Horizontal deformation restraint device and method for seismic isolation devices

Abstract

To provide a device and a method for restraining horizontal deformation of a base isolation device which is simple and inexpensive.SOLUTION: A device 100 for restraining horizontal deformation of a base isolation device 16 provided at a base isolation layer 14 between an upper structure 10 and a lower structure 12 for constituting a skeleton of a base isolation building, and includes a restraining material 18 which is provided at the base isolation layer 14 outside of the base isolation device 16 so as to restrain the horizontal deformation of the base isolation device 16, and connects the upper structure 10 and the lower structure 12 in an oblique direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a horizontal displacement restraint device and method for restraining the horizontal deformation of the seismic isolation rubber of a seismic isolation device when constructing a seismic isolation building.

Background Art

[0002] Conventionally, seismic isolation buildings equipped with seismic isolation devices have been known (for example, see Patent Document 1). When constructing such seismic isolation buildings, the seismic isolation rubber of the seismic isolation device may be horizontally restrained so as not to deform. By doing so, it is possible to ensure safety during construction. In addition, when the upper beam of the seismic isolation device is a steel beam, it is possible to restrain the deformation of the seismic isolation rubber caused by thermal contraction associated with the welding of the steel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present inventor has conducted intensive studies to develop a simple and inexpensive horizontal deformation restraint device. As a result, the present invention using the frame of the seismic isolation building has been achieved.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a simple and inexpensive horizontal deformation restraint device and method for a seismic isolation device.

Means for Solving the Problems

[0006] To solve the above-mentioned problems and achieve the objective, the horizontal deformation restraint device for a seismic isolation device according to the present invention is a device for restraining the horizontal deformation of a seismic isolation device provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismic isolation building, and is characterized by comprising a restraint member provided in the seismic isolation layer outside the seismic isolation device to restrain the horizontal deformation of the seismic isolation device, and connecting the superstructure and the substructure in an oblique direction.

[0007] Furthermore, the horizontal deformation restraint device for another seismic isolation device according to the present invention is characterized in that, in the above-described invention, the restraint member is arranged diagonally so as it goes from top to bottom it approaches the seismic isolation device, the upper end of the restraint member is fixed to a steel section provided on the superstructure via mounting hardware, and the lower end of the restraint member is fixed to the intersection of the upper surface and the side surface of the lower structure via a buffer material.

[0008] Furthermore, the method for restraining the horizontal deformation of a seismic isolation device according to the present invention is a method for restraining the horizontal deformation of a seismic isolation device provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismically isolated building, characterized in that a restraining member is provided in the seismic isolation layer outside the seismic isolation device, which connects the superstructure and the substructure in an oblique direction in order to restrain the horizontal deformation of the seismic isolation device.

[0009] Furthermore, another method for restraining horizontal deformation of a seismic isolation device according to the present invention is characterized in that, in the above-described invention, the restraining member is arranged diagonally so as it goes from top to bottom it approaches the seismic isolation device, the upper end of the restraining member is fixed to a structural steel provided on the upper structure via mounting hardware, and the lower end of the restraining member is fixed to the intersection of the upper surface and the side surface of the lower structure via a buffer material. [Effects of the Invention]

[0010] The present invention provides a horizontal deformation restraint device for a seismic isolation device, which is provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismically isolated building, for restraining the horizontal deformation of the seismic isolation device. The device is provided in the seismic isolation layer on the outside of the seismic isolation device to restrain the horizontal deformation of the seismic isolation device and includes a restraining member that connects the superstructure and the substructure in an oblique direction. This provides the advantage of providing a simple and inexpensive horizontal deformation restraint device for a seismic isolation device.

[0011] Furthermore, according to the horizontal deformation restraint device for another seismic isolation device of the present invention, the restraint member is arranged diagonally so as it moves from top to bottom, it approaches the seismic isolation device, the upper end of the restraint member is fixed to a steel section provided on the upper structure via mounting hardware, and the lower end of the restraint member is fixed to the intersection of the upper surface and side surface of the lower structure via a buffer material. This provides the effect of allowing the restraint member to be easily attached while also providing sufficient restraining force.

[0012] Furthermore, the method for restraining the horizontal deformation of a seismic isolation device according to the present invention is a method for restraining the horizontal deformation of a seismic isolation device provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismically isolated building. In order to restrain the horizontal deformation of the seismic isolation device, a restraining member is provided on the seismic isolation layer outside the seismic isolation device, which connects the superstructure and the substructure in an oblique direction. This provides the effect of providing a simple and inexpensive method for restraining the horizontal deformation of a seismic isolation device.

[0013] Furthermore, according to another method for restraining horizontal deformation of a seismic isolation device according to the present invention, the restraining member is arranged diagonally so as it goes from top to bottom it approaches the seismic isolation device, the upper end of the restraining member is fixed to a steel section provided on the superstructure via mounting hardware, and the lower end of the restraining member is fixed to the intersection of the upper surface and side surface of the substructure via a buffer material. This method has the effect of allowing the restraining member to be easily attached while also providing sufficient restraining force. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a side cross-sectional view showing Embodiment 1 of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention. [Figure 2] Figure 2 is a horizontal cross-sectional view showing Embodiment 1 of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention. [Figure 3] Figure 3 is a side cross-sectional view showing Embodiment 2 of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention. [Figure 4] Figure 4 is a side cross-sectional view showing Embodiment 3 of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention. [Figure 5] Figure 5 is a side cross-sectional view showing Embodiment 4 of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention. [Figure 6] Figure 6 is an enlarged view of the main part of this third embodiment, where (1) is a side section view and (2) is a cross section view. [Figure 7] Figure 7 is an enlarged view of the main part of this embodiment 4, where (1) is a side section view and (2) is a cross section view. [Modes for carrying out the invention]

[0015] Embodiments of the horizontal deformation restraint device and method for seismic isolation devices according to the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to these embodiments.

[0016] (Embodiment 1) First, Embodiment 1 of the present invention will be described. As shown in Figures 1 and 2, the horizontal deformation restraint device 100 of the seismic isolation device according to this embodiment 1 is a device for restraining the horizontal deformation of a seismic isolation device 16 provided in the seismic isolation layer 14 between the superstructure 10 and the substructure 12 that constitute the frame of a seismically isolated building. It is provided in the seismic isolation layer 14 outside the seismic isolation device 16 to restrain the horizontal deformation of the seismic isolation device 16 and includes a restraint member 18 that connects the superstructure 10 and the substructure 12 in an oblique direction.

[0017] The upper structure 10 has a spigot member 22 provided coaxially at the lower end of a column 20 which is a body, and beam members 24 respectively fixed to the front, rear, left, and right side portions of the spigot member 22 with bolts or the like not shown in the figure. The spigot member 22 is composed of members such as steel materials and concrete. The beam member 24 is an H-shaped steel having an upper flange 26, a lower flange 28, and a web 30, and as shown in FIG. 2, extends respectively forward, rearward, leftward, and rightward from the spigot member 22 when viewed from above.

[0018] The lower structure 12 has a concrete slab 32 and a concrete base 34 provided on the upper surface of the slab 32. The base 34 is for installing the seismic isolation device 16 and is square when viewed from above as shown in FIG. 2.

[0019] The seismic isolation device 16 has a columnar laminated rubber 36 (seismic isolation rubber) in which a plurality of rubber layers and steel plates are alternately laminated in the vertical direction, and circular plates 38 and 40 coaxially attached to the upper and lower end faces of the laminated rubber 36. The upper plate 38 is fixed to the lower surface (horizontal plane) of the spigot member 22 of the upper structure 10 with anchor bolts not shown in the figure. The lower plate 40 is fixed to the upper surface (horizontal plane) of the base 34 of the lower structure 12 with anchor bolts not shown in the figure.

[0020] The restraint members 18 are provided at four locations on the front, back, left, and right sides of the base 34 and consist of wires 18A arranged in the same vertical plane along the extension direction of the beam member 24. These restraint members 18 are temporary materials that are removed after the completion of construction (before completion). The wires 18A are stretched diagonally so that they move away from the seismic isolation device 16 from top to bottom. The upper end of the wire 18A is inserted and fixed through the engagement hole 44 of the hook piece 42 welded to the lower flange 28 of the beam member 24. The lower end of the wire 18A is connected to an anchor 46 fixed to the upper surface of the slab 32. A lever block (registered trademark) 18B is connected to the wire 18A. The tension of the wire 18A can be adjusted by operating this lever block 18B. In the example shown in the figure, the inclination angle θ of the wire 18A with respect to the horizontal line is 30°, but the inclination angle θ can be set as appropriate depending on the installation environment of the seismic isolation device 16. Furthermore, while the example in the figure shows wires 18A installed at four locations on the front, back, left, and right sides of the base 34, the number of locations for installing wires 18A is not limited to this; any number of locations is acceptable. For example, increasing the degree of constraint at each location can reduce the number of installation locations.

[0021] The operation and function of the above configuration will be explained. First, the superstructure 10 and substructure 12 are constructed, and the fastening pieces 42 and anchors 46 are installed. The wire 18A of the restraining material 18 is temporarily placed between the fastening pieces 42 and anchors 46. Next, the seismic isolation device 16 is installed between the base 34 and the joint member 22. After that, welding work on the beam member 24 is performed in order to install the ancillary equipment. At this time, the tension of the wire 18A is adjusted with the lever block 18B to restrain the laminated rubber 36 of the seismic isolation device 16 horizontally so that it does not deform. This ensures safety during construction. It also restrains deformation of the laminated rubber 36 caused by thermal contraction due to welding of the beam member 24. After all construction is completed, the restraining material 18, fastening pieces 42 and anchors 46 are removed. To simplify the work, the fastening pieces 42 and anchors 46 may be left in place.

[0022] According to this embodiment 1, the restraining member 18 can exert sufficient restraining force, and the deformation of the laminated rubber 36 can be reliably restrained. Furthermore, it can be manufactured inexpensively and reused. On-site, only the installation and removal of the restraining member 18 is required, so it has little impact on the main construction process. Since construction precision is not required, the work is easy and the work safety is high. Moreover, it produces almost no waste material and is environmentally friendly. According to this embodiment 1, a simple and inexpensive horizontal deformation restraining device can be provided.

[0023] (Embodiment 2) Next, Embodiment 2 of the present invention will be described. As shown in Figure 3, the horizontal deformation restraint device 200 of the seismic isolation device according to this second embodiment is arranged in an oblique direction in which the restraint members 18 are positioned so that they move closer to the seismic isolation device 16 from top to bottom, compared to the first embodiment described above.

[0024] The restraining members 18 are provided at four locations on the front, back, left, and right sides of the base 34 and are composed of L-shaped steel arranged in the same vertical plane along the extension direction of the beam member 24. These restraining members 18 are temporary materials that are removed after the completion of construction (before completion). The restraining members of the present invention are not limited to L-shaped steel; other cross-sectional shapes of members with high rigidity and load-bearing capacity may be used. In the example shown in the figure, the inclination angle θ of the restraining member 18 with respect to the horizontal line is 30°, but the inclination angle θ can be appropriately set according to the installation environment of the seismic isolation device 16. In the example shown in the figure, restraining members 18 are provided at four locations on the front, back, left, and right sides of the base 34, but the number of restraining members 18 is not limited to this and can be any number. For example, if the degree of restraint per location is increased, the number of installation locations can be reduced.

[0025] The upper end of the restraining member 18 is detachably attached, for example, by mounting hardware 48 such as a Bullman, to a plate 50 protruding from the center of the lower surface of the lower flange 28 of the beam member 24. The plate 50 can be an L-shaped steel plate attached along the entire length of the beam member 24 for equipment mounting.

[0026] The lower end of the restraint member 18 is fixed to the intersection 52 of the upper surface of the slab 32 and each side of the base 34 via a buffer material 54. Specifically, a steel member 56 having an L-shaped cross-section is welded to the lower end of the restraint member 18. This steel member 56 is positioned in close contact with the L-shaped intersection 52 in a side view, with the buffer material 54 in between. The position of the lower end of the restraint member 18 relative to the intersection 52 is the center of each side of the square base 34 in a plan view. The buffer material 54 can be any material that allows the steel member 56 to be in close contact with the intersection 52, such as a rubber sheet, cement-based non-shrink mortar, or a mortar bag filled with cement-based non-shrink mortar. Considering ease of installation and removal, a rubber sheet is preferable.

[0027] The operation and function of the above configuration will be explained. First, the superstructure 10 and the substructure 12 are constructed, and the plate 50 is attached to the superstructure 10. Next, the upper end of the restraint member 18 is fixed to the plate 50 with mounting hardware 48 such as a pull-man fastener, and the steel member 56 at the lower end of the restraint member 18 is placed in close contact with the buffer material 54 provided at the intersection 52 of the base 34. Next, the seismic isolation device 16 is installed between the base 34 and the joint member 22. After that, welding work on the beam member 24 is carried out in order to install the ancillary equipment. The laminated rubber 36 of the seismic isolation device 16 is restrained horizontally through the axial force of the restraint member 18 so as not to deform. This ensures safety during construction. It also restrains deformation of the laminated rubber 36 caused by thermal shrinkage due to welding of the beam member 24. After all construction is completed, the restraint member 18, mounting hardware 48, and buffer material 54 are removed and taken away.

[0028] According to this second embodiment, the restraining member 18 can exert sufficient restraining force, and the deformation of the laminated rubber 36 can be reliably restrained. Furthermore, it can be manufactured inexpensively and reused. On-site, since only the installation and removal of the restraining member 18 is required, the impact on the main construction process is minimal. Since construction precision is not required, the work is easy and the work safety is high. In particular, compared to the first embodiment, the restraining member 18 can be installed easily in a short time, and since there is no structural work such as anchor bolt work, work efficiency can be further improved. Moreover, there is almost no waste material generated, making it environmentally friendly. According to this second embodiment, a simple and inexpensive horizontal deformation restraining device can be provided.

[0029] (Embodiment 3) Next, Embodiment 3 of the present invention will be described. As shown in Figure 4, the horizontal deformation restraint device 300 of the seismic isolation device according to this embodiment 3 corresponds to the case in the above embodiment 2 in which there is no plate 50 below the lower flange 28 of the beam member 24. Specifically, a gusset plate 58 is attached to the lower flange 28 in advance at the processing plant, and the gusset plate 58 and the restraint material 18 are connected at the construction site using mounting hardware 48. Even in this way, a simple and inexpensive horizontal deformation restraint device can be provided.

[0030] The construction procedure for this third embodiment involves, for example, welding the gusset plate 58 to the lower flange 28 in advance at a location other than the construction site (e.g., a processing plant such as an ironworks or a workshop on site). As shown in Figure 6, the gusset plate 58 is welded perpendicularly to the lower surface of the lower flange 28 so as to extend downward from the lower surface of the lower flange 28. The beam member 24, after welding in this manner, is then transported to the construction site. Subsequently, at the construction site, the gusset plate 58 and the restraint member 18 are fixed together with mounting hardware 48. However, the present invention is not limited to this, and instead of the gusset plate 58, a member such as an angle may be welded to the lower flange 28, and at the construction site, this member and the restraint member 18 may be connected and fixed together with mounting hardware 48. Furthermore, the connection between the restraint member 18 and the gusset plate 58 is not limited to mounting hardware 48, but may also be done by welding or bolting.

[0031] (Embodiment 4) Next, Embodiment 4 of the present invention will be described. As shown in Figure 5, the horizontal deformation restraint device 400 of the seismic isolation device according to this embodiment 4 addresses the case in the above embodiment 3 where it is not possible to attach the gusset plate 58 to the lower flange 28. Specifically, the restraint material 18 is joined to the lower flange 28 at the construction site via a splice plate 60 such as a plate. In this case, for example, as shown in Figure 7, the splice plate 60 is placed in contact with the lower surface of the lower flange 28, and the lower flange 28 and the splice plate 60 are fixed with mounting hardware 48 such as a pull-man connector. Even in this way, a simple and inexpensive horizontal deformation restraint device can be provided.

[0032] The construction procedure for this fourth embodiment involves, for example, welding the end of the restraint member 18 to the splice plate 60 in advance at a location other than the construction site (e.g., a factory such as an ironworks or a workshop on site). The restraint member 18, with the splice plate 60 welded in this manner, is then transported to the construction site. Subsequently, at the construction site, the splice plate 60 is placed in contact with the lower surface of the lower flange 28, and then the splice plate 60 and the lower flange 28 are connected and fixed with mounting hardware 48. However, the present invention is not limited to this, and the splice plate 60 and the lower surface of the lower flange 28 may be joined in advance at a location other than the construction site using mounting hardware 48 or welding, and then the beam member 24 may be transported to the construction site, where the splice plate 60 and the restraint member 18 are welded.

[0033] As described above, the horizontal deformation restraint device for a seismic isolation device according to the present invention is a device for restraining the horizontal deformation of a seismic isolation device provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismic isolation building. It is provided in the seismic isolation layer on the outside of the seismic isolation device to restrain the horizontal deformation of the seismic isolation device and includes a restraining member that connects the superstructure and the substructure in an oblique direction. Therefore, a simple and inexpensive horizontal deformation restraint device for a seismic isolation device can be provided.

[0034] Furthermore, according to the horizontal deformation restraint device of another seismic isolation device of the present invention, the restraint member is arranged diagonally so as it goes from top to bottom it approaches the seismic isolation device, the upper end of the restraint member is fixed to a steel section provided on the superstructure via mounting hardware, and the lower end of the restraint member is fixed to the intersection of the top surface and side surface of the substructure via a buffer material, so that the restraint member can be easily attached and a sufficient restraining force can be exerted.

[0035] Furthermore, the method for restraining the horizontal deformation of a seismic isolation device according to the present invention is a method for restraining the horizontal deformation of a seismic isolation device provided in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismically isolated building. In order to restrain the horizontal deformation of the seismic isolation device, a restraining member is provided on the seismic isolation layer outside the seismic isolation device that diagonally connects the superstructure and the substructure, thus providing a simple and inexpensive method for restraining the horizontal deformation of a seismic isolation device.

[0036] Furthermore, according to another method for restraining horizontal deformation of a seismic isolation device according to the present invention, the restraining member is arranged diagonally so as it goes from top to bottom it approaches the seismic isolation device, the upper end of the restraining member is fixed to a steel section provided on the superstructure via mounting hardware, and the lower end of the restraining member is fixed to the intersection of the upper surface and side surface of the substructure via a buffer material. Thus, the restraining member can be easily attached and can exert sufficient restraining force. [Industrial applicability]

[0037] As described above, the horizontal deformation restraint device and method for seismic isolation devices according to the present invention are useful for restraining the seismic isolation rubber of a seismic isolation device from deformation in the horizontal direction when constructing a seismic isolation building, and are particularly suitable for simple and inexpensive implementation. [Explanation of Symbols]

[0038] 10 Superstructure 12 Substructure 14. Seismic isolation layer 16. Seismic isolation device 18 Restraint material 18A wire 18B Lever Block 20 pillars 22 Joint members 24 Beam members 26 Upper flange 28 Lower flange 30 Web 32 Slabs 34 base 36 Laminated rubber 38, 40, 50 plates 42 Latch piece 44 Engagement holes 46 Anchors 48 Mounting hardware 52 Intersection 54 Cushioning material 56 Steel materials 58 Gusset Plate 100-400 Horizontal deformation restraint device for seismic isolation

Claims

1. A device for restraining the horizontal deformation of a seismic isolation device installed in the seismic isolation layer between the superstructure and the substructure that constitute the frame of a seismically isolated building when constructing the building, To restrain the horizontal deformation of the seismic isolation device, a restraining member is provided on the seismic isolation layer outside the seismic isolation device, and connects the upper structure and the lower structure in an oblique direction. The aforementioned restraining member is to be removed and dismantled before completion, and is arranged diagonally so as it moves from top to bottom, approaching the seismic isolation device, the upper end of the restraining member is fixed to a structural steel provided on the superstructure via mounting hardware, and the lower end of the restraining member is fixed to the intersection of the upper surface and side surface of the substructure via a buffer material, characterized in that it is a horizontal deformation restraining device for a seismic isolation device.

2. A method for restraining the horizontal deformation of a seismic isolation device installed in the seismic isolation layer between the superstructure and substructure that constitute the frame of a seismically isolated building when constructing the building, The process includes providing a restraining member in the seismic isolation layer outside the seismic isolation device to constrain the horizontal deformation of the seismic isolation device, which connects the upper structure and the lower structure in an oblique direction. A method for restraining the horizontal deformation of a seismic isolation device, characterized in that the restraining member is removed and taken away before completion, is arranged diagonally so as it moves from top to bottom, the upper end of the restraining member is fixed to a structural steel provided on the superstructure via mounting hardware, and the lower end of the restraining member is fixed to the intersection of the upper surface and side surface of the lower structure via a buffer material.

Images