1. Understand the schematic diagram of each hole position before drilling, understand the structure and internal and external conditions of the house;
2. Clearly mark each hole position and observe the direction of the water and electricity pipelines;
3. Punch holes on both sides of the beam as much as possible, with minimal stress on both sides;
4. Punch holes as much as possible on beams with walls below;
5. Try to punch holes at the top of the beam as much as possible, with less stress on the top;
6. Make small holes on the beam as much as possible;
7. The height of the beam is 20 centimeters and no upper or lower holes are allowed; It is strictly prohibited to drill holes at the bottom five centimeters of the beam. Usually, there is a main reinforcement three centimeters below the beam, and it is strictly prohibited to hit the main reinforcement.
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