Shield type tunneling machine

Details Shield type tunneling machine Shield type tunneling machine

1985-09-26

1987-09-08

Corbin, David H.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

299 33, 299 58, E21D 908

Patent

active

046920625

ABSTRACT:
A shield-type tunneling machine comprises a shield body having a front portion converging gradually rearward, a crankshaft journalled rotatably by a diaphragm provided in the shield body, a drive mechanism connected to an end of the crankshaft and a conical or frustoconical rotary head supported rotatably by the other end and disposed in the front portion of the shield body to be turned eccentrically, a gear mechanism for forcibly rotate the rotary head and a means for discharging debris from a front area of the diaphragm to a rear area. The tunneling machine, when thrusted in the ground by a jack, receives earth and sand into the front portion of the shield body and compresses them between the rotary head and the shield body to send them to the rear. The machine can be used for a pipe jacking as well as the tunneling in the soft ground.

REFERENCES:
patent: 3334945 (1967-08-01), Bartlett
patent: 3830545 (1974-08-01), Sugden
patent: 4171848 (1979-10-01), Ono
patent: 4298230 (1981-11-01), Krabbe
patent: 4406498 (1983-09-01), Akesaka

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