JP2002070943A - Seismic isolation sliding bearing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To exhibit a trigger function and a damper function equivalent to a metal rod damper, and to have a vertical load supporting capacity equal to or greater than that of a laminated rubber, and to provide a certain level of horizontal vibration force due to an earthquake or the like. To sufficiently attenuate and achieve a significant improvement in seismic isolation performance. SOLUTION: One elastic rubber layer 5 is vulcanized and bonded between upper and lower hard plates 3 and 4, and has a shape factor of 10 or more and 5 or more.
In the upper part of the vibration damping part 1 which is set to 0 or less and fixed to the lower structure B side, the upper structure is attached to the hard plate material 10 fitted and held via the elastic rubber 12 in the concave portion 11a of the concave hard member 11. A sliding support portion 2 having a sliding plate 9 fixedly slidably contacting the lower surface of a sliding member 8 fixed to the A side is fixedly connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal vibration force input when an earthquake occurs, for example, by being interposed between an upper structure such as a building or a bridge and a lower structure such as a foundation or a pier. The present invention relates to a seismic isolation sliding bearing device used to prevent damage to an upper structure by absorbing vibration and reducing vibration acceleration.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, as shown in FIG. 3, metal plates 21 and 22 are fixed to the lower surface of an upper structure A and the upper surface of a lower structure B, respectively. A sliding bearing formed by sliding a stainless steel plate directly adhered and fixed to the upper and lower opposing surfaces of these metal plates 21 and 22 and sliding plate members 23 and 24 such as a fluororesin plate having a small friction coefficient so as to be relatively movable in the horizontal direction. As shown in FIG. 4, in order to be able to absorb the device 25 and the rotational force in the vertical direction,
A metal cylindrical member 26 is fixed on the upper surface of the lower structure B, an elastic rubber sheet 27 is inserted and laid inside the cylindrical member 26, and a metal plate is placed on the elastic rubber sheet 27 in the same manner as described above. A sliding bearing device 32 is known in which a stainless steel plate directly adhered and fixed to the upper and lower opposed surfaces of 28 and 29 and sliding plate members 30 and 31 such as a fluororesin plate having a small friction coefficient are slidably contacted in a horizontal direction so as to be relatively movable. Have been.

[0003] The sliding bearing devices 25 and 32 as described above.
When the horizontal vibration force is input to the lower structure B due to the occurrence of an earthquake or the like, the sliding plate members 23, which are in sliding contact with each other,
The vibration force is attenuated by the relative sliding movement of 24 or 30, 31 in the horizontal direction, thereby reducing the transmission of the horizontal vibration force to the upper structure A and exerting the seismic isolation performance. However, these sliding bearing devices 25 and 32 are provided with sliding members 23 and
24 or 30, 31 are replaced with metal plates 21, 22, or 28,
29, which is directly attached and fixed, and does not serve to absorb the horizontal impact force due to an earthquake or the like.
It largely depends on the coefficient of friction of 24 or 30,31.

Incidentally, the friction coefficient of the sliding bearing device tends to increase in accordance with a change in vibration acceleration. When an earthquake or the like having a large vibration acceleration occurs, the upper structure A has a friction coefficient corresponding to the vibration acceleration. Since the value obtained by multiplying the vertical load due to the loading of the upper structure becomes the horizontal vibration force input to the upper structure, a fluororesin plate having a somewhat low coefficient of friction was used as one of the sliding members 23, 24 or 30, 31. Even in such a case, there is a problem that the horizontal vibration force input to the upper structure is large, and sufficient seismic isolation performance cannot be exerted to avoid damage due to an earthquake or the like.

[0005] As a seismic isolation sliding bearing device which overcomes such problems of the conventional sliding bearing device, there is a conventional sliding bearing for low axial force as disclosed in Japanese Patent Application Laid-Open No. 9-310408. Seismic bearing devices have been proposed. This sliding type seismic isolation bearing device is, as shown in FIG.
A plurality of thin steel plates 41 and an elastic rubber layer 42 are attached to a mounting flange 40 fixed to the upper surface of the side via an anchor bolt or the like.
Are laminated alternately, and the lower end of the laminated rubber body 43 is fixed.
The sliding plate member 44 made of a fluororesin plate is mounted so as to be partially embedded in the thick reinforcing steel plate 45 so as not to be displaced in the horizontal direction. On the other hand, on the lower surface of the metal plate 46 fixed to the lower surface of the upper structure A by bolts or the like,
And a low friction layer 47 which is slidably slidably moved in the horizontal direction.

[0006]

As described above, the sliding bearing (consisting of the sliding plate member 44 and the low friction layer 47).
The conventional seismic isolation sliding bearing device shown in FIG. 5 in which a laminated rubber body 43 is disposed below the sliding plate member 44, even when a horizontal vibration force having a small vibration acceleration such as a micro-scale earthquake acts.
The friction coefficient between the low friction layer 47 and the
47 is horizontally slid relative to each other, and the laminated rubber body 43 is sheared in the horizontal direction, and a horizontal vibration force and an impact force sufficiently against a small-scale to large-scale vibration such as an earthquake are sufficiently generated by a synergistic effect of these. It is possible to reduce the transmission of the vibration force to the upper structure A by attenuating, thereby avoiding damage due to an earthquake or the like.

However, in the conventional seismic isolation sliding bearing device shown in FIG. 5, for example, a steel bar or a lead bar is stretched between the upper structure and the lower structure. Exhibits the trigger function and damper function achieved by a metal rod damper that is configured to reduce the horizontal vibration force due to earthquakes etc. by absorbing the hysteretic energy due to the yielding of the bar when the horizontal vibration force exceeds a certain level It is very difficult to do. On the other hand, the metal rod damper lacks the ability to support a vertical load due to the loading of the upper structure A, and has no restoring characteristics after deformation due to a particularly large vibration action.
It does not function as a long-term seismic isolation device by itself, and must be installed together with a laminated rubber body, etc., and has problems such as high installation cost and a large installation space.

The present invention has been made in view of the above-mentioned circumstances, and has not only a trigger function and a damper function equivalent to those of a metal rod damper, but also a vertical load supporting capacity equal to or greater than that of a laminated rubber. An object of the present invention is to provide a seismic isolation sliding bearing device capable of sufficiently attenuating horizontal vibration force and impact force against vibrations such as a medium- to large-scale earthquake and achieving remarkable improvement in seismic isolation performance. And

[0009]

To achieve the above object, a seismic isolation sliding bearing device according to the present invention is a seismic isolation sliding bearing device interposed between an upper structure and a lower structure. And a vibration damping part which is formed by vulcanizing and bonding one elastic rubber layer between two upper and lower hard plates, and whose shape factor is set to 10 or more and 50 or less and fixed to the lower structure side, A hard plate material having a sliding plate fixed to the lower surface of the sliding member fixed to the upper structure side so as to slidably contact with the lower surface of the sliding member is fitted and held in the concave portion of the concave hard member via elastic rubber. And a sliding bearing portion that is coupled to and arranged in such a manner that both the vibration damping portion and the sliding bearing portion receive a horizontal damper action and a vertical load of the upper structure to exert a supporting action. It is a feature.

[0010] According to the present invention having the above structure, the lower portion of the sliding bearing portion is hard in the vertical direction having a shape factor of 10 or more and 50 or less and does not perform a deformation operation when a horizontal vibration force of less than a predetermined value is applied. When a horizontal vibration force more than a certain level is applied, the vibration damping part that absorbs the vibration force and impact force by shearing deformation of the elastic rubber layer is connected and arranged, so the installation cost and installation of the whole device While keeping the required space small, it not only has a vertical load supporting capacity equal to or greater than that of the laminated rubber body, but also has a metal rod damper when a horizontal vibration force less than a certain level due to wind load or a very small earthquake is applied. It is possible to prevent unnecessary seismic isolation operation by exerting the same trigger function. Further, when a horizontal vibration force exceeding a certain level is applied due to a small to large-scale earthquake or the like, a large damper against horizontal vibration force is generated by horizontal relative sliding movement between a sliding plate constituting a sliding bearing and a sliding member on the upper structure side. It is possible to exhibit the function and sufficiently follow a large deformation, and it is possible to exhibit a very excellent seismic isolation performance in combination with the vibration damping function of the vibration damping section.

[0011] In the seismic isolation sliding bearing device having the above configuration, the area ratio between the sliding plate of the sliding bearing portion and the hard plate of the vibration damping portion is preferably set to 1: 2 to 1: 5, the coefficient of kinetic friction between the sliding plate and the sliding member on the side of the upper structure is reduced uniformly over the entire range of the relative sliding movement range. The transmission of vibration to the upper structure can be greatly reduced by allowing relative sliding movement regardless of the size of the upper structure.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional structure of a seismic isolation sliding bearing device C according to the present invention interposed between an upper structure A such as a building or a bridge and a lower structure B such as a foundation or a pier. FIG. 1 is a plan view of the device, and the seismic isolation sliding bearing device C is composed of a vibration damping portion 1 and a sliding bearing portion 2 which is connected and arranged on an upper portion thereof.

The vibration damper 1 is formed by vulcanizing and bonding one elastic rubber layer 5 between two upper and lower circular hard plates 3 and 4, such as a metal plate. It is set as follows. The vibration damper 1 is fixed to an upper surface of a mounting plate 6 fixed to an upper surface of the lower structure B via an anchor bolt (not shown) or the like.

The sliding bearing 2 is a sliding member 8 such as a mirror-finished stainless steel plate fixed to a circular metal plate 7 such as an iron plate fixed to the lower surface of the upper structure A via an anchor bolt (not shown) or the like. A sliding plate 9 slidably in contact with the lower surface of the sliding plate 9, a hard plate 10 such as a metal plate having the sliding plate 9 fixed to the upper surface thereof, and a concave shape so as to fit and hold the lower half of the hard plate 10 A hollow cylindrical hard member 11 made of metal and a concave portion 1 of the hollow cylindrical hard member 11 are formed.
A sheet-like elastic rubber 12 is embedded between the bottom surface of the inside 1a and the lower surface of the hard plate material 10 in an embedded manner.

The sliding plate 9 of the sliding support portion 2 and the hard plates 3 and 4 of the vibration damping portion 1 have an area ratio of 1: 2
It is set in the range of 1: 5. The sliding plate 9 is preferably made of a fluorine resin, but may be made of, for example, polyethylene, polyacetal, or another synthetic resin having a low friction coefficient.

In the seismic isolation sliding bearing device C constructed as described above, the shape coefficient of the vibration damping portion 1 connected and arranged below the sliding bearing portion 1 is 10 or more and 50 or less and is vertically hard. In addition, it is possible to sufficiently support the vertical load due to the loading of the upper structure A, and the horizontal rigidity is larger than that of the laminated rubber. The deformation operation of the vibration damping unit 1 when a horizontal vibration force less than a certain level acts due to an earthquake or the like is suppressed, and a trigger function equivalent to a metal rod damper can be secured.

However, when a horizontal vibration force exceeding a certain level acts due to a small-scale to large-scale earthquake or the like, a shearing deformation of the elastic rubber layer 5 of the vibration damper 1 sufficiently absorbs a horizontal impact force. In addition to exerting vibration effect, the sliding bearing 2
The sliding plate 9 and the sliding member 8 on the side of the upper structure A slide relative to each other in the horizontal direction and follow a large deformation to sufficiently exhibit a damper function of attenuating a horizontal vibration force. In addition, the combination of the vibration damping function and the damper function makes it possible to exhibit extremely excellent seismic isolation performance that significantly reduces transmission of vibration force to the upper structure A.

In particular, by setting the area ratio of the sliding plate 9 of the sliding bearing portion 2 to the hard plates 3 and 4 of the vibration damping portion 1 in the range of 1: 2 to 1: 5, The coefficient of kinetic friction with the sliding member 8 on the upper structure A side is uniformly reduced over the entire range of the relative sliding movement range. When a certain level of horizontal vibration force acts due to an earthquake or the like, regardless of the magnitude of the vibration force. Transmission of vibration to the upper structure A can be greatly reduced by allowing relative sliding movement quickly.

[0019]

As described above, according to the present invention,
A simple structure in which only a single elastic rubber layer is vulcanized and bonded between two upper and lower hard plates. A vibration damping part whose shape factor is set to 10 or more and 50 or less, and a rotational force in the vertical direction are absorbed. And a sliding bearing that has elastic rubber for the sliding plate and a sliding bearing that is configured to uniformly reduce the dynamic friction coefficient between the sliding plate and the sliding member on the upper structure side over the entire sliding surface. By the way, when the horizontal load is less than a certain level due to wind load or very small earthquake, etc., it is possible to demonstrate the same trigger function as the metal rod damper described above, and when using laminated rubber The same or higher vertical load supporting capacity can be provided. In addition, when a horizontal vibration force exceeding a certain level is applied due to a small-scale to large-scale earthquake or the like, a sufficient vibration absorbing effect in the horizontal direction is exerted by the shear deformation of the elastic rubber layer of the vibration damping unit. At the same time, the horizontal relative sliding movement between the sliding plate of the sliding bearing and the sliding member on the upper structure side can reliably exert the damper function that sufficiently responds to large deformation. Together with this, there is an effect that remarkable improvement in seismic isolation performance for reducing transmission of vibration to the upper structure can be achieved.

In particular, according to the second aspect of the present invention, in addition to the above effects, the coefficient of kinetic friction between the sliding plate and the sliding member on the upper structure side is reduced uniformly over the entire range of the relative sliding movement range, To allow relative sliding movement regardless of the magnitude of the horizontal vibration force such as an earthquake to greatly reduce the transmission of vibration to the upper structure and further improve the specified seismic isolation performance Can be.

[Brief description of the drawings]

FIG. 1 is a sectional structural view of a state in which a seismic isolation sliding bearing device according to the present invention is interposed between an upper structure and a lower structure.

FIG. 2 is a cross-sectional plan view taken along line XX of FIG.

FIG. 3 is a sectional structural view showing an example of a conventional general seismic isolation sliding bearing device.

FIG. 4 is a sectional structural view showing another example of a conventional general seismic isolation sliding bearing device.

FIG. 5 is a cross-sectional structural view of a conventionally proposed seismic isolation sliding bearing device for overcoming the problems of the conventional general seismic isolation sliding bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration suppression part 2 Sliding bearing part 3, 4 Hard plate 5 Elastic rubber layer 8 Sliding member 9 Sliding plate 10 Hard plate material 11 Concave hard member 11a Depression 12 Elastic rubber A Upper structure B Lower structure C Seismic isolation sliding bearing device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) E04H 9/02 331 E04H 9/02 331A 331E (72) Inventor Sakae Ueda Shimouchi shrine in Mita City, Hyogo Prefecture No. 541 No. 1 F-term in the Mita Plant of Nihon Pillar Industry Co., Ltd. (Reference) 2D059 AA36 AA37 GG01 3J048 AA03 BA08 BE12 BG04 DA01 EA38

Claims (2)

[Claims] A seismic isolation sliding bearing device interposed between an upper structure and a lower structure, wherein one elastic rubber layer is vulcanized and bonded between two upper and lower hard plates, And a vibration damping part whose shape factor is set to be 10 or more and 50 or less and fixed to the lower structure side, and a sliding plate fixed to a sliding member fixed to the upper structure side and slidably contacting the lower surface of the sliding member. A plate member is fitted and held in the concave portion of the concave hard member via elastic rubber, and is provided with a sliding support portion which is arranged and coupled to an upper portion of the vibration damping portion. Both of the vibration damping portion and the sliding bearing portion are provided. A seismic isolation sliding bearing device characterized in that it is configured to exhibit a horizontal damper action and a vertical load on an upper structure to exert a support action. 2. The seismic isolation device according to claim 1, wherein an area ratio between the sliding plate on the sliding support portion side and the hard plate on the vibration damping portion side is set in a range of 1: 2 to 1: 5. Sliding bearing device.