JP2931808B1 - Concrete slab - Google Patents

Abstract

Abstract: A concrete floor slab has a row of a rectangular concrete substrate on an upper surface having a narrower average width and a trapezoidal cross section than the concrete substrate along the long side direction thereof. Is formed. A plurality of concrete floor slabs 10 are bridged between beams 13, concrete 15 is poured so as to fill between adjacent concrete convex bodies 12, and concrete floor slabs 1
The concrete floor slab 17 is constructed by integrating the concrete 0 and the concrete 15 cast in place. [Effect] It is possible to reduce the amount of concrete to be cast at the construction site and the time for casting, and to construct a high-strength concrete slab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete slab which is integrated with concrete to be cast on site to form a part of the slab when constructing a reinforced concrete slab.

[0002]

2. Description of the Related Art In recent years, in the construction work of various structures made of reinforced concrete, shortage of skilled workers, shortening of construction period,
In order to pursue economics by standardizing designs, construction methods have been developed to reduce work such as formwork assembly, rebar arrangement, and concrete placement on site. That is, this is a method of producing various members constituting the concrete structure in a factory and assembling them on site.

For this reason, when constructing a reinforced concrete slab, a concrete slab constituting the lower surface side is factory-produced as a precast panel, and a plurality of concrete slabs are interposed between beams parallel to each other formed by precasting or cast in place. A construction method is adopted in which concrete is laid side by side, concrete is poured on it, and the concrete slab is integrated with cast-in-place concrete to form a slab.

Various techniques have been developed for such a construction method. For example, Japanese Patent Application Laid-Open Nos. 59-27050, 63-89760, and 5-51
No. 613, Japanese Unexamined Patent Publication No. 7-333183, and the like. The concrete floor slabs disclosed in these publications are formed by forming a plurality of ridges on a flat, corrugated or flat concrete substrate, and various concrete structures corresponding to the respective characteristics. Used in things.

[0005]

Problems to be Solved by the Invention
In the case of the conventional concrete floor slab disclosed in Japanese Patent No. 27050 or the like, since a plurality of ridges are provided, there is a problem that a large amount of cast-in-place concrete is required to fill the space therebetween.

[0006] In addition, the slabs constructed using these concrete slabs tend to have insufficient strength in the shearing direction because the area of the joint surface of the concrete increases.

[0007] Accordingly, an object of the present invention is to provide a concrete slab which can reduce the amount of concrete to be laid and the time of the laying work at a construction site and can construct a high-strength concrete slab. Is to do.

[0008]

In order to solve the above-mentioned problems, a concrete floor slab of the present invention is formed on one surface of a concrete substrate having a rectangular planar shape, a flat area smaller than that of the concrete substrate, and a peripheral edge. It is characterized in that a concrete convex body having a concave portion provided on an inclined surface is integrally formed.

[0009] With this configuration, the concrete floor slab of the present invention has a structure in which a concrete convex body having a constant plane area is provided on one side of a concrete substrate. When the plate members are arranged between the beams, the concrete projections and the planes formed by the flat portions of the concrete substrate are alternately arranged. Therefore, if the concrete is poured so as to fill the space between the adjacent concrete convex bodies, the concrete slab and the cast-in-place concrete are completely integrated, and a strong concrete slab can be constructed.

In this case, since the concrete floor slab is formed with a concrete convex body having a certain plane area, when the concrete slab is laid between the beams at the construction site, it is placed between the adjacent concrete slabs. If concrete is cast to fill the formed concave portion, the concrete slab and the cast-in-place concrete can be firmly integrated. Therefore, compared with the conventional concrete floor slab having a plurality of ridges on a flat concrete substrate, it is possible to reduce the amount of concrete to be placed at the construction site and the time required for the placing operation.

Further, by forming a concave portion on the inclined surface of the concrete convex body, the concrete poured in the site is filled in the concave portion and an anchor-like action is caused, so that the adhesive force between the inclined surface and the cast-in-place concrete is reduced. It can improve and build a high-strength concrete slab. in this case,
By forming a concave groove along the circumferential direction on the inclined surface of the concrete convex body, the adhesive force with the cast-in-place concrete can be further improved.

In the concrete floor slab of the present invention,
A structure in which a reinforcing bar is arranged in a direction intersecting with each other at the boundary between the concrete substrate and the concrete convex body in the cross section may be used. By adopting such a structure, the strength at the boundary between the concrete substrate and the concrete convex body, where stress is likely to concentrate, is increased, and the strength of the concrete floor slab itself is improved. The shear strength at the time of constructing a concrete floor slab integrated with the above is improved.

Further, the concrete substrate may have a structure in which an inclined surface is formed above the peripheral edge. By forming such an inclined surface, when concrete slabs are laid between beams at a construction site, V-shaped grooves are formed between adjacent concrete slabs, and the concrete cast in place is formed. Is filled in the V-shaped groove to strongly adhere the concrete slabs to each other, so that a high-strength concrete slab can be constructed.

On the other hand, in the concrete floor slab of the present invention,
It is desirable that the thickness of the concrete convex body be two to three times the thickness of the concrete substrate. By adopting such a shape, the amount of cast-in-place concrete can be reduced, a high-strength concrete slab can be constructed, and work time on site can be reduced. When the thickness of the concrete convex body is smaller than twice the thickness of the concrete substrate, the span is shortened, and the advantage of the present invention described above is impaired. The weight becomes too large, and the workability deteriorates.

In the concrete slab of the present invention,
It is desirable that the plane area of the concrete convex body be 0.6 to 0.7 times the plane area of the concrete substrate. With such a structure, the amount of cast-in-place concrete can be reduced, and a high-strength concrete slab can be constructed.

If the plane area of the concrete convex body is smaller than 0.6 times the plane area of the concrete substrate, the amount of concrete poured on site increases, and the strength in the shear direction tends to decrease. When it is larger than 0.7 times, the weight of the concrete floor slab itself becomes excessive and workability is reduced.

Further, in the concrete floor slab of the present invention, the inclination angle of the inclined surface of the peripheral edge of the concrete convex body is determined by:
It is desirable that the angle be 75 to 80 degrees based on the upper surface of the concrete substrate. By setting the inclined surface to such an inclination angle, the adhesiveness with the cast-in-place concrete is improved, and a high-strength concrete slab can be constructed. Becomes

When the inclination angle of the inclined surface is smaller than 75 degrees, the anchor function of the concave portion provided on the inclined surface is reduced, and when it is larger than 80 degrees, the filling property of the cast-in-place concrete is reduced.

Further, by providing a hollow portion in the cross section of the concrete convex body, the overall weight of the concrete floor slab can be reduced. Further, by providing a large number of irregularities on the upper surfaces of the concrete substrate and the concrete convex body, it is possible to further enhance the adhesion with the cast-in-place concrete.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing a concrete slab according to an embodiment, FIG. 2 is a longitudinal sectional view of the concrete slab, and FIG. 3 is a concrete slab constructed using the concrete slab. FIG. 4 is a longitudinal sectional view of a concrete slab constructed using the same concrete slab.

As shown in FIGS. 1 and 2, a concrete floor slab 10 of the present embodiment is formed on the upper surface of a concrete substrate 11 having a rectangular planar shape, has a smaller plane area than the concrete substrate 11, and is formed on the periphery. A concrete convex body 12 having a concave groove portion 12b provided on the inclined surface 12a is integrally formed.

Thus, the concrete slab 10 is
As shown in FIG. 3A, at the construction site, a plurality of concrete floor slabs 10 are connected to beams Between the concrete convex body 12 and the concrete substrate 11
The plane formed by 1a is alternately arranged.

Therefore, as shown in FIG. 3B, if the concrete 15 is cast so as to fill the space between the adjacent concrete convex bodies 12, the concrete floor slab 10 and the concrete 15 cast in place are completely formed. And a strong concrete floor slab 17 can be constructed. In this case, in this embodiment, the concrete 15 is cast after the reinforcing bars 19 are laid out vertically and horizontally on the concrete floor slab 10 bridged between the beams 13. Is strong.

The concrete floor slab 10 has a shape with a concrete convex body 12 having a smaller plane area than the concrete substrate 11. Floor slab material 10
The concrete floor slab 10 and the cast-in-place concrete 15 can be integrated by burying the concrete 15 enough to cover the reinforced material 19 by filling the concave portion 20 formed between the concrete 15 and the concrete 15. And the time required for the casting operation can be reduced.

In this case, since the concave groove 12b is provided along the circumferential direction on the inclined surface 12a of the concrete convex body 12, the concrete 15 cast on site has the concave groove 1b.
2b, and acts like an anchor, causing the slope 12
The adhesive strength between a and the concrete 15 cast in place is improved, and a high-strength concrete floor slab 17 can be constructed.

In the concrete floor slab 10, the reinforcing bars 21, 22 are provided in the cross section at the boundary between the concrete substrate 11 and the concrete convex body 12 and in the plane portion 11a in the longitudinal direction and the direction intersecting the same. And a PC steel wire 23 is arranged at the boundary. With such a structure, the strength of the boundary portion is increased, so that the shear strength when the concrete 15 is cast and the concrete floor slab 17 is constructed is improved. Moreover, in the concrete floor slab 10 of this embodiment,
A wire mesh 24 is arranged in the concrete substrate 11 to further increase the strength.

Furthermore, since the inclined surface 11c along the circumferential direction is formed in the upper part of the peripheral edge of the concrete substrate 11, when the concrete floor slabs 10 are arranged side by side between the beams 13, the adjacent concrete V-shaped grooves 25 are formed between the floor slabs 10 and concrete 1 cast in place.
5 is filled in the V-shaped groove 25 and the concrete slabs 10 are strongly bonded to each other, so that a high-strength concrete slab 17 can be constructed.

On the other hand, the concrete slab 1 of this embodiment
In the case of No. 0, the thickness of the concrete convex body 12 is set to 2.25 times the thickness of the concrete substrate 11 and the hollow part 12 c is provided in the cross section of the concrete convex body 12. 15 can be reduced, a high-strength concrete slab 17 can be constructed, and a weight that does not impair workability can be obtained.

Further, the concrete floor slab 1 of the present embodiment
0, the plane area of the concrete convex body 12 is 0.62 times the plane area of the concrete substrate 11, so that the amount of cast-in-place concrete can be reduced and a high-strength concrete slab can be constructed. Since the concrete convex body 12 is wider than the conventional floor slab having the ridges, it is also effective in ensuring the safety of the feet during work.

Further, in the concrete floor slab 10 of the present embodiment, since the inclination angle of the inclined surface 12a of the concrete convex body 12 is set to 77.5 degrees with respect to the flat portion 11a of the concrete substrate 11, it is cast in place. The concrete filling property is good, the adhesiveness with the cast-in-place concrete 15 is improved, and the concave groove portion 12b formed on the inclined surface 12a exhibits an excellent anchoring function, thereby constructing a high-strength concrete floor slab 17. Can be.

The concrete floor slab 1 of the present embodiment
In the case of No. 0, since a hook 12f for suspension by a crane or the like is provided on the upper surface of the concrete convex body 12, loading on a transporting vehicle and installation work at a construction site are easy.

FIG. 5 is a cutaway perspective view showing another embodiment of the present invention. In the concrete floor slab 30 of the present embodiment, a number of irregularities are provided on the upper surface 31a of the concrete substrate 31 and the upper surface 32a of the concrete convex body 32 to further improve the adhesion with the cast-in-place concrete 35. is there.

[0033]

According to the present invention, the following effects can be obtained.

(1) A concrete convex body having a plane area smaller than that of a concrete substrate and having a concave portion provided on an inclined surface formed on a peripheral edge is integrally formed on one surface of a concrete substrate having a rectangular planar shape. When a plurality of concrete floor slabs are laid side by side between the beams, the concrete convex bodies and the plane formed by the plane portion of the concrete board are alternately arranged, and the space between the adjacent concrete convex bodies is formed. If you put enough concrete to fill,
The concrete slab and the cast-in-place concrete can be completely integrated to form a strong concrete slab, and the amount of concrete laid and the time required for laying concrete at the construction site can be reduced. In addition, the concave portion of the peripheral inclined surface of the concrete convex body acts as an anchor, and the adhesive strength between the inclined surface and the cast-in-place concrete is improved.

(2) By providing a structure in which reinforcing bars are arranged in a direction crossing each other at the boundary between the concrete substrate and the concrete convex body in the cross section of the concrete floor slab, the strength at the boundary is increased. Therefore, the shear strength when a concrete floor slab is constructed by being integrated with cast-in-place concrete is improved.

(3) By forming an inclined surface at the upper part of the peripheral edge of the concrete substrate, when the concrete floor slabs are laid between the beams at the construction site, the V-shape is placed between the adjacent concrete floor slabs. A groove is formed, and concrete cast in place is filled in the V-shaped groove to strongly adhere the concrete floor slabs, so that a high-strength concrete floor slab can be constructed.

(4) By setting the thickness of the concrete convex body to two to three times the thickness of the concrete substrate, the amount of cast-in-place concrete can be reduced, and a high-strength concrete slab can be constructed. It is possible to increase the span while suppressing an increase in the weight of the concrete floor slab.

(5) By setting the plane area of the concrete convex body to 0.6 to 0.7 times the plane area of the concrete substrate, the amount of cast-in-place concrete is reduced and a high-strength concrete slab is constructed. Thus, the safety of the feet during the construction work is improved, and the strength in the shear direction can be improved.

(6) By setting the inclination angle of the inclined surface of the concrete convex body to 75 to 80 degrees with respect to the upper surface of the concrete substrate, the filling property and adhesion of the cast-in-place concrete are improved, and the concrete is formed on the inclined side surface. Since the anchor function of the concave groove portion is also improved, it is possible to construct a high-strength concrete slab excellent in integration.

(7) By providing a hollow portion in the cross section of the concrete convex body, the overall weight of the concrete floor slab can be reduced.

(8) By providing unevenness on the upper surfaces of the concrete substrate and the concrete convex body, the adhesion to the cast-in-place concrete can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a concrete floor slab according to an embodiment.

FIG. 2 is a longitudinal sectional view showing the concrete floor slab shown in FIG.

FIG. 3 is an explanatory view of a process when constructing a concrete slab using the concrete slab shown in FIG. 1;

4 is a vertical sectional view of a concrete slab constructed using the concrete slab shown in FIG.

FIG. 5 is a cutaway perspective view showing another embodiment.

[Explanation of symbols]

 10, 30 Concrete floor slab 11, 31 Concrete substrate 11a Flat surface 11c Inclined surface 12, 32 Concrete convex body 12a Inclined side surface 12b Concave groove 12f Hook 13 Beam 15, 35 Concrete 17 Concrete floor slab 19, 21, 22 Reinforcing material Reference Signs List 20 concave portion 23 PC steel wire 24 wire mesh 25 V-shaped groove 31a, 32a

Continuation of the front page (56) References JP-A-9-32174 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 5/38

Claims (8)

(57) [Claims] 1. A concrete floor slab in which a concrete convex body having a plane area smaller than that of a concrete substrate and having a concave portion formed on an inclined surface formed on a peripheral edge is integrally formed on one surface of a concrete substrate having a rectangular planar shape. Wood. 2. The concrete floor slab according to claim 1, wherein a reinforcing bar is arranged in a direction crossing each other at a boundary portion between the concrete substrate and the concrete convex body in a cross section of the concrete floor slab. 3. The concrete floor slab according to claim 1, wherein an inclined surface is formed at an upper part of a peripheral edge of said concrete substrate. 4. The thickness of the concrete convex body is 2-3 times the thickness of the concrete substrate.
The described concrete floor slab. 5. The concrete floor slab according to claim 1, wherein a plane area of the concrete convex body is 0.6 to 0.7 times a plane area of the concrete substrate. 6. The inclination angle of the inclined surface of the concrete convex body is 75 to 80 with respect to the upper surface of the concrete substrate.
The concrete floor slab according to any one of claims 1 to 5, which has a degree. 7. The concrete floor slab according to claim 1, wherein a hollow portion is provided in a cross section of the concrete convex body. 8. The concrete floor slab according to claim 1, wherein irregularities are provided on upper surfaces of said concrete substrate and said concrete convex body.