The position of the lap joint of the stressed steel bar should be correct. The joints are staggered from each other, the upper iron is in the middle, and the lower iron should be as far as possible at the support. Within the length of each lap joint, the area of the lapped steel should not exceed 1/4 of the total area of the steel in this length. All the joints of the reinforced steel bars and stirrups are fully bound, and no buckle is allowed.