The utility model relates to a stride a formula single rail roof beam, including track roof beam body, this internal at least one pre -stressed reinforcement that slowly bonds that is equipped with oftrack roof beam. The application stride a formula single rail roof beam, use the traditional post stretching prestressing force system of the prestressing force system that slowly bonds replacement to be applied to stride a formula single rail roof beam, the grout of traditional post stretching prestressing force system has been avoided, processes such as pre -buried corrugated pipe, the qualityproblems that lead to with this leakiness of avoiding being in the milk, the weakening effect in prestressed duct coupled beam body cross -section has been reduced, corrosion risk when having avoidedstrand prestressing force secondary / a lot of stretch -draw, stride a formula single rail roof beam's structural performance has been improved, this stride a formula single rail roof beam simple structure, the utility model discloses a lead wire device. The lead wire device comprises a drying machine (1), an oven (7) and a pedal (2) arranged between the drying machine (1) and the oven (7), firstguide wheels (3) are respectively arranged on the top and the bottom of the right side of the drying machine (1), the left and the right of the inner part of the pedal (2) are communicated, second guide wheels (4) are respectively arranged on two sides of the pedal, third guide wheels (5) are arranged on the left side of the oven (7), the number of the first guide wheels (3) at the bottom of the drying machine (1) is equal to that of the second guide wheels (4) on the left side of the pedal, and the number of the second guide wheels (4) on the right side of the pedal is equal to that of the third guide wheels. The beneficial effects of the lead wire device are that: lead wire distance of varnished wires is decreased, production efficiency of the varnished wires is improved, space is left for operation of a worker, and the lead wire device is simple in structure and easy to manufacture, and performances are good.