JPH04182578A - Earthquake-proof building - Google Patents

Abstract

PURPOSE:To enable it to set the proper period of a building freely by installing a controller, keeping an interspace constant, in a high pressure fluid feeder connected to the interspace between a bearing pressure plate and a bearing of the building, and setting up a spring element or the like in an interval between the structure and a foundation bed. CONSTITUTION:A high pressure fluid feeder and an earthquake-proof bearing (a) consisting of its controller are installed in a seal space 4 formed in an interval between a bearing 3 supported on a structure 1 and a bearing pressure plate 2 set up in a foundation bed. In addition, a spring element (b) consisting of a tension coil spring and a damping element (c) consisting of a viscous damper 16 both are interposed between the structure 1 and the foundation bed. Then, a distance between the bearing 3 and the bearing pressure plate 2 is detected by a controller of the earthquake-proof bearing (a), while a high pressure fluid is properly fed to the inside of the space 4 by means of the high pressure fluid feeder, thus a clearance in the space 4 is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seismic isolation structure that economically reduces horizontal seismic input, mainly aimed at medium- and low-rise buildings.

(Conventional technology) Conventionally, most of the support parts of seismic isolation structures have used laminated rubber that has both the functions of a support and a spring element, and a few have also adopted sliding bearings. .

(Problems to be Solved by the Invention) However, the laminated rubber has the following problems.

i) Due to the characteristics of the rubber material and the design of the equipment, the natural period of the N-free building is 1 to 3 seconds, so it cannot be used on sites with poor ground conditions.

11) The height of the equipment is several tens of meters high, creating wasted space.

1ii) Because it is made to order and made to order, the cost is high and the production period is long.

Additionally, sliding bearings have the following problems.

i) There is a large possibility that the coefficient of friction and frictional force will fluctuate due to changes in material properties over time, changes in loading weight, etc., so margins in design and careful maintenance are essential.

1i) ff Since the friction force is always working, there is a possibility that the device will not return to its original position after being activated.

The present invention has been proposed in view of the problems of the prior art described above, and its purpose is to allow the natural period of a building to be set freely, and therefore to construct a seismically isolated building on any ground. This made it possible to eliminate wasted space as much as possible. The object of the present invention is to provide a seismic isolation structure that reduces installation costs and maintenance costs, and which is easy to maintain on a regular and irregular basis.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the base isolation structure according to the present invention provides a base isolation structure in which a base isolation structure is installed in a noll space formed between a bearing plate installed on three lawns and a support of the structure. , a seismic isolation support connected to a high-pressure fluid supply device and provided with a control device for maintaining a constant gap between the bearing pressure plate and the support; and a spring interposed between the structure and the foundation. It is composed of a damping element and a damping element.

(Function) Since the present invention is configured as described above, the high pressure fluid supply device is installed in the seal space formed between the bearing plate installed on the base of the seismic isolation bearing and the support of the structure. The structure is hydraulically supported by enclosing high pressure fluid through the structure.

By sealing the high-pressure fluid in the seal space, a control device provided in the high-pressure fluid supply device is used to prevent the gap between the bearing pressure plate and the support from becoming too wide and the seal to be broken. By controlling the amount of pressure fluid flowing into the space, the distance between the support and the bearing pressure plate is maintained constant.

In this way, in the seismic isolation bearing, since only the fluid is present between the bearing pressure plate and the support of the structure, almost no frictional force acts and only the vertical force is supported. Earthquake bearings can be lowered in height, so they do not require as much installation height as laminated rubber.

Furthermore, the natural period of the seismic isolation structure is approximately determined by the spring element interposed between the structure and the foundation, and therefore, by adjusting the spring constant of the spring element, seismic isolation can be achieved on any ground. Buildings can be constructed. Further, as described above, since no frictional force acts on the seismic isolation bearing, the structure returns to its original position after the earthquake due to the spring element.

Furthermore, the damping device suppresses the opening of the seismic isolation structure by about one degree, and the shaking of the structure is quickly damped.

(Example) The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a structure in which a seismic isolation bearing a, a spring element, and a damping element C, each of which has an independent function, are interposed between the structure and the foundation.

FIGS. 3 and 4 show details of the seismic isolation bearing a, in which an air compressor 5 is placed in the seal space 4 formed between the bearing 3 installed in the structure 1 and the bearing pressure plate 2. An automatic control valve 6 is connected via an interposed air pipe 7,
The distance between the support 3 and the bearing pressure plate 2 is detected by a distance sensor 8, and this detection signal is amplified by a width amplifier 9 and sent to the automatic control valve 6, which controls the opening and closing of the opening valve 6 to close the seal. The gap in space 4 is kept constant.

The air compressor 5 and air piping 7 constitute the high-pressure fluid supply device, and the distance sensor 8, amplifier 9, and automatic control valve 6 constitute a control device that maintains a constant gap between the bearing pressure plate and the support. It is.

Reference numeral 10 denotes a ball block disposed on the outer periphery of the seal space 4. If it is difficult to manufacture a cylindrical magnet for connecting the ball blocks, a bar magnet 11 as shown is used.

In the illustrated embodiment, the device is circular, but it may also be square.

On the other hand, the magnetic fluid 12 is supplied to the periphery of the seal space 4 by a magnetic fluid replenishing device 13. Reference numeral 14 in FIG. 1 is a magnetic fluid replenishing pipe.

By constructing the bearing plate 2 of a magnetic material such as steel in the magnetic fluid sealing portion, the magnetic fluid 12 is strongly attracted to the area where the magnetic field at the edge portion of the ball block 10 is strong, and the sealing space 4 is airtight. Retained.

Further, a stopper 15 made of a viscoelastic material is provided protrudingly on the bearing pressure plate 2 at a distance from the seismic isolation bearing a.

Further, a tension coil spring constituting the spring element C is interposed between the structure 1 and the base, and a viscous damper constituting the damping element C is interposed. In the figure, 16 is a viscous body.

As shown in Figure 5, the currently implemented design of seismic isolation structures is to shift the natural period of a structure that receives a large seismic force on good quality ground to reduce the seismic input. On soft ground as shown in FIG. 6, conventional seismic isolation structures using laminated rubber are not effective, but the seismic isolation rim structure according to the present invention has been shown to be effective even on soft ground.

(Effects of the Invention) According to the present invention, as described above, a high-pressure fluid supply device is connected to the seal space formed between the bearing plate installed on the base and the support of the structure, and the supply device Since the seismic isolation bearing is provided with a control device that maintains the bearing pressure plate and the gap between the bearings constant, the fluid pressure between the bearing and the bearing pressure plate supports the vertical load of the structure. , since only fluid is present between the bearing and the bearing pressure plate, almost no frictional force acts, and it acts to support only vertical force;
Moreover, this seismic isolation support can be made low in height, and does not require as much installation height as conventional laminated rubber.

Furthermore, since it is not necessary to operate almost all the time, the capacity of the compressor for supplying pressure fluid can be small, and installation costs and maintenance costs can be reduced. On the other hand, since the seismic isolation bearing has no worn parts or deformed parts, regular or irregular maintenance is easy.

Furthermore, since a spring element is interposed between the structure and the foundation, the natural period of the seismic isolation structure is approximately determined by the spring element, and therefore, by adjusting the spring constant of the spring element, Seismic isolation structures can also be constructed on the ground.

Further, since no frictional force acts on the seismic isolation bearing, the structure can return to its original position after the earthquake due to the action of the spring element.

Furthermore, by interposing a damping element between the structure and the foundation, the glabellar displacement of the seismic isolation device floor is suppressed, and the shaking of the structure is quickly damped.

The invention according to claim 2 is characterized in that the support plate is made of a magnetic metal,
By sealing the periphery of the seal space formed between the pressure bearing plate and the support of the structure through a magnetic fluid, only fluid is present in the seal space between the pressure bearing plate and the support. Therefore, almost no frictional force acts, and only vertical force acts.Furthermore, by providing a stopper made of a viscoelastic material with a support and a gap on the bearing plate, an unexpected unexpected This is to suppress excessive deformation when it occurs.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the seismic isolation structure according to the present invention, FIG. 2 is a view taken along arrow A-A in FIG. The figure is a partial plan view of the structure, Figure 5 is a conceptual diagram of the current design of seismic isolation structures, and Figure 6 is a seismic isolation structure using conventional laminated rubber on soft ground and the seismic isolation structure of the present invention. It is a comparison diagram of the seismic isolation effects of seismic structures. a... Seismic isolation bearing, b... Spring element, C...
- Damping element, l... structure, 2... bearing plate,
3...Support, 4...Seal space, 5.
...Near compressor, 6...Automatic control valve,
7...Air piping, 8...Distance sensor, 9...
・Amplifier, 10... Ball block, 11... Bar magnet, 12... Magnetic fluid, 13... Magnetic fluid supply device, 14... Magnetic fluid supply tube, 15... Stopper, 16... ... Viscous body. Agent: Patent attorney Shige Okamoto, 1 person outside of Fumiaki I4: @ Kouj criminal supply pipe Figure 4

Claims (1)

[Claims] 1. A high-pressure fluid supply device is connected to the seal space formed between the bearing pressure plate installed on the base and the support of the structure, and the supply device is connected to the seal space formed between the bearing pressure plate installed on the base and the support of the structure. 1. A seismic isolation structure comprising: a seismic isolation bearing provided with a control device that maintains a constant gap; and a spring element and a damping element interposed between the structure and the foundation. 2. The bearing pressure plate is made of magnetic metal, and the peripheral edge of the seal space formed between the bearing pressure plate and the support of the structure is sealed via a magnetic fluid, and the bearing and the support plate are formed on the bearing pressure plate. 2. The seismic isolation structure according to claim 1, further comprising stoppers made of a viscoelastic material arranged at intervals.