BORING MACHINE FOR UPDATING EXISTING BURIED PIPELINE, MILLING CUTTER USED FOR IT, AND BORING METHOD IN UPDATING EXISTING BURIED PIPELINE

摘要

PROBLEM TO BE SOLVED: To perform boring smoothly and surely without resulting in boring failure. SOLUTION: A preceding body 1B that advances the inside of an existing pipeline P1 while being pushed back by the boring force of a boring machine body 1A in front of the boring machine body 1A is connected to the boring machine body 1A for cutting and boring the existing buried pipeline P1, and the preceding body 1B is constituted so as to move for the boring machine body 1A by following the bend of the existing pipeline P1.