An anti-earthquake structure insulating the kinetic energy of earthquake from buildings, which is constructed between a building and the construction site thereof, including a plurality of supporting layers having multiple ball seats, plural ball members correspondingly disposed on and pressed between said ball seats with extremely small rolling friction thereagainst, and a plurality of sliding block linkages disposed between the building and the supporting layers, whereby horizontal displacement of the construction site can apply no horizontal force to the supporting layers, and consequently, the building will remain stable and rigid, the sliding block linkages further converting vertical wobbling force into horizontal force, permitting the horizontal force to be absorbed by multiple buffer springs via lever devices.

A seismic isolator has a sliding plate fixed on the lower surface of a building, a connecting plate underlying the sliding plate, an elastic first support disposed between the connecting plate and a foundation of the building to support the building, a second support disposed between the connecting plate and the foundation and urged by a biasing force of a spring member such that its upper end is brought into tight contact with the lower surface of the connecting plate, and a jack for adjusting the biasing force of the spring member. A frictional force acting between the sliding plate and the connecting plate is larger than that between the connecting plate and the upper end of the second support.

A sound insulating device having a shock absorbing mechanism put between an upper material and a lower material, for absorbing vibrational impact sounds wherein the shock absorbing mechanism comprises a spring mechanism that elastically deforms under the effect of an impact load thereby absorbing vibrational impact sounds, and a shock absorber disposed between the spring mechanism and the upper material or the lower material, the shock absorber having a weakened portion that deforms elastically prior to the elastic deformation of the spring mechanism. Vibrational light weight impact sounds as well as vibrational heavy weight impact sounds can be absorbed by absorbing the vibrational light weight impact sounds by the elastic deformation of the weakened portion, without deteriorating the habitability.

A liquid support system for separating a building structure from its supporting foundation wall includes a trough-like member extending around the top surface of the foundation wall, an inverted U-shaped slide member slideably disposed over the trough member and a flexible but non-expandable liquid-filled conduit seated in the channel confined between the trough member and the slide member such that the weight of the building structure can be supported by the liquid-filled conduit. The conduit is divided into segments which can be separated into various sections whereby various sections can be maintained under higher liquid pressure than other segments to support the heavier portions of the building structure.

A floor vibration-damping apparatus damps a horizontal vibration of a floor based on an earthquake or the like. This apparatus comprises a movable supporting portion for supporting a floor structure with being free to move horizontally, and a damper working portion provided between said floor structure and a fixed floor.