Shield tunneling machine

Details Shield tunneling machine Shield tunneling machine

1985-09-18

1986-12-23

Leppink, James A.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

With mine roof-supporting means

299 56, 299 85, 299 86, 299 71, 299 90, 175336, E21D 908, E21D 2303

Patent

active

046308695

ABSTRACT:
A shield tunneling machine comprises a tubular shield body, a partition wall provided in the shield body, a rotary shaft supported rotatably by the partition wall and extending longitudinally of the shield body, a cutter head disposed on the front end of the rotary shaft and a mechanism for rotating the cutter head through the rotary shaft. The cutter head comprises a first cutter provided with a plurality of cutter bits and a second cutter provided with a plurality of roller bits. The machine also comprises a mechanism for moving straight forward and backward one of the first and second cutters relative to the other. The machine locates the first cutter more forward than the second cutter for excavating the face of stratum having a soft layer like clay layer with the first cutter and the second cutter more forward than the first cutter for excavating the face of the stratum having a hard layer like bedrock layer with the second cutter.

REFERENCES:
patent: 2811341 (1957-10-01), Robbins
patent: 2837325 (1958-06-01), Biedess
patent: 3437380 (1969-04-01), Lawrence
patent: 3511539 (1970-05-01), Schonfeld
patent: 3917351 (1975-11-01), Pirrie et al.
patent: 4311344 (1982-01-01), Akesaka

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