FIELD: trenchless pipe laying in ground. SUBSTANCE: device has cutter section, hollow expander, radial ribs and feed mechanism. Expander is installed coaxially with annular clearance inside cutter section. Ribs are rigidly connected with expander and cutter section. Feed mechanism is made in form of main gas generator with nozzle block and additional gas generators with nozzle blocks. Main gas generator is located in inner space of expander. Additional gas generators are located in respective housings. Housing of each additional gas generator is located inside cutter section and rigidly connected to the latter. Longitudinal symmetry axis of housing of each additional gas generator runs through longitudinal axis of symmetry of respective radial rib. EFFECT: higher efficiency. 20 cl, 7 dwg
