Railway Construction Machineton New Bridge Launching Gantry. The bridge erecting machine is mainlyposed of the main beam, guide beam, guide beam front leg, main beam front (middle) support, upper leg, contact frame, zero hour support, lifting crane, side beam hanger and the girder in automobile, hydraulic and electrical systems.Where, the main beam is...Dec 05, 2015 · To construct high speed railway bridge with design speed 300km/h, we have to learn how to produce concrete girders, Generally, there are two ways as below:. Full span girder prefabrication in the precast yard In the plain area, 900t double girder beam launcher could be used with tires girder carrier to install full span precast girders, rail mounted gantry crane or …This type Beam launcher machine is suitable for the construction of bridge for roads, railways and other bridge erection construction site. Its main function is to lift the prefabricated beams, then transported onto the prefabricated pier. It has big difference from the general cranes. It …Main features and advantages hide/show. The launching gantry is a special hoist equipment used for lifting the concrete girder on the high-speed railway construction. It can lift 900t precast concrete girder. It is very convenient to aplish the span-shifting from 32m to 24m when move the legs. Main Parameters hide/show. Item/ Data /Model.