Incremental launching construction method for three-main-truss rigid suspension cable stiffening continuous steel truss girder with stiffening chord

The invention provides an incremental launching construction method for a three-main-truss rigid suspension cable stiffening continuous steel truss girder with a stiffening chord. A multi-point synchronous incremental launching control system is used for completing incremental launching construction of the large-span rigid suspension cable stiffening continuous steel truss girder with the stiffening chord. The method is feasible to implement, safe and reliable and solves the technical problem that incremental launching of a large-span steel truss girder bridge with a stiffening chord is difficult in the construction process.