JP2010183993A - Earthquake isolation structure of hanger for furniture or machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage of furniture or machinery by vibration of earthquakes or the like. <P>SOLUTION: A beam member 2 is fixed to a ceiling slab 11 of a construction 10 and a rack 3 is supported while being hung from the beam member 2 via a hanging member 4. The hanging member 4 includes a hanging fulcrum 5 of a pin structure fixed to the beam member 2 and a connecting member 6 for connecting the hanging fulcrum 5 and the rack 3. The rack 3 enables pendulum motion with the hanging fulcrum 5 as a fulcrum, and has a space between itself and a double floor 13 therebelow. The length of the connecting member 6 is adjusted to set the length L from the hanging fulcrum 5 to the center of gravity G of the rack 3 so that the natural period of the hung rack 3 is out of a predominant period bandwidth of an earthquake. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation structure for reducing vibrations of fixtures or equipment installed in a structure due to an earthquake or the like.

Conventionally, furniture and equipment are reinforced with earthquake resistance so that indoor furniture and equipment are vibrated due to earthquakes, etc., and are not moved and fallen.
For example, a method of firmly fixing furniture, equipment, and the like to a building frame such as a pillar or beam of a building, a wall, or a floor using, for example, a hardware such as a bolt.
In addition, furniture and equipment and the like are prevented from moving and falling using the frictional force between the floor and the bottom of the furniture and equipment and the like arranged on the floor. In addition, furniture or equipment that installs a fall-prevention sheet, such as a rubber-like sheet, between the furniture and equipment and the floor to increase the frictional force between the bottom of the furniture and equipment and the floor The movement prevention of the equipment etc. and the fall prevention are also performed.
In addition, as shown in FIG. 6, a seismic isolation device 33 having a sliding support or the like is installed between the fixture 31 and the floor 32 to block vibration transmitted from the floor 32 to the fixture 31. For example, Patent Document 1 proposes a base isolation table that can be easily attached between a base portion of an existing rack and a floor of a structure. According to this base isolation table, since the floor and the rack can be moved relative to each other, it is possible to suppress the vibration caused by the earthquake from acting on the rack.

JP 2001-61579 A

However, the conventional seismic reinforcement applied to furniture and equipment has the following problems.
In the method of fixing furniture and equipment to the chassis using hardware, etc., if an earthquake occurs, the vibration of the furniture and equipment will be large as well as the cabinet, so the structure of the furniture and equipment will be strong. There was a problem that had to be done. Moreover, the thing accommodated in the furniture may be damaged by a big vibration.
In addition, in the method of preventing the fall by the friction force generated between the floor and furniture or equipment, the magnitude of the seismic force may exceed the friction force and the furniture or equipment may fall and be damaged. It was.
Further, in the method of installing the seismic isolation device 33 between the fixture 31 and the floor 32, the seismic force generated in the fixture 31 can be reduced. For example, when a cable 34 or the like is wired below the fixture 31 The seismic isolation device 33 reduces the wiring installation space. Further, in order to prevent the cable 34 and the seismic isolation device 33 from being buffered when the fixture 31 and the floor 32 move relative to each other due to an earthquake, etc. There has been a problem that the space has to be reduced or a wiring installation space cannot be provided.

  The present invention has been made in view of the above-described problems, and suppresses vibrations of furniture and equipment due to earthquakes and the like, and objects contained in furniture, and efficiently prevents damage due to falls and movements. Moreover, when furniture and equipment have wiring, it aims at providing the seismic isolation structure of the fixture or equipment which can ensure the wiring installation space which can install this wiring.

In order to achieve the above object, the hanging seismic isolation structure for fixtures or equipment according to the present invention is a seismic isolation structure for reducing vibrations such as earthquakes occurring in fixtures or equipment arranged in the structure. Thus, the fixture or equipment is suspended and supported by the suspension member from the structure or the member fixed to the structure, and the length of the suspension member is adjusted so that the natural period of the fixture or equipment is separated from the dominant period band of earthquake motion. The length between the center of gravity of the fixture or the equipment from the suspension fulcrum is set so as to come off.
In the present invention, the natural period of the fixture or equipment is set so as to be out of the dominant period band of the earthquake motion, so that the vibration of the fixture or equipment caused by the earthquake can be suppressed, and the damage of the fixture or equipment caused by the earthquake can be prevented. Can be prevented.

In addition, in the hanging seismic isolation structure for furniture or equipment according to the present invention, the equipment or equipment may be suspended and supported from a beam member fixed to the ceiling slab of the structure.
In the present invention, since the beam member is fixed to the ceiling slab of the structure, it can be stably supported by the beam member even when the load of furniture or equipment is heavy.

Moreover, in the hanging seismic isolation structure for furniture or equipment according to the present invention, the equipment or equipment may be supported by being suspended from a beam member erected on a pillar member erected on a floor slab of the structure. .
In the present invention, since the beam member is erected on the column member erected on the floor slab of the structure, the duct or electric wiring of the air conditioning equipment is disposed under the ceiling slab, and the beam member is provided on the ceiling slab. Even if it cannot be fixed, the fixture or equipment can be hung from the beam member installed on the column member.

Moreover, in the suspension isolation structure for fixtures or equipment according to the present invention, a plurality of fixtures or appliances having different shapes or weights are adjusted to have the same length between the center of gravity from the suspension fulcrum. .
In the present invention, by making the length between the centers of gravity of the plurality of fixtures or devices having different shapes and weights from the suspension fulcrum, the natural periods of the plurality of fixtures or devices become equal, The devices can be arranged in parallel because they are not displaced and buffered at the same period when vibration is generated by an earthquake or the like.

Further, in the hanging seismic isolation structure for fixtures or equipment according to the present invention, the fixtures or equipment has wiring such as electric cables, and wiring is performed between the hanging fixtures or equipment and the floor of the structure. The installation space can be secured.
In the present invention, a fixture or equipment is suspended and supported by a suspension member and floats from the floor surface, and a wiring installation space can be provided between the fixture or equipment and the floor. Wiring is easier to perform than the base isolation structure.

According to the present invention, since fixtures or equipment are supported by suspension from a suspension fulcrum disposed on a structure or a member fixed to the structure, vibrations generated in fixtures or appliances due to earthquakes or the like are suppressed. Can be realized.
Moreover, since a wiring installation space can be secured in the space between the fixture or equipment and the floor of the structure, the usability of the fixture or equipment can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows an example of the suspension type seismic isolation structure of the fixture and apparatus by 1st embodiment of this invention, (b) is the sectional view on the AA line of the schematic shown to (a). It is the schematic which shows an example of the hanging seismic isolation structure of the fixture and apparatus by 2nd embodiment of this invention. It is the schematic which shows an example of the hanging seismic isolation structure of the fixture and apparatus by 3rd embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the modified example of the suspension type seismic isolation structure of the fixture and apparatus by 1st embodiment of this invention, (b) is BB sectional drawing of the schematic shown to (a). BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the other modification of the fixture by the first embodiment of this invention, and the suspension seismic isolation structure of apparatuses, (b) is CC sectional view taken on the line of the schematic shown to (a). It is the schematic which shows the seismic isolation structure of the conventional fixture.

  Hereinafter, a hanging seismic isolation structure for a fixture or equipment according to a first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

As shown in FIGS. 1 (a) and 1 (b), in the hanging seismic isolation structure 1a for furniture or equipment according to the first embodiment, a beam member 2 is fixed to a ceiling slab 11 of a structure 10 such as a building, for example. Thus, the rack 3 is suspended and supported by the beam member 2 via the suspension member 4.
The beam member 2 is a member having a predetermined length having a strength capable of supporting the weight of the rack 3 such as a steel pipe bar or a rope.
The rack 3 is formed of, for example, a steel member, and a device (not shown) is disposed inside. The wiring 7 of the device is a double floor 13 disposed on the floor slab 12 of the structure 10. It is connected to the inside.
The suspension member 4 includes a suspension fulcrum 5 having a pin structure fixed to the beam member 2, and a connecting member 6 that connects the suspension fulcrum 5 and four points on the upper surface of the rack 3. Is in a state where pendulum movement is possible with the suspension fulcrum 5 as a fulcrum. At this time, the rack 3 floats from the double floor 13 when stationary and vibrates, and there is always a space between the rack 3 and the double floor 13. This space is defined as a wiring installation space 8 in which the wirings 7 of the devices arranged in the rack 3 are installed.
The suspension fulcrum 5 employs, for example, a pin-structured ball joint, hook, ratchet, or the like, and the connecting member 6 employs a member having high strength and rigidity, such as a wire, rope, chain, or rod.

The connecting member 6 is a member that connects the suspension fulcrum 5 and the rack 3, and the length thereof is adjusted according to the required length L from the suspension fulcrum 5 to the center of gravity G of the rack 3. The length L is a factor that determines the natural period of the suspended rack 3, and the length L is set so that the natural period of the rack 3 is a natural period that is out of the dominant period band of earthquake motion.
The natural period of the rack 3 is set to, for example, 2.5 seconds or more, and the natural frequency of the rack 3 is set to 0.4 hertz or less. Further, the connecting position of the connecting member 6 and the rack 3 is adjusted according to the position of the center of gravity G so as to keep the level of the rack 3 in the horizontal direction.
The length of the connecting member 6 may be adjusted, for example, by hooking the connecting member 6 having a predetermined length on a hook provided on the ball joint of the suspension fulcrum 5 or a hook directly fixed to the beam member 2. Further, the connecting member 6 may be used as a chain, and the length of the connecting member 6 may be adjusted at a position where it is hooked to the chain hook without changing the entire length of the chain. The length may be adjusted. Moreover, you may use the pulley which makes the length of the connection member 6 variable.

Next, the effect of the hanging seismic isolation structure for furniture or equipment according to the first embodiment will be described with reference to the drawings.
According to the hanging seismic isolation structure 1a of the fixture or equipment according to the first embodiment, the rack 3 supported by being suspended by the beam member 2 has its natural period set to a natural period that is out of the dominant period band of the earthquake motion. Since it is possible, the effect which reduces the vibration which acts on the rack 3 at the time of an earthquake is produced.
Further, since the natural period of the rack 3 can be adjusted by the length L between the suspension fulcrum 5 and the center of gravity G of the rack 3, it can be easily set regardless of the weight and shape of the rack 3.

Further, since the rack 3 is in a state of floating from the double floor 13, a space is created between the rack 3 and the double floor 13, and this space can be used as the wiring installation space 8 of the equipment installed in the rack 3. Thus, as shown in FIG. 6, wiring is easier to perform than conventional seismic isolation structures for fixtures or equipment in which a seismic isolation device 33 is disposed between the fixture 31 and the floor 32.
Usually, a compressive force acts on the vertical member of the rack in the rack disposed on the floor, but a tensile force acts on the vertical member of the rack 3 in the suspended rack 3 according to the first embodiment. Acts, there is no fear of buckling of the vertical member.

  In the suspension or seismic isolation structure 1a for a fixture or equipment according to the first embodiment described above, vibration acting on the rack 3 due to an earthquake or the like can be efficiently reduced, and the rack 3 and the double floor 13 can be reduced. The wiring installation space 8 can be secured between them, and the usability of the fixtures or equipment can be improved.

  Next, the second embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from that of the embodiment will be described.

  As shown in FIG. 2, in the hanging seismic isolation structure 1b for fixtures or equipment according to the second embodiment, the beam member 2 provided in the hanging seismic isolation structure 1a for fixtures or equipment according to the first embodiment, This is a structure that is erected and fixed to a pillar member 21 erected on the floor slab 12. The beam member 2 is disposed at a position lower than the ceiling surface 14 of the structure 10.

Next, the function and effect of the fixture or equipment suspension seismic isolation structure 1b according to the second embodiment described above will be described with reference to the drawings.
Since the suspension or seismic isolation structure 1b for fixtures or equipment according to the second embodiment is a structure that is suspended and supported by the beam member 2, it is the same as the suspension or seismic isolation structure 1a for fixtures or equipment according to the first embodiment. Has an effect. In addition, for example, when a duct or an electrical wiring of an air conditioner is installed under the ceiling slab 11 and the beam member 2 cannot be fixed to the ceiling slab, the suspension of furniture or equipment according to the second embodiment is not allowed. Seismic structure 1b can be employed.

  Next, the third embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from the form will be described.

  As shown in FIG. 3, the hanging seismic isolation structure 1 c for furniture or equipment according to the third embodiment has a configuration in which two differently shaped racks 3 a and 3 b are suspended from the beam member 2 side by side. At this time, the length La from the suspension fulcrum 5 to the center of gravity Ga of the rack 3a and the length Lb from the suspension fulcrum 5 to the center of gravity Gb of the rack 3b are the same distance, and the natural period of the rack 3a and the rack 3b is Set to the same period.

Next, the function and effect of the hanging seismic isolation structure for furniture or equipment according to the third embodiment described above will be described with reference to the drawings.
In the hanging seismic isolation structure 1c for furniture or equipment according to the third embodiment, the plurality of racks 3a and 3b having different shapes have the same period with respect to vibration caused by an earthquake or the like. The rack 3a and the rack 3b are not buffered and can be installed side by side.

  Next, a modification of the first embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from each embodiment will be described.

The hanging seismic isolation structure 1d for fixtures or equipment shown in FIG. 4 has a configuration in which the rack 3 is suspended and supported from the suspension fulcrums 5 provided on the beam member 2 at four locations. 5 is a structure in which the rack 3 is suspended and supported from the suspension fulcrums 5 provided at eight places on the beam member 2.
In the hanging seismic isolation structures 1d and 1e for furniture or equipment, the rack 3 is supported by being suspended from the beam member 2 at a plurality of locations, so that the load applied to the beam member 2 can be dispersed and the rack 3 is stable. It is supported in a suspended state.
Moreover, the number of the suspension fulcrum 5 provided in the beam member 2 may be set as appropriate, and the position and number of the rack 3 may be set as appropriate.

As mentioned above, although the embodiment of the hanging seismic isolation structure for the furniture and equipment according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention. is there.
For example, in the above-described embodiment, the beam member 2 is installed on the structure 10 and the suspension fulcrum 5 is installed. However, the suspension fulcrum 5 is directly attached to a ceiling slab 11 of the structure 10 or a frame such as a beam. May be installed. In addition to the structural body 10, the suspension fulcrum 5 may be installed if the ceiling base material has a strength capable of being suspended.
In the above-described embodiment, the equipment is arranged inside the rack 3 supported by the suspension member 4 so that the wiring 7 of the equipment is installed in the space between the rack 3 and the double floor 13. However, instead of the rack 3, the devices may be directly supported by hanging from the suspension member 4, and the devices including the wiring 7 may not be provided in the rack 3. Further, the space between the rack 3 and the double floor 13 does not have to be the wiring space 8 when wiring is not necessary.
In addition, for example, in the above-described suspension or seismic isolation structure 1c for fixtures or equipment according to the third embodiment, or the suspension or seismic isolation structure 1d or 1e for a modification of the first embodiment, a beam member 2 is fixed to the ceiling slab 11, but may be fixed to a column member 21 erected on the floor slab 12.
Further, in the third embodiment described above, the two racks 3a and 3b are installed side by side, but a larger number may be installed side by side.
In short, it is only necessary to obtain the desired function in the present invention.

1a, 1b, 1c, 1d, 1e Hanging or seismic isolation structure for fixtures or equipment 2 Beam member 3, 3a, 3b Rack 4 Hanging member 5 Hanging fulcrum 7 Wiring 8 Wiring space 10 Structure 21 Pillar member G, Ga, Gb Center of gravity L, La, Lb Length

Claims (5)

It is a seismic isolation structure for reducing vibrations such as earthquakes that occur in fixtures or equipment arranged in the structure,
The fixture or equipment is supported by hanging from the structure or a member fixed to the structure by a suspension member, the length of the suspension member is adjusted, and the natural period of the fixture or equipment is excellent in seismic motion. A hanging seismic isolation structure for furniture or equipment, wherein the length between the center of gravity of the equipment or equipment from the suspension fulcrum is set so as to be out of the periodic band.   2. The hanging seismic isolation structure for a fixture or equipment according to claim 1, wherein the fixture or the equipment is suspended and supported from a beam member fixed to a ceiling slab of the structure.   2. The suspension / exemption of the fixture / equipment according to claim 1, wherein the fixture / equipment is suspended and supported from a beam member installed on a column member erected on a floor slab of the structure. Seismic structure.   The suspension or seismic isolation of a fixture or equipment according to any one of claims 1 to 3, wherein a plurality of said fixtures or appliances having different shapes or weights are adjusted to have the same length between the center of gravity from the suspension fulcrum. Construction.   The said fixture or equipment has wiring, such as an electric cable, and a wiring installation space can be ensured between the said fixture or equipment suspended and supported, and the floor of the said structure. A seismic isolation structure for fixtures or equipment described in 1.

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