JP7438864B2 - Damper device and seismic isolation structure equipped with the same - Google Patents

Description

The present invention relates to a damper device and a seismic isolation structure.

Conventionally, seismic isolation buildings are known as structures that aim to reduce earthquake input by extending the natural period of the building using seismic isolation devices such as laminated rubber. It can greatly reduce response acceleration and is effective in preventing furniture from falling during an earthquake.

However, in recent years, large seismic waveforms have been frequently observed, and concerns have been raised that the displacement of seismically isolated buildings could become larger than the design assumption and cause them to collide with retaining walls. Furthermore, there has recently been a need for countermeasures against long-period, long-duration earthquake motions, and it has become important not only to lengthen the period, but also to further suppress displacement.

If we focus on displacement suppression, it is effective to improve damping performance. Efforts to improve the damping performance of the seismic isolation device itself include, for example, arranging energy absorbing members such as lead-filled laminated rubber inside the device. However, the heat generated by energy absorption can be a problem. To further improve damping performance, it is possible to install a damping device separately from the seismic isolation device.

As a conventional device for solving such problems, a cylindrical damper as shown in FIG. 4 is known, for example (see, for example, Patent Document 1). As shown in this figure, the damper includes a cylindrical container 2 in which a viscous substance 1 such as oil is sealed, a piston 3 movably disposed inside the container 2, and a flow path 4 inside the piston 3. The piston rod 6 includes a damping valve 5 and a piston rod 6 that actuates the piston 3. When the piston rod 6 moves in the axial direction, the viscous body 1 passes through the narrow flow path 4, thereby exerting a damping force due to the resistance force generated.

Japanese Patent Application Publication No. 2016-053404

However, in the case of the conventional cylindrical damper mentioned above, since it exerts a damping force against the displacement of the piston rod in the axial direction, deformation of several tens of centimeters can occur in any horizontal direction, such as in seismically isolated buildings. When installing in a location, it is necessary to take measures against horizontal displacement in the direction orthogonal to the axis. Therefore, there has been a need for a damper that can accommodate displacement in any horizontal direction without taking such measures.

The present invention has been made in view of the above, and an object of the present invention is to provide a damper device that can effectively cope with displacement in any horizontal direction, and a seismic isolation structure equipped with the damper device.

In order to solve the above-mentioned problems and achieve the objects, a damper device according to the present invention is provided with a plurality of flexible damper devices arranged at intervals in the circumferential direction on the outer periphery of a shaft body, and with a working fluid sealed inside. a fluid passage communicating between the bags and providing passage resistance to the working fluid; and a regulating body disposed outside the bag to restrict outward movement of the bag. It is characterized by comprising:

Further, in another damper device according to the present invention, in the above-described invention, the bag body is installed between an inner jig fixed to the shaft body and an outer jig fixed to the regulating body, The inner jig and the outer jig are characterized in that they regulate the shape of the bag.

Further, in another damper device according to the present invention, in the above-described invention, the shaft body is a shear key that protrudes downward from the upper body and slidably abuts against the upper surface of the lower body. Features.

Furthermore, a seismic isolation structure according to the present invention is characterized by including the above-mentioned damper device.

According to the damper device according to the present invention, a plurality of flexible bags are arranged at intervals in the circumferential direction on the outer periphery of the shaft body, and the flexible bags each having a working fluid sealed therein communicate with each other. and a fluid passage that provides passage resistance to the working fluid, and a regulating body disposed outside the bag body to restrict outward movement of the bag body, so that the shaft body is displaced in the horizontal direction. Then, pressure is applied to the surrounding bag body, causing the internal working fluid to pass through the fluid passage. Since a damping force acts on the shaft due to the passage resistance at that time, it is possible to effectively cope with any horizontal displacement.

Further, according to another damper device according to the present invention, the bag body is installed between an inner jig fixed to the shaft body and an outer jig fixed to the regulating body, and the bag body is installed between an inner jig fixed to the shaft body and an outer jig fixed to the regulating body. Since the tool and the outer jig are for regulating the shape of the bag, the shape of the bag can be restricted.

Further, according to another damper device according to the present invention, the shaft body is a shear key that projects downward from the upper body and slidably abuts against the upper surface of the lower body, so that This has the effect of being able to effectively respond to displacement in any horizontal direction while transmitting axial force to the lower frame.

Moreover, according to the seismic isolation structure according to the present invention, since the above-described damper device is provided, it is possible to effectively cope with displacement in any horizontal direction.

FIG. 1 is a diagram showing an embodiment of a damper device according to the present invention, in which (1) is a plan sectional view and (2) is a side sectional view. FIG. 2 is an explanatory diagram showing an embodiment of the damper device according to the present invention. FIG. 3 is a diagram showing an embodiment of a seismic isolation structure according to the present invention, in which (1) is a plan sectional view and (2) is a side sectional view. FIG. 4 is a diagram showing an example of a conventional cylindrical damper, in which (1) is a sectional view and (2) is an external perspective view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a damper device and a seismic isolation structure including the same according to the present invention will be described in detail below based on the drawings. Note that the present invention is not limited to this embodiment.

As shown in FIG. 1, a damper device 10 according to an embodiment of the present invention includes a shear key 14 (shaft) fixed to an upper pillar 12 (upper frame), and a tube 16 disposed around the outer periphery of the shear key 14. (bag body), a conduit 18 that connects the tubes 16, and a regulating body 22 fixed to a lower beam 20 (lower frame).

The shear key 14 is a cylindrical member that protrudes vertically downward from the lower surface of the upper column 12. The lower surface of the sear key 14 is in contact with a sliding plate 24 fixed to the upper surface of the lower frame 20A. Therefore, the shear key 14 can slide horizontally along the sliding plate 24 while transmitting the axial force from the upper column 12 to the lower frame 20A. In this way, the shear key 14 constitutes a sliding support that supports the axial force of the upper part. Note that the lower surface of the sear key 14 is not limited to such an arrangement, and may be placed so as to be lifted from the lower frame 20A with a gap so that the shear key is not burdened with axial force.

The tubes 16 are rubber bags, and four tubes 16 are provided at equal intervals in the circumferential direction of the shear key 14. A viscous body F (working fluid) is sealed inside the tube 16 . Each tube 16 is installed between an inner jig 26 and an outer jig 28, and the shape before and after deformation is regulated by these. The inner jig 26 and the outer jig 28 are annular jigs in plan view. The outer jig 28 is fixed to the inner circumferential side of the regulating body 22, has a U-shape in a side cross-sectional view, and has a concave portion on the inner circumferential side for holding the tube 16. The inner jig 26 is fixed to the outer peripheral surface of the shear key 14, and has the same shape as the outer jig 28 so that when the tube 16 is pushed in the direction of the outer jig 28, the viscous body F inside the tube 16 can be efficiently suppressed. It has a U-shaped convex portion on the outer peripheral side. In the illustrated example, four tubes 16 are arranged at equal intervals in the circumferential direction, but the present invention is not limited to this, and any number of tubes 16 may be arranged on the outer circumferential side of the sear key 14. good.

The conduit 18 is a narrow fluid passage provided between circumferentially adjacent tubes 16. The interiors of each tube 16 communicate with each other via this conduit 18. A valve 30 is provided inside each conduit 18 to provide passage resistance to the viscous body F. The opening degree of the valve 30 can be set as appropriate.

The regulating body 22 is for regulating the outward movement of the tube 16, and is arranged on the lower beam 20 outside the outer jig 28. The regulating body 22 consists of a horizontal plate 34 fixed onto the beam 20 with bolts 32, and a right triangular vertical plate 36 protruding from the upper surface of the horizontal plate 34. The vertical plate 36 extends in the direction in which the beam 20 extends, and the outer jig 28 is fixed to the vertical side located on the side closer to the tube 16. Since the regulating body 22 is fixed to the lower beam 20, the regulating body 22 and the shear key 14 are movable relative to each other in the horizontal direction (the direction perpendicular to the direction of the axis Z).

The operation and effect of the above configuration will be explained.
FIG. 2 shows an example where the upper column 12 is displaced in the horizontal direction during an earthquake. As shown in this figure, when the shear key 14 moves horizontally together with the column 12 during an earthquake, each tube 16 deforms into a shape constrained by the shapes of the inner jig 26 and the outer jig 28. This deformation applies pressure to the tube 16, and the compressed viscous material F inside the tube 16 moves into the adjacent tube 16 through the valve 30 of the conduit 18. On the other hand, since the pressure also increases in the adjacent tube 16, the viscous body F further moves inside the adjacent tube 16, causing the tube 16 on the opposite side to the compression side to expand. Since a damping force is generated when the viscous body F passes through the valve 30 of the conduit 18, horizontal displacement of the shear key 14 in any direction can be effectively coped with. Therefore, damping performance against earthquakes in any direction is improved, and response acceleration and response displacement can be reduced.

FIG. 3 is an example of the base isolation structure of this embodiment. As shown in this figure, the seismic isolation structure 100 of this embodiment is a seismic isolation building that includes the above-mentioned damper device 10 and a seismic isolation device 40 made of laminated rubber in the seismic isolation layer 38. The damper device 10 is arranged symmetrically on the left and right sides of the seismic isolation layer 38 so as not to cause twisting in the building during operation. This seismic isolation structure 100 can be constructed by replacing a part of the seismic isolation device 40 arranged in the seismic isolation layer 38 with the damper device 10. Since this seismic isolation structure 100 includes the damper device 10 described above, it can exhibit damping performance against earthquakes in any direction.

As explained above, according to the damper device according to the present invention, a plurality of flexible bags are arranged at intervals in the circumferential direction on the outer periphery of the shaft body, and a working fluid is sealed inside the flexible bags; The shaft is provided with a fluid passage that communicates between the bags and provides passage resistance to the working fluid, and a regulating body disposed outside the bag to restrict outward movement of the bag. When the body is displaced in the horizontal direction, pressure is applied to the surrounding bag body, causing the internal working fluid to pass through the fluid passage. Since a damping force acts on the shaft due to the passage resistance at that time, it is possible to effectively cope with any horizontal displacement.

Further, according to another damper device according to the present invention, the bag body is installed between an inner jig fixed to the shaft body and an outer jig fixed to the regulating body, and the bag body is installed between an inner jig fixed to the shaft body and an outer jig fixed to the regulating body. Since the tool and the outer jig are for regulating the shape of the bag, the shape of the bag can be restricted.

Further, according to another damper device according to the present invention, the shaft body is a shear key that projects downward from the upper body and slidably abuts against the upper surface of the lower body, so that It is possible to effectively respond to displacement in any horizontal direction while transmitting axial force to the lower frame.

Moreover, according to the seismic isolation structure according to the present invention, since the above-described damper device is provided, it is possible to effectively cope with displacement in any horizontal direction.

As described above, the damper device according to the present invention and the seismic isolation structure equipped with the same are useful for seismic isolation structures that suppress response displacement without impairing the effect of reducing response acceleration to earthquakes, and are particularly useful for arbitrary Suitable for accommodating horizontal displacement.

10 Damper device 12 Column (upper frame)
14 Sea key (shaft body)
16 Tube (bag body)
18 Piping (fluid passage)
20 Beam (lower frame)
20A Frame 22 Regulator 24 Sliding plate 26 Inner jig 28 Outer jig 30 Valve 32 Bolt 34 Horizontal plate 36 Vertical plate 38 Seismic isolation layer 40 Seismic isolation device 100 Seismic isolation structure F Viscous body (working fluid)

Claims (3)

A plurality of flexible bags arranged at intervals in the circumferential direction on the outer periphery of the shaft body and in which a working fluid is sealed; and a fluid that communicates between the bags and provides passage resistance to the working fluid. comprising a passageway and a regulating body disposed outside the bag body for regulating outward movement of the bag body ,
The bag body is installed between an inner jig fixed to the outer peripheral surface of the shaft body and an outer jig fixed to the inner circumferential side of the regulating body,
The inner jig and the outer jig are for regulating the shape of the bag, and the outer jig has a U-shape in a side cross-sectional view, and is used to hold the bag. A damper device having a concave portion on the inner peripheral side, and the inner jig having a U-shaped convex portion on the outer peripheral side in a side cross-sectional view . 2. The damper device according to claim 1 , wherein the shaft protrudes downward from the upper body and slidably abuts against the upper surface of the lower body. A seismic isolation structure comprising the damper device according to claim 1 or 2 .

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