JPH08239934A - Upper surface step structure of floor slab - Google Patents

Abstract

PURPOSE: To improve construction efficiency by a method wherein a hollow section is provided in a reinforced concrete floor slab to elevate the upper surface of the floor slab and the hollow section is partially limited to partially lower the upper surface of the slab thereby to form a step on the upper surface. CONSTITUTION: In order to lower the upper surface of a floor slab 1 around a water piping which requires an underfloor piping space, hollow sections 3 are provided in the floor slab 1 excluding a space for water piping to increase the thickness of the slab without increasing the weight of the slab. Next, the hollow sections 3 are filled with lightweight material such as expanded resin. And a belt-shaped border portion B including no hollow section 3 and having the same thickness as a high portion H of the floor slab 1 is provided along the boundary between a low portion L including no hollow section 3 and the high portion H including hollow sections 3. And flow of forces between the high portion H and the low portion L is made smooth at the border portion B. Further reinforcing bars 4H, 4L of the high and low portions are connected at the border portion B to prevent the lowering of strength. As a result, arrangement of forms, bar arrangement, concrete casting can be easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor slab upper surface step structure, and more particularly to a structure in which a step is provided on the upper surface of the floor slab to form a lower portion and the lower surface of the floor slab is flat without a step.

[0002]

BACKGROUND OF THE INVENTION Not only individual residences but also condominiums and hotels are required to have the same height of floor finish surfaces so that they are flush with each other, which is a very important factor for obtaining a comfortable living environment.

In order to make the height of the floor finish surface uniform, a step is provided on the upper surface of the floor slab in the bathroom, washroom, toilet, etc. which requires piping space under the floor, that is, the floor slab around the water is lowered. It is formed, and specifically, the following structure is adopted.

As shown in FIG. 10, a step D'is formed on a slab form (not shown) forming the lower surface of the floor slab 1, and the upper surface of the floor slab 1 is provided with a step D by a stop form (not shown).
A structure for attaching concrete and placing concrete. In this case, the thickness of the floor slab is constant in both the high part and the low part of the upper surface of the floor slab.

As shown in FIG. 11, a precast concrete panel 2 is used in place of the slab form, the precast concrete panel 2 is divided and laid with steps, and the upper surface of the floor slab 1 is a stop form. A structure in which concrete is poured after a step D is formed by a not-shown structure. In this case as well, the thickness of the floor slab is constant in both the high portion H and the low portion L of the upper surface of the floor slab 1, as described above.

As shown in FIG. 12, the structure is such that the upper surface of the floor slab 1 in the water supply portion L is not lowered but is increased by increasing the upper surface of the floor slab 1 in the other portion H and pouring concrete C. In this case, the thickness of the high portion H on the upper surface of the floor slab 1 is increased, and the thickness of the portion C is higher than that of the lower portion L because the concrete C is cast.

As shown in FIG. 13, a structure using a precast concrete panel 2 instead of the slab formwork. In this case as well, the thickness of the high portion H of the upper surface of the floor slab 1 is increased and the thickness of the lower portion K is increased by the amount of the concrete C placed.

[0008]

In the above, not only is it troublesome to step the slab form and the stop form, but
The slab rebar has a drawback that the workability is low because it takes time to bend and fix the slab rebar both inside and outside the step.

In addition to the above, in addition to the increase in the number of members of the precast concrete panel 2 and the labor required for processing, the installation work of the supporting work becomes complicated, so that the workability is low.

Further, in the above and the above, there is a drawback that the internal plan or the like is easily restricted because the ceiling or ceiling pocket on the lower floor is partially formed.

In the above and the above, not only the workability is low because the concrete is cast twice, but the weight of the floor slab 1 is considerably increased by the amount of the additional concrete C that is cast even if the lightweight concrete is used. Therefore, there is a disadvantage that there are many disadvantages and disadvantages structurally.

Furthermore, the above-mentioned and additional concrete C
There is also a structure in which the height of the upper surface is adjusted by assembling a floor made of a synthetic resin material or wood instead of, but it has a drawback that the labor and material cost of the work increase.

[0013]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a floor slab upper surface step structure in which the floor slab upper surface can be partially lowered without impairing the workability and structural performance of the floor slab.

[0014]

The above objects of the present invention are as follows. In the floor slab structure in which the upper surface of the floor slab is made higher by increasing the slab thickness by providing a hollow portion inside the entire surface of the reinforced concrete floor slab without the girders surrounded by the large beam and / or the bearing wall of the building, A floor slab upper surface step structure, characterized in that a step is formed on the floor slab upper surface by partially omitting the hollow portion of the slab and reducing the slab thickness to partially lower the upper surface of the floor slab,

2. At the boundary between the floor slab having the hollow portion and the floor slab omitting the hollow portion, a border portion having the same thickness as the floor slab having the hollow portion and omitting the hollow portion is provided, and in the border portion, the hollow portion A floor slab upper surface step structure according to the above item 1, characterized in that the floor slab has an upper rebar and an upper rebar of the floor slab in which the hollow portion is omitted.

3. The floor slab upper surface step structure according to 1 or 2, wherein the hollow portion is made of a lightweight material such as foamed resin.

4. The floor slab upper surface step structure according to any one of 1 to 3, wherein the lower portion of the floor slab has a lower surface, which is a portion in contact with a corner of the entire floor slab.

5. The floor slab upper surface step structure according to any one of the above 1 to 3, wherein the lower portion of the floor slab has a lower surface in contact with one side of the entire floor slab.

6. The floor slab upper surface step structure according to any one of the above 1 to 3, wherein the lower part of the floor slab has a substantially central portion in the entire surface of the floor slab.

7. The floor slab upper surface step structure according to any one of 1 to 6 above, wherein a lower portion of the floor slab is configured using a precast concrete panel,

8. Any of the above 1 to 7, characterized in that a hollow portion thinner than the hollow portion is formed in a portion where the upper surface of the floor slab is partially lowered by omitting the hollow portion to reduce the slab thickness. Each of the floor slab step structures described in 1.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an explanatory perspective view showing one embodiment of the floor slab upper surface step structure of the present invention, FIG. 2 is an explanatory perspective view showing another embodiment of the floor slab upper surface step structure of the present invention, and FIG. 3 is FIG.
4 and 5 are partial cross-sectional views showing another embodiment of the upper reinforcing bar in the border portion, and FIGS.
FIG. 8 is a plan view showing a lower portion of the floor slab, FIG. 9 is an explanatory perspective view showing another embodiment of the floor slab top step structure of the present invention, and FIGS. 10 to 13 are floor slab top step structures. It is an explanatory side view which shows a prior art example.

In FIG. 1, reference numeral 1 denotes a reinforced concrete floor slab (hereinafter simply referred to as a floor slab) which is not surrounded by girders and / or bearing walls of a building, and the bottom surface of the floor slab 1 has substantially no steps. It is formed in a plane.

According to the present invention, in the floor slab 1, in order to lower the upper surface of the floor slab 1 in the bathroom, washroom, toilet, etc., which requires an underfloor piping space, the floor other than the floor By providing the hollow portion 3 inside the slab 1, the thickness of the slab is increased without increasing the weight of the slab, so that the upper surface of the floor slab 1 other than the above-mentioned water portion is configured as a so-called hollow slab. A portion where the upper surface of the floor slab 1 is high is shown as H.

As means for forming the hollow portion 3 of the floor slab 1 in the high portion H, a slab form is installed, and when the slab rebar is laid, a form for the hollow portion is formed at a position where the hollow portion 3 is formed. (See reference numeral 6 in FIG. 3) can be installed and concrete can be poured. As the mold for the hollow part,
As long as the dimensions can be maintained until the concrete is hardened and the weight is light when pouring concrete, for example, a box body made of foam resin, a box body made of synthetic resin with an empty inside, a paper box body such as cardboard, or a thin iron plate Examples of the can include a can-shaped tubular body made of a resin, and a rectangular body made of a foamed resin such as ethlen void is preferable.

The floor slab 1 around the water is
By omitting the hollow portion 3, the thickness of the slab is reduced to form a so-called general slab in which the upper surface of the floor slab 1 around the water is lowered. A portion where the upper surface of the floor slab 1 is low is shown as L.

In FIG. 1, D is a stepped portion formed by a high portion H and a low portion L.

At the boundary between the high portion H which is the floor slab 1 having the hollow portion 3 and the low portion L which is the floor slab 1 in which the hollow portion 3 is omitted, the same thickness as that of the floor slab 1 of the high portion H is provided. In addition, a strip-shaped border portion B having a width of about 50 cm or less is provided without the hollow portion 3. The border portion B has a function of smoothing the flow of force from the high portion H to the low portion L or from the low portion L to the high portion H, so that two kinds of slabs (high portion H and a low portion L) are formed as one type (one sheet) of slab in terms of structural mechanics. Therefore, one point (for cantilever)
Alternatively, it has two (in the case of a normal beam) support points and has a function different from that of a beam that applies a force to the support points.

Further, in order to secure continuity between the upper reinforcing bar 4H of the floor slab 1 in the high part H and the upper reinforcing bar 4L of the floor slab 1 in the low part L to prevent the strength of the reinforcing bar from decreasing, Bundling upper rebar 4H and upper rebar 4L
Continuously arrange the joints by means such as binding and welding.
In FIG. 1, 5 is a lower reinforcing bar.

The continuous bar arrangement of the upper reinforcing bar 4H and the upper reinforcing bar 4L in the border portion B is not limited to the above as long as it can continuously maintain the strength and maintain the strength. Besides, various means can be adopted.

In FIG. 4, the border part B is regarded as a reinforced concrete beam, and the upper reinforcing bar 4H and the upper reinforcing bar 4L are continuously formed through the ribs 7, and the upper end bars 8 and the lower ends are formed in the ribs 7. By arranging the reinforcement 9 and the reinforcement 9, the upper reinforcement 4H and the upper reinforcement 4
This is a configuration in which L and L are continuously arranged.

FIG. 5 shows a structure in which the upper reinforcing bar 4H and the upper reinforcing bar 4L are formed as a single piece, and are bent to match the step portion D in the border portion B. In the case of this configuration, it is necessary to take measures to prevent the bent portion from getting caught in the direction of the step portion D.

The floor slab 1 shown in FIG. 1 described above is constructed, for example, by the following procedure. First, assemble a flat slab formwork. Arrange the lower reinforcing bar 5. A hollow part mold 6 is installed at the position where the hollow part 3 is formed. Arrange the upper reinforcing bars 4H and 4L. Assembling the step stop mold at the step D forming position. Place concrete. After the concrete has hardened, the step form and slab form are removed to complete the work.

Next, another embodiment of the present invention will be described with reference to FIGS. The floor slab 1 shown in FIG. 2 is an embodiment in which the lower part of the floor slab 1 is constituted by a precast concrete panel 2, and the precast concrete panel 2 can be used in place of the slab formwork, so that the slab formwork assembly and Since the removal of the slab formwork after completion of the floor slab 1 can be omitted, the workability is improved. The formwork 6 for the hollow portion is attached to a predetermined position above the precast concrete panel 2 as shown in FIG. It is preferable that the hollow frame 6 be attached in advance before the precast concrete panel 2 is erected.

Next, the application position of the present invention will be described with reference to FIGS. 6 to 8, T indicates a girder and / or a bearing wall of a building.

FIG. 6 shows a portion L where the upper surface of the floor slab 1 is low.
Shows a mode in which it is formed in a portion of the entire surface of the floor slab 1 that is in contact with a corner portion.

FIG. 7 shows a portion L where the upper surface of the floor slab 1 is low.
Shows a mode in which it is formed on a portion of the entire surface of the floor slab 1 that is in contact with one side of the periphery. In addition, in FIG. 7, an imaginary line 10 shows a joint in the case of using the precast concrete panel 2, and as shown in the figure, the step portion D can be formed regardless of the position of the joint 10. However, one side or a plurality of sides of the step portion D may be aligned with the position of the seam 10 (the same applies to FIGS. 6 and 8).

FIG. 8 shows a portion L where the upper surface of the floor slab 1 is low.
Shows an aspect in which the floor slab 1 is formed in a substantially central portion of the entire surface.

In the embodiment of the present invention shown in FIGS. 1 to 8 described above, the hollow portion 3 is not formed at all to reduce the slab thickness to form the lower portion L of the floor slab 1. When there is a demand to increase the thickness of the entire floor slab 1 including the lower portion L of the slab 1, as shown in FIG. 9, a hollow portion thinner in the lower portion L than the hollow portion 3 in the higher portion H. The part 3'can be formed. By providing the hollow portion 3'in the low portion L thinly with respect to the hollow portion 3 in the high portion H, the low portion L can be formed.

[0040]

According to the present invention, the hollow slab is provided inside the floor slab other than the water supply part of the bathroom, washroom, toilet, etc., which requires an underfloor piping space, without increasing the slab weight. Since the upper surface of the floor slab is increased by increasing the thickness and the floor slab of the water part has a configuration in which the hollow part is omitted to reduce the slab thickness and the upper surface of the floor slab of the water part is lowered. The following effects are achieved. Therefore, it is possible to provide a floor slab upper surface step structure in which the floor slab upper surface can be partially lowered without impairing the workability and structural performance of the floor slab.

Since it is not necessary to form a step on the lower surface of the floor slab, not only is it troublesome to make a step on the slab formwork and to bend the lower reinforcing bar at the step, but also a partition or a ceiling on the lower floor. The workability such as is not impaired.

Further, even when the lower part of the floor slab is made of a precast concrete panel, the labor of the step on the lower surface is not required, so that the workability is improved.

Furthermore, not only is concrete pouring done once, but there is no structural disadvantage or inconvenience because the problem of increased weight when pouring additional concrete is eliminated.

Furthermore, since most of the floor slab 1 is constructed as a hollow slab, it is possible to secure a slab with a large area without beam beams.

Further, as an additional effect, since a hollow slab having a high sound insulation performance is provided in a part other than the water supply part, that is, a part which becomes a living room or a corridor, a comfortable living environment can be obtained.

Particularly, when the hollow portion is made of a lightweight material such as foamed resin as described in claim 3, there is an advantage that the construction becomes easy.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view showing an embodiment of a floor slab upper surface step structure of the present invention.

FIG. 2 is an explanatory perspective view showing another embodiment of the floor slab upper surface step structure of the present invention.

FIG. 3 is an explanatory perspective view showing the construction process of FIG. 2;

FIG. 4 is a partial cross-sectional view showing another embodiment of the upper reinforcing bar in the border portion.

FIG. 5 is a partial cross-sectional view showing another embodiment of the upper reinforcing bar in the border portion.

FIG. 6 is a plan view showing a portion where the upper surface of the floor slab is lowered.

FIG. 7 is a plan view showing a portion where the upper surface of the floor slab is lowered.

FIG. 8 is a plan view showing a portion where the upper surface of the floor slab is lowered.

FIG. 9 is an explanatory perspective view showing another embodiment of the floor slab upper surface step structure of the present invention.

FIG. 10 is an explanatory side view showing a conventional example of a floor slab upper surface step structure.

FIG. 11 is an explanatory side view showing a conventional example of a floor slab upper surface step structure.

FIG. 12 is an explanatory side view showing a conventional example of a floor slab upper surface step structure.

FIG. 13 is an explanatory side view showing a conventional example of a floor slab upper surface step structure.

[Explanation of symbols]

 1 Floor Slab 2 Precast Concrete Panel 3 Hollow Part 4H Upper Reinforcing Bar 4L Upper Reinforcing Bar 5 Lower Reinforcing Bar 6 Hollow Form 7 Rib 8 Upper End 9 Lower End 10 Seam B Border C Increased Concrete D Step D D Floor Slab Lower surface step H Higher part of floor slab Upper part L Lower part of floor slab T Large beam and / or bearing wall of building

Claims (8)

[Claims] 1. A floor slab in which the upper surface of the floor slab is made higher by increasing the slab thickness by providing a hollow portion inside the entire surface of a reinforced concrete floor slab without a girder surrounded by large beams and / or bearing walls of a building. In the structure, the hollow portion of the floor slab is partially omitted to reduce the thickness of the slab, thereby partially lowering the upper surface of the floor slab and forming a step on the upper surface of the floor slab. Top step structure. 2. A border part having the same thickness as the floor slab having the hollow part and having the hollow part omitted is provided at a boundary part between the floor slab having the hollow part and the floor slab having the hollow part omitted,
The floor slab upper surface step according to claim 1, wherein in the border portion, an upper reinforcing bar of a floor slab having a hollow portion and an upper reinforcing bar of a floor slab having a hollow portion are continuously arranged. Construction. 3. The floor slab upper surface step structure according to claim 1, wherein the hollow portion is made of a lightweight material such as foamed resin. 4. The upper surface of the floor slab according to claim 1, wherein the lower surface of the floor slab is a portion of the entire surface of the floor slab which is in contact with a corner portion. Step structure. 5. The floor slab upper surface according to claim 1, wherein the lower portion of the floor slab is a portion of the entire surface of the floor slab which is in contact with one side of the periphery. Step structure. 6. The floor slab upper surface step structure according to claim 1, wherein the lower portion of the floor slab is a substantially central portion of the entire surface of the floor slab. 7. The floor slab upper surface step structure according to claim 1, wherein a lower portion of the floor slab is configured by using a precast concrete panel. 8. A hollow portion thinner than the hollow portion is formed in a portion where the upper surface of the floor slab is partially lowered by omitting the hollow portion and reducing the slab thickness. The floor slab step structure according to any one of 1 to 7.