| 摘要 |
PROBLEM TO BE SOLVED: To simply, safely and efficiently provide a shield machine and its bit exchange method in underground. SOLUTION: A circling movable chain 15a is provided by directing the front side and rear face side of a cutter head 2 in the substantially radial direction on the shield machine 1 provided with the rotating cutter head 2 contacted on a heading, and bits 14, 14... are provided in the form of a row on the chain 15a along a circumferential direction. In addition, a lock chamber 33 capable of exchanging rear face side bits 12, 12... of the cutter head 2 is provided by entering the inside of an excavation chamber 36 provided rearward of the cutter head 2 to be adhered to the rear face of the cutter head 2. COPYRIGHT: (C)2003,JPO |
