Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1988-02-18
1989-07-18
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405141, 299 33, 299 56, 299 58, E21D 908
Patent
active
048489638
ABSTRACT:
The earth pressure shield for a tunnel and/or gallery excavator has a front working compartment formed by a separating wall having a digging tool and an annular reinforcing space substantially triangular in cross section positioned directly in front of the separating wall. So that an extensive restructuring of the machine is not necessary when moving from soft earth to hard ground, the annular reinforcing space is provided with a lower fluid feeder, a controlled upper pressurized air feeder, a plurality of fluid conductor pipes which are guided from below to an upper fluid outlet opening into the working compartment, and a fluid level controller. The invention is based on the consideration that a reliable and satisfactory support of the local front wall is only possible when the local front wall in the vicinity of the roof can be supplied with a fluid.
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Babendererde Siegmund
Braach Otto
Flunker Hans-Jurgen
Wittneben Gert
Dubno Herbert
Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann
Olsen Arlen L.
Taylor Dennis L.
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