The utility model relates to a tunnel lining construction technique neighborhood, for solve current protruding bar rust -resistant lose the persistence with high costs, rust -resistant that the device exists poor, can not prevent the scale to lose the scheduling problem, the utility model provides a rust -resistant device that loses of tunnel lining construction seam protruding bar, overlap complete piping system with overlapping in built -in reinforcing bar outlying including built -in reinforcing bar, it has cement mortar to pack between built -in reinforcing bar and the cover complete piping system, and built -in reinforcing bar includes from top to bottom overlap joint section reinforcing bar, protection segment reinforcing bar and implantation reinforcing bar three -section reinforcing bar, three -section reinforcing bar formula structure as an organic whole, protection segment reinforcing bar periphery is located including the cap that binds, overlap joint section sleeve pipe and the protection segment sleeve pipe that connect gradually, protection segment sleeve pipe from top to bottom to the cover complete piping system, and it is peripheral that overlap joint section reinforcing bar is located to overlap joint section sleeve pipe, and the top periphery of overlap joint section reinforcing bar is located to the cap that binds. The device's cement mortar can not strike the damage because of external force by sleeve pipe system protection to change original brushing mode but adopted and fill, guaranteed the density.