FIG. 2 is a side view of one embodiment of the tunnel boring system. The cutting
head 210 is attached to the cutting
assembly 220. The cutting
head 210 includes torches and nozzles for a stream of air and/or water, to assist with the boring. The power, and air/water are fed to cutting
assembly 220 via
umbilicals 245.
In one embodiment, a non-transferred Arc Plasma Torch (APT) from PYPROGENSIS™ is used.