What does rigid pipe pile mean?

A composite carrier combining cement-soil mixing pile and prestressed pipe pile. The construction technology of rigid composite pile is suitable for peat soil, organic soil, soil with pH less than 4 and clay with plasticity index greater than 25. Rigid composite pile is a composite carrier which combines cement-soil mixing pile and prestressed pipe pile (uplift square pile). The composite pile has larger friction surface, so it has greater compressive strength (uplift strength). Companies with rigid composite pile technology include Jiangsu Yang Tai Zhongtian Pipe Pile Co., Ltd. and Hubei Dingtegu Construction Engineering Co., Ltd. ..