JP3751763B2 - Concrete slabs and structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to co-down cleats slabs and constructs.
[0002]
[Prior art]
Most of the buildings such as reinforced concrete structures are constructed of precast concrete plates and concrete slabs. As shown in FIG. 18, a precast concrete plate 35 in which a lightweight formwork 34 is disposed between truss bars 33 is interposed between beams 36. A concrete slab 37 is formed by laying in an adjacent state.
[0003]
[Problems to be solved by the invention]
However, in the concrete slab as described above, since the truss reinforcement of the precast concrete plate is arranged only in the long side direction, the load flows only in one direction along the truss reinforcement, and particularly a large shearing force acts. In the surrounding area, the reinforcement was biased.
[0004]
The present invention has been made in view of these problems, and its object is strongly withstand shear forces acting peripheral portion therein Satoshi, and the load of the peripheral portion is two-way flow Turkey down cleats slabs and constructs Is to provide.
[0005]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the invention of claim 1 is characterized in that truss bars are arranged on one surface of a concrete plate having a predetermined size at an appropriate interval, and a lightweight formwork is arranged between these truss bars. In a concrete slab formed by placing a plurality of precast concrete plates adjacent to each other between the beams to form a lower floor, and top concrete is placed on the lower floor, the floor is disposed on at least both ends of the lower floor. Lightweight formwork is placed between the inner truss bars with the central truss bar in the middle of the precast concrete plate installed, and the center or both ends between the outer truss bars with the central truss bar as the boundary A small and lightweight formwork smaller than the lightweight formwork is disposed in the part, and a horizontal line crossing the truss bar is arranged between these lightweight formwork, and some of the horizontal lines are at one end. Precast con From REITs plate across the precast concrete plate of the central portion, characterized in that it is reinforcement to a precast concrete plate of the other end.
[0006]
According to the first aspect of the present invention, the peripheral portion of the concrete slab in which a large amount of top concrete is placed is strengthened to have a strength that can withstand the shearing force acting on the concrete slab, and the load acting on the peripheral portion is reduced to two. To flow in the direction.
[0007]
The invention of claim 2 is characterized in that a lightweight formwork is formed between the inner truss bars with the central truss bar among the truss bars arranged at an appropriate interval on one surface of a concrete plate of a predetermined size. A thin-walled precast concrete plate with a small and lightweight formwork smaller than the lightweight formwork is placed between the outer truss bars with the central truss line as the boundary. Between the thin precast concrete plates arranged on both ends, a thin precast concrete plate with a lightweight formwork placed between truss bars arranged at an appropriate interval on one surface of a concrete plate of a predetermined size and The composite thin-walled precast concrete board is placed adjacent to each other to form a lower floor, and top concrete is cast on the lower floor. Horizontal bars that cross the bars are arranged, and some of the horizontal bars cross from the thin precast concrete board at one end to the thin precast concrete board at the center and the composite thin precast concrete board at the other end. The composite thin-walled precast concrete board is laid out to a thin-walled precast concrete board. And arrange the lower truss bars in the other area at an appropriate interval so that the upper part protrudes, and connect the ends of the tall truss bars and the short truss bars to the predetermined locations on the concrete plate. The upper and lower bars are arranged in a vertical direction, and a step is formed with the difference in height between these tall and short truss muscles. The features.
[0008]
According to invention of Claim 2, a level | step-difference part can be easily formed in the concrete slab with which the peripheral part was reinforced.
[0009]
Moreover, invention of Claim 3 was equipped with said concrete slab, The structure characterized by the above-mentioned.
[0010]
According to the invention of claim 3, it is possible to construct a structure including a concrete slab whose peripheral portion is strengthened and a load acting on the peripheral portion can flow in two directions along the truss and transverse bars.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, after describing embodiment of the precast concrete board of this invention based on FIGS. 1-8, embodiment of concrete slab is demonstrated based on FIGS. 9-17.
[0030]
1 is a plan view of a precast concrete plate, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, (1) in FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and (2) is a cross-sectional view taken along line CC. FIG.
[0031]
A precast concrete board (hereinafter referred to as a thin PC board) 1 is arranged between a flat rectangular concrete board 2, a truss bar 3 arranged along the long side direction of the concrete board 2, and the truss bar 3. And a lightweight formwork 4.
[0032]
Five truss bars are arranged at appropriate intervals with the upper part protruding from the upper surface of the concrete plate 2, and a lightweight formwork 4 is arranged between one truss bar 3 with the truss bar 3 at the center as a boundary. However, the lightweight formwork 4 is not disposed between the other truss bars 3. Therefore, more concrete can be placed in a place where the lightweight mold 4 is not disposed than in a place where the lightweight mold 4 is disposed.
[0033]
The truss muscle 3 is a truss in which one upper chord (top muscle) 6 and two lower chords (lower muscle) 7 arranged in a triangular shape are joined by a corrugated lattice 8. The side protrudes from the upper surface of the concrete plate 2, and the lower chord 7 is joined to the bending reinforcement 9 in the concrete plate 2. The truss muscle 3 is not limited to the one described above, and may be a truss in which one upper chord and one lower chord are joined by a corrugated lattice.
[0034]
The lightweight mold 4 has a height lower than that of the truss bar 3 and is not crushed by the cast concrete, and specifically, a synthetic resin foam molded product by bead mold foam molding such as foamed polystyrene. However, it is also possible to use foam molded products made of ethylene resin, propylene resin, or the like. The material of the lightweight mold 4 is not particularly limited as long as it is lighter than concrete, and may be a hollow steel pipe or the like. Although eight lightweight molds 4 are arranged in FIG. 1, it can be arranged less or more by changing the size.
[0035]
(1) and (2) in FIG. 4 show a thin PC board 1a in which the lightweight mold 4 is not disposed between the truss bars 3 at the end, but the lightweight mold 4 is disposed between the remaining truss bars 3. 1b. (1) of the figure is a thin PC board 1a in which a lightweight mold 4 of the same size is arranged, and (2) is a thin PC board 1b in which a small and lightweight mold 5 is arranged in part. Thus, when the small and lightweight formwork 5 is disposed in a part, the transverse bars intersecting with the truss bars 3 can be arranged therebetween. On the other hand, it is also possible to provide a thin PC plate in which a lightweight mold is disposed only between end truss bars and a lightweight mold is not disposed between the remaining truss bars (not shown). Depending on the required strength, the location of the lightweight mold can be changed.
[0036]
Further, FIG. 6 shows the arrangement interval of the lightweight mold 4 disposed between one truss bar 3 with the truss bar 3 at the center of the concrete plate 2 as a boundary. The thin PC board 1c is wider than the interval between the lightweight molds 4. More top concrete can be placed between the lightweight molds 4 having a wider arrangement interval than between the lightweight molds 4 having a smaller arrangement interval. The width of this wide arrangement | positioning space | interval can be set to arbitrary width according to intensity | strength. Moreover, as shown in FIG. 6, the lightweight formwork 4 of a wide arrangement | positioning space | interval is not limited to 2 rows, One row or 2 rows or more may be sufficient.
[0037]
7 and 8, a small and lightweight mold 5 in which the lightweight mold 4 at the center of the concrete plate 2 or the lightweight mold 4 at the end of the concrete plate 2 is smaller than the other lightweight mold 4 is provided. Thin PC plates 1d, 1e, and 1f. (1) of FIG. 7 is a thin PC board 1d in which a small and lightweight formwork 5 is arranged at the center between one truss bar 3 with the truss bar 3 at the center of the concrete board 2 as a boundary. Also, (2) in the figure is a thin PC board 1e in which a small and lightweight formwork 5 is disposed at the center of the concrete board 2. Further, FIG. 8 shows a thin PC board 1f in which small and lightweight molds 5 are disposed at both ends between one truss bar 3 with the truss bar 3 at the center of the concrete plate 2 as a boundary. The size and arrangement interval of the small and lightweight mold 5 can be changed as required, and the small and lightweight molds 5 having different sizes can be arranged at equal intervals or at different intervals. Yes (not shown).
[0038]
FIG. 9 shows a concrete slab 10 using the thin PC plate 1 of FIG. 1, and the thin PC plate 1 is provided only at both ends of the space surrounded by the long beam 11 and the short beam 12, that is, only on the short beam 12 side. In addition to the laying, a normal thin PC board 13 is laid adjacently between these thin PC boards 1 to form a lower floor 14, and a slab upper end bar 15 is arranged on the lower floor 14 to form top concrete. 16 is cast.
[0039]
On the thin PC plate 1 at both ends of the lower floor 14, a lightweight mold 4 is disposed between one truss bar 3 with the truss bar 3 at the center as a boundary. The lightweight mold 4 is not provided. Therefore, as shown in FIG. 10, when the top concrete 16 is placed, the concrete slab 10 in which the peripheral portion of the short beam 12 is reinforced is formed. As the truss muscle 3, a triangular truss or an I-shaped truss can be used as described above.
[0040]
In addition, since the thin PC plates 1 at both ends are provided with horizontal bars 17 orthogonal to the truss bars 3, the thin PC plates 1 and the thin PC plates 1 and the short beams 12 are strongly integrated. As a result, the strength of the concrete slab 10 as a whole is increased, and a load acting on the periphery of the short beam 12 can flow in two directions. Further, a connecting bar 19 is arranged between the thin PC plates 1 and 13 and the long beam 11.
[0041]
The transverse bars 17 are arranged from the thin PC board 1 at one end of the lower floor 14 to the thin PC board 1 at the other end across the thin PC board 13 at the center, and are deformed reinforcing bars which are bundled in one or more. And a truss bar is used, and a predetermined length is connected by welding or the like.
[0042]
Further, as shown in FIG. 11, the horizontal bars 17 can be arranged only at the joint portion between the thin PC plate 1 and the short beam 12 and the joint portion between the thin PC plates 1.
[0043]
12 and 13 show that the thin PC plates 1a and 1b in FIG. 4, that is, the thin PC plates 1a and 1b in which the lightweight formwork 4 is not disposed between the truss bars 3 at the end are arranged on the short beam 12 side. Concrete slabs 10a and 10b provided. Among these, the thin PC plates 1b at both ends of the concrete slab 10b in FIG. 13 are partially provided with small and lightweight molds 5, and horizontal bars 18 are arranged between these small and lightweight molds 5. The unity with the short beam 12 is strengthened, and the peripheral part is also strengthened, so that the load acting on the short beam 12 flows in two directions.
[0044]
FIG. 14 shows a concrete slab 10c in which the thin PC plate 1c shown in FIG. 6 is disposed only at both ends of the space surrounded by the long beam 11 and the short beam 12, that is, only on the short beam 12 side. Between the lightweight molds 4 with a wide arrangement interval, horizontal bars 17 are arranged, and more top concrete 16 is placed than between the lightweight molds 4 with a small arrangement interval. Accordingly, since a large amount of top concrete 16 is placed in the peripheral portion of the concrete slab 10c to increase the rigidity, the strength is enough to withstand the shearing force acting on the top concrete 16, and the load acting on the peripheral portion is bi-directional. It is supposed to flow through.
[0045]
FIG. 15 shows a concrete slab 10d in which the thin PC plate 1d shown in FIG. 7 (1) is disposed on both ends of the space surrounded by the long beam 11 and the short beam 12, that is, on the short beam 12 side. A large number of transverse bars 18 are arranged between the small and light formwork 4 at the center of the thin PC plate 1d, and a load acting on the center flows along this.
[0046]
FIG. 16 shows a concrete slab 20 that uses the thin PC plate 1 of FIG. 1 and has a stepped portion. Both ends of the space surrounded by the long beam 21 and the short beam 22, that is, the short beam 22 are shown. A lower floor 24 is formed from a thin PC board 1 laid on the side, a normal thin PC board 13 laid between them, and a composite precast concrete board (hereinafter referred to as composite thin PC board) 23. 24, a slab upper end reinforcement 25 is arranged and a top concrete 26 is placed.
[0047]
In the composite thin PC board 23, a tall truss bar 29 is laid along one of the two divided areas 27, 28 along the long side direction, and the lightweight mold 4 is placed between them. It is arranged. On the other hand, a short truss bar 30 is arranged at appropriate intervals in the other area 28, and an end portion of the truss bar 29 is overlapped with a tall truss bar 29. In addition to the truss bars 29 and 30 being attached side by side, the overlapping bars can be overlapped vertically as shown in FIG. As a result, the strength at the overlapping portion can be further increased, and the trouble of arranging the truss bars 29 and 30 side by side can be saved.
[0048]
Therefore, as shown in FIGS. 17 (1) and (2), there is a difference in height between the lower truss muscle 30 and the other tall truss muscles 3 and 29 in the composite thin PC board 23. Then, the top concrete 26 is placed to form a stepped portion 31 as shown in FIG.
[0049]
It should be noted that the thin PC plates 1a, 1b, 1c, 1d, 1e, and 1f shown in FIGS. 4, 6, 7, and 8 can be used for the concrete slab 20 in place of the thin PC plate 1 shown in FIG. The same effects as those of the concrete slabs 10, 10a, 10b, 10c, and 10d can be achieved.
[0050]
Further, in the concrete slabs 10, 10a, 10b, 10c, 10d, and 20 shown in FIGS. 9, 12, 13, 14, 15, and 16, the horizontal bars are from a thin PC plate at one end to a thin PC at the other end. Although the bar is arranged over the plate, it may be a horizontal bar as shown in FIG.
[0051]
Moreover, when the steel structure, the reinforced concrete structure, and the steel reinforced concrete structure by the concrete slabs 10, 10a, 10b, 10c, and 10d of FIGS. 9, 11, 12, 13, 14, and 15 are constructed, the peripheral portion is strengthened. In addition, it is possible to construct a structure (not shown) including concrete slabs 10, 10a, 10b, 10c, and 10d that can flow a load acting on the peripheral portion in two directions along the truss and transverse bars.
[0052]
【The invention's effect】
It is possible to change the strength in the thin PC plate, that is, the strength of the portion where the lightweight mold is not disposed is larger than the portion where the lightweight mold is disposed.
[0053]
A large number of transverse bars intersecting with the truss bars can be arranged at the places where the small and light formwork is disposed.
[0054]
A gap where the top concrete can be struck more than the other can be formed on the concrete plate.
[0055]
The periphery of the concrete slab will be strengthened to withstand the shear forces acting on it.
[0056]
In the concrete slab where the small and lightweight formwork is disposed, a space portion can be formed in which the horizontal bars crossing the truss bars are arranged.
[0057]
The peripheral part of the concrete slab where a lot of top concrete is placed is strengthened, and the strength is enough to withstand the shearing force acting on it.
[0058]
The step portion can be easily formed in the concrete slab whose peripheral portion is reinforced.
[0059]
The load acting on the central part of the concrete slab on the short beam side can flow along the transverse bars.
[0060]
A load acting on the periphery of the concrete slab can be passed in two directions along the truss and transverse bars.
[0061]
Increases the integrity of the precast concrete plate at both ends and the precast concrete plate at the center of the concrete slab.
[0062]
It is possible to construct a structure including a concrete slab in which a peripheral portion is strengthened and a load acting on the peripheral portion can flow in two directions along the truss and transverse bars.
[Brief description of the drawings]
FIG. 1 is a plan view of a thin PC board.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG. 1, and (2) is a cross-sectional view taken along line CC in FIG.
FIGS. 4A and 4B are plan views of other thin PC plates. FIGS.
5 is a cross-sectional view taken along the line DD of (1) of FIG.
FIG. 6 is a plan view of another thin PC board.
7 (1) and (2) are plan views of other thin PC plates. FIG.
FIG. 8 is a plan view of another thin PC board.
FIG. 9 is a partially cutaway plan view of a concrete slab.
10 is a cross-sectional view taken along line EE of FIG.
FIG. 11 is a partially cutaway plan view of another concrete slab.
FIG. 12 is a partially cutaway plan view of another concrete slab.
FIG. 13 is a partially cutaway plan view of another concrete slab.
FIG. 14 is a partially cutaway plan view of another concrete slab.
FIG. 15 is a partially cutaway plan view of another concrete slab.
FIG. 16A is a partially cutaway plan view of a concrete slab having a stepped portion, and FIG. 16B is a cross-sectional view of the truss bar overlay.
17 is a cross-sectional view taken along line FF in FIG. 16, (2) is a cross-sectional view taken along line GG, and (3) is a cross-sectional view of a stepped portion formed by placing top concrete. .
FIG. 18 is a plan view of a concrete slab laid with a conventional thin PC board.
[Explanation of symbols]
1, 1a, 1b, 1c, 1d, 1e, 1f, 13, 35 Thin PC board 2 Concrete boards 3, 29, 30, 33 Truss bars 4, 5, 34 Light form 6 Upper chord 7 Lower chord 8 Lattice 9 Bending reinforcement 10, 10a, 10b, 10c, 10d, 20, 37 Concrete slabs 11, 21 Long beams 12, 22 Short beams 14, 24 Lower floor 15, 25 Slab upper bars 16, 26 Top concrete 23 Composite thin PC board 17, 18 Horizontal bars 19 Connecting bars 27, 28 Area 31 Stepped portion 36 Beam

Claims (3)

Truss bars are arranged on one side of a concrete board of a predetermined size with appropriate intervals, and a plurality of precast concrete boards with lightweight formwork arranged between these truss bars are arranged adjacent to each other between the beams. In the concrete slab formed by forming a floor and top concrete is placed on the lower floor, the inner side of the precast concrete plate arranged at least at both end sides of the lower floor with the truss bars in the middle as a boundary. A lightweight formwork is arranged between the truss bars, and a small and lightweight formwork smaller than the lightweight formwork is arranged at the center part or both end parts between the outer truss bars with the central truss line as a boundary. The horizontal bars that cross the truss bars are arranged between these lightweight formwork, and some of the horizontal bars cross from the precast concrete board at one end to the precast concrete board at the center. I, concrete slabs, characterized in that it is reinforcement to a precast concrete plate of the other end. A lightweight formwork is arranged between the inner truss bars of the center of the truss bars arranged at appropriate intervals on one surface of a concrete plate of a predetermined size. Thin precast concrete plates in which small and lightweight molds smaller than the lightweight molds are arranged at the center or both ends between the outer truss bars bordering the lines are arranged on both end sides between the beams, Between the thin-walled precast concrete plates, there are a thin-walled precast concrete plate in which a lightweight formwork is arranged between truss bars arranged at appropriate intervals on one surface of a concrete plate of a predetermined size, and a composite thin-walled precast concrete plate. Arranged adjacent to each other, a lower floor is formed, and top concrete is placed on the lower floor. Between the lightweight molds on the lower floor, horizontal bars crossing the truss bars are arranged. Some of the transverse bars are arranged from the thin precast concrete plate at one end to the thin precast concrete plate at the central portion and the composite thin precast concrete plate to the thin precast concrete plate at the other end. The composite thin-walled precast concrete board divides a concrete board of a predetermined size into predetermined areas, and arranges a tall truss bar in one area with an appropriate interval so that the upper part protrudes, and the other area The lower truss bars are arranged at appropriate intervals so that the upper part protrudes, and the ends of the tall truss bars and the lower truss bars are overlapped vertically at a predetermined location on the concrete plate. However, the step is formed with a difference in height between these tall truss muscles and the short truss muscles. Tosurabu. A structure comprising the concrete slab according to claim 1.

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