Truss mechanism

The utility model relates to a truss mechanism, and belongs to the technical field of road and bridge construction. The truss mechanism comprises tracks, a truss and a take-up assembly, the two ends of the truss are matched with the tracks respectively, the take-up assembly comprises a wire gathering groove and a take-up reel, the wire gathering groove is adjacent to one track, the wire gathering groove and the track are arranged side by side, the take-up reel is rotatably arranged on the truss and located above the wire gathering groove, a cable is laid in the wire gathering groove, and one end of the cable is wound around the take-up reel. According to the truss mechanism provided by the utility model, the truss can move along the track, the power supply box is connected with equipment on the truss through the cable, the redundant cable can be wound on the take-up reel, the cable can be timely collected or released by controlling the forward rotation and reverse rotation of the take-up reel, and the cable b