FIELD: bridge building, erection of long-length span structures of bridges. SUBSTANCE: gear includes vertical hydraulic jacks mounted on sliding supports and horizontal hydraulic jacks coupled to sliding supports. Horizontal and vertical hydraulic jacks are equipped with sensors of movement of their rods and limit switches. Gear is also fitted with sensors of position of span structure, control unit and hydraulic synchronizer. Vertical hydraulic jacks lift span structure. Automatic check and correction of span structure are executed in process of lift if it deviates from norm. Vertical hydraulic jacks are switched off and horizontal ones are switched on by control unit by signal from limit switch when maximal specified height is reached. When rods of horizontal hydraulic jacks are extended completely limit switch and control unit send command to lower span structure. After this rods of horizontal hydraulic jacks are pulled in and gear is ready for execution of next cycle. EFFECT: enhanced functional reliability and stability of gear. 1 dwg
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