Really Research On The Sound Insulation Performance Of Floating Floor Slabs

High-rise residential building,sound insulation is mainly focused on air and structural sound isolation.The current practice of isolating the impact sound is the use of floating floor construction:one method is to set an air layer for structure sound isolation,also put the floor support-stud,the elastic pads placed under stud to weaken the structure sound transmission;another method is called resilient floating floor,the elastic cushion directly placed between the wood floor and the concrete floor.There are few literatures related to resilient layer floating floor.It's also hard to find sound insulation mechanism and the material selection principle of such structure,but there are some measured data for the sound insulation structure of such floating floor.(1).This paper will use the statistical energy analysis theory to study the mechanism of the impact sound beat the floating floor,and explore measures to improve impact sound insulation performance.(2).In this paper,the statistical energy analysis method is used to analyze the impact sound insulation of floating floor.The impact sound noise transmits through the floating floor through the direct path and lateral path.Derive the sound pressure level formulation in the downstairs room including the influence of cushion,wood floor and structure floor.According to the boundary condition of the plate and the wave propagation equation,the sound transmission coefficient of the wood floor-resilient layer-structure floor,wood floor-resilient layer-structure floor-wall are calculated.Comparing the impact sound pressure level of the downstairs with the measured data,it is found that there is a certain discrepancy at low frequency band,but there is a good consistency in most mid-high frequency range.Analyzing the reason of the discrepancy for the theoretical feasibility in the reality applying.(3).Through the analysis of the theoretical formula,the use of resilient layer,structure floor and timber floor will have a certain influence on the impact sound insulation performance.Based on the method of controlling structure parameters,the impact sound pressure level curve of the floating floor is depicted.The measures to improve the impact sound insulation of the floating floor are put forward.