JP2527115B2 - Manufacturing method of precast concrete plate - 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 producing precast concrete boards, so-called full precast concrete boards.

[0002]

2. Description of the Related Art A precast concrete plate, which is a so-called full precast concrete plate, is usually manufactured by the methods shown in (1) and (2) of FIG. The method (1) is a method of producing the double-sided mold 20 and manufacturing the precast concrete board 30 by vertical casting,
In addition, the method (2) is the form 5 having only the small edge portion on the flat plate surface 40.
0 was formed and the concrete 60 was flat-cast, and the upper surface was manufactured by plastering with a trowel finish.

[0003]

However, according to the method (1), since the double-sided mold is formed, the manufacturing cost of the mold is high and it is difficult to drive the tiles, and (2)
However, since the plastering work is done by plastering on one side, the method of (1) has a problem that it requires labor and is inaccurate. The present invention has been made in view of the above problems, and an object thereof is to provide a method for manufacturing a precast concrete plate that is economical and highly accurate without a labor.

[0004]

The method of manufacturing a precast concrete board according to the present invention for solving the above-mentioned problems is such that the upper part of the truss bar projects from the upper surface of the concrete board.
And the upper surface is brushed or broom finished
When forming a buffed semi-precast concrete board
A concrete board with the same dimensions as the concrete board
Place concrete in the formwork to be formed and
Reverse the reinforced concrete plate to finish the brushing or
Strike the inside of the formwork with the broom-finished surface facing down.
Closing the upper surface of the formwork by overlapping it on the installed concrete
Then, with the upper surface of this formwork closed, precast concrete
Concrete board with vibration applied to the reed board
And concrete are joined over the entire surface.
It is to make it.

[0005]

According to the present invention, the semi-precast concrete plate in which the upper part of the truss bar is projected from the upper surface of the concrete plate is inverted, and the concrete and the concrete plate are integrated by superposing the concrete placed in the formwork. As a result, it is possible to manufacture an economical and highly accurate full precast concrete plate without much effort. In addition, the concrete that is integrally joined to the concrete in the formwork
The top surface of the reed board is brushed or broom finished.
Therefore, it is concrete with the semi-precast concrete board.
The joining accuracy with the board becomes higher. Furthermore, by closing the upper surface of the formwork
The precast concrete board with vibration
The concrete board and concrete over the entire surface
By joining, the semi-precast concrete board
Since it acts as an upper lid and presses concrete,
The REIT does not protrude from the formwork, and the concrete
It is possible to fully compact the chair.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a precast concrete board, and FIG. 2 is a perspective view of a truss bar. The precast concrete plate 1 is formed by integrally joining two concrete plates 2 and 3 with a truss bar 4.
Are laid in the concrete plates 2 and 3 on both sides with the reinforcing bars arranged at appropriate intervals in the long side direction.

As shown in FIG. 2, the truss reinforcement 4 has one upper end reinforcement 4a and two lower end reinforcements 4b arranged at each vertex of an isosceles triangle, and these upper end reinforcements 4a and 4b. It is formed in a triangular prism shape by the wavy lattice muscles 4c arranged between and.

Next, a method of manufacturing this precast concrete board will be described. First, as shown in FIG. 3, the longitudinal bars 1a and the lateral bars 1b are arranged in the form 5, and the truss bars 4 are arranged at appropriate intervals along the long side direction. The truss reinforcement 4 is arranged in an inverted V-shape so that the upper end reinforcement 4a is located above the upper surface of the form 5.

Next, concrete 6 is cast in the mold 5 and the upper surface is brush-finished or broom-finished. When the concrete 6 hardens and develops a predetermined strength, it is demolded. The semi-precast concrete board 7 is manufactured.

Next, as shown in FIG. 4, after placing the concrete 3 by arranging the vertical streaks 3a and the horizontal streaks 3b in the mold 5a separate from the above, the semi-precast concrete board 7 is placed on the concrete 3. And truss muscle 4
The upper part of is embedded in concrete 3. Then, the semi-precast concrete board 7 is vibrated by a vibrator to integrate the concrete board 2 and the concrete 3. Next, the concrete 3 is hardened to exhibit a predetermined strength, and then demolded to manufacture the precast concrete plate 1.

FIG. 6 is a cross-sectional view in which the truss bars 4 are arranged not only in one direction but also on a lattice, and FIG. 7 is a precast concrete board 1 having tiles 8 attached to the surface thereof.
FIG. The driving of the tiles 8 is performed when the semi-precast concrete board 7 is manufactured.

[0012]

[Effect of the Invention] The semi-precast concrete plate in which the upper part of the truss bar is projected from the upper surface of the concrete plate is inverted and superposed on the concrete placed in the formwork to integrate the concrete and the concrete plate. As a result, it is possible to manufacture an economical and highly accurate full precast concrete plate without much effort. Ma
Semi-pre-coated with brushed or broom-finished upper surface
Invert the cast concrete plate and
Joint with concrete by joining it to the concrete
Higher accuracy.

With the upper surface of the mold closed, the precast core
Add vibration to the concrete plate
By joining the tote plate and concrete over the entire surface,
Pre-cast concrete board as the top cover
As the concrete is pushed from inside the formwork,
No need to put it out, and enough compaction of concrete
Can be done.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a precast concrete board.

FIG. 2 is a perspective view of a truss muscle.

FIG. 3 is a cross-sectional view showing a method of manufacturing a semi-precast concrete plate.

FIG. 4 is a cross-sectional view showing a state in which a semi-precast concrete plate is inverted and overlaid on concrete in a formwork.

FIG. 5 is a cross-sectional view showing a state in which a semi-precast concrete plate is inverted and superposed on concrete in a formwork.

FIG. 6 is a cross-sectional view of a precast concrete plate in which truss bars are arranged in a grid.

FIG. 7 is a cross-sectional view of a precast concrete board to which tiles are attached.

8 (1) and (2) are cross-sectional views showing a conventional method for manufacturing a precast concrete plate.

[Explanation of symbols]

 1 Precast concrete board 2 Concrete board 3 Concrete 4 Truss reinforcement 5, 5a Formwork

Claims (1)

(57) [Claims] 1. The upper surface of the truss bar from the upper surface of the concrete plate
And the upper surface is brushed or broomed
Form a finished semi-precast concrete board
Together with concrete of the same size as the concrete plate
Place concrete in the formwork that forms the plate,
Invert the cast concrete plate to finish the brush
Or with the broom-finished surface facing down, in the formwork
On top of the concrete placed on the
Close the precast cast with the upper surface of the form closed.
Add vibration to the concrete plate
A method for producing a precast concrete plate, characterized in that the tote plate and the concrete are joined over the entire surface .