Excavation machine

摘要

An excavation machine having a cutter head with a large diameter while making it possible to excavate excavation objects such as hard bedrock etc. with high efficiency is provided. The excavation machine comprises an outer circumference cutter head 20 having a circular opening and being rotated and contacted to excavation objects and a small diameter cutter head 23 disposed in the opening and rotatable independently from the outer circumference cutter head. Rotation centers of the rotation disk and the rotation plate are gapped and the gap is shorter than a rotation radius of the small diameter cutter head.

主权项

1. An excavation machine for digging a tunnel comprising:
a circular rotation disk having a circular opening, the rotation disk being rotated and contacted to an excavation object; a rotation plate disposed in the opening and rotatable independently from the circular rotation disk; and a plurality of cutter members protruding from and disposed on one face of the circular rotation disk and the rotation plate for cutting the excavation object by the rotation of the rotation disk and the rotation plate; wherein rotation centers of the rotation disk and the rotation plate are gapped and a gap therebetween is shorter than a rotation radius of the rotation plate.