JPH0932177A - Slab structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily lay pipes and wirings at low cost without spoiling a beautiful appearance. SOLUTION: A precast slab 11 on which a recess 17 opened upward is formed, is supported by beams and pipes H and wirings are laid in the recess 17 and plates 19 are installed on the steps 18 formed at the opening of the recess 17. Concrete K is placed on the upperface side of the precast slab 11 in the state the main reinforcements 13 protruded upward to the upper part of the precast slab 11 and mesh rods 15a are embedded and the concrete is cured and solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab structure that constitutes a building, and more particularly to a slab structure using a precast slab.

[0002]

2. Description of the Related Art Conventionally, for example, reinforced concrete,
When constructing a floor of a building made of steel-framed concrete or reinforced steel-framed concrete, the formwork material and various types of steel bars arranged in the floor were supported by supporting works, and the concrete was cast in situ to be cured and cured. However, in the case where concrete is cast on site to construct a floor in this way, a great deal of labor is required for positioning and supporting the formwork material by supporting work and concrete placing work. As shown in, a precast slab 2 on which the reinforcing bars 1 are arranged is produced in advance in a factory, the precast slab 2 is supported by a beam of a building, and concrete K is cast on the upper surface side in situ. According to this, a construction method for constructing a floor Y in which the precast slab 2 and the cast-in-place concrete K are integrated is performed.

[0003]

By the way, when the pipe is arranged along the floor Y, the pipe is embedded in the floor Y. However, when the precast slab 2 is used, the pipe is thick. Therefore, there is a problem in that the strength of the cast-in-place concrete K portion is reduced. Further, it has been attempted to improve the strength by forming ribs on the lower surface side of the precast slab 2 and introducing prestress to the PC steel material in the ribs. There is a problem that it is necessary to use a steel material, and the rib protruding to the lower surface side impairs the appearance.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a slab structure in which the strength can be secured without impairing the aesthetic appearance and the piping and wiring can be arranged extremely easily. There is.

[0005]

In order to achieve the above object, a slab structure according to a first aspect of the present invention is a precast slab formed by previously embedding a reinforcing bar, and the reinforcing bar projecting to the upper surface side of the precast slab. A slab structure consisting of concrete cast to embed a part of the precast slab, the precast slab is formed in a concave cross-sectional view with the upper side opened, in the opening of this concave portion, It is characterized in that a closing plate is provided and a space defined by the concave portion and the closing plate is an installation space in which various pipes and wirings can be provided. A slab structure according to a second aspect is the slab structure according to the first aspect, wherein the space portion has a piping function. A slab structure according to a third aspect is the slab structure according to the first or second aspect, wherein the closing plate is formed in an uneven shape in the longitudinal direction. A slab structure according to a fourth aspect is the slab structure according to any one of the first to third aspects, in which a groove portion is formed in a longitudinal direction on a side surface of the precast slab, and at an upper side of the groove portion. A gap is formed between the adjacent side faces of other precast slabs, and the concrete is filled in the gap and the groove.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the slab structure of the present invention will be described below with reference to the drawings. 1 and 2,
Reference numeral 11 is a precast slab. The precast slab 11 is formed in a concave shape in cross section with an opening on the upper side, and is formed in advance in a factory. In the side plate portion 12 that constitutes this precast slab 11,
Each main bar 13 is arranged. These main lines 13
Has an upper end main bar 13a and a lower end main bar 13b arranged in parallel with each other. The upper end main bar 13a and the lower end main bar 13b are arranged in a spiral shape on the outer peripheral side of the main bar 13 and are fixed to each other. It is integrated by the reinforcing bar 14.

The main bars 13 have mesh bars (welded wire mesh, etc.) 15a and 15b at their upper and lower portions, respectively.
And the mesh muscles 15 arranged on the lower side.
b is embedded in the bottom plate portion 16 that constitutes the precast slab 11. Steps 18 are formed in the vicinity of the openings of the recesses 17 formed in the precast slab 11 along the longitudinal direction, and these stepped portions 18 have an uneven shape in the longitudinal direction of the precast slab 11. The formed plate 19 is laid over, and this plate 1
A space portion 21 formed by the recessed portion 17 of the precast slab 11 divided by spanning 9 is used as an arrangement space, and various pipes / wirings H are arranged. Then, concrete K is cast on the upper part of the precast slab 11 around which the plate 19 is bridged, and the upper end main bar 13a and the mesh bar 15a protruding to the upper surface side are embedded in the concrete K. Also,
Grooves 22 are formed on the side faces of the precast slab 11 in the longitudinal direction, and when the side faces are abutted with each other, a gap 23 is formed on the upper side of the groove 22. Then, when the concrete K is cast on the upper surface side of the precast slab 11, the concrete K enters into the groove portion 22 through the gap 23, so that the precast slab 11 and the concrete K are reliably integrated. ing.

When the floor Y of a building is constructed using the precast slab 11 having the above structure, first, the beam of the building is used to support the precast slab 11 with its recess 17 facing upward. Then, various pipes / wirings H are arranged in the recess 17 of the precast slab 11, and the plate 19 is hung over the step 18 formed near the opening of the recess 17 to close the recess 17. . Then, concrete K is cast on the upper surface side of the precast slab 11 so as to embed the projecting main reinforcement 13a and mesh reinforcement 15a, and is cured and cured.

Thus, the above precast slab 1
According to 1, the pipe / wiring H is arranged very easily by disposing the pipe / wiring H in the recess 17 of the precast slab 11 and closing it by the plate 19 and placing concrete K on the upper portion. It is possible to construct a raised floor Y.
Further, since the side plate portion 12 on which the main bar 13 is arranged ensures a certain strength, it is possible to ensure a sufficient strength even if the lower surface is smoothed. Good aesthetics can be ensured as compared with the case where ribs are provided. In the example of the above embodiment,
Space 2 defined by the recess 17 and the plate 19
Although the pipes / wirings H are arranged inside the space 1, it is also possible to use the space 21 itself as a pipe for air conditioning, for example, without disposing the wirings / pipes H as shown in FIG. Therefore, it is possible to save the trouble of arranging the piping.

[0010]

As described above, according to the slab structure of the present invention, the following effects can be obtained. According to the slab structure of claim 1, the pipe / wiring is arranged in the concave portion of the precast slab, the opening thereof is closed by the closing plate, and the concrete is placed on the upper portion of the precast slab. -A floor with wiring can be constructed. In other words, the lower surface can be made smooth while ensuring sufficient strength, and a floor with excellent appearance can be constructed at low cost. According to the slab structure of the second aspect, the space portion partitioned by the concave portion and the closing plate is used as a pipe for air conditioning, for example, so that the labor for arranging the pipe can be omitted. According to the slab structure of claim 3, since the closing plate is formed in a concavo-convex shape in the longitudinal direction, the bending strength of the closing plate can be significantly improved, and the load of concrete to be placed on the upper part. Can be reliably received. According to the slab structure of claim 4, a plurality of precast slabs,
Just by placing the concrete by contacting and supporting the side faces, from the gap formed between the side faces of the precast slab, fill the groove portion formed on the side face along the longitudinal direction with concrete, It is possible to surely integrate the concrete and the precast slab.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cross section of a part of a floor for explaining a slab structure according to an embodiment of the present invention.

FIG. 2 is a sectional view of a floor explaining a slab structure according to an embodiment of the present invention.

FIG. 3 is a perspective view in which a part of the floor is viewed in section for explaining the slab structure according to the embodiment of the present invention.

FIG. 4 is a perspective view of a part of a floor for explaining a conventional example of a slab structure using a precast slab.

[Explanation of symbols]

 11 Precast Slabs 13 Main Bars (Reinforcing Bars) 14 Shear Reinforcing Bars (Reinforcing Bars) 15a, 15b Mesh Reinforcing Bars (Reinforcing Bars) 17 Recesses (Concave Sections) 19 Plates (Closing Plates) 21 Spaces H Piping / Wiring K Concrete

Front page continuation (72) Yuzo Ichijo Yuzo Ichijo 2--10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Co., Ltd. (72) Inventor Shinji Kato 2--10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Kogyo Co., Ltd. (72) Inventor Hiroshi Hirota 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (4)

[Claims] 1. A slab structure composed of a precast slab formed by previously embedding reinforcing bars and concrete cast so as to embed a part of the reinforcing bars projecting to the upper surface side of the precast slab. Wherein, the precast slab is formed in a concave cross-sectional view of the upper side is opened, the opening of the concave portion, a closing plate is disposed, the space portion defined by these concave portion and the closing plate, A slab structure characterized by being an installation space where various pipes and wiring can be installed. 2. The slab structure according to claim 1, wherein the space portion has a piping function. 3. The slab structure according to claim 1, wherein the closing plate is formed in an uneven shape in the longitudinal direction. 4. A groove is formed on the side surface of the precast slab in the longitudinal direction, and a gap is formed between the side surface of another adjacent precast slab on the upper side of the groove. The slab structure according to any one of claims 1 to 3, wherein the concrete is filled in the gap and the groove.