PURPOSE: To rapidly and reliably control maintenance of the horizontal level of a body, by a method wherein a level difference between fixed points outputted from a hydraulic type relative setting gauge, located at each fixed point on the body, is detected to calculate a control amount by which the respective support legs are expanded and contracted.
CONSTITUTION: A sensitive head outputted from a setting gauge 21b is amplified by an amplifier 31, and a difference with a sensitive head outputted from a setting gauge 21a' is determined by an operational amplifier 32 to determine a control amount θ. A difference with a sensitived head outputted from a settling gauge 21c is determined by an operational amplifier 33 to determine a control amount . A difference with a sensitive head outputted from a settling gauge 21d' is determined by an operational amplifier 34 to determine a control amount α. The θ, , and α are converted into feedback signals from a rubble- mound leveling device, and by means of the signals, expansion and contraction of their respective support legs 12a, 12c, and 12d are controlled to maintain a horizontal cradle 11 in a horizontal state.
WAKI KENICHI
NAGAMINE MITSURU
DOBOKU SOKKI CENTER KK
| JPS58173223A | 1983-10-12 |
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