Tunnel excavator

Details Tunnel excavator Tunnel excavator

1975-03-18

1976-10-12

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

Stepper-type advance-causing means

61 85, 299 33, E21D 910, E21D 1136

Patent

active

039853900

ABSTRACT:
Tunnel excavator for forming an upper half annular hollow space in the solid earth. The excavator has an arch shaped shield provided with a plurality of chambers in which excavating machines are located. Each of the excavating machines is swingably supported in the respective chamber and gripper means for securely abutting against the outer and inner surfaces of the solid earth formed by the upper half annular hollow space is located in each of the chambers. Thrust generating means is connected between the respective excavating machines and the respective gripper means so that the excavating machines can be advanced by the action of the thrust generating means when the gripper means is actuated to abut against the earth.

REFERENCES:
patent: 3325217 (1967-06-01), Enz
patent: 3547493 (1970-12-01), Starkle
patent: 3840271 (1974-10-01), Sugden

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