When butt joint is adopted, butt fasteners shall be staggered, and two adjacent longitudinal horizontal bar joints shall not be set at the same time or the same span; the staggered distance between two adjacent joints in the horizontal direction shall not be less than 500mm; the distance from the center of each joint to the nearest main node shall not be greater than 1/3 of the longitudinal distance.When lap is used, the lap length shall not be less than 1m, and 3 rotating fasteners shall be set at equal spacing to fix. The distance from the edge of the cover plate of the end fastener to the end of the lap longitudinal horizontal bar shall not be less than 100mm.