Indeed, there are often two secondary beams evenly distributed in the span. But not according to the net span, but according to the axis span. If you don't look carefully, you will naturally be' a little confused'. Moreover, the original intention of the 1 clear distance mentioned in the specification is not the exact 0.333333Lo point, but should include its vicinity. The steel bar batching person should have a deep understanding of the spirit of the specification, not just the literal meaning of the provisions, in order to avoid steel bar blockage and be an expert!