JPH0356332B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is applicable to highly public information equipment, confidential equipment such as electron microscopes, other cultural properties, and valuable articles and equipment such as durable consumer goods for ordinary households. This relates to an impact force absorbing device.

(Prior Art) Conventionally, this type of impact force absorbing device has a shock absorbing device such as an oil damper interposed between a structure and a foundation, and the impact force applied to the structure is absorbed by the volume of oil and fat in the impact member. It was absorbed through change.

(Problems to be Solved by the Invention) The impact force absorbing device has problems such as a small change in volume of oil and fat when impact force is applied to a structure, and slow operation.

(Means for Solving the Problems) The present invention has the characteristic that when an aggregate of micro hollow vacuum glass spheres receives an impact force of a predetermined load or more, about 10% or more of the volume of the aggregate decreases instantaneously. This was proposed with a focus on the above-mentioned problems by inserting a piston protruding from the load-bearing member of the structure into a pressure chamber filled with a micro-decompression hollow body. It is something.

(Function) Since the impact force absorption device for a structure according to the present invention is configured as described above, when impact force is transmitted from the foundation to the device of the present invention during an earthquake, etc.,
In this device, the volume of a minute decompression hollow body in a pressure chamber into which a piston protruding from the load-bearing member of a structure is fitted decreases instantaneously, the piston retracts into the pressure chamber, and an impact force is applied to the structure. is absorbed.

(Effects of the Invention) As described above, in the present invention, the volume reduction rate upon impact is dramatically higher than that of the oils and fats used in the conventional impact force absorbing device, and the volume reduction is instantaneous. By filling the pressure chamber with a hollow body for minute decompression, and inserting a piston protruding from the load bearing member of the structure into the pressure chamber, the impact force transmitted from the foundation to the structure can be reduced. It can absorb and protect structures from impact forces more quickly and effectively than conventional devices.

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

In FIG. 1, 1 is a load bearing member of a structure (not shown) such as important equipment, and a load transmitting piston 2 hanging vertically from the member 1 is connected to a pressure chamber 4 (described later) formed on a foundation 3. inserted into.

The pressure chamber 4 is formed by a concave hole in the upper surface of a rigid lower jig 5 installed on the foundation 3, and the inside thereof is filled with a microscopic hollow glass sphere 6 as a microscopic decompression hollow body.

The micro hollow glass spheres 6 are particles with a diameter of 10 to 100 microns, and are manufactured as an admixture for hydrous explosives, etc. When subjected to an impact force, they instantly lose about 10 of their volume.
It has the property of absorbing 60-70% of the impact force.

As the micro hollow glass spheres, for example, "3M Glass Bubbles" (trade name) manufactured by Sumitomo 3M Limited is used as a commercially available product. Further, instead of the glass bulb, a micro hollow acrylic bulb can be used.

A strong upper jig 7 is screwed onto the lower jig 5, and is provided on the upper jig 7 and is connected to the pressure chamber 4.
The piston 2 is inserted into a vertical through hole 8 that communicates with the piston 2.
is inserted into the pressure chamber 4.

9 in the figure shows the piston 2 and the micro hollow glass bulb 6.
10 is an O-ring.

Impact force absorbing device A for structures shown in the illustrated embodiments
is configured as described above, so that in the event of an earthquake, etc., the micro hollow glass sphere 6 in the pressure chamber 4
When the assembly receives an impact of more than a predetermined load, about 10% or more of the volume of the assembly instantly decreases, and the piston 2 is drawn into the pressure chamber 4, causing the structure to be removed from the foundation 3. The transmitted impact forces are absorbed and the structure is protected from the impact forces.

At this time, it is necessary to design in advance the relationship between the load loaded on the piston 2 and the pressure at which the micro hollow glass sphere 6 starts to decrease in volume.

As described above, according to the embodiment, the volume reduction rate is much higher than that of oils and fats used in conventional shock absorbing devices, and the volume reduction is instantaneous. By inserting into the pressure chamber 4 the load transmitting piston 2 which is vertically installed from the load bearing member 1 of the structure, the impact force transmitted from the foundation 3 to the structure can be transmitted more quickly and efficiently than the conventional device. It effectively absorbs and protects structures from impact.

FIG. 2 shows another embodiment of the present invention, in which a load bearing member 1 provided as a preliminary load under a structure B such as important equipment is inserted into a pit 11 provided in a foundation 3. The impact force absorbing device A is interposed between the outer surface and the bottom surface, and between the side surface and the bottom surface of the pit 11, and is configured to absorb impact forces in both horizontal and vertical directions.

After the impact force absorption device A absorbs the impact force applied from the foundation to the structure B during an earthquake, etc., the structure B and the load bearing member 1 are jacked up, and each of the devices A is subjected to a new impact force. Replace with absorber.

In the figure, 12 is the floor.

FIG. 3 shows another embodiment of the invention, structure B
Load bearing member 1 as a preliminary load provided at the bottom of
is extended to the outside of the structure B, and a level adjuster 14 is screwed into the center screw hole of the lid piece 13 screwed into the screw hole provided in the extension part, and the level adjuster 14 is
It is supported via a ball bearing 16 on the piston 2 inserted into the pressure chamber of the impact force absorbing device A installed at the bottom of a small pit 15 provided on the foundation 3. Applicable when absorbing impact force due to motion.

In the figure, reference numeral 16 denotes a temporary mounting jack attached to the load bearing member 1, which is used when replacing the impact force absorbing device A.

FIG. 4 shows another embodiment of the present invention, in which micro hollow glass spheres 6 are directly filled into a pit 11 that is provided on a base 3 and constitutes a fluororesin cylinder whose inner peripheral surface is coated with a fluororesin 17. At the same time, structure B
A load supporting member 1 that also serves as a piston is inserted into the lower part of the piston, and is applied when the purpose is to absorb vertical movement during a huge earthquake.

In the above embodiment, the load bearing member 1,
If there is a gap between the 17 layers of fluororesin and the foundation 3, there is a problem that the load bearing member 1 will become unstable. It has the advantage of not requiring refilling.

FIG. 5 shows still another embodiment of the present invention, in which a bottom plate 20 is constructed between steel rods 19 suspended from an arch or dome 18 erected on a foundation 3,
An upper floor plate 21 into which the steel rod 19 is loosely inserted and a lower floor plate 23 fitted into a pit 22 provided in the foundation 3 are loosely inserted into the ceiling 24 and connected by steel rods 25 or wires, and the lower floor plate A structure B such as important equipment is mounted on the board 23, and the impact force absorbing device A is interposed between the bottom board 20 and the upper floor board 21.

In the figure, 26 is a vibration-proof rubber provided on the inner peripheral surface of the pit 22.

The above-mentioned embodiment is mainly applied to absorb impact force in the vertical direction, but it is also possible to absorb a certain degree of impact force in the horizontal direction.

Figure 6 is a chart showing the impact absorption effect of a micro hollow glass sphere aggregate, where the vertical axis shows the load (force) applied to the micro hollow glass sphere aggregate, and the horizontal axis shows the load (force) applied to the micro hollow glass sphere aggregate. ) indicates the time during which it takes effect.

P indicates the load (force) that is the boundary between whether the micro hollow glass sphere aggregate causes a volume change or not,
This is determined by the type of glass bulb.

The pressure chamber is designed so that the load Q placed on the micro hollow glass sphere aggregate filled in the pressure chamber is slightly lower than P.

R is the impact force actually transmitted to the aggregate during an earthquake, etc., and the moment the impact force exceeds P, the volume of the aggregate decreases, and the impact force quickly decreases as shown by the solid line. Effectively absorbed.

As a control example, S is the impact force transmitted when an oil or fat with a small volume reduction is used instead of the aggregate of micro hollow glass spheres, which is much larger than R, and in this case, the impact force is absorbed as shown by the broken line. It takes time.

[Brief explanation of drawings]

1 to 5 are longitudinal cross-sectional views showing each embodiment of the impact force absorbing device for a structure according to the present invention, and FIG. 6 is a chart showing the impact absorption effect of a micro hollow glass sphere aggregate. A... Shock force absorbing device, B... Structure, 1... Load bearing member, 2... Piston, 4... Pressure chamber, 6... Microscopic hollow glass sphere.

Claims (1)

[Claims] 1. An impact force absorbing device for a structure, characterized in that a piston protruding from a load bearing member of the structure is inserted into a pressure chamber filled with a minute decompression hollow body.