Construction method of precast beam adjustable platform

The invention discloses a construction method of a precast beam adjustable platform and relates to the technical field of bridge construction. The construction method of the precast beam adjustable platform comprises the following steps of prefabricated platform base construction, sand box burying, support installation and steel plate pre-embedding, steel bar framework splicing, anchoring steel bar welding, formwork installation, concrete pouring and curing, sand box dismounting and final beam storage. By adopting the construction method of the precast beam adjustable platform, adjusting devices at two ends of the platform are dismantled before prestressed tendon stretch-drawing, beam ends are locally suspended, beam end corner chipping during prestressed tendon stretch-drawing is avoided,and the method is simple and convenient to operate, flexible and ingenious. During prestressed tendon stretch-drawing, supporting points at two ends are moved to the vicinity of hoisting holes, and the stability of beam bodi