JP3089181B2 - Floor slab upper surface step structure - Google Patents

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 lower portion is formed by providing a step on an upper surface of a floor slab, and a lower surface of the floor slab is flat without a step.

[0002]

BACKGROUND OF THE INVENTION Not only in individual residences, but also in apartments and hotels, it is an extremely important element to obtain a comfortable living environment by adjusting the height of the finished floor to the same plane.

In order to make the height of the floor finished surface uniform, a step is provided on the upper surface of a floor slab such as a bathroom, a lavatory, a toilet, etc., which requires piping space under the floor, that is, the floor slab in the water area is lowered. The formation is performed, and specifically, the following structure is adopted.

As shown in FIG. 10, a step D 'is formed on a slab form (not shown) for forming the lower surface of the floor slab 1, and the step D is formed on the upper surface of the floor slab 1 by a stop form (not shown).
Attaching concrete and casting concrete. In this case, the thickness of the floor slab is constant at both the high portion and the low portion of the upper surface of the floor slab.

As shown in FIG. 11, a precast concrete panel 2 is used in place of the above-mentioned slab formwork, the precast concrete panel 2 is divided and laid with steps, and the upper surface of the floor slab 1 is a stop formwork. A structure in which concrete is cast after a step D is formed by a not shown (not shown). Also in this case, the thickness of the floor slab is constant at the high portion H and the low portion L on the upper surface of the floor slab 1 as described above.

As shown in FIG. 12, instead of lowering the upper surface of the floor slab 1 in the water circulating portion L, the upper surface of the floor slab 1 in the other portion H is increased and the height is increased by casting concrete C. In this case, the thickness of the high portion H on the upper surface of the floor slab 1 is larger than that of the low 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. Also in this case, as in the above case, the thickness of the high portion H on the upper surface of the floor slab 1 is increased, and the thickness of the high portion H is larger than that of the low portion K because the concrete C is cast.

[0008]

In the above, not only is it time-consuming to step the slab form and the stop form, but also,
The slab reinforcing bar has a drawback that the workability is low because it takes time and effort to bend and fix the step inside the step.

[0009] In addition to the above, in addition to the increase in the number of members of the precast concrete panel 2 and the processing time, the installation work of the shoring work is complicated, so that the workability is low.

[0010] Furthermore, the above method has a drawback that a lower part is formed in the ceiling or ceiling of the lower floor, so that the internal plan and the like are easily restricted.

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

Further, the above and the above concrete C
Alternatively, there is a structure in which the upper surface height is adjusted by assembling a floor made of a synthetic resin material or wood, but has a drawback that the labor and material cost of construction increase.

[0013]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a floor slab upper surface step structure capable of partially lowering the floor slab upper surface without impairing the workability and structural performance of the floor slab.

[0014]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows: 1. To increase the slab thickness by providing a hollow portion inside a reinforced concrete floor slab without girders and / or small beams surrounded by load-bearing walls of a building. The floor slab is provided with a portion where the upper surface of the floor slab is raised and a portion where the upper surface of the floor slab is partially reduced by partially omitting the provision of the hollow portion and reducing the slab thickness. in floor slab structure which forms a plane which is stepped difference on the upper surface, the boundary between the floor slab portion and the hollow portion omitted floor slab portions having a hollow portion, with the same thickness and the floor slab portion having a hollow portion And a border portion in which a hollow portion is omitted is provided, and in the border portion, upper reinforcing bars of a floor slab portion having a hollow portion and upper reinforcing bars of a floor slab portion in which a hollow portion is omitted are continuously arranged. You Floor slab upper surface step structure,

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

3. The floor slab upper surface step structure according to the above item 1 or 2, wherein the lower portion of the upper surface of the floor slab is a portion in contact with a corner of the entire surface of the floor slab.

4. The floor slab upper surface step structure according to 1 or 2, wherein the lower portion of the upper surface 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.

5. The floor slab upper surface step structure according to the above item 1 or 2, wherein the lower portion of the upper surface of the floor slab is a substantially central portion of the entire surface of the floor slab.

6. The floor slab upper surface step structure according to any one of 1 to 5, wherein a lower portion of the floor slab is constituted by using a precast concrete panel.

7. 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 reducing the slab thickness by omitting the hollow portion. 7. The floor slab upper surface stepped structure according to any one of items 6 to 6,

[0021]

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory perspective view showing an 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.
FIGS. 4 and 5 are partial cross-sectional views showing another embodiment of the upper reinforcing bar in the border portion, and FIGS.
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, and FIGS. It is explanatory side view which shows a prior art example.

In FIG. 1, reference numeral 1 denotes a reinforced concrete floor slab having no girders surrounded by girders and / or load-bearing walls of a building (hereinafter simply referred to as floor slab), and the lower surface of the floor slab 1 has substantially no steps. It is formed in a plane.

According to the present invention, in order to lower the upper surface of the floor slab 1 of the floor slab 1 where the plumbing space is required, such as a bathroom, a lavatory, a toilet, etc. By providing the hollow portion 3 inside the slab 1, the slab thickness is increased without increasing the weight of the slab, and the so-called hollow slab is formed in which the upper surface of the floor slab 1 other than the water circulating portion is raised. The portion where the upper surface of the floor slab 1 is high is indicated as H.

As means for forming the hollow portion 3 of the floor slab 1 of the high portion H, a slab form is installed, and when arranging the slab reinforcing bars, the form for the hollow portion is formed at a position where the hollow portion 3 is formed. (See reference numeral 6 in FIG. 3), and a method of placing concrete can be adopted. As a mold for hollow parts,
It is only necessary that the dimensions can be maintained until the concrete is hardened and the weight is light, as long as the concrete is cast. For example, a foamed resin box, an empty synthetic resin box, a paper box such as cardboard, or a thin iron plate And a rectangular body made of a foamed resin such as eslenoid.

Then, the floor slab 1 in the water-circulating portion is
The so-called general slab in which the thickness of the slab is reduced by omitting the hollow portion 3 and the upper surface of the floor slab 1 in the water surrounding portion 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 step formed by a high portion H and a low portion L.

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 omitting the hollow portion 3, has the same thickness as the floor slab 1 of the high portion H. In addition, a strip-shaped border portion B having a width of about 50 cm or less, in which the hollow portion 3 is omitted, is provided. 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 types of slabs having different thicknesses (high portion H and the lower part L) are formed as one type (one sheet) of slabs in structural mechanics. Therefore, one point (in the case of a cantilever)
Alternatively, it has two support points (in the case of a normal beam), and has a function different from that of a beam that applies force to the support points.

Further, in order to secure continuity between the upper reinforcing bar 4H of the floor slab 1 of the high portion H and the upper reinforcing bar 4L of the floor slab 1 of the low portion L to prevent the strength of the reinforcing bar from decreasing, the inside of the border portion B Bundling upper rebar 4H and upper rebar 4L
It is jointed by means such as binding and welding, and is continuously arranged.
In FIG. 1, reference numeral 5 denotes a lower reinforcing bar.

The continuous 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 is a means that can be continuously arranged to maintain the strength. In addition, various means can be adopted.

FIG. 4 shows that the border portion B is regarded as a reinforced concrete beam, the upper reinforcing bar 4H and the upper reinforcing bar 4L are continuously formed via the rib 7, and the upper reinforcing bar 8 and the lower By arranging the reinforcement 9, the upper reinforcement 4H and the upper reinforcement 4H are provided.
L is continuously arranged.

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

The above-described floor slab 1 shown in FIG. 1 is constructed, for example, by the following procedure. First, a flat slab formwork is assembled. The lower reinforcing bar 5 is arranged. The hollow part formwork 6 is installed at the position where the hollow part 3 is formed. The upper reinforcing bars 4H and 4L are arranged. Assemble the step stop formwork at the position where the step portion D is formed. Pour concrete. After the concrete is hardened, the step stopper formwork and the slab formwork are removed to complete.

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. Since the precast concrete panel 2 can be used in place of the slab formwork, the assembly of the slab formwork and Since the removal of the slab formwork after completion of the floor slab 1 can be omitted, the workability is improved. The hollow part formwork 6 is attached to a predetermined position on the precast concrete panel 2 as shown in FIG. It is preferable that the mold 6 for the hollow part is already attached before the precast concrete panel 2 is erected.

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

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

FIG. 7 shows a portion L where the upper surface of the floor slab 1 is low.
Shows an aspect formed on a portion of the entire surface of the floor slab 1 that is in contact with one side of the periphery. In FIG. 7, the imaginary line 10 indicates a joint in the case of using the precast concrete panel 2, and the step portion D can be formed regardless of the position of the joint 10 as shown in FIG. 7. However, one side or a plurality of sides of the step portion D may be made to coincide with the position of the joint 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 formed in a substantially central portion of the entire surface of the floor slab 1.

In the embodiment of the present invention shown in FIGS. 1 to 8 described above, the slab thickness is reduced by forming no hollow portion 3 to form the low portion L of the floor slab 1. When there is a request to increase the thickness of the entire floor slab 1 including the low portion L of the slab 1, the hollow portion 3 in the low portion L is thinner than the hollow portion 3 in the high portion H as shown in FIG. The part 3 'can be formed. By providing the hollow portion 3 'in the low portion L thinner than the hollow portion 3 in the high portion H, the low portion L can be formed.

[0040]

According to the present invention, a slab can be provided without increasing the weight of a slab by providing a hollow portion inside a floor slab other than a water circulating portion such as a bathroom, a lavatory, a toilet, etc., which requires a piping space under the floor. Since the upper surface of the floor slab is increased by increasing the thickness, and the floor slab of the water circulating portion has a configuration in which the slab thickness is reduced by omitting the hollow portion and the upper surface of the floor slab of the water circulating portion is reduced. The following effects are obtained. Therefore, it is possible to provide a floor slab upper surface step structure that can partially lower the floor slab upper surface 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, it is not only unnecessary to step up the slab formwork which is troublesome and to bend the lower reinforcing bar at the step, but also to partition the lower floor and the ceiling. Workability such as is not impaired.

Further, even when the lower part of the floor slab is made of a precast concrete panel, the workability of the step on the lower surface becomes unnecessary, so that the workability is improved.

Further, not only the concrete is cast only once, but also the problem of weight increase when the concrete is poured is eliminated, so that there is no structural disadvantage or disadvantage.

Furthermore, since most of the floor slab 1 is formed as a hollow slab, a large area slab can be secured without using small beams.

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

In particular, when the hollow portion is made of a lightweight material such as a foamed resin, there is an advantage that the construction is easy.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing one 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 middle of construction in FIG. 2;

FIG. 4 is a partial 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 an upper reinforcing bar in a 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]

 DESCRIPTION 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 Formwork for hollow part 7 Rib bar 8 Upper bar 9 Lower bar 10 Seam B Border part C Increasing concrete D Step part D 'Floor slab Stepped portion of lower surface H Higher portion of upper surface of floor slab L Lower portion of upper surface of floor slab T Girder and / or bearing wall of building

──────────────────────────────────────────────────続 き Continuation of the front page (72) Akira Yamaguchi, Inventor 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Inside Sato Kogyo Co., Ltd. (56) References JP-A-1-137030 (JP, A) JP-A-Hei 3-81441 (JP, A) JP-A-8-27936 (JP, A) JP-A-8-42035 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 5/43 E04B 5/02

Claims (7)

(57) [Claims] 1. A reinforced concrete floor slab having no girders surrounded by girders and / or load-bearing walls of a building, wherein a hollow portion is provided inside the slab to increase the thickness of the slab, thereby increasing the upper surface of the floor slab. forming a plane which is in the floor slab upper surface stepped difference <br/> the upper surface of the floor slab by providing a hollow portion partially omitted to reduce the slab thickness to provide a partially lowered portion In the floor slab structure to be performed, a border portion having the same thickness as the floor slab portion having the hollow portion and omitting the hollow portion is provided at a boundary between the floor slab portion having the hollow portion and the floor slab portion having the hollow portion omitted. A floor slab upper surface step structure, wherein an upper reinforcing bar of a floor slab portion having a hollow portion and an upper reinforcing bar of a floor slab portion having no hollow portion are continuously arranged in the border portion. 2. The floor slab upper surface step structure according to claim 1, wherein said hollow portion is made of a lightweight material such as a foamed resin. 3. The floor slab upper surface step structure according to claim 1, wherein the lower portion of the upper surface of the floor slab is a portion in contact with a corner of the entire floor slab. 4. The floor slab upper surface step structure according to claim 1, wherein the lower portion of the upper surface of the floor slab is a portion of the entire floor slab that is in contact with one side of the periphery. 5. The floor slab upper surface step structure according to claim 1, wherein the lower portion of the upper surface of the floor slab is a substantially central portion of the entire surface of the floor slab. 6. The floor slab upper surface step structure according to claim 1, wherein a lower portion of said floor slab is formed by using a precast concrete panel. 7. 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 upper surface step structure according to any one of 1 to 6.