Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent
1981-06-09
1983-09-27
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Stabilizing underground structure
299 18, 299 33, 405144, E21D 908
Patent
active
044064985
ABSTRACT:
A method for excavating a tunnel wherein the muck from the tunnel face is admitted into the shield; the muck is pressed by a pressure of a predetermined level higher than an active earth pressure in the face and lower than a passive earth pressure as the shield body is moved forward, thereby establishing the balance between the earth pressure in the face ground and the muck pressure; and a liquid of a level balancing the underground water pressure is used to resist the underground water, thereby preventing movement of the underground water, whereby the face is maintained stable; and when the muck pressure is raised over the predetermined level, the muck is discharged out of the shield. A shield tunneling machine embodying the above described method comprises a cutter head (24,124) allowing the passing of the muck therethrough, a diaphragm (14,114) provided in the shield body (10,110), a muck inlet (16,116) provided in the diaphragm, a cover member (50,148,149) adapted to open and close the muck inlet and coupled to an operating means (52,160) presetting the muck pressure at the aforesaid predetermined level, and a muck chamber provided behind the diaphragm and usually charged with a liquid.
REFERENCES:
patent: 1720195 (1929-07-01), App
patent: 3378305 (1968-04-01), Geldmacher et al.
patent: 3561223 (1971-02-01), Tabor
patent: 3743356 (1973-07-01), Sheets
patent: 4068484 (1978-01-01), Iwamitu et al.
patent: 4298230 (1981-11-01), Krabbe
Kabushiki Kaisha Iseki Kaihatsu Koki
Purser Ernest R.
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