JP2511320B2 - Seismic isolation support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is mainly applied to middle- and low-rise buildings to seismically isolated buildings that economically reduce horizontal seismic input, or floors on which computers and the like are installed. It relates to seismic isolation bearings that can be constructed as a non-isolation structure at times such as when there is a strong wind or when necessary in a seismically isolated floor.

(Prior Art) Conventionally, in a base-isolated building, it is necessary to consider and study so as not to feel unpleasant sway in strong winds, etc., and in many cases, the rigidity of a metal damper has dealt with this problem. Also, in the seismic isolation floor, install a trigger device or devise a spring mechanism so that the seismic isolation device will operate when an external force above a certain level is applied, so that it will not inadvertently swing due to external force due to work, etc. It is carried out.

(Problems to be solved by the invention) However, in order to avoid fluctuation due to a small external force by modifying the rigidity of the metal damper and the spring mechanism, a slight vibration such as traffic vibration or small earthquake, Seismic isolation was not very effective against vibration, and when the trigger device was used, it was necessary to restore the trigger device to its original state after the earthquake.

The present invention is proposed in view of the problems of the above-mentioned prior art, and its object is to provide a non-vibration source for a vibration source of a strong wind for a long time and other cases where seismic isolation is not required. The point is to provide seismic isolation bearings that can have a seismic isolation structure.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the seismic isolation bearing according to the present invention has a high pressure in a seal space formed between a bearing plate arranged on a base and a bearing of a structure. In a structure for supporting a structure in which a fluid supply device is connected and a ball block mounted on the bearing and a seal portion made of magnetic fluid are provided on the outer peripheral edge of the seal space, the tip end of the pole block is more than the bearing. The bearing is slidably mounted on the bearing within a range in which it projects a predetermined length from the retracted state.

(Operation) Since the present invention is configured as described above, at the time of seismic isolation, the high pressure fluid is press-fitted into the seal space formed between the pressure bearing plate on the base and the bearing of the structure, thereby making the structure Is supported by fluid pressure.

At this time, the pole block mounted on the bearing and the magnetic fluid seal the outer peripheral edge of the seal space so that the seal is not broken due to the press-fitting of the high-pressure fluid into the seal space.

Therefore, since only the fluid is interposed between the bearing plate and the bearing, the frictional force hardly acts and only the vertical force is supported.

In the case of non-seismic isolation, the fluid pressure in the seal space is reduced to bring the bearing and the bearing plate into contact with each other to generate a frictional force therebetween.

Since the tip of the pole block is slidably mounted within the range in which it projects a predetermined length from the state in which the pole block is retracted from the bearing, the bearing and the pressure plate are accompanied by the increase and decrease of the fluid pressure in the seal space. The pole block slides with respect to the bearing in response to the change in the distance between the pole block and the pole block.

(Examples) The present invention will be described below with reference to illustrated examples.

Reference numeral 1 denotes a structure, which is supported on a bearing plate 2 installed on a foundation via a seismic isolation bearing a of the present invention.

Bearing 3 installed on the structure 1 in the seismic isolation bearing a
An air conditioner presser 5 is connected to a seal space 4 formed between the pressure bearing plate 2 and the pressure bearing plate 2 via an air pipe 7 in which an automatic control valve 6 is interposed. The distance sensor 8 detects the distance to the automatic control valve 6 by amplifying this detection signal with the amplifier 9, and the external input data 10 supplied to the valve 6 together with the gap of the seal space 4 The control valve 6 is controlled so as to keep it constant within a range where a magnetic fluid seal described later does not break.

In the figure, 11 is distance data sent from the distance sensor 8 to the control valve 6, and 7'is an air pipe for discharging high pressure air in the seal space 4 connected to the control valve 6.

Reference numeral 12 is a pole block arranged on the outer peripheral portion of the seal space 4, and the tip end of the pole block 12 is the bearing 3
It is slidably mounted on the support 3 within a range in which it projects a predetermined length from the retracted state.

When it is difficult to manufacture a cylindrical magnet that connects the pole blocks 12 to each other, the bar magnet 13 is used.

Further, the magnetic fluid b is appropriately supplied from the magnetic fluid replenishing device to the outer peripheral edge of the seal space 4, and the seal space 4 is sealed.

Reference numeral 14 in the drawing denotes a stopper, which is arranged so as to stop at a predetermined position because the pole block 12 portion slides.

Since the illustrated embodiment is configured as described above,
At the time of seismic isolation, as shown in FIG. 1, air is sent into the seal space 4 through the air pipe 7, and the space 4 reaches a predetermined height within a range in which the seal by the magnetic fluid b is not broken. At this time, the distance sensor 8 detects it, and the automatic control valve 6 is closed to keep the gap between the bearing 3 and the bearing plate 2 constant.

When the seismic isolation is performed from this state, the control valve 6 and the air discharge air pipe 7'are connected to reduce the air pressure in the seal space 4, thereby supporting the bearing 3 and the bearing 3 as shown in FIG. The pressure plate 2 is brought into contact with each other so that a frictional force acts between them.

At this time, the movement of the bearing 3 is not hindered by sliding on the pole block 12 bearing 3.

Further, when increasing the frictional force between the bearing 3 and the pressure support plate 2, the contact surfaces of both or one of them is made rough.

FIG. 4 shows another embodiment of the present invention, in which the bearing 3 is made of a magnetic material such as iron and the pole block 12 and the bearing 3 are sealed by a non-magnetic material seal 15. Further, the pole block 12 is arranged outside the support 3 to facilitate the management of the magnetic fluid.

The pole block 12 may be fixed to the bearing 3 in a state where the end portion thereof does not protrude from the bearing 3.

Although a circular bearing is shown in the above embodiment, it may be formed in a rectangular shape.

(Effect of the invention) The seismic isolation bearing according to the present invention, as described above, has a seal space formed between the bearing plate of the base and the bearing of the structure,
By connecting a high-pressure fluid supply device and providing a pole block mounted on the bearing and a seal part made of magnetic fluid on the outer peripheral edge of the seal space, the vertical pressure of the structure due to the fluid pressure in the seal space Support.
In this way, the presence of only fluid in the same seal space causes almost no frictional force, works to support only vertical force, and does not input horizontal force, so that an excellent seismic isolation effect is exhibited. Is.

Further, at the time of non-seismic isolation, by lowering the fluid pressure in the seal space and bringing the bearing and the bearing plate into contact with each other, a frictional force is generated between the bearing and the bearing plate. It is to prevent unnecessary shaking of the.

[Brief description of drawings]

FIG. 1 and FIG. 2 are vertical cross-sectional views showing a seismic isolation and non-seismic isolation state of an embodiment of the seismic isolation bearing according to the present invention, respectively. FIG. 3 is a partial transverse plan view thereof, and FIG. FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 5 is a side view of a structure having a base isolation bearing according to the present invention. 1 ... Structure, 2 ... Pressure plate, 3 ... Bearing, 4 ... Seal space, 5 ... Air conditioner press, 6 ... Automatic control valve 7,7 '... Air piping, 8 ... Distance sensor , 12 …… Paul Block.

Claims (2)

(57) [Claims] 1. A high-pressure fluid supply device is connected to a seal space formed between a bearing plate installed on a base and a bearing for a structure, and the bearing is mounted on the outer periphery of the seal space. In a structure for supporting a structure including a pole block and a magnetic fluid seal, the pole block is slidably mounted on the bearing within a range in which the tip of the pole block projects from the bearing by a predetermined length. Seismic isolation bearing characterized by being hung. 2. The seismic isolation bearing according to claim 1, wherein the pole block end is fixed to the bearing without protruding from the bearing.