JP2729711B2 - Precast concrete board for composite floorboard construction and composite floorboard construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a composite floorboard using a corrugated precast concrete floorboard and a precast concrete flat plate used in the method.

[0002]

2. Description of the Related Art In the case of a flat floor member, a thin circular spiral sheath tube is usually embedded in the molding of a hollow portion in a conventional synthetic floor plate.

[0003]

However, in order to improve the cross-sectional performance, when a floor member having a triangular cross section is used,
There was no simple and effective means for forming the hollow part. SUMMARY OF THE INVENTION The present invention has been proposed in view of the problems of the prior art, and the object thereof is to improve the cross-sectional performance while securing the weight of the floor member, and to reduce the amount of cast concrete. Another object of the present invention is to provide a method for constructing a composite floorboard capable of reducing the above-mentioned problems and a precast concrete plate used in the method.

[0004]

In order to achieve the above object, a precast concrete plate for constructing a composite floorboard according to the present invention is provided in a longitudinal direction of a precast concrete plate having reinforcing bars arranged in the width direction. At each interval, a notch for bending extending in the width direction alternately in the front and back is provided, and the flat plate is alternately bent in each of the notches, and the corrugated precast concrete floor plate is bent by each of the bent pieces. Is formed.

According to the second aspect of the present invention, a precast concrete slab in which reinforcing bars are arranged in the width direction is provided with bending notches extending in the width direction alternately in the longitudinal direction at predetermined intervals in the longitudinal direction. The obtained precast construction board for constructing a composite floorboard is bent alternately from front to back at each of the cutouts to form a corrugated precast concrete floorboard, and concrete is poured into the floorboard.

According to the third aspect of the present invention, a lightweight hollow molding member is fitted into a space in which the upper end surface formed between adjacent bent portions of the corrugated precast concrete floorboard is open. And after-cast concrete.

[0007]

According to the present invention, as described above, a precast concrete slab having reinforcing bars arranged in the width direction is formed by bending front and back alternately in the width direction at predetermined intervals in the longitudinal direction. By forming a cut portion and alternately bending the flat plate at each of the cut portions, a corrugated precast concrete floor plate having improved cross-sectional performance is formed.

When the corrugated precast concrete slab is constructed, the bent angle of the precast concrete slab is selected to a required angle in accordance with the span and the loading conditions, thereby providing a structurally rational composite floor slab. Is configured. According to a second aspect of the present invention, a composite floor slab having a high structural reliability is constructed by placing concrete on the corrugated precast concrete slab constructed as described above.

The invention according to claim 3 is formed between adjacent bent portions of the corrugated precast concrete floor plate,
By fitting a light-weight hollow part forming member into a space whose upper surface is open, the hollow part can be easily formed, and the weight can be reduced without reducing the cross-sectional performance.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 4, reference numeral 1 denotes a precast concrete plate, and reinforcement bars 2 are arranged in the width direction. In the longitudinal direction of the flat plate 1, bent notches 3 extending in the width direction alternately in the front and back are provided at predetermined intervals, and the flat plate 1 is alternately bent up and down in each of the cut portions 3. A corrugated precast concrete floor panel A is formed by each of the bent pieces 1a. (See FIGS. 1 and 2) At this time, the bent portion 1a of the flat plate 1 is bent at an arbitrary angle in accordance with the span and the load condition, thereby achieving a structurally reasonable response to the span and the load condition. A simple composite floorboard can be constructed.

The precast concrete slab A constructed as described above is laid between beams, and post-cast concrete B is cast on the slab A to form a composite slab. FIG. 1 shows a composite floorboard constructed according to the invention for a long span, large load, and FIG. 2 shows a composite floorboard constructed according to the invention for a small span, small load.

FIG. 3 shows an embodiment of the present invention in which the weight of the composite floor slab is reduced, and the upper end face formed between adjacent bent parts 1a of the corrugated precast concrete floor slab A is opened. After fitting a lightweight hollow part forming member C such as Styrofoam into the open space, a post-cast concrete B is cast to secure the weight of the composite floor and improve the cross-sectional performance. The amount of concrete can be reduced.

In each of the above embodiments, the reinforcing bars 2 are made of a prestressed tensile steel material, so that the structural performance of the composite floor can be further improved.

[0014]

According to the present invention, as described above, a precast concrete plate having reinforcing bars arranged in the width direction is formed by bending the front and back alternately in the width direction at predetermined intervals in the longitudinal direction. By alternately bending front and back at an arbitrary angle in the cut portion to form a corrugated precast concrete floor plate, and selecting the bending angle of the flat plate, it is possible to configure a composite floor plate corresponding to a span and a load condition. Things. In addition, the folding of the flat plate does not require a special facility such as a hinge, and the configuration is simplified.

According to a second aspect of the present invention, a precast concrete slab is bent alternately from front to back using a cut portion extending alternately in the width direction to form a corrugated precast concrete slab, and concrete is formed on the floor slab. By casting, composite floorboards can be easily constructed.
The invention according to claim 3 provides a floor member by fitting a lightweight hollow molded member into a space having an open upper surface formed between adjacent bent portions of the corrugated precast concrete floor plate. It is possible to improve the cross-sectional performance while securing the weight of the concrete, and to reduce the amount of cast concrete.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a composite floorboard constructed by the method of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the composite floorboard constructed by the method of the present invention.

FIG. 3 is a longitudinal sectional view showing still another embodiment of the composite floorboard constructed by the method of the present invention.

FIG. 4 is a longitudinal sectional view of a precast concrete plate.

[Explanation of symbols]

 A corrugated precast concrete floor plate B back-cast concrete C hollow part forming member 1 precast concrete flat plate 1a bent piece 2 reinforcing bar

Claims (3)

(57) [Claims] Claims: 1. At predetermined intervals in a longitudinal direction of a precast concrete plate having reinforcing bars arranged in the width direction,
Bending notches extending in the width direction are provided alternately on the front and back, and the flat plate is alternately bent at each of the notches, and a corrugated precast concrete floor plate is formed by each of the bent pieces. A precast concrete plate for constructing a composite floorboard, which is constituted as described above. 2. A precast for constructing a composite floorboard in which a notch for bending extending in the width direction alternately in front and back is provided at predetermined intervals in the longitudinal direction of a precast concrete slab having reinforcing bars arranged in the width direction. A method for constructing a composite floorboard, comprising: forming a corrugated precast concrete floorboard by alternately bending a building board at each of the cutout portions to form a corrugated precast concrete floorboard and placing concrete on the floorboard. 3. A lightweight hollow molded member is fitted into a space in which an upper end surface formed between adjacent bent portions of the corrugated precast concrete floorboard is opened.
The method for constructing a composite floorboard according to claim 2, wherein post-cast concrete is cast.