Method and apparatus for modifying the cross-sectional profile of an adit, tunnel or the like
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United States of America Patent
Stats
-
Sep 29, 1987
Grant Date -
N/A
app pub date -
Feb 12, 1986
filing date -
Jun 12, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To modify a given profile of an adit, tunnel, gallery or the like, particularly a circular profile so as to give it the shape of a vault, a sequence of individual recesses are made in the longitudinal direction in the wall of the adit by a boring head advanced in the direction of its axis of rotation and transversely to the longitudinal direction of the adit. The recesses preferably overlap one another. Apparatus for implementing the method comprises a heading device for moving in the direction of the wall of the adit a boring head provided at its front end with tools.
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- Non-US Classification not provided for expired patents
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- Citation Ranking not provided for expired patents
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