Coupling structure for seismic isolation damper device

Abstract

To provide a coupling structure for a seismic isolation damper device that prevents interference with transmission of an extending and contracting stroke amount from a piston rod to a control piston rod through a transmission member.SOLUTION: A clevis 42 is disposed in an intermediate portion between a pair of upper and lower support plate parts 41a by having a metal spacer member 45 interposed between a lower side of an attachment bracket 41 and an upper surface of the lower support plate part 41a. The spacer member 45 includes a circular support part 45b that comes into contact with and supports a lower end of an inner ring 44a forming a spherical slide bearing 44 provided in the clevis 42, the circular support part protruding from an upper surface of a base plate 45a at a predetermined height. In addition, strip-shaped protrusions 45c are provided to extend on both sides along a diametrical direction of the circular support part 45b and protrude from the upper surface of the base plate 45a at a height lower than that of the circular support part 45b.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a connection structure of a seismic isolation damper device, and more particularly to a connection structure of a seismic isolation damper device installed between a foundation structure integrated with the foundation ground and a building supported by seismic isolation bearings. [Background technology]

[0002] For example, as a device for attenuating earthquake motion acting on a building supported by seismic isolation bearings, a seismic isolation damper device using an oil damper that is installed between the building and a foundation structure integrated with the foundation ground and absorbs energy during an earthquake is known (see, for example, Patent Document 1).

[0003] The seismic isolation damper device using an oil damper disclosed in Patent Document 1 is used in combination with a seismic isolation bearing to form a seismic isolation device, and is designed to absorb and attenuate the energy of shaking during an earthquake in order to suppress relative displacement between the foundation and the building during an earthquake. Furthermore, in the seismic isolation damper device disclosed in Patent Document 1, when the displacement of the first piston reaches a predetermined value, hydraulic pressure is introduced from within the second hydraulic cylinder to the back side of the spring seat of the damping valve, increasing the spring force of the spring that biases the valve body that opens and closes the communication passage that communicates with the first hydraulic cylinder, thereby increasing the damping force and varying the damping performance in accordance with the stroke of the first piston rod caused by seismic motion. However, since further improvements have been desired, the applicant of the present application has proposed, for example, in Patent Document 2, an oil damper system aimed at improving seismic isolation damper devices using an oil damper that varies the damping performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4442770 [Patent Document 2] Japanese Patent Publication No. 2022-173788 Summary of the Invention [Problem to be solved by the invention]

[0005] In the oil damper system of Patent Document 2, the seismic isolation damper device is equipped with a damper performance variable mechanism including a transmission rod-shaped member attached to the end of the piston rod that moves the piston and transmitting the extension / contraction stroke of the piston rod, and a pair of control cylinder units each arranged along the direction of the extension / contraction stroke of the piston rod and filled with control oil, and each having a control piston that discharges the control oil in the cylinder case from a discharge port when the control piston rod extends, and when an excess extension stroke or excess contraction stroke exceeding a predetermined extension stroke occurs in the piston rod, the transmission rod-shaped member extends the control piston rod by this excess extension stroke or excess contraction stroke, thereby discharging control oil from the discharge port, and one end of the transmission rod-shaped member is connected to the tip of the piston rod and is a long rod-shaped transmission member that transmits the extension / contraction stroke of the piston rod to the control piston rod of the control cylinder unit.

[0006] Furthermore, in the seismic isolation damper device described in Patent Document 2, the above-mentioned transmission rod-shaped member is preferably attached to the piston rod via a spherical plain bearing, thereby improving the attachment structure of the transmission rod-shaped member to the piston rod, and by preventing torsional deformation in particular, it is possible to reliably transmit the extension / contraction stroke amount of the piston rod to a pair of control cylinder units of the damper performance variable mechanism by the long transmission rod-shaped member.

[0007] On the other hand, in the seismic isolation damper device described in Patent Document 2, the both ends are connected to a foundation structure that is integrated with the foundation ground or a building supported by seismic isolation bearings, and the seismic isolation damper device is installed between them.The connecting section structure is formed by, for example, arranging a clevis that protrudes from an end metal fitting attached to the end of the piston rod of the damper device in the space between a pair of upper and lower support plate portions of a connecting bracket attached to the foundation structure or building, and fitting a shaft pin while aligning the fitting holes and through holes formed in the support plate portion and the clevis.

[0008] Furthermore, when a clevis projecting from the end hardware is inserted into the space between the pair of upper and lower support plates of the connecting bracket, the thickness of the clevis on the end hardware is made considerably thinner than the gap between the pair of upper and lower support plates of the connecting bracket, taking into consideration ease of insertion at the installation site and other workability. Furthermore, the clevis is arranged in the middle of the space between the pair of upper and lower support plates, spaced apart from these support plates by the interposition of a spacer member, and a spherical plain bearing is preferably provided in the through hole of the clevis, allowing a certain degree of tilting in the gap between the pair of upper and lower support plates of the connecting bracket, so that any twisting of the piston rod that occurs during an earthquake, for example, can be absorbed.

[0009] However, in the seismic isolation damper device described in Patent Document 2, tilting of the clevis is permitted in the gap between the pair of upper and lower support plates. However, if, for example, unexpected biased stress occurs during an earthquake and the clevis tilts excessively, a large torsional deformation occurs in the long transmission rod member, the base end of which is joined to the end of the piston rod, preferably via an end metal fitting, and this may interfere with the transmission of the extension / retraction stroke of the piston rod to the control cylinder unit, which is transmitted via the transmission rod member as the piston rod extends / retracts. Therefore, there is a need for the development of a technology that, while taking into consideration the ease of installation at the installation site, can avoid excessive tilting of the clevis even when unexpected biased stress occurs during an earthquake, and prevent interference with the transmission of the extension / retraction stroke of the piston rod to the control cylinder unit, which is transmitted via the transmission rod member as the piston rod extends / retracts.

[0010] The present invention aims to provide a connection structure for a seismic isolation damper device that can prevent excessive tilting of the clevis even when unexpected biased stress occurs, for example, during an earthquake, and that does not interfere with the transmission of the extension and contraction stroke amount of the piston rod to the control cylinder unit, which is transmitted via a transmission rod-shaped member as the piston rod extends and contracts. [Means for solving the problem]

[0011] The present invention provides a connection structure for a seismic isolation damper device for connecting and attaching an end of a piston rod of a seismic isolation damper device that is disposed between a foundation structure integrated with the foundation ground and a building supported by seismic isolation bearings installed on the foundation structure, and that suppresses relative displacement between the foundation structure and the building during an earthquake and absorbs and attenuates energy due to shaking during an earthquake, to at least one of mounting brackets that are fixed integrally to the foundation structure and the building, respectively, wherein the mounting bracket comprises a base portion and a support plate portion that is provided so as to protrude laterally from the base portion in parallel and has a pair of upper and lower spaced apart mounting holes, and the end of the piston rod that constitutes the seismic isolation damper device has a clevis that is attached to the inside of a circular through-hole and has a spherical plain bearing, and the upper and lower mounting brackets are fixed to the end of the piston rod of the seismic isolation damper device. The end of the piston rod of the seismic isolation damper device is connected to the mounting bracket by fitting a shaft pin into the matching mounting hole and through hole in the space between the pair of support plate portions, with the clevis being fitted in the space between the pair of support plate portions by aligning the through hole with the fitting hole, and the clevis is positioned in the middle of the space between the pair of upper and lower support plate portions by interposing a metal spacer member between the clevis and the upper surface of the support plate portion below the mounting bracket, and the spacer member has a shape in which a circular support portion that abuts and supports the lower end of the inner ring of the spherical plain bearing provided on the clevis protrudes at a predetermined height from the upper surface of a base plate of a predetermined thickness, thereby achieving the above object.

[0012] Furthermore, it is preferable that the connecting portion structure of the seismic isolation damper device of the present invention is such that the spacer member has a band-shaped convex portion extending on both sides along the diameter of the circular support portion in the outer region of the circular support portion, protruding from the upper surface of the base plate at a height lower than the protruding height of the circular support portion.

[0013] In addition, in the connecting portion structure of the seismic isolation damper device of the present invention, it is preferable that the band-shaped convex portion is provided so as to extend in a direction perpendicular to the axial direction of the piston rod.

[0014] Furthermore, in the connecting portion structure of the seismic isolation damper device of the present invention, the upper surface of the belt-shaped convex portion is preferably lower than the upper surface of the circular support portion by 1.0 to 2.0 mm.

[0015] Furthermore, in the connecting portion structure of the seismic isolation damper device of the present invention, the circular support portion is preferably provided so as to protrude from the upper surface of the base plate by a protrusion height of 3.0 to 4.0 mm.

[0016] Furthermore, the connecting section structure of the seismic isolation damper device of the present invention is preferably such that the seismic isolation damper device is equipped with a damper performance variable mechanism including a pair of control cylinder units having a transmission rod-shaped member that transmits the extension / contraction stroke amount of the piston rod, cylinder cases that are each arranged along the direction of the extension / contraction stroke of the piston rod and filled with control oil, and control pistons that discharge the control oil in the cylinder cases from a discharge port when the control piston rod is extended, and when an excess extension stroke amount or excess contraction stroke amount that exceeds a predetermined extension / contraction stroke amount occurs in the piston rod, the transmission rod-shaped member extends the control piston rod by this excess extension stroke amount or excess contraction stroke amount, thereby discharging control oil from the discharge port, and it is preferable that the transmission rod-shaped member is a long rod-shaped transmission member having one end connected to the tip of the piston rod and transmitting the extension / contraction stroke amount of the piston rod to the control piston rod of the cylinder unit. [Effects of the Invention]

[0017] According to the connection structure of the seismic isolation damper device of the present invention, even if unexpected biased stress occurs during an earthquake, excessive tilting of the clevis can be avoided, and the transmission of the extension / retraction stroke amount of the piston rod to the control cylinder unit, which is transmitted via the transmission rod-shaped member as the piston rod extends and retracts, can be prevented from being hindered. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an explanatory diagram illustrating a hydraulic circuit of an oil damper system using a seismic isolation damper device installed via the connecting portion structure of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view illustrating a pressure regulating valve unit provided in the oil damper system of FIG. [Figure 3] FIG. 2 is a cross-sectional view illustrating a control cylinder unit provided in the oil damper system of FIG. 1. [Figure 4] 1 is a schematic plan view illustrating a seismic isolation damper device installed between a foundation structure and a building via a connecting portion structure of the present invention. [Figure 5] 1 is a schematic top view illustrating a seismic isolation damper device installed between a foundation structure and a building via a connecting portion structure of the present invention. FIG. [Figure 6] 5. (a) is an enlarged schematic plan view of part A in FIG. 4, and (b) is an enlarged schematic top view of part A in FIG. [Figure 7] 1 is an enlarged cross-sectional view illustrating a portion of a connecting portion structure of a seismic isolation damper device according to a preferred embodiment of the present invention. [Figure 8] 10A is a top view illustrating the spacer member, FIG. 10B is a cross-sectional view taken along line BB in FIG. 10A, and FIG. 10C is a side view of FIG. 10A viewed from the left side. [Figure 9] FIG. 2 is a perspective view illustrating a spherical plain bearing. DETAILED DESCRIPTION OF THE INVENTION

[0019] A connection structure 40 (see FIG. 7) of a seismic isolation damper device according to a preferred embodiment of the present invention is employed in an oil damper system 1 mainly composed of a seismic isolation damper device 4, such as a uniflow oil damper, as shown in FIG. 1, as a structure for connecting an end of a piston rod 9, which is one end of the seismic isolation damper device 4, to a mounting bracket 41 fixed integrally to, for example, a building 3, as shown in FIGS. 4 and 5.

[0020] In this embodiment, the oil damper system 1 is used by being placed between the vibration input side and the vibration damping target side, for example, between a foundation structure 2 that moves integrally with the foundation ground and a building 3 constructed on top of the foundation structure 2 and supported by seismic isolation bearings (not shown).

[0021] The seismic isolation damper device 4, which is preferably a uniflow type oil damper and which constitutes the oil damper system 1 shown in FIG. 1, is a known damper device, and comprises an outer cylinder 5, a hydraulic oil reservoir 6 provided inside the outer cylinder 5 and storing hydraulic oil F while maintaining a free surface, an inner cylinder 7 provided inside the outer cylinder 5, a piston 8 provided inside the inner cylinder 7 so as to slide freely in a liquid-tight state and which divides the inside of the inner cylinder 7 into a first hydraulic chamber R1 and a second hydraulic chamber R2, and a piston 8 integrally connected to the piston 8, which passes through the inner cylinder 7 and extends to the outer The hydraulic pressure regulator includes a piston rod 9 that protrudes fluid-tightly outward from the cylinder 5 and operates slidably; a pressure regulating valve unit 10 that is provided between the first hydraulic chamber R1 and the hydraulic oil reservoir 6 and that produces an energy absorbing effect; a first damper check valve 11 that is provided between the hydraulic oil reservoir 6 and the second hydraulic chamber R2 and that allows hydraulic oil F to flow only from the hydraulic oil reservoir 6 toward the second hydraulic chamber R2 and blocks backflow; and a second damper check valve 12 that is provided on the piston 8 and that allows hydraulic oil F to flow only from the second hydraulic chamber R2 toward the first hydraulic chamber R1 and blocks backflow.

[0022] The pressure-receiving area of ​​the piston 8 on the side of the first hydraulic chamber R1 to which the piston rod 9 is connected is set to be half of that on the side of the second hydraulic chamber R2.

[0023] 2, the pressure regulating valve unit 10 includes a valve body 13 having a hydraulic oil inlet port P1 communicating with the first hydraulic chamber R1 of the inner cylinder 7 and a hydraulic oil outlet port P2 communicating with the hydraulic oil reservoir 6, a valve element 14 movably provided within the valve body 13 and opening and closing the hydraulic oil inlet port P1 by movement, a spring seat 15 disposed within the valve body 13 on the opposite side from the valve element 14 and movably provided in a liquid-tight manner relative to the valve body 13, and a pressure regulating spring 16 disposed between the spring seat 15 and the valve element 14 and supported by the spring seat 15 to bias the valve element 14. That is, within the valve body 13, the valve element 14 is disposed at one end of the pressure regulating spring 16, and the spring seat 15 is disposed at the other end of the pressure regulating spring 16.

[0024] In the pressure regulating valve unit 10, the pressure regulating spring 16 biases the valve element 14 toward the hydraulic oil inlet port P1, and the biasing force of the pressure regulating spring 16 causes the valve element 14 to close the hydraulic oil inlet port P1, thereby isolating the first hydraulic chamber R1 from the hydraulic oil reservoir 6. When the valve element 14 opens the hydraulic oil inlet port P1 against the biasing force of the pressure regulating spring 16, the hydraulic oil inlet port P1 and the hydraulic oil outlet port P2 are communicated with each other, thereby communicating the first hydraulic chamber R1 with the hydraulic oil reservoir 6. The valve body 13 of the pressure regulating valve unit 10 is further provided with an introduction port P3, which will be described later, facing the back surface of the spring seat 15 (the side opposite to the side where the pressure regulating spring 16 is installed).

[0025] In operation of the seismic isolation damper device 4 using a uniflow oil damper, when the piston rod 9 is pulled out from the outer cylinder 5 in the extension direction and the piston 8 moves to narrow the first hydraulic chamber R1 of the inner cylinder 7, hydraulic oil F flows out from the first hydraulic chamber R1 toward the pressure regulating valve unit 10. In addition, the outflow pressure of the hydraulic oil F flowing out of the first hydraulic chamber R1 acts on the hydraulic oil inflow port P1, causing the valve element 14, which is biased by the pressure regulating spring 16, to move against the spring force of the pressure regulating spring 16 and open the hydraulic oil inflow port P1.

[0026] When the hydraulic oil inlet port P1 is opened, the hydraulic oil F flows through the valve body 13 of the pressure regulating valve unit 10, through the gap between the inner surface of the valve body 13 and the valve element 14, toward the hydraulic oil outlet port P2, and then flows out from the hydraulic oil outlet port P2 toward the hydraulic oil reservoir 6.

[0027] The opening operation of the valve element 14 caused by the outflow pressure of the hydraulic oil F from the first hydraulic chamber R1 is restricted by the pressure adjusting spring 16, and the energy absorbing function of the oil damper 4 is thereby exerted.

[0028] In addition, when the first hydraulic chamber R1 is narrowed and hydraulic oil F flows out of the first hydraulic chamber R1, the hydraulic oil F flows into the expanded second hydraulic chamber R2 from the hydraulic oil reservoir 6 through the first damper check valve 11.

[0029] On the other hand, when the piston rod 9 is retracted toward the outer cylinder 5 and the piston 8 moves to expand the first hydraulic chamber R1 of the inner cylinder 7, thereby narrowing the second hydraulic chamber R2, the first damper check valve 11 is closed, and as described above, the pressure-receiving area of ​​the piston 8 on the second hydraulic chamber R2 side is twice that on the first hydraulic chamber R1 side. Therefore, the hydraulic oil F in the second hydraulic chamber R2, whose pressure has increased, is sent to the first hydraulic chamber R1 through the second damper check valve 12 of the piston 8 at twice the amount when the piston rod 9 was extended, and half of that amount of hydraulic oil F is further pushed out of the first hydraulic chamber R1 and flows out toward the pressure regulating valve unit 10. In the first hydraulic chamber R1, the double amount of hydraulic oil F flows in from the second hydraulic chamber R2, and half of that amount is replenished with hydraulic oil F, so that the first hydraulic chamber R1 is always filled.

[0030] During the contraction of the piston rod 9, as during the extension, the outflow pressure of the hydraulic oil F flowing out of the first hydraulic chamber R1 acts on the hydraulic oil inlet port P1, moving the valve body 14, which is biased by the pressure regulating spring 16, against the spring force of the pressure regulating spring 16, thereby opening the hydraulic oil inlet port P1.

[0031] When the hydraulic oil inlet port P1 is opened, the hydraulic oil F flows through the valve body 13 of the pressure regulating valve unit 10 toward the hydraulic oil outlet port P2 and then flows out from the hydraulic oil outlet port P2 toward the hydraulic oil reservoir 6. When the piston rod 9 contracts, as when it extends, the opening movement of the valve element 14 due to the outflow pressure of the hydraulic oil F from the first hydraulic chamber R1 is limited by the pressure regulating spring 16, thereby allowing the energy absorption function of the oil damper 4 to be exerted. Whether the piston rod 9 is extending or retracting, if the sliding distance of the piston 8 is the same, the amount of hydraulic oil F flowing into the pressure regulating valve unit 10 is the same, and therefore the amount of energy absorption is the same.

[0032] In this way, in the seismic isolation damper device 4 using a uniflow type oil damper, the hydraulic oil F flows in one direction, flowing out only from the first hydraulic chamber R1 and flowing into only the first hydraulic chamber R1.

[0033] A relief valve 17 is provided between the first hydraulic chamber R1 and the hydraulic oil reservoir 6 to release the hydraulic pressure of the hydraulic oil F in the first hydraulic chamber R1 when the piston rod 9 operates at high speed.

[0034] In this embodiment, the seismic isolation damper device 4 is a uniflow oil damper, and the outer cylinder 5 is connected to, for example, a foundation 2 that moves integrally with the foundation ground as one of the vibration input side and the vibration damping side, and the piston rod 9 is connected to, for example, a building 3 supported by a seismic isolation bearing (not shown) as the other of the vibration input side and the vibration damping side. When a relative displacement occurs between the foundation 2 and the building 3 due to an earthquake, the seismic isolation damper device 4 is designed so that the piston rod 9 performs an extension / contraction stroke by an amount corresponding to the amount of relative displacement.

[0035] In this embodiment, the seismic isolation damper device 4 using a uniflow oil damper is provided with a transmission rod-shaped member 18 that transmits the extension / contraction stroke of the piston rod 9 that moves the piston 8, as shown in FIGS. 1 to 3. The transmission rod-shaped member 18 is formed as a long rod-shaped transmission member that is elongated in the extension / contraction stroke direction of the piston rod 9. The transmission rod-shaped member 18 has a base end 18a, which is one end in the length direction, attached to the piston rod 9 by an attachment structure that will be described later, and a tip end 18b, which is the other end in the length direction, supported on the outer periphery of the outer cylinder 5 so as to be slidable.

[0036] The transmission rod-shaped member 18, whose base end 18a is attached to the piston rod 9, is able to slide in the extension / contraction direction on the outer periphery of the seismic isolation damper device 4 in accordance with the extension / contraction movement of the piston rod 9. When the piston rod 9 performs an extension stroke, the tip end 18b moves in the extension stroke direction by the same amount, and when the piston rod 9 performs a contraction stroke, the tip end 18b moves in the contraction stroke direction by the same amount.

[0037] Furthermore, a pair of control cylinder units 19, 19 are provided on both sides of the tip 18b of the transmission rod member 18 at the outer peripheral portion of the outer cylinder 5 of the seismic isolation damper device 4, along the extension stroke direction of the piston rod 9. One of these control cylinder units 19, 19 is provided to operate in response to the extension stroke of the piston rod 9, and the other control cylinder unit 19 is provided to operate in response to the contraction stroke.

[0038] 3, each of these control cylinder units 19, 19 includes a cylinder case 20 filled with control oil f, a control piston 21 slidably mounted in the cylinder case 20 in a liquid-tight manner, a control piston rod 22 connected at one end to the piston 21 and slidably projecting at the other end outward from the cylinder case 20 in a liquid-tight manner to extend and retract the control cylinder unit 19, a spring 23 mounted in the cylinder case 20 to bias the control piston 21 in the direction of retraction of the control piston rod 22, and a discharge port P4 mounted in the cylinder case 20 to discharge pressurized control oil f from the cylinder case 20 by the control piston 21 sliding as the control piston rod 22 extends against the spring 23. The spring 23 is set to exert a weak spring force that slowly retracts the control piston rod 22. If the spring force of the pressure adjusting spring 16 is large and the control oil f can be discharged naturally after the earthquake ends, the spring 23 may be omitted.

[0039] Furthermore, an operating portion 24 (see FIG. 1) is provided at the tip 18b of the transmission rod member 18, and a passive portion 25 is provided at the protruding tip of each control piston rod 22 of a pair of control cylinder units 19 arranged on both sides of the tip 18b of the transmission rod member 18, with which the operating portion 24 of the transmission rod member 18 can be freely disengaged. The pair of control cylinder units 19 are installed on the outer circumferential portion of the outer cylinder 5 of the seismic isolation damper device 4 so that the extension directions of the control piston rods 22 are diametrically opposite each other and so that the operating portion 24 of the tip 18b of the transmission rod member 18 is located between the passive portions 25 in the extension stroke direction of the piston rod 9, as shown in FIG.

[0040] Furthermore, when the seismic isolation damper device 4 using a uniflow oil damper is in an inoperative state, the piston rod 9 is in a neutral position N in the extension / retraction stroke direction, and the control piston rods 22 of the pair of control cylinder units 19 are contracted by the biasing force of the springs 23, the passive parts 25 of these control cylinder units 19 are arranged at positions spaced apart from the operating part 24 by a predetermined extension / retraction stroke amount S set for the piston rod 9. In other words, the operating part 24 and each passive part 25 are arranged at positions spaced apart by the same distance as the predetermined extension / retraction stroke amount S of the piston rod 9.

[0041] As a result, when the piston rod 9 performs an extension stroke within the range of the predetermined extension stroke amount S, the operating part 24 of the tip 18b of the transmission rod-shaped member 18 moves accordingly, but does not engage with the passive part 25 of any of the control cylinder units 19, so the control cylinder units 19 do not operate.

[0042] On the other hand, when the piston rod 9 experiences an excessive extension stroke that exceeds the predetermined extension stroke amount S, for example, an excessive extension stroke, the operating part 24 engages with the passive part 25 of the control piston rod 22 of one of the control cylinder units 19, and the passive part 25 engaged by the operating part 24 extends the control piston rod 22 by an excessive extension stroke amount that exceeds the predetermined extension stroke amount S. In addition, the extended control piston rod 22 causes the control piston 21 to slide against the spring 23, and control oil f is discharged from the discharge port P4 of the cylinder case 20 by an amount equivalent to the excessive extension stroke amount.

[0043] When the piston rod 9, which repeats extension and contraction strokes, transitions to a contraction stroke, the operating part 24 at the tip 18b of the transmission rod-shaped member 18 can disengage from the passive part 25, which has been engaging to extend the control piston rod 22.

[0044] If the excess extension stroke amount, which exceeds the specified extension stroke amount S, caused by the second extension stroke of the piston rod 9 is equivalent to the previous excess extension stroke amount, the control piston rod 22, which had been extending during that time, is pushed very slowly in the contraction direction by the spring 23, which has a weak spring force, and remains in approximately the same position, so that control oil f is not discharged. On the other hand, if the excess extension stroke amount exceeds the previous excess extension stroke, the operating part 24 engages with the passive part 25 again, and the control piston rod 22 is extended again by the increased excess extension stroke amount, so that control oil f is discharged from the control cylinder unit 19 in an amount equivalent to the increased excess extension stroke.

[0045] Furthermore, when an excessive contraction stroke that exceeds the predetermined extension stroke amount S occurs in the piston rod 9, the operating portion 24 of the tip portion 18b of the transmission rod-shaped member 18 causes the control piston rod 22 of the other control cylinder unit 19 to extend in the same manner as in the case of the above-mentioned excessive extension stroke, and control oil f for the excessive contraction stroke is discharged from the discharge port P4 of the cylinder case 20, and also control oil f for the increased excessive contraction stroke.

[0046] In this way, when the extension / contraction stroke amount of the piston rod 9 of the seismic isolation damper device 4 using a uniflow oil damper exceeds a predetermined extension / contraction stroke amount S, the control cylinder units 19, 19 first discharge control oil f in an amount corresponding to the excess extension / contraction stroke amount when the predetermined extension / contraction stroke amount S is exceeded, and thereafter repeat this process of discharging control oil f in an amount corresponding to the excess extension / contraction stroke amount that exceeds the previous excess extension / contraction stroke. In other words, after exceeding the predetermined extension / contraction stroke amount S, each time the excess extension / contraction stroke amount increases, the pair of control cylinder units 19, 19 will both discharge control oil f in an amount corresponding to the increase in the amount of movement.

[0047] The control piston rod 22 of the control cylinder units 19, 19 that are being extended is slowly urged in the contraction direction by the spring 23 and returned to its original position when, for example, an earthquake subsides and the seismic isolation damper device 4 has ceased operation and is in a non-operating state (when the piston rod 9 returns to the neutral position N in the extension stroke direction). However, since the spring force of the spring 23 is weakened, while the seismic isolation damper device 4 is in operation, the control piston rod 22 is extended by the operating part 24 of the tip 18b of the transmission rod-shaped member 18, thereby maintaining the extended position of the control piston rod 22 that is pulled out from the cylinder case 20. Therefore, the action of the spring 23 makes it possible to prevent the discharged control oil f from flowing towards the discharge port P4.

[0048] 1, a control oil distribution system 26 is provided between the pair of control cylinder units 19 and the pressure regulating valve unit 10. The control oil distribution system 26 is configured as a piping system and has a communication part 27 that connects the discharge ports P4 of the pair of control cylinder units 19, and also connects the communication part 27 to the inlet port P3 of the pressure regulating valve unit 10. The control oil distribution system 26 is also provided with a check valve 28 disposed between the communication part 27 and the inlet port P3 of the pressure regulating valve unit 10. The check valve 28 allows the control oil f to flow from the communication part 27 toward the inlet port P3 and prevents backflow.

[0049] The control oil f flowing from the inlet port P3 into the valve body 13 of the pressure regulating valve unit 10 generates hydraulic pressure on the back surface of the spring seat 15 (see FIG. 2), and the generated hydraulic pressure acts as back pressure on the check valve 28. That is, in the control oil circulation system 26 equipped with the check valve 28, the control oil f discharged from each discharge port P4, P4 flows back and forth between the pair of discharge ports P4, P4, or passes through the check valve 28 and the inlet port P3 to flow to the back surface of the spring seat 15 in the pressure regulating valve unit 10, generating hydraulic pressure on the back surface of the spring seat 15 that changes the spring force of the pressure regulating spring 16.

[0050] The piston rod 9 of the seismic isolation damper device 4, which is a uniflow oil damper, repeatedly extends and retracts alternately, which normally causes the control piston rods 22, 22 of the pair of control cylinder units 19, 19 to also extend alternately, and control oil f is alternately and intermittently discharged from each discharge port P4, P4. The check valve 28 introduces the control oil f into the inlet port P3 when the hydraulic pressure of the control oil f discharged from the discharge port P4 of either control cylinder unit 19 during extension and acting through the communication part 27 exceeds its valve opening pressure (the force with which the pressure adjustment spring 16, compressed by the control oil f flowing into the pressure adjustment valve unit 10, pushes back against the spring seat 15), and prevents the control oil f from flowing into the inlet port P3 when the hydraulic pressure of the control oil f is below the valve opening pressure. The control oil f, the flow of which is blocked by the check valve 28, flows through the communication portion 27 into the discharge port P4 of the other control cylinder unit 19, which is not undergoing the expansion operation.

[0051] When an excessive extension stroke and an excessive retraction stroke occur, and the pair of control cylinder units 19, 19 are alternately extended as these stroke amounts increase, the hydraulic pressure of the control oil f generated by these units repeatedly acts on the check valve 28, and the check valve 28 causes the control oil f to flow into the inlet port P3 of the pressure regulating valve unit 10 each time the valve opening pressure is exceeded. As a result, within the valve body 13 of the pressure regulating valve unit 10, the control oil f is introduced from the inlet port P3 to the back surface of the spring seat 15, and the amount of control oil f gradually increases, causing the pressure regulating spring 16 to gradually contract between itself and the valve disc 14, and this contraction causes the spring force of the pressure regulating spring 16 that biases the valve disc 14 to change and increase.

[0052] In other words, the spring seat 15 moves to compress the pressure regulating spring 16 due to the hydraulic pressure of the control oil f introduced from the inlet port P3, thereby causing the spring force of the pressure regulating spring 16 to change in accordance with the amount of excess extension stroke or excess contraction stroke.

[0053] In addition, as shown in FIG. 1, the control oil circulation system 26 is provided with a bypass path 29 that bypasses the check valve 28 in order to return the control oil f to the pair of control cylinder units 19, 19, and this bypass path 29 is provided with a return valve (e.g., a needle valve) 30 in parallel with the check valve 28, which has a throttling function that can be freely opened and closed and has an adjustable opening.

[0054] This return valve 30 is configured to sequentially return the control oil f that has been sent to the pressure regulating valve unit 10 from the inlet port P3 through the communication part 27 to the discharge ports P4, P4 of the pair of control cylinder units 19, 19, for example, when an earthquake has subsided and the seismic isolation damper device 4 has finished operating and is in a deactivated state (when the piston rod 9 has returned to the neutral position N in the extension / contraction stroke direction). In addition, while the seismic isolation damper device 4 is in operation, the return valve 30 is configured to restrict the outflow of control oil f from the back surface of the spring seat 15. In Figure 1, reference numeral 32 denotes an air bleed plug for the control oil f.

[0055] Next, we will explain the operation of the oil damper system 1. The seismic isolation damper device 4, which is a uniflow type oil damper, is set between the foundation structure 2 and the building 3 so that the piston rod 9 is in the neutral position N in the extension stroke direction.

[0056] For example, when an earthquake occurs and the seismic isolation damper device 4 is activated, the pair of control cylinder units 19, 19 will not operate as long as there is no excessive extension stroke or excessive contraction stroke in the extension stroke of the piston rod 9, and the seismic isolation damper device 4 absorbs the earthquake energy by the valve element 14 of the pressure regulating valve unit 10 opening and closing in response to the outflow pressure of the hydraulic oil F with the initial spring characteristics set in the pressure regulating spring 16. Furthermore, when an excessive extension stroke amount that exceeds the predetermined extension stroke amount S occurs in the piston rod 9, the control cylinder units 19, 19 will be activated via the operating part 24 of the tip 18b of the transmission rod-shaped member 18.

[0057] Furthermore, when the control piston rod 22 of one of the control cylinder units 19 is extended by either the initial excessive extension stroke or excessive contraction stroke, and the control oil f is introduced from the discharge port P4 through the check valve 28 to the back side of the spring seat 15 of the pressure regulating valve unit 10, the pressure regulating spring 16 is compressed, and the pressure regulating valve unit 10 opens and closes the valve body 14 against the outflow pressure of the hydraulic oil F due to the spring characteristics of the pressure regulating spring 16, which have been changed to a spring force greater than the initial spring characteristics, thereby increasing the absorption of earthquake energy.

[0058] When the newly generated excess extension / contraction stroke is within the initial excess extension / contraction stroke amount and no excess extension / contraction stroke beyond that amount occurs, even if the pair of control piston rods 22, 22 are extended via the transmission rod-shaped member 18, the check valve 28 remains closed, and the control oil f discharged from the pair of control cylinder units 19, 19 flows back and forth between the discharge ports P4, P4 of these control cylinder units 19, 19 through the communication part 27 of the control oil circulation system 26.

[0059] Furthermore, each time an excess extension stroke or excess contraction stroke occurs that exceeds the previous excess extension stroke, the check valve 28 is opened by the oil pressure of the control oil f discharged from the pair of control cylinder units 19, 19, and each time the control oil f is introduced into the pressure regulating valve unit 10, the spring force of the pressure regulating spring 16 is changed by an increasingly large amount.

[0060] Therefore, the larger the extension / contraction stroke of the piston rod 9 caused by an earthquake, the greater the spring force of the pressure adjustment spring 16 of the pressure adjustment valve unit 10 can be made to change the energy absorption performance to a greater extent.

[0061] That is, in this embodiment, the seismic isolation damper device 4 is equipped with a damper performance variable mechanism 33 including a transmission rod-shaped member 18 that transmits the extension / contraction stroke amount of the piston rod 9, cylinder cases 20 that are each provided along the extension / contraction stroke direction of the piston rod 9 and filled with control oil, and a pair of control cylinder units 19 that have control pistons 21 that discharge the control oil f in the cylinder cases 20 from a discharge port P4 when the control piston rods 22 extend, and when an excess extension stroke amount or excess contraction stroke amount exceeding a predetermined extension / contraction stroke amount S occurs in the piston rod 9, the transmission member 18 extends the control piston rods 22 by the excess extension stroke amount or excess contraction stroke amount, thereby discharging the control oil f from the discharge port P4. The transmission rod member 18 is a long rod-shaped transmission member having one end connected to the tip of the piston rod 9 and transmitting the extension / contraction stroke amount of the piston rod 9 to the control piston rods 22 of the control cylinder units 19.

[0062] 6(a), the attachment state of the base end 18a of the transmission rod member 18 to the piston rod 9 will be described. An end hardware 38 is threadedly attached to the tip end 9a of the piston rod 9 in the extension stroke direction. A mounting seat 35 is provided on the attachment base 38a of the end hardware 38, extending upward from the outer periphery. A spherical plain bearing hardware 36 is provided on the upper end of the mounting seat 35, and the base end 18a of the transmission rod member 18 is detachably connected via this spherical plain bearing hardware 36. Therefore, the base end 18a of the transmission rod member 18 is attached to the end of the piston rod 9 via the spherical plain bearing hardware 36 and the mounting seat 35.

[0063] The spherical plain bearing hardware 36 is a well-known hardware configured by surrounding a sphere with a spherical seat, and is designed to transmit force to the transmission rod member 18 only in the extension / retraction stroke direction of the piston rod 9, and to cushion and absorb various movements of the piston rod 9 relative to the transmission rod member 18 so that loads are not applied from other directions. Furthermore, when an excessive load is applied between the base end 18a of the transmission rod member 18 and the spherical plain bearing hardware 36, the transmission rod member 18 will detach from the spherical plain bearing hardware 36, and its attachment to the piston rod 9 will be released.

[0064] As a result, even if unexpected biased stress due to twisting or the like occurs between the piston rod 9 of the seismic isolation damper device 4 and the outer cylinder 5 due to fluctuations during an earthquake, for example, it is possible to effectively prevent damage to the long transmission rod-shaped member 18, and it is also possible to ensure that the extension and contraction stroke of the piston rod 9 is properly transmitted to the control cylinder unit 19 via the transmission rod-shaped member 18.

[0065] In this embodiment, in addition to the above-mentioned configuration, as will be described later, the structure of the mounting portion 37 for connecting the end portion (tip portion in the extension stroke direction) 9a of the piston rod 9, which is one end portion of the seismic isolation damper device 4, to a mounting bracket 41 fixed integrally to, for example, the building 3, is improved so that the tiltable angle range of the clevis 42 (described later) attached to the end portion 9a of the piston rod 9, which is preferably arranged in the space between a pair of upper and lower support plate portions 41a of the mounting bracket 41, can be restricted with a simple configuration. This makes it possible to prevent the clevis 42 from tilting excessively even if unexpected biased stress due to torsion or the like occurs between the piston rod 9 of the seismic isolation damper device 4 and the outer cylinder 5 during an earthquake, for example, and more effectively prevents interference with the transmission of the extension / contraction stroke amount of the piston rod 9 to the control cylinder unit 19 via the transmission rod-shaped member 18 as the piston rod 9 extends or contracts.

[0066] That is, as shown in FIGS. 4 to 7 , the connection structure 40 of a seismic isolation damper device according to a preferred embodiment of the present invention is a structure of a mounting part 37 for connecting and mounting an end (tip in the extension stroke direction) 9 a of a piston rod 9 of a seismic isolation damper device 4 that is disposed between a foundation 2 integrated with the foundation ground and a building 3 supported by a seismic isolation bearing (not shown) installed on the foundation 2, and that suppresses relative displacement between the foundation 2 and the building 3 during an earthquake and absorbs and attenuates energy due to shaking during an earthquake, to at least one of mounting brackets 41 fixed integrally to the foundation 2 and the building 3 (in this embodiment, the mounting bracket to the building 3), and the mounting bracket 41 is fixed integrally to the base part 4 The base portion 41b includes a base plate portion 41b and a support plate portion 41a having a pair of spaced-apart mounting holes 41c that extend laterally in parallel from the base portion 41b. A clevis 42 having a spherical plain bearing 44 inside a circular through-hole 42a is attached to the end portion 9a of the piston rod 9 that constitutes the seismic isolation damper device 4. The clevis 42 is attached in the space between the pair of upper and lower support plate portions 41a of the mounting bracket 41 by aligning the through-hole 42a with the mounting hole 41c, and then a shaft pin 43 is attached so as to fit into the aligned mounting hole 41c and through-hole 42a, thereby connecting the end portion 9a of the piston rod 9 of the seismic isolation damper device 4 to the mounting bracket 41. The clevis 42 is positioned in the middle of the space between the pair of upper and lower support plate portions 41a by interposing a metal spacer member 45 between the clevis 42 and the upper surface of the lower support plate portion 41a of the mounting bracket 41. As shown in Figures 6(a) and (b), the spacer member 45 has a shape in which a circular support portion 45b that abuts and supports the lower end of the inner ring 44a of the spherical plain bearing 44 (see Figure 9) provided in the clevis 42 protrudes at a predetermined height from the upper surface of a base plate 45a of a predetermined thickness.

[0067] In this embodiment, the spacer member 45 is provided with band-shaped protrusions 45c, which extend on both sides of the circular support portion 45b in the diameter direction, preferably in the outer region of the circular support portion 45b, and protrude from the upper surface of the base plate 45a at a height lower than the protruding height of the circular support portion 45b. The band-shaped protrusions 45c preferably extend in a direction perpendicular to the axial direction X of the piston rod 9 (see FIG. 6(b)).

[0068] 6(a) and 6(b), the mounting bracket 41 constituting the connecting structure 40 is a known metal hardware member, and includes a base portion 41b in the shape of a thick metal plate, which is arranged, for example, vertically and fixed to the building 3, and a pair of upper and lower support plates 41a, which are formed integrally with the base portion 41b and extend parallel to each other in the horizontal direction, and have, for example, semi-elliptical planar shapes, and are arranged at an interval of, for example, 95 mm. Furthermore, a fitting hole 41c having an inner diameter of, for example, about 75 mm is formed in the center of the protruding tip of each support plate portion 41a, penetrating the top and bottom in the vertical direction and opening therethrough, into which a shaft pin 43 is fitted.

[0069] The clevis 42 attached to the space (gap) between the pair of upper and lower support plate portions 41a of the mounting bracket 41 is a known component forming the end connection portion of a seismic isolation damper device, and is formed integrally with the end metal fitting 38 so as to protrude from the end metal fitting 38, which is threadedly connected to the end portion 9a in the extension stroke direction of the piston rod 9 to which the base end portion 18a of the transmission rod member 18 is attached, toward the end side in the axial direction X of the piston rod 9. The clevis 42 is a disk-shaped portion having a thickness of about 64 mm, which is thinner than the gap between the pair of upper and lower support plate portions 41a of the mounting bracket 41. The clevis 42 has a through hole 42a, which has an inner diameter of, for example, about 100 mm, formed through its center, and inside the through hole 42a is attached a spherical plain bearing 44 having an inner ring 44a with an inner through hole 44c having an inner diameter of about 75 mm, similar to the fitting hole 41c formed in the support plate portion 41a of the mounting bracket 41.

[0070] 9, the spherical plain bearing 44 is a known bearing member in which an inner ring 44a with a spherical outer surface is rotatably housed inside a cylindrical sleeve-shaped outer ring 44b. The spherical plain bearing 44 is fixed integrally to the clevis 42 by fixing the outer ring 44b to the through hole 42a, and by rotating the inner ring 44a relative to the outer ring 44b, the orientation of the opening surface of the inner through hole 44c can be tilted and changed.

[0071] As described above, the thickness of the clevis 42 is thinner than the width of the gap between the pair of upper and lower support plate portions 41a of the mounting bracket 41 to which it is attached. Therefore, as shown in Figure 7, the clevis 42 is attached to the gap between the pair of upper and lower support plate portions 41a by interposing a metal spacer member 45 between the upper surface of the lower support plate portion 41a of the mounting bracket 41 and the clevis 42 so that it is positioned in the vertical middle portion of the gap between these support plate portions 41a, and by abutting and supporting the lower end of the inner ring 44a of the spherical plain bearing 44 against the circular support portion 45b of the interposed spacer member 45.

[0072] 8(a) to 8(c), the metal spacer member 45 is preferably formed by cutting a metal plate member having a thickness of about 15.5 mm, which is a predetermined thickness suitable for positioning the clevis 42 in the middle portion of the pair of upper and lower support plate portions 41a. The metal spacer member 45 includes a base plate 45a having a rectangular planar shape and a thickness of about 12 mm, with a width of about 185 mm and a length of about 96 mm, and a circular support portion 45b protruding from the upper surface of the base plate 45a by a protruding height of preferably about 3.0 to 4.0 mm (in this embodiment, a protruding height of 3.5 mm). The circular support portion 45b is formed in a ring shape with a width of about 20 mm, having a circular outer peripheral edge portion with a diameter of about 96 mm, which is the same as the vertical width of the base plate 45a, and a circular inner peripheral edge portion with a diameter of about 75.5 mm, and the inside of the inner peripheral edge portion is an attachment hole 45d through which the shaft pin 43 passes.

[0073] As described above, the spacer member 45 is provided with strip-shaped protrusions 45c extending on both sides of the circular support portion 45b in the diameter direction in the outer region of the circular support portion 45b, protruding from the upper surface of the substrate plate 45a. The strip-shaped protrusions 45c are provided to a height lower than the protruding height of the circular support portion 45b, and protrude from the upper surface of the substrate plate 45a so that the upper surface of the strip-shaped protrusions is lower than the upper surface of the circular support portion 45b by preferably about 1.0 to 2.0 mm. The strip-shaped protrusions 45c are provided extending in a direction parallel to the width of the substrate plate 45a. As a result, when the spacer member 45 is installed on the upper surface of the lower support plate portion 41a of the mounting bracket 41 with the vertical width aligned with the axial direction X of the piston rod 9 and the circular support portion 45b and the band-shaped protrusion 45c facing upward, the band-shaped protrusion 45c is positioned so as to extend in a direction perpendicular to the axial direction X of the piston rod 9.

[0074] As shown in Figure 7, the spacer member 45 is installed on the upper surface of the lower support plate portion 41a of the mounting bracket 41 with the mounting hole 45d aligned with the fitting hole 41c, and then the clevis 42 is placed in the gap between the pair of support plate portions 41a of the mounting bracket 41 with the spacer member 45 interposed between it and the lower support plate portion 41a, and with the mounting hole 45d and fitting hole 41c aligned with the through hole 42a of the clevis and the inner through hole 44c of the inner ring 44a of the spherical plain bearing 44.

[0075] Thereafter, a known shaft pin 43, which is a metal cylinder preferably having an outer diameter of about 75 mm and which has a flange-shaped locking portion 43a at its upper end, is fitted continuously from above the upper support plate portion 41a into the inner through-hole 44c of the inner ring 44a of the spherical plain bearing 44 of the mated clevis 42, the mounting hole 45d of the spacer member 45, and the fitting holes 41c of the pair of upper and lower support plate portions 41a. This provides the connecting portion structure 40 of the seismic isolation damper device of this embodiment, which is used to connect and mount the end portion 9a (tip portion in the extension stroke direction) of the piston rod 9 to the mounting bracket 41, which is preferably fixed integrally to the building 3.

[0076] Furthermore, according to the connection structure 40 of the seismic isolation damper device of this embodiment, if the thickness of the clevis 42 is made thinner than the spacing between the pair of upper and lower support plate portions 41a of the mounting bracket 41 in consideration of workability, etc., even if unexpected biased stress occurs during an earthquake, for example, excessive tilting of the clevis 42 can be prevented by abutting the peripheral portion of the clevis 42 against the upper surface of the spacer member 45, making it possible to prevent interference with the transmission of the extension and contraction stroke amount of the piston rod 9 to the control cylinder unit 19 via the transmission rod-shaped member 18 as the piston rod 9 extends and contracts.

[0077] In particular, according to the connection structure 40 of the seismic isolation damper device of this embodiment, the band-shaped protrusions 45c extending on both sides along the diameter of the circular support portion 45b in the outer region of the circular support portion 45b of the spacer member 45 are provided so as to protrude from the upper surface of the base plate 45a at a height lower than the protruding height of the circular support portion 45b, which more effectively prevents the clevis 42 from tilting and interfering with the transmission of the extension / contraction stroke of the piston rod 9. Furthermore, since the band-shaped protrusions 45c are arranged to extend in a direction perpendicular to the axial direction X of the piston rod 9, it is more effectively possible to prevent large torsional deformation of the long transmission rod member. The presence of the base plate 45a brings the lower surface of the spacer member 45 into wide contact with the upper surface of the lower support plate portion 41a, preventing the spacer member 45 from shifting. Furthermore, since the base plate 45a is positioned lower than the band-shaped protrusion 45c, even if the oil damper system is installed at an angle in the vertical direction, the base plate 45a does not come into contact with the clevis 42, and does not hinder the tilting or rotation of the spherical plain bearing 44.

[0078] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the band-shaped protrusions provided on the outer region of the circular support portion of the spacer member may extend in a curved shape, in a direction other than perpendicular to the axial direction of the piston rod, or even at a certain angle (in such cases, it is desirable to increase the height of the upper surface as necessary to ensure the anti-twist effect). The spacer member does not necessarily have to have a rectangular planar shape. In a seismic isolation damper device, the clevis extending from the end metal fitting provided at the end of the outer cylinder can be joined to the mounting bracket using a connecting structure similar to that of the conventional seismic isolation damper device. It can also be joined to the mounting bracket using a connecting structure similar to that of the connecting structure of the seismic isolation damper device of the above-described embodiment. [Explanation of symbols]

[0079] 1 Oil damper system 2 Foundation structure 3. Building 4 Seismic isolation damper device (oil damper) 5 outer cylinder 6 Hydraulic oil reservoir 7 Inner Cylinder 8 pistons 9 Piston rod 9a End of extension stroke (end of piston rod) 10. Pressure regulating valve unit 11. First check valve for damper 12 Second check valve for damper 13 Valve body 14 Valve body 15 Spring seat 16 Pressure adjusting spring 17 Relief valve 18 Transmission rod member 18a Proximal end 18b Tip 19 Control cylinder unit 20 Cylinder case 21 Control piston 22 Control piston rod 23 Spring 24 Operating unit 25 Passive part 26 Control oil distribution system 27 Communication part 28 Check valve 29 Bypass Road 30 Return valve 32 Air bleed plug 33 Variable damper performance mechanism 35 Mounting seat 36 Spherical plain bearing hardware 37 Mounting part 38 End fittings 38a Bond base 40 Connection structure of seismic isolation damper device 41 Mounting bracket 41a Support plate part 41b Base section 41c fitting hole 42 Clevis 42a through hole 43 Shaft pin 43a Locking portion 44 Spherical plain bearing 44a Inner circle 44b outer ring 44c inner through hole 45 Spacer member 45a PCB plate 45b Circular support 45c Convex strip 45d mounting hole F Hydraulic oil f Control oil R1 First hydraulic chamber R2 Second hydraulic chamber P1 Hydraulic oil inlet port P2 hydraulic oil outflow port P3 Introduction Port P4 discharge port N Neutral position S: Predetermined extension stroke amount

Claims

1. A seismic isolation damper device is disposed between a foundation structure integrated with the foundation ground and a building supported by seismic isolation bearings installed on the foundation structure, and suppresses relative displacement between the foundation structure and the building during an earthquake, and absorbs and attenuates energy caused by shaking during an earthquake. The seismic isolation damper device connects and attaches an end of a piston rod to at least one of mounting brackets fixed integrally to the foundation structure and the building, The mounting bracket comprises a base portion and a support plate portion having a pair of spaced apart upper and lower mounting holes that are provided so as to protrude laterally and in parallel from the base portion, and a clevis having a spherical plain bearing is attached to the inside of a circular through hole at the end of the piston rod that constitutes the seismic isolation damper device, In a state where the clevis is attached by aligning the through-hole with the fitting hole in the space between the pair of upper and lower support plate portions of the mounting bracket, an axial pin is attached by fitting it into the aligned fitting hole and through-hole, whereby the end of the piston rod of the seismic isolation damper device is connected to the mounting bracket, The clevis is disposed in the middle of the space between the pair of upper and lower support plates by interposing a metal spacer member between the clevis and the upper surface of the support plate portion below the mounting bracket, The spacer member is a connecting portion structure of a seismic isolation damper device in which a circular support portion that abuts and supports the lower end of the inner ring of the spherical plain bearing provided in the clevis protrudes at a predetermined height from the upper surface of a base plate of a predetermined thickness.

2. The connection structure of a seismic isolation damper device as described in claim 1, wherein the spacer member has a band-shaped convex portion extending on both sides along the diameter of the circular support portion in the outer region of the circular support portion, protruding from the upper surface of the base plate at a height lower than the protruding height of the circular support portion.

3. 3. The connecting structure of a seismic isolation damper device according to claim 2, wherein the band-shaped convex portion is provided extending in a direction perpendicular to the axial direction of the piston rod.

4. 3. The connecting portion structure of a seismic isolation damper device according to claim 2, wherein the upper surface of the belt-shaped convex portion is lower than the upper surface of the circular support portion by 1.0 to 2.0 mm.

5. 3. The connecting portion structure of a seismic isolation damper device according to claim 1, wherein the circular support portion is provided so as to protrude from the upper surface of the base plate by a protrusion height of 3.0 to 4.0 mm.

6. 3. The seismic isolation damper device is equipped with a damper performance variable mechanism including a pair of control cylinder units: a transmission rod-shaped member that transmits the extension / contraction stroke amount of the piston rod; cylinder cases that are respectively arranged along the extension / contraction stroke direction of the piston rod and filled with control oil; and a control piston that discharges the control oil in the cylinder case from a discharge port when the control piston rod is extended, and when an excessive extension stroke amount or excessive contraction stroke amount that exceeds a predetermined extension stroke amount occurs in the piston rod, the transmission rod-shaped member extends the control piston rod by the excessive extension stroke amount or excessive contraction stroke amount, thereby discharging the control oil from the discharge port, and the transmission rod-shaped member is a long rod-shaped transmission member having one end connected to the tip of the piston rod and transmitting the extension / contraction stroke amount of the piston rod to the control piston rod of the cylinder unit.

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