A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PROBLEM TO BE SOLVED: To provide a passive-type vibration reduction device capable of performing an automatic restriction or releasing operation without using any external electrical power, restricting motions of a lower structure and an upper structure under accepting wind load, and releasing the restriction at the time of earthquake to attain a positive isolation effect.SOLUTION: There are provided a cylinder 5; a piston 8 for dividing an inside part of the cylinder 5 into a first cell 6 and a second cell 7; a piston rod 9 having one end connected to the piston 8 and extended to outside in an axial direction of the cylinder 5; and working fluid 10 to be filled in the first cell 6 and the second cell 7. In addition, there is provided a wind lock mechanism 20 for preventing flow of the working fluid 10 between the first cell 6 and the second cell 7 at the time of normal state and action of the wind load, communicating between the first cell 6 and the second cell 7 when a larger vibration than the wind load acts, and reducing attenuation coefficient if it exceeds a predetermined set reaction force.SELECTED DRAWING: Figure 2
【課題】外部電力を使わずに拘束や解除を自動的に行って、風荷重時には下部構造と上部構造とを移動拘束しつつ、地震時には拘束を解除し免震効果を確実に発揮させることができるパッシブ型の振動低減装置を提供する。【解決手段】シリンダー５と、シリンダー５の内部を第１隔室６と第２隔室７に区画するピストン８と、ピストン８に一端を接続してシリンダー５の軸線方向外側に延設されるピストンロッド９と、第１隔室６及び第２隔室７に充填される作動流体１０とを備える。また、通常時及び風荷重作用時に第１隔室６と第２隔室７の間の作動流体１０の流通を阻止し、風荷重よりも大きな振動が作用した時に、第１隔室６と第２隔室７を連通させ、予め設定した所定の反力を超えると減衰係数を減少させる風ロック機構２０を備える。【選択図】図２
PROBLEM TO BE SOLVED: To provide a passive-type vibration reduction device capable of performing an automatic restriction or releasing operation without using any external electrical power, restricting motions of a lower structure and an upper structure under accepting wind load, and releasing the restriction at the time of earthquake to attain a positive isolation effect.SOLUTION: There are provided a cylinder 5; a piston 8 for dividing an inside part of the cylinder 5 into a first cell 6 and a second cell 7; a piston rod 9 having one end connected to the piston 8 and extended to outside in an axial direction of the cylinder 5; and working fluid 10 to be filled in the first cell 6 and the second cell 7. In addition, there is provided a wind lock mechanism 20 for preventing flow of the working fluid 10 between the first cell 6 and the second cell 7 at the time of normal state and action of the wind load, communicating between the first cell 6 and the second cell 7 when a larger vibration than the wind load acts, and reducing attenuation coefficient if it exceeds a predetermined set reaction force.SELECTED DRAWING: Figure 2
【課題】外部電力を使わずに拘束や解除を自動的に行って、風荷重時には下部構造と上部構造とを移動拘束しつつ、地震時には拘束を解除し免震効果を確実に発揮させることができるパッシブ型の振動低減装置を提供する。【解決手段】シリンダー５と、シリンダー５の内部を第１隔室６と第２隔室７に区画するピストン８と、ピストン８に一端を接続してシリンダー５の軸線方向外側に延設されるピストンロッド９と、第１隔室６及び第２隔室７に充填される作動流体１０とを備える。また、通常時及び風荷重作用時に第１隔室６と第２隔室７の間の作動流体１０の流通を阻止し、風荷重よりも大きな振動が作用した時に、第１隔室６と第２隔室７を連通させ、予め設定した所定の反力を超えると減衰係数を減少させる風ロック機構２０を備える。【選択図】図２
VIBRATION REDUCTION DEVICE
振動低減装置
ISODA KAZUHIKO (author)
2018-02-15
Patent
Electronic Resource
Japanese
Vibration reduction device, vibration reduction method and large-span bridge
| European Patent Office | 2020