JP2000226899A - Lattice-shaped hollow slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lattice-shaped hollow slab capable of minimizing a thickness of a slab layer in a strength allowable range by arranging bar arrangement of sub-reinforcements in an efficient lattice shape around a hollow part in a slab at slab work of a long span such as a bridge and a building in civil engineering construction. SOLUTION: In a slab 1 for arranging a main reinforcement between a surface of the slab 1 and a hollow part 2, a section is formed so that the hollow part 2 in the slab 1 can be partitioned small in the lengthwise direction in a range of not exceeding a diameter of the hollow part 2, sub-reinforcements 4 are arranged in a concrete area of a diametrically small part of the hollow part 2, and these are arranged in a lattice shape of crossing the main reinforcement 3. In this case, a pipe diameter of the hollow part in the slab is made different in the lengthwise direction, the sub-reinforcements are effectively arranged in a pipe diameter small part, and weight is reduced while thinning a thickness of the slab to obtain a highly strong slab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid-type hollow slab, and more particularly, to a slab having a hollow portion when a long span (SPAN) such as a bridge or a building is constructed in civil engineering. And, by arranging reinforcing bars of the auxiliary muscles in a lattice shape close to the hollow portion, it is intended to reduce the thickness of the slab layer and to obtain a high strength slab while reducing the weight of the slab. .

[0002]

2. Description of the Related Art Generally, slab construction of bridges and buildings is performed by making a mold, drawing ink, arranging a lower main bar and a lower secondary bar → equipment such as electricity, communication and fire fighting → installing hollow pipes → A hollow slab is constructed by sequentially arranging the upper main reinforcing bar and the upper auxiliary reinforcing bar → laying concrete → curing.

[0003] By forming a hollow portion in the above-mentioned hollow slab, the amount of laying concrete, which is about the area of the hollow portion of the hollow tube, is reduced. Lightening of slab. The strength of the slab layer increases. The concrete between the slab and the hollow tube is formed into an "I" shape, which increases the strength against bending stress. At the time of the ceiling work of the building, the installation of the support pillar (beam) is eliminated. In order to obtain such effects, hollow tubes are widely used as mechanical structures in slab construction.

[0004] In conventional civil engineering, at the time of slab construction of a bridge or a building, a mold is installed, main and auxiliary reinforcing bars are arranged at upper and lower portions, hollow pipes are installed, and concrete is laid. Thus, the hollow slab is formed, but the hollow portion formed by the hollow tube has a problem that the concrete is cracked because the closed cuts on both sides are formed at right angles.

[0005] That is, since the hollow portion is sealed,
The hollow part expands or contracts according to the change in temperature.
This causes cracks in the concrete around the hollow part.Since both sides of the hollow part form a right angle, the point where the concrete structure and the slab come into contact is the most vulnerable to the load. Works, causing the surrounding concrete to crack.

Therefore, the present inventor has devised to solve the above-mentioned problems, and in the hollow slab filed in the earlier application, the cut portion of the hollow portion is formed with a gentle slope to release the air in the hollow portion. Although the concrete is prevented from cracking by flowing with the outside air, the difficulty associated with the slab having a long span (SPAN) and the layer height of the slab layer could not be solved.

In other words, in the arrangement of the main reinforcing bar and the auxiliary reinforcing bar around the hollow portion in the slab, the main reinforcing bar is disposed long in the same direction as the hollow portion, and gives strength to concrete between the hollow portions. Since the secondary bars are installed crossing over the main bars, the secondary bars only reinforce the main bars and prevent cracks from being generated on the surface of the slab, but have no effect on the strength of the slab itself. However, there is a problem that the thickness of the slab layer is thickened.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention has been devised in order to solve the above-mentioned conventional problems, and is intended to effectively arrange the main and auxiliary muscles of the slab to increase the thickness of the slab. It is an object of the present invention to make the slab thinner and lighter and to obtain a stronger slab.

[0009]

In order to achieve the above-mentioned object, a hollow portion in a slab is divided at a fixed interval so as to have a different diameter from each other, and a portion having a smaller diameter than the hollow portion is formed.
It is intended to provide a slab in which the auxiliary muscles are arranged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of the present invention with reference to the accompanying drawings. FIG. 1 is a perspective view of one embodiment of a cross section of a slab constituted by the present invention. Since the present invention is often applied to a slab having a long span, only a part is extracted from the drawing. What did
FIG. 2 shows a state in which a hollow portion, a main bar, and an auxiliary bar are arranged in a slab, and FIG. 2 is a longitudinal sectional view of one embodiment of the present invention.
FIG. 3 illustrates a state in which accessory bars are arranged in a portion having a smaller diameter than the hollow portion. FIG. 3 is a longitudinal sectional view of another embodiment of the present invention, in which a hollow portion in a slab is separated.
It is the figure which showed the pattern of the arrangement | positioning of a secondary muscle.

As shown in the figure, in a slab 1 in which a hollow portion 2 and a main reinforcement 3 are installed, the hollow portions 2 in the slab 1 are divided at regular intervals so as to have different diameters from each other. This is a structure in which the accessory muscle 4 is arranged in a reduced portion within a range not exceeding.

The hollow portion 2 is formed by a hollow tube.
The hollow tube is an annular or spiral wrinkled tube made of a material such as a synthetic resin, metal, or nonmetal. Since this hollow tube only needs to have a hollow part, it can be appropriately selected and used as needed, but in consideration of the strength of the slab, it has an annular or spiral wrinkle that plays the role of reinforcing force. It is desirable to use pipes that have been cut.

Although the hollow portion 2 is formed over the entire slab having a long span, the hollow portion 2 may penetrate the entire hollow portion 2 or may partition the hollow portion 2.

That is, the hollow tubes forming the hollow portion 2 are connected to each other for the length of the slab 1. The hollow tubes can be penetrated without connecting portions, or the short hollow tubes can be connected to each other. Can be achieved. The hollow tube may be formed by dividing the hollow portion 2. Therefore, a method convenient for construction may be selected and used.

The main reinforcing bar 3 and the auxiliary reinforcing bar 4 are arranged in such a manner that the reinforcing bars are arranged in order to give strength to the slab while curing the concrete in the slab 1. The main reinforcing bar 3 has the same length as the hollow portion 2. The auxiliary muscle 4 is arranged so as to cross the main muscle 3.

In the slab 1, a main reinforcing bar 3 is provided between the slab surface and the hollow portion 2, and a secondary bar 4 is arranged in a portion having a smaller diameter than the hollow portion 2.
The accessory muscle 4 is arranged in a section separated between.

The following is an explanation of the present invention constructed as described above, with attention paid to the effects of the operation represented by the embodiment.

When constructing a bridge or a building, after installing the structure, work on the slab 1 is performed between the structures. By arranging the hollow pipes and laying concrete after arranging the concrete and curing the concrete, the concrete in the hollow part 2 can be saved, and the slab 1 having higher strength can be formed by the main reinforcement 3 and the auxiliary reinforcement 4. Be composed.

That is, concrete is laid between the surface of the slab 1 and the hollow portion 2 after the main reinforcement 3 and the sub reinforcement 4 are installed. Therefore, the lattice in which the main reinforcement 3 and the sub reinforcement 4 intersect is installed. Since it takes a shape, the strength of the slab 1 is increased while preventing cracks in the concrete itself.

On the other hand, the main reinforcement 3 is provided between the surface of the slab 1 and the hollow portion 2 in the same direction as the hollow portion 2 to give strength to the slab 1 at that portion. Since the slab 1 is installed in a lattice shape across the main reinforcement 3 between the portions 2, the slab 1 is given more strength.

Accordingly, since the main reinforcement 3 and the auxiliary reinforcement 4 are provided between the surface of the slab 1 and the hollow portion 2, the auxiliary reinforcement 4 is smaller in the hollow portion 2 than in the conventional case where the thickness of the slab 1 is increased. Since the slab 1 is installed at the pipe diameter, the thickness of the slab 1 can be reduced to that extent.

After all, in the section where the pipe diameter of the hollow part 2 is constant,
As the structure is made smaller, the area where the concrete is laid in that part is made wider so that
The technical configuration of arranging the reinforcing bar 4 in the concrete area formed by the reduction of the hollow portion 2 irrespective of the shape of the hollow portion 2 is within the scope of the present invention. It can be said that it is inside.

[0023]

In the hollow part in the slab, and in the slab configured by installing the main and auxiliary muscles, the pipe diameter of the hollow part is given a difference in the length direction so that the pipe diameter can be reduced to a small part. In addition, there is a feature that the reinforcing bars are effectively arranged so that the slab is reduced in weight while reducing the thickness thereof to obtain a slab having high strength.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a cross section of a slab configured according to the present invention.

FIG. 2 is a longitudinal sectional view of one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of another embodiment of the present invention.

[Explanation of symbols]

 1 Slab 2 Hollow part 3 Main bar 4 Secondary bar

Claims (1)

[Claims] 1. A slab (1) in which a main reinforcing bar (3) is installed between the surface of the slab (1) and the hollow portion (2), wherein the hollow portion (2) in the slab (1) has a length. In the direction, a small section is formed within a range not exceeding the diameter of the hollow part (2), and a secondary reinforcing bar (4) is arranged in a concrete area where the diameter of the hollow part (2) is small, A lattice-shaped hollow slab which is installed in a lattice shape intersecting with a main reinforcing bar (3).