JP6420991B2 - Seismic isolation device - Google Patents

Description

The present invention, in mainly to base isolation structures Slender ratio is higher seismic isolation structures and Shear Walls, those related to immune ShinSo location of pulling force during earthquake Ru is installed in locations exposed to.

A high-rise or tower-shaped ratio (height / width) seismic isolation structure has a high center of gravity of the building, a tipping moment is generated during an earthquake, and excessive pulling out in the axial direction of the seismic isolation device installed at the end of the building Power is likely to be generated. Moreover, in a base-isolated structure with a multi-layer seismic wall, an excessive pulling force tends to be generated in the axial direction of the seismic isolation device installed immediately below the multi-layer seismic wall. When a pulling force exceeding the building load that is supported vertically is generated, a pulling force acts on the seismic isolation device.
Laminated rubber is strong against compressive load and supports large compressive load and can be displaced large with small rigidity in the horizontal direction, but it is weak against tensile load, so if an excessive tensile load is applied, the seismic isolation device As a result, the characteristic cannot be exhibited, and in the worst case, it may break. As countermeasures, (1) design so that the tensile load does not act, (2) use a seismic isolation device that can resist even if the tensile load acts, or (3) prevent the tensile load from acting on the laminated rubber. Three types are possible. Although the method (1) is generally adopted, the measure (1) may not be taken due to the shape of the building. Therefore, the methods (2) and (3) will be adopted, but the typical prior art of (2) is only an apparatus using a linear guide. There are several techniques of (3) and are known (for example, Patent Document 1: Japanese Patent Laid-Open No. 2006-226387, Patent Document 2: Japanese Patent Laid-Open No. 11-153191, Patent Document 3: Japanese Patent Laid-Open No. 2003-194146, Patent Document 4). : Patent 4330171). The prior art (3) will be described a little below.

In Patent Document 1, a winged steel plate is attached to the periphery of the laminated rubber lower flange plate between the lower structure, and the tensile strength is exerted on the laminated rubber by utilizing the feature that the in-plane rigidity of the steel plate is large and the out-of-plane rigidity is small. When acting, the winged steel plate undergoes out-of-plane deformation, and the laminated rubber is lifted away from the lower structure, so that a tensile force does not act on the laminated rubber.
Patent Documents 2 to 4 are all devised as an anchor bolt that fixes the laminated rubber lower flange plate to the lower structure. An elastic body is installed between the anchor bolt and the flange plate, and a tensile force acts on the laminated rubber. In this case, the elastic body is deformed, and the laminated rubber is lifted away from the lower structure so that a tensile force does not act on the laminated rubber. Patent Document 2 uses a rubber sheet as an elastic body, Patent Document 3 uses a disc spring as an elastic body, and Patent Document 4 uses a ring-shaped rubber or the like as an elastic body.

JP 2006-226387A JP-A-11-153191 JP 2003-194146 A Patent 4330171

As countermeasures against the occurrence of pulling force due to the shape of the building and other reasons, a laminated rubber type seismic isolation device adopts a method with a large rubber cross-sectional area or a seismic isolation device that can resist pulling. Although the method of doing it can be considered, cost will become high in any case.
There are some conventional techniques in which a laminated rubber is levitated from the lower structure in order to cope with pulling out with a laminated rubber type seismic isolation device.
In Patent Document 1, a large space is required around the laminated rubber, the steel plate must be fixed with a large amount of anchor bolts, and the construction is difficult. The steel plate requires durability measures such as rust. Is mentioned as a drawback.
Since Patent Document 2 only includes a rubber sheet, the floating amount of the laminated rubber is small. When the pulling force is increased, the rubber sheet may be compressed and deformed and may be damaged.

In Patent Document 3, the jig is larger than the anchor bolt and uses a disc spring, so it is even larger. Durability measures such as rust are necessary. Pre-compression management of the disc spring is necessary at the time of installation. There are disadvantages.
Patent Document 4 has drawbacks such that the jig is larger than the anchor bolt, the anchor bolt and the laminated rubber lower flange rate have a gap in the horizontal direction, and a mechanism for transmitting shear force is required separately.
An object of the present invention, a simple structure, without large space required, installation is simple, shear force to the laminated rubber are but tensile force transmission is to provide a seismic ShinSo location as little as possible transfer .

In order to achieve the above object, the present invention provides a seismic isolation laminated rubber, an upper flange plate provided on an upper part of the seismic isolation laminating rubber, and attached to an upper structure, and the seismic isolation laminating rubber. A seismic isolation device including a lower flange plate provided at a lower portion and attached to a lower structure via an anchor bolt, and an inner steel pipe and a thin cylindrical rubber sheet on an outer peripheral surface of the inner steel pipe And a thin steel pipe are alternately laminated on the radially outer side of the inner steel pipe, and a cylindrical laminated rubber, and an outer steel pipe attached to the outer peripheral surface of the cylindrical laminated rubber, the inner steel pipe The inner space is provided with a bolt mounting laminated rubber which is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted, and the flange plate is connected to the structure via the anchor bolt inserted into the bolt insertion hole. In In the attached state, the outer steel pipe is coupled to the flange plate so that the flange plate is integrally displaced in a direction away from the structure, and the inner steel pipe is connected to the anchor bolt with respect to the flange plate. The cylindrical laminated rubber is coupled so as not to be displaceable in a direction away from the structure, and the cylindrical laminated rubber is in a state in which the cylindrical laminated rubber can be shear-deformed in a vertical direction. regulating means provided et al is, in a state in which the flange plate through an insertion has been the anchor bolt into the bolt insertion hole is attached to said structure, the tubular laminated rubber, the seismic isolation laminate rubber A load is applied in advance in a direction opposite to the direction of pulling in the vertical direction .

In addition, the present invention is provided in the seismic isolation laminated rubber, the upper flange plate provided on the upper part of the seismic isolation rubber and attached to the upper structure, and the lower part of the seismic isolation rubber. A seismic isolation device comprising a lower flange plate attached to a lower structure via an anchor bolt, wherein the inner steel pipe, and a thin cylindrical rubber sheet and a thin steel pipe on the outer peripheral surface of the inner steel pipe A cylindrical laminated rubber that is alternately laminated on the radially outer side of the inner steel pipe, and an outer steel pipe attached to the outer peripheral surface of the cylindrical laminated rubber, and a space inside the inner steel pipe Is provided with a bolt mounting laminated rubber which is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted, and the flange plate is attached to the structure through the anchor bolt inserted into the bolt insertion hole. In the state The outer steel pipe is coupled to the flange plate so that the flange plate is integrally displaced with respect to a direction away from the structure, and the inner steel pipe is in a direction in which the flange plate is separated from the structure with respect to the anchor bolt. displacement incapable of being coupled to, the tubular laminated rubber has become a vertically permit shearing deformation state, restricting means for restricting the upper limit of the vertical deformation of the tubular laminated rubber Re et provided The bottom surface of the head of the anchor bolt is formed so as to be able to abut on the end surface of the outer steel pipe on the side away from the structure, and the inner side of the anchor bolt is positioned near the head. A contact portion that has an outer diameter that is less than or equal to the outer diameter of the steel pipe and that can contact the inner steel pipe is provided, and a bolt insertion hole is formed in the flange plate. The housing that can accommodate the inner steel pipe and the cylindrical laminated rubber when the flange plate is displaced in the vertical direction in a direction away from the structure together with the outer steel pipe at the location of the bolt insertion hole on the left side. In the state where the recess is provided and the flange plate is attached to the structure via the anchor bolt inserted through the bolt insertion hole, the contact portion and the inner steel tube are in contact with each other, and the outer steel tube The end face in the axial direction on the structure side is in contact with the position of the lower flange plate around the receiving recess, and the end face in the axial direction on the side away from the structure of the outer steel pipe is the bottom surface of the head of the anchor bolt It is located in the place away from .
In addition, the present invention is provided in the seismic isolation laminated rubber, the upper flange plate provided on the upper part of the seismic isolation rubber and attached to the upper structure, and the lower part of the seismic isolation rubber. A seismic isolation device comprising a lower flange plate attached to a lower structure via an anchor bolt, wherein the inner steel pipe, and a thin cylindrical rubber sheet and a thin steel pipe on the outer peripheral surface of the inner steel pipe A cylindrical laminated rubber that is alternately laminated on the radially outer side of the inner steel pipe, and an outer steel pipe attached to the outer peripheral surface of the cylindrical laminated rubber, and a space inside the inner steel pipe Is provided with a bolt mounting laminated rubber which is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted, and the flange plate is attached to the structure through the anchor bolt inserted into the bolt insertion hole. In the state The outer steel pipe is coupled to the flange plate so that the flange plate is integrally displaced with respect to a direction away from the structure, and the inner steel pipe is in a direction in which the flange plate is separated from the structure with respect to the anchor bolt. displacement incapable of being coupled to, the tubular laminated rubber has become a vertically permit shearing deformation state, restricting means for restricting the upper limit of the vertical deformation of the tubular laminated rubber Re et provided The bottom surface of the head of the anchor bolt has an outer diameter that is less than or equal to the outer diameter of the inner steel pipe, and is formed so as to be able to contact one end face in the axial direction of the inner steel pipe. In the direction where the flange plate is separated from the structure together with the outer steel pipe, the lead is inserted into the bolt insertion hole on the side away from the structure. The inner steel pipe and the cylindrical laminated rubber can be accommodated when displaced in the direction, and an accommodating recess having a bottom surface capable of contacting the other end face in the axial direction of the inner steel pipe is provided, and the bolt insertion With the flange plate attached to the structure through the anchor bolt inserted through the hole, the lower surface of the head of the anchor bolt and one end surface in the axial direction of the inner steel pipe abut and One end surface in the axial direction of the outer steel pipe is in contact with the lower flange plate, and the inner steel pipe and the cylindrical laminated rubber are in a vertical direction at a place outside the housing recess in a direction in which the flange plate is separated from the structure. It is located .

According to the present invention, when an axial tensile force acts on the seismic isolation laminated rubber, the cylindrical laminated rubber shears in the vertical direction, and the seismic isolation device rises from the lower structure, and the seismic isolation laminated rubber Tensile deformation can be kept small. Therefore, it is easy to construct without securing any space, which is advantageous in preventing breakage and damage of the seismic isolation laminated rubber.
Further , according to the present invention, the number of parts can be reduced and the construction can be simplified, which is advantageous in reducing the size of the seismic isolation device.
Further , according to the present invention, the vertical shear deformation of the cylindrical laminated rubber can be set within a range in which the characteristics of the cylindrical laminated rubber do not change, which is advantageous in ensuring the durability of the cylindrical laminated rubber. It becomes.
Further , according to the present invention, when an axial tensile force acts on the seismic isolation laminated rubber, the cylindrical laminated rubber is shear-deformed in the vertical direction, and the seismic isolation device is lifted from the lower structure, and the seismic isolation laminate The tensile deformation of rubber can be kept small. Therefore, it is possible to easily install without securing any space, the laminated rubber for bolt mounting is not damaged, the tensile load acting on the laminated rubber for seismic isolation can be reduced, the fracture of the laminated rubber for seismic isolation, This is advantageous in preventing damage.
Further , according to the present invention, the number of parts can be reduced and the construction can be simplified, which is advantageous in reducing the size of the seismic isolation device.
In addition, according to the present invention, by attaching the laminated rubber for bolts to the lower flange plate in advance, the seismic isolation device can be installed in the same construction procedure as before, simplifying the construction, making the seismic isolation device compact. This is advantageous in achieving this.
Moreover, according to this invention, the drawing force which a seismic isolation apparatus floats can be arbitrarily set by setting the value of the load applied beforehand to the said cylindrical laminated rubber suitably.

Further , according to the present invention, there is an advantage that it is not necessary to thread the outer peripheral portion of the outer steel pipe and the lower flange plate, and the processing and installation are easy.
In addition, according to the present invention, the contact portion can be easily obtained using the anchor bolt and the nut.
Further , according to the present invention, the restricting means can be easily obtained using the anchor bolt and the outer steel pipe.
Moreover, according to this invention, it is advantageous when preventing the fracture | rupture and damage of the laminated rubber for seismic isolation used for a seismic isolation apparatus.
Moreover, according to this invention, the handleability and storage property of the laminated rubber for bolt attachment can be improved.

It is explanatory drawing of 1st Embodiment, (A) shows the installation state of a seismic isolation apparatus, (B) is the state which tensile force acted on the laminated rubber for seismic isolation, and the seismic isolation apparatus lifted from the lower structure Is shown. (A) is a front view of an anchor bolt, (B) is a sectional front view of a laminated rubber for bolt attachment, and (C) is a plan view of the same. It is explanatory drawing of 2nd Embodiment. It is explanatory drawing of 3rd Embodiment, (A) shows the installation state of a seismic isolation apparatus, (B) is the state which tensile force acted on the laminated rubber for seismic isolation, and the seismic isolation apparatus lifted from the lower structure Is shown. It is explanatory drawing of 4th Embodiment, (A) shows the installation state of a seismic isolation apparatus, (B) is the state which tensile force acted on the laminated rubber for seismic isolation, and the seismic isolation apparatus lifted from the lower structure Is shown. It is explanatory drawing of 5th Embodiment, (A) shows the installation state of a seismic isolation apparatus, (B) is the state which tensile force acted on the laminated rubber for seismic isolation, and the seismic isolation apparatus lifted from the lower structure Is shown. It is a related figure of the tensile load which acts on the laminated rubber for seismic isolation in 1st Embodiment, and the vertical direction displacement of a seismic isolation apparatus. It is a related figure of the tensile load which acts on the laminated rubber for seismic isolation in 3rd Embodiment, and the vertical direction displacement of a seismic isolation apparatus. (A), (B) is explanatory drawing of embodiment by which an inner side steel pipe was abbreviate | omitted and the cylindrical laminated rubber was integrated with the anchor bolt. (A), (B) is explanatory drawing of embodiment by which an outer side steel pipe was abbreviate | omitted and the cylindrical laminated rubber was integrated with the flange plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
With reference to FIG. 1 and FIG. 2, first, from the first embodiment, the seismic isolation device 10 is provided between an upper structure (not shown) and a lower structure 12, and the lower structure The upper structure is supported by seismic isolation.
Here, the lower structure 12 is, for example, a foundation or a building, and the upper structure is a building, a column, a floor, or the like, and the seismic isolation device 10 is formed of such an upper structure and the lower structure 12. A plurality are provided in between.
The seismic isolation device 10 includes an isolation rubber 14, an upper flange plate (not shown) joined to the upper part of the isolation rubber 14, and a lower flange plate joined to the lower part of the isolation rubber 14. 16, a laminated rubber 20 for bolt attachment provided on the lower flange plate 16, and a regulating means 22.

The seismic isolation laminated rubber 14 includes a plurality of rubber sheets 1402 and steel plates 1404 that are alternately overlapped and joined, and a lead plug that absorbs vibration energy is inserted or not inserted therein. The present invention applies to both.
The upper flange plate attaches the upper part of the seismic isolation laminated rubber 14 to the upper structure via anchor bolts, and the lower flange plate 16 lowers the lower part of the seismic isolation laminated rubber 14 via anchor bolts 24. It is attached to the structure 12.
The upper flange plate and the lower flange plate 16 are formed with a larger cross section than the seismic isolation laminated rubber 14, and the centers of the upper flange plate and the lower flange plate 16 coincide with the axis of the seismic isolation laminated rubber 14. Bolt insertion holes 26 through which the anchor bolts 24 are inserted are formed at a plurality of locations spaced in the circumferential direction of the plate.

As shown in FIGS. 2B and 2C, the bolt-attached laminated rubber 20 includes an inner steel pipe 30, a cylindrical laminated rubber 32, and an outer steel pipe 34.
A space inside the inner steel pipe 30 is a bolt insertion hole 26 through which the shaft portion of the anchor bolt 24 is inserted.
In the cylindrical laminated rubber 32, a thin cylindrical rubber sheet 3202 and a thin steel pipe 3204 are alternately overlapped on the outer peripheral surface of the inner steel pipe 30 and coaxially overlapped with the inner steel pipe 30 and radially outward of the inner steel pipe 30. Configured.
The outer peripheral surface of the outer steel pipe 34 is attached to the outer peripheral surface of the cylindrical laminated rubber 32, and a male screw 3402 is formed on the outer peripheral surface of the outer steel pipe 34.
The inner steel pipe 30, the cylindrical laminated rubber 32, and the outer steel pipe 34 are coaxially positioned, and the lengths of the inner steel pipe 30, the cylindrical laminated rubber 32, and the outer steel pipe 34 along the axial direction of the bolt insertion hole 26 are the same dimensions. The end surfaces of the inner steel pipe 30, the cylindrical laminated rubber 32, and the outer steel pipe 34 that are formed at both ends in the axial direction are located on the same plane. By configuring the laminated rubber 20 for bolt attachment in this way, handling and storage are improved.
Also, the length of the laminated rubber 20 for bolt attachment along the axial direction of the bolt insertion hole 26 is formed with the same dimension as the thickness of the lower flange plate 16, and the laminated rubber 20 for bolt attachment is formed in the lower flange as will be described later. When attached to the plate 16, both end faces in the axial direction of the bolt-attached laminated rubber 20 are located on the same plane as the upper and lower surfaces of the lower flange plate 16, so that the seismic isolation device 10 can be handled and stored. Improvements are being made.

The bolt-attached laminated rubber 20 has a disk shape and is laminated with a rubber 3202 and a steel plate (steel pipe) 3204 in the radial direction, so that the rigidity in the axial direction (out-of-plane direction) is small and the radial direction (in-plane direction). ) Can be displaced easily and without friction in the axial direction.
The characteristics (rigidity, strength) of the laminated rubber 20 for bolt attachment can be adjusted by the rubber material, the rubber shape (thickness per layer, cross-sectional area), the thickness of the steel pipe, the number of laminated layers, and the like.

The bolt-attached laminated rubber 20 is attached to the lower flange plate 16 by the male screw 3402 being screwed into the female screw 1602 of the lower flange plate 16. That is, the outer steel pipe 34 is coupled to the lower flange plate 16 so that the lower flange plate 16 is integrally displaced with respect to the direction away from the lower structure 12.
In this state where the bolt-attached laminated rubber 20 is attached to the lower flange plate 16, the axial direction of the bolt-attached laminated rubber 20 is the vertical direction.
In the present embodiment, the bolt-attached laminated rubber 20 is attached to the lower flange plate 16 in advance by screw connection, thereby simplifying the construction of the seismic isolation device 10.

As shown in FIGS. 1 and 2A, the head portion 2402 of the anchor bolt 24 is formed with a size capable of contacting the outer steel pipe 34 when the outer steel pipe 34 is displaced upward. In the present embodiment, the restricting means 22 that restricts the upper limit of the amount of deformation of the cylindrical laminated rubber 32 upward is constituted by the head 2402 of the anchor bolt 24 and the outer steel pipe 34. The restricting means 22 may be configured by the head 2402 of the anchor bolt 24 and the lower flange plate 16, or provided on the mounting plate 36 on the lower structure 12 and abutting against the lower flange plate 16. Various configurations such as a possible L-shaped stopper and the lower flange plate 16 are conceivable, but when the restricting means 22 is configured using the head 2402 of the anchor bolt 24, the outer steel pipe 34 and the lower flange plate 16, This is advantageous in reducing the number of parts and making the seismic isolation device 10 compact.
An abutting portion 2406 that has an outer diameter that is equal to or smaller than the outer diameter of the inner steel pipe 30 and that can abut on the upper end surface of the inner steel pipe 30 is provided at the shaft portion 2404 near the head portion 2402 of the anchor bolt 24. Yes.
Specifically, the anchor bolt 24 includes a head portion 2402, a shaft portion 2404 projecting from the head portion 2402, a male screw portion 2408 in which a male screw is formed at the front portion of the shaft portion 2404, and a portion immediately below the head portion 2402. A large diameter portion having an outer diameter larger than the outer diameter of the shaft portion 2404 and less than or equal to the outer diameter of the inner steel pipe 30 is provided at the position of the shaft portion 2404, and this large diameter portion constitutes the contact portion 2406. .

The seismic isolation device 10 is installed by attaching the upper flange plate to the upper structure via anchor bolts and attaching the lower flange plate 16 to the lower structure 12 via anchor bolts 24. Specifically, the lower flange plate 16 is placed on the attachment plate 36 of the lower structure 12, and the anchor bolt inserted through the bolt insertion hole 26 of the laminated rubber 20 for bolt attachment and the bolt insertion hole 3602 of the attachment plate 36. The male screw portion 2408 of 24 is screwed into the female screw of the cap nut 38 embedded and fixed in the lower structure 12, and the lower flange plate 16 is fastened to the lower structure 12 by the anchor bolt 24.
With the seismic isolation device 10 installed in this manner, the inner steel pipe 30 is sandwiched between the contact portion 2406 and the mounting plate 36, and the inner steel pipe 30 has the lower flange plate 16 as the lower structure with respect to the anchor bolt 24. It is coupled so that it cannot be displaced in the direction away from 12. In other words, since the anchor bolt 24 is screwed into the lower structure 12 and cannot move in the vertical direction, the inner steel pipe 30 is coupled so as not to move in the vertical direction.
Further, the outer steel pipe 34 is coupled to the lower flange plate 16 so as not to move downward. In other words, when the lower flange plate 16 is displaced upward, the outer steel pipe 34 is coupled so as to be displaced upward together with the lower flange plate 16.
Further, the cylindrical laminated rubber 32 is in a state capable of shearing deformation in the axial direction. In other words, the cylindrical laminated rubber 32 is in a state in which when the lower flange plate 16 is displaced upward, the outer steel pipe 34 is displaced upward integrally with the lower flange plate 16 and can be shear-deformed upward.

According to such a first embodiment, when an axial tensile force is applied to the seismic isolation laminated rubber 14, the cylindrical laminated rubber 32 is mainly axial as shown by a straight line A in FIG. 7. The seismic isolation device 10 is lifted from the lower structure 12 and the tensile deformation of the seismic isolation laminated rubber 14 can be kept small.
Therefore, even if a pulling force is applied to the seismic isolation laminated rubber 14, only the cylindrical laminated rubber 32 undergoes shear deformation, so that the performance of the seismic isolation laminated rubber 14 is higher than that of a normal seismic isolation device 10 that does not support extraction. Degradation is unlikely to occur.
Further, since the cylindrical laminated rubber 32 is installed so that the axial direction is vertical, the cylindrical laminated rubber 32 is hardly deformed when a shearing force is applied to the seismic isolation laminated rubber 14 in the horizontal direction. The position of the seismic isolation laminated rubber 14 can be maintained, and a shearing force can be transmitted to the lower structure 12.

Further, the head 2402 of the anchor bolt 24 is formed with a size that can contact the lower flange plate 16 (or the outer steel pipe 34), that is, a restriction that restricts the upper limit of the amount of deformation of the cylindrical laminated rubber 32 upward. Since the means 22 is provided, an increase in the axial shear deformation of the cylindrical laminated rubber 32 can be prevented.
The upper limit of the amount of deformation upward of the cylindrical laminated rubber 32, that is, the gap between the lower surface of the head 2402 of the anchor bolt 24 and the lower flange plate 16 (or the outer steel pipe 34) is used for seismic isolation by pulling out during an earthquake. It is set so as to be within the range in which the characteristics of the cylindrical laminated rubber 32 do not change, for example, about 100% of the shear deformation of the rubber (for example, in the range of approximately 20 to 30 mm).
In FIG. 7, a point B indicates a state in which the lower flange plate 16 is lifted and the lower surface of the head 2402 of the anchor bolt 24 is in contact with the lower flange plate 16 (or the outer steel pipe 34). FIG. 2 shows a state where the seismic isolation laminated rubber 14 is pulled and deformed. A dotted line D indicates the displacement of the base isolation rubber of the conventional base isolation device 10 that does not have the cylindrical laminated rubber 32, and an imaginary line E causes a void or the like to occur in the base isolation rubber to be damaged. The tensile load at the time is shown.

  Therefore, according to the first embodiment, the tensile load acting on the seismic isolation laminated rubber 14 can be easily performed without securing any space, and the laminated rubber 20 for bolt mounting is not damaged. This is advantageous in preventing breakage and damage of the seismic isolation laminated rubber 14.

  More specifically, the horizontal shearing force acting on the seismic isolation laminated rubber 14 is transmitted from the lower flange plate 16 to the lower structure 12 via the cylindrical laminated rubber 32 and the anchor bolt 24. The anchor bolt 24 is designed with respect to the acting shear force and additional bending, but in the case of this apparatus, the pulling-out force acts on the seismic isolation laminated rubber 14 to lift the seismic isolation laminated rubber 14 and the lower flange plate 16. However, since the vertical position of the shearing force acting on the anchor bolt 24 does not change and the additional bending does not increase, the design of the anchor bolt 24 becomes easy and the increase in diameter can be prevented.

Since the cylindrical laminated rubber 32 is simply integrated into the lower flange plate 16 by screwing in advance, the installation work of the seismic isolation device 10 can be added simply by tightening with the anchor bolt 24 as in the case of a normal seismic isolation device. There is no work, and the work is simple.
Since the seismic isolation device 10 of the present embodiment has a simple structure, an increase in the size of the lower flange plate 16 and the attachment plate 36 of the lower structure 12 can be suppressed.

Next, a second embodiment will be described with reference to FIG.
In the following description of the embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and different points are mainly described.
The second embodiment is different from the first embodiment in the configuration of the contact portion 2406.
That is, the anchor bolt 24 includes a head portion 2402, a shaft portion 2404 projecting from the head portion 2402, a male screw portion 2408 in which a male screw is formed at the front portion of the shaft portion 2404, and a shaft portion immediately below the head portion 2402. A second male screw portion 2410 having a male screw formed at a position 2404;
The abutting portion 2406 is constituted by a nut N screwed to the second male screw portion.
According to the second embodiment as described above, the abutting portion 2406 can be easily configured using commercially available bolts and nuts, which is advantageous for cost reduction.

Next, a third embodiment will be described with reference to FIG.
The third embodiment is different from the first embodiment in that a load is applied to the cylindrical laminated rubber 32 in the installed state of the seismic isolation device 10 in advance.
That is, the lengths of the inner steel pipe 30, the cylindrical laminated rubber 32, and the outer steel pipe 34 along the axial direction of the bolt insertion hole 26 are formed with the same dimensions that are smaller than the thickness of the lower flange plate 16.
With the lower flange plate 16 attached to the lower structure 12 via the anchor bolts 24 inserted into the bolt insertion holes 26 and the seismic isolation device 10 installed, the lower surface of the inner steel pipe 30 is connected to the lower flange plate 16. The upper surface of the outer steel pipe 34 is positioned on the same plane as the upper surface of the lower flange plate 16. That is, with the seismic isolation device 10 installed, a shear load is applied to the cylindrical laminated rubber 32 in advance, and the cylindrical laminated rubber 32 is preliminarily sheared so that the outer peripheral portion is positioned above the inner peripheral portion. As a result, the lower flange plate 16 is pressed against the lower structure 12, and the seismic isolation device 10 does not float in a state where the tensile force is equal to or less than this load.

In the third embodiment, as shown in FIG. 8, when an axial tensile force acts on the seismic isolation laminated rubber 14, as shown by a point A in FIG. The seismic isolation device 10 does not float from the lower structure 12 until the shear load applied to the rubber 32 is reached. Then, as indicated by the straight line B, the cylindrical laminated rubber 32 is further shear-deformed from the initial state from the time when the tensile force exceeds the shear load previously applied to the cylindrical laminated rubber 32, and the seismic isolation device 10. Can be lifted from the lower structure 12 and the tensile deformation of the seismic isolation laminated rubber 14 can be kept small.
Further, in FIG. 8, a point C indicates a state in which the lower flange plate 16 is lifted and the lower surface of the head 2402 of the anchor bolt 24 and the lower flange plate 16 are in contact with each other. A state in which the laminated rubber 14 is pulled and deformed is shown, and a dotted line D and an imaginary line E are the same as those in FIG.
Therefore, according to the third embodiment, the same effects as those of the first embodiment can be obtained, and there is an advantage that the pulling force at which the seismic isolation device 10 floats can be arbitrarily set.

Next, a fourth embodiment will be described with reference to FIG.
The fourth embodiment is provided with an accommodation recess 40 in which the inner steel pipe 30 and the cylindrical laminated rubber 32 are accommodated when the cylindrical laminated rubber 32 undergoes shear deformation on the upper surface of the lower flange plate 16. And the point by which the control means 22 is comprised by the lower surface of the head 2402 of the anchor bolt 24, and the outer side steel pipe 34 differs from 1st Embodiment.
That is, the lower surface of the head 2402 of the anchor bolt 24 is formed so as to be able to contact the upper surface of the outer steel pipe 34, and the restricting means 22 is configured by the lower surface of the head 2402 of the anchor bolt 24 and the outer steel pipe 34. .
Further, a contact portion 2406 that has an outer diameter that is equal to or smaller than the outer diameter of the inner steel pipe 30 and that can contact the upper surface of the inner steel pipe 30 is provided at the shaft portion 2404 near the head portion 2402 of the anchor bolt 24. ing.
Bolt insertion holes 1604 are formed in the lower flange plate 16, and the inner steel pipe 30 and the cylindrical laminated rubber 32 are accommodated when the outer steel pipe 34 is displaced upward with respect to the inner steel pipe 30 at the upper part of the bolt insertion hole 1604. An accommodation recess 40 is provided to enable the above.

With the lower flange plate 16 fastened to the lower structure 12 via the anchor bolts 24 inserted into the bolt insertion holes 26, 1604, 3602, the lower surface of the contact portion 2406 contacts the upper surface of the inner steel pipe 30, The lower surface of the outer steel pipe 34 is in contact with the upper surface of the lower flange plate 16 around the housing recess 40. That is, the outer steel pipe 34 is coupled to the lower flange plate 16 so that the lower flange plate 16 is integrally displaced with respect to the direction away from the lower structure 12. Further, the inner steel pipe 30 is coupled to the anchor bolt 24 so that the lower flange plate 16 cannot be displaced in the direction away from the lower structure 12.
According to the fourth embodiment, when an axial tensile force is applied to the seismic isolation laminated rubber 14, the cylindrical laminated rubber 32 undergoes shear deformation mainly in the axial direction, and the seismic isolation device 10 is Since it floats up from the lower structure 12 and the tensile deformation of the seismic isolation laminated rubber 14 can be suppressed to a small level, the same effects as those of the first embodiment can be obtained. Further, in this embodiment, there is an advantage that the outer peripheral portion of the outer steel pipe 34 and the lower flange plate 16 do not need to be threaded, and the processing and installation are easy.

Next, a fifth embodiment will be described with reference to FIG.
The fifth embodiment is provided with an accommodation recess 40 in which the inner steel pipe 30 and the cylindrical laminated rubber 32 are accommodated when the cylindrical laminated rubber 32 undergoes shear deformation on the upper surface of the lower flange plate 16. And the point by which the control means 22 is comprised by the inner side steel pipe 30 and the bottom face 4002 of the accommodation recessed part 40 differs from 1st Embodiment.
That is, the lower surface of the head 2402 of the anchor bolt 24 has an outer diameter that is equal to or smaller than the outer diameter of the inner steel pipe 30 and is formed so as to be able to contact the inner steel pipe 30.
Bolt insertion holes 1604 are formed in the lower flange plate 16, and the inner steel pipe 30 and the cylindrical laminated rubber 32 are accommodated when the outer steel pipe 34 is displaced upward with respect to the inner steel pipe 30 at the upper part of the bolt insertion hole 1604. And a housing recess 40 having a bottom surface 4002 capable of contacting the lower surface of the inner steel pipe 30 is provided.
With the lower flange plate 16 fastened to the lower structure 12 via the anchor bolts 24 inserted into the bolt insertion holes 26, 1604, 3602, the lower surface of the head 2402 of the anchor bolt 24 and the upper surface of the inner steel pipe 30 And the lower surface of the outer steel pipe 34 are in contact with the upper surface of the lower flange plate 16, and the inner steel pipe 30 and the cylindrical laminated rubber 32 are positioned above the housing recess 40. That is, the outer steel pipe 34 is coupled to the lower flange plate 16 so that the lower flange plate 16 is integrally displaced with respect to the direction away from the lower structure 12. Further, the inner steel pipe 30 is coupled to the anchor bolt 24 so that the lower flange plate 16 cannot be displaced in the direction away from the lower structure 12.

  According to the fifth embodiment, when the axial tensile force is applied to the seismic isolation laminated rubber 14, the cylindrical laminated rubber 32 undergoes shear deformation in the housing recess 40, and the seismic isolation device 10 is The tensile deformation of the seismic isolation laminated rubber 14 can be suppressed to a small level from the lower structure 12, and the lower surface of the inner steel pipe 30 abuts against the bottom surface 4002 of the housing recess 40, so Since the upper limit of the amount is regulated, the same effect as that of the first embodiment can be obtained. Also in this embodiment, similarly to the fourth embodiment, there is an advantage that the outer peripheral portion of the outer steel pipe 34 and the lower flange plate 16 do not need to be threaded, and the processing and installation are easy.

  In the above embodiment, the case where the present invention is applied to the lower structure 12 and the lower flange plate 16 is described. However, the present invention may be applied to the upper structure and the upper flange plate. Further, the present invention may be applied to both the lower structure 12 and the lower flange plate 16, and the upper structure and the upper flange plate.

In the above embodiment, the case where the bolt-attached laminated rubber 20 having the cylindrical laminated rubber 32 is a separate member from the anchor bolt 24 and the lower flange plate 16 has been described. 24 or the lower flange plate 16 (or the upper flange plate).
For example, in the embodiment shown in FIGS. 5 and 6, the inner steel pipe 30 may be integrated with the anchor bolt 24. In this case, as shown in FIG. 9A, the inner steel pipe 30 is omitted, the inner peripheral surface of the cylindrical laminated rubber 32 is joined to the shaft portion 2420 of the anchor bolt 24, and the anchor bolt 24 and the cylindrical laminated layer are joined. The rubber 32 is integrated. 9B, the inner peripheral surface of the cylindrical laminated rubber 32 is joined to the large diameter portion 2422 of the anchor bolt 24, and the anchor bolt 24 and the cylindrical laminated rubber 32 are integrated. .
In the embodiment shown in FIGS. 1, 3, and 4, the outer steel pipe 32 may be integrated with the lower flange plate 16 (or the upper flange plate). In this case, as shown in FIGS. 10A and 10B, the outer steel pipe 32 is omitted, and the cylindrical laminated rubber 32 is formed on the inner peripheral surface of the hole 1620 of the lower flange plate 16 (or the upper flange plate). The outer peripheral surface is joined, and the lower flange plate 16 (or the upper flange plate) and the cylindrical laminated rubber 32 are integrated.

In the present embodiment, the case where the inner steel pipe 30, the cylindrical laminated rubber 32, and the outer steel pipe 34 are all annular and the laminated rubber 20 for bolt mounting is also annular has been described. The shapes of the laminated rubber 32, the outer steel pipe 34, and the bolted laminated rubber 20 are not limited to an annular shape.
For example, in the embodiment shown in FIGS. 1 to 4, the inner steel pipe 30 and the cylindrical laminated rubber 32 may have a polygonal cross section, and the inner peripheral portion of the outer steel pipe 34 may have a polygonal cross section. Further, when the outer steel pipe 34 is attached to the lower flange plate 16 by means other than screw connection, for example, when the outer steel pipe 34 is attached to the lower flange plate 16 using an adhesive, the shape of the outer steel pipe 34 is a polygonal cross section. Various shapes of the outer peripheral portion of the outer steel pipe 34 are conceivable, such as providing a large diameter portion and a small diameter portion and providing a step therebetween.
Moreover, in embodiment shown in FIGS. 5-6, it is good also considering the inner side steel pipe 30, the cylindrical laminated rubber 32, the outer side steel pipe 34, and the laminated rubber 20 for bolt attachment as the cylinder of a polygonal cross section. Furthermore, you may make the outer peripheral part of the outer side steel pipe 34 arbitrary shapes.
In the embodiment shown in FIG. 9, the shaft portion 2420 has a polygonal cross section, the cylindrical laminated rubber 32 has a polygonal cross section, the inner peripheral portion of the outer steel pipe 34 has a polygonal cross section, and the outer steel pipe 34. In the embodiment shown in FIG. 10, the inner steel pipe 30 and the cylindrical laminated rubber 32 may be formed in a cylindrical shape having a polygonal cross section.
Further, the use of the laminated rubber 20 for bolt attachment is not limited to the seismic isolation device 10 and is widely applied to locations where shear force is transmitted but tensile force is not transmitted as much as possible.

DESCRIPTION OF SYMBOLS 10 ... Seismic isolation device 12 ... Lower structure 14 ... Seismic isolation laminated rubber 16 ... Lower flange plate 20 ... Bolt mounting laminated rubber 22 ... Restriction means 24 ... Anchor bolt 2402 ... Head 2406 ... Abutting portions 26, 1604, 3602 ... Bolt insertion holes 30 ... Inner steel pipe 32 ... Cylindrical laminated rubber 34 ... Outer steel pipe 40 ... Containing recess

Claims (6)

Seismic isolation rubber, upper flange plate provided on the upper part of the base isolation rubber and attached to the upper structure, and lower part of the base isolation rubber via anchor bolts A seismic isolation device comprising a lower flange plate attached to the structure of
An inner steel pipe, a cylindrical laminated rubber constituted by alternately laminating a thin cylindrical rubber sheet and a thin steel pipe on the outer peripheral surface of the inner steel pipe on the outer side in the radial direction of the inner steel pipe, and the cylindrical lamination An outer steel pipe attached to the outer peripheral surface of the rubber, the inner space of the inner steel pipe is provided with a bolt-attached laminated rubber that is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted,
In a state where the flange plate is attached to the structure through the anchor bolt inserted into the bolt insertion hole, the outer steel pipe is integrally displaced with respect to the direction in which the flange plate is separated from the structure. The inner steel pipe is coupled to the anchor bolt so that the flange plate cannot move in the direction away from the structure, and the cylindrical laminated rubber can be shear-deformed in the vertical direction. It is in a state,
Regulating means provided it is to restrict the upper limit of the vertical deformation of the tubular laminated rubber,
In the state where the flange plate is attached to the structure through the anchor bolts inserted through the bolt insertion holes, the cylindrical laminated rubber is opposite to the direction in which the seismic isolation laminated rubber is pulled vertically. A load is applied in the direction of
A seismic isolation device characterized by that. Seismic isolation rubber, upper flange plate provided on the upper part of the base isolation rubber and attached to the upper structure, and lower part of the base isolation rubber via anchor bolts A seismic isolation device comprising a lower flange plate attached to the structure of
An inner steel pipe, a cylindrical laminated rubber constituted by alternately laminating a thin cylindrical rubber sheet and a thin steel pipe on the outer peripheral surface of the inner steel pipe on the outer side in the radial direction of the inner steel pipe, and the cylindrical lamination An outer steel pipe attached to the outer peripheral surface of the rubber, the inner space of the inner steel pipe is provided with a bolt-attached laminated rubber that is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted,
In a state where the flange plate is attached to the structure through the anchor bolt inserted into the bolt insertion hole, the outer steel pipe is integrally displaced with respect to the direction in which the flange plate is separated from the structure. The inner steel pipe is coupled to the anchor bolt so that the flange plate cannot move in the direction away from the structure, and the cylindrical laminated rubber can be shear-deformed in the vertical direction. It is in a state,
Regulating means provided it is to restrict the upper limit of the vertical deformation of the tubular laminated rubber,
The lower surface of the head of the anchor bolt is formed so as to be able to contact an axial end surface of the outer steel pipe on the side away from the structure,
In the place of the shaft portion near the head of the anchor bolt, an abutting portion that has an outer diameter that is equal to or smaller than the outer diameter of the inner steel pipe is provided that can contact the inner steel pipe,
A bolt insertion hole is formed in the flange plate, and when the flange plate is displaced in the vertical direction in a direction away from the structure together with the outer steel pipe at a position of the bolt insertion hole on the side away from the structure. An accommodation recess that enables accommodation of the inner steel pipe and the cylindrical laminated rubber is provided,
With the flange plate attached to the structure through the anchor bolts inserted into the bolt insertion holes, the contact portion and the inner steel pipe are in contact with each other, and the outer steel pipe on the structure side An axial end surface is in contact with a portion of the lower flange plate around the housing recess, and an axial end surface of the outer steel pipe away from the structure is located away from the lower surface of the head of the anchor bolt. positioned,
A seismic isolation device characterized by that. Seismic isolation rubber, upper flange plate provided on the upper part of the base isolation rubber and attached to the upper structure, and lower part of the base isolation rubber via anchor bolts A seismic isolation device comprising a lower flange plate attached to the structure of
An inner steel pipe, a cylindrical laminated rubber constituted by alternately laminating a thin cylindrical rubber sheet and a thin steel pipe on the outer peripheral surface of the inner steel pipe on the outer side in the radial direction of the inner steel pipe, and the cylindrical lamination An outer steel pipe attached to the outer peripheral surface of the rubber, the inner space of the inner steel pipe is provided with a bolt-attached laminated rubber that is a bolt insertion hole through which the shaft portion of the anchor bolt is inserted,
In a state where the flange plate is attached to the structure through the anchor bolt inserted into the bolt insertion hole, the outer steel pipe is integrally displaced with respect to the direction in which the flange plate is separated from the structure. The inner steel pipe is coupled to the anchor bolt so that the flange plate cannot move in the direction away from the structure, and the cylindrical laminated rubber can be shear-deformed in the vertical direction. It is in a state,
Regulating means provided it is to restrict the upper limit of the vertical deformation of the tubular laminated rubber,
The bottom surface of the head of the anchor bolt has an outer diameter that is equal to or smaller than the outer diameter of the inner steel pipe, and is formed so as to be able to contact one end face in the axial direction of the inner steel pipe,
A bolt insertion hole is formed in the flange plate, and when the flange plate is displaced in the vertical direction in a direction away from the structure together with the outer steel pipe at a position of the bolt insertion hole on the side away from the structure. An accommodation recess having a bottom surface capable of accommodating the inner steel pipe and the cylindrical laminated rubber and capable of contacting the other end face in the axial direction of the inner steel pipe,
With the flange plate attached to the structure through the anchor bolt inserted through the bolt insertion hole, the lower surface of the head of the anchor bolt and one end surface in the axial direction of the inner steel pipe are in contact with each other. One end surface in the axial direction of the outer steel pipe is in contact with the lower flange plate, and the outer side of the housing recess is in a direction in which the inner steel pipe and the cylindrical laminated rubber are separated from the structure in the vertical direction. Located at
A seismic isolation device characterized by that. The outer rubber tube is attached to the flange plate in a non-displaceable manner in the vertical direction so that the laminated rubber for bolt mounting is incorporated in the flange plate in advance.
In the place of the shaft portion near the head of the anchor bolt, an abutting portion having an outer diameter of a dimension equal to or smaller than the outer diameter of the inner steel pipe is provided that can come into contact with the end surface in the axial direction of the inner steel pipe,
With the flange plate attached to the structure via the anchor bolt inserted through the bolt insertion hole, the contact portion and the axial end surface of the inner steel pipe are in contact with each other,
The seismic isolation device according to claim 1 . The anchor bolt includes a head, a shaft projecting from the head, a male screw formed at the front of the shaft and coupled to the structure side, and the shaft just below the head. A second male screw part having a male screw formed at the part,
The abutment portion is configured by a nut screwed into the second male screw portion.
The seismic isolation device according to claim 1, 2 or 4 . The lower surface of the head of the anchor bolt is formed so as to be able to contact the outer steel pipe in the axial direction of the anchor bolt,
The restricting means is composed of the bottom surface of the head of the anchor bolt and the outer steel pipe.
The seismic isolation device according to claim 2 .

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