JP3751747B2 - Precast concrete boards, concrete slabs and structures - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to precast concrete boards, concrete slabs and structures.
[0002]
[Prior art]
Most buildings, such as reinforced concrete structures, are constructed of precast concrete slabs with precast concrete plates. As shown in FIG. 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 an object of the present invention is to provide a precast concrete plate and a concrete slab in which the peripheral portion is strong enough to withstand the shearing force acting on the peripheral portion and the load on the peripheral portion flows in two directions. And to provide a construct.
[0005]
[Means for Solving the Problems]
The means for solving the above problems is that the precast concrete board is arranged on a concrete board of a predetermined size with the truss bars protruding from the upper part at appropriate intervals, with the truss bars at the center as the boundary. A small and lightweight formwork is arranged at appropriate intervals between the truss bars on the top surface of the concrete plate, and the space between the truss bars on the top surface of the other concrete plate with the truss bars in the middle is the boundary. A large, lightweight formwork of a size is provided, wherein one truss muscle and two bottom chords in which the truss bars are arranged in a triangle shape are joined by corrugated lattice muscles. To do.
In addition, the concrete slab is placed at appropriate intervals with a truss bar protruding from the top of a concrete plate of a predetermined size , and a small size between the truss bars on the upper surface of one concrete plate with the truss bar at the center as a boundary. Lightweight formwork is arranged at appropriate intervals, and a large lightweight formwork that is more than double the size of the small lightweight formwork is placed between the truss bars on the other concrete plate bordered by the truss bars in the center. A thin precast concrete plate in which one upper chord and two lower chords in which the truss bars are arranged in a triangle shape are joined by a corrugated lattice, the short beam side between the long beam and the short beam Between these thin-walled precast concrete plates, the upper part of a concrete plate of a predetermined size protrudes between truss bars arranged at appropriate intervals, and the size of the above small and lightweight formwork is less than A thin-walled precast concrete board with a large-sized lightweight formwork is installed adjacent to each other to form a lower floor, and a truss is placed between the lightweight formwork of the thin-walled precast concrete board on the short beam side of the lower floor. The horizontal bars perpendicular to the bars are arranged, and some of the horizontal bars cross the thin precast concrete plate in the center to the thin precast concrete plate on the other side, and the top concrete is placed on the lower floor. It is characterized by being made.
In addition, the concrete slab is placed at appropriate intervals with a truss bar protruding from the top of a concrete plate of a predetermined size, and a small size between the truss bars on the upper surface of one concrete plate with the truss bar at the center as a boundary. Lightweight formwork is arranged at appropriate intervals, and a large lightweight formwork that is more than double the size of the small lightweight formwork is placed between the truss bars on the other concrete plate bordered by the truss bars in the center. A thin precast concrete plate in which one upper chord and two lower chords in which the truss bars are arranged in a triangle shape are joined by a corrugated lattice, the short beam side between the long beam and the short beam Installed between these thin-walled precast concrete plates,
A thin-walled precast concrete board in which a large lightweight formwork that is at least twice as large as the above small lightweight formwork is disposed between truss bars arranged at appropriate intervals with the upper part protruding from a concrete board of a predetermined size When,
Divide a concrete board of a predetermined size into predetermined areas, and place a tall truss bar in one area with an appropriate interval so that the upper part protrudes, and a short truss bar in the other area. The upper and lower truss muscles are arranged at appropriate intervals so that the upper part protrudes, and the upper truss muscle and the lower truss muscle are composed of one upper and two lower chords arranged in a triangular shape. It is a triangular truss joined with bars, and the end of these truss bars are placed in the upper and lower parts of the concrete plate and placed in a composite precast concrete plate adjacent to each other to form a lower floor,
Between the lightweight formwork of the thin precast concrete board on the short beam side of the lower floor, transverse bars perpendicular to the truss bars are arranged, and some of these transverse bars are thin precast concrete boards and composite precast concrete boards in the center. Across the wall to the thin precast concrete plate on the other side, top concrete is placed on the lower floor, and there is a step in the place where the tall and short truss bars are placed Is formed .
Moreover, the structure is provided with said concrete slab.
[0006]
A small and lightweight formwork is arranged on one upper surface of the concrete plate facing the other, and a large and lightweight formwork larger than the small and lightweight formwork is arranged on the other upper surface. Can be eliminated and workability is improved.
[0007]
Since the transverse bars crossing the truss bars are arranged on one upper surface of the precast concrete plate on both sides in the long side direction of the lower floor, more bars are arranged than the transverse bars on the other upper surface. It is strong enough to withstand the shearing force acting there, and the load acting on the periphery flows in two directions along the truss and transverse muscles.
[0008]
A small and lightweight formwork is arranged on one upper surface of the precast concrete plate facing each other on both sides of the lower floor, and a large and lightweight formwork is arranged on the other upper surface rather than a small and lightweight formwork. The thickness can be reduced, and the weight of the slab can be reduced.
[0009]
Some of the horizontal bars are arranged from one side of the precast concrete board to the center part of the precast concrete board to the other side of the precast concrete board. The unity with the precast concrete board of the part is improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the precast concrete board and concrete slab of the present invention will be described with reference to the drawings. 1 is a plan view of a precast concrete plate, FIG. 2 (1) is a cross-sectional view taken along line AA in FIG. 1, (2) is a cross-sectional view taken along line BB in FIG. 1, and FIG. FIG.
[0011]
FIG. 1 shows a precast concrete board (hereinafter referred to as a thin PC board) 1, which is composed of a planar rectangular concrete board 2, truss bars 3, and lightweight molds 4 and 5.
[0012]
The thin PC board 1 has a predetermined size and a predetermined thickness. Truss bars 3 along the long side direction are arranged at appropriate intervals in the short side direction, and the truss bar 3 at the center is defined as a boundary. Between the truss bars 3 on the one upper surface facing each other, small and light molds 4 are arranged at appropriate intervals, and between the truss bars 3 on the other upper surface are larger than the small and light molds 4 by a factor of two or more. A large lightweight mold 5 is provided.
[0013]
These lightweight molds 4 and 5 are lower than the truss bars 3 and are not crushed by the cast concrete, and specifically, synthetic resin foam molding by in-mold foam molding such as foamed polystyrene. In addition, it is also possible to use a foam molded article made of an ethylene resin, a propylene resin, or the like. The material of the lightweight molds 4 and 5 is not particularly limited as long as it is lighter than concrete, and may be a hollow steel pipe.
[0014]
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.
[0015]
FIG. 4 shows a concrete slab 10 using the thin PC plate 1 described above, and the thin PC plate 1 is laid on both sides between the long beam 11 and the short beam 12, that is, only on the short beam 12 side. A normal thin PC board 13 is laid adjacently between the PC boards 1 to form a lower floor 14, and a slab upper end bar 15 is arranged on the lower floor 14 and a top concrete 16 is placed thereon.
[0016]
One row of eight small and lightweight molds 4 are arranged on one upper surface of the thin PC board 1 on both sides of the lower floor 14, and two rows of four large and lightweight molds 5 are arranged on the other upper surface. In addition to being arranged one by one, four rows of four large and lightweight molds 5 are arranged on the thin PC board 13 at the center of the lower floor 14. The small lightweight mold 4 is less than half the size of the large lightweight mold 5, and the size is determined by the number of horizontal stripes.
[0017]
Nine horizontal bars 17, 18 perpendicular to the truss bar 3 are arranged at appropriate intervals on the thin PC board 1 on both sides of the lower floor 14, and three of these horizontal bars 17 are thin PC at the center. A bar is arranged across the board 13 to the thin PC board 1 on the other side. Accordingly, as a whole of the concrete slab 10, the lateral bars 17 and 18 more than double (9 compared to 3) the horizontal bars 17 and 18 are arranged in a part of the thin PC board 1 on both sides compared to the thin PC board 13 in the center part. ing. The three transverse bars 17 serve to join the thin PC plates 1 and 13, and the remaining six transverse bars 18 also increase the joining strength between the thin PC plate 1 and the short beam 12.
[0018]
Thus, by arranging the horizontal bars 17 and 18 that are more than double the thickness of the thin PC board 13 in the central part on a part of the thin PC board 1 on both sides of the lower floor 14, the peripheral part of the concrete slab 10 is The strength that can withstand the shearing force acting there, and the load acting on the peripheral portion can flow in two directions along the truss muscle 3 and the transverse muscles 17 and 18.
[0019]
The transverse bars 17 and 18 use one or more deformed reinforcing bars or truss bars, and can be formed by connecting those having a predetermined length by welding or the like. As the truss reinforcement, a triangular truss or an I-shaped truss can be used as described above.
[0020]
FIG. 5 shows a concrete slab 20 having a step portion using the above thin PC plate 1, and the thin PC plate 1 laid on both sides between the long beam 21 and the short beam 22, that is, only on the short beam 22 side. A lower floor 24 is formed from a normal thin PC board 13 and a composite precast concrete board (hereinafter referred to as composite thin PC board) 23 laid between these thin PC boards 1, and a slab upper end bar 25 is formed on the lower floor 24. Are arranged and the top concrete 26 is placed.
[0021]
The composite thin-walled PC board 23 has a tall truss bar 29 arranged in one of the two divided areas 27 and 28 along the long side direction. A large lightweight mold 5 is provided. On the other hand, in the other area 28, short truss bars 30 are arranged at appropriate intervals, and end portions thereof are overlaid on the tall truss bars 29. In addition to the truss bars 29 and 30 being attached side by side, the superposed bars can be superposed vertically as shown in FIG. As a result, the strength at the overlapping portion can be further increased, and the labor of shifting the truss bars 29 and 30 to each other can be saved.
[0022]
Therefore, as shown in (1) and (2) of FIG. 6, the lower truss muscle 30 of the composite thin PC board 23, the truss muscle 3 of the normal thin PC board 13, and the back of the back of the composite thin PC board 23. A difference in height is generated between the low truss bar 30 and the tall truss bar 29, and the top concrete 26 is placed therewith to form a step portion 31 as shown in FIG. 6 (3).
[0023]
Further, when a steel structure, reinforced concrete structure, or steel reinforced concrete structure is constructed by the concrete slabs 10 and 20 of FIGS. 4 and 5, the peripheral portion is made strong enough to withstand the shearing force acting on the structure, and acts on the peripheral portion. A structure (not shown) including the concrete slabs 10 and 20 capable of flowing the load in two directions along the truss and transverse bars can be constructed.
[0024]
【The invention's effect】
A small and lightweight formwork is arranged on one upper surface of the concrete plate facing the other, and a large and lightweight formwork larger than the small and lightweight formwork is arranged on the other upper surface. Can be eliminated and workability is improved. Further, it is possible to dispose a lightweight mold according to the load acting on the precast concrete board. Furthermore, a precast concrete board can be arrange | positioned in the location where big load acts, such as a piano.
[0025]
Since the transverse bars crossing the truss bars are arranged on one upper surface of the precast concrete plate on both sides in the long side direction of the lower floor, more bars are arranged than the transverse bars on the other upper surface. It becomes the strength which can endure the shear force which acts there, and the load which acts on a peripheral part can be sent in two directions along a truss and a transverse muscle.
[0026]
A concrete slab having a stepped portion can be easily constructed, and a load acting on the central portion of the concrete slab can flow in two directions along the truss and transverse bars.
[0027]
A small and lightweight formwork is disposed on one upper surface of the thin PC plate facing each other on both sides in the long side direction of the lower floor, and a large and lightweight formwork larger than the small and lightweight formwork is provided on the other upper surface. Since the slab thickness can be reduced by the arrangement, the slab can be reduced in weight.
[0028]
Some of the horizontal bars are arranged from the thin PC board on one side to the thin PC board on the other side to the thin PC board on the other side. The integrity with the thin PC board of the part can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view of a thin PC board.
2 is a cross-sectional view taken along line AA in FIG. 1, and (2) is a cross-sectional view taken along line BB in FIG.
3 is a cross-sectional view taken along the line CC in FIG. 1. FIG.
FIG. 4 is a plan view of a concrete slab.
5A is a plan view of another concrete slab, and FIG. 5B is a cross-sectional view of the truss bar overlay.
6 is a cross-sectional view taken along the line DD of FIG. 5, (2) is a cross-sectional view taken along the line EE of FIG. 5, and (3) is a cross-sectional view of the stepped portion.
FIG. 7 is a plan view of a conventional concrete slab.
[Explanation of symbols]
1, 13, 35 Thin PC plate 2 Concrete plate 3, 29, 30, 33 Truss bars 4, 5, 34 Lightweight form 6 Upper chord 7 Lower chord 8 Lattice 9 Bending reinforcement 10, 20, 37 Concrete slab 11, 21 Long beams 12 and 22 Short beams 14 and 24 Lower floor 15 and 25 Slab upper end bars 16 and 26 Top concrete 23 Composite thin-walled PC board 17 and 18 Horizontal bars 27 and 28 Area 31 Stepped portion

Claims (4)

Truss bars are placed on a concrete board of a predetermined size with the upper part protruding at appropriate intervals , and a small lightweight formwork is appropriately spaced between the truss bars on the upper surface of one concrete board with the truss bars in the center as a boundary. Between each truss bar on the upper surface of the other concrete plate with the truss bar in the middle as a boundary, a large and lightweight mold frame that is more than double the size of the small and lightweight mold frame is arranged. A precast concrete board characterized in that one upper chord and two lower chords arranged in a triangular shape are joined by a corrugated lattice . Truss bars are placed on the concrete board of a predetermined size with the upper part protruding at appropriate intervals, and a small and lightweight formwork is appropriately placed between the truss bars on the upper surface of one concrete board with the truss bars at the center as a boundary. A large and lightweight formwork that is more than double the size of the small and lightweight formwork is arranged between the truss bars on the top surface of the other concrete plate with the truss bars at the center as the boundary. A thin-walled precast concrete plate made by connecting one upper chord and two lower chords arranged in a triangular shape with corrugated lattice bars is installed on the short beam side between the long beam and the short beam. Between the thin precast concrete plates, there is a large lightweight formwork that is more than double the size of the above lightweight lightweight formwork between the truss bars that are arranged at appropriate intervals by protruding the upper part of the concrete plate of a predetermined size. The installed thin precast concrete board is installed adjacently to form a lower floor, and between the lightweight formwork of the thin precast concrete board on the short beam side of the lower floor, transverse bars perpendicular to the truss bars are arranged, A concrete slab characterized in that several of these horizontal bars are laid across the thin precast concrete plate at the center to the thin precast concrete plate on the other side, and top concrete is cast on the lower floor. . Truss bars are placed on the concrete board of a predetermined size with the upper part protruding at appropriate intervals, and a small and lightweight formwork is appropriately placed between the truss bars on the upper surface of one concrete board with the truss bars at the center as a boundary. A large and lightweight formwork that is more than double the size of the small and lightweight formwork is arranged between the truss bars on the top surface of the other concrete plate with the truss bars at the center as the boundary. A thin-walled precast concrete plate made by connecting one upper chord and two lower chords arranged in a triangular shape with corrugated lattice bars is installed on the short beam side between the long beam and the short beam. Between the thin precast concrete plates
A thin-walled precast concrete board in which a large lightweight formwork that is at least twice as large as the above small lightweight formwork is disposed between truss bars arranged at appropriate intervals with the upper part protruding from a concrete board of a predetermined size When,
Divide a concrete board of a predetermined size into predetermined areas, and place a tall truss bar in one area with an appropriate interval so that the upper part protrudes, and a short truss bar in the other area. The upper and lower truss muscles are arranged at appropriate intervals so that the upper part protrudes, and the upper truss muscle and the lower truss muscle are composed of one upper and two lower chords arranged in a triangular shape. It is a triangular truss joined with bars, and the end of these truss bars are placed in the upper and lower parts of the concrete plate and placed in a composite precast concrete plate adjacent to each other to form a lower floor,
Between the lightweight formwork of the thin precast concrete board on the short beam side of the lower floor, transverse bars perpendicular to the truss bars are arranged, and some of these transverse bars are thin precast concrete boards and composite precast concrete boards in the center. Across the wall to the thin precast concrete plate on the other side, top concrete is placed on the lower floor, and there is a step in the place where the tall and short truss bars are placed Concrete slab characterized by the formation of   A structure comprising the concrete slab according to claim 2.

Images