JP2003042222A - Damper of base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper of a base isolation device securing stable performance and being easily inserted between a base isolation object and a support structure. SOLUTION: Multiple plates 34 and 40 are stacked and movably joined by bolts 46 while mutually sliding and the friction damper 30 having disk springs 50a for energizing a pressure-contact force to their stacked parts is interposed between a base isolated structure 12 and the support structure 16. The mutual pressure-contact plates 34 and 40 are so formed that connecting parts 36 provided in the end parts in mutually opposed sides in the loading direction are rotationally attached between the base isolated structure 12 and the support structure 16. Multiple bolts 46 and the disk springs 50a are provided on the whole range between the both connecting parts 36. The outer circumference of the friction damper 30 is covered with a steel pipe 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper of a vibration isolation device interposed between a seismic isolation target and its supporting structure.

[0002]

2. Description of the Related Art Generally, a seismic isolation device is used to block or reduce the input of earthquakes and daily vibrations. This seismic isolation device supports a seismic isolation target with a long periodicity. It is configured to include an element, a spring element that suppresses an amplitude (displacement amount), and a damper element that damps vibration. The bearing elements include sliding bearings and rolling bearings, the spring elements include coil springs, and the damper elements include oil dampers and friction dampers.

For example, there is a seismic isolation device in which a laminated rubber and a friction damper which also serve as the supporting element and the spring element are interposed between an upper structure and a lower structure which are objects to be isolated. This friction damper is composed of a support body projecting downward from the upper structure and a friction material provided on the upper surface of the lower structure facing the lower end of the support. That is, the upper structure is supported by the laminated rubber and the supporting body, and when the laminated rubber is deformed in the horizontal direction while being deformed by an earthquake or the like, the supporting body slides on the friction material and its displacement energy is generated by friction. It constitutes a friction damper that converts energy into energy and absorbs vibration.

[0004]

However, in the above-mentioned seismic isolation device, since the support body constituting this friction damper also supports the upper structure, the device itself becomes large, and a large amount of work is required for its installation. Is required. Further, since the upper structure and the lower structure themselves form the friction damper, the friction damper has to be installed on site as a part of the upper structure and the lower structure. Therefore, there is a problem that the workability is poor and it takes a lot of time and labor.

Further, the frictional force of the friction damper is caused by the weight of the upper structure, and this weight acts on the laminated rubber and the bearing in a dispersed manner, so that the weight applied to the bearing side is set to a predetermined load. There is a problem that it is difficult to set it stably and the desired seismic isolation effect cannot be obtained.

Although some oil dampers can be mounted relatively easily by using an oil damper instead of the friction damper, if the enclosed oil leaks, it must be refilled, and the loading method during transportation and There is a problem that the original performance may not be exhibited due to a fall or the like.

Therefore, the present invention has been made in view of such conventional problems, and it is possible to secure stable performance and to easily install the seismic isolation device between the seismic isolation target and its supporting structure. The purpose is to provide a damper.

[0008]

In order to achieve such an object, the invention as set forth in claim 1 provides a plurality of dampers for a vibration isolation device interposed between an object to be isolated and a supporting structure thereof. The plate members are overlapped with each other and are bolt-nut joined so as to be movable while sliding relative to each other in a predetermined direction. The plate members that are in pressure contact with each other are each provided with a connecting portion at opposite ends in the moving direction, and the connecting portion is rotatably attached to the seismic isolation target and the support structure, respectively. It is characterized by

According to this structure, since the damper constituting the seismic isolation device can be a friction damper that functions alone, it is not necessary to assemble it on site, and the friction damper is assembled at a well-equipped place such as a factory. be able to. Therefore, the friction damper can be easily assembled in a short time, and the friction damper in which a desired friction force acts can be configured by adjusting the biasing force of the disc spring by mechanical work. Further, since the friction damper is provided with the connecting portions at both ends, it can be easily attached between the seismic isolation target and its supporting structure like an oil damper although it is a friction damper.

According to a second aspect of the present invention, the plate material is superposed over the entire area between the both coupling parts, and the bolt / nut and the disc spring are provided in the superposed part, and the friction damper is subjected to buckling deformation of the plate material. It is characterized in that its outer circumference is covered with a steel pipe that prevents

That is, since the bolts and disc springs are distributed and arranged in the whole area of the plate material, the friction damper does not locally increase in size and can be installed in any installation location even in a narrow installation space. it can.

Further, since the plate material which is relatively displaced is prevented from buckling deformation by the steel pipe, stable damper performance can be ensured, and the plate spring and the bolt nut are covered by the steel pipe and are not exposed to the outside. It can be applied even to the exposed part.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a schematic view showing an embodiment of a seismic isolation structure suitable for a damper of a seismic isolation device of the present invention, FIG. 2 is a plan sectional view of the damper, FIG. 3 is a side sectional view of FIG. 2, and FIG. FIG.

The damper of the seismic isolation device of the present invention is, for example, a laminated rubber 14 between an upper foundation 12 and a lower foundation 16 of a building.
And the upper and lower foundations 12 and 16 are rotatably pin-coupled to the upper and lower fixing members 20 respectively projecting from the upper foundation 12 and the lower foundation 16 toward the opposite sides thereof. The friction damper 30 absorbs external force. Here, the laminated rubber 14 and the friction damper 3
It is desirable that a large number of 0s are provided between the upper base 12 and the lower base 16 and that the plurality of friction dampers 30 are installed in pairs so as to be oriented in directions orthogonal to each other.

The friction damper 30 is composed of a lower damper unit 32 attached to the lower fixing member 20a and an upper damper unit 38 attached to the upper fixing member 20b.

The lower damper unit 32 is composed of three pressure contact plates 34 made of strip-shaped plate members and a connecting member 36 for integrally connecting the pressure contact plates 34 to the fixing member 20.

The three press-contact plates 34 are welded at one end in the longitudinal direction thereof to the connecting member 36 with their plate surfaces facing each other and spaced apart at appropriate intervals.

The coupling member 36 is composed of two bearing plates 36a sandwiching the fixing member 20 and a joint portion 36b for joining one ends of the bearing plates 36a with a space therebetween, and the bearing plate 36a is joined to the joint portion 36b. The pressure contact plate 34 is welded from the opposite side. The bearing plate 36a is provided with a through hole 36c for pin-joining the lower damper unit 32 to the fixing member 20, and the rotary shaft 44 is inserted into the through hole 36c together with the opening 20c of the fixing member.

The upper damper unit 38 is made of the same plate material as that of the lower damper unit 32 and is spaced apart from each other.
It is composed of a single press-contact plate 40 and the connecting member 36 provided at one end thereof. Similar to the lower damper unit 32, the connecting member 36 is welded to the joint portion 36b thereof from the side opposite to the bearing plate 36a from the pressure contact plate 40.

Between the three pressure contact plates 34 of the lower damper unit 32, two of the upper damper units 38 are provided.
The five pressure contact plates 40 are inserted and the five pressure contact plates 34, 40 are superposed. Pressure contact plate 34 of the lower damper unit 32
A plurality of insertion holes 3 which are located at the center in the width direction and through which the bolts 46 penetrate at appropriate intervals in the longitudinal direction.
4a is provided, and the press contact plate 40 of the upper damper unit 38 is formed with an elongated hole 40a along the longitudinal direction thereof so as to correspond to the insertion hole 34a. The insertion holes 34a and the elongated holes 40a are formed in the superposed pressure contact plates 34, 40.
The friction plates 48 are fixed so as to avoid the above. Here, the friction plate 48 uses a thermosetting resin as a binding material, a fiber material such as aramid fiber, glass fiber, vinylon fiber, carbon fiber, and asbestos, a friction adjusting material such as cashew dust and lead, and a sulfuric acid valueme. It is formed of a composite friction material composed of a filler and has a significantly low wear characteristic having a constant friction coefficient.

A disc spring unit 50 is formed by inserting a bolt 46 into the insertion hole 34a of the overlapping portion of the five pressure contact plates 34 and 40 and the elongated hole 40a, and superposing seven disc springs 50a on the protruding portion. Is inserted and fastened with a nut 52 to compress the disc spring unit 50. This disc spring unit 5
The elastic force due to the compression of 0 urges the friction plate 48 between the pressure contact plates 34 and 40 to be pressed.

When the building is horizontally displaced between layers due to an earthquake or the like, in the friction damper 30, the upper damper unit 38 and the lower damper unit 32 are horizontally displaced relative to each other, and the displacement energy is consumed by friction to vibrate. To attenuate. At this time, if a large washer 54 is interposed between the bolt head portion 46a and the pressure contact plate 34, and between the disc spring unit 50, the pressure contact plate 34 and the nut 52, the bolt axial force is surely input to the disc spring unit 50 and a predetermined amount. It is easy to obtain frictional force.

Further, the lower damper unit 32 is provided with a rectangular steel pipe 56 for covering the pressure contact plates 34, 40 from the outside thereof, and the pressure contact plate 34b located in the middle of the three pressure contact plates 34 is the other pressure contact plate. It is formed to be slightly wider than 34c, and a square steel pipe 56 is welded to the side portion of this press contact plate 34b to be integrated. The rectangular steel pipe 56 has a function of acting as a guide when the lower damper unit 32 and the upper damper unit 38 are relatively displaced and preventing their buckling deformation. That is, the friction damper 30 has a form in which the connecting members 36 for the fixing member 20 are provided at both ends of the rectangular steel pipe 56 in appearance.

This friction damper 30 is assembled in a factory or the like and carried into the site, and the lower foundation 12 and the upper foundation 16 are assembled.
The upper and lower damper units 32, 3 so as to sandwich the fixing member 20 provided in and between the bearing plates 36a of the coupling member 36.
8 can be attached to the building by simply disposing the bearings 8 and fixing the bearing plates 36a and the rotating member 44 penetrating the fixing member 20. In the present embodiment, an example in which the friction damper 30 is installed so as to act on a horizontal load has been shown, but the present invention is not limited to this.

That is, the friction damper 30 of this embodiment.
The friction damper 30 does not need to be assembled in the field because it can be configured as a unit separate from the building. Therefore, the friction damper 30 can be assembled easily and in a short time using a substantial facility such as a factory, and the friction force exerted by a desired friction force by accurately adjusting the biasing force of the disc spring unit 50 by mechanical work. The damper 30 can be configured.

Further, the disc spring unit 50 for urging the friction damper 30 and the bolt 46 and the nut 52 are dispersed over the entire area of the pressure contact plates 34, 40, so that the friction damper 30 is locally enlarged. Even if it is between the narrow upper foundation 16 and the lower foundation 12, it can be easily attached regardless of the installation location.

Further, since the overlapping portion of the pressure contact plates 34 and 40 constituting the friction damper 30 is guided by the rectangular steel pipe 56 in its displacement direction and is not buckled and deformed, stable damper performance and high reliability can be secured. it can. Further, since the disc spring unit 50 and the bolts 46 and the nuts 52 are covered with the square steel pipe 56 and are not exposed to the outside, the appearance is good, and the friction damper 30 can be provided even at the exposed portion.

In this embodiment, the friction damper 3 is used.
Although 0 is applied to the seismic isolation device interposed between the upper foundation 12 and the lower foundation 16 of the building, the present invention is not limited to this.
Any seismic isolation device provided between two structures can be applied.

[0029]

As described above, since the damper of the seismic isolation device of the present invention is a friction damper which is not incorporated as a part of the structure but is formed as a single unit, it can be easily assembled in a factory in a short time. In addition, it is possible to set a desired frictional force by mechanical work, and it can be easily installed.

Further, since the plurality of bolts and disc springs are dispersed over the entire area of the plate member, the friction damper does not locally increase in size and can be freely incorporated even in a narrow installation space.

Further, since the outer periphery of the friction damper is covered with the steel pipe for preventing the buckling deformation of the plate material, stable damper performance can be ensured and the friction damper can be applied to the exposed portion without impairing the appearance. be able to.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a seismic isolation structure suitable for a damper of a seismic isolation device of the present invention.

FIG. 2 is a plan sectional view of the friction damper according to the embodiment of the present invention.

FIG. 3 is a side sectional view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

12 Lower foundation (support structure) 16 Upper foundation (Seismic isolation target) 30 friction damper 34 Pressure contact plate (plate material) 36 Coupling member (coupling part) 40 Pressure contact plate (plate material) 46 volts 50a disc spring 56 Square Steel Pipe (Steel Pipe)

Claims (2)

[Claims] 1. A damper of a vibration isolator interposed between an object to be isolated and a support structure thereof, wherein a plurality of plate members are overlapped with each other so that the bolts and nuts can move in a predetermined direction while sliding relative to each other. A friction damper is provided with a disc spring that joins them and applies a pressing force to the plate members by the bolts, and the plate members that are in pressure contact with each other are end portions on opposite sides in the moving direction. A damper for a vibration isolator, comprising a coupling part, and the coupling part being rotatably attached to the seismic isolation target and the support structure, respectively. 2. The plate material is polymerized over the entire area between the both coupling portions, and the bolt / nut and the disc spring are provided at the polymerized portion, and the friction damper is a steel pipe for preventing buckling deformation of the plate material. The damper of the vibration isolator according to claim 1, characterized in that the outer periphery is covered.