JP6046986B2 - Damping damper for structures - Google Patents

Description

  The present invention relates to a vibration damper for a structure that suppresses vibrations of structures such as buildings and bridges during an earthquake, and in particular, can efficiently absorb seismic energy against a large displacement of the structure during an earthquake. The present invention relates to a vibration damper for a structure using possible fluid pressure and elastic rubber deformation.

  Oil dampers, air dampers, viscoelastic dampers, and the like are known as structural vibration dampers.

Japanese Patent No. 2541073 Japanese Patent No. 2568833

  Conventional oil dampers and air dampers have a complicated structure, a high cost, and a large number of maintenance such as inspection, repair, and parts replacement. A damping damper having a vibration absorbing function by deformation of an elastic body such as a viscoelastic damper has an advantage that the structure is simple and maintenance is easy. However, a large displacement with different directions acts on the structure during the earthquake, and the axial displacement of the cylinder member and the piston member each having one end fixed to the two structures where the structure is relatively displaced occurs. The load may concentrate on a part of the device and the device itself may be destroyed. In addition, conventional oil dampers and air dampers can be sealed and slid with a sealant etc. between the inner periphery of the hole provided in the lid on the cylinder tip and the outer periphery of the rod to seal the inside of the cylinder. It is said. Rust is likely to occur on the outer periphery of the piston rod exposed outside the damper due to outside air. If the surface of the outer periphery of the rod becomes uneven, the sealing material that plays the role of sealing and sliding is easily scraped and damaged by the unevenness of the outer periphery of the rod. As a result, the sealability of the damper is lost. In order to remove this obstacle, the conventional damper has a problem that maintenance for periodically removing rust on the outer periphery of the rod is required.

  The present invention solves the problems of the prior art, has a simple structure, is easy to manufacture, does not use a complicated valve structure, and does not lose the sealing performance of the cylinder due to rust on the outer periphery of the piston rod. An object of the present invention is to provide a damping damper for a structure that can absorb seismic energy by pressure and seismic energy by elastic deformation of elastic rubber.

In order to solve the above problems, the structural vibration damper of the present invention has a cylinder member that is fixed to one structure that is relatively displaced during an earthquake, closed at one end, and opened at the other end, and the other structure. A valve body that is fixed, extends inward from the opening of the cylinder member, is disposed so as to be relatively displaceable with the cylinder member, has an outer diameter substantially the same as the inner diameter of the cylinder member at the tip, and forms a flow passage an elastic rubber body and the piston rod, in which the inner circumferential surface is fixed its outer peripheral surface the cylinder member inner peripheral surface to the outer peripheral surface of the piston rod at a predetermined distance from said valve body is fixed with the said elastic A ring-shaped partition member in which an outer peripheral portion is fixed to the inner peripheral surface of the cylinder member and an inner peripheral portion is slidably arranged with the outer peripheral portion of the piston rod, between the rubber body and the valve body; Partition wall And a closed end of the cylinder member as a sealed space, and the fluid movement through the flow passage formed in the valve body of the fluid in the sealed space of the cylinder member with respect to the relative displacement of the cylinder member and the piston rod Seismic energy is absorbed by resistance and elastic deformation of the elastic rubber body.

  Moreover, the vibration damper for a structure of the present invention is characterized in that the elastic rubber body is made of a high damping rubber.

  Moreover, the vibration damper for a structure of the present invention is characterized in that an inner diameter of a portion of the cylinder member to which the elastic rubber body is fixed is made larger than an inner diameter of another portion.

  Moreover, the vibration damper for a structure of the present invention is characterized in that a fluid sealed in a sealed space between the cylinder member and the piston rod is a gas.

  Moreover, the vibration damper for a structure of the present invention is characterized in that a fluid sealed in a sealed space between the cylinder member and the piston rod is a liquid.

  Moreover, the vibration damper for a structure of the present invention is characterized in that the flow passage is a small hole penetrating the valve body.

  In the vibration damper for a structure of the present invention, the flow passage is a notch formed in the outer periphery of the valve body.

One end fixed to one structure that is relatively displaced in the event of an earthquake is closed, the other end is open, and the other end is fixed to the other structure. A piston rod having a valve body having a flow path formed at the tip thereof and having an outer diameter substantially the same as the inner diameter of the cylinder member, and a piston rod spaced a predetermined distance from the valve body. An elastic rubber body whose inner peripheral surface is fixed to the outer peripheral surface and whose outer peripheral surface is fixed to the inner peripheral surface of the cylinder member, and an outer peripheral portion between the elastic rubber body and the valve body is the inner peripheral surface of the cylinder member. comprising a ring-shaped partition wall member peripheral section is fixed to a surface is arranged slidably with said piston rod outer peripheral portion, between closed one end of said cylinder member and said ring-shaped partition wall member and the sealing space, before Absorbing seismic energy by relative fluid displacement resistance through the flow passage formed in the valve body of the fluid in the sealed space of the cylinder member and elastic deformation of the elastic rubber body with respect to relative displacement between the cylinder member and the piston rod. With no complicated valve control mechanism, the structure is simple, the number of parts is small, and the elastic rubber body functions as a sealing material, so there is no need to use a sealing material, and the seismic energy can be attenuated efficiently. It is possible to provide a damper structure using fluid pressure, and it is possible to improve the seismic energy attenuation by keeping the volume of the sealed space in the cylinder member constant regardless of the deformation of the elastic rubber body.
By making the elastic rubber body a highly attenuating rubber, it is possible to improve the attenuation performance of seismic energy.
By making the inner diameter of the part that fixes the elastic rubber body of the cylinder member larger than the inner diameter of other parts, it is possible to increase the damping capacity of the seismic energy due to deformation of the elastic rubber by increasing the volume of the elastic rubber body. It becomes.
By making the fluid enclosed in the sealed space of the cylinder member a gas, the gas is a compressible fluid, so in addition to the resistance to fluid movement through the flow path, it is used for absorbing earthquake energy by the cushion effect due to the compression and expansion of the gas It becomes possible to do.
By making the fluid sealed in the sealed space of the cylinder member a liquid, it is possible to provide a liquid damper with a simple structure only by considering the liquid movement resistance of the flow path without complicated valve control. .
Since the flow passage is a small hole penetrating the valve body, a fluid movement resistance means having a simple structure can be provided.
Since the flow passage is a notch formed on the outer periphery of the valve body, a fluid movement resistance means having a simple structure can be provided.

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  An embodiment of a structural vibration damper of the present invention will be described with reference to the drawings. 1 and 2 are views showing an embodiment of a vibration damper for a structure.

  The structure damping damper 1 includes a cylinder member 2 having one end connected to one structure of a structure such as a building or a bridge and having the other end opened, and a piston rod 3 connected to the other structure. I have. The piston rod 3 extends from the opening of the cylinder member 1 to the inside thereof, and is disposed so as to be relatively displaceable with respect to the cylinder member 2.

  The cylinder member 2 is a member having a circular cross section, and a cylinder side mounting member 4 for connection to one structure is fixed to an end portion on the closed side.

  A piston rod side mounting member 5 for connecting to the other structure is fixed to one end of the piston rod 3. A valve body 6 having an outer diameter substantially the same as the inner diameter of the cylinder member 2 is formed at the other end of the piston rod 3.

  An elastic rubber body 7 is fixed between the rear outer peripheral portion of the valve body 6 of the piston rod 3 and the inner wall of the cylinder member 2. An elastic rubber body 7 is fixed between the cylinder member 2 with one end closed and the rear outer peripheral portion of the valve body 6 of the piston rod 3 and the inner wall of the cylinder member 2, and between the closed side of the cylinder member 2 and the valve body 6. The space A and the space B between the valve body 6 and the elastic rubber body 7 are sealed from the outside. Since the elastic rubber body 7 functions as a sealing material, no sealing material is required.

  The elastic rubber body 7 is fixed to the outer periphery of the piston rod 3 and the inner wall of the cylinder member 2 by vulcanization integral molding. Fixing by vulcanization integral molding prevents deterioration of the bonded portion between the steel material and rubber, and allows the sealed state to be maintained for a long period of time. Further, since the elastic rubber body 7 is elastically deformed when the cylinder member 2 and the piston rod 3 are displaced relative to each other, no seal material is required in the conventional damper. Sealing is not lost.

  As shown in FIGS. 3 and 4, the valve body 6 is formed with a flow passage communicating with the spaces A and B. In the embodiment shown in FIG. 3, the flow passage is formed as a small hole 8 that penetrates the valve body 6. In the embodiment shown in FIG. 4, the flow passage is formed as a notch 9 on the outer periphery of the valve body 6.

  The operation of the present invention when a gas such as air is selected as the fluid sealed in the cylinder member 2 will be described. Due to the displacement acting on the structure during the earthquake, the cylinder member 2 connected to one structure part and the piston rod 3 connected to the other structure part are displaced relative to each other.

  A case where the cylinder member 2 and the piston rod 3 are relatively displaced from the state shown in FIG. 1 in the arrow direction shown in FIG. 2 will be described. Due to the relative displacement of the piston rod 2 in the direction of the arrow, the valve body 6 also moves in the direction of the arrow. As a result, the gas in the space B is compressed, its volume decreases, and the pressure increases. On the other hand, the gas in the space A expands, its volume increases, and its pressure decreases. As a result, the gas in the high-pressure space B flows from the flow passage 8 formed in the valve body 6 to the low-pressure space A. The shape of the flow passage 8 may be the small hole 8a or the notch 8b shown in FIGS. 3 and 4, but considering the attenuation of seismic energy due to the fluid movement resistance when the gas flows from the flow passage 8, the flow passage 8 Set the aperture, shape, number, etc.

  With the relative displacement between the cylinder member 2 and the piston rod 3, the elastic rubber body 7 is elastically deformed as shown. As described above, the seismic energy is caused by the cushioning effect due to the compression and expansion of the gas in the space A and the space B according to the relative displacement of the cylinder member 2 and the piston rod 3 and the fluid movement resistance when the gas moves through the flow passage 8. Further, the seismic energy is attenuated by elastic deformation of the elastic rubber body 7 which is attenuated and seals the inside of the cylinder member 2. By making the elastic rubber body 7 a high-damping rubber, it is possible to improve the damping performance of seismic energy.

  The operation of the present invention when a liquid such as oil is selected as the fluid sealed in the cylinder member 2 will be described. Due to the displacement acting on the structure during the earthquake, the cylinder member 2 connected to one structure part and the piston rod 3 connected to the other structure part are displaced relative to each other.

  A case where the cylinder member 2 and the piston rod 3 are relatively displaced from the state shown in FIG. 1 in the arrow direction shown in FIG. 2 will be described. Due to the relative displacement of the piston rod 2 in the direction of the arrow, the valve body 6 also moves in the direction of the arrow. As a result, the liquid in the space B flows into the space A from the flow passage 8 formed in the valve body 6. The shape of the flow path 8 may be the small hole 8a or the notch 8b shown in FIGS. 3 and 4, but in consideration of the attenuation of seismic energy due to fluid movement resistance when liquid flows from the flow path 8, the flow path 8 Set the aperture, shape, number, etc. Since a liquid is an incompressible fluid unlike a gas, the fluid movement resistance through the liquid flow path 8 needs to be set more precisely than in the case of a gas.

  With the relative displacement between the cylinder member 2 and the piston rod 3, the elastic rubber body 7 is elastically deformed as shown. In this way, the seismic energy is attenuated by the fluid movement resistance when the liquid moves through the flow passage 8 in accordance with the relative displacement between the cylinder member 2 and the piston rod 3, and further, the elastic rubber body 7 that seals the inside of the cylinder member 2. Seismic energy is attenuated by elastic deformation of By making the elastic rubber body 7 a high-damping rubber, it is possible to improve the seismic energy absorption performance.

  In the embodiment of the structural vibration damper shown in FIG. 5, a ring-shaped partition wall whose outer peripheral portion is fixed to the inner peripheral surface of the cylinder member 2 between the elastic rubber body 7 and the valve body 6 in the cylinder member 2. The member 9 is arranged so that its inner peripheral portion can slide with respect to the outer peripheral portion of the piston rod 3. In the embodiment shown in FIGS. 1 and 2, the volume of the sealed space A + B in the cylinder member slightly changes due to the deformation of the elastic rubber body 7. The change in the volume of the sealed space in the cylinder member 2 slightly affects the seismic energy attenuation of the fluid damper. In the embodiment shown in FIG. 5, the ring-shaped partition member 9 is arranged to keep the volume of the sealed space in the cylinder member 2 constant and to maintain the seismic energy attenuation of the fluid damper. The material of the ring-shaped partition member 9 is hard rubber or the like.

  In the embodiment shown in FIGS. 6A and 6B, the inner diameter K of the portion where the elastic rubber body 7 of the cylinder member 2 is arranged is made larger than the inner diameter k of the portion of the other cylinder member 2. In the embodiment shown in FIG. 6A, the inner wall portion of the cylinder member 2 on which the elastic rubber body 7 is arranged is scraped into a thin-walled portion 2a, and its inner diameter K is made larger than the inner diameter k of other portions of the cylinder member 2. Yes. In the embodiment shown in FIG. 6B, the inner diameter K of the cylinder member 2b on which the elastic rubber body 7 is arranged is set as K, the outer diameter of the cylinder member 2c connected to the tip of the cylinder member 2b is set as K, and the inner diameter k. Is smaller than the inner diameter K of the cylinder member 2b. By making the inner diameter K of the arrangement part of the elastic rubber body 7 of the cylinder member 2 larger than the inner diameter k of the other part, the volume of the elastic rubber body 7 to be arranged is increased and the seismic energy is attenuated by the deformation of the elastic rubber body 7. The performance can be improved.

  The embodiment shown in FIGS. 7 (a) and 7 (b) corresponds to a case where the length of the vibration damper is different due to the difference in the installation location of the structure. As shown in FIG. 7A, a plurality of cylinder members 2e and 2f having different lengths are prepared for the cylinder member 2d on which the elastic rubber body 7 is disposed. A cylinder member having a desired length is selected from a plurality of cylinder members 2e and 2f having different lengths according to the length of the vibration damper at the place where the structure is installed, and connected to the cylinder member 2d in which the elastic rubber body 7 is disposed. Fix it.

  As described above, according to the vibration damper for a structure of the present invention, due to the fluid movement resistance through the flow passage formed in the valve body of the fluid in the space sealed by the elastic rubber body and the elastic rubber body deformation. By dampening seismic energy, it is possible to provide a damper structure using fluid pressure that can easily damp seismic energy with a simple structure and a small number of parts without providing a complicated valve control mechanism. Become.

  1: Damping damper for structure, 2: cylinder member, 3: piston rod, 4: cylinder side mounting member, 5: piston rod side mounting member, 6: valve body, 7: elastic rubber body, 8: flow passage, 8a: small hole, 8b: notch, 9: ring-shaped partition member

Claims (7)

A cylinder member with one end fixed to one structure that is relatively displaced during an earthquake closed and the other end opened;
Fixed to the other structure, extends inwardly from the opening of the cylinder member, is disposed so as to be relatively displaceable with the cylinder member, and has an outer diameter substantially equal to the inner diameter of the cylinder member at the tip, A piston rod having a valve body formed with
An elastic rubber body whose inner peripheral surface is fixed to the outer peripheral surface of the piston rod spaced a predetermined distance from the valve body, and whose outer peripheral surface is fixed to the inner peripheral surface of the cylinder member;
Between the elastic rubber body and the valve body, a ring-shaped partition member in which an outer peripheral part is fixed to the inner peripheral surface of the cylinder member and an inner peripheral part is slidably arranged with the outer peripheral part of the piston rod;
With
The closed end of the ring-shaped partition member and the cylinder member is used as a sealed space, and the flow formed in the valve body of the fluid in the sealed space of the cylinder member with respect to relative displacement between the cylinder member and the piston rod. A damping damper for a structure, which absorbs seismic energy by fluid movement resistance through a road and elastic deformation of the elastic rubber body.   The structure damping damper for a structure according to claim 1, wherein the elastic rubber body is a high damping rubber.   The structure damping damper according to claim 1 or 2, wherein an inner diameter of a portion of the cylinder member to which the elastic rubber body is fixed is made larger than an inner diameter of another portion.   The structure damper according to any one of claims 1 to 3, wherein the fluid sealed in the sealed space of the cylinder member is a gas.   The structure damper according to any one of claims 1 to 3, wherein the fluid sealed in the sealed space of the cylinder member is a liquid.   The structure damper according to any one of claims 1 to 5, wherein the flow passage is a small hole penetrating the valve body.   The structure damper according to any one of claims 1 to 5, wherein the flow passage is a notch formed in an outer periphery of the valve body.

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