JP2011085250A - Vertical base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical base isolation device suppressing increase of an amplitude in the vertical direction. <P>SOLUTION: The vertical base isolation device isolates the vertical vibration transmitted from a lower structure to an upper structure. An elastic member for supporting the upper structure is interposed between the upper structure and the lower structure. The vertical base isolation device includes a vertical displacement regulating member for regulating a relative displacement in the vertical direction of the upper structure caused by the vibration to the lower structure. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vertical seismic isolation device that isolates vertical vibrations.

  A vertical seismic isolation device is known that lengthens the natural period of the seismic isolation target that is elastically supported by reducing the rigidity of the buffer spring of the vertical seismic isolation device (see, for example, Patent Document 1).

JP-A-11-101298

  When the above vertical seismic isolation device is used in, for example, a building, there is a risk that the amplitude of the floor at the time of the earthquake will increase due to the longer natural period. Vibration with a large amplitude causes discomfort and anxiety for people on the floor. Moreover, since only the vibration of the seismic isolation target is prolonged, there is a problem that a step is generated between the floor and the floor that is not the seismic isolation target, which may cause an obstacle in evacuation or the like.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vertical seismic isolation device capable of suppressing an increase in amplitude in the vertical direction.

In order to achieve such an object, the vertical seismic isolation device of the present invention is a vertical seismic isolation device for isolating vertical vibration transmitted from the lower structure to the upper structure, the upper structure and the lower An elastic member that supports the upper structure is interposed between the structure and a vertical displacement restricting member that restricts a relative displacement amount of the upper structure relative to the lower structure due to the vibration in the vertical direction. It is a vertical seismic isolation device characterized by having.
According to such a vertical seismic isolation device, the lower structure of the upper structure is supported by the elastic member even if the natural period in the vertical direction is lengthened and the vertical displacement of the upper structure increases. Since the relative displacement amount in the vertical direction relative to the vertical structure is regulated by the vertical displacement regulating member, the vertical displacement of the upper structure relative to the lower structure, that is, the increase in amplitude can be suppressed.

In such a vertical seismic isolation device, the elastic member is interposed between the lower structure and a floor steel beam provided in the upper structure, and the vertical displacement restricting member is attached to the lower structure. A lower stopper that comes into contact when the floor steel beam is displaced relative to the lower structure; and a lower stopper that is provided on the lower structure and is disposed above the floor steel beam. It is desirable to have an upper stopper that comes into contact with the lower structure when it is relatively displaced upward.
According to such a vertical seismic isolation device, the elastic member is interposed between the lower structure and the floor steel beam, and when the floor steel beam placed on the elastic member is relatively displaced downward, When it is displaced upward, it is restricted by contacting the upper stopper. For this reason, it is possible to suppress an increase in the relative displacement amount of the upper structure. Further, by appropriately setting the positions of the upper stopper and the lower stopper in the vertical direction, it is possible to set the relative displacement amount of the floor steel frame beam to a desired displacement amount.

The vertical seismic isolation device preferably includes a horizontal displacement regulating member that regulates a horizontal relative displacement amount of the upper structure with respect to the lower structure due to the vibration.
According to such a vertical seismic isolation device, since there is a horizontal displacement restricting member that restricts the relative displacement of the upper structure relative to the lower structure in the horizontal direction, It is possible to provide a vertical seismic isolation device capable of regulating the relative displacement amount.

In this vertical seismic isolation device, the horizontal displacement regulating member is provided in the lower structure along the vertical direction, and is provided in the upper structure, through which the column member passes, It is desirable to have the guide part provided with the through-hole which has a space | gap between the outer peripheral surfaces of a member.
According to such a vertical seismic isolation device, it is possible to regulate not only vertical isolation but also horizontal displacement. Moreover, it is possible to set the relative displacement amount in the horizontal direction of the upper structure to a desired displacement amount by appropriately setting the gap between the through hole and the outer peripheral portion of the column member.

  According to the present invention, it is possible to provide a vertical seismic isolation device that can suppress an increase in amplitude in the vertical direction.

It is a front view of the lower floor part of the building provided with the vertical seismic isolation apparatus concerning this embodiment. It is a top view of the vertical seismic isolation device of the present invention. It is a side view of the vertical seismic isolation device of the present invention. It is a figure for demonstrating the characteristic of a disc spring. It is a plane sectional view for explaining a guide mechanism.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a lower floor portion of a building provided with a vertical seismic isolation device according to the present embodiment. FIG. 2 is a plan view of the vertical seismic isolation device of the present invention. FIG. 3 is a side view of the vertical seismic isolation device of the present invention.

  The vertical seismic isolation device 10 of this embodiment is provided at a plurality of locations between a foundation 1 as a lower structure and a floor material 3 forming a part of a building 2 as an upper structure, and is a floor steel frame made of H-shaped steel. It is provided so that the parted part of the big beam 5 may be connected, and the flooring 3 is mounted. In the following description, one vertical seismic isolation device 10 will be described.

  The vertical seismic isolation device 10 includes a compression coil spring 12 as an elastic member that supports the building 2 as an upper structure, and a connecting member 14 that is placed on the compression coil spring 12 and connects the divided floor steel beam 5. A gate-type frame 20 that is erected from the foundation 1 and is disposed so as to straddle the floor-steel girder 5, a friction damper 30 that is interposed between the connecting member 14 and the gate-type frame 20, and the floor-steel girder 5 And a guide mechanism 40 for restricting movement.

  The compression coil spring 12 has an elastic force capable of dispersing and supporting the load of the building 2 in use by the plurality of vertical seismic isolation devices 10, and the compression coil spring 12 is connected to the connecting member 14 and the foundation 1. Are formed between the connecting member 14 and the floor steel beam 5 and the foundation 1. That is, the portion above the connecting member 14 and the floor steel beam 5 of the building 2 is supported by the compression coil spring 12.

  The connecting member 14 has a substantially rectangular shape in plan view and is a box-like member having an open lower side, and the flooring 3 is placed on the upper part. A compression coil spring 12 is provided inside the box-shaped connection member 14, and an inner upper surface of the connection member 14 is supported by the compression coil spring 12 disposed on the foundation 1. Further, two facing side wall portions 15, 16 provided at positions corresponding to four sides of the rectangular shape are provided so as to surround the compression coil spring 12 provided on the inner side, and the pair of side wall portions 15. The ends of the divided floor steel beam 5 are joined to each other, and the floor steel beam 6 is joined to the other pair of side wall portions 16. That is, the floor steel large beam 5 and the floor steel small beam 6 are joined through the connecting member 14 so as to be orthogonal to each other.

  The portal frame 20 includes a column member 21 made of two cylindrical steel pipes provided at an interval, and a frame structure 22 made of H-type steel spanned on the two column members 21. .

  The column member 21 is provided with steel plates 21a at upper and lower ends, and is reinforced by ribs 21c that connect the steel plate 21a and the cylindrical steel pipe 21b. The portal frame 20 is provided so that each of the two column members 21 is positioned on both sides of the floor steel beam 5, and the connecting member 14 and the frame body 22 are arranged on the connecting member 14 so as to be substantially parallel to each other. They are placed close together. The column member 21 is configured such that the upper end portion is positioned higher than the upper surface of the floor steel beam 5, and the lower surface 22 a of the frame 22 spanned on the column member 21 and the upper surface 5 a of the floor steel beam 5 are defined. A space is provided in the vertical direction.

  The friction damper 30 includes a sliding member 31 fixed via a plate 17 provided on the connecting member 14, and two pressing members 32 fixed to the upper portion of the frame body 22 and disposed on both sides of the sliding member 31. The bar screw 35 penetrating the sliding member 31 and the two pressing members 32, two nuts 36 screwed one by one from both ends of the bar screw 35, and two screws screwed to the bar screw 35 And a disc spring 33 as an urging member compressed between the nuts 36.

  The sliding member 31 is a metal member in which two plate portions arranged substantially at right angles are L-shaped, and one of the two plate portions is a seat plate portion 31a fixed to the connecting member 14 side. The other plate portion is a sliding plate portion 31b as a first plate member. The sliding plate portion 31 b protrudes in the direction along the floor steel beam 5 in a state where the sliding member 31 is fixed to the connecting member 14. That is, the sliding plate portion 31b is substantially perpendicular to the surface of the connecting member 14 facing the floor steel beam 5 side. The sliding plate portion 31b is long in the vertical direction, and has a long hole 31c that extends through the sliding plate portion 31b in the vertical direction.

  The pressing member 32 is also a metal member in which two plate portions arranged substantially at right angles are L-shaped, one of the two plate portions is a seat plate portion 32a fixed to the frame body 22, and the other The plate portion is a pressing plate portion 32b as a second plate member. The pressing plate portion 32 b protrudes upward in the vertical direction in a state where the pressing member 32 is fixed to the frame body 22. The two pressing members 32 face each other with the pressing plate portions 32b spaced apart from each other, and the respective seat plate portions 32a are arranged on the side opposite to the side facing the pressing plate portions 32b and fixed to the frame body 22. Has been. Further, the pressing plate portion 32b protrudes from the frame body 22 toward the connecting member 14, and the sliding plate portion 31b of the sliding member 31 is disposed while the two pressing plate portions 32b face each other. ing. Each of the two pressing plate portions 32b is provided with a through hole 32c through which the bar screw 35 passes.

  In the friction damper 30, the rod screw 35 penetrating through a through hole (not shown) of one pressing plate portion 32 b in a state where the sliding plate portion 31 b is inserted between the two pressing plate portions 32 b. It passes through a long hole 31c of 31b and a through hole (not shown) of the other pressing plate portion 32b, and further a disc spring 33 is inserted, and two nuts 36 are screwed from both ends of the bar screw 35. ing.

  In the friction damper 30, the disc spring 33 is compressed by tightening the nut 36, and the pressing plate portion 32b presses the sliding plate portion 31b from both sides by the elastic force of the disc spring 33. The elastic force of the disc spring 33 is, for example, a static frictional force that does not cause slippage between the sliding plate portion 31b and the pressing plate portion 32b of the friction damper 30 when the building user or the like walks on the floor. The disc spring 33 is compressed.

  FIG. 4 is a diagram showing the spring characteristics of the disc spring. As shown in the figure, the disc spring 33 has a characteristic that the biasing force with respect to the displacement amount of the spring height changes greatly in the region where the compression amount is small, and the change of the biasing force with respect to the displacement amount of the spring height is small in the region where the compression amount is large. have. For this reason, in order to stabilize the timing at which the friction damper 30 starts to slide, the disc spring 33 of this embodiment is biased in a region where the change in biasing force is small (in FIG. 4, the region where the spring height is a1 to a2). So that it is compressed.

  When the foundation 1 as the lower structure vibrates due to an earthquake or the like, vibration is transmitted to the building 2 as the upper structure from the friction damper 30 side and the supported compression coil spring 12 side. At this time, when the force acting in the vertical direction due to the earthquake is equal to or less than the static friction force acting on the disc plate 33 and acting between the pressing plate portion 32b and the sliding plate portion 31b, the friction damper 30 is The portal frame 20, the connecting member 14, and the floor steel beam 5 do not function as a damper and vibrate together. In this case, the vertical seismic isolation function by the compression coil spring 12 does not act.

  In addition, when the force acting in the vertical direction due to the earthquake is greater than the static friction force acting between the pressing plate portion 32b and the sliding plate portion 31b urged by the disc spring 33, the pressing plate portion 32b The sliding plate portion 31b relatively moves in the vertical direction while sliding on each other. At this time, the vibration cycle of the vibration transmitted from the foundation 1 is lengthened by the compression coil spring 12, and the vibration energy is consumed by the friction damper 30 to suppress the vibration.

  That is, in the vertical seismic isolation device 10, the friction damper 30 operates not only in the function as a damper, but also in the vertical seismic isolation mechanism when a vertical force larger than the set static friction force is applied. It also has a function as a trigger.

  The guide mechanism 40 protrudes from the floor steel frame beam 5 in the horizontal direction, the guide plate 41 through which the column member 21 of the portal frame 20 passes, and the frame structure of the portal frame 20 positioned above the floor steel frame beam 5. 22, and an upper stopper 42 provided on the lower surface of the floor steel frame beam 5 and a lower stopper 43 provided on the foundation 1.

  FIG. 5 is a plan sectional view for explaining the guide mechanism. As shown in the drawing, the guide plate 41 is fixed to an intermediate plate 5d provided at the center between the upper and lower flanges 5b of the floor steel beam 5 and protrudes from the web 5c on both sides intersecting the longitudinal direction of the floor steel beam 5. A hole 41a through which the column member 21 passes is provided. A bush 44 for smoothly moving the column member 21 and the guide plate 41 relative to each other is provided at the inner peripheral edge of the hole 41a, and between the through hole 44a forming the inner peripheral surface of the bush 44 and the column member 21. Is provided with a slight gap. For this reason, when the floor steel girder 5 moves in the horizontal direction, the bush 44 provided in the hole 41 a comes into contact with the column member 21, thereby restricting the horizontal movement of the floor steel girder 5. Even if the floor steel girder 5 moves in the horizontal direction, it is the bush 44 that contacts the column member 21, so that the vertical vibration of the floor steel girder 5 is not restricted by the guide plate 41. For this reason, even when the gate frame 20 and the connecting member 14 and the floor steel beam 5 are relatively moved in the vertical direction using the friction damper 30 as a trigger, the gate frame 20 and the connecting member 14 and the floor steel beam 5 and The relative movement is not hindered.

  Further, the vertical movement of the floor steel beam 5 is configured to be regulated by an upper stopper 42 provided on the lower surface 22a of the frame body 22 of the portal frame 20 and a lower stopper 43 provided on the foundation 1. Has been. That is, when the floor steel girder 5 moves relatively upward due to an earthquake or the like, the upper steel 42 contacts the upper stopper 42 and the upward movement is restricted. When the floor steel girder 5 moves relatively downward, It is configured to be in contact with the lower stopper 43 and restricted from moving downward.

  In the building 2 equipped with the vertical seismic isolation device of this embodiment, the vertical seismic isolation device 10 does not function between the foundation 1 and the building 2 for small vibrations such as a person walking in the building. The displacement of the building 2 is changed by the guide mechanism 40 when a vertical force larger than the static frictional force that does not cause slippage between the sliding plate portion 31b and the pressing plate portion 32b of the friction damper 30 acts. The vertical seismic isolation device 10 functions while being regulated. When the vibration is reduced and the acting vertical force is equal to or less than the static frictional force that does not cause a slip between the sliding plate portion 31b and the pressing plate portion 32b of the friction damper 30, the building 2 and the foundation The relative movement with respect to 1 stops, and the building 2 is held on the foundation 1 side via the friction damper 30. For this reason, even after the vertical seismic isolation device 10 is activated due to an earthquake or the like, the friction damper 30 is restored to the state before the operation in a state where the vibration has subsided. Therefore, it is possible to prepare for the next earthquake.

  According to the vertical seismic isolation device 10 of the present embodiment, even if the vertical displacement of the building 2 is increased by being supported by the compression coil spring 12 and the natural period in the vertical direction is lengthened, it is provided on the building side. Since the amount of relative displacement in the vertical direction with respect to the foundation 1 of the floor steel beam 5 is restricted by the upper stopper 42 and the lower stopper 43, the relative displacement in the vertical direction with respect to the foundation 1 on the building side, that is, the increase in amplitude is suppressed. Is possible.

  Further, the compression coil spring 12 is interposed between the foundation 1 and the floor steel beam 5 and when the floor steel beam 5 arranged on the compression coil spring 12 is relatively displaced downward, the lower stopper 43 Further, when it is displaced upward, the upper stopper 43 contacts and is regulated. For this reason, it is possible to reliably suppress an increase in the relative displacement amount of the building 2. In addition, by appropriately setting the vertical positions of the lower end of the upper stopper 42 and the upper end of the lower stopper 43, it is possible to set the relative displacement amount of the floor steel beam 5 to a desired displacement amount. That is, it is possible to suppress the vertical amplitude of the building due to an earthquake or the like to a desired amplitude while maintaining the desired seismic isolation performance.

  In addition, the guide mechanism 40 has a mechanism that regulates the amount of relative displacement in the horizontal direction with respect to the foundation 1 of the floor steel beam 5 by the through hole 44a of the bush 44 provided in the guide plate 41 and the column member 21. It is possible to provide the vertical seismic isolation device 10 that can also regulate the amount of horizontal relative displacement of the floor steel beam 5 with respect to the foundation 1.

  In addition, by appropriately setting the gap between the through hole 44a and the outer peripheral portion of the column member 21, it is possible to set the relative displacement amount in the horizontal direction of the floor steel beam 5 to a desired displacement amount.

  Moreover, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

1 foundation, 2 building, 3 flooring, 5 floor steel beam, 5a top surface,
5b flange, 5c web, 5d intermediate plate,
6 floor steel beam, 10 vertical seismic isolation device, 12 compression coil spring,
14 connecting members, 15 side walls, 16 side walls, 17 plates,
20 portal frame, 21 pillar member, 21a steel plate, 21b cylindrical steel pipe,
21c rib, 22 frame, 22a bottom surface, 30 friction damper,
31 sliding member, 31a seat plate portion, 31b sliding plate portion, 31c long hole,
32 pressing member, 32a seat plate part, 32b pressing plate part, 32c through-hole,
33 disc spring, 35 bar screw, 36 nut, 40 guide mechanism,
41 guide plate, 41a hole, 42 upper stopper, 43 lower stopper,
44 Bushing, 44a Through hole

Claims (4)

A vertical seismic isolation device for isolating vertical vibration transmitted from the lower structure to the upper structure,
Between the upper structure and the lower structure,
An elastic member that supports the upper structure is interposed,
A vertical seismic isolation device comprising a vertical displacement restricting member for restricting a relative displacement amount in the vertical direction of the upper structure with respect to the lower structure due to the vibration. The vertical seismic isolation device according to claim 1,
The elastic member is interposed between the lower structure and a floor steel beam provided in the upper structure,
The vertical displacement regulating member is provided in the lower structure, and a lower stopper that comes into contact when the floor steel beam is relatively displaced downward with respect to the lower structure,
An upper stopper provided in the lower structure and disposed above the floor steel girder, and contacting the floor steel girder when the floor steel girder is relatively displaced upward with respect to the lower structure;
A vertical seismic isolation device characterized by comprising: The vertical seismic isolation device according to claim 1 or 2,
A vertical seismic isolation device comprising a horizontal displacement restricting member that restricts a relative displacement amount of the upper structure relative to the lower structure due to the vibration. The vertical seismic isolation device according to claim 3,
The horizontal displacement regulating member is provided between the column member provided in the vertical direction in the lower structure and the upper structure, the column member is penetrated, and a gap is formed between the column member and the outer peripheral surface of the column member. And a guide portion having a through hole having a vertical seismic isolation device.

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