Abstract: A sound insulating floor structure comprises an underlying floor layer of a raised floor constructed by supporting a plurality of underlying floor panels at a predetermined height by means of a group of supporting legs installed on a foundation floor via elastic pedestals attached to the lower ends of the supporting legs, floor covering materials laid over the underlying floor layer, and intermediate materials laid between the underlying floor layer and the floor covering materials. The intermediate material is a hardboard or a high density fiberboard having the flexural strength of 35-50 [N/mm2], Young's modulus in flexure of 4,000-5,000 [N/mm2] and the density of 0.8-1.2 [g/cm3].

Abstract: A sound insulating floor structure comprises an underlying floor layer of a raised floor constructed by supporting a plurality of underlying floor panels at a predetermined height by means of a group of supporting legs installed on a foundation floor via elastic pedestals attached to the lower ends of the supporting legs, floor covering materials laid over the underlying floor layer, and intermediate materials laid between the underlying floor layer and the floor covering materials. The intermediate material is a hardboard or a high density fiberboard having the flexural strength of 35-50 [N/mm2], Young's modulus in flexure of 4,000-5,000 [N/mm2] and the density of 0.8-1.2 [g/cm3].

Abstract: A noise suppressor for reducing propagation of a floor impact noise generated in an upper story to a lower story in a multi-storied building is disclosed. A reference sensor set at a position between a floor of the upper story and a ceiling of the lower story detects a floor impact noise generated in the upper story and converts the noise to an electric signal. This signal is computed and processed by a control unit and transmitted to a speaker located at a position lower than the reference sensor. The speaker emitts a sound wave interfering the floor impact noise to eliminate the noise. The noise not having been suppressed is detected by an error sensor and processed together with the noise detected by the reference sensor by the control unit, thus a sound wave to be emitted from the speaker is corrected appropriately.

Abstract: A method of assembling a raised dry-floor wherein floor panels are laid by using in combination a group of unit supporting legs each comprised of a rod-shaped leg member and a supporting plate mounted on the upper end of the rod-shaped leg member in such a manner that it may be moved up and down to adjust the level thereof, and a group of square and/or rectangular floor panels. The method comprises the steps of disposing a plurality of unit supporting legs on the surface of a foundation floor at prescribed pitches corresponding to the configuration of the floor panels, disposing a plurality of floor panels leaving prescribed gaps therebetween in such a manner that they may be supported at their marginal portions by the unit supporting legs, and then disposing a gap bridging member in each of the gap portions between the floor panels. The levels of the floor panels can be set even by adjusting the supporting plates of the unit supporting legs, after the floor panels are laid.