Abstract: The present application disclosures a double production line and a rapid prefabrication process of a segmental beam. The double production line including two production machine and a track system provided on the construction ground; the production machine includes a fixed end mold, two side molds, a bottom mold trolley, a middle internal mold trolley and two side internal mold trolley; two side molds are positioned on two sides of the fixed end mold respectively, the fixed end mold and two side molds together define a pouring position with an end opening, two openings of the pouring position are arranged facing each other; the track system includes a transverse track and a longitudinal track communicated with each other, two pouring positions are both positioned in the extension path of the transverse track, and the longitudinal track is positioned between two pouring positions.

Abstract: Disclosed is a three-wire lamp string in the technical field of colored lamps. The three-wire lamp string comprises three wires and a plurality of lamp beads, wherein the lamp beads are fixed to the three wires respectively, at least one chip is arranged in each lamp bead, and the two ends of each chip are connected with any two wires of the three wires. Lamp beads in various colors can be mounted, so that the displaying of colored lamps in various colors is achieved; by arranging the lamp beads in various colors in a crossed mode, the service types of the lamp beads in various colors are greatly broadened, and the displaying effect is good; meanwhile, compared with an existing four-wire lamp string, the three-wire lamp string of the invention is low in production cost, and the circuit failure rate is greatly decreased.