| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein although the demand toward a comparatively small-diameter micro tunnel boring has been increased recently, an efficiently boring apparatus is not available and it is difficult to improve work efficiency, which results from a fact that since the micro tunnel has a small diameter, there is no internal space for boring devices, so it is difficult to incorporate a device for effectively crushing stones and pebble. SOLUTION: A crushing rotor 4, which is substantially and provided with a disc bit 6 formed on the outer peripheral edge and a button bit 8 fixed to the outer peripheral surface, is cantilever-like supported on the end face 2 on the front side of a cylindrical excavator body 1 with the disc bit 6 projected a little outward from the outer periphery of the excavator body 1 and with a rotating axis 9 thereof inclined inward to point obliquely the front of the axis 10 of the excavator body 1. COPYRIGHT: (C)2004,JPO&NCIPI
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