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AssigneesTaisei Corporation, Ishikawajima-Harima Heavy Industries Co., Ltd.
InventorsHiroyuki Itou, Yuuichi Asai, Osamu Takagi, Kazuo Takamizawa, Fumio Kondou, Hidetoshi Sakamoto
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An earth discharging device, for a shield machine for constructing a tunnel in the vertical direction, has a pipe for discharging downwardly earth and sand that have been excavated by the machine as it advances upwardly. An elastic film-type valve is provided in the earth discharging pipe, which valve expands and contracts diametrically by means of fluid pressure to open and close the interior of the earth discharging pipe. A gate mechanism follows the elastic valve and adjusts the sectional area of the space through which earth and sand pass inside of the earth discharging pipe. The gate mechanism narrows the sectional area of the earth discharging pipe at the outlet side of the elastic valve so as to create a substantially uniform earth pressure upon the entire elastic valve to inhibit blockages and eruptions that might otherwise occur.
An earth discharging device for an upward-facing shield machine comprising:
An earth discharging device for an upward-facing shield machine comprising:
A method for discharging downward earth and sand excavated by an upward-facing shield machine that advances upward, wherein, when the sectional area of a space through which earth and sand pass in the interior of an earth discharging pipe disposed in a longitudinal direction is narrowed by an elastic film-type valve which expands diametrically due to fluid pressure, the sectional area of a space through which earth and sand pass in the interior of a section of the earth discharging pipe which is downstream of said elastic film-type valve is adjusted by a gate mechanism, whereby the earth and sand which are downstream of said elastic film-type valve are slightly blocked so as to raise the earth pressure of said earth and sand.
Dependencies are inferred from the claim text.