JPH01226961A - Hollow slab - Google Patents

Abstract

PURPOSE:To obtain a hollow slab with reduced floor thickness and increased strength by providing unbound prestressed concrete wires in solid members between hollow members that are installed at the fixed intervals. CONSTITUTION:Unbound prestressed concrete wires 9 are provided in solid members laid between hollow members 6 that are installed at the fixed intervals. A hollow slab 4 structured in such a way can be made with smaller thickness as it will have increased strength with reinforcement by the prestressed concrete wires 9. As a ceiling board can be fixed right below the hollow slab 4 with the inside equipment of the ceiling contained in the hollow members 6 by a reinforcement effect of the prestressed concrete wires 9, story height of the building can be reduced and reduction of construction costs can te realized as well.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to hollow slabs.

[Prior Art and Problems to be Solved by the Invention] As a conventional hollow slab, the one shown in FIG. 8 is generally known. This makes it possible to reduce the weight in the hollow part 1 and increase the floor thickness H. Therefore, there is no need to provide intermediate beams, etc., and a strong, large-span slab can be obtained.

On the other hand, in a typical slab as shown in Fig. 9, in-ceiling equipment such as air conditioning ducts 2 and electrical wiring 3 for lighting etc. are installed separately below the slab, and there are beams. It was necessary to enlarge the space within the ceiling. As a result, the building had a large floor height, and the construction cost of the entire building was high.

This floor height is thicker (this is also the case with the conventional hollow slabs mentioned above because the floor thickness is increased to make it stronger).

This invention was devised in view of the above-mentioned circumstances, and its purpose is to create a strong hollow slab that allows ceiling equipment to be housed in the hollow space without increasing the floor thickness, thereby reducing the floor height. Our goal is to provide the following.

[Means to solve the problem]

According to this invention, unbonded PC steel wires are disposed in the solid portions between the hollow portions provided at predetermined intervals. After concrete is poured, it is strengthened by applying prestress using unbonded PC steel wire.

〔Example〕

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows a first embodiment, in which a hollow slab 4 has a plurality of PCvi 5 on its lower end surface, and a plurality of rectangular hollow portions 6 at predetermined intervals on the upper surface of each PC board 5. Concrete 7 is placed so that it can be formed. In addition, in the solid part 8 between each hollow part 6, there is an unbonded PC.
A steel wire 9 is provided.

When manufacturing this hollow slab 4, first, a PCC 5 with a formwork 10 for forming the hollow part set in advance at the factory.
0. Deliver the slab to the construction site and lay it out. (Second
(See figure) Next, unbond PC steel wire 9 is inserted between each formwork 10, and PCC
The PCC plates are set in a suspended manner by means of supporting metal fittings 11 fixed on the plate, and joint reinforcements 12 connecting each PCC plate to another, upper end reinforcements 13 of the slab, etc. are arranged. (See Figure 3) After that, concrete is poured to complete the hollow slab 4 integrated with the PCC 50 which also serves as a formwork. (
(See Figure 1) Figures 4 and 5 show an embodiment in which ceiling equipment such as an air conditioning duct 14 and electrical wiring 15 for lighting etc. are housed in the hollow part 6 of the hollow slab 4. . Here, 16 is a foam, which serves as a formwork for forming hollow parts 6 other than the hollow parts 6 for air conditioning duct 14 and electric wiring 15.

In this way, the ceiling plate 17 can be attached directly below the slab.

In addition, FIGS. 6 and 7 show the hollow portion 6 in a formwork 1 of a different form.
8 shows the hollow slab 4 formed in step 8.

The formwork 18 in this case is made by putting together a plurality of air tubes 19, injecting air, and molding them with cloth or the like so that the concrete can easily wrap around the lower part of the formwork, such that the lower ends are aligned.

Then, concrete is poured in one step to manufacture the hollow slab 6.

(Effects of the Invention) The present invention has the above configuration and has the following effects.

By arranging unbonded PC steel wires in the solid parts between the hollow parts provided at predetermined intervals to form a hollow slab, the floor thickness can be reduced because it is reinforced with the PC steel wires and its strength is increased. Can be done.

Furthermore, due to the reinforcing effect of the PC steel wire, all ceiling equipment can be housed within the hollow space, and the ceiling board can be installed directly below the hollow slab.

As a result, the floor height of each hollow slab in the building can be reduced, and the cost of the entire building can be reduced.

Furthermore, the reinforcement effect of PCM wires makes it possible to provide large span slabs without columns.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing a hollow slab of the present invention;
Figures 3 and 3 are partial cross-sectional views showing the manufacturing process, Figure 4 is a partial cross-sectional view showing ceiling equipment stored in the hollow part of a hollow slab, and Figure 5 is a cross-sectional view taken along line A-A in Figure 4. Figures 6 and 7 are partial sectional views showing a hollow slab with a different hollow part, Figure 8 is a partial sectional view showing a conventional hollow slab, and Figure 9 is a floor slab of a general building. FIG. 3 is a partial cross-sectional view showing the vicinity. DESCRIPTION OF SYMBOLS 1...Hollow part, 2...Air conditioning duct, 3...Electric wiring, 4...Hollow slab, 5...PC board, 6...
Hollow part, 7... Concrete, 8... Solid part, 9.
...Unbonded PC steel wire, 10...Formwork, 11...
Supporting metal fittings, 12...Joint reinforcement, 13...Upper end reinforcement, 14...Air conditioning duct, 15...Electrical wiring, 16
... Foam, 17... Ceiling board, 18... Formwork, 1
9...Air tube.

Claims (1)

[Claims] A hollow slab characterized in that unbonded PC steel wires are arranged in solid parts between hollow parts provided at predetermined intervals.