JP3733490B2 - Seismic reinforcement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcement structure effective for seismic reinforcement of an existing building, and more particularly to a seismic reinforcement structure capable of a reinforcement work while using a building.
[0002]
[Prior art]
As for seismic reinforcement of existing buildings, it is common practice to wind steel plates around columns and beams, or to install seismic walls in openings surrounded by columns and beams.
[0003]
[Problems to be solved by the invention]
However, when an existing building is seismically reinforced, there is a case where a request for reinforcement work is made while using the building. In such a case, as in the conventional case, an iron plate is wound around the column or beam, The method of seismic reinforcement, such as installing a seismic wall in the opening surrounded by the beams, requires work inside the building, which hinders satisfying the requirements.
[0004]
In consideration of the above circumstances, the present invention is particularly effective for seismic reinforcement of an existing building, and can be reinforced while using the building without performing special construction on the building itself. An object is to provide a seismic reinforcement structure capable of increasing strength.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, in the seismic reinforcement structure of a building erected on the ground, an underground continuous wall is constructed so as to surround the periphery of the ground directly below the building, and a cushion material is provided on the wall of the underground continuous wall. by disposing, is ground and edge cutting and the ground surrounding the right under the building, the building, the input ground motion from the ground around the diaphragm wall is not transmitted, further, the building, the support of the lower It consists of a structure in which only vertical loads are supported by underground piles driven into the layer, and only vertical input ground motion is transmitted from the support layer to the building via the underground pile, and the ground directly under the building is It functions effectively as an attenuation layer.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a vertical cross-sectional view showing the seismic reinforcement structure of the embodiment.
An existing building 2 is erected on the ground 1. Only the vertical load of this building 2 is supported by an underground pile 4 driven into a support layer 3 below the surface ground 1.
[0009]
In order to seismically reinforce such an existing building 2, here, the underground continuous wall 5 is constructed so as to surround the ground 1 </ b> A immediately below the building 2. And, by attaching a cushion material 7 such as a rubber tube (arranged in a cylindrical shape around the entire circumference of the underground continuous wall 5) to the inner wall surface of the underground continuous wall 5, the ground 1A immediately below the building 2; The surrounding ground 1B is vibrated mechanically. Moreover, the underground continuous wall 5 is fixed by a ground anchor 6 which is driven obliquely with respect to the surrounding ground 1B to prevent the fall.
[0010]
Next, the operation will be described.
As described above, in the structure in which the underground continuous wall 5 in which the cushion material 7 is disposed on the inner wall surface is constructed around the existing building 2 and the ground 1A immediately below the building 2 is separated from the surrounding ground 1B, Is transmitted only from the ground 1A immediately below the building 2 and is hardly transmitted from the ground 1B around (outside) the underground continuous wall 5. In addition, since the ground 1A immediately below the building 2 is cut off from the surroundings, and the building 2 is supported by the underground pile 6 only for the vertical load, the ground 1A immediately below the building 2 functions effectively as an attenuation layer. It becomes a seismic isolation effect. Therefore, the input seismic energy to the building 2 is reduced by the reduction of the horizontal input seismic motion and the seismic isolation effect. As a result, the seismic strength of the building 2 is increased.
[0011]
In addition, since the cushioning material 7 is for effectively cutting off the ground 1A immediately below the building 2 and the surrounding ground 1B in terms of vibration dynamics, it may be provided on the outer wall surface of the underground continuous wall 7. . Further, as the cushion material 7, a material other than rubber may be used.
[0012]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the underground continuous wall having the cushion material disposed on the wall surface is constructed around the building, the ground directly under the building is cut off from the surrounding ground. In the event of an earthquake, the input ground motion is transmitted only from the ground directly under the building, and is hardly transmitted from the ground around the continuous underground wall (outside). In addition, since the ground directly under the building is cut off from the surroundings, it acts as an attenuation layer, so a seismic isolation effect can also be expected. Therefore, the input seismic energy to the building can be reduced by the reduction of the horizontal input seismic motion and the seismic isolation effect, and the seismic strength can be increased. In particular, according to the present invention, since a continuous underground wall with a cushioning material is only constructed around the building, it is possible to perform reinforcement work while using the building without performing any special work on the existing building itself. .
[0013]
In addition, only the vertical load of the building is supported by the underground pile driven into the support layer below the building, and the ground directly under the building functions effectively as a damping layer. Only the vertical ground motion is transmitted from the support layer to the building, and the input ground motion to the building can be further effectively reduced.
[0014]
In addition , by placing cushioning material on the inner wall of the underground continuous wall and fixing the underground continuous wall to the surrounding ground with earth anchors, it is possible to prevent the underground continuous wall from falling, and directly below the building. The edge cutting state between the ground and the surrounding ground can be stably maintained. Therefore, the input ground motion from the surrounding ground to the building can be stably reduced over a long period of time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration of an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 1A Ground directly under a building 1B Surrounding ground 2 Building 3 Support layer 4 Underground pile 5 Underground continuous wall 6 Earth anchor 7 Cushion material

Claims (1)

In the seismic reinforcement structure of buildings standing on the ground,
By constructing an underground continuous wall so as to surround the ground directly below the building, and by arranging a cushion material on the wall of the underground continuous wall, the ground directly below the building and the surrounding ground are cut off, Input earthquake motion is not transmitted from the ground around the underground continuous wall to the building,
Furthermore, the building consists configuration supported only vertical load by ground stakes driven into the support layer below,
An earthquake-resistant reinforcement structure characterized in that only the input ground motion in the vertical direction is transmitted from the support layer to the building through the underground pile, and the ground directly under the building functions effectively as a damping layer.

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