DDC pile (in-hole deep dynamic compaction technology) is a proprietary and patented technology of Beijing Ruilitong Foundation Engineering Co., Ltd. This technology has been applied in hundreds of projects and all meet the design requirements. Require. The DDC pile was identified by the Beijing Municipal Construction Committee as "the first in terms of technical level at home and abroad." The Ministry of Construction compiled regulations for DDC pile technology and certified that the DDC pile technology has reached the international advanced level.