Problem to be solved: to provide a parabolic shield tunneling machine capable of adjusting the position of the child head cutter head without increasing the scale of the work when the child shields are separated.This parent shield shield excavator 100 isA parent shield machine 101 including a parent machine cutter head 11 andA child shield device 102 disposed in the parent shielded device 101 is provided before the separation startChild shield machine 102A cylindrical fuselage 2 provided in the inner peripheral side of the partition wall 2a extending in the direction perpendicular to the excavation directionCutter head 4A child machine drive source different from the main unit cutter head 11 for rotating the child cutter cutter headAn excavation mechanism 3 having a child head cutter head support part 5 for supporting a child cutter cutter head 4 is provided.When separating the child shield machineBy moving the excavation mechanism 3 to the fuselage 2The position of the excavation mechanism 3 in the direction perpendicular to the excavation direction can be adjusted.Diagram
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