Shield machine

Details Shield machine Shield machine

1983-11-22

1985-12-17

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Stepper-type advance-causing means

299 33, 299 56, 405146, 405141, 405147, 405150, F21C 2902

Patent

active

045589062

ABSTRACT:
A shield machine for enlarging a portion of an existing tunnel includes an inner and outer double cylinder shaped shield machine body with a cylindrical outer shield portion and a cylindrical inner guide portion designed to be driven in an axial direction of an existing tunnel and along an outer circumferential surface of primary assembly segments lining the existing tunnel. Jack members are provided for pushing forward the shield machine body by receiving a reaction from a reaction member such as secondary assembly segments lining a constructed enlarged tunnel. A scraper member is positioned adjacent to the inner guide portion for removing a back-filling agent on the outer surface of the primary assembly segments.

REFERENCES:
patent: 727799 (1903-05-01), Hough
patent: 1296312 (1919-03-01), O'Rourke
patent: 3410098 (1968-11-01), Winberg
patent: 3494136 (1970-02-01), Wilms
patent: 3698768 (1972-10-01), Delli-Gatti
patent: 3830545 (1974-08-01), Sugden
Publication entitled, "Explanation of Shield Driving Process for Enlargement," Jul., 1982, Kensetsu & Kaisha.

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