Beam-slab in-situ prefabricated installation system

The utility model belongs to a beam plate in-situ prefabrication installation system which comprises pier columns, high cover beams, box beams and gantry cranes, gantry crane foundations for the gantry cranes to run on are arranged on the ground outside the pier columns on the two side edges of a road in the longitudinal direction of the road, or the outer side portions of the high cover beams onthe two side edges of the road extend outwards by 1.1-1.7 m to form extension portions. The gantry crane runs on the gantry crane foundation, a prefabricated platform is arranged at the upper ends oftwo longitudinally adjacent high cover beams located between the gantry crane foundations, and steel pipe supporting columns are arranged at the lower end of the prefabricated platform at intervals. The existing structural form of the on-site terrain and the pier column can be fully utilized, beam and slab prefabrication and installation are carried out on site, cost is reduced, cost is saved, andconstruction safety risks