JPH076258Y2 - Floor PC concrete board - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is for concrete floor boards for floors, especially for floors that are the main material to support the weight and load of the completed floor, not auxiliary materials such as buried formwork. Regarding PC concrete board.

<Conventional technology> Conventionally, it has been factory-manufactured as the main material for concrete floors.
As a PC board, it is known that a large number of through holes are made through a thick concrete board as shown in FIG.

The thin-walled PC board used for the concrete floor is only the prestressed concrete board for the buried formwork developed and manufactured by the applicant of the present invention, and there is no known example of using it as the main material of the floor.

The idea was the corrugated PC concrete plate 1 shown in Fig. 7 which was published by the present inventor in "Kyokai 59-92710" Concrete plate with a hollow part ", but at that time it was difficult to manufacture such a tall corrugated plate. It was impossible to put into practical use because there was a problem in strength because the edges of adjacent PC boards were not integrated.

<Problems to be solved by the device> This device is not a thick concrete plate as shown in FIG.
The purpose is to develop a thin-walled PC concrete board that can be used as the main material of the floor and contribute to the weight reduction of the concrete floor.

<Means for Solving Problems> The PC concrete board for floor of the present invention is a unit concrete corrugated board made of PC concrete that is sequentially laid between beams and integrated as a floor by floor concrete placed on it. , The bottom surface is flat, and the bottom surface is a wide valley part whose width is larger than the height of the corrugation and half-cracks of the same-shaped peak part that connects to the left and right of the valley part. A unit corrugated sheet body consisting of half-cracked peaks, a PC steel wire in the longitudinal direction that is fixed in the wide valley concrete to maintain the required tension, and a tunnel-shaped hollow section that covers almost the entire length of the valley concave surface. It is characterized in that it is provided with a cover plate which is formed on the site and which is formed on the site, or the cover plate is integrally formed with the corrugated plate.

<Operation> PC concrete board for floor of this invention (hereinafter referred to as PC board)
Is significantly different from the conventional concept of corrugated slate plate or corrugated vinyl chloride plate which is a unit corrugated plate, and also different from the corrugated plate of the present inventors' published invention (Fig. 7) described above, and has a wide width in the center. U
There are wide valleys on the left and right of the valley,
Rather, it is a unit corrugated sheet that should be called a channel. Since both edges are half-cracked peaks, when this PC board was laid between the beams, it became a continuous corrugated board, so a unit corrugated board was used.

The feature of the PC board of this invention is that it has one U-shaped trough and the left and right ridges, and that the trough is wide V-shaped instead of V-shaped as shown in FIG. Is a plane that is stably placed on the beam, and there is a point that the plane width is a wide valley that is larger than the height of the corrugations.

In this way, by making it a unique shape as a corrugated board, when the PC boards of this invention are laid side by side between the beams, the half-cracked crests of adjacent boards are connected and fixed by floor concrete, and bending In terms of resistance, the ratio of the cross-sectional areas of the crests and valley bottoms that are the furthest up and down from the neutral axis occupy a large portion of the total cross-sectional area, and the number of inclined sections near the neutral axis that are not very effective in bending resistance. , The cross-sectional area was reduced.

These are the unique functions of the present invention, which are not shown in FIG.

<Embodiment> FIGS. 1, 2, and 3 show cross sections of three embodiments of a PC board of the present invention. The side view is omitted because the overall length is the same cross-sectional shape,
Figures 4 and 5 show the usage of PC board 10 at the construction site.
The side of board 10 is also shown.

In the embodiment shown in FIG. 1, the length is 10 to 13 m (length corresponding to the beam interval of the building), the width is 1 m, the bottom surface width is 0.54 m, and the height is 0.2 m. A corrugated trough 11 is located in the center, and half-cracked peaks 12 are attached to the left and right of the trough 11 to form a connection with both sides.

Pre-tension in the concrete of the valley 11 (pre-tension)
In this case, the PC steel wire 13 having a number of "5" is fixed through five pieces and is prestressed.

A cover plate 14 covers the valley 11 over almost the entire length to form a tunnel-shaped hollow portion 18. The cover plate 14 shown in FIG. 1 is for installation on site, and is made by bending a rectangular thin steel plate to a middle height and passing it over the valley one by one at the site one by one without gaps. The length of the valley 11 is about the entire length because, in this embodiment, cast-in-place concrete may be allowed to enter the valley without covering the cover plate 14 at each end of 1 m.

If you spread the PC board 10 with this cover plate 14 on the floor surface between beams,
The vertical and horizontal reinforcing bars b are assembled on the whole, and cast-in-place concrete is cast to make the floor concrete C.

From the summit of each half-split mountain portion 12 of the PC board 10 to the upper slope of the valley in this example, a concavo-convex shape is formed as an uneven surface for connection with the floor concrete C which is post-cast concrete. . This is because at the time of manufacturing a PC board factory, many bars are attached to the concrete injection port of the upper mold, and at the same time when the hard concrete mixed in the lower mold from the gap is spread to every corner by vibration, or after that, the upper and lower molds By pressing and making unevenness on the concrete surface with a crosspiece, the connectivity with the post-cast concrete is improved. Similar to conventional PC boards for buried formwork, each PC steel wire 13
A large number of horizontal stripes 15 are inserted in the shape that connects the two.

The embodiment shown in FIG. 2 has a width of 1 m, a lower surface width of 0.5 m, and a height of 0.25 m, and the cover plate 14 is a drop-shaped lid, and the lateral streaks 15 are extended above the mountain portions 12 to form the gibber streaks 16.

The embodiment shown in FIG. 3 is for a built-in cover plate 14 '.
The core 17 is inserted between the upper mold and the lower mold (not shown) only in the central portion of the length of the PC plate 10 where the bending moment is large, and the cover plate 14 'is built in between the upper surface of the core 17 and the lower surface of the upper mold. Is molded, and after molding, the core 17 is extracted laterally. Make the core 17 with a lightweight material such as foamed plastic and leave it in the inside
It may be melted by heating during curing. The field-mounted cover plate 14 as shown in Figs. 1 and 2 is placed on the valley portion 11 where the built-in cover plate 14 'does not cover, to form a tunnel-shaped hollow portion.
18 is continued to the whole length of the PC board 10.

4 and 5 show the situation in which the PC board 10 of the present invention is used at a construction site, and FIG. 4 is between the large and small beam embedded molds M and M'developed by the present inventor. As shown in FIG. 5, PC boards 10 are laid out without any gaps, vertical and horizontal reinforcing bars b are assembled on the PC boards 10, and floor concrete C is cast in place. In the case of FIG.
This is an example in which not only the floor concrete C but also the embedded girders M and M ′ for girders are simultaneously cast to integrate the girders and the floor.

Although a few embodiments have been described above, the present invention can be variously changed and applied by a well-known technique of a practitioner without changing the gist thereof. The design of the troughs of PC boards, the shape of half ridges, the layout of PC steel wires, the layout of internal rebars, etc. are left to the designer in charge of implementation. The cover plate that covers the valley is generally a built-in cover plate.
Although it is integrally molded simultaneously with the PC board to make it strong enough, in the case of a field-installed cover plate, there is no effect of increasing the strength of the PC board, it simply prevents cast-in-place concrete from entering the valley. Therefore, in addition to the curved plate shown in FIG. 1 and the drop lid shape shown in FIG. 2, various shapes can be designed. For example, a cardboard that can support concrete is used as a cover plate, and is supported by a bar crossed over the valley.
Such simple things are enough.

In order to integrate the PC board and the floor concrete, the uneven surface of the PC board peak is important. When connecting only the uneven surface of the PC board as shown in Fig. 1, not only the peak but also the upper parts of both slopes of the valley are uneven. It is desirable to make a cover plate so that it is exposed. However, if the dowels 16 are formed in various shapes on the uneven surface of the PC board as shown in Fig. 2, the reliability will be improved, etc., and this will also be left to the devise of the implementing engineer.

<Effect of the Invention> This invention makes thin PC boards practical for the first time as the main material of the concrete floor of the structure.

The PC board of this invention has a flat bottom with a wide valley and is stably placed on the beam. Therefore, unlike the corrugated sheet 1 shown in FIG. , The halves of both edges are securely connected to the adjacent PC board by the concrete floor.

Therefore, if you look at the single PC board of this invention, it is a groove shape, but if you spread it between the beams, it will become a continuous corrugation, and by placing concrete on the floor, a large corrugated board Unify.

Since the troughs of each PC board are covered with a cover board, concrete on the floor does not enter and the corrugated board keeps the floor lightweight. Since the cover plate is in between, the contact surface between each PC plate and the floor concrete is only near the top of the mountain, but since it is an uneven surface and the connectivity is sufficient in advance, the whole can be reliably integrated. .

Making a pre-tensioned PC board is generally troublesome, but the one of this invention is maximally simplified as a unit corrugated board,
Suitable for mass production, easy to transport and handle.

This invention provides the thinnest PC board, which is the finest and lightest and toughest concrete product, as a unit component material of corrugated board that is rich in bending resistance in terms of shape. It is designed to be obtained, and the effect of reducing the weight of the floor and simplifying the work is great.

[Brief description of drawings]

FIGS. 1, 2, and 3 are sectional views of the three embodiments of the present invention,
FIG. 4 is an explanatory view of a situation in which the PC board of the present invention is used for the floor of a building, FIG. 5 is a sectional view taken along the line AA, FIG. 6 is an end view of a conventional hollow concrete board, and FIG. 7 is the present invention. Fig. 10 is a perspective view showing the concrete board 1 that was opened to the public by a person, where 10 is a PC
Plate, 11 wide valley part, 12 wide half crest part, 13 PC steel wire,
Reference numerals 14 and 14 'are cover plates, and 18 is a tunnel-shaped hollow portion.

Claims (2)

[Scope of utility model registration request] 1. A unit concrete corrugated plate made of PC concrete which is sequentially spread between beams and is integrated as a floor by floor concrete placed on the beam, the lower surface of which is flat and whose lower surface width is greater than the height of the corrugations. With a wide valley part and half cracks of the same shaped mountain part that connects to the left and right of the valley part,
A unit corrugated sheet body consisting of left and right half-cracked peaks having an uneven surface for connecting to the floor concrete on the upper surface, a PC steel wire in the longitudinal direction that is fixed in the wide valley concrete and maintains the required tension, and A PC concrete plate for a floor, comprising: a field-installed cover plate that covers almost the entire length of the valley concave surface to form a tunnel-shaped hollow portion. 2. A unit concrete corrugated plate made of PC concrete that is sequentially spread between beams and is integrated as a floor by floor concrete placed on the beam, the lower surface of which is flat and whose lower surface width is greater than the height of the corrugations. With a wide valley part and half cracks of the same shaped mountain part that connects to the left and right of the valley part,
A unit corrugated sheet body consisting of left and right half-cracked peaks having an uneven surface for connecting to the floor concrete on the upper surface, a PC steel wire in the longitudinal direction that is fixed in the wide valley concrete and maintains the required tension, and A PC concrete plate for a floor, comprising: a built-in cover plate in which a tunnel-shaped hollow portion is formed so as to cover substantially the entire length of the valley concave surface.