Abstract: A shield machine including an excavator capable of excavating tunnels of various cross-sectional shapes, the excavator including: a rotary drum supported at a front end side portion of a shield machine main body to be rotatable around a first center axis; a cutter supporting frame supported by the rotary drum to be rotatable around a second center axis; a rotary cutter head supported by the cutter supporting frame to be rotatable around a third center axis and including a plurality of cutter bits on a surface thereof; a rotary auxiliary cutter head supported by the rotary drum to be rotatable around a fourth center axis; and first, third, and fourth rotating mechanisms, and a swinging drive mechanism configured to respectively cause the rotary drum, the rotary cutter head, the rotary auxiliary cutter head, and the cutter supporting frame to independently rotate.

Abstract: The present invention provides a shield machine (1) including an excavator (5) capable of excavating tunnels of various cross-sectional shapes, the excavator (5) including: a rotary drum (40) supported at a front end side portion of a shield machine main body (2) to be rotatable around a first center axis (A1); a cutter supporting frame (50) supported by the rotary drum to be rotatable around a second center axis (A2); a rotary cutter head (60) supported by the cutter supporting frame (50) to be rotatable around a third center axis (A3) and including a plurality of cutter bits (61) on a surface thereof; a rotary auxiliary cutter head (70) supported by the rotary drum (40) to be rotatable around a fourth center axis (A4); and first, third, and fourth rotating mechanisms (45, 65, and 75), and a swinging drive mechanism (55) configured to respectively cause the rotary drum (40), the rotary cutter head (60), the rotary auxiliary cutter head (70), and the cutter supporting frame (50) to independently rotate.