Method and apparatus for thrusting a shield for use in...

Details Method and apparatus for thrusting a shield for use in... Method and apparatus for thrusting a shield for use in...

E - Fixed Constructions

21

D

61/78

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

Patent

CA 1220640

ABSTRACT OF THE DISCLOSURE There is provided a new and useful apparatus for tunneling a shield comprising an eccentric collar supported rotatably by a partition wall extending across the interior of a shield body, the eccentric collar being connected to a first drive mechanism; a crank shaft connected to a second drive mechanism and a conical or frustoconical rotary head supported rotatably by an opposite end portion of the crank shaft; the eccentric collar being provided to rotate the crank shaft eccentrically with respect to the shield to provide a space for the shield by compacting ground disposed ahead of the rotary head whereby as the shield is advanced into the space a protective zone is formed around the shield.

451378

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