JP7451449B2 - How to restore a viscous vibration damping device - Google Patents

Description

The present invention relates to a method for restoring a viscous vibration damping device that can be easily restored when a disconnection pin is cut.

Conventionally, Patent Document 1 is known as a viscous type vibration damping device used in combination with a seismic isolation device.

The "viscous vibration damping device and seismically isolated building equipped with the same" in Patent Document 1 includes an upper mounting part and a lower mounting part for mounting on an upper structure and a lower structure, respectively, which are subjected to relative vibration in the horizontal direction. , a viscous damper connected to the upper mounting part and the lower mounting part to damp horizontal vibration of the upper mounting part with respect to the lower mounting part; a release mechanism that releases the connection of at least one of the upper mounting portion and the lower mounting portion to the viscous damper when a horizontal force is generated; One of the parts and the viscous damper are connected in the horizontal direction, and when a horizontal force of more than a certain level is applied to the upper mounting part with respect to the lower mounting part, the upper mounting part and the lower mounting part are disconnected. a decoupling pin having a weakened portion that disconnects one of the portions from the viscous damper in the horizontal direction; and a bending stress prevention means that prevents bending stress from occurring at the weakened portion of the decoupling pin. , the bending stress blocking means being disposed around the decoupling pin between one of the upper mounting portion and the lower mounting portion and the viscous damper, and having an enlarged head. a plurality of bolts having a section, and a holding member fixed to one of the upper mounting part and the lower mounting part and one of the viscous damper, and to which each of the bolts is screwed. and a receiving surface which is fixed to one of the upper mounting part and the lower mounting part and the other of the viscous damper, and which contacts the enlarged head of each of the bolts in a horizontally movable manner. and a lock nut for adjusting the amount of protrusion of each of the bolts from the holding member.

Patent No. 4893061

In the above-mentioned background art, by using a disconnection pin that is disconnected when a horizontal force of a certain level or more is generated, the viscous damper is switched between a case where vibration is damped and a case where vibration is not damped.

With such a configuration, when the connection release pin is cut, it is necessary to replace the connection release pin with a new connection release pin to restore the viscous vibration damping device. Therefore, it has been desired to devise a measure to easily carry out the restoration.

The present invention was devised in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a method for restoring a viscous vibration damping device that can be easily restored when a disconnection pin is cut. purpose.

A method for restoring a viscous vibration damping device according to the present invention includes an upper mounting part and a lower mounting part to be attached to an upper structure and a lower structure, respectively, which are subjected to relative vibration in the horizontal direction; a viscous damper coupled to one of the lower mounting parts to damp horizontal vibrations of the upper mounting part with respect to the lower mounting part; a connecting element for connecting to the other of the lower mounting parts; and a connecting element provided between the other of the upper mounting part and the lower mounting part and the connecting element, the connecting element being connected to the upper mounting part with respect to the lower mounting part. and a release mechanism that releases the connection between the viscous damper and at least one of the upper mounting part and the lower mounting part when a horizontal force of a certain level or more is generated on the damper, and the release mechanism includes: The other of the upper mounting part and the lower mounting part and the connecting element are provided via an upper fixing means and a lower fixing means, respectively, and the other of the upper mounting part and the lower mounting part The viscous damper is connected to the viscous damper in the horizontal direction, and when a horizontal force of more than a certain level is applied to the upper mounting part with respect to the lower mounting part, the other of the upper mounting part and the lower mounting part is disconnected. A decoupling pin having a weakened portion for disengaging the horizontal connection with the viscous damper, and a bending stress prevention means for preventing bending stress from occurring at the weakened portion of the decoupling pin, The bending stress arresting means is disposed around the decoupling pin between the other of the upper mounting portion and the lower mounting portion and the coupling element and has an enlarged head. a plurality of bolts, a holding member fixed to one of the connecting element and the other of the upper mounting part and the lower mounting part, and into which each of the bolts is screwed; and the upper mounting part. and a pedestal having a receiving surface that is fixed to the other of the lower mounting portions and the other of the connecting elements and that contacts the enlarged head of each of the bolts in a horizontally movable manner; In the viscous vibration damping device, which is equipped with a lock nut that adjusts the amount of protrusion of each bolt from the holding member, after the connection release pin is cut at the fragile portion, it is replaced with a replacement connection release pin. When restoring the release mechanism; first, cover one end of the replacement connection release pin with the lower fixing means from which the cut connection release pin was removed, and use a rotation prevention jig to tighten the bolt. The lower fixing means is prevented from rotating; then, the lower fixing means and the replacement uncoupling pin are connected and fixed by bolting; then, the lower fixing means is reversed; and then cut. The above-mentioned upper fixing means from which the removed connection release pin has been removed is covered with the other end of the replacement connection release pin, and the above-mentioned rotation prevention jig is used to prevent the upper fixation means from rotating; then, the above-mentioned It is characterized in that the upper fixing means and the replacement connection release pin are connected and fixed by bolting.

The anti-rotation jig includes a base and two or more shaft members provided upright on the base, and the two or more shaft members include bolts for attaching the lower fixing means to the lower mounting portion. one of the plurality of bolt holes formed in the lower fixing means for inserting the bolts, and a plurality of bolts formed in the upper fixing means for inserting the bolts for attaching the upper fixing means to the upper mounting part; It is characterized by being inserted into or removed from any of the holes.

In the method for restoring a viscous vibration damping device according to the present invention, it is possible to easily restore the device when the disconnection pin is cut.

FIG. 3 is a cross-sectional explanatory diagram of the example vibration damping device shown in FIG. 2; FIG. 2 is a front explanatory view of an example of a device to which the method for restoring a viscous vibration damping device according to the present invention is applied. FIG. 2 is a sectional view taken along the line III-III of the vibration damping device shown in FIG. 1; FIG. 2 is a perspective view of the example decoupling pin shown in FIG. 1; FIG. 2 is an explanatory diagram of the operation of the example shown in FIG. 1; FIG. 2 is an explanatory diagram of the operation of the example shown in FIG. 1; FIG. 2 is a perspective view of a detent jig used in a first step of a preferred embodiment of a restoration method for a viscous vibration damping device according to the present invention. FIG. 6 is an explanatory diagram of the connection and fixation work of the connection release pin to the lower fixing means in the first step of the preferred embodiment of the restoration method of the viscous vibration damping device according to the present invention. FIG. 9 is an explanatory diagram of the reversing operation of the lower fixing means following FIG. 8 . FIG. 10 is an explanatory diagram of the rotation prevention work of the upper fixing means following FIG. 9 . FIG. 11 is an explanatory diagram of the connection and fixing operation of the connection release pin to the upper fixing means, continuing from FIG. 10; FIG. 6 is an explanatory diagram of the first step in the second step of a preferred embodiment of the restoration method for a viscous vibration damping device according to the present invention. FIG. 13 is an explanatory diagram showing how the upper fixing means and the lower fixing means are moved by a sliding sheet during the first step in FIG. 12; FIG. 13 is an explanatory view of the upper fixing means and the lower fixing means being lifted up during the first step in FIG. 12; FIG. 13 is an explanatory view of the lower fixing means being placed on the upper base during the first step in FIG. 12; 13 is an explanatory diagram of a second process in a second step following FIG. 12. FIG. FIG. 17 is an explanatory diagram showing a state in which the upper base is stopped from rotating during the second step in FIG. 16; FIG. 17 is an explanatory diagram of the third step in the second step following FIG. 16, in which the receiving surface of the bending stress prevention means and the pedestal are brought into a non-contact state. FIG. 19 is an explanatory diagram of the third step in the second step, following FIG. 18, and showing the upper base being lifted up. FIG. 20 is an explanatory diagram of the third step in the second step, following FIG. 19, showing how the upper fixing means is fixed to the mounting plate. FIG. 21 is an explanatory diagram of the third step in the second step, following FIG. 20, showing the release mechanism in a suspended state from the mounting plate side.

Hereinafter, a method for restoring a viscous vibration damping device according to the present invention will be explained in detail with reference to the accompanying drawings. First, a viscous vibration damping device, which is the premise of the present invention, will be explained.

1 to 4, the seismic isolation building 1 of this example includes a concrete foundation 2 fixed to the ground with piles etc., a seismic isolation device 5 consisting of an isolator 4 containing a lead support 3, and It is equipped with an office building 6 as a superstructure supported on the foundation 2 via a vibration device 5, and a viscous vibration damping device 7 arranged between the foundation 2 and the office building 6. There is.

The superstructure is preferably an office building, an apartment building, or a single-family house, and particularly preferably a high-rise office building or an apartment building, but the present invention is not limited thereto, and may be applied to other superstructures. It may be a thing.

Further, the upper structure and the lower structure may be an upper part and a lower part of a structure separated by a seismic isolation layer in which the seismic isolation device 5 is installed, respectively.

The seismic isolation device 5, which is interposed between the foundation 2 as a lower structure and the office building 6 and supports the load in the vertical direction (V) of the office building 6, is designed to protect against the load in the horizontal direction H due to an earthquake. An isolator 4 that performs seismic isolation against vibrations, a lead column 3 as an elastoplastic body that damps vibrations in the horizontal direction H and is embedded in the isolator 4, and is fixed to the upper and lower surfaces of the isolator 4, respectively. The isolator 4 is provided with upper and lower mounting steel plates 8 and 9 fixed to the office building 6 and the foundation 2 via anchor bolts or the like, respectively, and the isolator 4 includes a plurality of rigid layers 10 made of steel plates or the like and a rubber plate. The seismic isolation device 5 is made of laminated rubber in which a plurality of elastic layers 11 are alternately laminated in the vertical direction V, and acts as a seismic isolation device against vibrations in the horizontal direction H caused by an earthquake and attenuates the vibrations. A plurality of these are appropriately distributed and arranged on the foundation 2 in order to bear the load of the office building 6.

The seismic isolation device 5 may be made of laminated rubber in which rigid layers made of steel plates etc. and elastic layers made of high damping rubber etc. that effectively damp vibrations are laminated alternately. It may be equipped with a laminated rubber layer in which layers and elastic layers are alternately laminated, and a lead support that is embedded in the laminated rubber layer and effectively damps vibrations.Furthermore, it may be one that uses sliding friction. Even if there is, it may be a combination of the above as appropriate.In short, it acts as a seismic isolator against vibrations in the horizontal direction H due to earthquakes (exhibits an isolator function) and attenuates the vibrations (attenuates the vibrations). It is acceptable as long as it exhibits the following.

Furthermore, the seismic isolation device 5 may not have a damping function, and in that case, a device with a damping function such as a hydraulic damper may be provided separately from the vibration damping device 7.

A vibration damping device 7 that damps vibrations in the horizontal direction H of a high-rise office building 6 that is seismically supported with respect to vibrations in the horizontal direction H with respect to the foundation 2 via the seismic isolation device 5 is configured to The bottom wall plate 26 of the container 25 as a lower attachment part and the attachment plate 66 as an upper attachment part are attached to the foundation 2 and the office building 6 to be vibrated, respectively, and are connected to the bottom wall plate 26 and the attachment plate 66. The viscous damper 21 damps vibrations of the mounting plate 66 in the horizontal direction H relative to the bottom wall 26, and the mounting plate 66 damps the vibrations of the mounting plate 66 relative to the bottom wall 26 due to relative vibrations in the horizontal direction H of the office building 6 and the foundation 2. It has a release mechanism 22 that releases the connection of at least one of the mounting plate 66 and the bottom wall plate 26, in this example the mounting plate 66, to the viscous damper 21 when a horizontal force of a certain level or more is generated.

The viscous damper 21 includes a container 25 that is fixedly connected to the foundation 2 by anchor bolts or the like via the bottom wall plate 26 as the lower mounting portion, and a bottom wall plate 26 of the container 25 that is disposed inside the container 25. A plurality of annular fixing plates 28 are fixed to each other at their respective outer peripheral edges via attachment mechanisms 27 and arranged with gaps between each other in the vertical direction V; A plurality of annular movable plates 29 are disposed in respective gaps between the fixed plates 28 with gaps relative to the fixed plates 28, and are movable in the horizontal direction H relative to the fixed plates 28; A viscous body 30 disposed in the gap between the fixed plate 28 and the movable plate 29 and housed in the container 25 and the inner peripheral edge of each movable plate 29 are fixed to the collar part 32 via the attachment mechanism 31. A cylindrical body 33 with a flange 32 that supports the movable plate 29, and a cylindrical body 34 that is fitted into the cylindrical body 33 so as to be movable in the vertical direction V, and a mounting that is integrally formed on the cylindrical body 34. A connecting member 36 having a flange 35 and a rectangular connecting element for connecting the viscous damper 21 to the mounting plate 66, in which the mounting flange 35 of the connecting member 36 is fixed to the lower surface 38 with a plurality of bolts 37. It includes an upper base 39 and four pedestals 42 fixed to four corners of the upper surface 40 of the upper base 39 with a plurality of bolts 41.

The container 25 includes a rectangular bottom wall plate 26 fixed to the foundation 2 with anchor bolts, etc., a cylindrical side wall plate 45 fixed to the bottom wall plate 26 by welding, bolts, etc., and a cylindrical side wall plate 45 welded to the side wall plate 45. An annular flange plate 46 fixed to the flange plate 46 via welding, bolts, etc., and an annular lid plate 48 having a circular opening 47 in the center through which the connecting member 36 passes. and a plurality of reinforcing members 49 fixed to each of the bottom wall plate 26, side wall plate 45, and collar plate 46 through welding or the like.

The bottom wall plate 26 also functions as a lower attachment part for attaching the vibration damping device 7 to the foundation 2 as a lower structure. It may be a lower mounting plate that is fixed to the bottom wall plate 26 via welding, bolts, etc., and also fixed to the foundation 2 with anchor bolts or the like.

The mounting mechanism 27 includes upper and lower annular plates 51, an annular spacer plate 52 disposed between the outer periphery of each fixing plate 28, and the upper and lower annular plates 51 and the annular spacer together with the outer periphery of each fixing plate 28. The mounting mechanism 31 includes a plurality of bolts 53 for fixing the plate 52 to the bottom wall plate 26, and the mounting mechanism 31 includes an annular spacer plate disposed between the annular plate 54 and the inner peripheral edge of each movable plate 29. 55, and a plurality of bolts 56 for fixing the annular plate 54 and the annular spacer plate 55 to the collar portion 32 together with the inner peripheral edge of each movable plate 29.

The lower surface 57 of the cylindrical body 33 is movably in contact with the upper surface 58 of the bottom wall plate 26 in the horizontal direction H, and a space 61 is maintained between the bottom surface 59 of the cylindrical portion 34 and the inner bottom surface 60 of the cylindrical body 33. Spacers (not shown) are fixed to both surfaces of the movable plate 29 to maintain a gap between the fixed plate 28 and the movable plate 29 and to slidably contact the fixed plate 28. Such a spacer may be provided on the fixed plate 28.

Each of the four pedestals 42 has a receiving surface 62 on its upper surface that is parallel to the horizontal direction H and is a flat sliding surface.

The viscous damper 21 is movable by causing viscous shear deformation in the viscous body 30 disposed in the gap between the fixed plate 28 and the movable plate 29 when the movable plate 29 moves in the horizontal direction H relative to the fixed plate 28. A resistance force due to viscous shear deformation is applied to the movement of the plate 29 in the horizontal direction H, causing vibrations in the horizontal direction H of the movable plate 29 and, in turn, vibrations in the horizontal direction H of the office building 6 via the mounting plate 66. It is designed to dampen vibrations.

The mounting plate 66 is fixed to the lower surface 65 of the office building 6 with bolts or the like.

The release mechanism 22 connects one of the mounting plate 66 as an upper mounting portion and the bottom wall plate 26 as a lower mounting portion, in this example, the mounting plate 66 and the viscous damper 21 in the horizontal direction H, and When a horizontal force of more than a certain level is applied to the mounting plate 66 against the bottom wall plate 26 due to the relative vibration of the building 6 and the foundation 2 in the horizontal direction H, it breaks, and in this example, it is sheared in the horizontal direction H and the mounting plate 66 and the viscous damper 21 in the horizontal direction H, and centering on the connection release pin 68 having a constriction 67 as a weak part to release the connection in the horizontal direction H, and the connection member 36 of the connection release pin 68 to the constriction 67. A bending stress prevention means 70 that prevents the generation of bending stress in the constricted portion 67 due to the addition of a bending moment in the R direction, and one main body 71 of the connection release pin 68 are attached to one of the mounting plate 66 and the bottom wall plate 26. On the other hand, this example includes a fixing means 72 for fixing to the mounting plate 66 and a fixing means 74 for fixing the other main body 73 of the decoupling pin 68 to the upper base 39 of the viscous damper 21.

The connection release pin 68 is connected to a cylindrical main body 71 which is fixed to the mounting plate 66 via a fixing means 72 and has a screw hole 75 on one end surface, and to the upper base of the viscous damper 21 via a fixing means 74. 39 and integrally includes a cylindrical main body 73 having a screw hole 76 on one end surface, and a constricted part 67 as a weak part interposed between the two main bodies 71 and 73. .

The uncoupling pin 68 usually consists of both bodies 71 and 73 and a weakened part formed integrally, but the weakened part may be made of a material with lower mechanical strength than both bodies 71 and 73, Such a material with low mechanical strength may be used for the constricted portion 67.

The fixing means 72 includes a holding member 84 that is fixed to the lower surface 82 of the mounting plate 66 by a plurality of bolts 81 and has a recess 83 into which the main body 71 is tightly fitted, and a central portion of the holding member 84. The fixing means 74 is fixed to the upper surface 40 of the upper base 39 by a plurality of bolts 86. A holding member 89 having a recess 88 into which the main body 73 is tightly fitted, and a bolt 90 passing through the center of the holding member 89 and screwed into the screw hole 76 of the main body 73. The lower surface of the holding member 84 and the upper surface of the holding member 89 face each other with a gap 91 between them, and the constricted portion 67 is arranged at the position of the gap 91.

Therefore, the upper base 39, which includes the cylindrical part 34 fitted for vibration transmission into the cylindrical body 33 on which the movable plate 29 of the viscous damper 21 is disposed, is connected to the upper mounting part through the connection release pin 68. It is suspended from a mounting plate 66. A space 61 is formed between the bottom surface 59 of the columnar part 34 and the inner bottom surface 60 of the cylindrical body 33 due to the suspension by the connection release pin 68 .

The bending stress prevention means 70 is interposed between one of the mounting plate 66 and the bottom wall plate 26, in this example, between the mounting plate 66 and the viscous damper 21, and also between the mounting plate 66 and the viscous damper 21. At least one of the four bolts 95 (only two are shown) as an intervening member that is movable in the horizontal direction H with respect to the viscous damper 21 in this example, and a pedestal 42 to hold each bolt 95. The mounting plate 66 is provided with four holding members 98 fixed to each of the four corners of the lower surface 82 by a plurality of bolts 96 and each having a screw hole 97.

Each of the bolts 95 serving as a plurality of supports arranged around the connection release pin 68 is screwed into a screw hole 97 of a corresponding holding member 98, and is movable in the horizontal direction H with its enlarged head. It is in contact with the receiving surface 62 of the corresponding pedestal 42. The amount by which each bolt 95 is screwed into the screw hole 97 of the corresponding holding member 98 is fixed by a lock nut 99 screwed onto each bolt 95 . The amount of screwing in, in other words, the amount of protrusion of each bolt 95 from the corresponding holding member 98 can be adjusted by loosening the lock nut 99.

In a preferred example, the bending stress prevention means 70 is interposed between the viscous damper 21 and one of the upper mounting portion (mounting plate 66) and the lower mounting portion (bottom wall plate 26), and An intervening member (bolt 95) is provided that is movable in the horizontal direction H with respect to one of the mounting parts and at least one of the viscous damper, and the intervening member is connected to the upper mounting part and the lower mounting part. contacting one of the parts and the viscous damper at one end so as to be movable in the horizontal direction H, or contacting one of the upper mounting part and the lower mounting part and the other of the viscous damper at the other end. It is preferable that the damper is in contact with the viscous damper so as to be movable in the horizontal direction H, or in contact with one of the upper mounting part and the lower mounting part and the viscous damper in a movable manner in the horizontal direction H, and , may consist of a plurality of, preferably at least three, struts (bolts 95) arranged around the decoupling pin 68.

In the above-described seismic isolation building 1 with a vibration damping function, as shown in FIGS. The head is in contact with approximately the center of the receiving surface 62 of the corresponding pedestal 42 in the horizontal direction H. In this state, when a strong wind occurs and the office building 6 is vibrated in the horizontal direction H with respect to the foundation 2 due to shear deformation of the elastic layer 11 of the seismic isolation device 5, the vibration is caused by, for example, a predetermined amount of If the amplitude is below the amplitude and the magnitude of the horizontal force that causes the vibration is below a certain level, the vibration in the horizontal direction H of the office building 6 will be transmitted to the upper base 39 without shearing the constricted portion 67. As a result, in addition to the elastic-plastic deformation of the lead column 3 buried in the isolator 4 in the horizontal direction H, the movable plate 29 also deforms as the office building 6 moves in the horizontal direction H, as shown in FIG. When the movable plate 29 is moved in the horizontal direction H, the viscous body 30 in the gap between the movable plate 29 and the fixed plate 28 is deformed by viscous shearing, and the lead column 3 is moved in the horizontal direction H. In addition to the resistance force caused by elastoplastic deformation, the resistance force caused by this viscous shear deformation in the viscous damper 21 damps the vibration of the movable plate 29 in the horizontal direction H, thereby causing the horizontal direction H of the office building 6 to Attenuates vibrations. When the strong wind subsides, the seismic isolation building 1 is returned to the state shown in FIGS. 1 and 2 by the origin return function of the elastic layer 11 of the seismic isolation device 5.

When an earthquake occurs and the office building 6 is vibrated in the horizontal direction H relative to the foundation 2 due to shear deformation of the elastic layer 11 of the seismic isolation device 5, the magnitude of the horizontal force that causes the vibration is constant. The case below is also the same as above, and the resistance force due to the elastic-plastic deformation in the horizontal direction H of the lead column 3 and the resistance force due to the viscous shear deformation in the viscous damper 21 are combined in the horizontal direction of the office building 6. The vibrations of H are damped.

On the other hand, when an earthquake occurs and the office building 6 is vibrated in the horizontal direction H relative to the foundation 2 due to shear deformation of the elastic layer 11 of the seismic isolation device 5, the magnitude of the horizontal force that causes the vibration is is above a certain level, in other words, when the acceleration of the earthquake is large, the constricted portion 67 is sheared in the horizontal direction H, and the mounting plate 66 and the viscous damper 21 become horizontal, as shown in FIG. The connection in the direction H, in other words, the connection in the horizontal direction H between the office building 6 and the viscous damper 21 is released, and the vibration of the office building 6 in the horizontal direction H relative to the foundation 2 is transmitted to the upper base 39. As a result, the movable plate 29 is stopped at that position and does not perform any damping operation, while the lead column 3 is sufficiently deformed due to the movement of the office building 6 in the horizontal direction H, resulting in a large horizontal force. The movement of the office building 6 in the horizontal direction H is preferably attenuated quickly by the elastic-plastic deformation of the lead column 3.

After the constricted portion 67 is sheared, the upper base 39 falls by the space 61, so that each receiving surface 62 of the pedestal 42 is separated from the enlarged head of the corresponding bolt 95.

By the way, according to the seismic isolation building 1, when the magnitude of the horizontal force caused by strong winds or earthquakes applied to the office building 6 is below a certain level, the bolts 95 arranged around the connection release pin 68 are Since the head is movable in the horizontal direction H and in contact with the receiving surface 62 of the corresponding pedestal 42, a bending moment in the R direction centered around the connecting member 36 due to such strong winds or earthquakes is generated. Even if the bending moment occurs on the mounting plate 66 through the office building 6, the bending moment in the R direction is prevented from being applied to the constriction part 67, and the bending moment at the constriction part 67 due to the bending moment in the R direction is prevented. Generation of stress is prevented, mechanical fatigue due to stress generation can be avoided, and unintended breakage of the constricted portion 67 due to mechanical fatigue can be eliminated.

That is, according to the seismic isolation building 1 in which an office building 6 is supported on the foundation 2 via a seismic isolation device 5 that performs seismic isolation against vibrations in the horizontal direction H due to an earthquake and attenuates the vibrations. The viscous damper 21 is connected to the office building 6 and the foundation 2 in the horizontal direction H to damp vibrations of the office building 6 in the horizontal direction H. When a horizontal force of As a result, small vibrations caused by wind, etc. can be effectively damped at an early stage, and a damping effect can be obtained during strong winds.Furthermore, the office building 6 can be effectively damped against large vibrations caused by earthquakes that generate horizontal forces above a certain level. Since only the seismic isolation device 5 is activated for vibration damping, it is also necessary to make the stroke of the viscous damper 21 long so that it can be activated even in response to large vibrations caused by horizontal forces above a certain level. As a result, a small viscous damper 21 can be used, and the shear release mechanism 22 allows horizontal force to be applied to the constriction 67 of the decoupling pin 68 while allowing shear at the constriction 67. , is provided with a bending stress prevention means 70 that prevents the generation of bending stress in the constricted portion 67 due to the application of a bending moment in the R direction to the constricted portion 67 of the connection release pin 68. Mechanical fatigue of the constricted portion 67 of the decoupling pin 68 due to moment can be avoided, and unintended breakage (cutting) of the constricted portion 67 of the decoupling pin 68 due to such mechanical fatigue can be avoided. As long as shear in the horizontal direction H due to horizontal force does not occur in the constricted portion 67 of the connection release pin 68, the viscous damper 21 can effectively dampen minute vibrations caused by wind, etc., and is effective in controlling strong winds. You can get a shaking effect.

As the seismic isolation device, instead of using the lead columns 3, a friction type seismic isolation device using friction may be used. occurs, instead of releasing the connection in the horizontal direction H between the viscous damper 21 and the office building 6 via the mounting plate 66, the connection in the horizontal direction H between the viscous damper 21 and the foundation 2 via the bottom wall plate 26 may be canceled. Alternatively, the space 61 may not be provided to prevent the upper base 39 from falling after the constricted portion 67 is sheared. Furthermore, an elastic body may be provided in the space 61 to prevent the upper base 39 from falling after the constricted portion 67 of the connection release pin 68 is sheared. The vertical tensile force based on the load on the upper base 39 etc. may be avoided as much as possible, and if the upper base 39 is to be prevented from falling after shearing, the bearing surface 62 and bolts 95 may be applied even after shearing. The width of the receiving surface 62 is made sufficiently large to ensure contact with the bolt 95, and if necessary, a lubricant such as grease is interposed on the contact surface between the receiving surface 62 and the bolt 95. Although at least one of the methods of interposing a low-friction member between the bolt 95 and the bolt 95 may be applied, it is necessary to prevent unnecessary shearing force in the horizontal direction H from being applied to the constricted portion 67 before shearing. In order to achieve this, the contact surface between the receiving surface 62 and the bolt 95 may be made rough so as to generate some frictional resistance.

Note that by replacing the disconnection pin 68 that has been sheared at the constricted portion 67 with a new disconnection pin 68 that has not been sheared at the constricted portion 67, it can be used again as the release mechanism 22 in the seismically isolated building 1.

Next, a preferred embodiment of the restoration method for a viscous vibration damping device according to the present invention will be described. The recovery method consists of a first step and a second step.

The first step is a stage in which, after the connection release pin 68 is cut at the constricted portion (weak portion) 67, the connection release pin 68 is replaced with a replacement connection release pin 68 to restore the release mechanism 22.

The second step is a stage in which the replacement decoupling pin 68 and the replaced release mechanism 22 are assembled into the viscous vibration damping device 7 for restoration.

In preparation for starting the restoration work, bolts 81 and 86 is loosened and removed, the fixing means 72 and 74 are taken out from the space between the mounting plate 66 and the upper base 39 together with the cut connection release pin 68, and The decoupling pin 68 is removed from the fixing means 72 and 74.

Therefore, at the start stage of the restoration work, the upper and lower fixing means 72 and 74 on the mounting plate 66 side and the upper base 39 side are removed from the viscous vibration damping device 7. Hereinafter, the fixing means fixed to the mounting plate 66 will be referred to as upper fixing means 72, and the fixing means fixed to upper base 39 will be referred to as lower fixing means 74.

In the first step of the restoration work, a detent jig 110 as shown in FIG. 7 is prepared. The anti-rotation jig 110 is composed of a single base 111 that is a highly rigid plate-like material, and two or more highly rigid and straight shaft members 112 that are provided upright on the base 111. In this embodiment, the shaft member 112 is a fully threaded bolt, and the minimum number of bolts necessary for preventing rotation is two, and the base 111 is provided with screws in order to install the shaft member 112, which is a fully threaded bolt. A shaft bolt hole 111a with a ridge is formed.

The base 111 includes a replacement decoupling pin 68 that is newly attached to the upper fixing means 72 and the lower fixing means 74 by replacement, and temporarily holds the retaining member 89 of the lower fixing means 74, and also temporarily fixes the upper fixing means 74. It is used to temporarily mount retaining members 84 and 89 of both means 72 and lower fixing means 74.

When the shaft member 112 is installed in the shaft member bolt hole 111a, the portion protruding above the base plate 111 is connected to upper fixing means arranged vertically via the connection release pin 68, as shown in FIG. 72 and the lower fixing means 74 are formed with a dimension longer than the overlapping height of the upper and lower holding members 84 and 89.

As described above, the holding members 84 and 89 of the upper fixing means 72 and the lower fixing means 74 are attached and fixed to the mounting plate 66 and the upper base 39, respectively, with a plurality of bolts 81 and 86. , each of the holding members 84 and 89 of the upper fixing means 72 and the lower fixing means 74 has a plurality of bolt holes 113 through which the bolts 81 and 86 for attaching these to the mounting plate 66 and the upper base 39 are inserted. and 114 are formed in the same number and at the same position.

For example, after the lower fixing means 74 is placed on the base 111, the two shaft members 112 are inserted into and removed from the two bolt holes 114 of the holding member 89, and are screwed into the shaft bolt holes 111a. .

The holding member 89 of the lower fixing means 74, in which the two shaft members 112 are inserted through the bolt holes 114, is prevented from horizontally rotating on the base 111.

Further, as will be described later, the two shaft members 112 are stacked on the holding member 89 of the lower fixing means 74 and inserted into the two bolt holes 113 of the holding member 84 of the upper fixing means 72 placed on the base 111. It is inserted so that it can be inserted and removed freely.

This prevents the holding member 84 of the upper fixing means 72 from horizontally rotating on the base 111.

The two shaft members 112 are preferably inserted into the two bolt holes 113 and 114 that are the most distant from each other in the holding members 84 and 89 of the lower fixing means 74 and the upper fixing means 72, respectively. , are arranged on the base plate 111 in accordance with the positions of the bolt holes 113 and 114.

Thereby, the holding members 84 and 89 of the upper fixing means 72 and the lower fixing means 74 can be effectively prevented from rotating.

First, the replacement decoupling pin 68 is placed on the base 111 of the prepared anti-rotation jig 110, with the main bodies 71 and 73 positioned above and below, as shown in FIG.

Next, the holding member 89 of the lower fixing means 74 from which the cut disconnection pin was removed is attached to one main body 73 that becomes one end of the replacement disconnection pin 68, and the two shaft members 112 are attached to the two bolts. The main body 73 is inserted into the hole 114 and covered, and the one main body 73 is fitted into the recess 88 of the holding member 89.

At this time, the vertical orientation of the holding member 89 of the lower fixing means 74 is different from the orientation after restoration, and is in an upside-down orientation.

By being inserted through the two shaft members 112, the holding member 89 is attached to a rotation preventing jig 110 for bolt fastening work, and thereby the holding member 89 can be prevented from rotating.

Next, a nut 115 is screwed onto each shaft member 112. Thereby, the holding member 89 can be firmly fixed to the rotation prevention jig 110. Nut 115 may not be used.

Next, a bolt 90 passing through the center of the holding member 89 is screwed into the screw hole 76 of the main body 73.

As a result, one main body 73 of the replacement connection release pin 68 is connected and fixed to the holding member 89 of the lower fixing means 74.

When the bolt 90 is screwed into the screw hole 76, the rotation of the holding member 89 can be reliably prevented by the anti-rotation jig 110, and the replacement decoupling pin 68 can be smoothly and Can be properly fixed.

Next, the nut 115 is removed from each shaft member 112 and the shaft member 112 is removed from the base 111 (the shaft member 112 may be removed with the nut 115 screwed onto the shaft member 112), and the connection release pin 68 is recessed. At point 88, the connected holding member 89 is removed from the detent jig 110.

After further inverting the holding member 89 vertically, as shown in FIG. Place it on the base 111 so that it fits.

When the holding member 89 of the lower fixing means 74 is placed on the base 111, the other main body 71 of the replacement decoupling pin 68 is projected upward from the recess 88 of the holding member 89. .

Next, when assembling the holding member 84 of the upper fixing means 72 from which the cut connection release pin was removed to the other main body 71, which is the other end of the replacement connection release pin 68, as shown in FIG. Adjust the bolt holes 113 to match the shaft bolt holes 111a so that the holding member 84 can be placed over the main body 71 while inserting the two shaft members 112 into the two bolt holes 113 of the member 84. As a result, the other main body 71 is fitted into the recess 83 of the holding member 84 .

At this time, as shown in FIG. 11, the holding member 84 of the upper fixing means 72 is stacked on the holding member 89 of the lower fixing means 74, and the vertical direction of the holding member 84 is the same as the posture after recovery. , is attached to the rotation prevention jig 110.

The two upper and lower holding members 84 and 89 are both inserted through the two shaft members 112 to be attached to a rotation prevention jig 110 for bolt fastening work, thereby preventing rotation of the holding members 84 and 89. can.

The two shaft members 112 are inserted into the bolt holes 113 and 114 of the upper fixing means 72 and the lower fixing means 74, and are screwed into the shaft bolt holes 111a, so that the upper fixing means 72 and the lower fixing means It can also function as a ruler to confirm that the circumferential position of 74 is correct.

Next, a nut 115 is screwed onto each shaft member 112. Thereby, the holding members 72 and 74 can be firmly fixed to the rotation prevention jig 110. Nut 115 may not be used.

Next, a bolt 85 passing through the center of the holding member 84 is screwed into the screw hole 75 of the main body 71 (see FIG. 10).

As a result, the other main body 71 of the replacement connection release pin 68 is connected and fixed to the holding member 84 of the upper fixing means 72 .

When the bolt 85 is screwed into the threaded hole 75, the rotation of the holding member 84 can be reliably prevented by the anti-rotation jig 110, and the replacement decoupling pin 68 can be smoothly and properly attached to the upper fixing means 72. can be fixed to.

After that, the shaft member 112 is rotated to remove it from the shaft member bolt hole 111a, and the shaft member 112 is pulled out from the bolt holes 113 and 114, and is held from the holding members 84 and 89 of the upper fixing means 72 and the lower fixing means 74 to prevent rotation. By removing the jig 110, the upper fixing means 72 and the lower fixing means 74 can be restored to the connected state via the replacement uncoupling pin 68, and the first step can be completed.

At the completion stage of the first step, the upper fixing means 72 and the lower fixing means 74 on the mounting plate 66 side and the upper base 39 side are removed from the viscous vibration damping device 7.

The first step of the restoration method of the viscous vibration damping device according to the present embodiment described above, that is, after the connection release pin 68 is cut at the constricted portion 67, the connection release pin 68 is replaced with a replacement connection release pin 68, and the release mechanism 22 is replaced with a replacement connection release pin 68. The step of restoring is to cover one main body 73 of the connection release pin 68 with the lower fixing means 74 and prevent it from rotating, and to connect and fix the lower fixing means 74 to the main body 73. After the means 74 is reversed, the upper fixing means 72 is placed on the lower fixing means 74 to cover the other main body 71 of the uncoupling pin 68 and prevented from rotating, and the upper fixing means 72 is connected and fixed to the main body 71. The release mechanism 22 can be easily and appropriately restored by simply carrying out the following steps.

Further, the anti-rotation jig 110 is provided upright on the base 111 and the base 111, is inserted into and removably inserted into the bolt holes 113 and 114 of the upper fixing means 72 and the lower fixing means 74, and is inserted into and removed from the shaft material bolts of the base 111. It has a simple configuration of two or more shaft members 112 that are screwed into holes 111a.

All that is required is to provide the base 111 with the shaft members 112 that are inserted into the bolt holes 113 and 114 that are originally provided in the upper fixing means 72 and the lower fixing means 74, and are easy to manufacture and handle. The work of attaching the replacement decoupling pin 68 to the side fixing means 72 and 74 can be carried out smoothly.

The procedure for installing the shaft member 112 and the holding members 84 and 89 is not limited to the above method. For example, when installing the holding member 89 on the anti-rotation jig 110, the holding member 89 is installed on the base 111 by aligning the shaft material bolt hole 111a and the bolt hole 114 of the holding member 89 so that they overlap vertically. After that, the shaft member 112 may be passed through the bolt hole 114 and screwed into the shaft member bolt hole 111a.

On the other hand, the two shaft members 112 of the anti-rotation jig 110 may be fixed to the base 111 in advance. In this case, when installing the holding members 84 and 89 on the rotation prevention jig 110, the holding members 84 and 89 are installed on the base 111 while passing the shaft members 112 through the bolt holes 113 and 114 thereof.

The procedure for removing the holding members 84 and 89 from the rotation prevention jig 110 may be performed in the opposite direction to the installation procedure.

Next, the second step of the recovery work will be explained. The second step is a stage in which the release mechanism 22 replaced with the replacement connection release pin 68 is assembled into the viscous vibration damping device 7 and restored.

First, the upper fixing means 72 and the lower fixing means 74 (see FIG. 11), which have been removed from the mounting plate 66 and the upper base 39 and replaced with the replacement uncoupling pin 68 in the first step, are connected. 12, a first step of moving the mounting plate 66 and the upper base 39 to a predetermined position P in the vertical space S is carried out.

When moving, the lower fixing means 74 is slid on the upper surface 40 of the upper base 39. The predetermined position P refers to a position directly above the cylindrical portion 34 (see FIGS. 1 and 19).

When moving by sliding, it is preferable to spread a sliding sheet 116 on the upper surface 40 of the upper base 39.

The upper fixing means 72 and the lower fixing means 74 are placed on the sliding sheet 116, and the upper fixing means 72 and the lower fixing means 74 are attached to the upper side through the sliding sheet 116 by, for example, pulling the sliding sheet 116. It moves on the upper surface 40 of the base 39.

Once the lower fixing means 74 is positioned at a predetermined position P within the vertical space S between the upper base 39 and the mounting plate 66, the first step of moving is completed by removing the sliding sheet 116.

Specifically, as shown in FIG. 13, the upper fixing means 72 is moved to a predetermined position P, and then, as shown in FIG. 14, the upper fixing means 72 is fastened to the mounting plate 66 with an upper bolt 81.

Since there is a gap d between the mounting plate 66 and the upper base 39 that allows for the movement of the upper fixing means 72 and the lower fixing means 74, the upper fixing means 72 is fastened to the mounting plate 66 with the upper bolt 81. When the lower fixing means 74 is fixed, the lower fixing means 74 can be lifted up from the upper surface 40 of the upper base 39.

The sliding sheet 116 can be pulled out and removed from between the lifted-up lower fixing means 74 and the upper base 39.

Next, as shown in FIG. 15, the upper bolt 81 is loosened and the upper fixing means 72 is lifted down from the mounting plate 66 side.

By lifting down, the lower fixing means 74 can be placed and positioned on the upper surface 40 of the upper base 39.

Next, as shown in FIG. 16, a second step is performed in which the lower fixing means 74 is fixed to the upper base 39 by fully tightening the lower bolts 86.

At the time of completion of this second step, there is a gap d between the upper fixing means 72 and the mounting plate 66.

In the second step, in the tightening work of the lower bolt 86 to finally tighten the lower fixing means 74 to the upper base 39, as shown in FIG. 17, the upper base 39 is prevented from rotating using a rotation prevention jig 117 It is preferable.

The anti-rotation jig 117 is provided to protrude upward from the lid plate 48 of the container 25 of the viscous damper 21, and is arranged along one end surface 39a of the upper base 39 with a gap therebetween. A plurality of eye bolts 118 are inserted into the gaps between these eye bolts 118 and the end surface 39a of the upper base 39, and by being supported by the eye bolts 118, rotation of the upper base 39 due to bolt fastening work is prevented. It is constituted by a rod-shaped rotation stopping member 119 such as a square piece of material.

When the lower bolt 86 is fully tightened, the upper base 39 tends to rotate due to the friction caused by the tightening, but this rotation can be stopped by the anti-rotation jig 117, and the lower fixing means 74 is tightened by the lower bolt 86. It can be appropriately fastened and fixed to the upper base 39.

Next, a third step is carried out in which the upper fixing means 72 is fully tightened and fixed to the mounting plate 66 with the upper bolt 81, thereby suspending the release mechanism 22 from the mounting plate 66 side.

At the stage of entering the third step, as described above, there is a gap d between the upper fixing means 72 and the mounting plate 66.

In order to fully tighten the upper fixing means 72 and the mounting plate 66, it is necessary to lift up the upper fixing means 72 toward the mounting plate 66 so as to eliminate the gap d. Since the side fixing means 74 and the upper base 39 have already been connected and fixed, this is done between the upper base 39 and the lid plate 48 of the container 25 below it.

Further, in the release mechanism 22, when the connection release pin 68 is cut, the upper base 39 lands on the lid plate 48 of the container 25, and the receiving surface 62 of the bending stress prevention means 70 and the receiving base 42 are in a non-contact state. However, if no action is taken on the stress blocking means 70 during restoration, when the upper fixing means 72 is lifted up to attach and secure to the mounting plate 66 with the upper bolt 81, the receiving surface 62 and the receiving pedestal 42 will be damaged. This will cause interference and become an obstacle to lift-up.

Therefore, when lifting up, as shown in FIG. By increasing the amount of screwing of the bolt 95 and decreasing the amount of protrusion from the holding member 98 (distance h from the lower surface 82 of the mounting plate 66 to the receiving surface 62), there is a space between the receiving surface 62 and the pedestal 42. Leave a sufficient distance c that does not interfere with lift-up to create a non-contact state.

Next, as shown in FIG. 19, a wedge 120 is inserted between the lid plate 48 of the container 25 and the upper base 39, thereby lifting up the upper fixing means 72 and attaching it downwardly to the lower surface 82 of the mounting plate 66. from close contact. At this time, the cylindrical portion 34 of the upper base 39 also approaches the cylindrical body 33 of the viscous damper 21 .

Next, as shown in FIG. 20, the upper fixing means 72 is fixed by fully tightening the upper bolt 81 to the mounting plate 66.

Thereafter, as shown in FIG. 21, when the wedge 21 is removed, the release mechanism 22 above the upper base 39 can be suspended from the mounting plate 66 side.

After the release mechanism 22 shifts to the hanging state, the lock bolt 99 of the bending stress prevention means 70 is loosened to adjust the amount of protrusion of the bolt 95 from the holding member 98, and the receiving surface 62 and the pedestal 42 are brought into contact. Perform recovery work.

As described above, the second step of restoring the state shown in FIG. 1 by assembling the replacement decoupling pin 66 and the replaced release mechanism 22 into the viscous vibration damping device 7 can be completed.

The second step of the method for restoring the viscous vibration damping device according to the present embodiment described above, that is, the step of incorporating the replacement decoupling pin 68 and the replaced release mechanism 22 into the viscous vibration damping device 7 and restoring the device is as follows. , the upper fixing means 72 and the lower fixing means 74 incorporating the connection release pin 68 are moved to a predetermined position P in the vertical space S between the mounting plate 66 and the upper base 39, and the lower side on the upper base 39 is moved. The fixing means 74 is first fixed to the upper base 39, then the lower fixing means 74 side is lifted up along with the upper base 39 to bring the upper fixing means 72 into close contact with the mounting plate 66, and finally, the mounting All that is required is to fix the upper fixing means 72 under the plate 66 to the mounting plate 66, and the procedure is reasonable and can be easily and appropriately released against the viscous vibration damping device 7. Mechanism 22 can be incorporated for recovery.

Since the upper base 39 is lifted up to bring the upper fixing means 72 into close contact with the mounting plate 66, if the lift-up is released after fixing the upper fixing means 72 to the mounting plate 66, the release mechanism 22 can be opened as is. It is possible to shift to the suspended state, and the release mechanism 22 can be restored to the viscous vibration damping device 7 with an excellent work procedure.

By placing the upper fixing means 72 and the lower fixing means 74 in a connected state via the uncoupling pin 68 on the sliding sheet 116, the sliding sheet 116 allows smooth movement work.

By fastening the upper fixing means 72 to the mounting plate 66, the lower fixing means 74 can be lifted up from the upper base 39, and lifting work can be performed using a separate lifting device or the like. Therefore, the sliding sheet 116 can be easily and rationally removed.

In addition, the lower fixing means 74 can be placed on the upper base 39 by simply loosening the fastening for lifting up.

When the lower fixing means 74 is fully tightened to the upper base 39 with the lower bolt 86, the upper base 39 can be prevented from rotating using the rotation prevention jig 117, so that the lower fixing means 74 can be accurately and easily attached to the upper base. It can be fixed to 39.

When the upper fixing means 72 is lifted up to the mounting plate 66 side and finally tightened, this includes work to bring the receiving surface 62 of the bending stress prevention means 70 into a non-contact state with respect to the pedestal 42, so the upper fixing means can be lifted up to the mounting plate 66 side without any trouble. 72 can be accurately fixed to the mounting plate 66.

After the release mechanism 22 is shifted to the suspended state, work is performed to restore the receiving surface 62 of the bending stress prevention means 70 and the pedestal 41 to the contact state. The release mechanism 22 and also the viscous vibration damping device 7 can be appropriately restored to the same performance as before the disconnection pin 68 was disconnected, without having any adverse effect on the operation.

The technical scope of the present invention should not be interpreted in a limited manner based only on the description of the above embodiments, but should be interpreted solely in accordance with the description of the claims, and as long as it does not deviate from the gist thereof, Includes all changes.

For example, the shaft member 112 is not limited to a fully threaded bolt, but may be a long bolt. In that case, when installing the holding member 89 in the rotation prevention jig 110 shown in FIG. 8, it is desirable to use a long bolt with a length such that the lower surface of its head touches the upper surface of the holding member 89. Furthermore, when placing the holding member 84 on the holding member 89 to which the replacement connection release pin 68 shown in FIG. It is desirable to use one.

2 Foundation 6 Office building 7 Viscous vibration damping device 21 Viscous damper 22 Release mechanism 26 Bottom wall plate 33 Cylindrical body 34 Cylindrical part 42 cradle 61 Space 62 Receiving surface 66 Mounting plate 67 Narrow part 68 Connection release pin, for replacement Uncoupling pin 70 Bending stress prevention means 71 Main body 72 Upper fixing means 73 Main body 74 Lower fixing means 84, 89 Holding member 85, 90 Bolt 95 Bolt 98 Holding member 99 Lock nut 110 Stopping jig 111 Base 112 Shaft material 113, 114 Bolt hole

Claims (2)

an upper mounting part and a lower mounting part for mounting on the upper structure and the lower structure, respectively, which are subjected to relative vibration in the horizontal direction;
a viscous damper coupled to one of the upper mounting portion and the lower mounting portion to damp horizontal vibrations of the upper mounting portion with respect to the lower mounting portion;
a connecting element provided on the viscous damper for connecting the viscous damper to the other of the upper mounting part and the lower mounting part;
Provided between the other of the upper mounting part and the lower mounting part and the connecting element, when a horizontal force of a certain level or more is generated on the upper mounting part with respect to the lower mounting part, the upper part against the viscous damper. and a release mechanism for releasing the connection with at least one of the mounting part and the lower mounting part,
The release mechanism is
The other of the upper mounting part and the lower mounting part and the connecting element are provided via an upper fixing means and a lower fixing means, respectively, and the other of the upper mounting part and the lower mounting part The viscous damper is connected to the viscous damper in the horizontal direction, and when a horizontal force of more than a certain level is applied to the upper mounting part with respect to the lower mounting part, the other of the upper mounting part and the lower mounting part is disconnected. a connection release pin having a weakened portion that releases the horizontal connection with the viscous damper;
and a bending stress prevention means for preventing bending stress from occurring at the weakened portion of the connection release pin,
The bending stress blocking means includes:
a plurality of bolts disposed around the decoupling pin and having enlarged heads between the other of the upper attachment part and the lower attachment part and the connection element;
a holding member that is fixed to the other of the upper mounting part and the lower mounting part and to one of the connecting elements, and to which each of the bolts is screwed;
The receiving surface is fixed to the other of the upper mounting part and the lower mounting part and the other of the connecting element, and has a receiving surface movably in contact with the enlarged head of each of the bolts in a horizontal direction. A pedestal and
A viscous vibration damping device comprising a lock nut that adjusts the amount of protrusion of each of the bolts from the holding member,
After the connection release pin is cut at the fragile portion, when replacing the connection release pin with a replacement connection release pin to restore the release mechanism,
First, one end of the replacement connection release pin is covered with the lower fixing means from which the cut connection release pin has been removed, and the lower fixation means is stopped from rotating using a rotation prevention jig for bolt fastening work. do the work,
Next, the lower fixing means and the replacement uncoupling pin are connected and fixed by bolting,
Next, invert the lower fixing means,
Next, the upper fixing means from which the cut connection release pin has been removed is placed over the other end of the replacement connection release pin, and the upper fixation means is prevented from rotating using the rotation prevention jig,
A method for restoring a viscous vibration damping device, characterized in that the upper fixing means and the replacement decoupling pin are connected and fixed by bolting. The anti-rotation jig includes a base and two or more shaft members provided upright on the base,
The two or more shaft members are provided with one of a plurality of bolt holes formed in the lower fixing means for inserting bolts for attaching the lower fixing means into the lower attaching part and one of the bolt holes formed in the lower fixing means and one of the bolt holes formed in the upper fixing part. The viscous system vibration according to claim 1, wherein the viscous system vibration is inserted into or removed from one of a plurality of bolt holes formed in the upper fixing means in order to insert a bolt for attaching the upper fixing means. How to restore the damping device.

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