Shield-type tunneling machine

Details Shield-type tunneling machine Shield-type tunneling machine

E - Fixed Constructions

21

C

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E21C 25/18 (2006.01) E21D 9/06 (2006.01) E21D 9/08 (2006.01) E21D 9/10 (2006.01) E21D 9/11 (2006.01)

Patent

CA 1122621

ABSTRACT OF THE DISCLOSURE In a shield-type tunneling machine, a pair of comb-type bit-plates are pivotally supported on a peripheral wall of each cutter slit provided in a cutter disc. In order to adjust a degree of opening of each slit as well as a cutting angle of the bits with respect to the facing, the bit plates are pivotally moved to an open position or a close position for opening or closing each slit, in association with the reciprocating motion of a slide shaft disposed in a hollow drive shaft which rotates the cutter disc.

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