JPH0626143A - Hollow slab - Google Patents

Abstract

(57) [Abstract] [Purpose] The truss bodies are interposed between the slabs by using the vertical reinforcing bars of the slabs at the top and bottom ends, and the weight of the slab is reduced by reducing the concrete used, and the process is also simplified. [Structure] Vertical trusses for upper and lower slabs are upper chord members and lower chord members, and a plurality of truss bodies with diagonal members are installed between the upper and lower slabs at regular intervals in the lateral direction. Then, the upper part of the truss body is embedded in the upper end slab concrete and the lower part thereof is embedded in the lower end slab concrete, respectively, to be integrated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hollow slab.

[0002]

2. Description of the Related Art In general, hollow slabs are widely used in warehouse construction and the like because they can have a large span and a beam type does not project to the ceiling surface and a smooth space can be formed on the ceiling surface. And, while using the precast concrete plate for both the upper slab and the lower slab, and using the steel truss composed of the upper and lower chord members and the diagonal member of the tubular body, the upper and lower chord members of the steel truss and the upper and lower precast concrete plates. It is known to construct a double slab by joining and with cast-in-place concrete. (JP-A-54-7721)

[0003]

According to this method, the cast-in-place concrete is applied for joining the steel truss and the upper and lower precast concrete plates even though the corner precast concrete plates are used. The construction is not very simplified.

The present invention has been proposed in order to simplify the process of the hollow slab as a whole, and has a larger span and a lighter weight than the conventional hollow slab, and the number of floors can be increased as much as possible. It is an object of the present invention to provide a hollow slab that can be made and can have a ceiling height as high as possible.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an upper slab,
Vertical bars of each lower slab, upper chord member, lower chord member and a plurality of truss bodies with diagonal members provided between the reinforcing bars are installed laterally at regular intervals between the upper slab and the lower slab,
The upper part of the truss body is embedded in the upper slab concrete, and the lower part of the truss body is embedded in the lower slab concrete.

According to the present invention, the vertical rebars arranged in the upper slab and the lower slab are used as the upper chord member and the lower chord member, respectively, and a truss body composed of the diagonal member is used to form a hollow slab. In addition to simplifying the process as a whole, it has a larger span than the conventional hollow slab,
(EN) Provided is a hollow slab which can be reduced in weight, can increase the number of floors as much as possible, and can also make the ceiling height as high as possible.

[0007]

The present invention will be described below based on illustrated embodiments.

1 and 2 are vertical sectional views showing a hollow slab of the present invention. The hollow slab 1 of FIG.
The vertical reinforcing bars 5 arranged on the lower end slab 2 are upper chord members, lower chord members, and angle members, etc. are used as the diagonal members 4, and truss bodies are used to place cast-in-place concrete.
The upper slab 3 and the lower slab 2 are formed. At this time, a truss body is embedded at a predetermined place in the concrete of the upper and lower slabs 3 and 2, and the whole is integrally constructed.

The lower end slab 2 is used as a precast concrete plate, a truss body is assembled using the vertical reinforcing bar 5 of the lower end slab 2 as a lower chord member at the time of manufacture, and the lower part of the truss body is embedded in the precast concrete plate. If only the upper slab 3 is made of concrete, the workability at the site is further improved.

The formation and embedding intervals of the truss body are determined by the span of the hollow slab 1. Generally, as the span increases, the composition increases and the embedding interval decreases.

According to the designed embedding interval, the truss body is constructed by using the vertical reinforcing bars of the corresponding portions as chord members.

The hollow slab 1 shown in FIG. 2 uses a truss body in which the vertical reinforcing bars arranged in the upper slab 3 and the lower slab 2 are the upper chord member and the lower chord member, respectively, and the reinforcing bar is the diagonal member 4. Casting concrete to form the upper slab 3 and the lower slab 2, and at this time, the truss body is embedded in the concrete of the upper and lower slabs 3 and 2 at predetermined places, and the whole is integrated and constructed. Is.

[0013]

Since the hollow slab of the present invention has the above constitution, it has the following effects.

1. Since the truss body is interposed between the slabs at the upper and lower ends, the weight of the slab can be significantly reduced by reducing the concrete used.

2. Since the vertical reinforcing bars of the slabs at the upper and lower ends are used as a part of the truss body, the whole process is simplified.

3. Since the hollow portion is formed not only in the vertical direction but also in the horizontal direction, various pipes and wirings are easy.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a hollow slab of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the hollow slab of the present invention.

[Explanation of symbols] 1 ... Hollow slab, 2 ... Lower end slab, 3 ... Upper slab, 4 ... Slanting material, 5 ... Vertical rebar

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Naoki Niwa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A plurality of truss bodies in which vertical reinforcing bars of the upper slab and the lower slab are upper chord members and lower chord members, respectively, and diagonal members are provided between the reinforcing bars, and the plurality of truss bodies are laterally spaced at a constant interval between the upper slab and the lower slab. The hollow slab is characterized in that the upper part of the truss body is embedded in the upper slab concrete and the lower part thereof is embedded in the lower slab concrete, respectively.