E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
262/51
E21D 9/08 (2006.01) E21D 9/13 (2006.01) E21D 9/06 (2006.01)
Patent
CA 1173465
ABSTRACT: SHIELD TUNNELING METHOD AND MACHINE THEREFOR 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 (24,1241 allowing the passing of the muck there- through, 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 predeter- mined level, and a muck chamber provided behind the diaphragm and usually charged with a liquid.
379928
Kabushiki Kaisha Iseki Kaihatsu Koki
Ridout & Maybee Llp
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