Shield tunnel construction duct piece connecting structure

The utility model relates to the technical field of tunnel construction, and discloses a shield tunnel construction segment connecting structure which comprises at least one set of shield segments, every two adjacent sets of shield segments are connected through a double-end locking assembly, and each double-end locking assembly comprises a fixing block, a first positioning block and a second positioning block. The fixing block is installed on one set of shield segments through a second connecting rod, a second nut is further rotationally installed on the second connecting rod, a positioning groove used for installing a first positioning block and a second positioning block is further formed in the other set of shield segments, a first connecting rod is further installed on the second positioning block, and a second nut is further rotationally installed on the second connecting rod. A first nut is rotationally mounted on the first connecting rod; according to the utility model, the structure is novel, the ins