Double girder overhead launching gantry just as the name suggests, is made up of two girders which are connected by connecting rod or transverse steel frame. Overhead crane is set on the main girder, mobile support legs at bottom part. The overhead launching gantry can be used to install highway concrete girders as well as railway concrete girders.
Double girder overhead launching gantry for highway and railway mainly includes main girder and auxiliary girder connected at front part of main girder and equipped with support leg, front and rear lifting trolleys are equipped on the upper part of main girder; front, rear support leg, cylinder for boundary beam, front and rear gearboxes connected with main girder by hanging wheel and roller on the bottom part, and upper and bottom support beam with rolling elements are set on the front gearbox, connected by center shaft.
Compared with other overhead launching gantries, double girder overhead launching gantry features light weight, short length, unnecessary layout of longitudinal moving rail, applicable for curved bridge with small radius and other advantages.