Bridge construction steel bar welding equipment

The bridge construction steel bar welding equipment comprises an operation table, a movable seat is slidably installed at the outer end of the operation table, a welding device is fixedly installed on the upper end face of the movable seat through an electric push rod, and limiting rotating seats which are symmetrically arranged are slidably installed on the two sides of the upper end face of the operation table; positioning fluted discs are rotationally installed on the inner end faces of the two limiting rotating seats correspondingly, a plurality of positioning tooth blocks matched with one another are clamped to the peripheries of the positioning fluted discs, connecting plates are fixedly installed on the front end faces of the positioning tooth blocks, positioning rings are installed on the inner sides of the connecting plates in an inserted mode, and the positioning rings are arranged on the inner end faces of the positioning fluted discs; a threaded sleeve matched with the first threaded rod in a thre