| 摘要 |
Described herein is a bit ( 9 ) for excavation and compaction equipment ( 1 ) for erecting piles, the bit ( 9 ) being provided with a central body ( 21 ), an excavation screw ( 24 ) fixed to the central body ( 21 ), and a dislocating element ( 40 ) for compaction of the walls of the excavation, a retention device ( 25 ) that can be selectively re-closed being associated to the central body ( 21 ) for preventing fall of debris beyond a leading edge ( 27 ) of the screw ( 24 ) during extraction of the bit ( 9 ), and the dislocating element ( 40 ) being mounted on a fixed portion ( 28 ) of the retention device ( 25 ), and presenting a radial development, which decreases with respect to a rotation of excavation of the excavation screw ( 24 ) for compaction of the walls ( 3 a) of the excavation ( 3 ) during extraction of the bit ( 9 ).
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