JP3121118U - Seismic isolation rubber bearing device for structures - Google Patents

Abstract

An object of the present invention is to provide a seismic isolation rubber bearing device for a structure that can reduce the vertical rigidity and prevent the horizontal displacement from becoming excessively large, and can be spread and expanded at low cost.
A seismic isolation rubber bearing device (1) for a structure is provided between an upper structure (2) and a lower structure (3), and the lower structure (3) and the upper structure (2) are relatively in a vertical plane. And it is supported so that it can be displaced in a horizontal plane. A laminated rubber body 20 in which a plurality of reinforcing plates and rubber plates are laminated and integrated, and the lower structure 3 is attached to one attachment surface, and the other attachment of the laminated rubber body has a predetermined damping performance One mounting surface is connected to the surface and the upper structure 2 is attached to the other mounting surface, and the outer periphery of the laminated rubber body 20 fixed to the lower structure 3 The restraint body 32 is provided so that at least a part of the portion can be restrained and restrains the laminated rubber body 20 from being displaced in the horizontal direction.
[Selection] Figure 4

Description

  The present invention relates to a seismic isolation rubber bearing device for structures for supporting structures such as bridges and buildings. More particularly, the present invention relates to a seismic isolation rubber bearing device for a structure capable of improving the seismic isolation performance and contributing to the spread of the product at a low price.

  In the Great Hanshin-Awaji Earthquake (Hyogoken-Nanbu Earthquake), various structures and buildings were severely damaged. One of the buildings and structures includes bridges such as roads and railroads, and it is known that damage to the bridges was concentrated in the support section that supports the bridge girder. As the damaged bearing parts, many metal (steel) bearing devices were used. For this reason, it has been demanded that the Japanese archipelago, which is an earthquake archipelago, adopt a rubber bearing device that has not been damaged so much as one of the measures for earthquakes and major earthquakes that will occur in the future.

  A rubber bearing device using laminated rubber is a laminate of thin steel plates (reinforcing plates) and rubber alternately laminated (laminated rubber with built-in reinforcing plates), and has a large horizontal displacement characteristic and is generated during an earthquake. It is intended to absorb large horizontal relative displacement by the elasticity of rubber. The applicant also maintains a low vertical rigidity of the device without disturbing the rotation function, and a horizontal force that does not adversely affect the structure by increasing the horizontal rigidity by partially restraining the displacement in the horizontal direction. A distributed bearing device has been proposed (see, for example, Patent Document 1).

  Also, using lead plugs with rubber or using high damping rubber to increase the natural frequency of structures and buildings, and to increase the damping coefficient to reduce the acting seismic force. A so-called seismic isolation rubber bearing device has also been developed that reduces the load by preventing the resonance with the vibration. As an example, a seismic isolation rubber bearing device employing a lead plug-containing laminated rubber is known (see, for example, Patent Documents 2 and 3).

Furthermore, as another example, a seismic isolation rubber bearing device in which rubber itself has a high damping property is also known (see, for example, Patent Document 4). In addition, a seismic isolation rubber bearing structure is also known in which initial rigidity is easily set (see, for example, Patent Document 5).
JP 2004-011197 A JP 09-317822 A Japanese Patent Laid-Open No. 10-238161 JP 2000-097270 A JP 2003-106008 A

  However, conventional seismic isolation rubber bearing devices have a larger bearing area than metal (steel) bearing devices and satisfy the rotational performance of girders with the amount of strain in the vertical direction of the rubber. The thickness had to be increased to some extent. However, if the thickness of the seismic isolation rubber is increased, the horizontal rigidity is also lowered, and the horizontal displacement (movement amount) of the upper structure during an earthquake may be excessively increased. That is, it is possible to suppress severe vibrations of earthquakes, but it is not possible to suppress displacement that moves so as to shake slowly.

  For this reason, there has been a problem in that the upper structure may collide with other structures due to a large movement and adversely affect the upper structure or the like. However, the techniques of Patent Documents 1 to 5 described above do not solve such problems. Therefore, in the seismic isolation rubber bearing device adopting the seismic isolation rubber which is said to have a damping performance of 20% or more, the vertical rigidity remains the same as before in order to make full use of the performance of the seismic isolation rubber. There has been a demand for the development of a seismic isolation rubber bearing device that can prevent displacement from becoming excessively large due to a highly rigid seismic isolation bearing.

  On the other hand, the seismic isolation rubber bearing device is still expensive, and the cost burden is too large to be used as a bearing device for structures and buildings such as bridges and the like in the country. Therefore, it is eagerly desired that the seismic isolation rubber bearing device can be expanded at a low price.

The present invention has been made to solve the conventional problems based on the technical background and social background as described above, and achieves the following object.
The purpose of the present invention is to reduce the vertical rigidity and prevent the horizontal displacement from becoming excessively large so that the seismic isolation rubber can perform at its full potential. The object is to provide a seismic isolation rubber bearing device.

The present invention takes the following means to achieve the above-described object.
The seismic isolation rubber bearing device of the structure of the present invention 1 is provided between an upper structure and a lower structure, and the lower structure and the upper structure are relatively displaced in a vertical plane and a horizontal plane. A seismic isolation rubber bearing device that supports the laminated rubber body in which a plurality of reinforcing plates and rubber plates are laminated and integrated, and the lower structure or the upper structure is attached to one mounting surface; A plurality of reinforcing plates are laminated so as to have a predetermined damping performance, and one attachment surface is connected to the other attachment surface of the laminated rubber body, and the upper structure or The seismic isolation laminated rubber body to which the lower structure is attached, and the lower structure capable of restraining at least part of the outer peripheral portion or inner peripheral portion of the lower rubber structure or the laminated rubber body fixed to the structure. Or on the superstructure Is, the laminated rubber body is formed of a restraining member which restrains from being moved in the horizontal direction.

The seismic isolation rubber bearing device for the structure of the present invention 2 is the present invention 1,
The seismic isolation laminated rubber body is manufactured from a high damping rubber having a high damping characteristic.

The seismic isolation rubber bearing device of the structure of the present invention 3 is the present invention 1,
The seismic isolation laminated rubber body is characterized in that a lead plug is embedded and a seismic isolation performance is exhibited by a combination of the laminated rubber and the lead plug.

  As described above, the seismic isolation rubber bearing device of the structure of the present invention has a structure in which a general laminated rubber body and a seismic isolation laminated rubber body are combined and the outer peripheral portion of the laminated rubber body is restrained by a restraining body. This prevents the structure from being displaced excessively without impairing the seismic isolation performance by constraining a part of the horizontal displacement without lowering the rigidity in the vertical direction and hindering the rotation function. can do.

  Conventionally, in order to reduce the vertical rigidity and increase the horizontal rigidity, it has been necessary to make the shape excessively large. However, in the present invention, this is not necessary, so the economic effect can be increased. As a result, if the use of seismic isolation rubber bearing devices is increased, the economic effect is further increased by the mass production effect.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view of the seismic isolation rubber bearing device of the structure of the present invention, FIG. 2 is a cross-sectional view of FIG. 1 cut along the line AA, and FIG. 3 is a cross-sectional view of FIG. FIG. 4 is a sectional view in the direction of the bridge axis showing a state where the seismic force acts on the seismic isolation rubber bearing device of the present invention and the seismic isolation rubber bearing device is deformed.

  The seismic isolation rubber bearing device 1 according to this embodiment includes a laminated rubber body 20 containing a plurality of layers of reinforcing plates, and a seismic isolation laminated rubber body that is provided on the laminated rubber body 20 and is made of high damping rubber. 10, a lower rod 31 fixed to the lower surface of the laminated rubber body 20, and an upper rod 30 fixed to the upper surface of the seismic isolation laminated rubber body 10, the abutment 3 as a lower structure and the bridge girder as an upper structure Between the two. 3 and 4 are cross-sectional views cut in the bridge axis direction (longitudinal direction of the bridge girder) when the structure is a bridge (the upper structure is a steel bridge girder and the lower structure is a concrete abutment). . In this embodiment, the upper structure is a steel bridge girder and the lower structure is a concrete abutment. However, the upper structure and the lower structure are not limited to the bridge girder and the abutment. Needless to say.

  The seismic isolation laminated rubber body 10 is a first laminated rubber 11 in which rectangular high-damping rubber plates and rectangular reinforcing plates are alternately laminated over a plurality of layers and integrally vulcanized. The first laminated rubber 11 is preferably made of a high-damping rubber having a high damping performance as a material. That is, the first laminated rubber 11 includes, for example, one or more kinds of rubber selected from diene rubbers such as natural rubber and isoprene rubber, ethylene propylene rubber, butyl rubber and the like, and a compounding agent such as carbon black, silica, and resin. In addition, it is preferable to use a material called a high-attenuating rubber composed of a vulcanizing agent, an anti-aging agent and the like generally used in the rubber industry.

The material of the reinforcing plate is preferably steel, for example. The reinforcing plate includes a first thin steel plate 13, a first mounting plate 14, and a first thick steel plate 15. Here, the thickness of the high damping rubber plate is, for example, about 25 mm, the thickness of the first thin steel plate 13 is, for example, about 3.2 mm, and the thicknesses of the first mounting steel plate 14 and the first thick steel plate 15 are, for example, It is about 20-40 mm. The first laminated rubber 11 includes a first thick steel plate 15, a high damping rubber plate, a first thin steel plate 13, a high damping rubber plate, a first thin steel plate 13, a high damping rubber plate in order from the top. A damping rubber plate and a first mounting steel plate 14 are laminated and integrally vulcanized.
The first laminated rubber 11 of the seismic isolation laminated rubber body 10 is a highly damped rubber that is soft in the horizontal direction, so that the severe vibration of the earthquake is moderated, the vibration of the bridge girder 2 is lengthened, and after the earthquake has stopped, The restoring force of the high-damping rubber acts to return the bridge girder 2 to its original position.

  The laminated rubber body 20 is composed of a second laminated rubber 21 in which rectangular rubber plates and rectangular reinforcing plates are alternately laminated over a plurality of layers and integrally vulcanized. Here, the material of the rubber plate is, for example, a rubber elastic body, and the material of the reinforcing plate is, for example, steel. The reinforcing plate includes a second thin steel plate 23, a second mounting steel plate 24, and a second thick steel plate 25. Here, the thickness of the rubber plate is, for example, about 25 mm, the thickness of the second thin steel plate 23 is, for example, about 3.2 mm, and the thickness of the second mounting steel plate 24 and the second thick steel plate 25 is, for example, 20-40 mm. Degree. In this laminated rubber body 20, a second mounting steel plate 24, a rubber plate, a second thin steel plate 23, a rubber plate, a second thin steel plate 23, a rubber plate, a rubber plate, and a second thick steel plate 25 are laminated in order from the top. Are integrally vulcanized and molded.

  The laminated rubber body 20 preferably includes the second thin steel plate because the amount of compressive deformation is small, but the second mounting steel plate and the second thick steel plate not including the second thin steel plate are provided. It may be a thing. The first thick steel plate 15 of the seismic isolation laminated rubber body 10 is fixed to the upper collar 30 with an appropriate number of mounting bolts 30a. Further, the second thick steel plate 25 of the laminated rubber body 20 is fixed to the lower collar 31 with an appropriate number of mounting bolts 31a. Further, the first mounting steel plate 14 of the seismic isolation laminated rubber body 10 and the second mounting steel plate 24 of the laminated rubber body 20 include an appropriate number (for example, 12 in this embodiment) of bolts 16, nuts 17 and the like. It is fixed integrally with. The seismic isolation laminated rubber body 10 and the laminated rubber body 20 are integrated to constitute the seismic isolation rubber bearing device 1.

  Then, the lower rod 31 is fixed to the abutment 3 by an appropriate number of anchor bolts 3a, and the upper rod 30 is connected to the sole plate 2b fastened to the bridge girder 2 by an appropriate number of fastening bolts 2a via a shear key 2c. Thus, the seismic isolation rubber bearing device 1 is installed on the bridge. The seismic isolation laminated rubber body 10 and the laminated rubber body 20 may be bonded by welding, welding or the like, and the seismic isolation laminated rubber body 10 and the laminated rubber body 20 are integrally manufactured from the beginning. It may be what was done.

  In this embodiment, a stopper block (restraint body) 32 protrudes (starts up) from the lower collar 31 to a position facing the first mounting steel sheet 14 or the second mounting steel sheet 24, and the laminated rubber body 20 is horizontal. This is characterized in that the displacement in the direction is constrained. Here, stopper blocks 32 and 32 are provided before and after the lower rod 31 in the bridge axis direction. The stopper blocks 32 and 32 are provided so that they can be inserted into engaging recesses 14 a and 24 a formed in the first mounting steel plate 14 and the second mounting steel plate 24. That is, the laminated rubber body 20 is restrained by the stopper blocks 32 and 32 from moving or displacing in the direction of the bridge axis in the horizontal plane and the direction perpendicular to the bridge axis.

  Note that an engagement hole may be formed in the mounting steel plate, and an end portion of the stopper block may be inserted into the engagement hole to constrain the horizontal range of the laminated rubber body. In other words, the engagement portion between the mounting steel plate and the stopper block is of any shape as long as the mounting steel plate of the laminated rubber body and the stopper block can be engaged to restrain the horizontal displacement of the laminated rubber body. There may be. Furthermore, when the structure is a bridge and the upper structure is a bridge girder, the displacement of the laminated rubber body may be restricted only in the bridge axis direction.

  FIG. 4 is a cross-sectional view in the direction of the bridge axis showing a state in which seismic force acts on the seismic isolation rubber bearing device 1 and the seismic isolation rubber bearing device 1 is deformed. According to the seismic isolation rubber bearing device 1, in the vertical direction, the total thickness obtained by adding both the thickness of the laminated rubber body 20 and the thickness of the seismic isolation laminated rubber body 10 acts as an effective thickness. The rigidity is kept low. On the other hand, in the horizontal direction, the first mounting steel plate 14 or the second mounting steel plate 24 abuts against the stopper blocks 32 and 32, so that the laminated rubber body 20 is restrained from being displaced in the horizontal direction. Only 10 is displaced in the horizontal direction (see FIG. 4). That is, the horizontal rigidity of the seismic isolation rubber bearing device 1 can be increased, and even when the bridge girder 2 moves so as to shake due to an earthquake, it can be prevented from being excessively displaced in the horizontal direction.

  That is, the seismic isolation laminated rubber body 10 increases the natural frequency of the bridge girder 2 and the like, and increases the damping coefficient, thereby reducing the seismic force that acts when an earthquake occurs and preventing resonance with seismic waves. To slowly shake. Moreover, the seismic isolation rubber bearing device 1 prevents the horizontal displacement of the bridge girder 2 from being greatly displaced even if the bridge girder 2 is moved so as to swing slowly in spite of the reduced vertical rigidity so that it is within a predetermined range. Is regulated. In other words, the seismic isolation rubber support device 1 combines the general laminated rubber body 20 and the seismic isolation laminated rubber body 10, and has a structure in which the outer peripheral portion of the laminated rubber body 20 is restrained by the stopper block 32. The horizontal girder 2 (upper structure) shakes excessively and collides with other structures without impairing the seismic isolation performance without restricting the horizontal displacement without impairing the rotation function by lowering the rigidity of the bridge. To prevent such displacement.

[Other Embodiments]
Another embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a cross-sectional view of a seismic isolation rubber bearing device 1A showing another embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 3, and FIG. 6 shows a seismic isolation rubber bearing device 1A according to another embodiment. FIG. 5 is a cross-sectional view in the direction of the bridge axis showing a state in which seismic force acts and the seismic isolation rubber bearing device 1A is deformed, corresponding to FIG.
In the embodiment described above, the seismic isolation laminated rubber body 10 is described as using a high damping rubber having a high damping performance for the rubber itself. However, the seismic isolation laminated rubber of other embodiments is described. The body 110 has a lead plug 12 embedded in a laminated rubber. In the description of the other embodiments, the same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof is omitted.

  A seismic isolation rubber bearing device 1A according to another embodiment is provided with a laminated rubber body 20 containing a plurality of layers of reinforcing plates and an upper portion of the laminated rubber body 20, and a lead plug 12 is embedded in the laminated rubber. A seismic isolation laminated rubber body 110, a lower rod 31 fixed to the lower surface of the laminated rubber body 20, and an upper rod 30 fixed to the upper surface of the seismic isolation laminated rubber body 110, and the abutment 3 that is a lower structure and the upper portion It is installed between the bridge girder 2 which is a structure.

  The seismic isolation laminated rubber body 110 is obtained by embedding a plurality of (for example, four) lead plugs 12 in a predetermined position in the first laminated rubber 111. One lead plug may be embedded in laminated rubber. The seismic isolation laminated rubber body 110 is a first laminated rubber 111 in which rectangular rubber plates and rectangular reinforcing plates are alternately laminated over a plurality of layers and integrally vulcanized. Here, the material of the rubber plate is, for example, a rubber elastic body, and the material of the reinforcing plate is, for example, steel. The reinforcing plate includes a first thin steel plate 13, a first mounting steel plate 14, and a second thick steel plate 15. Here, the thickness of the rubber plate is, for example, about 25 mm, the thickness of the first thin steel plate 13 is, for example, about 3.2 mm, and the thickness of the first mounting steel plate 14 and the first thick steel plate 15 is, for example, 20-40 mm. Degree. The first laminated rubber 111 includes a first thick steel plate 15, a rubber plate, a first thin steel plate 13, a rubber plate, a first thin steel plate 13, a rubber plate, a rubber plate, and a first mounting steel plate 14 in order from the top. And is integrally vulcanized and molded.

  The lead plug 12 mainly functions as a damper and acts to suppress vibration by absorbing vibration energy in the shear direction. In other words, the lead plug 12 causes plastic deformation in accordance with the deformation of the first laminated rubber 111, absorbs the seismic energy, and quickly attenuates the vibration, thereby suppressing the deformation amount due to the earthquake. That is, the seismic isolation laminated rubber body 110 works in a coordinated manner with the action of the laminated rubber and the action of the lead plug 12, and immediately exhibits seismic isolation performance when an earthquake occurs (see FIG. 6).

  Even in the seismic isolation rubber bearing device 1A, the general laminated rubber body 20 and the seismic isolation laminated rubber body 110 are combined, and the outer peripheral portion of the laminated rubber body 20 is constrained by the stopper block 32, so that the rigidity in the vertical direction is increased. Without lowering the rotation function, the horizontal displacement is partly constrained, and the bridge girder 2 (superstructure) will shake excessively and collide with other structures without impairing the seismic isolation performance. This prevents the displacement.

The embodiment of the present invention has been described above, but the present invention is not limited to this embodiment. It goes without saying that changes can be made without departing from the purpose and spirit of the present invention.
For example, although the seismic isolation laminated rubber bodies 10 and 110 of the seismic isolation rubber bearing device are combined on the upper side and the laminated rubber body 20 on the lower side, the present invention is not limited to this. That is, the seismic isolation laminated rubber bodies 10 and 110 are combined on the lower side, the laminated rubber body 20 is combined on the upper side, the second thick steel plate on the laminated rubber body 20 side is connected to the bridge girder (upper structure) 2, and the seismic isolation laminated rubber body 10 is combined. , 110 side first thick steel plate may be fixed to the abutment (lower structure) 3. In that case, a stopper block (restraint body) may be provided on the upper collar 30 side.

  Furthermore, although the description has been given of the restraining body that restrains the outer peripheral portion of the laminated rubber body, the inner peripheral portion of the laminated rubber body may be restrained. For example, a rectangular internal hole is formed in the laminated rubber body, a rectangular stopper block (restraint) corresponding to the internal hole is projected from the lower collar (or upper collar), and the stopper block is inserted into the inner hole. It may be configured as described above.

FIG. 1 is a plan view of the seismic isolation rubber bearing device of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view of FIG. 1 taken along line BB. FIG. 4 is a cross-sectional view in the direction of the bridge axis showing a state where the seismic isolation rubber bearing device is deformed by the action of seismic force. FIG. 5 is a cross-sectional view of a seismic isolation rubber bearing device according to another embodiment of the present invention, and corresponds to FIG. FIG. 6 is a cross-sectional view in the direction of the bridge axis showing a state in which the seismic isolation rubber bearing device of another embodiment is deformed by the action of seismic force.

Explanation of symbols

1,1A ... Seismic isolation rubber bearing device 2 ... Bridge girder (superstructure)
3 ... Abutment (under structure)
3a ... anchor bolts 10, 110 ... seismic isolation laminated rubber bodies 11, 111 ... first laminated rubber 12 ... lead plug 13 ... first thin steel plate 14 ... first mounting steel plate 15 ... first thick steel plate 20 ... laminated rubber body 21 ... 2nd laminated rubber 23 ... 2nd thin steel plate 24 ... 2nd attachment steel plate 25 ... 2nd thick steel plate 30 ... Upper collar 31 ... Lower collar 32 ... Restraint body (stopper block)

Claims (3)

Provided between the upper structure (2) and the lower structure (3), the lower structure (3) and the upper structure (2) can be relatively displaced in a vertical plane and a horizontal plane. A seismic isolation rubber bearing device (1, 1A)
A laminated rubber body (20) in which a plurality of reinforcing plates and rubber plates are laminated and integrated, and the lower structure (3) or the upper structure (2) is attached to one attachment surface;
A plurality of reinforcing plates are built in and laminated so as to have a predetermined damping performance, one attachment surface is connected to the other attachment surface of the laminated rubber body, and the upper structure (2 ) Or the base-isolated laminated rubber body (10, 110) to which the lower structure (3) is attached,
The lower structure (3) or the lower structure (3) or the laminated structure (2) fixed to the lower structure (3) or the laminated rubber body (20), the lower structure (3) or A seismic isolation rubber bearing device for a structure comprising: a restraining body (32) provided on the upper structure (2) and restraining the horizontal displacement of the laminated rubber body (20). A seismic isolation rubber bearing device for a structure according to claim 1,
The seismic isolation laminated rubber body (10) is manufactured from a high damping rubber having a high damping characteristic as a material. A seismic isolation rubber bearing device for a structure according to claim 1,
The seismic isolation rubber body (110) is embedded in a lead plug (12) and exhibits seismic isolation performance by a combination of the laminated rubber and the lead plug. Bearing device.

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