Whenever Segmental Launching Gantry is use, efficiency is crucial. Huada Heavy Industry Launching Gantries are designed to save every single minute in the construction sequence. Motorized mechanisms are used for continuous self-launching, electric winches with motorized travelling wagons are used for segment lifting and transporting, Spreader Beam with 360° on plane rotating, vertical tilting and angle adjustment functions are provided. 

Overhead LG Innovations of Huada Heavy Industry:
◆Our glue-as-you-go procedure is a special erection method for glued span-by-span bridges. A stiff main girder allows limited pre-loading of the LG, avoiding time consuming double handling.
◆A symmetrical system allows turnaround of the LG without dismantling and re-erection. A special gantry crane, able to travel over hinges, combined with a 360 degree horizontal bearing on the bottom block, allows very flexible and smooth segment installation.
◆Tower elements placed below the support beams allow substantial changes in the longitudinal slope. This facilitates compensation or elevation differences between neighboring bridges and repositioning of the LG in a vertical direction by vertical climbing of the LG.
◆Easy extension of the support beam for overhead Launching Gantries makes sideways movement of the whole system to the neighboring bridge or over existing superstructures possible.

THE METHOD AND STEPS OF INSTALLATION
The Launching Gantry (Launching Crane) is the heavy duty hoisting equipment which requires very high safety. A little negligence maybe causes serious accident, therefore, the installation of Launching Gantry must be directed or installed by professional works, and the steps are following:
◆ Surveying positioning
◆ Paving rails
◆ Assemble two sides main girder symmetrically.
◆ Installing front and rear connecting frame
◆ Installing front, middle and rear legs
◆ Installing lifting trolley and auxiliary trolley
◆ Hydraulic system, electrical system, operating platform and plug in power
◆ Test run and commissioning.

Type selection design needs to provide the bridge design drawings and other technical requirements of client, including bottom bridge structure, upper girder design and site working environment, the main technique parameters needed to be clear:
1. Maximum segment beam lifting weight
2. Maximum suspension weight
3. Bridge span
4. Segmental block section size and lifting point position
5. Pier section size, height and bending bearing capacity
6. Deck longitudinal slope and transverse slope
7. Minimum curve
8. Type of beam feeding