JP2013113383A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit an attenuation function for vibration in both horizontal and vertical directions, to reduce facility costs, and to apply a base isolation device for a large-sized structure which is installed between an upper structure and a lower structure for attenuating vibration transferred from one of the upper and lower structures to the other.SOLUTION: A base isolation device includes a sliding bearing structure in which a sliding material 1 is fixed to an upper structure A and a slide plate 2 is fixed to a lower structure B. The slide plate 2 is formed of a plate which is energized to be curved in a recessed shape from the center to the sliding material 1 and to which elasticity is set to be flat with a load of the upper structure during no base isolating operation, and fixed while being supported by a supporting leg 4 partially only in the center.

Description

  The present invention belongs to a technical field related to a seismic isolation device that is installed between an upper structure and a lower structure and attenuates a vibration (vibration) transmitted from one of the upper structure and the lower structure to the other.

  As a seismic isolation device, a device having a sliding support structure is widely used. This seismic isolation device has a sliding member fixed to one of the upper structure and the lower structure and a sliding plate fixed to the other, and sliding the sliding member along the sliding plate allows the upper structure and lower structure to move. It attenuates the vibration transmitted from one side to the other.

  This seismic isolation device has a characteristic that it effectively exhibits a damping function for lateral vibrations but hardly exhibits a damping function for vertical vibrations. For this reason, there is a demand for the development of a technology that can effectively exhibit a damping function against longitudinal vibration in a seismic isolation device having a sliding support structure.

  2. Description of the Related Art Conventionally, for example, a technique described in Patent Document 1 is known as a technique aimed at effectively exhibiting a damping function even with respect to longitudinal vibration in a seismic isolation device having a sliding support structure.

  In Patent Document 1, a slide plate is fixed to an upper structure, a slip material is fixed to a lower structure via a bellows-shaped air spring, and a guide shaft that regulates the expansion / contraction direction of the air spring to the lower structure is linear. A seismic isolation device with a guide mechanism consisting of a bushing is described.

  The seismic isolation device according to Patent Document 1 exhibits a damping function for longitudinal vibrations by an air spring, and maintains a basic structure of a sliding support structure composed of a sliding material and a sliding plate to attenuate lateral vibrations. It is intended to prevent loss of function.

JP-A-10-169708

  In the seismic isolation device according to Patent Document 1, since an air spring that exhibits a damping function with respect to longitudinal vibration is required to be effectively operated, a guide mechanism is required to be installed, which complicates the structure and reduces the equipment cost. However, there is a problem that it cannot be applied to a large structure in which a large load is applied and a small mechanism is not suitable.

  The present invention has been made in view of such problems, can exhibit a damping function against both horizontal and vertical vibrations, has a low equipment cost and a large structure. It is an object to provide a seismic isolation device that can be applied to objects.

  In order to solve the above-described problems, the seismic isolation device according to the present invention employs means described in each of the claims.

  That is, in claim 1, in the seismic isolation device having the sliding support structure in which the sliding member is fixed to one of the upper structure and the lower structure and the sliding plate is fixed to the other, the sliding plate faces the sliding member. It is made of a plate material that is energized so as to bend in a concave shape from the center and is elastically set so that it becomes flat with the load of the upper structure during non-base-isolating operation, and is supported only partially by the support legs in the center. It is fixed.

  In this means, by providing elasticity to the sliding material constituting the sliding support structure, the sliding material itself exhibits a damping function against vertical vibration, and the guide mechanism of the seismic isolation device according to Patent Document 1 is unnecessary. .

  According to a second aspect of the present invention, in the seismic isolation device of the first aspect, the sliding plate is formed in a disc shape, and the sliding member is provided with a sliding surface that comes into contact with the sliding plate in a ring shape. To do.

  With this means, the sliding surface that is in contact with the sliding plate of the sliding material is formed in a ring shape, so that the sliding posture of the sliding material can be stabilized without excessively increasing sliding friction. It is possible to prevent foreign matter that hinders the sliding of the material from entering the inside of the sliding surface.

  According to a third aspect of the present invention, in the seismic isolation device according to the first or second aspect, the slip plate is provided on the periphery of the disc-shaped main body portion so as to protrude toward the slide material and to provide a slip material stopper for regulating the sliding area of the slide material. It is characterized by being.

  In this means, the slip plate is provided with a slip material stopper for restricting the sliding area, so that the slip material is prevented from detaching from the main body of the slide plate.

  Further, according to claim 4, in the seismic isolation device according to any one of claims 1 to 3, an elastic deformation region in a direction opposite to the slip material of the slip plate is provided on the upper structure or the lower structure portion to which the slip plate is fixed. A slip plate stopper for regulating is provided.

  In this means, a slip plate stopper for restricting the elastic deformation region is provided in the lower structure portion, thereby preventing the slip plate from being deformed more than necessary.

  The seismic isolation device according to the present invention provides elasticity to the sliding material constituting the sliding support structure, thereby causing the sliding material itself to exhibit a damping function with respect to longitudinal vibration, and guides the seismic isolation device according to Patent Document 1. Since the mechanism is not required, it is possible to exhibit a damping function against both horizontal and vertical vibrations, and there is an effect that the equipment cost is low and it can be applied to a large structure.

  Furthermore, as claimed in claim 2, the sliding surface of the sliding member that is in contact with the sliding plate is formed in a ring shape, so that the sliding posture of the sliding member can be stabilized without excessively increasing sliding friction. At the same time, since it is possible to prevent foreign matter that obstructs the slip of the slip material from entering the inside of the slip surface, the slip support structure has an effect of smoothly and surely attenuating the lateral vibration.

  Further, as claimed in claim 3, since the slip plate is provided with a slip material stopper for restricting the sliding area, the slip material is prevented from detaching from the main body portion of the slide plate, and therefore the vibration exceeding the seismic isolation limit. By this, there is an effect that the apparatus configuration does not easily collapse.

  Further, as claimed in claim 4, since a slip plate stopper for restricting the elastic deformation region is provided in the lower structure portion, the slip plate is prevented from being deformed more than necessary, so that the device configuration is caused by the vibration exceeding the seismic isolation limit. Has the effect of not easily collapsing.

It is a longitudinal cross-sectional view (including the principal part enlarged view) of the form for implementing the seismic isolation apparatus which concerns on this invention. It is the XX sectional view taken on the line of FIG. It is a figure which shows the seismic isolation operation | movement of FIG. It is a figure which shows the other seismic isolation operation | movement of FIG. It is a figure which shows other seismic isolation operation | movement of FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the seismic isolation apparatus which concerns on this invention is demonstrated based on drawing.

  In this form, what is installed near the foundation of the building is shown. That is, the column of the building is targeted as the upper structure A, and the foundation of the building is targeted as the lower structure B.

  As shown in FIG. 1, this embodiment includes a sliding support structure including a sliding member 1 fixed to the upper structure A and a sliding plate 2 fixed to the lower structure B.

  The sliding material 1 is fixed to the lower end portion of the upper structure A, and a ring-shaped sliding surface 12 is provided below the side wall surface 11 covering the outer peripheral surface of the lower end portion of the upper structure A (see FIG. 2). . The side wall surface 11 supports the sliding surface 12 from above and reinforces the lower end portion of the upper structure A. The sliding surface 12 is formed in a shape having a curved cross-sectional shape so that smooth sliding along the sliding plate 2 can be obtained. The non-slip surface 13 corresponding to the bottom surface surrounded by the slide surface 12 is formed in a shape that is curved upward and recessed, and supports the slide surface 12 from the side and reinforces the bottom surface portion of the upper structure A. Yes.

  The slide plate 2 is fixed to a support leg 4 fixed to a support base 3 fixed to the lower structure B, and is protruded toward the upper side (slip material 1 side) at the periphery of the disc-shaped main body 21. A material stopper 22 is provided. The main body 21 is formed in a disk shape having a diameter larger than that of the sliding surface 12 of the sliding material 1 and is supported by the support leg 4 only at the center so as to pass through a small space from the lower structure B (support base 3). Has been launched. The main body 21 is given elasticity and is urged so as to bend in a concave shape from the center toward the upper side (sliding material 1 side), and is flat with the load of the upper structure B during non-seismic isolation operation. The elasticity is set so as to be in the state of FIG. The slip material stopper 22 regulates the sliding area of the slide material 1, prevents the slip material 1 from detaching from the main body 21 of the slide plate 2, and the device configuration is caused by the vibration exceeding the seismic isolation limit. Do not collapse easily.

  For these sliding material 1 and sliding plate 2, a laminated structure is selected in which steel is the main material and the surface is a stainless material having corrosion resistance and wear resistance. In addition, between the sliding material 1 and the sliding plate 2, smoothness for smooth sliding of the sliding material 1 is ensured, but a certain degree of friction coefficient is secured so that the sliding material 1 does not slide due to minute vibration. Is done.

  Moreover, the support base 3 and the support leg 4 are formed using steel as a main material. The support base 3 is embedded and fixed in the lower structure B, and a slip plate stopper 5 is fixed to the periphery. The slip plate stopper 5 regulates the elastic deformation area below the slide plate 2 (in the direction opposite to the slide material 1), and prevents the slip plate 2 from being deformed more than necessary, exceeding the seismic isolation limit. The device configuration should not be easily collapsed by the vibration.

  In this mode, when the lower structure B vibrates due to an earthquake or the like, the sliding surface 12 of the sliding material 1 slides on the main body 21 of the sliding plate 2 as shown in FIG. 3 (sliding support structure). Thus, the damping function for lateral vibration is exhibited.

  In the sliding of the sliding surface 12 of the sliding material 1, since the sliding surface 12 is formed in a ring shape, the sliding posture of the sliding material 1 can be stabilized without excessively increasing the sliding friction, and the sliding It is possible to prevent the foreign matter that obstructs the sliding of the material 1 from entering the inside of the sliding surface 12. As a result, the damping function against the lateral vibration due to the sliding support structure is smoothly and reliably performed.

  Further, as shown in FIG. 4, the main body portion 21 of the sliding plate 2 pressed against the sliding surface 12 of the sliding member 1 by the ascending lower structure B is bent and deformed in a concave shape in the vertical direction ( Attenuation function against vibrations in the upward direction).

  Further, as shown in FIG. 5, the main body portion 21 of the sliding plate 2 that is lowered together by the lower structure B that is lowered is curved and deformed in a concave shape upward to maintain the pressure on the sliding surface 12 of the sliding material 1. Thus, the damping function for vertical (downward) vibration is exhibited.

  In addition, after the damping function with respect to the vibration in the horizontal direction and the vertical direction is exhibited, the original position (FIG. 1) is restored by the elasticity of the main body portion 21 of the sliding plate 2.

  Therefore, according to this form, although the guide mechanism of the seismic isolation apparatus which concerns on patent document 1 becomes unnecessary, it can exhibit a damping function with respect to the vibration of both a horizontal direction and a vertical direction. As a result, the structure is simplified, the equipment cost is reduced, and the structure can be applied to a large structure in which a large load is applied and a small mechanism is not suitable.

  As described above, a dustproof sheet can be stretched between the sliding member 1 and the sliding plate 2 in addition to the illustrated form.

  Furthermore, it is also possible to apply elasticity to the sliding material stopper 22 and the sliding plate stopper 5 of the sliding plate 2 so that the sliding material 1 and the sliding plate 2 can be quickly restored to their original positions.

  The seismic isolation device according to the present invention can be installed in a large-scale mechanical device other than a building and can also be strong against damping of mechanical vibration. Moreover, there is no problem even if it is applied to a small structure.

DESCRIPTION OF SYMBOLS 1 Sliding material 12 Sliding surface 2 Sliding plate 21 Main part 22 Slip material stopper 4 Support leg 5 Slip plate stopper A Upper structure B Lower structure

Claims (4)

  In the seismic isolation device having a sliding support structure in which a sliding member is fixed to one of the upper structure and the lower structure and a sliding plate is fixed to the other, the sliding plate curves concavely from the center toward the sliding member. It is formed of a plate material that is energized and elastically set so that it becomes flat with the load of the superstructure during non-seismic isolation operation, and is supported and fixed partially by the support legs only at the center Seismic isolation device.   2. The seismic isolation device according to claim 1, wherein the sliding plate is formed in a disc shape, and the sliding material is provided with a sliding surface that comes into contact with the sliding plate in a ring shape.   The seismic isolation device according to claim 1 or 2, wherein the sliding plate is provided with a stopper for the sliding material that protrudes toward the sliding material on the periphery of the disc-shaped main body portion and regulates the sliding area of the sliding material. Seismic isolation device.   The seismic isolation device according to any one of claims 1 to 3, wherein a slip plate stopper for restricting an elastic deformation region in a direction opposite to the slip material of the slip plate is provided on the upper structure or the lower structure portion to which the slide plate is fixed. Seismic isolation device characterized by being provided.

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