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Abstract

An excavator for underground excavating arranged to perform excavating work with low vibration and low noise. A rotary excavator and an underground excavating method are also provided. The excavator (1) for underground excavating comprises a plurality of bits (42a, . . . ) having the outside diameter smaller than that of the excavator body (2) and advancing/retracting to/from the excavating side, piston case members (22b, . . . ) incorporating pistons (61) for applying a hitting force to respective bits (42a, . . . ) by the energy of working fluid, a section (30) for storing the working fluid being fed to respective piston case members (22b, . . . ), working fluid circulation passages (352) for allowing the working fluid being fed to respective piston case members (22b, . . . ) to pass, and a body of rotation (40) provided with a plurality of holes (4a, . . . ) for allowing the fluid storage section (30) to communicate with the circulation openings (3a, . . . ) of each working fluid circulation passage (352) in order to feed the working fluid from the fluid storage section (30) to the circulation openings (3a, . . . ) of the respective working fluid circulation passages (352).

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First Claim