Earth discharging device for upward-facing shield machine

Details Earth discharging device for upward-facing shield machine Earth discharging device for upward-facing shield machine

E - Fixed Constructions

21

D

E21D 9/10 (2006.01) E21D 3/00 (2006.01)

Patent

CA 2397561

An earth discharging device for an upward-facing shield machine includes a vertical pipe to discharge earth and sand excavated by the machine; an elastic film-type valve which opens and closes the interior of the pipe by expanding and contracting by fluid pressure; and a gate mechanism provided toward the outlet side of the pipe than the valve, the gate mechanism for adjusting the sectional area of the space in the pipe and narrowing the sectional area by expanding the valve in response to the gate mechanism's closing a predetermined amount thereby causing pressure in the pipe to rise resulting in uniform pressure so that the valve expands uniformly.

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