JPH02209526A - Anti-seismic mechanism of building - Google Patents

Abstract

PURPOSE:To shut off vibration by installing a number of air bearings under the borne part of a building, sending high compressed air to these air bearings from a compressor in the event of an earthquake, and putting the borne part afloat in the air. CONSTITUTION:A groove 4 is formed in the undersurface of a foundation slab 3 of building mass 2, and air bearings 6 installed on a plate 5 are slipped into this groove 4. These bearings 6 are connected with a compressor 12 through a flexible hose 11, and output from a seismic sensing device is introduced to a computer, and a valve 13 is controlled. When an earthquake has occurred, the valve 13 is opened with the output from sensing, and the air in an air receiver 14 is released, and air is jetted out of the bearings 6, and by this pressure the whole mass 2 is put afloat from the foundation 1. Thus vibration is shut, and flame damage, etc., of building can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolation mechanism for a building that can isolate vibrations when an earthquake occurs.

[Conventional technology]

Conventionally, in the seismic design of high-rise buildings and important structures, dynamic design has been performed to check safety by calculating the ground movement and building response during an earthquake.

Earthquake resistance methods include seismic isolation or seismic attenuation construction methods in which laminated rubber bearings or dampers are interposed between the building and the foundation, methods to consume earthquake energy by destroying non-main building components, and walls. Another method is to create slits in pillars, etc., and adjust the building's rigidity to the optimum level.

[Problem to be solved by invention C] By the way, confirmation of the safety of buildings designed using current seismic design methods in the event of an earthquake is based on earthquakes in which absorbed energy due to the hysteresis characteristics accompanied by plasticization of the structure acts on the structure. This is based on the basic idea of exceeding energy, but this has the problem of reliability regarding the hysteresis loop characteristics.

In addition, all conventional methods provide a passive earthquake-resistant structure against natural external forces such as earthquakes and wind, but because buildings have a characteristic natural frequency, they cannot resist resonance phenomena in response to an uncertain input such as an earthquake. You cannot avoid it.

The purpose of the present invention is to eliminate the above-mentioned disadvantages of the conventional example, to significantly reduce the response to earthquakes, to prevent earthquake disasters in buildings, and to protect people and machinery inside from earthquake-induced discomfort, vibration damage, etc. The objective is to provide a seismic isolation mechanism for buildings that can be protected.

[Means to solve the problem]

In order to achieve the above object, the present invention installs a large number of air bearings, each of which is made of a metal disc body to which a high-pressure compressed air supply pipe is attached and has a membrane skirt part, arranged at appropriate intervals under the supported part of the building. The gist of this system is to send high-pressure compressed air from a compressor to the air bearing to levitate the supported part from the supporting part into the air when an earthquake occurs.

[Effect]

According to the present invention, when high-pressure compressed air is sent into the air bearing through the inlet pipe when an earthquake occurs, the air accumulates inside the skirt of the air bearing and blows out from the lower end to exert a lifting effect.

In this way, the supported part of the building is separated from the supported part and slightly floated by the large number of air bearings, so that the shaking of the earthquake is not transmitted from the supported part to the supported part.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a vertical side view showing a first embodiment of the seismic isolation mechanism for a building according to the present invention, and Fig. 2 is a cross-sectional plan view of the same. It is a building rectangle as parts, and these parts are joined so that they can be divided.

Grooves 4 are formed at appropriate intervals on the lower surface of the foundation slab 3 of the building frame 2, and two air bearings 6 attached to a plate 5 are slid into the grooves 4 from the side surface together with the plate 5.

4 and 5 show details of the air bearing 6, in which a skirt portion 8 formed by bending a urethane film is provided on the lower surface of a metal disk body 7 made of an oval steel plate, and a skirt portion 8 made of metal A high-pressure compressed air supply pipe 9 made of steel was attached to the upper surface of the panel body 7.

In the figure, reference numeral 10 denotes a steel plate that fixes the center of the urethane film, whose periphery is fixed around the metal disk 7 with slack, to the center of the lower surface of the metal disk 7.

FIG. 3 is an explanatory diagram showing the principle of the air bearing 6. A compressor 12 is connected to the inlet pipe 9 via a flexible hose 11, and if high-pressure compressed air is sent from the compressor 12, a portion of this air can be is metal board 7
and the urethane film and inflates the urethane film to form the skirt portion 8.

Further, the high-pressure compressed air accumulates in the lower part of the urethane film, that is, in the skirt part 8, and is blown out from the lower end of the skirt part 8, thereby floating the air bearing 6 by about 0.003 m.

In the present invention, a large number of such air bearings 6 are connected by flexible hoses 11 and connected to a compressor 12 via a valve 13 and an air receiver 14.

Although not shown in the drawings, earthquake sensing devices are placed in both narrow and wide areas around buildings, and observation data from the earthquake sensing devices is transmitted to the computer via wired and wireless communication networks. In that case, the wide-area earthquake sensing equipment is connected to seismometers at existing earthquake observation points or specially installed equipment via micro-wires or telephone lines. In addition, narrow-area earthquake sensing devices consist of seismometers installed around buildings or in the surrounding ground, and vibration sensors installed at the base of buildings or inside buildings.

In this way, the output from the earthquake sensing device is introduced into the computer and via the computer the air receiver 1
4 and valve 13.

Next, the usage and operation will be explained. Normally, the air bearing 6 does not operate, the foundation slab 3 is joined to the foundation 1, and the building frame 2 remains stationary.

When an earthquake occurs and an earthquake sensor detects this earthquake,
An instruction is issued to open the valve 13 of the computer air conditioner blazer 12, and the air in the air receiver 14 flows out instantly, injecting air from the air bearing 6 installed between the building frame 2 and the foundation 1. The pressure causes the entire building frame 2 to float above the foundation 1.

After the earthquake ends, air bearing 6 will no longer operate.
The building frame 2 returns to its original state.

Note that when inspecting or repairing the air bearing 6, it is sufficient to pull out the entire plate 5 from the groove 4.

In the above embodiments, the case where the entire building frame 2 is made to float has been described. It is also possible to raise only a portion of the floor, that is, a part of the building.

〔Effect of the invention〕

As described above, the building seismic isolation mechanism of the present invention allows the supported parts of the building to rise above the supporting parts when an earthquake occurs, thereby blocking the input earthquake, thereby significantly reducing the response of the building. In addition to preventing earthquake disasters, it can also protect the people living inside and machinery and equipment from discomfort and vibration disturbances caused by earthquakes.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view showing one embodiment of the building seismic isolator of the present invention, Fig. 2 is a cross-sectional plan view of the same, Fig. 3 is an explanatory diagram showing the principle of air bearing, and Fig. 4 is an air bearing. A plan view of the bearing, FIG. 5 is a sectional view taken along the line A--A in FIG. 4.

Claims (3)

[Claims] (1) A large number of air bearings, which are made of a metal plate with a membrane skirt attached to a high-pressure compressed air supply pipe, are placed under the supported parts of the building at appropriate intervals, so that they can be used in the event of an earthquake. A seismic isolation mechanism for buildings that is characterized by sending high-pressure compressed air from a compressor into an air bearing to levitate the supported part from the supporting part into the air. (2) The seismic isolation mechanism for a building according to claim 1, wherein the supported part of the building is a foundation slab, the supporting part is a foundation, and the entire building is floated. (3) The seismic isolation mechanism for a building according to claim 1, wherein the supported part of the building is a floor, and the supported part is a building frame relative to this floor, and the floor is floated.