How does the tunnel drilling machine work?
A shield tunneling machine having a parallel-connected excavator comprising a plurality of tunnel surface tools consisting of a tool spokes, a plurality of excavation tools divided into a plurality of stages and consisting of a tool spokes,
Means connected to each of the actuators for independently adjusting the excess excavation rate of the excessive excavation tool at each level.
A cutting bit mounted on each of the mutually spaced tunneling tool and the excess digging tool, a plurality of actuators connected to the excess digging tool at each stage for moving the tool toward or away from the excessive excavation position, and
