Shield tunnelling apparatus

Details Shield tunnelling apparatus Shield tunnelling apparatus

1991-03-28

1992-10-20

Taylor, Dennis L.

Hydraulic and earth engineering

Underground passageway, e.g., tunnel

Boring

33DIG21, 33286, 299 13, 356138, 356153, 405138, 405146, E21D 900, G01B 1127, E21B 4400

Patent

active

051564904

ABSTRACT:
A shield tunnelling apparatus is provided that includes a first tubular shield body in which a cutter assembly for excavation and a drive mechanism for driving the cutter assembly are disposed; a second shield body connected to the rear of the first shield body so as to have a common axis therewith; a target disposed in the first shield body so as to receive a light ray directed along the axis; first optical path changing means disposed in the second shield body and capable of changing the optical path of the light ray directed toward the target such that the light ray travels along an optical path displaced away from the axis; and second optical path changing means disposed in the second shield body and capable of changing the optical path of the light ray passing through the first optical path changing means such that the light ray is again directed along the axis.

REFERENCES:
patent: 3498673 (1970-03-01), Ledray et al.
patent: 3785738 (1974-01-01), Hoppke
patent: 3861803 (1975-01-01), Sallans
patent: 4027210 (1977-05-01), Weber
patent: 4311411 (1982-01-01), Akesaka et al.
patent: 4392744 (1983-07-01), Tatsuhama et al.
patent: 5085509 (1992-02-01), Gaffard et al.

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