Shield tunneling machine.

摘要

A shield tunnelling machine comprises a cylindrical shield body (10), a rotary cutter head (12) disposed on a front end of the shield body and provided with a face plate (20) having one or a plurality of slits (28) extending in the radial direction, an intermediate support member (22) for supporting a plurality of cutter bits (38) respectively having forward bit portions (39a) and backward bit portions (39b) in each ofthe slits, means (24) for supporting the intermediate support member swingably around an axis extending in the radial direction, and a member (26) for movably guiding the support means in the axial direction of the shield body, and means (48) for moving the support means in the axial direction of the shield body to move the cutter bits toward and away from the front face of the face plate, the face plate and the guide member sharing the excavation reaction of the cutter bits.