Tunneling shield

Details Tunneling shield Tunneling shield

1974-12-09

1976-09-14

Shapiro, Jacob

Mining or in situ disintegration of hard material

Processes

Forming blocks

299 31, E21D 906

Patent

active

039799212

ABSTRACT:
A tunneling shield for shielding the area of a tunnel between first and second tunnel machine assemblies which are longitudinally, relative to the axis of the tunnel, movable relative to each other comprising a plurality of extendable and retractable support beams, the longitudinal axes of which are substantially parallel with the axis of the tunnel. The support beams may be disposed near the wall of the tunnel at circumferentially spaced intervals from each other an connected at each end to a first and second tunnel machine assembly by flexible joints. Each of the support beams may comprise first and second telescopically engagable members to effect extension and retraction of the support beams in response to relative movement between the first and second machine assemblies.

REFERENCES:
patent: 1554723 (1925-09-01), Hamilton
patent: 3306055 (1967-02-01), Tabor
patent: 3581507 (1971-06-01), Stevens
patent: 3650116 (1972-03-01), Cunningham
patent: 3903707 (1975-09-01), Folk

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