UNDERGROUND PIPELINE CONSTRUCTING METHOD AND PROPULSION EXCAVATING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an underground pipeline constructing method and a propulsion excavating device capable of safely construct a long-distance pipeline in a short construction period. SOLUTION: A cutter 3 having a plurality of bits 3a on the front face and expandable in the radial direction is rotatably provided at the tip of a tubular outer shell 2, and a drive device 4 rotating the cutter 3 is provided in the outer shell 2. A tubular connecting pipe 5 is longitudinally slidably provided on the outer shell 2, a tubular propulsion pipe 20 is arranged at the rear end of the outer shell 2, the propulsion pipe 20 is pushed from behind, and an excavation is performed while the pipeline is formed.