JP2014101895A - Base isolation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation member that is interposed mainly between a seismic ground motion generation surface side and a base-isolation object member side to make a base-isolation action exerted on either of earthquakes with short-period and long-period seismic ground motions.SOLUTION: A rubber lower-half-part shaft body 1 with flexibility and stretchability is erected on a seismic ground motion generation surface side A. A rubber upper-half-part shaft body 2 with flexibility and stretchability is suspended on a base-isolation object member side B in such a manner as to be coaxial with the rubber lower-half-part shaft body 1 and at a predetermined interval. A coiled spring 3 is slidably and loosely fitted to both the shaft bodies 1 and 2.

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 the 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 earthquakes and long-period ground motions, which inevitably caused 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 rubber lower half shaft body 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A and has flexibility and stretchability. The rubber upper half shaft body is coaxial with the rubber lower half shaft body and is suspended on the seismic isolation target member side B with a predetermined distance S, and coil springs are applied to both shaft bodies. The seismic isolation member is configured to be slidably fitted freely.

According to the present invention, the rubber lower half shaft body 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A and also has flexibility and stretchability. The rubber upper half shaft body 2 is coaxial with the rubber lower half shaft body 1 and is suspended from the seismic isolation target member side B with a predetermined distance S between the two shaft bodies 1 and 2. The coil springs 3 are slidably fitted to the rubber shafts 1 and 2, and the rubber shafts 1 and 2 have a seismic isolation action based on the shaking motion of the vertical and short-period ground motions. In the case of slow large vibrations such as long-period ground motion, the length corresponding to the ground motion can be quickly adjusted based on the sliding elasticity of the rubber shafts 1, 2 and the coil spring 3. Therefore, the seismic isolation member according to claim 1 configured to exhibit seismic isolation operation is an embodiment.

As described in claim 2, the present invention provides a seismic isolation system according to claim 1, wherein the seismic vibration generating surface side A is the ground and the seismic isolation target member side B is a building construction member. The member is an embodiment.

In the present invention, the rubber lower half shaft body 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A while being flexible and stretchable. The rubber upper half shaft body having the properties is made coaxial with the rubber lower half shaft body and is suspended from the seismic isolation target member side B with a predetermined interval S, with respect to the both shaft bodies. Since the coil spring is slidably fitted freely, a good seismic isolation function can be achieved despite the extremely simple configuration. Based on the existence of the interval S, a seismic isolation action (based on pitch absorption based on the incremental movement of the interval S) against a strong direct earthquake (pitch) is also satisfactorily achieved.

Furthermore, the adjustment of stretchability is not dependent only on the rubber material characteristics of the rubber lower half shaft body 1 and the rubber upper half shaft body 1, and the coil spring 3 can also be adjusted and set in cooperation. Therefore, fine setting of seismic isolation is possible. In addition, the present invention can be used as a seismic isolation member for various structures on the surface such as piers of buildings or bridges, and further as a seismic isolation material for intermediate materials or foundations of tombstones or stone lanterns. It can also be used as a seismic isolation member for cases, various shelves, artwork on the floor, computers, and the like.

In the present invention, the rubber lower half shaft body 1 having flexibility and stretchability is erected on the seismic vibration generating surface side A, and is flexible and stretchable. The upper half shaft body 2 made of rubber is made coaxial with the lower half shaft section 1 made of rubber and is suspended from the seismic isolation target member side B with a predetermined distance S between the two shaft bodies 1. , 2 is slidably fitted to the coil spring 3, and the rubber shafts 1 and 2 are seismically isolated based on the swing motion of short-period ground motion that is vertical vibration or short-period ground motion. In the case of large slow vibrations such as long-period ground motions, the length corresponding to the ground motions can be quickly adjusted based on the sliding elasticity of the rubber shafts 1, 2 and the coil spring 3. Because it is configured to perform seismic isolation operation, it is possible to use a single seismic isolation member for direct earthquake motion, short Period ground motion, and it can exert the direction of vibration of the long period ground motion, speed, the seismic isolation effect on significantly different respective types of seismic shaking width. Therefore, the problems such as the increase in installation cost and the complexity of construction work, which are conventional problems that depend on different seismic isolation members, are completely eliminated.

The present invention is widely used as a seismic isolation member for general constructions, in that the seismic vibration generating surface side A is the ground and the seismic isolation target member side B is a construction member such as a building. Its implementation is planned.

It is sectional drawing for description showing the action | operation with respect to the rolling of this invention. It is sectional drawing for description showing the attachment state of this invention.

  FIG. 2 shows 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 the figure, reference numeral 1 denotes a rubber lower half shaft body having flexibility and stretchability, which is erected and fixed on the side A of the seismic vibration generating surface. Reference numeral 2 denotes a rubber lower half shaft body that is flexible and stretchable, and is suspended from the lower half shaft body 1 on the seismic isolation target member side B in a coaxial line. The ends of the lower half shaft body 1 and the upper half shaft body 2 are coaxially opposed with a predetermined distance S maintained.

  Reference numerals 1a and 2a denote fixing adhesive coating layers for the shafts 1 and 2, respectively. However, the fixing means for the shafts 1 and 2 may be configured to depend on, for example, screwing or other appropriate fixing means without depending on such an adhesive.

3 is a coil spring slidably fitted to both the shafts 1 and 2, and is connected so as to maintain the interlock of the elastic warpage of both shafts 1 and 2. It is.

  The both ends of the coil spring 3 described above are free ends without being fixed, so that the shafts 1 and 2 can move freely.

  The main purpose 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 is used as the floor of the building, and the seismic isolation target member side B is used as an object to be protected, such as art or a computer.

  And when using this invention as a member for seismic isolation with respect to structures, such as a building, for example, it interposes between seismic vibration generating surface side A and seismic isolation object member side B as shown in FIG. The seismic isolation effect is exerted on the structure by arranging it at the required location in the required number.

  In other words, when short-period ground motion is detected in the state shown in FIG. 2, if this is a roll, the rubber shafts 1 and 2 will swing such that the seismic motion generating surface side A is the moving point. By making it occur, it absorbs the transmission of vibrations to the seismic isolation target member side and exhibits seismic isolation.

  Also, in the case of a pitching motion such as a direct earthquake, the vertical movement of both rubber shafts 1 and 2 is based on the existence of the spacing S between the two rubber shafts 1 and 2 in the case of vertical vibration. And absorbs the transmission of vibration), and in the case of rolling like a normal earthquake, it is based on the expansion and contraction action of the coil spring and the shaking movements of the rubber shafts 1 and 2. Is played.

  On the other hand, when a long-period ground motion occurs, the ground motion is large and slow in the lateral direction (a lateral vibration with a period of 5 seconds or more), so as shown in FIG. If the rubber shafts 1 and 2 swing in response to a slow and large swing amplitude, and the amplitude of the earthquake is greater than the vertical length in the state shown in FIG. The seismic isolation effect is achieved without any wrinkles due to the extension action based on the above.

  In other words, by exhibiting the expansion and contraction operation via the spring 3 as described above, based on the repeated movement in the direction indicated by the arrow in FIG. ), Absorbs long-period ground motion, and provides seismic isolation.

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

A Earthquake vibration side
B Seismic isolation object side 1 Rubber upper half shaft
1a Fixing adhesive coating layer 2 Rubber lower half shaft
2a Adhesive layer for fixing 3 Coil spring

Claims (3)

A rubber lower half shaft body having flexibility and stretchability is erected on the seismic vibration generating surface side, and a rubber upper half shaft body having flexibility and stretchability is mounted on the rubber lower shaft. A seismic isolation member configured so as to be coaxial with the half shaft body and suspended at a predetermined interval so that a coil spring is slidably fitted to both shaft bodies.   A rubber lower half shaft body having flexibility and stretchability is erected on the seismic vibration generating surface side, and a rubber upper half shaft body having flexibility and stretchability is mounted on the rubber lower shaft. It is coaxial with the half shaft body and is suspended from the seismic isolation target member side with a predetermined interval, and a coil spring is slidably fitted to both shaft bodies. For vertical and ground vibrations and short-period ground motions with a short period, seismic isolation is generated based on the vibration, and in the case of slow large vibrations such as long-period ground motions, rubber shafts and coil springs 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 the sliding stretchability. The seismic isolation member according to claim 1, wherein the seismic vibration generating surface side is the ground and the seismic isolation target member side is a construction member such as a building.