PURPOSE: A composite prestressed arch rigid-frame bridge construction method is provided to maximize structural efficiency by pre-flexing a girder and to easily plan a rigid-frame bridge. CONSTITUTION: A composite prestressed arch rigid-frame bridge construction method comprises: a step of constructing a base and a wall of the lower structure(S10); a step of producing a main girder frame by assembling a main girder and a horizontal girder which is fixed at an upper end of the wall(S20); a step of fixing the girder frame at the upper end of the wall(S30); a step of pouring and curing a upper slab to the upper side of the main girder(S40); and a step of embedding both sides by putting prestressed concrete inside a pipe, which is inserted at both sides of the main girder, before the upper slab is poured(S50). [Reference numerals] (S10) Foundation and wall construction step; (S20) Main girder manufacturing and main girder frame assembling step; (S30) Main girder frame fixing step; (S40) Upper slab placing step; (S50) PC-strand permanently tensioning step
