Drive shield

Details Drive shield Drive shield

1978-02-07

1979-03-13

Shapiro, Jacob

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

E21D 1900

Patent

active

041435192

ABSTRACT:
A drive shield for driving wide underground cavities comprises a plurality of knife shields arranged side-by-side transversely of the direction of advance. Each knife shield has a plurality of elongate knives displaceably mounted on a respective support frame. The elongate knives are advanceable relative to their support frame by means of hydraulic rams mounted on that support frame. The support frames of each pair of adjacent knife shields are linked by connecting means such as double-acting hydraulic rams, which permit one of the support frames to be advanced relative to the other.

REFERENCES:
patent: 4063425 (1977-12-01), Jutte

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