2, laying floor damping pad, flat on the ground, and rolled up about 30mm at the corner, joint position to splicing tightly;
3, laying sound insulation felt, flat on the floor damping pad, staggered laying with the floor damping pad, rolled up at the corner of the room for about 20mm, and seam pressing treatment;
4. Laying steel bars;
5. Pouring C20 fine stone mortar concrete.
Secondly, the sound insulation treatment of the wall, in order to ensure the sound insulation effect, the specific construction methods of the wall are as follows:
1, laying sound-proof felt along the wall, and caulking;
2. Install the vibration-damping keel, and wedge about 600mm to fill the gaps in the keel with cotton absorbent;
3. Install the sound insulation board on the vibration damping keel (the sound insulation felt is sandwiched between two layers of plates, and the plates are staggered with the sound insulation felt).
4. Install C 100 light steel keel on the sound insulation board, put a layer of sound insulation felt on the nails inside the keel to avoid rigid connection, and fill two layers of sound-absorbing cotton with bulk density of 40 and 35 in the gaps of the keel.
5. Install the sound insulation board on the keel (the sound insulation felt is sandwiched between two layers of plates, and the plates and the sound insulation felt are staggered). Joints between sound insulation boards and joints between sound insulation boards and roofs and floors are sealed with building sealant.