JP2000204706A - Precast concrete board, floor slab and building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete board, a floor slab and a building, in which the whole floor face is lightened while reinforcements can be arranged in response to load working to the floor slab. SOLUTION: In the precast concrete board 1, in which truss reinforcements 3 are arranged onto a concrete board 2 in specified size at proper intervals and parts of the truss reinforcements 3 are projected from one surface of the concrete board 2, at least one or more of large-sized lightweight forms 4, medium-sized lightweight forms and small-sized lightweight forms are disposed to sections 3a among the truss reinforcements in the concrete board 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete slab, a floor slab, and a construction.

[0002]

2. Description of the Related Art As shown in FIG. 15, a floor slab of a reinforced concrete structure is constructed by laying a precast concrete plate 47 in which a lightweight formwork 46 is arranged between truss bars 45 adjacent to a beam 48. Precast concrete board 47
Top concrete 49 is cast on the top to build.

[0003]

However, the loads acting on the central portion and the peripheral portion of the floor slab are different. In the peripheral portion where a large shearing force is applied, it is necessary to arrange reinforcing bars correspondingly. As described above, the floor slab constructed of the precast concrete plate provided with the light-weight formwork of a single size has not been provided with such a reinforcing bar.

The present invention has been made in view of these problems, and an object of the present invention is to reduce the weight of the entire floor slab and to provide a precast concrete plate capable of arranging reinforcing bars according to the load of the floor slab. Is to provide floor slabs and structures.

[0005]

According to a first aspect of the present invention, a truss bar is provided on a concrete plate of a predetermined size at an appropriate interval. In a precast concrete plate whose part protrudes from one surface of the concrete plate, at least one or more of a large and light form, a medium and light form, and a small and light form is disposed between trusses in the concrete plate. Features.

According to the first aspect of the present invention, at least one of a large and light formwork, a medium and light formwork, and a small and light formwork is disposed between the truss bars, thereby reducing the weight of the precast concrete plate. And the strength in the precast concrete plate can be varied.

According to a second aspect of the present invention, in the first aspect, the interval between the small and light-weight forms is wider than the interval between the medium- and light-weight forms.

According to the second aspect of the present invention, it is possible to arrange a large number of horizontal streaks that intersect with the truss streaks at locations where the spacing is wide.

The invention of claim 3 is the first or second invention.
In any one of the above, a plurality of truss bars are arranged at both end portions of the concrete plate.

According to the invention of claim 3, the strength of the joint between the precast concrete plates can be increased.

According to a fourth aspect of the present invention, in any one of the third aspects, one of the plurality of truss bars is shorter than the others.

According to the fourth aspect of the present invention, it is possible to arrange reinforcing bars in accordance with the strength in the precast concrete plate.

According to a fifth aspect of the present invention, a concrete plate having a predetermined size is divided into predetermined areas, and an upper portion of one of the divided areas is protruded from the upper surface of the concrete plate and is arranged at appropriate intervals. A high truss bar and a short truss bar whose upper part protrudes from the upper surface of the concrete plate in the other area and is arranged at appropriate intervals are superposed in a longitudinal direction at a predetermined location on the concrete plate, and the above-mentioned truss bars are laid. Characterized in that at least one of a large and lightweight formwork, a medium and light formwork, and a small and light formwork is disposed between the tall truss bars.

According to the fifth aspect of the present invention, a step is formed by a height difference between the tall truss and the short truss, and the strength at the boundary of the step can be increased. Thus, the weight of the entire floor slab can be reduced.

[0015] The invention of claim 6 is the first invention,
At least one or more of precast concrete plates of 2, 3, 4, and 5 are disposed adjacent to each other between beams to form a lower floor, and top concrete is cast on the lower floor. And

According to the sixth aspect of the present invention, it is possible to arrange reinforcing bars according to the load acting on the floor slab.

According to a seventh aspect of the present invention, there is provided a floor slab according to the sixth aspect.

According to the seventh aspect of the present invention, it is possible to construct a structure provided with a floor slab in which reinforcement is arranged according to the load.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a precast concrete plate according to the present invention will be described below with reference to FIGS. 1 to 8, and then an embodiment of a floor slab will be described with reference to FIGS.

FIG. 1 (1) is a plan view of the precast concrete plate of the first embodiment, and FIG. 1 (2) is (1).
(3) is a cross-sectional view taken along the line BB of (1).

Precast concrete plate (hereinafter referred to as thin P
A concrete plate 2 having a rectangular shape in plan view, a truss bar 3 arranged along the long side direction of the concrete plate 2, and a large lightweight formwork 4 disposed between the truss bars 3a
It is composed of

Five truss bars 3 are arranged at appropriate intervals with the upper part projecting from the upper surface of the concrete plate 2. The truss muscle 3 is a truss in which one upper chord muscle (top muscle) 6 and two lower chord muscles (lower muscle) 7 arranged in a triangular shape are joined by a lattice lattice 8 having a waveform. The side protrudes from the upper surface of the concrete plate 2, and the lower chordal bar 7 is joined to the bending reinforcing bar 9 in the concrete plate 2. The truss bars 3 are not limited to those described above, and may be a truss in which one upper chord and one lower chord are joined by a corrugated lattice.

Between these truss bars 3a, a large and lightweight formwork 4 having a length substantially equal to that of the truss bars 3 is provided. The large and lightweight formwork 4 has a height lower than that of the truss bars 3 and is not crushed by cast concrete. Specifically, a synthetic resin foam such as expanded polystyrene by foam molding in a bead mold is used. Although a molded article is used, it is also possible to use a foam molded article made of an ethylene-based resin, a propylene-based resin, or the like. The material of the lightweight formwork is not particularly limited as long as it is lighter than concrete, and may be a hollow steel pipe or the like.

FIG. 2 shows a thin PC board according to the second embodiment, which is a thin PC board 11 or 12 in which a large and light form 4 and a small and light form 5 are arranged. Among them, (1) is a thin PC board in which a large and light formwork 4 is provided between one truss 3a and a small and light form 5 is provided between the other truss 3a at the center of the truss 3. Reference numeral 11 denotes a thin PC board 12 in which the small and lightweight formwork 5 is provided only between the side truss bars 3a. By arranging the small and lightweight formwork 5 on the side in this way, a horizontal reinforcing bar crossing the truss bar 3 can be formed. In addition, it is also possible to arrange a small and light formwork between the truss bars on both sides and to provide a thin PC board having a large and light formwork between the remaining truss bars (not shown),
The locations of the large and lightweight formwork and the small and lightweight formwork can be changed according to the required strength.

FIG. 3 shows a thin PC board according to the third embodiment. The PC boards 13 and 14 are provided with a large and lightweight formwork 4, a medium and lightweight formwork 10, and a small and lightweight formwork 5. Fifteen. Among them, (1) and (2) are truss bars 3 at the center.
A large lightweight formwork 4 is placed between the three truss bars 3a
The thin PC boards 13 and 1 in which the medium and light formwork 10 and the small and light formwork 5 are arranged for each row of the other truss bar 3a.
In (1), the small and lightweight formwork 5 is disposed between the truss bars 3a at the center, and (2) is disposed oppositely between the truss bars 3a at both ends. In addition, a large-sized lightweight formwork may be provided at the center, and a medium-sized lightweight formwork and a small-sized lightweight formwork may be provided between truss bars on both sides (not shown). In (3), a medium- and light-weight formwork 10 is arranged in one row between the other truss bars 3a, and a small-and-lightweight formwork 5 is arranged in the other row.
In addition, the thin PC board 15 in which the arrangement interval 5a of the small and lightweight formwork is wider than the arrangement interval 10a of the medium and lightweight formwork. More top concrete can be cast between the wide arrangement intervals 5a than between the narrow arrangement intervals 10a. The width of the wide arrangement interval 5a can be set to an arbitrary width according to the strength. In addition, the medium-sized and lightweight formwork 10 having a wide arrangement interval 5a can be arranged also between the truss bars 3a on both sides (not shown).

FIG. 4 shows a thin PC board according to the fourth embodiment, which is a thin PC board 16 or 17 in which a lightweight form is not provided at all between the truss bars 3a. Of these, (1)
A thin PC board 16 in which a large lightweight formwork 4 is provided between one truss bar 3a and a light formwork is not provided at all between the truss bars 3a at the center. (2) The thin PC board in which the lightweight formwork is not disposed only between the truss bars 3a on one side and the large and lightweight formwork 4 and the small and lightweight formwork 5 are disposed between the other truss bars 3a. Seventeen. In addition, a thin PC board with no lightweight formwork only between the truss bars on both sides and a large lightweight formwork or a large lightweight formwork and a small lightweight formwork between the remaining truss bars (Not shown), and the location where the lightweight formwork is not provided can be changed according to the required strength. In such a place where the lightweight formwork is not provided, more concrete can be poured than in the place where the lightweight formwork is provided, and horizontal bars can be arranged between the small and lightweight formwork 5. .

FIG. 5 shows a thin PC board according to a fifth embodiment. A large and lightweight formwork is provided at the center of a concrete board 2 in which two truss bars 23 and 24 are arranged in close proximity at both ends. Reference numeral 4 denotes a thin PC board 18 having small and light form frames 5 disposed on both sides. This can save the labor of arranging the lightweight formwork, and can form a large number of horizontal streaks on both sides where a large shear force acts. Further, the strength of the joint between the thin PC boards can be increased.

FIGS. 6 and 7 show thin PC boards according to the sixth and seventh embodiments, in which one of the two truss bars 23 and 24 arranged close to each other has a half length. These are the thin PC boards 19, 20, 21, and 22. Fig. 6
(1) is a thin-walled PC in which the inner truss 24a is half the length and is arranged in one area of the concrete plate 2.
The plate 19. (2) in the same figure is the outer truss bar 2
Reference numeral 3a denotes a thin PC board 20 having a half length and arranged in one area of the concrete board 2. FIG. 7A shows a thin PC board 21 in which the inner truss bars 24a are half the length and one bar is provided in each of both areas of the concrete board 2. Also, (2) in the same figure shows a thin-walled P in which the outer truss bars 23a are half the length and one bar is arranged in each of both areas of the concrete plate 2.
C plate 22. Such a reinforcing arrangement is useful, for example, for reinforcement when forming a step.

FIG. 8 shows a thin PC board according to the eighth embodiment, in which a concrete board is divided into two areas 25 and 26, that is, two areas.
The tall truss bars 27 arranged in the area 5 and the short truss bars 28 arranged in the other area 26 are laterally overlapped and arranged at the center of the concrete plate 2 to be taller. Between the truss bars 27 is a thin PC board 29 on which the large and light formwork 4 having the same length as the truss bars is disposed. In addition, a method of disposing a lightweight formwork as shown in FIGS. It should be noted that the above-mentioned superposed reinforcing bars are arranged in the horizontal direction as well as in FIG.
As shown in (4), a tall truss bar 27 and a short truss bar 28 can be arranged vertically.

FIG. 9 shows a floor slab 30 according to the first embodiment, in which a thin PC board 1 is laid at a central portion surrounded by a long beam 31 and a short beam 32, and medium-sized and lightweight on both sides thereof. A thin PC board 33 on which the formwork 10 is disposed is laid and a lower floor 34 is provided.
Is formed, and a top concrete 36 is cast thereon with an upper slab reinforcement 35 disposed thereon. In addition, a joint bar 43 and a horizontal bar 44 are arranged between each thin PC board 1 and each of the beams 31 and 32 and at a joint between the thin PC boards 1. By arranging the thin PC board 1 at the central portion where a large shear force does not act as described above, the arrangement according to the load acting on the floor slab 30, that is, the arrangement that allows the load acting on the peripheral portion of the short beam 32 to flow in two directions. Streaks can be formed, and the weight of the entire floor slab can be reduced.

FIG. 10 shows a floor slab according to a second embodiment.
1. Thin P provided with the thin PC board 1 and the small and lightweight formwork 5 of FIG.
This is a floor slab 38 combined with a C plate 37. FIG.
1 shows a floor slab according to the third embodiment, which is a thin PC board 1 shown in FIG.
The floor slab 39 is a combination of the thin PC board 11 of FIG. In addition, the thin PC board 1 shown in FIG.
To any of the thin PC boards 11, 12, 13, 1 in FIG.
4, 15, 16, 17, 18, 19, 20, 21, 22
Can be combined with to form a floor slab.

FIG. 12 shows a floor slab according to a fourth embodiment, which is a floor slab 40 using the thin PC board 18 shown in FIG.
The strength of the joint between the thin PC boards 18 can be increased. In addition, the thin PC board 18 shown in FIG. 5 and any of the thin PC boards 11, 12, 1 shown in FIGS.
3, 14, 15, 16, 17, 19, 20, 21, 22
Can be combined with to form a floor slab.

FIG. 13 shows a floor slab according to a fifth embodiment, which is a floor slab 41 in which the thin PC board 29 of FIG. 8 and the thin PC board 1 of FIG. 1 are combined. As shown in FIG. 14, a tall truss bar 27 is provided between the area 25 where the large and lightweight formwork 4 is arranged on the thin PC board 29 of FIG. And short truss 2
8, that is, a step, and the top concrete 36 is driven into the step to form the step 42. In addition, the thin PC board 29 shown in FIG.
To any of the thin PC boards 11, 12, 13, 1 in FIG.
4, 15, 16, 17, 18, 19, 20, 21, 22
By constructing a floor slab by combining
The arrangement can be made such that the load acting on the peripheral portion of the second slab can flow in two directions, and the weight of the entire floor slab can be reduced.

The floor slabs 30, 37, 3 shown in FIGS.
8, 39, 40, 41 and the thin PC board 29 of FIG. 8 and any of the thin PC boards 11, 12, 13, 1 of FIGS.
4, 15, 16, 17, 18, 19, 20, 21, 22
When a steel frame structure, a reinforced concrete structure and a steel frame reinforced concrete structure are constructed by using a floor slab (not shown) formed by combining the above, the peripheral portion is strengthened and the load acting on the peripheral portion is applied to the truss bars 3 and the horizontal bars 44. Slabs 30, 37, 38, 39, 40, 41 that can flow in two directions along
Can be constructed (not shown).

[0035]

According to the present invention, it is possible to arrange a large number of horizontal streaks intersecting with the truss streaks at places where the arrangement intervals are wide.

The strength of the joint between the precast concrete plates can be increased.

[0036] Reinforcement according to the strength in the precast concrete plate can be formed.

A step is formed by the height difference between the tall truss and the short truss, and the strength at the boundary of the step can be increased.

[0039] Reinforcement can be arranged so that a load acting on the periphery of the short beam can flow in two directions, and the weight of the entire floor slab can be reduced.

Reinforcement can be arranged according to the load acting on the floor slab.

A construction having a floor slab in which reinforcing bars are arranged according to the load can be constructed.

[Brief description of the drawings]

1A is a plan view of a thin PC board according to a first embodiment, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 1B is a cross-sectional view taken along line BB.

FIGS. 2A and 2B are plan views of a thin PC board according to a second embodiment.

FIGS. 3A to 3C are thin PCs according to a third embodiment;
It is a top view of a board.

FIGS. 4 (1) and (2) are plan views of a thin PC board according to a fourth embodiment.

5A is a plan view of a thin PC board according to a fifth embodiment, FIG. 5B is a cross-sectional view taken along line CC, and FIG. 5C is a cross-sectional view taken along line DD.

FIGS. 6 (1) and (2) are plan views of a thin PC board according to a sixth embodiment.

FIGS. 7 (1) and (2) are plan views of a thin PC board according to a seventh embodiment.

8A is a plan view of a thin PC board according to an eighth embodiment, FIG. 8B is a cross-sectional view taken along line EE, FIG.
(4) is a cross-sectional view in which reinforcing bars are vertically arranged.

FIG. 9 is a partially cutaway plan view of the floor slab according to the first embodiment.

FIG. 10 is a partially cutaway plan view of a floor slab according to a second embodiment.

FIG. 11 is a partially cutaway plan view of a floor slab according to a third embodiment.

FIG. 12 is a partially cutaway plan view of a floor slab according to a fourth embodiment.

FIG. 13 is a partially cutaway plan view of a floor slab according to a fifth embodiment.

14A is a sectional view taken along line GG of FIG. 13, and FIG. 14B is a sectional view taken along line HH of FIG.

FIG. 15 is a plan view of a conventional floor slab.

[Explanation of symbols]

1, 11, 12, 13, 14, 15, 16, 17, 1
8, 19, 20, 21, 22, 29, 33, 37 Thin PC board 2 Concrete board 3, 23, 24, 45 Truss bars 4 Large and lightweight formwork 5 Small and lightweight formwork 6 Upper chord 7 Lower chord 8 Lattice 9 Bending reinforcement 10 Medium-sized lightweight formwork 25, 26 Area 27 Tall truss 28 Short truss 30, 30, 39, 40, 41 Floor slab 31 Long beam 32 Short beam 34 Lower floor 35 Slab upper end bar 36 , 49 Top concrete 42 Stepped part 43 Joint bar 44 Lateral bar 46 Lightweight formwork 47 Precast concrete plate 48 Beam

Claims (7)

[Claims] 1. A precast concrete plate in which truss bars are arranged at predetermined intervals on a concrete plate of a predetermined size, and a part of the truss bars protrudes from one surface of the concrete plate. A precast concrete plate, wherein at least one or more of a large and light formwork, a medium and light formwork, and a small and light formwork is disposed thereon. 2. The precast concrete plate according to claim 1, wherein an arrangement interval of the small and lightweight formwork is wider than an arrangement interval of the medium and lightweight formwork. 3. The precast concrete plate according to claim 1, wherein a plurality of truss bars are arranged at both ends of the concrete plate. 4. The precast concrete plate according to claim 3, wherein one of the plurality of truss bars is shorter than the others. 5. A tall truss bar in which a concrete plate of a predetermined size is divided into a predetermined area, and an upper portion is protruded from the upper surface of the concrete plate in one of the areas and arranged at appropriate intervals. In the area of the concrete truss, the upper part protrudes from the upper surface of the concrete plate, and the short truss bars arranged at appropriate intervals are superposed and arranged in the length direction at a predetermined location of the concrete plate, and A precast concrete plate provided with at least one of a large and light form, a medium and light form, and a small and light form. 6. The method according to claim 1, wherein at least one or more precast concrete plates according to claim 1, 2, 3, 4, 5,
A floor slab characterized by being disposed adjacent to a beam to form a lower floor, and top concrete being cast on the lower floor. 7. A construction comprising the floor slab according to claim 6.