| 摘要 |
The invention is a new boring head (T) for boring machines, with coupling s or drive units (Tl, T2) for the rotation-translation of at least one borin g rod and of at least one covering tube that are coaxial and hollow to allow the passage of pressurized water/air and the upward flow of the waste fluid consisting of water/air mixed with debris along the interspace defined betw een said rod and said covering tube, comprising a protection screen or wall (Cp) completely enveloping said rod and said covering tube, suited to be pos itioned near or at the level of the upper annular opening of said interspace , out of which said waste fluid flows, in such as way as to intercept said w aste fluid in all directions and to convey it downwards.
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