In light of the waterway condition of the Yangtze river in Chongqing , the steel pile positioning system for the self-propelled trailing grab dredger .The characteristics of moving ship ways by mooring line winch and steel pile positioning are com-pared with, and three positioning pile lifting gears analyzed numerically .The Changying 7 positioning system, which has the hy-draulic ring beam lifting equipment with four piles , is developed .It is shown that the four pile-hydraulic ring beam lifting gear is the advanced, efficient, accurate and reliable positioning system for the dipper (grab) dredgers used in the torrential waterway with pebble riverbed .%结合长江重庆主城区航道条件,设计开发自航钢耙抓斗挖泥船钢桩定位装置,比较分析锚缆定位绞车移船方式与钢桩定位移船方式的特点,对3种定位桩升降装置进行计算分析,确定"长鹰7"定位系统采用四桩-液压环梁升降装置型式,使用表明该装置是卵石河床急流航道铲斗(抓斗)挖泥船先进、高效、准确、可靠的定位系统.
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