Sound insulation floor with micro-foaming plate as sound insulation cushion layer and construction method of sound insulation floor

The invention discloses a sound insulation floor with a micro-foaming plate as a sound insulation cushion layer. The sound insulation floor is composed of a reinforced-concrete-structure floor body, the micro-foaming plate sound insulation cushion layer, a cement mortar protecting layer and a surface layer material in an overlapping mode. The reinforced-concrete-structure floor body serves as the base layer, the micro-foaming plate sound insulation cushion layer and the cement mortar protecting layer serve as the middle layer, the cement mortar protecting layer is located on the micro-foaming plate sound insulation cushion layer, and the surface layer material serves as the upper layer. The invention further discloses a construction method of the sound insulation floor. The method includes the steps of firstly, cleaning the reinforced-concrete-structure floor body serving as the base layer to ensure the flatness of the base layer; secondly, laying the micro-foaming plate sound insulation cushion layer; finally, laying the dry and hard cement mortar protecting layer and the surface layer material on the micro-foaming plate sound insulation cushion layer. According to the sound insulation floor, the defect that a traditional floating sound insulation floor needs an armored concrete protecting layer 40 mm to 50 mm thick is overcome; the sound insulation floor is small in thickness, light in weight, resistant to moisture and mould and free of pollution, the sound insulation improving amount of crashing sound ranges from about 8 dB to 20 dB, and the requirement of housing construction for sound insulation is met. Meanwhile, the sound insulation floor of the structure can be constructed without any special construction machine or tool, laying can be quite conveniently conducted, and the sound insulation floor is economical and remarkable in effect.