| 摘要 |
PURPOSE:To permit dredging operations to be smoothly performed by regulating present line lengths by using outputs or addition-corrected line lengths obtained by a length comparison output unit to compare substraction-corrected line length with a head standard line length. CONSTITUTION:The vibration of hull is detected, and the detection signal is sent to a soil quality judger 21 to judge the quality of soil. When the soil is a hard one for example, switches 22 and 23 are closed to dotted line side, and the results of judgement are sent out to an addition arithmetic unit 24. In the unit 24, a line length DELTAL for correction is added to the present line length Lv of the bead line to increase the line length, and the line length is sent to a line winding/sending out arithmetic unit 28. In the unit 28, on the basis of the addition-corrected line length, the amount of sending out the winch of the head line is obtained and given to a winch drive controller 29. Also, when the soil is a soft one, the results of judgement are sent out to a substraction arithmetic unit 25.
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