JPH0742407A - Base isolation device for suspension structure - Google Patents

Abstract

PURPOSE:To damp seismic forces transmitted into a frame of a main body due to an earthquake so as not to be transmitted to a structure supported by the frame. CONSTITUTION:In a suspension structure wherein a suspending member 4 is suspended from a frame 1 of a main body and a suspended structure 7 is suspended and supported by the member 4, the member 4 is suspended from the frame 1 through a laminated rubber 5 provided on the frame 1. The upper end of the member 4 is supported by a pin structure rotatably mounted to the upper surface of the rubber 5, while the lower part thereof is connected to an uppermost beam portion of the structure 7 through a rotatable pin structure, and the structure 7 supported by the suspension member is connected to the frame 1 through a damper for absorbing horizontal vibrations. The length of the suspension member can be limited without changing period of vibration of the suspension mechanism so that the economy of space can be obtained and propagation of sound of solid from the frame 1 is reduced to produce soundproof effects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation system for damping a seismic force entering a main body frame due to an earthquake or the like so as not to be transmitted to the supported structure in a suspension structure in which a supported structure is suspended and supported by a main body frame. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device having a hanging structure, one utilizing the idea of a flexible structure is disclosed in, for example, Japanese Patent Laid-Open No. 54-84.
No. 330 and JP-A-1-247667. Generally, the suspension structure is a structure in which a part of a structure such as a floor slab is suspended from the main body frame and a seismic force damping mechanism (seismic isolation device) is provided between the main frame and the main frame. There is an advantage that the shaking of the floor and the main frame due to force or wind force can be suppressed to a small level.

The details thereof will be described in the above-mentioned Japanese Patent Laid-Open No.
The suspension structure disclosed in Japanese Patent Publication No. 4-84330 suspends a suspension member from a horizontal rod of a supporting frame in a rigid body such as a gate shape or a T-shape, and suspends a supported frame structure at the lower end of the suspension member.
A buffer or the like is provided between the supporting frame and the supported frame. Further, the suspension structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-247667 has a small frame group consisting of floor slabs or beam floors in the internal space of a building main frame composed of columns and beams, with a suspension material interposed from the beams of the main frame. And is suspended and supported, and a vibration damping device is interposed between the floor of the small frame and the main frame.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The seismic isolation effect varies depending on the cycle of the suspension mechanism (the suspension material or suspension material described above), and the seismic force entering the building can be reduced by lengthening the cycle in which the building shakes. Depending on the cycle of the main frame, it is necessary to make the suspension cycle very long in order to obtain a large seismic isolation effect. For this reason, in the above-mentioned conventional technique, the hanging length becomes too long, which makes it difficult to carry out, and the space saving effect is also hindered. Further, in the related art, since the supported structure is directly connected to the main frame, the propagation of solid sound from the main frame cannot be effectively reduced.

Therefore, when the suspension structure is adopted, the object of the present invention is to reduce the suspension length without changing the cycle of the suspension mechanism to enable a space-saving effect and to propagate solid sound from the main frame. It is to provide a seismic isolation device having a suspension structure that can be reduced.

[0006]

As a means for solving the above problems, the seismic isolation structure in the suspension structure according to the present invention suspends a suspension member 4 from a main body frame 1 and is supported by the suspension member 4. In the hanging structure in which the structure 7 is suspended and supported, the hanging member 4 is hung from the main body frame via the laminated rubber 5 installed in the main body frame 1.

According to the present invention, the suspending member 4 has its upper end supported on the upper surface of the laminated rubber 5 by a rotatable pin structure, and its lower end connected to the uppermost beam portion of the supported structure 7 by a rotatable pin structure. The supported structure 7 suspended and supported by the suspension member is connected to the main body frame 1 via a damper that absorbs horizontal vibration.
It is also characterized by being connected with.

[0008]

Even if seismic force or the like enters the main body frame 1 and vibrates, the supported structure 7 is oscillated because the seismic isolation device including the suspending member 4 and the laminated rubber 5 extends the period. Also,
Since the vibration energy is absorbed by the damper 8,
The shaking of the main frame 1 also becomes smaller at the same time. The laminated rubber 5 reduces not only horizontal vibration (vibration) but also solid sound propagation. As a result of adding the cycle of the laminated rubber 5, the length of the suspending member 4 can be shortened without changing the cycle of the suspending mechanism, and the space saving effect can be obtained accordingly.

Explaining the above-mentioned effects concretely, looking at the relationship between the length L of the suspension rod 4 and the cycle T of the suspension mechanism, if the gravitational acceleration is g, then equation 1 is obtained. [Equation 1] T = 2π (L / g) ^{1/2 If} the laminated rubber 5 having the period Tr is used, the entire period T
t becomes the number 2.

[Equation 2] Tt ² = T ² + Tr ² Now, if the same period To is set, when the laminated rubber is not used, the period of the suspension rod is T ₂ , and the length is L _2.
2 = To, the equation 3 is obtained.

[Equation 3] When T ₂ = 2π (L2 / g) ^1/2 laminated rubber is used, the equation 4 is obtained when the period of the suspension rod is T ₁ and the length is L ₁ . [Equation 4] To ² = T ₁ ² + Tr ² , T ₁ = 2π (L ₁ / g) ^{1/2 From} Equation 3 and Equation 4, Equation 5 is obtained, and the difference in length of L ₂ −L ₁ is obtained. .

[Formula 5] T ₂ ² = T ₁ ² + Tr ² , 4π ² (L ₂ / g) = 4π ² (L ₁ / g) + Tr ² ∴L ₂ −L ₁ = (Tr ² · g) / (2π) ²

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an elevational view of a suspended structure building that employs the seismic isolation device of the present invention. The main body frame 1 is composed of a large pillar 2 and a beam 3 in a so-called superframe, and a suspension rod 4 is suspended from the beam 3. The suspension rod 4 supports a plurality of layers of the supported structure 7 in a suspended state within the main body frame 1. As shown in FIG. 2, the upper end of the hanging rod 4 is supported by a spherical structure 6 in a rotatable pin state on the upper surface of the laminated rubber 5 installed on the beam 3. As shown in FIG. 2, the laminated rubber 5 is formed by laminating a plurality of thin iron plates and rubber sheets and laminating them together. The laminated rubber 5 has a feature of supporting a large vertical load and exhibiting soft deformability in the horizontal direction. The lower end of the suspension rod 4 is rotatably connected to the uppermost beam portion 7a of the supported structure 7 in a pin state.
In the case of the embodiment shown in FIG. 1, the supported structure 7 has six layers, and the beams (floors) 7a on each floor are supported by suspension columns 7c. The beams 7 a on each floor are connected to the columns 2 of the main body frame 1 via dampers 8. The damper 8 is a direct-acting type in which a liquid such as oil is sealed in a cylinder, and a damping force is exerted by resistance due to a pressure difference between both surfaces of the piston when flowing through an orifice of the piston in the cylinder.

In the above embodiment, one laminated rubber 5 supports one suspension rod 4, but a plurality of laminated rubber 5 supports one suspension rod 4 as shown in FIG. Configurations can also be implemented. What is shown in FIG. 3 is four laminated rubbers 5.
Is sandwiched between the suspension rod support plate 9 and the beam 3, and the suspension rod 4 penetrating the hole of the beam 3 is rotatably supported by the pin structure 6 on the upper surface of the suspension rod support plate 9.

Next, the operation of the seismic isolation device in the above-mentioned suspension structure will be described. Main frame 1 due to seismic force
If it shakes, as shown by the dotted line in Fig. 2, the laminated rubber 5
And the rotation of the suspension rod 4 cause the supported structure 7 to swing in the direction opposite to the swing of the beam 3 of the main frame 1. Then, the horizontal sway is absorbed by the damper 8 and a sufficient seismic isolation is exerted.

By the way, the period T of the laminated rubber is expressed by the above equation 5.
Substituting r = 2 seconds, L2-L1 = 99 cm,
The suspension rod with "with laminated rubber" is shortened by about 1 m. Therefore, the length of the suspending material can be shortened without changing the cycle of the suspending mechanism, and the space saving effect can be achieved. On the other hand, the propagation of solid sound from the main body frame 1 is also reduced by the laminated rubber 5, and a sufficient soundproof effect is achieved.

[0017]

According to the seismic isolation device of the suspension structure according to the present invention, since the laminated rubber 5 is disposed between the suspension member 4 and the main body frame 1, the suspension mechanism is suspended without changing the cycle of the suspension mechanism. The length of the material can be suppressed and a space saving effect can be obtained. Further, the propagation of the solid sound from the main body frame 1 is effectively reduced, and the soundproof effect is sufficiently exhibited.

[Brief description of drawings]

FIG. 1 is an elevational view of a suspension structure building using a seismic isolation device according to the present invention.

FIG. 2 is an enlarged view showing a supporting state of a laminated rubber and a suspension rod.

FIG. 3 is a perspective view showing a supporting state with a suspension rod when a plurality of laminated rubbers are used.

[Explanation of symbols]

 1 Main frame 2 Pillars 3 Beams 4 Hanging rods 5 Laminated rubber 6 Spherical structure 7 Supported structure 8 Damper

Claims (2)

[Claims] 1. A suspending structure in which a suspending material is suspended from a main body frame, and a structure to be supported is suspended and supported by the suspending material, wherein the suspending material is suspended from the main body frame via a laminated rubber installed on the main body frame. A seismic isolation device with a hanging structure characterized by being lowered. 2. An upper end of the suspending member is supported on the upper surface of the laminated rubber by a rotatable pin structure, and a lower end is connected to the uppermost beam portion of the supported structure by a rotatable pin structure. The seismic isolation structure of the suspension structure according to claim 1, wherein the supported structure that is suspended and supported is connected to the main body frame via a damper that absorbs horizontal vibrations.