The construction technique of box girder precast segment assembling by short-line method has been applied abroad, while applied in China in recent years.

In this paper mainly analyzes and interpretes the construction method,process,procedure of segmental assembling of traveling trestle bridge fabrication machines.

Some construction technics of concrete beam bridges in segment installation have been discussed in this paper,combined with the construction of prestressed boxing bridges and the handling of the bridging machines in sifeng cloverleaf junction.