Process and apparatus for excavating tunnels
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United States of America Patent
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-
Oct 6, 1992
Grant Date -
N/A
app pub date -
May 7, 1991
filing date -
May 11, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A machine for consolidating the soil for underground drilling excavations by means of the technique of the protective umbrella comprises a frame or chassis mounted on ground engaging motor driven crawler tracks and is provided with pistons having stabilizing feet. A power unit, which works a rotary unit and auxiliary units, is used for moving and positioning the machine. A rotary unit is located on a boom mounted on one end of telescopic standards hinged to the other end of the frame, around an axis that is substantially parallel with respect to the longitudinal axis of the machine. The standards are fixed to step bearings that realize said hinge and that are able to pivot with a 180 degree angle under the action of an engine. Said bearings have cursors sliding along vertical slides of the frame.
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