Tunnelling shields

Details Tunnelling shields Tunnelling shields

1974-09-13

1976-07-20

Taylor, Dennis L.

61 42, E01G 300

Patent

active

039699064

ABSTRACT:
A tunnelling shield has a rearward rotatable part having a spiral rearward end to engage a forward end of a spiral tunnel lining. A drive mechanism rotates the rearward shield part as further tunnel segments are laid one by one in the shield end against the previous segment to be erected. Rams advance the shield as the rearward end rotates to allow a newly erected segment to engage the tunnel wall.

REFERENCES:
patent: 770894 (1904-09-01), Dutton
patent: 1336789 (1920-04-01), Sheen
patent: 1624369 (1927-04-01), Serra
patent: 1881421 (1932-10-01), Coyle
patent: 2804754 (1957-09-01), Bridge
patent: 2895299 (1959-07-01), Washabaugh

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