1. Use wood blocks or rubber pads: put some wood blocks or rubber pads at the bottom of waste oil drums to effectively reduce the impact of uneven cement floor on oil drums.

2. Use foam filler: Fill some foam filler at the bottom of the waste oil drum to play a buffering role and reduce the impact of uneven cement floor on the oil drum.

3. Use adhesive tape: Wrap some adhesive tape around the bottom of the waste oil drum, which can fix the oil drum on the cement floor and reduce the possibility of the oil drum moving.

4. Use support frame: design a support frame suitable for waste oil drums, and put the oil drums on the support frame to avoid the influence of uneven cement floor on the oil drums.