1.

An emergency ladder must be set in the cave. The electric hoists and hanging cages used shall be safe and reliable, and equipped with automatic locking safety devices. Hemp rope and nylon rope shall not be used to lift or push the sidewall flange up and down. Push-button switch should be used for electric hoist, and its safety lifting ability must be checked before use.

2.

Before starting work every day, it is necessary to detect the toxic and harmful gases underground and take adequate safety protection measures. When the excavation depth of hole pile exceeds 10m, there should be special equipment to supply air to the underground, and the air volume should not be less than 25l/s. ..

3.

A guardrail must be set around the orifice, generally a 0.8m enclosure.