Seismic isolation device and seismic isolation device system

Abstract

To design a seismic isolation device more easily, which has means for transmitting a load applied to a column to a spherical sliding bearing.SOLUTION: A seismic isolation device 1 comprises a spherical sliding bearing 10 having a slider, and a CFT column 20. An upper surface of the CFT column 20 is connected to a column P, and a lower surface of the CFT column 20 is connected to the spherical sliding bearing 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seismic isolation device and a seismic isolation device system including the seismic isolation device. [Background technology]

[0002] In a seismic isolation device that deflects earthquake energy and reduces the transmission of shaking to a building, an adjustment means may be provided to adjust the load applied to the seismic isolation device to a surface pressure (reference surface pressure) that the seismic isolation device can handle or less in order to ensure proper operation. For example, Patent Document 1 discloses a technology in which an adjustment means is placed between two seismic isolation devices with different reference surface pressures. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7350964 Summary of the Invention [Problem to be solved by the invention]

[0004] Among seismic isolation devices, spherical sliding bearings are known to be able to support loads with higher surface pressure than other seismic isolation devices. When spherical sliding bearings are placed as seismic isolation devices directly under the columns that make up the skeleton of a building, the slider moves on the sliding surface, so an adjustment means is required that can transmit the column load to the seismic isolation device at any position on the sliding surface.

[0005] In the past, when a building was made of steel (S-frame), for example, multiple rib plates were installed below the joints to transfer the column load to the seismic isolation device. However, this structure required welding work to be performed in a limited space, which made it difficult to manufacture. As such, it is difficult to design an adjustment means that can transfer the column load to the seismic isolation device at any position on the sliding surface, so a structure that makes design easier is desired.

[0006] An object of the present invention is to provide a seismic isolation device and seismic isolation system that can be designed more easily, in a seismic isolation device having means for transmitting the load received by a column to a spherical sliding bearing. [Means for solving the problem]

[0007] [1] A seismic isolation device according to one embodiment of the present invention is a seismic isolation device comprising a spherical sliding bearing having a slider and a CFT column, wherein the upper surface of the CFT column is connected to a column and the lower surface of the CFT column is connected to the spherical sliding bearing.

[0008] [2] In the above [1], it is preferable that the CFT column is circular in plan view, and the diameter of the CFT column in plan view is approximately the same as the diameter of the sliding surface of the spherical sliding bearing.

[0009] [3] In the above [1] or [2], the column is preferably a steel column or a CFT column.

[0010] [4] In the above [1] or [2], it is preferable that the lower surface of the CFT column is connected to the spherical sliding bearing via an anchor plate.

[0011] [5] A seismic isolation device system according to one embodiment of the present invention is a seismic isolation device system including a first seismic isolation device which is the seismic isolation device described in [1] or [2] above, and a second seismic isolation device which is the seismic isolation device described in [1] or [2] above, characterized in that the upper shoe of the first seismic isolation device is larger than the pillar of the first seismic isolation device in a planar view, and the upper shoe of the second seismic isolation device is smaller than the pillar of the second seismic isolation device in a planar view. [Effects of the Invention]

[0012] According to the present invention, it is possible to more easily design a seismic isolation device having a means for transmitting the load received by a column to a spherical sliding bearing. [Brief explanation of the drawings]

[0013] [Figure 1]1 is a cross-sectional view of a seismic isolation device according to an embodiment of the present invention. [Figure 2] A cross-sectional view perpendicular to the axis of the CFT column. [Figure 3] 1 is a cross-sectional view of a seismic isolation device according to an embodiment of the present invention, showing a state in which the upper shoe and the lower shoe have moved relative to each other in the horizontal direction. [Figure 4] 1 is a front view of a seismic isolation device system according to an embodiment of the present invention. [Figure 5] FIG. 1 is a cross-sectional view of a single pendulum spherical sliding bearing. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description will be omitted. Fig. 1 is a cross-sectional view of a seismic isolation device 1 according to an embodiment of the present invention. As shown in Fig. 1, the seismic isolation device 1 is placed between the ground and a column P that forms the skeleton of a building and extends in the vertical direction. By placing the seismic isolation device 1, the ground and the building are separated, making it difficult for earthquake vibrations to be transmitted to the building.

[0015] The building of this embodiment is a steel-framed (S-frame) building, with steel frames used for the main structural components. At least some of the columns P that make up the building's skeleton are S-framed columns. The seismic isolation device 1 is placed between the S-framed columns P and a foundation structure BC that is built on the ground.

[0016] The seismic isolation device 1 comprises a CFT column 20 that supports a column P, and a spherical sliding bearing 10 that supports the CFT column 20 and is arranged on a foundation structure BC. The spherical sliding bearing 10 is a double pendulum spherical sliding bearing, and has an upper shoe 11 (upper concave plate), a lower shoe 12 (lower concave plate), and a slider 13 that slides between the upper shoe 11 and the lower shoe 12.

[0017] The upper shoe 11 and the lower shoe 12 are identical in shape and are rectangular in plan view. The upper shoe 11 and the lower shoe 12 are made of rolled steel for welding structures (SM490A, B, C), rolled steel for building structures (SN490B, C), or carbon steel for machine structures (S45C). The lower surface of the upper shoe 11 and the upper surface of the lower shoe 12 are provided with a curvature-bearing upper sliding surface 11a and a curvature-bearing lower sliding surface 12a, respectively. The upper sliding surface 11a and the lower sliding surface 12a are stainless steel sliding plates. The upper shoe 11 and the lower shoe 12 have a stopper ring 14, annular in plan view, fixed to the outer periphery of the sliding plate to prevent the slider 13 from falling off.

[0018] The slider 13 has upper and lower sliding surfaces with curvature and is generally cylindrical. The slider 13 is made of rolled steel for welded structures (SM490A, B, C), rolled steel for building structures (SN490B, C), carbon steel for machine structures (S45C), stainless steel, or the like, and has a surface pressure of 235 N / mm 2 (235MPa) (long-term load-bearing strength: surface pressure 60N / mm 2 In this embodiment, the outer diameter of the slider 13 is 150 to 600 mm, for example, 200 mm.

[0019] A CFT (Concrete Filled Steel Tube) column 20 functions as a stress transmission device that transmits the load received by the column P to the spherical sliding bearing 10 at the joint between the column P and the seismic isolation device 1. As shown in Figures 1 and 2, the CFT column 20 has a steel pipe 21 that is circular in plan view and concrete 22 filled inside the steel pipe 21. In other words, the CFT column 20 has a structure in which concrete 22 is poured into the steel pipe 21, whose axis extends in the vertical direction, using, for example, a flexible hose, to form a column. The CFT column 20 of this embodiment has a cylindrical shape, and its diameter in plan view is approximately the same as the diameter of the upper sliding surface 11a of the upper shoe 11 of the spherical sliding bearing 10. The diameter of the CFT column 20 in plan view is preferably 0.8 to 1.2 times the diameter of the upper sliding surface 11a. The diameter of the CFT column 20 of this embodiment is, for example, 1320.8 mm, and the diameter of the upper sliding surface 11a is, for example, 1320 mm or 1270 mm. The steel pipe 21 is formed from a general structural carbon steel pipe (SKK400, STK490), a building structural carbon steel pipe (STKN490), a steel pipe pile (SKK400, SKK490), or the like.

[0020] The CFT column 20 in this embodiment is cylindrical, but is not limited to this, and a rectangular CFT column can also be used as long as it can cover the entire upper sliding surface 11a (lower sliding surface 12a) of the upper shoe 11 (lower shoe 12) when viewed in a plane. Furthermore, although the diameter of the CFT column 20 in this embodiment in a plan view is slightly larger than the diameter of the stopper ring 14, the diameter of the CFT column 20 in a plan view may be smaller than the diameter of the stopper ring 14.

[0021] The underside of the CFT column 20 is connected to the spherical sliding bearing 10 via an anchor plate 32. Specifically, the lower ends of the steel pipes 21 that make up the CFT column 20 are joined to the upper surface of the anchor plate 32, for example, by welding, and the anchor plate 32 and the upper shoe 11 of the spherical sliding bearing 10 are fastened together with anchor bolts. The anchor plate 32 can be made of, for example, rolled steel for welded structures (SM490A, B, C) or rolled steel for building structures (SN490B, C). The thickness of the anchor plate 32 is determined by adding the thinnest thickness of the upper shoe 11 to the surface pressure acting on the slider 13 (surface pressure of 60 N / mm for long-term load-bearing strength). 2 ) is dispersed and transmitted within the steel material, it is preferable to set it so that it is below the long-term allowable bearing stress of the filled concrete (in accordance with the Prestressed Concrete Design and Construction Standards and Commentary (Architectural Institute of Japan), etc.).

[0022] The upper surface of the CFT column 20 is connected to the column P via a diaphragm 31. The diaphragm 31 is joined to the upper end of the steel pipe 21 so as to close the steel pipe 21 that constitutes the CFT column 20. The thickness of the diaphragm 31 can be equal to or greater than the thickness of the steel pipe 21 and can be at least twice the thickness of the beam flange to which it is attached. The diaphragm 31 can be formed, for example, from rolled steel for welded structures (SM490A, B, C) or rolled steel for building structures (SN490B, C).

[0023] Furthermore, the seismic isolation device 1 is configured so that, in plan view, the column P is included inside the upper sliding surface 11a of the upper shoe 11 of the spherical sliding bearing 10. In other words, the spherical sliding bearing 10 is selected so that the diameter of the upper sliding surface 11a is larger than the diameter of the column P.

[0024] In this embodiment, a base plate 33 provided on the upper surface of the foundation structure BC and the lower shoe 12 are fixed so as not to move relative to each other. The base plate 33 is made of rolled steel for welded structures (SM490A, B, C) or rolled steel for building structures (SN490B, C), etc.

[0025] As shown in Fig. 3, the slider 13 slides between the upper shoe 11 and the lower shoe 12, allowing the upper shoe 11 and the lower shoe 12 to move relative to each other in the horizontal direction. As a result, when ground vibrations caused by earthquake motion are transmitted to the lower shoe 12, the lower shoe 12 moves relative to the upper shoe 11. This movement prevents the ground vibrations caused by earthquake motion from being transmitted to the column P via the upper shoe 11.

[0026] In the seismic isolation device 1 of the above embodiment, a CFT column 20 is used as a stress transmission device that transmits the load received by the column P to the spherical sliding bearing 10 at the joint between the column P and the seismic isolation device 1. Therefore, the seismic isolation device 1 of the above embodiment can be designed more easily than a stress transmission device having a structure in which, for example, multiple rib plates are provided around the column. Furthermore, manufacturing is easier, which improves economic efficiency. Furthermore, the confining effect of the steel pipe 21, which restrains the expanding concrete 22, can increase the bearing capacity of the concrete.

[0027] Furthermore, by making the CFT column 20 circular in plan view and making its diameter approximately the same as the diameter of the upper sliding surface 11a of the upper shoe 11 of the spherical sliding bearing 10, the CFT column 20 can function as a stress transmission device suitable for a spherical sliding bearing without being excessively large. Furthermore, regardless of the position of the slider 13 on the sliding surface of the spherical sliding bearing 10, the load received by the column P connected to the upper surface of the CFT column 20 can be concentrated and transmitted to the slider 13. This allows the load received by the column P to be transmitted to the slider 13 even if the slider 13 is in any position, for example, even if the slider 13 is located at the end of the upper sliding surface 11a of the spherical sliding bearing 10.

[0028] Furthermore, because column P is made of steel, it is easier to manufacture a structure in which the load received by the column is concentrated via the CFT column and transmitted to the spherical sliding bearing. Furthermore, since the underside of the CFT column 20 is connected to the spherical sliding bearing 10 via the anchor plate 32, the CFT column 20 and the spherical sliding bearing 10 are less likely to shift horizontally, and the CFT column 20 can be more reliably connected to the spherical sliding bearing 10. Furthermore, since the upper surface of the CFT column 20 is connected to the column P via the diaphragm 31, the diaphragm 31 can function as a lid for the concrete 22 poured inside the steel pipe 21 of the CFT column 20.

[0029] Next, a seismic isolation system including the seismic isolation device will be described. 4, the seismic isolation device system 100 is a system including a plurality of seismic isolation devices 1A, 1B, and is arranged between the ground and a building C. Specifically, the plurality of seismic isolation devices 1A, 1B are arranged between a plurality of columns P1, P2 that form the skeleton of the building C and a foundation structure BC that is provided on the ground.

[0030] The multiple seismic isolation devices 1A, 1B include a first seismic isolation device 1A which is the seismic isolation device of the above embodiment, and a second seismic isolation device 1B which is the seismic isolation device of the above embodiment. That is, the first seismic isolation device 1A and the second seismic isolation device 1B each include a spherical sliding bearing 10 and a CFT column 20 whose upper surface is connected to the columns P1, P2 and whose lower surface is connected to the spherical sliding bearing 10.

[0031] The columns of building C are a first column P1 supported by a first seismic isolation device 1A and a second column P2 supported by a second seismic isolation device 1B and having a diameter larger than that of the first column P1. In the seismic isolation device system 100 of this embodiment, the diameter of the first column P1 is smaller than the diameter of the upper sliding surface 11a of the spherical sliding bearing 10 that constitutes the first seismic isolation device 1A, and the diameter of the second column P2 is larger than the diameter of the upper sliding surface 11a of the spherical sliding bearing 10 that constitutes the second seismic isolation device 1B. In other words, the upper sliding surface 11a of the spherical sliding bearing 10 that constitutes the first seismic isolation device 1A is larger than that of the first column P1 in a plan view, and the upper sliding surface 11a of the spherical sliding bearing 10 that constitutes the second seismic isolation device 1B is smaller than that of the second column P2 in a plan view.

[0032] In this way, the diameters of the columns supported by the seismic isolation device may be different. More specifically, the diameter of some of the columns may be larger than the diameter of the sliding surfaces of the spherical sliding bearings that make up the seismic isolation device. Designers may use the same design for seismic isolation devices even if the diameter of the columns supported by some of the seismic isolation devices is larger than the diameter of the sliding surfaces of the spherical sliding bearings that make up the seismic isolation devices. By using the same design for all seismic isolation devices, it is possible to shorten the design work and reduce design costs.

[0033] In the above embodiments, a double-pendulum spherical sliding bearing 10 is used as the seismic isolation device 1, but this is not limited to this and a single-pendulum spherical sliding bearing can also be used. As shown in Figure 5, the single-pendulum spherical sliding bearing 10A has a base plate 33, a hinge 16 arranged on the base plate 33, a slider 13A supported by the hinge 16, and an upper shoe 11. The slider 13A has a spherical surface whose radius corresponds to the spherical radius of the sliding surface of the upper shoe 11, and a spherical surface whose radius corresponds to the spherical radius of the hinge 16. The slider slides on the sliding surface. The hinge has an articulation function so as to accommodate the rotation of the slider.

[0034] In addition, although the columns P of the building in this embodiment are steel columns, they may also be CFT columns. By using CFT columns as the columns that form the building's skeleton, the bearing capacity of the concrete can be increased due to the confining effect. [Explanation of symbols]

[0035] 1...seismic isolation device, 1A...first seismic isolation device, 1B...second seismic isolation device, 10...spherical sliding bearing, 11...upper shoe, 11a...upper sliding surface, 12...lower shoe, 12a...lower sliding surface, 13...slider, 14...stopper ring, 20...CFT column, 21...steel pipe, 22...concrete, 31...diaphragm, 32...anchor plate, 100...seismic isolation device system, BC...foundation structure, C...building, P...column, P1...first column, P2...second column.

Claims

1. a spherical sliding bearing having a slider; CFT columns, A seismic isolation device comprising: the top surface of the CFT pillar is connected to the pillar; The lower surface of the CFT column is connected to the spherical sliding bearing. A seismic isolation device characterized by:

2. The CFT pillar is circular in plan view, The diameter of the CFT column in a plan view is approximately the same as the diameter of the sliding surface of the spherical sliding bearing. The seismic isolation device according to claim 1 .

3. The column is a steel column or a CFT column. The seismic isolation device according to claim 1 or 2.

4. The lower surface of the CFT column is connected to the spherical sliding bearing via an anchor plate. The seismic isolation device according to claim 1 or 2.

5. A seismic isolation device system including a first seismic isolation device that is the seismic isolation device according to claim 1 or claim 2, and a second seismic isolation device that is the seismic isolation device according to claim 1 or claim 2, an upper shoe of the first seismic isolation device is larger than the column of the first seismic isolation device in a plan view; an upper shoe of the second seismic isolation device is smaller than the column of the second seismic isolation device in a plan view; A seismic isolation system characterized by:

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