Tunnel excavation apparatus
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United States of America Patent
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Jan 17, 1995
Grant Date -
N/A
app pub date -
Oct 8, 1992
filing date -
Feb 28, 1992
priority date (Note) -
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Abstract
A tunnel excavation apparatus comprises a frame mounted on crawler tracks and provided with pistons comprising stabilizer feet, a power unit, a working unit, and auxiliary movement and positioning services. The working unit is arranged on an arm mounted on one end of telescopic uprights, which are hinged at their other ends to the frame about an axis substantially parallel to the longitudinal direction of the machine, and consists of a rectilinear rigid structure, at the perimeter of which excavation tools are arranged on a chain, to circulate along the side and front of the structure. The tools are hinged to a caisson open on the side opposite the hinged side and provided with apparatus for conveying concrete into its interior.
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