JPH09221918A - Reinforcing construction for existing reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily enhance the earthquake resistance by contacting steel plates the surface of the members of an existing reinforced concrete structure and then making the steel plates and reinforced concrete members in one united body by using post- working anchors. SOLUTION: When reinforcing the vicinity of an RC column 1 and both the surfaces of a wing wall 3 extending from its both the surfaces to a space between an RC beams 2, for example, steel plates 5 are arranged in the vicinity of tone column 1, and steel plates 6 are arranged on both the surfaces of a wall 3. Next, post-working anchors such as bolts are inserted into many holes drilled in the steel plates 5 and 6 and tightened with nuts 8 thereby making the column 1, wall 3 and steel plates 5 and 6 in one united body. Next, in this case, the steel plates 5 and 6 are produced in a factory, a place corresponding to an opening 4 of the wall 3 is cut off to the same shape and also is subdivided into a size suited to carrying operation if it is necessary to carry the steel plates to the inside of the building. By doing this, columns and bearing walls can be easily reinforced, non-bearing walls can be upgraded to bearing walls thereby improving the earthquake resistance, the above can be easily applied even to irregular structural bodies, and the work can be carried out in a short construction period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for improving the seismic resistance of a frame in an existing reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, in an existing reinforced concrete (hereinafter abbreviated as RC) building, as a structure to reinforce a frame having insufficient bearing capacity against a large earthquake, for example, concrete is added to a wall or a pillar. Then, a structure for increasing the yield strength of the body is often used. In order to reinforce the existing RC column to improve the proof strength of the skeleton, a steel plate is surrounded by a gap around the RC column, and mortar is injected into the gap between the steel plate and the column for integration. By doing so, a structure is known in which the proof stress of the body is enhanced.
Further, as a structure for reinforcing the existing RC structure itself, a plurality of structural steel plates that also serve as molds are arranged along the wall, and adjacent steel plates are steel bars or shapes that also serve as a large number of shear members. There is a thick wall body that is excellent in earthquake resistance by connecting with a space maintaining member such as steel and by pouring concrete between the steel plate and the wall.

[0003]

However, among the conventional reinforcing structures of these existing RC structures, RC walls and RC
In the case of concrete overfilling the pillar,
Since the construction of cast-in-place concrete is required, the construction period becomes long, and there is a problem that the building cannot be used during that period, and there is a drawback that the workability is extremely poor especially inside the building. Further, regarding the reinforcing structure in which steel plates are integrated by interposing mortar or concrete on the RC columns or RC walls, it takes a lot of time to weld the steel plates to each other or inject mortar and the like, and perform various curing work around them. However, there was a problem that the workability was inferior due to the additional work required. In addition, any of the reinforcing structures has a problem that it is difficult to apply it as it is to an RC frame having an irregular shape such as a sleeve wall or a waist wall.

The present invention has been made in order to effectively solve the problem of the conventional reinforcing structure for the existing RC structure, and is easy to construct and requires only a short construction period.
To provide a reinforcing structure for an existing RC structure, which can be easily applied to an RC body having an irregular shape such as an opening wall and can easily improve the proof stress of various existing RC structures. The purpose is.

[0005]

A reinforcing structure for an existing RC structure according to the present invention as set forth in claim 1, wherein a steel plate is brought into contact with a surface of a member constituting an existing RC structure, and a post-installed anchor is used. The steel plate and the member are integrated with each other. Here, the invention according to claim 2 is characterized in that the member is a bearing wall, a pillar, or a non-bearing wall of the existing RC structure.

According to the reinforcing structure of the existing RC structure described in claim 1, the steel plate is processed and manufactured in advance in a factory or the like, and is assembled on site to be integrated with the surface of the wall or column to be reinforced. Since the structure of the existing RC structure can be reinforced only by changing the structure, it does not require concrete pouring, welding work, and large-scale curing work at the site unlike the conventional ones, so that it is easy and extremely easy. Construction can be done in a short construction period. At this time, since the weight and size of each steel plate can be appropriately reduced, the steel plates can be easily carried into the building or the upper floor.

Further, since the steel plate is directly integrated with the pillar or wall through the post-installation anchor, it is possible to freely reinforce the steel plate by avoiding the opening and the like by processing the steel plate into appropriate dimensions. Therefore, it can be easily applied to reinforcing various irregularly shaped concrete frames having a waist wall, a hanging wall, an opening wall, and the like. As the post-installed anchor, tacks, bolts, chemical anchors or the like can be applied. Therefore, the invention according to claim 1 can be applied to reinforcement of columns and load-bearing walls constituting the skeleton of an existing RC structure having insufficient load-bearing strength, as in the invention according to claim 2. It is also possible to reinforce the non-bearing wall to function as a bearing wall, and as a result, various existing RC structures can be easily revived into a seismically safe structure.

[0008]

1 to 3 show a first embodiment of a reinforcing structure for an existing RC structure according to the present invention.
This is applied to the case where the periphery of the existing RC column (member) 1 and both sides of the sleeve wall (member) 3 extending between the existing RC beams 2 and 2 from both side surfaces thereof are reinforced. Incidentally, openings 4 and 4 are formed on each side of the sleeve wall 3. FIG.
Further, as shown in FIG. 3, in this reinforcing structure, steel plates 5 are arranged around the RC columns 1 and steel plates 6 are also arranged on both sides of the sleeve wall 3. Here, in the steel plates 5 and 6, a large number of holes are formed all over the surface at substantially equal intervals in the vertical and horizontal directions,
The tacks and bolts (post-installed anchors) 7 erected by post-installation on the surfaces of the RC pillar 1 and the sleeve wall 3 in these holes.
... is inserted. The steel plates 5 and 6 are integrated by bringing the back surface into contact with the front surface of the RC column 1 or the sleeve wall 3 by tightening the nut 8 on the head when the bolt 7 is used. There is.

[0009]

Other Embodiments of the Invention FIGS. 4 and 5 show a second embodiment of a reinforcing structure for an existing RC structure according to the present invention. This reinforced structure is compatible with existing RC columns 1 and R
A structure in which an RC load-bearing wall 10 having an opening 4 is formed between the C-beams 2 and 2, and the load-bearing wall 10 of the structure is reinforced from one side. One side of the RC load-bearing wall 10 avoiding the opening 4 A steel plate 11 is disposed on the. Then, the steel plate 11
In the same manner, a large number of holes are similarly formed all over the surface at substantially equal intervals in the vertical and horizontal directions.
On the surface of the RC bearing wall 10, rivets and bolts (post-installed anchors) 7 erected by post-installation are inserted. Then, the steel plate 11 is integrated by fastening the nut 8 to the head of the bolt 7 so that the back surface of the steel plate 11 contacts the front surface of the RC load bearing wall 10.

Further, FIGS. 6 and 7 show a reinforcement structure of an existing RC structure according to the present invention, in which existing RC columns 1 and RC are used.
It shows the third embodiment applied to the reinforcement of the existing RC bearing wall 15 arranged between the beams 2 and 2. In these drawings, a reinforcing steel plate (steel plate) 16 in which two steel plates are laminated is provided on the entire surface of the RC load-bearing wall 15, and a large number of holes similarly formed on the entire surface thereof. The rivets or bolts (post-construction anchors) 7 that are erected on the RC bearing wall 15 by post-construction are inserted into the respective portions. The reinforcing steel plate 16 is directly attached to the bolt 7 by the studs 7 ...
The bottom surface of the RC bearing wall 15
Is brought into contact with the surface of and integrated.

Next, a method of constructing the reinforcing structure of the existing RC structure shown in FIGS. 1 to 7 will be described. First, in a factory or the like, the steel plates 5, 6, 11 or the reinforcing steel plate 16 are preliminarily cut into a predetermined size, and a large number of holes are formed at predetermined intervals. At this time, the portion corresponding to the opening 4 is cut into the same shape. Further, when it is necessary to carry into the building or the upper floor, the steel plates 5, 6, 11 or the reinforcing steel pipe 16 are divided into sizes suitable for carrying. Then, these steel plates 5 and the like are carried in to the positions of the members 1, 3, 10, 15 to be reinforced, and set on the surface thereof using a known means.

Next, each steel plate 5 or the like or the reinforcing steel plate 16
Using the hole portions, the surface of the member 1 or the like to be reinforced is drilled with a drill or the like. At this time, when a hole-in anchor is used as the post-construction anchor, drilling is unnecessary. Next, the tacks or bolts 7 are driven from the surface side of the member 1 or the like, and when the bolts 7 are used, the nuts 8 are tightened from the surface side of the steel plate 5 or the like to integrate the steel plate 5 or the like with the body. Let

As described above, in the reinforcing structure of the existing RC structure having the above structure, the steel plates 5, 6, 11 are previously prepared.
Alternatively, the existing RC column 1 to be processed and manufactured in the factory or the like of the reinforcing steel plate 16 and to be assembled and reinforced on site
Since the structure of the existing RC structure can be reinforced only by integrating it with the surface of the RC wall 3, 10, 15 or the like, concrete pouring and welding work on site like conventional ones, and even large-scale curing. This eliminates the need for work and the like, so that construction can be performed easily and in an extremely short construction period. Further, at this time, the weight and size of the individual steel plates 5 and the like can be reduced, so that the steel plates can be easily carried into the building or the upper floor.

Further, since the steel plate 5 and the like are directly integrated with the pillars and walls through the bolts 7 and the like, the steel plate 5 and the like are machined to have appropriate dimensions so that the opening 4 can be avoided freely. Therefore, the present invention can be easily applied to the reinforcement of various irregularly shaped concrete frames having a waist wall, a hanging wall, an opening wall, and the like. Therefore, the present invention can be applied to the reinforcement of the RC columns 1 and the bearing walls 10 and 15 constituting the skeleton of the existing RC structure having insufficient bearing capacity, and further, the non-bearing walls can be reinforced to function as bearing walls. , It is possible to easily revive various existing RC structures to a structure that is earthquake-proof and safe.

In the above embodiment, only the case where the tacks or the bolts 7 are used as the post-installed anchors has been described, but the present invention is not limited to this, and various engraving anchors, hole-in anchors, chemical anchors, etc. It is possible to use the well-known post-construction anchor of. Further, with respect to the steel plates 5, 6, 11 as well, various construction methods such as appropriately dividing and stacking adjacent steel plates for anchoring, or connecting them by welding can be applied. Further, in the second and third embodiments, the case where the load bearing walls 10 and 15 of the RC structure are reinforced by using the steel plate 11 or the reinforcing steel plate 16 has been described. 11 or the reinforcing steel plate 16 may be reinforced to function as a bearing wall.

[0016]

As described above, according to the reinforcing structure of the existing RC structure described in claim 1, it is easy to process and manufacture the steel sheet in a factory or the like in advance.
In addition, the construction can be performed in an extremely short construction period, and the weight and size of each steel sheet can be reduced, so that the steel sheet can be easily carried into the building or the upper floor. Further, by processing the above-mentioned steel plate into an appropriate size, it is possible to freely reinforce the steel sheet while avoiding the openings and the like, and thus, various irregular-shaped concrete frames having waist walls, hanging walls, opening walls, etc. It can be easily applied to the reinforcement of. As a result, as in the invention described in claim 2, the present invention can be applied to reinforcement of columns and load-bearing walls that constitute the skeleton of an existing RC structure having insufficient load-bearing capacity, and further, non-bearing-force walls are reinforced to support load-bearing walls. As a result, various existing RC structures can be easily revived into an earthquake-resistant and safe structure.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a reinforcing structure for an existing RC structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view showing another embodiment of the present invention.

FIG. 5 is a side sectional view of FIG. 4;

FIG. 6 is a front view showing another embodiment of the present invention.

FIG. 7 is a side sectional view of FIG.

[Explanation of symbols]

 1 Existing RC column (member) 3 Existing sleeve wall (member) 4 Opening 5, 6, 11 Steel plate 7 Tack, bolt (post-installed anchor) 10, 15 Existing bearing wall (member) 16 Reinforced steel plate (steel plate)

Claims (2)

[Claims] 1. An existing reinforced concrete structure characterized in that a steel plate is brought into contact with a surface of a member constituting an existing reinforced concrete structure, and the steel plate and the member are integrated by a post-installation anchor. Reinforced structure. 2. The reinforcing structure for an existing reinforced concrete structure according to claim 1, wherein the member is a bearing wall, a pillar or a non-bearing wall of the existing reinforced concrete structure.