JPH11172827A - Precast concrete slab, concrete slab, and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide precast concrete slab, concrete slab and structure capable of arranging balanced bars to two directions (vertical and horizontal directions) of long side direction and short side direction in the case the precast concrete slab arranging lightweight forms thereon is used to construct the concrete slab. SOLUTION: Nruss bars 3 are arranged on a concrete slab 2 with specific size at proper intervals, and part of the truss bars 3 is projected from one side of the concrete slab 2. In that case, lightweight forms are arranged between the truss bars 3 at proper intervals and, at the same time, a plurality of truss bars 3 are approached to both sides of a long side direction of the concrete slab 2 and are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Most slabs of reinforced concrete are constructed of precast concrete plates. To reduce the weight of the precast concrete plates, as shown in FIG. A precast concrete plate 23 provided with a frame 22 is often used.

[0003]

When a precast concrete plate in which truss bars and lightweight formwork are laid at equal intervals as described above is installed adjacent to a beam, the truss bars are formed at the joint in the long side direction. Since the reinforcing bars are arranged in the proximity state, there is a problem that the entire floor is in an unbalanced reinforcing state in which only one direction in the long side direction is reinforced.

The present invention has been made in view of these problems, and an object of the present invention is to construct a concrete slab using a precast concrete plate on which a light-weight formwork is disposed, in a case where a long side direction and a short side are used. An object of the present invention is to provide a precast concrete plate, a concrete slab, and a structure capable of performing balanced arrangement of reinforcement in two directions (longitudinal direction and lateral direction) in the side direction.

[0005]

Means for solving the above problems are as follows. A precast concrete plate is provided with truss bars arranged at appropriate intervals on a concrete plate of a predetermined size, and a part of the truss bars is formed. In the precast concrete plate protruding from one surface of the concrete plate, a lightweight formwork is disposed between the truss bars at appropriate intervals, and a plurality of truss bars are adjacent to both sides in the long side direction of the concrete plate. It is characterized by being arranged.
In addition, the concrete slab arranges truss bars on a concrete plate of a predetermined size at appropriate intervals, and arranges lightweight formwork between these truss bars at appropriate intervals, and on both sides in the long side direction of the concrete plate. A plurality of precast concrete plates having a plurality of truss bars are disposed adjacent to each other between beams, and top concrete is cast on these precast concrete plates. Furthermore, a structure is provided with the concrete slab described above.

By arranging a plurality of truss bars close to both sides in the long side direction of the concrete plate, the strength of the joint between the precast concrete plates can be reinforced according to the required strength of the slab.

[0007] When any of the plurality of truss bars is shorter than the others, it is possible to arrange the slabs according to partially different strengths.

Since the length of the lightweight formwork in the long side direction is equal to or less than the spacing of the truss bars, the lightweight formwork can be divided into small portions corresponding to the spacing of the reinforcing bars arranged in the lateral direction of the concrete plate. Can be arranged.

Since at least one of the intervals between the arrangements of the lightweight forms is wider than the other arrangement intervals, a group of lightweight forms in which the lightweight forms are evenly arranged is formed on both sides. Reinforcing bars corresponding to the truss bars can be arranged at wide intervals.

[0010] By providing a plurality of truss bars on both sides in the longitudinal direction of the concrete plate, the strength of the slab at the joint of the precast concrete plate can be reinforced.

Reinforcing bars corresponding to the truss bars can be provided in the wide gaps between the light-weight forms, so that the reinforcing bars are balanced in the vertical and horizontal directions as the whole concrete slab.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the precast concrete plate of the present invention will be described below with reference to the drawings. 1 is a plan view of a precast concrete plate, and FIG. 2 is FIG.
3 is a sectional view taken along the line bb of FIG.

FIG. 1 shows a precast concrete plate 1, which is composed of a flat rectangular concrete plate 2, a truss bar 3, and a lightweight formwork 4.

The precast concrete plate 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. Two truss bars 3, that is, an inner truss bar 3a and an outer truss bar 3b are arranged close to each other on both sides in the side direction. Light-weight forms 4 are disposed at appropriate intervals between the truss bars 3 and 3a, and small- and light-weight forms 4a are disposed on both sides.

These lightweight formwork 4 has substantially the same height as the truss bars 3, and the length in the long side direction is equal to or less than the spacing of the truss bars 3, that is, the space a in FIG. As the lightweight formwork 4, one that does not crush by the concrete to be cast is used. For example, a synthetic resin foam molded product such as expanded polystyrene is used. However, besides this, it is also possible to use a foamed molded product made of an ethylene resin, a propylene resin or the like. The material of the lightweight formwork is not particularly limited as long as it is a lightweight member for concrete, and a hollow steel pipe may be used.

The truss bars 3, 3a, 3b are trusses in which one upper bar 5 and two lower bars 6 arranged in a triangular shape are joined by a lattice lattice 7 having a waveform. The lower end bar 6 protrudes from the upper surface of the concrete plate 2 and is embedded in the concrete plate 2 so that the lower end line 8 of the slab is formed.
Is joined to. The truss bars 3 are not limited to those described above, and may be a truss in which one upper bar and one lower bar are joined by a corrugated lattice bar.

FIG. 4 shows another precast concrete plate 1.
(1) shows two truss bars 3 arranged in close proximity
a, the inner truss bar 3a of 3b is half the length,
In addition, reinforcing bars are arranged only on one side of the concrete plate 2. Also, (2) in the figure is a precast concrete plate 1 in which the outer truss bars 3b are half the length, contrary to the above. Such a reinforcing bar can be reinforced, for example, when a step is formed, so that a reinforcing bar according to a required strength can be formed.

FIG. 5 shows another precast concrete plate 1.
(1) shows two truss bars 3 arranged in close proximity
Among them, the inner truss bars 3a are half the length, and one bar is arranged on each side of the concrete plate 2. On the other hand, in (2) of the same figure, on the contrary, the outer truss bar 3b has a half length. The above (1) and (2) can also be arranged according to the required strength similarly to the above.

FIG. 6 shows a precast concrete plate 1 in which the arrangement intervals at the center of the lightweight formwork 4 of the precast concrete plate 1 of FIG.
The wide arrangement gap 9 has a space where a plurality of round bars or truss bars can be arranged in close proximity, and the lightweight formwork 4 is evenly arranged on both sides of the concrete plate 2 centered on this. The formed lightweight form group 10 is formed.

FIG. 7 shows a lightweight form 4 and a small and lightweight form 4 at the center of the precast concrete plate 1 of FIG.
The arrangement interval of “a” is wider than others. Further, FIG. 8 shows that the arrangement interval of the lightweight formwork 4 in the central portion of the precast concrete plate 1 of FIG. These are also the precast concrete plate 1 shown in FIG.
The same effect as described above can be achieved.

Next, concrete slabs constructed using some of the precast concrete plates shown in FIGS. 1, 4 to 8 (hereinafter referred to as hollow precast concrete plates) will be described with reference to FIGS. 9 to 11. explain. FIG. 9 is a plan view of a concrete slab, and FIG.
It is each sectional drawing of.

FIG. 9 shows the hollow precast concrete plate 1 and the composite precast concrete plate 1 shown in FIG.
1 is a concrete slab 13 laid alternately and adjacently between the beams 12, a top slab reinforcement 14 is arranged on the precast concrete plates 1, 11, and a top concrete 15 is cast thereon. I have.

The composite precast concrete plate 11 adjacent to the hollow precast concrete plate 1 has one of the two divided areas 16 and 17.
6, the tall truss bars 3 are arranged along the long side direction, and the other area 17 is provided with the short truss bars 1.
8 are arranged at appropriate intervals, and the ends thereof are arranged to overlap the tall truss bars 3.

Between these tall truss bars 3, lightweight formwork 4 whose length in the long side direction is equal to or less than the bar arrangement interval a of the truss bars is disposed at appropriate intervals. Therefore, there is a difference in height between the tall truss bars 3 and the short truss bars 17, and the top concrete 15 is cast with this difference to form a step 19 (FIG. 10).

The hollow precast concrete plate 3 adjacent to the step 19 has double truss bars 3a,
3b is arranged to reinforce the joint with the step portion 19.

A connecting bar 20 such as a round bar corresponding to the truss bar 3 is arranged between the lightweight formwork 4, and the adjacent truss bars 3 and 3b Are connected to each other, so that the entire slab is balanced in two directions.

As described above, the joint portion with the step portion 19 is reinforced by the double truss bars 3a, 3b, and the concrete slab 13 is arranged as a whole with balanced reinforcement in two directions.

FIG. 11 shows a concrete slab 13 in which the precast concrete plate 1 of FIG. 6 is laid between beams 12, and a connecting bar 20 corresponding to the truss bar 3 is also provided between the lightweight formwork 4 in the same manner as described above. Four connecting bars 20 corresponding to the truss bars 3a and 3b close to the joint are provided in the wide arrangement gap portion 9 while being provided. Also in this case, it is possible to provide reinforcing bars balanced in the vertical and horizontal directions in the same manner as described above.

Further, a concrete slab different from those shown in FIGS. 9 and 11 can be constructed using the hollow precast concrete plate 1 shown in FIGS. 1, 4, 5 and 7 (not shown). Any of these concrete slabs can be provided with balanced reinforcement in two directions.

The concrete slab 1 shown in FIGS.
3, steel, reinforced concrete and steel reinforced concrete structures are constructed using concrete slabs made of the precast concrete plates 1 of FIGS. 1, 4, 5, and 7, whereby the steps are reinforced and the entire structure is strengthened. As a result, a structure with a well-balanced concrete slab can be constructed.

[0031]

According to the present invention, the strength at the joint between adjacent precast concrete plates can be increased.

By arranging a plurality of truss bars close to both sides in the long side direction of the concrete plate, the strength of the joint between the precast concrete plates can be reinforced according to the required strength of the slab.

Since one of the plurality of truss bars is shorter than the others, it is possible to arrange the slabs in accordance with partially different strengths.

Since the length of the lightweight form in the long side direction is equal to or less than the spacing of the truss bars, the lightweight form corresponding to the spacing of the reinforcing bars arranged in the lateral direction of the concrete plate is provided. Can be.

Since at least one of the arrangement intervals of the lightweight formwork is wider than the other arrangement intervals, a reinforcing bar corresponding to the truss bar can be arranged in the wide arrangement interval. Further, on both sides of the wide disposition interval, a lightweight form group in which the lightweight forms are uniformly arranged is formed.

By providing a plurality of truss bars on both sides in the longitudinal direction of the concrete plate, the strength of the slab at the joint of the precast concrete plate can be reinforced.

Since the reinforcing bars corresponding to the truss bars can be arranged in the wide gap of the light formwork, the reinforcing bars are balanced in the vertical and horizontal directions as the whole concrete slab.

[Brief description of the drawings]

FIG. 1 is a plan view of a precast concrete plate.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is a sectional view taken along line bb of FIG. 1;

FIGS. 4 (1) and (2) are plan views of another precast concrete plate.

FIGS. 5 (1) and (2) are plan views of other precast concrete plates.

FIG. 6 is a plan view of a precast concrete plate.

FIGS. 7 (1) and (2) are plan views of a precast concrete plate.

FIG. 8 is a plan view of a precast concrete plate.

FIG. 9 is a partially cutaway plan view of a concrete slab.

10A is a cross-sectional view taken along line cc of FIG. 9, FIG. 10B is a cross-sectional view taken along line dd of FIG. 9, and FIG.

FIG. 11 is a partially cutaway plan view of a concrete slab.

FIG. 12 is a plan view of a conventional precast concrete plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 precast concrete board 2 concrete board 3, 3 a, 3 b truss bar 4 lightweight formwork 5 upper bar 6 lower bar 7 lattice bar 8 lower slab bar 9 wide arrangement gap 12 beam 13 concrete slab 15 top concrete 20 connecting bar

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isao Aoki 3-6-4 Ogawa, Machida-shi, Tokyo (72) Inventor Hiroshi Sano 40-18 Katakuracho, Hachioji-shi, Tokyo (72) Inventor Ryoji Ryoji Kanagawa 2-17-15 Yasaka, Sagamihara-shi (72) Inventor Fucho Sawai 1852-27, Omuro, Kashiwa-shi, Kashiwa-shi, Chiba 118-1 (72) Inventor Kazuhiro Watanabe 4-8-3, Nishigotanda, Shinagawa-ku, Tokyo (72) Inventor Yoshihiro Okabe 4-2-11 Nukiminamicho, Koganei-shi, Tokyo (72) Inventor Naoto Yasuda 3-25-6-302, Inusa, Suginami-ku, Tokyo 31-8 (72) Inventor Terumaro Nagai 1-5-3 Midori, Kurihashi-cho, Kita-Katsushika-gun, Saitama

Claims (9)

[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 frames are arranged at appropriate intervals, and a plurality of truss bars are arranged close to both sides in the long side direction of the concrete plate. 2. The precast concrete according to claim 1, wherein one of the plurality of truss bars arranged near both sides in the long side direction of the concrete plate is shorter than the others. Board. 3. The precast concrete plate according to claim 1, wherein a length of the lightweight form in a long side direction is equal to or less than a spacing of truss bars. 4. The precast concrete plate according to claim 1, wherein at least one of the intervals at which the lightweight formwork is arranged is wider than the other intervals. 5. A truss bar is arranged on a concrete plate of a predetermined size at an appropriate interval, lightweight formwork is arranged at an appropriate interval between these truss bars, and both sides of the concrete plate in the long side direction. A concrete slab comprising a plurality of precast concrete plates having a plurality of truss bars arranged adjacently between beams, and top concrete being cast on these precast concrete plates. 6. The concrete slab according to claim 5, wherein one of the plurality of truss bars is shorter than the others. 7. The concrete slab according to claim 5, wherein a length of the lightweight formwork in a long side direction is equal to or less than an arrangement interval of the truss bars. 8. The concrete slab according to claim 5, wherein at least one row of the arrangement intervals of the lightweight formwork is wider than other arrangement intervals. 9. A structure comprising the concrete slab according to claim 5.