400mm or 200mm.

1. In order to ensure that the foundation of the Weigang ps rotary printing press does not sink, the 400mm deep concrete lower layer should be compacted good soil.

2. The foundation part of the Weigang ps rotary printing press is filled with soft soil, so two-step soil with a depth of 150-200mm and a ratio of 2:8 must be dug under the concrete.

3. If the 400mm deep concrete foundation cannot be guaranteed, the minimum depth should not be less than 150-200mm, and mesh steel tiles with a medium length of 10mm and a spacing of 200mm must be laid underneath.