Hydraulic control systems for and methods of controlling the ope

Details Hydraulic control systems for and methods of controlling the ope Hydraulic control systems for and methods of controlling the ope

1981-07-08

1983-07-05

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

405138, E21D 1100

Patent

active

043915531

ABSTRACT:
A hydraulic control system serves to control the operation of hydraulic rams used to position and displace an annular member which delimits a concrete reception space disposed at the rear of a tunnel-driving apparatus. The system acts to compensate for irregular loading on the annular member to ensure the latter is drawn up behind a forward drive shield without twisting or tilting. The rams are divided into groups each connectible to its own pump unit and the system connects the chambers of the rams which reduce in volume as the member is drawn up to the pump units in a manner such that the latter act as brake motors to restrain the member against the concrete pressure differential on its rear side.

REFERENCES:
patent: 2466709 (1949-04-01), Karr
patent: 3372553 (1968-03-01), Samoilov et al.
patent: 4147453 (1979-04-01), Unger et al.
patent: 4224004 (1980-09-01), Heitkamp

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