| 摘要 |
A tunneling machine is described which uses an array of impact tools for cutting a deep kerf that defines the wall of the tunnel. The impact tool provides impact blows through drill steels to which drill bits are attached. A substantial portion of the drill steels extend through webs which provide bearing support and alignment for the drill steels and bits on a dynamic basis while the kerf is being cut and the webs also permit the drill steel to bend; thus providing clearance between the impact tool and the wall of the tunnel. The webs also provide control of the sideways motion of the bit, while at the same time, providing for full impact blows to be delivered to the working face.
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