JP2591503B2 - Static friction trimming device of friction type seismic isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static friction trimming device for a friction type seismic isolation device.

[0002]

2. Description of the Related Art In recent years, the development of seismic isolators has been activated, and researches on friction type seismic isolators have recently been conducted for practical use. This friction-type seismic isolation device utilizes clone frictional force. When a large force exceeding the maximum static frictional force acts on a building in a horizontal direction, the frictional force is cut off and the building starts to slide. The friction-type seismic isolation device is configured as a unit including a pair of upper and lower horizontal friction plates disposed between the lower part of the building and the foundation, and a low-friction sliding material is interposed between the friction plates. Since the friction plate has a thickness of several centimeters in the vertical direction, there is an advantage that the space under the building can be significantly reduced as compared with the conventional seismic isolation device using laminated rubber.

[0003]

However, the conventional friction-type seismic isolation device has a problem that the maximum static friction force is very large because the weight of the building is large, and the building does not start to slide unless a large earthquake occurs. For this reason, the seismic isolation function did not work during a small earthquake, and it was difficult to apply the friction type seismic isolation device to a building containing computers, communication devices, and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a static friction rim of a friction type seismic isolation device capable of quickly breaking a static friction even in a middle or small earthquake so that a building starts to slide. It is intended to provide a device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a friction type seismic isolation device of a friction type seismic isolation device, wherein a building and a foundation thereof are not connected to each other, and the weight of the building is reduced by the weight of the foundation. In a friction-type seismic isolation device that is supported by a pair of upper and lower friction plates disposed on an upper surface and a sliding material is interposed between the pair of friction plates, magnetic repulsion or suction is performed between the building and a foundation. A magnetic unit composed of a pair of elements is disposed, and a maximum static friction force between the pair of friction plates is reduced by applying a repulsive or attractive force of the magnetic unit to the building in an upward direction. is there.

[0006]

With the static friction trimming device (hereinafter referred to as the trimming device) of the friction-type seismic isolation device configured as described above, the weight borne by the pair of friction plates due to the repulsion or the attraction force of the magnetic force unit is reduced, and accordingly, Since the maximum static friction force of the friction plate is reduced, even in a small or medium-sized earthquake, the friction force of the friction plate is quickly cut and the building starts to slide, thereby preventing the horizontal force of the earthquake from being transmitted to the building. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a side surface of a building 2 on which a friction type seismic isolation device 1 is constructed. This friction type seismic isolation device 1
Is disposed between the lower part of the building 2 and the upper surface of the foundation 3. More specifically, as shown in FIGS. A pair of upper and lower horizontal friction plates 6, 7 at the tips of concrete short columns 4, 5
And a large number of such friction plates 6 and 7 are provided to support the weight of the building 2 with the friction plates 6 and 7. Friction plates 6, 7
The low friction sliding material 8 is interposed between the
7 is reduced to a predetermined magnitude.
Superconducting coils 9 and 10 as magnetic units are wound around the outer circumferences of the short columns 4 and 5, respectively.
When 0 is energized, superconducting coils 9 and 10 strongly repel each other due to magnetic force, and this repulsive force acts on building 2 in an upward direction. In this embodiment, the magnetic force unit forms the main body of the trimming device.

[0008] The magnetic unit may be of a type of magnetic attraction, and FIG. 3 shows an example of such a magnetic unit. That is, a pair of friction plates 6, 6
7, the upper friction plate 6 is connected to the lower part of the building 2 by short columns 14, and a superconducting coil 15 is disposed on the upper surface of the friction plate 6. Another superconducting coil 16 is disposed above the superconducting coil 15, and the superconducting coil 16 is supported on the upper surface of the foundation 3 by a support 17. In such a magnetic force unit, the attraction force of the superconducting coils 15 and 16 acts on the building 2 upward.

Since the magnetic unit needs to have a strong magnetic repulsion or attractive force, it is preferable to use a superconducting coil. At least low-temperature superconductivity has been confirmed at present, but it would be more convenient if high-temperature (normal temperature) superconductivity could be used. As described above, the magnetic force unit may use a pair of superconducting coils, or may use one superconducting coil and one superconducting diamagnetic material. Note that the latter type of magnetic force unit is limited to the case where magnetic repulsion is used. When a friction type seismic isolation device is applied to a building having a relatively small total weight or a part of the building, a room-temperature normal-conducting coil may be used as the magnetic force unit.

In the trimming device constructed as described above, when the superconducting coils 9, 10 (15, 16) are energized, the magnetic repulsion (attractive force) acts on the building 2 in the upward direction, and the weight of the building apparently increases. Decrease. Therefore, the maximum static friction force of the friction plates 6 and 7 is reduced, and the static friction force is cut even in a small or small earthquake, and the building 2 starts to slide, thereby preventing the horizontal force due to the earthquake from being transmitted to the building 2. Can be. Since it is uneconomical to energize the superconducting coils 9, 10 (15, 16) constantly, it is preferable to energize only when an earthquake of a predetermined magnitude occurs. In this case, the earthquake sensor and the current control device are combined.

As a corollary to the fact that the edging device apparently reduces the weight of the building, the repulsion or attractive force of the magnetic unit may be a force that reduces the maximum frictional force. Needless to say, it is not necessary to have enough force to ascend.

[0012]

According to the edging device of the present invention, the apparent weight of the building is reduced by the magnetic force unit. Therefore, even in a small earthquake, the static friction force of the friction plate is cut and the building starts to slide, and the horizontal force due to the earthquake is reduced. It can be prevented from acting on the building.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a base-isolated building.

FIGS. 2A and 2B are side views of a friction-type seismic isolation device and a trimming device.

FIG. 3 is a side view of another friction-type seismic isolation device and a trimming device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Friction type seismic isolation device 2 Building 3 Foundation 6,7 Friction plate 8 Low friction sliding material 9,10,15,16,20,21,29 Superconducting coil 30 Permanent magnet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Jun Takeuchi 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-64-66335 (JP, A)

Claims (1)

(57) [Claims] 1. A building and a foundation thereof are not connected to each other, and the weight of the building is supported by a pair of upper and lower friction plates disposed on an upper surface of the foundation, and a sliding material is interposed between the pair of friction plates. In the friction-type seismic isolation device, a magnetic unit composed of a pair of elements that repels or attracts by magnetic force is disposed between the building and the foundation, and the repulsive or attractive force of the magnetic unit is applied to the building. A static friction trimming device for a friction type seismic isolation device characterized by acting upward to reduce a maximum static friction force between the pair of friction plates.