JP2013044215A - Floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor slab capable of decreasing in thickness while securing excellent floor impact sound isolation performance.SOLUTION: A floor slab includes: a precast concrete floor board 31 which is laid between beams 2 and 2; reinforcements 4, 6 and 7 which are provided inside and on the floor board 31; and concrete 9 which is placed on the floor board 31 to fill the reinforcements. Characteristically, a hanging wall (PC hanging wall 51) protruded below an undersurface 39 of the floor board 31 and provided away from the beam 2 is provided.

Description

  The present invention relates to a floor slab that can reduce the thickness of the slab while ensuring excellent floor impact sound insulation performance.

  2. Description of the Related Art A floor slab formed by placing reinforcing bars on a precast concrete floor board spanned between beams and placing concrete on the floor board is known.

JP 2003-3596 A

Conventionally, if the floor slab area increases, the floor impact sound insulation performance of the floor slab decreases, so if the floor slab area increases, the floor slab thickness is increased to improve the floor impact sound insulation performance. However, when the thickness dimension of the floor slab is increased, there is a problem that not only the floor height of the building is increased and the weight is increased, but also the construction cost is increased. For example, in order to ensure the degree of freedom in space design, the floor area of floor slabs in apartment buildings has been increasing in recent years. In this case, the floor impact sound insulation performance of the room located on the center side of the floor slab is reduced. It was necessary to increase the thickness of the floor slab.
The present invention provides a floor slab capable of reducing the thickness of the slab while ensuring excellent floor impact sound insulation performance.

A floor slab according to the present invention is placed on a floor board so as to fill the reinforcing bar, a floor panel made of precast concrete spanned between the beams, a reinforcing bar provided inside and on the floor board, and the reinforcing bar. In addition, the floor slab provided with the concrete has a hanging wall that protrudes below the lower surface of the floor board and is separated from the beam. Compared with a floor slab that does not have a hanging wall, the thickness of the slab can be reduced, and the floor slab has a configuration excellent in floor impact sound insulation performance.
The vertical wall is formed by a precast concrete vertical wall that is formed between the end surfaces of the floor plates adjacent to each other and is installed in a through hole that penetrates the floor plate and projects downward from the lower surface of the floor plate. The construction period can be shortened by using precast concrete floorboards and vertical walls.
The protruding length of the ribs embedded in the precast concrete vertical wall and protruding from the upper surface of the vertical wall, and the protruding length of the truss bars embedded in the precast concrete floor panel and protruded from the upper surface of the floorboard Therefore, it is possible to construct a floor slab that can secure the fixing length between the stirrup and the cast concrete, prevent the rebar from being disturbed when placing the concrete, and secure the desired cover thickness.
Since the vertical wall is formed by placing concrete after placing the reinforcing bars in the formwork installed at the floor slab construction site, the vertical wall can be constructed at the floor slab construction site.
The floor slab is equipped with a block to form an area where the concrete is not filled in the floor slab, so that the amount of concrete placed to form the floor slab can be reduced, reducing the building weight and concrete. The construction cost can be reduced.

Sectional view of floor slab (corresponding to BB section in FIG. 3) (Embodiment 1) Sectional view of floor slab (corresponding to AA cross section in FIG. 3) (Embodiment 1) The figure which looked at the state before concrete placement of a floor slab from the upper side of a PC floor board and a PC vertical wall (illustration of the upper end reinforcement was abbreviate | omitted) (Embodiment 1). Sectional drawing (AA cross-section equivalent figure of FIG. 3) which shows the state before concrete placement of a floor slab (Embodiment 1).

Embodiment 1. FIG.
As shown in FIG. 1, a floor slab 1 includes a floor plate structure 3 having a floor plate 31 made of precast concrete (hereinafter referred to as a PC floor plate 31) spanned between a beam 2 and a beam 2 facing each other, and a PC. A vertical wall structure 5 having a vertical wall 51 made of precast concrete (hereinafter referred to as a PC vertical wall 51) provided below the lower surface 39 of the floor plate 31 and projecting from the beam 2; 31 and the reinforcing bar 4 provided inside the PC hanging wall 51, and the reinforcing bar 6 provided inside the PC floor plate 31 and the PC hanging wall 51 and projecting from the upper surface 32 of the PC floor plate 31 and the upper surface 52 of the PC hanging wall 51, The reinforcing bar 7 arranged on the PC floor 31 and the PC wall 51, the block 8 installed on the upper surface 32 of the PC floor 31, and the PC floor 31 and the PC wall 51 so as to fill the reinforcing bar 7. Hit Concrete 9 solidified been configured to include a.
The reinforcing bar 4 is a lower bar 36 and a main bar 56, which will be described later, the reinforcing bar 6 is a truss bar 34 and a stirrup 55, which will be described later, and the reinforcing bar 7 is a main bar 56, a joint bar 61, and an upper bar 62. , Spacer stripes 67. 10 is a pillar and 11 is a stud.

As shown in FIG. 4, the floor board structure 3 includes a PC floor board 31 formed in a flat plate shape, and an exposed reinforcing bar portion 33 protruding upward from the upper surface 32 of the PC floor board 31.
Inside the PC floor plate 31, a lower end portion 35 of the truss bar 34 and a lower end bar 36 are embedded.

For example, the lower end bar 36 is arranged in a steel mold form not shown, the lower end part 35 of the truss bar 34 is arranged, and the lower end part 35 and the lower end bar 36 of the truss bar 34 are bound to an iron wire or the like not shown. After being bound with a wire, a concrete having fluidity called ready-mixed concrete is poured into a steel formwork, and the concrete is solidified, whereby the flat plate-like PC floor plate 31 in which the concrete is solidified, and the PC floor plate 31 The floor board structure 3 provided with the exposed reinforcing bar part 33 by the truss bars 34 projecting upward from the upper surface 32 is formed.
The lower end stripe 36 is configured by a plurality of lower lower end stripes 37 that form a lower row of the lower end stripes 36 and a plurality of upper lower end stripes 38 that form an upper row of the lower end stripes 36. The plurality of lower lower bars 37 and the plurality of upper lower bars 38 are each formed by a straight reinforcing bar. The plurality of lower lower end stripes 37 are installed on the same plane parallel to the bottom surface of the mold, and are arranged so that the extending direction of the straight line faces one direction X (see FIG. 3; FIG. 4). And in the other direction Y (see FIG. 1; FIG. 3) that is a direction orthogonal to the one direction, they are arranged at a predetermined interval from each other. The plurality of upper lower end bars 38 are installed on the same plane as the upper surface of the plurality of lower lower end bars 37, are arranged so that the extending direction of the straight line faces the other direction, and in one direction They are arranged at a predetermined interval from each other. That is, the lower end stripe 36 is formed by arranging a plurality of lower lower end stripes 37 and a plurality of upper lower end stripes 38 in a lattice network pattern on a plane parallel to the bottom surface of the mold.

A plurality of blocks 8 are installed on the upper surface 32 of the PC floor board 31. The plurality of blocks 8 are arranged so as to be arranged at predetermined intervals in the one direction X and the other direction Y, and are fixed to the upper surface 32 of the PC floor board 31 by fixing means not shown.
The truss bars 34 are provided so as to continue along the other direction Y between the block 8 and the block 8 that are installed adjacent to each other with an interval in the one direction X.

As shown in FIG. 3, a notch 22 is formed on one end surface 21 of one PC floor 31 of two adjacent PC floors 31; 31, and a notch is formed on one end 21 of one PC floor 31. When the surface 23 where the portion 22 is not provided and the one end surface 24 of the other PC floor plate 31 are abutted, the notch 22 formed on the one end surface 21 of the one PC floor plate 31 and the other PC floor plate 31. A through-hole 25 surrounded by one end face 24 is formed.
And the vertical wall structure 5 is installed so that the PC floor board 31 may be penetrated through the said through-hole 25. FIG.

As shown in FIG. 1 and FIG. 4, the vertical wall structure 5 includes a PC vertical wall 51 formed in a rectangular parallelepiped shape and an exposed reinforcing bar portion 53 protruding from the upper surface 52 of the PC vertical wall 51.
As shown in FIG. 3, the PC vertical wall 51 has a horizontal cross-sectional shape that corresponds to the shape of the through hole 25, and the vertical height dimension of the PC floor plate 31 is as shown in FIG. 4. It is the structure formed longer than the thickness dimension. For example, it is formed in a rectangular parallelepiped shape in which the horizontal cross-sectional shape is a rectangular shape that is long in the other direction Y, which is a direction orthogonal to the beam 2, and whose vertical height is long in the vertical direction. The PC hanging wall 51 is formed in a rectangular parallelepiped shape having a length in the other direction Y of 5460 mm, a length in the one direction X of 200 mm, and a vertical height of 375 mm, for example.

For example, in the steel mold form not shown, the lower portions of the plurality of ribs 55 are arranged at a predetermined interval in the other direction Y, and the plurality of main bars 56 are connected to the plurality of ribs 55. In a state in which 56 and a plurality of stirrups 55 are bound by a binding wire, a concrete having fluidity called raw concrete is poured into a steel formwork, and the concrete is solidified, whereby the concrete is solidified. A vertical wall structure 5 including a PC vertical wall 51 having a shape, a flat plate-like PC floor plate 31, and a stirrup 55 protruding from an upper surface 52 of the PC vertical wall 51 is formed.
Then, the plurality of main muscles 56 and the plurality of stirrups 55 are bound by a binding line so as to connect the upper portions of the plurality of stirrups 55 protruding from the upper surface 52 of the PC hanging wall 51, whereby the PC vertical wall 51 An exposed reinforcing bar portion 53 is formed by the ribs 55 projecting from the upper surface 52 of the first bar and the plurality of main bars 56.

  As shown in FIG. 4, the protruding length of the ribs 55 protruding from the upper surface 52 of the PC hanging wall 51 is such that the upper end 59 of the PC hanging wall 51 of the PC hanging wall 51 is positioned in the through hole 25. In a state where the PC hanging wall 51 is installed so that the upper surface 52 of the hanging wall 51 and the upper surface 32 of the PC floor plate 31 are positioned on the same horizontal plane, the protruding length of the truss bar 34 is formed to be the same length. As a result, in the state where the upper surface 55a of the ribbed streak 55 and the lower surface 63a of the lower upper end strip 63 described later are in contact with each other, the staggered strip 55 and the lower upper end strip 63 are connected by a binding line.

  Further, the horizontal cross-sectional shape of the PC hanging wall 51 is such that the upper end 59 of the PC hanging wall 51 of the PC hanging wall 51 is positioned in the through hole 25, and the upper surface 52 of the PC hanging wall 51 and the PC floor plate 31. 1 and FIG. 2, the four side surfaces 60 of the PC vertical wall 51 and the four side surfaces 60 are arranged in a state where the PC vertical wall 51 is installed so that the upper surface 32 of the PC is positioned on the same horizontal plane. A gap a is formed between each of the through holes 25 facing each other. The gap a is formed to about 5 mm, for example. Since the clearance a is provided, the work of installing the PC hanging wall 51 in the through hole 25 from above becomes easy.

  The block 8 is used for the purpose of reducing the amount of cast-in-place concrete used with an increase in the thickness dimension of the floor slab 1, reducing the weight of the floor slab 1, reducing the construction cost of the apartment house, and the like. From these viewpoints, the block 8 is made of a material having a specific gravity lower than that of the concrete 9, for example, a foamed plastic material, a plastic material such as polystyrene or hard polyurethane, Styrofoam (trademark), wood or the like. The block 8 may be a hollow body or a solid body in the illustrated example.

  As shown in FIG. 2, the upper surface 81 of the block 8 has an arbitrary frequency band that propagates through the concrete layer 82 on the block 8 that covers the upper surface 81 of the block 8 due to the generation of impact sound on the upper surface 1t of the floor slab 1. As a reflection surface for the bending wave, a non-flat surface such as an uneven surface is formed. The upper surface 81 of the block 8 formed on such a non-flat surface can scatter a bending wave incident on the upper surface 81. For this reason, the repeated reflection of the bending wave between the upper surface 81 of the block 8 and the upper surface 1t of the concrete layer 82 and the occurrence of resonance in the concrete layer 82 are significantly reduced. The floor slab 1 having a performance, in particular, a blocking performance against impact sound in a high frequency band (250 to 2000 Hz band) is obtained.

The wavelength of the bending wave can be calculated using the following calculation formula.
λ = (π · C · h / (3 ^1/2 · f)) ^1/2
Here, λ is the bending wave wavelength (m), C is the bending wave propagation velocity (m / s), h is the thickness of the concrete layer (m), and f is the bending wave frequency (Hz).

Next, the construction method of the floor slab 1 will be described.
The floor board structure 3 and the hanging wall structure 5 manufactured in advance in a factory or the like are carried into the floor slab 1 construction site.
The end face 23 of the one end face 21 of the PC floor board 31 of one floor board structure 3 where the notched portion 22 is not provided and the one end face 24 of the PC floor board 31 of the other floor board structure 3 are abutted to each other, and the through hole 25. So that both ends of the two PC floor plates 31; 31 are installed on the beam 2; 2, and the lower surface 39 of the PC floor plate 31 is supported by the support device 90 installed on the floor slab 1A on the lower floor. Thus, the two floor board structures 3; 3 are supported from below (see FIG. 4).
Next, the PC vertical wall 51 of the vertical wall structure 5 is passed through the through hole 25 from above the through hole 25 so that the PC vertical wall 51 protrudes below the lower surface 39 of the PC floor plate 31. On the floor slab 1A on the lower floor, the portion 59 is positioned in the through hole 25 so that the upper surface 52 of the PC hanging wall 51 and the upper surface 32 of the PC floor 31 are maintained on the same horizontal plane. The vertical wall structure 5 is supported from below by supporting the lower surface 58 of the PC vertical wall 51 by the support device 91 installed on the wall (see FIG. 4).
As described above, the floor board structure 3; 3 and the vertical wall structure 5 are installed in a predetermined state. In this state, the joint bar 61 and the upper bar 62 are arranged on the PC floor plate 31 and the PC wall 51.
As shown in FIG. 3 and FIG. 4, the joint bar 61 is bound to the spacer bar 67 arranged on the upper surface 32 of the PC floor board 31, straddling the through hole 25, and the upper surface 32 of one PC floor board 31 and the other side. A plurality are installed so as to span the upper surface 32 of the PC floor board 31.
The upper end stripe 62 includes a plurality of lower upper end stripes 63 that form a lower row of the upper end stripes 62, and a plurality of upper upper end stripes 64 that form an upper row of the upper end stripes 62. The plurality of lower upper end bars 63 and the plurality of upper upper end bars 64 are each formed by a straight reinforcing bar. The plurality of lower upper end bars 63 are installed on the same plane on the plurality of truss bars 34, and the straight extension direction faces one direction X (see FIG. 2) and the plurality of truss bars 34. They are arranged so as to straddle between them, and are arranged at a predetermined interval in the other direction Y, which is a direction orthogonal to the one direction X. The plurality of upper upper stripes 64 are installed on the same plane as the upper surface of the plurality of lower upper stripes 63, are arranged such that the extending direction of the straight line faces the other direction Y, and one direction X are arranged at a predetermined interval from each other. That is, the upper end stripe 62 is formed by arranging a plurality of lower upper end stripes 63 and a plurality of upper upper end stripes 64 in a lattice network.
The lower upper end bars 63 and the truss bars 34 are bound by a binding line at a portion where the plurality of lower upper end bars 63 and the plurality of truss bars 34 intersect. The lower upper end stripe 63 and the upper upper end stripe 64 are bound by a binding line at a portion where the upper end stripe 64 intersects.
After arranging the joint reinforcement 61 and the upper reinforcement 62, the concrete 9 having fluidity called ready-mixed concrete is placed on the upper surface of the PC vertical wall 51 and the upper surface of the PC floor plate 31. The concrete 9 is placed so as to fill up the upper upper end stripe 64 and until the cover thickness from the upper surface of the upper upper end stripe 64 to the upper surface 1t of the floor slab 1 becomes a desired cover thickness.
And the concrete 9 solidifies, and the floor slab 1 provided with the vertical wall which consists of the PC vertical wall 51 which protruded below the lower surface 39 of the PC floor board 31 and was provided away from the beam 2 is completed.

According to the first embodiment, the floor slab 1 that does not need to be swayed by providing the vertical wall that protrudes downward from the lower surface 39 of the PC floor plate 31 by using the PC vertical wall 51 is used, so that the floor slab 1 is not easily shaken. Compared with a floor slab having no vertical wall, it is possible to provide a floor slab 1 having a configuration in which the thickness of the slab can be reduced and the floor impact sound blocking performance is excellent.
That is, the floor slab 1 is provided with a vertical wall that is not necessary for the building structure proof stress on the lower surface of the slab, so that the movement of the slab is restrained by the vertical wall and the impedance level of the floor slab 1 (impact force is applied to the floor slab). The floor slab 1 that is difficult to shake is increased, and the floor slab 1 is difficult to shake.
For example, if a floor slab having no vertical wall has a slab thickness of 320 mm in order to obtain a desired floor impact sound insulation performance, according to the floor slab 1 having the vertical wall according to the first embodiment, In order to obtain the desired floor impact sound insulation performance, the slab thickness can be reduced to about 300 mm, so that the slab thickness can be made thinner and the floor impact sound insulation can be achieved compared to the conventional floor slab having no vertical wall. A floor slab 1 having an excellent performance can be provided.
Moreover, since the floor slab 1 can be reduced in thickness, the floor height of the building can be lowered, and the amount of concrete to be formed for forming the floor slab 1 can be reduced, so that the weight of the building is reduced and the construction cost is reduced. be able to.

Moreover, since the PC floor board 31 and the PC hanging wall 51 are used, the construction period can be shortened.
Moreover, since the block 8 for forming the area (void) in which the concrete is not filled in the floor slab 1 is provided, the amount of concrete to be formed for forming the floor slab 1 can be reduced, and the weight of the building and Concrete can be reduced and construction costs can be reduced.
Further, in the state where the PC hanging wall 51 is installed so that the upper surface 52 of the PC hanging wall 51 and the upper surface 32 of the PC floor plate 31 are located on the same plane, the PC hanging wall 51 is embedded in the PC hanging wall 51 and the PC hanging wall. Since the protruding length of the ribs 55 protruding from the upper surface 52 of the wall 51 and the protruding length of the truss bars 34 embedded in the PC floor plate 31 and protruding from the upper surface 32 of the PC floor plate 31 are the same, The fixing length of 55 and the cast concrete 9 can be increased, the disturbance of the reinforcing bars during the concrete casting can be prevented, and a desired cover thickness can be secured.

Conventionally, a small beam that is directly connected to the beam may be formed between the beam so that both ends are continuous with the beam. This is a necessary configuration, and the position where it is arranged is also limited. On the other hand, the vertical wall of the present application is not directly connected to the beam and is not necessary for the building structure strength, and the arrangement position can be determined relatively freely.
In other words, the vertical wall of the present application is not subject to structural restrictions, can be freely placed where there is no hindrance in building design, and the slab thickness is reduced while ensuring excellent floor impact sound insulation performance. A floor slab that can be made is realized.
In the present application, the vertical wall is supported by the slab, and the floor slab 1 is designed in consideration of the load of the vertical wall. On the other hand, in the case of a small beam, the small beam supports the load of the floor slab. In this way, the design concept is reversed between the structure having the hanging wall of the present application and the structure having the conventional beam.

  The hanging wall may be provided anywhere, but in particular, by suppressing the floor slab 1 of the living dining room or the main bedroom, the floor slab 1 of the living dining room or the main bedroom can be suppressed by providing the floor wall in the living dining room or the main bedroom. In addition, the amount of concrete to form the floor slab 1 can be reduced, and the construction cost can be reduced.

Embodiment 2. FIG.
You may use the vertical wall structure provided with the PC vertical wall which has the support part outside the figure mounted on the upper surface 32 of the PC floor board 31 in the upper end side. In this case, you may comprise so that the position of a support part can be adjusted up and down using the height adjustment tool outside a figure. If the vertical wall structure is used, the PC vertical wall can be supported by the PC floor board 31 without using the support device 91, and the PC vertical wall is dropped into the through hole 25 from the upper surface 32 side of the PC floor board 31. Since the hanging wall structure can be installed in a desired state, the construction becomes easy.

Embodiment 3. FIG.
You may use what formed in the shape where the magnitude | size of the horizontal cross-sectional shape of the PC hanging wall 51 located below the lower surface 39 of the PC floor board 31 is larger than the magnitude | size of the through-hole 25. FIG. That is, you may use the vertical wall structure provided with the PC vertical wall which has the collar part outside a figure which contacts the surface around the through-hole 25 in the lower surface 39 of the PC floor board 31. FIG. In this case, since the restraining force with respect to the floor slab 1 is increased by the vertical wall having a large horizontal cross-sectional shape, the same floor impact sound blocking performance is obtained when using the PC vertical wall 31 of the first embodiment having no flanges. This can be realized by using a PC hanging wall having a projecting length shorter than the projecting length of the PC hanging wall 51 projecting downward from the lower surface 39. And since the length which protrudes below from the lower surface 39 of PC floor board 31 can be shortened, the ceiling height of the lower floor in a vertical wall part can be made high.

Embodiment 4 FIG.
The PC hanging wall 51 positioned below the lower surface of the PC floor plate 31 may be formed in a cross shape extending in the other direction Y and the one direction X. Also in this case, since the restraint force with respect to the floor slab 1 is increased by the vertical wall having a large horizontal cross-sectional shape, the same floor impact sound blocking performance can be obtained from the lower surface of the PC floor plate 31 when the PC vertical wall of the first embodiment is used. This can be realized by using a PC hanging wall having a protruding length shorter than the protruding length of the PC hanging wall 51, and the ceiling height of the lower floor in the hanging wall portion can be increased.

Embodiment 5. FIG.
The protruding length of the ribs 55 protruding above the upper surface 52 of the PC hanging wall 51 is such that the upper surface 52 of the PC hanging wall 51 and the upper surface 32 of the PC floor plate 31 are positioned on the same plane. In such a state, it is sufficient to have a length that allows fixing with the placed concrete 9.
Further, the protruding length of the ribs 55 may be set to be longer than the upper surface 1t of the floor slab 1.

Embodiment 6. FIG.
In the above embodiment, the vertical wall is formed using the PC vertical wall 51. However, the vertical wall can be formed below the through hole 25 by placing concrete on the floor slab construction site. A form wall (not shown) may be installed, a reinforcing bar may be placed in the formwork, and the vertical wall may be formed by concrete placement on site.

Embodiment 7. FIG.
In the above embodiment, the floor slab portion other than the vertical wall portion is formed by using the PC floor plate 31. However, a non-illustrated formwork for floor slab placement is installed between the beams, and the vertical wall placement is not illustrated. A floor slab with a vertical wall may be formed by installing reinforcing molds, placing reinforcing bars on the upper side of these molds, and placing concrete on these molds.

  In the first embodiment, the example in which the PC hanging wall 51 is installed so that the upper surface 52 of the PC hanging wall 51 and the upper surface 32 of the PC floor plate 31 are positioned on the same horizontal plane is shown. The upper surface 52 may be positioned between the upper surface 32 and the lower surface 39 of the PC floor board 31. For example, the PC hanging wall 51 may be installed such that the upper surface 52 of the PC hanging wall 51 is located below the upper surface 32 of the PC floor plate 31 and about 10 mm above the lower surface 39 of the PC floor plate 31. In this way, a step is generated between the upper surface 32 of the PC floor plate 31 and the upper surface 52 of the PC hanging wall 51, and a recess is formed between the end surface of the PC floor plate 31 and the upper surface 52 of the PC hanging wall 51. The filling property of the concrete to the upper surface 52 side of the PC hanging wall 51 is improved, and the integrity of the PC floor plate 31 and the PC hanging wall 51 is improved.

  Alternatively, the upper main bar 56 of the PC vertical wall 51 may be positioned directly below the lower upper bar 63 so that the upper surface of the upper main bar 56 and the upper surface of the truss bar 34 are aligned. In this way, the lower upper bar 63 can be supported by the main bar 56 orthogonal to the lower upper bar 63, so that the lower upper bar 63 can be favorably supported, and the disturbance of the reinforcing bar during concrete placement can be prevented.

  You may provide through-holes, such as for equipment piping and electrical wiring, in a hanging wall. If it does in this way, equipment piping and electric wiring can be passed through the through-hole of a hanging wall, and fitting of equipment piping and electric wiring can be made favorable.

1 floor slab, 2 beams, 4; 6; 7 rebar, 8 blocks, 9 concrete,
25 through holes, 31 PC floor board, 32 upper surface of PC floor board, 34 truss bars,
39 Lower surface of PC floor board, 51 PC hanging wall, 55 Stirrup.

Claims (5)

A floor provided with a floor made of precast concrete spanned between beams, a reinforcing bar provided inside and on the floor board, and concrete placed on the floor so as to fill the reinforcing bar In the slab,
A floor slab characterized by comprising a hanging wall that protrudes downward from the lower surface of the floor board and is provided away from the beam.   The vertical wall is formed by a precast concrete vertical wall that is formed between the end surfaces of the floor plates adjacent to each other and is installed in a through hole that penetrates the floor plate and projects downward from the lower surface of the floor plate. A floor slab according to claim 1 characterized in that   The protruding length of the ribs embedded in the precast concrete vertical wall and protruding from the upper surface of the vertical wall, and the protruding length of the truss bars embedded in the precast concrete floor panel and protruded from the upper surface of the floorboard The floor slab according to claim 2, wherein the same is used.   The floor slab according to claim 1, wherein the vertical wall is formed by placing concrete after placing a reinforcing bar in a formwork installed at a floor slab construction site.   The floor slab according to any one of claims 1 to 4, further comprising a block for forming a region in the floor slab that is not filled with concrete on the floor board.

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