JP2631486B2 - Seismic isolation support method and seismic isolation support device for building - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation support for a middle-rise building and a flat or tower-like building having a large height-to-width ratio (aspect ratio). The present invention relates to a method and a seismic isolation support device.

2. Description of the Related Art A recent seismic isolation support method for a building and the principle of a seismic isolation device are based on a principle that a building is supported on the ground by a laminated rubber body formed by alternately stacking and bonding a large number of thin metal plates and rubber sheets. In general, seismic force is prevented from being transmitted to the building as much as possible by the soft deformation performance in the horizontal direction, and the vibration period is lengthened to obtain a seismic isolation effect. Of course, a damping device (damper) is incorporated to suppress the horizontal movement of the building as much as possible (for example, see Japanese Patent Application Laid-Open No. 60-168875).
(See Seismic Isolation Support Method and Seismic Isolation Support Device for Buildings)

The laminated rubber body has the feature that it hardly deforms due to axial compressive force, and it can support large long-term vertical loads of buildings, and it is the biggest feature that it can be softly deformed in the horizontal direction .

Therefore, as illustrated in FIG. 8A, a general low-rise building c supported on a base plate a via a laminated rubber body b.
As shown in Fig. 8B, when a seismic force is applied to the building, it is extremely excellent as a seismic isolation support method and a seismic isolation support device for a building which is merely rigidly moved horizontally and is hardly affected by a falling moment. It has become something.

Problems to be Solved by the Invention By the way, the laminated rubber body shows a unique elongation to the tensile force with respect to the tensile force, and easily deforms several tens times with respect to the tensile force having the same magnitude as the compressive force. There are drawbacks that occur.

On the other hand, recently, many tower-shaped buildings that are slender and tall due to site restrictions, or flat-shaped buildings such as condominiums, in which the width in the short side direction is kept to a certain limit, have appeared.
A building c 'having a large height ratio (aspect ratio) to the width of the building, such as a tower-like or flat-shaped building, is laminated on a base plate a as shown in FIG. When supported by ..., the building c 'is subjected to seismic force and the building c'
As described above, at the same time as the horizontal movement, a rotational motion due to a large overturning moment acts, and in some cases, a negative axial force is generated, and a tensile force may act on the laminated rubber body b. For this reason, the tower-shaped or flat-shaped building has been excluded from the objects of the seismic isolation support method and the seismic isolation support device for the building using the laminated rubber body b, and this point is an issue to be solved. I have.

Therefore, an object of the present invention is to provide a seismic isolation support method and a seismic isolation support device that are effective for a tower or flat building using a laminated rubber body.

Means for Solving the Problems (First and Second Inventions) As means for solving the above-mentioned problems of the prior art, a seismic isolation support method for a building according to the present invention is shown in FIG. As shown in the preferred embodiment in FIGS. 2 to 7, a laminated rubber body 1 formed by alternately stacking and bonding a large number of thin metal plates and rubber sheets on a foundation 8 is installed vertically upward. In a seismic isolation support method for a building in which a damping device is installed between the upper floor plate 6 and the foundation 8 of the building 2 to support the building 2 on the ground 5 and suppress the horizontal movement of the building, 2, a laminated rubber body 3 for preventing falling is installed vertically downward from the reaction frame 9 or 9 ′ at a position where a negative axial force is generated to bear the negative axial force of the building 2. The axial force which the laminated rubber body 3 for prevention bears is the reaction force frame 9 or The processing is performed by transmitting to the ground 5 side via 9 'to prevent a negative axial force from acting on the laminated rubber body 1 for long-term load.

Further, the negative axial force received by the laminated rubber body 3 for preventing overturning is transmitted to the ground 5 by applying a reaction force to the earth anchor 4 for fixing the reaction force frame 9 or 9 ′ to the ground 5. .

When a building 2 having a large aspect ratio receives an earthquake input and a rotational motion (see FIG. 9B) caused by a falling moment acts to generate a negative axial force, the entire building 2 is a laminated rubber body 3 for preventing falling. The ground 5 receives a reaction force through the earth anchor 4 and is treated.

Since the laminated rubber body 3 for preventing falling also has a feature that it hardly deforms due to the compressive force, the negative axial force is reliably received as a compressive force, and the laminated rubber body 1 for a long-term vertical load has a tensile force. Do not act at all.

On the other hand, the horizontal movement of the building 2 is made possible by the flexible deformation of the laminated rubber bodies 1 and 3.

(Third to Fifth Inventions) As means for solving the above-mentioned problems, a seismic isolation support device for a building according to the present invention is also shown in a conceptual view in FIG. 1 and in FIG. 2 to FIG. As shown in the preferred embodiment, a laminated rubber body 1 formed by alternately stacking and bonding a large number of thin metal plates and rubber sheets is placed vertically upward on a foundation 8 to support the building 2 on the ground 5 and Negative axial force is generated in the building 2 that receives the earthquake input in the seismic isolation support device of the building that has installed the damping device that suppresses the horizontal movement of the building 2 between the upper floor plate 6 and the foundation 8 of the building 2 A U-shaped transmission frame 7 is fixedly provided on the lower surface of the upper floor plate 6 of the same building 2 at the part where the building 2 is to be mounted, and an inverted U-shaped reaction force frame 9 is provided on the base plate 8 through the transmission frame 7 and crossed. Is fixed, and a laminated rubber body is provided between the two frames 7 and 9 to prevent falling. The Yes installed from the reaction force frame 9 vertically downward, the reaction force frame 9, characterized in that it is fixed by Tightened and ground anchor 4.

A laminated rubber body 1 formed by alternately stacking and bonding a large number of thin metal sheets and rubber sheets is installed vertically upward on a foundation 8 to support the building 2 on the ground 5 and at the same time the upper floor plate 6 of the building 2
In a base-isolation support device for a building in which a damping device that suppresses horizontal movement of the building 2 is installed between the building and the foundation 8, the base plate is installed at a site where a negative axial force is generated in the building 2 that has received the earthquake input. An inverted U-shaped reaction frame 9 'fixed to 8 is installed so as to pass through an opening 10 provided in the upper floor plate 6 of the building 2 and intersect with the same floor plate.
Between the upper side 9b and the upper floor plate 6 is provided a laminated rubber body 3 for preventing falling down from the reaction force frame 9 'vertically downward,
The reaction force frame 9 'is characterized in that it is tightly fixed to the earth anchor 4.

When a negative axial force due to the overturning moment is generated in the building 2 which has received the earthquake input, the negative axial force is transmitted as a compressive force to the laminated rubber body 3 for preventing the overturn through the transmission frame 7 or the upper floor plate 6 and received. Can be And the laminated rubber body 3
The negative axial force received at step (1) is transmitted from the reaction force frame 9 or 9 'to the ground 5 through the earth anchor 4 and processed, so that no tensile force acts on the laminated rubber body 1 supporting a long-term vertical load.

On the other hand, the horizontal movement of the building 2 receiving the earthquake input is made possible by the flexible horizontal deformation performance of the laminated rubber bodies 1 and 3. In addition, the loose flexibility of the U-shaped transmission frame 7 and the reaction force frame 9 crossed in a chain shape through the U-shaped transmission frame 7 or the upper floor plate 6 for passing the reaction force frame 9 'and its two legs 9a, 9a The horizontal movement of the building 2 is movable within the range of the play by the opening 10 provided.

It should be noted that the negative axial force generated in the building 2 is applied to the laminated rubber member 3 for preventing falling at the position of the upper floor beam (large beam) 11 of the upper floor plate 6.
When it is configured to transmit to, it becomes dynamically clear.

Next, an embodiment shown in the drawings will be described.

First, the seismic isolation support method and the seismic isolation support device for a building shown in FIGS. 2 to 4 alternately place a thin iron plate and a rubber sheet on a foundation beam 12 of a foundation slab 8 constructed on the ground 5. A laminated rubber body 1 formed by stacking and bonding a large number of pieces is installed vertically upward, and a building 2 having a large aspect ratio is constructed thereon, and a portion of an upper floor beam (large beam) 11 has a laminated rubber body 1 for long-term vertical load. Supported by

In the building 2 having a large aspect ratio, a portion where a negative axial force is likely to be generated upon receiving an earthquake input (refer to FIG. 9B) is provided on the lower surface of the upper floor plate 6 of the building 2 by reinforced concrete or steel frame. A transmission frame 7 having a shape is attached and fixed, and an inverted U shape having substantially the same shape as the transmission frame 7 is formed on the base plate 8 so that the transmission frame 7 is crossed and connected in a chain shape through an orthogonal arrangement to the transmission frame 7. Reaction frame 9
Is attached and fixed. At the intersection of the two frames 7 and 9, a laminated rubber body 3 for preventing falling over, which is also formed by alternately stacking a large number of thin iron plates and rubber sheets, is installed vertically downward. The lower ends of both legs of the reaction force frame 9 are fixed to the heads of the ground anchors 4, 4 on the base plate 8, respectively.

Although not shown, the upper floor plate 6 of the building 2 is not shown.
A damping device (damper) for suppressing the magnitude of horizontal movement of the building 2 when subjected to seismic force is installed as an indispensable element between the base plate 8 and the base plate 8.

Therefore, the weight of the building 2 in normal times is all supported by the laminated rubber body 1 for long-term vertical load.

On the other hand, building 2 with a large aspect ratio received earthquake input
Moves in the horizontal direction with the deformation of the two types of laminated rubber bodies 1 and 3, and when a negative axial force is generated by the action of the rotational motion due to the overturning moment (see FIG. 9B). The negative axial force is transmitted from the transmission frame 7 attached to the upper floor plate 6 of the building 2 as a compressive force to the laminated rubber body 3 for preventing overturning, and all of the negative axial force is applied to the laminated rubber body 3 for long-term load. Is processed so that a negative axial force (tensile force) is never generated in the laminated rubber body 1. The negative axial force received by the laminated rubber body 3 for preventing overturning is transmitted from the reaction force frame 9 to the ground 5 through the earth anchor 4 and processed. Incidentally, since the ground anchor 4 generally has a tensile strength of 100 tons or more per one, a negative axial force enough to be received by the laminated rubber 3 for preventing falling can be handled with sufficient margin. It is.

Therefore, even a building 2 having a large aspect ratio, which may generate a negative axial force when receiving an earthquake input, can be a seismically isolated building with ease.

Since the laminated rubber body 3 for preventing falling does not bear the weight of the building 2 at all, as long as the deformation capability in the horizontal direction can follow the laminated rubber body 1 for long-term load, a small-capacity rubber body 3 is used and has a compact structure. It can be implemented.

Second Embodiment Next, the seismic isolation support method and the seismic isolation support device shown in FIGS. 5 to 7 are also applied to the laminated rubber body 1 on the foundation beam 12 of the foundation plate 8 constructed on the ground 5. Is installed vertically upward, and a building 2 having a large aspect ratio is constructed thereon, and a portion of an upper floor beam (large beam) 11 is supported by the laminated rubber body 1 for long-term vertical load.

In the building 2 having a large aspect ratio, a portion where a negative axial force is likely to be generated upon receiving an earthquake input (refer to FIG. 9B), first, an inverted U shape is formed on the base plate 8 by using a reinforced concrete structure or a steel frame structure. A reaction force frame 9 'is formed and fixed. On the other hand, the upper floor plate 6 of the building 2 has an opening 10 having a size that does not hinder the horizontal movement of the building 2 during an earthquake.
10 are provided, and both legs 9a, 9a of the reaction force frame 9 'are respectively raised through substantially the center positions of the openings 10, 10, so that the upper side 9b of the reaction force frame 9' is located on the upper floor plate. It is installed so as to intersect with the upper beam (large beam) 11 of 6. A laminated rubber body 3 for preventing falling is installed vertically downward between the position of the upper floor plate 6, particularly on the upper floor beam 11, and the upper side 9 b of the reaction frame 9 ′, and the negative axial force generated in the building 2 As a compressive force. The lower ends of both legs of the reaction force frame 9 ′ are tightly fixed to the head of the ground anchor 4 on the base plate 8.

Although not shown in the present embodiment, the level of horizontal movement of the building 2 when subjected to seismic force is suppressed between the upper slab 6 of the building 2 and the base plate 8. Damping device is installed.

Therefore, also in the case of this embodiment, the weight of the building 2 under normal conditions is all supported by the laminated rubber body 3 for long-term vertical load.

On the other hand, building 2 with a large aspect ratio received earthquake input
Is caused when the two types of laminated rubbers 1 and 3 move in the horizontal direction with deformation, and when a negative axial force is generated by the action of the rotational motion due to the overturning moment (see FIG. 9B). The negative axial force is transmitted from the upper floor plate 6 of the building 2 as a compressive force to the laminated rubber body 3 for preventing the falling, and all of the negative axial force is applied to the laminated rubber body 3 to be applied to the laminated rubber body 1 for long-term load. The axial force (tensile force) is never generated. The negative axial force received by the laminated rubber body 3 for preventing falling is transmitted from the reaction force frame 9 'to the ground 5 through the earth anchor 4 and processed.

Advantageous Effects of the Present Invention As described in detail in connection with the embodiments above, according to the seismic isolation support method and the seismic isolation support device for a building according to the present invention, a negative axial force is applied when an earthquake input is received. The building 2 having a large aspect ratio that may cause the vibration is also a target of the seismic isolation structure using the laminated rubber body 1, and can be a highly reliable and safe seismic isolation building.

In addition, since the laminated rubber body 3 for preventing falling does not bear the weight of the building 2 at all, as long as its horizontal deformation ability can follow the laminated rubber body 1 for long-term load, use a small-capacity rubber body. It can be implemented economically with a structure.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an embodiment of a method and an apparatus for seismic isolation of a building according to the present invention, and FIG. 2 to FIG.
2 and 3 are sectional views taken along lines II-II and III-III in FIG. 4, and FIG. 4 is a sectional view taken along line IV-III in FIG.
FIGS. 5 to 7 are plan views as seen from the direction of arrows IV, and FIGS. 5 to 7 show the main parts of the second embodiment of the present invention. FIGS. 5 and 6 show V in FIG.
7 is a plan view of FIG. 6, and FIGS. 8A and 8B and FIGS. 9A and 9B are seismic isolation of a conventional low-rise building and a building having a large aspect ratio. It is the conceptual diagram which showed the fluctuation | variation state between the normal time and the time of an earthquake in the support method and the seismic isolation support apparatus. 2 ... building, 1 ... laminated rubber body for long-term load 3 ... laminated rubber body for fall prevention 4 ... earth anchor, 6 ... upper floor plate 7 ... transmission frame, 8 ... basic version 9, 9 ′… Reaction frame, 10… Opening 11… Top floor beam

Continued on the front page (72) Inventor Shigeo Minewaki 2-5-1-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute (56) References JP-A-60-261870 (JP, A)

Claims (4)

(57) [Claims] 1. A laminated rubber body formed by alternately stacking and bonding a large number of thin metal plates and rubber sheets on a foundation so as to be vertically upwardly installed to support the building on the ground, and to connect the upper floor plate of the building to the foundation. In a seismic isolation support method for a building in which a damping device that suppresses horizontal movement of the building is installed, a laminated rubber body for preventing falls is applied to a site where a negative axial force is generated in a building that has received an earthquake input. Installed vertically downward from the frame to bear the negative axial force of the building,
A building characterized in that the axial force borne by the laminated rubber body for preventing falling is transmitted to the ground side through the reaction frame and processed to prevent a negative axial force from acting on the laminated rubber body for long-term load. Seismic isolation support method. 2. The method according to claim 1, wherein the negative axial force received by the laminated rubber body for preventing overturning is transmitted to the ground by applying a reaction force to an earth anchor for fixing the reaction force frame to the ground. The seismic isolation support method for the listed building. 3. A laminated rubber body formed by alternately stacking and bonding a large number of thin metal plates and rubber sheets vertically on a foundation to support the building on the ground, and to connect the upper floor plate of the building to the foundation. A seismic isolation support device for a building that has a damping device that suppresses the horizontal movement of the building in the area where a negative axial force is generated in the building that received the earthquake input, A transmission frame having a fixed shape is fixedly provided, and an inverted U-shaped reaction force frame which is passed through the transmission frame and intersected is fixedly provided on the base, and a laminated rubber body for preventing overturn is provided between the two frames. A seismic isolation support device for a building, which is installed vertically downward from a force frame, wherein the reaction force frame is tightly fixed to an earth anchor. 4. A laminated rubber body formed by alternately stacking and bonding a large number of thin metal sheets and rubber sheets on a foundation so as to be vertically upwardly supported to support the building on the ground, and between the upper floor plate of the building and the foundation. In a seismic isolation support device for a building that has a damping device that suppresses horizontal movement of the building, an inverted U-shaped reaction force fixed to the foundation at the site where a negative axial force occurs in the building that received the earthquake input The frame is installed so that it passes through the opening in the upper floor plate of the building and intersects with the upper floor plate, and the laminated rubber body for preventing falling falls between the upper edge of the reaction force frame and the upper floor plate. A seismic isolation support device for a building, which is installed vertically downward from a frame, wherein the reaction frame is fixed in tight contact with an earth anchor.