JPH09256391A - Earthquake resistant reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that is effective to the earthquake resistant reinforcement of an existing building in particular and capable of executing reinforcing work without any special work on the building itself while using the building and upgrading effectively earthquake resistant strength. SOLUTION: In an earthquake resistant reinforcing structure of a building 2 erected on the ground 11, an underground continuous wall 5 is constructed so as to envelop the surrounding area around the ground 1A directly under the building 2 while a cushioning material 7 is laid out on an interior wall surface, thereby breaking off the relationship between the ground 1A directly under the building 2 and the surrounding ground 1B. Only the vertical load of the building 2 is supported on an underground pile 4 driven into its support layer 3 below the building so that the ground 1A directly under the building 2 may function as a damping layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic strengthening structure effective for seismic strengthening of an existing building, and more particularly to a seismic strengthening structure capable of performing a reinforcing work while using a building.

[0002]

2. Description of the Related Art As a seismic retrofit for an existing building, it is generally practiced to wind a steel plate around a pillar or a beam or to install a seismic wall inside an opening surrounded by the pillar and the beam.

[0003]

However, when an existing building is subjected to seismic reinforcement, there is a case where a request for reinforcement work while using the building is issued. In such a case, as in the conventional case, a pillar or The method of seismic retrofitting, such as winding a steel plate around a beam or installing an earthquake resistant wall in the opening surrounded by columns and beams, requires construction inside the building, which is an obstacle to satisfying the requirements.

In consideration of the above-mentioned circumstances, the present invention is particularly effective for seismic retrofitting of an existing building, and it is possible to carry out the reinforcing work while using the building without performing any special work on the building itself, and moreover, it is effective. It is an object of the present invention to provide a seismic strengthening structure capable of increasing the general seismic strength.

[0005]

According to a first aspect of the present invention, in an earthquake-proof reinforcing structure for a building erected on the ground, an underground continuous wall is constructed so as to surround the ground immediately below the building, By arranging a cushion material on the wall surface of the continuous underground wall, the ground immediately below the building and the ground around it are cut off.

The invention of claim 2 is characterized in that, in claim 1, the building is supported only by a vertical load by an underground pile driven into the lower support layer.

According to a third aspect of the present invention, in the first or second aspect, the cushion material is arranged on the inner wall surface of the underground continuous wall, and the underground continuous wall is fixed to the ground around it by an earth anchor. Characterize.

[0008]

Embodiments of the present invention will be described below 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. This building 2 is supported only by its vertical load by underground piles 4 driven into the support layer 3 below the surface ground 1.

[0009] In the seismic retrofitting of such an existing building 2, here, an underground continuous wall 5 is constructed so as to surround the ground 1A immediately below the building 2. Then, on the inner wall surface of this underground continuous wall 5, a rubber tube (underground continuous wall 5
A cushioning material 7 such as a tubular shape) is attached to the ground 1A immediately below the building 2 and the ground 1B around the ground 1A in a vibrating mechanical manner. The underground continuous wall 5 is fixed to the surrounding ground 1B by an earth anchor 6 that is driven obliquely to prevent it from falling.

Next, the operation will be described. In this way, in the structure in which the underground continuous wall 5 in which the cushioning material 7 is arranged on the inner wall surface is constructed around the existing building 2 and the ground 1A immediately below the building 2 is cut off from the surrounding ground 1B, in the event of an earthquake The input seismic motion of 1 is transmitted only from the ground 1A immediately below the building 2, and hardly transmitted from the ground 1B around (outside) the underground continuous wall 5. Further, since the ground 1A directly under the building 2 is cut off from the surroundings and the building 2 is supported only by the vertical load by the underground pile 6, the ground 1A directly under the building 2 effectively functions as a damping layer. And the seismic isolation effect comes to be exhibited. Therefore, the input seismic energy to the building 2 is reduced due to the reduction of the horizontal input seismic motion and the seismic isolation effect, and as a result, the seismic strength of the building 2 is increased.

Since the cushioning material 7 is for effectively edging the ground 1A immediately below the building 2 and the ground 1B around it, vibrodynamically, it is provided on the outer wall surface of the underground continuous wall 7. May be. Further, as the cushion material 7, a material other than rubber may be used.

[0012]

As described above, according to the first aspect of the present invention, the underground continuous wall having the cushion material arranged on the wall surface is
By constructing around the building, the ground directly under the building was cut off from the surrounding ground, so the input ground motion at the time of an earthquake is transmitted only from the ground directly under the building, and the ground around the outer continuous wall (outside) Is hardly transmitted from.
Also, since the ground directly below the building is cut off from the surroundings, it will act as a damping layer,
Seismic isolation effect can also be expected. Therefore, the input seismic energy to the building can be reduced by the reduction of the input seismic motion in the horizontal direction and the seismic isolation effect, and the seismic strength can be increased. In particular, according to the present invention, since the underground continuous wall in which the cushion material is arranged is only constructed around the building, it is possible to perform the reinforcement work while using the building without performing any special work on the existing building itself. .

In this case, according to the second aspect of the invention, since only the vertical load of the building is supported by the underground pile driven into the support layer below the building, it is supported via the underground pile during an earthquake. Only the ground motion in the vertical direction is transmitted from the layer to the building, and the ground directly below the building can be effectively functioned as a damping layer to further reduce the input ground motion to the building.

Further, in the invention of claim 3, since the cushioning material is arranged on the inner wall surface of the underground continuous wall, and the underground continuous wall is fixed to the ground around it by the earth anchor, the underground continuous wall. Can be prevented from falling, and the edge cut state between the ground immediately below the building and the surrounding ground can be stably maintained. Therefore, the input earthquake motion from the surrounding ground to the building can be stably reduced over a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Ground 1A Ground directly under the building 1B Ground around 2 Building 3 Support layer 4 Underground pile 5 Underground continuous wall 6 Earth anchor 7 Cushion material

Claims (3)

[Claims] 1. A seismic retrofit structure for a building erected on the ground, wherein an underground continuous wall is constructed so as to surround the ground immediately below the building, and a cushioning material is provided on the wall surface of the underground continuous wall. By doing so, the ground immediately below the building and the ground around it have been cut off to create a seismic retrofit structure. 2. The seismic retrofit structure according to claim 1, wherein the building is supported only by a vertical load by an underground pile driven into a lower support layer. 3. The seismic resistance according to claim 1, wherein a cushioning material is arranged on the inner wall surface of the underground continuous wall, and the underground continuous wall is fixed to the surrounding ground by an earth anchor. Reinforced structure.