JPH0868142A - Precast concrete board - Google Patents

Abstract

PURPOSE: To construct a precast concrete board without requiring a formwork. CONSTITUTION: Built-up reinforcing bar trusses 3 are arranged between reinforced concrete boards 2 facing each other at a proper interval, and the upper end side and lower end side of the built-up reinforcing bar trusses 3 are buried in two reinforced concrete boards 2. Reinforcing bar braces 4 are crossingly arranged between the reinforcing concrete boards 2 in the direction perpendicular to the built-up reinforcing bar trusses 3, and both end sections are welded to reinforcing bars 2a in the reinforced concrete boards 2 respectively.

Description

Detailed Description of the Invention

The present invention relates to precast concrete boards.

[0002]

2. Description of the Related Art Conventionally, in the case of constructing a reinforced concrete wall, the wall reinforcement is arranged to form a formwork, and concrete is placed on the formwork, or an outer formwork is made of a precast concrete plate. It was constructed by placing concrete on the formwork formed in.

[0003]

However, since all the reinforced concrete walls as described above are constructed by forming a formwork, it takes a lot of time and labor in recent years where skilled engineers such as formworkers are lacking. However, the workability could not be improved. The present invention has been made in view of these problems, and an object thereof is to provide a precast concrete board that can be constructed without the need for a formwork.

[0004]

In the precast concrete plate of the present invention for achieving the above-mentioned problems, a plurality of assembled reinforcing bar trusses are arranged between reinforced concrete plates arranged facing each other at appropriate intervals, and the assembled reinforcing bar trusses are Reinforcing bar braces are spanned between reinforced concrete plates in a perpendicular direction, and the assembled reinforcing bar truss is formed by arranging corrugated lattice reinforcing bars between upper and lower upper and lower one reinforcing bars. The reinforced concrete plates are opposed to each other in a state of being displaced from each other in the length direction or the width direction, and one of the reinforced concrete plates is wider or longer than the other, and the assembled reinforced truss is predetermined. The structure is characterized in that the bar is inclined in the direction of.

[0005]

By constructing the precast concrete plate of the present invention at the wall construction site and placing concrete between the two reinforced concrete plates, it is possible to construct a wall without the need for a formwork as in the prior art. . In addition, a reinforcing bar brace is laid between the reinforced concrete plates at right angles to the assembled reinforcing bar truss, and the assembled reinforcing bar trusses are arranged so as to incline in a predetermined direction, increasing the rigidity of the reinforced concrete plate orthogonal to the assembled reinforcing bar truss. The deformation can be prevented. Moreover, since the reinforced concrete plates are opposed to each other in a state where they are displaced from each other in the length direction or the width direction, when these are joined, the joint positions of the reinforced concrete plates can be displaced, so that the strength of the joint can be increased. it can. Further, by making one of the reinforced concrete plates wider or longer than the other, the precast concrete plates can be easily joined to each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of a precast concrete board according to the present invention, FIG. 2 is a vertical cross-sectional view of the same, FIG. 3 is a perspective view of an assembled rebar truss, and FIG. 4 is a cross-sectional view of a precast concrete board in use.

In the precast concrete plate 1, an assembled reinforcing bar truss 3 is arranged between reinforced concrete plates 2 facing each other at an appropriate interval, and the upper end side and the lower end side of the assembled reinforcing bar truss 3 are embedded in these two reinforced concrete plates 2. ing.

Reinforcing bar braces 4 are arranged between these reinforced concrete plates 2 in a direction orthogonal to the assembled reinforcing bar truss 3, and both ends thereof are respectively welded to the reinforcing bars 2a in the reinforced concrete plate 2. There is.

Further, the reinforcing bar braces 4 are arranged at appropriate intervals orthogonal to the assembled reinforcing bar truss 3 to enhance the rigidity of the reinforced concrete plate 2 in the short side direction. Although the reinforcing bar braces 4 are arranged so as to intersect with each other, the reinforcing bars may be arranged so as to be inclined only in a certain direction without intersecting.

The assembled reinforcing bar truss 3 is formed by arranging a corrugated lattice reinforcing bar 3c between one upper and lower upper reinforcing bar 3a and one lower end reinforcing bar 3b, and is arranged along the longitudinal direction of the reinforced concrete plate 2, The upper end bar 3a and the lower end bar 3b are welded to the reinforcing bar 2a in the reinforced concrete plate 2.

As shown in FIG. 4, this precast concrete plate 1 is continuously built between columns 5, connecting joints 6a are arranged at the joints 6, and at the same time the reinforced concrete plates 2 are cast on site. Concrete 7 is poured to construct a wall 8.

FIGS. 5 and 6 show the case where the precast concrete plate 1 is joined to the floor slab 9 and the case where it is joined to the beam 10. In both cases, the formwork is also used. As in the conventional case, the wall mold can be omitted.

FIG. 7 shows a precast concrete plate 11 in which the reinforced concrete plates 2 are opposed to each other while being displaced from each other in the longitudinal direction. Since the reinforced concrete plates 2 of this precast concrete plate 11 are displaced from each other, the joining positions of the reinforced concrete plates 2 can be displaced from each other when they are continuously joined in the lateral direction as shown in FIG. . As a result, the effective thickness of the wall 8 can be a thickness (a + b) obtained by adding the thickness b of the reinforced concrete plate 2 to the post-cast concrete portion a.

FIG. 8 shows a precast concrete plate 12 in which one of the reinforced concrete plates 2 is longer than the other. This is used when joining to the pillar 5 as shown in FIG. 9, and the undisplaced end of the reinforced concrete plate 2 is installed on the pillar 5 side, and the displaced end is installed on the opposite side of the pillar 5.

Others The precast concrete board 1
1 is used in the case of joining at a right angle and in the case of joining in a T shape, as shown in FIGS.

Further, FIG. 12 shows a precast concrete plate 13 in which the assembled reinforcing bar truss 3 is inclined in a V shape in order to increase the rigidity of the reinforced concrete plate 2 in the short side direction.
Is. This may be formed by inclining all of the assembled reinforcing bar trusses 3, or may be formed by inclining a part of the assembled reinforcing bar trusses 3.

[0017]

EFFECTS OF THE INVENTION A precast concrete plate is built in a wall construction site, and concrete is placed between two reinforced concrete plates, whereby a wall can be constructed without the need for a formwork as in the conventional case.

The rigidity of the reinforced concrete plate in the direction orthogonal to the assembled reinforced truss is obtained by arranging the reinforced brace between the reinforced concrete plates in a direction orthogonal to the assembled reinforced truss, and by arranging the assembled reinforcing bar truss in a predetermined direction. The deformation can be prevented by increasing

Since the reinforced concrete plates are opposed to each other in a state where they are displaced from each other in the lengthwise direction or the widthwise direction, when these are joined together, the joining positions of the reinforced concrete plates can be shifted so that the effective thickness of the wall is reduced. It can be made large and the strength of the joint can be increased.

By making one of the reinforced concrete plates wider or longer than the other, the precast concrete plates can be easily joined to each other.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of a precast concrete board.

FIG. 3 is a perspective view of an assembled rebar truss.

FIG. 4 is a cross-sectional view of a precast concrete board in use.

FIG. 5 is a cross-sectional view in which a precast concrete plate is joined to a floor slab.

FIG. 6 is a cross-sectional view in which a precast concrete plate is joined to a beam.

FIG. 7 is a cross-sectional view of a precast concrete plate in which reinforced concrete plates are offset from each other.

FIG. 8 is a cross-sectional view of a precast concrete plate obtained by shifting one of the reinforced concrete plates.

FIG. 9 is a cross-sectional view of the precast concrete plate of FIGS. 7 and 8 in use.

FIG. 10 is a cross-sectional view in which precast concrete boards are joined at a right angle.

FIG. 11 is a cross-sectional view in which precast concrete boards are joined in a T shape.

FIG. 12 is a cross-sectional view of a precast concrete plate in which the assembled reinforcing bar truss is in a V shape.

[Explanation of symbols]

 1, 11, 12, 13 Precast concrete plate 2 Reinforced concrete plate 3 Assembly rebar truss 4 Reinforced brace 5 Column 6 Joint 7 Cast-in-place concrete 8 Wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kohei Kurita 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Institute of Technology Ltd. (72) Inventor Yasufumi Tobishima 2-4-11 Sarugaku-cho, Chiyoda-ku, Tokyo Japan Kaiser Within the corporation

Claims (4)

[Claims] 1. A plurality of assembled reinforcing bar trusses are arranged between reinforced concrete plates arranged facing each other at appropriate intervals,
Reinforcing bar braces are spanned between reinforced concrete plates in a direction orthogonal to the assembled reinforcing bar truss, and the assembled reinforcing bar truss is formed by arranging corrugated lattice reinforcements between upper and lower one upper and lower reinforcements. Precast concrete board featuring. 2. The precast concrete board according to claim 1, wherein the reinforced concrete boards are opposed to each other while being offset from each other in the length direction or the width direction. 3. The precast concrete board according to claim 1, wherein one of the reinforced concrete boards is wider or longer than the other. 4. The precast concrete board according to claim 1, wherein the assembled rebar truss is arranged so as to be inclined in a predetermined direction.