JP2671785B2 - Reinforcement method of the top floor column head of reinforced concrete construction - 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 reinforcing a top reinforced concrete head part of a reinforced concrete structure, and an object thereof is to improve the anchoring property of a beam main bar to the top reinforced pillar part.

[0002]

2. Description of the Related Art An anchorage of a beam main bar to a column head of a middle pillar on the uppermost floor is not particularly problematic because a sufficient anchor length can be secured by penetrating the beam main bar in the column when the column width is sufficiently large. But,
If the column width is narrow, the fixing length will be insufficient if it is penetrated. For this reason, it is necessary to bend some of the main beams of the beam into the column to secure a fixed length. As a result, the panel zone portion is congested by the beam main bars and column bars from four directions, and the filling property of concrete is deteriorated. In order to avoid this, the present conditions are to reduce the number of beam main bars and increase the beam cross section to compensate for it, or to unnecessarily increase the column cross section and increase the anchor length.

[0003]

Unnecessarily increasing the beam cross section and the column cross section of the conventional method is necessary to secure the anchor length of the beam main bar without deteriorating the filling property of concrete in the panel zone part. This is a bad method, and there is a desire to eliminate it.

[0004]

According to the present invention, even if the anchor length of the beam main bar is somewhat short, if the adhesion strength of the beam main bar to the concrete at the anchoring part to the column can be sufficiently high, the result will be sufficient. It was made paying attention to the ability to secure the anchorage, and its purpose is to ensure sufficient anchorage of the beam main bar to the column, and further to eliminate the above-mentioned necessary evil.

Since the breaking strength of the cover concrete at the top of the column is the decisive factor for the bond strength of the top beam main bar of the top floor column head to the concrete, the higher the breaking strength of the cover concrete, the higher the bond strength. Get higher The present invention is a reinforcing construction method for improving the breaking strength of cover concrete on the top of a column, and since cover concrete is reinforced and strengthened by the present invention, the adhesion strength of the top beam main bar of concrete at the anchoring portion to the concrete increases. , The anchorage of the upper beam main bar that penetrates the inside of the column is greatly improved.

Therefore, it is possible to reduce the number of bars that are bent into the columns of the upper end beam main bars, and to eliminate them depending on the conditions. As a result, the congestion of the reinforcing bars in the panel zone is alleviated, the filling property of the concrete is also improved, and it is not necessary to enlarge the beam section or the column section unnecessarily, and the problems of the conventional method are solved.

According to the present invention, concrete is installed in a state in which a wire mesh with legs in which deformed reinforcing bars are welded as legs is installed at each intersection of a grid-shaped wire mesh in which reinforcing bars are welded, is installed on the upper end beam main bar in the panel zone of the uppermost column head. After placing, the first invention of the reinforcing method of the top floor column head of the reinforced concrete construction, which performs the compaction in the hardening process of the concrete, and the compaction of the concrete placed in the top floor column head The top floor of a reinforced concrete structure characterized in that a perforated iron plate with a large number of holes is placed on the concrete surface at a certain time, and the perforated iron plate is pushed into the concrete surface while vibrating. The second invention of the method of reinforcing the pillar head.

A first aspect of the present invention is a method for reinforcing cover concrete by embedding a grid-like wire mesh in the cover concrete at the top of a column and compacting it in the hardening process of the cover concrete to form a solid cover concrete. The second invention is a method for reinforcing cover concrete, in which a perforated iron plate is pushed into the surface of cover concrete immediately after placing the cover concrete to reinforce the concrete from the surface and to form solid cover concrete.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

The first invention will be described with reference to FIG.

FIG. 1 shows an example of a legged wire mesh used in the first invention and an example in which the legged wire mesh is installed in the panel zone of the uppermost column head, (a) is a perspective view of the legged wire mesh,
(B) is an elevation view of the legged wire mesh, (c) is a plan view of the panel zone, and (d) is a longitudinal sectional view of the panel zone.

As shown in FIGS. 1 (a) and 1 (b), a metal mesh with legs 3 in which deformed reinforcing bars are welded as legs 2 is used at each intersection of a grid-shaped metal mesh in which a large number of reinforcing bars 1 are welded.
This legged wire mesh 3 is placed on the upper beam main bar 4 of the pillar head in the panel zone as shown in FIGS. 1 (c) and 1 (d). At this time, if there is a risk that the legged wire netting 3 will be displaced, it is bound and fixed to the upper beam main bar 4 at an appropriate position. In this state, drive the pillar and beam concrete as usual,
Compact. At the time when the hardening of the concrete has progressed slightly and it is suitable for compaction, the cover concrete 9 at the top of the pillar is compacted with a metal iron or the like to make it solid. The legged wire mesh 3 is fixed to the panel zone concrete by the legs 2 and the cover concrete 9 is reinforced by the many reinforcing bars 1. Cover concrete 9
Is compacted and solid.

The second invention will be described with reference to FIG.

FIG. 2 shows an example of a perforated iron plate used in the second invention and an example in which the perforated iron plate is placed on cover concrete at the top of a column, and (a) is a vertical sectional view of the perforated iron plate,
(B) is a plan view of the stigma, (c) is a vertical sectional view of the stigma,
It is.

As shown in FIG. 2 (a) as a metal object,
For example, a punch is used, and a perforated iron plate 10 in which a large number of holes are perforated in a manner to cause a return is used. This perforated iron plate 10 is placed on the cover concrete 9 at the top of the column immediately after placing, as shown in FIGS. 2 (b) and 2 (c). On this occasion,
A mold 14 is provided around the perforated iron plate 10. A vibrator is placed on the perforated iron plate 10, and the perforated iron plate 10 is pushed into the concrete 9 while applying vibration. The perforated iron plate 10 enters the cover concrete 9 by the return 11 and adheres thereto. At the same time, the cover concrete 9 is compacted and becomes solid, and excess water overflows from the holes 12. A rust preventive paint is applied to the surface of the perforated iron plate 10 for rust prevention.
The formwork 14 is for preventing the surrounding concrete from rising up when the perforated iron plate 10 is pushed in by vibration.

[0016]

EFFECTS OF THE INVENTION Since the cover concrete on the top of the column is reinforced and strengthened, the adhesion strength of the upper beam main bar to the concrete at the anchoring portion of the top floor column head becomes high, and the anchoring property of the upper beam main bar penetrating inside the column is improved. Is significantly improved, and it is possible to reduce the number of bars that are bent into the columns and arranged. As a result, the congestion of the reinforcing bars in the panel zone is alleviated, the filling of the concrete is also improved, and there is no need to unnecessarily enlarge the beam and column sections.

[Brief description of the drawings]

1 shows an example of a wire mesh with legs and an example in which the wire mesh with legs is installed in the panel zone of the uppermost column head, (a) is a perspective view of the wire mesh with legs, (b) is an elevation of the wire mesh with legs Figure,
(C) is a plan view of the panel zone, and (d) is a longitudinal sectional view of the panel zone.

2A and 2B show an example of a perforated iron plate and an example in which the perforated iron plate is placed on cover concrete at the top of a column, where (a) is a vertical sectional view of the perforated iron plate and (b) is a plan view of the column head. ,
(C) is a longitudinal cross-sectional view of the stigma.

[Explanation of symbols]

1 ... Reinforcing bar, 2. Leg, 3 ... Wire mesh with leg, 4 ... Top beam main bar, 5 ... Bottom beam bar, 6 ... Orthogonal top beam bar, 7 ... Orthogonal bottom beam bar, 8 ..Column reinforcement, 9..cover concrete, 10..perforated iron plate, 11..return, 12..hole, 14..form

Claims (2)

(57) [Claims] 1. Placing concrete in a state in which a wire mesh with legs, in which deformed bars are welded as legs, is installed at each intersection point of a grid-shaped wire mesh welded with reinforcing bars and is installed on the main bar of the upper beam in the panel zone of the top head of the uppermost floor. After that, the method of reinforcing the top floor column head of a reinforced concrete structure is characterized in that it is compacted during the hardening process of the concrete. 2. A perforated iron plate having a large number of holes in a form that causes a return is placed on the concrete surface at the time of compacting the concrete placed on the top of the uppermost pillar, and the perforated iron plate is attached. Reinforcement method for the top floor column head made of reinforced concrete, characterized by pushing it into the concrete surface while applying vibration.