JP2006291670A - Base isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with a rolling of a small amplitude on a structure side due to an earthquake or the like. <P>SOLUTION: A base isolation bearing, interposed between the ground B and the structure A and isolating a oscillation to support the structure A, is composed of a main elastic bearing 11 with a sliding bearing 12 or a rolling bearing 13 as a subordinate member, or an elastic composite bearing 1 vertically connecting elastic bearings 14. Furthermore, a dumper 2 for a small amplitude for suppressing the rolling acceptable by the elastic bearing 11 on the structure A is connected to the main elastic bearing 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device capable of dealing with a roll having a small amplitude when compared with a ground side due to an earthquake or the like on a structure side.

  There have been various proposals for seismic isolation devices that can deal with rolling on the structure side relative to the ground side caused by earthquakes, etc., but this seismic isolation device is composed of the ground side and the structure side. As a seismic isolation bearing for large amplitudes, which functions to prevent the ground side roll from being input to the structure side, that is, the structure side is isolated from and supported by the ground side roll. For example, as disclosed in Patent Document 1, a laminated rubber body, that is, a laminate of a rubber plate and a metal plate is well known.

  On the other hand, in this type of seismic isolation device, for example, if half of the laminated rubber bodies that are seismic isolation bearings for large amplitudes are compared with laminated rubber bodies, they are replaced with sliding bearings that have no restoring force. It is well known that the seismic isolation effect in seismic devices is increased.

  However, in this sliding bearing, the ground side and the structure side are brought into surface contact with each other by a sliding surface. Therefore, before the sliding bearing starts to slide due to the frictional force at the time of this surface contact, the ground side has a small amplitude side. If a swing is input to the structure side to make it easy to slip in the sliding bearing to avoid this, it is pointed out that the sliding frequency increases and the posture on the building side tends to change, and the laminated rubber is used for the sliding bearing. Since the restoring force as much as the body cannot be expected, it is also pointed out that it is difficult to return the posture on the structure side.

  Therefore, as disclosed in Patent Document 2, in the elastic sliding bearing in which the elastic bearing is coupled to the sliding bearing, the roll having a small amplitude on the ground side before the sliding bearing starts to slide is elastically supported. While a certain rubber deformation allows it to escape, after the predetermined deformation of the rubber is exceeded, the sliding bearings deal with it, and furthermore, it is elastic against rolls with large amplitude on the ground side due to earthquakes, etc. As a large-amplitude seismic isolation bearing attached to a sliding bearing, for example, a proposal has been made that a laminated rubber body copes with it.

Therefore, in the proposal disclosed in Patent Document 2, for example, when a roll having a small amplitude on the ground side due to an earthquake or traffic vibration is input to the structure side, the structure is formed by elastic sliding support. When the roll on the ground side becomes a large amplitude due to an earthquake or the like, for example, a large-amplitude immunity composed of a laminated rubber body disclosed in Patent Document 1 can be avoided. It will be possible to avoid the structure side rolling due to the seismic support.
JP 2005-54447 A (paragraphs 0003, 0009, 0012, 0014, 0026, 0027, FIGS. 1 and 2) Japanese Patent Laid-Open No. 11-190149 (Claims Claim 4, Paragraph 0012, FIG. 3)

  However, in the conventional seismic isolation device having the elastic sliding bearing described above, it is pointed out that this cannot be effectively suppressed when the structure side rolls with a small amplitude due to an earthquake or traffic vibration. There is a possibility that.

  That is, in the elastic sliding bearing in the seismic isolation device disclosed in the above-mentioned Patent Document 2, since the elastic bearing is provided between the ground side and the structure side, a small amplitude roll on the ground side is provided. However, even if the ground side rolls can be suppressed, the small amplitude rolls on the structure side cannot be quickly subsided, and therefore the structure side will roll finely indefinitely. For example, there is a concern that when the structure is made a residence, the habitability is lowered.

  By the way, in this type of seismic isolation device, in many cases, a large amplitude composed of a laminated rubber body etc. that supports the structure side by isolating the structure side against a roll on the ground side that becomes a large amplitude due to an earthquake or the like. It is assumed that a damper is added to the seismic isolation bearing for use, but this damper is intended to calm the large-amplitude roll on the structure side where the laminated rubber body, which is a large-amplitude seismic isolation bearing, is bent. Therefore, it is well known that it is not suitable for calming down the roll on the side of the structure having a small amplitude due to the above-mentioned earthquake or traffic vibration, and a favorable vibration control effect cannot be obtained.

  The present invention was devised in view of the above-mentioned circumstances, and the object of the present invention is to cope with the roll on the side of the structure having a small amplitude caused by an earthquake or the like, and its versatility. It is to provide a seismic isolation device that is optimal for expecting improvement.

  In order to achieve the above-mentioned object, the structure of the seismic isolation device according to the present invention is basically arranged between the ground side and the structure side, and the structure side is isolated from the ground side roll. In the seismic isolation device having the seismic isolation bearing to be supported, the seismic isolation bearing comprises a sliding bearing or a rolling bearing or an elastic composite bearing in which the elastic bearing is vertically connected to the main elastic bearing. Suppose that the main elastic bearing is connected to a small-amplitude damper that calms the rolling on the side of the structure that the elastic bearing allows.

More specifically, in the elastic composite bearing, the elastic bearing is at the upper end side and the upper end is connected to the structure side, and one end of the small amplitude damper is connected to the lower end of the elastic bearing in the elastic composite bearing and the other end. Is connected to the structure side.

  Therefore, in the present invention, since the seismic isolation device has the elastic composite bearing as the seismic isolation bearing, the main elastic bearing in this elastic composite bearing is allowed to roll on the side of the structure having a small amplitude. However, at that time, the damper for small amplitude functions, and its damping action calms down the small-amplitude roll on the structure side, that is, it can cope with the roll with a small amplitude on the structure side. Become.

  At this time, one end of the small-amplitude damper, the other end of which is connected to the structure side, is connected to the main elastic bearing in the elastic composite bearing, so that the roll having a small amplitude on the structure side allowed by the main elastic bearing can be prevented. It can calm down efficiently.

  And, for example, while having a large-amplitude seismic isolation bearing made of a laminated rubber body that segregates and supports the structure side against a roll on the ground side resulting in a large amplitude due to an earthquake, etc. The seismic isolation device according to the present invention, that is, the seismic isolation bearing is composed of an elastic composite bearing, is added to the conventional seismic isolation device in which a large-amplitude damper that suppresses a large amplitude swing on the structure side is added to the seismic isolation bearing for the building. At the same time, when the seismic isolation device having a small-amplitude damper connected to the elastic composite bearing is installed, it is possible to effectively cope with the roll on the structure side from the large amplitude to the small amplitude. .

  As a result, according to the present invention, it is possible to cope with at least the roll on the structure side resulting in a small amplitude caused by an earthquake or the like, and by attaching to the conventional seismic isolation device, the conventional seismic isolation device It is ideal for expecting improvement in versatility.

  Hereinafter, the present invention will be described based on the illustrated embodiment. The seismic isolation device according to the present invention has a ground B as shown in principle in FIG. 1 and as specifically shown in FIG. It is distributed between the side of the building and the side of the building A and functions so that the roll of the ground B side is not input to the side of the building A. That is, the structure A side is isolated from and supported by the roll of the ground B side. Have seismic isolation bearings.

  At this time, in the seismic isolation device according to the present invention, the seismic isolation bearing is composed of the elastic composite bearing 1, and the small amplitude damper 2 for calming the small amplitude roll on the structure A side to the elastic composite bearing 1. Are connected.

  Incidentally, the large-amplitude seismic isolation support S shown in FIG. 2 is to support the structure A side by isolating the structure A side against a roll having a large amplitude on the ground B side due to an earthquake or the like. Assume that a rubber body, that is, a structure in which a rubber plate and a metal plate are laminated is formed.

  Therefore, this seismic isolation bearing S for large amplitudes is less susceptible to small amplitudes due to earthquakes, traffic vibrations, etc., because the structure A side is seismically isolated from the rolls that cause large amplitudes on the ground B side due to earthquakes. Therefore, the structure in which the small-amplitude damper 2 to be described later is connected to the large-amplitude seismic isolation bearing S is the structure of the present invention. It can be said that it is not.

  In addition, in the conventional seismic isolation device having the above-described large-amplitude seismic isolation bearing S, although not shown, the other end of the large-amplitude damper whose one end is connected to the structure A side is connected to the ground B side. The large-amplitude damper is supposed to contribute to calming the roll having a large amplitude on the structure A side caused by an earthquake or the like.

  By the way, in the present invention, the elastic composite bearing 1 is composed of a so-called complex in which the main elastic bearing 11 is connected with another seismic isolation bearing element as a sub, and in the place shown in FIG. It is assumed that it is formed in a mode of an elastic sliding bearing in which a sliding bearing 12 serving as a subordinate is connected to the bearing 11.

  In the elastic composite bearing 1, the main elastic bearing 11 is, for example, a so-called spring element mainly composed of rubber, as shown in FIG. 2, and the secondary sliding bearing 12 is formed on the ground B side. The sliding surface 12a and the sliding member 12b disposed on the main elastic bearing 11 side and in surface contact with the sliding surface 12a are provided.

  Therefore, in this elastic composite bearing 1, when there is a roll on the ground B side having a small amplitude due to an earthquake or traffic vibration, the secondary sliding bearing 12 has a small frictional force due to its surface contact. The situation is such that the roll with the amplitude is directly input to the structure A side. In other words, the roll through the sub-sliding bearing 12 functions as the main elastic bearing 11, that is, the main elastic bearing 11 is moved. Due to the deformation of the rubber to be formed, it is possible to prevent the roll having the small amplitude from being input to the structure A side.

  Next, this seismic isolation device has a small-amplitude damper 2 that calms the small-amplitude roll on the side of the structure A. This is because the elastic composite bearing 1 described above is used for earthquakes and traffic. This is because the roll on the side of the structure A having a small amplitude due to vibration or the like is allowed.

  That is, the above-described elastic composite bearing 1 is isolated from the structure A side against the roll on the ground B side having a small amplitude due to an earthquake or traffic vibration, but at this time, it is completely insulated from the ground B side. Therefore, the structure A side rolls with a small amplitude with a longer period than the roll on the ground B side.

  And when the structure A side actually rolls with a small amplitude due to the roll on the ground B side due to an earthquake or traffic vibration, for example, when the structure A is a residence, the comfortability in this residence Therefore, the roll at the small amplitude on the side of the structure A needs to be quickly subsided, and the small amplitude damper 2 according to the present invention embodies this.

  Therefore, the small-amplitude damper 2 is configured to generate a damping force during the expansion / contraction operation so as to allow so-called energy absorption. In general, an oil damper as a fluid damper is selected. However, considering that it is a part that constitutes a seismic isolation device distributed between the structure A side and the ground B side, a damper that uses water as a fluid is selected even with the same fluid damper. Of course, it's also good.

  Although not shown, the small-amplitude damper 2 described above is capable of adjusting the generated damping force with an external signal, enabling selection of the timing at which the expansion / contraction operation is performed, or allowing expansion / contraction. Of course, it may be set arbitrarily, such as making it impossible to select.

  By the way, the above-described small amplitude damper 2 is connected to the elastic composite bearing 1 as follows.

  That is, in the elastic composite bearing 1 shown in FIGS. 1 and 2, the main elastic bearing 11 is on the upper end side, and the upper end of the main elastic bearing 11 is connected to the structure A side, and for small amplitude. One end of the damper 2 is connected to the lower end of the main elastic support 11, and the other end is connected to the structure A side.

  As a result, the small-amplitude damper 2 can effectively calm down the roll that has a small amplitude on the side of the structure A that is permitted by the main elastic support 11 to which the small-amplitude damper 2 is coupled.

  Therefore, the seismic isolation device according to the present invention formed as described above has a large-amplitude seismic isolation support S made of a laminated rubber body, for example, as shown in FIG. In the case where the conventional seismic isolation device is provided with a large-amplitude damper, the roll on the structure A side from the large amplitude to the small amplitude is assumed. It can be effectively dealt with.

  As a result, according to the present invention, at least it can cope with the roll on the side of the structure A having a small amplitude caused by an earthquake, traffic vibration, etc. It becomes possible to add value to the conventional seismic isolation device, and not only the seismic isolation device according to the present invention but also the improvement in versatility of the conventional seismic isolation device can be expected.

  As described above, the elastic composite bearing 1 in the seismic isolation device according to the present invention is formed in the form of the elastic sliding bearing in which the main elastic bearing 11 is connected to the sliding bearing 12 as the sub. From the point of view of the function of the bearing 1, instead of the sliding bearing 12 serving as a subsidiary, as shown in FIG. 3, it may be formed as a rolling bearing 13 serving as a subsidiary and formed in the form of an elastic rolling bearing. I can say.

  That is, when comparing the secondary sliding bearing 12 and the secondary rolling bearing 13, the secondary rolling bearing 13 is clearly superior in responsiveness to roll to the secondary sliding bearing 12. It may be said that there is little need to connect the secondary rolling bearing 13 to the main elastic bearing 11 to make the elastic composite bearing 1 according to the present invention, but as a result, when the structure A side rolls with a small amplitude, In view of the necessity of calming down, it can be said that it is meaningful that the small-amplitude damper 2 is also connected to the elastic composite bearing 1 formed in the form of this elastic rolling bearing.

  In addition, in the above description, the main elastic bearing 11 in the elastic composite bearing 1 is connected to the structure A side, and the sliding bearing 12 serving as the auxiliary in the elastic composite bearing 1 is connected to the ground B side. As shown in FIG. 4, the main elastic bearing 11 in the elastic composite bearing 1 may be connected to the ground B side, and the sliding bearing 12 serving as a subsidiary in the elastic composite bearing 1 may be connected to the structure A side. Even in the case, the structure A side rolls to a small amplitude due to the roll on the ground B side, and it is also suitable for calming down when the structure A side rolls to a small amplitude by the wind. .

  And in the place mentioned above, the elastic composite support 1 which can embody a remarkable so-called lateral movement state by connecting the secondary sliding support 12 or the secondary rolling support 13 to the main elastic support 11. From the viewpoint that the lateral movement state of a predetermined stroke can be realized, as shown in FIG. 5, the elastic composite bearing 1 has an elastic bearing that is another subordinate to the main elastic bearing 11. Of course, it is good also as a structure which connects 14.

  Incidentally, in the case of the form shown in FIG. 5, the main elastic support 11 and the secondary elastic support 14 are connected under the intervention of a rigid body 15 such as a steel plate, and the spring coefficient in the secondary elastic support 14 Is set to be larger than the spring coefficient of the main elastic support 11, and although not shown, it is preferable to set the expansion and contraction of the main elastic support 11 to have a predetermined displacement restriction.

It is a figure which shows in principle the seismic isolation apparatus by this invention. It is a figure which shows one Embodiment of the seismic isolation apparatus by this invention. It is a figure which shows the other form of the seismic isolation apparatus by this invention similarly to FIG. It is a figure which shows the other form of the seismic isolation apparatus by this invention similarly to FIG. It is a figure which shows the other form of the seismic isolation apparatus by this invention similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic composite bearing which is a seismic isolation bearing 2 Small amplitude damper 11 Primary elastic bearing 12 Secondary sliding bearing 13 Secondary rolling bearing 14 Secondary elastic bearing A Structure B Ground S Seismic isolation bearing for large amplitude

Claims (3)

In seismic isolation devices that have seismic isolation bearings that are distributed between the ground side and the structure side and that isolate and support the structure side against rolling of the ground side, the seismic isolation bearing is the main elastic bearing It consists of a secondary sliding bearing, a rolling bearing, or an elastic composite bearing in which an elastic bearing is connected in the vertical direction, and a small-amplitude damper that calms the rolling on the structure side that the elastic bearing allows in the main elastic bearing. Seismic isolation device characterized by being connected In the elastic composite bearing, the elastic bearing is the upper end side and the upper end is connected to the structure side. In the damper for small amplitude, one end is connected to the lower end of the elastic bearing in the elastic composite bearing and the other end is connected to the structure side. The seismic isolation device according to claim 1. A large-amplitude seismic isolation bearing consisting of a laminated rubber body that is distributed between the ground side and the structure side and that isolates and supports the structure side against the roll of the ground side is attached to the elastic composite bearing. The seismic isolation device according to claim 1

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