CONSTRUCTION METHOD AND DESIGN METHOD OF SOUND INSULATION BOUNDARY FLOOR STRUCTURE, AND SOUND INSULATION BOUNDARY FLOOR STRUCTURE OF BUILDING

摘要

PROBLEM TO BE SOLVED: To provide a method of constructing and designing a sound insulation boundary floor structure capable of surely securing boundary floor sound insulation performance against weight impact sound when the sound insulation performance of a boundary floor is improved by the structure in which a floating floor layer is disposed above a floor slab of a building, and a sound insulation boundary floor structure of the building.;SOLUTION: In a sound insulation boundary floor structure to improve sound insulation performance in a floor slab 10 by disposing a floating floor layer 13 via vibration-isolating bearings 12, dimensions, density and bending rigidity are determined so that a natural frequency f of small-divided floor plates 13a - 13c of a floor plate constituting the floating floor layer satisfies a specific calculation formula, and the small-divided floor plates having the determined dimensions, density and bending rigidity are installed. However, assuming that each dimension of the longitudinal length, lateral length, and thickness of the small-divided floor plate is a, b and h (m), and Young's modulus of the floor plate material is E (N/m²) and density is ρ (kg/m³), the natural frequency (minimum value) of the small-divided floor plate is given by a specific calculation formula.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT