Which is more economical, movable support system or bridge girder launcher?

Definition from ZZHZ company in China
Movable support system is a kind of construction machinery to install bridge girders by way of cast-in-place with its own formwork, supported by box girder.
Bridge girder launcher realizes bridge construction if the girder carrier transports the prefabricated concrete girder to the rear part of the launcher.
Difference between movable support system and bridge girder launcher

1. Without prefabricating concrete girder in the precast girder yard, the movable support system adopts cast-in-place and field maintenance. Averagely it finishes one piece of girder every 12 days. While for the bridge girder launcher, it needs to prefabricate concrete girder, then transport them to be installed on the bridge floor
2. The movable support system has a longer cycle to finish the project but with low investment and high benefit; the bridge girder launcher with a short completion time but high investment
3. With low investment and short preparation time, the movable support system can be fast put into use. While the bridge girder launcher needs a long time to prepare for other equipments such as girder carrier and gantry crane.
4. With less land occupation, the material cost of the movable support system is relatively low.
5. The movable support system is widely used in the mountain area that can not build large-sized precast girder yard, while the bridge girder launcher is popular in large-sized precast girder yard

To sum up, it depends on the practical situation. But generally, the movable support system is more economical and more suitable for constrictive economy environment at present and in the future.

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