JPH08189085A - Construction method of boundary beam with earthquake resistant damper in reinforced concrete core wall frame - Google Patents

Abstract

PURPOSE: To make the fitting of boundary beams to a core wall easy in construction and structurally advantageous. CONSTITUTION: At the time of constructing a core wall, fixtures 3 are disposed at the boundary beam fitting parts of the core wall 1 in such a state that the fixed parts are exposed to the surface of the fitting parts. Boundary beams 2 are formed of steel, and fixtures 4 are fitted to the fitting ends of the boundary beams 2. The fixtures 4 of the boundary beams 2 are connected to the fixtures 3 of the core wall 1 to integrate the boundary beams 2 with the core wall 1. The boundary beam 2 is divided at the center part and integrated through a damper 10. With this construction method, the boundary beam 2 made of hollow steel with the damper 10 inserted at the center part can be used for the fixture 3 of the core wall 1 and the fixture 4 of the boundary beam 2. This results in obtaining the boundary beams 2 having shearing yield strength and tenacity at the time of an earthquake so that earthquake force reducing effect can be expected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on an RC core wall frame structure in a building adopting a tube structure,
The present invention relates to a method of constructing a boundary beam that enables a core wall to bear a stress during an earthquake and the like, and can be expected to have a seismic force reduction effect that suppresses the shaking of a building during an earthquake.

[0002]

2. Description of the Related Art In a building having a tube structure, etc., when the core wall frame is constructed by RC construction, the core wall has a larger bending deformation as the building becomes higher. Therefore, stress such as seismic force cannot be applied to the core wall. Therefore, conventionally, as shown in FIG. 3, a boundary beam 21 is provided at the time of forming the core wall 20 to deal with the problem. That is, the structure of the core wall 20 is changed to the building by the bending back effect of the boundary beam 21.
Even the upper part of 22 is supposed to be able to bear the stress such as seismic force.

[0003]

However, the boundary beam produced by the conventional general construction method tends to have a large cross-section in order to cope with a very large stress received during an earthquake or the like. In particular, when this boundary beam is formed by RC construction, it tends to be complicated in terms of construction, such as adopting X-shaped bar arrangement in order to increase shear strength. As described above, the boundary beam according to the conventional construction method tends to be large, and the construction tends to be complicated, which is expensive.

The present invention was devised in view of the above-mentioned circumstances, and an object thereof is to make it easy to install the boundary beam on the core wall in terms of construction and to make it structurally advantageous.
It is to provide a method for constructing a boundary beam that incorporates a vibration control damper in a C core wall frame structure.

[0005]

According to the boundary beam construction method of the present invention, when the core wall is constructed, the fixing metal fitting is exposed at the boundary beam mounting portion of the core wall on the surface of the mounting portion. The boundary beam is made of steel, and the fixing metal fitting is attached to the attachment end of the boundary beam. Then, the core wall and the boundary beam are integrated by connecting the fixing member for the boundary beam and the fixing member for the core wall. Further, the boundary beam is divided at the central part, and the divided mutual boundary beams are connected and integrated by a damper for damping.

According to the construction method of the present invention as described above, since the boundary beam made of the steel frame can be used by the fixing member for fixing the core wall and the fixing member for fixing the boundary beam, there is shearing force, and when the earthquake occurs, It can be a boundary beam that is tenacious and can withstand stress such as during an earthquake. As a result, the cross-section of the boundary beam can be made small, and X-shaped bar arrangement is not necessary, so that the difficulty of the reinforcing bar construction can be eliminated.

Further, the damper installed at the center of the boundary beam reduces the seismic force entering the building at the time of a large earthquake and improves the structural performance of the entire building.

Further, the core wall can be formed in advance by the slip forming method and the sliding method, and the boundary beam can be attached later. As a result, it is possible to save the trouble of removing the box from the opening.

[0009]

EXAMPLE A method of constructing a boundary beam incorporating a vibration control damper in an RC core wall frame structure of the present invention will be described below with reference to the illustrated example.

The boundary beam construction method (see FIG. 1) that is attached to the RC core wall frame structure (see FIG. 1 (b)) in a tube structure or the like to reinforce the stress of the core wall is as follows. At the time of constructing, the fixing metal fitting 3 is arranged on the mounting portion of the boundary beam 2 on the core wall 1 with the fixing portion exposed on the surface of the mounting portion. On the other hand, the boundary beam 2 is made of steel, and the fixing metal fitting 4 is attached to the attachment end of the boundary beam 2. Then, the fixing metal fitting 4 of the boundary beam 2 and the fixing metal fitting 3 of the core wall 1 are connected to each other to integrate the core wall 1 and the boundary beam 2.

The fixing metal fitting 3 arranged at the boundary beam mounting portion of the core wall 1 in this embodiment is shown in FIG.
As shown in FIG. 5, an anchor bolt 5 is provided on the back surface, and is composed of a mounting steel plate 6 arranged with the front surface exposed. Further, the fixing metal fitting 4 attached to the attachment end of the boundary beam 2 is composed of an attachment base plate 7. Then, the mounting base plate 7 of the boundary beam 2 is
By facing the surface of the mounting steel plate 6 of the core wall 1 and welding the base plate 7 and the steel plate 6, the core wall 1
And the boundary beam 2 are integrated.

The boundary beam 2 connected to the core wall 1 is
As shown in FIG. 1 (a), it is divided into two parts, and a damper 10 is interposed in the divided part. The dampers 10 are connected and integrated.

FIG. 2 shows another mode of the fixing metal fitting. The fixing metal fitting 3 arranged at the boundary beam mounting portion of the core wall 1 is composed of an anchor bolt 8 arranged so that the tip surface of the tip portion 8a having a female screw is exposed. There is. Further, the fixing metal fitting 4 attached to the attachment end of the boundary beam 2 is composed of an attachment base plate 7. Then, the mounting base plate 7 of the boundary beam 2 is brought into contact with the tip surface of the anchor bolt 8 of the core wall 1, and the fixing bolt 9 penetrating the base plate 7 is screwed into the female screw (tip portion 8a) of the anchor bolt 8. By doing so, the core wall 1 and the boundary beam 2 are integrated.

By attaching the boundary beam 2 to the core wall 1 by the construction method of the present invention as described above, it is possible to obtain the boundary beam 2 which has shear strength and is tenacious at the time of an earthquake, and the seismic force of the damper 10 can be obtained. A reduction effect can be expected. This is because the boundary beam 2 is where stress is concentrated and is optimal as the installation position of the damper.

Further, the core wall 1 can be formed in advance by the slip-form construction method and the sliding construction method, and the boundary beam 2 can be attached later. Therefore, it is possible to save the trouble of removing the box from the opening. Further, it is possible to provide the boundary beam 2 that has shear strength and is tenacious at the time of an earthquake and can be expected to have an effect of reducing seismic force.

[0016]

EFFECT OF THE INVENTION According to the construction method of the present invention, since the boundary beam made of steel frame can be used by the fixing member for fixing the core wall and the fixing member for fixing the boundary beam, there is shear resistance,
It can be a boundary beam that is tenacious during an earthquake and can be expected to reduce the seismic force. Therefore, the cross-section of the boundary beam can be made small, and X-shaped bar arrangement is not necessary, so that the difficulty of the reinforcing bar construction can be eliminated.

Further, the core wall can be formed in advance by the slip-form construction method and the sliding construction method, and the boundary beam can be attached later. As a result, it is possible to save the trouble of removing the box from the opening.

[Brief description of drawings]

FIG. 1 (a) is an enlarged schematic view of part A of FIG. 1 (b) showing a boundary beam attached by the method of constructing the boundary beam in the RC core wall structure of the present invention, and (b) uses the boundary beam. It is a schematic diagram showing a building.

FIG. 2 is a partially enlarged schematic view showing another embodiment of a fixing bracket for mounting a boundary beam in the construction method of the present invention.

3A is a schematic view showing a core wall in a building having a general tube structure, and FIG. 3B is a sectional view taken along line BB of FIG. 3A.

[Explanation of symbols]

1 ... Core wall, 2 ... Boundary beam, 3 ... Fixing metal fitting, 4 ... Fixing metal fitting, 5 ... Anchor bolt, 6 ... Mounting steel plate, 7 ... Mounting base plate, 8 ... Anchor bolt, 8a ... Tip part, 9 … Fixing bolts, 10… Dampers.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Suzuki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Motomi Takahashi 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A method of constructing a boundary beam, which is attached to an RC core wall frame structure in a building having a tube structure to reinforce the stress of the core wall, wherein the boundary beam in the core wall is constructed when the core wall is constructed. The fixing metal fitting is arranged in the mounting part of the fixing part so that the fixing part is exposed on the surface of the mounting part, while the boundary beam is made of a steel frame, and the fixing metal fitting is attached to the mounting end of the boundary beam. Mounting, the core wall and the boundary beam are integrated by connecting the fixing bracket for the boundary beam and the fixing bracket for the core wall, and the boundary beam to be attached to the core wall is divided into two parts. A method of constructing a boundary beam that incorporates a vibration control damper in an RC core wall frame structure, characterized in that a damper is interposed in the section and is connected and integrated by this damper.