Tunnel drive shield

Details Tunnel drive shield Tunnel drive shield

1977-04-08

1978-10-31

Shapiro, Jacob

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

299 31, 405143, E01G 302

Patent

active

041226836

ABSTRACT:
A tunnel drive shield is provided with a plurality of bracing units spaced around its periphery. The bracing units are expansible against the surrounding tunnel wall to control the direction of shield advance. A bracing unit is provided in each of the four shield quadrants defined by the vertical and horizontal center planes of the shield. Each of the bracing units is expansible in a non-radial direction.

REFERENCES:
patent: 3382002 (1968-05-01), Tabor
patent: 3630574 (1971-12-01), Cox et al.
patent: 3870368 (1975-03-01), Winberg et al.
patent: 3967463 (1976-07-01), Grandori

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