Reinforcement cage main reinforcement positioning tool and using method thereof

The invention relates to a reinforcement cage main reinforcement positioning tool and a using method thereof.The positioning device comprises a main rod, an arc hook and a movable positioning piece, the positioning piece comprises a first positioning plate, a second positioning plate and a third positioning plate, and the first positioning plate, the second positioning plate and the third positioning plate are slidably connected with the main rod; the use method comprises the following steps: determining the distance between the main reinforcements of the reinforcement cage according to requirements; adjusting a positioning piece on the main rod; the first reinforcement cage main reinforcement is welded to the reinforcement cage stirrup, the third positioning plate is placed on the first reinforcement cage main reinforcement, and then the other reinforcement cage main reinforcements are placed on the positioning pieces correspondingly; the reinforcement cage main reinforcements and the reinforcement cage stir