Shield tunneling machine with eccentricity accommodating...

Details Shield tunneling machine with eccentricity accommodating... Shield tunneling machine with eccentricity accommodating...

E - Fixed Constructions

21

D

262/54

E21D 9/06 (2006.01) E21B 7/20 (2006.01)

Patent

CA 1324619

ABSTRACT OF THE DISCLOSURE A shield tunneling machine comprises a shield body, a rotor disposed in a front portion of the shield body, support means provided behind the rotor in the shield body and for supporting the rotor to be eccentrically movable around the center axis of the shield body, drive means for moving the rotor eccentrically and seal means disposed between the support means and the rotor. The seal means is provided with an annular recess provided around the center axis in a portion where one of the support means and rotor faces the other and opened to the other of the support means and rotor, a ring disposed in the recess to be movable in the direction of the center axis and having a generally constant outer diameter and a spring for pressing the ring toward the other of the support means and rotor. The diameter D1 of the ring, the maximum diameter D2 of the contact portion between the ring and the other of the support means and the rotor and the eccentricity e of the eccentric movement have the following relationship; D1 ? D2 - 2e.

573098

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