Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1990-06-26
1992-04-14
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
405146, 405138, 299 53, E21D 900
Patent
active
051042622
ABSTRACT:
Tunnel boring machine comprising a number of swingable arms (11,12,13,14) provided with boring tools (41,42,43,44) for the working of the tunnel wall outside its normal diameter. The arms may be swung outwardly into an active position or retracted into an inactive position. These tools may be independently actuated and facilitate the insertion of steel supporting arcs into the excavated area.
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patent: 4915453 (1990-04-01), Fikse
Astrand Nils M.
Forsberg Jan H.
Hartwig Carl S. M.
Atlas Copco Construction and Mining Technique AB
McBee J. Russell
Munson Eric Y.
Stone Mark P.
Taylor Dennis L.
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