Inclined leg rigid frame bridge jacking device and construction method

The invention discloses a slant leg rigid frame bridge jacking device and a construction method, and relates to the technical field of bridge construction.The slant leg rigid frame bridge jacking device comprises the steps of construction operation platform building including bridge abutment counter-force base construction, vertical supporting beam installation, jacking base construction, sliding beam construction, vertical jack installation and horizontal jack installation; a displacement sensor is arranged at the corresponding position of the jacking bridge structure; the inclined legs are cut and separated, and the vertical jacks and the horizontal jacks are loaded and pressurized to design values in a graded mode; a vertical jack performs test jacking, after test jacking is finished, formal alternate jacking is performed, and the pressure of a horizontal jack is adjusted according to the horizontal displacement condition in the formal jacking process; after jacking is completed, part of the construction o