Tunnel drive shield

Details Tunnel drive shield Tunnel drive shield

1982-07-26

1984-10-02

Corbin, David H.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

405145, E21D 906

Patent

active

044744943

ABSTRACT:
A tunnel drive shield has a front shield and a rear shield. The front shield is a knife shield, and the rear shield has a hood and a plurality of elongate members. The hood is connected to the front shield so as to be movable in all directions. Between the hood and the front shield (or the support frame for the knives of the front shield) is provided means for holding the two shields at a given angular setting. The connection between the two shields enables them to be angled relatively to each other to a limited extent in all directions, so that the original length of the entire drive shield is shortened, and the ability of the shield to negotiate curves is increased.

REFERENCES:
patent: 3919851 (1975-11-01), Plourde
patent: 3926005 (1975-12-01), Foik
patent: 4022029 (1977-05-01), Jutte et al.
patent: 4118938 (1978-10-01), Unger et al.
patent: 4120165 (1978-10-01), Stuckmann et al.
patent: 4252463 (1981-02-01), Klysz

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