Abstract：
The Republic of Congo, Brazzaville Business Center is located in the plane of soft soil and hard rock cross distribution of vertical pieces of fine grained soil and cemented rock alternating layer of non-uniform distribution of complex structure pile foundation, through which, and the equipment capacity is limited. The improvement of reverse circulation drilling technology can meet the requirements of the pile foundation and the quality of the pile foundation. That is the drilling device with large power reverse circulation drill, through general soil with enhanced drill through hard rock with rock bit.
ZHANG Wu1,MA Tie-shan2,YAO Xiao-xu1 et al. Equipment selection and pore forming technology of bored pile in soil and rock foundation[J]. Architecture Technology, 2018, 49(4): 436-.
