JP2011112216A - Base isolation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation system capable of efficiently performing installation of a plurality of fluid pressure shock absorbers. <P>SOLUTION: A pair of cylinders 22A, 22B of a vibration damping device 20 are connected with a fastening member 40 of a first fixing member 80. Flanges 42, 44 standing at both left and right sides of the fastening member 40 are respectively fixed on flanges 23A, 23B of the cylinders 22A, 22B. Pointed ends 26A, 26B of piston rods 24A, 24B are respectively fastened to fastening sections 100 through connection mechanisms 90 of second fixing members 81. The second fixing member 81 has a bearing support member 64 where a spherical roller bearing 62 is press-fitted. The bearing support member 64 is connected with a left bracket 68 through a mounting pin 66 which penetrates the spherical roller bearing 62. The end 46 of the fastening member 40 is extended and formed so as to project toward axis rather than ends of the cylinders 22A, 22B, and has a bearing support member 52. The bearing support member 52 is connected with a bracket 56 through a mounting pin 54 which penetrates a spherical roller bearing 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation system configured to dampen the vibration of a building caused by an earthquake and to attenuate the vibration by a vibration damping device.

  In a seismic isolation system configured to prevent vibrations caused by earthquakes from being transmitted to large buildings such as buildings, the building is supported by a laminated rubber so as to be swingable, and a vibration damping device comprising hydraulic shock absorbers at multiple locations of the building The vibration of the building is attenuated by arranging a large number of. As a conventional vibration damping device, for example, there is a large hydraulic shock absorber configured to generate a damping force of 1000 kN (see, for example, Patent Document 1).

JP 2000-257661 A

  In the above seismic isolation system, when a large number of vibration damping devices are installed between a building and a foundation, there is a demand for downsizing and space saving of the vibration damping device due to installation space limitations.

  Also, in the seismic isolation system, the larger the building, the greater the number of vibration damping devices that are installed, which requires considerable labor for the installation work, so there is a demand for reducing the labor involved in the installation work. .

  In view of the above circumstances, an object of the present invention is to provide a seismic isolation system that solves the above problems.

In order to solve the above problems, the present invention has the following means.
(1) The present invention is a seismic isolation system that includes a seismic isolation member that supports a building, and a vibration attenuating unit that is installed between the building and the ground and attenuates the vibration input from the ground.
The vibration damping means is
A first fixing means whose one end is fastened to either the building or the ground;
A second fixing means whose one end is fastened to either the building or the ground;
A plurality of fluid pressure shock absorbers connected between the other end side of the first fixing means and the other end side of the second fixing means;
A universal joint provided between one end side and the other end side of the first and second fixing means,
The other end side of the first fixing means is provided between adjacent ones of the fluid pressure shock absorbers arranged in parallel.
(2) The fluid pressure shock absorber according to the present invention comprises:
A cylinder filled with working fluid;
A piston inserted into the cylinder and defining the inside of the cylinder into two pressure chambers;
A piston rod having one end connected to the piston and the other end extended from one end of the cylinder;
It is characterized by providing.
(3) In the present invention, at least one of the first and second fixing means is a connection that restricts movement of the fluid pressure shock absorber in the axial direction and allows movement in a direction orthogonal to the axial direction. A mechanism is provided.

  According to the present invention, a plurality of fluid pressure shock absorbers are connected in parallel, and the other end side of the first fixing member is disposed between the plurality of fluid pressure shock absorbers, thereby reducing the overall length and reducing the size. In addition to saving space, the damping force can be increased several times by summing the damping force due to the piston action of each fluid pressure shock absorber, so when installing many vibration damping devices The number of installations can be reduced and installation work can be greatly reduced.

It is a block diagram which shows typically one Example of the seismic isolation system by this invention. It is a top view which shows one Example of a vibration damping device. It is a longitudinal cross-sectional view which follows the Y1-Y1 line | wire in FIG. It is a longitudinal cross-sectional view which follows the XX line in FIG. It is a top view which shows the modification of a vibration damping device. It is a longitudinal cross-sectional view which follows the Y2-Y2 line | wire in FIG. It is a modification of a vibration damping device.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram schematically showing an embodiment of a seismic isolation system according to the present invention. As shown in FIG. 1, the building 10 is made of a building such as a condominium or an office building, and is supported on the foundation 12 via a plurality of seismic isolation members 14. As the seismic isolation member 14, for example, laminated rubber in which rubber plates and iron plates are alternately laminated is used. A vibration damping device (vibration damping means) 20 including a fluid pressure buffer is provided between the building 10 and the foundation 12. In this embodiment, the seismic isolation system 30 is configured by the seismic isolation member 14 and the vibration damping device 20.

  Here, the configuration of the vibration damping device 20 will be described.

  FIG. 2 is a plan view showing an embodiment of the vibration damping device according to the present invention. 3 is a longitudinal sectional view taken along line Y1-Y1 in FIG. 4 is a longitudinal sectional view taken along line XX in FIG.

  As shown in FIGS. 2 to 4, the vibration damping device 20 is configured so that the maximum damping force is 2000 kN by combining a pair of fluid pressure shock absorbers 20 </ b> A and 20 </ b> B that exhibit a damping force of 1000 kN per one. Is. The fluid pressure shock absorbers 20A and 20B are hydraulic shock absorbers having cylinders 22A and 22B and piston rods 24A and 24B, respectively.

  In the present embodiment, a configuration in which a pair of hydraulic shock absorbers are arranged in parallel and connected between cylinders will be described as an example. However, for example, a pneumatic shock absorber may be used as a device other than the hydraulic shock absorber. The number of connected shock absorbers is not limited to two, and two or more shock absorbers may be arranged in parallel and connected.

  As shown in FIG. 6, each of the cylinders 22A and 22B is formed in a hollow cylindrical shape, and the inside is filled with hydraulic oil as a working fluid. As will be described later, the insides of the cylinders 22A and 22B are defined in two pressure chambers by pistons connected to end portions of the piston rods 24A and 24B. Further, auxiliary tanks 25A and 25B for supplying hydraulic oil into the cylinders 22A and 22B are provided above the cylinders 22A and 22B.

  Between the pair of cylinders 22A and 22B, the outer periphery is connected by a fastening member 40 from the side in a state where the cylinders 22A and 22B are arranged in parallel so that the extending direction is the same direction (X direction). The fastening member 40 is made of a metal plate such as iron and has linear flanges 42 and 44 extending in the axial direction (X direction) so as to face the outer periphery of the cylinders 22A and 22B.

  Further, the cylinders 22A and 22B have flanges 23A and 23B that protrude to the outer peripheral sides facing each other. The fastening member 40 is abutted with the flanges 42 and 44 erected on the left and right sides facing the flanges 23A and 23B of the cylinders 22A and 22B, and the flanges of the cylinders 22A and 22B and the fastening member 40 are integrated by welding. Secure to. In addition, as a joining means of both flanges, you may use fastening members, such as not only welding but a volt | bolt and a nut.

  The end 46 of the fastening member 40 is formed to extend in the axial direction (X direction) from the ends of the cylinders 22A and 22B. The end 46 has a bearing support member 52 into which a spherical bearing 50 constituting a universal joint is press-fitted. The bearing support member 52 is swingably connected to the right bracket 56 via a mounting pin 54 that penetrates the spherical bearing 50. The right bracket 56 is fastened to, for example, an embedded bolt on the foundation side (fixed side) of the building. Thus, the 1st fixing member 80 is comprised from the fastening member 40 which has the bearing support member 52 in which the spherical bearing 50 which comprises a universal joint is press-fit, the mounting pin 54, and the bracket 56. FIG.

  Therefore, since the fastening member 40 is inserted between the cylinders 22A and 22B and is fixed to the outer periphery of the cylinders 22A and 22B so as to overlap with each other, the projection 40 projects in the axial direction (X direction) from the cylinders 22A and 22B. It is provided to shorten the length. Therefore, the vibration damping device 20 is configured such that the entire length in the axial direction is shortened, and the installation space is reduced, thereby saving space.

  Piston rods 24A and 24B extending in the axial direction (Xa direction) from the left ends of the cylinders 22A and 22B are connected to a fastening portion 100 having tip portions 26A and 26B made of a steel frame or a concrete wall via a connection mechanism 90. . Further, a bearing support member 64 into which a spherical bearing 62 constituting a universal joint is press-fitted between the fastening portion 100 and the piston rods 24A and 24B, a spherical bearing 62 provided on the inner peripheral side of the bearing support member 64, and a spherical bearing An attachment pin 66 penetrating 62 and a left bracket 68 via the attachment pin 66 are provided and connected to the fastening portion 100 so as to be swingable. Note that the left fastening portion 100 is fastened to, for example, an embedded bolt on the movable side of a building that is seismically isolated by laminated rubber or the like. Thus, the second fixing member 81 includes the bearing support member 64 into which the spherical bearing 62 constituting the universal joint is press-fitted, the mounting pin 66 penetrating the spherical bearing 62, the connection mechanism 90, the bracket 68, and the fastening portion 100. Composed.

  Here, the connection mechanism 90 will be described in detail. In the configuration in which the pair of fluid pressure shock absorbers 20A and 20B are arranged in parallel so that the extending directions of the piston rods 24A and 24B are the same direction, when they are integrated, it is simultaneously performed during initial operation due to a difference in damping force and friction force. There is a possibility that a bending force (moment) is applied to any one of the piston rods without being expanded or contracted, and the bearing portion or the sliding portion is galled (a phenomenon in which the two members rub).

  In the present embodiment, as a countermeasure, a connection mechanism 90 that restricts movement in the axial direction between the bracket 68 and the fastening portion 100 and allows movement in the radial direction orthogonal to the axial direction (X direction). Is provided.

  The connection mechanism 90 includes a flange 69 of the bracket 68, a flange housing housing 94, and a sliding member 98.

  The flange housing housing 94 is formed in a box shape so as to movably support the outer periphery of the flange 69 of the bracket 68. Further, the lid portion 94 a of the flange housing housing 94 abuts against the side surface of the flange 69 and restricts movement in the axial direction.

  The sliding member 98 is located on the inner peripheral side of the bracket housing housing 94 so that the bracket housing housing 94 can move in the radial direction perpendicular to the axial direction (the extending direction of the vertical surface including the Y direction) with respect to the side surface of the fastening portion 100. It is a low friction member which contacts.

  The flange portion 94 b of the bracket housing 94 is fixed to the fastening portion 100 with bolts 101. The bracket housing 94 is formed so that its inner wall faces the flange portion 69 of the bracket 68 with a gap S in the radial direction perpendicular to the axial direction. Therefore, the bracket housing 94 is held so as to be movable in the radial direction orthogonal to the axial direction within the gap S. The clearance S is a clearance for the piston rods 24A and 24B to operate simultaneously, and is provided not only in the Y direction (left and right direction) but also in the Z direction (up and down direction). The front end portions 26A and 26B can move in any direction orthogonal to the axial direction.

  By providing such a connection mechanism 90, when the pair of fluid pressure shock absorbers 20A and 20B does not expand and contract at the same time during initial operation, the bracket 68 swings through the spherical bearing 62, and then the inside of the bracket housing housing 94 is moved. The flange 69 of the bracket 68 moves in the radial direction orthogonal to the axial direction, so that a room for escape can be created. As a result, there is room for the connection mechanism 90 to escape at the time of initial operation even if the expansion and contraction does not occur at the same time due to individual differences between the pair of fluid pressure shock absorbers 20A and 20B or aging deterioration. Moment) can be avoided, and the piston can be prevented from being gnawed in the cylinders 22A and 22B by the bending force.

  Further, the fluid pressure shock absorbers 20A and 20B are individually assembled, and a performance test is individually performed after the assembly is completed. When the performance test of the fluid pressure shock absorbers 20A and 20B is performed, the fluid pressure shock absorbers 20A and 20B are attached to the test apparatus at the end portions of the connection mechanism 90 and the cylinders 22A and 22B via test attachments. Then, the fluid pressure shock absorbers 20 </ b> A and 20 </ b> B that have passed the performance test are connected by the first fixing member 80 and the second fixing member 81 to become the vibration damping device 20.

  Therefore, in the vibration damping device 20, each of the fluid pressure dampers 20 </ b> A and 20 </ b> B can simultaneously generate a damping force of 1000 kN, so that a total of 2000 kN of damping force can be generated.

  Next, a modified example of the second fixing member will be described with reference to FIG. In the modification shown in FIG. 5, the connection mechanism 90 is arranged between the end portions 26 </ b> A and 26 </ b> B of the piston rods 24 </ b> A and 24 </ b> B and the fastening portion 100. Further, a bearing support member 64 into which a spherical bearing 62 constituting a universal joint is press-fitted on the side opposite to the connection mechanism 90 ′ of the fastening portion 100, a spherical bearing 62 provided on the inner peripheral side of the bearing support member 64, and a spherical bearing 62. A mounting pin 66 that passes through the left side bracket 68 and a left bracket 68 through the mounting pin 66 are provided. Further, the bracket 68 is fastened to, for example, an embedded bolt or the like on the movable side of the building that is seismically isolated and supported by a laminated rubber (not shown).

  As in the configuration shown in FIG. 2, the inside of the connection mechanism 90 ′ is connected to the tip portions 26A and 26B of the piston rods 24A and 24B, and passes through the bearing support member 64 and the spherical bearing 62 into which the spherical bearing 62 is press-fitted. Mounting bracket 66, a bracket 68 that is swingably connected via the mounting pin 66, and a bracket housing housing 94 that allows and restricts movement of the bracket in the axial direction.

  As another modification of the connection mechanism 90 ′, the bearing support member 64, the spherical bearing 62, and the mounting pin 66 are eliminated, and the bracket 68 is directly fixed to the tip portions 26A and 26B of the piston rods 24A and 24B. And a bracket housing housing 94.

  Here, the internal structure of the fluid pressure shock absorbers 20A and 20B will be described with reference to FIG. 6 is a longitudinal sectional view taken along line Y2-Y2 in FIG.

  As shown in FIG. 6, the vibration damping device 20 is fitted inside the outer case 122 with a cylinder 22A filled with a working fluid (hydraulic oil) 135, and slidable in the Xa and Xb directions in the cylinder 22A. And a combined piston 137. The base end portion of the piston rod 24A is fixed to the piston 137. The vibration damping device 20 includes an auxiliary tank 25A, a liquid passage 129A, a check valve 130, a suction valve 131, and damping valves 132A and 132B (damping force generating means).

  The auxiliary tank 25A is filled with a working fluid 135 made of viscous working oil, and operates according to the volume change between the pressure chamber (left chamber) 136a and the pressure chamber (right chamber) 136b as the piston 137 moves. This is a reservoir tank for assisting in sucking and discharging the fluid 135.

  The liquid passages 129A and 129B are passages for flowing the working fluid 135 between one of the two pressure chambers 136a and 136b in the cylinder 22A defined by the piston 137 and the auxiliary tank 25A.

  The check valve 130 is provided on the left side of the piston 137 so as to open or close depending on the pressure difference between the pressure chamber (left chamber) 136a and the pressure chamber (right chamber) 136b, and from the pressure chamber (right chamber) 136b. The valve is opened so as to allow only the flow of the working fluid 135 to the pressure chamber (left chamber) 136a.

  The suction valve 131 is provided on the right end side of the outer case 122 and opens and closes so as to allow only the flow of the working fluid 135 from the liquid passage 129B to the pressure chamber 136b.

  The damping valves 132A and 132B are damping force generating means that are provided on the left end side of the outer case 122 and that open and close to generate a damping force according to the differential pressure of the working fluid 135 that flows through the liquid passages 129A and 129B. There are two or more.

  In addition, there are two systems, a system A having a damping valve 132A and a system B having a damping valve 132B, in a path communicating between the left pressure chamber 136a and the liquid passage 129A.

  Here, the operation of the vibration damping device 20 configured as described above will be described. When the piston 137 and the piston rod 24A move in the extending direction (Xa direction) with respect to the outer case 122, the check valve 130 of the piston 137 closes, and the pressure in the left pressure chamber 136a increases. With the movement of the piston 137, the working fluid 135 corresponding to the movement passes through the damping valves 132A and 132B from the pressure chamber 136a and is discharged to the liquid passages 129A and 129B. At that time, a damping force based on the valve opening (throttle amount) corresponding to the differential pressure between the damping valves 132A and 132B is applied to the piston 137.

  At the same time, since negative pressure is generated in the right pressure chamber 136b, the suction valve 131 is opened, and the working fluid 135 in the auxiliary tank 25A is supplied to the pressure chamber 136b via the liquid passages 129A and 129B.

  Further, when the piston 137 and the piston rod 24A move in the compression direction (Xb direction) with respect to the outer case 122, the suction valve 131 closes and the pressure in the right pressure chamber 136b increases. Since the volume of the pressure chamber 136b decreases with the compression operation of the piston 137, the working fluid 135 corresponding to the piston movement flows out from the right pressure chamber 136b to the left pressure chamber 136a via the check valve 130 of the piston 137. The The volume of working fluid in which the piston rod 24A is inserted into the left pressure chamber 136a passes through the damping valves 132A and 132B and is discharged to the liquid passages 129A and 129B. At that time, a damping force based on the valve opening (throttle amount) corresponding to the differential pressure between the damping valves 132A and 132B is applied to the piston 137.

  FIG. 7 shows a modification of the vibration damping device. As shown in FIG. 7, in the modification, the two auxiliary tanks 25A and 25B are configured to be integrated into one auxiliary tank 25C. In the vibration damping device 20 in which the pair of fluid pressure shock absorbers 20A and 20B are connected in parallel, the pair of fluid pressure shock absorbers 20A and 20B can simultaneously operate in the same direction to generate a double damping force. Then, after removing the auxiliary tanks 25A and 25B from the fluid pressure shock absorbers 20A and 20B that have passed the performance test, and the fluid pressure shock absorbers 20A and 20B are connected by the fastening member 40 and the second fixing member 60 in parallel, The integrated auxiliary tank 25C is attached to the upper part of the fluid pressure shock absorbers 20A and 20B. Thus, the configuration of the modified example is completed.

  For example, when an external force is applied to the vibration damping device 20 in use, the vibration damping device 20 may be damaged, and the working fluid 135 inside the cylinder may flow out. When the outflow amount of the working fluid 135 increases, the oil level of the auxiliary tank 25C decreases. Further, when the oil level becomes lower than the oil suction port at the upper part of the cylinder, when the fluid pressure shock absorbers 20A and 20B perform an expansion operation or a compression operation due to vibration caused by an earthquake, air is sucked into the cylinders 22A and 22B from the suction valve 131. The air is mixed into the working fluid 135 inside the cylinders 22A and 22B, causing an invalid stroke when the compression operation is started, and the damping force may not rise. Further, when the amplitude is small, the damping force does not increase or the stroke is switched to the compression operation while being lower than the setting.

  As described above, in the vibration damping device 20 having the configuration in which the fluid pressure shock absorbers 20A and 20B are connected in parallel, when one of the hydraulic fluid leaks and the other operates normally, a moment is generated during operation. Occurs, and a bending load is applied to the cylinders 22A and 22B and the piston rods 24A and 24B.

  However, in this modified example, the common auxiliary tank 25C is provided in the two fluid pressure shock absorbers 20A and 20B. Therefore, when the working fluid 135 leaks from one of the cylinders, the two fluid pressure shock absorbers 20A and 20C The damping force of 20B becomes small at the same time, and no moment is generated during operation. Accordingly, even when the working fluid 135 leaks, the damping force of the vibration damping device 20 is reduced, but the entire device is prevented from becoming inoperable.

  In the above embodiment, the configuration in which a plurality of fluid pressure shock absorbers composed of hydraulic shock absorbers are connected in parallel has been described as an example. However, the present invention is not limited to this, and a fluid pressure shock absorber other than a hydraulic shock absorber (e.g. Of course, the present invention can also be applied to a configuration using a buffer using hydraulic pressure or a pneumatic buffer).

10 Building 12 Foundation 14 Seismic isolation member 20 Vibration damping device (vibration damping means)
20A, 20B Fluid pressure dampers 22A, 22B Cylinders 24A, 24B Piston rods 25A, 25B, 25C Auxiliary tank 30 Seismic isolation system 40 Fastening member 42, 44 Flange 50, 62 Spherical bearing 52, 64 Bearing support member 54, 66 Mounting pin 56, 68 Bracket 69 Flange portion 80 First fixing member 81 Second fixing member 90, 90 'Connection mechanism 92 Ball joint 94 Flange storage housing 96 Cover 98 Sliding member 100 Fastening portion 122 Outer case 129A, 129B Liquid passage 130 Check valve 131 Suction valve 132A, 132B Damping valve 135 Working fluid (working oil)
136a, 136b Pressure chamber 137 Piston

Claims (3)

A seismic isolation system that includes a seismic isolation member that supports a building, and a vibration damping unit that is installed between the building and the ground and that attenuates vibrations input from the ground,
The vibration damping means is
A first fixing means whose one end is fastened to either the building or the ground;
A second fixing means whose one end is fastened to either the building or the ground;
A plurality of fluid pressure shock absorbers connected between the other end side of the first fixing means and the other end side of the second fixing means;
A universal joint provided between one end side and the other end side of the first and second fixing means,
The seismic isolation system according to claim 1, wherein the other end side of the first fixing means is provided between adjacent ones of the fluid pressure dampers arranged in parallel. The fluid pressure shock absorber
A cylinder filled with working fluid;
A piston inserted into the cylinder and defining the inside of the cylinder into two pressure chambers;
A piston rod having one end connected to the piston and the other end extending outward from one end of the cylinder;
The seismic isolation system according to claim 1, comprising:   At least one of the first and second fixing means is provided with a connection mechanism that restricts movement of the fluid pressure shock absorber in the axial direction and allows movement in a direction orthogonal to the axial direction. The seismic isolation system according to any one of claims 1 and 2.

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