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By analyzing and summarizing the process and requirements of cross beam installation, an underwater three-direction positioning equipment is developed. Through three sets of hydraulic cylinders and MGE sliders combining hydraulic synchronizing lifting technique and computer communication technology, precise automatic positioning is achieved. The equipment can be used in positioning other similar large structures. © Zhang et al; Licensee Bentham Open. This is an open access article licenseddoi:10.2174/1874836801610010017 fatcat:jops4m2jwfg2lczgpwv74syi5m