The auto-march-extruding perforator in soil stratum is an equipment for geotechnical construction

which has a shape as a shell. The perforator extrudes and passes through the soil stratum

then a hole is made. The perforation diameter

speed as well as the power supply required are closely related to physical and mechanical properties of soil stratum. In this paper

the design principles

structures and applications of the perforator. The engineering applications showed that this perforator has many advantages

for examples

simple in structure and operation

applicable for various kinds of soil stratum.