through hole 15.
Compared with the conventional embedding material shown in 6, the structural strength does not drop significantly.

There are many other forms of the embedding material that can fulfill the above functions. An embedding material 10A having a configuration in which a perspective view is shown in FIG. 3a and a sectional view taken along the line bb in FIG. 3b is shown in FIG.
1 and a surface groove (surface dent) that is convex downward on the surface side 1
Three 4 are formed, and the bottom surface 141 of each front surface groove 14 is positioned below the position of the ceiling surface 111 of the back surface groove 11. As a result, a through hole 15 having a lower end communicating 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, 16 is
It is a score line formed at a position that divides the entire embedding material 10A into approximately three in the longitudinal direction.

Also in this embedding material 10A, the cast-in-place concrete C flows into the rear surface groove 11 through the through hole 15. At the same time, it also flows into the back surface groove 11 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. Also, the surface groove 1
Four parts are also filled with cast-in-place concrete C. As a result, 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 surely improved. Also in this case, in the horizontal cross-sectional area of the embedding material 10A, substantially only the cross-sectional integral of the through hole 15 is reduced, and structurally no large decrease in strength occurs.

FIG. 4 shows still another embodiment of the embedding material according to the present invention, FIG. 4a is a perspective view, and FIG.
A cross-sectional view along a line is shown. This embedding material 10B has an appropriate number of back surface depressions 21 that are convex upward on the back surface side (three locations in the figure), and each back surface depression 21 is formed on the side surfaces 10a and 10b of the embedding material 10B. , Each having an open end 22. A through hole 15 is formed in the central portion of the ceiling of each back surface depression 21 and extends through the surface of the embedding material 10B. The surface side of the through hole 15 is a funnel-shaped inclined surface 15 that extends upward.
It is a. In the figure, reference numeral 16 is 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 recess 21 through the through hole 15 and also into the back surface recess 21 through the side surface open end 22 of the back surface recess 21. As a result, the inside of the rear surface depression 21 is easily and reliably filled with the cast-in-place concrete C. 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. Moreover, although the strength of the embedding material 10B hardly decreases, the area of the back surface depression 21 facing the precast concrete plate 3 can be made larger than that of the other structures. The rigidity and mass of the area are further increased.

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. This embedding material 10C has an upwardly convex rear surface groove (rear surface recess) 11 extending in the longitudinal direction on the rear surface side.
1 is formed on the front surface side, and a surface groove (surface recess) 13 in the longitudinal direction is convex downward at a position facing the back surface groove 11.
, And three surface grooves (surface depressions) 14 in the lateral 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 type cross section in the lateral direction, and as shown in the figure, the entire back surface has the back groove 11 at the lowest position, and both sides thereof are longitudinal side surfaces 10b. The slanted surfaces 31 and 31 are raised toward. Then, the inclined surfaces 31, 31 are provided with legs 32 for the purpose of stabilizing the posture when the embedding material 10C is placed on the precast concrete board 3. The leg 32 may be omitted.

Further, the front surface groove 13 in the longitudinal direction is formed with a proper number of through-holes 15 through which the back surface groove 11 extends.
A side edge portion of the rear surface groove 11 near the lower end portion of the through hole 15 is formed as a notch 33 that is convex upward. Also,
Each surface groove 14 in the lateral direction is also formed with an appropriate number of through holes 15b that are formed through the inclined surfaces 31, 31. In the figure, reference numeral 16 designates the entire embedding material 10C in the longitudinal direction of approximately 3
It is a score line formed at a dividing position.

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.
It also flows into the space between the back inclined surfaces 31 and 31 of C and the surface of the precast concrete plate 3. In addition, the cast-in-place concrete C also has the back surface groove 1 from the side surface open end of the back surface groove 11.
1, and the cast-in-place concrete C also flows in the cutout 33. The cast-in-place concrete C also flows from the outside 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. Furthermore, the surface grooves 13, 14 are also filled with cast-in-place concrete C.

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

FIG. 6 shows still another embodiment of the embedding material according to the present invention. FIG. 6a shows a perspective view seen from above, and FIG. 6b shows a perspective view seen from the back side. This embedding material 1
0D has the same shape on the surface side as the embedding material 10C shown in FIG. 5, one longitudinal surface groove 13 that is convex downward and one downward convex in a direction orthogonal to the surface groove 13. Three surface grooves 14 in the lateral direction are formed. Then, a cut line 16 is formed at a position that divides the entire embedding material 10D into approximately three parts in the longitudinal direction, and the back surface side of the embedding material 10D is a head for each block divided by the cut line 16. To form a quadrangular pyramid, each of which has four inclined surfaces 41. A surface groove 13 in the longitudinal direction and a surface groove 14 in the lateral direction formed on the surface of each of the four-sided pyramids.
An upward convex rear surface groove (rear surface depression) 11 extending in the longitudinal direction and an upward convex rear surface groove (rear surface depression) 12 extending in the lateral direction are formed in a cross shape at a position facing each other. Further, the front surface groove 13 in the longitudinal direction is formed with an appropriate number of through holes 15 which are removed to the back surface groove 11, and the front surface grooves 14 in each lateral direction are also provided with an appropriate number of through holes 15b which are removed to the back surface groove 12.
Are formed.

In this embedding material 10D, the cast-in-place concrete C flows into the back surface grooves 11 and 12 through the through holes 15 and 15b. On the other hand, embedding material 10D
Each inclined surface 41 on the back side of and the precast concrete board 3
In-situ concrete C from the outside in the space between the surfaces of
Flows in and then flows into the back surface grooves 11 and 12 from the side surface opening portions of the back surface grooves 11 and 12. Further, the through holes and the surface groove portions are also filled with the 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 rear inclined surfaces 41 of the embedding material 10D can be filled with the cast-in-place concrete C. So Figure 5
Even when compared with the embedding material 10C shown in (4), 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 surely improved. Further, 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 structural strength is hardly reduced.

In order to fix the embedding materials 10 to 10D on the surface of the precast concrete plate 3, for example, as shown in Japanese Patent Publication No. 57-47008, fixing tools may be used. It may be fixed by forming a convex portion on the back surface of the embedding material and pressing the convex portion as shown in Japanese Laid-Open Patent Publication No. 54-138018, or by fixing with an adhesive or an adhesive tape. Good. 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 provided that a predetermined fogging can be taken between the surface of the embedding material and the slab upper end streak 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 a fixing mode of the embedding material in such a case. Here, the embedding material is fixed by using the embedding material support 50.

That is, the precast concrete board 3
The precast concrete board 3 is provided with an embedding material support tool 50 having a shape capable of holding the back surface (back surface) of the embedding material to be fixed on it in a stable posture when manufacturing
, And 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 type shown in FIG. Left and right rear inclined surfaces 31, 31 of the insert material 10C
The shape is such that it is bent in an M-shape so as to follow. It should be noted that what is shown in FIG. 7 is merely an example, and as described above, the embedding material support tool 50 lifts the back surface side (back surface side) of the embedding material to be fixed on the embedding material support tool 50 in a stable posture. Any shape can be used as long as it can be held in this state, and an appropriate shape can be used according to the shape of the embedding material used.

8 to 13 show another embodiment of the embedding material according to the present invention. The embedding materials 10 to 10D shown in FIGS. 1 to 7 have basically flat surfaces, and appropriate surface depressions are formed on the flat surfaces as necessary, whereas FIG. The embedding material shown in FIGS. 13 to 13 is characterized in that it has at least a portion in which the shape on the surface side in the cross section has a convex upward chevron shape.

For example, the embedding material 200 shown in FIG. 8 is box-shaped as a whole, but a plurality of (4 in the figure) mountain-shaped convex stripes 201 on the surface side are arranged in the longitudinal direction. A plurality of (three in the figure) concave grooves 214 are formed so as to be orthogonal to the four convex stripes 201. Then, an upward convex back surface groove 211 is formed in parallel with the concave groove 214 at a position corresponding to the concave groove 214 on the back surface side, and the back surface groove 211 is embedded in the embedding material 2.
Both sides are open to the side surfaces 200a and 200b of No. 00.
Although not shown, a recessed portion may be formed in a portion where the back surface groove 211 is not formed, as in the conventional embedding material. The back surface groove 211 corresponds 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) for connecting the concave groove 214 and the back surface groove 211 are formed in the plate thickness direction, and the ridge 2 is formed.
An appropriate number of through-holes 215a are formed in the recess between 01 and the ridge 201 (from the front surface to the back surface, a total of four through holes 215a are formed only in the central recess portion). In addition, the ridge 20
The depression between 1 and the ridge 201 corresponds to the surface depression in the present invention.

The embedding material 200 is hollowed by fixing a suitable number of the embedding materials 10 to 10D shown in FIGS. 1 to 7 on the precast concrete plate 3 having the truss bars 2 at predetermined intervals. The slab substrate A is manufactured. Then, the hollow slab substrate A is used to construct a hollow slab in a required structure as shown in FIG. At that time, the cast-in-place concrete C poured through the through holes 215 and 215a formed in the embedding material 200 flows into the back surface groove 211 which is convex on the back surface of the embedding material, and Even when the cast-in-place concrete C flows into the back surface groove from the open end of the back surface groove 211, the embedding material 10 shown in FIGS.
It is similar to the case of 10D.

Further, in the hollow slab structure constructed by using the substrate A for hollow slabs on which the embedding material 200 is fixed, the hollow slab structure is formed on the upper surface of the convex ridge 201 on the surface of the embedding material 200. The vibration generated by the floor impact on the upper concrete shell portion is dissipated and damped along the curved surface along the upper surface of the convex strip 201 of the concrete shell portion, and the bending generated in the concrete shell portion is the same as the conventional surface. Is smaller than the embedding material that is flat.
As a result, the occurrence of resonance due 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.

In the embedding material 200A shown in FIG. 10, the back surface side of the convex ridge 201 in the embedding material 200 described above is also a convex ridge 250 having a downward convex convex shape, and The structure is different from that of the embedding material 200 in that a gap 251 is formed between the ridge 201 and the front surface and the back surface. In this embedding material 200A as well, the cast-in-place concrete C can flow into the back surface groove 211 through the through hole 215 and the gap 251, and the hollow slab substrate A on which the embedding material 200A is fixed is used. Embedding material 200 in a slab structure
The vibration generated by the floor impact on the upper concrete shell portion formed on the upper surface of the mountain-shaped convex strip 201 on the surface of A is similar to the case of the embedding material 200, and the convex strip of the concrete shell portion is generated. Dispersion is damped along the curved surface along the upper surface of 201, and the occurrence of resonance due to the presence of the hollow portion in the hollow slab is suppressed.

In the embedding material 200B shown in FIG. 11, a plurality of cylindrical bodies 260 having a cylindrical shape as a whole (two in the figure are shown, but the number is arbitrary) are integrally formed adjacent to each other. Each cylindrical body 260 is formed with an appropriate number of through holes 215 (three in the figure) penetrating from the front surface to the back surface, and the through holes 215 are also formed on the joint surface between the cylindrical bodies 260.
A suitable number (4 in the figure) is formed. Further, at a position on the back surface side corresponding to the position where the through hole 215 is formed, a back surface groove 211 which is convex upward is formed in a direction orthogonal to the axial center line of the tubular body 260. The back surface grooves 211 are the side surfaces 200a and 200b of the embedding material 200B.
Both ends are open. It is not necessary to explain that the embedding material 200B also has the same function as that of the embedding material 200 or 200A.

The embedding material 200C shown in FIG. 12 has a through hole 21 penetrating from the front surface to the back surface of a single cylindrical body 260.
5 are formed in appropriate numbers (3 in the figure), and on the back surface side corresponding to the place where the through hole 215 is formed,
A back groove 211 that is convex upward is formed in a direction orthogonal to the axis of the tubular body 260. Embedding material 200 shown in FIG.
D is different from the embedding material 200C shown in FIG. 12 in that the cylindrical body 260 has an oval shape instead of a circular cross section, and the other shapes are the same. Also in the case of these embedding materials, as in the embedding material 200 or 200A described above, the precast concrete plate 3 having the truss bars 2 is provided.
The hollow slab substrate A is manufactured by fixing a suitable number of the above at a predetermined interval, and in the hollow slab constructed using the hollow slab substrate A, these embedding materials are different from those described above. It would not be necessary to explain that it can perform the same function as the embedding material.

Next, an example of a case where a hollow slab of an actual building is constructed by using the above-mentioned substrate A for hollow slabs on which the embedding material of the present invention is fixed will be described. FIG. 14 is a plan view showing an example of the floor plan of the housing complex, and FIG. 15 is a slab raw surface view thereof showing a state before the cast-in-place concrete C is cast. As described above with reference to FIG. 17, the required number of the hollow slab substrates A (in this example, FIG. 15) is provided between the beams (not shown in FIGS. 14 and 15) of the frame.
5 sheets, A1 to A5) are mounted, and on that,
After the cast-in-place concrete is cast into a hollow slab structure, 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 the balcony, and the Western-style room 2 and the bathroom are inside the Western-style room 1 and the kitchen.
A bathroom and a dressing room are installed. In the living space as described above, the living room and dining room, Western-style room, Japanese-style room, etc., are areas in which high floor impact noise is expected to occur in normal living conditions due to the children's splashes and running sounds. Yes, while the kitchen, bathroom, washroom,
It can be said that the non-residential room such as the entrance is an area in which a high floor impact sound is unlikely to be generated, as compared with a living room / dining room, a Western-style room, and a Japanese-style room.

Therefore, as the hollow slab substrates A1 and A2 to be attached to the area serving as the living room / dining room and the Japanese-style room, an embedding material (10 to 1) according to the present invention capable of reducing the hollow rate.
0D, 200 to 200D) (indicated by hatching) is fixed on the entire surface of the precast concrete plate 3 to secure sound insulation performance. On the other hand, as the remaining substrates for hollow slabs A3 to A5, embedding materials (10 to 10D, 200 to 200D) according to the present invention, which can reduce the hollow ratio, are provided in the region to be the Western room 1 and the Western room 2 and in the vicinity thereof.
One of the areas (indicated by hatching) is fixed, and other areas (non-residential room such as kitchen, bathroom, washroom, entrance, etc.) do not have any conventional means for reducing the hollow ratio. By using the substrate for the hollow slab on which the filling material is fixed, the sound insulation performance is partially ensured and the required hollowness is also secured.

Although not shown in the drawings, a portion such as a bathroom, a toilet, a washroom, etc., which requires a horizontal water pipe to be installed, requires a large floor space. It is also possible to place cast-in-place concrete without placing the embedding material itself. As a result, the floor finish of the house can be made smooth throughout the dwelling unit, and the height difference of the floor finish of the house can be eliminated for the safety of the elderly or the convenience of using a wheelchair.

[0052]

As can be seen from the above description, according to the present invention, the hollow ratio of the hollow slab structure can be easily and reliably ensured even though the horizontal cross-sectional area is almost the same as that of the conventional one, without lowering the structural strength. An embedding material that can be reduced and a substrate for a hollow slab having the embedding material are obtained. Further, by using the embedding material according to the present invention or the substrate for a hollow slab having the embedding material, it is possible to simultaneously satisfy both the problems of weight reduction and improvement of sound insulation performance as the entire floor area of one dwelling unit. A structure having a possible hollow slab structure can be easily constructed.

[Brief description of drawings]

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

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

3A and 3B are views for explaining another embodiment of the embedding material according to the present invention, in which FIG. 3A is a perspective view and FIG. 3B is b- of FIG. 3A.
A sectional view taken along the line b is shown.

4A and 4B are views for explaining still another embodiment of the embedding material according to the present invention, in which FIG. 4A is a perspective view and FIG. 4B is FIG. 4A.
3 is a sectional view taken along line bb of FIG.

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 seen from the back side.

6A and 6B are views 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 seen from the back side.

FIG. 7 is a diagram illustrating an embodiment of a fixing aspect of the embedding material on the precast concrete plate according to the present invention;
It is fixed using an embedding support.

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

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

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

11A and 11B are views for explaining still another embodiment of the embedding material according to the present invention, FIG. 11A is a perspective view, FIG. 11B is a side view, and FIG. 11C is a cc line and d of FIG. 11A. The cross-sectional view by the -d line is shown.

12A and 12B are views 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 sectional view taken along line cc of FIG. 12A. The figure is shown.

13A and 13B are views for explaining still another embodiment of the embedding material according to the present invention, FIG. 13A is a perspective view, FIG. 13B is a side view, and FIG. 13C is a sectional view taken along line cc of FIG. 13A. 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 raw surface view of the floor plan shown in FIG. 14. FIG.

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

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

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

19a is a cross-sectional view for explaining a hollow slab structure using an embedding material of another conventional shape, FIG.
b is a bottom view of the embedding material used.

[Explanation of symbols]

A: Substrate for hollow slab, C: Cast-in-place concrete, 3
... Precast concrete board (PCa board), 10-1
0D, 200 to 200D ... Embedding material, 11, 12 ... Grooves formed on the back surface side of the embedding material that are convex and open in the lateral direction (rear surface depressions), 13, 14 ... Front surface side of the embedding material Groove (surface dent) formed in 15 ... through hole communicating lower end with dent on back surface, 50 ... embedding material support

Claims (9)

[Claims] 1. An embedding material which is fixed on a precast concrete plate and is embedded in the concrete by pouring in-place concrete to form a hollow slab structure, wherein the precast concrete plate of the embedding material. A back surface recess that is convex upward and open in the side surface direction is formed on the side facing to, and a through hole that connects the lower end to the back surface recess is formed in the plate thickness direction, and the surface of the through hole is formed. The side has a funnel-shaped sloping surface that expands upward, the cast-in-place concrete to be poured flows into the back surface recess through the through hole, spreads to the back surface side of the embedding material, and the precast An embedding material characterized by being integrated with concrete of a concrete plate. 2. The embedding material according to claim 1, wherein the embedding material has a portion whose cross-sectional surface side shape is an upward convex mountain shape. 3. The convex mountain-shaped portion is formed in a plurality of rows in parallel, and a space penetrating in a vertical direction is formed in at least a part between the rows. The embedding material according to claim 2. 4. The embedding material also has a recess on the surface thereof, and at least an upper end of the through hole is open to the surface recess. Embedded material. 5. The embedding material according to claim 1, wherein a back surface of the embedding material is an inclined surface having a side surface as a higher level. 6. The embedding material according to claim 1, wherein the back surface side of the embedding material is a plurality of quadrangular pyramids in which a head having four inclined surfaces is cut off. Included material. 7. The embedding material according to claim 5, wherein the inclined surface has legs. 8. The embedding material is provided with a score line that divides the entire material in a longitudinal direction.
Any of the listed embedding materials. 9. A substrate for a hollow slab, comprising a plurality of embedding materials fixed on a precast concrete plate, wherein at least a part or all of the embedding materials of the plurality of embedding materials are said. A substrate for a hollow slab, which is the embedding material according to any one of claims 1 to 8.