JP3800530B2 - Seismic isolation device mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device mounting structure.
[0002]
[Prior art]
In recent years, various seismic isolation devices have been developed to minimize shaking and damage caused by earthquakes in buildings and condominiums.
In this seismic isolation device, so-called laminated rubber having a structure in which rubber and steel plates are alternately laminated in the vertical direction is often used. Laminated rubber is interposed between, for example, a lower housing such as a building foundation and an upper housing constructed on the upper side of this lower housing. By deforming in the direction, the vibration period of the upper housing is extended, and the vibration energy of the upper housing is absorbed by the damping mechanism provided in the seismic isolation device to suppress shaking.
[0003]
[Problems to be solved by the invention]
However, conventional seismic isolation devices have the following problems.
That is, laminated rubber often used as a seismic isolation device has a rubber inside, but this rubber has a sufficiently high vertical compression strength but a low tensile strength. For this reason, when the tensile force in the vertical direction is excessively applied to the laminated rubber, cracks and voids are generated in the rubber, the rigidity and strength are significantly reduced, and the function as a seismic isolation device cannot be achieved.
[0004]
As a countermeasure to such a problem, a convex portion that protrudes upward is provided on the upper connecting plate of the laminated rubber, and a concave portion that fits into the convex portion is provided on the lower surface of the upper casing. There has been proposed one in which an upper casing is placed on a laminated rubber so as to be able to float up by being fitted (Japanese Patent Laid-Open No. 10-306616).
[0005]
However, in such a seismic isolation device, the upper housing is supported so as to be lifted, so that it is possible to prevent a tensile force from acting on the seismic isolation device, but between the seismic isolation device and the upper housing. In other cases, bending moment is not transmitted, and excessive force acts on the connecting part of the seismic isolation device with the upper frame, or the seismic characteristics of the structure itself change.
[0006]
In view of the above circumstances, in the present invention, when a tensile force is applied to the structure, the upper casing is allowed to lift without exerting a tensile force on the laminated rubber of the seismic isolation device. It is possible to transmit the bending moment between the seismic isolation device and make the seismic isolation device function soundly over a long period of time.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
In other words, the seismic isolation device mounting structure according to claim 1 is interposed between the upper housing and the lower lower housing that supports the seismic isolation device, and allows the upper housing to float in a horizontal direction while allowing the upper housing to float. A structure for mounting a seismic isolation device using laminated rubber that dampens applied vibration, and a concrete-filled steel pipe for transmitting shearing force and bending moment is applied to the upper connecting plate of the laminated rubber fixed on the lower housing. It is attached so as to protrude upward, and the concrete-filled steel pipe is fitted into a recess formed in the lower surface of the upper casing, and between the outer peripheral surface of the concrete-filled steel pipe and the inner peripheral surface of the recess of the upper casing. Further, it is characterized in that an edge cutting member made of a ring-shaped elastic material that allows relative movement in the axial direction of both is interposed.
[0008]
In such a configuration, since the concrete-filled steel pipe of the seismic isolation device and the concave portion of the upper housing are fitted for horizontal input, horizontal vibration acting on the upper housing is absorbed by the laminated rubber. The In addition, for the input in the vertical direction, only the concrete-filled steel pipe and the recess are fitted, and the upper casing is allowed to lift, so that the compressive force is transmitted but the tensile force is not transmitted. The tensile force does not work on the laminated rubber. In addition, since the bending moment is transmitted between the upper frame and the seismic isolation device through the concrete-filled steel pipe, other forces excluding the tensile force, that is, compressive force, shear force, and bending moment are transmitted between them. As a result, the upper housing can be ideally attenuated.
Further, since an edge cutting member that allows relative movement in the axial direction between the outer peripheral surface of the concrete-filled steel pipe and the inner peripheral surface of the concave portion of the upper casing is interposed, when constructing the upper casing For example, even if the concrete of the upper frame adheres to the outer periphery of the concrete-filled steel pipe, the edge of the upper frame and the concrete-filled steel pipe is cut by the edge cutting member. As a result, it does not affect the seismic isolation device.
Further, since the ring-shaped elastic material is used as the edge cutting member, the ring-shaped elastic material is appropriately deformed even if the concrete of the upper casing remains attached to the outer peripheral side of the ring-shaped elastic material. The substantial edge between the concrete-filled steel pipe and the upper housing can be cut without peeling.
[0009]
According to a second aspect of the present invention, the seismic isolation device according to the first aspect is characterized in that a reinforcing plate is embedded below the concrete-filled steel pipe.
In such a configuration, it is possible to efficiently reinforce the concrete-filled steel pipe to which an excessive force is applied, which is a substantial connecting portion between the laminated rubber and the upper casing, and thus enhances the soundness of the seismic isolation device, It is possible to reduce the diameter of the concrete-filled steel pipe and reduce the thickness of the steel pipe.
[0012]
Mounting structure of the vibration isolating apparatus according to claim 3, wherein, in the one described in claim 1 or 2, so as to surround the recess of the upper skeleton, that has been embedded U-shaped plan configuration of rebar in the upper skeleton It is a feature.
In such a configuration, the concrete-filled steel pipe transmits compressive force, shearing force, and bending moment to and from the upper housing, respectively, so that strong strength is required, and accordingly, the upper housing that fits into the concrete-filled steel tube is required. The recessed side is also required to have strong strength, but because the U-shaped reinforcing bar is embedded in advance outside the recessed portion, the vicinity of the recessed portion of the upper housing has sufficient strength to meet these requirements. Have.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 illustrates a super high-rise seismic isolation structure equipped with a base isolation device mounting structure according to the present invention. FIG. 1 (a) is a schematic side view of the super high-rise seismic isolation structure, and FIG. FIG.
[0014]
In this seismic isolation structure, seismic isolation devices 9 and 10 are attached between a lower casing 2 made of a foundation and an upper casing 3 supported by the base casing.
In this type of seismic isolation structure, when the ratio of height H to width B (aspect ratio) increases, the variable axial force due to the overturning moment during an earthquake increases, and a tensile force may be generated in the corner column 1a. . Further, since the outer column 1b has a long-term axial force larger than that of the corner column 1a, a tensile force is hardly generated there, but it may occur rarely.
[0015]
Here, a seismic isolation device 10 using a laminated rubber 11 that damps vibrations acting on the upper housing 3 in the horizontal direction while allowing the upper housing 3 to lift is installed below the corner column 1a where a tensile force is likely to be generated. ing. It should be noted that the seismic isolation device 10 using the laminated rubber 11 that allows the upper casing 3 to lift is not limited to the lower side of the corner column 1a, but may be installed below the outer column 1b. . However, since the tensile force is hardly generated in the middle column 1c, a seismic isolation device 9 using a normal laminated rubber that does not allow the upper casing 3 to be lifted is installed therebelow.
[0016]
The seismic isolation device 10 that allows the upper casing 3 to lift is interposed between the lower casing 2 and the upper casing 3 as described above. Specifically, it is interposed between the corner column 1a of the upper housing 3 and the joint portion 6 of the connecting beam 5 and the lower lower housing 2 that supports it (see FIG. 2).
[0017]
Here, the seismic isolation device 10 is fixed to the lower housing 2 and transmits the compression force Fa, the bending moment Fb, and the shearing force Fc to the joint 6 between the column 1a of the upper housing 3 and the connecting beam 5, respectively. The tensile force Fd is not transmitted.
[0018]
The specific configuration of the seismic isolation device 10 will be described. As shown in FIG. 3, a plurality of lower flanges 12 of the laminated rubber 11 are provided on the upper surface of the lower casing 2 so as to draw a circle on the lower casing 2. It is fixed by anchor bolts 13.
The laminated rubber 11 is formed by alternately laminating circular steel plates 15 and rubber 16 between the lower flange 12 and the upper flange 14 as in the prior art. The plate 18 is fixed by a plurality of bolts 17 provided at intervals in the circumferential direction.
[0019]
A concrete-filled steel pipe 20 for transmitting shearing force and bending moment is fixed to the upper connecting plate 18 so as to protrude upward and to be coaxial with the laminated rubber 11. The concrete-filled steel pipe 20 is composed of a cylindrical steel pipe 21 whose bottom surface is butt welded to the upper connecting plate 18 and high-strength concrete 22 filled in the cylindrical steel pipe 21. The high-strength concrete 22 is placed in advance before the concrete placement for constructing the connecting beam 5 and the like of the upper frame 3 is performed.
[0020]
A reinforcing plate 23 is provided below the cylindrical steel pipe 21 as necessary. Here, the reinforcing plate 23 is assembled in a cross shape in plan view, and the outer periphery thereof is welded to the inner peripheral surface of the cylindrical steel pipe 21 to be fixed to the cylindrical steel pipe 21 in an upright state (FIG. 4). reference). Note that the reinforcing plate 23 is not necessarily limited to one that is assembled in a cross shape in plan view, and is, for example, assembled so as to extend radially outward at predetermined angles (for example, 60 degrees or 45 degrees). If it is, it is preferable.
[0021]
On the other hand, a concave portion 25 is provided on the lower surface of the joint portion 6 between the corner column 1a of the upper frame 3 and the connecting beam 5, and this concave portion 25 is located above the concrete-filled steel pipe 20 although its downward relative movement is restricted. Relative movement to is possible. The compression force Fa, the bending moment Fb and the shearing force Fc are transmitted between the recess 25 and the concrete-filled steel pipe 20 as described above.
[0022]
Between the outer peripheral surface of the concrete-filled steel pipe 20 and the inner peripheral surface of the concave portion 25 of the joint portion 6, a ring-shaped elastic material 26 (for example, laminated rubber) that functions as an edge cutting member that allows relative movement in the axial direction of the two. 11 of the same kind as the rubber 16). The ring-shaped elastic material 26 is externally fitted to the upper and lower ends of the concrete-filled steel pipe 20 with a predetermined height dimension hb, and does not transmit force between the ring-shaped elastic materials 26, for example, a flexible material such as a styrofoam. The property board | plate material 27 is interposed.
[0023]
Here, the height dimension ha of the concrete-filled steel pipe 20 and the height dimension hb of the ring-shaped elastic member 26 are affected by an earthquake or the like, as shown in FIG. When a horizontal displacement occurs between the lower housing 2 and the lower housing 2, it is set to a level that can sufficiently withstand the concrete bearing pressure acting from the two joint portions 6 of the upper housing. Therefore, when the value (ha-2hb) obtained by subtracting twice the height dimension hb of the ring-shaped elastic material 26 from the height dimension ha of the concrete-filled steel pipe 20 is small, the flexible plate 27 is omitted. All can be rationally constructed as the ring-shaped elastic material 26.
[0024]
In addition, you may affix a steel plate to the outer peripheral part of the ring-shaped elastic material 26 as needed, and as an edge cutting member between the concrete filling steel pipe 20 and the recessed part 25 of the junction part 6, it shows in a figure. Instead of the ring-shaped elastic material 26, a ring-shaped material made of polytetrafluoroethylene or stainless steel material may be used.
[0025]
As shown in FIGS. 6 and 7, the joint 6 of the upper housing 3 is also an extension of the corner post 1 a, so that a hoop line 29 embedded in the post is also arranged so as to surround the recess 25. In this case, when the bending moment Fb or shearing force Fc transmitted from the concrete-filled steel pipe 20 of the seismic isolation device 10 cannot be counteracted by this alone, the vicinity of the concave portion 25 of the joint 6 of the upper housing 3 so as to surround the concrete-filled steel pipe 20 The reinforcing bars 30 in the vicinity of the recesses 25 may be reinforced by embedding reinforcing bars 30 having a U-shape in plan view along the beams 5 at predetermined heights in two orthogonal directions. Moreover, the lower end reinforcement 31 of the connecting beam 5 is fixed upward for reinforcement for lifting.
[0026]
Although not shown, a damping mechanism (damper) that absorbs vibration energy is provided between the lower housing 2 and the upper housing 3. However, if the laminated rubber 11 is a laminated rubber with a lead plug or a highly damped laminated rubber, a damping device (damper) can be omitted separately.
In FIG. 6, reference numeral 32 denotes an air pipe for introducing air so that the space between the upper surface of the concrete-filled steel pipe 20 and the bottom surface of the recess 25 does not become a vacuum when the corner pillar 1 a of the upper housing 3 is lifted. .
[0027]
Next, the operation of the seismic isolation structure having the structure for mounting the seismic isolation device having the above-described configuration will be described.
When a horizontal force is applied to the seismic isolation structure due to an earthquake or the like, the concrete-filled steel pipe 20 and the concave portion 25 of the upper housing 3 are fitted, so that the laminated rubber 11 and the upper housing 3 are apparently integrated. The laminated rubber 11 extends the period of the horizontal vibration of the upper casing 3 and absorbs the vibration energy acting on the upper casing 3 by the damping mechanism, so that the structure can be isolated.
[0028]
In addition, when a falling moment acts on the seismic isolation structure due to an earthquake or the like, a large fluctuating axial force acts on the corner column 1a. There are two types of variable axial force, the compression direction and the tensile direction, but the laminated rubber 11 has sufficient strength against the variable axial force in the compression direction and is not damaged.
[0029]
On the other hand, when a variable axial force in the tensile direction acts on the corner column 1a, the corner column 1a tends to float together with the junction 6 below the corner column 1a. At this time, the recess 25 and the seismic isolation device of the junction 6 are used. 10 is simply engaged with the concrete-filled steel pipe 20, and the upward relative movement of the joint 6 with respect to the concrete-filled steel pipe 20 is not restricted and is free. For this reason, the corner pillar 1a and the joint part 6 therebelow move upward without giving any tensile force to the seismic isolation device 10. At this time, transmission of the tensile force to the laminated rubber 11 of the seismic isolation device 10 is not performed.
[0030]
Therefore, the soundness of the laminated rubber 11 can be maintained such that the rubber 16 constituting the seismic isolation device 10 does not have cracks or gaps and the rigidity and strength of the laminated rubber 11 do not decrease. The function as a seismic isolation device can be maintained.
[0031]
When the corner pillar 1a and the joint portion 6 below it are about to rise, the corner pillar 1a and the like are not restrained from being moved upward by the seismic isolation device 10 and the lower housing 2 directly below. The connecting beam 5 extending sideways is provided integrally with the portion 6, and the connecting beam 5 restrains the upward movement of the joint 6 and the like. Therefore, the floating amount σ of the corner column 1a and the joint portion 6 below the corner column 1a is very small (see FIG. 5).
[0032]
Further, when the shearing force and the tensile force are simultaneously applied to the corner column 1a, the seismic isolation device 10 disposed below the corner column 1a has the upper flange 14 and the lower flange 12 horizontally as shown in FIG. At the same time, the corner pillar 1a and the joint portion 6 below the corner pillar 1a tend to float upward. At this time, a bending moment Fb acts on the concave portion 25 of the joint portion 6 from the concrete-filled steel pipe 20 of the seismic isolation device 10, and a concrete bearing pressure in the vicinity of the concave portion 25 counters this bending moment Fb. That is, the bending moment Fb is transmitted between the concrete-filled steel pipe 20 and the recess 25 through the ring-shaped elastic material 26. For this reason, the vibration of the seismic isolation structure itself can be attenuated soundly over a long period of time without changing the seismic characteristics of the seismic isolation structure itself.
[0033]
In addition, as described above, an excessive force of shearing force, bending moment, and compressive force is applied to the concrete-filled steel pipe 20 and the recessed portion 25 which are substantial connecting portions between the seismic isolation device 10 and the upper housing 3. In the embodiment, the reinforcing plate 23 is embedded in the concrete-filled steel pipe 20 as necessary, and sufficient reinforcement is thereby achieved. Therefore, the seismic isolation device 10 is sound without damage to the concrete-filled steel pipe 20. In addition to improving the properties, the diameter of the concrete-filled steel pipe 20 and the thickness of the steel pipe 21 can be reduced.
[0034]
On the other hand, as shown in FIG. 6 and FIG. 7, if a structure in which a U-shaped reinforcing bar 30 is embedded in the upper casing 3 so as to surround the recess 25, the upper casing that fits into the concrete-filled steel pipe 20 is provided. Therefore, it is possible to meet the demand for strong strength required also on the side of the concave portion 25, so that the soundness of the seismic isolation structure can be further enhanced.
[0035]
In this embodiment, a ring-shaped elastic material 26 is interposed between the outer peripheral surface of the concrete-filled steel pipe 20 and the inner peripheral surface of the concave portion 25 of the upper housing 3, whereby the concrete-filled steel pipe 20 and the concave portion 25 are interposed. However, for example, when the upper casing 3 is constructed, the concrete of the upper casing adheres to the outer periphery of the ring-shaped elastic material 26. However, as shown in FIG. 5, when the ring-shaped elastic member 26 is appropriately deformed, the upper casing 3 can be allowed to float without applying a tensile force to the laminated rubber 11.
[0036]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and other configurations can be adopted without departing from the spirit of the present invention.
For example, in the above-described embodiment, the example in which the seismic isolation device mounting structure of the present invention is applied to a super-high-rise seismic isolation structure has been described. However, the seismic isolation device mounting structure of the present invention is applied. What is to be done is not limited to this type of structure, but it has a high-rise building, a building with a flat shape such as an L-shape or a trapezoidal shape in plan view, and a large roof that has buoyancy due to strong winds. It can also be applied to buildings that may result.
Moreover, in the said embodiment, although the seismic isolation apparatus 10 is interposed between the foundation and the upper housing 3 of the upper side, it is not restricted to this, The seismic isolation apparatus 10 is interposed between intermediate floors. You may make it make it.
[0037]
【The invention's effect】
As described above, the present invention has the following effects.
For horizontal input, the concrete-filled steel pipe and the recess of the upper housing are fitted, so horizontal vibration acting on the upper housing is absorbed by the laminated rubber, and for vertical input, Only the concrete-filled steel pipe and the recess are fitted, and the upper casing is allowed to lift, so that no tensile force acts on the laminated rubber. In addition, since the bending moment is transmitted between the upper frame and the seismic isolation device through the concrete-filled steel pipe, other forces excluding the tensile force, that is, compressive force, shearing force, and bending moment are transmitted between them. As a result, the upper housing can be ideally attenuated.
Therefore, by adopting the seismic isolation device mounting structure of the present invention, it is possible to proceed with design and construction without considering the presence of tensile force even for high-rise buildings with high aspect ratios, etc. Quality and economy can be satisfied at the same time.
[Brief description of the drawings]
FIG. 1 shows a seismic isolation structure having a base isolation device mounting structure according to an embodiment of the present invention, wherein (a) is a schematic side view and (b) is a schematic cross-sectional view.
FIG. 2 is a cross-sectional view of an essential part of a seismic isolation structure including a base isolation device mounting structure showing an embodiment of the present invention.
FIG. 3 is a side view of the seismic isolation device mounting structure showing an embodiment of the present invention.
4 is a cross-sectional view taken along the IV-IV battle of FIG.
FIG. 5 is a diagram for explaining the operation of the seismic isolation device mounting structure;
FIG. 6 is a side sectional view of the mounting structure of the seismic isolation device.
FIG. 7 is a cross-sectional plan view of the seismic isolation device mounting structure .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Corner column 1b Outer column 2 Lower frame 3 Upper frame 5 Connecting beam 6 Joint 10 Seismic isolation device 11 Laminated rubber 12 Lower flange 14 Upper flange 18 Upper connecting plate 20 Concrete filled steel pipe 21 Cylindrical steel tube 22 High strength concrete 23 Reinforcement Plate 25 Recess 26 Ring-shaped elastic material 30 Reinforcing bar in a U-shape in plan view

Claims (3)

A seismic isolation device using laminated rubber that is interposed between the upper housing and the lower lower housing that supports the upper housing, and that damps the vibration acting on the upper housing in a horizontal direction while allowing the upper housing to float. The mounting structure of
A concrete filled steel pipe for transmitting shearing force and bending moment is attached to the upper connecting plate of laminated rubber fixed on the lower housing so as to protrude upward,
The concrete-filled steel tube fitted in a recess formed in the lower surface of the upper skeleton,
Between the outer peripheral surface of the concrete-filled steel pipe and the inner peripheral surface of the concave portion of the upper housing, an edge cutting member made of a ring-shaped elastic material that allows relative movement in the axial direction of both is interposed. Seismic isolation device mounting structure. In the seismic isolation device mounting structure according to claim 1,
A structure for mounting a seismic isolation device, wherein a reinforcing plate is embedded in a lower portion of the concrete-filled steel pipe. In the seismic isolation device mounting structure according to claim 1 or 2,
A structure for mounting a seismic isolation device , wherein a U-shaped reinforcing bar is embedded in the upper casing so as to surround a recess of the upper casing .

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