JP2001115656A - Middle floor base isolation structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a middle floor base isolation structure capable of efficiently utilizing a base isolation layer as a living room and enhancing the freedom of building planning by devising the setting manner of a damper and utilizing the upper surface part of a fixed board constituting the damper as a desk or table. SOLUTION: This middle floor base isolation structure for building comprises a base isolation device set by partially cutting the column of the middle floor of a building and a damper separate from the base isolation device. The damper is formed of a movable board, a fixed board and a slider type damping device sandwiched between the both. The movable board is mounted on the upper structure part including the column upper from the base isolation device, and the fixed board is substantially horizontally set for the column upper from the base isolation device while ensuring a clearance corresponding to at least the maximum deformation in an earthquake and fixed to the lower structure part including the column lower from the base isolation device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for an existing building, but also for a newly-built building, a part of a middle floor column of the building is cut off in order to improve the seismic safety. It is in the technical field of the middle floor seismic isolation structure that is implemented by installing a separate damper from the seismic isolation device, and more specifically, the seismic isolation floor (middle floor) is used as a living room. The present invention relates to a seismic isolation structure for a middle floor of a building in which a damper is appropriately installed.

[0002]

2. Description of the Related Art Technologies for improving the seismic safety of buildings are as follows.
It is roughly divided into three types: seismic isolation structure, seismic reinforcement, and vibration suppression reinforcement.
Among them, seismic isolation structuring technology is particularly noted because of its high seismic resistance improvement effect and the possibility of centralizing the construction area.
For example, Japanese Patent Application Laid-Open Nos.
Various disclosures in JP-A-62271 and the like are known.

In the known invention, a seismic isolation device is installed in an empty space formed by cutting a part of an existing pillar on an intermediate floor of an existing building, and a damper separate from the seismic isolation device is provided. We are trying to make it seismically isolated.

[0004]

However, the seismic isolation structure on the middle floor of a building has the following problems.

[0005] The maximum amount of horizontal deformation during an earthquake is 30 cm or more.
About 50 cm is assumed. Therefore, when providing a "seismic isolation layer" in which a seismic isolation device is installed to a room or the like, it is necessary to take safety measures to prevent a user of the room or the like from entering the horizontal deformation range. As a result, the effective space as a living room or the like is inevitably reduced, and it cannot be said that the space is utilized efficiently.

[0006] The seismic isolation structure in which the seismic isolation device and the damper are installed separately is different from the seismic isolation structure in which the seismic isolation device and the damper are implemented as a single unit. Therefore, there is an advantage that each performance can be freely adjusted and implemented. On the other hand, as shown in FIGS. 7A to 7D, a space such as a living room (seismic isolation layer) is closed by a damper element, and there is a disadvantage that the degree of freedom in building planning is greatly reduced.

Accordingly, an object of the present invention is to devise the installation mode of the damper, and to use the upper surface of the fixed plate constituting the damper for a desk or table, so that the seismic isolation layer can be efficiently used as a living room. In addition, it is an object of the present invention to provide a seismic isolation structure on the middle floor of a building that can enhance the degree of freedom in architectural planning.

[0008]

As a means for solving the problems of the prior art, a seismic isolation structure for a middle floor of a building according to the first aspect of the present invention comprises a part of a pillar on a middle floor of the building. In the seismic isolation structure of a building constructed by installing a seismic isolation device by cutting off the seismic isolation device and providing a damper separate from the seismic isolation device, the damper has a movable plate and a fixed plate that move relative to each other, and A slider-type damping device installed in a sandwich shape between the two, and the movable plate that relatively moves is attached to an upper structural portion including a column above the seismic isolation device. The fixed plate is disposed substantially horizontally with respect to a column above the seismic isolation device while securing at least a clearance corresponding to a maximum deformation amount during an earthquake, and includes a column including a column below the seismic isolation device. Be fixed to the side structure The features.

[0009] The seismic isolation structure for a middle floor of a building according to the invention described in claim 2 is characterized in that the damper described in claim 1 is installed so as to surround a pillar.

According to a third aspect of the invention, there is provided a seismic isolation structure for an intermediate floor of a building, wherein at least one movable plate according to the first aspect is attached to an upper structure portion, and the fixed plate is a sandwich plate having the movable plate. Characterized in that at least two sheets are provided above and below the arrangement.

According to a fourth aspect of the present invention, there is provided an intermediate floor seismic isolation structure for a building, wherein:
It is characterized by being supported at a height suitable for use as a desk or table.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A to 1C show an embodiment of an intermediate floor seismic isolation structure for a building according to the first to fourth aspects of the present invention. This seismic isolation structure in the middle floor, regardless of whether the building is an existing building or a new building, cuts (or separates) a part of the pillar 1 on the middle floor, and installs it in the space. 2 and a damper 3 separate from the seismic isolation device 2
It is preferably implemented mainly when the seismic isolation layer of a building is provided to a living room or the like.

The damper 3 comprises a movable plate 4 which moves relatively.
And a fixed plate 5 and a slider-type damping device 6 installed in a sandwich shape between the two (FIG. 1).
C).

The slider type damping device 6 is firmly joined to the movable plate 4 and the fixed plate 5 by means such as welding or the like, and as shown in FIG. 2C, the movable plate 4 and the fixed plate 5 move relative to each other. Deforms and performs energy absorption (damping operation). In the case of the example shown in the drawing, the movable plate 4 which moves relative to the outer surface 7a of the steel pipe 7 which is filled with mortar or the like on the outer periphery of the column 1 above the seismic isolation device 2 is connected by joining means such as welding. It is mounted almost horizontally. The fixed plate 5 is disposed substantially horizontally with respect to the outer surface 7 a of the steel pipe 7 while sufficiently securing a clearance C corresponding to the maximum deformation amount (interlayer displacement) during an earthquake. The beam 9 is fixed to the floor slab 9a below the seismic isolation device 2 (claim 1). In the present embodiment, as shown in FIG.
The damper 3 is installed so as to surround the column 1 (steel pipe 7) (claim 2).

Incidentally, reference numeral 10 in FIG. 1 denotes a beam reinforcing steel plate installed on a portion of the upper surface of the floor slab 9a to which the support member 8 is fixed. Reference numeral 11 in FIG.
Indicates ribs for maintaining the interval between the upper and lower fixed plates 5. Reference numeral 12 in FIG. 1 denotes a cover member that can be extended and contracted in the horizontal direction for preventing exposure of the movable plate 4 and maintaining safety.

In the above embodiment, the steel pipe 7 is used as an upper structural portion above the seismic isolation device 2 to which the movable plate 4 that moves relatively is attached, but the present invention is not limited to this.
When the steel pipe 7 is not used, the movable plate 4 may be directly attached to the column 1 for implementation. Alternatively, as shown in FIG. 3, the same operation can be performed by forming the movable plate 4 in a substantially L-shaped vertical sectional shape and attaching the movable plate 4 to the upper beam 9.

In the above embodiment, the movable plate 4 that moves relatively
Is attached to the steel pipe 7, and the fixed plate 5 is
Are sandwiched in the form of a sandwich, and a total of two sheets are provided above and below, but are not limited to this. In order to sufficiently exhibit the desired damping performance, a configuration using two movable plates 4 in parallel and three fixed plates 5 in a staggered arrangement with the movable plates 4 may be used. It is also possible to increase the number of sheets to be carried out (claim 3).

Of the two fixed plates 5, the upper surface of the upper fixed plate 5 has a height suitable for a user such as a living room to use as a desk or table, for example, a height of about 80 cm from the floor slab 9a. It is preferable that the support is provided (claim 4).

In the embodiment shown in FIG. 1B, the damper 3
Is installed so as to surround the outer periphery of the column 1, but is not necessarily limited to this. For example, according to the space desired by the user, such as a living room, the damper 3 shown in FIG.
Of the right half or only the left half. In this case, as shown in FIG. 6, the movable plate 1 that moves relatively is placed in a space where the damper 3 is not installed.
A so-called viscous wall type damper 16, which installs the fixed plate 4 and the fixed plate 15 in a vertical position, can be used as a partition wall.

As shown in FIG. 1A, the support member 8 of the fixed plate 5 has a concave cross-sectional shape from the steel pipe 7 provided on the column 1 below the seismic isolation device 2 to the outer edge of the fixed plate 5. Although formed, it is not limited to this form. As long as the structure can sufficiently support the fixed plate 5, it can be implemented in various forms. For example, as shown in FIG. 4, the support member 8 may be embodied in a substantially circular wall shape fixed to the floor, or as shown in FIG. In order to facilitate sitting and desk work, the lower fixed plate 5 may be provided at a position slightly inward from the outer peripheral edge, and may be implemented in a form in which an empty space for a knee is secured.

According to the seismic isolation system for a middle floor of a building having the above structure, when a horizontal displacement occurs due to an earthquake or the like, a deformation operation as shown in FIG. 2 occurs as an example. That is, when a horizontal displacement such as an earthquake occurs, the column 1 (upper structural part) above the seismic isolation device 2 having the movable plate 4 is displaced within the range of the clearance C, but the energy is reduced by the damping action of the damping device 6. Is absorbed and gradually converges to the original position. Therefore, the fixed plate 5 which sufficiently secures the clearance C and is firmly fixed to the lower structural portion (floor slab 9a) below the seismic isolation device 2 causes any relative displacement to a user such as a living room. Absent.

[0022]

According to the seismic isolation structure for an intermediate floor of a building according to the invention as set forth in claims 1 to 4, the fixed plate of the damper has an upper structural portion above the seismic isolation device provided with the movable plate. As a result, at least a clearance is assumed assuming the maximum amount of deformation during an earthquake, and it is firmly fixed to the lower structural part below the seismic isolation device, so any relative displacement occurs for users such as living rooms Therefore, it can be said that safety is sufficiently maintained.

Therefore, the upper surface of the fixed plate 5 can be effectively used as a desk or table for a user in a living room or the like, and the space efficiency of the living room or the like is not reduced as much as possible, and the seismic isolation layer is efficiently used. can do. As a result, the seismic isolation layer of the building, such as a living room, which was a drawback peculiar to the seismic isolation structure of a building in which a seismic isolation device and a damper are installed separately, is not to be blocked by a damper element, and the degree of freedom in building planning is improved Can be.

[Brief description of the drawings]

1A is a cross-sectional view showing a seismic isolation structure for a building according to the present invention, FIG. 1B is a plan view of the same, and FIG. 1C is an enlarged view of an X part of FIG.

2A is a cross-sectional view showing an example of a seismic isolation structure of a building according to the present invention when deformed, FIG. 2B is a plan view of the same, and FIG. 2C is an enlarged view of an X ′ portion of FIG.

FIG. 3 is a sectional view showing another embodiment of the seismic isolation structure of a building according to the present invention.

FIG. 4 is a sectional view showing another embodiment of the seismic isolation structure of a building according to the present invention.

FIG. 5 is a sectional view showing another embodiment of the seismic isolation structure of a building according to the present invention.

FIG. 6 is a sectional view showing another embodiment of the seismic isolation structure of a building according to the present invention.

7A to 7D are simplified diagrams showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column 2 Seismic isolation device 3 Damper 4 Movable plate 5 Fixed plate 6 Damper 7 Steel pipe 8 Support member 9 Beam 9a Floor slab 10 Beam reinforcing steel plate 11 Rib 12 Cover member 14 Movable plate 15 Fixed plate 16 Viscous wall damper

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hideyuki Watanabe 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Kenichi Tokiwa 8--21 Ginza, Chuo-ku, Tokyo No. 1 Takenaka Corporation Tokyo head office F-term (reference) 2E176 AA03 AA04 BB15 BB28 BB29 BB36

Claims (4)

[Claims] A seismic isolation device is installed by removing a part of a pillar on the middle floor of a building and installing a damper separate from the seismic isolation device. The damper is composed of a relatively movable movable plate and a fixed plate, and a slider-type damping device installed in a sandwich shape between the two; and the relatively movable movable plate is provided by the seismic isolation device. The fixed plate is attached to an upper structural part including an upper column, and the fixed plate is substantially horizontal with respect to a column above the seismic isolation device while securing a clearance corresponding to at least a maximum deformation amount during an earthquake. A seismic isolation structure for a middle floor of a building, wherein the seismic isolation structure is arranged and fixed to a lower structure portion including a column below the seismic isolation device. 2. The structure according to claim 1, wherein the damper is installed so as to surround the pillar. 3. The apparatus according to claim 1, wherein at least one movable plate is attached to the upper structure portion, and at least two fixed plates are provided above and below the movable plate in an arrangement sandwiching the movable plate in a sandwich manner. The middle floor seismic isolation structure of the building described in. 4. The structure according to claim 1, wherein an upper surface of the fixed plate is supported at a height suitable for use as a desk or a table.