Shield tunnelling machine

Details Shield tunnelling machine Shield tunnelling machine

E - Fixed Constructions

21

D

262/54

E21D 9/08 (2006.01) E21D 9/10 (2006.01)

Patent

CA 2028659

A shield tunnelling machine comprises a cylindrical shield body, a rotary cutter head disposed on a front end of the shield body and provided with a face plate having one or a plurality of slits extending in the radial direction, an intermediate support member for supporting a plurality of cutter bits respectively having forward bit portions and backward bit portions in each of the slits, means for supporting the intermediate support member swingably around an axis extending in the radial direction, and a member for movably guiding the support means in the axial direction of the shield body, and means 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.

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