seismic control device

Abstract

To provide a vibration control device capable of absorbing much more energy until the device reaches critical deformation.SOLUTION: A control vibration device 1 to be installed at a base isolation layer between structures of a building, comprises a tension member 3 connected between the structures of the building, a stopper mechanism 5 provided at the tension member 3, a jack 7 into which the tension member 3 penetrates, a displacement follow-up member 6 fitted to the jack 7 and allowing the tension member 3 to follow the displacement of the base isolation layer. The jack 7 is in a state where a cylinder 72 extends at normal time and the cylinder 72 abuts onto the stopper mechanism 5 and the cylinder 72 compresses during earthquake.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration damping device. [Background technology]

[0002] Conventionally, bearings and damper members (see Patent Document 1 below) installed in seismically isolated buildings have a limit deformation as a device. It is common to design them so that they are below the performance guaranteed deformation for so-called Level 2 earthquake motion as determined by public notice, or below the limit deformation for an earthquake about 1.5 times Level 2 as a margin consideration set depending on the project, or below the seismic isolation clearance.

[0003] On the other hand, in recent years, there have been extremely large earthquakes exceeding 1.5 times the magnitude of Level 2, and external forces that exceed the design assumptions may act, causing these limit deformations to be exceeded.Therefore, there is a need for fail-safe devices that suppress deformation below the limit deformation or seismic isolation clearance so that the seismic isolation layer can remain sound even in the event of earthquake motions that exceed assumptions. Furthermore, there is a need for wind-resistant locking devices to prevent deformation of the seismic isolation layer from the perspective of ensuring livability and elevator operation due to wind loads. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-231601 Summary of the Invention [Problem to be solved by the invention]

[0005] In addition, there is an increase in buildings where elevators and other structures penetrate the seismic isolation layer, such as mid-story seismic isolation buildings. In such cases, residual deformation of the seismic isolation layer after an earthquake is an issue, and there is a demand for devices that can instantly restore the structure from a state where residual deformation exists. Furthermore, there is a demand for vibration control devices that can handle not only earthquake motions that are beyond the design assumptions, such as those exceeding 1.5 times Lv2, but also earthquake motions that exceed Lv2 but are not beyond the assumptions (for example, Lv2 x 1.0 to Lv2 x 1.5, equivalent to Lv3). There is also the issue that if the seismic isolation layer is deformed during strong winds, it can cause problems with elevator operation, so there is a need for devices that can fix the seismic isolation layer or limit deformation due to wind loads.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and provides a seismic control device that can absorb more energy before reaching the limit deformation, functions as a jack to restore residual deformation, and can fix the seismic isolation layer or limit deformation. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention employs the following means. That is, the vibration control device according to the present invention is a vibration control device installed in a seismic isolation layer between the structural members of a building, and includes a tension member connected between the structural members of the building, a stopper mechanism provided on the tension member, a jack through which the tension member passes, and a stopper mechanism attached to the jack. At the same time , The vertical axis is the axis direction and the structure is attached to the building structure so as to be rotatable around the axis, and a displacement-following member that causes the tension member to follow the displacement of the seismic isolation layer. Under normal circumstances, the jack is in a state where the cylinder is extended, and during an earthquake, the cylinder abuts against the stopper mechanism and compresses.

[0008] In a seismic isolation device configured in this way, when the tensile force increases, the jack cylinder comes into contact with the stopper mechanism and is compressed. The cylinder's extension length disappears, and the jack functions as an oil buffer, absorbing energy. When the tensile force increases further and the cylinder is further compressed, the tension member comes into action and absorbs energy. Therefore, it is possible to absorb more energy before reaching the limit deformation. It also functions as a jack, allowing residual deformation to be restored, and it is also possible to fix the seismic isolation layer or limit deformation.

[0009] In the vibration control device according to the present invention, when the cylinder of the jack is compressed during an earthquake, either the relief valve or the orifice may act.

[0010] In a seismic control device configured in this manner, when an earthquake occurs, the cylinder of the jack is compressed, and either the relief valve or the orifice is activated, causing the oil inside the jack to be discharged, thereby exerting viscous damping resistance and absorbing energy.

[0011] The vibration damping device according to the present invention may be configured to close a valve in a pipe leading to either the relief valve or the orifice after an earthquake.

[0012] In a seismic control device configured in this way, after an earthquake, the valve in the pipe leading to either the relief valve or the orifice can be closed to restore residual deformation. During strong winds, the jack cylinder can be extended until it abuts against the stopper, closing the valve in the pipe leading to either the relief valve or the orifice, or fixing the seismic isolation layer within a range below the load acting on the relief valve. [Effects of the Invention]

[0013] The seismic control device of the present invention can absorb more energy before reaching the limit deformation. In addition, it can restore residual deformation of the seismic isolation layer caused by earthquakes or wind loads. Furthermore, it can fix the seismic isolation layer so that it does not deform due to wind loads during strong winds. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view showing the configuration of a vibration damping device according to an embodiment of the present invention. [Figure 2] 1 is a plan view showing the configuration of a vibration damping device according to an embodiment of the present invention. [Figure 3] FIG. 3 is an enlarged view of part III in FIG. 2. [Figure 4]1 shows the configuration of a seismic control device according to one embodiment of the present invention in a state in which the seismic isolation layer is fixed during strong winds. [Figure 5] FIG. 1 is an image diagram of the restoring force characteristics of a two-stage seismic isolation fail-safe of a seismic damping device according to one embodiment of the present invention. [Figure 6] FIG. 1A is a plan view showing the displacement of the vibration control device when a compressive force acts on one embodiment of the present invention, causing the vibration control damper to displace in two directions, and FIG. 1B is a plan view showing the displacement of the seismic isolation rubber. [Figure 7] FIG. 1A is a plan view showing the displacement of the vibration control device when a tensile force acts on one embodiment of the present invention, causing the vibration control damper to displace in two directions, and FIG. 1B is a plan view showing the displacement of the seismic isolation rubber. [Figure 8] 1A and 1B are plan views showing the state in which the jack of the seismic damping device of one embodiment of the present invention is jacked up, and FIG. 1B is a plan view showing the displacement of the seismic isolation rubber. [Figure 9] 1 is a schematic diagram of a jack of a seismic damping device according to one embodiment of the present invention, when a relief valve and a tank are used in the jack during jacking up. FIG. [Figure 10] FIG. 10 is a schematic diagram of a seismic damping device according to an embodiment of the present invention, in which an orifice is used in the jack, when jacked up, and shows a case in which there is no waste oil tank. [Figure 11] 1 is a schematic diagram of a jack-up state when a relief valve is used in a jack of a seismic damping device according to one embodiment of the present invention. FIG. [Figure 12] This is the analysis result of a comparison of response deformation during a maximum earthquake (Lv2 x 2.0 times) using a seismic control device according to one embodiment of the present invention, and shows the response story deformation. [Figure 13] 10 shows the analysis results of a comparison of response deformation during a maximum earthquake (Lv2 x 2.0 times) using a seismic damping device according to one embodiment of the present invention, and shows the response acceleration. [Figure 14] This is the analysis result of a response deformation comparison (Lv2 x 1.5 times) using a seismic control device according to one embodiment of the present invention, showing the response story deformation. [Figure 15] 10 shows the analysis results of a response deformation comparison (Lv2 x 1.5 times) using a vibration damping device according to one embodiment of the present invention, and shows the response acceleration. [Figure 16] This is the analysis result of a response deformation comparison (Lv2 x 1.0 times) using a seismic damping device according to one embodiment of the present invention, showing the response story deformation. [Figure 17] 10 shows the analysis results of a response deformation comparison (Lv2 x 1.0 times) using a vibration damping device according to one embodiment of the present invention, and shows the response acceleration. [Figure 18] A diagram showing the load-deformation relationship (Lv x 2.0) for 16 steel dampers (16 oil buffer jacks). [Figure 19] A diagram showing the load-deformation relationship (Lv x 2.0) for eight vibration control devices (32 oil buffer jacks and eight oil dampers). DETAILED DESCRIPTION OF THE INVENTION

[0015] A vibration damping device according to one embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the vibration control device 1 according to this embodiment is installed in, for example, the seismic isolation layer 12 of the upper and lower structures of the lower part of a building. In the seismic isolation layer 12, a seismic isolation rubber 11 is installed between an upper joint 18a provided on an upper structure 18 and a lower joint 19a provided on a lower structure 19.

[0016] The vibration control device 1 is installed between a post 16a supported by a girder 16 of the lower structure 19 and extending upward, and a post 17a supported by a girder 17 of the upper structure and extending downward. The direction in which the girders 16 and 17 extend is defined as the X direction. The horizontal direction perpendicular to the X direction is defined as the Y direction.

[0017] The vibration control device 1 includes an oil damper 2 and a steel damper device 1X. In this embodiment, a total of four steel damper devices 1X are provided for one oil damper 2, two of which are spaced apart in the vertical direction and two of which are spaced apart in the Y direction. The steel damper device 1X includes a tie rod (tension member) 3, a rotation fixing portion 4, a stopper member (stopper mechanism) 5, a trunnion member (displacement tracking member) 6, and a center hole jack (jack) 7. There is no limit to the number of steel damper devices 1X, as long as two, six, or more steel damper devices 1X are arranged symmetrically with respect to the oil damper 2.

[0018] 2, the extension / contraction direction (axial direction) of the oil damper 2 faces the X direction. The oil damper 2 is disposed between the posts 16a and 17a.

[0019] A joint plate 16b is provided on the post 16a. One end 21 of the oil damper 2 is attached to a damper joint 16c provided on the joint plate 16b. The end 21 of the oil damper 2 is attached to the damper joint 16c so as to be rotatable around an axis extending in the vertical direction.

[0020] A joint plate 17b is provided on the post 17a. The other end 22 of the oil damper 2 is attached to a damper joint 17c provided on the joint plate 17b. The end 22 of the oil damper 2 is attached to the damper joint 17c so as to be rotatable around an axis extending in the vertical direction.

[0021] The tie rod 3 is a steel damper. The tie rod 3 is inserted inside the center hole jack 7, which will be described later. The tie rod 3 is arranged in parallel to the oil damper 2. The tie rod 3 has a rod-shaped shaft 30. The length direction of the shaft 30 is parallel to the extension and contraction direction (X direction) of the oil damper 2. In order to avoid eccentric bending and twisting of the posts 16a, 17a, the tie rods 3 are arranged in a balanced manner above and below the oil damper 2 or on both sides in the Y direction (left and right sides). In this embodiment, four tie rods 3 are arranged above and below the oil damper 2 and on both sides in the Y direction.

[0022] The end 31 of the tie rod 3 is joined via a rotation fixing portion 4 to upper and lower tie rod joint portions 16d provided on the joint plate 16b so as to be rotatable around the axial direction, with the vertical direction being the axial direction.

[0023] A stopper member 5 is provided at the other end 32 of the tie rod 3. As shown in Fig. 3, the stopper member 5 has an outer nut 51A, an inner nut 51B, a rubber ring 52, a ring washer 53, and a disc spring 54. The inner nut 51B, the rubber ring 52, the ring washer 53, the disc spring 54, and the outer nut 51A are arranged in this order from the center side in the axial direction X of the tie rod 3 toward the end 32 side.

[0024] The rubber ring 52 has a disk-shaped seat portion 521 and a rubber ring main body portion 522. The seat portion 521 has a mounting hole formed in the center thereof into which the male screw 34 of the tie rod 3 is inserted.

[0025] The rubber ring main body 522 is formed from a rubber member that is elastically deformable in the axial direction X of the tie rod 3. The rubber ring main body 522 is formed in a disk shape with a thickness greater than that of the inner nut 51B. The inner nut 51B, which is threaded onto the male thread 34 of the tie rod 3, is disposed in an attachment hole formed in the center of the rubber ring 52.

[0026] In the normal state (initial setting position where no displacement occurs in the oil damper 2), there is a distance (gap) G in the axial direction between the rubber ring main body 522 and the jack cylinder 72 of the center hole jack 7 described below. The distance G is a gap that allows displacement of the oil damper 2 in the tensile direction. The distance G is, for example, approximately 300 to 500 mm.

[0027] The ring washer 53 is formed in a disk shape. The male screw 34 of the tie rod 3 is inserted into an attachment hole formed in the center of the ring washer 53. The outer edge of the ring washer 53 is fastened to the base portion 521 of the rubber ring 52 by a bolt 526.

[0028] The outer nut 51A is fastened to the male screw 32 via a disc spring 54 between it and the ring washer 53. By providing the disc spring 54, an axial force is constantly applied to the outer nut 51A, preventing loosening of the outer nut 51A due to co-rotation caused by micro-vibrations and the like, and positioning the outer nut 51A.

[0029] As shown in FIG. 1, a pair of connecting plates 171 are fixed to the support column 17a and spaced apart in the vertical direction. The trunnion member 6 is attached to the connecting plate 171 so as to be rotatable about its axis, which is the vertical axis. A through-hole penetrating in the X direction is formed inside the trunnion member 6. A center hole jack 7 is fitted into the through-hole of the trunnion member 6. The trunnion member 6 causes the tie rod 3 to follow the displacement of the oil damper 2 in the X and Y directions via the center hole jack 7.

[0030] The center hole jack 7 is, for example, a hydraulic jack. The center hole jack 7 has a jack body 71 formed in a substantially cylindrical shape and a jack cylinder 72 extending in the X direction from the jack body 71. A through hole is formed in the jack body 71 and the jack cylinder 72 in the X direction. The shaft portion 30 of the tie rod 3 is inserted into the through hole so as to be slidable in the X direction.

[0031] As shown in Figure 3, in a normal state, the jack cylinder 72 of the center hole jack 7 is extended by a distance H. The distance H is approximately several hundred mm (for example, 250 mm). The jack cylinder 72 is either held under pressure while extended by the distance H, or is stationary without being held under pressure while extended by the distance H.

[0032] As shown in Figure 4, when the seismic isolation layer 12 (see Figure 1) is fixed during strong winds, the jack cylinder 72 of the center hole jack 7 is in contact with or slightly spaced from the stopper member 5, and is either under pressure or stationary without being under pressure.

[0033] As shown in Figure 5, in the seismic isolation device 1, in the event of an earthquake (wind load) exceeding level 2, the center hole jack 7 acts as an oil buffer (shock absorber) to absorb energy. In the event of an even larger earthquake (wind load), the tie rod 3 acts to absorb energy. In other words, it is a seismic isolation fail-safe device that absorbs energy in two stages according to displacement and suppresses deformation.

[0034] A case where a force is applied and the vibration damping device 1 is displaced in the X and Y directions will be described. As shown in Figure 6, when the post 16a and post 17a are displaced so that they approach each other, compressive forces act on the vibration damping device 1 in the X and Y directions. The oil damper 2 contracts, shortening its overall length. The end 21 of the oil damper 2 rotates around its axis relative to the damper joint 16c. The end 22 of the oil damper 2 rotates around its axis relative to the damper joint 17c. The end 31 of the tie rod 3 rotates around its axis relative to the tie rod joint 16d. The trunnion member 6 rotates around its axis relative to the joint plate 171. As a result, the oil damper 1 as a whole tilts in the X direction. Accordingly, the jack body 71 and the jack cylinder 72 slide around the shaft 30 of the tie rod 3, and the center hole jack 7 and trunnion member 6 are displaced in a direction approaching the pivot fixing part 4.

[0035] As shown in Figure 7, when the posts 16a and 17a are displaced apart, tensile forces act on the vibration control device 1 in the X and Y directions. The oil damper 2 expands, increasing its overall length. The jack body 71 and jack cylinder 72 slide around the shaft 30 of the tie rod 3, causing the center hole jack 7 and trunnion member 6 to move away from the pivot fixing member 4 and move closer to the stopper member 5. When the tensile force increases further (the oil damper 2 is displaced a predetermined amount in the tensile direction), the jack cylinder 72 of the center hole jack 7 comes into contact with the rubber ring body 522 of the stopper member 5. The jack cylinder 72 is compressed, and the extension length H of the jack cylinder 72 gradually decreases. The center hole jack 7 functions as an oil buffer to absorb energy.

[0036] As shown in Figures 9 and 11, if the center hole jack 7 is equipped with a relief valve 73, when the jack cylinder 72 is compressed, the relief valve 73, which is provided in a hose (pipe) h1 connected to the pressurized port 78 of the cylinder tube 70, operates. The oil O inside the cylinder tube 70 is discharged and exerts viscous damping resistance to absorb energy. As shown in Figure 9, the discharged oil O is stored in a tank 76 via a hose (pipe) h2. Alternatively, the oil O may be temporarily stored in a pump or accumulator via a hose (pipe) not shown. Furthermore, by discharging the oil O, excessive pressure inside the jack is prevented, preventing damage to the center hole jack 7.

[0037] As shown in Figure 10, when the center hole jack 7 is equipped with an orifice 74, the orifice 74 in the hose h1 operates when the jack cylinder 72 is compressed. The oil O inside the cylinder tube 70 is discharged, exerting viscous damping resistance and absorbing energy.

[0038] 7, when the tensile force becomes even greater (the oil damper 2 is displaced by more than a predetermined amount in the tensile direction), the rubber ring main body 522 is compressed and deformed, the distance (gap) G disappears, and it functions as a stopper that suppresses the displacement of the trunnion member 6. The tie rod 3 acts to absorb the energy.

[0039] When the relief valve 73 shown in Figures 9 and 11 is used, there is no need to close the relief valve 73 unless the jack-up load exceeds the relief load provided by the relief valve 73 (500 kN in the example shown in Figure 5).

[0040] When the orifice 74 shown in FIG. 10 is employed, a valve or electromagnetic valve 75 provided on a hose h3 connected to the orifice 74 is closed during jacking up.

[0041] When a tank 76 is provided as shown in FIG. 9, oil O stored in the tank 76 is returned to the inside of the cylinder tube 70 through a pressurized port 78 by a pump 77 .

[0042] As shown in FIGS. 10 and 11, when the tank 76 is not provided, the discharged oil O is returned to the inside of the cylinder tube 70 from the return port 79 by the hose h3.

[0043] As shown in Figure 7, in order to restore residual deformation, the center hole jack 7 is jacked up and functions as a jack, pulling the tie rod 3 to return the seismic isolation layer to its original position. The center hole jack 7 may be operated by a manual pump or an electric pump and configured to automatically return to its original position using a control system.

[0044] Next, the effect of installing the seismic control device 1 described above was confirmed by time history response analysis for an analytical model of a building having a seismic isolation layer.

[0045] The natural period of the model building is approximately 1.5 seconds when fixed. The seismic isolation period is approximately 5.0 seconds at 200% strain, and the building is made up of natural rubber bearings, lead plug bearings, and eight oil dampers (per direction). Four tie rods 3 (gapped steel dampers for seismic isolation equipped with an oil buffer / jack) are installed per oil damper, for a total of 32 (per direction). Here, since this device (seismic control device 1) only acts in tension, only 16 of them actually bear the load. The gap amount was set to 400 mm, and the jack compression stroke was set to 150 mm.

[0046] In the diagrams below, "with gap steel damper" refers to the seismic isolation device 1 described above, while "without gap steel damper" (a configuration equipped with oil damper 2 but without tie rod 3, pivot fixing portion 4, stopper member 5, trunnion member 6, and center hole jack 7) and "seismic isolation clearance (retaining wall collision)" are shown as comparative examples. As shown in Figure 12, a comparison of the presence and absence of this device (seismic isolation device 1) for an input approximately 2.0 times the Kobe Level 2 earthquake notification shows that the maximum deformation before installation was 692 mm, while after installation it was reduced to less than 626 mm, confirming a 66 mm reduction in deformation. Meanwhile, as shown in Figure 13, the response acceleration increased after installation.

[0047] Furthermore, as shown in Figure 14, when comparing the presence and absence of this device, for an input approximately 1.5 times the Kobe Level 2 (equivalent to Level 3), the maximum deformation was 425 mm before installation, but after installation this deformation was suppressed to 416 mm, demonstrating the energy absorption effect of the oil buffer, which acts from 400 mm.Furthermore, as shown in Figure 15, the response acceleration increases slightly, but remains below 250 gal, below the guideline for furniture tipping.

[0048] On the other hand, as shown in Figures 16 and 17, at 1.0x input at Level 2, the maximum deformation of the seismic isolation layer is 231 mm, which is within a gap of 400 mm, so this device does not come into effect, and the response acceleration is sufficiently reduced to 150 gal or less without impairing the seismic isolation performance.

[0049] Furthermore, Figure 19 shows the history (expressed as a pair of left and right) obtained by the response analysis of this device when the gap displacement is 550 mm.

[0050] In the seismic control device 1 configured in this way, when the tensile force increases, the jack cylinder 72 of the center hole jack 7 comes into contact with the stopper member 5 and is compressed. The extension length of the jack cylinder 72 disappears, and the center hole jack 7 functions as an oil buffer to absorb energy. When the tensile force increases further and the jack cylinder 72 is further compressed, the tie rod 3 comes into action and absorbs energy. Therefore, more energy can be absorbed before the limit deformation is reached. The number of seismic control devices 1 required can be reduced compared to before.

[0051] In addition, during an earthquake, when the jack cylinder 72 of the center hole jack 7 is compressed, either the relief valve or the orifice acts to discharge the oil inside the center hole jack 7, thereby exerting viscous damping resistance and absorbing energy.

[0052] After an earthquake, the residual deformation can be restored by closing the valve in the pipeline leading to either the relief valve or the orifice, or by jacking up the structure within a range below the relief load.

[0053] Furthermore, the tie rod 3 does not become plastic until the extension length H of the jack cylinder 72 disappears. Therefore, in the event of an earthquake (wind load) that does not act on the tie rod 3, replacement of the tie rod 3 is not necessary.

[0054] Furthermore, the installation space can be rationalized because four steel damper devices 1X can be installed in parallel with the oil damper 2. The oil damper 2 and the four steel damper devices 1X may also be installed in separate locations.

[0055] The number of oil dampers 2 required for an earthquake equivalent to level 3 can be reduced by the amount of energy absorbed by the oil buffer, which also serves as the center hole jack 7.

[0056] In strong winds, the seismic isolation layer 12 can be fixed by extending the jack cylinder 72 of the center hole jack 7 in advance until it abuts against the stopper member 5, preventing elevators passing through the seismic isolation layer 12 from being stopped due to deformation caused by wind load.

[0057] Because it exerts two stages of damping force according to the external force level, it is possible to achieve multi-stage damping performance and simultaneously satisfy three requirements: ensuring livability in small to medium earthquakes, preserving household belongings in large earthquakes, and ensuring safety in unexpectedly large earthquakes.

[0058] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention. [Explanation of symbols]

[0059] 1. Seismic control device 1x Steel Damper Device 2. Seismic damper 3 Tie rod (tensile material) 5 Stopper member (stopper mechanism) 6 Trunnion member 7 Center hole jack (jack) 12 Seismic isolation layer 18 Superstructure 19 Undercarriage, 72 Jack cylinder

Claims

1. A seismic control device installed in a seismic isolation layer between building structures, tension members connected between the building structures; a stopper mechanism provided on the tension member; a jack through which the tension member is passed; a displacement following member that is attached to the jack and is attached to the structure of the building so as to be rotatable around an axis in the vertical direction, and causes the tension member to follow the displacement of the seismic isolation layer; Normally, the jack is in a state where the cylinder is extended, In the event of an earthquake, the cylinder abuts against the stopper mechanism, causing the cylinder to compress.

2. 2. The seismic damping device according to claim 1, wherein when the cylinder of the jack is compressed during an earthquake, either one of the relief valve and the orifice acts.

3. 3. The seismic damping device according to claim 2, wherein after an earthquake, a valve in a pipe leading to either the relief valve or the orifice is closed.

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