JP2014084970A - Seismic isolation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolation member which is interposed substantially between an earthquake motion generation surface side and a seismic isolation target member side and, thereby, exhibits seismic isolation actuation even for an earthquake having either short-period earthquake ground motion or long-period earthquake ground motion.SOLUTION: A seismic isolation member is configured such that a concave shape surface forming member 1 having a control-guiding concave shape arcuate part 1b is attached to an earthquake motion generation surface side, a convex shape surface forming member 2 having a control-guiding convex shape arcuate part 2b is attached to a seismic isolation target member side, and the concave shape surface forming member 1 and the convex shape surface forming member 2 are supported in an opposite state which keeps a predetermined interval via a columnar support provided with flexibility.

Description

  The present invention relates to a seismic isolation member that is provided with a seismic isolation effect when an earthquake occurs mainly by being interposed between a seismic vibration generating surface side and a seismic isolation target member side.

  Conventionally, for example, in a mechanism for seismic isolation against earthquake vibration, a supporting member (small bar-shaped member) that exhibits a columnar shape as a member for absorbing rolling or the like is usually a rubber column such as laminated rubber. (For example, see Patent Document 1).

JP 2006-292155 A

  In the case of the rubber column as described above, it is very difficult to adjust its flexibility and stretchability, and it is almost left to the characteristics of the rubber material. Therefore, for example, when a rubber column having a large strength is used, its flexibility is too strong, and the seismic isolation action is disturbed.

  In addition, there are short-period ground motions (around 1 second) and long-period ground motions (periods of 5 seconds or more). Earthquakes are seismic isolation devices that rely on rubber columns as described above, and are short pitch vibrations. Even if it is possible to deal with periodic ground motions, if long-period ground motions that are rolling vibrations occur, the amplitude is large, so the amplitude cannot be accommodated due to insufficient length, and the length is long enough to accommodate. It was estimated that buckling and the like would occur when using the same one.

  Therefore, in the past, it became necessary to install two seismic isolation members for short-period vibration and long-period vibration, which inevitably resulted in problems such as high installation costs and complicated construction work. Accompanied.

  The present invention is intended to provide a new product called “a member for seismic isolation” which intends to eliminate such conventional problems.

According to the present invention, the concave surface forming member 1 formed by projecting the control guide concave arc-shaped portion 1b having the lowest height at the center on the upper surface of the horizontal base 1a is formed as described in claim 1. A convex surface forming member 2 formed by projecting a convex arcuate portion 2b for control guidance on the lower surface of the horizontal base 2a, which is attached to the surface side A and has the center of the lower surface at the lowest height, The concave surface forming member 1 and the convex surface forming member 2 are supported in a state of being opposed to each other at a predetermined interval via a flexible columnar support, and are convex with the concave surface forming member 1. Based on the horizontal displacement movement of the surface forming member 2, long-period ground motion is absorbed in a seismic manner, and when the displacement movement is maximized, the control guidance for the periphery of the concave arcuate portion 1 b for control guidance is provided. The seismic isolation member is configured such that the convex arcuate portion 2b has a stopper action based on a collision.

The present invention provides a coil in which a rubber shaft 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A and suspended on the seismic isolation target member side B as described in claim 2 The spring 2 is slidably fitted to the rubber shaft 1, and the rubber shaft 1 is based on the expansion and contraction motions of the vertical vibrations and the short-period ground motions having a fast period. In the case of a large and slow vibration such as a long-period ground motion, the base is made to adapt to the length that can handle the vibration based on the sliding elasticity of the rubber shaft 1 and the coil spring 2. Accordingly, the seismic isolation member according to claim 1 or 2 configured to cause seismic isolation operation is an embodiment.

As described in claim 3, the present invention implements the seismic isolation member according to any one of claims 1 and 2, wherein the seismic vibration generating surface is the ground, and the building isolation member is the seismic isolation target member. Let it be an aspect.

  According to the present invention, as described in claim 4, as a columnar support body having flexibility, a coil spring 4 is erected on the convex surface forming member 2 side, and rubber having flexibility and stretchability is provided. The shaft-making body 3 is suspended from the convex surface forming member 2 side, and the rubber shaft body 3 is slidably fitted to the spring 4. The seismic isolation member described in the above is an embodiment.

The present invention has a configuration as described in claim 1, that is, a concave surface forming member 1 formed by projecting a control guide concave arc-shaped portion 1 b having the lowest height at the center on the upper surface of the horizontal base 1 a, A convex surface forming member 2 that is mounted on the seismic vibration generating surface side A and has a convex arcuate portion 2b for control guidance with the center of the bottom surface at the lowest point protruding from the bottom surface of the horizontal base 2a is subject to seismic isolation. The concave surface forming member 1 is attached to the member side B, and supports the concave surface forming member 1 and the convex surface forming member 2 in a facing state with a predetermined interval therebetween via a flexible columnar support. Based on the horizontal displacement of the convex surface forming member 2, long-period ground motion is absorbed in a seismically isolated manner, and when the displacement is maximized, the control guide concave arc-shaped portion 1b is Since the control guide convex arc-shaped part 2b is configured to have a stopper action based on a collision, a long-period earthquake There when generated, the seismic isolation absorption operation is achieved. And, in the case of such a large vibration that the long-period ground motion exceeds the capability of the seismic isolation member according to the present invention, since an automatic stopper action is exerted, the seismic motion generation surface side A and the seismic isolation target member side B, This will often prevent the occurrence of a situation where both parties are disconnected.

In the present invention, the rubber shaft 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A and suspended from the seismic isolation target member side B. The provided coil spring 2 is slidably fitted to the rubber shaft 1, and the rubber shaft 1 can be expanded and contracted with respect to vertical vibrations and short-period ground motions having a fast period. In the case of a large, slow vibration such as a long-period ground motion that causes seismic isolation based on the swing motion, the length that can handle the vibration based on the sliding elasticity of the rubber shaft 1 and the coil spring 2 Because it is configured to have a seismic isolation action by quickly adapting to the two types of vibration, there are two types of vibration, short-period ground motion and long-period ground motion, with significantly different directions, speeds, and amplitudes. Can demonstrate seismic isolation against earthquakes . Therefore, the problems such as the increase in the installation cost and the complexity of the construction work, which are the conventional problems that depend on different seismic isolation members, are completely solved.
In addition to the use as a seismic isolation member for a structure on the ground surface, it is also possible to use it as a seismic isolation member for, for example, art on the floor or a computer.

The present invention is widely implemented as a general building seismic isolation member by using the structure as claimed in claim 3, that is, the seismic vibration generating surface A as the ground and the seismic isolation target member B as a building construction member. Is planned.

  According to the present invention, the coil spring 4 is erected on the convex surface forming member 2 side as a columnar support body having flexibility, that is, flexible and stretchable. The rubber shaft body 3 provided is suspended from the convex surface forming member 2 side, and the rubber shaft body 3 is slidably fitted to the spring 4 so that the rubber shaft body 3 is slidably fitted. Even if it is a form, there can exist an effect similar to this. Therefore, implementation in this form is not hindered depending on construction convenience.

It is sectional drawing for description of this invention showing the operation state with respect to the rolling of an earthquake. It is a longitudinal cross-sectional view for description of this invention in a normal state. It is a perspective view showing the upper surface of the concave surface formation member which is a summary member of the present invention. It is the perspective view which turned over the convex surface formation member which is a summary member of the present invention, and expressed the undersurface.

  FIG. 2 is a cross-sectional view illustrating a state in which the seismic isolation member according to the present invention is attached between the seismic vibration generating surface side A and the seismic isolation target member side B. In FIG. 3, reference numeral 1 denotes a concave surface forming member, and as shown in FIG. 3, a control guide concave arc-shaped portion 1b having a center at the lowest height is provided on the upper surface of the horizontal base 1a. In the embodiment shown in the drawings, the horizontal base 1a has a regular square shape. However, the present invention is not limited to this. For example, a circular shape or the like is acceptable.

  Reference numeral 2 denotes a convex surface forming member, as shown in FIG. 4, where the center of the lower surface of the horizontal base 2 a is the lowest part (in FIG. 4, the highest part is drawn in the figure in the inverted state). A convex convex arcuate portion 2b for control guidance is provided. In the embodiment shown in the drawings, the horizontal base 2a has a regular square shape. However, the present invention is not limited to this. For example, a circular shape or the like is acceptable.

  The above-described concave surface forming member 1 is fixed on the upper surface of the seismic vibration generating surface side A, and the convex surface forming member 2 is fixed on the lower surface of the seismic isolation target member side B. The arcuate portion 1b and the control guide convex arcuate portion 2a are configured to face each other at a predetermined interval via a seismic isolation means comprising a columnar support described below.

  By the way, in principle, the control guide concave arcuate portion 1b and the control guide convex arcuate portion 2b are provided with arcuate curved surfaces that can be matched with each other. However, it is not limited to this. That is, when long-period ground motion occurs and the opposing horizontal arc-shaped portions 1b and 2b move in a relative horizontal direction, and when the amount of shift is more than can be handled, as shown in FIG. It is intended to prevent further displacement movement motion by the control guide convex arcuate portion 2b abutting against the height of the control guide concave arcuate portion 1b. Is. Accordingly, any arc-shaped portion is acceptable as long as it has an arc shape that can achieve such an object.

  The above-described seismic isolation means comprising a columnar support for the control guide concave arc-shaped portion 1b and the control guide convex arc-shaped portion 2a has the following configuration.

Reference numeral 3 denotes a rubber shaft, which is erected at the four corners of the horizontal base 1a of the concave surface forming member 1. A coil spring 4 is slidably fitted to the shaft body 3, and is suspended from the four corners of the horizontal base 2a of the convex surface forming member 2.

In the illustrated embodiment, the rubber shaft 3 is positioned on the seismic vibration generating surface side A, and the coil spring 4 is positioned on the seismic isolation target member side B. However, this may be reversed, that is, the coil spring 4 may be provided on the seismic vibration generating surface side A, and the shaft body 3 may be provided on the seismic isolation target member side B. The present invention may be implemented in such a form.

  The main object of the present invention is to use the seismic vibration generating surface side A as the ground surface and the seismic isolation target member side B as a construction member such as a building as a seismic isolation member for general structures. However, the seismic vibration generating surface side A can be used as a floor of a building, and the seismic isolation target member side B can be a protected object such as art or a computer.

By the way, the rubber shaft body 3 described above has the required flexibility and stretchability. The coil spring 4 described above has the required flexibility (warping and its restoration).

  In principle, the rubber shaft 3 is fixed using a required adhesive. However, if it is possible to achieve strong fixing, other than this, for example, an anchor bolt or the like is used. It may be configured. Further, it may be configured such that it can slide in the concave hole 5 without being fixed. In this case, fixing means such as the adhesive coating layer is omitted. In some cases, a gear-like protrusion is formed on the flange-like portion at the lower end of the rubber shaft 1 so as to be engageable with the inner wall of the concave hole 5.

Reference numeral 6 denotes a fixing agent filling portion of the coil spring 4, which is mainly formed by filling concrete or the like, but any other suitable means can be used as long as it has strength.

By the way, in the embodiment shown in the drawings, the lower end of the rubber shaft 3 is positioned in the concave hole 5, which is used for adjusting the length of the exposed portion and for the adhesive 3 described above. When the lower end of the rubber shaft 1 is moved freely without being used, it also plays a role of regulating the lateral movement distance.

  When the present invention is used as a seismic isolation member for a structure such as a building, for example, as shown in FIG. The seismic isolation action is performed by fixing 2 to the seismic isolation target member side B, respectively. In addition, this invention shall be normally attached to several places as mentioned above.

In the state shown in FIG. 2, when short-period ground motion is detected, if this is a roll, the rubber shaft 3 causes a swinging motion with the lower end side, that is, the seismic vibration generating surface side as a moving point. Depending on the situation, the transmission of the vibration to the seismic isolation target member side is absorbed and the seismic isolation effect is exhibited.

  Further, in the case of pitching, the rubber shaft 3 is absorbed based on the expansion and contraction action in the axial direction, and the transmission of vibration to the building side is learned and the seismic isolation action is exhibited. At this time, if the rubber shaft 3 is excessively expanded based on extremely strong vertical vibration, the coil spring 4 fitted to the outer periphery of the rubber shaft 3 is prevented from over-expanding and buckling. To prevent that.

  And when long-period ground motion occurs, the ground motion is large and slow in the lateral direction (lateral vibration with a period of 5 seconds or more), so as shown in FIG. If the rubber shaft 3 swings in response to the large swing amplitude and the amplitude of the earthquake becomes larger than the vertical length in the state shown in FIG. 1, the rubber shaft 3 is pulled out from the spring 4. Is expanded to correspond to the amplitude length, and when restoring the vibration, it expands and contracts and then expands again. By exhibiting such expansion and contraction, it absorbs long-period ground motion based on repetitive movement in the direction indicated by the arrow in Fig. 1 on the seismogenic ground side A (based on movement in response to earthquake motion), Seismic isolation is achieved.

  When the long-period ground motion is extremely large and exceeds the assumed capacity of the present invention, the control guide is provided to the peripheral edge portion having a high height as shown in FIG. Due to the contact of the convex arcuate portion 2b for use, further displacement movement is prevented. That is, a stopper action is exhibited.

  The present invention can be used as a seismic isolation member for works of art, computer equipment, etc. placed on the floor, for example, in addition to the use for seismic isolation for construction members such as buildings. The invention can also be used in such usage.

A Earthquake vibration side
B Seismic isolation object side 1 Concave surface forming member
1a Foundation
1b Concave arc-shaped part for control guidance 2 Convex surface forming member
2a Foundation
2b Convex arcuate part for control guide 3 Rubber shaft 4 Coil spring 5 Concave hole 6 Fixing agent filling part

Claims (4)

A concave surface forming member (1) formed by protruding a concave arc-shaped portion for control guidance (1b) with the center at the lowest part on the upper surface of the horizontal base (1a) is placed on the seismic vibration generating surface side (A). Installation,
The convex surface forming member (2) formed by projecting a convex arcuate portion (2b) for control guidance with the lowest center at the bottom surface on the lower surface of the horizontal base (2a) B)
The concave surface forming member (1) and the convex surface forming member (2) are supported in a facing state at a predetermined interval via a columnar support body having flexibility, and the concave surface forming member (1). And the convex surface forming member (2) absorb the long-period ground motion in a seismically isolated manner based on the horizontal displacement, and when the displacement is maximized, the control guide concave arc (1b ) Related to the seismic isolation portion configured so as to exhibit a stopper action based on the contact of the control guide convex arcuate portion (2b) with the periphery.   As a columnar support having flexibility, a rubber shaft (3) having flexibility and stretchability is erected on the concave surface forming member (1) side, and a convex surface forming member (2). A coil spring (4) suspended from the side is slidably fitted to the rubber shaft (3), and the rubber shaft (3) has a short vertical vibration and short vibration. For periodic earthquake motion, seismic isolation is generated based on the expansion and contraction and swing motion, and in the case of slow large vibration such as long-period ground motion, the sliding between the rubber shaft (3) and the coil spring (4). The seismic isolation member according to claim 1, wherein the seismic isolation operation is performed by promptly adjusting a length corresponding to the vibration based on dynamic elasticity. The seismic isolation member according to claim 1, wherein the seismic vibration generating surface is the ground, and the building isolation member is a seismic isolation target member.   As a columnar support having flexibility, a coil spring (4) is erected on the convex surface forming member (2) side, and a rubber shaft (3) having flexibility and stretchability is convex. Any one of Claims 1 to 3, wherein the rubber shaft (3) is slidably fitted to the spring (4). The seismic isolation member described in Crab.