1. Drilling: press the scaffold board and the protective pole frame at the corresponding position of drilling, then place the cooling drill bit, and then start drilling with a drill bit with an outer diameter of 1 10 mm and a drilling depth greater than 300 mm. When drilling, it is necessary to send water to the drill bit to cool it.
2. Install the plastic sleeve: stick the plastic sleeve and the hole cover together with plastic glue, and clean the dust in the hole, and pay attention to keep the hole dry. Then, the back of the hole cover is filled with waterproof glue, and the plastic sleeve is inserted from the outside to the inside.
3. Air conditioning tunnel sealing: inject foam sealant into the glue gun and then into the gap between the plastic sleeve and the wall. When the sealant is completely cured, remove the foam sealant beyond the wall, and then apply gray mortar.