JPH0623498B2 - Floor seismic isolation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a floor seismic isolation device, and in particular, during horizontal vibration, by insulating the floor from the building structure, only the building structure is vibrated to apply the vibration to the floor. Prevent vibration transmission.

[Conventional technology]

As a conventional floor seismic isolation device, there is the one described in "Yamaichi Securities System Center New Construction Dynamic Floor System Operation Manual" issued by Obayashi Corporation in February 1984. This device consists of a sliding plate placed on the upper surface of a slab forming the building frame, a bottom plate slidably placed on the upper surface, an outer cylinder fixed to the lower side of the floor, and an outer cylinder fixed to the upper side of the bottom plate. An inner cylinder that is telescopically fitted into the cylinder, a vertical coil spring that is installed inside the inner cylinder and the outer cylinder and expands and contracts in the vertical direction, and a vertical tamper installed between the outer cylinder and the bottom plate, It consists of four horizontal coil springs installed in four directions between the inner cylinder and the slab. Vertical vibrations are damped by expansion and contraction of the vertical coil springs and vertical dampers, while horizontal vibrations are suppressed by horizontal coil. It is damped by the expansion and contraction of the spring and the frictional force between the sliding plate and the bottom plate.

The vertical vibration absorbing means is actually opened 58-43434.
Japanese Patent Application Laid-Open No. 62-86265 discloses the horizontal vibration absorbing means.

[Problems to be Solved by the Invention]

However, in the prior art described in the above-mentioned instruction manual, the height of the device becomes large due to the large number of parts and the use of both the inner and outer cylinders and the vertical coil springs inside these, which increases the height of the device, and There is a problem that a large space is required under the floor, and there is a problem that the required area becomes large because the horizontal coil springs are expanded in all directions.

The above-mentioned prior art is developed under the idea of elastically supporting the floor with respect to the building frame, and isolating the floor by setting this elastic force to a predetermined value. Although it has a large and complicated structure as described above, as a result of experiments conducted by the inventors using a three-axis shaking table,
Regarding horizontal vibration, it was found that floor vibration can be prevented by simply sliding the building frame freely on the floor.
The reason is that according to the experiment using the three-axis shaking table,
At the beginning of the earthquake, a large vibration force acts on the building, and the building frame begins to slide on the floor, but the reaction force opposite to the vibration direction acts after a few seconds and the vibration force is gradually attenuated. Is. Therefore, the seismic isolation device does not need a positive damping device to damp the seismic force, and if the building frame is allowed to slide horizontally to the floor, the seismic force is transmitted to the floor. It was found that the seismic force was gradually attenuated for the above reason and the building frame returned to its original position and stood still with respect to the floor.

The present invention has been completed on the basis of such knowledge, and the present invention has a simple structure, and in particular, the size in the vertical direction can be made small, and the floor space under the floor can be made small, whereby the floor height can be made small. It is intended to be a seismic isolation device.

[Means for Solving the Problems]

The floor seismic isolation device of the present invention includes a horizontal sliding surface formed on one of both the building body side and the floor member side placed on the building body side, and the building body side and the floor member side. A sliding bearing member fixed to a side different from the side on which the sliding surface is formed and having a tip end surface slidingly contacting the sliding surface to support the load on the floor member side to the building frame side. A stopper projecting from the sliding surface so as to surround the outer periphery of the sliding bearing member at a distance, a rubber cushioning material arranged at a position on the sliding bearing member side of the stopper, and surrounded by the stopper The outer end is fixed to the side on which the sliding surface is formed of both the building body side and the floor member side, and the side on which the sliding bearing member of both is fixed. A rubber elastic thin plate having an inner end fixed thereto.

The sliding support member may be a rigid body made of metal or other material, or may be a stack of a plurality of rubber-like elastic materials and a plurality of metal plates vertically stacked.

[Action]

In normal times, the load on the floor member side is supported on the building body side by the sliding bearing member, and the friction bearing force between the tip end surface and the sliding surface of the sliding bearing member both unites them in the horizontal direction. When the building vibrates in the horizontal direction due to the seismic force, when the seismic force is small and the vibrating force is less than the frictional force between the sliding surface and the sliding support member tip surface, the floor member side and the building body side are still Although they are integrated in the horizontal direction, when the seismic force is large and the vibration force exceeds the frictional force, slippage occurs between the sliding surface and the tip surface of the sliding support member, and the building frame side vibrates while the floor Vibration is not transmitted to the member side. Therefore, the building body side vibrates, but the floor member side is isolated. Here, since the transmission of the vibration force is blocked by slippage, the floor member does not resonate.

At this time, when the amount of movement of the building body side with respect to the floor member side is large, the sliding bearing member contacts the stopper to regulate the relative movement amount. Here, since the cushioning material is arranged on the inner circumference of the stopper, it is cushioned by the impact of the sliding bearing member on the stopper, and thus vibration on the floor member side is prevented.

When the sliding bearing member and the sliding surface relatively slide due to the vibration, the rubber elastic thin plate partially expands and contracts, and a restoring force of the relative position between the sliding bearing member and the sliding surface acts. To do. Both of them which are relatively vibrated by the seismic force are restored to the positions before the occurrence of the earthquake at the end of the vibration, but the restoring force of the rubbery elastic thin plate assists the restoration of the two which are relatively vibrated. Further, since the rubber elastic thin plate covers the area surrounded by the stopper, it forms a dust cover for the sliding surface. Therefore, in order to prevent dust from adhering to the sliding surface, the sliding performance of the sliding surface is always maintained in the same state.

When the sliding bearing member is a rigid body made of a metal or other material, the seismic force is small, and the sliding force is not caused by the frictional force between the tip surface and the sliding surface of the sliding bearing member. At times, this vibration force is transmitted to the floor member side. In this way, when a small vibration force is allowed to be input on the floor member side, the sliding bearing member may be a rigid body. Further, when this is constructed by stacking a plurality of rubber-like elastic materials and a plurality of metal plates in the vertical direction, the sliding bearing member is elastically deformed even if no slip occurs between it and the sliding surface. Since the vibration is absorbed by, the vibration input to the floor member side is suppressed. When the rubber elastic body is laminated, the expansion and contraction also absorbs the vertical vibration.

The frictional force between the sliding surface and the tip surface of the sliding bearing member is set according to the conditions such as the magnitude of the vibration force for seismic isolation and the mass of the floor member side. Or by selecting the contact area. In addition, it has been found from the above experiment that the amount of sliding of the sliding bearing member with respect to the sliding surface is ± 150 mm (amplitude is 300 mm), which is sufficient in an expected earthquake.

Further, in the present invention, the contact between the building body side and the floor member side,
Since there is a sliding contact between the sliding surface and the front surface of the sliding bearing member, frictional force acts between them, so that a horizontal force is applied to the floor when cargo is carried into the floor or a person walks. Does not cause the floor to move, nor does it generate noise when the slip occurs due to seismic force.

〔Example〕

FIG. 1 is an exploded perspective view showing an entire embodiment of the present invention, and FIG. 2 (a) is an enlarged cross-sectional view of a main part thereof. here,
1 shown in FIG. 2 (a) is a slab which is a part of the building frame, and the slab 1 is omitted in FIG.

A sliding plate 2 is fixed to the upper surface of the slab 1, and the surface of the sliding plate 2 forms a horizontal sliding surface 3 having a small friction coefficient, but a plate or film having a specific friction coefficient is arranged on the surface of the sliding plate 2. The surface may be used as the sliding surface 3. For example, it is a film made of an ethylene tetrafluoride resin or a film made of a resin in which graphite, glass fiber, iron dioxide or the like is mixed. The sliding surface 3 of the sliding plate 2 has an inner diameter of about 360 mm and a height of 50 mm.
A ring-shaped stopper 4 of a certain degree is fixed, and a rubber-made cushioning material 5 is arranged on the inner circumference of the stopper 4.

Reference numeral 6 denotes a floor member, which is composed of parallel girders 7, a plurality of beam girders 8 erected between the girders 7, and a floor panel 10 arranged on these girders 9 through a large number of columns 9. Member 6
An electronic calculator 11 is mounted on the upper surface of the computer in this embodiment. Since the electronic computer 11 generally has a fail-safe function so as to stop at 200 (± 30) gal, in this embodiment, the sliding surface 3 slides against the sliding support member 13 due to the vibration force of 100 gal as described later. It is configured to start.

On the lower surface of the plate member 12 fixed to the lower surface of the floor member 6, a slide bearing member 13 is fixed at its flange portion by a fixing tool such as a bolt. The sliding bearing member 13 has an overall height of about 50 to 100 mm, and the tip end surface is on the sliding surface 3,
The surface is in sliding contact, and has a cylindrical shape with a diameter of about 60 mm on the lower side of the flange portion, and contacts the sliding surface 3 at the inner center of the stopper 4. Thus, there is a space of about 150 mm between the outer circumference of the sliding bearing member 13 and the inner surface of the stopper 4. Further, since the height of the sliding bearing member 13 is the above-mentioned level, the height of the seismic isolation device in this embodiment is obtained by adding the height of the sliding plate 2 to this. If the height of the sliding plate 2 is 20 mm, the height of the seismic isolation device is about 70 to 120 mm.

An elastic thin plate 1 made of rubber is provided between the outer circumference of the stopper 4 (may be the upper surface) and the outer circumference of the flange portion of the slide bearing member 13.
4 is stretched over, so that the inside of the stopper 4 is covered. The elastic thin plate 14 has an umbrella shape in this embodiment, and the boss portion on the center side thereof is externally fitted to the sliding support member 13 and the outer peripheral side thereof is externally fitted to the stopper 4. The elastic thin plate 14 may be fixed to the plate member 12 on the floor member 6 side, and may be fixed to the sliding surface 3 outside the stopper 4 on the slab 1 side.

Since the elastic thin plate 14 does not have a function of positively damping the vibration, the spring constant at the time of the movement is made small so that the resistance force of the movement of the slide bearing member 13 to the slide surface 3 does not become large. I am doing it.

In addition, between the both ends of the parallel girders 7 constituting the floor member 6,
A bending plate 15 whose center is recessed downward is arranged, a cable 16 for feeding or transmitting is inserted into the recess, and the recess is flush with the upper surfaces of the other girders 7 and girders 8. The horizontal plate 17 is detachably installed. By disposing the cable 16 in the concave portion, a distance between the electronic computer 11 and the cable 16 is secured, thereby preventing malfunction of the electronic computer 11 due to noise, and bending the cable 16 toward the electronic computer 11. The radius of curvature can be increased to facilitate the wiring of the optical communication cable.

In FIG. 1, reference numeral 18 denotes a tray for winding and storing the cable 19, which is made of a material having a high electric insulating property or an electromagnetic wave shielding property, and is placed between the beam members 8. Also, 20 and 21 are trays similar to the tray 18, and a centralized outlet 22 and a modulator / demodulator 23 of the electronic computer 11 are arranged respectively.

Further, in order to allow the cables 16 and 19 to pass on the upper surface of the floor panel 10, the floor panel 10 is formed with a recessed portion 10a.

The seismic isolation device as described above is arranged at the four corners of the lower surface of the floor member 6 in this embodiment. The number and position shall be selected appropriately.

Next, the operation of the seismic isolation device will be described.

During normal times when no earthquake occurs, the load on the floor member 6 side is supported by the slab 1, which is the building frame side, by the sliding bearing member 13, and the friction between the tip surface of the sliding bearing member 13 and the sliding surface 3 is caused. Both are united in the horizontal direction by the force. When the building vibrates in the horizontal direction due to the seismic force, when the seismic force is small and the vibrating force is below the frictional force between the sliding surface 3 and the tip end surface of the sliding bearing member 13, the floor member 6 side and the slab are still in contact. Although the first side is integrated in the horizontal direction, when the seismic force is large and the vibration force exceeds the frictional force, slippage occurs between the sliding surface 3 and the tip end surface of the sliding support member 13, and the slab 1 While the side vibrates, the vibration is not transmitted to the floor member 6 side. Therefore, although the slab 1 side vibrates, the floor member 6 side is isolated. Therefore, the vibration force is not transmitted to the electronic computer 11 installed on the upper surface of the floor member 6. Here, since the transmission of the vibration force is blocked by the slip, the floor member does not resonate. Further, since the tip end surface of the sliding support member 13 is in surface contact with the sliding surface 3, a frictional force acts on the sliding support member 13, so that the sliding does not occur even with a small vibration. Therefore, the slip does not occur even when a horizontal force is applied to the floor member 6 when a person walks on the floor member 6 or when equipment is loaded. In this respect, the floor member 6 does not move excessively even with a small horizontal force as in the case where a rolling contact component is interposed between the floor member 6 side and the slab 1 side.

The computer 11 that can be installed on the floor is
In general, the fuel safety operates so as to be stopped by the vibration of about 200 gall (± 30 gall).
Sliding is caused between the tip surface of the sliding bearing member 13 and the sliding surface 3 due to a vibration of about 100 gal or more. In addition,
The seismic power that causes this slip is set according to the type of equipment installed on the floor member 6.

At this time, when the amount of movement of the slab 1 with respect to the floor member 6 is large, the sliding support member 13 contacts the stopper 4 to regulate the relative movement. Here, since the cushioning material 5 is arranged on the inner circumference of the stopper 4, the elastic deformation thereof reduces the impact of the sliding support member 13 on the stopper 4 and prevents the floor member 6 from vibrating.

Further, when the sliding bearing member 13 and the sliding surface 3 relatively slide due to the vibration, the elastic thin plate 14 expands and contracts, and a restoring force of the relative position between the sliding bearing member 13 and the sliding surface 3 is generated. Both of which relatively vibrate due to the seismic force restore to the position before the occurrence of the earthquake at the end of the vibration, but the restoring force of the rubber elastic thin plate 14 assists the restoration of both relatively vibrating. Promotes restoration of relative position.

Furthermore, since the elastic thin plate 14 covers the portion of the sliding surface 3 surrounded by the stopper 4, it forms a dust cover for the sliding surface 3. Therefore, the sliding performance of the sliding surface 3 is always maintained in the same state in order to prevent dust from adhering to the sliding surface 3.

When the slide bearing member 13 is made of a metal or other rigid body, when the seismic force is small and the frictional force between the tip surface of the slide bearing member 13 and the sliding surface 3 does not cause slippage between the two, The vibration force is transmitted to the floor member side. When a small vibration force is allowed to be input on the floor member side as described above, the sliding support member 13 may be a rigid body.

When the sliding bearing member 13 is formed by vertically stacking a plurality of rubber elastic bodies and a plurality of metal plates, the sliding bearing member 13 does not slip between the sliding surface 3 and the sliding surface 3. Moreover, since the elastic deformation absorbs the vibration, the vibration input to the floor member 6 side is suppressed. When the rubber elastic body is laminated, the expansion and contraction also absorbs the vertical vibration.

The stopper 4 of this embodiment is fixed to the sliding plate 3 by a known fixing means, and the cushioning material 5 is fixed to the stopper 4 by a known fixing means.
As shown in FIG. 2 (b), the sliding plate 3 and the stopper 4 may be integrally formed, or
As shown in FIG. 2 (c), the stopper 4 may be formed of a rubber elastic body so as to be integrated with the cushioning material 5.

Further, the elastic thin plate 14 of the above-mentioned embodiment has a smooth portion between the mounting portion on the side of the floor member 6 and the mounting portion on the side of the slab 1, but it may be formed into a bellows as shown in FIG. it can. By forming the bellows in this manner, it is possible to reduce the spring constant of the elastic thin plate 14 during the sliding movement of the sliding surface 3 with respect to the sliding bearing member 13.

Further, by selecting the shape of the cushioning material 5 of the stopper 4 from those shown in FIG. 4, the cushioning function can be set arbitrarily. Fig. 4 (a) (b) (c)
Sets the cushioning function only from the shape of the cushioning material 5,
In the case of FIG. 4 (d), an air reservoir 5a is provided inside the cushioning material 5 and a throttle 5b is provided to connect this to the outside, and when the sliding bearing member 13 hits, the air reservoir 5a expands and contracts to the outside. The air flows in and out between and, and at that time, an attempt is made to obtain a damping force by the throttle action of the throttle 5b.

In the above description, the sliding surface 3 is formed on the slab 1 forming the building frame, and the sliding support member 13 is provided on the floor member 6 in a protruding manner. However, the relationship between the sliding surface 3 and the sliding support member 13 is changed up and down. Conversely, even if the sliding surface 3 is provided downward on the floor member 6 and the sliding support member 13 is provided so as to project upward on the slab 1, the same effect as above can be obtained. Further, not only the electronic computer 11 is installed on the upper surface of the floor member 6, but various machines or instruments such as arts and crafts or fragile products which are not desired to be vibrated can be installed.

〔The invention's effect〕

As described above, according to the present invention, the vibration to the floor member is generated by freely sliding the building frame in the horizontal direction with respect to the floor without providing an active damping mechanism for damping the seismic force. Since the transmission is blocked and the vibration is damped by the stopper and the cushioning material only when the amplitude exceeds a predetermined value, the structure is simplified and the seismic isolation device can be downsized. Therefore, there is an effect that it is possible to reduce the floor height to lower the floor height. In addition, the elastic thin plate promotes the restoration of the positions of the sliding surface and the sliding bearing member, and since the sliding surface is dust-proof, the sliding surface can be maintained at the same frictional force at all times. There is also an effect that can be maintained for a long period of time. Further, according to the present invention, since the sliding contact is made between the sliding surfaces and the leading end surface of the sliding bearing member, a frictional force acts between the sliding surfaces and the sliding bearing member, so that the cargo is carried into the floor or the person Even if a horizontal force is applied to the floor due to walking, the floor does not vibrate in the horizontal direction, and no noise is generated even when the slip due to the seismic force occurs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG.
(a) is a sectional view of an essential part of FIG. 1, FIGS. 2 (b) and (c) are sectional views showing another example of a stopper, and FIG. 3 is a sectional view showing another example of an elastic thin plate. (A)-(d) is a cross-sectional partial view showing an example of the cushioning material. 1 ... Slab (building frame), 2 ... Sliding plate, 3 ... Sliding surface, 4 ... Stopper, 5 ... Buffer material, 6 ... Floor member, 7
...... Large beam, 8 ... Small beam, 10 ... Floor panel, 11 ... Computer, 13 ... Slip support member, 14 ... Elastic thin plate.

Claims (3)

[Claims] 1. A horizontal sliding surface formed on one of a building frame side and a floor member side mounted on the building frame side, and both of the building frame side and the floor member side. A sliding bearing member fixed to a side different from the side on which the sliding surface is formed and having its tip end surface slidably contacting the sliding surface to support the load on the floor member side to the building frame side, and this sliding bearing. A stopper provided so as to surround the outer periphery of the member with a gap and projecting from the sliding surface, a rubber cushioning member arranged at a position on the sliding bearing member side of the stopper, and an area surrounded by the stopper The outer end is fixed to the side on which the sliding surface is formed, of both the building body side and the floor member side, and the inner end is fixed to the side on which the sliding bearing member is fixed. Floor seismic isolation device, comprising: 2. The floor seismic isolation device according to claim 1, wherein the sliding bearing member is a rigid body made of metal or other material. 3. The floor seismic isolation device according to claim 1, wherein the sliding bearing member is formed by vertically stacking a plurality of rubber-like elastic members and a plurality of metal plates.