JPH05148931A - Floor plate - Google Patents

Abstract

(57) [Abstract] [Purpose] High strength and long span,
And a floor board with excellent workability in construction. [Composition] Shear reinforcement that is bent in a corrugated shape on the upper surface, and
The unbonded PC steel wire is wired in two directions orthogonal to each other on the upper surface of the PC plate on which the vertical streak fixed to the corrugated top is provided.
A floorboard made of concrete and prestressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor board composed of a precast concrete board (hereinafter referred to as a PC board) which also serves as a formwork and a concrete layer cast on the upper surface thereof.

[0002]

SUMMARY OF THE INVENTION The present invention can greatly reduce the time and labor required for formwork and bottom reinforcement, and reduce the supporting work to widen the work space on the lower floor to improve workability in construction. It is an object of the present invention to propose a floor board which can improve the heat resistance, has high strength, is less prone to cracking and bending, and can have a long span.

[0003]

[Means for Solving the Problems] This floor board is a P that also serves as a formwork.
In a floor board composed of a C board and a concrete layer cast on the upper surface of the C board, the PC board is provided with a shear reinforcing bar bent in a corrugated shape along the long side direction and a vertical bar fixed to the corrugated top part on the upper surface. In the concrete layer, unbonded PC steel wires are wired in two directions orthogonal to each other, and prestress is introduced.

[0004]

In this floor board, the PC board which constitutes the lower layer of the floor board functions as a truss structure in which the corrugated shear reinforcing bar and the vertical bar project on the upper surface and function as a truss structure. Since prestress is introduced into the PC steel wire, the floorboard and the upper concrete layer are firmly bonded together, exhibiting high strength and preventing the occurrence of cracks and excessive bending,
A longer span can be achieved. The unbonded PC steel wire can be arranged in parallel with the directions of the shear reinforcing bar and the longitudinal bar, or can be inserted through the corrugated shear reinforcing bar and arranged orthogonally, so that it does not hinder the bar arrangement. Since the PC plate is provided with a shear reinforcing bar and a vertical bar projecting, it is not necessary to arrange the bottom bar. In addition, the PC board is reinforced by shear reinforcements, vertical reinforcements, and embedded reinforcements, so flooring can be done with reduced support work.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a PC board 1 which also serves as a formwork and constitutes the lower layer of this floor board. This PC board 1 has a grid-shaped reinforcing bar 2 embedded therein, and a plurality of parallel shear reinforcing bars 3 are formed on the upper surface of the PC plate 1 to form a pair of two linearly bent corrugations along the long side direction. The corrugated tops of the two reinforcing bars 3 forming a pair are fixed by interposing the vertical bars 4 therebetween. The PC board 1 has a length of 6000 mm, a width of 2400 mm, and a width of 1800 mm, and four and three pairs of shear reinforcing bars are juxtaposed in parallel.

A floorboard constructed by using the PC board 1 will be described below with reference to its construction example.

In FIG. 2, on the square surface on which the floorboard having the reinforced concrete columns 5 built in at the four corners should be constructed, P
Lay out the C plates 1. The reinforced concrete column 5 is formed with a capital 6 in advance at a predetermined height position, and the PC board 1 is placed between the capitals 6 and 6, with its short side edge placed on the edge of the capital 6, Three PC boards 1 are laid side by side in a central portion surrounded by four PC boards 1.

Next, as shown in FIG. 3, on the laid PC boards, between the two capitals 6 and 6, on both sides of the reinforced concrete column 5, 2, 2, 1 and 5 in total, respectively. Two unbonded PC steel wires 7 are arranged in each of the XY2 directions orthogonal to the center of the floor plate surface.

As shown in FIGS. 4, (a), (b), (c), and (d), each unbonded PC steel wire 7 has a rise, and is positioned downward at the center and upward at both ends. To do. The unbonded PC steel wire 7 wired in the long side direction of the PC plate 1 is arranged in parallel with the shear reinforcing bar 3. PC oriented in the X direction at the center
As shown in FIG. 6, the unbonded PC steel wire 7 in the short side direction of the plate is arranged by inserting it through the shear reinforcing bar 3 (the end portion is at the upper position (a) and the central portion is at the lower position (b)).

As described above, the unbonded P
After arranging the C steel wire 7, as shown in FIG. 5, a lattice-shaped upper end bar 8 is laid on the upper surface and concrete 9 is placed. After the solidification of the concrete 9, the unbonded PC steel wire 7 is tensioned to introduce prestress.

[0011]

The present invention is as described above, and this floor board has high strength and can be made to have a long span. At the time of construction, it is possible to reduce the work of formwork and bar arrangement, reduce the support work and improve workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partial cross section of a PC board.

FIG. 2 is a plan view showing a state where PC boards are lined up.

FIG. 3 is a plan view showing a state in which unbonded PC steel wires are wired.

4 (a), (b), (c), and (d) are respectively (a-
It is a), (bb), (cc), (dd) sectional drawing.

FIG. 5 is a cross-sectional view of a portion of FIG. 3 (e-e) of a floorboard in which upper end bars are arranged, concrete is cast, and prestress is introduced.

6 (a) and 6 (b) are explanatory views showing the relational positions of the shear reinforcing bar and the unbonded PC steel wire, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... PC board, 2 ... reinforcing bar, corrugated shear reinforcing bar, 4 ... longitudinal bar, 5 ... reinforced concrete column, 6 ... capital, 7 ... unbonded PC steel wire, 8 ... upper bar, 9 ... concrete.

Claims (1)

[Claims] 1. A floorboard consisting of a precast concrete board that also serves as a formwork and a concrete layer cast on the top surface of the precast concrete board, wherein the precast concrete board is a shear reinforcing bar bent in a corrugated shape along the long side direction and its corrugated shape. A floorboard having vertical streaks protruding from the top, and unbonded PC steel wires wired in two directions perpendicular to the concrete layer to introduce prestress.