PRECAST CONCRETE SEGMENT HAVING CONNECTING STRUCTURE USING STEEL DUCT, AND CONNECTING STRUCTURE THEREOF

A precast concrete segment having an assembly structure using a steel duct is provided to have sufficient shear resistance on a joint of precast concrete segments by making a steel duct function as a shear key on a joint of precast concrete segments. Disclosed is a precast concrete segment where a steel duct(1) is penetrated and buried for shear connection in the assembly direction of the segment. The steel duct is formed in a cylindrical steel pipe to penetrate a tension member to apply tensile force on the segment and composed of a tube expansion portion(11) at the bottom and a tapered tube compression portion(12) at the top to insert and couple the steel duct between two adjacent segments. The connecting and assembling structure of precast concrete segments is completed by inserting a tapered tube compression portion of a steel duct into a tube expansion portion of a steel duct buried under the segment.