Construction method for ultra-wide section conversion beam steel engineering

The invention relates to a construction method for ultra-wide section conversion beam steel engineering. A plurality of lines of brace groups are adopted as temporary supporting structures; waist ribs, upper surface ribs, hoop ribs and lower surface ribs are sequentially erected on I-steel beams on the brace groups; and bound ultra-wide section conversion beam steels are downwardly put onto laid beam bottom boards through unloading the temporary supporting structures to finish construction of the ultra-wide section conversion beam steels engineering. The method has the advantages of simple technique, convenience for material taking, high recycling rate, low construction strength and difficulty, low construction cost, firmness in binding of ultra-wide section conversion beam steels, definite stress, safety and reliability.