JP2000073582A - Base isolating construction method for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolating construction method suitably applicable to an existing building having a restriction on securing a base isolation clearance. SOLUTION: When an adjacent building B is existent contiguous to a base- isolation objective building A, a base-isolation clearance S is secured between the adjacent building B and the base-isolation objective building A by dismantling and removing a part B1 of the adjacent building. When base isolation is carried out for the high storied part of the existing building in which a low storied part and the high storied part are integrally provided, a part of the low storied part is dismantled and removed at its connecting part with the high storied part, so that the low storied part is divided from the high storied part in the horizontal direction for securing the base-isolation space S therebetween. The divided low storied part and the high storied part are connected by a connecting corridor provided with an expansion joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for seismic isolation of an existing building.

[0002]

2. Description of the Related Art In recent years, seismic isolation for improving the earthquake resistance of existing buildings has been performed. The most basic and most common method of seismic isolation of existing buildings is to install a seismic isolation pit in the foundation and install seismic isolation devices such as laminated rubber.

[0003] When an existing building is made seismic isolated, a so-called seismic isolation clearance is required around the building because it is necessary to provide a seismic isolation pit overhanging the building. There is no problem if such seismic clearance is secured around the target building, but if not, securing the seismic isolation clearance is the first decision.

For example, as shown in FIG. 3 (a), if there is an adjacent building B adjacent to the target building A to be seismically isolated, and it is not possible to secure a seismic isolation between them as it is, The target building A as shown in FIG.
(Or adjacent building B) to secure the required seismic isolation clearance S between them, and then seismic isolation pit 1
And the seismic isolation device 2 was installed.

[0005] Further, as shown in FIG.
In an existing building C in which the low-rise part C2 and the low-rise part C2 are integrated, a case where the high-rise part C1 is subjected to seismic isolation is also assumed. In that case, it is difficult to secure the seismic isolation clearance around the entire high-rise part C1, and as shown in FIG.
And the lower part C12, and the seismic isolation device 2 is installed between them, so that only the upper part C11 is isolated.

[0006]

However, as shown in Fig. 3, it is premised that there is enough space on the site to perform the pulling for seismic isolation, and more than the construction for seismic isolation. In addition, the pulling house itself may be extremely large-scale construction, and it is impractical, especially when the target building has a basement floor, because the pulling house is difficult.

[0007] As shown in FIG.
By separating the upper part C11 only by seismic isolation, not only the seismic isolation effect of the lower part C12 is not obtained, but also seismic reinforcement work on the lower part C11 may be necessary. It is indispensable to carry out a refurbishment due to the division of various flow lines (elevators, stairs, equipment-related shafts, etc.) in the vertical direction in the high-rise section C1.

[0008] The present invention provides a seismic isolation method suitable for application to existing buildings that are restricted in securing seismic isolation clearance as described above.

[0009]

The invention according to claim 1 is a seismic isolation method applied to a case where an adjacent building is adjacent to an existing building to be seismically isolated, and a part of the adjacent building. Is dismantled and removed to secure a clearance between the adjacent building and the building subject to seismic isolation.

[0010] The invention of claim 2 is a seismic isolation method applied to seismic isolation of a high-rise part of an existing building in which a low-rise part and a high-rise part are integrally provided, wherein the low-rise part is provided. Is disassembled and removed at the connecting portion with the high-rise portion, thereby separating the low-rise portion and the high-rise portion in the horizontal direction to secure the seismic isolation clearance therebetween.

According to a third aspect of the present invention, in the second aspect, the divided low-rise section and high-rise section are connected to each other by a crossing corridor having an expansion joint.

[0012]

FIG. 1 shows a first embodiment of the present invention. As shown in FIG. 1A, the first embodiment is applied to a case where there is an adjacent building B close to a building A to be seismically isolated and a seismic isolation clearance cannot be secured as it is. Then, by dismantling and removing a part B1 of the adjacent building B on the side of the target building A, the seismic isolation clearance S is secured there.
And the seismic isolation device 2 is installed.
When the target building A has a basement floor, only the ground floor may be seismically isolated using the lowest layer above the ground as a seismic isolation layer.

In this case, the dismantling and removal of the adjacent building B may be limited to the minimum necessary for securing the seismic isolation clearance S. In that case, if necessary, reinforcement such as newly installing a pillar may be performed. Alternatively, if one span of the adjacent building B is dismantled and removed, only a new outer wall is required and no additional reinforcement is required.

According to the first embodiment, it is possible to secure the seismic isolation clearance S without using a tug as in the conventional case, and therefore, much more easily than in the conventional case. Even if A has a basement floor where it is difficult to perform the pulling, it can be applied without any trouble.

FIG. 2 shows a second embodiment of the present invention. As shown in FIG. 2A, the second embodiment is applied to an existing building C in which a high-rise section C1 and a low-rise section C2 are integrally provided, and which is to be subjected to seismic isolation for the high-rise section C1. By disassembling and removing a part C21 of the low-rise part C2 at a connection part with the high-rise part C1, the low-rise part C2 and the high-rise part C1 are horizontally separated, and the seismic isolation clearance is provided therebetween. S is secured, and after that, a seismic isolation pit 1 is provided at the base of the high-rise part C1, and a seismic isolation device 2 is installed. When the high-rise part C1 has a basement floor, the lowermost part of the high-rise part C1 above the ground may be used as the base-isolation layer, and only the ground-rise floor may be isolated.

In this case as well, the range of disassembly and removal of the low-rise section C2 may be reduced to a minimum necessary for securing the seismic isolation clearance S, and reinforcement may be performed by, for example, newly installing columns as necessary. If one span of the C1 side is dismantled and removed, reinforcement can be reduced. Then, if necessary, if the divided low-rise section C2 and high-rise section C1 are connected by a crossing corridor provided with an expansion joint, the integrity and the usability of the whole building C are not impaired.

According to the second embodiment, it is possible to realize seismic isolation of the entire high-rise part, which has been difficult in the past, and it is applicable without problem even when the high-rise part has a basement floor.

[0018]

As described above, according to the first aspect of the present invention, a part of an adjacent building is dismantled and removed to secure the seismic isolation clearance there. Therefore, the seismic isolation clearance can be secured much more easily than in the past, and it can be applied without difficulty even when the site has no room or when the target building has a basement floor.

According to the second aspect of the present invention, when the high-rise part is made seismic-isolated, a part of the low-rise part is dismantled and removed to divide them horizontally to secure the seismic isolation clearance between them. In addition, it is possible to realize seismic isolation of the entire high-rise part, which has been difficult in the past.

According to the third aspect of the present invention, the divided low-rise section and high-rise section are connected to each other by a connecting corridor having an expansion joint, so that the integrity and the usability of the whole building are not impaired.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing an example of a conventional seismic isolation method.

FIG. 4 is a view showing another example of the conventional seismic isolation method.

[Explanation of symbols]

 S Seismic isolation clearance A Building subject to seismic isolation B Adjacent building C1 High section C2 Low section

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Haruhisa Inoue 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F-term (reference) 2E176 AA01 BB28 BB36

Claims (3)

[Claims] 1. A seismic isolation method applied when an adjacent building is adjacent to an existing building to be seismically isolated, wherein a part of the adjacent building is dismantled and removed. A seismic isolation method for existing buildings, which secures seismic isolation clearance between the building and the target building. 2. A seismic isolation method applied to seismic isolation of a high-rise part of an existing building in which a low-rise part and a high-rise part are integrally provided, wherein a part of the low-rise part is provided. A seismic isolation method for an existing building, characterized by dismantling and removing the high-rise part at the junction with the high-rise part, thereby separating the low-rise part and the high-rise part in the horizontal direction and securing seismic isolation clearance between them. 3. The method for seismic isolation of an existing building according to claim 2, wherein the divided low-rise section and high-rise section are connected by a crossing corridor provided with an expansion joint.