Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1987-12-29
1989-07-11
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405138, 405141, E21D 912
Patent
active
048466069
ABSTRACT:
An excavated earth and sand transporting apparatus for use in a shield machine for carrying the earth and sand excavated by a cutter head mounted on the most front part of a shield proper through a screw conveyor followed by a transporting pipe to rearward of the shield proper. The excavated earth and sand transporting apparatus has an excavation discharging device mounted between the screw conveyor and the transporting pipe to discharge the earth and sand or the excavation conveyed by the screw conveyor into the transporting pipe while keeping a predetermined earth pressure inside the cutter head chamber so that the spouting of spring water can be prevented without having to use a bentonite slurry and/or a clay slurry and that the excavated earth and sand or excavation can be discharged efficiently and effectively.
REFERENCES:
patent: 1999419 (1935-04-01), Mercier
patent: 3350889 (1967-11-01), Sturm
patent: 3410098 (1968-11-01), Winberg
patent: 3561223 (1971-02-01), Tabor
patent: 4286935 (1981-09-01), Okuno et al.
patent: 4456304 (1984-06-01), Yoshikawa et al.
Kabushiki Kaisha Komatsu Seisakusho
Taylor Dennis L.
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