The utility model discloses an auxiliary tool suitable for turning over a large
steel box girder, which is suitable for the
steel box girder with the web spacing smaller than the width of a
flange plate, and comprises a tool body, the outer side of the tool body is provided with an arc surface, and the inner side of the tool body is provided with a mounting cavity. The mounting cavity is provided with a first contact surface connected with the
flange plate, a second contact surface connected with the web plate and a clamping groove connected with the first contact surface and the second contact surface, and the clamping groove is matched with the extension section of the
flange plate. The
steel box girder turnover device is simple in structure, low in cost and convenient to use, and can change the
contact mode of the steel
box girder and the ground after being mounted on the steel
box girder, so that the previous air turnover operation can be changed into the turnover action that the whole steel
box girder rolls on the ground during hoisting operation, the
transportation capacity is saved, and the hoisting efficiency is improved. And the overturning operation can be realized by using the hoisting equipment with the hoisting
tonnage greater than half of the
dead weight of the steel box girder, so that the manufacturing difficulty and the manufacturing cost of the steel box girder are greatly reduced.