Method and device for controlling the trajectory of a shield-type tunnelling machine
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United States of America Patent
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Feb 27, 1990
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N/A
app pub date -
Apr 18, 1988
filing date -
Apr 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method of controlling the trajectory of a shield-type tunnelling machine equipped with displacement control hydraulic rams (3), characterized in that, these rams being divided into at least three groups of rams (6A, 6B, 6C), the theoretical instantaneous flowrates of fluid to be applied to each of these groups are continuously determined (40) from the curvature characteristics and the overall rate of advance set point trajectory and these groups (7-26-27-28) are supplied with instantaneous flowrates, the values of which correspond to the theoretical values.
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