Horizontal deformation restraint device

Abstract

To provide a horizontal deformation restraining device capable of allowing shrinkage deformation of laminated rubber while restraining horizontal deformation of the laminated rubber in construction.SOLUTION: The horizontal deformation restraining device is attached to a seismic isolation device 2 having a lower flange 21 (second flange) fixed to a lower structure 12, an upper flange 22 (first flange) fixed to an upper structure 13, and a laminated rubber 23 provided between the lower flange 21 and the upper flange 22, and includes a lower flange fixing part 3 (second flange fixing part) fixed to the lower flange 21, and an upper flange fixing part 4 (first flange fixing part) connected to the lower flange fixing part 3 and fixed to the upper flange 22. The upper flange fixing part 4 is restrained in horizontal displacement relative to the upper flange 22 and is allowed in vertical displacement relative to the upper flange 22, while the lower flange fixing part 3 is restrained in horizontal and vertical displacement relative to the lower flange 21.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a horizontal deformation restraint device. [Background technology]

[0002] A known seismic isolation device installed in a seismically isolated building is one that uses laminated rubber, which is made up of rubber and steel plates stacked together. During the construction of a seismically isolated building, horizontal deformation of the laminated rubber may be restrained to ensure safety. Patent documents 1 to 4 disclose restraining devices that are used during the construction of a seismically isolated building to restrain horizontal deformation of the laminated rubber. The restraining devices are fixed to the upper and lower flanges of the laminated rubber, and are configured to restrain the relative displacement between the upper flange of the laminated rubber and the lower flange of the laminated rubber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-317216 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-278407 [Patent Document 3] Japanese Patent Application Publication No. 10-115104 [Patent Document 4] Japanese Patent Application Laid-Open No. 2002-317571 Summary of the Invention [Problem to be solved by the invention]

[0004] During the construction of a base-isolated building, the load on the upper part increases as the construction progresses, causing the laminated rubber to shrink and deform. However, the restraint devices disclosed in Patent Documents 1-4 restrain the relative displacement in the vertical direction between the upper flange and the lower flange, so as the shrinkage deformation of the laminated rubber progresses, an additional load is applied to the restraint device, which may make it impossible to remove.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a horizontal deformation restraint device that can restrain horizontal deformation of laminated rubber during construction while allowing contraction deformation of the laminated rubber. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the horizontal deformation restraint device of the present invention is attached to a seismic isolation device that is provided between a lower structure and an upper structure that are capable of relative horizontal displacement, and has a lower flange fixed to the lower structure, an upper flange fixed to the upper structure, and laminated rubber provided between the lower flange and the upper flange, and has a lower flange fixing portion fixed to the lower flange, and an upper flange fixing portion connected to the lower flange fixing portion and fixed to the upper flange, wherein a first flange fixing portion that is one of the lower flange fixing portion and the upper flange fixing portion restrains horizontal relative displacement between the first flange fixed to the lower flange and the first flange of the upper flange, while allowing vertical relative displacement between the first flange and the first flange, and a second flange fixing portion that is the other of the lower flange fixing portion and the upper flange fixing portion restrains horizontal and vertical relative displacement between the second flange fixed to the second flange of the lower flange and the second flange of the upper flange.

[0007] In the present invention, the horizontal relative displacement between the first flange fixing portion and the first flange is restrained, and the horizontal relative displacement between the second flange fixing portion connected to the first flange fixing portion and the second flange is restrained. This allows the horizontal relative displacement between the first flange and the second flange to be restrained, and the horizontal deformation of the laminated rubber between the first flange and the second flange to be restrained. Furthermore, since the vertical relative displacement between the first flange fixing portion and the first flange is permitted, the vertical relative displacement between the first flange and the second flange is permitted. This allows the shrinkage deformation of the laminated rubber to be tolerated. For example, during construction of a seismically isolated building equipped with a seismic isolation device, even if the load on the upper part increases as construction progresses and a shrinkage force acts on the laminated rubber, the application of additional load to the horizontal deformation restraint device can be prevented.

[0008] In addition, the horizontal deformation restraint device of the present invention may have a first bolt that fixes the first flange fixing portion to the first flange and a second bolt that fixes the second flange fixing portion to the second flange, and the first bolt may be threaded into the first flange and inserted into a hole that penetrates in the vertical direction and is formed in the first flange fixing portion so as to be movable in the vertical direction.

[0009] This configuration allows the first flange and the first flange fixing portion to be displaced relative to each other in the vertical direction along the first bolt. Also, the horizontal deformation restraint device can be easily attached to the first flange and the second flange (upper flange and lower flange) with the first bolt and the second bolt.

[0010] In addition, the horizontal deformation restraint device of the present invention may have a first bolt that fixes the first flange fixing portion to the first flange and a second bolt that fixes the second flange fixing portion to the second flange, and the first bolt may be threaded into the first flange fixing portion and inserted into a hole portion extending in the vertical direction formed in the first flange so as to be movable in the vertical direction.

[0011] This configuration allows the first flange and the first flange fixing portion to be displaced relative to each other in the vertical direction along the first bolt. Also, the horizontal deformation restraint device can be easily attached to the first flange and the second flange (upper flange and lower flange) with the first bolt and the second bolt.

[0012] In addition, the horizontal deformation restraint device of the present invention may have a connecting portion that connects the lower flange fixing portion and the upper flange fixing portion, wherein the lower flange fixing portion is formed in a flat plate shape and is provided along the upper surface of the lower flange, and the upper flange fixing portion is formed in a flat plate shape and is provided along the lower surface of the upper flange, and the connecting portion is provided along the side of the laminated rubber, with its lower end joined to the lower flange fixing portion and its upper end joined to the upper flange fixing portion.

[0013] This configuration allows the horizontal deformation restraint device to be installed in a compact shape between the lower flange and the upper flange. Furthermore, because the horizontal deformation restraint device can be made simple and compact, it can be manufactured easily and inexpensively and can be easily attached to the seismic isolation device. [Effects of the Invention]

[0014] According to the present invention, it is possible to restrain horizontal deformation of the laminated rubber during construction while allowing contraction deformation of the laminated rubber. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a front view of a seismic isolation device to which a horizontal deformation restraint device according to an embodiment of the present invention is attached. [Figure 2] 1 is a plan view of a seismic isolation device to which a horizontal deformation restraint device according to an embodiment of the present invention is attached. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line BB in FIG. 3. [Figure 5]10A and 10B are diagrams illustrating a method for attaching a horizontal deformation restraint device to a seismic isolation device. [Figure 6] FIG. 10 is a cross-sectional view of a horizontal deformation restraint device according to a modified embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] A horizontal deformation restraint device according to an embodiment of the present invention will now be described with reference to FIGS. As shown in Figures 1 and 2, the horizontal deformation restraint device 1 according to this embodiment is installed to restrain the horizontal displacement of a seismic isolation device 2 during construction of a seismic isolated building 11 (see Figure 1). The seismic isolation device 2 is placed between a lower structure 12 and an upper structure 13 of the seismic isolated building 11. The seismic isolation device 2 is installed on the lower structure 12 and supports the upper structure 13. The lower structure 12 and the upper structure 13 are configured to be able to move relative to each other in the horizontal direction.

[0017] The seismic isolation device 2 has a lower flange 21 (second flange) fixed to the lower structure 12, an upper flange 22 (first flange) fixed to the upper structure 13, and a laminated rubber 23 provided between the lower flange 21 and the upper flange 22. The lower flange 21 is formed in a disk shape and is fixed along the upper surface of the lower structure 12. The upper flange 22 is formed in a disk shape and is fixed along the lower surface of the upper structure 13. The laminated rubber 23 is formed by laminating rubber and steel plates and has a cylindrical shape. The lower flange 21, the laminated rubber 23, and the upper flange 22 are arranged coaxially, and in a plan view seen from the top-bottom direction, the lower flange 21 and the upper flange 22 are formed larger than the laminated rubber 23. In this embodiment, the lower flange 21 and the upper flange 22 are disk-shaped, and the laminated rubber 23 is cylindrical, but this is not limiting. For example, the lower flange 21 and the upper flange 22 may be rectangular plate-shaped, and the laminated rubber 23 may be prismatic.

[0018] A plurality of horizontal deformation restraint devices 1 are installed around the axis of one seismic isolation device 2 at intervals. As shown in Figure 1-4, the horizontal deformation restraint device 1 has a lower flange fixing portion 3 (second flange fixing portion) fixed to the lower flange 21, an upper flange fixing portion 4 (first flange fixing portion) fixed to the upper flange 22, and a connecting portion 5 connecting the lower flange fixing portion 3 and the upper flange fixing portion 4.

[0019] As shown in Figure 3, the lower flange fixing portion 3 is formed in a flat plate shape and is arranged along the upper surface of the lower flange 21 on the side of the laminated rubber 23. The lower flange fixing portion 3 is fixed to the lower flange 21 with a lower bolt 6. The lower flange 21 is formed with a lower flange bolt hole 211 into which the lower bolt 6 is inserted. The lower flange fixing portion 3 is formed with a lower flange fixing portion bolt hole 31 through which the lower bolt 6 passes. The lower flange bolt hole 211 and the lower flange fixing portion bolt hole 31 are arranged in positions that overlap in the vertical direction.

[0020] The lower bolt 6 has a threaded portion 61 and a head 62. The threaded portion 61 of the lower bolt 6 is inserted from above into the lower flange fixing portion bolt hole 31 and the lower flange bolt hole 211, with the threaded portion 61 facing downward and the head 62 facing upward. The threaded portion 61 of the lower bolt 6 is threadedly engaged with the lower flange fixing portion bolt hole 31 and the lower flange bolt hole 211, respectively. The head 62 of the lower bolt 6 is pressed against the upper surface of the lower flange fixing portion 3. The lower bolt 6 is fixed so as to restrain relative displacement between the lower flange 21 and the lower flange fixing portion 3 in both the horizontal and vertical directions.

[0021] The upper flange fixing portion 4 is formed in a flat plate shape and is arranged along the underside of the upper flange 22 on the side of the laminated rubber 23. A gap is provided between the upper surface of the upper flange fixing portion 4 and the underside of the upper flange 22. The upper flange fixing portion 4 is fixed to the upper flange 22 with an upper bolt 7. The upper flange 22 is formed with an upper flange bolt hole 221 into which the upper bolt 7 is inserted. The upper flange fixing portion 4 is formed with an upper flange fixing portion bolt hole 41 (hole portion) that penetrates in the vertical direction and into which the upper bolt 7 is inserted. The upper flange bolt hole 221 and the upper flange fixing portion bolt hole 41 are arranged in positions that overlap in the vertical direction.

[0022] The upper bolt 7 has a threaded portion 71 and a head 72. The threaded portion 71 of the upper bolt 7 is inserted from below into the upper flange fixing portion bolt hole 41 and the upper flange bolt hole 221, with the threaded portion 71 facing upward and the head 72 facing downward. The threaded portion 71 of the upper bolt 7 is threadedly engaged with the upper flange bolt hole 221. The inner diameter of the upper flange fixing portion bolt hole 41 is slightly larger than the outer diameter of the upper bolt 7, allowing the upper flange fixing portion 4 and the upper bolt 7 to move relative to each other in the vertical direction. In other words, the upper bolt 7 is loose in the vertical direction relative to the upper flange fixing portion bolt hole 41. The head 72 of the upper bolt 7 is disposed below the upper flange fixing portion 4 with a gap therebetween. As described above, the upper flange fixing portion 4 and the upper flange 22 are disposed with a gap therebetween in the vertical direction. The upper bolt 7 and the upper flange fixing portion 4 are capable of relative displacement in the vertical direction within the distance between the upper flange 22 and the upper flange fixing portion 4 and the distance between the upper flange fixing portion 4 and the head 72 of the upper bolt 7. In other words, the upper bolt 7 restrains the relative displacement between the upper flange 22 and the upper flange fixing portion 4 in the horizontal direction, but fixes the upper flange 22 and the upper flange fixing portion 4 in a manner that allows their relative displacement in the vertical direction.

[0023] The connecting portion 5 is formed in a flat plate shape and is disposed to the side of the laminated rubber 23. The lower end portion 51 of the connecting portion 5 is joined to the edge portion 32 of the lower flange fixing portion 3 on the laminated rubber 23 side, and the upper end portion 52 is joined to the edge portion 42 of the upper flange fixing portion 4 on the laminated rubber 23 side. The lower flange fixing portion 3 and the upper flange fixing portion 4 are connected by the connecting portion 5 so as to prevent relative displacement in either the vertical or horizontal direction. The upper flange fixing portion 4, the lower flange fixing portion 3 and the connecting portion 5 are joined so as to form a C-shape when viewed from the side.

[0024] In this embodiment, a rib 8 is provided to connect the side edge of the lower flange fixing portion 3 and the side edge of the connecting portion 5. The combined portion of the lower flange fixing portion 3, upper flange fixing portion 4, connecting portion 5 and rib 8 of the horizontal deformation restraint device 1 is referred to as a main body portion 9.

[0025] Because the lower flange fixing portion 3, the upper flange fixing portion 4 and the connecting portion 5 of the main body portion 9 are joined in a C-shape, even if an external force acts in the horizontal direction, the connecting portion 5 restrains horizontal deformation, thereby suppressing the horizontal relative displacement between the lower flange fixing portion 3 and the lower flange 21, and the horizontal relative displacement between the upper flange fixing portion 4 and the upper flange 22, and preventing the upper bolt 7 and the lower bolt 6 from coming loose.

[0026] When the horizontal deformation restraint device 1 is used to restrain horizontal deformation of the seismic isolation device 2 (horizontal deformation of the laminated rubber 23), such as during construction of the seismic isolated building 11 or maintenance of the seismic isolation device 2, the main body 9 is fixed to the lower flange 21 with the lower bolts 6 and to the upper flange 22 with the upper bolts 7. Once construction or maintenance is complete and there is no longer any need to restrain horizontal deformation of the seismic isolation device 2, the lower bolts 6 and the upper bolts 7 are removed and the main body 9 is removed from the seismic isolation device 2. The lower bolts 6 and the upper bolts 7 may be tightened from the side of the seismic isolation device using a socket wrench 14, as shown in Figure 5. The removed horizontal deformation restraint device 1 can also be reused in another seismic isolated building.

[0027] Next, the operation and effect of the horizontal deformation restraint device according to the present embodiment will be described. In the horizontal deformation restraint device 1 according to this embodiment, the relative horizontal displacement between the lower flange fixing portion 3 and the lower flange 21 is restrained, and the relative horizontal displacement between the upper flange fixing portion 4 and the upper flange 22 is restrained, thereby restraining the relative horizontal displacement between the upper flange 22 and the lower flange 21. This allows the horizontal deformation of the laminated rubber 23 between the upper flange 22 and the lower flange 21 to be restrained. Furthermore, because the upper bolts 7 are loose in the vertical direction relative to the upper flange fixing portion bolt holes 41, the relative vertical displacement between the upper flange fixing portion 4 and the upper flange 22 is permitted, thereby allowing the relative vertical displacement between the upper flange 22 and the lower flange 21. This allows the shrinkage deformation of the laminated rubber 23 to be tolerated. For example, during construction of a seismically isolated building 11 equipped with a seismic isolation device 2, even if the load on the upper part increases as construction progresses and a shrinkage force acts on the laminated rubber 23, the horizontal deformation restraint device 1 can be prevented from being subjected to an additional load.

[0028] In addition, the horizontal deformation restraint device 1 according to this embodiment has a lower bolt 6 that fixes the lower flange fixing portion 3 to the lower flange 21, and an upper bolt 7 that fixes the upper flange fixing portion 4 to the upper flange 22, and the upper bolt 7 is threaded into the upper flange 22 and is inserted into an upper flange fixing portion bolt hole 41 that penetrates in the vertical direction and is formed in the upper flange fixing portion 4 so as to be movable in the vertical direction. With this configuration, the upper flange 22 and the upper flange fixing portion 4 can be displaced relative to each other in the vertical direction along the upper bolt 7. Furthermore, the horizontal deformation restraint device 1 can be easily attached to the lower flange 21 and the upper flange 22 with the lower bolt 6 and the upper bolt 7.

[0029] In addition, the horizontal deformation restraint device 1 according to this embodiment has a connecting portion 5 that connects the lower flange fixing portion 3 and the upper flange fixing portion 4, the lower flange fixing portion 3 being formed in a flat plate shape and provided along the upper surface of the lower flange 21, the upper flange fixing portion 4 being formed in a flat plate shape and provided along the lower surface of the upper flange 22, the connecting portion 5 being provided along the side of the laminated rubber 23, the lower end portion 51 being joined to the lower flange fixing portion 3 and the upper end portion 52 being joined to the upper flange fixing portion 4. With this configuration, the horizontal deformation restraint device 1 can be installed in a compact shape between the lower flange 21 and the upper flange 22. Furthermore, because the horizontal deformation restraint device 1 can be made into a simple and compact shape, the horizontal deformation restraint device 1 can be manufactured easily and inexpensively, and can be easily attached to the seismic isolation device 2. Furthermore, the horizontal deformation restraint device 1 can be diverted to other seismically isolated buildings.

[0030] Although the embodiment of the horizontal deformation restraint device according to the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate within the scope of the invention. For example, in the above embodiment, the lower flange fixing portion 3 is constrained from relative displacement in the horizontal and vertical directions relative to the lower flange 21, and the upper flange fixing portion 4 is constrained from relative displacement in the horizontal direction relative to the upper flange 22, but is allowed to move relative to the upper flange 22 in the vertical direction. In contrast, the upper flange fixing portion 4 may be constrained from relative displacement in the horizontal and vertical directions relative to the upper flange 22, and the lower flange fixing portion 3 may be constrained from relative displacement in the horizontal direction relative to the lower flange 21, but is allowed to move relative to the lower flange 21 in the vertical direction. In other words, the upper flange fixing portion and the upper flange 22 may be the second flange fixing portion and the second flange of the present invention, and the lower flange fixing portion 3 and the lower flange 21 may be the first flange fixing portion and the first flange of the present invention.

[0031] In the above embodiment, the lower bolt 6 fixes the lower flange fixing portion 3 to the lower flange 21, and the upper bolt 7 fixes the upper flange fixing portion 4 to the upper flange 22. The upper bolt 7 is threaded into the upper flange bolt hole 221 formed in the upper flange 22 and is inserted into the upper flange fixing portion bolt hole 41 formed in the upper flange fixing portion 4 and passing through in the vertical direction so as to be movable in the vertical direction. However, as long as the horizontal relative displacement between the lower flange fixing portion 3 and the lower flange 21 is restrained, the horizontal relative displacement between the upper flange fixing portion 4 and the upper flange 22 is restrained, and the vertical relative displacement between the upper flange fixing portion 4 and the upper flange 22 is permitted, the fixing of the lower flange fixing portion 3 to the lower flange 21 and the fixing of the upper flange fixing portion 4 to the upper flange 22 may be performed by a fixing joint other than the lower bolt 6 and the upper bolt 7 described above.

[0032] For example, as in the horizontal deformation restraint device 1B shown in FIG. 6 , an upper bolt 7B may be fixed to the upper flange fixing portion 4 and be movable in the vertical direction relative to the upper flange 22B, allowing relative displacement in the vertical direction between the upper flange fixing portion 4 and the upper flange 22B. Specifically, the threaded portion 71B of the upper bolt 7B has no threads formed on its tip end, but has threads formed on its head 72 end. The tip end (non-threaded portion) of the threaded portion 71B has a smaller root diameter than the head 72 end (threaded portion). The upper flange fixing portion bolt hole 41B of the upper flange fixing portion 4B has threads formed on its inner circumferential surface that mesh with the threads of the upper bolt 7B. The inner diameter of the upper flange bolt hole 221B formed in the upper flange 22 is larger than the outer diameter of the tip end (non-threaded portion) of the threaded portion 71B of the upper bolt 7B. The upper bolt 7B is screwed into the upper flange fixing portion bolt hole 41B, and is inserted through the upper flange bolt hole 221B (hole) formed in the upper flange 22 so as to be movable in the up and down direction.

[0033] Furthermore, in the above embodiment, there is provided a connecting portion 5 that connects the lower flange fixing portion 3 and the upper flange fixing portion 4, the lower flange fixing portion 3 being formed in a flat plate shape and provided along the upper surface of the lower flange 21, the upper flange fixing portion 4 being formed in a flat plate shape and provided along the lower surface of the upper flange 22, and the connecting portion 5 being provided along the side surface of the laminated rubber 23, with the lower end portion 51 joined to the lower flange fixing portion 3 and the upper end portion 52 joined to the upper flange fixing portion 4. However, the lower flange fixing portion 3 and the upper flange fixing portion 4 may be connected by a member having a shape other than the connecting portion 5. Furthermore, in the above embodiment, the main body 9 is provided with a rib 8 that connects the side edge of the lower flange fixing portion 3 and the side edge of the connecting portion 5, but the rib 8 does not have to be provided as long as the performance of the horizontal deformation restraint device 1 can be ensured. [Explanation of symbols]

[0034] 1,1B Horizontal deformation restraint device 2 Seismic isolation device 3 Lower flange fixing part (second flange fixing part) 4 Upper flange fixing part (first flange fixing part) 5 Connecting part 6 Lower bolt (second bolt) 7,7B Upper bolt (first bolt) 12 Undercarriage 13 Superstructure 21 Lower flange (second flange) 22 Upper flange (first flange) 23 Multilayer rubber 41 Upper flange fixing bolt hole (hole) 51 Lower end 52 Upper end 221B Upper flange bolt hole (hole)

Claims

1. The base isolation device is provided between a lower structure and an upper structure that are relatively displaceable in the horizontal direction, and has a lower flange fixed to the lower structure, an upper flange fixed to the upper structure, and laminated rubber provided between the lower flange and the upper flange, a lower flange fixing portion fixed to the lower flange; an upper flange fixing portion connected to the lower flange fixing portion and fixed to the upper flange, a first flange fixing portion, which is one of the lower flange fixing portion and the upper flange fixing portion, is constrained from horizontal relative displacement between the first flange fixing portion of the lower flange and the upper flange to which it is fixed, and is allowed to be vertically displaced relative to the first flange; a second flange fixing portion, which is the other of the lower flange fixing portion and the upper flange fixing portion, is constrained from relative displacement in the horizontal direction and the up-down direction between the second flange fixing portion of the lower flange and the upper flange and the second flange to which it is fixed, a connecting portion that connects the lower flange fixing portion and the upper flange fixing portion, the lower flange fixing portion is formed in a flat plate shape and is provided along an upper surface of the lower flange, the upper flange fixing portion is formed in a flat plate shape and is provided along the lower surface of the upper flange, the connecting portion is formed in a flat plate shape and provided along a side surface of the laminated rubber, the lower end portion being joined to the lower flange fixing portion and the upper end portion being joined to the upper flange fixing portion, a pair of ribs are provided connecting the side edge of the lower flange fixing portion and the upper end of the connecting portion, the rib is formed in a triangular plate shape in a side view so as to connect an end portion of the side edge portion of the lower flange fixing portion, which is formed in a rectangular flat plate shape in a plan view, opposite to the end portion to which the connecting portion is connected, to an upper end portion of the connecting portion to which the upper flange fixing portion is connected; a first bolt that fixes the first flange fixing portion to the first flange; a second bolt that fixes the second flange fixing portion to the second flange; and the first bolt is threadedly engaged with the first flange and inserted into a hole formed in the first flange fixing portion, the hole penetrating the first flange in the vertical direction, so as to be movable in the vertical direction; a head of the first bolt is disposed with a gap between it and the first flange fixing portion, A horizontal deformation restraint device in which the first flange fixing portion and the first flange are arranged at an interval in the vertical direction.

2. The base isolation device is provided between a lower structure and an upper structure that are relatively displaceable in the horizontal direction, and has a lower flange fixed to the lower structure, an upper flange fixed to the upper structure, and laminated rubber provided between the lower flange and the upper flange, a lower flange fixing portion fixed to the lower flange; an upper flange fixing portion connected to the lower flange fixing portion and fixed to the upper flange, a first flange fixing portion, which is one of the lower flange fixing portion and the upper flange fixing portion, is constrained from horizontal relative displacement between the first flange fixing portion of the lower flange and the upper flange to which it is fixed, and is allowed to be vertically displaced relative to the first flange; a second flange fixing portion, which is the other of the lower flange fixing portion and the upper flange fixing portion, is constrained from relative displacement in the horizontal direction and the up-down direction between the second flange fixing portion of the lower flange and the upper flange and the second flange to which it is fixed, a connecting portion that connects the lower flange fixing portion and the upper flange fixing portion, the lower flange fixing portion is formed in a flat plate shape and is provided along an upper surface of the lower flange, the upper flange fixing portion is formed in a flat plate shape and is provided along the lower surface of the upper flange, the connecting portion is formed in a flat plate shape and provided along a side surface of the laminated rubber, the lower end portion being joined to the lower flange fixing portion and the upper end portion being joined to the upper flange fixing portion, a pair of ribs are provided connecting the side edge of the lower flange fixing portion and the upper end of the connecting portion, the rib is formed in a triangular plate shape in a side view so as to connect an end portion of the side edge portion of the lower flange fixing portion, which is formed in a rectangular flat plate shape in a plan view, opposite to the end portion to which the connecting portion is connected, to an upper end portion of the connecting portion to which the upper flange fixing portion is connected; a first bolt that fixes the first flange fixing portion to the first flange; a second bolt that fixes the second flange fixing portion to the second flange; and the first bolt is threadedly engaged with the first flange fixing portion and inserted into a hole portion extending in the vertical direction and formed in the first flange so as to be movable in the vertical direction; a head of the first bolt is disposed with a gap between it and the first flange fixing portion, A horizontal deformation restraint device in which the first flange fixing portion and the first flange are arranged at an interval in the vertical direction.

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