JPH061090B2 - Seismic isolation support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a seismic isolation support device used for seismically supporting a control room, a computer room or the like in which complicated and precise equipment is placed when an earthquake occurs. is there.

[Prior Art] Even if a building with a control room or a computer room where complicated and precise equipment is installed receives an earthquake force when an earthquake occurs,
It is strongly felt that it is necessary to prevent the seismic force from being transmitted to the equipment such as the control room and the computer room so that the equipment can continue to function even in the event of a large earthquake, and therefore the floor of the building itself. In recent years, the development of seismic isolation support device for seismic isolation structure has been actively carried out.

Generally, when a building receives a seismic force at the time of an earthquake, the building shakes not only horizontally but also vertically, so the seismic isolation support device may have a three-dimensional buffering function. is necessary.

With the conventional seismic isolation structure, the peak frequency of the earthquake is 5 to 10 Hz, and the natural frequency of the heavy object supported by the spring is set to 1 Hz or less so that the vibration transmitted from the ground to the heavy object is spring. It is intended to be absorbed and blocked by.
As one of such spring devices for seismic isolation, there is a laminated seismic isolation rubber or an air spring.

The laminated anti-vibration rubber is, as shown in FIG. 2, integrated by interposing a thin rubber plate c and a thin steel plate d alternately stacked between two upper and lower steel plates a and b and bonded. is there.

Further, as shown in FIG. 3, the air spring is provided with a rubber film g having a U-shaped cross section between a case e and a block f to form a sealed space inside, and the rubber film g is deformed to form a case g. The block f and the block f are displaced relative to each other so as to oppose an external force by the pressure of the air inside the closed space.

[Problems to be solved by the invention] However, in the case of laminated anti-vibration rubber, due to the elastic mechanical properties of the rubber, it is rigid against vertical loads, has a large spring constant, and is resistant to horizontal loads. Has a characteristic that it is soft and has a small spring constant, so that when it is used as a supporting device, there is a problem in that it is not possible to obtain vertical seismic isolation even if horizontal seismic isolation is obtained. In the case of air springs,
Due to its structure, vertical and horizontal seismic isolation can be obtained, but it is difficult to take a sufficient allowable stroke in the horizontal direction due to the strength of the rubber film g, and there is a problem that a large seismic force cannot be endured.

In this way, both laminated rubber and air springs have problems, so recently, the laminated rubber and air springs have been skillfully combined to provide a sufficient seismic isolation function in the vertical and horizontal directions. A seismic isolation support device that achieves the above is considered (Japanese Patent Application No. 61-229766).

However, the rubber plate c that constitutes the laminated anti-vibration rubber is likely to be deteriorated over the years, and if it becomes hard and difficult to deform, a situation such as cracking when a horizontal load is applied may occur.

Therefore, the present invention takes the above-mentioned recently considered one step further and provides a durable seismic isolation support device for the seismic isolation floor of a building.

[Means for Solving the Problems] In order to achieve the above object, the present invention is a case in which a cylindrical body is fixed to one surface of a disk, and is freely displaceable in the vertical and horizontal directions inside the case. Air that is airtightly connected to the outer periphery of a block having a size that is possible with a donut-shaped flexible thin plate material to form an air chamber that is sealed by the case, the block, and the flexible thin plate material. An inner cylinder rubber and a cylindrical body which are provided with a spring and a ball bearing formed by interposing a large number of balls between the plate and the outer surface side of the block constituting the air spring, and which are attached to the outer surface of the block. The flexible thin plate material is protected by an outer cylinder rubber attached to the inner surface of the base plate, and is interposed between the base isolation floor and the fixed floor to support the base isolation floor.

[Operation] The vertical load can be eased by the air spring, and the horizontal load can be mitigated by the ball bearing mechanism. It has a three-dimensional seismic isolation function, and even if the building receives seismic force. You can support without telling the tremor.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a case 2 composed of a cylindrical body 3 and a disc 4 for forming an air chamber 5 is freely movable in the vertical and horizontal directions inside the case 2. The outer peripheral portion of the block 6 which can be displaced is airtightly connected via a diaphragm 7 whose central portion is cut out in a donut shape, and the air chamber 5 surrounded by the case 2, the block 6 and the dough diaphragm 7 becomes a closed space. Configuring the air spring 1,
A recess 8 is formed on the lower surface of the block 6 of the air spring 1, and a large number of balls 10 are interposed between the recess 8 and a plate 9 fixed to the floor to form a ball bearing 11. The case 2 is fixed to the base isolation floor 12, and the plate 9 of the ball bearing 11 is fixed to the fixed floor 13 of the building. Reference numeral 14 denotes a rubber stopper provided on the upper surface of the block 6 for supporting the case 2 by abutting the disk 4 of the case 2 when the air in the air chamber 5 is evacuated,
Reference numeral 15 is an inner cylinder rubber attached to the outer surface of the block 6, and 16 is an outer cylinder rubber attached to the inner surface of the cylindrical body 3.
The diaphragm 7 is protected by 15 and the outer tube rubber 16.

Although not shown, the height of the air spring 1 is adjusted by compressing and supplying air from an air supply source to the air chamber 5 of the air spring 1 or discharging the air in the air chamber 5 to the atmosphere. It is equipped with an automatic leveling device that controls the seismic isolation floor 12 and keeps the level of the seismic isolated floor 12 horizontal.

In a state where air is enclosed in the air chamber 5 of the air spring 1, the case 2 of the air spring 1 is fixed to the seismic isolation floor 12 as shown, and the bearing plate 9 of the ball bearing 11 is fixed to the fixed floor 13 for use. When a building receives a seismic force during the operation, the fixed floor 13 vibrates together with the building because the fixed floor 13 has an integral structure with the building. The seismic isolation floor 12 is supported on the fixed floor 13 by the seismic isolation support device of the present invention,
The vertical shaking of the fixed floor 13 due to the earthquake is transmitted to the block 6 through the bearing plate 9 and the balls 10, but the air from the block 6 to the seismic isolated floor 12 is mitigated by the air spring 1. The vertical load of 13 is not transmitted to the base isolation floor 12. In addition, with respect to horizontal shaking of the fixed floor 13 due to an earthquake, the fixed floor 13 and the seismic isolated floor 12 side are provided by the ball bearings 11 formed between the plate 9 on the fixed floor 13 side and the lower surface of the block 6. Since and can move relatively freely in the horizontal direction, the horizontal load on the fixed floor 13 can be alleviated by the ball bearings 11 and the horizontal load can be prevented from being transmitted to the seismic isolated floor 12. In this way, the vertical load when the building receives seismic force is mitigated by the upper air spring 1 and the horizontal load is mitigated mainly by the lower ball bearing 11 so that the three-dimensional structure can be easily obtained. The seismic isolation function can be demonstrated.

The present invention is not limited to the above-described embodiment, and, for example, the ball bearing 11 may be provided at the bottom of the air spring 1.
In this example, the ball bearing 11 side is fixed to the fixed floor 13 side, and the air spring 1 is fixed to the seismic isolation floor 12 side, respectively. The bearing 11 may be attached to the seismic isolation floor 12 side, and when the upper bearing freely moves horizontally by the ball bearing 11, as shown in the figure, the block 6 and the fixed floor 13 are horizontally moved in an appropriate direction. It is optional to dispose the spring 17 so that the block 6 can be restored.

[Effects of the Invention] As described above, according to the seismic isolation support device of the present invention, a case in which a cylindrical body is fixed to one surface of a disk and the inside of the case can be freely displaced in the vertical and horizontal directions. An air spring in which the outer periphery of a block having a size is airtightly connected by a doughnut-shaped flexible thin plate material to form an air chamber sealed by the case, the block and the flexible thin plate material. And a ball bearing in which a large number of balls are interposed between the plate and the outer surface side of the block constituting the air spring, and the inner cylinder rubber and the cylindrical body mounted on the outer surface of the block. The flexible thin plate material is protected by an outer cylinder rubber attached to the inner surface, and it is interposed between the seismic isolated floor and the fixed floor to support the seismic isolated floor. Even if the building receives a large earthquake force due to The air spring can absorb the vertical shake, the ball bearing can absorb the horizontal shake, and the base isolation floor can be reliably isolated by the simple structure of the air spring and the ball bearing. In this case, the air spring is configured. Since the block that is being operated is of a size that can be freely displaced not only in the vertical direction but also in the horizontal direction inside the case, the horizontal shaking of the building can be isolated by the relative displacement of the case and the block in the horizontal direction. Since it is not transmitted to the seismic isolated floor, and the flexible thin plate material is protected by the inner cylinder rubber and the outer cylinder rubber, the flexible thin plate material is deformed by the relative displacement of the block and the case. Also, the ball bearing that is not damaged, and has a long life, has a stable seismic isolation effect for a long time, and has excellent reliability and durability. Door can be.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a side view of a conventional laminated vibration-proof rubber, and FIG. 3 is a sectional view of a conventional air spring. 1 ... Air spring, 2 ... Case, 3 ... Cylindrical body, 4 ... Disc, 5
… Air chamber, 6… Block, 7… Diaphragm (flexible thin plate material), 9… Plate, 10… Ball, 11… Ball bearing, 12… Seismic isolation floor, 13… Fixed floor, 15… Inner tube rubber, 16 … Outer tube rubber.

Claims (1)

[Claims] 1. A donut-shaped flexible case comprising a case in which a cylindrical body is fixed on one side of a disk and an outer peripheral portion of a block sized so as to be freely displaceable in the vertical and horizontal directions inside the case. An air spring which is airtightly connected by a thin plate material and forms an air chamber sealed by the case, the block and the flexible thin plate material, and the outer surface side of the block and the plate which constitute the air spring. A ball bearing having a large number of balls interposed between them, and the flexible thin plate material is composed of an inner tube rubber attached to the outer surface of the block and an outer tube rubber attached to the inner surface of the cylindrical body. A seismic isolation support device, which is configured to be protected and is configured to be interposed between a seismic isolation floor and a fixed floor to support the seismic isolation floor.